(19)
(11)EP 3 383 698 B1

(12)EUROPEAN PATENT SPECIFICATION

(45)Mention of the grant of the patent:
07.04.2021 Bulletin 2021/14

(21)Application number: 16823069.6

(22)Date of filing:  30.11.2016
(51)Int. Cl.: 
B60N 2/812  (2018.01)
B60N 2/885  (2018.01)
B64D 11/06  (2006.01)
B60N 2/865  (2018.01)
B60N 2/80  (2018.01)
(86)International application number:
PCT/US2016/064165
(87)International publication number:
WO 2017/095891 (08.06.2017 Gazette  2017/23)

(54)

FORWARD TRANSLATING HEADREST

VORWÄRTS ÜBERSETZENDE KOPFSTÜTZE

APPUI-TÊTE À TRANSLATION AVANT


(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: 30.11.2015 US 201562260946 P

(43)Date of publication of application:
10.10.2018 Bulletin 2018/41

(73)Proprietor: B/E Aerospace, Inc.
Wellington, FL 33414 (US)

(72)Inventors:
  • IOSSIFIDIS, John
    Miami, FL 33132 (US)
  • PEREZ, Moises
    Miami, FL 33143 (US)

(74)Representative: Algemeen Octrooi- en Merkenbureau B.V. 
P.O. Box 645
5600 AP Eindhoven
5600 AP Eindhoven (NL)


(56)References cited: : 
EP-A2- 2 631 116
WO-A1-2013/154269
US-A1- 2014 210 243
WO-A1-2013/081404
US-A1- 2014 001 811
  
      
    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


    [0001] The present invention relates generally to an adjustable forward translating headrest for a passenger seat, and more particularly, to a mechanically operated headrest configured with a ring brake mechanism providing infinite adjustability in the given amount of stroke.

    [0002] Passenger seats, such as airliner passenger seats, are typically configured with headrests to enhance safety and comfort. While most headrests are merely a fixed vertical extension of the seatback, and therefore lack independent adjustability, some seats are configured with headrests capable of adjusting relative to their supporting seatback.

    [0003] Adjustable headrests can be pivotally attached along a bottom edge thereof to a top edge of the seatback, thereby allowing the angle defined between the headrest and seatback to be changed. Adjustable headrests can also be configured to raise or lower relative to their supporting seatback to accommodate passengers of varying heights. In either adjustable headrest configuration, such headrest assemblies typically utilize one or more of buttons, levers, cabling and actuators for adjustment, each of which adds to seat complexity, weight, and cost.

    [0004] Document EP-A-2631116 discloses a forward translating headrest.

    [0005] Therefore, to provide headrest movement different from that of pivoting and vertically adjustable headrests, the present invention provides a forward translating headrest wherein horizontal movement is separate from rotational movement, when so equipped. The headrest assembly of the present invention further operates without buttons, levers, cabling and actuators, thereby providing a simple mechanical assembly in a compact package ideal for airliner applications.

    [0006] It is therefore an object of the invention to provide a forward translating headrest compatible with various seat designs, such as an airliner passenger seat.

    [0007] It is another object of the invention to provide a forward translating headrest equipped with a mechanical brake for locking a position of the headrest relative to a fixed base.

    [0008] It is a further object of the invention to provide a locking assembly for a seat headrest which can be reset manually by pulling on the headrest.

    [0009] To achieve the foregoing and other objects and advantages, the present invention provides a headrest assembly according to claim 1. The headrest assembly may further comprise at least one slide interconnecting the headrest plate and the headrest base, the at least one slide guiding headrest plate translation.

    [0010] In a further embodiment, the headrest can include left and right handles fixed to respective left and right sides of a front face of the headrest plate, the left handle extending laterally outward beyond and forward of the left side of the front face, and the right handle extending laterally outward beyond and forward of the right side of the front face.

    [0011] In a further embodiment, an inner diameter of the ring brake can be greater than an outer diameter of the shaft such that the ring brake can tilt relative to the shaft in a direction of the first magnet.

    [0012] In a further embodiment, the first reset plate can contact the ring brake to move the ring brake toward the second magnet when the headrest plate is farthest from the headrest base.

    [0013] In a further embodiment, the second reset plate can contact the ring brake to move the ring brake toward the first magnet when the headrest plate is nearest the headrest base.

    [0014] In a further embodiment, the ring brake can be an annular washer stack including a magnetic washer disposed between a pair of non-magnetic washers.

    [0015] In a further embodiment, the first reset plate can contact the housing when the headrest plate is farthest from the headrest base.

    [0016] In a further embodiment, the ring brake assembly can lock a position of the headrest plate relative to the headrest base, and wherein the headrest plate can be reset from a locked position by pulling the headrest plate fully apart from the headrest base thereby causing the first reset plate to push the ring brake towards the second magnet such that the second magnet magnetically retains the ring brake, which frees the shaft from the annular washer stack thereby allowing the headrest plate to be pushed fully toward the headrest base.

    [0017] In a further embodiment, the second reset plate can push the ring brake in a direction of the first magnet to be magnetically retained by the first magnet.

    [0018] In a further embodiment, the annular washer stack can be disposed between the spaced first and second magnets such that the first and second reset plates can push the ring brake in a direction of one of the first and second magnets to reset the ring brake assembly at both ends of the stroke to the free the shaft.

    [0019] In a further embodiment, the headrest base can be fixed atop a pair of spaced parallel posts adapted to be received in a top of a seat back of a passenger seat.

    [0020] Embodiments of the invention can include one or more or any combination of the above features and configurations.

    [0021] Additional features, aspects and advantages of the invention will be set forth in the detailed description which follows, and in part will be readily apparent to those skilled in the art from that description or recognized by practicing the invention as described herein. It is to be understood that both the foregoing general description and the following detailed description present various embodiments of the invention, and are intended to provide an overview or framework for understanding the nature and character of the invention as it is claimed. The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification.

    [0022] These and other features, aspects and advantages of the present invention are better understood when the following detailed description of the invention is read with reference to the accompanying drawings, in which:

    FIG. 1 is a front isometric view of a headrest assembly according to an embodiment of the invention;

    FIG. 2 is a right side view of the headrest assembly;

    FIG. 3 is a left side view of the headrest assembly;

    FIG. 4 shows forward headrest translation;

    FIG. 5 is a rear isometric view of the headrest assembly;

    FIG. 6 is a detailed view of the ring brake assembly of the headrest;

    FIG. 7 is a left side view of the headrest assembly showing the ring brake assembly in an open position;

    FIG. 8 is a detailed view of the ring brake assembly of FIG. 7;

    FIG. 9 is a rear isometric view of the headrest assembly showing the ring brake in a closed position; and

    FIG. 10 is a detailed view of the ring brake assembly shown in FIG. 9.



    [0023] The present invention will now be described more fully hereinafter with reference to the accompanying drawings in which exemplary embodiments of the invention are shown. However, the invention may be embodied in many different forms according to the amended set of claims but should not be construed as further limited to the representative embodiments set forth herein. The exemplary embodiments are provided so that this disclosure will be both thorough and complete, and will fully convey the scope of the invention and enable one of ordinary skill in the art to make, use and practice the invention. Like reference numbers refer to like elements throughout the various drawings.

    [0024] FIG. 1 shows a headrest assembly generally at reference numeral 20. The headrest assembly 20 generally includes a headrest plate 22 configured to translate, for example horizontally translate, relative to a headrest base 24 to adjust a distance of the headrest plate from the headrest base 24. The headrest base 24 is mounted atop a pair of spaced parallel posts 26 configured to be received within a seat back supporting the headrest assembly 20. The parallel posts 26 may be slidably disposed within the seat back such that the headrest assembly 20 can be raised or lowered relative to the seatback independent of the translational movement of the headrest plate 22. The headrest assembly 20 is compatible with a variety of seat types, such as an airliner passenger seat.

    [0025] The headrest plate 22 is generally planar and foraminous to save weight. Headrest handles 28 are attached along the left and right sides of the front face of the headrest plate 22, and are used to grab the headrest plate to slide the headrest plate forward or rearward to adjust the position of the headrest plate 22 relative to the headrest base 24. In one aspect, the headrest handles 28 can be padded and serve to center the head of the passenger on the headrest. As shown, the headrest handles 28 extend the full height of the headrest plate 22, outward beyond the left and right sides thereof, and forward of the front face of the headrest plate. Although not show, the headrest plate 22 is preferably padded and upholstered for comfort and aesthetics.

    [0026] FIG. 2 shows the headrest plate 22 slidably attached to the headrest base 24 by way of linear slides 30 capable of facilitating translation. A generally rectangular open-faced frame member 32 is attached to the rear face of the headrest plate 22. Each of the linear slides 30 includes a rail 34 attached to one side of the frame member 32 which is slidably disposed within a guide 36 attached to the headrest base 24. In this arrangement, the spaced linear slides 30 facilitate linear movement of the headrest plate 22 relative to the headrest base 24, while maintaining squarenesss throughout the range of motion of the headrest plate 22. As shown, the rails 34 can be oriented perpendicular to the parallel posts 26 such that headrest assembly movement relative to the seatback is perpendicular to headrest plate translating movement relative to the headrest base 24.

    [0027] FIG. 3 shows the headrest plate 22 in a fully stowed position nearest the headrest base 24. In a particular embodiment, the headrest plate 22 can directly contact a front face of the headrest base 24.

    [0028] FIG. 4 shows forward translation of the headrest plate 22 relative to the headrest base 24. In operation, the headrest handles 28 can be pulled to slide the headrest plate 22 forward to a desired locked position. Any position can be selected along the given stroke, wherein the stroke is determined by the length of a headrest shaft 38.

    [0029] FIGS. 5 and 6 show the headrest shaft 38 and ring brake assembly for locking the desired position of the headrest plate 22 relative to the headrest base 24. The ring brake assembly includes a ring brake 40 slidably disposed around the headrest shaft 38. In a particular embodiment, the ring brake 40 can be an annular washer stack including a magnetic washer 42 disposed between a pair of nonmagnetic washers 44. The inner diameter of the opening through the ring brake 40 is greater than the outer diameter of the headrest shaft 38, such that the ring brake 40 can change tilt relative to the shaft 38 to "open" and "close" the ring brake 40 to unlock or lock the shaft 38 along the stroke thereof.

    [0030] To reset the headrest plate 22 from a locked position along the stroke of the shaft 38, the headrest plate 22 is pulled fully forward to the end of the stroke such that the headrest plate 22 is farthest from the headrest base 24, thereby causing a first reset plate 46 mounted on an end of the headrest shaft 38 opposite the headrest plate 22 to push the ring brake 40 toward a first magnet 48 affixed to a housing 50 attached to the headrest base 24. The first magnet 48 magnetically retains the ring brake 40, which frees the headrest shaft 38 from the ring brake assembly thereby allowing the headrest plate 22 to be pushed fully in a direction of the headrest base 24 to fully stow the headrest plate 22, as shown in FIGS. 7 and 8.

    [0031] As shown in FIGS. 9 and 10, in the fully stowed position of the headrest plate 22, a second reset plate 52 affixed to or part of a backside of the headrest plate 22 pushes on the ring brake 40, thereby causing the ring brake 40 to be magnetically retained by a second magnet 54 mounted in the housing 50 spaced from the first magnet 48, thereby resetting the brake assembly. Once reset, the headrest plate 22 can be slid forward to be adjusted to a seat occupant's preference.

    [0032] The ring brake 40 is disposed spaced between the spaced first and second magnets 48, 54 such that the first and second reset plates 46, 52 can push the ring brake 40 in a direction of one of the first and second magnets 48, 54 to reset the ring brake 40 at both ends of the stroke to the free the shaft 38. When fully stowed, the headrest plate 22 can again be pulled forward, thereby tilting the ring brake 40 relative to the shaft 38 in a direction that locks the shaft 38, thereby locking the position of the headrest plate 22 relative to the headrest base 24. The headrest plate 22 can continue to be pulled forward and locked, but cannot be pushed rearward because of the tilt of the ring brake 40 in a direction of the first magnet 48 and engaging on the headrest shaft 38. The ring brake 40 and headrest shaft 38 arrangement thus allows for locking at any position along the length of the forward stroke (i.e., movement of the headrest plate 22 away from the headrest base 24), which can be adjusted by changing the length of the headrest shaft 38. A bottom portion of the ring brake 40 can also be biased as shown in FIG. 8 to hold the ring brake 40 perpendicular to the shaft 38 to allow unrestricted full return motion to the fully stowed position of the headrest plate 22.


    Claims

    1. A headrest assembly (20), comprising:

    a headrest base (24);

    a headrest plate (22) configured to translate relative to the headrest base (24);

    a shaft (38) fixed to the headrest plate (22) and slidably received in the headrest base (24), the shaft (38) having a length determining a stroke length of the headrest plate (22) relative to the headrest base (24); and

    a ring brake assembly configured to lock a position of the headrest plate (22) relative to the headrest base (24), characterized in that the ring brake assembly includes:

    i. a housing (50) fixed to the headrest base (24), the shaft (38) slidably received through the housing (50);

    ii. spaced first and second magnets (48, 54) mounted to the housing (50);

    iii. a ring brake (40) disposed between the first and second magnets (48, 54) and slidably disposed around the shaft (38);

    iv. a first reset plate (46) fixed to an end of the shaft (38) opposite the headrest plate (22); and

    v. a second reset plate (52) fixed to the headrest plate (22).


     
    2. A headrest assembly (20) according to claim 1, wherein
    the headrest base (24) is adapted to be positioned atop a seat back;
    the headrest plate (22) is positioned forward of the headrest base (24), the headrest plate (22) being configured to translate relative to the headrest base (24) to move the headrest plate (22) toward or apart from the headrest base (24);
    the headrest assembly (20) further comprising at least one slide (30) interconnecting the headrest plate (22) and the headrest base (24), the at least one slide (30) guiding headrest plate translation;
     
    3. The headrest assembly (20) according to claim 1, further comprising left and right handles (28) fixed to respective left and right sides of a front face of the headrest plate (22), the left handle extending laterally outward beyond and forward of the left side of the front face, and the right handle extending laterally outward beyond and forward of the right side of the front face.
     
    4. The headrest assembly (20) according to claim 1, 2 or 3, wherein an inner diameter of the ring brake (40) is greater than an outer diameter of the shaft (38) such that the ring brake (40) can tilt relative to the shaft (38) in a direction of the first magnet (48).
     
    5. The headrest assembly (20) according to any of claims 1-4, wherein the first reset plate (46) contacts the ring brake (40) to move the ring brake (40) toward the second magnet (54) when the headrest plate (22) is farthest from the headrest base (24).
     
    6. The headrest assembly (20) according to any of claims 1-5, wherein the second reset plate (52) contacts the ring brake (40) to move the ring brake (40) toward the first magnet (48) when the headrest plate (22) is nearest the headrest base (24).
     
    7. The headrest assembly (20) according to any of claims 1-6, wherein the ring brake (40) is an annular washer stack comprising a magnetic washer (42) disposed between a pair of non-magnetic washers (44).
     
    8. The headrest assembly (20) according to 1-7, wherein the first reset plate (46) contacts the housing (50) when the headrest plate (22) is farthest from the headrest base (24).
     
    9. The headrest assembly (20) according to any of claims 1-8, wherein the ring brake assembly locks a position of the headrest plate (22) relative to the headrest base (24), and wherein the headrest plate (22) is reset from a locked position by pulling the headrest plate (22) fully apart from the headrest base (24) thereby causing the first reset plate (46) to push the ring brake (40) toward the second magnet (54) such that the second magnet (54) magnetically retains the ring brake (40), which frees the shaft (38) from the ring brake (40) thereby allowing the headrest plate (22) to be pushed fully toward the headrest base (24).
     
    10. The headrest assembly (20) according to any of claims 1-93, wherein when the headrest plate (22) is nearest the headrest base (24), the second reset plate (52) pushes the ring brake (40) in a direction of the first magnet (48) to be magnetically retained by the first magnet (48).
     
    11. The headrest assembly (20) according to any of claims 1-10, wherein the ring brake (40) is disposed between the spaced first and second magnets (48, 54) such that the first and second reset plates (46, 52) can push the ring brake (40) in a direction of one of the first and second magnets (48, 54) to reset the ring brake assembly at both ends of the stroke to the free the shaft (38).
     
    12. The headrest assembly (20) according to any of claims 1-11, wherein the headrest base (24) is fixed atop a pair of spaced parallel posts (26) adapted to be received in a top of a seat back of a passenger seat.
     
    13. The headrest assembly (20) according to any of claims 3-12, wherein an inner diameter of the ring brake (40) is greater than an outer diameter of the shaft (38) such that the ring brake (40) can tilt relative to the shaft (38) in a direction of the first magnet (48) when the headrest plate (22) is nearest the headrest base (24), and is nearest the second magnet (54) when the headrest plate (22) is apart from the headrest base (24).
     


    Ansprüche

    1. Kopfstützenanordnung (20), umfassend:

    eine Kopfstützenbasis (24),

    eine Kopfstützenplatte (22), die zum Translatieren bezüglich der Kopfstützenbasis (24) ausgestaltet ist,

    einen Schaft (38), der an der Kopfstützenplatte (22) befestigt und verschiebbar in der Kopfstützenbasis (24) aufgenommen ist, wobei der Schaft (38) eine Länge hat, die die Hublänge der Kopfstützenplatte (22) bezüglich der Kopfstützenbasis (24) bestimmt, und

    eine Ringbremsenanordnung, die dazu ausgestaltet ist, eine Position der Kopfstützenplatte (22) bezüglich der Kopfstützenbasis (24) zu verriegeln, dadurch gekennzeichnet, dass die Ringbremsenanordnung Folgendes aufweist:

    i. ein an der Kopfstützenbasis (24) befestigtes Gehäuse (50), wobei der Schaft (38) verschiebbar durch das Gehäuse (50) aufgenommen ist,

    ii. einen ersten und einen zweiten Magneten (48, 54), die beabstandet und an dem Gehäuse (50) montiert sind,

    iii. eine zwischen dem ersten und dem zweiten Magneten (48, 54) angeordnete und verschiebbar um den Schaft (38) herum angeordnete Ringbremse (40),

    iv. eine erste Rückstellplatte (46), die an einem der Kopfstützenplatte (22) gegenüberliegenden Ende des Schafts (38) befestigt ist, und

    v. eine an der Kopfstützenplatte (22) befestigte zweite Rückstellplatte (52).


     
    2. Kopfstützenanordnung (20) nach Anspruch 1, wobei
    die Kopfstützenbasis (24) dazu ausgeführt ist, auf einer Sitzrückenlehne positioniert zu werden,
    die Kopfstützenplatte (22) vor der Kopfstützenbasis (24) positioniert ist, wobei die Kopfstützenplatte (22) dazu ausgestaltet ist, bezüglich der Kopfstützenbasis (24) zu translatieren, um die Kopfstützenplatte (22) zu der Kopfstützenbasis (24) hin oder von dieser weg zu bewegen,
    wobei die Kopfstützenanordnung (20) ferner mindestens einen Schieber (30) umfasst, der die Kopfstützenplatte (22) und die Kopfstützenbasis (24) miteinander verbindet, wobei der mindestens eine Schieber (30) die Translation der Kopfstützenplatte führt.
     
    3. Kopfstützenanordnung (20) nach Anspruch 1, ferner umfassend einen linken und einen rechten Griff (28), die an der linken bzw. rechten Seite einer Vorderfläche der Kopfstützenplatte (22) befestigt sind, wobei sich der linke Griff seitlich nach außen über die linke Seite der Vorderfläche hinaus und nach vorne erstreckt und sich der rechte Griff seitlich nach außen über die rechte Seite der Vorderfläche hinaus und nach vorne erstreckt.
     
    4. Kopfstützenanordnung (20) nach Anspruch 1, 2 oder 3, wobei ein innerer Durchmesser der Ringbremse (40) größer als ein äußerer Durchmesser des Schafts (38) ist, so dass die Ringbremse (40) bezüglich des Schafts (38) in eine Richtung des ersten Magneten (48) kippen kann.
     
    5. Kopfstützenanordnung (20) nach einem der Ansprüche 1 - 4, wobei die erste Rückstellplatte (46) die Ringbremse (40) kontaktiert, um die Ringbremse (40) zu dem zweiten Magneten (54) hin zu bewegen, wenn die Kopfstützenplatte (22) am weitesten von der Kopfstützenbasis (24) entfernt ist.
     
    6. Kopfstützenanordnung (20) nach einem der Ansprüche 1 - 5, wobei die zweite Rückstellplatte (52) die Ringbremse (40) kontaktiert, um die Ringbremse (40) zu dem ersten Magneten (48) hin zu bewegen, wenn die Kopfstützenplatte (22) der Kopfstützenbasis (24) am nächsten liegt.
     
    7. Kopfstützenanordnung (20) nach einem der Ansprüche 1 - 6, wobei die Ringbremse (40) ein ringförmiger Unterlegscheibenstapel ist, der eine magnetische Unterlegscheibe (42) umfasst, die zwischen einem Paar nicht magnetischer Unterlegscheiben (44) angeordnet ist.
     
    8. Kopfstützenanordnung (20) nach 1 - 7, wobei die erste Rückstellplatte (46) das Gehäuse (50) kontaktiert, wenn die Kopfstützenplatte (22) am weitesten von der Kopfstützenbasis (24) entfernt ist.
     
    9. Kopfstützenanordnung (20) nach einem der Ansprüche 1 - 8, wobei die Ringbremsenanordnung eine Position der Kopfstützenplatte (22) bezüglich der Kopfstützenbasis (24) verriegelt und wobei die Kopfstützenplatte (22) von einer verriegelten Position rückgestellt wird, indem die Kopfstützenplatte (22) vollständig von der Kopfstützenbasis (24) weggezogen wird, wodurch veranlasst wird, dass die erste Rückstellplatte (46) die Ringbremse (40) zu dem zweiten Magneten (54) hin schiebt, so dass der zweite Magnet (54) die Ringbremse (40) magnetisch festhält, wodurch der Schaft (38) von der Ringbremse (40) freigestellt wird, wodurch die Kopfstützenplatte (22) vollständig zu der Kopfstützenbasis (24) hin geschoben werden kann.
     
    10. Kopfstützenanordnung (20) nach einem der Ansprüche 1 - 9, wobei, wenn die Kopfstützenplatte (22) der Kopfstützenbasis (24) am nächsten liegt, die zweite Rückstellplatte (52) die Ringbremse (40) in die Richtung des ersten Magneten (48) schiebt, um magnetisch von dem ersten Magneten (48) festgehalten zu werden.
     
    11. Kopfstützenanordnung (20) nach einem der Ansprüche 1 - 10, wobei die Ringbremse (40) zwischen dem beabstandeten ersten und zweiten Magneten (48, 54) angeordnet ist, so dass die erste und die zweite Rückstellplatte (46, 52) die Ringbremse (40) in die Richtung des ersten oder des zweiten Magneten (48, 53) schieben können, um die Ringbremsenanordnung an beiden Enden des Hubs rückzustellen zu dem freien des Schafts (38).
     
    12. Kopfstützenanordnung (20) nach einem der Ansprüche 1 - 11, wobei die Kopfstützenbasis (24) auf einem Paar beabstandete parallele Pfosten (26) befestigt ist, die zur Aufnahme in einer Oberseite einer Sitzrückenlehne eines Passagiersitzes ausgeführt sind.
     
    13. Kopfstützenanordnung (20) nach einem der Ansprüche 3 - 12, wobei ein innerer Durchmesser der Ringbremse (40) größer als ein äußerer Durchmesser des Schafts (38) ist, so dass die Ringbremse (40) bezüglich des Schafts (38) in eine Richtung des ersten Magneten (48) kippen kann, wenn die Kopfstützenplatte (22) der Kopfstützenbasis (24) am nächsten liegt, und dem zweiten Magneten (54) am nächsten liegt, wenn die Kopfstützenplatte (22) von der Kopfstützenbasis (24) getrennt ist.
     


    Revendications

    1. Ensemble appui-tête (20), comprenant :

    une base d'appui-tête (24) ;

    une plaque d'appui-tête (22) configurée pour effectuer une translation par rapport à la base d'appui-tête (24) ;

    un arbre (38) fixé à la plaque d'appui-tête (22) et reçu en coulissement dans la base d'appui-tête (24), l'arbre (38) ayant une longueur déterminant une longueur de course de la plaque d'appui-tête (22) par rapport à la base d'appui-tête (24) ; et

    un ensemble de frein annulaire configuré pour bloquer une position de la plaque d'appui-tête (22) par rapport à la base d'appui-tête (24), caractérisé en ce que l'ensemble de frein annulaire comporte :

    i. un boîtier (50) fixé à la base d'appui-tête (24), l'arbre (38) étant reçu en coulissement à travers le boîtier (50) ;

    ii. des premier et deuxième aimants espacés (48, 54) montés sur le boîtier (50) ;

    iii. un frein annulaire (40) disposé entre les premier et deuxième aimants (48, 54) et disposé en coulissement autour de l'arbre (38) ;

    iv. une première plaque de réinitialisation (46) fixée à une extrémité de l'arbre (38) opposé à la plaque d'appui-tête (22) ; et

    v. une deuxième plaque de réinitialisation (52) fixée à la plaque d'appui-tête (22).


     
    2. Ensemble appui-tête (20) selon la revendication 1, dans lequel
    la base d'appui-tête (24) est adaptée pour être positionnée au sommet d'un dossier de siège ;
    la plaque d'appui-tête (22) est positionnée en avant de la base d'appui-tête (24), la plaque d'appui-tête (22) étant configurée pour effectuer une translation par rapport à la base d'appui-tête (24) pour déplacer la plaque d'appui-tête (22) vers ou à l'écart de la base d'appui-tête (24) ;
    l'ensemble appui-tête (20) comprenant en outre au moins une glissière (30) reliant la plaque d'appui-tête (22) et la base d'appui-tête (24), l'au moins une glissière (30) guidant une translation de plaque d'appui-tête.
     
    3. Ensemble appui-tête (20) selon la revendication 1, comprenant en outre des poignées gauche et droite (28) fixées sur des côtés gauche et droit respectifs d'une face avant de la plaque d'appui-tête (22), la poignée gauche s'étendant latéralement vers l'extérieur au-delà et vers l'avant du côté gauche de la face avant, et la poignée droite s'étendant latéralement vers l'extérieur au-delà et vers l'avant du côté droit de la face avant.
     
    4. Ensemble appui-tête (20) selon la revendication 1, 2 ou 3, dans lequel un diamètre interne du frein annulaire (40) est supérieur à un diamètre externe de l'arbre (38) de sorte que le frein annulaire (40) puisse s'incliner par rapport à l'arbre (38) dans une direction du premier aimant (48).
     
    5. Ensemble appui-tête (20) selon l'une des revendications 1 à 4, dans lequel la première plaque de réinitialisation (46) entre en contact avec le frein annulaire (40) pour déplacer le frein annulaire (40) vers le deuxième aimant (54) lorsque la plaque d'appui-tête (22) est la plus éloignée de la base d'appui-tête (24).
     
    6. Ensemble appui-tête (20) selon l'une des revendications 1 à 5, dans lequel la deuxième plaque de réinitialisation (52) entre en contact avec le frein annulaire (40) pour déplacer le frein annulaire (40) vers le premier aimant (48) lorsque la plaque d'appui-tête (22) est la plus proche de la base d'appui-tête (24).
     
    7. Ensemble appui-tête (20) selon l'une des revendications 1 à 6, dans lequel le frein annulaire (40) est un empilement de rondelles annulaires comprenant une rondelle magnétique (42) disposée entre une paire de rondelles non magnétiques (44).
     
    8. Ensemble appui-tête (20) selon les revendications 1 à 7, dans lequel la première plaque de réinitialisation (46) entre en contact avec le boîtier (50) lorsque la plaque d'appui-tête (22) est la plus éloignée de la base d'appui-tête (24).
     
    9. Ensemble appui-tête (20) selon l'une des revendications 1 à 8, dans lequel l'ensemble de frein annulaire bloque une position de la plaque d'appui-tête (22) par rapport à la base d'appui-tête (24), et où la plaque d'appui-tête (22) est réinitialisée à partir d'une position bloquée en démontant complètement la plaque d'appui-tête (22) de la base d'appui-tête (24), amenant ainsi la première plaque de réinitialisation (46) à pousser le frein annulaire (40) vers le deuxième aimant (54) de sorte que le deuxième l'aimant (54) retienne magnétiquement le frein annulaire (40), qui libère l'arbre (38) du frein annulaire (40), permettant ainsi à la plaque d'appui-tête (22) d'être poussée complètement vers la base d'appui-tête (24).
     
    10. Ensemble appui-tête (20) selon l'une des revendications 1 à 9, dans lequel lorsque la plaque d'appui-tête (22) est la plus proche de la base d'appui-tête (24), la deuxième plaque de réinitialisation (52) pousse le frein annulaire (40) dans une direction du premier aimant (48) à retenir magnétiquement par le premier aimant (48).
     
    11. Ensemble appui-tête (20) selon l'une des revendications 1 à 10, dans lequel le frein annulaire (40) est disposé entre les premier et deuxième aimants espacés (48, 54) de sorte que les première et deuxième plaques de réinitialisation (46, 52) puissent pousser le frein annulaire (40) dans une direction de l'un des premier et deuxième aimants (48, 54) pour réinitialiser l'ensemble de frein annulaire aux deux extrémités de la course pour libérer l'arbre (38).
     
    12. Ensemble appui-tête (20) selon l'une des revendications 1 à 11, dans lequel la base d'appui-tête (24) est fixée au sommet d'une paire de montants parallèles espacés (26) adaptés pour être reçus dans une partie supérieure d'un dossier de siège d'un siège de passager.
     
    13. Ensemble appui-tête (20) selon l'une des revendications 3 à 12, dans lequel un diamètre interne du frein annulaire (40) est supérieur à un diamètre externe de l'arbre (38) de sorte que le frein annulaire (40) puisse s'incliner par rapport à l'arbre (38) dans une direction du premier aimant (48) lorsque la plaque d'appui-tête (22) est la plus proche de la base d'appui-tête (24), et soit le plus proche du deuxième aimant (54) lorsque la plaque d'appui-tête (22) est séparée de la base d'appui-tête (24).
     




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    REFERENCES CITED IN THE DESCRIPTION



    This list of references cited by the applicant is for the reader's convenience only. It does not form part of the European patent document. Even though great care has been taken in compiling the references, errors or omissions cannot be excluded and the EPO disclaims all liability in this regard.

    Patent documents cited in the description