JPH1170026A - Car seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the safety of a car seat with a reclining mechanism and with a child seat or armrests, which are stored inside the seat back, when the child seat or the armrests are used. SOLUTION: An interlock cam A62 is attached to a bracket 61 for attaching a child seat, etc., and an interlock cam B63 which interlocks with the interlock cam A62 is attached to a rotation arm 42 of this car seat. A notch 47 to store an engaging part 63a at the top of the interlock cam B63 is formed at a prescribed position on the rim of a base member 41. Therefore, the attaching bracket 61 can be rotated only when the seat back is at a prescribed reclining angle. The interlock mechanism is made to act interlocking with the rotation of the attaching bracket 61, so that the safety of the child seat can be improved when the child seat is used.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle seat in which a seat back can be tilted with respect to a seat cushion and a child seat, an armrest and the like are built in the seat back. The seat back is tiltably attached to the seat cushion via a reclining mechanism including a base member fixed to the base member and a rotating arm rotatably supported by the base member and fixed to the seat back. The present invention relates to a vehicle seat in which a child seat or an armrest mounting bracket is rotatably supported by a turning arm, and the child seat or the armrest is incorporated in a seatback.

[0002]

2. Description of the Related Art FIG. 9 shows a vehicle seat having a reclining mechanism and a center folding mechanism and having a child seat built in a seat back.
The seat back 3 is tiltably attached to the seat cushion 2 via a reclining mechanism 4, and the seat back 3 is configured to be foldable on the upper surface of the seat cushion 2 via a center folding mechanism. ,
A child seat 6 is built in the seat back 3,
As shown in the figure, the child seat 6 is folded forward and the child seat 6 is set.

Further, as shown in FIG. 10, as the reclining mechanism 4, a base member 4a is attached to the seat cushion 2, and a turning arm 4b is rotatably supported on the base member 4a. The rotating arm 4b is connected to an arm plate 5 that constitutes a center bending mechanism. That is, by operating the operation lever 4c, the locked state between the base member 4a and the rotating arm 4b is released, and then the seat back 3 is adjusted to a predetermined reclining angle, and the operation lever 4c is moved at an appropriate reclining angle. When the hand is released, the base member 4a and the rotating arm 4b are locked at that position, and the seat back 3 is locked at a predetermined reclining angle with respect to the seat cushion 2.

In addition, when securing a large amount of indoor space,
The seat back 3 can be folded forward on the upper surface of the seat cushion 2 by tilting the seat back 3 forward based on the rotation center 5 a of the arm plate 5 fixed to both sides of the seat back 3. I have.

[0005]

However, in the conventional vehicle seat 1, since the child seat 6 can be taken in and out regardless of the reclining angle of the seat back 3, for example, an improper reclining angle is required. May use the child seat 6,
In such a case, the sitting comfort is not satisfactory, and it is necessary to correct the set position again.

Further, as shown in FIG. 11, when the child seat 6 is used, the reclining mechanism 4
May be released, there is room for improvement in terms of safety or protection of the child seat 6, and when the child seat 6 is used as shown in FIG. Activate the folding mechanism,
It is also conceivable that the seat back 3 may move, which is not preferable in terms of safety or maintenance of the child seat 6.

Further, in addition to the child seat 6, it has been pointed out that a type in which a movable armrest is built in the seatback 3 may be used at an unnatural reclining angle. When the seat back 3 falls down forward due to the lock-off of the reclining mechanism 4 or the folding mechanism is erroneously operated, and the seat back 3 is folded and stored, the armrests and the like may be damaged. .

As described above, if the reclining mechanism 4 is locked off during use of the child seat 6 even in a vehicle seat of which the center folding mechanism is abolished, it is not preferable in terms of safety or maintenance of the child seat 6 and the like. A defect has been pointed out.

A vehicle seat according to the present invention is a vehicle seat that can be reclined by a reclining mechanism and that can be folded with a middle folding mechanism if desired. A child seat, an armrest and the like are provided inside a seatback. With the built-in vehicle seat, the child seat and armrest can be taken in and out only when the seatback is at a predetermined tilt angle, and the child seat and armrest can always be used in an optimal posture. It is an object of the present invention to provide a vehicle seat with an enhanced safety provided with an interlock mechanism so as not to allow a reclining lock-off operation or a middle folding operation of a seat back.

[0010]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and a vehicle seat according to claim 1 of the present invention has a base member fixed to a seat cushion, and a base member fixed to the base member. The seat back is tiltably attached to the seat cushion via a reclining mechanism that is rotatably supported and includes a pivot arm fixed to the seat back. A child seat or an armrest is attached to the pivot arm. In a vehicle seat that rotatably supports a bracket for mounting and a child seat or an armrest incorporated in a seat back, an interlock cam A is formed on the mounting bracket, and a rotating arm includes: Interlock cam B that can move forward and backward is installed on the base member side in cooperation with interlock cam A A notch for accommodating the engaging portion at the tip of the interlock cam B is set at a predetermined position on the base member at a predetermined tilt angle of the rotating arm, and a notch for mounting only at the predetermined tilt angle of the rotating arm is provided. In addition to allowing rotation of the bracket, the interlock mechanism including the interlock cams A and B is operated in cooperation with the rotation of the mounting bracket, and is rotated with respect to the base member via the interlock mechanism. The arm is locked.

Further, the vehicle seat according to claim 2 is
A seat back is tiltably attached to the seat cushion via a reclining mechanism including a base member fixed to the seat cushion and a rotating arm rotatably supported by the base member, and The seat back is configured to be foldable to a seat cushion via a center folding mechanism provided on an arm plate rotatably supported at a rotation end side and fixed to both side frames of the seat back. An interlock cam A is formed on the mounting bracket in a vehicle seat in which a child seat or an armrest mounting bracket is rotatably supported on a plate and the child seat or the armrest is incorporated in a seatback. And an interlock cam A In cooperation with the base member, an interlock cam B capable of moving forward and backward is installed, and the base member has a cutout at a predetermined position for accommodating an engaging portion at the tip of the interlock cam B at a predetermined tilt angle of the rotating arm. The interlock cams A and B are set and allow the mounting bracket or the arm plate to rotate only at a predetermined tilt angle of the rotating arm, and cooperate with the rotating operation of the mounting bracket or the arm plate. An interlock mechanism is operated, and the rotating arm is locked to the base member via the interlock mechanism.

Further, the vehicle seat according to claim 3 is
A center-bend canceling convex portion is set at a predetermined position of the interlock cam B, and the center-bend canceling convex portion is engaged when the engaging portion at the tip of the interlock cam B is engaged in the cutout portion of the base member. Is located on the movement trajectory of the center bending latch in the center bending mechanism, thereby locking the center bending mechanism.

Therefore, in the vehicle seat according to the first and second aspects, when the child seat or the armrest incorporated in the seat back is used, the mounting bracket is tilted forward, but the mounting bracket is tilted. In order to rotate the mounting bracket, the interlock cam A needs to cooperate with the interlock cam B on the rotation arm side. The interlock cam B on the side is in contact with the peripheral edge of the base member, and the condition that the interlock cam B can advance and retreat is that the interlock cam B is provided at a predetermined position on the peripheral edge of the base member at the engaging portion at the tip of the interlock cam B The notches face each other.

Further, by rotating the mounting bracket,
In order to use the child seat or the armrest, first, the rotating arm was tilted at a predetermined angle with respect to the base member using a reclining mechanism, and provided at a predetermined position of the base member with respect to the engaging portion at the tip of the interlock cam B. It is necessary to position the notches so that they face each other.

When the mounting arm is rotated forward when the rotating arm is at a predetermined recline angle, the interlock cam B follows the surface of the interlock cam A of the mounting bracket and the base member side. And the engaging portion at the tip of the interlock cam B enters the notch of the base member, and the interlock cams A and B constituting the interlock mechanism cooperate to move the mounting bracket forward. Can be defeated.

As described above, the child seat and the armrest cannot be used regardless of the tilt angle of the seat back, and the rotation of the mounting bracket, that is, the rotation of the mounting bracket only when the rotary arm is at the predetermined tilt angle. The use of child seats and armrests is allowed, and the use of child seats and armrests can always be guaranteed at the appropriate angle of the seat back.

Further, when the child seat or the armrest is used, the interlock cam B of the rotating arm is used.
The reclining operation is limited only to the range where the engaging portion at the tip of the interlock cam B moves within the notch because the engaging portion at the tip is engaged in the notch of the base member, and the reclining mechanism is unexpectedly locked off. However, the seat back does not fall forward. The interlock mechanism including the interlock cams A and B enhances the mounting strength of the rotating arm and the seat back in addition to the lock strength of the reclining mechanism.

Next, in the vehicle seat according to the third aspect, the interlock cam B is formed with a convex portion for canceling the bending, and the interlock cam B operates in cooperation with the interlock cam A, and Lock cam B
When the engaging portion of the base member enters the notch portion of the base member, the convex portion for canceling the middle fold is located on the operation path of the middle fold latch, and before the operation of the interlock mechanism, that is,
When the engaging portion of the interlock cam B is disengaged from the notch portion, the interlock cam is retracted to a position where it does not hinder the turning operation of the center folding latch. No folding is performed. Therefore, when the child seat or the armrest is used, the seat back is not accidentally folded in the middle folded state.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a vehicle seat according to the present invention will be described below with reference to the drawings. FIG. 1 is a side view of a vehicle seat showing a first embodiment of the present invention, FIG. 2 is a side view showing a mechanical part of the vehicle seat, FIG. 3 is a cross-sectional view of the mechanical part, and FIG. And FIGS. 5 and 6 are side views showing a folded state. 7 and 8 show a second embodiment of the present invention. FIG. 7 is a side view showing a stored state of the child seat, and FIG. 8 is a side view showing a used state of the child seat.

1 to 3, a vehicle seat 10 is shown.
The seat back 30 serving as a backrest is attached to a seat cushion 20 fixed to a vehicle floor via a reclining mechanism 40 and a center folding mechanism 50, and the seat back 30 is seated via the reclining mechanism 40. The seat back 30 can be adjusted to an arbitrary reclining angle with respect to the cushion 20, and the seat back 30 is folded on the upper surface side of the seat cushion 20 via the center folding mechanism 50, and the back 31 of the seat back 30 is used as a table, Alternatively, it is possible to secure a luggage loading space for loading many luggage. Furthermore, a child seat 60 is built in the seat back 30 of the vehicle seat 10, and it is an object of the present invention to protect the child seat 60 and enhance the safety of the occupant.

First, the reclining mechanism 40 installed on the vehicle seat 10 is roughly composed of a base member 41 fixed to the seat cushion 20 and a turning arm 42 rotatably supported by the base member 41. The rotation arm 42 rotatably supports the arm plate 51 of the center folding mechanism 50 on the rotation end side, and the arm plate 51 is fixed to both sides of the seat back frame of the seat back 30.

Therefore, by operating the reclining mechanism 40, the rotating arm 42 can be rotated at a predetermined tilt angle with respect to the base member 41 and can be locked and held at a predetermined locking position. Thus, the seat back 30 can be locked and held at a predetermined reclining angle.

In the present invention, the reclining mechanism 40 is not a main part, and therefore detailed description is omitted. However, in brief, a tooth inner 43 is interposed between the base member 41 and the rotating arm 42. The tooth inner 43 is controlled by a cam 44 which is rotated by an operation lever 44a. In a locked state, the internal teeth of the rotary arm 42 and the external teeth of the tooth inner 43 are engaged and held at a predetermined lock position. By rotating the cam 44 and disengaging the teeth of both the tooth inner 43 and the rotating arm 42, the reclining lock state can be released.
The seat back 30 can be tilted.

Next, a description will be given of the center folding mechanism 50. Arm plates 51 are fixed to both sides of the seat back frame of the seat back 30, and the arm plates 51 rotate at the rotation end side of the rotation arm 42. Fulcrum 51a
Is rotatably supported on the basis of. As a lock mechanism for locking the arm plate 51 to the rotating arm 42, a striker 45 is provided on the rotating arm 42, and a middle bend latch 52 engaged with the striker 45 is provided with a rotation fulcrum on the arm plate 51. The arm plate 51 is rotatably mounted on the basis of 52 a, and the arm plate 51 is locked to the rotating arm 42 by the engagement between the striker 45 and the center bending latch 52.

A center bending cam 53 corresponding to the center bending latch 52 is also rotatably mounted on the arm plate 51 based on the rotation supporting point 53a.
An operation lever 54 is provided on the side opposite to 3a. still,
A center-bend lock spring 55 is provided between the center-bend latch 52 and the center-bend cam 53. Therefore, by operating the operation lever 54, the center bending cam 53 and the center bending latch 52 are operated in cooperation, the engagement between the center bending latch 52 and the striker 45 is released, and the rotation arm 42 and the arm plate 51 are released. And to the lock-off state.

The vehicle seat 10 of the present invention is to improve the safety of the child seat 60, and is characterized by employing an interlock mechanism as a configuration for that purpose. That is, as shown in FIGS. 2 and 3, the mounting bracket 61 of the child seat 60 is rotatably supported on the rotation end side of the rotation arm 42 at the same point as the rotation fulcrum 51 a of the arm plate 51. An interlock cam A62 is formed at the lower end of the mounting bracket 61, and the interlock cam A62
Plate-shaped interlock cam B6
3 is mounted on the rotating arm 42.

The interlock cam B 63 is interlocked with an interlock cam A 62 by an unlocking spring 64.
Spring is urged in the direction of contact with the
The advancing / retreating operation is performed on the base member 41 side following the cam surface 62. A guide wall 46 for guiding the interlock cam B63 is provided on the rotating arm 42.
Also, as shown in FIGS. 5 and 6, the interlock cam B
63 is provided with a center-bend canceling convex portion 56 at a predetermined position.

On the other hand, the base member 41 of the reclining mechanism 40 is provided with a notch 47 at a predetermined position on the peripheral edge thereof, and the notch 47 engages with the engaging portion 63a at the tip of the interlock cam B63. At the same time, the interlock mechanism is locked.

The vehicle seat 10 according to the present invention includes the above-described reclining mechanism 40, center bending mechanism 50, and an interlock mechanism (composed of an interlock cam A62 and an interlock cam B63). Hereinafter, a usage mode of the child seat 60 will be described.

In order to take out the child seat 60 to the position shown in FIG. 4, the mounting bracket 61 of the child seat 60 is rotated forward. At this time, the tilt angle of the rotary arm 42 with respect to the base member 41 is problematic. Become.
That is, when the child seat 60 is in an inappropriate posture for use, the interlock cam B6
The engaging portion 63a at the three leading ends is in contact with the peripheral edge of the base member 41, does not face the notch portion 47, and the interlock cam B63 is in a non-slidable state. Interlock cam B
Since the cooperative operation with the mounting bracket 63 cannot be expected, the mounting bracket 61 cannot be rotated.

Accordingly, in order to take out the child seat 60, as shown in FIG. 2, the reclining mechanism 40 is operated by operating the reclining mechanism 40 to a position where the notch 47 of the interlock cam B63 faces the notch 47 of the base member 41. If the reclining angle of the back 30 is adjusted, and then the mounting plate 61 is rotated counterclockwise in the drawing, the interlock cams A62 and B
The mounting plate 61 rotates by the cooperative operation with 63,
The child seat 60 can be taken out.

As described above, according to the embodiment of the present invention, the turning operation of the mounting bracket 61 can be performed only when the seat back 30 is at an appropriate reclining angle, and the child seat 60 is always kept in a safe and comfortable posture. There is an advantage that can be installed.

Then, as shown in FIG. 4, when the child seat 60 is installed, the engaging portion 63a at the tip of the interlock cam B63 enters the notch 47 of the base member 41. Because the width is longer than the engagement part and some clearance is set,
The reclining operation of the reclining mechanism 40 is permitted corresponding to this clearance.

However, even if the reclining mechanism 40 is inadvertently locked off when the child seat 60 is used, the interlock cam B63 and the base member 4
1 is locked by the interlock mechanism, so that the seat back 30 does not fall forward,
Safety during use of the child seat 60 can be effectively ensured.

The base member 41 and the rotating arm 42 are firmly locked by the engagement between the outer teeth of the tooth inner 43 and the inner teeth of the rotating arm 42. In addition, an interlock mechanism is provided. Therefore, even if a large load is applied to the seat back 30, the seat back 30 does not become black and the proper posture of the seat back 30 can be stably maintained.

In the embodiment of the present invention, when the child seat 60 is used, the seat back 30 cannot be folded in the middle. That is, the interlock cam B6
3, a bent portion canceling convex portion 56 is formed at a predetermined position, the interlock cam B63 slides downward, the interlock mechanism is in a locked state, and the center bent canceling convex portion 56 is Since it is located on the rotation locus of the middle folding latch 52 in the folding mechanism 50 and the middle folding canceling convex portion 56 functions as a stopper,
When the child seat 60 is used, the seat back 30 cannot be folded in the middle, which also increases the safety of the child seat 60.

On the other hand, when the seat back 30 is folded in the middle to use the back surface 31 of the seat back 30 as a table surface, or when the seat back 30 is folded to secure a space for mounting a large load. Is
After the mounting bracket 61 is stored in the seat back 30 to release the interlock mechanism, as shown in FIG.
The tilting operation of the rotating arm 42 with respect to the base member 41 in the counterclockwise direction in FIG.
After the engaging portion 63a at the front end of the interlock cam B63 is opposed to the intermediate lock cam B63, the operation lever 54 is lifted upward, so that the center bending cam 53 presses the center bending latch 52, and the engagement between the center bending latch 52 and the striker 45 is increased. Then, the locked state between the arm plate 51 and the rotating arm 42 is released.

In this state, the arm plate 51 may be rotated counterclockwise in the figure based on the rotation fulcrum 51a, and the interlock cam B63 is pressed downward following the cam surface of the interlock cam A62. Since the engaging portion 63a at the tip of the interlock cam B63 engages with the second notch 47a of the base member 41, the arm plate 5
When the arm plate 51 is rotated and the arm plate 51 is rotated, the arm plate 51 and the seat back 30 can be folded by the cooperation of the interlock cams A62 and B63, and the seat back 3 can be folded.
A value of 0 indicates a folded state. At this time, the mounting bracket 61 is rotated integrally with the arm plate 51 and is in a state of being bent in the middle as shown in FIG.

As described above, according to the first embodiment of the present invention, regardless of the reclining angle of the seat back 30 as in the related art, the child seat 6 is
0 can not be taken out, and only when the reclining angle of the seat back 30 is at an appropriate angle can the pivoting operation of the mounting bracket 61 of the child seat 60 be enabled, so that the child seat 60 can be secured safely. It can be used comfortably, and the seat back 3 can be used when the child seat 60 is used.
There is no reclining lock-off of 0 or a broken state, and high security can be guaranteed.

Further, a movable armrest may be used instead of the child seat 60. In this case, the mounting bracket 61 may have a function of supporting the armrest. Therefore, even when a movable armrest is installed in place of the child seat 60, the armrest can be taken out only when the seatback 30 is at an appropriate reclining angle, and the reclining is locked off unexpectedly when the armrest is used. The seatback does not break and the armrest is not damaged.

The above is an embodiment in which the present invention is applied to the vehicle seat 10 having the reclining mechanism 40 and the center folding mechanism 50 and having the child seat 60 built in the seat back 30. The present invention can be applied to the vehicle seat 10 of the omitted form.

As shown in FIGS. 7 and 8, this second
In this embodiment, the turning arm 42 is fixed to both side frames of the seat back 30. When the child seat 60 is used, the turning operation of the mounting bracket 61 is performed in the same manner as in the above-described embodiment. The cooperative operation between the interlock cam A62 and the interlock cam B63 is a necessary condition, and as shown in FIG.
The rotation of the mounting bracket 61 is allowed only when the reclining angle of 0 is in an appropriate state, that is, when the engaging portion 63a at the tip of the interlock cam B63 faces the notch 47 of the base member 41.

As shown in FIG. 8, when the mounting bracket 61 is rotated to take out the child seat 60, the engaging portion 63a at the tip of the interlock cam B63 is inserted into the cutout portion 47 of the base member 41. When the child seat 60 is used, the seat back 30 does not accidentally fall forward, and the stable use of the child seat 60 is assured. The operational effect that can be achieved is the same as that of the first embodiment.

[0044]

The above is the embodiment of the vehicle seat according to the present invention. According to the first and second aspects of the present invention, the reclining angle of the seat back is set to any angle. However, it is not possible to take out the child seat or armrest, but only when the reclining angle of the seat back is at a predetermined angle, the child seat or armrest mounting bracket is allowed to rotate, so it is appropriate It is possible to use a child seat or an armrest at a reclining angle, which has an effect of being excellent in usability.

Further, according to the first and second aspects of the present invention, the interlock mechanism operates to lock the base member and the rotating arm when the child seat or the armrest is in use. Even if a large load is applied to the seat back, the rotation arm is firmly supported by the interlock mechanism, so that the seat back etc. do not have a glare and are excellent in stability, and even if the reclining mechanism is locked off. In addition, the seat back does not fall forward, so that the safety at the time of using the child seat or the armrest is excellent, and the child seat and the armrest can be prevented from being damaged.

According to the third aspect of the present invention,
When the interlock cam B is provided with a convex part for canceling the center folding, and the mounting bracket for the child seat or the armrest is stored on the seat back side, the convex part for canceling the center folding is the center folding cam of the arm plate. When using the child seat or the armrest, the center bending canceling convex portion is located on the operation locus of the center bending latch, and the center bending canceling convex portion functions as a stopper.
The state in which the seat back cannot be folded in the middle becomes impossible, so that the seat back is prevented from being folded inadvertently when the child seat or the armrest is used, and the safety is excellent.

[Brief description of the drawings]

FIG. 1 is a side view showing a first embodiment of a vehicle seat according to the present invention.

FIG. 2 is a side view of a mechanism portion of the vehicle seat according to the present invention.

FIG. 3 is a sectional view of the vehicle seat according to the present invention taken along line III-III in FIG. 2;
Line sectional view.

FIG. 4 is a side view showing a usage state of the child seat in the vehicle seat according to the present invention.

FIG. 5 is a side view showing the state of adjusting the tilt angle of the seat back in the vehicle seat according to the present invention.

FIG. 6 is a side view showing the bending operation of the vehicle seat according to the present invention.

FIG. 7 is a side view showing a second embodiment of the vehicle seat according to the present invention.

FIG. 8 is a side view showing a usage state of the child seat in the vehicle seat according to the present invention.

FIG. 9 is an external view showing a conventional vehicle seat with a built-in child seat.

FIG. 10 is a side view showing a state where a child seat is taken out of a conventional vehicle seat.

FIG. 11 is an explanatory view showing a reclining lock-off state when a child seat of a conventional vehicle seat is used.

FIG. 12 is an explanatory diagram showing a bent state of a seat back when a child seat of a conventional vehicle seat is used.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Vehicle seat 20 Seat cushion 30 Seat back 40 Reclining mechanism 41 Base member 42 Rotating arm 43 Tooth inner 44 Cam 45 Striker 46 Guide wall 47 Notch 47a Second notch 50 Middle folding mechanism 51 Arm plate 52 Middle folding latch 53 Middle bending cam 54 Operation lever 55 Lock spring 56 Middle bending canceling convex part 60 Child seat 61 Mounting bracket 62 Interlock cam A 63 Interlock cam B 63a Engaging part 64 Lock release spring

Claims (3)

[Claims] 1. A seat back comprising: a base member fixed to a seat cushion; and a pivoting arm rotatably supported by the base member and fixed to the seat back. A vehicle seat that is tiltably attached to a cushion, rotatably supports a child seat or an armrest mounting bracket on the pivot arm, and incorporates the child seat or the armrest in a seatback. An interlock cam A is formed on the bracket for use, and an interlock cam B that can move forward and backward on the base member side in cooperation with the interlock cam A is installed on the turning arm, and the turning arm is mounted on the base member. To accommodate the engaging portion at the tip of the interlock cam B at a predetermined tilt angle of A part is set at a predetermined position, and allows the mounting bracket to rotate only at a predetermined tilt angle of the rotating arm, and includes interlock cams A and B in cooperation with the rotating operation of the mounting bracket. A vehicle seat, wherein an interlock mechanism is operated, and a rotating arm is locked to a base member via the interlock mechanism. 2. A seat back is tiltably attached to a seat cushion via a reclining mechanism including a base member fixed to the seat cushion and a rotating arm rotatably supported by the base member, The seat back is configured to be foldable on a seat cushion via a center folding mechanism provided on an arm plate fixed to both side frames of the seat back and rotatably supported on the rotation end side of the rotation arm. A child seat or an armrest mounting bracket is rotatably supported on the arm plate, and the child seat or the armrest is incorporated in a seatback. The cam A is formed, and the rotating arm has an interface. In cooperation with the lock cam A, an interlock cam B capable of moving forward and backward is installed on the base member side, and the base member has a notch portion for accommodating the engaging portion at the tip of the interlock cam B at a predetermined tilt angle of the rotating arm. It is set at a predetermined location and allows the mounting bracket or arm plate to rotate only at a predetermined tilt angle of the rotating arm, and interlocks cams A, A vehicle seat, wherein an interlock mechanism made of B is operated, and a rotating arm is locked to a base member via the interlock mechanism. 3. A bent part canceling convex portion is set at a predetermined position of the interlock cam B, and when the engaging portion at the tip of the interlock cam B is engaged in the cutout portion of the base member, the middle portion is set to the middle position. 3. The center folding mechanism is locked by positioning the folding canceling projection on the operation locus of the center folding latch in the center folding mechanism.
A vehicle seat according to claim 1.