Vehicle seat

Abstract

To suppress friction between a strap and a pad.SOLUTION: A seat for vehicle comprises: a seat back S1 which has a seat back frame 30; a lock device 20 which is fixed to the seat back frame 30 for locking a vehicle body to the seat back frame 30 and has an operation member 21 that releases lock by being pulled upward; a strap 10 for pulling up the operation member 21; and a first wire bracket 40 which is fixed to the seat back frame 30. The first wire bracket 40 comprises: a strap engagement part 41A which is engaged with one end of the strap 10; and a movement regulation part 43 which extends in a direction intersecting a vertical direction and can restrict a pulling operation amount of the strap 10. The movement regulation part 43 is located on a rear side relative to the strap engagement part 41A.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a vehicle seat having a locking device that can lock or unlock the seat to the vehicle body. In the basket Related.

Background Art

[0002] Vehicle seats are often configured to be movable so that the layout can be changed according to the purpose of use. And, in order to release the lock of the locking device that locks the seat to the vehicle body, there is a configuration in which a strap (belt) is connected to the lever of the locking device and one end of the strap is exposed outside the seat.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, depending on the structure of the locking device, a large force may be required to pull the strap, and it may be difficult to perform the unlocking operation.

[0005] Therefore, an object is to reduce the load on the strap for releasing the lock of the locking device. Another object is to suppress rubbing between the strap and the pad. Another object is to suppress failure of the locking device. Another object is to improve the rigidity of the vehicle seat. Another object is to facilitate the manufacture of the seat back frame. Another object is to enhance the durability of the strap. Another object is to improve the operability of the locking device.

Means for Solving the Problem

[0006] The vehicle seat includes a seat back having a seat back frame, a locking device fixed to the seat back frame for locking the seat back frame to the vehicle body, the locking device having an operating member that is unlocked by being pulled upward, and a strap for pulling up the operating member. The seat back frame is provided with a strap engaging portion where one end of the strap engages. The operating member has an operating engaging portion located below the strap engaging portion. The strap has a frame engaging portion that engages with the strap engaging portion and a gripping portion that is exposed outside the seat back from the outlet at the upper part of the seat back. The strap extends upward from the frame engaging portion through the lower side of the operating engaging portion toward the gripping portion and engages with the operating engaging portion so as to be able to pull up the operating engaging portion.

[0007] According to such a configuration, when the gripping portion is pulled, the portion of the strap stretched between the operating engaging portion and the strap engaging portion and the portion of the strap stretched from the operating engaging portion toward the gripping portion both pull up the operating engaging portion upward. Therefore, the operating engaging portion can be pulled up with a force approximately twice the tension of the strap, and the load on the strap for releasing the lock of the locking device can be reduced.

[0008] The above-described vehicle seat can be provided with a pad on the front side of the strap. And it is desirable that the portion extending from the lower side of the operating engaging portion to the gripping portion is located behind the portion extending from the frame engaging portion to the lower side of the operating engaging portion.

[0009] When the gripping portion is pulled, the portion extending from the lower side of the operating engaging portion to the gripping portion moves up and down. According to this configuration, since this portion that moves up and down is behind the portion extending from the frame engaging portion to the lower side of the operating engaging portion, it is possible to suppress rubbing between the strap and the pad in front of the strap. Thereby, damage to the pad can be suppressed.

[0010] The above-described vehicle seat can include a movement restricting portion fixed to the seat back frame and extending in a direction intersecting the vertical direction. And the strap can be made of a belt, and the belt can be folded and overlapped, and can have a joint portion where the overlapped portions are joined to each other. The movement restricting portion is preferably disposed between a plurality of belts above the joint portion and can engage with the joint portion to limit the amount of pulling operation of the gripping portion when the gripping portion is pulled.

[0011] According to such a configuration, since the joint portion engages with the movement restricting portion, the amount of pulling operation of the gripping portion can be limited, so that it is possible to suppress the failure of the locking device.

[0012] In this case, the joint portion may be such that a plurality of belts are joined by sewing.

[0013] According to such a configuration, the joint portion can be strengthened by sewing.

[0014] The movement restricting portion may be located behind the strap engaging portion. And it is desirable that the strap is bent so as to protrude backward at the portion in contact with the movement restricting portion.

[0015] According to such a configuration, it is difficult for the strap to contact the pad on the front side of the strap.

[0016] The vehicle seat can further include a first wire bracket formed by bending a wire and fixed to the seat back frame. The first wire bracket is a first U-shaped portion opening upward, and can have a first U-shaped portion whose lower end portion is the strap engaging portion, and the movement restricting portion extending in a direction intersecting the vertical direction from one upper end of the first U-shaped portion.

[0017] In addition, the vehicle seat can further include a second wire bracket formed by bending a wire and fixed to the seat back frame, and the second wire bracket can be in a U-shaped configuration that opens downward. The first wire bracket has a second U-shaped portion that opens downward, and the second U-shaped portion has an upper edge portion and a pair of downward extending portions that extend downward from both left and right end portions of the upper edge portion. Each of the pair of lower end portions of the second wire bracket is fixed to each of the pair of downward extending portions of the second U-shaped portion, and the strap can be configured to pass between the second U-shaped portion and the second wire bracket.

[0018] The above-described vehicle seat can further include a third wire bracket formed of an annular wire fixed to both the second U-shaped portion and the second wire bracket. The strap may pass through the annulus of the third wire bracket.

[0019] According to this, the third wire bracket can increase the rigidity of the portion of the seat back frame from which the strap is drawn out.

[0020] The vehicle seat can have a through hole and further include a plastic cover fixed to the third wire bracket. The strap may be configured to pass through the through hole of the plastic cover.

[0021] One of the pair of downward extending portions may be connected to the other upper end of the first U-shaped portion. And it is desirable that the first wire bracket has a spiral shape when viewed from the front.

[0022] According to such a configuration, it is possible to manufacture the first wire bracket from a single wire. That is, it is possible to facilitate the manufacture of the seat back frame.

[0023] The strap may be made of a belt. One end of the strap is formed into a loop shape by folding and joining the belt, and the loop-shaped portion of the one end constitutes a frame engaging portion. The other end of the strap may be formed into a loop shape by folding and joining the belt, and the loop-shaped portion of the other end may constitute a gripping portion.

[0024] Also, it is desirable that the overlapping portion where the belt is folded at one end of the strap engages with the operation engaging portion.

[0025] By engaging the overlapping portion where the belt overlaps with the operation engaging portion in this way, the durability of the strap can be enhanced.

[0026] The length of the overlapping portion where the belt at the other end of the strap is folded and overlapped may be longer than the length of the overlapping portion where the belt at the one end is folded and overlapped.

[0027] The locking device may have a housing. The base portion extending from the housing of the operation member is located at a position different from the operation engaging portion with which the strap engages in the left-right direction, and the range where the lead-out port is arranged and the range where the operation engaging portion is arranged may overlap in the left-right direction.

[0028] According to such a configuration, even if the base portion of the operation member is displaced left and right from the lead-out port of the strap, since the lead-out port and the operation engaging portion are in the overlapping range in the left-right direction, it is easy to pull the strap straight up. That is, the operability of the locking device can be improved.

Advantages of the Invention

[0029] The load of the strap for releasing the lock of the locking device can be reduced.

[0030] In addition, since the part of the strap that moves above and below is located behind the part that extends from the frame engagement part to the lower side of the operation engagement part, rubbing between the strap and the pad in front of the strap can be suppressed.

[0031] In addition, since the amount of pulling operation of the gripping part can be restricted by the engagement of the joint part with the movement restricting part, it is possible to suppress the failure of the locking device.

[0032] In addition, by configuring the joint part by sewing, the joint part can be strengthened.

[0033] In addition, since the strap is bent so as to protrude backward at the part where it contacts the movement restricting part, the strap is less likely to contact the pad on the front side of the strap.

[0034] In addition, by fixing the third wire bracket to both the second U-shaped part and the second wire bracket, the rigidity of the part of the seat back frame where the strap is pulled out can be increased.

[0035] In addition, one of the pair of downward extending parts is connected to the other upper end of the first U-shaped part, and since the first wire bracket has a spiral shape when viewed from the front, the first wire bracket can be manufactured from a single wire. That is, it is possible to facilitate the manufacture of the seat back frame.

[0036] In addition, since the part where the belts overlap engages with the operation engagement part, the durability of the strap can be increased.

[0037] In addition, even if the base of the operation member is displaced left and right from the strap outlet, since the outlet and the operation engagement part are within the overlapping range in the left-right direction, it is easy to pull the strap straight up. That is, the operability of the locking device can be improved.

Brief Description of the Drawings

[0038]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Mode for Carrying Out the Invention

[0039] Next, embodiments of the present invention will be described in detail with reference to the drawings as appropriate. As shown in FIG. 1, the vehicle seat S according to the embodiment is, for example, a seat used for a rear seat of an automobile, and includes a seat back S1, a seat cushion S2, a headrest S3, and an armrest S4.

[0040] The seat back S1 has a seat back frame 30 as shown in FIGS. 2 and 3. And as shown in FIG. 4, a pad P is covered on the seat back frame 30, and a skin 81 is further covered on the pad P. Similarly, the seat cushion S2, the headrest S3, and the armrest S4 are also configured to have a frame, a pad, and a skin (not shown). The pad P has a front pad P1 located on the front side of the seat back frame 30 and a rear pad P2 located on the rear side of the seat back frame 30. The front pad P1 is located on the front side of the strap 10.

[0041] Also, as shown in FIG. 1, the vehicle seat S includes a locking device 20 for locking the seat back frame 30 to the vehicle body 90, and a strap 10 for operating when unlocking the locking device 20.

[0042] A striker 95 made of a U-shaped wire is fixed to the vehicle body 90. The locking device 20 has a rotatable latch 25 (see FIG. 4), and when the latch 25 engages with the striker 95, the seat back S1 can be locked so as not to move relative to the vehicle body 90.

[0043] The locking device 20 is fixed to the seat back frame 30 (see FIG. 2). The locking device 20 has an operating member 21 that is unlocked by being pulled upward. On the other hand, the seat back frame 30 is provided with a strap engaging portion 41A with which one end of the strap 10 engages. And the operating member 21 has an operating engaging portion 21B located below the strap engaging portion 41A. The strap 10 has a frame engaging portion 12 that engages with the strap engaging portion 41A and a gripping portion 11 that is exposed outside the seat back S1 from the upper draw-out port S11 of the seat back S1. And the strap 10 extends upward from the frame engaging portion 12 through the lower side of the operating engaging portion 21B toward the gripping portion 11 and engages with the operating engaging portion 21B so as to be able to pull up the operating engaging portion 21B.

[0044] As shown in FIGS. 2 and 3, the seat back frame 30 mainly includes a pipe frame 31, a pan frame 32, and a headrest bracket 33. The pipe frame 31 is a frame formed by bending a pipe, and has a pair of side frames 31A extending in the vertical direction (only one is shown in FIG. 2) and an upper frame 31B connecting the upper ends of the pair of side frames 31A. The headrest brackets 33 are fixed to the upper frame 31B in pairs according to each seat. In this specification, up and down, left and right, and front and back are based on the vehicle seat S in a state where the seat back S1 is locked to the vehicle body 90. Also, the inner and outer sides in the left-right direction are based on the vehicle seat S, not the vehicle body 90.

[0045] The pan frame 32 is a frame made of a metal plate, which is disposed behind the pipe frame 31 and fixed to the pipe frame 31 by welding or the like. The pan frame 32 has a plurality of punching holes 32H for weight reduction.

[0046] The seat back frame 30 includes a first wire bracket 40, a second wire bracket 52, a third wire bracket 53, a fourth wire bracket 54, and a plastic cover 55.

[0047] The first wire bracket 40 is formed by bending a wire and is fixed to the seat back frame 30. The first wire bracket 40 has a first U-shaped portion 41 that opens upward, a second U-shaped portion 42 that opens downward, and a movement restricting portion 43 fixed to the seat back frame 30.

[0048] The first U-shaped portion 41 has a strap engaging portion 41A that is a lower end portion extending in the left-right direction, a first upward extending portion 41B that extends upward from the left and right inner ends of the strap engaging portion 41A, a second upward extending portion 41C that extends upward from the left and right outer ends of the strap engaging portion 41A, and an inclined portion 41D that extends obliquely left and right and upward from the upper end of the first upward extending portion 41B.

[0049] In this embodiment, the strap engaging portion 41A extends horizontally left and right, but it may be slightly inclined. Also, in this embodiment, the strap engaging portion 41A has a linear shape, but it may have a semi-circular shape that opens upward. The strap engaging portion 41A is disposed at a position spaced apart from the pipe frame 31 and the pan frame 32, keeping a space therebetween. From the upper end of the second upward extension part 41C, which is one of the upper ends of the first U-shaped part 41, a movement restricting part 43 extends in a direction intersecting the vertical direction. The movement restricting part 43 is arranged at a position keeping a space away from the pipe frame 31 and the pan frame 32. In the present embodiment, the movement restricting part 43 extends horizontally left and right, but it may extend obliquely with respect to the horizontal direction, or may extend in the front-rear direction when the flat surface of the strap 10 faces the left-right direction.

[0050] The second U-shaped part 42 has an upper edge part 42A extending in the left-right direction, a first downward extension part 42B extending downward from the left and right inner ends of the upper edge part 42A, a second downward extension part 42C extending downward from the left and right outer ends of the upper edge part 42A, and a fixing part 42D extending inward in the left-right direction from the lower end of the second downward extension part 42C. The first downward extension part 42B and the second downward extension part 42C are examples of a pair of downward extension parts.

[0051] One of the pair of downward extension parts, the first downward extension part 42B, is connected to an inclined part 41D, which is the other upper end of the first U-shaped part 41. Thereby, the first wire bracket 40 has a spiral shape extending clockwise from the inside to the outside when viewed from the front, combining the first U-shaped part 41 and the second U-shaped part 42.

[0052] In the first wire bracket 40, the inclined part 41D, the second downward extension part 42C, and the fixing part 42D are fixed to the seat back frame 30. Specifically, the inclined part 41D is welded to a part extending in an arc shape connecting the side frame 31A and the upper frame 31B of the pipe frame 31. The second downward extension part 42C and the fixing part 42D are welded to the pan frame 32. Although the reference signs are omitted in the drawings, each welded part is indicated by hatching.

[0053] The second wire bracket 52 is formed by bending a wire and is fixed to the seat back frame 30. The second wire bracket 52 is directly fixed to the first wire bracket 40 and is fixed to the seat back frame 30 via the first wire bracket 40.

[0054] Specifically, as shown in FIG. 3, the second wire bracket 52 has an upper edge portion 52A that extends horizontally to the left and right, a first leg portion 52B that extends downward from the left and right inner ends of the upper edge portion 52A, and a second leg portion 52C that extends downward from the left and right outer ends of the upper edge portion 52A. Each of the pair of lower end portions of the second wire bracket 52 is fixed to each of the pair of downward extending portions 42B and 42C of the second U-shaped portion 42. More specifically, the lower end portion of the first leg portion 52B is welded to the upper portion of the first downward extending portion 42B of the second U-shaped portion 42, and the lower end portion of the second leg portion 52C is welded to the upper portion of the second downward extending portion 42C of the second U-shaped portion 42. The second U-shaped portion 42 and the second wire bracket 52 form an annular shape when viewed from above, and the strap 10 passes between the second U-shaped portion 42 and the second wire bracket 52.

[0055] The third wire bracket 53 is made of an annular wire. Specifically, the third wire bracket 53 is made of an oblong wire that is long in the left-right direction. The third wire bracket 53 is fixed to both the second U-shaped portion 42 and the second wire bracket 52. More specifically, the front edge portion of the third wire bracket 53 is fixed to the upper edge portion 42A of the first wire bracket 40 by welding. The rear edge portion of the third wire bracket 53 is fixed to the upper edge portion 52A of the second wire bracket 52 by welding (not shown). The strap 10 passes through the annular shape of the third wire bracket 53.

[0056] The plastic cover 55 has a through hole 55A that penetrates vertically. The plastic cover 55 is fixed to the third wire bracket 53 by engaging with the third wire bracket 53. And the strap 10 passes through the through hole 55A of the plastic cover 55. The through hole 55A serves as the lead-out port S11 of the strap 10.

[0057] The fourth wire bracket 54 is a member for holding the shape of the seat back S1 and is formed by bending a wire. The fourth wire bracket 54 has a front portion 54A, an upper portion 54B extending rearward from the upper end of the front portion 54A, a first fixing portion 54C extending downward from the rear end of the upper portion 54B, a lower portion 54D extending rearward from the lower end of the front portion 54A, and a second fixing portion 54E extending upward from the rear end of the lower portion 54D. The first fixing portion 54C and the second fixing portion 54E are respectively fixed to the second lower extending portion 42C of the first wire bracket 40 by welding.

[0058] Although illustration is omitted, the first wire bracket 40, the second wire bracket 52, the third wire bracket 53, the fourth wire bracket 54, the plastic cover 55, the locking device 20, and the strap 10 are provided approximately symmetrically on the left and right sides of the seat back frame 30.

[0059] As shown in FIG. 6, the fourth wire bracket 54 protrudes forward, and the front portion 54A is located in front of the first wire bracket 40. And it contacts the front pad P1 of the pad P and holds the shape of the front pad P1, specifically, the shape of the left and right ends in the upper part.

[0060] As shown in FIG. 2, the locking device 20 has a housing 20A, and a plurality of components such as a latch 25 are accommodated in the housing 20A. The entire lead-out port S11 is located at a position different from that of the housing 20A of the locking device 20 in the left-right direction, specifically, shifted to the left and right inner sides with respect to the housing 20A.

[0061] The operating member 21 includes a base portion 21A that extends upward from the housing 20A, an operating engagement portion 21B with which the strap 10 engages, a connecting portion 21C that obliquely connects the operating engagement portion 21B and the base portion 21A, and a stopper 21D that is bent downward in a U-turn from the left and right inner ends of the operating engagement portion 21B. The stopper 21D has a function of suppressing the strap 10 engaged with the operating engagement portion 21B from coming off the operating engagement portion 21B. The base portion 21A is located at a position different from that of the operating engagement portion 21B in the left-right direction, specifically, at a position shifted to the left and right outer sides. On the other hand, in the left-right direction, the range L5 where the lead-out port S11 (through hole 55A) is arranged overlaps with the range where the operating engagement portion 21B is arranged.

[0062] Also, in the left-right direction, the range L5 where the lead-out port S11 is arranged overlaps with the range where the strap engagement portion 41A is arranged, and the range L5 where the lead-out port S11 is arranged overlaps with the range where the movement restricting portion 43 is arranged.

[0063] Therefore, the strap 10 can extend straight up and down from the lead-out port S11 to the operating engagement portion 21B and the strap engagement portion 41A without bending left and right.

[0064] As shown in FIGS. 3 and 4, the strap 10 is made of a belt. The strap 10 is, for example, made of a belt made of plastic fibers. The strap 10 is configured by folding and sewing the upper end and the lower end of a single belt backward. The strap 10 includes a front belt B1 that is located on the front side and extends from the upper end to the strap engagement portion 41A, an upper belt B2 that overlaps the rear side of the front belt B1 from the upper end of the front belt B1 and extends downward, and a lower belt B3 that overlaps the front side of the front belt B1 from the end that engages with the strap engagement portion 41A of the front belt B1 and extends downward, and from the portion that engages with the operating engagement portion 21B of the front belt B1, overlaps the rear side of the front belt B1 and extends upward.

[0065] The length of the upper belt B2 (the part where the belts at the other end are folded and overlapped) is longer than the length of the lower belt B3 (the part where the belts at one end are folded and overlapped).

[0066] The lower end, which is one end of the strap 10, is formed into a loop shape by folding and joining the belts. Specifically, at the lower end of the strap 10, the front belt B1 and the lower belt B3 are joined to each other by a stitching portion 110 (see FIG. 4). The loop-shaped portion of this lower end, that is, the portion where the belts are folded and overlapped, constitutes a lock device engaging portion 13 that engages with the operation engaging portion 21B.

[0067] The upper end, which is the other end of the strap 10, is formed into a loop shape by folding and joining the belts. Specifically, the front belt B1 and the upper belt B2 are joined to each other by a stitching portion 120 and a stitching portion 130. As a result, a loop shape is formed at the upper end of the strap 10, and this loop-shaped portion constitutes the gripping portion 11. A plastic rivet 18 is attached to the upper part of the stitching portion 130. The rivet 18 is located on the plastic cover 55. The rivet 18 has a thickness in the front-rear direction that is larger than the dimension in the front-rear direction of the pulling-out port S11, and suppresses the gripping portion 11 from entering the seat back S1 from the pulling-out port S11. Further, the rivet 18 also has a function of reinforcing the stitching portion 130.

[0068] In the stitching portion 120, the front belt B1 and the upper belt B2 are stitched over a predetermined length in the longitudinal direction of the strap 10.

[0069] The stitching portion 130 is disposed at a predetermined distance above the stitching portion 120. The stitching portion 130 is longer vertically compared to the stitching portion 120. In the stitching portion 130, the front belt B1 and the upper belt B2 are stitched over a predetermined length in the longitudinal direction of the strap 10. Specifically, the stitching portion 130 includes a first stitching portion 131 extending in the longitudinal direction of the strap 10 at both left and right edges of the belt, and a second stitching portion extending so as to connect the lower ends of the first stitching portions 131 in the width direction of the belt 132 and a third stitching portion extending so as to connect the upper ends of the first stitching portions 131 in the width direction of the belt 133 Thereby, the stitching portion 130 integrates the front belt B1 and the upper belt B2 and gives the strap 10 appropriate rigidity. Since the stitching portion 130 is separated from the stitching portion 120, the portion between the stitching portion 120 and the stitching portion 130 is flat and annular with the front belt B1 and the upper belt B2 not being stitched.

[0070] The stitching portion 120 and the stitching portion 130 are examples of joining portions. The movement restricting portion 43 is disposed between a plurality of belts (the front belt B1 and the upper belt B2) above the stitching portion 120. That is, the movement restricting portion 43 is disposed between the front belt B1 and the upper belt B2 in the portion between the stitching portion 120 and the stitching portion 130. Thereby, when the gripping portion 11 is pulled, the movement restricting portion 43 can engage with the stitching portion 120 to limit the pulling operation amount of the gripping portion 11.

[0071] The portion extending from below the operation engaging portion 21B of the strap 10 to the gripping portion 11 is located behind the portion extending from the frame engaging portion 12 to below the operation engaging portion 21B. The strap engaging portion 41A is slightly separated rearward from the front pad P1. Also, the portion of the strap 10 extending from the frame engaging portion 12 toward below the operation engaging portion 21B is slightly separated rearward from the front pad P1. Further, since the portion extending from below the operation engaging portion 21B of the strap 10 to the gripping portion 11 is located behind the portion extending from the frame engaging portion 12 to below the operation engaging portion 21B, it is relatively far behind from the front pad P1.

[0072] The movement restricting portion 43 is located behind the strap engaging portion 41A. And the strap 10 is bent so as to protrude rearward at the portion contacting the movement restricting portion 43.

[0073] When assembling the vehicle seat S configured as described above, when assembling the strap 10, the loop at the lower end of the strap 10 before attaching the rivet 18 is hung on the strap engaging portion 41A of the first wire bracket 40, and the entire strap 10 is passed from front to rear under the operation engaging portion 21B (between the operation engaging portion 21B and the stopper 21D). Then, the gripping portion 11 is pulled upward, and the movement restricting portion 43 is inserted between the two belts between the stitching portion 120 and the stitching portion 130. Further, the gripping portion 11 of the strap 10 is passed from bottom to top through the third wire bracket 53 and the through hole 55A of the plastic cover 55. Then, when the gripping portion 11 of the strap 10 is exposed above the plastic cover 55, the rivet 18 is fastened to the strap 10. Thereby, the strap 10 is prevented from coming off.

[0074] At the time of this assembly, since the strap 10 has the stitching portion 130 stitched along the longitudinal direction, the upper portion of the strap 10 has rigidity and is easily passed through the third wire bracket 53 and the through hole 55A of the plastic cover 55.

[0075] Then, when the gripping portion 11 of the strap 10 is pulled upward from the state where the locking device 20 shown in FIG. 4 is in the locked state, as shown in FIG. 5, the operation member 21 is pulled upward and the latch 25 rotates, and the locking device 20 becomes unlocked. At this time, the striker 95 is disengaged from the latch 25 and at the same time the seat back S1 rotates slightly forward. The strap 10 does not move upward any more because the stitching portion 120 engages with the movement restricting portion 43.

[0076] When the gripping portion 11 is pulled, both the portion of the strap 10 stretched between the operation engagement portion 21B and the strap engagement portion 41A and the portion of the strap 10 stretched from the operation engagement portion 21B toward the gripping portion 11 pull the operation engagement portion 21B upward. Therefore, the operation engagement portion 21B can be pulled upward with a force approximately twice the tension of the strap 10 generated by pulling the gripping portion 11, and the load on the strap 10 for releasing the lock of the locking device 20 can be reduced.

[0077] And when the gripping portion 11 is pulled, the portion of the strap 10 extending from the frame engagement portion 12 to the lower side of the operation engagement portion 21B does not move vertically, and the portion of the strap 10 extending from the lower side of the operation engagement portion 21B to the gripping portion 11 moves vertically. Since this vertically moving portion is behind the portion of the strap 10 extending from the frame engagement portion 12 to the lower side of the operation engagement portion 21B, it is less likely to rub against the front pad P1 in front of the strap 10. Thereby, damage to the pad P can be suppressed. In particular, in the present embodiment, since the strap 10 is bent so as to protrude backward at the portion engaging with the movement restricting portion 43, it is less likely to rub against the front pad P1, and damage to the pad P can be suppressed.

[0078] Also, as shown in FIG. 5, since the stitching portion 120 engages with the movement restricting portion 43, the amount of pulling operation of the gripping portion 11 can be restricted, so that a failure of the locking device 20 due to excessive pulling of the operation member 21 can be suppressed.

[0079] Moreover, the vehicle seat S of the present embodiment can exhibit the following effects. The strap 10 can strengthen the joint portion by sewing the belts together.

[0080] Also, since the third wire bracket 53 is fixed to both the second U-shaped portion 42 and the second wire bracket 52, the rigidity of the portion of the seat back frame 30 from which the strap 10 is pulled out can be increased.

[0081] In addition, the first wire bracket 40 can be manufactured from a single wire, which facilitates the manufacture of the seat back frame 30.

[0082] In addition, since the overlapping portion of the straps 10 engages with the operation engagement portion 21B, the durability of the straps 10 can be enhanced.

[0083] In addition, although the base portion 21A of the operation member 21 is laterally displaced from the strap outlet S11 of the strap 10, since the outlet S11 and the operation engagement portion 21B overlap in the lateral direction, it is easy to pull the strap 10 straight upward. That is, according to the vehicle seat S of the present embodiment, the operability of the locking device 20 can be improved.

[0084] Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments. The specific configuration can be appropriately changed without departing from the spirit of the present invention.

[0085] For example, the material of the strap 10 is not particularly limited, and it may be made of a belt made of a material other than plastic fiber, or may be composed of a string instead of a belt.

[0086] In addition, the configuration of the strap 10 is not limited to that of the embodiment, and for example, it may be manufactured by joining two or more belts. Further, the strap 10 is not limited to a configuration in which two belts are overlapped and joined, and may be a configuration in which three or more belts are overlapped and joined.

[0087] In the above embodiment, the strap engagement portion 41A, the upper edge portion 42A of the second U-shaped portion 42, and the movement restricting portion 43 are configured as one part as the first wire bracket 40, but each part may be configured with separate members.

[0088] In the above embodiment, the strap 10 is joined by sewing the belts, but it may be joined by welding or riveting.

[0089] Also, each element of the above-described embodiments and modifications can be implemented in appropriate combination.

Description of Reference Numerals

[0090] 10 Strap 11 Gripping portion 12 Frame engaging portion 20 Locking device 20A Housing 21 Operating member 21A Base portion 21B Operating engaging portion 30 Seat back frame 40 First wire bracket 41 First U-shaped portion 41A Strap engaging portion 42 Second U-shaped portion 43 Movement restricting portion 52 Second wire bracket 52A Upper edge portion 55 Plastic cover 90 Vehicle body 110 Stitching portion 120 Stitching portion 130 Stitching portion P Pad S Vehicle seat S1 Seat back S11 Outlet SK Skin

Claims

1. a seat back having a seat back frame; a locking device fixed to the seat back frame for locking the seat back frame to a vehicle body, the locking device having an operating member that is unlocked by being pulled upward; A strap for pulling up the operating member, The strap comprises a belt, a first joint portion that joins first portions of the belt, the first portions being overlapped by folding one end of the belt in the longitudinal direction; a second joint portion that joins together second portions of the belts that are overlapped by folding the other end portion in the longitudinal direction; a third joint portion that joins the second portions to each other, the third joint portion being disposed a predetermined distance away from the second joint portion in the longitudinal direction; The vehicle seat, wherein a length of the third joint portion in the longitudinal direction is longer than a length of the second joint portion in the longitudinal direction.

2. The third joint is a first seam extending in the longitudinal direction at both widthwise edges of the belt; A second seam portion extending to connect one ends of the first seams in the width direction; The vehicle seat according to claim 1 , further comprising: a third seam extending so as to connect other ends of the first seams to each other in the width direction.

3. A vehicle seat as described in claim 1 or claim 2, characterized in that the second joint joins the second portions to each other over a predetermined length in the longitudinal direction.

4. The second joint portion is a fourth seam extending in the longitudinal direction at both widthwise edges of the belt; a fifth seam extending to connect one ends of the fourth seams in the width direction; 4. The vehicle seat according to claim 1, further comprising: a sixth seam extending so as to connect other ends of the fourth seams to each other in the width direction.

5. The second joint portion is The fourth stitched portion, the fifth stitched portion, and the sixth stitched portion form a rectangle, 5. The vehicle seat according to claim 4, further comprising a seventh seam extending along a diagonal line of the rectangle.

6. A vehicle seat as described in any one of claims 1 to 5, characterized in that a rivet is attached to the end of the third joint farthest from the second joint in the longitudinal direction.

7. A vehicle seat as described in any one of claims 1 to 6, characterized in that the portion of the second part between the second joint and the third joint is not joined to each other.

8. The seat back frame is provided with a strap engagement portion with which one end of the strap engages, and a movement restriction portion extending in a direction intersecting the up-down direction, The operating member has an operating engagement portion located below the strap engagement portion, The strap is a loop-shaped portion formed between one end of the strap in the longitudinal direction and the first joint portion serves as a frame engaging portion that engages with the strap engaging portion, Extending upward from the frame engaging portion through the lower side of the operation engaging portion, A loop-shaped portion formed between the other end of the strap in the longitudinal direction and the third joint portion serves as a gripping portion exposed to the outside of the seat back through a pull-out opening at the top of the seat back, 8. The vehicle seat according to claim 7, wherein a portion of the second portion between the second joint portion and the third joint portion engages with the movement restricting portion.

9. The strap has a loop-shaped portion formed at an end farther from the second joint than the third joint in the longitudinal direction, which serves as a gripping portion exposed to the outside of the seat back through a pull-out opening at the top of the seat back, The vehicle seat includes a cover having a through hole that penetrates vertically and serves as the withdrawal opening, 7. The vehicle seat according to claim 6, wherein the rivet is located on the cover.

10. A pad that covers the seat back frame; A skin that covers the pad, The seat back frame has a pan frame made of a metal plate, The pad includes a front pad located on a front side of the seat back frame, 10. The vehicle seat according to claim 1, wherein the strap is disposed between the pan frame and the front pad in the front-rear direction of the seat back.

11. A pad that covers the seat back frame; A skin that covers the pad; 11. The vehicle seat according to claim 1, further comprising: a wire bracket formed by bending a wire, the wire bracket contacting the pad from the inside of the seat back to maintain the shape of the seat back.

12. A vehicle seat as described in Claim 11, characterized in that the strap is positioned more inward than the wire bracket in the left-right direction of the seat back.

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