JP7698226B2 - Vehicle seat - Google Patents

Description

The present invention relates to a vehicle seat having a locking device that can be locked and unlocked to the vehicle body.

Vehicle seats are often configured to be movable so that the layout can be changed depending on the purpose of use. To unlock a locking device that locks the seat to the vehicle body, some seats have a strap (belt) connected to a lever of the locking device, with one end of the strap exposed to the outside of the seat.

JP 2015-174470 A

However, depending on the structure of the locking device, a large amount of force may be required to pull the strap, making it difficult to release the lock.

Therefore, an object of the present invention is to reduce the load of the strap for unlocking the locking device.
Another object is to prevent the strap from rubbing against the pad.
Another object of the present invention is to prevent malfunctions of the locking device.
Another object of the present invention is to improve the rigidity of a vehicle seat.
Another object is to make the seat back frame easier to manufacture.
Another object is to increase the durability of the strap.
Another object of the present invention is to improve the operability of the locking device.

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 engagement portion with which one end of the strap is engaged.
The operating member has an operating engagement portion located below the strap engagement portion.
The strap has a frame engagement portion that engages with the strap engagement portion and a grip portion that is exposed to the outside of the seat back through an opening at the top of the seat back, and extends upward from the frame engagement portion, passing under the operation engagement portion toward the grip portion, and engages with the operation engagement portion so that the operation engagement portion can be pulled up.

With this configuration, when the gripping part is pulled, both the part of the strap stretched between the operation engagement part and the strap engagement part, and the part of the strap stretched from the operation engagement part toward the gripping part, pull the operation engagement part upward. This means that the operation engagement part can be pulled up with a force approximately twice the tension of the strap, reducing the load on the strap to unlock the locking device.

The vehicle seat described above may be provided with a pad on the front side of the strap. It is also preferable that the portion extending from the underside of the operation engagement portion to the grip portion is located behind the portion extending from the frame engagement portion to the underside of the operation engagement portion.

When the grip is pulled, the portion that extends from the underside of the operation engagement portion to the grip moves up and down. With this configuration, the portion that moves up and down is behind the portion that extends from the frame engagement portion to the underside of the operation engagement portion, which prevents the strap from rubbing against the pad in front of the strap. This helps prevent damage to the pad.

The vehicle seat may include a movement restricting portion that is fixed to the seat back frame and extends in a direction intersecting the up-down direction.
The strap may be made of a belt and may have a joint where the belt is folded and overlapped and the overlapped portions are joined together. It is preferable that the movement restricting portion is disposed between the plurality of belts above the joint and, when the gripping portion is pulled, is capable of engaging with the joint to restrict the amount of pulling of the gripping portion.

With this configuration, the joint engages with the movement restriction portion, limiting the amount of pulling on the grip portion, thereby preventing the locking device from breaking down.

In this case, the joint may be made by sewing multiple belts together.

With this configuration, the joints can be made stronger by sewing.

The movement restriction portion may be located behind the strap engagement portion. It is preferable that the strap is bent so as to protrude backward at the portion where it contacts the movement restriction portion.

This configuration makes it less likely that the strap will come into contact with the pad on the front side of the strap.

The vehicle seat may further include a first wire bracket fixed to the seat back frame and formed by bending a wire.
The first wire bracket can have a first U-shaped portion that opens upward and has a lower end which is the strap engagement portion, and the movement regulating portion extending from one upper end of the first U-shaped portion in a direction intersecting the vertical direction.

The vehicle seat may further include a second wire bracket fixed to the seat back frame, the second wire bracket being made by bending a wire, and having a U-shape that opens downward.
The first wire bracket has a second U-shaped portion that opens downward, the second U-shaped portion having an upper edge portion and a pair of downward extension portions extending downward from both left and right ends of the upper edge portion, each of the pair of lower ends of the second wire bracket being fixed to each of the pair of downward extension 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.

The vehicle seat may further include a third wire bracket made of a ring-shaped wire fixed to both the second U-shaped portion and the second wire bracket. The strap may pass through the ring shape of the third wire bracket.

As a result, the third wire bracket can increase the rigidity of the portion of the seat back frame through which the strap is pulled out.

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

One of the pair of downward extensions may be connected to the upper end of the other of the first U-shaped portions. It is also preferable that the first wire bracket has a spiral shape when viewed from the front.

This configuration allows the first wire bracket to be manufactured from a single wire, which makes it easier to manufacture the seat back frame.

The strap may be made of a belt. One end of the strap may be formed into a loop shape by folding and joining the belt, with the loop-shaped portion of the one end constituting the frame engagement portion, and the other end of the strap may be formed into a loop shape by folding and joining the belt, with the loop-shaped portion of the other end constituting the grip portion.

It is also desirable that one end of the strap be engaged with an operating engagement portion at the overlapping portion where the belt is folded.

In this way, the overlapping parts of the belt engage with the operating engagement part, which increases the durability of the strap.

The above-mentioned strap may be such that the length of the folded overlapping portion of the belt at one end is longer than the length of the folded overlapping portion of the belt at the other end.

The locking device may have a housing. The operating member may have a base extending from the housing located at a position different from the operating engagement part with which the strap engages in the left-right direction, and the range in which the drawer opening is located may overlap the range in which the operating engagement part is located in the left-right direction.

With this configuration, even if the base of the operating member is misaligned to the left or right from the strap pull-out opening, the pull-out opening and the operating engagement part are in a range that overlaps in the left-right direction, making it easy to pull the strap straight up. In other words, the operability of the locking device can be improved.

The load on the strap required to unlock the locking device can be reduced.

In addition, by having the part of the strap that moves up and down behind the part that extends from the frame engagement part to the bottom of the operation engagement part, it is possible to prevent the strap from rubbing against the pad in front of the strap.

In addition, by engaging the joint with the movement restriction portion, the amount of pulling of the grip portion can be limited, preventing the locking device from breaking down.

In addition, by stitching the joints, the joints can be made stronger.

In addition, because the strap is bent so that it protrudes backwards at the point where it comes into contact with the movement restriction part, the strap is less likely to come into contact with the pad on the front side of the strap.

In addition, by fixing the third wire bracket to both the second U-shaped portion and the second wire bracket, the rigidity of the portion of the seat back frame through which the strap is pulled out can be increased.

In addition, one of the pair of downward extensions is connected to the upper end of the other of the first U-shaped portions, and the first wire bracket has a spiral shape when viewed from the front, which makes it possible to manufacture the first wire bracket from a single wire. In other words, this makes it easier to manufacture the seat back frame.

In addition, the overlapping portion of the belt engages with the operating engagement portion, which increases the durability of the strap.

In addition, even if the base of the operating member is misaligned to the left or right from the strap pull-out opening, the pull-out opening and the operating engagement part are in a range where they overlap in the left-right direction, making it easy to pull the strap straight up. In other words, the operability of the locking device can be improved.

1 is a perspective view of a vehicle seat according to an embodiment; FIG. 4 is a front view of the seat back frame. FIG. 2 is a perspective view of the vicinity of a wire bracket of a seat back frame. 4 is a cross-sectional view of the vehicle seat when viewed from the left and right when the locking device is in a locked state. FIG. 1 is a cross-sectional view of a vehicle seat in a front-rear direction when a strap is pulled and the locking device is in an unlocked state; FIG. 2 is a cross-sectional view of the vehicle seat taken along the longitudinal direction at the position of the shape-retaining wire.

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

The seat back S1 has a seat back frame 30 as shown in Figs. 2 and 3. As shown in Fig. 4, the seat back frame 30 is covered with a pad P, which is further covered with a cover 81. The seat cushion S2, head rest S3, and arm rest S4 are similarly configured with a frame, pad, and cover (not shown). The pad P has a front pad P1 located in front of the seat back frame 30, and a rear pad P2 located behind the seat back frame 30. The front pad P1 is located in front of the strap 10.

As shown in FIG. 1, the vehicle seat S also includes a locking device 20 for locking the seat back frame 30 to the vehicle body 90, and a strap 10 for operating to unlock the locking device 20.

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 the latch 25 engages with the striker 95 to lock the seat back S1 against movement relative to the vehicle body 90.

The locking device 20 is fixed to a seat back frame 30 (see FIG. 2). The locking device 20 has an operating member 21 that is pulled upward to release the lock. Meanwhile, the seat back frame 30 is provided with a strap engaging portion 41A with which one end of the strap 10 is engaged.
The operating member 21 has an operating engagement portion 21B located below the strap engagement portion 41A.
The strap 10 has a frame engagement portion 12 that engages with the strap engagement portion 41A, and a grip portion 11 that is exposed to the outside of the seat back S1 through a pull-out opening S11 at the top of the seat back S1. The strap 10 extends upward from the frame engagement portion 12, passing under the operation engagement portion 21B, toward the grip portion 11, and engages with the operation engagement portion 21B so as to be able to pull up the operation engagement portion 21B.

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 (only one is shown in FIG. 2 ) extending in the vertical direction, and an upper frame 31B connecting the upper ends of the pair of side frames 31 A. A pair of headrest brackets 33 are fixed to the upper frame 31B in accordance with each seat.
In this specification, up/down, left/right, and front/rear are based on the vehicle seat S in a state in which the seat back S1 is locked to the vehicle body 90. The inside and outside in the left/right direction are based on the vehicle seat S, not the vehicle body 90.

The pan frame 32 is a frame made of a metal plate, is disposed behind the pipe frame 31, and is fixed to the pipe frame 31 by welding or the like. The pan frame 32 has multiple punched holes 32H to reduce weight.

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.

The first wire bracket 40 is made 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 restriction portion 43 that is fixed to the seat back frame 30.

The first U-shaped portion 41 has a strap engagement portion 41A, which is the lower end portion extending in the left-right direction, a first upward extension portion 41B extending upward from the left-right inner end of the strap engagement portion 41A, a second upward extension portion 41C extending upward from the left-right outer end of the strap engagement portion 41A, and an inclined portion 41D extending diagonally upward and inward from the upper end of the first upward extension portion 41B.

In this embodiment, the strap engagement portion 41A extends horizontally to the left and right, but may be slightly oblique. Also, in this embodiment, the strap engagement portion 41A is linear, but may be semicircular and open upward. The strap engagement portion 41A is disposed at a position separated from the pipe frame 31 and the pan frame 32 with a space therebetween.
A movement restricting portion 43 extends in a direction intersecting the up-down direction from an upper end of the second upward extending portion 41C, which is one of the upper ends of the first U-shaped portion 41. The movement restricting portion 43 is disposed at a position separated from the pipe frame 31 and the pan frame 32 while maintaining a space therebetween. In this embodiment, the movement restricting portion 43 extends horizontally to the left and right, but may extend obliquely 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.

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

The first downward extension 42B, which is one of the pair of downward extensions, is connected to the inclined portion 41D, which is the other upper end of the first U-shaped portion 41. As a result, the first wire bracket 40, combining the first U-shaped portion 41 and the second U-shaped portion 42, has a spiral shape that extends clockwise from the inside to the outside when viewed from the front.

The first wire bracket 40 has an inclined portion 41D, a second downward extension portion 42C, and a fixed portion 42D fixed to the seat back frame 30. Specifically, the inclined portion 41D is welded to a portion of the pipe frame 31 that extends in an arc shape connecting the side frame 31A and the upper frame 31B. The second downward extension portion 42C and the fixed portion 42D are welded to the pan frame 32. Note that in the drawings, reference numerals are omitted, but each welded portion is indicated by hatching.

The second wire bracket 52 is made by bending a wire and is fixed to the seat back frame 30. The second wire bracket 52 is fixed directly to the first wire bracket 40, and is fixed to the seat back frame 30 via the first wire bracket 40.

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

The third wire bracket 53 is made of a ring-shaped wire. More specifically, the third wire bracket 53 is made of an oval-shaped 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 of the third wire bracket 53 is fixed to the upper edge 42A of the first wire bracket 40 by welding. The rear edge of the third wire bracket 53 is fixed to the upper edge 52A of the second wire bracket 52 by welding (not shown). The strap 10 passes through the ring shape of the third wire bracket 53.

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. The strap 10 passes through the through hole 55A of the plastic cover 55. The through hole 55A serves as the pull-out opening S11 for the strap 10.

The fourth wire bracket 54 is a member for maintaining 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 each fixed to the second downward extension portion 42C of the first wire bracket 40 by welding.

Although not shown in the figure, 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 both the left and right sides of the seat back frame 30.

As shown in FIG. 6, the fourth wire bracket 54 protrudes forward, with the front portion 54A positioned forward of the first wire bracket 40. It contacts the front pad P1 of the pad P and maintains the shape of the front pad P1, specifically, the shape of the upper left and right ends.

As shown in FIG. 2, the locking device 20 has a housing 20A, and multiple components such as the latch 25 are housed inside the housing 20A. The entirety of the withdrawal opening S11 is located in a different position from the housing 20A of the locking device 20 in the left-right direction, specifically, shifted inwardly to the left and right from the housing 20A.

The operating member 21 has a base 21A extending upward from the housing 20A, an operating engagement portion 21B with which the strap 10 engages, a connecting portion 21C diagonally connecting the operating engagement portion 21B and the base 21A, and a stopper 21D that is bent to make a U-turn downward from the inner left and right ends of the operating engagement portion 21B. The stopper 21D has a function of preventing the strap 10 engaged with the operating engagement portion 21B from coming off the operating engagement portion 21B. The base 21A is located at a different position from the operating engagement portion 21B in the left and right direction, specifically at a position shifted outward to the left and right. Meanwhile, in the left and right direction, the range L5 in which the pull-out opening S11 (through hole 55A) is located overlaps with the range in which the operating engagement portion 21B is located.

In addition, in the left-right direction, the range L5 in which the pull-out opening S11 is located overlaps with the range in which the strap engagement portion 41A is located, and the range L5 in which the pull-out opening S11 is located overlaps with the range in which the movement restriction portion 43 is located.

As a result, the strap 10 can extend straight up and down from the pull-out opening S11 to the operation engagement part 21B and the strap engagement part 41A without bending left or right.

3 and 4, the strap 10 is made of a belt. The strap 10 is made of a belt made of, for example, plastic fiber. The strap 10 is made by folding the upper and lower ends of a single belt backward and sewing them together.
The strap 10 has a front belt B1 located at the front and extending from its upper end to the strap engagement portion 41A, an upper belt B2 extending downward from the upper end of the front belt B1, overlapping the rear side of the front belt B1, and a lower belt B3 extending downward from the end that engages with the strap engagement portion 41A of the front belt B1, overlapping the front side of the front belt B1, and extending upward from the portion that engages with the operation engagement portion 21B of the front belt B1, overlapping the rear side of the front belt B1.

The length of the upper belt B2 (where the belt at one end is folded over and overlapped) of the strap 10 is longer than the length of the lower belt B3 (where the belt at the other end is folded over and overlapped).

One end of the strap 10, the lower end, is formed into a loop shape by folding and joining the belt. 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, i.e., the overlapping portion where the belt is folded, constitutes the locking device engagement portion 13 that engages with the operation engagement portion 21B.

The other end of the strap 10, that is, the upper end, is formed into a loop shape by folding and joining the belt. Specifically, the front belt B1 and the upper belt B2 are joined to each other by the stitching portion 120 and the 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 thickness of the rivet 18 in the front-rear direction is greater than the dimension of the pull-out opening S11 in the front-rear direction, and prevents the gripping portion 11 from entering the seat back S1 through the pull-out opening S11. The rivet 18 also has the function of reinforcing the stitching portion 130.

At the stitching section 120, the front belt B1 and the upper belt B2 are sewn together over a predetermined length in the longitudinal direction of the strap 10.

The stitching portion 130 is disposed at a predetermined distance above the stitching portion 120. The stitching portion 130 is longer in the vertical direction than the stitching portion 120. In the stitching portion 130, the front belt B1 and the upper belt B2 are sewn together 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, a second stitching portion 132 extending to connect the lower ends of the first stitching portion 131 in the width direction of the belt, and a third stitching portion 133 extending to connect the upper ends of the first stitching portion 131 in the width direction of the belt. As a result, the stitching portion 130 integrates the front belt B1 and the upper belt B2, and provides the strap 10 with appropriate rigidity. Since the sewn portion 130 is separated from the sewn portion 120, the portion between the sewn portion 120 and the sewn portion 130 is not sewn to the front belt B1 and the upper belt B2, and forms a flat ring shape.

The sewn portion 120 and the sewn portion 130 are an example of a joint. The movement restricting portion 43 is disposed between the multiple belts (front belt B1 and upper belt B2) above the sewn portion 120. In other words, the movement restricting portion 43 is disposed between the front belt B1 and the upper belt B2 in the portion between the sewn portion 120 and the sewn portion 130. This allows the movement restricting portion 43 to engage with the sewn portion 120 and restrict the amount of pulling of the gripping portion 11 when the gripping portion 11 is pulled.

The portion of the strap 10 that extends from the underside of the operation engagement portion 21B to the grip portion 11 is located behind the portion that extends from the frame engagement portion 12 to the underside of the operation engagement portion 21B. The strap engagement portion 41A is a short distance behind the front pad P1. Also, the portion of the strap 10 that extends from the frame engagement portion 12 to the underside of the operation engagement portion 21B is a short distance behind the front pad P1. Also, the portion of the strap 10 that extends from the underside of the operation engagement portion 21B to the grip portion 11 is located behind the portion that extends from the frame engagement portion 12 to the underside of the operation engagement portion 21B, so it is a relatively large distance behind the front pad P1.

The movement restriction portion 43 is located behind the strap engagement portion 41A. The strap 10 is bent so as to protrude backward at the portion where it comes into contact with the movement restriction portion 43.

When assembling the strap 10 to the vehicle seat S configured in this manner, the loop at the lower end of the strap 10 before the rivet 18 is attached is hung on the strap engagement portion 41A of the first wire bracket 40, and the entire strap 10 is passed from front to back under the operation engagement portion 21B (between the operation engagement portion 21B and the stopper 21D). Then, the grip portion 11 is pulled up, and the movement restriction portion 43 is inserted between the two belts between the stitching portion 120 and the stitching portion 130. Furthermore, the grip portion 11 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 grip portion 11 of the strap 10 is exposed above the plastic cover 55, the rivet 18 is fastened to the strap 10. This prevents the strap 10 from coming off.

During this assembly, the strap 10 has a stitched portion 130 that is sewn along the longitudinal direction, so the upper portion of the strap 10 has rigidity and can be easily passed through the third wire bracket 53 and the through hole 55A of the plastic cover 55.

When the grip portion 11 of the strap 10 is pulled upward when the locking device 20 is in the locked state as shown in FIG. 4, the operating member 21 is pulled up, the latch 25 rotates, and the locking device 20 enters the unlocked state as shown in FIG. 5. At this time, the striker 95 is released from the latch 25 and the seat back S1 rotates slightly forward. The stitching portion 120 engages with the movement restriction portion 43, so that the strap 10 does not move upward any further.

When the grip portion 11 is pulled, 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 grip portion 11, both pull the operation engagement portion 21B upward. As a result, the operation engagement portion 21B can be pulled up with a force approximately twice the tension of the strap 10 generated by pulling the grip portion 11, and the load on the strap 10 required to unlock the locking device 20 can be reduced.

When the grip portion 11 is pulled, the portion of the strap 10 that extends from the frame engagement portion 12 to the lower side of the operation engagement portion 21B does not move up and down, but the portion that extends from the lower side of the operation engagement portion 21B to the grip portion 11 moves up and down. This portion that moves up and down is behind the portion of the strap 10 that extends from the frame engagement portion 12 to the lower side of the operation engagement portion 21B, so it is less likely to rub against the front pad P1 in front of the strap 10. This makes it possible to prevent damage to the pad P. In particular, in this embodiment, the strap 10 is bent so that the portion that engages with the movement restriction portion 43 protrudes backward, so it is less likely to rub against the front pad P1, and damage to the pad P can be prevented.

In addition, as shown in FIG. 5, the stitching portion 120 engages with the movement restriction portion 43, which limits the amount of pulling of the gripping portion 11, thereby preventing the locking device 20 from failing due to excessive pulling of the operating member 21.

Furthermore, the vehicle seat S of this embodiment can achieve the following effects.
The strap 10 is made of belts joined by sewing, so that the joints can be made strong.

In addition, 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 through which the strap 10 is pulled out can be increased.

In addition, the first wire bracket 40 can be manufactured from a single wire, making it easy to manufacture the seat back frame 30.

In addition, the overlapping portion of the belt of the strap 10 engages with the operation engagement portion 21B, which increases the durability of the strap 10.

In addition, although the base 21A of the operating member 21 is offset to the left and right from the pull-out opening S11 of the strap 10, the pull-out opening S11 and the operating engagement portion 21B are in a range where they overlap in the left-right direction, so it is easy to pull the strap 10 straight up. In other words, the vehicle seat S of this embodiment can improve the operability of the locking device 20.

Although the embodiment of the present invention has been described above, the present invention is not limited to the above-mentioned embodiment. The specific configuration can be appropriately changed without departing from the spirit of the present invention.

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 it may be made of a string rather than a belt.

The configuration of the strap 10 is not limited to that of the embodiment, and may be manufactured by joining two or more belts together, for example. The strap 10 is not limited to a configuration in which two belts are layered and joined together, and may be a configuration in which three or more belts are layered and joined together.

In the above embodiment, the strap engagement portion 41A, the upper edge portion 42A of the second U-shaped portion 42, and the movement restriction portion 43 are configured as a single part as the first wire bracket 40, but each part may be configured as a separate member.

In the above embodiment, the strap 10 is joined to the belt by sewing, but it may also be joined by welding or riveting.

In addition, the elements of the above-mentioned embodiments and variations can be implemented in combination as appropriate.

REFERENCE SIGNS LIST 10 strap 11 gripping portion 12 frame engagement portion 20 locking device 20A housing 21 operating member 21A base portion 21B operation engagement portion 30 seat back frame 40 first wire bracket 41 first U-shaped portion 41A strap engagement portion 42 second U-shaped portion 43 movement restriction 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 pull-out opening SK cover

Claims (12)

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 . The third joint portion 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. The vehicle seat according to claim 1, wherein the second joint portion joins the second portions to each other over a predetermined length in the longitudinal direction. 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. 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. The vehicle seat according to claim 1, wherein a rivet is attached to an end of the third joint portion farther from the second joint portion in the longitudinal direction. 7. The vehicle seat according to claim 1, wherein a portion of the second portion between the second joint portion and the third joint portion is not joined to each other. The seat back frame is provided with a strap engagement portion with which one end of the strap is engaged 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. a loop-shaped portion of the strap formed at an end portion farther from the second joint portion than the third joint portion in the longitudinal direction serves as a grip portion exposed to the outside of the seat back through a pull-out opening at an upper portion 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. 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. 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. The vehicle seat according to claim 11, wherein the strap is disposed inward of the wire bracket in the left-right direction of the seat back.

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