Manual folding mechanism for headrest

Abstract

The manual headrest folding mechanism comprises a support and a rotating shaft transverse rod, the lower portion of the support is arranged on the rotating shaft transverse rod in a sleeving mode, and the support can rotate around the rotating shaft transverse rod; a rotating shaft cross rod is fixed on the support, a locking piece is fixedly sleeved on the rotating shaft cross rod, a reset torsion spring is sleeved on the rotating shaft cross rod, a middle cross rod parallel to the rotating shaft cross rod is fixed in the middle of the support, a locking torsion spring, a locking ratchet wheel, an unlocking ratchet wheel and an unlocking torsion spring are sequentially sleeved on the middle cross rod, and the locking ratchet wheel and the unlocking ratchet wheel are arranged side by side in a linkage mode. An unlocking pull piece is arranged on the locking ratchet wheel or the unlocking ratchet wheel, during locking, the side walls of the locking ratchet wheel and the locking ratchet wheel abut against the side wall of the locking piece, during unlocking, the unlocking pull piece is pulled, the side walls of the locking ratchet wheel and the locking ratchet wheel are disengaged from the side wall of the locking piece, and the locking ratchet wheel and the locking ratchet wheel are separated from the side wall of the locking piece. The locking ratchet wheel and the locking piece are used for achieving double-locking-piece locking on the headrest mechanism, the dynamic collision safety performance is better, and meanwhile the headrest mechanism can be matched with different unlocking modes.

Description

Technical Field

[0001] The invention relates to the technical field of automobile seats, and in particular to a manual folding mechanism for a headrest. Background Art

[0002] The headrest is one of the important products in car seat products. It plays an important role in providing head support, reducing the risk of neck injuries and improving riding comfort.

[0003] At present, the forward folding mechanism of the headrest of existing automobile seat products is basically a single ratchet locking mechanism, which is not completely locked. When the vehicle collides, the collision force acts on the headrest, which 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 injury to passengers and failing to ensure their safety. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a manual folding mechanism for a headrest with high safety performance and capable of being locked by double locking plates.

[0005] The technical solution is as follows: A manual folding mechanism for a headrest, the main points of which are that it comprises a bracket and a rotating shaft cross bar, the lower part of the bracket is sleeved on the rotating shaft cross bar and can rotate around the rotating shaft cross bar;

[0006] A locking piece is fixedly sleeved on the rotating shaft cross bar, and a reset torsion spring is sleeved on the rotating shaft cross bar. The two ends of the reset torsion spring are respectively located on both sides of the axial direction of the rotating shaft cross bar, one end of the reset torsion spring is connected to the side wall of the locking piece, and the other end rests on the bracket;

[0007] A middle cross bar parallel to the shaft cross bar is fixed in the middle of the bracket, and a locking torsion spring, a locking ratchet, an unlocking ratchet and an unlocking torsion spring are sequentially mounted on the middle cross bar, wherein one end of the locking torsion spring is connected to the bracket and the other end is connected to the locking ratchet, and 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 ratchet and the unlocking ratchet are arranged in parallel in linkage, and an unlocking pull piece is arranged on the locking ratchet or the unlocking ratchet. When locked, the side walls of the locking ratchet and the unlocking ratchet are both against the side walls of the locking part. When unlocked, the unlocking pull piece is pulled, and the side walls of the locking ratchet and the unlocking ratchet are disengaged from the side walls of the locking part. With the above structure, by controlling the locking ratchet and the locking part, the double locking pieces of the manual folding mechanism of the headrest can be locked. When unlocking, both the locking ratchet and the locking piece need to be unlocked before the headrest can be folded, which improves the safety of the headrest and avoids the headrest being unlocked during a collision, thereby causing injuries to the user. It has better dynamic collision safety performance and can better support the head and neck. At the same time, an unlocking device is arranged on the unlocking ratchet, and the double locking pieces can be unlocked by the unlocking device. After unlocking, under the action of the reset torsion spring, the bracket can rotate around the rotating shaft cross bar to achieve 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 sheet metal bracket and the right sheet metal bracket are sleeved on the rotating shaft cross bar, the two ends of the middle cross bar are respectively fixed on the left sheet metal bracket and the right sheet metal bracket, and the locking torsion spring, locking ratchet, unlocking ratchet, unlocking torsion spring, locking member and reset torsion spring are all arranged between the left sheet metal bracket and the right sheet metal bracket. With the above structure, the bracket is sleeved on the rotating shaft cross bar, and the external bracket can be controlled by the internal locking torsion spring, locking ratchet, unlocking ratchet and other components, so that the bracket can rotate around the rotating shaft cross bar, further achieving the purpose of overall folding.

[0010] Preferably, the locking member is a cam structure, and a limiting slot is provided on the side wall of the locking member away from the connection side of the reset torsion spring, and the two slot walls of the limiting slot are respectively the first limiting end and the second limiting end, and a limiting cross bar parallel to the rotating shaft cross bar is fixed on the bracket, and the limiting cross bar is located on one side of the rotating shaft cross bar, and the limiting cross bar is located in the limiting slot. The above structure can limit the bracket, cooperate with the locking ratchet above to achieve double locking, and at the same time ensure that the bracket can only rotate within the range of the limiting slot to avoid excessive rotation and damage.

[0011] Preferably, a limiting protrusion is provided on the upper end of the outer wall of the locking member, and a limiting notch is provided on the outer wall of the locking ratchet and the unlocking ratchet corresponding to the limiting protrusion. When locked, the limiting notch is stuck on the limiting protrusion. With the above structure, the double locking piece locking control of the locking ratchet and the locking member can be realized. When unlocked, the locking ratchet is driven by the unlocking ratchet to disengage from the limiting protrusion of the locking member.

[0012] Preferably, a linkage notch is provided on the outer side wall of the locking ratchet, the linkage notch and the limiting notch are located on the same side, a locking pin is provided on the side of the unlocking ratchet close to the locking ratchet, the locking pin extends into the linkage notch, the unlocking puller is connected to the unlocking ratchet, the unlocking puller is pulled, the unlocking ratchet rotates to disengage from the locking part to unlock, and the unlocking ratchet drives the locking ratchet to rotate to disengage from the locking part to unlock. With the above structure, the locking pin can lock the locking ratchet, which can prevent the unlocking from being caused by collision during use, thereby preventing injuries to personnel, and has 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 a side of the unlocking ratchet wheel close to 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 member away from the limiting notch. With the above structure, the torsion spring can restore the locking ratchet and the unlocking ratchet to their original state after the relative position relationship between the locking ratchet and the unlocking ratchet is changed by external force, and can cooperate with the locking pin to limit the locking ratchet to 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 cross bar. 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 to its upper end, and the two ends of the rotating shaft crossbar can extend out of the left sheet metal bracket and the right sheet metal bracket respectively, and the extended ends at both ends are respectively fixed to the crossbar brackets at the upper ends of the two support tubes;

[0017] A shell is provided outside the connection between the support tube and the crossbar bracket, and holes are provided on the crossbar bracket and the shell to penetrate the tube hole of the support tube. With the above structure, the support tube at the lower end and the folded part at the upper end can be connected together through the crossbar bracket, so as to realize the overall installation on the car seat.

[0018] Preferably, the unlocking pull is a cable, a connection hole is formed on the unlocking ratchet, a connecting pipe is connected through the connection hole, one end of the cable passes through the connecting pipe, and the other end passes through the through hole formed on the crossbar bracket and the housing and out of the support tube. With the above structure, pulling the cable connected to the unlocking ratchet can unlock the locking cam and the locking ratchet, thereby achieving the purpose of folding the headrest.

[0019] Preferably, the unlocking pull is a drawstring, which is connected to the upper end of the unlocking ratchet by screws, and the outer end of the drawstring passes through the rear of the left sheet metal bracket and the right sheet metal bracket. With the above structure, the unlocking pull can be replaced to adapt to the drawstring unlocking, and the connected unlocking ratchet can be driven to rotate by pulling the drawstring on the unlocking ratchet, thereby unlocking the locking ratchet and the locking cam, thereby achieving the purpose of folding.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows: the double locking plate locking of the headrest mechanism is achieved by utilizing the locking ratchet and the locking member double locking plate, and the double locking plate headrest manual folding mechanism can solve the safety risks of the semi-locking function of the current products on the market due to the mechanism principle, and has better dynamic collision safety performance, and can adapt to different unlocking forms. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the present invention;

[0022] Figure 2 for Figure 1 Schematic diagram from another angle;

[0023] Figure 3 for Figure 1 A front view of

[0024] Figure 4 It is a schematic diagram of the structure of the middle double locking piece;

[0025] Figure 5 for Figure 4 Schematic diagram from another angle;

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

[0027] Figure 7 This is a schematic diagram of the unlocking structure of the pull strap 15a. DETAILED DESCRIPTION

[0028] The present invention is further described below in conjunction with embodiments and drawings.

[0029] like Figures 1 to 5 As shown, a manual folding mechanism for a headrest comprises a bracket 1 and a rotating shaft cross bar 3, wherein a headrest ring bar 18 is fixed to the upper part of the bracket 1; the lower part of the bracket 1 is sleeved on the rotating shaft cross bar 3 and can rotate around the rotating shaft cross bar 3;

[0030] A locking member 6 is fixedly sleeved on the rotating shaft cross bar 3, and a reset torsion spring 8 is sleeved on the rotating shaft cross bar 3. The two ends of the reset torsion spring 8 are respectively located on both sides of the axial direction of the rotating shaft cross bar 3. One end of the reset 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 middle cross bar 2 parallel to the shaft cross bar 3 is fixed in the middle of the bracket 1, and a locking torsion spring 7, a locking ratchet 4, an unlocking ratchet 5 and an unlocking torsion spring 14 are sequentially mounted on the middle cross bar 2, wherein 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, and 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 the unlocking ratchet 5 are arranged side by side in a linked manner, and an unlocking pull piece is provided on the locking ratchet 4 or the unlocking ratchet 5. When locking, the side walls of the locking ratchet 4 and the unlocking ratchet 5 are both against the side walls of the locking member 6. When unlocking, the unlocking pull piece is pulled, and the side walls of the locking ratchet 4 and the unlocking ratchet 5 are disengaged from the side walls 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 mounted on the rotating shaft cross bar 3, and the two ends of the middle cross bar 2 are respectively fixed on the left sheet metal bracket 1a and the right sheet metal bracket 1b, and the locking torsion spring 7, locking ratchet 4, unlocking ratchet 5, unlocking torsion spring 14, locking member 6 and 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, and a limiting slot is provided on the side wall of the locking member 6 away from the connection side of the reset torsion spring 8, and the two slot walls of the limiting slot are respectively the first limiting end and the second limiting end. A limiting cross bar 10 parallel to the rotating shaft cross bar 3 is fixed on the bracket 1, and the limiting cross bar 10 is located on one side of the rotating shaft cross bar 3, and the limiting cross bar 10 is located in the limiting slot. When it is locked, the limiting cross bar 10 is located at the first limiting end, and when it is unlocked, the limiting cross bar 10 is located at the second limiting end.

[0035] A limiting protrusion is provided on the upper end of the outer side wall of the locking member 6, and a limiting notch is provided on the outer side walls of the locking ratchet 4 and the unlocking ratchet 5 corresponding to the limiting protrusion. When locked, the limiting notch is stuck on the limiting protrusion; a linkage notch is provided on the outer side wall of the locking ratchet 4, and the linkage notch and the limiting notch are located on the same side, and 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, and the unlocking puller is connected with the unlocking ratchet 5. When the unlocking puller is pulled, the unlocking ratchet 5 rotates to disengage from the locking member 6 to unlock, and at the same time, the unlocking ratchet 5 drives the locking ratchet 4 to rotate to disengage from the locking member 6 to unlock.

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

[0037] A locking torsion spring 7 is provided on one side of the middle cross bar 2, one end of the locking torsion spring 7 is fixed to 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, and the locking torsion spring 7 can work together with the locking pin 9 to maintain the locking state of the locking ratchet 4;

[0038] An unlocking torsion spring 14 is arranged on the other side of the middle cross bar 2, and a shaft sleeve is arranged on the outer side of the unlocking ratchet 5. The shaft sleeve is sleeved on the middle cross bar 2, and the unlocking torsion spring 14 is installed on the outer side of the shaft sleeve. One end of the unlocking torsion spring 14 is connected to the side of the unlocking ratchet 5 close to the locking pin 9, and the other end is fixed to the right sheet metal bracket 1b. The unlocking torsion spring 14 can unlock the locking ratchet 4 and the unlocking ratchet 5, and can be reset again after unlocking 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 groove. The reset torsion spring 8 can maintain the locking state of the locking member 6 together with the limiting cross bar 10. 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, and a cross bar bracket 11 is fixed to the upper end of each support tube 12. The two ends of the rotating shaft cross bar 3 can respectively extend out of the left sheet metal bracket 1a and the right sheet metal bracket 1b, and the extended ends at both ends are respectively fixed on the cross bar bracket 11 at the upper ends of the two support tubes 12; an outer shell 13 is arranged outside the connection between the support tube 12 and the cross bar bracket 11, and through holes are opened on the cross bar bracket 11 and the outer shell 13 to pass through the tube hole of the support tube 12.

[0041] The manual folding mechanism of the headrest can adapt to two different unlocking modes, namely unlocking by the cable 15b and unlocking by the pull belt 15a.

[0042] Embodiment 1: Unlocking of the cable 15b

[0043] like Figure 6 As shown, when the unlocking pull is unlocked by the cable 15b, a connecting hole 501 is opened on the unlocking ratchet 5, and 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 tube 12 through the through holes set on the cross bar bracket 11 and the outer shell 13. The headrest mechanism can be unlocked and folded by pulling the cable 15b.

[0044] A limiting piece protruding outward is provided on one side of the connecting pipe fitting 16, and the limiting piece can extend into the connecting hole 501 of the unlocking ratchet 5 and is close to one end of the limiting hole 501. An installation opening 1b1 protruding outward is provided at the upper end of the right sheet metal bracket 1b. The cable 15b is provided with a through pipe 17 near the upper end of the right sheet metal bracket 1b. The interior of the cable 15b is a steel strand, and the steel strand can extend into the through pipe 17 and be connected to the connecting pipe fitting 16 on the front side. The through pipe 17 can be stuck in the installation opening 1b1 and remain stationary.

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

[0046] Embodiment 2: Unlocking of drawstring 15a

[0047] like Figure 7 As shown, when the unlocking form is that the pull strap 15a is unlocked, the pull strap 15a is connected to the upper end of the unlocking ratchet 5 by a screw, and the outer end of the pull strap 15a passes through the rear of the left sheet metal bracket 1a and the right sheet metal bracket 1b, so that the pull strap 15a can be pulled. Under the drive of the pull strap 15a, the locking pin 9 arranged on the unlocking ratchet 5 can push the locking ratchet 4 to rotate around the middle cross bar 2 together, so that it releases the lock on the locking piece 6, thereby realizing unlocking. After unlocking, under the action of the reset torsion spring 8, the bracket 1 can rotate around the rotating shaft cross bar 3 to realize the folding function.

[0048] Finally, it should be noted that the above description is only a preferred embodiment of the present invention. Under the guidance of the present invention, ordinary technicians in this field can make various similar expressions without violating the purpose and claims of the present invention, and such changes all fall within the scope of protection of the present invention.

Claims

1. A manual folding mechanism for a headrest, characterized in that: It comprises a bracket (1) and a rotating shaft cross bar (3), wherein the lower part of the bracket (1) is sleeved on the rotating shaft cross bar (3) and can rotate around the rotating shaft cross bar (3); A locking member (6) is fixedly sleeved on the rotating shaft cross bar (3), and a reset torsion spring (8) is sleeved on the rotating shaft cross bar (3). The two ends of the reset torsion spring (8) are respectively located on both sides of the axial direction of the rotating shaft cross bar (3), one end of the reset torsion spring (8) is connected to the side wall of the locking member (6), and the other end rests on the bracket (1); A middle cross bar (2) parallel to the rotating shaft cross bar (3) is fixed in the middle of the bracket (1), and a locking torsion spring (7), a locking ratchet (4), an unlocking ratchet (5) and an unlocking torsion spring (14) are sequentially mounted on the middle cross bar (2), wherein 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), and 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 the unlocking ratchet (5) are arranged in parallel in a linked manner. An unlocking pull piece is arranged on the locking ratchet (4) or the unlocking ratchet (5). When locking, the side walls of the locking ratchet (4) and the unlocking ratchet (5) are both against the side walls of the locking member (6). When unlocking, the unlocking pull piece is pulled, and the side walls of the locking ratchet (4) and the unlocking ratchet (5) are disengaged from the side walls of the locking member (6).

2. The manual folding mechanism for headrest according to claim 1, characterized in that: The bracket (1) comprises a left sheet metal bracket (1a) and a right sheet metal bracket (1b) connected together, wherein the lower parts of the left sheet metal bracket (1a) and the right sheet metal bracket (1b) are mounted on the rotating shaft cross bar (3), and the two ends of the middle cross bar (2) are respectively fixed on the left sheet metal bracket (1a) and the right sheet metal bracket (1b), and the locking torsion spring (7), the locking ratchet (4), the unlocking ratchet (5), the unlocking torsion spring (14), the locking member (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 manual folding mechanism for headrest according to claim 1 or 2, characterized in that: The locking member (6) is a cam structure, and a limiting slot is provided on the side wall of the locking member (6) away from the connection side of the return torsion spring (8), and the two slot walls of the limiting slot are respectively a first limiting end and a second limiting end. A limiting cross bar (10) parallel to the rotating shaft cross bar (3) is fixed on the bracket (1), and the limiting cross bar (10) is located on one side of the rotating shaft cross bar (3), and the limiting cross bar (10) is located in the limiting slot.

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

5. The manual folding mechanism for the headrest according to claim 3, characterized in that: A linkage notch is provided on the outer side wall of the locking ratchet (4), and the linkage notch and the limiting notch are located on the same side. 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. The unlocking puller is connected to the unlocking ratchet (5). When the unlocking puller is pulled, the unlocking ratchet (5) rotates to disengage from the locking member (6) to unlock, and at the same time, the unlocking ratchet (5) drives the locking ratchet (4) to rotate to disengage from the locking member (6) to unlock.

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

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

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

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

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