Headrest manual folding mechanism

Abstract

This invention discloses a manually folding headrest mechanism, including a bracket and a pivot crossbar. The lower part of the bracket is fitted onto the pivot crossbar and can rotate around it. A locking element is fixedly fitted onto the pivot crossbar, and a return torsion spring is fitted onto the pivot crossbar. A central crossbar parallel to the pivot crossbar is fixed in the middle of the bracket. A locking torsion spring, a locking ratchet, an unlocking ratchet, and an unlocking torsion spring are sequentially fitted onto the central crossbar. The locking ratchet and the unlocking ratchet are linked and arranged side by side. An unlocking pull is provided on the locking ratchet or the unlocking ratchet. When locked, the sidewalls of the locking ratchet and the locking ratchet abut against the sidewall of the locking element. When unlocked, pulling the unlocking pull disengages the sidewalls of the locking ratchet and the locking ratchet from the sidewall of the locking element. The locking ratchet and the locking element achieve double locking of the headrest mechanism, providing better dynamic collision safety performance and adaptability to different unlocking methods.

Description

Technical Field

[0001] This invention relates to the field of automotive seat technology, and more specifically to a manual headrest folding mechanism. Background Technology

[0002] Headrests are an important component of car seat products, playing a vital role in providing head support, reducing the risk of neck injury, and improving ride comfort.

[0003] Currently, the headrest folding mechanism in most existing car seat products is a single ratchet locking mechanism, which is not fully locked. In the event of a collision, the impact force on the headrest may cause the single ratchet mechanism to unlock, causing the headrest to move and fail to effectively support the head and neck, increasing the risk of passenger injury and failing to guarantee its safety. Summary of the Invention

[0004] To address the above technical problems, this invention provides a highly secure, manually folding headrest mechanism with double locking plates.

[0005] The technical solution is as follows: A manual folding headrest mechanism, the key point of which is that it includes a bracket and a rotating shaft crossbar, the lower part of which is fitted on the rotating shaft crossbar and can rotate around the rotating shaft crossbar;

[0006] A locking element is fixedly fitted on the crossbar of the rotating shaft, and a return torsion spring is fitted on the crossbar of the rotating shaft. The two ends of the return torsion spring are located on both sides of the axial direction of the crossbar of the rotating shaft. One end of the return torsion spring is connected to the side wall of the locking element, and the other end rests on the bracket.

[0007] A central crossbar parallel to the pivot crossbar is fixed in the middle of the bracket. A locking torsion spring, a locking ratchet, an unlocking ratchet, and an unlocking torsion spring are sequentially mounted on the central crossbar. One end of the locking torsion spring is connected to the bracket and the other end is connected to the locking ratchet. One end of the unlocking torsion spring is connected to the bracket and the other end is connected to the unlocking ratchet.

[0008] The locking and unlocking ratchet are linked and arranged side-by-side. An unlocking puller is provided on either the locking or unlocking ratchet. When locked, the sidewalls of both the locking and unlocking ratchet abut against the sidewall of the locking component. When unlocked, pulling the unlocking puller disengages the sidewalls of the locking and unlocking ratchet from the sidewall of the locking component. Using this structure, by controlling the locking ratchet and locking component, the double-locking plates of the headrest's manual folding mechanism can be locked. Unlocking requires both the locking ratchet and locking component to fold the headrest, improving safety and preventing injury during collisions. It also provides superior dynamic collision safety performance, better supporting the head and neck. Simultaneously, an unlocking device is provided on the unlocking ratchet, allowing the double-locking plates to be unlocked. After unlocking, the bracket can rotate around the pivot bar under the action of the return torsion spring, achieving the folding function.

[0009] Preferably, the bracket includes a left sheet metal bracket and a right sheet metal bracket connected together. The lower parts of the left and right sheet metal brackets are fitted onto the pivot crossbar. The two ends of the middle crossbar are respectively fixed to the left and right sheet metal brackets. The locking torsion spring, locking ratchet, unlocking ratchet, unlocking torsion spring, locking element, and reset torsion spring are all disposed between the left and right sheet metal brackets. With the above structure, the bracket is fitted onto the pivot crossbar, and the external bracket can be controlled through the internal locking torsion spring, locking ratchet, unlocking ratchet, and other components, thereby realizing the rotation of the bracket around the pivot crossbar and further achieving the purpose of overall folding.

[0010] Preferably, the locking element is a cam structure with a limiting slot on the side wall away from the reset torsion spring connection. The two walls of the limiting slot are a first limiting end and a second limiting end, respectively. A limiting crossbar parallel to the rotating shaft crossbar is fixed on the bracket, located on one side of the rotating shaft crossbar and within the limiting slot. This structure effectively limits the bracket's movement, cooperating with the upper locking ratchet to achieve double-locking, while ensuring the bracket can only rotate within the limiting slot, preventing excessive rotation and damage.

[0011] Preferably, a limiting protrusion is provided on the upper end of the outer wall of the locking member, and limiting notches are provided on the outer walls of the locking ratchet and unlocking ratchet corresponding to the limiting protrusion. When locking, the limiting notches are engaged with the limiting protrusion. With this structure, dual-plate locking control of the locking ratchet and locking member can be achieved. When unlocking, the unlocking ratchet drives the locking ratchet to disengage from the limiting protrusion of the locking member.

[0012] Preferably, a linkage notch is provided on the outer wall of the locking ratchet, and this linkage notch is located on the same side as the limiting groove. A locking pin is provided on the side of the unlocking ratchet near the locking ratchet, and the locking pin extends into the linkage notch. The unlocking pull is connected to the unlocking ratchet. Pulling the unlocking pull causes the unlocking ratchet to rotate and disengage from the locking member, unlocking it. At the same time, the unlocking ratchet drives the locking ratchet to rotate and disengage from the locking member, unlocking it. With the above structure, the locking pin can lock the locking ratchet, preventing unlocking due to collision during use and avoiding injury to personnel, thus ensuring high safety performance.

[0013] Preferably, one end of the locking torsion spring is fixed to the left sheet metal bracket, and the other end is connected to the side of the locking ratchet away from the linkage notch;

[0014] One end of the unlocking torsion spring is connected to the side of the unlocking ratchet near the locking pin, and the other end is fixed to the right sheet metal bracket;

[0015] One end of the reset torsion spring is fixed to the left sheet metal bracket, and the other end is connected to the side of the locking component away from the limiting slot. With the above structure, the torsion spring can restore the original shape after the relative position relationship between the locking ratchet and the unlocking ratchet is changed by external force. At the same time, it can cooperate with the locking pin to limit the locking ratchet and keep it in a stable locked state. When not unlocked, the reset torsion spring can fix and lock the locking cam together with the limiting crossbar. After unlocking, the reset torsion spring drives the outer bracket to reset.

[0016] As a preferred embodiment, it also includes two support tubes arranged side by side, each of which has a crossbar bracket fixed at its upper end. The two ends of the pivot crossbar can extend out of the left sheet metal bracket and the right sheet metal bracket, respectively, and the extended ends of the crossbar are fixed to the crossbar brackets at the upper ends of the two support tubes.

[0017] An outer shell is fitted over the connection between the support tube and the crossbar bracket, and through holes are formed in both the crossbar bracket and the outer shell, allowing the support tube hole to pass through. With this structure, the lower support tube and the upper folding section can be connected together via the crossbar bracket, thus enabling the entire unit to be installed on the car seat.

[0018] Preferably, the unlocking mechanism is a cable with a connecting hole on the unlocking ratchet. A connecting tube is connected through this hole, one end of the cable passes through the connecting tube, and the other end passes through a perforation on the crossbar bracket and the outer casing, exiting from the support tube. With this structure, pulling the cable connected to the unlocking ratchet unlocks the locking cam and the locking ratchet, achieving the purpose of folding the headrest.

[0019] Preferably, the unlocking pull is a pull strap, which is connected to the upper end of the unlocking ratchet by screws. The outer end of the pull strap extends from the rear of the left and right sheet metal brackets. With this structure, by changing the form of the unlocking pull, it can accommodate pull-strap unlocking. Pulling the pull strap on the unlocking ratchet can drive the connected unlocking ratchet to rotate, thereby unlocking the locking ratchet and locking cam, achieving the purpose of folding.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows: the headrest mechanism is locked by a locking ratchet and a locking plate. The manual folding mechanism of the headrest with double locking plates can solve the safety risks of the semi-locking function in current products on the market due to the mechanism principle, and has better dynamic collision safety performance. At the same time, it can be adapted to different unlocking methods. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the present invention;

[0022] Figure 2 for Figure 1 Another perspective illustration;

[0023] Figure 3 for Figure 1 The front view;

[0024] Figure 4 This is a schematic diagram of the central double-locking plate structure;

[0025] Figure 5 for Figure 4 Another perspective illustration;

[0026] Figure 6 A schematic diagram of the structure for unlocking cable 15b;

[0027] Figure 7 This is a schematic diagram of the unlocking structure for the 15a pull strap. Detailed Implementation

[0028] The present invention will be further described below with reference to the embodiments and accompanying drawings.

[0029] like Figures 1 to 5 As shown, a manual folding headrest mechanism includes a bracket 1 and a pivot crossbar 3. A headrest ring 18 is fixed on the upper part of the bracket 1. The lower part of the bracket 1 is fitted onto the pivot crossbar 3 and can rotate around the pivot crossbar 3.

[0030] A locking member 6 is fixedly sleeved on the rotating shaft crossbar 3, and a return torsion spring 8 is sleeved on the rotating shaft crossbar 3. The two ends of the return torsion spring 8 are respectively located on both sides of the axial direction of the rotating shaft crossbar 3. One end of the return torsion spring 8 is connected to the side wall of the locking member 6, and the other end rests on the bracket 1.

[0031] A central crossbar 2, parallel to the pivot crossbar 3, is fixed in the middle of the bracket 1. A locking torsion spring 7, a locking ratchet 4, an unlocking ratchet 5, and an unlocking torsion spring 14 are sequentially mounted on the central crossbar 2. One end of the locking torsion spring 7 is connected to the bracket 1, and the other end is connected to the locking ratchet 4. One end of the unlocking torsion spring 14 is connected to the bracket 1, and the other end is connected to the unlocking ratchet 5.

[0032] The locking ratchet 4 and unlocking ratchet 5 are linked and arranged side by side. An unlocking pull is provided on the locking ratchet 4 or the unlocking ratchet 5. When locked, the side walls of the locking ratchet 4 and the unlocking ratchet 5 are abutted against the side wall of the locking member 6. When unlocked, the unlocking pull is pulled, and the side walls of the locking ratchet 4 and the unlocking ratchet 5 are disengaged from the side wall of the locking member 6.

[0033] The bracket 1 shown includes a left sheet metal bracket 1a and a right sheet metal bracket 1b connected together. The lower parts of the left sheet metal bracket 1a and the right sheet metal bracket 1b are fitted onto the pivot crossbar 3. The two ends of the middle crossbar 2 are respectively fixed to the left sheet metal bracket 1a and the right sheet metal bracket 1b. The locking torsion spring 7, the locking ratchet 4, the unlocking ratchet 5, the unlocking torsion spring 14, the locking element 6, and the reset torsion spring 8 are all arranged between the left sheet metal bracket 1a and the right sheet metal bracket 1b.

[0034] The locking member 6 is a cam structure. A limiting slot is formed on the side wall of the locking member 6 away from the connection side of the reset torsion spring 8. The two walls of the limiting slot are the first limiting end and the second limiting end, respectively. A limiting crossbar 10 parallel to the rotating shaft crossbar 3 is fixed on the bracket 1. The limiting crossbar 10 is located on one side of the rotating shaft crossbar 3 and is located in the limiting slot. When locked, the limiting crossbar 10 is located at the first limiting end. When unlocked, the limiting crossbar 10 is located at the second limiting end.

[0035] The upper end of the outer wall of the locking member 6 is provided with a limiting protrusion. The outer walls of the locking ratchet 4 and the unlocking ratchet 5 are provided with limiting notches corresponding to the limiting protrusion. When locked, the limiting notches are engaged with the limiting protrusion. A linkage notch is provided on the outer wall of the locking ratchet 4. The linkage notch is located on the same side as the limiting groove. A locking pin 9 is provided on the side of the unlocking ratchet 5 near the locking ratchet 4. The locking pin 9 extends into the linkage notch. The unlocking pull is connected to the unlocking ratchet 5. Pulling the unlocking pull causes the unlocking ratchet 5 to rotate and disengage from the locking member 6 to unlock. At the same time, the unlocking ratchet 5 drives the locking ratchet 4 to rotate and disengage from the locking member 6 to unlock.

[0036] An outer protruding ring 201 is integrally provided at 2 / 3 of the middle crossbar 2. The locking ratchet 4 and the unlocking ratchet 5 are sequentially sleeved on one side of the outer protruding ring 201, wherein one side of the locking ratchet 4 abuts against the outer protruding ring 201.

[0037] A locking torsion spring 7 is sleeved on one side of the middle crossbar 2. One end of the locking torsion spring 7 is fixed on the left sheet metal bracket 1a, and the other end is connected to the side of the locking ratchet 4 away from the linkage notch. The locking torsion spring 7 and the locking pin 9 can work together to keep the locking ratchet 4 locked.

[0038] An unlocking torsion spring 14 is provided on the other side of the middle crossbar 2. A bushing is provided on the outside of the unlocking ratchet 5. The bushing is sleeved on the middle crossbar 2. The unlocking torsion spring 14 is installed on the outside of the bushing. One end of the unlocking torsion spring 14 is connected to the side of the unlocking ratchet 5 near the locking pin 9, and the other end is fixed on the right sheet metal bracket 1b. The unlocking torsion spring 14 can unlock the locking ratchet 4 and the unlocking ratchet 5. After unlocking, it can be reset again due to the action of the torsion spring.

[0039] One end of the reset torsion spring 8 is fixed on the left sheet metal bracket 1a, and the other end is connected to the side of the locking member 6 away from the limiting slot. The reset torsion spring 8 can work together with the limiting crossbar 10 to keep the locking member 6 locked. After unlocking, the sheet metal bracket 1 and the locking member 6 can be reset by the reset torsion spring 8.

[0040] The manual folding mechanism of the headrest also includes two support tubes 12 arranged side by side. Each support tube 12 has a crossbar bracket 11 fixed to its upper end. The two ends of the pivot crossbar 3 can extend out of the left sheet metal bracket 1a and the right sheet metal bracket 1b, respectively. The extended ends of the crossbars are fixed to the crossbar brackets 11 at the upper ends of the two support tubes 12. A housing 13 is fitted at the connection between the support tubes 12 and the crossbar brackets 11. Both the crossbar brackets 11 and the housing 13 have through holes that pass through the tube holes of the support tubes 12.

[0041] The headrest's manual folding mechanism can accommodate two different unlocking methods: cable 15b unlocking and strap 15a unlocking.

[0042] Example 1: Cable 15b unlocking

[0043] like Figure 6 As shown, when the unlocking pull is the cable 15b, a connecting hole 501 is opened on the unlocking ratchet 5, and a connecting tube 16 is connected through the connecting hole 501. One end of the cable 15b passes through the connecting tube 16 and the other end passes through the support tube 12 through the perforations provided on the crossbar bracket 11 and the outer shell 13. The headrest mechanism can be unlocked and folded by pulling the cable 15b.

[0044] One side of the connecting pipe 16 is provided with an outwardly protruding limiting member, which can extend into the connecting hole 501 of the unlocking ratchet 5 and is close to one end of the limiting hole 501. The upper end of the right sheet metal bracket 1b is provided with an outwardly protruding mounting port 1b1. The cable 15b is provided with a through tube 17 near the upper end of the right sheet metal bracket 1b. The inside of the cable 15b is a steel strand, which can extend into the through tube 17 and connect to the connecting pipe 16 on the front side. The through tube 17 can be inserted into the mounting port 1b1 and remain stationary.

[0045] A circular hole is provided on the rotating shaft 3 near the side of the reset torsion spring 8. The cable 15b can extend into the circular hole, pass through the support tube 12, and connect to the external mechanism to realize the control of the headrest.

[0046] Example 2: Unlocking with pull strap 15a

[0047] like Figure 7 As shown, when the unlocking method is unlocking via the pull strap 15a, the upper end of the pull strap 15a is connected to the unlocking ratchet 5 by a screw. The outer end of the pull strap 15a extends from the rear of the left sheet metal bracket 1a and the right sheet metal bracket 1b, thereby enabling the pull strap 15a to be pulled. Driven by the pull strap 15a, the locking pin 9 set on the unlocking ratchet 5 can push the locking ratchet 4 to rotate around the central crossbar 2, thereby releasing the locking of the locking member 6 and thus unlocking. After unlocking, under the action of the return torsion spring 8, the bracket 1 can rotate around the pivot crossbar 3 to achieve the folding function.

[0048] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention. Those skilled in the art, under the guidance of the present invention, can make various similar representations without departing from the spirit and claims of the present invention, and such modifications all fall within the protection scope of the present invention.

Claims

1. A manually folding headrest mechanism, characterized in that: It includes a bracket (1) and a rotating shaft crossbar (3), the lower part of which is fitted onto the rotating shaft crossbar (3) and can rotate around the rotating shaft crossbar (3); A locking element (6) is fixedly sleeved on the rotating shaft crossbar (3), and a reset torsion spring (8) is sleeved on the rotating shaft crossbar (3). The two ends of the reset torsion spring (8) are located on both sides of the axial direction of the rotating shaft crossbar (3). One end of the reset torsion spring (8) is connected to the side wall of the locking element (6), and the other end rests on the bracket (1). A central crossbar (2) parallel to the pivot crossbar (3) is fixed in the middle of the bracket (1). A locking torsion spring (7), a locking ratchet (4), an unlocking ratchet (5) and an unlocking torsion spring (14) are sequentially mounted on the central crossbar (2). One end of the locking torsion spring (7) is connected to the bracket (1) and the other end is connected to the locking ratchet (4). One end of the unlocking torsion spring (14) is connected to the bracket (1) and the other end is connected to the unlocking ratchet (5). The locking ratchet (4) and unlocking ratchet (5) are linked and arranged side by side. An unlocking pull is provided on the locking ratchet (4) or unlocking ratchet (5). When locked, the side walls of the locking ratchet (4) and unlocking ratchet (5) are abutted against the side wall of the locking member (6). When unlocked, the unlocking pull is pulled, and the side walls of the locking ratchet (4) and unlocking ratchet (5) are disengaged from the side wall of the locking member (6). A limiting slot is provided on the side wall of the locking member (6) away from the side connected to the reset torsion spring (8), and a linkage notch is provided on the outer side wall of the locking ratchet (4). A locking pin (9) is provided on the side of the unlocking ratchet (5) close to the locking ratchet (4), and the locking pin (9) extends into the linkage notch.

2. The headrest manual folding mechanism according to claim 1, characterized in that: The bracket (1) includes a left sheet metal bracket (1a) and a right sheet metal bracket (1b) connected together. The lower parts of the left sheet metal bracket (1a) and the right sheet metal bracket (1b) are fitted on the pivot crossbar (3). The two ends of the middle crossbar (2) are fixed on the left sheet metal bracket (1a) and the right sheet metal bracket (1b) respectively. The locking torsion spring (7), the locking ratchet (4), the unlocking ratchet (5), the unlocking torsion spring (14), the locking part (6), and the reset torsion spring (8) are all arranged between the left sheet metal bracket (1a) and the right sheet metal bracket (1b).

3. The headrest manual folding mechanism according to claim 1 or 2, characterized in that: The locking member (6) is a cam structure, and the two groove walls of its limiting groove are the first limiting end and the second limiting end, respectively. A limiting crossbar (10) parallel to the rotating shaft crossbar (3) is fixed on the bracket (1). The limiting crossbar (10) is located on one side of the rotating shaft crossbar (3) and the limiting crossbar (10) is located in the limiting groove.

4. The headrest manual folding mechanism according to claim 3, characterized in that: The upper end of the outer wall of the locking member (6) is provided with a limiting protrusion, and the outer walls of the locking ratchet (4) and the unlocking ratchet (5) are provided with limiting notches corresponding to the limiting protrusion. When locked, the limiting notches are stuck on the limiting protrusion.

5. The headrest manual folding mechanism according to claim 3, characterized in that: The linkage notch and the limiting slot are located on the same side. The unlocking pull is connected to the unlocking ratchet (5). Pulling the unlocking pull causes the unlocking ratchet (5) to rotate and disengage from the locking member (6) to unlock. At the same time, the unlocking ratchet (5) drives the locking ratchet (4) to rotate and disengage from the locking member (6) to unlock.

6. The headrest manual folding mechanism according to claim 2, characterized in that: One end of the locking torsion spring (7) is fixed on the left sheet metal bracket (1a), and the other end is connected to the side of the locking ratchet (4) away from the linkage notch; One end of the unlocking torsion spring (14) is connected to the side of the unlocking ratchet (5) near the locking pin (9), and the other end is fixed to the right sheet metal bracket (1b); One end of the reset torsion spring (8) is fixed on the left sheet metal bracket (1a), and the other end is connected to the side of the locking member (6) away from the limiting groove.

7. The headrest manual folding mechanism according to claim 6, characterized in that: It also includes two support tubes (12) arranged side by side, each of which has a crossbar bracket (11) fixed at its upper end. The two ends of the rotating shaft crossbar (3) can extend out of the left sheet metal bracket (1a) and the right sheet metal bracket (1b), respectively, and the extended ends of both ends are fixed on the crossbar bracket (11) at the upper end of the two support tubes (12). An outer shell (13) is fitted over the connection between the support tube (12) and the crossbar bracket (11), and a through hole is opened on both the crossbar bracket (11) and the outer shell (13) to pass through the tube hole of the support tube (12).

8. The headrest manual folding mechanism according to claim 7, characterized in that: The unlocking pull is a cable (15b), and a connecting hole (501) is opened on the unlocking ratchet (5). A connecting pipe (16) is connected through the connecting hole (501). One end of the cable (15b) passes through the connecting pipe (16) and the other end passes through the support pipe (12) through the perforations provided on the crossbar bracket (11) and the outer shell (13).

9. The headrest manual folding mechanism according to claim 7, characterized in that: The unlocking pull is a pull strap (15a), which is connected to the upper end of the unlocking ratchet (5) by screws. The outer end of the pull strap (15a) extends out from the rear of the left sheet metal bracket (1a) and the right sheet metal bracket (1b).

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