JP4867546B2 - Vehicle seat - Google Patents

Description

  The present invention relates to, for example, a retractable vehicle seat, and relates to a vehicle seat configured such that a predetermined operation mechanism is switched by a cable pulled by rotating a seat back around a central axis of a reclining device.

As for this type of vehicle seat, for example, the technique disclosed in Patent Document 1 is already known. In this technique, when the seat back is tilted forward by the operation of the reclining device, the rotating arm attached to the seat back side rotates in the same direction as the seat back. As a result, the end of the rotary arm comes into contact with the link member provided on the seat cushion side, and the link member is rotated against the spring force. The cable is pulled by the rotation of the link member, and the predetermined operation mechanism (seat lock) is released. When the rotating arm further rotates, the end portion thereof is disengaged from the link member, the link member is rotated to the original state by the spring force, the cable pulling force is canceled, and the seat lock returns to the locked state.
JP 2002-76761 A

  The technique of canceling the pulling force against the cable after pulling the cable in this manner and then canceling the pulling force cannot be applied when it is desired to hold the lock while releasing the seat back. For example, in a double-holding type storage seat, the headrest is unlocked in conjunction with the seatback being tilted, and the technology that stores the seat more compactly by folding the headrest keeps the headrest unlocked. Want to. In order to cope with this, it can be considered that the cancel mechanism of Patent Document 1 is abolished. However, if the headrest is unlocked at an early timing of the operation of tilting the seat and the seat back continues to be tilted, an excessive pulling force is applied to the cable.

  An object of the present invention is to solve such a problem, and an object of the present invention is to release the lock of the headrest, for example, through a cable pulled by a rotation operation of the seat back, and maintain the state thereof, and then the subsequent seat back. It is to prevent an excessive tensile force from being applied to the cable even by the rotation of the cable.

The present invention is for achieving the above object, and is configured as follows.
A first invention is a vehicle seat configured such that a cable is pulled by rotating a seat back around a central axis of a reclining device, and a target operation mechanism is switched through the cable. Is set so as to be pulled via a link member that interlocks with the rotation operation of the seat back, and this link member is rotatable relative to the bracket fixed to the seat back side, and this link member The end of the outer cable in the cable is coupled to one of the bracket and the bracket, and the end of the inner cable in the cable is coupled to the other. By rotating the seat back around the center axis of the reclining device, the link member rotates with the bracket until halfway, and the subsequent link member rotates relative to the bracket to rotate the outer cable or inner cable. A pulling force is applied to the cable to complete the switching of the operation mechanism, and the cable is configured to rotate around the central axis of the reclining device together with the bracket while maintaining the rotation position .

Thus, based on the rotational state of the companion cormorants link member to the seat back rotational operation, after switching the actuation mechanism by means of the tension of the cable retains its switching state, and continues the rotating operation of the subsequent sheet back The cable is prevented from being pulled further. For example, this function can be applied to a vehicle seat in which the seat back is retracted forward about the central axis of the reclining device and stored, and the headrest is unlocked by the operating mechanism and the headrest can be folded. It is. In this case, it is possible to release the headrest lock and maintain the state at an early timing of the operation of tilting the seat back, and to prevent an excessive pulling force from being applied to the cable by the subsequent tilting of the seat back. it can.

In a second aspect based on the first aspect , the link member is rotatable around a support shaft provided at a position shifted from the central axis of the reclining device, and is provided at a fixed portion with respect to rotation of the seat back. A restricting portion capable of abutting against the stopper and an arc portion formed at a portion following the restricting portion are provided. When the seat back is rotated, the link member rotates around the central axis of the reclining device together with the bracket, and the restricting portion comes into contact with the stopper, so that the link member rotates relative to the bracket around the support shaft. The arc part comes into contact, and from this point, the arc part becomes an arc centered on the center axis of the reclining device and is held in contact with the stopper, and the link member and the bracket around the center axis of the reclining device remain in this state. It is comprised so that it may rotate.

  As described above, since the arc portion of the link member comes into contact with the stopper by the rotation operation of the seat back, the arc portion becomes an arc centered on the central axis of the reclining device, so that the link member rotates around the support shaft. Thus, the seat back can be rotated to the end without loosening or pulling too much of the cable pulled by.

Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view showing a retractable vehicle seat. FIG. 2 is a side view of the same vehicle seat. This vehicle seat is of a type that is stored by being flipped up from the folded state indicated by the solid line in FIGS. 1 and 2 to the outer side in the vehicle as indicated by the phantom line in FIG. The room space can be expanded.

  In the procedure for storing the seat, first, the seat back 20 is rotated forward around the central axis 32 of the reclining device 30 and folded into a state of being superimposed on the seat cushion 10 as shown by the solid lines in FIGS. Next, by rotating the seat cushion 10 around the hinge pin 16 of the tumble mechanism 14, the seat cushion 10 is flipped up together with the seat back 20 to the outer side in the vehicle, and the storage state shown by the phantom line in FIG.

  As shown in FIG. 2, the operating mechanism 28 for unlocking the headrest 24 is switched while the seatback 20 is being rotated forward around the central axis 32 of the reclining device 30. As a result, the headrest 24 that has been kept in use until then can be turned forward by rotating forward about the axis of the hinge pin 26. As a result, the sheet in the folded state as shown by the solid lines in FIGS. 1 and 2 can be made more compact.

  The operation mechanism 28 for releasing the lock of the headrest 24 is configured to be switched in conjunction with the rotation operation of the seat back 20. A specific configuration for switching the operating mechanism 28 is shown in FIGS. As is clear from these drawings, the cushion frame 12 of the seat cushion 10 and the back frame 22 of the seat back 20 are connected by a reclining device 30 (FIGS. 1 and 2). Therefore, by rotating the back frame 22 around the central axis 32 of the reclining device 30 with respect to the cushion frame 12, the seat back 20 can be brought down to the state shown by the solid lines in FIGS.

  A bracket 40 is fixed to the back frame 22 around the central shaft 32 of the reclining device 30. The bracket 40 includes a cable coupling portion 42 and a stopper piece 44. An end portion of the outer cable 71 in the pull type cable 70 is coupled to the cable coupling portion 42. The cable 70 is for transmitting a pulling force to the operating mechanism 28 by rotating the seat back 20 forward around the central axis 32 of the reclining device 30.

  A support shaft 58 is fixed to the bracket 40 (on the back frame 22 side) at a position shifted from the central shaft 32 of the reclining device 30. An intermediate part of the link member 50 is rotatably supported on the shaft of the support shaft 58. Accordingly, the link member 50 can rotate relative to the bracket 40 around the support shaft 58. Further, a cable coupling hole 52 is provided at one end of the link member 50, and the end of the inner cable 72 in the cable 70 is coupled thereto. Further, the link member 50 includes a restricting portion 54 formed on the outer peripheral side near the middle thereof, and an arc portion 56 formed on the outer peripheral side following the restricting portion 54.

  On the shaft of the support shaft 58, a torsion spring 60 having elasticity is provided between the link member 50 and the support shaft 58. Due to the elasticity of the torsion spring 60, the link member 50 is urged counterclockwise around the support shaft 58, and the side surface having the cable coupling hole 52 abuts against the stopper piece 44 of the bracket 40 and is received ( 3 and 4). Accordingly, the relative positional relationship between the bracket 40 and the link member 50 when the seat back 20 is in the state indicated by the imaginary line A in FIG. 2 is determined. As a result, the angle θ shown in FIG. 3 and the dimension L1 shown in FIG. 4 are kept constant. The angle θ is an angle formed by straight lines that individually connect the axis of the support shaft 58 and the cable coupling portion 42 of the bracket 40 and the cable coupling hole 52 of the link member 50. The dimension L1 is a distance between the cable coupling portion 42 of the bracket 40 and the cable coupling hole 52 of the link member 50.

  The stopper bracket 66 fixed to the cushion frame 12 includes a stopper 64 that can come into contact with the restriction portion 54 and the arc portion 56 of the link member 50. The stopper 64 is configured such that a cylindrical collar 64a is supported by a shaft 64b. This configuration is for reducing the resistance when the restricting portion 54 and the circular arc portion 56 of the link member 50 are moved in contact with the stopper 64 by the rotation of the collar 64a. The stopper bracket 66 fixed to the cushion frame 12 corresponds to a “fixed portion against rotation of the seat back” of the present invention.

  In the above configuration, when the reclining device 30 is operated to store the seat and the seat back 20 is rotated forward, the back frame 22 rotates around the central axis 32 of the reclining device 30. At this time, the link member 50 rotates around the central axis 32 of the reclining device 30 together with the bracket 40 from the state of FIG. 3 to the state of FIG. 4, and the angle θ and the dimension L1 do not change during this time. In the state shown in FIG. 4, the restricting portion 54 of the link member 50 comes into contact with the stopper 64.

  When the back frame 22 further rotates from the state shown in FIG. 4, the restricting portion 54 of the link member 50 moves to the state shown in FIG. 5 while being in contact with the stopper 64. Further, as shown in FIG. Move to contact. That is, the link member 50 at this time rotates around the support shaft 58 in a direction in which the angle θ shown in FIG. 3 is increased (a direction against the urging force of the torsion spring 60). As a result, the dimension L1 in FIG. 4 sequentially increases to the dimension L2 in FIG. 5 and the dimension L3 in FIG. 6, and the inner cable 72 of the cable 70 is pulled. As a result, the operating mechanism 28 for unlocking the headrest 24 shown in FIG.

  Thus, the link member 50 rotates around the support shaft 58 that is offset from the central shaft 32 of the reclining device 30, so that the contact with the stopper 64 moves from the restricting portion 54 to the arc portion 56. In this state, the arc portion 56 becomes an arc centered on the central axis 32 of the reclining device 30 (FIG. 6). Therefore, while the back frame 22 rotates from the state of FIG. 6 to the state of FIG. 7 and the seat back 20 is brought down, the arc portion 56 of the link member 50 remains in contact with the stopper 64 and the reclining device 30 Move around the central axis 32. Therefore, between the state of FIG. 6 and the state of FIG. 7, the dimension L3 is kept constant, and the inner cable 72 is not loosened or pulled excessively.

  In the storage seat of the type shown in FIGS. 1 and 2, by rotating the seat back 20 forward, the operating mechanism 28 is switched at an early stage to unlock the headrest 24, and the headrest 24 is tilted. preferable. However, it is necessary that the cable 70 (inner cable 72) is excessively pulled by the subsequent rotation of the seat back 20, and that it is not locked even if the headrest 24 is accidentally caused to fall down. In response to such a demand, in the present embodiment, the dimension L3 is kept constant from the state of FIG. 6 to the state of FIG. 7, and the inner cable 72 is not loosened or pulled any further. can do.

Although the best mode for carrying out the present invention has been described above with reference to the drawings, this embodiment can be easily changed or modified without departing from the spirit of the present invention.
First, as a format of the retractable sheet, the double holding type shown in FIG. 8 may be used. In the procedure for storing the seat, the seat cushion 10 is lifted on the rear side and rotated around the hinge pin 82 of the connecting member 80 to stand on the floor 18 as shown by the phantom line in FIG. Next, the seat back 20 is rotated forward around the central axis 32 of the reclining device 30, and falls into the trace space of the seat cushion 10 on the floor 18. During the rotational operation of the seat back 20, the operation mechanism 28 for releasing the lock of the headrest 24 is switched, and the headrest 24 is tilted forward around the axis of the hinge pin 26. As a result, the space on the floor 18 necessary for storing the seat back 20 becomes compact.

  Further, in the present embodiment, the operation mechanism 28 that is switched through the cable 70 by rotating the seat back 20 around the central axis 32 of the reclining device 30 is not limited to unlocking the headrest 24. For example, the present invention can be applied to unlocking a slide cushion of a walk-in type seat or unlocking a seat cushion such as a tumble seat and the floor side.

  Furthermore, in the embodiment shown in the drawings, as described above, the end of the outer cable 71 in the cable 70 is coupled to the cable coupling portion 42 of the bracket 40, and the end of the inner cable 72 is coupled to the cable coupling hole of the link member 50. 52. However, when guiding the cable 70 toward the slide lock of the seat cushion, for example, the end of the outer cable 71 can be coupled to the link member 50 side, and the end of the inner cable 72 can be coupled to the bracket 40 side. .

External perspective view showing retractable vehicle seat Side view of the same vehicle seat as FIG. Side view showing the previous stage of the operation mechanism switching operation Side view showing the initial stage of the operation switching operation Side view showing the intermediate stage of the operation switching operation Side view showing the end stage of the operation switching operation Side view showing the later stage of the operation switching operation Schematic showing a double holding type vehicle seat

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Seat cushion 20 Seat back 28 Actuation mechanism 30 Reclining device 32 Center shaft 40 Bracket 50 Link member 54 Restriction part 56 Arc part 58 Support shaft 64 Stopper 70 Cable

Claims (2)

A vehicle seat configured such that a cable is pulled by rotating the seat back around the central axis of the reclining device, and a target operation mechanism is switched through the cable,
The cable is set so as to be pulled via a link member that is interlocked with the rotation operation of the seat back, and this link member is rotatable relative to a bracket fixed to the seat back side. The end of the outer cable in the cable is connected to one of the member and the bracket, and the end of the inner cable in the cable is connected to the other. By rotating the seat back around the central axis of the reclining device, it is halfway The link member rotates together with the bracket, and the subsequent link member rotates relative to the bracket to apply a pulling force to the outer cable or inner cable of the cable to complete the switching of the operation mechanism , and the rotation The central axis of the reclining device with the bracket in place Vehicle seat is configured to rotate Ri. The vehicle seat according to claim 1,
The link member is rotatable around a support shaft provided at a position shifted from the center axis of the reclining device, and a restricting portion capable of contacting a stopper provided at a fixed position against rotation of the seat back, and the restriction The link member when the seat back is rotated is rotated around the central axis of the reclining device together with the bracket, and the restricting portion comes into contact with the stopper. On the other hand, the arc part contacts the stopper by rotating relatively around the support shaft, and from this point, the arc part becomes an arc centering on the central axis of the reclining device and is held in contact with the stopper. A vehicle seat configured such that the link member rotates together with the bracket around the central axis of the reclining device.

Images