(19)
(11)EP 3 153 347 B1

(12)EUROPEAN PATENT SPECIFICATION

(45)Mention of the grant of the patent:
29.04.2020 Bulletin 2020/18

(21)Application number: 15802802.7

(22)Date of filing:  02.06.2015
(51)International Patent Classification (IPC): 
B60N 2/818(2018.01)
B60N 2/815(2018.01)
B60N 2/865(2018.01)
(86)International application number:
PCT/CN2015/080563
(87)International publication number:
WO 2015/184970 (10.12.2015 Gazette  2015/49)

(54)

NOVEL FOUR-DIRECTION HEADREST

NEUARTIGE QUADRODIREKTIONALE KOPFSTÜTZE

NOUVEL APPUI-TÊTE À QUATRE DIRECTIONS


(84)Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

(30)Priority: 03.06.2014 CN 201410243567

(43)Date of publication of application:
12.04.2017 Bulletin 2017/15

(73)Proprietor: Yanfeng Adient Seating Co. Ltd.
Kangqiao Industrial Zone, Pudong New Area Shanghai 201315 (CN)

(72)Inventors:
  • CAO, Yaowei
    Shanghai 200120 (CN)
  • LI, Biao
    Shanghai 200120 (CN)
  • ZHU, Min
    Shanghai 200120 (CN)
  • LI, Xia
    Shanghai 200120 (CN)
  • XU, Donghai
    Shanghai 200120 (CN)

(74)Representative: Schweiger, Martin 
Schweiger & Partners Intellectual Property Law Firm Elsenheimer Strasse 1
80687 München
80687 München (DE)


(56)References cited: : 
CN-A- 102 700 442
CN-A- 104 002 714
KR-B1- 101 010 896
US-A1- 2014 145 489
CN-A- 102 700 442
CN-Y- 201 268 246
US-A1- 2012 080 923
  
      
    Note: Within nine months from the publication of the mention of the grant of the European patent, any person may give notice to the European Patent Office of opposition to the European patent granted. Notice of opposition shall be filed in a written reasoned statement. It shall not be deemed to have been filed until the opposition fee has been paid. (Art. 99(1) European Patent Convention).


    Description

    Technical Field



    [0001] The invention relates to seat technology, and more particularly to a novel four-direction headrest.

    Background Art



    [0002] Currently, four direction or four-way (X and Z direction) headrests are mainly used in automotive front seats. As disclosed in the publication No. CN102700442, a car seat headrest with push-buttons capable of moving up and down and moving back and forth is complicated in unlocking way and the sliding form in the X-direction and Z-direction. A force compromise during the unlocking process is relatively severe, and the unlocking force is difficult to be controlled. Additionally, the prior four-way headrest housing is connected by use of the form of front and back or up and down clasping and screwing, so that the form of the clasp fitting results in poor strength, more assembly links, and lower reliability and efficiency. Moreover, the inserting bar of the prior four-way headrest is limited by the assembly and the fitting structure is also be limited to be open, thus, the way of slide fitting lacks diversity, and there is a problem of the fitting clearance. If the inserting bar of the headrest is divided into two inserting bars, a headrest twist problem occurs.

    [0003] Prior art document US-A-2014/145489 discloses an adjustable headrest. The headrest independently moves along the substantially vertical axes of the mounting rods in response to a first-applied substantially vertical force applied to the headrest when the button is simultaneously actuated. The headrest independently also moves along the substantially horizontal axis of the slide rail in response to a second-applied substantially horizontal force applied to the headrest when the button is simultaneously actuated.

    Summary of the Invention



    [0004] The technical problem to be solved by the invention is to provide a novel four-direction headrest which is simple in the way of unlocking and sliding in view of the deficiency of existing four-way headrests. The novel four-direction headrest can also improve the structures of the housing and inserting bar of the headrest.

    [0005] This object is solved by the subject matter of the independent claim. Advantageous further developments are provided by the respective dependent claims.

    [0006] The technical problem to be solved by the invention can be realized by the following technical scheme:
    A novel four-direction headrest comprising:

    A headrest housing having a button hole disposed at the lower part of one side wall of the headrest housing;

    A U-shaped headrest bar having an upper portion at a crossbar end of the U-shaped headrest bar, the upper portion of the U-shaped headrest bar being inserted into the headrest housing from a bottom of the headrest housing, the U-shaped headrest bar provided with a plurality of locking notch grooves spaced apart on the two vertical supporting bars, the axes of the locking notch grooves being parallel to the crossbar of the U-shaped headrest;

    A sliding sleeve disposed at a Z-direction sliding fixing socket on the two vertical supporting bars of the U-shaped headrest bar, the inner part of the Z-direction sliding fixing socket being hollow, and its axis being parallel to the crossbar of the U-shaped headrest and perpendicular to the forward and backward movement direction of the headrest, and comprising at least a first wall parallel to the crossbar of the U-shaped headrest bar, a tab projecting hole formed in the first wall;

    An unlocking mechanism bracket installed in the hollow of the Z-direction sliding fixing socket, the unlocking mechanism bracket provided with an unlocking steel wire inserting groove and a tab inserting blind hole, wherein the unlocking steel wire inserting groove and the tab inserting blind hole are interpenetrating, the axes of which are perpendicular to each other, the axis of the unlocking steel wire inserting groove and the axis of the tab inserting blind hole are all perpendicular to the forward and backward movement direction of the headrest, and the axis of the unlocking steel wire inserting groove is parallel to the crossbar of the U-shaped headrest bar, the axis of the tab insertion blind hole is parallel to the vertical support bars of the U-shaped headrest bar and the opening thereof butts and connects to the tab projecting hole of the Z-direction sliding fixing socket;

    A tab and a tab return spring slidably disposed in the tab insertion hole of the unlocking mechanism bracket, the tab comprising a tab tip projecting from an opening of the tab inserting blind hole and going through the tab projecting hole on the Z-direction sliding fixing socket, and the tab being provided with an unlocking notch groove, the unlocking notch groove corresponding to the unlocking steel wire inserting groove on the unlocking mechanism bracket, a groove bottom of the unlocking notch groove being an inclined wedge surface, one end of the tab return spring contacting the tab and the other end contacting a bottom surface of the tab inserting blind hole;

    An X-direction sliding fixing socket fixed on the first wall of the Z-direction sliding fixing socket, the inner part of the Z-direction sliding fixing socket being hollow, the axis of the X-direction sliding fixing socket and the axis of the Z-direction sliding fixing socket being perpendicular to each other and parallel to the frontward and backward movement direction of the headrest; the X-direction sliding fixing socket being open on both ends parallel to the frontward and backward movement direction of the headrest and having a second wall connected to the first wall of the Z-direction sliding fixing socket, the second wall being parallel to the axis of the X-direction sliding fixing socket, and a tab inserting hole formed in the second wall, the tab inserting hole butting and connecting to the tab projecting hole of the Z-direction sliding fixing socket, and the tab tip inserting through the tab projecting hole of the Z-direction sliding fixing socket into the hollow of the Z-direction sliding fixing socket;

    An X-direction sliding guide slidably inserted into the hollow of the X-direction sliding fixing socket, both ends of the X-direction sliding guide parallel to the forward and backward movement direction of the headrest respectively project through the openings on both ends of the X-direction sliding fixing socket parallel to the forward and backward movement direction of the headrest, wherein one end of the X-direction sliding guide parallel to the forward and backward movement direction of the headrest is securely connected with the headrest housing and comprises at least a first surface parallel to the second wall of the X-direction sliding fixing socket, a plurality of ratchet teeth disposed on the first surface, the ratchet teeth are engaged with the tab tip of the tab;

    An unlocking steel wire slidably disposed in the unlocking steel wire inserting groove of the unlocking mechanism bracket, an intermediate position of the unlocking steel wire having a curved portion which is capable of acting on an inclined wedge surface in the tab, both ends of the unlocking steel wire being slidable in and out through the locking notch grooves of the two vertical support bars of the U-shaped headrest bar, respectively;

    An unlocking button installed in the button hole on the headrest housing, the unlocking button acting on one end of the unlocking steel wire.



    [0007] In a preferred embodiment of the invention, the Z-direction sliding fixing socket is made of a rectangular tube, the rectangular tube is open on both ends, and the top surface of the rectangular tube forms the first wall; an upper U-shaped headrest bar through hole is respectively formed at each end of the top surface of the rectangular tube, and a lower U-shaped headrest bar through hole is respectively formed at each end of the bottom surface of the rectangular tube, the upper and lower U-shaped headrest bar through holes at the same end of the rectangular tube are coaxial and are inserted therein with a Z-direction sliding sleeve, and a straight groove is formed in the sleeve wall of each of the Z-direction sliding sleeve so as to allow the unlocking steel wire to pass through and to be embedded into the locking notch groove in the two vertical supporting bars of the U-shaped headrest bar; the two vertical supporting bars of the U-shaped headrest bar are respectively passed through two Z-direction sliding sleeves.

    [0008] In a preferred embodiment of the invention, the headrest housing is a plastic part and is prepared by a blow molding method or a hot-melt method.

    [0009] In a preferred embodiment of the invention, the Z-direction sliding fixing socket is integrally formed with the X-direction sliding fixing socket.

    [0010] In a preferred embodiment of the invention, the cross bar and the two vertical supporting bars of the U-shaped headrest bar are separately manufactured, and both ends of the cross bar are connected to the upper ends of the two supporting bars by riveting.

    [0011] In a preferred embodiment of the invention, an unlocking steel wire return spring inserting hole is provided at each end of the groove bottom of the unlocking steel wire inserting groove of the unlocking mechanism bracket, and an unlocking steel wire return spring is disposed in each unlocking steel wire return spring inserting hole, and the outer end of the unlocking steel wire return spring acts on the unlocking steel wire.

    [0012] In a preferred embodiment of the invention, a limiting guide boss is disposed on any inner groove wall of the unlocking steel wire inserting groove of the unlocking mechanism bracket, and the limiting guide boss limits and guides the curved portion of the unlocking steel wire.

    [0013] In a preferred embodiment of the invention, the curved portion has a triangular configuration with a first hypotenuse and a second hypotenuse, wherein the first hypotenuse acts on the inclined wedge surface of the unlocking notch groove of the tab; there are two limiting guide bosses, located on the outsides of the first hypotenuse and the second hypotenuse respectively.

    [0014] In a preferred embodiment of the invention, a cross bar portion perpendicular to the axis of the unlocking steel wire is disposed at one end of the unlocking steel wire, and the cross bar portion and the unlocking button interact with each other.

    [0015] In a preferred embodiment of the invention, the unlocking button includes an unlocking button cover, a button return member and an unlocking button member, and the unlocking button cover has an inner hole; the button return member and the unlocking button member are assembled in the inner hole, and an inner end of the unlocking button member penetrates an inner hole bottom of the unlocking button cover and acts on a cross bar portion of the unlocking steel wire; the button return member is disposed in the inner hole of the unlocking button member, one end which is in contact with the inner hole top of the unlocking button member and the other end is in contact with the inner hole bottom of the unlocking button cover.

    [0016] In a preferred embodiment of the invention, the Z-direction sliding fixing socket and the X-direction sliding fixing socket are made of a high-strength metal material.

    [0017] In a preferred embodiment of the invention, the rear tooth surface of the ratchet teeth on the first surface of the X-direction sliding guide is a helical tooth surface, and the front tooth surface is a flat surface; the front tab surface of the tab tip is a inclined surface and the rear tab surface is a flat surface;and in the locked state, the front tooth surface of the ratchet teeth comes into contact with the rear tab surface of the tab tip to prevent the X-direction sliding guide from moving forward; the X-direction sliding guide is capable of moving backward after the X-direction sliding guide is subjected to a backward force transmitted from the headrest housing.

    [0018] By adopting the above technical scheme, the invention has following advantages compared with the prior four-way headrests:
    1. 1. The use of a tab and an unlocking steel wire on the four-way headrest to lock and unlock on the X-direction and Z-direction makes the locking and unlocking mechanism simple, efficient and controllable;
    2. 2. The Z-direction sliding fixing socket and the X-direction sliding fixing socket are made of high-strength metal materials, and made into integral or detachable forms to ensure the headrest more secure and reliable in the crash process. Metal material bracket avoids the concern about the strength is not enough due to the simple and compact structure, the overall mechanism can be made simple, compact and lightweight to achieve the purpose of saving material and cost;
    3. 3. The headrest housing of the invention is plastic part and is prepared by a blow molding method or a hot-melt method, solving the defects of poor strength, more assembly links, and reliability and efficiency to be not high resulted from the form of front and back or up and down clasping and screwing to connect used by the prior four-way headrest housing, eliminating the security experiment risk for the form of clasping and screwing connection, improving the efficiency of the assembly, and the blow molding process makes the housing to be more integral strong and more secure; and
    4. 4. The headrest bar of the invention is riveted by using a cross bar and two supporting bars on the left and right to be riveted into an integral part, and the anti-strike strength can be increased while realizing the anti-twist, and the fitting sliding structure can be diverse.

    Brief Description of the Drawings



    [0019] 

    Figure 1 is a schematic exploded view of all the components of the novel four-direction headrest of the invention.

    Figure 2 is a schematic exploded view of the novel four-direction headrest assembly of the invention.

    Figure 3 is a schematic exploded view of the assembly of the Z-direction sliding fixing socket, the X-direction sliding fixing socket and the Z-direction sliding sleeve of the novel four-direction headrest of the invention.

    Figure 4 is a schematic view of the assembly of the Z-direction sliding fixing socket, the X-direction sliding fixing socket and the Z-direction sliding sleeve of the novel four-direction headrest of the invention.

    Figure 5 is a schematic exploded view of the integration of the Z-direction sliding fixing socket and the X-direction sliding fixing socket and the assembly with the Z-direction sliding sleeve of the novel four-direction headrest of the invention.

    Figure 6 is a schematic view of the integration of the Z-direction sliding fixing socket and the X-direction sliding fixing socket and the assembly with the Z-direction sliding sleeve of the novel four-direction headrest of the invention.

    Figure 7 is a schematic view of the sliding movement of the Z-direction sliding fixing socket on the U-shaped headrest bar of the novel four-direction headrest of the invention.

    Figure 8 is a schematic view of the sliding movement of the X-direction sliding guide of the novel four-direction headrest of the invention.

    Figure 9 is a schematic view of the structure of another U-shaped headrest bar of the novel four-direction headrest of the invention.

    Figure 10 is a schematic exploded view of the assembly of the unlocking mechanism bracket, the unlocking steel wire and the tab of the novel four-direction headrest of the invention.

    Figure 11 is a schematic view of the interaction of the inclined wedge surface of the tab with the curved portion in the unlocking steel wire of the novel four-direction headrest of the invention.

    Figure 12 is a schematic view of the assembly of the unlocking mechanism bracket, the unlocking steel wire and the tab and being in the locked state of the novel four-direction headrest of the invention.

    Figure 13 is a cross-sectional view taken along line A-A of Fig. 12.

    Figure 14 is a schematic view of the assembly of the unlocking mechanism bracket, the unlocking steel wire and the tab and being in the unlocked state of the novel four-direction headrest of the invention.

    Figure 15 is a cross-sectional view taken along the line B-B of Fig. 14.

    Figure 16 is a schematic exploded view of the structure of the unlocking button of the novel four-direction headrest of the invention.

    Figure 17 is a schematic view of the assembly of the unlocking button and being in the locked state of the novel four-direction headrest of the invention.

    Figure 18 is a cross-sectional view taken along the line C-C of Fig. 17.

    Figure 19 is a schematic view of the assembly of the unlocking button and being in the unlocked state of the novel four-direction headrest of the invention.

    Figure 20 is a cross-sectional view taken along the line D-D of Fig. 19.

    Figure 21 is a schematic view of the action between the unlocking button and the unlocking steel wire of the novel four-direction headrest of the invention.

    Figure 22 is a schematic view of a state in which the headrest housing is in the initial position of the novel four-direction headrest of the invention.

    Figure 23 is a schematic view of a state in which the headrest housing is in the foremost position of the novel four-direction headrest of the invention.

    Figure 24 is a schematic view of a state in which the headrest housing is in the uppermost position of the novel four-direction headrest of the invention.

    Figure 25 is a schematic view of a state of the X-direction sliding guide, the tab, the unlocking steel wire, the U-shaped headrest bar and the unlocking button when the headrest housing is in the initial position of the novel four-direction headrest of the invention.

    Figure 26 is an enlarged schematic view of I in Figure 25.

    Figure 27 is an enlarged schematic view of II in Figure 25.

    Figure 28 is a schematic view of the engagement between the X-direction sliding guide and the tab when the headrest housing is in the initial position of the novel four-direction headrest of the invention.

    Figure 29 is a schematic view of a state of the X-direction sliding guide, the tab, the unlocking steel wire, the U-shaped headrest bar and the unlocking button when the headrest housing is in the backmost position of the novel four-direction headrest of the invention.

    Figure 30 is an enlarged schematic view of I in Figure 29.

    Figure 31 is a schematic view of a state of the X-direction sliding guide, the tab, the unlocking steel wire, the U-shaped headrest bar and the unlocking button when the headrest housing is in the uppermost position of the novel four-direction headrest of the invention.

    Figure 32 is an enlarged schematic view of I in Figure 31.

    Figure 33 is a schematic view of the assembly of the vertical supporting bar of the U-shaped headrest bar, the Z-direction sliding sleeve and the unlocking steel wire when the novel four-direction headrest of the invention is in the locked state.

    Figure 34 is a schematic view of a state of the tab, the ratchet teeth on the bottom surface of the X-direction slide guide and the hypotenuse of the triangle in the unlocked steel wire when the novel four-direction headrest of the invention is in the locked state.

    Figure 35 is a schematic view of a state of the tab, the ratchet teeth on the bottom surface of the X-direction slide guide and the hypotenuse of the triangle in the unlocked steel wire when the novel four-direction headrest of the invention is in the unlocked state.


    Detailed Description of Preferred Embodiments



    [0020] The invention will now be further described in conjunction with the accompanying drawings and preferred embodiments.

    [0021] Referring to Figure 1 and Figure 2, a novel four-direction headrest comprises a headrest housing 100, a U-shaped headrest bar 200, a Z-direction sliding fixing socket 300, an X-direction sliding fixing socket (sleeve seat) 400, a tab 500, an unlocking steel wire 600, an unlocking button 700, an unlocking mechanism bracket 800, an X-direction sliding guide 900, and the like.

    [0022] The headrest housing 100 is a plastic part and is prepared by a blow molding method or a hot-melt method. The bottom of the headrest housing 100 is open to facilitate or accomodate the U-shaped headrest bar 200, the Z-direction sliding fixing socket 300, the X-direction sliding fixing socket 400, the tab 500, the unlocking steel wire 600, then unlocking button 700, the unlocking mechanism bracket 800, the X-direction sliding guide 900 and the like to be fitted into the headrest housing 100. Further, a button hole 111 is provided in the lower portion of a side wall 110 of the headrest housing 100 to facilitate the installation of the unlocking button 700.

    [0023] The U-shaped headrest bar 200 may be of unitary construction, as shown in Figure 1, with a cross bar 210 and two vertical supporting bars 220, which are integrally manufactured. A plurality of locking notch grooves 221 are separately formed on the two vertical supporting bars 220 and the axes of the locking notch grooves 221 are parallel to the axis of the cross bar 210 of the U-shaped headrest bar 200.The cross bar 210 and the two vertical supporting bars 220 of the U-shaped headrest bar 200 may certainly also be manufactured separately, and then both ends of the cross bar 210 and the upper ends of the two vertical supporting bars 220 are joined together by riveting (see Figure 9).

    [0024] The Z-direction sliding fixing socket 300 is made of a high-strength metal material such as a high-strength sheet, an aluminum sheet, or the like, or may be made of a rectangular metal tube. The rectangular tube is open on both ends, and an upper U-shaped headrest bar through hole 311, 312 is respectively formed at each of two ends of the top surface 310 of the rectangular tube, a lower U-shaped headrest bar through hole 321, 322 is respectively formed at each of two ends of the bottom surface 320 of the rectangular tube, the upper and lower U-shaped headrest bar through holes 311, 321 at the left end of the rectangular tube are coaxial, and the upper and lower U-shaped headrest bar through holes 312, 322 at the right end of the rectangular tube are coaxial. A tab projecting hole 313 is formed in the middle of the top surface 310, and the tab projecting hole 313 is a square hole.

    [0025] A straight groove 331 is formed in the sleeve walls of the two Z-direction sliding sleeves 330.

    [0026] The X-direction sliding fixing socket 400 is made of a high-strength metal material such as a high-strength sheet, an aluminum sheet, or the like, or may be made of a rectangular metal tube. The rectangular tube is open on both ends, and a tab inserting hole 411 is formed in the bottom surface 410 of the rectangular tube, the tab inserting hole 411 is a square hole, and its shape and size are matched with the tab projecting hole 313.

    [0027] The Z-direction sliding fixing socket 300 and the X-direction sliding fixing socket 400 may separately be manufactured and then soldered or welded together (as shown in Figure 3 and Figure 4), or may be integrally manufactured (as shown in Figure 5 and Figure 6).

    [0028] If the Z-direction sliding fixing socket 300 and the X-direction sliding fixing socket 400 are separately manufactured as shown in Figure 3 and Figure 4, it is necessary to solder the Z-direction sliding fixing socket 300 and the X-direction sliding fixing socket 400 together. While the solidering is done, the bottom surface 410 of the X-direction sliding fixing socket 400 is first stacked on the top surface 310 of the Z-direction sliding fixing socket 300, and the tab inserting hole 411 on the bottom surface 410 of the X-direction sliding fixing socket 400 is aligned with the tab projecting hole 313 on the top surface 310 of the Z-direction sliding fixing socket 300 while the axis of the X-direction sliding fixing socket 400 and the axis of the Z-direction sliding fixing socket 300 are perpendicular to each other, then the soldering is performed, and a X-direction and Z-direction adjustment bracket is formed after the soldering.

    [0029] Referring to Figures 10 to 15 in conjunction, the unlocking mechanism bracket 800 is generally a cuboid, on which an unlocking steel wire inserting groove 810 and a tab inserting blind hole 820 are provided, and the unlocking steel wire inserting groove 810 and the tab inserting blind hole 820 are interpenetrating, the axes of which are perpendicular to each other. Unlocking steel wire return spring inserting hole 830 is provided at each end of the groove bottom of the unlocking steel wire inserting groove 810, and the axis of the unlocking steel wire return spring inserting hole 830 and the axis of the unlocking steel wire inserting groove 810 are perpendicular to each other. Two limiting guide boss 840, 850 are disposed on the inner lower groove wall of the unlocking steel wire inserting groove 810 of the unlocking mechanism bracket 800.

    [0030] The top portion of the tab 500 has a tab tip 510, its lower portion has an unlocking notch groove 520, and the groove bottom surface of the unlocking notch groove 520 is an inclined wedge surface 521 having an extended surface intersecting an extension line of the axis of the tab 510.

    [0031] The middle portion of the unlocking steel wire 600 is folded into a triangular shape 610 with two hypotenuses 611, 612, and one end contacting the unlocking button 700 has a cross bar portion 620.

    [0032] Referring to Figures 16 to 20 in conjunction, the unlocking button 700 includes an unlocking button cover 710, a button return member 720 and an unlocking button member 730. The button return member 720 may be a spring or an elastic body. The unlocking button cover 710 has an inner hole 711, the button return member 720 and the unlocking button member 730 are assembled in the inner hole 711 of the unlocking button cover 710, and an inner end 731 of the unlocking button member 730 penetrates the bottom of the inner hole 711 of the unlocking button cover 710. The button return member 720 is disposed in the inner hole 732 of the unlocking button member 730, one end thereof is in contact with the top of the inner hole 732 of the unlocking button member 730, and the other end is in contact with the bottom of the inner hole 711 of the unlocking button cover 710. The two pawls 733 of the unlocking button member 730 penetrate the bottom of the inner hole 711 of the unlocking button cover 710 so as to hook on the bottom surface of the unlocking button cover 710.

    [0033] The X-direction sliding guide 900 is also generally a cuboid, and a plurality of ratchet teeth 911 are disposed on the bottom surface 910 thereof.

    [0034] The assembly method of the four-way headrest is as follows:

    Step 1: fit the tab 500 into the tab inserting blind hole 820 of the unlocking mechanism bracket 800 along with the tab return spring 530 in a manner that the tab tip 510 is directed upward. The upper end of the tab return spring 530 contacts the bottom surface of the tab 500, and the lower end of the tab return spring 530 contacts the bottom surface of the tab inserting blind hole 820 (see Figure 10 to Figure 15 in conjunction);

    Step 2: place two unlocking steel wire return springs 630 into the two unlocking steel wire return spring inserting holes 830 in the groove bottom of the unlocking steel wire inserting groove 810 of the unlocking mechanism bracket 800, and then insert the unlocking steel wire 600 into the unlocking steel wire inserting groove 810 of the unlocking mechanism bracket 800, and insert the triangle 610 in the middle of the unlocking steel wire 600 into the unlocking notch groove 520 of the tab 500 to contact the inclined wedge surface 521 of the unlocking notch groove 520; in the mean time, place the hypotenuse 611 of the triangular 610 of the unlocking steel wire 600 at the inner side of the limiting guide boss 840 in the unlocking steel wire inserting groove 810, and place the hypotenuse 612 of the triangular 610 of the unlocking steel wire 600 into the limiting guide boss 850 in the unlocking steel wire inserting groove 810. The unlocking steel wire 600 is restricted from exiting the unlocking steel wire inserting groove 810 by means of restricting the hypotenuses 611, 612 of the triangle 610 by limiting guide bosses 840, 850 (see Figure 10 to Figure 15 in conjunction);

    Step 3: insert the unlocking mechanism bracket 800 with the assembly of the tab 500 and the unlocking steel wire 600 into the Z-direction sliding fixing socket 300 from the opening at one end of the Z-direction sliding fixing socket 300, and adjust the position of the unlocking mechanism bracket 800 so as to insert the tab tip 510 of the tab 500 into the X-direction sliding fixing socket 400 through the tab projecting hole 313 on the top surface 310 of the Z-direction sliding fixing socket 300 and the tab inserting hole 411 on the bottom surface 410 of the X-direction sliding fixing socket 400;

    Step 4: insert two Z-direction sliding sleeves 330 into the upper and lower U-shaped headrest bar through holes 311, 321 on the left end of the Z-direction sliding fixing socket 300 and the upper and lower U-shaped headrest bar through holes 312, 322 on the right end of the Z-direction sliding fixing socket 300, respectively;

    Step 5: insert two vertical supporting bars 220 of the U-shaped headrest bar 200 through the two Z-direction sliding sleeves 330 from the top to the bottom, and align the straight grooves 331 on the two Z-direction sliding sleeves 330 with one of locking notch grooves 221 on the vertical supporting bars 220; and insert the unlocking steel wire 600 into the locking notch groove 221 on the vertical supporting bars 220 through the straight grooves 331 on the two Z-direction sliding sleeves 330 and the unlocking steel wire 600 is able to slide in and out;

    Step 6: insert the X-direction sliding guide 900 into the X-direction sliding fixing socket 400 from the opening at one end of the X-direction sliding fixing socket 400, and engage a ratchet teeth 911 on the bottom surface 910 of the X-direction sliding guide 900 with the tab tip 510, so that both ends of the X-direction sliding guide 900 respectively project through the openings at both ends of the X-direction sliding fixing socket 400;

    Step 7: insert the top end of the U-shaped headrest bar 200 to which the Z-direction sliding fixing socket 300, the X-direction sliding fixing socket 400, the tab 500, the unlocking steel wire 600, the unlocking mechanism bracket 800 and the X-direction sliding guide 900 are assembled into the headrest housing 100 from the bottom of the headrest housing 100, fixedly connect one end of the X-direction sliding guide 900 to the headrest housing 100, and oppose the cross bar portion 620 of one end of the unlocking steel wire 600 to the button hole 111 in the lower portion of the side wall 110 of the headrest housing 100;

    Step 8: install the unlocking button 700 into the button hole 111 and bring the inner end 731 in the unlocking button 700 into contact with the cross bar portion 620.



    [0035] After the entire four-way headrest is assembled, the axis of the Z-direction sliding fixing socket 300 is parallel to the cross bar 210 of the U-shaped headrest bar 200, perpendicular to the forward and backward movement direction of the headrest, and the axis of the unlocking steel wire inserting groove 810 and the axis of the tab inserting blind hole 820 are both perpendicular to the forward and backward movement direction of the headrest, while the axis of the unlocking steel wire inserting groove 810 is parallel to the cross bar 210 of the U-shaped headrest bar 200, the axis of the tab inserting blind hole 820 is parallel to the vertical supporting bar 220 of the U-shaped headrest bar 200; the axis of the X-direction sliding fixing socket 400 is parallel to the forward and backward movement direction of the headrest; the X-direction sliding guide 900 is parallel to the forward and backward movement direction of the headrest.

    [0036] Referring to Figures 7, 8, 14, 15 and 35 in conjunction, when the unlocking steel wire 600 is moved a distance along the axial direction thereof by the thrust F of the unlocking button (not shown), since the hypotenuse 611 of the triangular 610 on the unlocking steel wire 600 is counteracted by the inclined wedge surface 521 of the unlocking notch groove 520 in the tab 500, after overcoming the spring force of the two unlocking steel wire return springs 630, the unlocking steel wire 600 at the mean time is moved towards the deep of the unlocking steel wire inserting groove 810 of the unlocking mechanism bracket 800 so that the unlocking steel wire 600 slides out of the locking notch groove 221 on the vertical supporting bar 220 of the U-shaped headrest bar 200 and into the straight groove 331 of the Z-direction sliding sleeve 330, thus the unlocking between the unlocking mechanism bracket 800 and the U-shaped headrest bar 200 is achieved, in which case the two unlocking steel wire return springs 630 are compressed and accumulate energy. The hypotenuse 611 of the triangle 610 on the unlocking steel wire 600 will move from lower to higher position along the inclined wedge surface 521 of the unlocking notch groove 520 in the tab 500 so that the tab 500 is moved downward by means of the inclined wedge surface 521 after overcoming the spring force of the tab return spring 530. The tab tip 510 of the tab 500 is disengaged from the ratchet teeth 911 of the bottom surface 910 of the X-direction sliding guide 900 so that the unlocking between the X-direction sliding guide 900 and the Z-direction sliding fixing socket 300 is achieved, in which case the tab return spring 530 is compressed and accumulates energy.

    [0037] After unlocking and as shown in Figure 7, the four-way headrest can move on the Z-direction (not shown), that is, the height position of the four-way headrest can be adjusted, and the headrest housing (not shown) of the four-way headrest drives the Z-direction sliding fixing socket 300, the unlocking mechanism bracket 800, the tab 500 and the two Z-direction sliding sleeves 330 together to move upward and downward on the Z-direction along the two vertical supporting bars 220 of the U-shaped headrest bar 200 by use of the X-direction sliding guide 900 and the X-direction sliding fixing socket 400 fixedly connected thereto, such as move upward to the dotted line position in Figure 7, in which case the headrest is raised. When the headrest is raised to a designated position, the unlocking button (not shown) is released. Referring to Figures 12, 13 and 34, the unlocking steel wire 600 is moved towards the outside of the unlocking steel wire inserting groove 810 of the unlocking mechanism bracket 800 under the action of the two unlocking steel wire return springs 630. Because the hypotenuses 611, 612 of the triangle 610 in the middle of the unlocking steel wire 600 are limited by the two limiting guide bosses 840, 850 in the unlocking steel wire inserting groove 810 so as not to slide out of the unlocking steel wire inserting groove 810 entirely, thus the unlocking steel wire 600 exits the straight groove 331 of the Z-direction sliding sleeve 330 again and slides into the locking notch groove 221 of the vertical supporting bar 220 of the U-shaped headrest bar 200 (See Figure 33) to lock the unlocking mechanism bracket 800 and the U-shaped headrest bar 200. At the mean time, since the hypotenuse 611 of the triangle 610 on the unlocking steel wire 600 is moved from higher level to lower level along the inclined wedge surface 521 of the unlocking notch groove 520 in the tab 500, the tab 500 is moved upward under the action of the tab return spring 530 after losing the limitation of the hypotenuse 611 of the triangle 610 on the unlocking steel wire 600, and the tab tip 510 of the tab 500 engages with the ratchet teeth 911 of the bottom surface 910 of the X-direction sliding guide 900 again so that the locking between the X-direction sliding guide 900 and the Z-direction sliding fixing socket 300 is realized.

    [0038] After unlocking and as shown in Figure 8, the four-way headrest can move on the X-direction (not shown), the headrest housing (not shown) of the four-way headrest drives the X-direction sliding guide 900 fixedly connected thereto to move forward and backward on the axial direction of the X-direction sliding fixing socket 400, for example, the X-direction sliding guide 900 is moved to the dotted line position in Figure 8 to adjust the front and rear positions of the four-way headrest. When the headrest is moved forward to the designated position, the unlocking button (not shown) is released. Referring to Figures 12 and 13, the unlocking steel wire 600 is moved towards the outside of the unlocking steel wire inserting groove 810 of the unlocking mechanism bracket 800 under the action of the two unlocking steel wire return springs 630. Since the hypotenuses 611, 612 of the triangle 610 in the middle of the unlocking steel wire 600 are limited by the two limiting guide bosses 840, 850 in the unlocking steel wire inserting groove 810 so as not to slide out of the unlocking steel wire inserting groove 810 entirely, then the unlocking steel wire 600 slides into the locking notch groove 221 of the vertical supporting bar 220 of the U-shaped headrest bar 200 again, to lock the unlocking mechanism bracket 800 and the U-shaped headrest bar 200. At the mean time, since the hypotenuse 611 of the triangle 610 on the unlocking steel wire 600 is moved from higher position to lower position along the inclined wedge surface 521 of the unlocking notch groove 520 in the tab 500, the tab 500 is moved upward under the action of the tab return spring 530 after losing the limitation of the hypotenuse 611 of the triangle 610 on the unlocking steel wire 600, and the tab tip 510 of the tab 500 engages with the ratchet teeth 911 of the bottom surface 910 of the X-direction sliding guide 900 again so that the locking between the X-direction sliding guide 900 and the Z-direction sliding fixing socket 300 is realized.

    [0039] Referring to Figures 16 to 21, when unlocking, a force F is applied to the outer end of the unlocking button member 730 by the finger, and the unlocking button member 730 is moved towards the hole bottom of the inner hole 711 along the inner hole 711 of the unlocking button cover 710 after overcoming the resilience of the button return member 720; the inner end 731 of the unlocking button member 730 penetrates the hole bottom of the inner hole 711 of the unlocking button cover 711 and acts on a cross bar portion 620 of the unlocking steel wire 600 to push the unlocking steel wire 600 to achieve the above described unlocking action. When locking, the finger leaves the outer end of the unlocking button member 730, after the unlocking button member 730 lost the limitation, the unlocking button member 730 is moved away from the hole bottom of the inner hole 711 along the inner hole 711 of the unlocking button cover 710 under the action of the button return member 720, so that the inner end 731 of the unlocking button member 730 gradually retracts into the inner hole 711 of the unlocking button cover 710 and loses its effect or action on the crossbar portion 620 of the unlocking steel wire 600. The unlocking steel wire 600 effects the above described locking action under the action of the two unlocking steel wire return spring 630.

    [0040] Referring to Figures 22, 29 and 30, when the four-way headrest is in the lowermost and backmost position, the unlocking steel wire 600 falls into the lowermost one of the locking notch grooves 221 on the two vertical supporting bars 220 in the U-shaped headrest bar 200. The tab tip 510 of the tab 500 engages with the frontmost one of the ratchet teeth 911 of the bottom surface 910 of the X-direction sliding guide 900.

    [0041] Referring to Figures 23, 25 to 28, when the four-way headrest is in the lowermost and frontmost position, the unlocking steel wire 600 falls into the lowermost one of the locking notch grooves 221 on the two vertical supporting bars 220 in the U-shaped headrest bar 200. The tab tip 510 of the tab 500 engages with the backmost one of the ratchet teeth 911 of the bottom surface 910 of the X-direction sliding guide 900.

    [0042] Referring to Figure 24, when the four-way headrest is in the uppermost and backmost position, the unlocking steel wire 600 falls into the uppermost one of the locking notch grooves 221 on the two vertical supporting bars 220 in the U-shaped headrest bar 200. The tab tip 510 of the tab 500 engages with the frontmost one of the ratchet teeth 911 of the bottom surface 910 of the X-direction sliding guide 900.

    [0043] Referring to Figures 31 and 32, when the four-way headrest is in the uppermost and frontmost position, the unlocking steel wire 600 falls into the uppermost one of the locking notch grooves 221 on the two vertical supporting bars 220 in the U-shaped headrest bar 200. The tab tip 510 of the tab 500 engages with the backmost one of the ratchet teeth 911 of the bottom surface 910 of the X-direction sliding guide 900.

    [0044] Additionally, Referring to Figure 28, the rear tooth surface 911a of the ratchet teeth 911 of the bottom surface 910 of the X-direction sliding guide 900 is a helical tooth surface, and the front tooth surface 911b is a flat surface. The front tab surface 511 of the tab tip 510 is a bevel surface, and the rear tab surface 512 is a flat surface, so that the X-direction sliding guide 900 can not move forward because the rear tab surface 512 of the tab tip 510 and the front tooth surface 911b of the ratchet teeth 911 are in contact with each other in the locking state, but when subjected to a backward thrust, the X-direction sliding guide 900 can move backward. Therefore, when the four-way headrest is subjected to an impact, since the rear tooth face 911a of the ratchet teeth 911 is an helical tooth surface and the front tab surface 511 of the tab tip 510 is a bevel surface, the X-direction sliding guide 900 can move backward, so that the headrest housing (not shown) can retract to absorb the impact force to protect the head and neck of the occupant save.


    Claims

    1. A four-direction headrest comprising:

    a headrest housing (100) having a button hole (111) disposed at a lower part of one side wall (110) of the headrest housing (100);

    a U-shaped headrest bar (200) comprising a crossbar (210) and two vertical supporting bars (220), two ends of the crossbar (210) being respectively connected to upper ends of the vertical supporting bars (220), an upper portion of the U-shaped headrest bar (200) being inserted into the headrest housing (100) from a bottom of the headrest housing (100), the U-shaped headrest bar (200) provided with a plurality of locking notch grooves (221) spaced apart on the two vertical supporting bars (220), axes of the locking notch grooves (221) being parallel to the crossbar (210) of the U-shaped headrest;

    a Z-direction sliding fixing socket (300) comprising two sliding sleeves (330), the two vertical supporting bars (220) of the U-shaped headrest bar (200) being respectively passed through two sliding sleeves (330), wherein the sliding sleeves (330) are slidable on the vertical supporting bars (220) in a vertical direction, a rectangular tube being hollow and its axis being parallel to the crossbar (210) of the U-shaped headrest and perpendicular to a forward and backward movement direction of the headrest, wherein the forward and backward movement direction of the headrest is a X-direction that is perpendicular to a plane, wherein the crossbar (210) and the two vertical supporting bars (220) lie in the plane, the rectangular tube comprising at least a first wall parallel to the crossbar (210) of the U-shaped headrest bar (200), a tab projecting hole (313) formed in the first wall;

    an unlocking mechanism bracket (800) installed in the hollow of the rectangular tube, the unlocking mechanism bracket (800) provided with an unlocking steel wire inserting groove (810) and a tab inserting blind hole (820), wherein the unlocking steel wire inserting groove (810) and the tab inserting blind hole (820) are interpenetrating, their axes are perpendicular to each other, and the axis of the unlocking steel wire inserting groove (810) is parallel to the crossbar (210) of the U-shaped headrest bar (200), the axis of the tab inserting blind hole (820) is parallel to the vertical support bars (220) of the U-shaped headrest bar (200) and an opening thereof butts and connects to the tab projecting hole (313) of the Z-direction sliding fixing socket (300);

    a tab (500) and a tab return spring (530) slidably disposed in the tab inserting blind hole (820) of the unlocking mechanism bracket (800), the tab (500) comprising a tab tip (510) projecting from an opening of the tab inserting blind hole (820) and through the tab projecting hole (313) on the Z-direction sliding fixing socket (300), and the tab (500) being provided with an unlocking notch groove (520), the unlocking notch groove (520) corresponding to the unlocking steel wire inserting groove (810) on the unlocking mechanism bracket (800), a groove bottom of the unlocking notch groove (520) being an inclined wedge surface, one end of the tab return spring (530) contacting the tab (500) and the other end contacting a bottom surface of the tab inserting blind hole (820);

    an X-direction sliding fixing socket (400) fixed on the first wall of the Z-direction sliding fixing socket (300), an inner part of the X-direction sliding fixing socket (400) being hollow, an axis of the X-direction sliding fixing socket (400) being parallel to the frontward and backward movement direction of the headrest; the X-direction sliding fixing socket (400) comprising two ends that lie in a line that is parallel to the frontward and backward movement direction of the headrest and having a second wall connected to the first wall of the Z-direction sliding fixing socket (300), the second wall being parallel to the axis of the X-direction sliding fixing socket (400), and a tab inserting hole (411) formed in the second wall, the tab inserting hole (411) butting and connecting to the tab projecting hole (313) of the Z-direction sliding fixing socket (300), and the tab tip (510) inserting through the tab projecting hole (313) of the Z-direction sliding fixing socket (300) into the hollow of the X-direction sliding fixing socket (400);

    an X-direction sliding guide (900) slidably inserted into the hollow of the X-direction sliding fixing socket (400), both ends of the X-direction sliding guide (900) lie in a line that is parallel to the forward and backward movement direction of the headrest, the ends respectively project from openings on both ends of the X-direction sliding fixing socket (400), wherein one end of the X-direction sliding guide (900) is securely connected with the headrest housing (100) and comprises at least a first surface parallel to the second wall of the X-direction sliding fixing socket (400), a plurality of ratchet teeth (911) disposed on the first surface, the ratchet teeth (911) are engaged with the tab tip (510) of the tab (500);

    an unlocking steel wire (600) slidably disposed in the unlocking steel wire inserting groove (810) of the unlocking mechanism bracket (800), the unlocking steel wire (600) having a curved portion (610) which is capable of acting on an inclined wedge surface (521) in the tab (500), both ends of the unlocking steel wire (600) being slidable in and out through the locking notch grooves (221) of the two vertical support bars of the U-shaped headrest bar (200), respectively;

    an unlocking button (700) installed in the button hole (111) on the headrest housing (100), the unlocking button (700) acting on one end of the unlocking steel wire (600).


     
    2. The four-direction headrest of claim 1, wherein the rectangular tube is open on both ends, and the top surface of the rectangular tube forms the first wall, an upper U-shaped headrest bar through hole (311, 312) is respectively formed at each end of the top surface (310) of the rectangular tube, and a lower U-shaped headrest bar through hole (321, 322) is respectively formed at each end of the bottom surface (320) of the rectangular tube, the upper and lower U-shaped headrest bar through holes (321, 322; 311, 321) at the same end of the rectangular tube are coaxial and are inserted therein with the sliding sleeve (330), a straight groove (331) is formed in the sleeve wall of each of the sliding sleeve (330) so as to allow the unlocking steel wire (600) to pass through and to be embedded into the locking notch groove (221) in the two vertical supporting bars (220) of the U-shaped headrest bar (200).
     
    3. The four-direction headrest of claim 1, wherein the headrest housing (100) is a plastic part and is prepared by a blow molding method or a hot-melt method.
     
    4. The four-direction headrest of claim 1, wherein the Z-direction sliding fixing socket (300) is integrally formed with the X-direction sliding fixing socket (400).
     
    5. The four-direction headrest of claim 1, wherein the crossbar and the two vertical supporting bars (220) of the U-shaped headrest bar (200) are separately manufactured, and both ends of the crossbar are connected to the upper ends of the two supporting bars by riveting.
     
    6. The four-direction headrest of claim 1, wherein an unlocking steel wire return spring inserting hole (830) is provided at each end of the groove bottom of the unlocking steel wire inserting groove (810) of the unlocking mechanism bracket (800), and an unlocking steel wire return spring (630) is disposed in each unlocking steel wire return spring inserting hole (830), and the outer end of the unlocking steel wire return spring (630) acts on the unlocking steel wire (600).
     
    7. The four-direction headrest of claim 6, wherein a limiting guide boss (840, 850) is disposed on any inner groove wall of the unlocking steel wire inserting groove (810) of the unlocking mechanism bracket (800), and the limiting guide boss limits and guides the curved portion (610) of the unlocking steel wire (600).
     
    8. The four-direction headrest of claim 7, wherein the curved portion (610) has a triangular configuration with a first hypotenuse (611) and a second hypotenuse (612), wherein the first hypotenuse (611) acts on the inclined wedge surface of the unlocking notch groove (520) of the tab (500); there are two limiting guide bosses (840, 850), located on the outsides of the first hypotenuse (611) and the second hypotenuse (612) respectively.
     
    9. The four-direction headrest of claim 1, wherein a cross bar portion (620) perpendicular to the axis of the unlocking steel wire (600) is disposed at one end of the unlocking steel wire (600), and the cross bar portion (620) and the unlocking button (700) interact with each other.
     
    10. The four-direction headrest of claim 9, wherein the unlocking button (700) includes an unlocking button cover (710), a button return member (720) and an unlocking button member (730), the unlocking button cover (710) has an inner hole, the button return member (720) and the unlocking button member (730) are assembled in the inner hole, and an inner end of the unlocking button member (730) penetrates an inner hole bottom of the unlocking button cover (710) and acts on the cross bar portion (620) of the unlocking steel wire (600), the button return member (720) is disposed in the inner hole of the unlocking button member (730), one end thereof is in contact with the inner hole top of the unlocking button member (730) and the other end is in contact with the inner hole bottom of the unlocking button cover (710).
     
    11. The four-direction headrest of claim 1, wherein the Z-direction sliding fixing socket (300) and the X-direction sliding fixing socket (400) are made of a high-strength metal material.
     
    12. The four-direction headrest of claim 1, wherein a rear tooth surface (911a) of the ratchet teeth (911) on the first surface of the X-direction sliding guide (900) is a helical tooth surface and a front tooth surface (911b) is a flat surface, the front tab surface (511) of the tab tip (510) is a inclined surface and the rear tab surface (512) is a flat surface, and in the locked state, the front tooth surface (911b) of the ratchet teeth (911) comes into contact with the rear tab surface of the tab tip (510) and prevents the X-direction sliding guide (900) from moving forward, the X-direction sliding guide (900) is capable of moving backward after the X-direction sliding guide (900) is subjected to a backward force transmitted from the headrest housing (100).
     


    Ansprüche

    1. Vier-Richtungs-Kopfstütze, umfassend:

    ein Kopfstützengehäuse (100), das ein Knopfloch (111) aufweist, das an einem unteren Teil einer Seitenwand (110) des Kopfstützengehäuses (100) angeordnet ist;

    eine U-förmige Kopfstützenstange (200), die eine Querstange (210) und zwei vertikale Stützstangen (220) umfasst, wobei zwei Enden der Querstange (210) jeweils mit oberen Enden der vertikalen Stützstangen (220) verbunden sind, wobei ein oberer Bereich der U-förmigen Kopfstützenstange (200) in das Kopfstützengehäuse (100) von einem Boden des Kopfstützengehäuses (100) her eingeführt ist, wobei die U-förmige Kopfstützenstange (200) mit einer Vielzahl von Verriegelungs-Kerbnuten (221) versehen ist, die an den zwei vertikalen Stützstangen (220) voneinander beabstandet sind, wobei Achsen der Verriegelungs-Kerbnuten (221) parallel zu der Querstange (210) der U-förmigen Kopfstütze sind;

    einen Z-Richtungs-Gleit-Fixiersockel (300), die zwei Gleithülsen (330) umfasst, wobei die zwei vertikalen Stützstangen (220) der U-förmigen Kopfstützenstange (200) jeweils durch zwei Gleithülsen (330) hindurchgeführt sind, wobei die Gleithülsen (330) an den vertikalen Stützstangen (220) in einer vertikalen Richtung gleitbar sind, wobei ein rechteckiges Rohr hohl ist und dessen Achse parallel zu der Querstange (210) der U-förmigen Kopfstütze und senkrecht zu einer Vor- und Rückwärtsbewegungsrichtung der Kopfstütze ist, wobei die Vor- und Rückbewegungsrichtung der Kopfstütze eine X-Richtung ist, die senkrecht zu einer Ebene ist, wobei die Querstange (210) und die zwei vertikalen Stützstangen (220) in der Ebene liegen, wobei das rechteckige Rohr zumindest eine erste Wand umfasst, die parallel zu der Querstange (210) der U-förmigen Kopfstützenstange (200) ist, wobei ein Laschen-Vorstehungsloch (313) in der ersten Wand ausgebildet ist;

    eine Entriegelungsmechanismus-Klammer (800), die in der Höhlung des rechteckigen Rohrs installiert ist, wobei die Entriegelungsmechanismus-Klammer (800) mit einer Entriegelungs-Stahldraht-Einführungsnut (810) und einem Laschen-Einführungs-Sackloch (820) versehen ist, wobei die Entriegelungs-Stahldraht-Einführungsnut (810) und das Laschen-Einführungs-Sackloch (820) sich gegenseitig durchdringen, wobei deren Achsen senkrecht zueinander sind und die Achse der Entriegelungs-Stahldraht-Einführungsnut (810) parallel zu der Querstange (201) der U-förmigen Kopfstützenstange (200) ist, wobei die Achse des Laschen-Einführungs-Sacklochs (820) parallel zu den vertikalen Stützstangen (220) der U-förmigen Kopfstützenstange (200) ist und eine Öffnung davon das Laschen-Einführungsloch (313) des Z-Richtungs-Gleit-Fixiersockels (300) berührt und verbindet;

    eine Lasche (500) und eine Laschen-Rückstellfeder (530), die gleitbar in dem Laschen-Einführungs-Sackloch (820) der Entriegelungsmechanismus-Klammer (800) angeordnet sind, wobei die Lasche(500) eine Laschenspitze (510) umfasst, die von einer Öffnung des Laschen-Einführungs-Sacklochs (820) und durch das Laschen-Vorstehungsloch (313) an dem Z-Richtungs-Gleit-Fixiersockel (300) hervorsteht, und wobei die Lasche (500) mit einer Entriegelungs-Kerbnut (520) versehen ist, wobei die Entriegelungs-Kerbnut (520) zu der Entriegelungs-Stahldraht-Einführungsnut (810) an der Entriegelungsmechanismus-Klammer (800) korrespondiert, wobei ein Nutboden der Entriegelungs-Kerbnut (520) eine geneigte Keilfläche ist, wobei ein Ende der Laschen-Rückstellfeder (530) die Lasche (500) kontaktiert und das andere Ende eine Bodenfläche des Laschen-Einführungs-Sacklochs (820) kontaktiert;

    einen X-Richtungs-Gleit-Fixiersockel (400), der an der ersten Wand des Z-Richtungs-Gleit-Fixiersockels (300) fixiert ist, wobei ein innerer Teil des X-Richtungs-Gleit-Fixiersockels (400) hohl ist, wobei eine Achse des X-Richtungs-Gleit-Fixiersockels (400) parallel zu der Vorwärts- und Rückwärtsbewegungsrichtung der Kopfstütze ist; wobei der X-Richtungs-Gleit-Fixiersockel (400) zwei Enden umfasst, die in einer Linie liegen, die parallel zu der Vorwärts- und Rückwärtsbewegungsrichtung der Kopfstütze ist und eine zweite Wand aufweist, die mit der ersten Wand des Z-Richtungs-Gleit-Fixiersockels (300) verbunden ist, wobei die zweite Wand parallel zu der Achse des X-Richtungs-Gleit-Fixiersockels (400) ist, und wobei ein Laschen-Einführungsloch (411) in der zweiten Wand ausgebildet ist, wobei das Laschen-Einführungsloch das Laschen-Vorstehungsloch (313) des Z-Richtungs-Gleit-Fixiersockels (300) berührt und verbindet, und wobei die Laschenspitze (510) durch das Laschen-Vorstehungsloch (313) des Z-Richtungs-Gleit-Fixiersockels (300), in die Höhlung des X-Richtungs-Gleit-Fixiersockels (400) eingeführt ist;

    eine X-Richtungs-Gleitführung (900), die gleitbar in die Höhung des X-Richtungs-Gleit-Fixiersockels (400) eingeführt ist, wobei beide Enden der X-Richtungs-Gleitführung (900) in einer Linie liegen, die parallel zu der Vorwärts- und Rückwärtsbewegungsrichtung der Kopfstütze ist, wobei die Enden jeweils von Öffnungen an beiden Enden des X-Richtungs-Gleit-Fixiersockels (400) hervorstehen, wobei ein Ende der X-Richtungs-Gleitführung (900) sicher mit dem Kopfstützengehäuse verbunden ist und zumindest eine erste Fläche umfasst, die parallel zu der zweiten Wand des X-Richtungs-Gleit-Fixiersockels (400) ist, wobei eine Mehrzahl von Sperrklinken-Zähnen (911) an der ersten Fläche angeordnet sind, wobei die Sperrklinken-Zähne (911) mit der Laschenspitze (510) der Lasche (500) im Eingriff sind;

    einen Entriegelungs-Stahldraht (600), der gleitbar in der Entriegelungs-Stahldraht-Einführungsnut (810) der Entriegelungsmechanismus-Klammer (800) angeordnet ist, wobei der Entriegelungs-Stahldraht (600) einen gebogenen Bereich (610) aufweist, der in der Lage ist, auf eine geneigte Keilfläche (521) in der Lasche (500) zu wirken, wobei beide Enden des Entriegelungs-Stahldrahts (600) jeweils durch die Verriegelungs-Kerbnuten (221) der zwei vertikalen Stützstangen der U-förmigen Kopfstützenstange (200) hinein und hinausgleitbar sind;

    ein Entriegelungsknopf (700), der in dem Knopfloch (111) an dem Kopfstützengehäuse (100) installiert ist, wobei der Entriegelungsknopf (700) auf ein Ende des Entriegelungs-Stahldrahts (600) wirkt.


     
    2. Vier-Richtungs-Kopfstütze nach Anspruch 1, wobei das rechteckige Rohr an beiden Enden offen ist und wobei die obere Fläche des rechteckigen Rohrs die erste Wand ausbildet, wobei ein oberes U-förmiges Kopfstützenstangen-Durchgangsloch (311, 312) jeweils an jedem Ende der oberen Fläche (310) des rechteckigen Rohrs ausgebildet ist, und ein unteres U-förmiges Kopfstützenstangen-Durchgangsloch (321, 322) jeweils an jedem Ende der unteren Fläche (320) des rechteckigen Rohrs ausgebildet ist, wobei die oberen und unteren Kopfstützenstangen-Durchgangslöcher (321, 322; 311, 321)an dem gleichen Ende des rechteckigen Rohrs koaxial sind und darin mit der Gleithülse (330) eingeführt sind, wobei eine gerade Nut (331) in der Hülsenwand von jeder der Gleithülsen (330) ausgebildet ist, um dem Entriegelungs-Stahldraht (600) zu ermöglichen, durch die Verriegelungs-Kerbnut (221) in den zwei vertikalen Stützstangen (220) der U-förmigen Kopfstützenstange (200) hindurchzugehen und darin eingebettet zu sein.
     
    3. Vier-Richtungs-Kopfstütze nach Anspruch 1, wobei das Kopfstützengehäuse (100) ein Plastikteil ist und durch ein Blasform-Verfahren oder durch ein Heißschmelz-Verfahren hergestellt ist.
     
    4. Vier-Richtungs-Kopfstütze nach Anspruch 1, wobei der Z-Richtungs-Gleit-Fixiersockel (300) integral mit dem X-Richtungs-Gleit-Fixiersockel (400) ausgebildet ist.
     
    5. Vier-Richtungs-Kopfstütze nach Anspruch 1, wobei die Querstange und die zwei vertikalen Stützstangen (220) der U-förmigen Kopfstützenstange (200) separat hergestellt sind und beide Enden der Querstange mit den oberen Enden der zwei Stützstangen durch Vernieten verbunden sind.
     
    6. Vier-Richtungs-Kopfstütze nach Anspruch 1, wobei ein Entriegelungs-Stahldraht-Rückstellfeder-Einführungsloch (830) an jedem Ende des Nutbodens der Entriegelungs-Stahldraht-Einführungsnut (810) der Entriegelungsmechanismus-Klammer (800) vorgesehen ist und eine Entriegelungs-Stahldraht-Rückstellfeder (630) in jedem Entriegelungs-Stahldraht-Rückstellfeder-Einführungsloch (830) angeordnet ist und das äußere Ende der Entriegelungs-Stahldraht-Rückstellfeder (630) auf den Entriegelungs-Stahldraht (600) wirkt.
     
    7. Vier-Richtungs-Kopfstütze nach Anspruch 6, wobei eine Begrenzungs-Führungs-Erhebung (840, 850) an jeder inneren Nutwand der Entriegelungs-Stahldraht-Einführungsnut (810) der Entriegelungsmechanismus-Klammer (800) angeordnet ist und die Begrenzungs-Führungs-Erhebung den gebogenen Bereich (610) des Entriegelungs-Stahldrahts (600) begrenzt und führt.
     
    8. Vier-Richtungs-Kopfstütze nach Anspruch 7, wobei der gebogene Bereich (610) eine dreieckige Konfiguration mit einer ersten Hypotenuse (611) und einer zweiten Hypotenuse (612) aufweist, wobei die erste Hypotenuse (611) auf die geneigte Keilfläche der Entriegelungs-Kerbnut (520) der Lasche (500) wirkt; wobei es zwei Begrenzungs-Führungs-Erhebungen (840, 850) gibt, die jeweils an den Außenseiten der ersten Hypotenuse (611) und der zweiten Hypotenuse (612) angeordnet sind.
     
    9. Vier-Richtungs-Kopfstütze nach Anspruch 1, wobei ein Querstangenbereich (620) senkrecht zu der Achse des Entriegelungs-Stahldrahts (600) an einem Ende des Entriegelungs-Stahldrahts (600) angeordnet ist und der Querstangenbereich (620) und der Entriegelungsknopf (700) miteinander interagieren.
     
    10. Vier-Richtungs-Kopfstütze nach Anspruch 9, wobei der Entriegelungsknopf (700) eine Entriegelungsknopf-Abdeckung (710), ein Knopf-Rückstellelement (720) und ein Entriegelungsknopfelement (730) enthält, wobei die Entriegelungsknopf-Abdeckung (710) ein Innenloch aufweist, das Knopf-Rückstellelement (720) und das Entriegelungsknopfelement (730) in dem Innenloch eingebaut sind und ein inneres Ende des Entriegelungsknopfelements (730) einen Innenlochboden der Entriegelungsknopf-Abdeckung (710) durchdringt und auf den Querstangenbereich (620) des Entriegelungs-Stahldrahts (600) wirkt, wobei das Knopf-Rückstellelement (720) in dem Innenloch des Entriegelungsknopfelements (730) angeordnet ist, wobei ein Ende von diesem in Kontakt mit der Innenlochoberseite des Entriegelungsknopfelement (730) ist und das andere Ende in Kontakt mit dem Innenlochboden der Entriegelungsknopf-Abdeckung (710) ist.
     
    11. Vier-Richtungs-Kopfstütze nach Anspruch 1, wobei der Z-Richtungs-Gleit-Fixiersockel (300) und der X-Richtungs-Gleit-Fixiersockel (400) aus einem hochfesten Metallmaterial gefertigt sind.
     
    12. Vier-Richtungs-Kopfstütze nach Anspruch 1, wobei eine hintere Zahnfläche (911a) der Sperrklinken-Zähne (911) an der ersten Fläche der X-Richtungs-Gleitführung (900) eine schraubenförmige Zahnfläche ist und eine vordere Zahnfläche (911b) der der Sperrklinken-Zähne (911) eine flache Fläche ist, wobei die vordere Laschenfläche (511) der Laschenspitze (510) eine geneigte Fläche ist und die hintere Laschenfläche (512) eine flache Fläche ist und wobei in dem verriegelten Zustand die vordere Zahnfläche (911b) der Sperrklinken-Zähne (911) in Kontakt mit der hinteren Laschenfläche der Laschenspitze (510) kommt und verhindert, dass sich die X-Richtungs-Gleitführung (900) vorwärts bewegt, wobei die X-Richtungs-Gleitführung (900) in der Lage ist, sich rückwärts zu bewegen, nachdem die X-Richtungs-Gleitführung (900) einer Rückwärtskraft ausgesetzt ist, die von dem Kopfstützengehäuse (100) übertragen wird.
     


    Revendications

    1. Appuie-tête à quatre directions, comprenant :

    une boite d'appuie-tête (100) ayant un orifice de bouton (111) disposé à une partie inférieure d'une paroi latérale (110) de la boîte d'appuie-tête (100) ;

    une barre d'appuie-tête en forme de U (200) comprenant une barre transversale (210) et deux barres de support verticales (220), deux bouts de la barre transversale (210) étant respectivement connectées à des bouts supérieurs des barres de support verticales (220), une partie supérieure de la barre d'appuie-tête (200) étant insérée dans la boîte d'appuie-tête (100) d'un fond de la boîte d'appuie-tête (100), la barre d'appuie-tête en forme de U (200) étant pourvue d'une pluralité de rainures d'encoche de verrouillage (221) séparées sur les deux barres de support verticales (220), des axes des rainures d'encoche de verrouillage (221) étant parallèles à la barre transversale (210) de l'appuie-tête en forme de U (100) ;

    une douille de fixage glissante en direction Z (300) comprenant deux manches glissantes (330), les deux barres de support verticales (220) de la barre d'appuie-tête en forme de U (200) étant respectivement passées à travers deux manches glissantes (330), dans lequel les manches glissantes (330) sont glissantes sur les barres de support verticales (220) dans une direction verticale, un tube rectangulaire étant creux et dont l'axe est parallèle à la barre transversale (210) de l'appuie-tête en forme de U et perpendiculaire à une direction de mouvement de va-et-vient de l'appuie-tête, dans lequel la direction de mouvement de va-et-vient de l'appuie-tête est une direction X qui est perpendiculaire à un plan, dans lequel la barre transversale (210) et les deux barres de support verticales (220) sont situées dans le plan, le tube rectangulaire comprenant au moins une première paroi parallèle à la barre transversale (210) de la barre d'appuie-tête en forme de U (200), un trou à projection de bride (313) formé dans la première paroi ;

    un support de mécanisme de déverrouillage (800) installé dans le creux du tube rectangulaire, le support de mécanisme de déverrouillage (800) étant pourvu d'une rainure d'insertion de fil d'acier de déverrouillage (810) et un trou borgne d'insertion de bride (820), dans lequel la rainure d'insertion de fil d'acier de déverrouillage (810) et le trou borgne d'insertion de bride (820) s'interpénètrent, leurs axes étant perpendiculaires l'un vers l'autre et l'axe de la rainure d'insertion de fil d'acier de déverrouillage (810) est parallèle à la barre transversale (210) de la barre d'appuie-tête en forme de U (200), l'axe du trou borgne d'insertion de bride (820) est parallèle aux barres de support verticales (220) de la barre d'appuie-tête en forme de U (200) et une orifice de ceci touche et connecte le trou à projection de bride (313) de la douille de fixage glissante en direction Z (300) ;

    une bride (500) et un ressort de rappel de bride (530) disposés de manière glissante dans le trou borgne d'insertion de bride (820) du support de mécanisme de déverrouillage (800), la bride (500) comprenant une pointe de bride (510) projetant d'une ouverture du trou borgne d'insertion de bride (820) et à travers le trou à projection de bride (313) sur la douille de fixage glissante en direction Z (300), et la bride (500) étant pourvue avec une rainure d'encoche de déverrouillage (520) la rainure d'encoche de déverrouillage (520) correspondant à la rainure d'insertion de fil d'acier de déverrouillage (810) sur le support de mécanisme de déverrouillage (800), un fond de rainure d'encoche de déverrouillage (520) étant une surface de coin inclinée, un bout du ressort de rappel de bride (530) contactant la bride (500) et l'autre bout contactant une surface de fond du trou borgne d'insertion de bride (820) ;

    une douille de fixage glissante en direction X (400) fixée sur la première paroi de la douille de fixage glissante en direction Z (300), une partie intérieure de la douille de fixage glissante en direction X (400) étant creuse, un axe de la douille de fixage glissante en direction X (400) étant parallèle à la direction va-et-vient de l'appuie tête ; la douille de fixage glissante en direction X (400) comprenant deux bouts qui sont situés dans une ligne qui est parallèle à la direction va-et-vient de l'appuie tête, et ayant une seconde paroi connectée à la première paroi de la douille de fixage glissante en direction Z (300), la seconde paroi étant parallèle à l'axe de la douille de fixage glissante en direction X (400), et un trou d'insertion de bride (411) formé dans la seconde paroi, le trou d'insertion de bride (411) touchant et connectant au trou de projection de bride (313) de la douille de fixage glissante en direction Z (300), la pointe de bride (510) s'insérant à travers le trou de projection de bride (313) de la douille de fixage glissante en direction Z (300) dans le creux de la douille de fixage glissante en direction X (400) ;

    un guide glissant de direction X (900) insérée de manière glissante dans le creux de la douille de fixage glissante en direction X (400), tous les deux bouts du guide glissant de direction X (900) sont situés dans une ligne qui est parallèle à la direction va-et-vient de l'appuie-tête, les bouts projetant respectivement de l'orifices à les deux bouts de la douille de fixage glissante en direction X (400), dans lequel un des bouts du guide glissant de direction X (900) est connecté fermement avec la boîte d'appuie-tête (100) et comprend au moins une première surface parallèle à la seconde paroi de la douille de fixage glissante en direction X (400), une pluralité des dents de rochet (911) disposées sur la première surface, les dents de rochet (911) sont engagées avec la pointe de bride (510) de la bride (500) ;

    un fil d'acier de déverrouillage (600) disposé de manière glissante dans la rainure d'insertion de fil d'acier de déverrouillage (810) du support de mécanisme de déverrouillage (800), le fil d'acier de déverrouillage (600) ayant une section courbée (610) qui est capable d'actionner sur une surface de coin inclinée (521) dans la bride (500), les deux bouts du fil d'acier de déverrouillage (600) étant glissantes vers l'intérieur et vers l'extérieur à travers les rainures d'encoche de verrouillage (221) des deux barres de support verticales de la barre d'appuie-tête en forme de U (200), respectivement ;

    un bouton de déverrouillage (700) installé dans le trou de bouton (111) sur la boîte d'appuie-tête (100), le bouton de déverrouillage (700) actionnant sur un bout du fil d'acier de déverrouillage (600).


     
    2. Appuie-tête à quatre directions selon revendication 1, dans lequel le tube est ouvert à les deux bouts, et la surface supérieure de la tube rectangulaire forme la première paroi, un trou de passage supérieure d'appuie-tête en forme de U (311, 312) est respectivement formé à chaque bout de la surface supérieure (310) du tube rectangulaire, et un trou de passage inférieure d'appuie-tête en forme de U (321, 322) est respectivement formé à chaque bout de la surface de fond (320) du tube rectangulaire, les trous de passages supérieurs et inférieurs d'appuie-tête en forme de U (321, 322; 311, 321) au même bout du tube rectangulaire sont coaxiaux et sont insérés là-dedans avec les manches glissantes (330), une rainure droite (331) est formée dans la paroi de manche de chacune de la manche glissantes (330), ainsi permettant le fil d'acier de déverrouillage (600) de passer à travers et d'être incorporé dans la rainure d'encoche de verrouillage (221) dans les deux barres de support verticales (220) de la barre d'appuie-tête en forme de U (200).
     
    3. Appuie-tête à quatre directions selon revendication 1, dans lequel la boite d'appuie-tête (100) est une pièce en plastique qui est fabriquée par un procédé de moulage par soufflage ou un procédé de fusion à chaud.
     
    4. Appuie-tête à quatre directions selon revendication 1, dans lequel la douille de fixage glissante en direction Z (300) est formée intégralement avec la douille de fixage glissante en direction X (400).
     
    5. Appuie-tête à quatre directions selon revendication 1, dans lequel la barre transversale et les deux barres de support verticales (220) de la barre d'appuie-tête en forme de U (200) sont fabriqués séparément, et les deux bouts de la barre transversale sont connectés aux bouts supérieurs des deux barres de support par rivetage.
     
    6. Appuie-tête à quatre directions selon revendication 1, dans lequel un trous d'insertion de fil d'acier de déverrouillage (830) est pourvu à chaque bout du fond de rainure de la rainure d'insertion de fil d'acier de déverrouillage (810) du support de mécanisme de déverrouillage (800), et un ressort de rappel de fil d'acier de déverrouillage (630) est disposé dans chaque trou d'insertion de fil d'acier de déverrouillage (830), et le bout extérieur du ressort de rappel de fil d'acier de déverrouillage (630) actionne sur le fil d'acier de déverrouillage (600).
     
    7. Appuie-tête à quatre directions selon revendication 6, dans lequel un épaulement de guidage limitant (840, 850) est disposé sur quelconque des parois de rainure intérieures de la rainure d'insertion de fil d'acier de déverrouillage (810) du support de mécanisme de déverrouillage (800), et l'épaulement de guidage limitant limite et guide la section courbée (610) du fil d'acier de déverrouillage (600).
     
    8. Appuie-tête à quatre directions selon revendication 7, dans lequel la section courbée (610) a une configuration triangulaire avec une première hypoténuse (611) et une seconde hypoténuse (612), dans lequel la première hypoténuse (611) actionne sur la surface de coin inclinée de la rainure d'encoche de déverrouillage (520) de la bride (500) ; il y a deux épaulements de guidage limitant (840, 850), qui sont respectivement situés sur les côtés extérieurs de la première hypoténuse (611) et de la seconde hypoténuse (612).
     
    9. Appuie-tête à quatre directions selon revendication 1, dans lequel une partie de barre transversale (620) perpendiculaire à l'axe de fil d'acier de déverrouillage (600) est disposée à un bout du fil d'acier de déverrouillage (600), et la partie de barre transversale (620) et le bouton de déverrouillage (700) interagissent l'un avec l'autre.
     
    10. Appuie-tête à quatre directions selon revendication 9, dans lequel le bouton de déverrouillage (700) inclut un couvercle de déverrouillage (710), un élément de rappel de bouton (720) et un élément de bouton de déverrouillage (730), dans lequel le couvercle de déverrouillage (710) a un trou intérieur, l'élément de rappel de bouton (720) et l'élément de bouton de déverrouillage (730) sont assemblés dans le trou intérieur, et un bout intérieur d l'élément de bouton de déverrouillage (730) pénètre un fond de trou intérieur du couvercle de déverrouillage (710) et actionne sur la portion de barre transversale (620) du fils d'acier de déverrouillage (600), l'élément de rappel de bouton (720) est disposé dans le trou intérieur de l'élément de bouton de déverrouillage (730), un bout de ceci est en contact avec le sommet de trou intérieur de l'élément de bouton de déverrouillage (730) et l'autre bout est en contact avec le fond de trou intérieur du couvercle de déverrouillage (710).
     
    11. Appuie-tête à quatre directions selon revendication 1, dans lequel la douille de fixage glissante en direction Z (300) et la douille de fixage glissante en direction X (400) sont fabriquées d'un matériau de métal haute résistance.
     
    12. Appuie-tête à quatre directions selon revendication 1, dans lequel une surface de dent arrière (911a) des dents de rochet (911) sur la première surface du guide glissant de direction X (900) est une surface de dent hélicoïdale et une surface de dent frontale (911b) est une surface plate, la surface frontale de bride (511) de la pointe de bride (510) est une surface inclinée et la surface de bride arrière (512) est une surface plate, et, dans l'état verrouillé, la surface de dent frontale (911b) des dents de rochet (911) entre en contact avec la surface de bride arrière de la pointe de bride (510) et empêche que le guide glissant de direction X (900) se déplace en avant, le guide glissant de direction X (900) est capable de se déplacer en arrière après que le guide glissant de direction X (900) est soumis à une force arrière transmise par la boîte de l'appuie-tête (100).
     




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    Cited references

    REFERENCES CITED IN THE DESCRIPTION



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    Patent documents cited in the description