CN113401016B

CN113401016B - Manual turnover device for automobile seat backrest and automobile seat

Info

Publication number: CN113401016B
Application number: CN202110851110.9A
Authority: CN
Inventors: 王永利; 梁红兵; 唐韵华; 陈静涛; 梁杰
Original assignee: Keiper Changshu Seating Mechanisms Co Ltd
Current assignee: Keiper Changshu Seating Mechanisms Co Ltd
Priority date: 2021-07-27
Filing date: 2021-07-27
Publication date: 2022-07-12
Anticipated expiration: 2041-07-27
Also published as: CN113401016A

Abstract

The invention relates to a manual folding device for a vehicle seat backrest, comprising a locking claw, a base plate, a pawl and a cam, wherein the locking claw is provided with a protruding part protruding outwards in the radial direction, the base plate can rotate around a first axis of the locking claw, the pawl is rotatably arranged on the base plate around a second axis parallel to the first axis and is provided with a containing groove, the cam is rotatably arranged on the base plate around a third axis parallel to the first axis and is provided with a self-locking part, the self-locking part is contained in the containing groove and is directly contacted and matched with the pawl, and the pawl acts on the protruding part to limit a falling locking state. The invention also provides an automobile seat which comprises the manual turnover device. According to the manual turnover device for the automobile seat backrest, the self-locking part of the cam is accommodated in the accommodating groove of the pawl and is in direct contact fit with the pawl, so that the locking and unlocking functions can be realized, the number of parts is reduced, the weight of an assembly is effectively reduced, and the investment and the manufacturing cost of a mold are reduced.

Description

Manual turnover device for automobile seat backrest and automobile seat

Technical Field

The invention relates to a vehicle seat, in particular to a manual folding device for a vehicle seat backrest and a vehicle seat.

Background

At present, a manual backrest folding device for an automobile seat realizes the functions of locking and unlocking through a four-bar structure, the number of parts is large, and the weight of an assembly is large. The known manual backrest folding device B ' is generally externally arranged, that is, both the backrest folding device B ' and the angle adjuster a ' are arranged outside the framework C ', as shown in fig. 11, the transverse dimensions of the backrest folding device and the angle adjuster a ' are overlapped together, so that the overall size of the whole chair is large, and the arrangement of the folding device in the overall chair is not facilitated. When the folding device is turned on, the seat back is folded, the folding device is in an unlocked state, the regulation requires that the seat state of a user is prompted in a striking mode, and an indicator is generally used for achieving the function. In the prior art, the unlocking handle or the pull belt is released by a user, so that the indicator is restored to the locking state from the unlocking state, and the condition that the prompt message is wrong occurs.

Disclosure of Invention

In order to solve the problems of heavy assembly weight and the like of the manual backrest folding device in the prior art, the invention provides a manual folding device for an automobile seat backrest and an automobile seat.

The invention provides a manual turnover device for a car seat backrest, which comprises a locking claw, a bottom plate, a pawl and a cam, wherein the locking claw is provided with a protruding part protruding outwards in the radial direction, the bottom plate can rotate around a first axis of the locking claw, the pawl is rotatably arranged on the bottom plate around a second axis parallel to the first axis and is provided with a containing groove, the cam is rotatably arranged on the bottom plate around a third axis parallel to the first axis and is provided with a self-locking part, the self-locking part is contained in the containing groove and is directly contacted and matched with the pawl, and the pawl acts on the protruding part to limit a falling locking state.

Preferably, the self-locking portion has an arcuate self-locking face and the pawl has a pawl face, the arcuate self-locking face and the pawl face forming a wedge-shaped structure to define the locked condition.

Preferably, the self-locking part is meshed with the pawl at a meshing point, the arc-shaped self-locking surface is provided with an arc circle center, the third axis defines a rotation center, and an included angle between a first connecting line connecting the meshing point and the arc circle center and a second connecting line connecting the meshing point and the rotation center is 0-10 degrees.

Preferably, the pawl includes a base, a first leg and a second leg, wherein the pawl is rotatably mounted on the base plate by a second axis of the base, the first and second legs respectively projecting radially outwardly from the base to define a receiving slot therebetween, the second leg being in contact engagement with the projection in the drop-lock condition.

Preferably, the base is rotatably mounted on the base plate by an eccentric rivet.

Preferably, the manual turnover device further comprises an elastic piece which is provided with a flat plate part, a bent part and a free end, wherein the elastic piece is fixedly connected to the bottom plate through the flat plate part, the free end is connected to the flat plate part through the bent part and is suspended, the protruding part presses the free end to enable the free end to be attached to the bottom plate in a falling locking state, and the free end acts on the pawl after being separated from the restraint of the protruding part to provide the error-proofing effect of the indicator.

Preferably, the bent portion is installed through the bottom plate such that the flat plate portion and the free end are located at both sides of the bottom plate, respectively.

Preferably, the manual turnover device further comprises a torsion spring which is connected between the bottom plate and the cam so as to enable the self-locking part to be in direct contact fit with the pawl by acting torque on the cam in a falling locking state.

Preferably, the manual turnover device further comprises a stop for limiting pivotal movement of the base plate about the first axis, mounted on the base plate to abut the projection.

Preferably, the stop is an eccentric rivet.

Preferably, the base plate comprises a base plate and a closed flange projecting around the entire circumferential outer contour of the base plate.

Preferably, the manual folding device further includes an unlocking rivet connected to the unlocking handle or the pull strap, which is fixedly installed on the cam to drive the cam by an external force acting on the unlocking handle or the pull strap.

Preferably, the manual turnover device further comprises a cover which is fixedly mounted on the bottom plate so that the pawl and the cam are both accommodated between the bottom plate and the cover.

Preferably, the cover cap is provided with a curved slot for the unlocking rivet to pass through, and the manual turnover device further comprises a protection plate covering the curved slot.

Preferably, the manual turnover device further comprises a gasket disposed between the base plate and the locking claw for eliminating abnormal noise.

The invention also provides an automobile seat which comprises the manual turnover device.

Preferably, the automobile seat further comprises a backrest, a seat and an angle adjuster, wherein the backrest is provided with a framework, the seat is fixedly connected with the lower connecting plate, the angle adjuster is fixed on the lower connecting plate at the outer side of the framework, the manual turnover device is installed at the inner side of the framework, and a locking claw of the manual turnover device penetrates through the bottom plate and is fixedly connected with the angle adjuster to limit a first axis through the rotating center of the angle adjuster.

Preferably, the locking pawl has a base ring and a flange, wherein the flange extends from the base ring and is fixedly connected to the recliner through the base plate, and the projection is a radially outward projection of the base ring.

According to the manual turnover device for the automobile seat backrest, the self-locking part of the cam is accommodated in the accommodating groove of the pawl and is in direct contact fit with the pawl, so that the locking and unlocking functions can be realized, the number of parts is reduced, the weight of an assembly is effectively reduced, and meanwhile, the investment of a mold and the manufacturing cost are reduced. In particular, according to the manual folding device of the present invention, the independent locking claws are arranged on the opposite sides of the recliner, i.e., built inside the frame, so that the entire transverse dimension is not occupied, and the transverse dimension problem of the folding device of the prior art is solved. In addition, according to the manual turnover device, the overall strength of the turnover device is effectively improved through the turnup sealing structure of the bottom plate with lighter weight, and the problems of high strength and light weight of the turnover device in the prior art are solved. Furthermore, according to the manual turnover device, the pawl is clamped by the additionally arranged elastic sheet, so that the manual turnover device is prevented from falling off, and the problem of error prevention of the indicator information of the turnover device in the prior art is solved.

Drawings

FIG. 1A illustrates an installation environment of a manual turnover device for a car seat back according to a preferred embodiment of the present invention;

FIG. 1B is a cross-sectional view of the manual turnover mechanism of FIG. 1A;

FIG. 2 is an exploded view of the manual turnover device of FIG. 1A;

FIG. 3 is a schematic structural view of the base plate of FIG. 2;

FIG. 4 is a schematic structural view of the pawl of FIG. 2;

FIG. 5 is a schematic view of the cam of FIG. 2;

FIG. 6 is a side view of the manual turnover device of FIG. 1A, shown in a locked down condition;

FIG. 7 is an enlarged view of a portion of FIG. 6;

FIG. 8 is a side view of the manual turnover device of FIG. 1A, shown in an unlocked state;

FIG. 9 is a side view of the manual folding apparatus of FIG. 1A, shown in a folded condition;

fig. 10 shows the state of the dome of fig. 9;

fig. 11 shows an installation environment of the manual turnover device of the prior art.

Detailed Description

The following description of the preferred embodiments of the present invention is provided in conjunction with the accompanying drawings and will be described in detail.

It is known that car seats have a backrest and a seat, between which a recliner a and a manual folding device B for the backrest of the car seat according to a preferred embodiment of the invention are mounted to enable the pivoting adjustment of the backrest with respect to the seat. Referring to fig. 1A, the backrest has a frame C, a lower connecting plate D is fixedly connected with the seat, the angle adjuster a is welded and fixed on the lower connecting plate D at the right side (outer side) of the frame C, and the manual folding device B according to the present invention is installed at the left side (inner side) of the frame C, so that the angle adjuster a and the manual folding device B are respectively installed at the opposite sides of the frame C, the transverse dimension is small, the size of the whole chair is reduced, and the arrangement of the folding device in the whole chair is facilitated.

As shown in fig. 2, the manual folding device B includes a bottom plate 1, which serves as a bearing base for other components and is welded and fixed to the inner side of the framework C (see fig. 1A), so that the occupation of the manual folding device B on the transverse dimension is effectively reduced by the way of being built into the inner side of the framework C. Specifically, as shown in fig. 3, the base plate 1 comprises a base plate 1a and a flange 1b, wherein the flange 1b is a closed flange that projects laterally around the entire circumferential contour of the base plate 1 a. In fact, the manual folding device B has the same strength requirement as the angle adjuster a, and the base plate in the prior art has a larger thickness under the high strength requirement, which brings about the defect that the product has a large mass and does not meet the requirement of light weight of automobile products. According to the manual turnover device B, the torsion resistance of the bottom plate 1 is enhanced through the turned edge 1B which is closed in the circumferential direction, the structural strength is effectively improved under the condition that the material thickness is not increased, the thickness of the base plate 1a is smaller, and meanwhile, the high strength and the light weight are considered.

Returning to fig. 2, the manual folding device B further comprises a locking claw 2 having a base ring 2a and a flange 2B, wherein the flange 2B extends laterally from the base ring 2a and is welded and fixed to a recliner a (see fig. 1A) through a first through hole 11 of the base plate 1, the center of rotation of the recliner a defining a first axis about which the base plate 1 is rotatable. In particular, the base ring 2a has a projection 21 projecting radially outwards on its circular basic shape as a functional geometry, the base ring 2a providing a slotted space 2a1 (see fig. 1B) in which the unlocking mechanism (i.e. the pawl 5 and the cam 6, discussed in detail below) is free to pivot; the locking claws 2 are arranged on the side surface of the bottom plate 1, the material thickness on the side of the groove-shaped space is large, the structure is strong, and the strength requirement can be met. Compared with the design of directly integrating the protruding part on the gear ring of the angle adjuster A, the locking claw 2 with the protruding part 21 is independently arranged on the inner side of the framework C opposite to the angle adjuster A, and the angle adjuster A on the market does not need to be designed in any structure, so that the huge cost such as mold opening and the like caused by the structural adjustment of the angle adjuster A on the market is omitted. In addition, the manual folding device B further includes a spacer 2c disposed between the flange 2B and the first through hole 11 to eliminate noise generated by friction between the two metal members (i.e., the base plate 1 and the locking claws 2).

As shown in fig. 2, the manual folding device B further includes a resilient sheet 3 having a flat portion 31, a bent portion 32 and a free end 33, wherein the flat portion 31 is fixedly connected to the outer side of the bottom plate 1 by a fastener due to space limitation, the bent portion 32 is installed through the second through hole 12 of the bottom plate 1, and the free end 33 is connected to the flat portion 31 by the bent portion 32 and extends into the inner side of the bottom plate 1 to be suspended (see fig. 10).

As shown in fig. 2, the manual turnover device B further includes a first eccentric rivet 4 installed through the third through hole 13 of the base plate 1. When the base plate 1 is rotated around the first axis, i.e. the centre of rotation of the recliner a, the first eccentric rivet 4 runs against the projection 21 of the locking claw 2 (see fig. 6). In this way, the first eccentric rivet 4 acts as a stop, for example in the event of a crash, to limit the pivoting movement of the base plate 1.

As shown in fig. 2, the manual turnover device B further includes a pawl 5, and as shown in fig. 4, the pawl 5 includes a base 51, a first leg 52 and a second leg 53, wherein the pawl 5 is rotatably mounted on the base plate 1 through the base 51, the first leg 52 and the second leg 53 respectively project radially outward from the base 51 to define a receiving groove 54 therebetween, and the second leg 53 cooperates with the projection 21 of the locking claw 2 to lock the locking claw 2 (see fig. 6) to define a falling lock state. Returning to fig. 2, the manual turnover device B further includes a second eccentric rivet 5a for defining a second axis, which is respectively installed through the base 51 of the pawl 5 and the fourth through hole 14 of the base plate 1, so that the pawl 5 is rotatably installed on the base plate 1 about a second axis parallel to the first axis.

As shown in fig. 2, the manual turnover device B further includes a cam 6, and as shown in fig. 5, the cam 6 includes a mounting portion 61 and a self-locking portion 62, which are oppositely disposed, wherein the cam 6 is rotatably mounted on the base plate 1 through the mounting portion 61, and the self-locking portion 62 is accommodated in the accommodating groove 54 to be directly contacted and matched with the pawl 5 (see fig. 6) to define a locking state. Compared with a four-bar linkage structure with the same function, the invention omits a coupling rod which is pivotally connected between the pawl and the cam, and the falling locking and unlocking functions can be realized through the matching of the self-locking part 62 of the cam 6 and the pawl 5, thereby reducing the number of parts and effectively reducing the weight of the assembly. Returning to fig. 2, the manual turnover device B further includes a mounting rivet 6a for defining a third axis, which is respectively mounted through the mounting portion 61 of the cam 6 and the fifth through hole 15 of the base plate 1, so that the cam 6 is rotatably mounted on the base plate 1 about a third axis parallel to the first axis. In addition, as shown in fig. 2, the manual turnover device B further includes an unlocking rivet 6B fixedly mounted at the end of the self-locking portion 62 of the cam 6 far from the mounting portion 61 and connected to an unlocking handle or a pull strap, and an external force is applied to the unlocking handle or the pull strap to drive the cam 6 to rotate around the third axis. Further, as shown in fig. 2, the manual folding device B further includes a torsion spring 6c connected between the base plate 1 and the cam 6 to act on the cam 6 by a torque to make the self-locking portion 62 thereof abut against the second leg portion 53 of the pawl 5 (see fig. 6).

As shown in fig. 2, the manual folding device B further includes a cover 7 which is fixedly mounted on the bottom plate 1 so that the pawl 5 and the cam 6 are accommodated between the bottom plate 1 and the cover 7 for protection. In particular, the cover 7 has a curved slot 71 for the unlocking rivet 6B to pass through, and the manual folding device B further includes a protection plate 7a covering the curved slot 71 for dust protection.

As shown in fig. 6, in the lock-down state, the cam 6 abuts against the second leg 53 of the pawl 5 with the self-locking portion 62 by the torsion spring 6c, and the opposite ends of the projection 21 of the locking claw 2 abut against the second leg 53 and the first eccentric rivet 4, respectively. At this time, the free end 33 (see fig. 10) of the leaf spring 3 is pressed by the projection 21 of the pawl 2 to be in a compressed state in close contact with the base plate 1. Specifically, as shown in fig. 7, the self-locking portion 62 has an arc-shaped self-locking surface 621, and the second leg portion 53 has a pawl surface 531, which are formed in a wedge-shaped structure to achieve the above-described lock-down function. Specifically, the self-locking portion 62 is engaged with the second leg portion 53 at a point E, an arc center N of the arc-shaped self-locking surface 621 is not coincident with a center (i.e., a rotation center) M of the mounting rivet 6a, that is, the arc-shaped self-locking surface 621 is designed to be an eccentric arc relative to the rotation center, and a range of an angle θ, which is n.m, is preferably 0 to 10 °.

An external force is applied to the release handle or strap to overcome the force of the torsion spring 6c and drive the cam 6 to rotate clockwise about the attachment rivet 6a such that the self-locking portion 62 of the cam 6 clears the second leg 53 of the pawl 5 and acts on the first leg 52 of the pawl 5 to drive the pawl 5 to rotate counterclockwise about the second eccentric rivet 5a to the release position, releasing the locking relationship with the pawl 2, as shown in figure 8.

After unlocking, the bottom plate 1 can bring the backrest fixedly connected with the bottom plate by welding to turn forwards along the arrow M direction, as shown in fig. 9. At this time, the free end 33 of the elastic sheet 3 is bounced after being separated from the protruding portion 21 of the locking claw 2, and the pawl 5 which rotates to the unlocking position is clamped, referring to fig. 10, so that the pawl does not fall off, the cam 6 and the unlocking rivet 6b are prevented from returning to the unlocking position, the unlocking handle or the pull belt connected with the unlocking rivet 6b keeps the unlocking position unchanged, the indicator prompt information also keeps the unlocking state unchanged, and the indicator prompt information is consistent with the current state, and therefore the error prevention effect of the indicator is achieved.

The above embodiments are merely preferred embodiments of the present invention, which are not intended to limit the scope of the present invention, and various changes may be made in the above embodiments of the present invention. All simple and equivalent changes and modifications made according to the claims and the content of the specification of the present application fall within the scope of the claims of the present patent application. The invention has not been described in detail in the conventional technical content.

Claims

1. A manual turnover device for a car seat backrest is characterized by comprising a locking claw, a bottom plate, a pawl and a cam, wherein the locking claw (2) is provided with a protruding part (21) protruding outwards in a radial direction, the bottom plate (1) is rotatable around a first axis of the locking claw (2), the pawl (5) is rotatably arranged on the bottom plate (1) around a second axis parallel to the first axis and is provided with a containing groove (54), the cam (6) is rotatably arranged on the bottom plate (1) around a third axis parallel to the first axis and is provided with a self-locking part (62), the self-locking part (62) is contained in the containing groove (54) and is directly contacted and matched with the pawl (5), and the pawl (5) acts on the protruding part (21) to limit a falling and locking state, the manual turnover device further comprises an elastic sheet (3) which is provided with a flat plate part (31), a bent part (32) and a free end (33), the elastic sheet (3) is fixedly connected to the bottom plate (1) through the flat plate part (31), the free end (33) is connected to the flat plate part (31) through the bending part (32) and is suspended, the protruding part (21) presses down the free end (33) in a locking state to enable the free end to be attached to the bottom plate (1), and the free end (33) acts on the pawl (5) after being separated from the restraint of the protruding part (21) to provide the error-proofing effect of the indicator.

2. The manual turn-over device of claim 1, characterized in that the self-locking portion (62) has an arc-shaped self-locking surface (621), the pawl (5) has a pawl surface (531), and the arc-shaped self-locking surface (621) and the pawl surface (531) form a wedge structure to define the lock-down state.

3. The manual turnover device according to claim 2, wherein the self-locking portion (62) is engaged with the pawl (5) at an engagement point (E), the arc-shaped self-locking surface (621) has an arc center (N), the third axis defines a rotation center (M), and an included angle between a first line connecting the engagement point (E) and the arc center (N) and a second line connecting the engagement point (E) and the rotation center (M) is 0-10 °.

4. The manual turnover device of claim 1, wherein the pawl (5) includes a base (51), a first leg (52) and a second leg (53), wherein the pawl (5) is rotatably mounted on the base plate (1) via a second axis of the base (51), the first leg (52) and the second leg (53) each project radially outward from the base (51) to define a receiving slot (54) therebetween, and the second leg (53) is in contact engagement with the projection (21) in the locked state.

5. Manual turnover device according to claim 4, characterised in that the base (51) is rotatably mounted on the base plate (1) by means of an eccentric rivet.

6. Manual turnover device according to claim 1, characterised in that the bent portion (32) is mounted through the base plate (1) so that the flat plate portion (31) and the free end (33) are located on either side of the base plate (1).

7. The manual turn-over device according to claim 1, further comprising a torsion spring (6 c) connected between the base plate (1) and the cam (6) to act on the cam (6) by a torque in a locked state to bring the self-locking portion (62) thereof into direct contact engagement with the pawl (5).

8. The manual turnover device of claim 1, further comprising a stop for limiting the pivotal movement of the base plate (1) about the first axis, mounted on the base plate (1) to abut against the projection (21).

9. The manual folding apparatus of claim 8 wherein the stop member is an eccentric rivet.

10. Manual turnover device according to claim 1, characterised in that the bottom panel (1) comprises a base panel (1 a) and a closed flap (1 b) projecting around the entire circumferential outer contour of the base panel (1 a).

11. The manual turnover device of claim 1, further comprising an unlocking rivet (6 b) connected to the unlocking handle or the drawstring, which is fixedly installed on the cam (6) to drive the cam (6) by an external force acting on the unlocking handle or the drawstring.

12. The manual turnover device of claim 11, further comprising a cover (7) fixedly mounted on the base plate (1) such that the pawl (5) and the cam (6) are both received between the base plate (1) and the cover (7).

13. The manual turnover device of claim 12, wherein the cover (7) has a curved groove (71) for passing the unlocking rivet (6 b), and the manual turnover device further comprises a protection plate (7 a) covering the curved groove (71).

14. The manual turnover device of claim 1, further comprising a spacer (2 c) disposed between the base plate (1) and the locking claw (2) for eliminating abnormal noise.

15. A car seat comprising a manual turnover device according to any one of claims 1-14.

16. The car seat according to claim 15, characterized in that the car seat further comprises a backrest, a seat and a recliner (a), wherein the backrest has a frame (C), the seat is fixedly connected with a lower connecting plate (D), the recliner (a) is fixed on the lower connecting plate (D) at the outer side of the frame (C), and a manual folding device (B) is installed at the inner side of the frame (C), wherein a locking claw (2) of the manual folding device (B) passes through the bottom plate (1) and is fixedly connected with the recliner (a) to define a first axis through the rotation center of the recliner (a).

17. The vehicle seat according to claim 16, characterized in that the locking pawl (2) has a base ring (2 a) and a flange (2 b), wherein the flange (2 b) projects from the base ring (2 a) and is fixedly connected to the recliner (a) through the base plate (1), and the projection (21) is a radially outward projection of the base ring (2 a).