(19)
(11)EP 3 653 832 A1

(12)EUROPEAN PATENT APPLICATION
published in accordance with Art. 153(4) EPC

(43)Date of publication:
20.05.2020 Bulletin 2020/21

(21)Application number: 18832839.7

(22)Date of filing:  07.06.2018
(51)International Patent Classification (IPC): 
E06C 7/00(2006.01)
E06C 1/12(2006.01)
(86)International application number:
PCT/CN2018/090210
(87)International publication number:
WO 2019/011082 (17.01.2019 Gazette  2019/03)
(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
Designated Extension States:
BA ME
Designated Validation States:
KH MA MD TN

(30)Priority: 10.07.2017 CN 201720833364 U

(71)Applicant: Dongguan Prestige Sporting Products Co., Ltd.
Dongguan, Guangdong 523960 (CN)

(72)Inventor:
  • ZHANG, Zhao
    Dongguan Guangdong 523960 (CN)

(74)Representative: Meyer, Thorsten 
Meyer Patentanwaltskanzlei Pfarrer-Schultes-Weg 14
89077 Ulm
89077 Ulm (DE)

  


(54)TELESCOPIC PIPE BUFFER STRUCTURE


(57) A telescopic pipe buffer structure (100), comprising an inner tube (1), an outer tube (2), a buffer plate (3), a gear plate (4), and a guide sleeve (5); the inner tube (1) is slidably sleeved in the outer tube (2); the buffer plate (3), the gear plate (4), and the guide sleeve (5) correspond to the cross section of the inner tube (1); the guide sleeve (5) is fixed on an end face of the inner tube (1); the gear plate (4) is fixed on the guide sleeve (5) by means of a screw (7); a surrounding accommodating groove (6) is formed between the gear plate (4) and the guide sleeve (5); and the buffer plate (3) is provided at one side of the accommodating groove (6) close to the gear plate (4). The buffer structure (100) can enable a telescopic ladder to be cached when extending and to be rapidly retracted.




Description

FIELD OF THE INVENTION



[0001] The present invention relates to a telescopically extendable and collapsible ladder, and more particularly to a telescopic pipe buffer structure.

BACKGROUND OF THE INVENTION



[0002] Currently, the existing telescopic ladder includes two adjacent ladder legs and rungs disposed between the ladder legs. Each of the ladder legs includes a plurality of nested ladder sections which are able to slide relatively to each other to realize a telescopic function of the telescopic ladder. Sometimes, it is necessary to fix a top of the telescopic ladder to a wall or a beam. When in use, the lowermost section of the telescopic ladder is pulled down, and the lower section of the telescopic ladder drives the upper section to gradually unfold the entire telescopic ladder downward. When not in use, the lowermost section of the telescopic ladder is pushed upwards, so that the upper section is inserted into the lower section to fold the entire telescopic ladder. However, during the above-mentioned unfolding or folding process, there is no buffer effect between the adjacent upper section and the lower section. Therefore, when the lower section slides down relatively to the upper section, under the tension and gravity, the telescopic ladder is unfolded too fast thereby causing safety problems. For the existing telescopic ladder hanged on the wall or beam, the buffer effect between the upper section and the lower section is poor, and there are deficiencies in safety issues. Therefore, the existing telescopic ladder lacks safety and it is inconvenient to use.

SUMMARY OF THE INVENTION



[0003] One objective of the present invention is to provide a telescopic pipe buffer structure with simple structure, good buffer effect and high safety performance.

[0004] To achieve the above-mentioned objective, the present invention provides a telescopic pipe buffer structure includes an inner tube, an outer tube, a buffer plate, and a guard plate. The inner tube is slidably sleeved into the outer tube, and the guard plate is disposed at an end of the inner tube. Furthermore, an accommodating groove is formed between the guard plate and an end surface of the inner tube, and the buffer plate is disposed on the guard plate and located on a side of the guard plate close to the accommodating groove. Furthermore, an edge of the buffer plate is abutted against an inner wall of the outer tube, so that while the inner tube is inserted into the outer tube, the edge of the buffer plate is scrolled into the accommodating groove; and while the outer tube is pushed to make the inner tube extend outwardly from the outer tube, the buffer plate keeps slidably abutting against the inner wall of the outer tube to realize a buffer function.

[0005] In comparison with the prior art, a guard plate is provided at one end of the inner tube, and an accommodating groove is formed between the guard plate and an end surface of the inner tube, and a buffer plate is disposed on a side of the guard plate close to the accommodating groove. Furthermore, an edge of the buffer plate abuts against an inner wall of the outer tube, so that while the telescopic ladder is folded, the edge of the buffer plate is scrolled upwards into the accommodating groove thereby reducing friction; and while the telescopic ladder is unfolded, the guard plate blocks the buffer plate and the buffer plate keeps slidably abutting against the inner wall of the outer tube to realize a buffer function. The telescopic pipe buffer structure has a simple structure and good buffer effect, and can prevent the inner tube of the telescopic ladder from quickly extending outwardly thereby effectively improving safety performance of the telescopic ladder.

[0006] Preferably, the telescopic pipe buffer structure further includes a guide sleeve fixed to an end surface of the inner tube. The guide sleeve is arranged to guide the inner tube while the inner tube slides relatively to the outer tube.

[0007] Preferably, the buffer plate is a silica gel piece. Silicone material is elastic and deformable and has a large friction coefficient, which can increase a large frictional force and improve the buffer effect during use.

[0008] Specifically, the accommodating groove is surrounded the inner tube.

[0009] Specifically, the inner tube and the outer tube are triangular tubes.

BRIEF DESCRIPTION OF THE DRAWINGS



[0010] 

Fig. 1 is a structure schematic showing a telescopic ladder installed on a beam according to one embodiment of the present invention;

Fig. 2 is an exploded view of a telescopic pipe buffer structure according to one embodiment of the present invention;

Fig. 3 is a partial section view of the telescopic pipe buffer structure when the telescopic ladder is unfold; and

Fig. 4 is a partial section view of the telescopic pipe buffer structure when the telescopic ladder is fold.


DETAILED DESCRIPTION OF ILLUSTRATED EMBODIMENTS



[0011] A distinct and full description of the technical solution of the present invention will follow by combining with the accompanying drawings.

[0012] Referring to Figs. 2 and 3, the telescopic pipe buffer structure 100 includes an inner tube 1 and an outer tube 2, and the inner tube 1 is slidably sleeved into the outer tube 2. Specifically, the inner tube 1 and the outer tube 2 are triangular tubes. The telescopic pipe buffer structure 100 further includes a buffer plate 3, a guard plate 4, and a guide sleeve 5. More specifically, the cross sections of the buffer plate 3, the guard plate 4, and the guide sleeve 5 correspond to the cross section of the inner tube 1. The guard plate 4 is fixed at an end of the inner tube 1 by screws 7. Furthermore, an accommodating groove 6 surrounding the inner tube 1 is formed between the guard plate 4 and an end surface of the inner tube 1. Furthermore, a guide sleeve 5 is fixed to the end surface of the inner tube 1 and close to the accommodating groove 6, so both the guide sleeve 5 and the guard plate 4 directly face to the accommodating groove 6. The guide sleeve 5 is arranged to guide the inner tube 1 while the inner tube 1 slides relatively to the outer tube 2. Specifically, the buffer plate 3 is disposed on the guard plate 4 and located at a side of the guard plate 4 close to the accommodating groove 6. Furthermore, an edge of the buffer plate 3 is abutted against an inner wall of the outer tube 2, so that while the inner tube 1 is inserted into the outer tube 2, the edge of the buffer plate 3 is scrolled into the accommodating groove 6; and while the outer tube 2 is pushed to make the inner tube 1 extend outwardly from the outer tube 2, the edge of the buffer plate 3 keeps slidably abutting against the inner wall of the outer tube 2 to realize a buffer function.

[0013] Preferably, the buffer plate 3 is a silica gel piece. Silicone material is elastic and deformable and has a large friction coefficient, which can increase a large frictional force and improve the buffer effect during use.

[0014] As shown in Fig. 1 and Fig. 3, an upper end of the telescopic ladder 200 is fixed to a beam 300, and when the telescopic ladder 200 is unfolded, the lowermost section of the telescopic ladder 200 firstly extends downwards. Therefore, the outer tube 2 slides downward relative to the inner tube 1, at the beginning of the sliding, the edge of the buffer plate 3 slides against the inner wall of the outer tube 2 and has a tendency to deform downwardly as the outer tube 2 slides. However, because the buffer plate 3 is blocked by the guard plate 4 below, the edge of the buffer plate 3 can only abut against the inner wall of the outer tube 2 and generate great frictional resistance. Thus, the buffer plate 3 hinders the outer tube 2 from sliding downward thereby achieving a buffering effect on the outer tube 2. As shown in Fig. 4, when the telescopic ladder 200 is folded, the lowermost section of the telescopic ladder 200 is folded upwards. Therefore, the outer tube 2 slides upward relative to the inner tube 1, at the beginning of the sliding, the edge of the buffer plate 3 slidably abuts against the inner wall of the outer tube 2 and deforms upward as the outer tube 2 slides. Because the accommodating groove 6 is located above the buffer plate 3, the edge of the buffer plate 3 will be scrolled upwards into the accommodating groove 6 so as to reduce the frictional resistance. Thus, the outer tube 2 can be nested to the inner tube 1 quickly and smoothly to achieve fold the telescopic ladder 200.

[0015] In comparison with the prior art, a guard plate 4 is provided at one end of the inner tube 1, and an accommodating groove 6 is formed between the guard plate 4 and an end surface of the inner tube 1, and a buffer plate 3 is disposed on a side of the guard plate 4 close to the accommodating groove 6. Furthermore, an edge of the buffer plate 3 abuts against an inner wall of the outer tube 2, so that while the telescopic ladder 200 is folded, the edge of the buffer plate 3 is scrolled upwards into the accommodating groove 6 thereby reducing friction. While the telescopic ladder 200 is unfolded, the guard plate 4 blocks the buffer plate 3 and the buffer plate 3 keeps slidably abutting against the inner wall of the outer tube 2 to realize a buffer function. The telescopic pipe buffer structure 100 has a simple structure and good buffer effect, and can prevent the inner tube 1 of the telescopic ladder 200 from quickly extending outwardly thereby effectively improving safety performance of the telescopic ladder 200.

[0016] While the invention has been described in connection with what are presently considered to be the most practical and preferred embodiments, it is to be understood that the invention is not to be limited to the disclosed embodiments, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention.


Claims

1. A telescopic pipe buffer structure, comprising an inner tube, an outer tube, a buffer plate, and a guard plate, wherein the inner tube is slidably sleeved into the outer tube, the guard plate is disposed at an end of the inner tube, an accommodating groove is formed between the guard plate and an end surface of the inner tube, the buffer plate is disposed on the guard plate and located on a side of the guard plate close to the accommodating groove, an edge of the buffer plate is abutted against an inner wall of the outer tube, so that while the inner tube is inserted into the outer tube, the edge of the buffer plate is scrolled into the accommodating groove; and while the outer tube is pushed to make the inner tube extend outwardly from the outer tube, the buffer plate keeps slidably abutting against the inner wall of the outer tube to realize a buffer function.
 
2. The telescopic pipe buffer structure according to claim 1, further comprising a guide sleeve fixed to an end surface of the inner tube.
 
3. The telescopic pipe buffer structure according to claim 1, wherein the buffer plate is a silica gel piece.
 
4. The telescopic pipe buffer structure according to claim 1, wherein the accommodating groove is surrounded the inner tube.
 
5. The telescopic pipe buffer structure according to claim 1, wherein the inner tube and the outer tube are triangular tubes.
 




Drawing
















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