JP6366191B2 - Vehicle tip-up seat and seat cushion holding method - Google Patents

Description

  The present invention relates to a vehicular seat in which a seat cushion is flipped up and seated with a seat back to store the seat cushion, a so-called vehicle tip-up seat and a seat cushion holding method.

  A vehicle having a seat back and a seat cushion having a rear end pivotably attached to the seat back, wherein the seat cushion is rotated (bounced up), and the seat cushion is folded and stored with the seat back and the seating surface aligned. Seats, so-called vehicle tip-up seats, are known. The tip-up seat for a vehicle is usually employed as a rear seat for a one-box vehicle or a multi-purpose vehicle that enables an extended arrangement of a luggage compartment.

  In the tip-up seat, the seat cushion can be rotated between a substantially horizontal seating position and a substantially vertical storage position (a flip-up position) that is flipped up and folded by matching the seat back and the seating surface, The locking mechanism locks the seating position and the storage position.

The locking mechanism is configured to be engaged with a notch tooth formed at the end of the side frame of the seat cushion to restrict the rotation of the seat cushion.
That is, the lock mechanism includes a latch (lock lever), a cam (release lever), and an operation lever, and is provided on the side frame of the seat back. At least two notch teeth of the seat cushion are formed, both the latch and the cam are rotatable, and the operation lever is connected to the cam by a wire cable (for example, Japanese Patent Application Laid-Open No. 2007-176394).

  The latch has an engaging tooth, and the engaging tooth engages with the notch tooth of the side frame of the seat cushion. The cam has a locking end, and when the locking end is locked to the latch, the rotation of the latch is restricted, and the engagement of the latch engagement teeth and the notch teeth of the seat cushion is maintained. Is locked in the seating position, for example.

  When the operation lever is pulled, the wire cable is pulled, the cam is rotated in a direction in which the locking end is separated from the latch, the rotation restriction by the cam is released, and the latch can be rotated. Therefore, for example, when the seat cushion in the seating position is lifted, the cam rotates in the direction in which the engagement teeth are separated from the notch teeth (relief), and the engagement between the engagement teeth and the notch teeth is released and the lock is off. The seat cushion is flipped up (rotates).

  When you release your hand from the control lever, the latch rotates in the direction in which the engagement teeth and notch teeth engage, for example, by its own weight, and the seat cushion rotates while the engagement teeth contact the peripheral surface of the rear end of the side frame. To do. When the seat cushion is rotated to a position where the notch teeth of the seat cushion are opposed to the engaging teeth of the latch, the engaging teeth of the latch are engaged with the cutting teeth. Since the locking end of the cam is locked to the latch, the rotation of the latch is restricted, the engagement of the latch engagement teeth and the notch teeth of the seat cushion is maintained, and the seat cushion is retracted. Locked to.

  In Japanese Patent Application Laid-Open No. 2007-176394, three incisions are formed at the rear end of the side frame of the seat cushion and can be locked even at an intermediate position between the seating position and the storage position.

  A tip-up seat in which a holding stand is attached to the lower surface of a seat cushion is widely known (for example, Japanese Patent Application Laid-Open No. 2006-188210). The holding stand has leg portions on the left and right sides and has a substantially U shape in which the ends (lower ends) of the left and right leg portions are connected by a connecting portion. For example, the holding stand is integrally formed by bending a hollow pipe. The holding stand is attached to the lower surface of the seat cushion so that the free ends of the left and right legs are pivotable. When the seat cushion is not retracted, the holding stand stands on the floor so that the seat cushion can be seated. Hold. When the seat cushion is stored, the holding stand is folded on the lower surface of the seat cushion and stored substantially horizontally with the seat cushion.

In the tip-up seat, if the ottoman is disposed on the seat cushion, the seated person can extend the leg to the ottoman at the seat cushion seating position and take a comfortable seating posture.
The ottoman is pivotally attached to the front end of the seat cushion, and is stored below the seat cushion when not in use, and is rotated from the storage position to a position (holding position) that is substantially horizontal to the seat cushion when in use. (For example, JP, 2014-004325, A).

JP 2007-176394 A JP 2006-188210 A JP 2014-004325 A

  In the tip-up seat having the holding stand, the seating position of the seat cushion is secured by raising the holding stand on the floor and holding the seat cushion substantially horizontally. The load from the seated person applied to the seat cushion at the seating position is received by the holding stand and is not applied to the lock mechanism. Further, at the seat cushion retracted position, the load of the seat cushion is only applied to the lock mechanism, and the lock mechanism only needs to have a strength that can withstand the load of the seat cushion. Therefore, the lock mechanism is provided on one of the left and right side frames of the seat back, and the corresponding side frame of the seat cushion is rotatably connected to the other side frame of the seat back. In other words, the seat cushion is locked by the lock mechanism.

  Here, since the locking of the seat cushion by the locking mechanism is one-sided, if there is no holding stand, the locking mechanism may receive all the load from the seated person and break. Therefore, the holding stand cannot be removed from the tip-up sheet.

Even if the ottoman is provided in the tip-up seat, if the ottoman is not used at the seat cushion seating position, the ottoman is stored below the seat cushion. Here, if the ottoman is stored almost horizontally with the seat cushion on the lower surface of the seat cushion beyond the substantially vertical position below the seat cushion, it is possible to sit and pull the foot sufficiently without contacting the ottoman. A sitting posture can be obtained freely.
However, at the seat cushion seating position, the holding stand stands on the floor, and the storage position where the ottoman is sufficiently retracted below the seat cushion by the holding stand cannot be obtained. Therefore, when the ottoman is not used, the ottoman is disturbed, and the sitting posture with the legs pulled is restricted.

  Furthermore, since the holding stand is folded on the lower surface of the seat cushion and stored substantially horizontally with the seat cushion even in the seat cushion retracted position (the flip-up position), the ottoman cannot be stored on the lower surface of the seat cushion because of being obstructed by the holding stand. .

  Therefore, in a tip-up seat with an ottoman, the ottoman is usually formed separately from the seat cushion and is configured to be removable from the seat cushion. The ottoman is removed from the seat cushion when the seat cushion is tipped up (bounced up), and is attached to the seat cushion when the seat cushion is returned to the seating position. That is, it is necessary to attach and detach the ottoman corresponding to the position of the seat cushion (storage position, seating position). However, the ottoman cannot be quickly attached and detached, which impairs the convenience of the ottoman.

The ottoman is attached / detached because the holding stand exists on the lower surface of the seat cushion. If the holding stand can be removed, the ottoman can be formed integrally with the seat cushion, and the attachment / detachment becomes unnecessary.
However, in the known configuration, the lock of the seat cushion by the lock mechanism is one-sided, so if there is no holding stand, the lock mechanism may be damaged by receiving all the load from the seated person, and the seat cushion is placed in the seating position. A holding stand is indispensable for holding the unit.

An object of the present invention is to provide a vehicle tip-up seat that can hold a seat cushion in a seating position without a holding stand.
Another object of the present invention is to provide a seat cushion holding method capable of holding the seat cushion in the seating position without a holding stand.

  In the present invention, the lock mechanism is attached to the left and right sides, respectively, so that the two lock mechanisms share the load of the seated person on the left and right sides.

That is, according to the first aspect of the present invention, a seat back and a seat cushion having a rear end rotatably attached to the seat back, the seat cushion is flipped up from the seating position, and the seat back and the seating surface are provided. the vehicle tip-up seat to be stored in the storage position by folding the seat cushion in conjunction, provided with a first locking mechanism on one side of the right and left sides, the second locking mechanism on the other side remaining provided The first locking mechanism includes at least a first sector plate and a lock lever that engages with the first sector plate and restricts the rotation of the seat cushion, and the first sector plate includes the seat cushion. It has a first notch tooth corresponding to the seating position and a second notch tooth corresponding to the seat cushion storage position. The lock lever has at least first engagement teeth that selectively engage with the first and second notch teeth of the first sector plate, and the first engagement teeth are the first and second cut teeth. The first and second notch teeth of the first sector plate and the first engagement teeth of the lock lever are applied with a biasing force in a direction to engage with the notch teeth, and the seat cushion seating position, retracted Each of the positions is configured to engage in a non-rotatable manner in either the flip-up direction or the anti-bounce direction, and the second lock mechanism is engaged with the second sector plate and the second sector plate. And the second sector plate and the lock plate have second and third engagement teeth each having a single-blade shape that engage with each other only in one direction. , Second and third engaging teeth ® restricted only engage anti splashing directions of rotation to one another at the seating position of the emission, splashing directions of rotation in the seated position, thereby restricting the flip-up direction and the counterclockwise splashing directions of rotation in a retracted position The lock plate is attached so as not to rotate in the direction in which the engagement of the second and third engagement teeth is released at the seating position .
According to the ninth aspect of the present invention, the seat back and the seat cushion, the rear end of which is rotatably attached to the seat back, the seat cushion is flipped up from the seating position, and the seat back and the seating surface are provided. In the seating position in the vehicle tip-up seat for folding the seat cushion together and storing it in the storage position, and the method for holding the seat cushion in the storage position, the first locking mechanism remains on one of the left and right sides A first sector plate provided with a second locking mechanism on the other side and having a first notch tooth corresponding to the seat cushion seating position and a second notch tooth corresponding to the seat cushion seating position And at least first engaging teeth that selectively engage with the first and second notch teeth of the first sector plate, The tooth first, applied a biasing force in a direction to engage the second notch teeth, and the lock lever for restricting the rotation of the seat cushion engages the first sector plate, comprising at least The first locking mechanism restricts the rotation in both the flip-up direction and the counter-lifting direction in both the seating position and the retracted position, and the first engaging tooth and the first and second notches The seat cushion is locked by engagement with the teeth and held in the seating position and the retracted position. The second sector plate having the second engagement teeth with a single-edged shape and the second engagement teeth in only one direction A second lock mechanism having at least a third engagement tooth having a single-blade shape that engages with each other, and a lock plate that restricts the rotation of the seat cushion by the engagement of the second and third engagement teeth. The recoil-up direction at the seating position. Only the movement is restricted, the turning in the flip-up direction at the seating position, the turning-up direction in the retracted position and the turning in the anti-bounce-up direction are not restricted, and the turn is free, and by the release operation of the first lock mechanism The seat cushion can be rotated by releasing the lock of the seat cushion at the seating position and the storage position.

  In the present invention, at the seating position, the two lock mechanisms share and receive the load of the seated person applied to the seat cushion on the left and right sides, and the load of the seated person does not act on either the left or right side. Therefore, the seat cushion can be received without damaging the two locking mechanisms, and the seat cushion can be held at a substantially horizontal seating position without using a holding stand.

1 is a perspective view of a vehicle tip-up seat according to an embodiment of the present invention. The side view of the chip up seat for vehicles concerning one example of the present invention is shown. The perspective view of a seat cushion frame is shown. The disassembled perspective view of the 1st locking mechanism integrated from the outside to the left side frame of a seat cushion and a seat back is shown. The disassembled perspective view of the 2nd locking mechanism integrated in a seat cushion and the right side frame of a seat back from the outside is shown. (A) is a partially broken side view of the left side frame locked (locked on) by the first locking mechanism at the seat cushion seating position, and (B) is the first view at the seat cushion seating position. The side view of the partial fracture | rupture of the left side frame by which the lock | rock of the locking mechanism was cancelled | released (locked off) is each shown. In both (A) and (B), the cover plate of the first lock mechanism is omitted. (A) is a partially broken side view of the right side frame whose rotation is restricted by the second lock mechanism at the seat cushion seating position, and (B) is a rotation by the second lock mechanism at the seat cushion retracted position. A side view of a partially broken right side frame that is not regulated is shown. In both (A) and (B), the cover plate of the stopper mechanism is removed. (A) is a partially broken side view of the left side frame when the first lock mechanism is locked off at the seat cushion retracted position, and (B) is when the first lock mechanism is locked on at the seat cushion retracted position. The side view of a partially broken left side frame is shown. In both (A) and (B), the cover plate of the first lock mechanism is omitted. Two modifications (part C (1), part C (2)) of a part (part C) of part A in FIG.

The tip-up seat for a vehicle includes a seat back and a seat cushion whose rear end is pivotably attached to the seat back , the seat cushion is flipped up from the seating position, and the seat cushion is folded by matching the seat back and the seating surface. the vehicle tip-up seat to be stored in the storage position in, Rutotomoni provided a first locking mechanism on one side of the right and left sides, the second locking mechanism to remain other side is provided, the first locking The mechanism includes at least a first sector plate and a lock lever that engages with the first sector plate and restricts the rotation of the seat cushion, and the first sector plate corresponds to the seating position of the seat cushion. The first notch tooth and the second notch tooth corresponding to the storage position of the seat cushion have a lock lever. Has at least first engaging teeth that selectively engage with the first and second notched teeth of the first sector plate, and the first engaging teeth are the first and second notched teeth. The first and second notch teeth of the first sector plate and the first engagement teeth of the lock lever are in the seat cushion seating position and retracted position. In any case, both the flip-up direction and the anti-bounce direction are formed so as to be non-rotatably engaged, and the second lock mechanism is engaged with the second sector plate and the second sector plate. And the second sector plate and the lock plate have second and third engagement teeth each having a single-blade shape that engage with each other only in one direction. 2. The third engaging teeth are seat cushion seating Restricted only engage anti splashing directions of rotation to each other in location, splashing directions of rotation in the sitting position, without restricting the flip-up direction and the counterclockwise splashing directions of rotation in a retracted position, the lock plate Is attached so as not to rotate in the direction in which the engagement of the second and third engagement teeth is released at the seating position .

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 and 2 are a perspective view and a side view, respectively, of a vehicle tip-up seat according to an embodiment of the present invention, and FIG. 3 is a perspective view of a seat cushion frame. The front, rear, left, and right refer to the directions viewed from the driver seated on the driver seat, and are indicated by Fr, Rr, L, and R.

  As shown in FIGS. 1 and 2, a vehicular tip-up seat 10 includes a seat back 12 attached to a base member, for example, a riser 11, and a seat cushion 14 whose rear end is rotatably connected to the seat back. Are arranged on a floor (vehicle floor) 16. A headrest 12h is provided at the upper end of the seat back 12 so as to be movable up and down. An ottoman 18 is rotatably attached to the front end of the seat cushion 14.

  The ottoman 18 is positioned substantially on the same plane as the seat cushion at the seating position of the seat cushion 14, and the occupant can take a comfortable sitting posture by extending his / her legs to the ottoman at this position (holding position).

  In the embodiment, the fixed rail of the slide rail device 20, that is, the lower rail 20 Lo is bolted to the floor 16 using a bracket, and the base member (the riser 11) is disposed on the movable rail, that is, the upper rail 20 Up, and the seat 10 is configured to be movable in the front-rear direction.

  The seat back 12 and the seat cushion 14 both have a seat pad made of a foam molding material such as urethane foam on a frame (seat back frame, seat cushion frame) serving as a skeleton, and the seat pad is covered with a breathable trim cover. Each is formed to cover.

The frame of the seat cushion 14 (seat cushion frame) and the frame of the seat back 12 (seat back frame) are configured as follows, for example.
The frame (seat cushion frame) of the seat cushion 14 has a pair of left and right side frames 14S (14S-R, 14S-L), a front frame 14Fr, and a rear frame 14Rr, and the left and right side frames press steel plates. Processed and formed. In the embodiment, the front frame 14Fr and the rear frame 14Rr are both a front rod and a rear rod made of steel pipes, the front rod is at the front end of the left and right side frames 14S-R, 14S-L, and the rear rod is at the left and right side frames. Each is connected to the middle part. Therefore, the seat cushion frame is configured in a substantially rectangular shape.

The frame of the seat back 12 (seat back frame) is also configured in the same shape as the seat cushion frame.
That is, the seat back frame has a pair of left and right side frames 12S (12S-R, 12S-L), an upper frame 12Up, and a lower frame (not shown), and the left and right side frames are formed by pressing a steel plate. Is formed. For example, the upper frame 12Up and the lower frame are both an upper rod and a lower rod made of a steel pipe. The upper rod connects the upper ends of the left and right side frames 12S-R and 12S-L, and the lower rod connects the intermediate portion. The seat back frame is configured in a substantially rectangular shape.

  The riser 11 has a pair of left and right side frames 11S, and the lower ends of the left and right side frames 12S-R and 12S-L of the seat back frame are rotatably connected to the side frames of the riser.

In the embodiment, a reclining device (not shown) is provided at the lower end of the side frame of the seat back frame, and the reclining shaft 12a is installed between the pair of side frames and also serves as a pivot for the seat back.
Since the reclining device is mounted on the seat 10, the seat back 12 is set and locked at an arbitrary tilting position.

In the present invention, the seat 10 includes two lock mechanisms that restrict the rotation of the seat cushion 14 relative to the seat back 12, that is, first and second lock mechanisms 30 and 40, and the first lock mechanism is both left and right. A second lock mechanism is attached to one side of each side, and the load from the seated person is shared between the left and right sides.
In the embodiment, as shown in FIG. 3, the first lock mechanism 30 is provided on the left side of the seat 10, and the second lock mechanism 40 is provided on the right side. That is, the first locking mechanism 30 is provided between the left side frame 12S-L of the seat back and the left side frame 14S-L of the seat cushion, and the second locking mechanism 40 is provided on the right side frame of the seat back. 12S-R and the right side frame 14S-R of the seat cushion, respectively.
The first and second lock mechanisms 30 and 40 are provided on the left and right sides, and it is sufficient to receive the load from the seated person on the left and right sides. On the contrary, the first lock mechanism 30 is mounted on the seat 10. The second locking mechanism 40 may be attached to the left side of the seat, respectively.

  FIG. 4 is an exploded perspective view of a first lock mechanism incorporated from the outside into the left side frame of the seat cushion and seat back, and FIG. 5 is a second lock incorporated from the outside into the right side frame of the seat cushion and seat back. The exploded perspective view of a mechanism is shown, respectively.

First, the first lock mechanism 30 on the left side will be described. As shown in FIG. 4, the first lock mechanism 30 includes a sector plate (first sector plate) 32, a lock lever 34, a release lever 36, and a cover plate (first cover plate) 38.
For example, the sector plate 32, the lock lever 34, the release lever 36, the cover plate 38, and the left side frame 14S-L of the seat cushion are all formed by pressing.

Three attachment holes 14a1 to 14a3 are formed in the left side frame 14S-L of the seat cushion, and four attachment holes 38a1 to 38a4 are formed in the cover plate 38, respectively, and the attachment holes 14a1 and attachment holes 38a1 and attachment holes 14a2 and attachment holes are formed. 38a2, the mounting hole 14a3, and the attachment hole 38a3 are formed in aligned positions.
A shaft support hole 32 a 1 is formed in the sector plate 32, a shaft support hole 34 a is formed in the lock lever 34, and a shaft support hole 36 a is formed in the release lever 36.

The pins 31-1 threaded at both ends are inserted into the mounting holes 14a1, the sector plate shaft support holes 32a1, and the mounting holes 38a1 to the left side frame 14S-L of the seat cushion and the cover plate 38. Bolted from outside. Therefore, the sector plate 32 is supported between the left side frame 14S-L and the cover plate 38 of the seat cushion so as to be rotatable about the pin 31-1 as a rotation axis.
Similarly, pins 31-2 threaded at both ends are inserted into the mounting hole 14a2, the shaft support hole 34a of the lock lever, and the mounting hole 38a2, and the left side frame 14S-L of the seat cushion and the cover plate 38 are inserted. Bolted from the outside. Therefore, the lock lever 34 is supported between the left side frame 14S-L of the seat cushion and the cover plate 38 so as to be rotatable about the pin 31-2 as a rotation axis.
Further, pins 31-3 threaded at both ends are inserted into the mounting hole 14a3, the shaft support hole 36a of the release lever, and the mounting hole 38a3 so that the left side frame 14S-L of the seat cushion and the cover plate 38 are outside. Bolted. Therefore, the release lever 36 is rotatably supported between the left side frame 14S-L of the seat cushion and the cover plate 38 with the pin 31-3 as a rotation axis.

  The sector plate axial support hole 32a1 is formed at the lower end of the sector plate 32, and the lower end of the sector plate has an arc shape larger than the width of the sector plate with the axial support hole 32a1 as the center. Further, an insertion hole 32 a 2 is formed at the upper end of the sector plate 32, and an insertion hole 32 a 3 is formed at the center of the sector plate 32.

  Further, a plurality of notch teeth 32b, in the embodiment, two notch teeth (first and second notch teeth) 32b1 and 32b2 are formed in the arc portion at the lower end of the sector plate 32. The two notch teeth 32b1 and 32b2 are formed at positions corresponding to the seat cushion seating position and the storage position, respectively, and separated in the circumferential direction by the same angle α as the seat cushion rotation angle α (see FIG. 2). Is located. The number of notched teeth is usually two, but is not limited to two, and three or more notched teeth may be formed.

  The lock lever 34 has a substantially L-shape with two arms, and a shaft support hole 34a is formed at the center thereof. The lock lever 34 can be selectively engaged with the two notch teeth 32b1 and 32b2 of the sector plate. Teeth 34b (first engaging teeth) are formed on one arm portion of the lock lever. Further, the locking pin 34c protrudes from the lock lever.

  The release lever 36 is also substantially L-shaped with two arms, and a shaft support hole 36a is formed at the center thereof, with a hole 36b in one arm and a shaft support hole 36a in the other arm. An arcuate guide groove 36c is formed at the center. That is, the arc-shaped guide groove 36c is formed around the pin 31-3 serving as the rotation center. The locking pin 34c of the lock lever is locked in the guide groove 36c. Here, without engaging the lock lever 34, the engagement teeth 34b can be extracted from the notch teeth 32b1 and 32b2 of the sector plate (so as to be detached), and are locked in the guide groove 36c leaving a gap. A guide groove is formed in a width in which the pin 34c is locked. That is, the guide groove 36c is formed with play in the width direction.

  In the embodiment, since the release lever 36 is located on the left side of the lock lever 34, the lock pin 34c of the lock lever is provided on the left surface of the lock lever. However, the release lever 36 may be provided on the right side of the lock lever 34, and in this configuration, the locking pin 34c is provided on the right surface of the lock lever.

  As described above, the sector plate 32 is pivotally supported by the pin 31-1 and incorporated into the left side frame 14S-L of the seat cushion. Further, a lock lever 34 having engagement teeth 34b that can be engaged with the notch teeth 32b1 and 32b2 of the sector plate is pivotally supported by the pin 31-2 and incorporated into the left side frame 14S-L of the seat cushion. Further, the release lever 36 is pivotally supported by the pin 31-3 and incorporated into the left side frame 14S-L of the seat cushion. The cover plate 38 covers the lower part of the sector plate 32, the lock lever 34, and the release lever 36, and then the pins 31-1 to 31-3 are bolted to assemble the first lock mechanism 30. Therefore, the lock lever 34 and the release lever 36 are rotatably attached to the left side frame 14S-L of the seat cushion.

Next, the second lock 40 on the right side will be described. As shown in FIG. 5, the second lock mechanism 40 includes a sector plate (second sector plate) 42, a lock plate 44, and a cover plate (second cover plate) 48.
The sector plate 42, the lock plate 44, the cover plate 48, and the right side frame 14S-R of the seat cushion are all formed by press working, for example.

For example, the right side frame 14S-R of the seat cushion is formed in a substantially bilaterally symmetric shape with the left side frame 14S-L of the seat cushion, and the cover plate 48 of the second lock mechanism is the cover plate of the first lock mechanism. 38 is formed in a substantially symmetrical shape.
That is, three attachment holes 14a′1 to 14a′3 are formed in the right side frame 14S-R of the seat cushion, and four attachment holes 48a1 to 48a4 are formed in the cover plate 48, respectively. Three attachment holes 42 a 1 to 42 a 3 are formed in the sector plate 42, and two attachment holes 44 a 2 and 44 a 3 are formed in the lock plate 44. The mounting holes 14a'1 and 48a1 are aligned, the mounting holes 14a'2 and 48a2 are aligned, and the mounting holes 14a'3 and 48a3 are aligned and positioned.

  The engagement teeth (second engagement teeth) 42 b are formed on the sector plate (second sector plate) 42, and the engagement teeth (third engagement teeth) 44 b are formed on the lock plate 44. Here, the engagement teeth 42b and 44b are single-blade shapes (hook shapes) that engage only in one direction so as to allow rotation of the seat cushion in the flip-up direction and restrict rotation in the anti-bounce direction. And are provided at positions where the seat cushions 14 are engaged with each other.

  For example, the sector plate (second sector plate) 42 is formed in substantially the same shape as the sector plate (first sector plate) 32 of the first locking mechanism. That is, a shaft support hole 42a1 through which the pin 41-1 is inserted is formed at the lower end of the sector plate 42, and the lower end of the sector plate has an arc shape larger than the width of the sector plate with the shaft support hole 42a1 as the center. An insertion hole 42a2 is formed at the center of the sector plate 42, and an insertion hole 42a3 is formed at the lower end of the sector plate 42.

Then, the pins 41-1 threaded at both ends are inserted into the mounting holes 14a'1, the sector plate shaft support holes 42a1, and the mounting holes 48a2, and the right side frame 14S-R of the seat cushion, the cover plate 48 is bolted from the outside. Therefore, the sector plate 42 is supported between the right side frame 14S-R of the seat cushion and the cover plate 48 so as to be rotatable about the pin 41-1 as a rotation axis.
Similarly, pins 41-2 threaded at both ends are inserted into the mounting hole 14a'2, the lock plate insertion hole 44a2, and the mounting hole 48a1, and the right side frame 14S-R of the seat cushion, the cover plate 38 is bolted from the outside. Further, pins 41-3 threaded at both ends are inserted into the mounting hole 14a'3, the lock plate insertion hole 44a3, and the mounting hole 48a3, and the right side frame 14S-R of the seat cushion and the cover plate 48 are inserted. Bolted from the outside. Therefore, the lock plate 44 is fixed to the right side frame 14S-R of the seat cushion.

As described above, the sector plate 42 is pivotally supported by the pin 41-1 and is incorporated into the right side frame 14S-R of the seat cushion. Further, the lock plate 44 having the engagement teeth (third engagement teeth) 44b that can be engaged with the engagement teeth (second engagement teeth) 42b of the sector plate is provided by pins 41-2 and 41-3. It is incorporated into the right side frame 14S-R of the seat cushion.
The cover plate 48 covers the lower portion of the sector plate 42 and the lock plate 44, and the pins 41-1 to 41-3 are bolted to assemble the second lock mechanism 40.

  Then, the sector plate 32 of the first locking mechanism is bolted to the right side frame 12S-R of the seat back cushion, and the sector plate 42 of the second locking mechanism is bolted to the left side frame 12S-L, respectively. The back 12 and the seat cushion 14 are rotatably connected via the sector plates 32 and 42. Therefore, the seat cushion 14 is rotatable (can be flipped up) with respect to the seat back 12.

  In the embodiment, the sector plates 32 and 42 are fixed to the left and right side frames 12S-R and 12S-L of the seat back, and the first and second locking mechanisms 30 and 40 are the left and right side frames 14S-R of the seat cushion. 14S-L. However, on the contrary, the sector plates 32 and 42 are fixed to the left and right side frames 14S-R and 14S-L of the seat cushion, and the first and second locking mechanisms 30 and 40 are fixed to the left and right side frames of the seat back. It is good also as a structure incorporated in 12S-R and 12-L.

  6A is a side view of a partially broken left side frame locked (locked on) by the first locking mechanism at the seat cushion seating position, and FIG. 6B is a seat cushion seating position. FIG. 3 shows a partially broken side view of the left side frame in which the lock of the first locking mechanism is released (locked off). 6A and 6B, the cover plate of the first lock mechanism is omitted.

In FIG. 6A, a biasing force in a direction to engage the engaging teeth 34b with the notched teeth 32b1 and 32b2 of the first sector plate is applied to the lock lever 34 by a biasing means (not shown). . That is, in FIG. 6A, an urging force that rotates clockwise around the pin 31-2 that is the rotation axis is applied to the lock lever. As the biasing means, for example, a spring such as a torsion spring or a tension coil spring can be used.
If the biasing means is a torsion spring, for example, the torsion spring is wound around the pin 31-2 and one end of the torsion spring is formed on the end face of the lock lever 34 and the other end is formed on the left side frame 14S-L. The locking holes or the locking pieces are respectively locked.
If the biasing means is a tension coil spring, for example, one end of the tension coil spring is formed in a locking hole or a locking piece formed in the lock lever 34, and the other end is formed in the left side frame 14S-L. The locking holes and the locking pieces are respectively locked and stretched between the lock lever and the left side frame.

In the seating position of the seat cushion 14, the engagement teeth 34b of the lock lever face the notch teeth 32b1 on the peripheral surface of the sector plate fixed to the left side frame 12S-L of the seat back. Since a clockwise urging force is applied to the lock lever 34 around the pin 31-2, the lock lever rotates clockwise, and the engagement teeth 34b are formed on the notch teeth 32b1 on the peripheral surface of the sector plate. It enters and engages (see FIG. 6A). Here, when the engagement tooth 34b engages with the notch tooth 32b1, the notch tooth 32b1 is formed in a shape in which the engagement tooth cannot be detached in either the left or right direction. Of course, another notch tooth 32b2 is also formed in the same shape as this notch tooth 32b2, and the engaging tooth 34b is formed in a shape corresponding to the notch teeth 32b1 and 32b2. For example, the first and second cutout teeth 32b1 and 32b2 have a substantially U-shaped cross section having a bottom surface and a pair of opposing side walls, and the left and right side walls are formed substantially orthogonal to the bottom surface.
For this reason, the seat cushion 14 is restricted from rotating with respect to the sector plate 32, that is, with respect to the seat back 12 to which the sector plate 32 is fixed, in both the flip-up direction and the anti-bounce direction. It becomes immovable and locks in both directions (locked on).

  FIG. 7A is a partially cutaway side view of the right side frame whose rotation is restricted by the second lock mechanism at the seat cushion seating position, and FIG. 7B is the second view at the seat cushion retracted position. The side view of the partial fracture | rupture of the right side frame which is not rotation-controlled by a locking mechanism is shown, respectively. 7A and 7B, the cover plate of the second lock mechanism is omitted.

As shown in FIG. 7A, in the seating position of the seat cushion 14, the engagement teeth (third engagement teeth) 44b of the lock plate are fixed to the right side frame 12S-R of the seat back. Engage with engaging teeth (second engaging teeth) 42b on the peripheral surface of the sector plate. Since the lock plate 44 is fixed to the right side frame 14S-R of the seat cushion by the pins 41-2 and 41-3, the rebounding direction (clockwise around the pin 41-1 which is the rotation shaft) Direction) of the seat cushion 14 is restricted.
It is sufficient that the lock plate 44 is attached to the side frame 14S-R of the seat cushion so as not to rotate in the direction in which the engagement teeth 42b and 44b are disengaged at the seating position. If impossible, the two pins 41-2 and 41-3 may not be fixed to the side frame 14S-R. For example, the lock plate 44 is attached to the side frame 14S-R with the pin 41-3, and the two pins are protruded from the side frame with the lock plate interposed therebetween, so that the clockwise and counterclockwise directions around the pin 41-3 It is good also as a structure which prevents rotation.

As described above, at the seat cushion 14 sitting position, the left side of the seat cushion is rebounded by the engagement of the engagement teeth (first engagement teeth) 34b of the first lock mechanism 30 and the notch teeth 32b1. The rotation of the seat back 14 in the direction and the flip-up direction is restricted. On the right side, the rotation of the seat back 14 in the recoil-up direction is restricted by the engagement of the engagement teeth (second and third engagement teeth) 42b and 44b of the second stopper mechanism 40. Therefore, the rotation of the seat cushion 14 in the rebound direction is restricted on both the left and right sides, and cannot be rotated.
The rotation of the seat cushion 14 in the recoil-up direction at the seating position is regulated on both the left and right sides by the first and second lock mechanisms 30 and 40, and the lock becomes a left and right handedness. The first and second lock mechanisms 30 and 40 receive the load of the seated person applied to the seat cushion 14 on the left and right sides, and the load of the seated person does not act on both the left and right sides. Therefore, an excessive load is not applied to any one of the lock mechanisms, and the load on the seated person can be received without damaging the first and second lock mechanisms 30 and 40.
In particular, in the second lock mechanism 40, the lock plate 44 receives a load, and the lock plate is fixed to the right side frame 14S-R by two pins 41-1, 41-2. Can withstand the load and reliably receive the load.

Therefore, the first and second lock mechanisms 30 and 40 can be held by the seat cushion 14 at a substantially horizontal seating position without using a holding stand.
Since the holding stand is not used, the ottoman 18 can be configured to be retractable on the lower surface of the seat cushion substantially horizontally with the seat cushion without being obstructed by the holding stand. Therefore, it is not necessary to attach or detach the ottoman 18 according to the position of the seat cushion (sitting position, storage position), and it can be integrally attached to the front end portion of the seat cushion 14.
Further, the ottoman 18 can be stored on the lower surface of the seat cushion substantially horizontally with the seat cushion without being obstructed by the holding stand. Therefore, it is possible to sit by pulling the foot sufficiently without coming into contact with the ottoman 18, and a seating posture with the foot pulled freely can be obtained.

  The ottoman 18 is pivotally attached to the front end of the seat cushion, is stored below the seat cushion when not in use, and is rotated from a stored position to a position (holding position) that is substantially horizontal with the seat cushion when in use. Since it is easily obtained using a mechanism and is not the gist of the present invention, it is omitted.

As can be seen from FIG. 7A, on the right side, the seat cushion 14 is rotatable counterclockwise around a rotation shaft (pin) 41-1.
On the other hand, on the left side, the engagement teeth (first engagement teeth) 34b of the lock lever of the first lock mechanism 30 are either left or right with respect to the notch teeth (first notch teeth) 32b of the sector plate. Are also engaged so as not to be disengageable. Therefore, in order to allow the seat cushion 14 to be flipped up, it is necessary to switch the lock-on by the first lock mechanism 30 to the lock-off and release the engagement of the notch teeth 32b and the engagement teeth 34b. .

  In FIG. 6A, the release lever 36 is rotated clockwise around the pin 31-3 that is the rotation axis by the release operation. Then, since there is play between the release pin and the locking pin 34c in the width direction of the guide groove 36c, the lock lever 34 is rotated by an amount corresponding to the play when the locking pin is pushed against the side wall of the guide groove. By rotating counterclockwise around the pin 31-2 which is the shaft, the engagement teeth come out of the notch teeth 32b1, and the engagement between the engagement teeth and the notch teeth is released (FIG. 6B). )reference). That is, the lock by the first lock mechanism 30 is switched from lock-on to lock-off (engagement is released). When the first lock mechanism 30 is locked off, the seat cushion 14 can be rotated with respect to the seat back 12 on the left side.

  The release operation of rotating the release lever 36 in a predetermined direction to lock off the first lock mechanism 30 (releasing the engagement of the engagement teeth 34b and the notch teeth 32b1) is, for example, one arm of the release lever. This can be done easily by pulling the wire cable 36d having one end connected to the hole 36b. For example, the wire cable 36 d can be pulled from any one of the upper surface, the side surface, and the rear surface of the seat back 12. Of course, a release operation for locking off may be performed by rotating the release lever 36 in a predetermined direction by a method other than pulling the wire cable 36d.

  On the right side, the engagement of the engagement teeth 42b and 44b of the second lock mechanism is counterclockwise rotation around the rotation shaft (pin) 41-1, as can be seen from FIG. (Rotation in the flip-up direction) is not regulated. In other words, the seat cushion 14 can freely rotate in the flip-up direction, and the seat cushion 14 can also rotate in the flip-up direction with respect to the seat back 12 on the right side.

  As described above, if the first locking mechanism 30 on the left side is locked off, the second locking mechanism 40 on the right side does not restrict the rotation in the flip-up direction, and therefore the seat cushion 14 is used as the seat back 12. Can be rotated with respect to. That is, the seat cushion 14 can be flipped up only by the lock-off operation (release operation) of the first lock mechanism 30.

  When the seat cushion 14 is lifted after the first locking mechanism 30 is locked off by a release operation, the left side frame 14S-L is moved to the right side frame 14S-R as shown by an arrow in FIG. 6B. As shown in FIG. 7A, the seat cushions are rotated in synchronism, and the seat cushion is flipped up.

  FIG. 8A is a side view of a partially broken left side frame in the lock-off state of the first lock mechanism in the seat cushion retracted position, and FIG. 8B is the first lock mechanism in the seat cushion retracted position. The side view of the partial fracture | rupture of the left side frame in lock-on of each is shown. 8A and 8B, the cover plate of the first lock mechanism is removed.

  On the left side, since the urging force that urges clockwise around the pin 31-2 is applied to the lock lever 34, the engagement teeth (first engagement teeth) 34b of the lock lever are moved to the sector plate ( The seat cushion 14 is rotated while being brought into sliding contact with the peripheral surface of the first sector plate 32. Then, as shown in FIG. 8A, when the engaging tooth 34b of the lock lever reaches the notch tooth 32b2 of the sector plate, the lock lever 34 is rotated by the rotating shaft (pin 31- Turn slightly clockwise around 2). Then, as shown in FIG. 8 (B), the engaging lever 34b of the lock lever enters and engages with the notch tooth 32b2 of the sector plate, and as shown in FIG. The seat cushion 14 is stored at the matching position (storage position).

  Note that the rotation of the seat back 14 from the storage position to the seating position is performed by a release operation similar to the release operation at the seating position. That is, when the wire cable 36d is pulled in the retracted position, the engagement teeth 34b of the lock lever come out of the notch teeth 32b2 of the sector plate, the engagement of the engagement teeth and the notch teeth is released, and the seat cushion 14 is released. It can be turned in the rebounding direction (sitting position direction). Then, if the seat cushion 14 is pushed down, the seat cushion is rotated until the engagement teeth 42b and 44b of the second lock mechanism are engaged. When the engagement teeth 42b and 44b are engaged on the right side, the engagement teeth 34b of the first lock mechanism enter the notch teeth 32b1 and engage on the left side. Therefore, the seat cushion 14 is held at a substantially horizontal seating position by the first and second lock mechanisms 30 and 40.

In the configuration where the lock mechanism that restricts the rotation of the seat cushion in both the flip-up direction and the anti-bounce direction is provided on both the left and right sides, it is necessary to synchronize the release operation on both the left and right sides, making the configuration complicated To do.
On the other hand, in the present invention, the second lock mechanism 40 only regulates the rotation of the seat cushion in the recoil-up direction at the seating position, so the first lock mechanism 30 is unlocked. By simply doing this, the seat cushion can be flipped up and unlocked easily. Of course, the second locking mechanism 40 only needs to have a function of restricting the rotation of the seat cushion in the recoil-up direction at the sitting position, and is simpler in configuration and has fewer parts than the first locking mechanism 30. Can be produced at low cost.

  As shown in FIG. 8 (A) as an enlarged view of part B, a portion of the notch tooth (second notch tooth) 32b2 on the side away from the notch tooth (first notch tooth) 32b1 is shown. If the side wall 32b2 ′ is projected, the point 34b ′ of the engagement teeth of the lock lever comes into contact, and the point in time when the engagement teeth 34b of the lock lever reaches the notch teeth 32b2 of the sector plate is easily recognized. The That is, the protrusion 32b 'serves as a stopper, and the seat cushion 14 is prevented from overrun, in which the engagement tooth 34b exceeds the notch tooth 32b2 and the seat cushion 14 is flipped up, and the storage position is accurately set.

Further, as shown in FIG. 6 (A) with a part thereof enlarged as (A), of the two left and right side walls opposed to the notch teeth 32b1 of the sector plate, on the side that prevents the seat cushion from jumping up. The side wall (side wall adjacent to the notch tooth 32b2) 32b1 ′ is not substantially perpendicular to the bottom surface 32b1 of the engaging tooth, but is an inclined surface (an inclined surface that has fallen toward the engaging groove 32b2).
In this way, in the notch teeth 32b1, if the side wall 32b1 ′ on the side that prevents the seat cushion 14 from being flipped up is an inclined surface, the engagement teeth 34b can be disengaged from the notch teeth 32b1 rather than being substantially vertical. It becomes easy and the seat cushion 14 can be pulled up smoothly after the release operation.

FIG. 9 shows two modified examples (part C (1), part C (2)) of a part (part C) of part A in FIG.
In the notch tooth 32b1, the side wall (side wall adjacent to the notch tooth 32b2) 32b1 ′ is not uniformly inclined from the bottom to the top, and as shown as part C (1), the lower part 32b1′L of the side wall is shown. May be substantially perpendicular to the bottom surface 32b1 ″ of the notch teeth, and only the upper portion 32b1′U of the side wall may be a slope. Moreover, as shown as C part (2), it is good also considering the slope of side wall 32b1 'as a stepped slope with the inclination of an upper part larger than the inclination of a lower part.
As described above, if the inclination of the lower portion of the side wall 32b1 'adjacent to the notch teeth 32b2 is reduced or the lower portion is made substantially vertical, the engagement teeth 34b are lifted up to some extent from the notch teeth 32b1. The intergrated teeth are securely engaged with the notched teeth. And if it raises to some extent, the disengagement of the engagement tooth from the notch tooth becomes easy by the upper slope. That is, the two effects of the reliable engagement of the engagement tooth 34b and the notch tooth 32b1 and the easy removal of the engagement tooth from the notch tooth can be obtained simultaneously.

  As described above, in the present invention, at the seating position, the two lock mechanisms share and receive the load of the seated person applied to the seat cushion on the left and right sides, and the seated person's load does not act on either the left or right side. Therefore, the seat cushion can be received without damaging the two locking mechanisms, and the seat cushion can be held at a substantially horizontal seating position without using a holding stand.

  The above-described embodiments are for explaining the present invention, and are not intended to limit the present invention in any way, and all modifications and alterations made within the technical scope of the present invention are included in the present invention. Needless to say.

  The present invention is not limited to chip-up seats for vehicles such as buses, trains, automobiles, and airplanes, but seats used in office work (office chairs), public halls, theaters, movie theaters, sports facilities, etc. In a seat used at home, the seat cushion is flipped up and can be applied to a seat for storing the seat cushion by matching the seat back with the seating surface.

DESCRIPTION OF SYMBOLS 10 Vehicle tip-up seat 12 Seat back 12S-L, 12S-R Left and right side frame 14 Seat cushion 14S-L, 14S-R Left and right side frame 18 Ottoman 30 1st locking mechanism 32 1st sector plate (1st 1 sector plate)
32b1, 32b2 Notch teeth (first and second notch teeth)
34 lock lever 34b engaging tooth (first engaging tooth)
34c Locking pin 36 Release lever 36c Guide groove 40 Second lock mechanism 42 Sector plate (second sector plate)
42b engaging tooth (second engaging tooth)
44 Lock plate 44b Engaging tooth (third engaging tooth)

Claims (9)

A vehicle comprising a seat back and a seat cushion having a rear end pivotably attached to the seat back, the seat cushion is flipped up from the seating position, and the seat cushion is folded and stored in the storage position by matching the seat back and the seating surface. For chip up seats,
While providing a first locking mechanism on one of the left and right sides,
Provide the second locking mechanism on the other side ,
The first lock mechanism includes at least a first sector plate and a lock lever that engages with the first sector plate and restricts rotation of the seat cushion,
The first sector plate has a first notch tooth corresponding to a seat cushion seating position and a second notch tooth corresponding to a seat cushion seating position,
The lock lever has at least first engagement teeth that selectively engage with the first and second notch teeth of the first sector plate, and the first engagement teeth are the first and second cut teeth. The biasing force in the direction to engage the notch teeth is applied,
The first and second notch teeth of the first sector plate and the first engagement teeth of the lock lever are in the flip-up direction and the anti-bounce direction in both the seat cushion seating position and the storage position. In either direction, it is shaped to engage non-rotatably,
The second lock mechanism includes a second sector plate and a lock plate that engages with the second sector plate and restricts rotation of the seat cushion,
The second sector plate and the lock plate respectively have second and third engagement teeth having a single-blade shape that engage with each other only in one direction, and the second and third engagement teeth are seating positions of the seat cushion. The lock plate is engaged with each other to regulate only the rotation in the anti-bounce direction, does not restrict the rotation in the flip-up direction at the seating position, and the rotation in the flip-up direction and the anti-bounce direction at the retracted position. A tip-up seat for a vehicle that is non-rotatably attached in a direction in which the engagement of the second and third engagement teeth is released at the seating position . The seat cushion and the seat back both have a right side frame and a left side frame that are rotatably connected on the same side,
The first locking mechanism, the left and right sides either side in the seat cushion side frame is provided between the side frames of the seat back,
The first lock mechanism includes a first sector plate, a lock lever that engages with the first sector plate to restrict the rotation of the seat cushion, and a release lever that releases the engagement of the lock lever.
The first sector plate has a first notch tooth corresponding to the seat cushion seating position and a second notch tooth corresponding to the seat cushion seating position, and is fixed to the side frame of the seat back.
The release lever has an arc-shaped guide groove around the center of rotation, and is pivotally attached to the side frame of the seat cushion.
The lock lever includes a first engaging tooth that selectively engages with the first and second notched teeth of the first sector plate, and the first engaging teeth are the first and second notched teeth. Direction in which the first engagement teeth are engaged with the first and second notch teeth, having a locking pin movably locked in the guide groove of the release lever with play in a direction away from It is attached to the side frame of the seat cushion so that it can be pivoted,
The first and second notched teeth of the first sector plate and the first engaging teeth of the lock lever are in any of the seat cushion seating position, the flip-up direction at the retracted position, and the anti-bounce-up direction. Is also configured to engage non-rotatably,
The second locking mechanism is provided between the side frame of the seat cushion and the side frame of the seat back on a different side from the first locking mechanism.
The second lock mechanism includes a second sector plate and a lock plate that engages with the second sector plate and restricts rotation of the seat cushion,
The second sector plate and the lock plate have second and third engagement teeth each having a single-blade shape that engage with each other only in one direction, and the second sector plate is fixed to the side frame of the seat back, The second and third engagement teeth are engaged with each other at the seat cushion seating position to restrict only the rebound movement, and the lock plate is engaged with the second and third engagement teeth at the seating position. It is attached to the side frame of the seat cushion so that it cannot rotate in the direction of disengagement,
When the release lever is rotated under the release operation, the locking pin moves in the guide groove under play in conjunction with the rotation of the release lever, and the first engagement teeth The tip-up seat for a vehicle according to claim 1, wherein the seat cushion is released from the first notch tooth or the second notch tooth and the seat cushion is unlocked at the seating position and the retracted position. The seat cushion and the seat back both have a right side frame and a left side frame that are rotatably connected on the same side,
The first locking mechanism is provided between the side frame of the seat cushion and the side frame of the seat back on either the left or right side,
The first lock mechanism includes a first sector plate, a lock lever that engages with the first sector plate to restrict the rotation of the seat cushion, and a release lever that releases the engagement of the lock lever.
The first sector plate, the first notch and tooth corresponding to the seating position of the seat cushion has a second cutout tooth corresponding to the storage position of the seat cushion, is secured to the side frame of the seat cushion,
The release lever has an arc-shaped guide groove around the pivot center, and is pivotally attached to the side frame of the seat back.
The lock lever includes a first engaging tooth that selectively engages with the first and second notched teeth of the first sector plate, and the first engaging teeth are the first and second notched teeth. Direction in which the first engagement teeth are engaged with the first and second notch teeth, having a locking pin movably locked in the guide groove of the release lever with play in a direction away from It is attached to the side frame of the seat back so that it can be rotated,
The first and second notched teeth of the first sector plate and the first engaging teeth of the lock lever are in any of the seat cushion seating position, the flip-up direction at the retracted position, and the anti-bounce-up direction. Is also configured to engage non-rotatably,
The second locking mechanism is provided between the side frame of the seat cushion and the side frame of the seat back on a different side from the first locking mechanism.
The second lock mechanism includes a second sector plate and a lock plate that engages with the second sector plate and restricts rotation of the seat cushion,
The second sector plate and the lock plate have second and third engaging teeth each having a single-blade shape that engage with each other only in one direction, and the second sector plate is fixed to the side frame of the seat cushion, The second and third engagement teeth are engaged with each other at the seat cushion seating position to restrict only the rebound movement, and the lock plate is engaged with the second and third engagement teeth at the seating position. It is attached to the side frame of the seat back so that it cannot rotate in the direction of disengagement,
When the release lever is rotated under the release operation, the locking pin moves in the guide groove under play in conjunction with the rotation of the release lever, and the first engagement teeth The tip-up seat for a vehicle according to claim 1, wherein the seat cushion is released from the first notch tooth or the second notch tooth and the seat cushion is unlocked at the seating position and the retracted position. The first and second cutout teeth are substantially U-shaped in cross section having a bottom surface and a pair of opposing side walls,
4. The vehicle tip-up seat according to claim 2, wherein a side wall of the first notch tooth on the side adjacent to the second notch tooth is formed on an inclined surface falling in the direction of the first notch tooth.   The vehicular chip-up seat according to claim 4, wherein the slope of the side wall of the first notch tooth adjacent to the second notch tooth is a uniform slope from the bottom to the top.   The side wall of the first notch tooth on the side adjacent to the second notch tooth is formed such that a lower part of the side wall is substantially perpendicular to a bottom surface of the notch tooth and only an upper part of the side wall is formed on a slope. The vehicle tip-up seat as described.   5. The vehicle tip-up seat according to claim 4, wherein the side wall of the first notch tooth on the side adjacent to the second notch tooth is formed on a stepped slope having an upper slope larger than a lower slope.   The side wall of the 2nd notch tooth on the side away from the 1st notch tooth protrudes, and the 1st engagement tooth of a lock lever contacts and it becomes a stopper which prevents overrun of a seat cushion. The tip-up seat for vehicles according to any one of -7. A vehicle comprising a seat back and a seat cushion having a rear end pivotably attached to the seat back, the seat cushion is flipped up from the seating position, and the seat cushion is folded and stored in the storage position by matching the seat back and the seating surface. In the seat cushion holding method at the seating position and the retracted position in the tip-up seat for use,
A first locking mechanism is provided on one of the left and right sides, and a second locking mechanism is provided on the other side,
A first sector plate having a first notch tooth corresponding to a seat cushion seating position and a second notch tooth corresponding to a seat cushion seating position; and first and second of the first sector plate At least a first engaging tooth that selectively engages with the notch teeth of the first, and a biasing force in a direction to engage the first engaging teeth with the first and second notch teeth is applied, A lock lever that engages with one sector plate and restricts the rotation of the seat cushion ;
In both the seating position and the retracted position, the rotation is restricted in both the flip-up direction and the counter-lift-up direction , and the seat is engaged by the engagement between the first engagement teeth and the first and second notch teeth. Lock the cushion and hold it in the sitting position and retracted position.
A second sector plate having a second engagement tooth having a single blade shape, and a third engagement tooth having a single blade shape which engages with the second engagement tooth in only one direction; A lock plate that restricts the rotation of the seat cushion by the engagement of the engagement teeth, and at least a second lock mechanism comprising:
Only the rotation in the recoil-up direction at the seating position is restricted, the rotation in the flip-up direction at the seating position, and the turn-up direction in the storage position and the rotation in the anti-bounce-up direction are not restricted, and can be freely rotated.
A seat cushion holding method in which a seat cushion can be rotated by releasing a lock of the seat cushion at a seating position and a storage position by a release operation of a first lock mechanism.

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