JPH0319783Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a seat reclining device in which the inclination angle of a seat back pivotally connected to a seat cushion can be adjusted.

(Prior Art) Conventionally, in this type of seat reclining device, for example, the teeth of a locking member pivotally connected to the cushion side of the seat are connected to the teeth of the lower end of an arm fixed to the seat back side of the seat. When the tooth of the locking member is removed from the tooth of the arm by operating the operating lever, the seat bag is unlocked and the seat bag can be moved to the desired position. Some are constructed so that they can be tilted to an angular position.

However, in such conventional examples, when the teeth of the locking member are removed from the teeth of the arm by operating the operating lever, the seat back of the seat is completely unlocked, so the operating lever cannot be operated while driving. When you unlock the seat back with
The seat back sometimes falls backwards all at once, making it impossible to safely adjust the angle of the seat back during driving.

(Problems to be solved by the invention) The present invention was created by focusing on these conventional problems, and is a seat reclining device that allows the angle of the seat back to be safely adjusted even when driving. is intended to provide.

(Means for solving the problem) The gist of the present invention to achieve this purpose is as follows:
In a seat reclining device in which the inclination angle of a seat back pivotally connected to a seat cushion can be adjusted, an arm fixed to the seat back side is pivotally connected to a base plate fixed to the cushion side, and the arm is fixed to the lower part of the arm. A first locking member that engages with the toothed portion of the arm to lock the swinging of the arm is biased towards the meshing position of the arm with the toothed portion of the arm, thereby finely adjusting the swinging range of the arm. A restraint mechanism for fine adjustment is provided that can be switched between a restraint position in which the restraint is restrained within a range and a restraint release position in which the restraint is released, and the restraint mechanism for fine adjustment is arranged concentrically with the pivot center of the arm. a limiting member that is swingable relative to the limiting member; a holding means that elastically holds the limiting member in a predetermined position; and a holding means that engages with teeth formed on the limiting member to lock the swinging of the limiting member. a second locking member that engages with the teeth of the limiting member; The member is urged toward the restraining position, and the first locking member is pivoted to the base plate and engages with the teeth of the arm at a first operating position from the locking position. a fine adjustment position in which the locking member is released and the second locking member is held in the locking position, and a final operating position from the locking position,
The reclining device for a seat is characterized in that it is provided with an operating lever that can be switched between two stages: a coarse adjustment position in which the engagement is released and the second locking member is switched to the restraint release position.

(Function) And, in the above-mentioned seat reclining device,
When the operation lever is operated in the first step from the locking position to the fine adjustment position, the first locking member comes off from the teeth of the arm, but the second locking member is held in the locking position. The swing range of the seat back is limited to the fine adjustment range, but when the operating lever is fully operated from the locking position to the coarse adjustment position,
The first locking member is disengaged from the teeth of the arm, and the second locking member is switched to a restraint release position in which the second locking member is disengaged from the teeth of the limiting member, and the restraint of the swinging range of the seat back of the seat is released. It's on.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

1 to 6 show an embodiment of the present invention.

As shown in FIG. 2, the seat reclining device 1 has a seat back 2b pivotally supported on a cushion 2a of the seat 2, and supports the seat back 2b so that the inclination angle of the seat back 2b can be adjusted.

As shown in FIGS. 1 to 4, the cushion 2
A base plate 3 is fixed to the seat back 2b, and an arm 4 is fixed to the seat back 2b. The arm 4 is pivotally connected to the base plate 3 by a pivot 4a, thereby allowing the seat back 2b to
is pivotably supported on the cushion 2a.

A toothed portion 4c is formed at the lower part of the arm 4, and a first locking member 5 that engages with the toothed portion 4c to lock the swinging of the arm 4 is attached to the base plate 3 with a pin 6.
It is supported by This first locking member 5 is formed with a toothed portion 5a that meshes with the toothed portion 4c of the arm 4. The first locking member 5 is urged by a spring 5c toward a meshing position where the teeth 5a mesh with the teeth 4c.

An operating lever 7 for unlocking the seat bag 2b is pivotally connected to the base plate 3 by a pin 8. As shown in FIG. 3, the operating lever 7 is provided with engagement pins 7a and 7b projecting from the operating lever 7 for transmitting the swinging operation of the operating lever 7 to the first locking member 5. As shown in FIG.

A limiting plate 9, which is a limiting member, is rotatably supported on the pivot shaft 4a of the arm 4. This restriction plate 9 has an arc-shaped elongated hole 9a, and an engagement pin 4b protruding from the arm 4 is inserted into the elongated hole 9a. An engaging pin 4b is provided in the elongated hole 9a.
As shown in FIG. 3, a pair of springs 10a and 10b are arranged to pinch and hold the limiting plate 9 in a neutral position.

Engagement pin 4b, long hole 9a and pair of springs 10
A and 10b constitute a holding means.

A second locking lever 11, which is a second locking member that engages with the teeth 9b of the restriction plate 9 and locks the restriction plate 9, is pivoted to the base plate 3 together with the first locking member 5 by the pin 6. supported. This second locking lever 11 has a toothed portion 1 that meshes with the toothed portion 9b of the restriction plate 9.
1a is formed, and an arcuate long hole 11b extending in the swinging direction is formed. This long hole 1
1b includes an engaging pin 5 protruding from the first locking member 5.
b is inserted. In addition, the second locking lever 11
is biased by a spring 12 in a direction in which the tooth portion 11a meshes with the tooth portion 9b.

The positional relationship between the first locking member 5 and the second locking lever 11 is as shown in FIG.
When the is in the locking position, the engagement pin 5b is in contact with the upper end of the elongated hole 11b, and the operating lever 7 is moved from the locking position to the first operating position, the fine adjustment position ( Until the locking pin 5b is operated to the position shown in FIG. 11.

The restriction plate 9, the pair of springs 10a, 10b, the second locking lever 11, and the spring 12 restrict the swing range of the arm 4 to a fine adjustment range, and the restriction release position releases the restriction. The restraint mechanism 20 is configured to be able to switch between the two positions and to be biased toward the restraint position.

The operating lever 7 is connected to the toothed portion 5 of the first locking member 5.
At the first operating position from the locking position (the position shown in FIG. 3) where the arm 4 is locked by meshing the arm 4 with the teeth 4c of the arm 4, the locking mechanism 20 is released from the locking position and the locking mechanism 20 At the fine adjustment position (the position shown in FIGS. 4 and 5) in which the locking mechanism 20 is held at the locking position, and at the final operating position from the locking position, the engagement is released and the locking mechanism 20 is moved to the lock release position. It is possible to switch to the coarse adjustment position (the position shown in FIG. 6) and the coarse adjustment position (position shown in FIG. 6).

The action will be explained below.

When the operating lever 7 of the seat reclining device 1 is in the locking position shown in FIGS. 2 and 3, the teeth 5a of the first locking lever 5 mesh with the teeth 4c of the arm 4, and the arm 4 The tooth portion 11a of the second locking lever 11 engages with the tooth portion 9b of the restriction plate 9 to lock the restriction plate 9. In this state, seat back 2 of seat 2
b is locked at the position shown by the solid line in FIG. 2, and its tilting is prevented.

If it is desired to adjust the angle of the seat back 2b, the operating lever 7 can be pulled up from the locking position.

When you want to finely adjust the angle of the operating lever 7 during driving, etc., move the operating lever 7 from the locking position shown in FIG. 3 to the first operating position shown in FIG. Just pull it up into position.

By pulling up the operating lever 7 to the fine adjustment position, the engaging pin 7a of the operating lever 7 pushes down the upper end of the first locking member 5 and swings the first locking member 5 counterclockwise in the figure. The toothed portion 5a of the first locking member 5 is disengaged from the toothed portion 4c of the arm 4, but the toothed portion 11a of the second locking lever 11 is removed from the toothed portion 9b of the restriction plate 9.
remains engaged.

That is, the engagement pin 5b that was in contact with the upper end of the elongated hole 11b at the locking position does not abut on the lower end of the elongated hole 11b until the fine adjustment position is reached.
Even if the locking member 5 swings counterclockwise from the meshing position with the toothed portion 4c, the swing of the first locking member 5 is caused by the second locking member 5.
It is not transmitted to the locking lever 11, and the second locking lever 11 is in the meshing position with the tooth portion 9b of the restriction plate 9,
The restriction plate 9 is locked by a second locking lever 11.

At this time, the toothed portion 5a of the first locking member 5 comes off from the toothed portion 4c of the arm 4, so that the arm 4
is released and the arm 4 becomes swingable, but since the restriction plate 9 remains locked by the second locking lever 11, the pivot 4a of the arm 4 is inserted into the elongated hole of the restriction plate 9. It can be oscillated within the fine adjustment range within 9a. Therefore, the angle adjustment range of the seat back 2b is limited to the fine adjustment range, and even if the angle of the seat back 2b is adjusted during driving, the seat back 2b will not be in the position shown in FIG.
b can only be tilted to the position shown in FIG. 5, and the seat bag 2b will not fall backward all at once, making it safe.

After finely adjusting the angle of the seat back 2b, when the operating lever 7 in the fine adjustment position is returned to the locking position, the engagement pin 7b of the operating lever 7 is moved to the first position.
The lower end of the locking member 5 is pushed up, and the first locking member 5 returns to the meshing position with the tooth portion 4c by the biasing force of the spring 5c.

Next, if you want to tilt the seat back 2b, which is in the position shown by the solid line in FIG. It is only necessary to pull it up from there to the coarse adjustment position, which is the final position, as shown in FIG.

When the operating lever 7 is pulled up to the coarse adjustment position,
The engagement pin 7a of the operating lever 7 pushes down the upper end of the first locking member 5 to swing the first locking member 5 in the counterclockwise direction in the figure, and the teeth 5a of the first locking member 5 engage the arm. 4, and after the engagement pin 5b comes into contact with the lower end of the elongated hole 11b, the second locking lever 11 swings together with the first locking member 5 in the counterclockwise direction in the figure. The tooth portion 11a comes off from the tooth portion 9b of the restriction plate 9.

At this coarse adjustment position, the second locking lever 11 is unlocked from the restriction plate 9, so the swing range of the arm 4 is not restricted by the elongated hole 9a of the restriction plate 9. The seat back 2b can be tilted to a desired position.

After roughly adjusting the angle of the seat back 2b, when the operating lever 7 in the coarse adjustment position is returned to the locking position, the engagement pin 7b of the operating lever 7 is moved to the first position.
The lower end of the locking member 5 is pushed up, and the first locking member 5 and the second locking lever 11 return to the meshing positions with the teeth 4c and 9b by the biasing forces of the springs 5c and 12, respectively.

Note that the configuration of the restraint mechanism 20 is not limited to the above embodiment.

(Effects of the invention) According to the seat reclining device according to the invention, when the operating lever is operated only in the first step from the locking position to the fine adjustment position, the first locking member comes off from the teeth of the arm. However, the second locking member is held in a restraining position where it meshes with the teeth of the limiting member, and the angle adjustment range of the seat back is limited to the fine adjustment range, so even if the seat back angle is adjusted during driving, , the seat bag does not fall all at once backwards and is safe.

Also, by operating one operating lever in two stages,
Since the adjustment position is switched between the fine adjustment position and the coarse adjustment position, the operability is improved and the number of parts is reduced, thereby reducing costs.

[Brief explanation of the drawing]

Figures 1 to 6 show an embodiment of the present invention; Figure 1 is a perspective view showing the main parts, Figure 2 is a side view showing the seat, and Figures 3 to 6 show the operation. It is an explanatory diagram for explanation. 1... Seat reclining device, 2... Seat, 2a... Cushion, 2b... Seat back, 3... Base plate, 4... Arm, 4c
...Tooth portion, 5...First locking member (locking member), 7
...Operation lever, 20...Restraint mechanism.

Claims (1)

[Claims for Utility Model Registration] In a reclining device for a seat in which the inclination angle of a seat back pivotally attached to a seat cushion can be adjusted, an arm fixed to the seat back side is pivoted to a base plate fixed to the cushion side. and a first locking member that engages with the teeth formed at the lower part of the arm and locks the swinging of the arm is provided so as to be biased towards the meshing position with the teeth of the arm; A restraint mechanism for fine adjustment is provided that can be switched between a restraint position in which the swing range of the arm is restrained within a fine adjustment range and a restraint release position in which the restraint is released; A limiting member that is swingable with respect to the arm with the pivot center concentric, a holding means that elastically holds the limiting member in a predetermined position, and a holding means that meshes with teeth formed on the limiting member. and a second locking member that locks the swinging of the restriction member, and the second locking member can be switched between a restraint position where it engages with the teeth of the restriction member and a restraint release position where the teeth are released. and urges the second locking member toward the restraint position to move the second locking member from the locking position in which the first locking member is pivoted to the base plate and meshes with the teeth of the arm. a fine adjustment position in which the engagement is released and the second locking member is held in the restraining position at the operating position of the second stage; and a final operating position from the locking position;
A seat reclining device comprising an operation lever that can be switched between two stages: a coarse adjustment position in which the engagement is released and the second locking member is switched to the restraint release position.