JP4259226B2 - Retractable seat - Google Patents

Description

  The present invention relates to a retractable seat for a vehicle, and relates to a retractable seat capable of switching a seat to a use state or a storage state.

For this type of retractable sheet, for example, a technique disclosed in Patent Document 1 is already known. In this technique, the seat is supported so as to move up and down by the front and rear parallel links with respect to the floor side. Then, the rotation of the link can be restricted by the lock means provided on the seat side support portion of the rear link. By this rotation restriction, the seat can be held in the storage state in which the seat is stored in the storage recess on the floor side, or in the use state in which the sheet is positioned above the storage recess.
JP 2002-316567 A

In the conventional technology, when the retractable seat is in use, particularly when the seat is subjected to an impact load from the rear, the lock means or the link support portion is high in order to keep the link from rotating. It is required to ensure strength.
An object of the present invention is to increase the supporting force when the seat in use is subjected to a load from the rear, and to reduce the strength necessary for restricting the rotation of the front and rear legs. is there.

The present invention is for achieving the above object, and is configured as follows.
In the invention according to claim 1, the seat cushion is supported on the floor side by the front leg and the rear leg, and the seat cushion is rotated while keeping the front leg and the rear leg substantially parallel to each other. Is a retractable seat that can be switched between the use state and the retracted state, and is configured such that at least one of the floor side support portions of the front leg and the rear leg can move in a direction toward or away from the other. ing. Further, in the usage state of the seat, the interval between the support portions on the floor side is set larger than the interval between the support portions on the seat cushion side in the front leg and the rear leg. When the seat is switched from the use state to the retracted state, at least one of the floor side support portions of the front leg and the rear leg is moved in a direction approaching the other, and the front leg and the rear leg are substantially parallel to each other. In this state, the movement is stopped, and then the front leg and the rear leg are rotated until the seat is retracted .
According to this configuration, the front leg and the rear leg in the use state of the seat are in an “eight-letter” state in which the space between the support portions on the floor side is widened, and the substantially parallel state is collapsed, and the rotation is performed. The action which regulates is working. Therefore, the seat in the use state has a high supporting force with respect to the load in the front-rear direction, and the strength of the lock mechanism that restricts the rotation of the front leg and the rear leg may be small.
Further, when switching the seat from the use state to the retracted state, for example, the floor side support portion of the front leg is moved, and when the front leg and the rear leg are substantially parallel, the movement is temporarily stopped, so that the front side The leg and the rear leg are held substantially in parallel, and then the front leg and the rear leg are rotated to put the seat in the retracted state. For this reason, the operation when the sheet is switched from the use state to the storage state becomes smooth.

The invention according to claim 2 is the retractable seat according to claim 1, wherein the floor side support portion of the front leg and the rear leg is in a use state or a storage state of the seat. The driving means for switching to is provided.
As a result, the operation for switching the seat to the use state or the storage state is automated, and it is possible to omit the dedicated lock means for holding the seat in the use state by using the lock function of the drive means. Become.

The invention according to claim 3 is the retractable seat according to claim 1 , wherein at least one of the floor-side support portions of the front leg and the rear leg approaches or separates from the other. The drive means for moving to is provided.

The invention according to claim 4 is the retractable seat according to claim 2 , wherein the driving means for switching the seat to the use state or the storage state is a support portion on the floor side in the front leg and the rear leg. Of these, at least one of them also functions to move toward or away from the other.
Thereby, the arrangement space of a drive means can be restrained small.

  According to the retractable seat of the present invention, the support force is particularly high when a load is received from the rear in the use state, and the strength of the member that restricts the rotation of the front leg and the rear leg is small.

Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings. First, the first embodiment will be described with reference to FIGS.
FIG. 1 is a side view showing a retractable seat for a vehicle. FIG. 2 is a perspective view showing the skeleton (frame) of the retractable seat. The retractable seats shown in these drawings can adjust the tilt angle of the seat back 20 in the front-rear direction with respect to the seat cushion 10 by the reclining device 26. The reclining device 26 can be superposed on the seat cushion 10 by tilting the seat back 20 forward and can be held in that state. The seat cushion 10 is supported by a pair of left and right front legs 30 and a pair of left and right rear legs 50 with respect to the floor F side of the vehicle body.

  The cushion frame 12 of the seat cushion 10 and the back frame 22 of the seat back 20 are mainly composed of a pipe material formed in a U shape. The lower arm 16 fixed to the rear end portion of the cushion frame 12 and the upper arm 24 fixed to the lower end portion of the back frame 22 are connected via a reclining device 26. The cushion frame 12 includes reinforcing rods 14 and 15 before and after the cushion frame 12 (FIG. 2). The front leg 30 and the rear leg 50 connect the reinforcing rods 14 and 15 of the cushion frame 12 and the floor F side to form a four-bar link.

The pair of front legs 30 includes an individual shaft support portion 31 fixed to each upper end portion and one shaft support portion 32 fixed to the lower end portion. Each pivot support 31 at the upper end is connected to a pivot bracket 14 a of the reinforcing rod 14. The shaft support portion 32 at the lower end is connected to a pair of left and right shaft support brackets 36 fixed on the slide base 34 on the floor F side. The slide table 34 can be moved in the front-rear direction along the upper surface of the floor F with a certain stroke.
The pair of rear legs 50 includes shaft support portions 51 and 52 fixed to both upper and lower ends. Each shaft support portion 51 at the upper end is connected to a shaft support bracket 15 a of the reinforcing rod 15. Each pivot support 52 at the lower end is connected to a pair of left and right pivot support brackets 54 fixed on the floor F.

In the front leg 30, the connecting portion between the shaft support portion 31 at the upper end and the shaft support bracket 14 a on the cushion frame 12 side corresponds to the “support portion on the seat cushion side in the front leg” of the present invention. Similarly, the connecting portion between the shaft support portion 32 at the lower end portion of the front leg 30 and the shaft support bracket 36 on the slide base 34 side corresponds to the “floor side support portion of the front leg” of the present invention. Further, in the rear leg 50, the connecting portion between the shaft support portion 51 at the upper end and the shaft support bracket 15a on the cushion frame 12 side corresponds to the “support portion on the seat cushion side in the rear leg” of the present invention. Similarly, the connecting portion between the shaft support portion 52 at the lower end of the rear leg 50 and the shaft support bracket 54 on the floor F side corresponds to the “floor side support portion of the rear leg” of the present invention.
In the use state of the seat shown in FIG. 1, the interval between the support portions on the floor F side is larger than the interval between the support portions on the seat cushion 10 side in the front leg 30 and the rear leg 50. That is, the front leg 30 and the rear leg 50 in this state are in an “eight-letter” state in which the space between the support portions on the floor F side is widened in a side view of the seat.

  On the slide table 34 on which the floor F side support portion of the front leg 30 is located, there is a drive means 40 for storing so that the seat is brought down to the floor F side or returned to the original state. (FIG. 1). The drive means 40 includes a motor 42 and a differential device 44, which are mounted on a slide base 34. The motor 42 can be controlled to rotate in both forward and reverse directions, and the rotation is converted into the reciprocating movement of the screw rod 46 in the differential device 44. The tip of the screw rod 46 is connected to a connecting arm 32 a fixed to the outer periphery of the shaft support 32 at the lower end of the front leg 30.

  At the front position of the slide table 34, a so-called slide drive means 60 for moving the slide table 34 in the front-rear direction is provided. The driving means 60 also includes a motor (not shown) and a differential device 62. By driving the motor of the driving means 60, the screw rod 64 of the differential device 62 rotates forward and backward around its axis. The screw rod 64 meshes with the screw block 38 fixed on the slide base 34 in a penetrating state. Therefore, by controlling the rotation of the 60 screw rods 64, the slide base 34 can be moved in the front-rear direction.

Next, the movement when the seat is switched from the use state to the retracted state will be described mainly with reference to FIGS.
In the use state of the seat shown in FIG. 1, when an operation for storage is performed, the seat back 20 starts to tilt forward as shown in FIG. In parallel with this, the motor of the slide drive means 60 is started, and the slide table 34 moves rearward by the rotation of the screw rod 64. As a result, the floor F side support portion (the shaft support portion 32) of the front leg 30 approaches the floor F side support portion (the shaft support portion 52) of the rear leg 50. That is, the front leg 30 and the rear leg 50 are changed from the “eight-shaped” state in which the space between the support portions on the floor F side is widened to a substantially parallel state (parallel link state) as shown in FIG. Note that the motor of the driving means 60 stops when the slide base 34 moves to the position shown in FIG.

  In the state of FIG. 3, the motor 42 of the storing drive means 40 is now started and operates so that the screw rod 46 is pushed backward. As a result, the shaft support portion 32 of the front leg 30 receives a rotational force in the backward direction (clockwise direction in FIG. 3) through the connecting arm 32a. As a result, the front leg 30 and the rear leg 50 rotate backward in a parallel link state, and the entire seat falls to the floor F side as shown in FIG. At this time, the motor 42 of the driving means 40 stops. Note that the seat back 20 at this time is tilted in a state of being superimposed on the seat cushion 10. FIG. 4 shows the storage state of the sheet, and the storage state of the sheet is maintained by the lock function of the driving means 40 and 60.

  When the operation for returning to the use state is performed in the seat retracted state shown in FIG. 4, first, the motor 42 of the driving means 40 rotates in the opposite direction to that during the retracting operation, and the screw rod 46 is pulled back forward. In conjunction with this, the shaft support portion 32 of the front leg 30 rotates forward (counterclockwise in FIG. 4), and both the front leg 30 and the rear leg 50 rotate forward. Thereby, as shown in FIG. 3, the entire seat rises from the floor F side, and the motor 42 stops here.

  Subsequently, the motor of the driving means 60 starts to rotate in the direction opposite to that during the storing operation, and the slide rod 34 moves forward from the position of FIG. As a result, the floor-F support portion of the front leg 30 is separated from the floor-F support portion of the rear leg 50. As a result, the front leg 30 and the rear leg 50 change from a state substantially parallel to each other to an “eight-letter” state in which the support portion on the floor F side is wider than the support portion on the seat cushion 10 side. The motor of the driving means 60 stops when the slide base 34 returns to the original position shown in FIG. 1, and the seat is in a use state. In this use state, the seat back 20 is also returned to the original standing position by the operation of the reclining device 26.

  Both the drive means 40 and 60 use screw rods 46 and 64, and have a mechanism that prevents reverse transmission of the operating force from each output side to the input side. Accordingly, these driving means 40 and 60 both perform a locking function and hold the seat in the use state shown in FIG. Further, as described above, the front leg 30 and the rear leg 50 in this use state are broken in the parallel state at the time of individual rotation, and the “eight shape” in which the space between the support portions on the floor F side is widened. It is in a state. Therefore, the seat in the use state has a high supporting force with respect to the load applied from the front-rear direction, and the strength as the lock mechanism by the driving means 40 and 60 is small.

Next, a second embodiment of the present invention will be described with reference to FIG.
FIG. 5 is a side view showing the sheet according to the second embodiment. In addition, about Embodiment 2 and Embodiment 3 and 4 demonstrated later, the seat back of a sheet | seat is abbreviate | omitted in each drawing. Now, as shown in FIG. 5, the second embodiment is an example in which two driving means are arranged separately on the front leg side and the rear leg side. In other words, the driving means 160 for sliding is arranged on the support portion on the floor F side of the front leg 30, and the driving means 140 for storage is arranged on the support portion on the floor F side of the rear leg 50. .

  The lower shaft support portion 32 of the front leg 30 is connected to a slider 72 that is guided by a guide plate 70 on the floor F and is movable in the front-rear direction. The slide driving means 160 can move the slider 72 in the front-rear direction by forward and reverse rotation of the screw rod 164 based on the motor drive. Thereby, the floor F side support part of the front leg 30 moves between the solid line position and the virtual line position of FIG. On the other hand, the storage driving means 140 can rotate the lower shaft support portion 52 of the rear leg 50 around its axis by driving the motor 142.

  In the second embodiment, when an operation for storing a sheet is performed, the slider 72 is guided by the guide plate 70 and moved backward by the rotation of the screw rod 164 in the driving unit 160 for sliding. As a result, as shown by the phantom line in FIG. 5, the front leg 30 is in a state where the support part on the floor F side approaches the support part on the floor F side of the rear leg 50 and is substantially parallel to the rear leg 50. become. Therefore, as in the first embodiment, the front leg 30 and the rear leg 50 are changed from the “eight-letter” state in which the distance between the floor F-side support portions is increased to the parallel link state. Subsequently, the motor 142 of the driving means 140 is started, and the shaft support portion 52 of the rear leg 50 receives a rotational force in the rearward direction (clockwise direction in FIG. 5). As a result, the front leg 30 and the rear leg 50 rotate rearward in a parallel link state, the entire seat falls to the floor F side as shown by the phantom line in FIG. 5, and the seat enters the retracted state.

  Further, when the operation of returning the seat to the use state is performed, the respective motors rotate in the reverse direction in the order of the driving means 140 and 160 in the reverse order of the storage, and the seat is brought into the use state shown by the solid line in FIG. Become. As in the case of the first embodiment, the front leg 30 and the rear leg 50 in this use state are “eight-shaped” in which the interval between the support portions on the floor F side is increased from the parallel link state at the time of individual rotation. State. The driving means 140 and 160 also have a lock function, and hold the sheet in a use state or a storage state.

Next, a third embodiment of the present invention will be described with reference to FIGS.
6A and 6B are side views showing the usage state of the sheet in the third embodiment, where FIG. 6A is an overall view and FIG. 6B is a partially enlarged view. FIG. 7 is an exploded perspective view showing the structure of the floor side support portion of the front leg in FIG. 8A and 8B are side views showing the storage operation state of the seat, where FIG. 8A is an overall view and FIG. 8B is a partially enlarged view. FIGS. 9A and 9B are side views showing the storage operation state of the seat, where FIG. 9A is an overall view and FIG. 9B is a partially enlarged view. The third embodiment is an example in which a single drive unit is used. That is, as shown in FIG. 6, only the driving means 240 is disposed at the front position of the support portion on the floor F side in the front leg 30.

  An auxiliary member 80 is fixed to the lower shaft support 32 of the front leg 30 in the third embodiment. On the floor F, a pair of left and right guide plates 82 are arranged. These guide plates 82 are formed with guide holes 84 extending in the front-rear direction, and both guide holes 84 are respectively provided with arc-shaped end portions 84a bent downward on the rear side. Then, both end portions of the shaft support portion 32 and the auxiliary member 80 are slidably engaged with the guide holes 84 of both guide plates 82.

A stopper 86 is rotatably attached to the inner side of both guide plates 82 by a shaft 87. A spring 88 is hung between the stopper 86 and the guide plates 82. Due to the elasticity of the spring 88, the stopper 86 is held at the rotational position shown in FIG. In this state, the stopper 86 has a flat portion 86a at the upper edge located at a boundary portion with the end portion 84a behind the guide hole 84.
The driving unit 240 has the same structure as the driving unit 40 in the first embodiment, and the forward / reverse rotation of the motor 242 is converted into the reciprocating movement of the screw rod 246. The tip of the screw rod 246 is connected to a connecting arm 32 a fixed to the outer periphery of the shaft support 32.

  In the state of use of the seat shown in FIG. 6, when an operation for storage is performed, the screw rod 246 is operated to be pushed backward by driving of the driving means 240. In conjunction with this, as shown in FIG. 8, the shaft support portion 32 of the front leg 30 is guided by the guide hole 84 together with the auxiliary member 80 and moves rearward. That is, the floor F-side support portion of the front leg 30 approaches the floor F-side support portion of the rear leg 50, and the space between the floor F-side support portions of the front leg 30 and the rear leg 50 is widened. From the “eighth-letter” state, the state becomes substantially parallel to each other as shown in FIG. Note that both ends of the auxiliary member 80 in this state are placed on the flat portion 86a of the stopper 86 in the guide hole 84, as is apparent from FIG. 8B.

  The shaft support 32 receives a rotational force in the rearward direction through the connecting arm 32a. For this reason, when the screw rod 246 is further pushed out from the state of FIG. 8, the shaft support portion 32 rotates rearward while causing the auxiliary member 80 to enter the end portion 84 a of the guide hole 84. As a result, the front leg 30 and the rear leg 50 rotate rearward, and the entire seat falls to the floor F side as shown in FIG. 9, and the seat is in the retracted state. Further, as the auxiliary member 80 enters the end portion 84a of the guide hole 84, the stopper 86 rotates around the shaft 87 against the force of the spring 88, resulting in the state shown in FIG. 9B. That is, the stopper 86 in this state restricts the axial support portion 32 from moving forward along the guide hole 84.

  When the operation of returning the seat from the retracted state to the in-use state is performed and the screw rod 246 of the driving means 240 starts to be pulled back forward, the shaft support portion 32 is pulled backward through the connecting arm 32a. As a result, the shaft support portion 32 rotates from the state shown in FIG. 9 with the stopper 86 as a fulcrum, and the auxiliary member 80 retreats from the end portion 84 a of the guide hole 84. Accordingly, the stopper 86 is rotated again to the state of FIG. 8 by the action of the spring 88, and the movement restriction of the shaft support portion 32 by the stopper 86 is released. Thereafter, the shaft support 32 returns to the state of FIG. 6 together with the auxiliary member 80 by the operation of the screw rod 246. As a result, the front leg 30 and the rear leg 50 return from the substantially parallel state to the “eight-shaped” state in which the space between the support portions on the floor F side is wider than the support portions on the seat cushion 10 side. Is in use. The driving unit 240 also has a locking function as in the driving unit 40 in the first embodiment, and holds the seat in the use state or the storage state.

Next, a fourth embodiment of the present invention will be described with reference to FIGS.
FIG. 10 is a side view illustrating a usage state of the sheet in the fourth embodiment. FIG. 11 is a side view showing the storage state of the sheet of FIG. The fourth embodiment is an example in which the driving means for switching the sheet to the use state or the storage state is eliminated. In this embodiment, the lower shaft support portion 32 of the front leg 30 is supported so as to be movable in the front-rear direction with respect to the guide hole 92 of the guide plate 90 fixed on the floor F. Further, the shaft support portion 32 can lock the movement and rotation in the front-rear direction by a spring 94 with a lock function, and the distance between the hooks 94 a at both ends can be expanded and contracted by the elasticity of the spring 94. One of the hooks 94a is coupled to the shaft support portion 32, and the other is coupled to a member on the floor F side.

  Therefore, in order to change the seat from the use state of FIG. 10 to the retracted state, the lock of the spring 94 with the lock function is released and the distance between the hooks 94a is extended. Thereby, the shaft support portion 32 of the front leg 30 moves rearward along the guide hole 92, and the front leg 30 and the rear leg 50 rotate rearward. As a result, the entire sheet falls to the floor F side, and the sheet is in the stored state shown in FIG. When the seat is returned to the use state, the distance between the hooks 94 a is reduced, so that the entire seat rises from the floor F side, and the shaft support portion 32 moves forward along the guide hole 92. By locking in this state, the sheet is held in the use state shown in FIG.

Side view showing usage state of retractable seat (Embodiment 1) A perspective view showing a skeleton (frame) of a retractable seat (Embodiment 1) Side view showing retracted operation state of retractable seat (Embodiment 1) Side view showing a retracted state of a retractable sheet (Embodiment 1) Side view showing retractable seat (Embodiment 2) Side view showing usage state of retractable seat (Embodiment 3) An exploded perspective view showing the structure of the floor side support portion of the front leg (Embodiment 3) Side view showing retractable operation state of retractable seat (Embodiment 3) Side view showing retractable operation state of retractable seat (Embodiment 3) Side view showing usage state of retractable seat (Embodiment 4) Side view showing a retracted state of a retractable sheet (Embodiment 4)

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Seat cushion 30 Front leg 40 Driving means 50 Rear leg 60 Driving means F Floor

Claims (4)

The seat cushion is supported on the floor side by the front legs and the rear legs, and the seat is switched between the use state and the retracted state by rotating the front and rear legs while keeping them substantially parallel. The retractable seat is configured so that at least one of the floor side support portions of the front leg and the rear leg can move in a direction approaching or moving away from the other. When the seat is switched from the use state to the retracted state, the floor side support portion is set to be larger than the seat cushion side support portion of the rear leg. Move at least one of the floor side support parts closer to the other and stop moving with the front and rear legs almost parallel , Retractable seat that is configured to rotate the front leg and the rear leg until then the sheet is retracted state. The retractable seat according to claim 1, wherein the floor side support portion of the front leg and the rear leg includes a driving means for switching the seat to a use state or a storage state. Retractable sheet. The retractable seat according to claim 1, further comprising a driving means for moving at least one of the front-side and rear-leg support portions on the floor side in a direction approaching or separating from the other. Retractable sheet. 3. The retractable seat according to claim 2, wherein the driving means for switching the seat to the use state or the retracted state has at least one of the floor side support portions of the front leg and the rear leg with respect to the other. Retractable seat that also functions to move in the direction of approaching or moving away .

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