JP5151641B2 - Double folding mechanism for vehicle seat - Google Patents

Description

  The present invention relates to a double folding mechanism for a vehicle seat. More specifically, the present invention relates to a double folding mechanism for a vehicle seat having a turning mechanism that supports a seat cushion that serves as a seating portion so that the seat cushion can be turned upside down.

2. Description of the Related Art Conventionally, there is a vehicle rear seat that employs a mechanism that retracts and moves a seat when not in use so that the space in which the seat is installed can be used as a cargo space. As such a storage mechanism, for example, a double folding mechanism disclosed in Patent Document 1 below is known.
As shown in FIG. 7, the double folding mechanism 120 includes a seat cushion connection structure 140 that is a connection structure between the seat cushion 200 and the vehicle body floor F, and a seat back that is a connection structure between the seat back 300 and the vehicle body floor F. The connection structure 160 is used.
The seat cushion coupling structure 140 is configured such that the seat cushion 200 serving as a seating portion is moved from the seat cushion sitting posture state position 200X to the vehicle body floor F from the vehicle body floor F by the rotation mechanism 330 provided at the front end thereof. On the other hand, the seat cushion is raised to the stowed storage posture state position 200Z.
The seat back coupling structure 160 is configured such that the seat back 300 serving as a backrest portion has a reclining mechanism 360 provided at the lower end thereof as a rotation center toward the installation space of the seat cushion seating posture state position 200X. Can be defeated. Therefore, when the seat is not in use, the seat cushion 200 is raised to free up the space in which the seat is installed, and the seat back 300 is brought down into the free space so that the seat is in a compact posture as a whole. Can be stored.

The fixing of the seat cushion 200 in the seat cushion sitting posture state position 200X on the vehicle body floor F in this disclosed technique is roughly fixed by two fixing mechanisms. First, a holding mechanism 600 is provided on a lower surface portion of the seat cushion 200 facing the vehicle body floor F, and the seat cushion 200 and the rotation mechanism 330 are fixed. This holding mechanism 600 is for restricting the posture of the seat cushion 200 in the vehicle front-rear direction with respect to the vehicle body floor from being changed by the rotation of the rotation mechanism 330.
Second, the seat cushion side engaging member 260 provided at the lower end of the rear portion of the seat cushion 200 and the vehicle body floor side engaged member 390 provided at the position of the lower end portion of the seat back 300 on the vehicle body floor F side. Are fixed by engaging with each other. The engagement by both the engaging members regulates the upward movement of the seat cushion 200 from the seat cushion sitting posture state position 200X. With the above two fixing mechanisms, the movement of the seat cushion 200 by the turning mechanism 330 is restricted, and the seat cushion 200 can be held at the seat cushion seating posture state position 200X.

The shape of the seat cushion 200 is such that the seat cushion 200 is positioned at the seat cushion seating posture state position 200X in order to minimize the gap formed between the rear end portion of the seat cushion 200 and the lower end portion of the seat back 300. When doing so, the rear end portion of the seat cushion 200 is shaped to sink into the lower portion of the seat back 300. Therefore, the seat cushion 200 lifts the front end portion with respect to the vehicle body floor F so that the rear end portion of the seat cushion 200 interferes with the lower end portion of the seat back 300 and is not hindered. By setting the seat cushion in the flipped-up state position 200Y, the upright rotation and the overturning rotation are performed.
JP 2002-331861 A

  However, in the above prior art, the seat cushion 200 is moved to the seat cushion spring-up state position 200Y in the overturning turning process in which the seat cushion 200 raised to the front side of the vehicle is returned to the seating posture state position on the vehicle body floor F again. There is a need to. However, the rotation mechanism of the seat cushion 200 has two rotation shafts, a rotation shaft for changing the posture of the seat cushion 200 and a rotation shaft for raising the seat cushion 200 with respect to the vehicle body floor F. Therefore, there is a problem that it is difficult to grasp whether or not the posture position of the seat cushion 200 is the seat cushion flip-up state position 200Y when the seat cushion 200 is moved.

As shown in FIG. 8, one holding mechanism 600 of the seat cushion 200 fixing mechanism fixes the seat cushion 200 and the rotating mechanism 330 even when the seat cushion 200 is raised from the seating portion. The problem was that the structure could be made possible. That is, when the seat cushion 200 is turned down from the seat cushion storage posture state position 200Z (see FIG. 7) to the seat cushion seating posture state position 200X (see FIG. 7), before the seat cushion 200 falls down to the seating portion. There is a problem that the seat cushion 200 and the rotation mechanism 330 are fixed by the holding mechanism 600 and the seat cushion side engaging member 260 cannot be engaged with the vehicle body floor side engaged member 390 in a normal state.
That is, in this state, when the seat cushion 200 is turned to the seating posture state position on the vehicle body floor F, the seat cushion 200 is visually returned to the seat cushion seating posture state position 200X (see FIG. 7). However, the seat cushion side engaging member 260 is put on the vehicle body floor side engaged member 390, and the both engaging members are not engaged. For this reason, one of the fixing mechanisms of the seat cushion 200 does not work effectively, and there is a problem that the seat cushion 200 does not return to the normal seat cushion sitting posture state position 200X (see FIG. 7). In addition, the rear end portion of the seat cushion 200 may interfere with the seat back 300 and cannot be returned to the seated posture state.

For this reason, the seat cushion 200 remains in the seat cushion 200 position even when the seat cushion 200 is moved in the overturning process of returning the seat cushion 200 raised to the front side of the vehicle to the seated posture position on the vehicle body floor F again. If it is possible to easily determine whether or not the position is the flip-up state position 200Y, it is possible to prevent interference with the seat back 300 and to fall down to the normal sitting posture state position.
Therefore, as a result of intensive studies on the problem, the present inventor detects the holding state of the holding mechanism that holds the seat cushion 200 and the rotation mechanism 330, so that the posture position of the seat cushion 200 is the seat cushion flip-up state position 200Y. The focus is on easily judging whether or not.

  Thus, the present invention was devised in view of the above points, and the problem to be solved by the present invention is that the seat cushion as a seating portion can be turned upside down with respect to the vehicle body floor. With regard to the double folding mechanism of the vehicle seat having a pivoting mechanism to support, the seat cushion and the pivoting in the overturning pivoting process of returning the seat cushion raised to the front side of the vehicle to the position of the sitting posture state on the vehicle body floor again. By detecting the holding state of the holding mechanism that holds the mechanism, it is possible to easily determine whether or not the posture position of the seat cushion is the normal posture position of the seat cushion flip-up state position.

In order to achieve the above-described problems, the vehicle seat arrangement structure according to the present invention takes the following means.
According to a first aspect of the present invention, a seat that is composed of a seat cushion and a seat back and is held in a seatable posture is operated by a release means for releasing the held state, so that the seat cushion is placed on the vehicle body floor. On the other hand, the seat cushion was raised from the seat cushion sitting posture position that was lying down to the seat cushion retracted posture position standing up with respect to the vehicle body floor, and the seat back was brought down into the seat cushion installation space before the seat cushion was raised A double folding mechanism for a vehicle seat that operates to a seat back retracted posture state position, wherein the seat cushion can be rotated up and down between the seat cushion sitting posture state position and the seat cushion retracted posture state position. A rotating mechanism is provided between the seat cushion and the vehicle body floor. The rotating mechanism includes a connecting link member that connects the seat cushion and the vehicle body floor, and the rotation of the seat cushion and the vehicle body floor at one end and the other end of the connecting link member. The connection is pivotally supported so that it can be pivoted up and down, and the seat cushion supported by the pivoting mechanism is in a state where the front end of the seat cushion is lifted to the vehicle upper side with respect to the vehicle body floor. A seat cushion seating posture state having a biasing means for biasing the seat cushion in a rotational direction that is raised to a position and resisting the biasing force of the biasing means for the seat cushion that is rotationally biased by the biasing means; The vehicle body floor at the lower end of the seat back has a seat cushion side provided at the rear end of the seat cushion. A vehicle body floor side engaged member that engages with the combined member is installed, and the rear end portion of the seat cushion in the process of overturning from the seat cushion flip-up state position to the seat cushion sitting posture state position is the seat back. The seat cushion side engaging member provided at the rear end of the seat cushion engages with the vehicle body floor side engaged member installed at the vehicle body floor position when the seat cushion is moved into the lower end, and the seat cushion is raised. The pivot mechanism is configured to regulate the tilting rotation, and the pivot mechanism detects a holding state in which the seat cushion is held by the holding mechanism and a release state in which the holding by the seat cushion holding mechanism is released. A holding mechanism detection part that can be operated is set, and the seat cushion is located at a position close to the seat back of the seat cushion. Between a protruding position where the seat back comes into contact with the seat back in a non-rotatable manner when rotating between the seat cushion sitting posture state position and the seat cushion retracted posture state position, and a retracted position where the seat cushion is retractable A protruding member that operates between the holding mechanism detecting portion and the protruding member is disposed between the holding mechanism detecting portion and the protruding member by detecting the holding state by the holding mechanism detecting portion. The protruding member is connected by a mechanical transmission means such as a wire cable so that the protruding member becomes a retracted position upon detection of the released state.

According to the first aspect of the invention, the holding mechanism detection part set in the rotation mechanism detects the holding state in which the seat cushion is held by the holding mechanism and the released state in which the holding by the holding mechanism of the seat cushion is released. be able to. Further, the projecting member is configured to operate between a projecting position where the seat cushion comes into contact with the seat back so that the seat back cannot rotate and a retracted position where the seat cushion can be retracted. Further, the holding mechanism detection part and the protruding member are connected by a mechanical transmission means such as a wire cable in such a relationship that the holding position is detected by the holding mechanism detection part to be the protruding position and the protruding state is the retracted position.
If the holding mechanism is in the holding state due to unnecessary fixing between the seat cushion and the rotating mechanism in the process of pivoting from the seat cushion retracted position to the seat cushion sitting position, the protruding member becomes the protruding position. At the projecting position, the projecting member of the seat cushion interferes with the seat back, so that the seat cushion cannot be turned to the seating posture position. Thereby, it can be grasped in advance that the posture of the seat cushion with respect to the vehicle body floor is not the posture of the normal seat cushion spring-up state position in which the rear end portion of the seat cushion sinks into the lower end portion of the seat back. Further, unnecessary fixing between the seat cushion and the rotation mechanism can be prevented.
And, after the seat cushion posture is set to the posture position of the normal seat cushion spring-up state position in which the rear end portion of the seat cushion can be embedded in the lower end portion of the seat back, the seat cushion is lowered to the seat cushion seating posture state position. Can do. The seat cushion side engagement member and the vehicle body floor side engaged member can be reliably engaged at the vehicle body floor position at the lower end portion of the seat back, and the seat cushion and the vehicle body floor are fixed, and the seat cushion is turned upside down. Movement can be regulated.
As a result, the operability of the seat cushion of the double folding mechanism due to the overturning process of the double folding mechanism is further improved. Further, it is possible to prevent interference between the seat cushion and the seat back.

  The second aspect of the present invention is characterized in that the detection of the holding state and the release state by the holding mechanism detection portion is detected by a change in the posture of the seat cushion with respect to the vehicle body floor.

  According to the second aspect of the invention, the holding mechanism detection portion set in the rotation mechanism is configured to detect the seat cushion based on the posture change with respect to the vehicle body floor. As a result, the detection of the holding state and the release state of the holding mechanism can be grasped with the change in the posture of the seat cushion during the tilting rotation process from the seat cushion retracted posture state position to the seat cushion sitting posture state position. Thus, the posture of the normal seat cushion flip-up state position can be obtained.

  According to a third aspect of the present invention, there is a rotating shaft for rotating the protruding member at a position close to the seat back of the rear end portion of the seat cushion, and the rotating shaft includes an elastic member. The protruding member is normally urged in the protruding position direction by the urging force of the elastic member.

  According to the third aspect of the invention, the projecting member can be achieved by a relatively simple configuration from the rotating shaft and the elastic member. Therefore, the projecting position and the retracting position of the projecting member can be switched without a complicated configuration.

The present invention can obtain the following effects by taking the measures of the above inventions.
First, according to the double folding mechanism for a vehicle seat of the first aspect of the invention, the operability of the double folding mechanism due to the process of overturning the seat cushion is further improved. Further, it is possible to prevent interference between the seat cushion and the seat back.
Next, according to the double folding mechanism of the vehicle seat of the second aspect of the invention, the holding mechanism is moved along with the change in the posture of the seat cushion in the process of turning down from the seat cushion retracted posture state position to the seat cushion sitting posture state position. Since the detection of the holding state and the release state can be grasped, the seat cushion can be further brought into the posture of the normal seat cushion flip-up state position.
Next, according to the double folding mechanism for a vehicle seat of the third invention, the protruding position and the retracted position of the protruding member can be switched without using a complicated configuration.

The best mode for carrying out the present invention will be described below with reference to the drawings.
FIG. 1 is a side view illustrating a sitting posture state and a retracted posture state of a vehicle seat according to the present embodiment. FIG. 2 is a side view showing a state in which the seat cushion of the vehicle seat according to the present embodiment is changed from the seat cushion seating posture state position to the seat cushion spring-up state position. FIG. 3 is a side view illustrating a state in which the seat cushion of the vehicle seat according to the present embodiment is changed from the seat cushion spring-up state position to the seat cushion storage posture state position.

The vehicle seat 10 according to the present embodiment is employed as a rear seat disposed in the second or third row of the vehicle. As illustrated in FIG. 1, the vehicle seat 10 mainly includes a seat back 30 serving as a backrest portion and a seat cushion 20 serving as a seating portion. When the vehicle seat 10 is not in use, the seat cushion 20 is raised from the seat cushion seating posture state position 20X (virtual line) where the seat cushion 20 is lying down with respect to the vehicle body floor F toward the vehicle front side Fr. Then, the seat cushion is stood and rotated to the seat cushion retracted posture state position 20Z which stands up with respect to the vehicle body floor F. At the same time, the seat back 30 is brought down into the installation space P before the seat cushion 20 is raised from the seat back standing posture state position 30X (virtual line) where the seat back 30 is raised from the vehicle body floor F. The seat back retracted posture state position 30Z is configured to lie down. Thereby, the vehicle seat 10 can be stored in a compact posture state, and the space in which the vehicle seat 10 is installed can be used as the cargo space L. The operation of storing the vehicle seat 10 is performed according to the operation of the double folding mechanism 12 that connects the seat cushion 20 and the seat back 30 to the vehicle body floor F.
As shown in FIG. 1, the double folding mechanism 12 includes a seat cushion connection structure 14 that is a connection structure between the seat cushion 20 and the vehicle body floor F, and a seat back that is a connection structure between the seat back 30 and the vehicle body floor F. The connection structure 16 is used. Below, the structure of the double folding mechanism 12 is demonstrated in detail.

The seat cushion connection structure 14 of the double folding mechanism 12 will be described.
FIG. 4 is a perspective view showing the seat cushion frame 22 of the vehicle seat 10 according to the present embodiment. FIG. 5 is a perspective view showing the vehicle body floor side member 37 and the seat back frame 32 of the vehicle seat 10 according to the present embodiment. In FIG. 5, the cushion pad of the seat back 30 is not shown. Further, in order to illustrate the holding mechanism 60 provided near the center, a part of the center portion of the frame is omitted.
In general, the seat cushion connection structure 14 is configured such that the seat cushion frame 22 and the vehicle body floor side member 37 are connected by a connection link member 46 (see FIG. 1) of the rotation mechanism 40 disposed therebetween.

  As shown in FIG. 4, a seat cushion frame 22 for supporting the seat cushion 20 is shown. The figure shows the seat cushion frame 22 obliquely from above, with the upper side of the drawing sheet being the rear end portion of the seat cushion 20 and the lower side showing the front end portion. The seat cushion frame 22 is formed in a tubular wire structure, and is formed along the lower surface of the seat cushion 20 so as to support the cushion pad 23 (virtual line) of the seat cushion 20. And the seat cushion side engaging member 26 is formed in the rear-end part. In addition, a panel member 24 (virtual line) is provided substantially at the center, and the lower surface side of the seat cushion 20 is formed in a concave shape in a side view. The panel member 24 is configured to be attached with a rotation mechanism 40, a torsion spring 52 (biasing means), and a holding mechanism 60 described later.

  As shown in FIG. 4, each component of the rotation mechanism 40 is attached to the panel member 24 (virtual line) of the seat cushion frame 22. The rotation mechanism 40 is generally composed of a rotation support shaft 42, a first connection link member 46a, a second connection link member 46b (see FIG. 1), and a connection shaft 44. The rotation support shaft 42 is formed in a cylindrical shape extending in the longitudinal direction, and is transversely connected to and substantially fixed to the seat cushion frame 22 at a substantially center of the seat cushion frame 22. The connecting shaft 44 is inserted into the cylindrical inner side of the rotation support shaft 42. A lever-like first connecting link member 46a is connected to both ends of the connecting shaft 44 in parallel with each other in parallel. Thereby, the rotation support shaft 42 is rotatable at a position coaxial with the connection shaft 44. Therefore, the seat cushion frame 22 that is integrally connected and fixed to the rotation support shaft 42 can change the posture in the vehicle front-rear direction with respect to the vehicle body floor F (see FIG. 1) around the axis of the rotation support shaft 42. . That is, the rotation support shaft 42 to which the first connection link member 46a is connected is a seat cushion posture that pivotally supports the posture state of the seat cushion 20 with respect to the vehicle body floor F (see FIG. 1) in the vehicle front-rear direction. The change rotation shaft 50 is configured.

FIG. 5 shows a vehicle body floor side member 37 fixed integrally with the vehicle body floor F (see FIG. 1). The vehicle body floor side member 37 is roughly composed of a side frame 38 and reinforcing members 38a and 38b. The side frame 38 is a pair of left and right sides for supporting the seat cushion 20 (see FIG. 1) at both ends in the width direction. Is provided. The side frames 38 are rigidly joined by a plurality of reinforcing members 38a and 38b. The reinforcing member 38a disposed on the front side of the side frame 38 includes a lever-like second connecting link member 46b pivotally supported in a vehicle longitudinal direction with respect to the vehicle body floor F (see FIG. 1). A pair of left and right parts are provided in parallel with corresponding positions connectable to the first connection link member 46a (see FIG. 4). The rotation axis of the second connecting link member 46b moves the seat cushion 20 (see FIG. 1) between the seat cushion sitting posture state position 20X (see FIG. 1) and the seat cushion retracted posture state position 20Z (see FIG. 1). It is configured as a seat cushion raising / lowering pivot shaft 48 that pivots so as to be pivotable.
And the 1st connection link member 46a (refer FIG. 4) and the 2nd connection link member 46b which were comprised by the left-right pair are comprised as a connection link member 46 (refer FIG. 1). Therefore, the seat cushion frame 22 (see FIG. 4) is configured to be pivotable with respect to the vehicle body floor F (see FIG. 1) and pivotally supported.
At the substantially center position of the reinforcing member 38b disposed on the rear side of the side frame 38, the vehicle body floor side that can be engaged with the seat cushion side engaging member 26 in the seat cushion sitting posture state position 20X (see FIG. 1). An engaged member 39 is provided.

  Next, the torsion spring 52 configured as an urging means will be described. As shown in FIG. 4, the torsion spring 52 moves the seat cushion 20 (see FIG. 1) supported by the rotation mechanism 40 against the vehicle body floor F (see FIG. 1). This is for energizing the seat cushion in the flip-up position 20Y (see FIG. 2) that lifts the front end of the vehicle to the vehicle upper side. The torsion spring 52 is disposed at substantially the same position as the rotation support shaft 42 of the panel member 24 (imaginary line) of the seat cushion frame 22. The torsion spring 52 is formed so that an elastic force is generated by bending a metal bar member and receiving a torsional load in the circumferential direction around the axis of the bar. The substantially central portion of the torsion spring 52 is connected to the panel member 24 (see FIG. 1) of the seat cushion frame 22, and both end portions are disposed on the rotation track of the first connecting link member 46a. .

  As a result, the urging force of the torsion spring 52 urges the rotational urging force that is raised to the seat cushion spring-up state position 20Y (see FIG. 2) in which the front end of the seat cushion 20 (see FIG. 2) floats upward. be able to. Further, the shaft portion of the first connecting link member 46a presses both end portions of the torsion spring 52 in a direction against the urging force of the torsion spring 52, so that the seat cushion 20 (see FIG. 1) is in the seat cushion sitting posture state. The seat cushion 20 (see FIG. 1) and the turning mechanism 40 are held by the holding mechanism 60 (see FIG. 1) after being rotated to a position 20X (see FIG. 2).

Next, the holding mechanism 60 will be described. As shown in FIG. 2, the holding mechanism 60 is configured so that the seat cushion 20 urged by the torsion spring 52 (see FIG. 4) against the urging force of the torsion spring 52 (see FIG. 4). This is for holding the seating posture state position 20X. The holding mechanism 60 is generally composed of a lock claw 62, a torsion spring member 63, a striker 64, and a webbing strap 66.
The lock claw 62 is engaged with the striker 64 to hold the seat cushion 20 and the rotation mechanism 40 (see FIG. 4). The lock claw 62 is formed of a plate member, has an engaging recess 62a that engages with the striker 64, and has a tapered shape with a tapered tip. A webbing strap 66 is connected to the tip of the lock claw 62. The lock claw 62 is pivotally supported by a rotation shaft 62c at a substantially central position of the concave portion of the panel member 24 on the lower surface side of the seat cushion 20, and is disposed in a hanging shape. Further, a torsion spring member 63 is provided at the position of the rotation shaft 62c, and the lock claw 62 is normally urged clockwise in the drawing by the urging force of the torsion spring member 63, and a stopper (not shown). The rotation is restricted to a drooping position.

As shown in FIG. 4, the striker 64 is a member that is engaged with the lock claw 62 and is configured as a pair with the lock claw 62. The striker 64 is substantially U-shaped, and is joined in a state where both ends are wound around the rotation support shaft 42 of the rotation mechanism 40 at a position corresponding to the engagement position of the lock claw 62. Therefore, the striker 64 is also rotated in conjunction with the rotation of the rotation support shaft 42 accompanying the change in the posture of the seat cushion 20. In other words, the lock claw 62 is engaged with the seat cushion 20 (see FIG. 1) in conjunction with a change in the posture of the vehicle in the longitudinal direction with respect to the vehicle body floor F (see FIG. 1).
The webbing strap 66 is configured as a release lever that releases the engagement state between the lock claw 62 that is the holding mechanism 60 and the striker 64. The webbing strap 66 is formed by forming a fibrous body in a band shape. One end of the webbing strap 66 is fixed to the distal end portion of the lock claw 62, and the other end portion extends as an operation portion facing the lower surface portion of the seat cushion 20 toward the vehicle rear Re side. And a rear end portion of the seat cushion 20 so as to protrude from the vehicle front side Fr (see FIG. 1). As shown in FIG. 2, when the operation portion of the webbing strap 66 is pulled in the vehicle front side Fr direction, the lock claw 62 resists the urging force of the torsion spring member 63 and rotates toward the vehicle rear Re side. And the engagement with the striker 64 is released.
Here, the state in which the striker 64 is engaged with the engagement recess 62a of the lock claw 62 and the seat cushion 20 (see FIG. 1) is held by the rotating mechanism 40 is the holding state, and the webbing strap 66 is released. Thus, the engagement state between the lock claw 62 and the striker 64 is released, and the state in which the seat cushion 20 (see FIG. 1) is released from the holding state with the rotation mechanism 40 is set to the release state.

  As shown in FIG. 2, the double folding mechanism 12 of the vehicle seat 10 further includes the seat cushion 20 in the seat cushion seating posture state position at a position close to the seat back 30 at the rear end portion of the seat cushion 20. It operates between a projecting position 72a that makes non-rotatable contact with the seat back 30 and a retracted position 72b that can be pivotally retracted when pivoting between 20X and the seat cushion retracted state 20Z. A protruding member 72 is disposed. As well shown in FIG. 4, the rotation mechanism 40 is provided with a holding mechanism detection portion 80 that can detect the holding state and the release state of the holding mechanism 60. Then, the operation is transmitted to the projecting member 72 by a wire cable 90 provided as a mechanical transmission means so as to interlock with the holding mechanism detection portion 80. The protruding member 72 has a relationship in which the protruding member 72 is set to the protruding position 72a when the holding state is detected by the holding mechanism detecting portion 80, and the protruding member 72 is set to the retracted position 72b when the released state is detected by the holding mechanism detecting portion 80. It is connected to the wire cable 90. In addition, this wire cable 90 uses the pull type (pull type) cable conventionally used. This cable is composed of an inner cable and an outer casing, and transmits a pull.

The protruding member 72 will be described.
As shown in FIG. 4, the mounting structure of the projecting member 72 is roughly composed of a projecting member 72, a torsion spring member 74, and a bracket 75. The protruding member 72 is disposed at a position close to the seat back 30 at the rear end portion of the seat cushion 20. The protruding member 72 is formed in a substantially U shape with a tubular wire structure, both ends thereof are formed in parallel and in the same direction, and the rotation shafts 73 provided at both ends are oriented in a direction substantially parallel to the rotation support shaft 42. The bracket 75 is attached so that the entire projecting member 72 can be pivoted from the rear end portion of the seat cushion around the pivot shaft 73 in the vehicle rear side Re direction.
A torsion spring member 74 is provided between the bracket 75 and the rotation shaft 73, and the projecting member 72 is normally protruded in the vehicle rearward Re direction by the biasing force of the torsion spring member 74. It is configured to be urged to rotate to a certain protruding position 72a (see FIG. 1). As shown in FIG. 6, the state in which the projecting member 72 is located at the projecting position 72a (see FIG. 1) indicates that the seat cushion 20 is in the seat cushion sitting posture state position 20X and the seat cushion retracted posture state position 20Z. When the door is turned upside down, the seat back 30 is brought into contact with the seat back 30 so that the turning up and down is impossible.

  Further, a wire cable connection end 90 b that is one end of the wire cable 90 is connected to the protruding member 72. When the wire cable connection end 90b is connected to the projecting member 72, when the operation transmission in the pulling direction of the holding mechanism detection portion 80 described later is transmitted, the state shown in FIG. ), The projecting member 72 is urged to rotate downward in the seat cushion 20 against the urging force of the torsion spring member 74, and is urged to rotate to the retracted position 72b that is retracted to the rear end portion of the seat cushion 20. It has a configuration. As shown in FIG. 3, when the protruding member 72 is in the retracted position 72b, the seat cushion 20 is tilted between the seat cushion sitting posture state position 20X and the seat cushion retracted posture state position 20Z. It is configured to be able to turn upside down without touching the seat back 30 when turning.

Next, the holding mechanism detection part 80 will be described.
As shown in FIG. 4, the holding mechanism detection portion 80 is set in the rotation mechanism 40, and can detect the holding state and the release state of the holding mechanism 60. The detection by the holding mechanism detection part 80 is performed by detecting the posture change of the seat cushion 20 with respect to the vehicle body floor F.
In order to make this detection, it has the following configuration. As shown in FIG. 4, the holding mechanism detection part 80 is roughly composed of a bracket 47, a bracket 82, and a wire cable connection end 90 a. In the holding mechanism detection portion 80, a bracket 47 is formed at the position of the seat cushion posture changing rotation shaft 50 in the first connecting link member 46a of the rotation mechanism 40. The bracket 47 is formed in a plate shape integrally with the first connecting link member 46a, and is erected on the radial direction of the seat cushion posture changing rotation shaft 50 and on the vehicle upper side. On the vehicle rear side of the bracket 47, a bracket 82 is provided at the position of the panel member 24, and the outer casing of the wire cable 90 is fixed. The inner cable extends to the vehicle front side Fr and is connected to a substantially center position of the bracket 47 as a wire cable connection end 90a.
As shown in FIG. 2, when the seat cushion 20 is turned upside down, the posture with respect to the vehicle body floor F changes, so that the connecting link member 46 of the turning mechanism 40 is moved to the seat cushion posture changing turning shaft. Rotate around 50. Along with this, the bracket 47 simultaneously rotates in the counterclockwise direction in the drawing of FIG. As a result, the increased amount is transmitted in the pulling direction by the wire cable 90b connected to the projecting member 72, and the projecting member 72 resists the biasing force of the torsion spring member 74 from the projecting position 72a. The retraction position 72b is configured to urge the rotation.

Next, the seat back connection structure 16 of the double folding mechanism 12 will be described.
As shown in FIG. 5, the seat back coupling structure 16 includes a seat back rotation mechanism 33, a torsion spring member 35, and a reclining mechanism 36.
Specifically, the seat back turning mechanism 33 turns the vehicle body floor side member 37 fixed integrally with the vehicle body floor F, and the seat back frame 32 that forms the skeleton of the seat back 30 with respect to the vehicle body floor side member 37. A pivot shaft 33b that can be connected. Here, the seat back frame 32 is formed by rigidly joining a pipe-like member and a plate-like member, and the whole is formed in a gate shape. The vehicle body floor side member 37 and the rotation shaft 33b are provided as a pair in the width direction of the seat back 30 in order to rotatably support the lower ends of both leg portions of the seat back frame 32. Further, the gate-shaped seat back frame 32 is rigidly joined integrally with a reinforcing member 32a spanned between both leg portions, and is reinforced.

  Next, the torsion spring member 35 is disposed at a position coaxial with the rotation shaft 33b on the right side shown in FIG. Specifically, the torsion spring member 35 is disposed outside the vehicle body floor side member 37. The torsion spring member 35 is constituted by a spiral spring, and an end portion on the center side thereof is formed as a support portion 35 a attached integrally with the vehicle body floor side member 37. The outer end of the torsion spring member 35 is formed as an urging portion 35 b that is attached integrally with the seat back frame 32. Here, the seatback frame 32 is provided with a hooking member 32b for hooking the urging portion 35b. The torsion spring member 35 is assembled in a state of being pre-twisted so as to turn and urge the seat back frame 32 in the direction of tilting the vehicle body floor side member 37 toward the vehicle front side Fr. The torsion spring member 35 formed of the spiral spring is disposed at the mounting position of the rotating shaft 33b, and has a compact configuration that is torsionally deformed at the mounting position.

Next, the reclining mechanism 36 is provided between both leg portions of the seat back frame 32 and each vehicle body floor side member 37, and constitutes a connection structure thereof. The reclining mechanism 36 includes two disk-like members that are stacked on top of each other, and can be pivoted with respect to each other by a pivot shaft 36a (to be a pivot shaft 33b) provided at the center thereof. Has been. The one disk-like member is rigidly joined integrally with the seat back frame 32, and the other disk-like member is rigidly joined integrally with the vehicle body floor side member 37. Thereby, the seat back frame 32 can be rotated relative to the vehicle body floor side member 37 around the rotation shaft 36a. In addition, a locking mechanism (not shown) is incorporated in the reclining mechanism 36. The lock mechanism can be switched between a release state that allows the relative rotation and a lock state that restricts the lock mechanism by switching its operating state. Switching of the reclining mechanism 36 is performed in accordance with an operation of a reclining lever (not shown). That is, the reclining mechanism 36 is always held in a locked state in which the relative rotation is restricted before the operation of the reclining lever. And the reclining mechanism 36 is switched to the release state which permits said relative rotation by operating a reclining lever.
As well shown in FIG. 5, both reclining mechanisms 36 are connected to each other by a connecting shaft 36 b provided so as to be bridged between them. The connecting shaft 36b transmits the rotational force between the reclining mechanisms 36 in order to synchronize the operation state of the locking mechanism described above. Therefore, both the reclining mechanisms 36 are always switched synchronously according to the operation state of the reclining lever.
The configuration of the reclining mechanism 36 is known, and more detailed contents are disclosed in documents such as Japanese Patent Application Laid-Open No. 2003-979.

The operation of the double folding mechanism for a vehicle seat in the present embodiment having the above-described configuration is as follows.
First, an operation configuration for changing the vehicle seat 10 from the seating posture state to the retracted posture state will be described.
As shown in FIG. 1, the seat cushion 20 is positioned at a seat cushion sitting posture state position 20X (virtual line) where the seat cushion 20 is lying down with respect to the vehicle body floor F, and the seat back 30 is raised with respect to the vehicle body floor F. It is located in the standing posture state position 30X.
At this time, in a state where the seat cushion 20 is positioned at the seat cushion sitting posture state position 20X (imaginary line), the distance between the bracket 82 and the wire cable connection end portion 90a in the holding mechanism detection portion 80 is small. Therefore, the protruding member 72 provided at the rear end portion of the seat cushion 20 is pivoted to a protruding position 72a (see FIG. 1) which is a position protruding in the vehicle rear side Re direction by the urging force of the torsion spring member 74. It keeps being struck. In the state where the seat cushion 20 is located at the seat cushion sitting posture state position 20X (imaginary line), the seat cushion 20 is in a state where it is embedded in the lower end portion of the seat back 30, and thus the seat cushion 20 is also in the state where the protruding member 72 is positioned at the protruding position 72a There is no interference at the lower end of the back 30.
In this state, when the operation portion of the webbing strap 66 is pulled to the vehicle front side Fr, the lock claw 62 connected to the other end side of the webbing strap 66 resists the biasing force of the torsion spring member 63 in the illustration of FIG. The rotary shaft 62c is rotated in the counterclockwise direction.
As shown in FIG. 2, when the lock claw 62 is rotated counterclockwise around the rotation shaft 62c, the engagement recess 62a of the lock claw 62 and the striker 64 are disengaged. The urging force of the torsion spring 52 (see FIG. 4) provided in the seat cushion 20 works, and the seat cushion 20 is raised to the seat cushion spring-up state position 20Y in which the front end portion is lifted to the upper side of the vehicle. Be forced.
At the same time, the engagement members of the seat cushion side engagement member 26 and the vehicle body floor side engaged member 39 are moved from the engagement state at the seat cushion seating posture state position 20X to the seat cushion flip-up state position 20Y. In this position, the seat cushion side engaging member 26 moves to the vehicle front side Fr, and the engaged state of both engaging members is released. Therefore, the seat cushion 20 is in a state in which the seat cushion 20 can be rotated up and down from the seat cushion flip-up state position 20Y to the seat cushion retracted posture state position 20Z.
At this time, as shown in FIG. 2, when the seat cushion 20 is raised to the seat cushion flip-up state position 20 </ b> Y, the connecting link member 46 of the rotation mechanism 40 is centered on the seat cushion posture changing rotation shaft 50. Rotate. Along with this, the bracket 47 is simultaneously rotated in the counterclockwise direction in the drawing of FIG. 2, so that the distance between the wire cable 90a connected to the bracket 47 and the bracket 82 is increased. As a result, the increased amount becomes the operation transmission in the pulling direction by the wire cable 90b connected to the projecting member 72, and the projecting member 72 rotates from the projecting position 72a to the retracted position 72b. Yes.
As a result, the seat cushion 20 can be rotated up and down without contacting the seat back 30.
Next, as shown in FIG. 3, when the operation portion of the webbing strap 66 is further pulled to the vehicle front side Fr, the seat cushion 20 is tilted up and down around the seat cushion tilting rotation shaft 48, and the seat cushion is It rotates to the retracted posture state position 20Z.
Then, as shown in FIG. 1, the reclining mechanism 36 of the seat back 30 is released, and the seat cushion 20 is lowered into the installation space P before the seat cushion 20 is raised, and is laid down to the seat back retracted posture state position 30Z. Thereby, the vehicle seat 10 can be stored in a compact posture state, and the space in which the vehicle seat 10 is installed can be used as the cargo space L.

Next, an operation configuration for changing the vehicle seat 10 from the retracted posture state to the sitting posture state will be described.
As shown in FIG. 1, first, the seat back 30 positioned at the seat back retracted posture state position 30 </ b> Z is raised to the seat back standing posture state position 30 </ b> X (virtual line) and fixed by the reclining mechanism 36.
Next, as shown in FIG. 3, the seat cushion 20 located at the seat cushion retracted posture state position 20 </ b> Z is tilted and rotated in the vehicle rear-side Re direction around the seat cushion raising and lowering rotation shaft 48. The cushion is moved up to the cushion flip-up position 20Y. At this time, the engagement state between the lock claw 62 and the striker 64 is released until the seat cushion 20 completes the rotational movement from the seat cushion retracted posture state position 20Z to the seat cushion flip-up state position 20Y. The cushion 20 and the rotation mechanism 40 are rotated while maintaining the released state. As a result, the distance between the bracket 82 and the wire cable connection end 90 a in the holding mechanism detection portion 80 is kept large, and the protruding member 72 provided at the rear end of the seat cushion 20 resists the biasing force of the torsion spring member 74. Then, the state of being rotated and biased to the retracted position 72b that is rotated downward in the seat cushion 20 and retracted to the rear end portion of the seat cushion 20 is maintained. In a state where the projecting member 72 is located at the retracted position 72b, the seat cushion 20 is not brought into contact with the seat back 30, and the seat cushion can be turned down. Since both the engagement member of the member 26 and the vehicle body floor side engaged member 39 can be rotated to the posture position of the normal seat cushion flip-up state position 20Y that can be engaged, both the engagement members are engaged. It can be located in a possible state.
As shown in FIG. 6, temporarily, the seat cushion 20 is moved into the engagement recess 62 a of the lock claw 62 until the seat cushion 20 is completely moved from the seat cushion retracted position state position 20 </ b> Z to the seat cushion spring-up state position 20 </ b> Y. When the striker 64 is engaged and the seat cushion 20 and the rotation mechanism 40 (see FIG. 4) are held, the distance between the bracket 82 and the wire cable connection end 90a in the holding mechanism detection portion 80 is small. It becomes. Therefore, the protruding member 72 provided at the rear end portion of the seat cushion 20 is rotated and urged by the urging force of the torsion spring member 74 to the protruding position 72a that is a position protruding in the vehicle rear side Re direction. Become. Then, the projecting member 72 comes into contact with the seat back 30 so as not to be able to rotate, and the seat cushion 20 cannot be rotated to the normal seat cushion flip-up state position 20Y.
As shown in FIG. 2, after the rotational movement of the seat cushion 20 to the normal seat cushion spring-up position 20Y is completed, the urging force of the torsion spring 52 (see FIG. 4) provided in the seat cushion 20 is resisted. Then, the upper part of the seat cushion 20 is pressed downward to rotate and move so as to sink to the seat cushion sitting posture state position 20X. Then, the connecting link member 46 rotates in the clockwise direction around the seat cushion raising / lowering rotation shaft 48, and the seat cushion 20 rotates about the seat cushion posture change rotation shaft 50. The front end portion moves downward in the vehicle, and the rear end portion moves into the lower end portion of the seat back. Then, the engagement recess 62a of the lock claw 62 and the striker 64 are automatically engaged, and the seat cushion 20 and the rotation mechanism 40 (see FIG. 4) are fixed. That is, when the seat cushion 20 is pivotally moved to the seat cushion seating posture state position 20X, the striker 64 contacts the tip tapered portion of the lock claw 62 and resists the urging force of the torsion spring member 63 to lock the claw. 62 is rotated counterclockwise to engage with the engaging recess 62a. At this time, together with the engagement of the lock claw 62 and the striker 64, the seat cushion side engaging member 26 moves in the vehicle rear side Re direction and is engaged at the engagement position with the vehicle body floor side engaged member 39. To complete. At this time, the distance between the bracket 82 and the wire cable connection end 90a in the holding mechanism detection region 80 is small. Therefore, the protruding member 72 provided at the rear end portion of the seat cushion 20 is rotated and urged by the urging force of the torsion spring member 74 to the protruding position 72a that is a position protruding in the vehicle rear side Re direction. Become. As shown in FIG. 1, when the seat cushion 20 is positioned at the seat cushion sitting posture state position 20X (imaginary line), the protruding member 72 protrudes because the seat cushion 20 is in the lower end portion of the seat back 30. Even in the state positioned at the position 72a, the lower end of the seat back 30 does not interfere. Then, the seat cushion 20 and the rotation mechanism 40 (see FIG. 4) are fixed, and the seat cushion 20 can be turned to the normal seat cushion sitting posture state position 20X.

According to this configuration, the holding mechanism detection part 80 set in the rotation mechanism 40 includes a holding state in which the seat cushion 20 is held by the holding mechanism 60 and a released state in which the holding of the seat cushion 20 by the holding mechanism 60 is released. Can be detected. Further, when the seat cushion 20 is rotated up and down, the projecting member 72 operates between a projecting position 72a that is non-rotatably in contact with the seat back 30 and a retracted position 72b that is retractably retracted. It has become. Further, the holding mechanism 60 detection part 80 and the protruding member 72 are mechanical transmission means such as a wire cable 90 in such a relationship that the holding position is detected by the holding mechanism detection part 80 when the holding state is detected, and the protruding position 72a is the retracted position 72b. Connected with.
If the holding mechanism 60 is in a holding state due to unnecessary fixing between the seat cushion 20 and the rotating mechanism 40 in the process of turning and turning from the seat cushion retracted posture state position 20Z to the seat cushion sitting posture state position 20X, the protruding member 72 is provided. Becomes the projecting position 72a, and the projecting member 72 of the seat cushion 20 interferes with the seat back 30 at the projecting position 72a, so that the seat cushion cannot be turned to the seating posture state position 20X. Thereby, it is grasped in advance that the posture of the seat cushion 20 with respect to the vehicle body floor F is not the posture of the normal seat cushion flip-up state position 20Y in which the rear end portion of the seat cushion 20 sinks into the lower end portion of the seat back 30. Can do. Further, unnecessary fixing between the seat cushion 20 and the rotation mechanism 40 can be prevented.
Then, after the seat cushion 20 is brought into the posture position of the normal seat cushion flip-up state position 20Y in which the rear end portion of the seat cushion 20 is embedded in the lower end portion of the seat back 30, the seat cushion seating posture state position 20X. You can surrender to. And in the vehicle body floor F position of the lower end part of the seat back 30, the seat cushion side engaging member 26 and the vehicle body floor side engaged member 39 can be reliably engaged, and the seat cushion 20 and the vehicle body floor F are fixed, The up and down rotation of the seat cushion 20 can be restricted.
Therefore, the operability of the seat cushion 20 of the double folding mechanism 12 due to the overturning rotation process is further improved as compared with the conventional case. Further, the interference between the seat cushion 20 and the seat back 30 can be prevented in advance.

In addition, the holding mechanism detection part 80 set in the rotation mechanism 40 is configured to detect a change in the posture of the seat cushion 20 with respect to the vehicle body floor F. As a result, the detection of the holding state and the release state of the holding mechanism 60 can be grasped in accordance with the posture change of the seat cushion 20 in the fall rotation process from the seat cushion retracted posture state position 20Z to the seat cushion sitting posture state position 20X. The cushion 20 can be further in the posture of the normal seat cushion flip-up state position 20Y.
Further, the projecting member 72 can be achieved by a relatively simple configuration from the rotating shaft 73 and the torsion spring member 74. Therefore, the projecting position of the projecting member 72 and the retracted position 72b can be switched without using a complicated configuration.

The double folding mechanism for a vehicle seat according to the present invention is not limited to the present embodiment, and various modifications, additions and deletions can be made without departing from the spirit of the present invention.
For example, in the present embodiment, the frame configuration of the tubular wire structure is shown for the seat cushion frame 22, but other configurations can also be applied. For example, it may be formed in a panel shape using a material such as a synthetic resin.

  Moreover, although the frame structure of the tubular wire structure was shown about the protrusion member 72, another structure is applicable. For example, it may be formed in a bracket shape using a material such as a synthetic resin. 4 shows an example in which the protruding member 72 is configured as a part of the rear end portion of the seat cushion 20. However, the protruding member 72 may have a shape using the entire rear end portion of the seat cushion 20. In this case, it is necessary to have a shape that does not interfere with the engagement of the seat cushion side engaging member 26 and the vehicle body floor side engaged member 39.

Moreover, although the structure arrange | positioned about the torsion spring 52 as the biasing means in the panel member 24 of the seat cushion frame 22 was shown, the application of another elastic member is also possible. For example, a structure in which a helical torsion spring member is disposed at a connecting portion between the rotation support shaft 42 and the first connecting link member 46a may be used.
Moreover, although the pull-type (pull type) wire cable 90 has been shown for the wire cable 90, a push-pull push-pull type wire cable 90 may be used. Moreover, although the structure of the wire cable 90 was demonstrated as a typical example of a mechanical transmission means, the structure transmitted by link transmission may be sufficient.

It is a side view showing the sitting posture state and retracted posture state of the vehicle seat according to the present embodiment. It is a side view showing the state where the seat cushion of the vehicular seat concerning this example changes from the seat cushion seating posture state position to the seat cushion spring-up state position. It is the side view showing the state where the seat cushion of the vehicle seat which concerns on a present Example turns into a seat cushion storing posture state position from a seat cushion springing-up state position. It is a perspective view showing the seat cushion frame of the vehicle seat which concerns on a present Example. It is the perspective view showing the vehicle body floor side member and seat back frame of the vehicle seat which concern on a present Example. The seat cushion of the vehicle seat according to the present embodiment is in the holding state due to unnecessary fixing between the seat cushion and the turning mechanism in the process of turning the seat cushion from the seat cushion storing posture state position to the seat cushion sitting posture state position. It is a side view showing the state which becomes. It is the side view showing the state from which the seat cushion of the vehicle seat in the past will be in a seat cushion raising state position from a seat cushion seating posture state position. It is the side view showing the state by which the seat cushion and the rotation mechanism were fixed by the holding mechanism before the seat cushion of the vehicle seat in the past fell down to the seat cushion seating posture state position.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Vehicle seat 12 Double folding mechanism 14 Seat cushion connection structure 16 Seat back connection structure 20 Seat cushion 20X Seat cushion seating posture state position 20Y Seat cushion flip-up state position 20Z Seat cushion storage posture state position 22 Seat cushion frame 23 Cushion pad 24 Panel member 26 Seat cushion side engaging member 30 Seat back 30X Seat back standing posture state position 30Z Seat back retracted posture state position 32 Seat back frame 32a Reinforcing member 32b Engaging member 33 Seat back rotating mechanism 33b Rotating shaft 35 Torsion spring Member 35a Support portion 35b Energizing portion 36 Reclining mechanism 36a Rotating shaft 36b Connecting shaft 37 Vehicle body floor side member 38 Side frame 38a Reinforcing member 38b Reinforcing Material 39 Car body floor side engaged member 40 Rotating mechanism 42 Rotating support shaft 44 Connecting shaft 46 Connecting link member 46a First connecting link member 46b Second connecting link member 47 Bracket 48 Seat cushion tilting rotating shaft 50 Seat cushion Posture change rotation shaft 52 Torsion spring 60 Holding mechanism 62 Lock claw 62a Engaging recess 62c Rotation shaft 63 Torsion spring member 64 Strike 66 Webbing strap 72 Projection member 72a Projection position 72b Retraction position 73 Rotation shaft 74 Torsion spring member 75 Bracket 80 Holding mechanism detection part 82 Bracket 90 Wire cable 90a Wire cable connection end 90b Wire cable connection end Fr Vehicle front side Re Vehicle rear side F Vehicle body floor L Cargo space P Installation space

Claims (3)

A seat cushion seated posture state in which the seat cushion, which is composed of a seat cushion and a seat back and is held in a seatable posture state, is lowered with respect to the vehicle body floor by an operation of a release means for releasing the held state. From the position, it is raised to the seat cushion retracted state position that stands up with respect to the vehicle body floor,
A double folding mechanism for a vehicle seat that operates to a seat back retracted posture state position in which the seat back is tilted into the installation space of the seat cushion before being raised;
A turning mechanism is provided between the seat cushion and the vehicle body floor so that the seat cushion can be turned upside down between the seat cushion sitting posture state position and the seat cushion retracted posture state position. ,
The turning mechanism includes a connecting link member that connects the seat cushion and the vehicle body floor, and the connection between the seat cushion and the vehicle body floor at one end and the other end of the connecting link member is turned upside down. It is considered to be pivotally supported,
There is an urging means for urging the seat cushion supported by the pivoting mechanism in a pivoting direction in which the seat cushion is lifted to a position where the front end of the seat cushion is lifted upward with respect to the vehicle body floor. And
A holding mechanism for holding the seat cushion rotated and urged by the urging means at the seat cushion seating posture state position against the urging force of the urging means;
A vehicle body floor side engaged member that engages with a seat cushion side engaging member provided at a rear end portion of the seat cushion is installed at a vehicle body floor position at a lower end portion of the seat back,
Provided at the rear end portion of the seat cushion when the rear end portion of the seat cushion moves into the lower end portion of the seat back in the fall rotation process from the seat cushion spring-up state position to the seat cushion sitting posture state position. The seat cushion side engaging member is configured to engage the vehicle body floor side engaged member installed at the vehicle body floor position to regulate the rotation of the seat cushion.
In the turning mechanism, a holding mechanism detection part capable of detecting a holding state in which the seat cushion is held by the holding mechanism and a released state in which the holding by the holding mechanism of the seat cushion is released is set,
When the seat cushion is in a position close to the seat back of the seat cushion, the seat cushion cannot rotate to the seat back when the seat cushion is rotated between the seat cushion sitting posture state position and the seat cushion retracting posture state position. A projecting member that operates between a projecting position that comes into contact with and a retracted position that is pivotally retracted;
The holding mechanism detection part and the protruding member are the protruding position when the holding state is detected by the holding mechanism detection part, and the protruding member is the retracted position when the release state is detected by the holding mechanism detection part. A double folding mechanism for a vehicle seat, which is connected by mechanical transmission means such as a wire cable. The double folding mechanism for a vehicle seat according to claim 1,
A double folding mechanism for a vehicle seat, wherein detection of a holding state and a release state by the holding mechanism detection portion is detected by a change in posture of a seat cushion with respect to a vehicle body floor. A double folding mechanism for a vehicle seat according to claim 2,
In the proximity position of the seat cushion rear end portion with the seat back, it has a rotation shaft for rotating the protruding member,
The rotating shaft has an elastic member,
The double folding mechanism for a vehicle seat, wherein the protruding member is normally urged toward the protruding position by the urging force of the elastic member.

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