JP2539391Y2 - Seat reclining device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle seat reclining device.

[0002]

2. Description of the Related Art As a conventional seat reclining device of this type, an intermediate bracket is pivotally attached to a fixed bracket fixed to a seat cushion, and a movable bracket fixed to a seat back is pivotally attached to the intermediate bracket. Between the middle bracket and the movable bracket, and between the middle bracket and the movable bracket, There is a device provided with a forward tilt locking device that can lock and unlock the movable bracket at a regular position.

According to this seat reclining device,
By releasing the locking device for forward tilt, the seat back can be tilted forward with the pivot point at the intermediate bracket as a fulcrum, and by releasing the locking device for backward tilt, the seat back can be released. With the pivot point at the fixed bracket as a fulcrum, it can be tilted backward.

[0004]

According to the conventional seat reclining device as described above, it is possible to simultaneously release the front-rearward locking device and the rearward-reversing locking device simultaneously or in sequence. In this case, the intermediate bracket can be freely rotated with respect to the fixed bracket and the movable bracket can be freely rotated with respect to the intermediate bracket, so that the support of the seat back becomes unstable, and However, it is unpredictable in which direction the seat back will fall forward or backward, which is dangerous, and it is troublesome to return the seat back to the original normal position from such a state.

The present invention has been made in view of the above-mentioned problems of the prior art, and when either one of the forward-reversing lock device and the backward-reverse lock device is unlocked first, the other device is used. An object of the present invention is to provide a seat reclining device in which an unlocking operation is prevented.

[0006]

In order to achieve the above object, the seat reclining device of the present invention pivotally attaches an intermediate bracket to a fixed bracket fixed to a seat cushion, and the intermediate bracket is fixed to a seat back. A movable bracket is pivotally mounted, and between the fixed bracket and the intermediate bracket, a rearward locking device that can lock and unlock the intermediate bracket with respect to the fixed bracket at a regular position is provided, and the intermediate bracket and the movable bracket are provided. Between the intermediate bracket and the intermediate bracket, there is provided a forward reclining lock device capable of locking and unlocking the movable bracket at a regular position. By providing a blocking portion that prevents the unlocking operation of the , The movable bracket, by forwardly tipped seat back, is characterized in that a blocking part to prevent the unlocking of the rear 倒用 locking device.

[0007]

[Function] The rearward locking device is locked from the state where the intermediate bracket is located at the regular position with respect to the fixed bracket and the movable bracket is located at the regular position with respect to the intermediate bracket, and the seat back is held at the standing position. When the seat back is tilted rearward by the releasing operation, the blocking portion of the locking device for backward tilt prevents the unlocking operation of the locking device for forward tilt.

When the front-rear lock device is unlocked first and the seat back is tilted forward, the blocking portion of the movable bracket prevents the unlock operation of the rear-rear lock device.

Therefore, it is impossible to simultaneously release the locking operation of both the backward tilt lock device and the front tilt lock device.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the accompanying drawings.

In FIGS. 1 and 2 showing a state in which a seat back is held at a standing position, 1 is a vehicle seat, 2 is a seat cushion, and 3 is a seat back. A seat reclining device 4 is provided between a rear portion of one side of the seat cushion 2 and a lower portion of one side of the seat back 3.

The seat reclining device 4 includes a fixed bracket 5 fixed to the rear side of the cushion frame 2a of the seat cushion 2, an intermediate bracket 7 having a lower part pivotally attached to the fixed bracket 5 with a shaft 6 pointing in the left-right direction. A movable bracket 9, which is pivotally attached to an upper portion of the intermediate bracket 7 with a shaft 8 facing in the left-right direction, and is fixed to a lower portion of a side surface of a back frame 3 a of the seat back 3 (see FIG. 2); Between the intermediate bracket 7 and the movable bracket 9, which is provided between the intermediate bracket 7 and the movable bracket 9, and can lock and unlock the intermediate bracket 7 at the regular position shown in FIG. And the movable bracket 9 can be locked and unlocked at the regular position shown in FIG. A locking device 11, the entire intermediate bracket 7, and fixing bracket 5 and the movable bracket 9
And a cover 12 that covers a part of the outer surface.

The rear edge of the fixed bracket 5 has an arcuate cam surface 13 centered on the shaft 6, a concave groove 14 recessed toward the shaft 6 from the upper end thereof, and a rearward lower portion than the lower end of the cam surface 13. An extending stopper 15 is provided.

A middle portion of a lock lever 16 which faces substantially vertically is pivotally mounted on a rear middle portion of the intermediate bracket 7 with a shaft 17 which faces left and right, and the lock lever 16 is rotated by a spring (not shown). It may be biased in the direction.

A pin 1 is provided on the side of the lower end of the lock lever 16.
The pin 19 projects inward through an arc-shaped long hole 20 centered on the shaft 17, which is formed in the intermediate bracket 7. Can be disengaged. A pin 21 is provided on a side surface of an upper end portion of the lock lever 16 so as to protrude outward. The knob 18 is fixedly fitted.

Thus, the lock lever 16, the pin 19,
The rearward locking device 10 is constituted by 21 and the like.

The upper edge of the intermediate bracket 7 is provided with an arcuate cam surface 22 centered on the shaft 8 and a groove 23 recessed from the rear end toward the shaft 8.

The forward tilting lock device 11 is disposed at the rear lower portion of the movable bracket 9 with the movable bracket 9 interposed therebetween, and is pivotally mounted with a shaft 24 facing left and right, and rotates integrally with each other. A lock lever 25 and a hook lever 26 are provided. The lock lever 25 and the hook lever 26 are preferably biased counterclockwise in FIG. 1 by a spring (not shown).

At an intermediate portion of the lock lever 25, a pin 28 projecting outward is provided.
It can be engaged and disengaged with the concave groove 23 of the intermediate bracket 7, and is fitted in an arc-shaped long hole 29 centered on the shaft 24 formed in the movable bracket 9. At the tip of the lock lever 25, a rod 3 whose upper end is connected to an operation knob (not shown) provided at the upper end of the seat back 3 so as to be movable forward and backward.
0 is connected to the lower end of the lock lever 25 by pulling up the operation knob.
And the hook lever 26 can be turned upward.

The hook lever 26 has a distal end curved in a U-shape downward and rearward, and when the pin 21 of the backward locking device 10 is stopped at the position shown in FIG. 4 and can freely rotate upward together with the lock lever 25, but as shown in FIG. 4, when the lock lever 16 rotates to the unlocked position, the pin 21 fits into the curved distal end of the hook lever 26. And hook lever 2
6 and the lock lever 25 are prevented from turning upward.

At the lower end of the movable bracket 9, a protruding piece 31 is formed which extends outward and serves as a blocking portion for preventing the unlocking operation of the backward locking device 10. As shown in FIG. 1, when the seat back 3 is in the upright state, the protruding piece 31 is separated from the rotation locus of the lock lever 16 in the lock device 10 for backward movement in a forward and downward direction. Although it does not hinder the movement, as shown in FIG. 3, when the seat back 3 is tilted forward, the seat back 3 rotates around the shaft 8 and is positioned within the rotation locus of the upper half of the lock lever 16. The rotation of the lever 16 in the unlocking direction is prevented.

Next, the operation and operation procedure of this embodiment will be described.

As shown in FIG. 1, the intermediate bracket 7 and the movable bracket 9 are located at the regular positions, the locking devices 10, 11 are both locked, and the seat back 3 is held upright. When the lock lever 25 and the hook lever 26 are pivoted upward through the rod 30 by pulling up the operation knob at the upper end of the seat back 3, the pin 28
3 and the locking device 11 for forward tilt is released.

At this time, since the pin 21 in the locking device 10 for backward movement is separated from the hook lever 26, the rotation of the hook lever 26 and the lock lever 25 is
It is not hindered by

In this state, when the seat back 3 is tilted forward about the shaft 8 as shown in FIG. 3, the protruding piece 31 rotates around the shaft 8 and the upper half of the lock lever 16 is rotated. Contact or close to leading edge.

Therefore, in this state, the operating knob 18 of the backward-moving lock device 10 is operated to operate the lock lever 16.
Is rotated in the unlocking direction (counterclockwise direction in FIG. 3), the locking member 10 cannot be unlocked because the protruding piece 31 prevents the rotation.

When the seat back 3 is raised rearward from the state shown in FIG. 3, the pin 28 slides while being pressed by the cam surface 22 of the intermediate bracket 7, and the seat back 3 is moved downward as shown in FIG.
Is reached, the pin 28 is fitted into the groove 23 of the intermediate bracket 7, and the seat back 3 is held in the original standing state.

From the state shown in FIG.
When the operation knob 18 is moved forward and the lock lever 16 is rotated counterclockwise, the pin 19 is disengaged from the concave groove 14 of the fixed bracket 5 and the lock device 10 for backward movement is unlocked.

At this time, since the protruding piece 31 of the movable bracket 9 is located at a position away from the rotation range of the lock lever 16, the rotation of the lock lever 16 is not hindered by the protruding piece 31.

At the same time that the pin 19 comes out of the groove 14, the pin 21 engages with the curved tip of the hook lever 26 and prevents the hook lever 26 and the lock lever 25 from turning upward.

Therefore, the pin 21 is connected to the hook lever 26
When the lock lever 25 is operated in the unlocking direction (clockwise direction in FIG. 4) by operating the operation knob of the forward tilt lock device 11 while the Since the lever 26 prevents the rotation of the lever 26, the locking device 11 cannot be unlocked.

In this state, when the seat back 3 is tilted rearward around the shaft 6 as shown in FIG.
Numeral 9 slides while being pressed by the cam surface 13 and constantly maintains the pin 21 at a position where it engages with the hook lever 26.

When the seat back 3 reaches the position shown in FIG. 4, the pin 19 contacts the stopper 15 and the seat back 3
Is stopped.

Also at this time, the pin 21 is
Therefore, the locking device 11 cannot be released while the seat back 3 is being moved backward.

When the seat back 3 is raised forward and upward from the state shown in FIG. 4, the pin 19 slides while being pressed by the cam surface 13, and when the seat back 3 reaches the position shown in FIG. The seat back 3 is fitted in the concave groove 14.
Is kept in its original standing state.

At the same time, the lock lever 16 is returned and rotated clockwise, and the pin 21 returns to the original position shown in FIG. 1. Thereafter, the locking operation of the forward tilt lock device 11 can be released. It becomes possible.

[0037]

As is apparent from the above description, according to the present invention, when one of the front-rearward locking device and the rearward-reversing locking device is unlocked first, the other unlocking operation is performed. Therefore, there is no possibility of erroneous operation such as erroneously unlocking both lock devices.

Therefore, since both the lock devices are unlocked, the support of the seat back becomes unstable, and the seat back is broken, and it is not possible to predict in which direction the seat back will fall forward or backward. This makes it difficult to return the seat back to the original state.

[Brief description of the drawings]

FIG. 1 is a side view of a main part showing a state when a seat back is raised according to an embodiment of the present invention.

FIG. 2 is a perspective view of a main part of FIG.

FIG. 3 is a side view of a main part showing a state in which the seat back is tilted forward.

FIG. 4 is a side view of a main part showing a state in which the seat back falls down.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Seat 2 Seat cushion 2a Cushion frame 3 Seat back 3a Back frame 4 Seat reclining device 5 Fixed bracket 7 Intermediate bracket 9 Movable bracket 10 Backward locking device 11 Frontward locking device 14, 23 Concave groove 15 Stopper 16 Lock lever 18 Operation knob 19, 28 pin 20, 29 slot 21 pin (blocking part) 25 lock lever 26 hook lever 30 rod 31 protruding piece (blocking part)

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References Japanese Utility Model Sho 62-87553 (JP, U) Japanese Utility Model Sho 63-133139 (JP, U) Japanese Utility Model Hei 2-112131 (JP, U)

Claims (1)

(57) [Scope of request for utility model registration] An intermediate bracket is pivotally attached to a fixed bracket fixed to a seat cushion, and a movable bracket fixed to a seat back is pivotally attached to the intermediate bracket. A fixed bracket is provided between the fixed bracket and the intermediate bracket. A rearward locking device that can lock and unlock the intermediate bracket at the regular position is provided, and the movable bracket is locked and locked at the regular position between the intermediate bracket and the movable bracket between the intermediate bracket and the movable bracket. In a seat reclining device provided with a front-reversing lock device that can be unlocked, blocking the unlocking operation of the forward-reversing lock device by preventing the seat-back from being retracted by the rear-facing lock device. And a movable bracket that allows the seat back to fall forward, thereby Seat reclining apparatus characterized in that a blocking part to prevent the click release operation.