JP4403953B2 - Retractable seat for vehicle - Google Patents

Description

  The present invention relates to a retractable seat for a vehicle. Specifically, by performing a retracting operation in which the seat back is tilted toward the seat cushion, the seat cushion is lowered while being moved forward of the vehicle, that is, in a direction away from the seat back, and the seat back is superimposed on the seat cushion to be in the retracted state. The present invention relates to a retractable vehicle seat.

2. Description of the Related Art Conventionally, some vehicles such as automobiles employ a so-called retractable seat so as to ensure as much space as possible in a limited space in a vehicle and a housing space. That is, according to the retractable seat, when the seat is not used, the seat back and the seat cushion of the seat are folded, and the entire seat is placed in the retracted position where the seat is depressed forward. be able to. As a result, an empty space that is removed from the normal posture position (position where the seat can be seated) of the seat can be secured as a living space or a storage space.
Specifically, for example, the technique disclosed in Patent Document 1 described later can be given. In addition, the configuration which is a characteristic part of this conventional technique is shown in a simplified manner in FIGS. In this disclosure, a portion closer to the front side of the seat cushion C is pin-coupled to the vehicle body floor F via the front link L, and is supported so as to be rotatable with respect to the vehicle body floor F. Further, the rear side portion of the seat cushion C is supported as being connected by the connecting member J to the lower side portion of the seat back B. Specifically, the connecting member J is rigidly fixed so as not to rotate relative to the seat cushion C, and is pin-coupled to the seat back B at a position spaced upward from the rotation center position of the recliner R. Connected state. Therefore, when the seat back B is retracted from the normal posture position toward the front of the vehicle, that is, the seat cushion C with the recliner R as a rotation center, the connection of the connecting member J connected to the seat back B is performed. The part j is also displaced so as to sink forward. Thereby, the seat cushion C is pushed forward as the connecting member J is displaced. Specifically, the seat cushion C receives the swinging action of the front link L and moves so as to sink forward. Then, the seat back B that has been laid down is superimposed on the upper part of the seat cushion C that has been sunk to a predetermined storage position. As described above, the sheet can be placed in the storage position in a folded state.

JP 2004-175300 A

By the way, in recent years, with the need for a vehicle package such as a thinner seat back, it has been required to make the folding thickness of the seat back and the seat cushion in the seat retracted state as thin as possible. However, in the above-described conventional technology, by adopting a configuration in which the folding thickness of the sheet is effectively reduced, the arrangement position and the operation region of the connecting member J that is the folding mechanism are affected, and the design properties of the entire sheet May be damaged or the occupant's living space may be narrowed.
That is, first, in order to set the folding position of the seat back B as close as possible to the seat cushion C side as a low position, the recliner R serving as a rotation center when the seat back B is tilted is disposed. It is necessary to set the position as a low position close to the seat cushion C side. On the other hand, the shape of the seat cushion C is generally formed as a thick-walled shape in which a portion closer to the front swells upward than other portions because of its functional reasons. Therefore, if the seat back B that has been tilted directly interferes with the swollen shape portion c of the seat cushion C, the amount of tilting of the seat back B is insufficient, even though the amount of tilt of the seat back B is insufficient. It will be regulated. Therefore, in order to solve this problem, it is necessary to move the seat cushion C sufficiently to the front position so that the swollen shape portion c does not interfere with the seat back B in the middle of falling down. Become. Specifically, in order to move the seat cushion C to a more forward position, the connecting portion j of the connecting member J with the seat back B is set as a position sufficiently separated from the rotation center of the recliner R. There must be. That is, according to the configuration of the conventional technique, the maximum forward displacement amount (movement amount) of the seat cushion C is determined by the position of the connection portion j of the connection member J with the seat back B and the rotation axis of the recliner R. This is because the distance is determined as the distance between the two positions.
Therefore, as described above, by effectively reducing the folding thickness of the seat back B and the seat cushion C, the position of the connecting portion j of the connecting member J with the seat back B is correspondingly increased. The recliner R is disposed at a position far away from the position of the rotation shaft. Furthermore, since the connecting portion j is separated, the operating region of the connecting member J is widened accordingly. Therefore, the shape necessary for the protective cover Co that is mounted to cover and protect the connecting member J from outside is increased by the separated dimension and the expanded dimension of the operation area. Thereby, the design property as the whole sheet | seat is impaired, and the increase in this manufacturing cost is caused. Furthermore, the occupant's living space is narrowed by increasing the size of the protective cover Co.

  The present invention was devised as a solution to the above-described problems, and the problem to be solved by the present invention is to fold without retracting the connecting member for folding the retractable sheet from the sheet design. It is to reduce the thickness of the.

In order to solve the above problems, the retractable seat for a vehicle of the present invention takes the following means.
First , in the first invention, the seat cushion connected to the seat back via the link mechanism sinks downward by rotating the seat back forward and rotating around the rotation axis of the recliner with respect to the vehicle body floor. conjunction with been engineered to, seat back to the top of the seat cushion Ru stowable vehicle seat der in which to store state convolved. The link mechanism is configured such that a driving node that is rotatably linked to a seat back and a driven node that is rotatably linked to a seat cushion are rotatably linked to each other. The driving node is set at a position where the first node serving as a link connection point with the seat back is deviated radially outward from the rotation axis of the recliner. The follower is configured to link the rear part of the seat cushion to the vehicle body floor, and is linked to the rear part of the seat cushion, the vehicle body floor, and the driving node, so that the seat back can be rotated forward. Along with this, the link movement of the seat cushion is performed in the direction in which the seat cushion is sunk downward with respect to the vehicle body floor in conjunction with the link movement of the prime mover.
According to the first aspect of the present invention, the first node, which is the link connection point between the seat back and the driving node, is rotated around the rotation axis of the recliner by rotating the seat back forward and rotating around the rotation axis of the recliner. Rotate. As a result, the follower link linked to the prime mover is linked to the movement of the prime mover, and the seat cushion is operated to sink downward with respect to the vehicle floor. Then, when the seat back is brought down on the upper part of the seat cushion sinking to the lower side, the seat back and the seat cushion are folded so as to overlap each other. At this time, the forward rotation of the seat back is the amount of movement in which the seat back and the seat cushion approach in the height direction by the link mechanism performing a link motion in a manner that the link mechanism moves the driving and driven nodes to bend. Absorbs.

Next , according to a second aspect, in the first aspect described above, the driven node includes a second node that is a link connection point with the seat cushion, and a third node that is a link connection point with the vehicle body floor. Is set to be larger than the distance dimension between the third node and the fourth node that is the link connection point with the driving node.
According to the second aspect of the invention, since the dimensional ratio between the nodes of the driven node is set as described above, the seat cushion sinking movement amount with respect to the seatback forward tilting rotation movement amount becomes larger. .

Next, a third invention, in the first or second invention described above, the driving links by rotating falling forward the seat back around the rotation shaft of the recliner, the link connection point between the seat back A certain first node is raised. The driven node has a third node that is a link connection point with the vehicle body floor, a second node that is a link connection point with the seat cushion, and a fourth node that is a link connection point with the driving node. It is arranged at the position between.
According to the third aspect of the invention, the position at which the first node, which is the link connection point between the driving node and the seat back, is pulled up with the forward rotation of the seat back, that is, the rear region of the recliner rotation shaft. As a result, the amount of protrusion of the prime mover to the front side can be kept small.

Next, a fourth invention is the first or second invention described above, the driving links by rotating falling forward the seat back around the rotation shaft of the recliner, the link connection point between the seat back A certain first node is pushed down. The driven node has a fourth node that is a link connection point with the driving node, a second node that is a link connection point with the seat cushion, and a third node that is a link connection point with the vehicle body floor. It is arranged at the position between.
According to the fourth aspect of the invention, the position at which the first node, which is the link connection point between the driving node and the seat back, is pushed down with the forward rotation of the seat back, that is, the region on the front side of the recliner rotation shaft. As a result, the amount of protrusion of the prime mover to the rear side can be kept small.

The present invention can obtain the following effects by taking the above-described means.
First , according to the first aspect of the present invention, the link mechanism that operates to cause the seat cushion to sink downward is interlocked with the forward tilting rotation of the seat back. With this configuration, it is possible to keep the operating area of the link mechanism small and prevent it from popping out of the seat design, and to make the seat back and the seat cushion close to each other in the height direction to make it small (thin ) Tatamikomeru as can be Rukoto.
Further , according to the second invention , the seat back is tilted forward by setting the dimensional ratio (link ratio) between the nodes of the driven node so that the link momentum of the driven node is increased with respect to the link momentum of the driving node. In conjunction with the rotation, the seat cushion can be sunk further downward .
Furthermore , according to the third aspect of the present invention, the connecting point (first node) between the driving node and the seat back passes through the rear region of the recliner rotating shaft when the seat back is rotated forward. by which it is adapted kept small overhang of the front section can kept small Rukoto the shape of the front portion of the protective cover covering the operation area of the link mechanism.
Further , according to the fourth aspect of the present invention, the connecting point (first node) between the driving node and the seat back passes through the region on the front side of the rotation axis of the recliner when the seat back is rotated forward. by which is adapted kept small overhang amount of rearward section may kept small Rukoto the shape of the rear portion of the protective cover covering the operation area of the link mechanism.

  Embodiments of the best mode for carrying out the present invention will be described below with reference to the drawings.

  First, the configuration of the retractable seat 10 for a vehicle according to the first embodiment will be described with reference to FIGS. 1 is a side view showing a normal posture state of the retractable seat 10 for a vehicle, FIG. 2 is a side view showing a halfway position state in which the seat back 20 is tilted forward from the state of FIG. 1, and FIG. It is a side view which shows the retractable vehicle seat 10 made.

The vehicle retractable seat 10 (hereinafter referred to as the seat 10) of the present embodiment is in a state in which the seat back 20 and the seat cushion 30 of the seat 10 are folded when the seat 10 is not used, for example. In this configuration, the vehicle can be stored in a state where it is sunk in front of the vehicle. Specifically, as well shown in FIGS. 1 to 3, the locking mechanism (not shown) provided to the seat 10 is released, and the seat back 20 is placed on the seat cushion 30 side, that is, in front of the vehicle (shown in FIG. 1). The link mechanism 50 that connects the seat back 20 and the seat cushion 30 is operated by moving the seat cushion 20 in the direction of the arrow), and moves the seat cushion 30 away from the seat back 20, that is, forward of the vehicle. While descending. Then, the seat back 20 that is brought down is superimposed on the seat cushion 30 that has moved to the storage position by the above movement. Thereby, the whole seat | sheet 10 can be arrange | positioned in the storage position which was sunk in the vehicle front.
Hereinafter, the details of each component of the seat 10 will be described. In the text, “front” means the front of the vehicle, that is, the left direction in the drawing shown in FIGS. Further, “rear” is the reverse direction of “front”. Further, in the text, “upward” means the upper side in the drawing shown in FIGS. “Down” is the opposite direction of “Up”. In the following description, each member connected to the seat cushion 30 and the seat back 20 has a pair of left and right configurations or a symmetrical shape unless otherwise specified.

First, the seat 10 as a whole has a seat back 20 that serves as a backrest portion of a seated occupant and a seat cushion 30 that serves as a seating portion, and the seat back 20 and the seat cushion 30 are connected by a link mechanism 50. Has been.
Specifically, as shown in FIG. 1, the seat back 20 is pin-coupled to a recliner 21 arranged in a state of being fixed to the vehicle body floor F at the lower end side thereof and is rotatably supported. . Here, the recliner 21 is arranged at a fixed position on the vehicle body floor F as a low position close to the seat cushion 30 side in order to arrange the seat back 20 as low as possible in the retracted state of the seat 10 (see FIG. 3). It is installed. Accordingly, the seat back 20 can rotate relative to the vehicle body floor F around the rotation shaft 22 of the recliner 21 disposed at the fixed position, as well shown in FIGS. It is in a state.
Further, as shown in FIG. 1, the seat cushion 30 has a front link 40 connected to a connecting portion 30a closer to the front side, and is supported by the vehicle body floor F via the front link 40. ing. Specifically, the front link 40 has a node 40a on the upper end side that is pin-coupled to the seat cushion 30 and a node 40b on the lower end side that is pin-coupled to the vehicle body floor F. In addition, a link mechanism 50 is connected to a connecting portion 30b near the rear side of the seat cushion 30, and the connecting portion 30b is supported by the seat back 20 via the link mechanism 50.

Next, the structure of the link mechanism 50 that connects the seat back 20 and the seat cushion 30 will be described. As shown in FIG. 1, the link mechanism 50 includes, as a whole, a driving node 51 having one node connected to the seat back 20 side, and a driven node 52 having one node connected to the seat cushion 30 side. The driving node 51 and the driven node 52 are connected to each other at other nodes.
More specifically, in the driving node 51, the first node 51a on the upper end side is pin-coupled to the seatback 20 with the portion within the radial size range of the recliner 21 as the connecting portion 20a. . Specifically, the first node 51 a is disposed as a position spaced radially downward from the rotation shaft 22 of the recliner 21. In addition, the driving node 51 is formed in a square shape in which the fourth node 51b side on the lower end side is bent backward, with the substantially intermediate portion thereof being a bending point.
Next, in the follower node 52, the second node 52a on the upper end side is pin-coupled to the seat cushion 30 with a portion closer to the rear side of the seat cushion 30 as a connection portion 30b. Further, the driven node 52 is pin-coupled to a fixed position of the vehicle body floor F with the portion closer to the lower side as a third node 52b. Further, the follower node 52 is pin-coupled to the fourth node 51 b on the lower end side of the driving node 51 with the lower end portion serving as the fourth node 52 c.
Further, the link mechanism 50 is locked in a state in which each node cannot be rotated by its action when a lock mechanism (not shown) provided on the seat 10 is locked. Accordingly, as the displacement of each node of the link mechanism 50 is constrained, the displacement of each node of the front link 40 having the driven node 52 as the opposite node of the four-node link is also constrained. Thus, in the locked state, the seat cushion 30 and the seat back 20 are held by the respective connecting members such as the front link 40 and the link mechanism 50.

Therefore, the seat 10 to which the link mechanism 50 having the above-described configuration is assembled is a state in which the seat back 20 and the seat cushion 30 are folded by performing a storing operation in which the seat back 20 is tilted forward with the recliner 21 as a rotation center. As shown in FIG.
That is, when the lock mechanism provided in the seat 10 is released and the seat back 20 is tilted forward (in the direction of the arrow shown in FIG. 1) and the storage operation is performed, as shown in FIG. One nodal point 51 a is displaced in a direction in which it is pulled up around the rotation shaft 22 of the recliner 21. Then, the fourth node 52c of the driven node 52 that is pin-coupled to the fourth node 51b of the driving node 51 is displaced in the direction of being pulled up in response to the displacement of the driving node 51. Specifically, the driven node 52 is displaced in a direction in which the fourth node 52c is pulled up around the third node 52b, with the third node 52b as the rotation center. As a result, the second node 52a of the driven node 52 is displaced in a direction in which it is pushed down around the third node 52b. Then, the seat cushion 30 is pushed forward in accordance with the displacement of the second node 52a of the driven node 52. Specifically, the seat cushion 30 is moved so as to sink forward by receiving the swinging action of the front link 40.

Here, the forward and downward movement amount of the seat cushion 30 is the pin coupling position of the driving link 51 with respect to the driven link 52 of the link mechanism 50, that is, the driven link that transmits the movement input from the driving link 51 to the seat cushion 30. Determined by a leverage ratio of 52. Specifically, as shown in FIG. 2, the lever ratio is determined from the third node 52b of the driven node 52 to the fourth node 52c pin-coupled to the driving node 51 from the support point. It is determined as a dimensional ratio between the dimension a and the dimension b from the support point to the second node 52a pin-coupled to the connecting portion 30b of the seat cushion 30. Therefore, by appropriately determining this dimensional ratio (leverage ratio), the seat cushion 30 can be moved to a desired lower front position. Here, generally, the shape of the seat cushion 30 is formed as a shape in which a portion closer to the front swells upward than other portions due to functional reasons. Therefore, when the seat back 20 that has been tilted interferes with the bulged shape portion of the seat cushion 30, the movement of the seat back 20 is restricted with an insufficient amount of tilt. Therefore, in consideration of the above points, the lever ratio of the link mechanism 50 is set so that the seat back 20 can be moved to a fully depressed position as shown in FIG. The set value is such that the shape portion of the seat cushion 30 that is swollen up in accordance with the retracting operation of tilting the seat is avoided.
The change in the relative height between the connecting portion 20a of the seat back 20 and the connecting portion 30b of the seat cushion 30 due to the forward and downward movement of the seat cushion 30 is determined by the driving node 51 and the driven member of the link mechanism 50. It is converted as a displacement amount associated with the relative rotation of the node 52. Therefore, the lever 30 of the link mechanism 50 can move the connecting portion 30b of the seat cushion 30 further away from the rotating shaft 22 of the recliner 21 than the connecting portion 20a of the seat back 20. Become.

  Next, a protective cover 60 that is normally mounted as a cover for protecting the recliner 21 is mounted on the seat 10 so that the operating region of the link mechanism 50 can be covered and protected. Specifically, the protective cover 60 has a size capable of covering and protecting the operating region of the component members of the link mechanism 50 that protrudes outside from the radial size of the seat cushion 30 and the recliner 21. Here, in the link mechanism 50, the driving node 51 and the driven node 52 are connected on the lower side of the seat cushion 30, and when the movement of the seat back 20 is accompanied, the link mechanism 50 as a whole is on the lower side of the seat cushion 30. Operate. In addition, the driving node 51 connected to the seat back 20 is located on the rear side with respect to the rotating shaft 22 mainly on the formation surface of the recliner 21 (in the radial size range) as the seat back 20 moves. Displace the close area. Furthermore, as described above, the shape of the drive node 51 is formed as a square shape in which the substantially intermediate portion is a bending point and enters the formation surface of the recliner 21. Therefore, for the reasons described above, the protective cover 60 is formed to have a size approximately the same as the size of the recliner 21 in the radial direction.

Then, the usage method of the sheet | seat 10 of a present Example is demonstrated.
First, the lock mechanism provided in the seat 10 is released, and a storing operation for tilting the seat back 20 forward is performed. Accordingly, as well shown in FIG. 2, the link mechanism 50 that connects the seat back 20 and the seat cushion 30 acts as the seat back 20 moves, and the seat cushion 30 moves forward. Descend. Specifically, the seat back 20 rotates forward with the rotation shaft 22 of the recliner 21 as the rotation center of the fixed position. Further, the seat cushion 30 is a four-joint link constituted by the front link 40 and the driven node 52 of the link mechanism 50, and the lower end side node of the front link 40 and the third node 52b of the driven node 52 are rotated to a fixed position. It turns forward as a center. As a result, as well shown in FIG. 3, the seat cushion 30 moves to the retracted position, and the seat back 20 that is brought down is superimposed on the seat cushion 30. Note that, as described above, the seat cushion 30 moves (avoids) to the front position where the swollen shape portion closer to the front side does not interfere with the seatback 20 in the middle of the depression due to the forward rotation. . As described above, the seat 10 is stored in a state in which the folded thickness of the seat back 20 and the seat cushion 30 in the stored state is effectively reduced.

  Thus, the seat 10 of the present embodiment can effectively reduce the folding thickness of the seat back 20 and the seat cushion 30 when the seat 10 is stored. In addition, the entire operation area of the link mechanism 50 serving as the connecting means can be kept within the range of the lower side of the seat cushion 30 and the radial size of the recliner 21. Therefore, the shape necessary for the protective cover 60 can be kept to a minimum so that the recliner 21 can be covered and protected. In particular, since the area closer to the front side of the recliner 21 does not become the operation area of the prime mover 51, the shape closer to the front side of the protective cover 60 can be kept smaller. Further, the lever ratio of the link mechanism 50 allows the seat cushion 30 to be moved (avoided) to a front position where the seat back 20 can be superimposed at a lower position.

  Then, the structure of the retractable seat 11 for vehicles of Example 2 of this invention is demonstrated using FIGS. 4 is a side view showing a normal posture state of the retractable seat 11 for a vehicle, FIG. 5 is a side view showing a halfway position state where the seat back 20 is tilted forward from the state of FIG. 4, and FIG. It is the side view which shows the retractable seat 11 for vehicles. In this embodiment, the same reference numerals are given to portions having the same configuration and operation as the retractable vehicle seat 11 of the first embodiment, the description thereof is omitted, and different configurations are given different reference numerals. Will be described in detail.

  The vehicle retractable seat 11 (hereinafter referred to as the seat 11) of the present embodiment, first, in the same manner as the seat 10 (see FIGS. 1 to 3) of the first embodiment, It is set as the structure which can be set as the retracted state which was sunk in the vehicle front as a state folded. That is, as well shown in FIGS. 4 to 6, the locking mechanism (not shown) provided to the seat 11 is released and the seat back 20 is tilted forward (in the arrow direction shown in FIG. 4). By doing so, the link mechanism 70 that connects the seat back 20 and the seat cushion 30 acts to lower the seat cushion 30 while moving it forward.

Specifically, as shown in FIG. 4, the link mechanism 70 is generally composed of a driving node 71 having one node connected to the seat back 20 side and a driven node having one node connected to the seat cushion 30 side. The driving node 71 and the driven node 72 are connected to each other at other nodes.
Specifically, in the driving node 71, the first node 71a on the upper end side is pin-coupled to the seat back 20 with a portion within the range of the radial size of the recliner 21 as a connecting portion 20a. More specifically, the first node 71a is disposed at a position spaced radially upward from the rotation shaft 22 of the recliner 21.
Next, the follower node 72 has a second node 72a on the upper end side pin-connected to the seat cushion 30 with a portion closer to the rear side of the seat cushion 30 as a connecting portion 30b. Further, the driven node 72 is in a state of being pin-coupled to a fixed position of the vehicle body floor F with the lower end side portion being the third node 72b. Further, the driven node 72 is pin-coupled to the fourth node 71b on the lower end side of the driving node 71 with the portion closer to the lower side as the fourth node 72c.

Therefore, the seat 11 to which the link mechanism 70 having the above-described configuration is assembled is a state in which the seat back 20 and the seat cushion 30 are folded by performing a storing operation in which the seat back 20 is tilted forward with the recliner 21 as a rotation center. As shown in FIG.
That is, when the retracting operation is performed to tilt the seat back 20 forward, the first node 71a of the driving node 71 is displaced in a direction in which the first node 71a is pushed down around the rotation shaft 22 of the recliner 21 as well shown in FIG. To do. Then, the fourth node 72c of the driven node 72 that is pin-coupled to the fourth node 71b of the driving node 71 is displaced in a direction to be pushed down corresponding to the displacement of the driving node 71. Specifically, the follower node 72 is displaced in a direction in which the fourth node 72c is pushed down around the third node 72b with the third node 72b as the rotation center. As a result, the second node 72a of the driven node 72 is also displaced in a direction in which it is pushed down around the third node 72b. Then, the seat cushion 30 is pushed forward in accordance with the displacement of the second node 72a of the driven node 72. Specifically, the seat cushion 30 is moved so as to sink forward by receiving the swinging action of the front link 40.
Here, the forward and downward movement amount of the seat cushion 30 is the pin coupling position of the driving node 71 with respect to the driven node 72 of the link mechanism 70, that is, the driven node that transmits the movement input from the driving node 71 to the seat cushion 30. 72 leverage ratio. Specifically, as shown in FIG. 5, the lever ratio is from the third node 72 b of the follower node 72 to the support point 72 to the fourth node 72 c pin-coupled to the drive node 71. It is determined as a dimensional ratio between the dimension c and the dimension d from the support point to the second node 72a pin-coupled to the connecting portion 30b of the seat cushion 30.

  Next, a protective cover 80 having a size capable of covering and protecting the operation area of the recliner 21 and the link mechanism 70 is attached to the seat 11. Here, in the link mechanism 70, the driving node 71 and the driven node 72 are connected on the lower side of the seat cushion 30, and when the movement of the seat back 20 is accompanied, the link mechanism 70 is generally on the lower side of the seat cushion 30. Operate. In addition, the driving node 71 connected to the seat back 20 is located on the front side with respect to the rotation shaft 22 mainly on the formation surface of the recliner 21 (in the radial size range) as the seat back 20 moves. Displace the close area. Therefore, for the reasons described above, the protective cover 80 is formed to have a size approximately the same as the size of the recliner 21 in the radial direction.

  In addition, since the usage method of the sheet | seat 11 of a present Example is the same as that of what was shown in Example 1, it shall be abbreviate | omitted. Therefore, also in the case of the present embodiment, as shown in FIGS. 4 to 6, the seat 11 is stored in a state in which the folded thickness of the seat back 20 and the seat cushion 30 in the stored state is effectively reduced. The

  Thus, also with the seat 11 of the present embodiment, the folding thickness of the seat back 20 and the seat cushion 30 in the retracted state of the seat 11 can be effectively reduced. In addition, the operation area of the link mechanism 70 as a whole can be kept within the range of the lower side of the seat cushion 30 and the radial size of the recliner 21. Therefore, in particular, since the region closer to the rear side of the recliner 21 does not become the operation region of the driving node 71, the shape closer to the rear side of the protective cover 80 can be kept smaller.

Although the embodiment of the present invention has been described with reference to two examples, the present invention can be implemented in various forms in addition to the above-described example.
That is, first, the shapes of the driving node 71 and the driven node 72 shown in the second embodiment are not particularly specified, but the shape of the driving node is formed as a square shape that protrudes rearward. May be. Thereby, the operation area | region of a drive node can be made to enter in the formation surface of a recliner, and also the shape of a protective cover can be kept small. Further, in the first embodiment, the shapes of the driving link 51 and the driven link 52 are shown in a square shape. However, for these shapes, depending on the setting of the lever ratio of the link mechanism, the driving link and the driven link are What is necessary is just to determine suitably as a shape which is optimally arrange | positioned.
Further, in the first and second embodiments, the description has been made on the assumption that the retracting operation in which the seat back 20 is tilted toward the front side of the seat cushion 30 is performed, but this “front” is not necessarily limited to the front of the vehicle. That is, when the entire seat is configured to be able to turn, for example, when the seat is stored in the state where the seat is directed toward the rear of the vehicle and the seat is stored toward the rear of the vehicle, the storage direction is read as “front”. It is done.

FIG. 3 is a side view illustrating a normal posture state of the retractable seat for a vehicle according to the first embodiment. FIG. 2 is a side view showing a halfway position state in which the seatback is tilted forward from the state of FIG. 1. It is a side view which shows the retractable sheet | seat for vehicles made into the retracted state. It is a side view which shows the normal attitude | position state of the retractable seat for vehicles of Example 2. FIG. FIG. 5 is a side view showing a halfway position state in which the seatback is tilted forward from the state of FIG. 4. It is a side view which shows the retractable sheet | seat for vehicles made into the retracted state. It is a side view which shows the normal posture state of the retractable seat for vehicles of a prior art. It is a side view which shows the retracted state of the retractable seat for vehicles shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10,11 Vehicle retractable seat 20 Seat back 20a Connection part 21 Recliner 22 Rotating shaft 30 Seat cushion 30a Connection part 30b Connection part 40 Front link 40a, 40b Node 50 Link mechanism 51, 71 Power node 51a, 71a Nodes 51b and 71b Fourth nodes 52 and 72 Followed nodes 52a and 72a Second nodes 52b and 72b Third nodes 52c and 72c Fourth nodes 60 and 80 Protective cover F Vehicle body floor a, b, c and d Dimensions

Claims (4)

By rotating the seat back forward and around the recliner rotation axis with respect to the vehicle body floor, the seat cushion connected to the seat back via the link mechanism is operated in conjunction so as to sink downward, A retractable seat for a vehicle that is in a retracted state in which the seat back is folded over an upper portion of the seat cushion ,
The link mechanism is configured such that a driving link rotatably connected to the seat back and a driven link rotatably connected to the seat cushion are rotatably connected to each other. A first node serving as a link connection point with the seat back is set at a position disengaged radially outward from the recliner rotation shaft, and the follower node connects the rear portion of the seat cushion to the vehicle body floor. The link is connected to the rear portion of the seat cushion, the vehicle body floor, and the driving node, so that the link movement of the driving node is caused by the forward rotation of the seat back. conjunction with be characterized in that it is adapted to link movement in the direction of sinking downward the seat cushion relative to the vehicle floor Retractable seat for a vehicle. The retractable seat for a vehicle according to claim 1,
The driven node has a distance dimension between a second node, which is a link connection point with the seat cushion, and a third node, which is a link connection point with the vehicle body floor, so that the third node and the driving force are A retractable seat for a vehicle, characterized in that it is set to be larger than a distance dimension between a fourth node that is a link connection point with a node . Claim 1 or a stowable vehicle seat according to claim 2,
The driving links are adapted to be pulled up first node is a link connection point between the seat back by rotating falling forward the seat back around the rotation axis of the recliner, the follower is A position between a third node, which is a link connection point with the vehicle body floor, and a fourth node, which is a link connection point between the driving node and the second node, which is a link connection point with the seat cushion. A retractable seat for a vehicle, wherein Claim 1 or a stowable vehicle seat according to claim 2,
The driving links is adapted to the first node is a link connection point between the seat back is pushed down by rotating falling forward the seat back around the rotation axis of the recliner, the follower is A position between a second node that is a link connection point with the seat cushion and a third node that is a link connection point with the vehicle body floor is a fourth node that is a link connection point with the driving node A retractable seat for a vehicle, wherein

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