JP2023103127A - Vehicular seat - Google Patents

Abstract

To obtain a vehicular seat capable of automatically returning a headrest from a storage position to a use position, and reducing a load continuously acting on a cable.SOLUTION: A clutch plate 48 is provided, which moves in a direction (an arrow A direction) against energizing force by a second torsion spring by an engagement piece 35 of a receiving member 34 moving downward by seating of an occupant, and applies tensile force to a cable 40. When the tensile force is applied to the cable 40 by rotations of the clutch plate 48, a locking state is released, thereby moving a headrest 16 from a storage position to a user position. On the other hand, when the engagement piece 35 moving downward passes through the clutch plate 48, pressing force to the clutch plate 48 of the engagement piece 35 is released, and the clutch plate 48 is energized in an arrow B direction by the second torsion spring. The cable 40 is released from a state applied tensile force. Namely, a load continuously acting to the cable can be reduced.SELECTED DRAWING: Figure 4

Description

The present invention relates to a vehicle seat.

Patent Document 1 discloses a vehicle seat that includes a seat back that supports the upper body of an occupant, a headrest that is attached to the seat back so as to move up and down between a use position that supports the head and a retracted position that is positioned below the use position, and a movable portion that notifies the occupant that the headrest is in the retracted position.

Here, the headrest design requirements stipulate that the height of the headrest may be less than the legal size when there is no occupant, but that the headrest must automatically return to the use position when a passenger is seated, or it must be clearly recognizable that the position does not correspond to the use position. For this reason, in this prior art, when the headrest is in the stowed position, the movable portion is arranged so as to protrude forward, thereby preventing the passenger from sitting on the vehicle seat.

Specifically, the movable portion is provided with a spring member that biases the movable portion toward the rear side of the seat, and an engaging wall portion that can accommodate the movable portion is provided on the seat back side. When the headrest with the protruded movable portion is pushed up from the retracted position to the use position, the movable portion returns to its original position by the biasing force of the spring member.

Japanese Unexamined Patent Application Publication No. 2019-1272

In the case of the configuration of the above-mentioned prior art, the occupant cannot sit down in the retracted position of the headrest, so that the passenger can recognize that the headrest does not correspond to the use position.

For this reason, it has been considered to automatically return the headrest to the use position. On the other hand, for example, it is possible to suppress an increase in cost by using a cable or the like that transmits an external force (to which tension is applied) in conjunction with the seating motion of the occupant. However, since the tension is applied to the cable in conjunction with the seating motion of the passenger, the cable continues to be tensioned while the passenger is seated.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a vehicle seat capable of automatically returning the headrest from the retracted position to the use position and reducing the load on the continuously acting cable.

A vehicle seat according to a first aspect of the present invention includes a seat cushion on which an occupant sits, a seat back that supports the upper body of the occupant seated on the seat cushion, and a headrest that is disposed above the seat back and is vertically movable between a use position that supports the head of the occupant seated on the seat cushion and a retracted position that is positioned below the use position. a first biasing member, which is provided on the seat cushion and is pressed and moved when an occupant is seated on the seat cushion, a cable connected to the first locking portion for releasing a locked state in which movement of the headrest is restricted by the first locking portion when tension is applied; a clutch part that is pressed and moved by the moving receiving member to apply tension to the cable, and releases the state in which the tension is applied to the cable when the receiving member passes.

In the vehicle seat according to the first aspect of the invention, the headrest disposed above the seat back supporting the upper body of the occupant seated on the seat cushion is movable up and down between a use position supporting the head of the occupant seated on the seat cushion and a retracted position positioned below the use position, which is not the so-called use position.

Further, the vehicle seat includes a first lock portion, a first biasing member, a receiving member, a cable, and a clutch portion, and the headrest is restricted from moving at the retracted position by the first lock portion. Here, the first biasing member accumulates elastic energy in a state in which movement of the headrest is restricted by the first locking portion, and biases the headrest in a direction to move the headrest from the storage position to the use position.

Therefore, when the locked state by the first lock portion is released, the headrest is moved from the storage position to the use position by the biasing force of the first biasing member. On the other hand, the receiving member is provided on the seat cushion, and is pressed when the occupant sits on the seat cushion.

A cable is connected to the first lock portion, and when tension is applied to the cable, the locked state in which movement of the headrest is restricted by the first lock portion is released. Here, the clutch portion is arranged on the moving locus of the receiving member. The clutch portion is pressed and moved by a receiving member that moves when the passenger sits on the seat. This provides tension to the cable. Then, when the receiving member passes through, the tension applied to the cable is released by the clutch portion.

That is, in the present invention, when an occupant sits on the seat cushion, the receiving member is pressed and tension is applied to the cable through the clutch portion. Then, the locked state of the headrest by the first locking portion is released via the cable. As a result, the headrest is automatically moved (returned) from the storage position to the use position by the biasing force of the first biasing member. After that, the tension applied to the cable by the clutch is released.

Thus, by using the clutch portion that secures or interrupts the tension transmission path through which tension is transmitted between the receiving member and the cable, it is possible to minimize the load acting on the cable with a simple configuration.

A vehicle seat according to a second aspect of the invention is the vehicle seat according to the first aspect of the invention, wherein the clutch portion is set to return to an initial position when the receiving member passes.

In the vehicle seat according to the second aspect of the invention, the clutch portion is set so as to return to the initial position when the receiving member passes, so that the clutch portion is pressed by the receiving member even when the occupant leaves the seat cushion. Accordingly, the positional relationship between the receiving member and the clutch portion, which has been replaced by the passenger sitting on the seat, can be restored by the passenger leaving the seat.

The vehicle seat according to the invention of claim 3 is the vehicle seat according to the invention of claim 2, wherein the clutch portion is provided rotatably about a shaft portion arranged along the width direction of the seat, and the cable is connected to a free end side of the rotating member. It includes a second biasing member that biases the clutch member in the direction of returning to the initial position, and a third biasing member that is provided on the clutch member and biases the clutch member in the direction of returning the clutch member to the initial position.

In the vehicle seat according to the third aspect of the invention, the clutch portion includes the rotating member, the clutch member, the second biasing member, and the third biasing member. The rotating member is provided so as to be rotatable around a shaft arranged along the seat width direction, and a cable is connected to the free end side of the rotating member. Further, the clutch member is rotatable about the shaft portion, and is rotatable together with the rotatable member to apply tension to the cable or rotatable with respect to the rotatable member.

Here, the rotating member is provided with a second biasing member, and the second biasing member biases the rotating member and the clutch member in a direction to return them to their initial positions. As a result, when the receiving member pressed by the seated occupant passes through the clutch member, the rotating member and the clutch portion rotate about the shaft portion against the biasing force of the second biasing member to apply tension to the cable.

Then, when the receiving member passes the clutch member, the rotating member and the clutch portion can return to their initial positions due to the biasing force of the second biasing member. This releases the cable from the tensioned state.

Further, the clutch member is provided with a third biasing member, and the third biasing member biases the clutch member in the direction of returning to the initial position. As a result, when the receiving member whose pressing force is released by the passenger leaving the seat passes through the clutch member, the clutch portion rotates with respect to the rotating member against the biasing force of the third biasing member, and when the receiving member passes the clutch member, the clutch portion can return to the initial position due to the biasing force of the third biasing member.

The vehicle seat according to the invention of claim 4 is the vehicle seat according to the invention of claim 3, wherein the clutch portion further includes a first stopper that restricts movement of the rotating member when the rotating member is biased by the second biasing member, and a second stopper that restricts movement of the clutch member when the clutch member is biased by the third biasing member.

In the vehicle seat according to the invention of claim 4, the clutch portion further includes a first stopper and a second stopper, and when the rotating member is biased by the second biasing member, the first stopper restricts movement of the rotating member. Further, when the clutch member is biased by the third biasing member, the movement of the clutch member is restricted by the second stopper.

The vehicle seat according to the invention of claim 5 is the vehicle seat according to any one of claims 1 to 4, wherein the headrest includes a pair of tubular leg portions that are part of the frame member of the headrest body and are exposed to the outside and attached to the upper end portion of the seat back.

In the vehicle seat according to the fifth aspect of the present invention, the headrest includes a pair of tubular leg portions that are part of the frame member of the headrest body and that are exposed to the outside and attached to the upper end portion of the seat back, and the first biasing members are respectively arranged in the pair of leg portions. One of the first biasing members is in contact with the upper end side of the seatback, and the first biasing member can bias the headrest in the direction of moving from the retracted position to the use position.

The vehicle seat according to the invention of claim 6 is the vehicle seat according to the invention of claim 5, wherein the first lock portion includes a recess formed in the leg portion along a direction substantially orthogonal to the up-down direction of the seat, and a first engagement portion that engages with the recess when the headrest is in the retracted position to restrict movement of the headrest.

In the vehicle seat according to the sixth aspect of the invention, the first lock portion includes a recess formed in the leg portion and a first engaging portion engaged with the recess. The recess is formed in the leg along a direction substantially orthogonal to the vertical direction of the seat, and when the headrest is in the retracted position, the first engaging portion is engaged with the recess, thereby restricting (up-and-down) movement of the headrest. That is, the headrest is maintained in the retracted position.

The vehicle seat according to the invention of claim 7 is the vehicle seat according to the invention of claim 6, wherein the first lock portion further includes a fourth biasing member that biases the first engagement portion in a direction in which the first engagement portion maintains the state of engagement with the recess.

In the vehicle seat according to the seventh aspect of the invention, the first locking portion further includes a fourth biasing member, and the fourth biasing member keeps the first engaging portion engaged with the recess.

The vehicle seat according to the invention of claim 8 is the vehicle seat according to any one of claims 1 to 7, wherein a second locking portion that restricts movement of the headrest at the use position of the headrest is provided.

In the vehicle seat according to the eighth aspect of the invention, the second lock portion is provided to restrict movement of the headrest at the use position of the headrest, and the movement of the headrest is restricted by the second lock portion. That is, the headrest is locked at the retracted position by the first lock portion, and the headrest is locked at the use position by the second lock portion.

A vehicle seat according to a ninth aspect of the invention is the vehicle seat according to the eighth aspect of the invention, wherein the second locking portion includes a recess formed in a leg portion of the headrest along a direction substantially perpendicular to the up-down direction of the seat, and a second engaging portion that engages with the recess when the headrest is in the use position and restricts movement of the headrest.

In the vehicle seat according to the ninth aspect of the invention, the second locking portion includes a recess formed in the leg portion of the headrest and a second engaging portion engaged with the recess. The recess is formed in the leg along a direction substantially perpendicular to the vertical direction of the seat, and when the headrest is in the use position, the second engaging portion is engaged with the recess, thereby restricting (up-and-down) movement of the headrest. That is, the headrest is maintained in the position of use.

As described above, according to the vehicle seat of the present invention, the headrest can be automatically returned from the retracted position to the use position, and the load on the cable that continuously acts can be reduced.

1 is a perspective view of a vehicle seat according to an embodiment of the present invention as viewed diagonally from the front left side; FIG. In the vehicle seat according to the present embodiment, (A) is a side view showing the use position of the headrest, and (B) is a side view showing the retracted position of the headrest. FIG. 3 is a perspective view showing a receiving member and a clutch portion provided on the seat cushion side of the vehicle seat according to the embodiment; FIG. 4 is a side view showing a receiving member and a clutch portion provided on the seat cushion side of the vehicle seat according to the present embodiment; FIG. 4 is a side view for explaining the operation of a receiving member and a clutch portion provided on the seat cushion side of the vehicle seat according to the present embodiment; FIG. 4 is a side view for explaining the operation of a receiving member and a clutch portion provided on the seat cushion side of the vehicle seat according to the present embodiment; FIG. 4 is a side view for explaining the operation of a receiving member and a clutch portion provided on the seat cushion side of the vehicle seat according to the present embodiment; FIG. 4 is a side view for explaining the operation of a receiving member and a clutch portion provided on the seat cushion side of the vehicle seat according to the present embodiment; FIG. 4 is a side view for explaining the operation of a receiving member and a clutch portion provided on the seat cushion side of the vehicle seat according to the present embodiment; FIG. 4 is a side view for explaining the operation of a receiving member and a clutch portion provided on the seat cushion side of the vehicle seat according to the present embodiment; FIG. 4 is a cross-sectional view showing the state of the coil springs in the vehicle seat according to the embodiment when the headrest is arranged at the retracted position; FIG. 4 is a cross-sectional view showing the state of the coil springs in the vehicle seat according to the present embodiment when the headrest is arranged at the use position; FIG. 4 is a perspective view showing the action of a cable and a first locking portion provided on the seat back side of the vehicle seat according to the present embodiment; FIG. 4 is a plan view showing the action of a cable and a first locking portion provided on the seat back side of the vehicle seat according to the present embodiment;

A vehicle seat according to an embodiment of the present invention will be described below with reference to the drawings. An arrow FR, an arrow UP, and an arrow RH, which are appropriately shown in each drawing, respectively indicate the front (advance direction), the upper direction, and the right direction of the vehicle. Hereinafter, when simply using the front-rear, left-right, and up-down directions, the front-rear direction of the vehicle, the left-right direction of the vehicle lateral direction (vehicle width direction), and the up-down direction of the vehicle will be used unless otherwise specified.

(Structure of vehicle seat)
First, the configuration of the vehicle seat according to the embodiment of the present invention will be described.

As shown in FIG. 1, the vehicle seat 10 is, for example, a seat used as a rear seat, and includes a seat cushion 12 on which an occupant sits, a seat back 14 erected from the rear end of the seat cushion 12 and supporting the upper body of the occupant seated on the seat cushion 12, and a headrest 16 attached to an upper end portion 14A of the seat back 14 and supporting the head of the occupant seated on the seat cushion 12.

In this embodiment, the headrest 16 is movable between a use position P that supports the head of an occupant seated on the seat cushion 12 as shown in FIG.

Here, assuming that the legal dimension of the headrest 16 set at the use position P of the headrest 16 is H1, the height (H2) of the headrest 16 can be made lower than H1 at the storage position Q of the headrest 16, and a wide field of view can be secured on the rear side of the vehicle.

As shown in FIG. 1, the headrest 16 includes a headrest stay 18 as a skeleton member, and an elastically deformable headrest pad 20 made of a foaming agent such as urethane foam. The headrest stay 18 is, for example, a metal pipe material that is bent into a generally inverted J shape when viewed from the left side, and is formed integrally with the headrest pad 20 . The headrest stay 18 also has a pair of legs 22 and 24 exposed from the headrest pad 20 and arranged side by side along the seat width direction.

On the other hand, the seat cushion 12 includes a seat cushion frame 26 which is a skeleton member and has a substantially rectangular shape in a plan view. A spring mat 32 is provided between a pair of side frames 30 that constitute the right and left sides of the seat cushion frame 26 and extend along the seat front-rear direction.

A plate-shaped receiving member 34 is fixed to the central portion of the spring mat 32 in the seat width direction. As shown in FIG. 4, from the lower surface of the rear end portion 34A of the receiving member 34, an engaging piece 35 having a substantially rectangular shape with its longitudinal direction extending in the vertical direction in a side view hangs down.

Therefore, when an occupant sits on the seat cushion 12 and the spring mat 32 bends, the engaging piece 35 of the receiving member 34 moves downward together with the spring mat 32 . The lower portion 35A of the engaging piece 35 is wider than the upper portion 35B side, and the rear end 35A1 of the lower portion 35A side slopes rearward as it goes downward to form a top portion 35C.

As shown in FIG. 1 , a pipe 36 is provided on the rear side of the spring mat 32 so as to extend between the pair of side frames 30 along the seat width direction. One side 37A of a mounting bracket 37 extending toward the receiving member 34 and having an inverted L shape when viewed from the front is fixed to the central portion of the pipe 36 by welding or the like.

As shown in FIG. 3, a bracket 38 is fixed by welding or the like to the other side 37B of the mounting bracket 37 so as to overlap the mounting bracket 37. As shown in FIG. A vertical wall portion 38A that bends along the seat width direction is formed at the rear end portion of the bracket 38. A plug 42 provided on one end side of an outer cable 41 that covers the cable 40 is attached to the vertical wall portion 38A along the seat front-rear direction.

One end portion 40A side of the cable 40 is exposed from the axial center of the plug 42, and the one end portion 40A of the cable 40 is provided with a crank-shaped engaging member 44. As shown in FIG. An upper end portion of a plate-shaped rotary plate (rotating member) 45 forming part of the clutch portion 43 is engaged with the engaging portion 44A forming the central portion of the engaging member 44 . As shown in FIG. 5, the rotating plate 45 is arranged along the vertical direction at the initial position R. As shown in FIG. A shaft portion 46 is provided at the lower end portion of the rotating plate 45 , and the rotating plate 45 is rotatably supported around the shaft portion 46 .

That is, in this embodiment, the upper end side of the rotating plate 45 is the free end side. 45 A of insertion holes are formed in the upper end part of the rotation board 45, and 44 A of engaging parts are inserted in the said insertion hole 45A. Therefore, as indicated by the solid line in FIG. 7, when the rotating plate 45 rotates in the direction of the arrow A, the cable 40 is pulled forward through the engaging portion 44A and the insertion hole 45A.

On the other hand, as shown in FIG. 5 , a plate-shaped clutch plate (clutch member) 48 that constitutes another part of the clutch portion 43 is rotatably supported on the shaft portion 46 . The clutch plate 48 is arranged along the front-rear direction at the initial position S, the shaft portion 46 is provided at the rear end portion of the clutch plate 48, and the clutch plate 48 and the rotary plate 45 are arranged in a substantially inverted L shape when viewed from the left side of the seat.

A pin 48A is provided on the free end side of the clutch plate 48 . As described above, when an occupant sits on the seat cushion 12 and the spring mat 32 bends, the engaging piece 35 of the receiving member 34 moves downward. In order to operate the clutch plate 48 in conjunction with the movement of the engaging piece 35 of the receiving member 34, the pin 48A is arranged on the locus of movement of the top portion 35C of the engaging piece 35, as shown in FIG.

With the configuration described above, as shown in FIGS. 4 and 5 , when the spring mat 32 bends when an occupant sits on the seat cushion 12 , the receiving member 34 moves downward together with the spring mat 32 . As a result, as shown in FIG. 6, the engaging piece 35 moves downward, and the top portion 35C of the engaging piece 35 comes into contact with the pin 48A provided on the clutch plate 48. As shown in FIG.

Then, as shown in FIG. 7, the clutch plate 48 is pressed via the pin 48A, rotates (moves) about the shaft portion 46, and rotates the rotating plate 45 in the arrow A direction via the stopper 45B. As a result, the cable 40 is pulled forward. Thus, in this embodiment, the cable 40 is pulled when the occupant sits on the seat cushion 12 regardless of the occupant's load.

Here, the rotating plate 45 is provided with a second torsion spring (not shown) that biases the rotating plate 45 in the arrow B direction. The rotating plate 45 rotated in the direction of the arrow A can be returned to the initial position R by the biasing force of the second torsion spring.

As shown in FIG. 8, when the top portion 35C of the engaging piece 35 of the receiving member 34 moving downward passes the pin 48A of the clutch plate 48, the pressing force of the engaging piece 35 of the receiving member 34 on the clutch plate 48 is released. As a result, the clutch plate 48 is biased (restored) in the direction of arrow B by the second torsion spring, and the cable 40 is released from the tension applied by the clutch plate 48 .

A first stopper (not shown) is provided with which the rotating plate 45 can abut when the rotating plate 45 has returned to the initial position R. When the rotating plate 45 contacts the first stopper, the rotation of the rotating plate 45 in the arrow B direction is restricted.

On the other hand, the clutch plate 48 is provided with a third torsion spring (not shown) that biases the clutch plate 48 in the arrow C direction. A stopper (second stopper) 45B is provided at the lower end of the rotary plate 45 . A clutch plate 48 can come into contact with the stopper 45B, and when the clutch plate 48 comes into contact with the stopper 45B, rotation of the clutch plate 48 in the arrow C direction is restricted.

Here, as shown in FIG. 1, the seatback 14 includes a seatback frame 50 which is a skeleton member and has a substantially rectangular shape when viewed from the front. A plate-shaped seat back panel 52 is fixed to the rear side of the seat back frame 50 , and a seat back pad 54 is attached to the front side of the seat back frame 50 . The lower end of the seatback frame 50 is rotatably connected to the rear end of the seat cushion frame 26 via a well-known reclining mechanism 55 .

A pair of left and right support brackets 56 and 58 are provided side by side in the seat width direction at a center portion in the seat width direction of an upper frame 50</b>A forming the upper portion of the seat back frame 50 . The support brackets 56 and 58 are substantially cylindrical, and the leg portions 22 and 24 of the headrest 16 can be inserted into the support brackets 56 and 58, respectively.

As shown in FIG. 11, the leg portions 22 and 24 are formed with recesses 22A and 24A that are recessed in the axial direction of the leg portions 22 and 24, respectively. Here, the support bracket 58 is provided with a lock portion 59 . The locking portion 59 is provided with an engaging portion (second engaging portion) 59A that engages with the recess 24A.

The engaging portion 59A abuts on the outer peripheral surface of the leg portion 24 and is biased toward the outer peripheral surface side. Therefore, as shown in FIG. 12, when the recessed portion 24A of the leg portion 24 reaches a position facing the engaging portion 59A, the engaging portion 59A is engaged with the recessed portion 24A of the leg portion 24. As shown in FIG. Thereby, the headrest 16 is maintained at the use position P as shown in FIG. 2(A).

Further, in the present embodiment, as shown in FIG. 1, a support plate 60 having a substantially U-shape in plan view with an opening on the seat back panel 52 side is fixed to the seat back panel 52 by welding or the like below the support brackets 56 and 58. That is, the support plate 60 forms a gap with the seat back panel 52 and protrudes toward the front side of the seat.

On the front surface of the support plate 60, columnar holding members 62 and 64 are fixed to the lower side of the support brackets 56 and 58 by welding or the like so as to extend along the vertical direction of the seat. As shown in FIG. 11, insertion portions 66 and 68 having a smaller diameter than other portions of the holding members 62 and 64 are formed on the upper side of the holding members 62 and 64, respectively. Coil springs (first biasing members) 70 and 72 are provided outside the insertion portions 66 and 68, respectively, and the coil springs 70 and 72 can expand and contract along the axial direction of the insertion portions 66 and 68.

The holding members 62 and 64 including the insertion portions 66 and 68 on which the coil springs 70 and 72 are provided can be accommodated in the leg portions 22 and 24 of the headrest 16 inserted into the support brackets 56 and 58, and the headrest 16 (see FIG. 1) can be raised and lowered along the axial direction of the holding members 62 and 64.

On the other hand, the legs 22 and 24 are provided with recesses 22A and 24A, respectively. Since the recesses 22A and 24A are recessed in the axial direction of the legs 22 and 24, the inner surfaces of the legs 22 and 24 protrude accordingly. Coil springs 70, 72 are accommodated in the legs 22, 24, and one ends of the coil springs 70, 72 abut against the recesses 22A, 24A. The other ends of the coil springs 70, 72 abut on the stepped portions 66A, 68A of the insertion portions 66, 68 and urge the leg portions 22, 24 in the arrow D direction via the recesses 22A, 24A. In this embodiment, an example in which the coil springs 70 and 72 are housed in the legs 22 and 24 has been described, but the present invention is not limited to this, and the coil spring may be housed in only one of the legs.

As shown in FIGS. 13 and 14, on the seat back panel 52 side, a bracket 74 is provided between the legs 22 and 24 and on the leg 24 side. The bracket 74 has a substantially U shape with an opening on the front side in plan view, and a plug 76 provided on the other end side of the outer cable 41 is attached to one end portion 74A side of the bracket 74 along the seat width direction. The other end portion 40B side of the cable 40 is exposed from the axial center of the plug 76, and the other end portion 40B of the cable 40 is provided with a crank-shaped engaging portion 78. As shown in FIG.

A shaft plate portion 80 is formed substantially horizontally on the side of the other end portion 74B of the bracket 74 , and a shaft portion 82 is fixed to the shaft plate portion 80 . An engaging piece (first engaging portion) 84 is rotatably supported on the shaft portion 82 , and the engaging piece 84 can be engaged with the recess 24 A formed in the leg portion 24 .

In other words, the engaging piece 84 can rotate in the horizontal direction around the shaft portion 82 . A torsion spring (fourth biasing member) 86 is wound around the shaft portion 82, one end portion 86A of the torsion spring 86 is attached to the shaft plate portion 80, and the other end portion 86B of the torsion spring 86 is attached to the engaging piece 84. This torsion spring 86 keeps the engagement piece 84 in a state (locked state) in which it is engaged with the recessed portion 24A of the leg portion 24 .

As described above, in the present embodiment, the lock portion 75 is configured including the recess 24A, the engaging piece 84 and the torsion spring 86. As shown in FIG. In the locked state by the engaging piece 84, the coil springs 70 and 72 are compressed and elastic energy is accumulated.

Here, the engagement piece 84 is engaged with the engagement portion 78 provided at the other end portion 40B of the cable 40 . Therefore, when the cable 40 is pulled, the engaging piece 84 rotates in the direction of arrow E (see FIG. 14) about the shaft portion 82 against the biasing force of the torsion spring 86 via the engaging portion 78 . Thereby, the locked state by the engaging piece 84 is released.

As described above, in the locked state by the engaging piece 84, elastic energy is accumulated in the coil springs 70 and 72 as shown in FIG. Therefore, when the locked state is released, the biasing force of the coil springs 70 and 72 automatically moves (returns) the headrest 16 upward via the legs 22 and 24 as shown in FIG. 2(A).

On the other hand, as described above, the lock portion 59 is provided on the support bracket 58 side, and as shown in FIG. That is, when the headrest 16 has moved upward, the movement of the leg portions 22 and 24 is restricted by the locking by the engaging portion 59A, and the state in which the headrest 16 has returned is maintained.

(Function and Effect of Vehicle Seat)
Next, functions and effects of the vehicle seat according to the embodiment of the present invention will be described.

As shown in FIGS. 2A and 2B, in this embodiment, in the vehicle seat 10, the headrest 16 is movable between a use position P supporting the head of an occupant seated on the seat cushion 12 and a retracted position Q positioned below the use position P.

In the present embodiment, as shown in FIGS. 1 and 11, the vehicle seat 10 includes a lock portion 75, coil springs 70 and 72, a receiving member 34, a cable 40, and a clutch portion 43. The movement of the headrest 16 is restricted at the retracted position Q by the lock portion 75. That is, the headrest 16 is maintained at the retracted position Q. As shown in FIG.

In addition, the coil springs 70 and 72 are compressed in a state where the movement of the headrest 16 is restricted by the lock portion 75, and elastic energy that biases the headrest 16 in the direction (arrow D direction) to move the headrest 16 from the storage position Q to the use position P is accumulated.

Therefore, when the locked state by the engaging piece 84 of the lock portion 75 is released, the headrest 16 is moved from the storage position Q to the use position P by the biasing force of the coil springs 70 and 72 . On the other hand, the receiving member 34 is provided on the seat cushion 12, and when the passenger sits on the seat cushion 12, the receiving member 34 is pressed and moves downward.

The cable 40 is connected to the lock portion 75 , and when tension is applied to the cable 40 , the locked state in which the movement of the headrest 16 is restricted by the lock portion 75 is released. Here, as shown in FIGS. 4 and 6 , the clutch portion 43 is arranged on the locus of movement of the top portion 35C of the engaging piece 35 provided on the receiving member 34 .

Here, in the present embodiment, the clutch portion 43 includes the rotating plate 45, the clutch plate 48, the second torsion spring, and the third torsion spring. The rotating plate 45 is provided so as to be rotatable around a shaft portion 46 arranged along the seat width direction, and the cable 40 is connected to the free end side of the rotating plate 45 .

The clutch plate 48 is rotatable about the shaft portion 46 , rotates together with the rotating plate 45 to apply tension to the cable 40 , and is rotatable with respect to the rotating plate 45 . A second torsion spring (not shown) is provided on the rotating plate 45, and the second torsion spring urges the rotating plate 45 and the clutch plate 48 in a direction to return them to the initial positions R, S.

As a result, when the apex 35C of the engaging piece 35 of the receiving member 34, which is pressed and moves downward when the occupant is seated, pushes (passes) the pin 48A provided on the clutch plate 48, the rotating plate 45 and the clutch plate 48 rotate about the shaft portion 46 against the biasing force of the second torsion spring to apply tension to the cable 40.

When the receiving member 34 passes through the clutch plate 48, the rotating plate 45 and the clutch plate 48 can return to the initial positions R, S due to the biasing force of the second torsion spring. As a result, the tensioned state of the cable 40 is released. Further, the clutch plate 48 is provided with a third torsion spring (not shown), and the third torsion spring urges the clutch plate 48 in the direction of returning to the initial position S.

As a result, as shown in FIG. 10, when the pin 48A of the clutch plate 48 is pushed by the top portion 35C of the engaging piece 35 of the receiving member 34 whose pressing force is released due to the occupant leaving the seat, the clutch plate 48 rotates with respect to the rotating plate 45 against the biasing force of the third torsion spring (in the direction of arrow C). When the top portion 35C of the engaging piece 35 passes through the pin 48A of the clutch plate 48, the clutch plate 48 can be returned to the initial position S by the biasing force of the third torsion spring.

Furthermore, in the present embodiment, the clutch portion 43 further includes a first stopper and a second stopper 45B (not shown), and when the rotating plate 45 is biased by the second torsion spring, the movement of the rotating plate 45 is restricted by the first stopper. Further, when the clutch plate 48 is biased by the third torsion spring, the movement of the clutch plate 48 is restricted by the second stopper 45B.

4 and 7, the clutch plate 48 is pressed by the engaging piece 35 of the receiving member 34 that moves when the occupant is seated, and rotates (moves) the rotating plate 45 in the direction (direction of arrow A) against the biasing force of the second torsion spring that biases in the direction of arrow B. As a result, tension is applied to the cable 40, and the locked state by the engaging piece 84 of the lock portion 75 provided on the other end portion 40B side of the cable 40 is released.

As a result, as shown in FIGS. 11 and 12, the biasing force of the coil springs 70 and 72 automatically moves (returns) the headrest 16 upward from the retracted position Q (see FIG. 2(B)) to the use position P (see FIG. 2(A)).

The engaging portion 59A provided in the lock portion 59 on the support bracket 58 side is engaged with the concave portion 24A formed in the leg portion 24 of the headrest 16, so that the headrest 16 that has moved upward is maintained at the use position P.

That is, in this embodiment, as described above, when the occupant sits on the seat cushion 12 , the receiving member 34 is pressed, and tension is applied to the cable 40 via the clutch plate 48 and the rotating plate 45 . As a result, the locked state of the lock portion 75 is released, and the biasing force of the coil springs 70 and 72 automatically moves (returns) the headrest 16 from the retracted position Q (see FIG. 2B) to the use position P (see FIG. 2A).

On the other hand, as shown in FIG. 8, when the top portion 35C of the engaging piece 35 of the receiving member 34 moving downward passes the pin 48A of the clutch plate 48, the pressing force of the engaging piece 35 of the receiving member 34 on the clutch plate 48 is released.

As a result, the clutch plate 48 and the rotating plate 45 are urged (restored) in the direction of the arrow B by the second torsion spring, and the tension applied to the cable 40 by the clutch plate 48 and the rotating plate 45 is released. Here, the rotation of the clutch plate 48 and the rotating plate 45 in the direction of the arrow B is restricted when the rotating plate 45 comes into contact with a first stopper (not shown).

Thus, in this embodiment, by using the clutch plate 48 that secures or interrupts the tension transmission path through which tension is transmitted between the receiving member 34 and the cable 40, the load on the cable that continuously acts can be reduced.

By the way, in this embodiment, the clutch plate 48 is set to return to the initial position S when the top portion 35C of the engaging piece 35 of the receiving member 34 passes the pin 48A. When the occupant leaves the seat cushion 12, the receiving member 34 releases the pressing force and moves upward. As described above, since the clutch plate 48 has returned to the initial position S, the pin 48A of the clutch plate 48 is arranged on the locus of movement of the top portion 35C of the engaging piece 35 when the receiving member 34 moves upward.

Therefore, when the occupant leaves the seat cushion 12, the clutch plate 48 is pushed by the top portion 35C of the engaging piece 35 of the receiving member 34 against the biasing force (in the direction of arrow C) of the third torsion spring and moves (rotates). Then, as shown in FIG. 10, when the top portion 35C of the engaging piece 35 of the receiving member 34 moving upward passes the pin 48A of the clutch plate 48, the pressing force of the engaging piece 35 of the receiving member 34 on the clutch plate 48 is released.

As a result, the clutch plate 48 is urged (restored) in the direction of arrow C by the third torsion spring, and the positional relationship between the pin 48A of the clutch plate 48 and the top portion 35C of the engaging piece 35 of the receiving member 34, which has been replaced by the passenger's seating as shown in FIG. 8, can be restored as shown in FIG. Here, the rotation of the clutch plate 48 in the arrow C direction is restricted by abutting against a stopper 45B provided on the rotating plate 45 .

In this embodiment, as shown in FIGS. 13 and 14, the lock portion 75 includes a recess 24A formed in the leg portion 24 and an engaging piece 84 that engages with the recess 24A. By engaging the engaging piece 84 with the recess 24A, the headrest 16 is maintained at the retracted position Q. In the present embodiment, the engaging portion 59A of the locking portion 59 is engaged with the concave portion 24A formed in the leg portion 24 of the headrest 16, so that the headrest 16 is maintained at the use position P.

That is, in the present embodiment, the engaging portion 59A of the locking portion 59 that locks the headrest 16 at the use position P and the engaging piece 84 of the locking portion 75 that locks the headrest 16 at the storage position Q are engaged with the recessed portion 24A formed in the leg portion 24 of the headrest 16. In other words, the headrest 16 can be locked at the use position P or the retracted position Q with one recess 24A.

Also, in the present embodiment, an example in which the vehicle seat is applied to the rear seat has been described, but it is of course possible to apply the vehicle seat to the front seat.

In addition, the present invention can be implemented with various modifications without departing from the scope of the invention. In addition, it goes without saying that the scope of rights of the present invention is not limited to the above embodiments.

REFERENCE SIGNS LIST 10 vehicle seat 12 seat cushion 14 seat back 14A upper end (upper end of seat back)
16 headrest (headrest body)
22 leg 22A recess 24 leg 24A recess (first locking portion)
34 receiving member 40 cable 43 clutch portion 45 rotating plate (rotating member, clutch portion)
45B stopper (second stopper, clutch portion)
46 shaft portion 48 clutch plate (clutch member, clutch portion)
59 lock part (second lock part)
59A engagement portion (second engagement portion, second lock portion)
70 coil spring (first biasing member)
72 coil spring (first biasing member)
75 lock part (first lock part)
84 engagement piece (first engagement portion, first lock portion)
86 torsion spring (fourth biasing member)
P Use position Q Storage position R Initial position S Initial position

Claims (9)

A seat cushion on which the passenger sits,
a seat back that supports the upper body of an occupant seated on the seat cushion;
a headrest disposed above the seat back and capable of moving up and down between a use position for supporting the head of an occupant seated on the seat cushion and a retracted position positioned below the use position;
with
a first locking portion that restricts movement of the headrest at the retracted position of the headrest;
a first biasing member that accumulates elastic energy in a state in which the movement of the headrest is restricted by the first locking portion and biases the headrest in a direction to move the headrest from the storage position to the use position;
a receiving member provided on the seat cushion and moved by being pressed when an occupant sits on the seat cushion;
a cable that is connected to the first lock portion and releases a locked state in which movement of the headrest is restricted by the first lock portion when tension is applied;
a clutch unit that is arranged on the movement trajectory of the receiving member, is pressed and moved by the receiving member that moves when the occupant sits on the seat, applies tension to the cable, and releases the state in which the tension is applied to the cable when the receiving member passes through;
A vehicle seat having 2. The vehicle seat according to claim 1, wherein the clutch portion is set to return to its initial position when the receiving member passes. The clutch part is
a rotating member provided rotatably around a shaft portion arranged along the seat width direction and having a free end side connected to the cable;
a clutch member that is rotatable about the shaft portion and that rotates together with the rotating member to apply tension to the cable or is rotatable relative to the rotating member;
a second biasing member provided on the rotating member for biasing the rotating member and the clutch member in a direction to return them to their initial positions;
a third biasing member provided on the clutch member and biasing the clutch member in a direction to return the clutch member to an initial position;
The vehicle seat according to claim 2, comprising: The clutch part is
a first stopper that restricts movement of the rotating member when the rotating member is biased by the second biasing member;
a second stopper that restricts movement of the clutch member when the clutch member is biased by the third biasing member;
4. The vehicle seat of claim 3, further comprising: The headrest includes a pair of tubular leg portions that are part of a frame member of a headrest body and that are exposed to the outside and attached to the upper end of the seatback,
The vehicle seat according to any one of claims 1 to 4, wherein the first biasing members are arranged in the pair of leg portions, and one of the first biasing members is in contact with the upper end side of the seat back. The first locking part is
a recess formed in the leg along a direction substantially perpendicular to the up-down direction of the seat;
a first engaging portion that engages with the recess at the retracted position of the headrest and restricts movement of the headrest;
The vehicle seat according to claim 5, comprising: 7. The vehicle seat according to claim 6, wherein the first locking portion further includes a fourth biasing member that biases the first engaging portion in a direction in which the first engaging portion maintains the state of engagement with the recess. 8. The vehicle seat according to any one of claims 1 to 7, further comprising a second locking portion that restricts movement of the headrest at the use position of the headrest. The second locking part is
a recess formed in the leg of the headrest along a direction substantially perpendicular to the up-down direction of the seat;
a second engaging portion that engages with the recess at the use position of the headrest and restricts movement of the headrest;
The vehicle seat according to claim 8, comprising: