JP2020011588A - Vehicle seat - Google Patents

Abstract

To inhibit rattling of a seat cushion with a simple structure and support the seat cushion properly.SOLUTION: A vehicle seat S includes: a seat back 1; a seat cushion 2 which is supported so as to be rotatable relative to the seat back 1; a base cover 60 which supports a lower surface of the seat cushion 2 when the vehicle seat S is in a seating state where a seating person can be seated on the seat cushion 2; and a torsion spring 110 which biases the seat cushion 2 in a direction such that the lower surface of the seat cushion 2 contacts with the base cover 60.SELECTED DRAWING: Figure 9

Description

  The present invention relates to a vehicle seat, and more particularly, to a seating state in which a seat back can stand on a vehicle body floor and a seat cushion can be seated by a seat cushion, and a seat back can stand on a vehicle body floor. On the other hand, the present invention relates to a vehicle seat capable of switching a state between a tip-up state in which a seat cushion jumps up toward a seat back.

  Vehicle seats capable of switching between a seated state, a tip-up state, and a stored state are already known. 2. Description of the Related Art A vehicle seat (a so-called chip-up seat) that stores a seat cushion by flipping up a seat cushion (chip-up) and matching a seat back with a seating surface is known. Also known is a vehicle seat (so-called dive-down seat) in which the seat back falls down and falls down (dive down) together with the seat cushion and is stored with the seat cushion and seating surface together. I have.

  For example, in a vehicle seat disclosed in Patent Document 1, a seat cushion is supported rotatably with respect to a seat back by a pin serving as a rotation axis, and a lower surface of the seat cushion extends in a seat width direction. It is described that it is supported by a part.

  In the tip-up seat of Patent Document 2, a seat cushion is rotatably supported by a pin with respect to a seat back, and a lock provided with notched teeth for locking the seated state and the tip-up state. The mechanism is described.

JP-A-2006-107881 JP-A-2006-155419

  In the vehicle seat of Patent Literature 1, there is a possibility that the seat cushion rattles due to vibration or the like input from the vehicle body. Therefore, it is required to suppress rattling of the seat cushion with a simple structure.

  The tip-up seat of Patent Document 2 has a structure in which the seat load on the seat cushion is received only at the notch teeth, so that when securing the rigidity to properly support the seat cushion, the surroundings of the lock mechanism are required. The structure becomes large. Therefore, it is required to appropriately support the seat cushion with a simple structure.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a vehicle seat capable of suppressing rattling of a seat cushion with a simple structure and appropriately supporting the seat cushion. It is in.

  The object is to provide a vehicle seat according to the present invention, which is a vehicle seat, wherein the seat back, a seat cushion rotatably supported with respect to the seat back, and the vehicle seat include the seat. A support member that supports the lower surface of the seat cushion when the seat is in a seated state where a seated person can be seated on the cushion, and biases the seat cushion in a direction in which the lower surface of the seat cushion comes into contact with the support member. And a biasing member that performs the operation.

  In the vehicle seat of the present invention configured as described above, when the seat is in the seated state, the lower surface of the seat cushion is urged by the urging member in a direction in which the lower surface of the seat cushion comes into contact with the support member. Is pressed against the support member, so that rattling of the seat cushion can be suppressed with a simple structure, and the seat cushion can be appropriately supported.

In the above-mentioned vehicle seat, the vehicle seat is provided with an urging force reducing device that is capable of switching to a tip-up state in which the seat cushion jumps up toward the seat back and reduces the urging force of the urging member. The urging force reducing device may reduce the urging force for urging the lower surface of the seat cushion in a direction in which the lower surface of the seat cushion comes into contact with the support member when the seat cushion shifts from the seated state to the tip-up state.
In the above configuration, when the seat state is shifted from the sitting state to the tip-up state, the urging force of the urging member on the seat cushion is reduced, and the operation load is reduced, so that the operability is improved.

In the above vehicle seat, the urging force reducing device includes a bracket for attaching the urging member to the vehicle seat, and one end of the urging member is fixed to the bracket or the seat back. In the seated state, the other end of the urging member urges the lower surface of the seat cushion in a direction in which the lower surface of the seat cushion comes into contact with the support member, and the seat cushion is moved from the seated state to the tip-up state. When shifting, the urging force reducing device may act on the other end of the urging member to reduce the urging force.
In the above configuration, the urging force can be reduced with a simple configuration.

In the above vehicle seat, the bracket includes a first bracket attached to the seat back, and a second bracket attached to the seat cushion, wherein the first bracket is provided in addition to the urging member. A second bracket having an urging member supporting portion for supporting the other end of the urging member, wherein the seat cushion shifts from the seated state to the tip-up state; In this case, the urging force may be reduced by causing the urging member supporting portion to contact the other end of the urging member with the groove.
In the above configuration, when the seat cushion shifts from the sitting state to the tip-up state, the urging member supporting portion of the second bracket attached to the seat cushion has the other end of the urging member attached to the seat back. By making contact with the groove of the first bracket, the urging force can be appropriately reduced.

In the above-described vehicle seat, the groove portion includes an inclined portion inclined inward in the width direction of the vehicle seat, and a regulating portion provided inside the inclined portion in the width direction of the vehicle seat. When the seat cushion shifts from the seated state to the tip-up state, the other end of the urging member abuts on the inclined portion, so that the urging force is reduced. It is preferable that the urging force is kept constant by restricting the movement of the end by the restricting portion.
In the above configuration, when the seat cushion shifts from the seated state to the tip-up state, the other end of the urging member contacts the inclined portion to reduce the urging force, and the other end of the urging member is Since the urging force is held constant by being locked to the restricting portion, the urging force can be appropriately reduced with a simple configuration.

In the vehicle seat described above, the vehicle seat includes a locking device that locks the seat cushion in the tip-up state, the seat cushion includes a first connecting member extending in a front-rear direction of the vehicle seat, and The seat device is rotatably supported with respect to the seat back via a second connecting member, the lock device is provided on the first connecting member, and the urging member is attached to the second connecting member. It should be provided.
In the above configuration, the urging member and the locking device for the seat cushion can be arranged separately in the seat width direction into the first connecting member and the second connecting member, so that the seat structure can be made compact.

In the above vehicle seat, the seat cushion may be supported rotatably with respect to the seat back on a rotation axis, and the urging member may be attached around the rotation axis. .
In the above configuration, since the urging member is attached around the rotation shaft that rotatably supports the seat cushion with respect to the seat back, the seat cushion can be appropriately urged with a simple configuration. Becomes

According to the vehicle seat of the present invention, when the seat is in the seating state, the lower surface of the seat cushion is urged by the urging member in a direction in which the lower surface of the seat cushion comes into contact with the support member, and the seat cushion is moved relative to the support member. As a result, it is possible to suppress rattling of the seat cushion with a simple structure and appropriately support the seat cushion.
Further, according to the vehicle seat of the present invention, when shifting the seat state from the sitting state to the tip-up state, the urging force of the urging member against the seat cushion is reduced, and the operation load is reduced. The performance is improved.
Further, according to the vehicle seat of the present invention, the urging force can be reduced with a simple configuration.
According to the vehicle seat of the present invention, when the seat cushion shifts from the seated state to the tip-up state, the urging member supporting portion of the second bracket attached to the seat cushion is connected to the other end of the urging member. The urging force can be appropriately reduced by bringing the portion into contact with the groove of the first bracket attached to the seat back.
Further, according to the vehicle seat of the present invention, when the seat cushion shifts from the sitting state to the tip-up state, the other end of the urging member abuts on the inclined portion to reduce the urging force, and Since the urging force is kept constant by locking the other end of the urging member to the regulating portion, the urging force can be appropriately reduced with a simple configuration.
Further, according to the vehicle seat of the present invention, the urging member and the locking device for the seat cushion can be arranged separately in the seat width direction into the first connecting member and the second connecting member, so that the seat structure is downsized. It becomes possible.
Further, according to the vehicle seat of the present invention, since the urging member is mounted around the rotation shaft that rotatably supports the seat cushion with respect to the seat back, the seat cushion can be appropriately formed with a simple configuration. Can be energized.

1 is a perspective view of a vehicle seat according to one embodiment of the present invention. It is a side view of a vehicle seat when a seat state is a seating state. FIG. 4 is a side view of the vehicle seat when the seat state is a stored state. It is a side view of a vehicle seat when a seat state is a tip-up state. It is a perspective view of a vehicle seat when a seat state is a tip-up state. It is a perspective view of the seat frame which the vehicle seat concerning one embodiment of the present invention has. It is a figure showing the cushion lock device with which the vehicle seat concerning one embodiment of the present invention is provided. It is a figure which shows the lower part of the seat frame which a vehicle seat has, and its peripheral equipment. BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the urging force reduction apparatus with which the vehicle seat which concerns on one Embodiment of this invention is provided. It is a figure showing the back of an urging force reduction device. It is an exploded view of an urging force reducing device. FIG. 4 is a diagram illustrating the urging force reducing device when the seat state is a seating state. It is a figure which shows the urging force reduction device when a seat state changes to a tip-up state from a sitting state. FIG. 4 is a diagram illustrating the urging force reducing device when a sheet state is a tip-up state.

Hereinafter, a configuration of a vehicle seat according to an embodiment of the present invention will be described with reference to the drawings. However, the embodiments described below are intended to facilitate understanding of the present invention, and do not limit the present invention. That is, the present invention can be changed and improved without departing from the spirit thereof, and the present invention naturally includes equivalents thereof.
Further, in the following description, the contents relating to the material, shape and size of the seat component are merely one of specific examples, and do not limit the present invention.

  Hereinafter, a vehicle seat mounted on a vehicle will be described as an example of a vehicle seat, and a configuration example thereof will be described. However, the present invention is not limited to vehicle seats mounted on vehicles such as automobiles and railroads that have wheels, for example, seats mounted on aircraft or ships that move other than on the ground. Can be applied.

  In the following description, the “front-rear direction” is the front-rear direction of the vehicle seat (in other words, the front-rear direction of the seat body), and is the direction that matches the traveling direction of the vehicle when traveling. The “seat width direction” is the width direction of the vehicle seat (in other words, the width direction of the seat body), and is a direction that coincides with the left-right direction viewed from the occupant sitting on the vehicle seat. The “vertical direction” is the vertical direction of the vehicle seat, and is the direction that coincides with the vertical direction when the vehicle is traveling on a horizontal plane.

Further, “outside the vehicle” in the seat width direction means a side closer to the outside of the vehicle body (for simplicity, the side closer to the nearest door), and “inside the vehicle” means a side closer to the inside of the vehicle body (understandably). Easily means the side away from the nearest door).
In the following description, “rotation” means a rotation operation about an axis along the sheet width direction unless otherwise specified.

  The shape, position, posture, and the like of each part of the seat described below will be described on the assumption that the vehicle seat is in a seated state described later, unless otherwise specified.

<Basic configuration of vehicle seat according to this embodiment>
The basic configuration of the vehicle seat (hereinafter, vehicle seat S) according to the present embodiment will be described with reference to FIG. FIG. 1 is a perspective view of the vehicle seat S.

  The vehicle seat S is a seat that is placed on a vehicle body floor and on which a vehicle occupant sits. In the present embodiment, the vehicle seat S is used as a rear seat corresponding to a rear seat of the vehicle. However, the present invention is not limited to this, and the vehicle seat S can also be used as a second-row middle seat or a third-row rear seat in a vehicle having three rows of seats in the front-rear direction.

  As shown in FIG. 1, the vehicle seat S has a seat body Sh that forms a main body thereof. The seat body Sh includes a seat back 1, a seat cushion 2, and a headrest 3, as shown in FIG. The seat back 1 is rotatably attached to a vehicle body floor via a support base 40 described later.

  The seat cushion 2 has a rear end connected to a lower end of the seat back 1. A connecting member 5 is interposed between the rear end of the seat cushion 2 and the lower end of the seat back 1 as shown in FIG. The connecting member 5 is attached to the seat back 1 so as to be rotatable. Thereby, the seat cushion 2 can rotate with respect to the seat back 1 together with the connecting member 5.

  Further, a slide rail mechanism 4 described below is installed below the seat body Sh. By the slide rail mechanism 4, the seat body Sh is mounted on the vehicle body floor in a state of being slidable in the front-rear direction.

  The seat body Sh can be stored in a folded state on a storage floor F formed in front thereof. The storage floor F is formed by recessing a part of the vehicle body floor (specifically, a part located in front of the seat body Sh when the seat body Sh is in the seated state in the body floor). It is a concave space.

<Regarding changes in the state of the seat body>
In the present embodiment, the state of the seat body Sh (hereinafter, the sheet state) can be changed. Hereinafter, changes in the seat state will be described with reference to FIGS. 2 to 5. 2 to 4 are side views of the vehicle seat S, FIG. 2 is a view when the seat state is a seated state, FIG. 3 is a view when the seat state is a stored state, and FIG. FIG. 11 is a diagram when the sheet state is a chip-up state. FIG. 5 is a perspective view of the vehicle seat S when the seat state is the tip-up state.

  In the present embodiment, the seat state can be switched between a seated state shown in FIG. 2, a stored state shown in FIG. 3, and a tip-up state shown in FIGS.

(Seated state)
The seating state illustrated in FIG. 2 is a state in which the seat back 1 stands up on the vehicle body floor and the occupant, who is a seated person, can be seated on the seat cushion 2. When the seat is in a seatable state, as shown in FIGS. 1 and 2, the seatback 1 is slightly inclined backward, and the seat cushion 2 has a seating surface (an occupant's buttocks and thighs). (The surface on which it rests) faces upward.

(Storage state)
The storage state illustrated in FIG. 3 is a state where the sheet main body Sh is stored in the storage floor F in a folded state. When the seat body Sh shifts to the stowed state, the seat back 1 falls forward with respect to the vehicle body floor, and the seat cushion 2 rotates in a direction approaching the seat back 1. Then, when the seat state is the storage state, as shown in FIG. 3, the rear surface (back surface) of the seat back 1 has the same height (level) as the periphery of the storage floor F in the vehicle body floor, and the seat cushion 2 becomes the seat back. 1 and the vehicle body floor.

(Chip up state)
The tip-up state is a state in which the seat back 1 stands up with respect to the vehicle body floor while the seat cushion 2 jumps up toward the seat back 1 as shown in FIGS.

  Further, the vehicle seat S according to the present embodiment is provided with a lock device for locking the seat state in a tip-up state. The vehicle seat S according to the present embodiment includes a cushion lock device 25 that locks the seat cushion 2 when the seat is in a seating state and a tip-up state, as described later.

  Next, the movement of each part of the seat body Sh when switching the seat state will be roughly described. When the seat is in a seated state, the seat back 1 is in an upright posture with respect to the vehicle body floor, and the seat cushion 2 is in a substantially horizontal posture with respect to the vehicle body floor. When the seat is in the seated state, the seat cushion 2 is held by the cushion lock device 25 in a seatable state. Here, when the reclining operation lever (not shown) is operated, the lock of the reclining device 13 is released, and at the same time, the lock of the cushion lock device 25 is also released by the cable (not shown) (the first engaging hole of the lock piece 28). The engagement with the seat back 2 is released, and the seat back 1 can be rotated and the relative rotation of the seat cushion 2 with respect to the seat back 1 can be allowed. By rotating the seat back 1 within a predetermined range with the cushion lock device 25 unlocked, the occupant can adjust the position of the seat back 1 to a desired position.

  When switching the seat state from the seated state (FIG. 2) to the stowable state (FIG. 3), first, as described above, the lock of the cushion lock device 25 is released, so that the seat back 1 is moved from an urging member (not shown). It rotates with respect to the vehicle body floor so as to fall forward by the urging force. In addition, the seat cushion 2 rotates forward with the connecting member 5 in a direction approaching the seat back 1 while moving forward with the forward tilting operation of the seat back 1. At this time, the lower surface of the connecting member 5 of the seat body Sh slides on a predetermined portion of the base cover 60 disposed below the seat body Sh. As a result, the seat cushion 2 smoothly moves forward, and eventually enters the storage floor F.

  Thereafter, the seat back 1 enters the storage floor F by the further forward tilting operation of the seat back 1, and the seat cushion 2 moves forward along the bottom surface of the storage floor F. Finally, when the seat back 1 is folded on the seat cushion 2 in the storage floor F, the seat state reaches the storage state (FIG. 3).

  When switching the seat state from the stored state (FIG. 3) to the tip-up state, the occupant manually raises the seat body Sh stored on the storage floor F upward. At this time, the seat cushion 2 is in a posture folded with respect to the seat back 1 (that is, a posture in which the seat cushion 2 jumps up with respect to the seat back 1). Therefore, by raising the seat body Sh until the seat back 1 reaches the standing position (that is, the position of the seat back 1 when the seat is in the seated state), the seat state is switched to the tip-up state (FIG. 4). become. When the seat state is switched to the tip-up state, the seat back 1 is locked in an upright posture with respect to the vehicle body floor.

  When switching the seat state from the tip-up state to the sitting state, the occupant performs an operation for releasing the lock of the seat cushion 2. In the present embodiment, the lock of the seat cushion 2 is released by operating the damper 26 shown in FIG. 5 provided on the back surface of the seat cushion 2. When the lock is released, the seat cushion 2 rotates together with the connecting member 5 in a direction away from the seat back 1 by an urging force from an urging member (not shown). Then, when the seat cushion 2 reaches the seatable position (that is, the position of the seat cushion 2 when the seat state is the seated state), the seat state is switched to the seatable position.

<Configuration of each part of the seat>
Hereinafter, the configuration of each part of the vehicle seat S will be described with reference to FIGS. 6 to 8 together with the above-described FIGS. 1 to 5. FIG. 6 is a perspective view of a seat frame forming a skeleton of the vehicle seat S. FIG. 7 is a diagram showing a cushion lock device. FIG. 8 is a diagram illustrating a lower portion of a seat frame forming a skeleton of the vehicle seat S and peripheral devices thereof.

  The vehicle seat S includes a seat body Sh, as shown in FIG. 1 and the like. The seat body Sh includes a seat back 1 and a seat cushion 2. Each of the seat back 1 and the seat cushion 2 includes a frame illustrated in FIG. 6 (specifically, the seat back frame 10 and the seat cushion frame 20).

  The seat back 1 and the seat cushion 2 are connected by a connecting member 5. The connecting member 5 is a substantially L-shaped member as viewed from the side, and extends in the seat front-rear direction. The connecting member 5 also has a function as a side frame of the seat cushion 2. The connecting member 5 is formed by processing a metal plate, and connects the seat back frame 10 and the seat cushion frame 20 at an end of the seat body Sh in the seat width direction. The rear end of the connecting member 5 is rotatably attached to the seat back frame 10. That is, the seat cushion 2 rotates together with the connecting member 5 with respect to the seat back 1 as the rear end of the connecting member 5 rotates with respect to the seat back frame 10.

  A cushion lock device 25 as a lock device is attached to the rear end of the connecting member 5. The cushion lock device 25 is disposed at a position sandwiched between the connecting member 5 and a side end of the seat back frame 10 in the seat width direction. The cushion lock device 25 locks the seat cushion 2 at the current position when the seat is in the seated state. Further, when the seat state is the tip-up state, the cushion lock device 25 locks the seat cushion 2 at the position at that time. As described in detail below, the cushion lock device 25 can switch its state between a locked state and an unlocked state.

  The configuration of the seat body Sh will be described in more detail. As shown in FIG. 5, a damper 26 is provided on the back surface of the seat cushion 2 of this embodiment (the lower surface of the seat cushion 2 when the seat is in a seated state). Have been. The damper 26 is a convex protrusion protruding downward from the back surface of the seat cushion 2 (the side opposite to the side where the seating surface is located in the thickness direction of the seat cushion 2). The damper 26 has an oval shape when viewed from the front, and protrudes from the central portion in the seat width direction of the front end region on the back surface of the seat cushion 2 as shown in FIG.

  Further, when the seat is in the housed state, the damper 26 abuts on the vehicle body floor at its tip (lower end). Thus, it is possible to prevent the rear surface of the seat cushion 2 from coming into contact with the vehicle body floor and being stained while the seat is in the housed state.

  The damper 26 is operated when switching the seat state from the tip-up state to the sitting state. More specifically, a slit 2a extending from the center of the seat cushion 2 toward the outside of the vehicle along the width direction of the seat is provided in the front end region of the back surface of the seat cushion 2. In the present embodiment, the damper 26 can slide within the slit 2a along the sheet width direction. The damper 26 is connected to the cushion lock device 25 via a cable (not shown).

  More specifically, as shown in FIG. 7, the damper 26 is connected to the cushion lock device 25 via a cable 27. In this configuration, of the cushion lock device 25, the lock piece 28 attached to the connecting member 5 is engaged with the engagement hole (specifically, the first engagement hole 29 a and the first engagement hole 29 a) of the engagement member 29 attached to the seat back 1. 2), the seat cushion 2 is locked at the position at that time. When the seat is in the seated state, the lock piece 28 is engaged with the first engagement hole 29a. When the seat is in the tip-up state, the lock piece 28 is engaged with the second engagement hole 29b. Have been combined.

  More specifically, when the seat state is the tip-up state, the damper 26 is moved to one end position of the sliding movement range (specifically, the center portion of the seat cushion 2 in the seat width direction in the formation range of the slit 2a). (A position corresponding to), the lock piece 28 is engaged with the second engagement hole 29b, the seat cushion 2 is locked, and the seat state is locked in the tip-up state.

  Further, when the seat state is the tip-up state, the occupant moves the damper 26 to the other end position of the sliding range (specifically, the end position of the slit 2a forming area located outside the vehicle in the seat width direction). , The cable 27 connected to the damper 26 is pulled, and the cushion lock device 25 performs an unlocking operation. As a result, as a result, the lock piece 28 comes off from the engagement hole, and the lock in the seat state (strictly, the lock of the seat cushion 2) is released.

  The components operated to release the lock of the seat cushion 2 are not limited to the damper 26. However, if the damper 26 is used as an operation component for unlocking, the seat state can be changed to the seating state or the seat state. The vehicle seat S configured to lock or unlock in the tip-up state can be configured with a smaller number of components.

  The vehicle seat S has a buckle 6 for wearing a seat belt as a peripheral device of the seat body Sh. As shown in FIGS. 1 and 6, the buckle 6 is arranged at a side position of the seat body Sh, and more specifically, at a position adjacent to the seat body Sh inside the vehicle in the seat width direction. In the present embodiment, the buckle 6 has a support bracket 6a for supporting a main body portion (a portion to be connected to the tongue of the seat belt), and the support bracket 6a is provided so as to be rotatable with respect to the vehicle body floor. Have been. That is, the buckle 6 of the present embodiment is configured to be able to lean forward with respect to the vehicle body floor by rotating the support bracket 6a. When the seat state shifts to the stowed state, the buckle 6 is pushed from behind by the side end of the seat back 1 and falls forward with the seat back 1.

  The vehicle seat S has a slide rail mechanism 4 shown in FIGS. 6 and 8 as peripheral devices of the seat body Sh. The slide rail mechanism 4 is a device for slidingly moving the seat body Sh in the front-rear direction, and has a known structure (structure of a general slide rail mechanism). That is, the slide rail mechanism 4 includes a pair of a lower rail 4a fixed on the vehicle body floor and an upper rail 4b slidable with respect to the lower rail 4a. The seat body Sh is attached to the upper rail 4b, and moves back and forth with the sliding movement of the upper rail 4b.

  The upper rail 4b is normally locked so as not to be slidable, and is unlocked and slidable when the occupant performs a predetermined operation. More specifically, in the present embodiment, the operation strap 7 shown in FIG. 1 is provided as an operation member operated to release the lock of the upper rail 4b. The operation strap 7 is a belt-like member formed in an endless shape, and is located below the seat cushion 2 when the seat is in a seated state, as shown in FIG. In the present embodiment, the operation strap 7 is provided at the outer end of the vehicle seat S in the width direction of the vehicle. Accordingly, it is possible to release the lock of the upper rail 4b by operating the operation strap 7 from the outside of the vehicle with the door opened.

  The operation strap 7 is connected to a slide lock mechanism via a cable (not shown). Regarding the slide lock mechanism, a general device for locking the upper rail 4b can be used, so that the description and illustration are omitted. When the operation strap 7 is pulled forward, the cable is pulled, so that the slide lock mechanism operates to release the lock of the upper rail 4b.

(Support base 40)
The vehicle seat S has a support base 40 shown in FIGS. 6 and 8. The support base 40 is disposed immediately above the slide rail mechanism 4 and supports the seat body Sh (the seat back 1 and the seat cushion 2). The support base 40 includes a pair of left and right base brackets (a first base bracket 41 and a second base bracket 42) provided at positions separated from each other in the seat width direction, and a first base bracket 41 and a second base bracket 42. A front connecting member 43 connects the front portions to each other, and a rear connecting member 44 connects the front and rear portions of the first base bracket 41 and the second base bracket 42 to each other in the front-rear direction.

  The first base bracket 41 and the second base bracket 42 are sheet metal members extending long in the front-rear direction, and include flanges 41a and 42a extending inward in the sheet width direction. The first base bracket 41 is bolted to the upper surface of the upper rail 4b at the flange 41a, and the second base bracket 42 is bolted to the upper surface of the upper rail 4b at the flange 42a. Therefore, when the upper rail 4b slides, the support base 40 including the base brackets 41 and 42 moves back and forth integrally with the upper rail 4b.

  Further, the first base bracket 41 includes a top portion 41b in which a side wall of the first base bracket 41 is protruded in a mountain shape at a center portion in the front-rear direction, and the second base bracket 42 is provided at a center portion in the front-rear direction. The side wall of the second base bracket 42 is provided with a top portion 42b that protrudes in a mountain shape. The lower ends of the first connection link 11a and the second connection link 11b are rotatably attached to the top 41b of the first base bracket 41 and the top 42b of the second base bracket 42, respectively.

  The connection link 11 is a link member bent in a substantially arcuate shape, and is provided between the lower end of the seat back frame 10 and the first base bracket 41 and between the lower end of the seat back frame 10 and the second base bracket 42. Each is interposed. That is, the seat body Sh (strictly, the seat back 1) is fixed to the upper rail 4 b of the slide rail mechanism 4 via the connection link 11 and the support base 40.

  Further, one (two in total) connecting links 11 are provided at both ends in the sheet width direction of the sheet body Sh. The lower end of the first connecting link 11a is rotatably supported by the top 41b at the center in the front-rear direction of the first base bracket 41 located on the same side as the first connecting link 11a in the seat width direction. I have. The lower end of the second connecting link 11b is rotatably supported by the top 42b at the center in the front-rear direction of the second base bracket 42 located on the same side as the second connecting link 11b in the seat width direction. I have. As a result, the connection links 11 (the first connection link 11a and the second connection link 11b) rotate forward with respect to the first base bracket 41 and the second base bracket 42 of the support base 40. Accordingly, the seat back 1 falls forward.

  The reclining device 13 is attached to the lower end of the first connection link 11a on the first base bracket 41 side. The reclining device 13 is disposed between the first connection link 11a and the first base bracket 41 in the seat width direction. The reclining device 13 has a known structure (a structure of a general reclining device), and its state can be switched between a locked state and an unlocked state. When the reclining device 13 is in the locked state, the first connection link 11a is in a non-rotatable state, so that the seat back 1 is locked in the posture at that time. On the other hand, when the reclining device 13 is in the unlocked state, the first connecting link 11a is in a rotatable state with respect to the first base bracket 41, and as a result, the seat back 1 can be freely rotated. .

(Connecting member)
As shown in FIGS. 6 and 8, a pair of slide rails of the slide rail mechanism 4 are connected by a front connection member 43. The front connecting member 43 has two bent portions 43c between a first end 43a (one end) and a second end 43b (other end). Further, as shown in FIG. 8, between the two bent portions 43c, the front connecting member 43 is bent so as to protrude forward.

  As described above, the front connecting member 43 has the bent portion 43c as a reinforcing portion between the first end 43a and the second end 43b, and has improved rigidity. Part) can be stably supported.

(Base cover 60)
The base cover 60 is a resin molded product that covers the entire support base 40 and the slide rail mechanism 4 from above. In the present embodiment, the base cover 60 has a function of guiding the movement of the seat cushion 2 when switching the seat state, in addition to a function of covering the support base 40 and the slide rail mechanism 4. Further, as described later, the base cover 60 includes a luggage accommodation recess 65 for accommodating an article such as luggage, and corresponds to the accommodation section in the present embodiment.

  The base cover 60 has the outer shape shown in FIG. 5, and is placed on the vehicle body floor. The base cover 60 swells upward as a whole, and has a space inside the base cover 60 sufficient to accommodate the support base 40 and the slide rail mechanism 4. In addition, the base cover 60 of the present embodiment is divided into two right and left parts, and is configured by combining two pieces (piece-shaped pieces constituting the base cover 60). However, the present invention is not limited to this, and the base cover 60 may be composed of only one component (one piece).

  As shown in FIG. 5, a first raised portion 61 and a second raised portion 62 which are raised upward from other portions are formed at both ends in the sheet width direction of the base cover 60. The first raised portion 61 has a top portion 61 a at a position corresponding to the top portion 41 b of the first base bracket 41, and the second raised portion 62 has a top portion at a position corresponding to the top portion 42 b of the second base bracket 42. 62a. The second raised portion 62 constitutes a guide portion, and is provided so as to extend from the front end to the rear end of the base cover 60 along the front-rear direction. At both ends in the front-rear direction of the base cover 60, a front protruding portion 63 and a rear protruding portion 64 protruding upward from other portions are formed.

  As shown in FIGS. 2 to 5, the second raised portion 62 has a substantially mountain shape when viewed from the side, and its upper end surface is a plane curved so as to form an arc protruding upward. . The front end surface of the second raised portion 62 is an inclined surface as shown in FIGS. 2 to 5, and the storage floor F is arranged on an extension of the inclined surface. Further, the first raised portion 61 and the second raised portion 62 have a slight spread (lateral width) in the sheet width direction.

  The second raised portion 62 configured as described above guides the movement of the seat back 1 and the seat cushion 2 by slidingly contacting a part of the seat body Sh when the seat state shifts to the storage state. More specifically, when the seat state shifts to the storage state, if the seat back 1 falls forward, the seat cushion 2 moves forward toward the storage floor F with this. At this time, the lower surface of the connecting member 5 slides (specifically, slides) on the front end surface of the second raised portion 62 inclined toward the storage floor F. Thereby, the seat cushion 2 is guided by the second raised portion 62 and smoothly moves to the storage floor F.

  Further, a portion of the base cover 60 that is located between the first raised portion 61 and the second raised portion 62 in the sheet width direction and located between the front protruding portion 63 and the rear protruding portion 64 in the front-rear direction. As shown in FIG. 5, the first protrusion 61 and the second protrusion 62 are recessed (recessed) to form a recessed space. This space constitutes a luggage accommodation recess 65. Thus, for example, while the seat is in the seated state or the tip-up state, the luggage having a slight height is placed in the space (in the luggage receiving recess 65) located below the seat cushion 2. It is possible. The front connecting member 43 has a bent portion 43c bent so as to protrude to the front side of the vehicle seat S, has improved rigidity, and has a simple configuration and can serve as a luggage accommodating area. The accommodation recess 65 is enlarged.

<Biasing force reduction device 100>
As will be described in detail below, the vehicle seat S according to the present embodiment is configured to bias the seat cushion 2 in a direction in which the lower surface of the seat cushion 2 comes into contact with the support member when the seat is in a seated state. A torsion spring 110 is provided as a biasing member.

  Here, in a vehicle seat capable of shifting to the tip-up state, when the seat state is shifted from the sitting state to the tip-up state by flipping up the seat cushion 2, an urging member (for example, the torsion spring 110) is used. When the seat cushion 2 is flipped up while the urging force is being applied by ()), the urging member is wound and narrowed, and the force for pressing the seat cushion 2 is increased. That is, the operation load when shifting the seat cushion 2 to the tip-up state increases, and the operability decreases. Further, when the seat cushion 2 is shifted to the seated state, there is a possibility that the seat cushion 2 may move vigorously downward.

  Therefore, the vehicle seat S according to the present embodiment stops the winding of the urging member (torsion spring 110) by shifting the seat state from the seated state to the tip-up state by flipping up the seat cushion 2. And an urging force reducing device 100 for suppressing an urging force for pressing the seat cushion 2 from increasing.

  Hereinafter, the urging force reducing device 100 according to the present embodiment will be described with reference to FIGS. 9 to 14. The urging force reducing device 100 includes a torsion spring 110 as an urging member, a back rotation bracket 120 attached to the seat back frame 10, and a connecting member that rotatably connects the seat cushion 2 to the seat back 1. 5 as a main component.

(Torsion spring 110)
The torsion spring 110 as a biasing member includes a first end 111 that is one end and a second end 112 that is the other end. The first end 111 is arranged behind the seat, and the second end 112 is arranged ahead of the seat. The first end 111 and the second end 112 are bent. The torsion spring 110 is an urging member that urges the seat cushion 2 in a direction in which the lower surface of the seat cushion 2 comes into contact with the support member when the seat is in a seated state. Here, the support member in the vehicle seat S according to the present embodiment is a base cover 60 (specifically, a first raised portion 61 and a second raised portion 62, and more specifically, the first raised portion 61. And the support base 40 (specifically, the first base bracket 41 and the second base bracket 42, and more specifically, the top of the first base bracket 41). 41b, the top portion 42b) of the second base bracket 42, and the slide rail mechanism 4.

(Back rotation bracket 120)
As shown in FIGS. 9 to 11, the back rotation bracket 120 includes a side surface 121 having an opening 121a provided in the seat width direction, a rear surface 122 on the rear side of the seat, and an upper surface 123 connecting the side surface 121 and the rear surface 122. And a locking piece 124 to which the second end 112 of the torsion spring 110 is locked. The back rotation bracket 120 corresponds to a first bracket in the present embodiment.

  Here, as shown in FIG. 10, a rear surface adjustment groove 122 a for adjusting the urging force of the torsion spring 110 is formed in the rear surface 122 of the back rotation bracket 120. The first end 111 of the torsion spring 110 is hooked and fixed to the rear adjustment groove 122a. The rear surface adjustment groove 122a has two concave portions separated in the seat vertical direction, and the urging force of the torsion spring 110 is changed by changing the position of the concave portion that locks the first end 111 of the torsion spring 110. Can be adjusted.

  The back rotation bracket 120 includes a locking piece 124 extending inward in the seat width direction. As shown in FIG. 9, an urging force adjusting groove 125 for reducing the urging force of the torsion spring 110 when the seat cushion 2 shifts from the seated state to the tip-up state is formed in the locking piece 124. I have. The biasing force adjusting groove 125 includes an inlet 125 a serving as an entrance of the second end 112 of the torsion spring 110, an inclined portion 125 b continuous from the inlet 125 a, and provided inward in the sheet width direction, and a seat 125 a. A regulating portion 125c provided inside the inclined portion 125b in the width direction.

(Cushion rotation bracket 130)
As shown in FIGS. 9 to 11, the cushion rotation bracket 130 includes a side surface 131 having an opening 131 a provided in the seat width direction, a spring support portion 132 that supports the second end 112 of the torsion spring 110, An attachment portion 133 attached to the connecting member 5 that rotatably connects the seat cushion 2 to the seat back 1. Note that the cushion rotation bracket 130 corresponds to the second bracket in the present embodiment.

  When the seat cushion 2 shifts from the seated state to the tip-up state, the spring support 132 of the cushion rotation bracket 130 adjusts the biasing force of the locking piece 124 while supporting the second end 112 of the torsion spring 110. It is brought into contact with the groove 125. Since the cushion rotation bracket 130 is attached to the connection member 5 at the attachment portion 133, the rotation operations of the cushion rotation bracket 130 and the connection member 5 are linked. Specifically, when the seat cushion 2 provided with the connecting member 5 is rotated in a lifting direction, the cushion rotation bracket 130 also rotates in the same direction. Further, when an urging force is applied to rotate the cushion rotation bracket 130 downward, the seat cushion 2 also moves in the same direction (downward, in other words, the lower surface of the seat cushion 2) as a support member via the connecting member 5. (In the direction of contact with the base cover 60).

  As shown in an exploded view of the urging force reducing device 100 in FIG. 11, a shaft 140 and a cylindrical member 141 are inserted into the torsion spring 110, and the bushing 142, 143 is interposed therebetween, and the back rotation bracket 120, Combined with the cushion rotation bracket 130. The dashed line in FIG. 11 is the axis of the connecting member 5, the torsion spring 110, the opening 121a of the back rotation bracket 120, the opening 131a of the cushion rotation bracket 130, the shaft 140, and the cylindrical member 141 (more in detail). Is a rotation axis of the connecting member 5, the torsion spring 110, the cushion rotation bracket 130, the shaft 140, and the tubular member 141).

<Operation of the urging force reducing device 100>
(Seated state)
When the seat state is the sitting state (FIG. 2), the urging force reduction device 100 is in the state shown in FIG. In the state shown in FIG. 12, the spring support 132 of the cushion rotation bracket 130 is pushed downward by the second end 112 of the torsion spring 110, so that the lower surface of the seat cushion 2 is An urging force (pressing force) that urges the cover 60 in a direction in which it contacts the first ridge 61 and the second ridge 62 (more specifically, the top 61a of the first ridge 61 and the top 62a of the second ridge 62). Force) is occurring.

  Therefore, when the seat is in the seating state (FIG. 2), the lower surface of the seat cushion 2 is pressed and supported by the torsion spring 110 against the base cover 60 constituting the support member. It is possible to suppress.

(During transition from the seated state to the tip-up state)
While the seat state shifts from the sitting state (FIG. 2) to the tip-up state (FIG. 4), the urging force reduction device 100 changes from the state shown in FIG. 12 to the state shown in the upper view of FIG. Transition to the state shown in the figure below. When the seat cushion 2 is lifted, the second end 112 of the torsion spring 110 is lifted upward by the spring support 132 of the cushion rotation bracket 130 as shown by the arrow in the upper diagram of FIG. At this time, the second end 112 of the torsion spring 110 is lifted while moving inward in the seat width direction along the inclined portion 125b of the biasing force adjusting groove 125 provided in the back rotation bracket 120.

  At this time, since the second end 112 of the torsion spring 110 is in contact with the inclined portion 125b, the force by which the second end 112 of the torsion spring 110 pushes the spring support 132 downward is in a seated state (FIG. 12). Therefore, the urging force (pressing force) for urging the lower surface of the seat cushion 2 in the direction in which the lower surface of the seat cushion 2 comes into contact with the base cover 60 is reduced as compared with the case of the seated state. Therefore, when shifting from the sitting state to the tip-up state, the operation load is reduced, and the operability is improved.

  When the seat cushion 2 is further lifted from the state shown in the upper diagram of FIG. 13, the seat cushion 2 moves in the direction shown by the arrow in the lower diagram of FIG. 13 (the direction inward in the seat width direction), and the second end 112 of the torsion spring 110. Is abutted on the regulating portion 125c of the biasing force adjusting groove 125 and is locked. At this time, the second end 112 of the torsion spring 110 is separated from the spring support 132 and is locked by the restricting portion 125c. In other words, the inward movement of the second end 112 of the torsion spring 110 in the sheet width direction is restricted by the restricting portion 125c. Thus, the winding of the torsion spring 110 is stopped. Therefore, the urging force for urging the lower surface of the seat cushion 2 in the direction in which it comes into contact with the base cover 60 is kept constant.

  The urging force reducing device 100 includes a bracket (a back rotation bracket 120 and a cushion rotation bracket 130) for attaching the torsion spring 110 as an urging member to the vehicle seat S, and a first end of the torsion spring 110. The second end portion 112 of the torsion spring 110 urges the lower surface of the seat cushion 2 in a direction in which the lower surface of the seat cushion 2 comes into contact with the base cover 60. Acts on the second end 112 of the torsion spring 110. Therefore, the urging force of the torsion spring 110 can be reduced with a simple configuration.

  In the urging force reducing device 100, when the seat cushion 2 shifts from the seated state to the tip-up state, the spring support 132 (the urging member support) of the cushion rotation bracket 130 attached to the seat cushion 2 is torsioned. The second end 112 of the spring 110 is brought into contact with the urging force adjusting groove 125 (groove) of the back turning bracket 120 attached to the seat back frame 10 of the seat back 1. Therefore, the urging force of the torsion spring 110 can be appropriately reduced.

  The biasing force adjusting groove 125 (groove portion) has an inclined portion 125b, and when the seat cushion 2 shifts from the seated state to the tip-up state, the second end portion 112 of the torsion spring 110 comes into contact with the inclined portion 125b. This reduces the urging force. Further, the biasing force adjusting groove 125 (groove portion) includes a regulating portion 125c. When the seat cushion 2 shifts from the seated state to the tip-up state, the second end 112 of the torsion spring 110 is moved to the regulating portion 125c. The urging force is kept constant by being locked. Therefore, it is possible to appropriately reduce the urging force with a simple configuration.

(Chip up state)
When the sheet state is the tip-up state (FIG. 4), the urging force reducing device 100 is in the state shown in FIG. The second end portion 112 of the torsion spring 110 is kept locked by the restricting portion 125c of the biasing force adjusting groove 125, so that even when the seat cushion 2 is lifted, the torsion spring 110 does not wind down. Further, the inner wall 132a of the spring support portion 132 of the cushion rotation bracket 130 serves as a barrier on the outside in the seat width direction, so that the torsion spring 110 is shifted to the outside in the seat width direction (left side in FIG. 12). Is prevented.

  The vehicle seat S includes a cushion lock device 25 that locks the seat cushion 2 in a tip-up state, and the seat cushion 2 is rotatable with respect to the seat back 1 by a connecting member 5 provided in a seat width direction. The cushion lock device 25 is provided on one connecting member 5 (the right connecting member 5 in FIG. 6) in the seat width direction, and the torsion spring 110 is provided on the other connecting member 5 (FIG. 6). 5). Therefore, the torsion spring 110 and the cushion lock device 25, which is a lock device for the seat cushion 2, can be arranged separately in the left and right connecting members 5 in the seat width direction, so that the seat structure can be made compact.

  In the vehicle seat S described above, the seat cushion 2 is rotatably supported on the rotation axis (the shaft 140 and the cylindrical member 141) with respect to the seat back 1, and the torsion spring 110 is configured to rotate the rotation axis. Attached around. Therefore, the lower surface of the seat cushion 2 can be appropriately placed on the lower surface of the seat cushion 2 by using the first raised portion 61 and the second raised portion 62 of the base cover 60 (the top portion 61a and the second raised portion 62 of the first raised portion 61). Can be biased in the direction of contact with the top 62a).

<Modification>
Although the configuration of the vehicle seat of the present invention has been described above by way of an example, the above-described embodiment is merely an example, and other embodiments are also possible.

  In the above embodiment, as shown in FIG. 10, the first end 111 of the torsion spring 110 is hooked and fixed (locked) to the rear adjustment groove 122 a of the rear surface 122 of the back rotation bracket 120. However, it is also possible to lock the first end 111 of the torsion spring 110 to another part of the vehicle seat S, for example, the seat back 1 or the like. For example, the first end 111 of the torsion spring 110 may be locked and fixed to the seat back frame 10 of the seat back 1.

Reference Signs List 1 seat back 2 seat cushion 2a slit 3 headrest 4 slide rail mechanism (supporting member)
4a Lower rail 4b Upper rail 5 Connecting member 6 Buckle 6a Support bracket 7 Operation strap 10 Seat back frame 11 Connecting link 11a First connecting link 11b Second connecting link 13 Reclining device 20 Seat cushion frame 25 Cushion lock device (lock device)
26 Damper 27 Cable 28 Lock piece 29 Engaging member 29a First engaging hole 29b Second engaging hole 40 Support base (support member)
41 first base bracket 41a flange 41b top 42 second base bracket 42a flange 42b top 43 front connecting member 43a first end 43b second end 43c bending portion 44 rear connecting member 45 connecting member 60 base cover (supporting member)
61 First ridge 61a Top 62 Second ridge 62a Top 63 Front projection 64 Rear projection 65 Luggage accommodation recess 100 Force reduction device 110 Torsion spring (biasing member)
111 1st end 112 2nd end 120 Back rotation bracket (first bracket)
121 side surface 121a opening 122 rear surface 122a rear surface adjusting groove 123 upper surface 124 locking piece 125 urging force adjusting groove (groove)
125a Inlet part 125b Inclined part 125c Restriction part 130 Cushion rotation bracket (second bracket)
131 Side 131a Opening 132 Spring support (biasing member support)
132a Inner wall 133 Mounting part 140 Shaft 141 Cylindrical member (color)
142 Bush F Storage floor S Vehicle seat (Vehicle seat)
Sh seat body

Claims (7)

A vehicle seat,
Seat back,
A seat cushion rotatably supported with respect to the seat back,
A support member that supports a lower surface of the seat cushion when the vehicle seat is in a seated state where a seated person can be seated on the seat cushion;
A biasing member for biasing the seat cushion in a direction in which a lower surface of the seat cushion contacts the support member. The vehicle seat can be switched to a tip-up state in which the seat cushion jumps up toward the seat back,
An urging force reducing device that reduces the urging force of the urging member,
The urging force reducing device reduces an urging force for urging the lower surface of the seat cushion in a direction in which the lower surface of the seat cushion comes into contact with the support member when the seat cushion transitions from the seated state to the tip-up state. The vehicle seat according to claim 1, wherein: The urging force reducing device includes a bracket for attaching the urging member to the vehicle seat,
One end of the urging member is fixed to the bracket or the seat back,
In the seated state, the other end of the biasing member biases the lower surface of the seat cushion in a direction in which the lower surface of the seat cushion comes into contact with the support member,
When the seat cushion shifts from the sitting state to the tip-up state, the urging force reducing device acts on the other end of the urging member to reduce the urging force. 3. The vehicle seat according to 2. The bracket includes a first bracket attached to the seat back, and a second bracket attached to the seat cushion,
The first bracket has a groove for receiving the other end of the biasing member,
The second bracket has an urging member supporting portion that supports the other end of the urging member,
When the seat cushion transitions from the seated state to the tip-up state, the urging member supporting portion abuts the other end of the urging member against the groove, whereby the urging force is reduced. The vehicle seat according to claim 3, wherein: The groove portion includes an inclined portion inclined inward in the width direction of the vehicle seat, and a regulating portion provided inside the inclined portion in the width direction of the vehicle seat,
When the seat cushion shifts from the seated state to the tip-up state, the other end of the urging member abuts on the inclined portion to reduce the urging force, and the other end of the urging member The vehicle seat according to claim 4, wherein the urging force is kept constant by restricting the movement of the vehicle by the restricting portion. The vehicle seat includes a lock device that locks the seat cushion in the tip-up state,
The seat cushion is rotatably supported with respect to the seat back via a first connecting member and a second connecting member extending in a front-rear direction of the vehicle seat,
The lock device is provided on the first connection member,
The vehicle seat according to any one of claims 2 to 5, wherein the biasing member is provided on the second connecting member. The seat cushion is supported rotatably with respect to the seat back on a rotation axis,
The vehicle seat according to any one of claims 1 to 6, wherein the urging member is attached around the rotation shaft.

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