JP2015009733A - Vehicle seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle seat which may store a sheet body in a storage floor with a simple structure and avoids arranging components of the storage structure on a storage floor surface.SOLUTION: A vehicle seat S includes a support base 40 which is attached to a vehicle body floor side and supports a seat back 1. The seat back 1 may rotate around a back rotation shaft 12 attached to the support base 40 so that a seat cushion 2 is moved to the storage floor side. A leg holding member 50, which detachably holds a lower end of a support leg 30 supporting the seat cushion 2, is attached to the support base 40. Further, an inertia lock device 54, which may lock the support leg 30 being held by the leg holding member 50 during a vehicle collision, is provided in the support base 40.

Description

  The present invention relates to a vehicle seat, and more particularly to a vehicle seat capable of storing a seat back and a seat cushion in a storage floor formed at a position lower than a vehicle body floor.

  Conventionally, there are already known vehicle seats in which a seat back and a seat cushion constituting a seat body can be stored in a storage floor formed at a position lower than a vehicle body floor, and the seat body is tilted forward. There is a rear seat for a vehicle that can be stored on a storage floor provided in front of the seat (see, for example, Patent Document 1).

The vehicle seat described in Patent Document 1 is attached to a vehicle body floor, is rotatably supported by a mounting shaft that rotatably supports a seat back, and a holding groove fixed to the storage floor, and is a front portion of the seat cushion. And a retractable leg member that supports the storage structure.
When the seat body is retracted, the seat back rotates to move the seat cushion to the storage floor relative to the vehicle floor, and the retractable leg member rotates around the holding groove in conjunction with the seat back. The main body can be stored on the storage floor.
Further, the vehicle seat can be switched from a seatable state in which an occupant can be seated to a tip-up state in which the seat cushion is flipped upward after the retractable leg member is detached from the holding groove.

JP 2009-67309 A

However, in the seat that can store the seat body on the storage floor as in Patent Document 1, not only the vehicle body floor surface on which the seat body is installed, but also the leg member for rotatably supporting the seat back on the storage floor surface In addition, components such as holding grooves are attached, and the storage structure is complicated to store the seat body.
Therefore, there has been a demand for a vehicle seat that can be stored on the storage floor and has a simple structure and improved support rigidity of the seat body. In addition, a vehicle seat capable of securing a wide storage space has been desired.

Further, in the seat as in Patent Document 1, the leg member that supports the seat cushion is a long member because it is connected between the seat cushion and the storage floor.
Therefore, when switching the seat body between the seatable state and the tip-up state, an operation to detach or attach the leg member from the holding groove is required, but the total length of the leg member is long, The swinging width of the leg member in the front-rear direction is increased, and there is a fear that the operation of mounting the leg member in the holding groove becomes difficult.
Therefore, a vehicle seat that can be easily switched from a seatable state has been desired.

  Furthermore, for seats that can be switched from a seatable state to a seatable state, the seat body can be stably maintained in a seatable state even if inertial force is applied to the seat body due to a frontal collision or a rearward collision of the vehicle. There was a need for technology that could be used.

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 that can be stored on a storage floor with a simple structure.
Another object of the present invention is to provide a vehicle seat that can secure a wide storage space without disposing the structural components of the storage structure on the storage floor surface.
Another object of the present invention is to provide a vehicle seat that can be easily switched from a seatable state.
Another object of the present invention is to provide a vehicle seat capable of stably maintaining a seat body in a seatable state even if an inertial force is applied to the seat body at the time of a vehicle collision. .

  According to the vehicle seat of the present invention, the subject is a vehicle seat capable of storing a seat back and a seat cushion coupled to the seat back on a storage floor formed at a lower position than the vehicle body floor. A support base that is provided on the vehicle body floor, is disposed below the seat cushion and is rotatably connected to a lower end side of the seat back, an upper end side is attached to the seat cushion, and a lower end side is the support base. A support leg to be coupled, a leg holding member attached to the support base and detachably holding the lower end side of the support leg, and attached to the vehicle seat, and holding the support leg to the leg holding member And a lock device that can be locked in a state in which it is locked.

With the above configuration, the support base is provided on the vehicle body floor side and rotatably supports the seat back, the support leg that supports the seat cushion, and the support base is attached to the lower end side of the support leg so as to be detachable. A seat back that constitutes the seat main body with a simple structure that includes a leg holding member and a lock device that can be locked in a state in which the support leg is held by the leg holding member; A vehicle seat capable of storing a seat cushion on a storage floor can be provided.
In addition, since the support base, the support leg, the leg holding member, and the lock device that are the components of the storage structure are all arranged on the vehicle body floor side, a large storage space can be secured on the storage floor.
Further, since the leg holding member is disposed not on the storage floor but on the vehicle body floor side, the overall length of the support leg can be reduced as a result. Since the swinging width of the support leg in the front-rear direction is reduced by the amount of the support leg being small, the support leg is easily held by the leg holding member. Accordingly, the vehicle seat can be easily switched from the seatable state.
In addition, since the lock device that can be locked in a state where the support leg is held by the leg holding member is provided, the vehicle seat can be stably maintained in a seatable state. Furthermore, since the locking device is mounted not on the vehicle body floor but in the vehicle seat, the locking device can be mounted simply by assembling the seat to the vehicle body, resulting in a simple structure.

At this time, the locking device is preferably attached to the support base and disposed between the front end and the rear end of the support base.
With the above configuration, the lock device is attached to a support base having a relatively high support rigidity in the vehicle seat, and is disposed compactly in the front-rear direction of the seat.

At this time, the support base is disposed on the side of the seat, the left and right side base portions to which the lower end side of the seat back is connected, the first base connecting portion that connects the left and right side base portions, and the first A second base connecting portion that connects the left and right side base portions at a position rearward of the base connecting portion, and the locking device is provided between the first base connecting portion and the second base connecting portion. It should be arranged.
With the above configuration, the lock device is attached to a portion of the support base having a relatively high support rigidity, and the attachment rigidity of the lock device is improved.

At this time, the support base includes a holding member support portion that extends in the seat front-rear direction to connect the first base connecting portion and the second base connecting portion, and to which the leg holding member and the locking device are attached. Of the holding member support portion, a portion to which the first base connecting portion is connected and a portion to which the second base connecting portion is connected may be arranged at a position where they overlap in the sheet width direction.
With the above configuration, the mounting rigidity of the leg holding member and the locking device is improved, and the rigidity of the entire seat is improved.
Moreover, since the part to which the 1st base connection part is connected and the part to which the 2nd base connection part are connected are arrange | positioned in the sheet width direction among the holding member support parts, in the sheet width direction The seat can be made compact.

At this time, the second base connection part is formed of a pipe member having a substantially circular cross section, and a portion of the holding member support part connected to the second base connection part is along the second base connection part. It is preferable that a curved portion formed in this way is provided.
With the above configuration, the second base connecting portion has a closed cross-sectional structure, and the holding member support portion is connected along the outer shape of the second base connecting portion, so that the support base support rigidity is improved. .

At this time, the holding member support portion may include a protruding portion that protrudes in the vertical direction on the end side in the sheet width direction.
Further, the protruding portion of the holding member support portion is formed to extend in the front-rear direction of the seat, and a protrusion amount of a portion of the protruding portion that faces the leg holding member in the front-rear direction of the seat is the same as the leg holding member. It should be smaller than the protruding amount of the non-opposing part.
As described above, since the holding member support portion includes the protruding portion, the support rigidity of the holding member support portion is improved.
In addition, as described above, the holding member support portion can improve the support rigidity while suppressing the interference with the support leg held by the leg holding member by adjusting the protrusion amount of the protrusion portion. .

At this time, an operation member capable of changing the position of at least one of the seat back and the seat cushion in a seatable state where an occupant can be seated is provided, and the operation member is disposed behind the second base connecting portion. Good to have been.
With the above configuration, when the seat body is switched between the seatable state and the stowed state, the operation member is opened in consideration of suppressing interference between the component parts and reducing the enlargement of the seat body. It becomes possible to arrange in the space.

At this time, it is preferable that at least a part of the locking device be disposed below the upper surfaces of the first base connecting portion and the second base connecting portion.
With the above configuration, a vertical space between the support base and the seat cushion can be secured. As a result, it is possible to suppress interference between the component parts when the seat body is switched between the seatable state and the stored state.

At this time, the lock device is movable between an engagement position that engages with the support leg held by the leg holding member and an engagement release position that releases the engagement with the support leg. It is preferable that the support base includes an engagement member movement restricting portion that restricts movement of the engagement member from the engagement release position to the opposite side to the engagement position.
With the above-described configuration, the lock device moves the engagement member movable between the engagement position and the engagement release position, and the engagement member moves to the opposite side from the engagement position from the engagement release position. Since the engaging member movement restricting portion for restricting is provided, the switching movement of the engaging member is stabilized, and the seat body can be further stabilized in the seatable state.

At this time, the engaging member movement restricting portion may be a part of the holding member supporting portion and disposed behind the seat of the engaging member.
With the above configuration, since the engaging member movement restricting portion is a part of the holding member supporting portion constituting the support base, the engaging member is supported and supported by the holding member supporting portion having relatively high support rigidity. As a result, the switching movement of the engaging member is further stabilized. Further, since the support base components are used, the number of components can be reduced.

At this time, it is preferable that an extending portion extending in the sheet width direction is formed on the side of the engaging member that contacts the engaging member movement restricting portion.
With the above configuration, since the engaging member includes the extending portion, the rigidity of the engaging member on the side in contact with the engaging member movement restricting portion is improved, and the switching movement of the engaging member is further stabilized.

At this time, the locking device may be arranged at a position overlapping the leg holding member in the vertical direction.
With the above configuration, it is possible to secure a vertical space between the support base to which the inertia lock device and the leg holding member are respectively attached, and the seat cushion.

At this time, the lock device is an inertia lock device that locks the support leg while being held by the leg holding member at the time of a frontal collision or a rearward collision of a vehicle, and the inertial lock device is attached to the support base. A lock rotation shaft that is attached and rotatably supports the engagement member; and a biasing member that biases the engagement member toward the engagement release position with the lock rotation shaft as a center. When the engagement member receives an impact load due to a frontal collision or a rearward collision of the vehicle, and an inertial force acts in a direction toward the engagement position against the urging force of the urging member. The engagement member may regulate the detachment of the support leg from the leg holding member.
With the above configuration, even if an inertial force is applied to the seat body at the time of a vehicle collision, the engagement member of the inertial locking device regulates the detachment of the support leg held by the leg holding member from the leg holding member. As a result, the seat body can be stably maintained in a seatable state.

According to the first aspect of the present invention, the support base is provided on the vehicle body floor side and rotatably supports the seat back, the support leg that supports the seat cushion, and the lower end side of the support leg is attached to the support base. It has a leg holding member that is detachably held and a lock device that can be locked in a state where the support leg is held by the leg holding member, and has a simple structure in which no components are provided on the storage floor. It is possible to provide a vehicle seat that can store the seat back and the seat cushion to be configured on the storage floor.
In addition, since the support base, the support leg, the leg holding member, and the lock device that are the components of the storage structure are all arranged on the vehicle body floor side, a large storage space can be secured on the storage floor.
Further, since the leg holding member is disposed not on the storage floor but on the vehicle body floor side, the overall length of the support leg can be reduced as a result. Since the swinging width of the support leg in the front-rear direction is reduced by the amount of the support leg being small, the support leg is easily held by the leg holding member. Accordingly, the vehicle seat can be easily switched from the seatable state.
In addition, since the lock device that can be locked in a state where the support leg is held by the leg holding member is provided, the vehicle seat can be stably maintained in a seatable state. Furthermore, since the locking device is mounted not on the vehicle body floor but in the vehicle seat, the locking device can be mounted simply by assembling the seat to the vehicle body, resulting in a simple structure.

According to the second aspect of the present invention, the lock device is attached to a support base having a relatively high support rigidity in the vehicle seat, and is compactly disposed in the front-rear direction of the seat.
According to the invention of claim 3, the lock device is attached to a portion of the support base having a relatively high support rigidity, so that the attachment rigidity of the lock device is improved.
According to the invention of claim 4, the mounting rigidity of the leg holding member and the locking device is improved, and the rigidity of the entire seat is improved.
Moreover, since the part to which the 1st base connection part is connected and the part to which the 2nd base connection part are connected are arrange | positioned in the sheet width direction among the holding member support parts, in the sheet width direction The seat can be made compact.

According to the invention of claim 5, the second base connecting portion has a closed cross-sectional structure, and the holding member support portion is connected along the outer shape of the second base connecting portion. Support rigidity is improved.
According to the sixth and seventh aspects of the invention, since the holding member support portion includes the protruding portion, the support rigidity of the holding member support portion is improved.
Moreover, the holding member support part can improve support rigidity, after suppressing the interference with the support leg hold | maintained at a leg holding member by adjusting the protrusion amount of the protrusion part.
According to the invention of claim 8, in consideration of suppressing interference between components when the seat body is switched between the seatable state and the stored state, and reducing the enlargement of the seat body, It becomes possible to arrange the operation member in an empty space.

According to invention of Claim 9, the space of the up-down direction between a support base and a seat cushion is securable. As a result, it is possible to suppress interference between the component parts when the seat body is switched between the seatable state and the stored state.
According to the tenth aspect of the present invention, the lock device includes an engagement member that is movable between the engagement position and the engagement release position, and an engagement position of the engagement member that is opposite from the engagement release position. Since the engaging member movement restricting portion that restricts the movement toward the side is provided, the switching movement of the engaging member is stable, and the seat body can be further stabilized in the seatable state.
According to the eleventh aspect of the invention, since the engaging member movement restricting portion is a part of the holding member supporting portion constituting the supporting base, the engaging member is supported by the holding member supporting portion with relatively high support rigidity. Thus, the movement is restricted, and the switching movement of the engaging member is further stabilized. Further, since the support base components are used, the number of components can be reduced.

According to the twelfth aspect of the present invention, since the engaging member includes the extending portion, the rigidity of the engaging member on the side in contact with the engaging member movement restricting portion is improved, and the switching movement of the engaging member is further improved. Stabilize.
According to the invention of claim 13, it is possible to secure a vertical space between the seat base and the support base to which the inertia lock device and the leg holding member are respectively attached.
According to the invention of claim 14, even if the inertia force is applied to the seat body at the time of the collision of the vehicle, the engagement member of the inertia lock device disengages the support leg held by the leg holding member from the leg holding member. As a result, the seat body can be stably maintained in a seatable state.

1 is a perspective view of a vehicle seat according to the present invention. It is a perspective view of the seat frame used as the frame of a vehicular seat. It is a perspective view of a seat frame, and is a partial enlarged view. It is a perspective view of an inertia lock device of a vehicular seat. It is a figure explaining the operation | movement which the engagement hook of an inertia lock device switches between an engagement position and an engagement release position. It is a side view of a vehicle seat, and is a diagram for explaining an operation of moving from a seatable state to a stored state. It is a side view of a vehicle seat, and is a diagram for explaining an operation of moving to a stored state. It is a side view of a vehicle seat, and is a diagram for explaining an operation of moving from a stored state to a tip-up state. It is a side view of a vehicle seat, and is a diagram illustrating an operation of returning from a tip-up state to a seatable state.

The present embodiment is a vehicle seat that can store a seat body on a storage floor, and is provided with a support base that is attached to the vehicle body floor side and supports the seat back, and the seat back is mounted on the back base. A leg holding member is attached to the support base to removably hold the lower end of the support leg that supports the seat cushion. Furthermore, the present invention relates to an invention of a vehicle seat characterized in that an inertia lock device is provided which can be locked in a state where a support leg is held by a leg holding member in the event of a vehicle collision.
The side on which the occupant sits with respect to the seat back of the vehicle seat is the front side of the seat.

The vehicle seat S of the present embodiment is a rear seat corresponding to a rear seat of the vehicle, for example. In addition, in a vehicle provided with three rows of seats in the vehicle longitudinal direction, it can be used as a second row of middle seats.
As shown in FIG. 1, the vehicle seat S is attached to a vehicle body floor as shown in FIG. 2 and a seat body including a seat back 1, a seat cushion 2, and a headrest 3. Left and right rail devices 4 that are supported in a movable state, a support leg 30 that is mounted between the seat body and the rail device 4 and supports the seat cushion 2, and a support base that rotatably supports the seat back 1. 40 and a leg holding member 50 that is attached to the support base 40 and holds the support leg 30 in a detachable manner.
The vehicle seat S includes a reclining device 13 that rotatably connects the seat back 1 to the support base 40, and a cushion lock device 25 that rotatably connects the seat cushion 2 to the seat back 1. And an inertia lock device 54 that can be locked in a state where the support leg 30 is held by the leg holding member 50 is attached.
On the front side of the vehicle seat S, as shown in FIG. 6, a concave storage floor formed at a position lower than the vehicle body floor is provided.

The vehicle seat S has three types of seat arrangements: a seatable state in which an occupant can be seated, a storage state in which the seat body is stored on the storage floor, and a tip-up state in which the seat body is flipped upward. It is a possible sheet.
Specifically, when the occupant pulls an operation lever (not shown) from the seatable state shown in FIG. 6A, the seat body is folded forward and folded and stored in the storage floor. The storage state is switched to that shown in FIG. Further, the occupant manually raises the seat body upward from the housed state to switch to the tip-up state shown in FIG. Further, when the occupant pulls the support leg 30 functioning as an operation lever from the tip-up state, the seat cushion 2 rotates downward with respect to the seat back 1 and returns to the seatable state. Details will be described later.

As shown in FIG. 1, the seat back 1 is a backrest part that supports the back of the occupant from the back, and the cushion pad 1a is placed on the back frame 10 shown in FIG. It is configured to be covered.
The seat cushion 2 is a seating portion that supports an occupant from below, and the cushion pad 2a is placed on the cushion frame 20 shown in FIG. 2 serving as a skeleton, and is covered with the skin 2b from above the cushion pad 2a. It is configured.
The headrest 3 is a head that supports the occupant's head from the rear, and is configured such that a cushion pad 3a is placed on a pillar (not shown) serving as a core and covered with an outer skin 3b.

The rail device 4 is disposed between the seat main body and the vehicle body floor in the vertical direction. As shown in FIG. 2, the rail device 4 is fixed to the vehicle floor and extends to the left and right lower rails 4a and 4a. The upper and lower upper rails 4b are slidably supported along the upper and lower rails 4b.
A support base 40 is installed on the upper surfaces of the left and right upper rails 4b.
The rail device 4 is provided with a lock member (not shown) that locks the upper rail 4b so as not to slide and an operation member (not shown) that releases the lock state of the lock member.

The back frame 10 is formed of a substantially rectangular frame serving as a skeleton of the seat back 1, and is connected to the support base 40 at the lower left and right outer surfaces of the back frame 10 as shown in FIG. Left and right connecting brackets 11 are attached.
The connection bracket 11 is made of a sheet metal member extending in the vertical direction, and is formed in a substantially bow shape when viewed from the side of the seat. The upper end of the connection bracket 11 is attached to the back frame 10 and the lower end is supported. It is attached to the base 40.

The upper end portion of the connection bracket 11 is disposed between the back frame 10 and the cushion frame 20 in the seat left-right direction.
A back rotating shaft 12 pivotally supported by the support base 40 in the left-right direction is provided at the lower end portion of the left connecting bracket 11, and the back frame with respect to the support base 40 is provided at the lower end portion of the right connecting bracket 11. A reclining device 13 for connecting the 10 to be rotatable is attached.

As shown in FIG. 2, the reclining device 13 is disposed on the left and right inner surfaces of the connection bracket 11 and suppresses interference with the cushion frame 20 in the left-right direction.
The reclining device 13 mainly includes a back rotating shaft 13a and a spiral spring 13b that rotates the back frame 10 forward about the back rotating shaft 13a and biases the back frame 10 to a stored state.
The back rotation shaft 13a is pivotally supported on the back frame 10 side and the support base 40 side in the left-right direction, and one end of the spiral spring 13b is locked to the back frame 10 side, and the other end is the support base 40. It is locked to the side.
The reclining device 13 can be switched to a locked state that locks the rotational movement of the back frame 10, locks the back frame 10 in an upright state, and releases the locked state by operating an operation lever (not shown). The back frame 10 can be rotated forward by the urging force of the spiral spring 13b and folded to the support base 40 side.

The cushion frame 20 is formed of a substantially rectangular frame serving as a skeleton of the seat cushion 2, and as shown in FIG. 2, left and right side frames 21 arranged on the left and right sides, and a front portion of each side frame 21. From the front connection pipe 22 to be connected, the central connection pipe 23 to connect the substantially central portions of the side frames in the front-rear direction, and the pan frame 24 as a plate-like frame to connect the front connection pipe 22 and the central connection pipe 23 It is mainly composed.
The side frame 21 is made of a sheet metal member extending in the front-rear direction, and a front portion thereof is connected to a front connection pipe 22, and a cushion frame 20 is rotated with respect to the back frame 10 at a rear portion and an upper end portion thereof. A cushion lock device 25 that is movably connected is attached.
Note that flanges (not shown) bent to the left and right outer sides are formed on the outer edge of the side frame 21 when viewed from the side of the seat, thereby enhancing the support rigidity of the front connecting pipe 22 and the back frame 10.

As shown in FIG. 2, the cushion lock device 25 includes a cushion rotation shaft 25a and a spiral spring 25b that urges the cushion frame 20 downward about the cushion rotation shaft 25a. I have.
The cushion rotation shaft 25a is pivotally supported by the back frame 10 and the cushion frame 20 in the left-right direction, and one end of the spiral spring 25b is locked to the back frame 10 side, and the other end is on the cushion frame 20 side. It is locked.
The cushion lock device 25 can be switched to a locked state that locks the rotational movement of the cushion frame 20.
As shown in FIG. 7C, the cushion lock device 25 is used when the seat body is stored on the storage floor, specifically, when the back frame 10 is folded to the cushion frame 20 side. The rotation operation of the frame 20 is locked. Then, as shown in FIG. 10, when the support leg 30 functioning as an operation lever is pulled, the locked state is released, and the cushion frame 20 is rotated downward with respect to the back frame 10 by the urging force of the spiral spring 25b. Can do.

As shown in FIG. 2, the front connection pipe 22 is formed of a substantially U-shaped pipe member, and a leg lock device 26 that rotatably connects a support leg 30 to the cushion frame 20 on the left and right inner surfaces thereof. Is attached.
The leg lock device 26 includes a leg rotation shaft 26a and a spring member 26b that urges the support leg 30 on the opposite side of the cushion frame 20 around the leg rotation shaft 26a, in other words, in a direction away from the cushion frame 20. And.
The leg rotation shaft 26a is pivotally supported by the front connection pipe 22 and the upper end portion of the support leg 30 in the left-right direction, and one end of the spring member 26b is locked to the cushion frame 20 side, and the other end is Locked to the support leg 30 side.
The leg lock device 26 can be switched to a locked state that locks the rotation operation of the support leg 30. When the leg lock device 26 is in the retracted state, specifically, as shown in FIG. When the arm is detached from the leg holding member, the rotation of the support leg 30 is locked. Then, as shown in FIG. 10, when the locked support leg 30 is pulled, the locked state is released and the support leg 30 is moved to the leg holding member 50 so as to be returned to the seatable state by the urging force of the spring member 26b. It can be moved to a position where it can be mounted.

As shown in FIG. 2, the support leg 30 is a substantially U-shaped pipe member that supports the seat cushion 2, and includes a leg main body portion 31 disposed on the left and right sides and a lower end portion of each leg main body portion 31. And a leg connecting portion 32 to be connected.
The upper end portion of the leg main body 31 is connected to the left and right inner surfaces of the cushion frame 20 and a substantially central portion in the front-rear direction, and the substantially central portion in the left-right direction of the leg connecting portion 32 is detachable from the leg holding member 50. Is retained.
The upper end portion of the support leg 30 is disposed in front of the seat with respect to the lower end portion of the support leg 30 and is inclined upward and forward from the lower end portion side of the support leg 30 toward the upper end portion side of the support leg 30.

The support base 40 is a member that supports the seat back 1, and as shown in FIG. 3, left and right side base portions 41 disposed along the upper rail 4 b on the left and right sides, and front portions of the side base portions 41. A first base connecting portion 42 for connecting the side base portions 41, a second base connecting portion 43 for connecting a substantially central portion of each side base portion 41, left and right reinforcing base portions 44 attached to the upper surface of each side base portion 41, and A holding member support portion 45 that connects the first base connecting portion 42 and the second base connecting portion 43 and supports the leg holding member 50.
The support base 40 is covered from above by a base cover 60 shown in FIG.

The side base portion 41 is made of a substantially crank-shaped sheet metal member that is long in the front-rear direction, and as shown in FIG. 3, a connecting wall portion 41a connected to the upper surface of the upper rail 4b, and left and right inner end portions of the connecting wall portion 41a. The inner wall portion 41b is bent downward from the inner wall portion 41b, and the outer wall portion 41c is bent upward from the left and right outer end portions of the connecting wall portion 41a.
Of the side base portion 41, flange portions 41d and 41e are formed at the lower end portion of the inner wall portion 41b and the upper end portion of the outer wall portion 41c, respectively, which are bent inwardly on the left and right sides.
Further, a portion of the left side base portion 41 facing the back rotation shaft 12 when viewed from the side of the seat is formed with a substantially semicircular cutout portion 41f. It is easy to assemble from the side of the seat.

As shown in FIG. 3, the first base connecting portion 42 and the second base connecting portion 43 are made of pipe members having a substantially circular cross section extending in the left-right direction, and spaced apart by a predetermined distance in the front-rear direction. Yes.
As shown in FIG. 3, the reinforcing base portion 44 is made of a substantially crank-shaped sheet metal member that is elongated in the front-rear direction. It is mainly composed of an inner wall 44b bent downward from the end and an outer wall 44c bent upward from the left and right outer ends of the connecting wall 44a.
Of the reinforcing base portion 44, a flange portion 44d bent to the left and right inner sides is formed at the lower end portion of the inner wall portion 44b, and a flange portion 44e bent to the left and right outer sides is formed at the upper end portion of the outer wall portion 44c. Is formed.

The left and right end portions of each of the first base connecting portion 42 and the second base connecting portion 43 are connected so as to be sandwiched between the side base portion 41 and the reinforcing base portion 44 as shown in FIG.
The reinforcing base portion 44 is attached to the side base portion 41 at the connecting wall portion 44a, and the flange portion 44e and the flange portion 41e of the side base portion 41 are vertically overlapped to form a closed cross-sectional structure. The support rigidity of the support base 40 is improved.
In other words, the support base 40 has a middle shape.
The left reinforcing base portion 44 is sandwiched and connected between the connection bracket 11 and the side base portion 41 in the left-right direction.

As shown in FIG. 3 or 4, the holding member support portion 45 is a curved sheet metal member that supports the leg holding member 50, extends in the front-rear direction of the seat, and has a front portion attached to the first base connecting portion 42. The rear portion is attached to the second base connecting portion 43.
At this time, the part attached to the 1st base connection part 42 and the part attached to the 2nd base connection part 43 among the holding member support parts 45 are arrange | positioned in the position which overlaps in the left-right direction.

As shown in FIG. 4, the holding member support portion 45 is formed at a substantially central portion in the front-rear direction and is formed at a center portion 45 a that is bent below the front portion and the rear portion, and at both end portions in the left-right direction. Are formed at the front end portion and the rear end portion of the projecting portion 45b, respectively, and are formed on the right outer surface of the rear portion of the holding member support portion 45. A movement restricting portion 45d for restricting movement of an engagement hook 55 described later.
The movement restricting portion 45d corresponds to the engaging member movement restricting portion in the claims.

The central portion 45a is formed to extend to both left and right ends of the holding member support portion 45, and the leg holding member 50 is attached to the upper surface of the central portion 45a.
The central portion 45 a is bent along the outer shape of the leg holding member 50, and has a shape that ensures the support rigidity of the leg holding member 50.

The protruding portion 45b is formed to extend to both front and rear end portions of the holding member support portion 45. Of the protruding portion 45b, the protruding amount of the portion facing the leg holding member 50 in the front-rear direction does not face the leg holding member 50. It is smaller than the protruding amount.
The curved portion 45c is formed so as to be cut out toward the front and rear inner sides at the front end portion and the rear end portion of the projecting portion 45b, and the first base coupling portion 42 is coupled to the front surface of the curved portion 45c on the front end side. The second base connecting portion 43 is connected to the rear surface of the curved portion 45c on the rear end side.
More specifically, the first base connecting portion 42 is in contact with the upper surface portion on the front end side of the holding member support portion 45 and the front surface of the curved portion 45c, and is joined by welding or the like. The 2nd base connection part 43 is also the same.
The curved portion 45c is formed in a substantially arc shape along the outer shapes of the first base connecting portion 42 and the second base connecting portion 43, and has a shape that secures connection rigidity.

As shown in FIG. 3, the leg holding member 50 is formed of a substantially U-shaped clip member that detachably holds the support leg 30. The leg holding member 50 is a bottom that connects the pair of side wall portions 51 and the lower end portions of the side wall portions 51. And a wall portion 52.
Each side wall 51 is bent in a direction close to each other from the lower end to the upper end. In other words, the side wall 51 is bent in the opening inward direction so as to narrow the opening of the leg holding member 50. Is formed with a curled portion 53 that is bent in the outward direction of the opening.
The bottom wall portion 52 has a curved shape and is attached so as to be along the central portion 45 a of the holding member support portion 45. More specifically, the bottom wall portion 52 includes a notch-raised portion (not shown) that is partially cut and raised, and the cut-and-raised portion is latched in a not-shown latching groove formed in the central portion 45a. It is attached with.

The leg holding member 50 is supported by the holding member support portion 45 at a position inclined backward with a predetermined inclination angle with respect to the horizontal plane. In other words, the leg holding member 50 is supported by the holding member support portion 45 at a position where the opening portion is directed obliquely upward and forward.
The leg holding member 50 is formed so that the width of the opening is slightly narrower than the width diameter of the support leg 30, and the leg holding member 50 is elastically deformed to hold the support leg 30 in a detachable manner.
An inertia lock device 54 is disposed in a portion adjacent to the leg holding member 50 in the left-right direction.

The inertia lock device 54 is a device that can be locked in a state in which the support leg 30 is held by the leg holding member 50 at the time of a frontal collision of the vehicle, and as shown in FIG. 4, the holding member support portion 45 of the support base 40. It is attached to the right side of the.
The inertia lock device 54 is disposed between the first base coupling portion 42 and the second base coupling portion 43 in the front-rear direction, and is disposed at a position overlapping the leg holding member 50 in the vertical direction.

The inertia lock device 54 includes an engagement hook 55 that can be engaged with the support leg 30, a lock rotation shaft 56 that is attached to the lower surface of the holding member support portion 45 and supports the engagement hook 55 so as to be rotatable. An urging spring 57 that urges the hook 55 in a direction to release the engagement with the support leg 30 is mainly provided.
The engaging hook 55 corresponds to the engaging member in the claims, and the biasing spring 57 corresponds to the biasing member in the claims.

As shown in FIG. 5A, the engagement hook 55 is disengaged from the support leg 30 held by the leg holding member 50, and as shown in FIG. The hook member is movable between an engagement position engaged with the support leg 30 and is formed in a substantially U shape when viewed from the side of the seat.
More specifically, the engagement hook 55 is configured to be rotatable in the front-rear direction between the engagement release position and the engagement position about the lock rotation shaft 56.

As shown in FIG. 4, the engagement hook 55 is formed on the front end side of the hook main body 55 a that is rotatably connected to a lock rotation shaft 56 that is long in the left-right direction, An engagement portion 55b that can be engaged with the support leg 30, a front contact portion 55c that is formed on the front end side of the hook body portion 55a and below the engagement portion 55b, and is capable of contacting the support leg 30; A rear extension 55d formed in the rear end side of the hook body 55a and extending in the left-right direction.
The rear extension 55d corresponds to the extension of the claims.

The engaging portion 55b has a hook shape protruding forward, and is located above the leg holding member 50 when in the disengagement position shown in FIG. 5 (a), as shown in FIG. 5 (b). When in the illustrated engagement position, it is positioned so as to overlap the leg holding member 50 in the vertical direction and is disposed above the leg connecting portion 32 at the lower end of the support leg 30.
Further, when the engagement portion 55b is in the engagement position, the engagement portion 55b is opposed to the leg coupling portion 32 of the support leg 30 by a predetermined distance in the forward oblique front direction, specifically, in the disengagement direction of the support leg 30. Is arranged in.

The front abutting portion 55c is a portion that protrudes forward, and is in a position overlapping the leg holding member 50 in the vertical direction when in the disengagement position, and the support leg 30 attached to the leg holding member 50. It is arrange | positioned in the position which can contact | abut.
Further, the front abutting portion 55 c is located below the leg holding member 50 when in the engaged position, and is disposed at an opposing position where it abuts on the leg connecting portion 32 at the lower end portion of the support leg 30.

As shown in FIG. 4, the rear extension portion 55 d is formed of a bent portion obtained by bending the rear end portion of the hook main body portion 55 a in the left-right direction, and extends in the left-right direction. Increases rigidity.
At this time, the movement restricting portion 45d of the holding member support portion 45 is disposed behind the engagement hook 55, and the engagement hook 55 moves to the opposite side from the engagement position from the engagement release position. It is something to regulate. Specifically, it is configured to be able to contact the rear end of the hook body 55a when in the disengagement position.
Therefore, the rear extension portion 55d improves the rigidity of the rear end portion of the engagement hook 55 that contacts the movement restricting portion 45d, and the switching movement of the engagement hook 55 is stabilized.

  The urging spring 57 is attached so as to be wound around the outer peripheral surface of the lock rotation shaft 56, one end is locked to the engagement hook 55 side, and the other end is locked to the holding member support portion 45 side. The engagement hook 55 is urged toward the engagement release position with respect to the lock rotation shaft 56.

When the engagement hook 55 is in the disengagement position shown in FIG. 5A, the engagement hook 55 is attached to the second base connecting portion 43 and the holding member support portion 45 at a position inclined backward at a predetermined inclination angle with respect to the horizontal plane. It is arranged to be supported.
Specifically, the engagement hook 55 is urged toward the engagement release position by the urging spring 57, while the rear end of the engagement hook 55 is connected to the movement restricting portion 45d of the holding member support portion 45 shown in FIG. Since the movement is restricted by contacting, it is positioned at the disengagement position.

When the support hook 30 is mounted on the leg holding member 50 when the engagement hook 55 is in the disengagement position, the support leg 30 contacts the front contact portion 55c and presses the front contact portion 55c downward. It will be. As a result, as shown in FIG. 5 (b), the engagement hook 55 rotates and moves forward about the lock rotation shaft 56 against the urging force of the urging spring 57, and the engagement portion 55b is moved. It is positioned at the engagement position so as to cover the support leg 30, in other words, so as to cover the opening portion of the leg holding member 50.
When the support leg 30 is detached from the leg holding member 50 when the engagement hook 55 is in the engagement position, the support leg 30 and the front contact portion 55c are separated from each other. As a result, the engagement hook 55 is rotated rearward about the lock rotation shaft 56 by the urging force of the urging spring 57 and is positioned again at the engagement release position shown in FIG.

  When the seat body is in the seatable state, the engagement hook 55 is positioned at the engagement position. When the seat body is in the retracted state or the tip-up state, the engagement hook 55 is in the engagement release position. Will be positioned.

In the above configuration, the inertia lock device 54 is in a state where the support leg 30 is held by the leg holding member 50 when a frontal collision of the vehicle occurs when the engagement hook 55 is in the engagement position shown in FIG. It has a function to lock with.
Specifically, when the engagement hook 55 receives an impact load due to a frontal collision of the vehicle, the inertial force acts in a direction toward the engagement position side against the urging force of the urging spring 57. .
Then, as shown in FIG. 5C, the engagement hook 55 moves to a position where the separation of the support leg 30 from the leg holding member 50 is restricted.

Here, an engagement groove portion 30a is formed in a portion of the outer surface of the lower end portion of the support leg 30 that faces the engagement portion 55b of the engagement hook 55 in the left-right direction.
As shown in FIG. 5C, the engagement hook 55 is configured such that the engagement portion 55 b engages with the engagement groove portion 30 a at the time of a frontal collision of the vehicle, and the leg holding member 50 of the support leg 30. Can be controlled from leaving.
More specifically, the engagement hook 55 receives an inertial force acting in front of the seat and moves forward from the engagement position shown in FIG. 5B to the disengagement restriction position shown in FIG. To do. On the other hand, the support leg 30 similarly receives the inertial force acting in front of the seat and moves in the forward direction, that is, in the direction away from the leg holding member 50.
As a result, the engagement portion 55b of the engagement hook 55 and the engagement groove portion 30a of the support leg 30 are engaged. After the vehicle collision, the engagement hook 55 and the support leg 30 return to the engagement position shown in FIG.

More specifically, when the engagement portion 55b is in the engagement position shown in FIG. 5B, the engagement portion 55b is positioned above the engagement groove portion 30a of the support leg 30, and in the front-rear direction, It is arranged at the overlapping position.
Because of this arrangement, when the support leg 30 is about to be detached from the leg holding member 50, the engagement portion 55b and the engagement groove portion 30a do not engage with each other when the support leg 30 is in the engagement position. It is possible to easily switch from the state to the storage state or the chip-up state.
On the other hand, as shown in FIG. 5C, the engaging portion 55b is positioned above the engaging groove portion 30a of the support leg 30 at the time of a vehicle collision, and is disposed at a position ahead of the engaging groove portion 30a in the front-rear direction. Will be.
As a result, when the engagement hook 55 is in the position of FIG. 5C, the engagement portion 55b and the engagement groove portion 30a are engaged when the support leg 30 is about to be detached from the leg holding member 50. Accordingly, the seatable state is stably maintained without the support leg 30 being detached.

  The base cover 60 is a resin molded product that covers the entire support base 40 from above. As shown in FIG. 1, the base cover 60 is disposed in front of the leg accommodating recess 61 that accommodates the support leg 30, and the leg accommodating recess 61. A leg guide portion 62 for guiding the support leg 30 detached from the holding member 50 so as to be accommodated on the seat cushion 2 side is mainly provided.

The leg housing recess 61 is a substantially U-shaped recess recessed downward from the upper surface of the base cover 60, and is formed as a long body extending in the left-right direction.
The leg receiving recess 61 is disposed at a position where the opening portion is inclined obliquely upward and forward, and is formed so as to be wider from the bottom surface portion toward the opening portion side, and the leg receiving recess 61 receives the support leg 30. The shape is easy to do.

A through hole (not shown) is formed in the leg receiving recess 61, and a pair of side wall portions 51 and a curl portion 53 constituting the leg holding member 50 are exposed to the outside from the back surface side of the base cover 60 through the through holes. It is configured as follows.
The leg housing recess 61 is further formed with a through hole (not shown) so that the inertia lock device 54 is exposed to the outside from the back surface side of the base cover 60 through the through hole.

The leg guide portion 62 is a long body that includes a convex portion that protrudes upward from the upper surface of the base cover 60 and extends in the front-rear direction.
As shown in FIG. 1, the leg guide portion 62 is disposed in front of the support leg 30 and is in contact with the support leg 30 detached from the leg holding member 50 and the leg receiving recess 61 when being seated. 30 guides and rotates the seat cushion 2 around the leg rotation shaft 26a.

  Next, the operation of moving the vehicle seat S from the seatable state to the stored state will be described with reference to FIGS. 6 and 7, the reclining device 13, the cushion locking device 25, and the leg locking device 26 indicate a locked state when illustrated with a black circle, and an unlocked state when illustrated with a white circle. Shall be shown. The same applies to FIGS. 8 and 9.

When the vehicle seat S is in the seatable state shown in FIG. 6A, the seat back 1 is supported by the support base 40 and locked in the standing state by the reclining device 13, and the seat cushion 2 holds the legs. It becomes the structure supported by the support leg 30 hold | maintained at the member 50. FIG.
The leg rotation shaft 26a at the upper end of the support leg 30 is disposed in front of the seat with respect to the leg holding member 50 when in the seatable state.

When the vehicle seat S is moved from the seatable state to the stowed state, for example, an operation lever (not shown) provided on the upper surface of the seat back 1 is operated.
When the occupant operates the operation lever, as shown in FIG. 6B, the locked state of the reclining device 13 is released, and the seat back 1 moves the seat cushion 2 to the storage floor by the urging force of the spiral spring 13b. Rotation is started toward the front side of the seat around the back rotation shaft 13a so as to move.
The support leg 30 starts to rotate toward the seat cushion 2 around the leg rotation shaft 26 a with respect to the seat cushion 2 in conjunction with the rotation of the seat back 1. At this time, since the support leg 30 is stretched between the seat cushion 2 and the vehicle body floor side, the seat cushion 2 and the seat back 1 can be moved stably.
A known cable (not shown) is connected between the operation lever and the reclining device 13, and the cable is pulled by the operation of the operation lever to release the locked state.

As shown in FIG. 7A, when the seat back 1 reaches a predetermined rotational position, the support leg 30 is detached from the leg holding member 50. In other words, the support leg 30 is detached from the leg holding member 50 when the support leg 30 reaches a predetermined rotation position in conjunction with the rotation of the seat back 1.
The detached support leg 30 is rotated by the leg lock device 26 so as to be folded toward the seat cushion 2 around the leg rotation shaft 26a against the urging force of the spring member 26b. And the support leg 30 is locked in the state accommodated in the seat cushion 2 side.

As shown in FIG. 7B, when the seat back 1 reaches a predetermined rotational position, the front end portion of the seat cushion 2 comes into contact with the storage floor surface before the support legs 30.
Sliding members (not shown) that are slidable with respect to the storage floor surface are attached to both front and rear ends of the seat cushion 2, and the seat cushion 2 faces the front side of the seat as the seat back 1 rotates. The storage floor surface can be slid stably.
The sliding member only needs to be attached to at least one of the front and rear end portions of the seat cushion 2.

By the above series of operations, as shown in FIG. 7C, the seat body is stored on the storage floor, and the vehicle seat S is switched to the stored state.
The seat cushion 2 is locked by the cushion lock device 25 when in the retracted state, specifically when the seat back 1 is folded to the seat cushion 2 side.
The support leg 30 is disposed at a position lower than the leg holding member 50 in the stored state.

Next, an operation for moving the vehicle seat S from the stored state to the tip-up state will be described with reference to FIG.
When the vehicle seat S is in the stored state shown in FIG. 8A, for example, the occupant manually raises the seat body to switch to the tip-up state shown in FIG. 8B.
At this time, since the cushion lock device 25 locks the rotational movement of the seat cushion 2, the seat cushion 2 can be raised integrally by raising the seat back 1 upward.
In the tip-up state, a large cargo space can be secured on the front side of the seat by sliding the upper rail 4b to the rear side of the seat with respect to the lower rail 4a.

  When the vehicle seat S is switched to the tip-up state shown in FIG. 8B, the seat back 1 returns to the same position as the seatable state and is locked in the standing state by the reclining device 13. .

Next, the operation of moving the vehicle seat S from the tip-up state to the seatable state will be described based on FIG.
When the vehicle seat S is moved from the tip-up state to the seatable state, as shown in FIG. 9A, for example, the support leg 30 that functions as an operation lever is operated.
The cushion lock device 25 and the lock state of the leg lock device 26 are released by the passenger pulling the support leg 30 upward about the leg rotation shaft 26a, in other words, by pulling it away from the seat cushion 2 side. Is done.
A known cable (not shown) is connected between the support leg 30 and the cushion lock device 25, and the cable is pulled by an operation of the support leg 30 to release the locked state. .

With the release of the cushion lock device 25, the seat cushion 2 rotates downward with respect to the seat back 1 by the urging force of the spiral spring 25b as shown in FIG. 9B.
As the leg lock device 26 is released, the support leg 30 rotates about the leg rotation shaft 26a to a position where it can be attached to the leg holding member 50 by the urging force of the spring member 26b, and is attached to the leg holding member 50. Will be.
At this time, the support leg 30 moves toward the leg holding member 50 attached to the lower end side of the leg receiving recess 61 by being guided by the leg receiving recess 61 and the leg guide 62 in the base cover 60. To come.
By the series of operations described above, the vehicle seat S returns to the seatable state shown in FIG.

In the above configuration, as shown in FIG. 6, the leg holding member 50 is disposed behind the seat in the vehicle body floor with respect to the stepped portion connected to the storage floor.
By comprising in this way, the support leg 30 hold | maintained at the leg holding member 50 can be arrange | positioned compactly. Further, the support leg 30 supports the substantially central portion of the seat cushion 2 in the front-rear direction, and the support rigidity of the seat cushion 2 can be increased.
The vehicle body floor includes a step portion and does not include a storage floor.

  In the above embodiment, the storage floor is formed in front of the vehicle seat S. However, the storage floor is not limited to this, and the storage floor may be formed in the rear of the vehicle seat S.

In the above embodiment, the rail device 4 includes a lock member (not shown) that locks the upper rail 4b so as not to slide, and an operation member (not shown) that releases the lock state of the lock member. In the support base 40, it is preferable to be disposed behind the second base connecting portion 43. With such a configuration, a free space can be used effectively.
In addition, an operating member capable of changing the position of at least one of the seat back 1 and the seat cushion 2 in the seatable state can be separately disposed in the vacant space behind the second base connecting portion 43.

  In the above embodiment, as shown in FIG. 7C, the cushion lock device 25 is switched to a locked state that locks the rotational operation of the seat cushion 2 in the retracted state, but is not limited thereto. 8B may be configured to switch to the locked state in the chip-up state shown in FIG.

In the above-described embodiment, the support leg 30 is configured to rotate to the rear side about the leg rotation shaft 26a with respect to the seat cushion 2 and to be stored on the seat cushion 2 side when switching from the seatable state to the stored state. However, the present invention is not limited to this, and the support leg 30 may be configured to rotate forward with respect to the leg rotation shaft 26a and to be housed on the seat cushion 2 side.
At this time, the upper end portion of the support leg 30 is disposed rearward of the seat with respect to the lower end portion of the support leg 30 and is inclined upward rearward from the lower end portion side of the support leg 30 toward the upper end portion side of the support leg 30. It may be easy to store and rotate on the seat cushion 2 side.

In the above embodiment, the support base 40 is fixed to the vehicle body floor via the rail device 4 as shown in FIG. 2, but the present invention is not limited to this. You may change suitably, such as providing.
Further, as shown in FIG. 2, the support base 40 is configured to rotatably support the seat back 1 via the connection bracket 11, but the support base 40 is not limited to this and may be changed as appropriate.
For example, the support base 40 is configured to indirectly support the seat back 1 via the seat cushion 2, and includes another embodiment in which the seat back 1 is rotatably connected to the seat cushion 2. It is.
Moreover, the structure which attaches the seat back 1 directly to the support base 40 so that the connection bracket 11 is unnecessary is also included as another embodiment.
Further, although the support base 40 and the connection bracket 11 are different components, a configuration in which the support base 40 includes the connection bracket 11 is also included.

In the above embodiment, the movement restricting portion 45d of the holding member support portion 45 is a portion that restricts the movement of the engagement hook 55 as shown in FIG. The second base connecting portion 43 of the support base 40 may be a portion that restricts the movement of the engagement hook 55.
Specifically, the second base connecting portion 43 and the rear extending portion 55d of the engaging hook 55 are preferably configured to be able to contact in the front-rear direction.
By comprising in this way, the contact area of the engagement hook 55 and the part which functions as a movement control part becomes large, and the switching movement of an engagement member will become still more stable.

In the above-described embodiment, the inertia lock device 54 includes a device that locks the support leg 30 while being held by the leg holding member 50 at the time of a frontal collision of the vehicle. A device that locks the support leg 30 may be used.
Specifically, the inertia lock device 54 is disposed at the rear of the seat of the support leg 30 for a front collision, but in order to use at the time of a rear collision, the support leg 30 is reversed at the boundary, It may be arranged in front of the seat. Furthermore, instead of the second base connecting portion 43, the first base connecting portion 42 may function as a movement restricting portion for the engagement hook 55.
With this configuration, the inertial locking device 54 can be attached to the seat for use in a rear collision of the vehicle. At this time, both inertial locking devices for the front collision and the rear collision may be provided.

In the above-described embodiment, the inertia lock device 54 includes a device that locks the support leg 30 while being held by the leg holding member 50 at the time of a frontal collision of the vehicle. It may be configured as a possible locking device.
With such a configuration, for example, an operation of locking the support leg when the seat body is in a seatable state is enabled, and an occupant can stably sit on the seat body.

In the above embodiment, the inertia lock device 54 is attached to the holding member support portion 45 of the support base 40, but is not limited thereto, and may be attached to the vehicle seat S.
In addition, the inside of the vehicle seat S includes all parts attached to the inside of the vehicle seat S or on the vehicle seat S.

  In the above-described embodiment, a stowable vehicle seat used for an automobile has been described as a specific example. However, the seat is not limited to this, and a vehicle seat such as a train or a bus, or a vehicle seat such as an airplane or a ship. Can also be used.

In the present embodiment, the vehicle seat S according to the present invention has been mainly described.
However, said embodiment is only an example for making an understanding of this invention easy, and does not limit this invention. The present invention can be changed and improved without departing from the gist thereof, and the present invention includes the equivalents thereof.
In particular, the shape, arrangement, and configuration of the support leg 30, the support base 40, the leg holding member 50, and the inertia lock device 54 described in the above embodiment are merely examples, and the present invention is limited. Not what you want.

S Vehicle seat 1 Seat back 1a, 2a, 3a Cushion pad 1b, 2b, 3b Outer skin 2 Seat cushion 3 Headrest 4 Rail device 4a Lower rail 4b Upper rail 10 Back frame 11 Connecting bracket 12 Back rotating shaft 13 Reclining device 13a Back rotating Axis 13b Spiral spring 20 Cushion frame 21 Side frame 22 Front connection pipe 23 Center connection pipe 24 Pan frame 25 Cushion lock device 25a Cushion rotation shaft 25b Spiral spring 26 Leg lock device 26a Leg rotation shaft 26b Spring member 30 Support leg 30a Engagement Joint groove portion 31 Leg body portion 32 Leg connecting portion 40 Support base 41 Side base portion 41a Support wall portion 41b Inner side wall portion 41c Outer side wall portion 41d, 41e Flange portion 41f Notch portion 42 First base S connection part 43 2nd base connection part 44 Reinforcement base part 44a Connection wall part 44b Inner wall part 44c Outer wall part 44d, 44e Flange part 44f Base attachment part 44g Projection part 45 Holding member support part 45a Center part 45b Projection part 45c Curve Part 45d movement restricting part 50 leg holding member 51 side wall part 52 connecting wall part 53 curl part 54 inertia lock device 55 engaging hook 55a hook body part 55b engaging part 55c front contact part 55d rearward extension part 56 lock rotation shaft 57 Biasing spring 60 Base cover 61 Leg housing recess 62 Leg guide part

Claims (14)

A vehicle seat capable of storing a seat back and a seat cushion coupled to the seat back in a storage floor formed at a position lower than a vehicle body floor,
A support base which is provided on the vehicle body floor and which is disposed below the seat cushion and is rotatably connected to a lower end side of the seat back;
A support leg having an upper end attached to the seat cushion and a lower end connected to the support base;
A leg holding member attached to the support base and detachably holding the lower end side of the support leg;
A vehicular seat comprising: a locking device mounted in the vehicular seat and capable of locking in a state where the support leg is held by the leg holding member.   The vehicle seat according to claim 1, wherein the locking device is attached to the support base and is disposed between a front end and a rear end of the support base. The support base is disposed on the side of the seat, and left and right side base portions to which the lower end side of the seat back is connected, a first base connection portion that connects the left and right side base portions, and the first base connection portion A second base coupling portion that couples the left and right side base portions at a position rearward than,
The vehicle seat according to claim 1 or 2, wherein the locking device is disposed between the first base connecting portion and the second base connecting portion. The support base includes a holding member support portion that extends in the front-rear direction of the seat to connect the first base connecting portion and the second base connecting portion, and to which the leg holding member and the locking device are attached.
Of the holding member support portion, a portion to which the first base connecting portion is connected and a portion to which the second base connecting portion is connected are arranged at positions overlapping in the sheet width direction. The vehicle seat according to claim 3. The second base connecting portion is a pipe member having a substantially circular cross section,
The curved part formed along the said 2nd base connection part is provided in the part connected with the said 2nd base connection part among the said holding member support parts, The Claim 4 characterized by the above-mentioned. The vehicle seat as described.   The vehicle seat according to claim 4, wherein the holding member support portion includes a protruding portion that protrudes in an up-down direction on an end side in a seat width direction. The protrusion of the holding member support is formed to extend in the front-rear direction of the seat,
7. The vehicle according to claim 6, wherein a protruding amount of a portion of the protruding portion facing the leg holding member in the front-rear direction of the seat is smaller than a protruding amount of a portion not facing the leg holding member. Sheet. An operation member capable of changing the position of at least one of the seat back and the seat cushion in a seatable state where an occupant can sit;
The vehicle seat according to any one of claims 3 to 7, wherein the operating member is disposed behind the second base connecting portion.   The at least one part of the said locking device is arrange | positioned so that it may be located below each upper surface of the said 1st base connection part and the said 2nd base connection part. The vehicle seat according to claim 1. The lock device includes an engagement member that is movable between an engagement position that engages with the support leg held by the leg holding member and an engagement release position that releases the engagement with the support leg. Prepared,
The said support base is provided with the engagement member movement control part which controls the movement to the opposite side to the engagement position of the said engagement member from the engagement cancellation | release position. The vehicle seat according to claim 1.   The vehicle seat according to claim 10, wherein the engagement member movement restricting portion is a part of the holding member support portion and is disposed behind the seat of the engagement member.   The vehicle seat according to claim 10 or 11, wherein an extension portion extending in a seat width direction is formed on a side of the engagement member that contacts the engagement member movement restricting portion. .   The vehicle seat according to any one of claims 1 to 12, wherein the locking device is disposed at a position overlapping the leg holding member in the vertical direction. The lock device is an inertia lock device that locks the support leg in a state of being held by the leg holding member at the time of a front collision or a rear collision of a vehicle,
The inertia lock device is attached to the support base, and is attached to a lock rotation shaft that rotatably supports the engagement member, and the engagement member is attached to the engagement release position side about the lock rotation shaft. An urging member for energizing,
When the engagement member receives an impact load due to a frontal collision or a rearward collision of the vehicle, and an inertial force acts in a direction toward the engagement position against the urging force of the urging member. ,
The vehicle seat according to any one of claims 1 to 13, wherein the engagement member regulates separation of the support leg from the leg holding member.

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