JP2593105Y2 - 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 reclining device used for a seat of an automobile or the like.

[0002]

2. Description of the Related Art An example of a conventional reclining seat will be described with reference to FIG. 1 is a lower arm attached to the seat cushion side, and 2 is an upper arm attached to the seat back side. The upper arm 2 is pivotally attached to the lower arm 1 via a hinge pin 3 so as to be able to rotate in the front-rear direction. Reference numeral 4 denotes a fan-shaped ratchet plate. An arc-shaped tooth portion 4a having the same center as the hinge pin 3 is engraved on the outer peripheral portion, and is attached to the upper arm 2 by a rivet 5. Reference numeral 6 denotes a pole provided with teeth engaging with the teeth 4a of the ratchet plate 4. The pole 6 is rotatably connected to the lower arm 1 by pins 7 so as to be able to be disengaged from the teeth 4a. .

[0003] Reference numeral 8 denotes a release arm for engaging and disengaging the pawl 6, and is rotatably supported on the lower arm 1 by a pin 9. The linking structure of the release arm 8 and the pawl 6 is such that the guide pin 12 projecting from the pawl 6 is provided in the cam hole 8a of the release arm 8 by being always urged to rotate counterclockwise in FIG. The pawl 6 is rotated in the direction of disengaging (unlocking) with the ratchet plate 4 as the release arm 8 is inserted and rotated clockwise. Reference numeral 13 denotes a cam that rotates integrally with the release arm 8,
The rear surface of the pawl 6 is pressed toward the ratchet plate 4 in order to maintain a locked state in which the tooth portions of the pawl 6 mesh with the tooth portions 4a of the ratchet plate 4.

In order to make the cam 13 follow the release arm 8, a rectangular hole is formed in the release arm 8, and a convex portion that fits into the rectangular hole is formed on the cam 13 to protrude. Numeral 14 denotes a sub-plate for retaining and reinforcing each component, and 15 denotes a spiral spring for urging the upper arm 2 in a counterclockwise direction in FIG. 2, and a hook 16 fixed to the upper arm 2 and a hinge pin 3 (locking groove). 3e part).

Next, the operation of the above configuration will be described. The adjustment of the inclination angle of the seat back (upper arm 2) in the front-rear direction can be performed by disengaging the teeth of the pawl 6 and the teeth 4a of the ratchet plate 4. This can be achieved by rotating the release arm 8 clockwise in FIG. 2 and rotating the pawl 6 counterclockwise in FIG. 2 by the cooperation of the cam hole 8a and the guide pin 12.

[0006]

However, the reclining device having the above structure has a problem that the operation stroke of the release arm 8 is large.

The biasing direction of the spring 10 (arrow T in FIG. 2) and the direction of the operating force of the release arm 8 (arrow F in FIG. 2) are different. Therefore,
In the locked state, a counterclockwise urging force is acting on the release arm 8. Therefore, when the release arm 8 is rotated clockwise to shift to the unlocked state, an operation force greater than the above-described counterclockwise urging force is required, that is, there is a problem that the initial operation force is large.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a reclining device having a small operation stroke and a small initial operation force.

[0009]

According to the present invention, there is provided a lower arm fixed to a seat cushion,
An upper arm that is provided to be tiltable with respect to the lower arm via a hinge pin, a ratchet that rotates integrally with the upper arm and has a tooth portion, and a rotation center provided at a lower portion of the lower arm; A pawl having teeth formed on one side of the extending rotating end and capable of engaging with and disengaging from the teeth of the ratchet; and a rotation center provided at an intermediate portion in the height direction of the lower arm. A release plate that can be in contact with the other side of the rotating end of the pawl, and a center of rotation is provided on the upper portion of the lower arm, and one rotating end that extends in a substantially parallel direction is a handle portion; A release arm that extends to the other rotation end of the release plate that can contact the other rotation end of the release plate, one end of the release arm is locked to the lower arm, and the other end of the release plate Rectangular locked to the rotation end of the first urging one rotation end side of the release plate in a direction to disengage from the other side of the rotating end side of the pole
And one end is locked to the lower arm,
The other end is locked to the other rotating end of the release arm, the urging force is set to be larger than that of the first spring, and one rotating end of the release plate is connected to the pole via the release plate. Is pressed against the other side surface of the rotation end of the release arm, and the biasing direction is parallel to a line segment connecting the rotation center of the release arm and the contact point of the other rotation end of the release arm to the release plate. And a certain second spring.

[0010]

In the reclining device of the present invention, the release arm is rotated against the urging force of the second spring from the locked state to the unlocked state. Then, the release plate rotates in the unlocking direction, and the engagement between the teeth of the pawl and the teeth of the ratchet is released. The operation stroke can be reduced by changing the link ratio between the release plate and the release arm.

Also, the biasing direction of the second spring is set in parallel with the rotation center of the release arm and the line connecting the contact point of the other rotation end of the release arm to the release plate. The operating force can be reduced.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 1 is a block diagram of a reclining device according to an embodiment of the present invention in a locked state. In the drawing, 31 is a lower arm attached to the seat cushion side, 32 is an upper arm attached to the seat back side.
Numeral 2 is pivotally attached to the lower arm 31 via a hinge pin 33 so as to be rotatable in the front-rear direction. Reference numeral 34 denotes a ratchet plate formed in a fan shape, and an arc-shaped tooth portion 34a having the same center as the hinge pin 33 is engraved on the outer peripheral portion.
Is attached to the upper arm 32. A toothed portion 34 of the ratchet plate 34 is provided on one side of the rotating end.
is a pole provided with a tooth portion 36a that engages with the tooth portion 3a.
A pin 37 provided below the lower arm 31 is pivotally attached to the lower arm 31 so as to be able to be disengaged from the 4a.

Reference numeral 38 denotes a release plate for engaging and disengaging the pawl 36. The intermediate portion is rotatably supported by a pin 39 provided at an intermediate portion in the height direction of the lower arm 31. 40 is a lower arm 3 at one end.
1 and the other end is locked to one rotation end of the release plate 38, and the first spring always biases one rotation end of the release plate 38 clockwise in FIG. (Tension spring).

A cam hole 38a is formed at one rotation end of the release plate 38. The cam hole 38a
The guide pin 42 protruding from the pole 36 is inserted, and as the release plate 38 rotates clockwise,
Are rotated in the direction of disengaging (unlocking) with the ratchet plate 34. 43 is a release plate 38
The release plate 38 is provided at one rotation end R of the
A cam that rotates together with the pawl 36 and presses the rear surface of the pawl 36 toward the ratchet plate 34 in order to maintain a locked state in which the teeth 36a of the pawl 36 mesh with the teeth 34a of the ratchet plate 34. is there.

In order to make the cam 43 follow the release plate 38, a rectangular hole is formed in the release plate 38, and the cam 43 is formed with a protruding portion that fits into the rectangular hole. 44 is a sub-plate for retaining and reinforcing each component, and 45 is a spiral spring for urging the upper arm 32 in the counterclockwise direction in FIG. 1, and a hook 46 fixed to the upper arm 32 and a hinge pin 33 (locking groove). 3e part).

Reference numeral 51 denotes a substantially L-shaped release arm rotatably provided by using a pin 50 provided on the upper part of the lower arm 31. One rotating end of the release arm 51 extending in a substantially parallel direction is a handle portion 51a. A pin 52 that can be engaged with a groove 38 b formed in the other rotation end of the release plate 38 is formed at the other rotation end that extends below the release arm 51.

Reference numeral 53 denotes one end locked to the lower arm 31, the other end locked to the other rotating end of the release arm 51, and the biasing direction of the pin 50 which is the rotation center of the release arm 51. And a second spring (tension spring) provided at the other rotating end of the release arm 51 and parallel to a line connecting the center of the pin 52 which is a contact point with the release plate 38. The urging force of the second spring 53 is set to be larger than the urging force of the first spring 40.
The cam 43 at one rotation end of the release plate 38 is pressed against the other side surface of the rotation end of the pawl 36 via the release plate 38 against the urging force of the spring 40.

Next, the operation of the above configuration will be described. Adjustment of the inclination angle of the seat back (upper arm 32) in the front-rear direction
Tooth portion 36a of pole 36 and tooth portion 34 of ratchet plate 34
This can be done by releasing the engagement with a. This causes the handle portion 51a of the release arm 51 in the locked state to move upward against the urging force of the second spring 53. Then, the pin 52 at the other rotating end of the release arm 51 is disengaged from the groove 38a at the other rotating end of the release plate 38, and the release plate 38 is moved by the urging force of the first spring 40 as shown in FIG. This can be achieved by rotating the pawl 36 counterclockwise in FIG. 1 by the cooperation of the cam hole 38a and the guide pin 42.

According to the above configuration, the operation stroke between the locking and unlocking of the release arm 51 is such that the pin 52 at the other rotating end of the release arm 51 is moved from the groove 38 a at the other rotating end of the release plate 38. The release plate 38, the release arm 5
By changing the link ratio of 1, the operation stroke can be made much smaller than the conventional one.

The biasing direction of the second spring 53 is set to the center of the pin 50 which is the center of rotation of the release arm 51.
The initial operating force can be reduced by being parallel to a line provided at the other rotating end of the release arm 51 and connecting the center of the pin 52 which is a contact point to the release plate 38.

[0021]

As described above, according to the present invention, a reclining device having a small operation stroke and a small initial operation force can be realized.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a reclining device according to an embodiment of the present invention in a locked state.

FIG. 2 is a configuration diagram of a conventional reclining device in a locked state.

[Explanation of symbols]

 31 Lower Arm 32 Upper Arm 33 Hinge Pin 34 Ratchet 34a, 36a Teeth 36 Pole 38 Release Plate 40 First Spring 51 Release Arm 53 Second Spring

Continuation of front page (58) Field surveyed (Int.Cl. ⁶ , DB name) A47C 1/025

Claims (1)

(57) [Scope of request for utility model registration] A lower arm fixed to the seat cushion side; an upper arm provided to be tiltable with respect to the lower arm via a hinge pin; and an upper arm. And a ratchet (34) having teeth formed thereon, and a rotation center is provided at a lower portion of the lower arm (31),
A pole (36) formed on one side surface of a rotating end portion extending upward with a tooth portion capable of engaging with and disengaging from a tooth portion of the ratchet (34); and a rotation center in a height direction of the lower arm (31). A release plate (38), one rotating end of which is in contact with the other side of the rotating end of the pawl (36); and a rotation center located on the upper part of the lower arm (31). Provided,
One rotating end side extending in a substantially parallel direction is a handle portion,
A release arm (51) whose other rotating end extending downward can abut on the other rotating end of the release plate (38); one end of which is locked by the lower arm (31); A part is locked to one rotation end of the release plate (38), and one rotation end of the release plate (38) is detached from the other side of the rotation end of the pawl (36). First spring biased in the direction (40)
One end is locked to the lower arm (31), the other end is locked to the other rotating end of the release arm (51), and the biasing force is greater than that of the first spring (40). The rotation end of the release plate (38) is pressed against the other side surface of the rotation end of the pawl (36) via the release plate (38). A rotation center of the arm (51), a second spring (53) parallel to a line connecting the contact point of the other rotation end of the release arm (51) to the release plate (38). A reclining device characterized by having.