JPH0411546Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a seat reclining device.
More specifically, the seat cushion includes a base fixed to a seat cushion, an arm rotatably supported on the base, and a spiral spring attached between the base and the arm. This invention relates to a seat reclining device in which a seat back can be tilted back and forth.

[Conventional technology]

2. Description of the Related Art Seat reclining devices that tilt a seat back back and forth are conventionally known.

This reclining device includes a base fixed to the seat cushion and an arm attached to the seat bag, and the arm is rotatable with respect to the base. The rotational position of the arm is locked by a lock mechanism, and when the lock mechanism is released, the seat back is biased forward by the action of a spiral spring serving as a return spring.

[Problem that the invention attempts to solve]

If the lock mechanism is released while the seatback is tilted backwards, that is, the spiral spring is sufficiently tightened, the seatback will tilt forward forcefully due to the return force of the spiral spring, providing a strong force for the occupant. There was a risk of causing a shock. For this reason, the present applicant has previously proposed a reclining device (Japanese Utility Model Publication No. 10432/1983) which is provided with a spring member that applies a spring force in the opposite direction to the return spring on the backrest.

In conventional reclining devices, the number of parts increases, such as installing a spring member in a separate location from the return spring, such as the base, and providing a stopper to receive this spring member, and requiring installation space, resulting in an increase in the size of the reclining device. It was something I had no choice but to do.

The purpose of this invention is to eliminate the risk of the seat back giving a strong impact to the occupant when the seat back is tilted forward.
There is no risk of increasing the size of the reclining device,
The present invention provides a seat reclining device that is extremely economical without the risk of increasing the number of parts or installation space.

[Means for solving problems]

The present invention was made in view of the above-mentioned problems, and includes a base fixed to a seat cushion, an arm rotatably supported on the base, and a spiral spring attached between the base and the arm. In the seat reclining device, the seat back attached to the arm can be tilted back and forth, and a brake member is provided adjacent to the spiral spring so that the spiral spring is wound when the arm is tilted forward. When the spiral spring is unwound, the outer side of the spiral spring comes into contact with the brake member, so that the forward tilting speed of the seat bag is reduced.

[Effect]

According to the present invention, a brake member is provided adjacent to the spiral spring, and the brake member expands the spiral spring when the spiral spring is unwound. As the spiral spring becomes longer, the outer part of the spiral spring comes into contact with the brake member, the expansion of the spiral spring is gradually suppressed, the forward tilting speed of the arm is eased, and the speed is sufficient for the seat back to contact the seated person. There is no risk that the seat will fall and cause an impact force to the seated person.

〔Example〕

An embodiment of the seat reclining device according to the present invention will be described in detail below with reference to the drawings.

1 and 2 schematically show a first embodiment of a seat reclining device according to the present invention, and this reclining device 1 includes a base 2 fixed to the seat cushion side, and a base 2 fixed to the seat cushion side. 2
An arm 3 is rotatably attached to the seat via a pivot shaft 4, and a seat bag is fixed to the arm 3.

A board 5 is attached to the base 2, and this board 5
An L-shaped operating lever 6 is pivotally supported by a pin 7, and a spring 8 stretched between the bent end portion 6a and the lower part of the board 5 causes the operating lever 6 to move in the direction indicated by the arrow a.
It is biased in the counterclockwise direction shown by . Further, a known locking mechanism is provided between the base 2 and the arm 3 that can adjust the relative rotation angle as appropriate, and although detailed explanation thereof will be omitted, it is possible to rotate the operating lever 6 in the direction of arrow b. The locked state is released by

A pivot shaft 4 for mounting the spiral spring 11 is provided on the base plate 5, and a first bent portion on the winding start end side of the spiral spring 11 is formed in a long groove 4a extending in the diametrical direction formed at the tip of the pivot shaft 4. 12 has been inserted and locked. Further, a locking piece 13 is formed on the arm 3, and a second bent portion 1 formed at the outer end of the spiral spring 11
4 is locked to the locking piece 13.

In this embodiment, a pivot shaft 4 is attached to the substrate 5 on the base 2 side.
was fixed to form the locking piece 13 on the arm 3, but
It is possible to have a reverse configuration.

Adjacent to the outer side of the spiral spring 11, a brake member 16, which characterizes the present invention, is attached to the base plate 5.

The brake member 16 is formed from a curved metal plate, as shown in FIG.
When the arm 3 is tilted backward, there is an appropriate distance between the outer side of the spiral spring 11 and the brake member 16, and as the arm 3 becomes approximately vertical, the spiral spring 11 gradually expands and the outer side of the spiral spring 11 is expanded. When the arm 3 is tilted most forward as shown in FIG. 2, the spiral spring 11 is unwound to the maximum extent and expanded, so that the outer side of the spiral spring 11 is brought into close contact with the brake member 16. It is formed.

Although this embodiment has been described as using a curved metal brake member 16, two brake members 16, 16 may be arranged so as to sandwich the spiral spring 11.

FIGS. 3 and 4 each schematically show a second embodiment of the present invention, and parts corresponding to those of the first embodiment mentioned above are given the same reference numerals, and further detailed explanation will be given here. Although omitted, the present invention is characterized in that a stepped portion 11b is formed in the curved portion 11a at the outer end of the spiral spring 11.

By forming the stepped portion 11b of the spiral spring 11 at a position facing the brake member 16, when the arm 3 is tilted backward, the stepped portion 11b of the spiral spring 11 is placed above the brake member 16, as shown in FIG. When the operating lever 6 is rotated in the direction of arrow b from this state and the lock mechanism is released, the return force of the spiral spring 11 causes the arm 3 to
is tilted forward, and the spiral spring 11 is expanded by unwinding the spiral spring 11, and the stepped portion 1 of the spiral spring 11 is expanded.
1b collides with the tip 16a of the brake member 16 in a substantially vertical state of the arm 3, the return force of the spiral spring 11 that rotates the arm 3 is relaxed, and the arm 3 further rotates due to the return force of the spiral spring 11. Then,
As shown in FIG. 4, the brake member 16 is in a state where it has climbed over the stepped portion 11b, and the brake member 16 is in close contact with the upper outer part of the stepped portion 11b of the spiral spring 11.
Therefore, the forward tilting speed of the seat bag is firstly relieved by the stepped portion 11b of the spiral spring 11, and then sequentially as the outer portion of the spiral spring 11 comes into contact with the brake member 16.

[Effect of idea]

The above is the configuration of an embodiment of the seat reclining device according to the present invention. According to this configuration, the locking mechanism of the arm is released while the seat back is tilted backward, and the arm is rotated by the spiral spring. When tilting forward due to the return force, the outer part of the spiral spring comes into contact with the brake member, and the return of the rotation of the arm is slowed down. Since it is installed close to the outside, it does not require an increase in installation space and the number of parts is kept to a minimum.It is suitable for making the reclining device smaller and lighter, making it an extremely economical seat reclining device. You can get it.

In the embodiment described above, the brake member 16
Although the case where the brake member 16 is fixedly attached to the board 5 has been described, one end of the brake member 16 is rotatably supported, and the other end is attached to the spiral spring 11 by a compression spring or the like.
The spiral spring 1 is attached so as to be pressable on the outer side of the arm 3, and a compression spring or the like is applied according to the forward inclination of the arm 3.
It is also possible to relax the return force of 1.

[Brief explanation of drawings]

1 and 2 respectively schematically show a first embodiment of the seat reclining device according to the present invention, and FIG. 1 is an explanatory side view of the arm in a rearward tilted state;
Figure 2 is a side view of the arm in a forward tilted state;
4 and 4 schematically show the second embodiment of the present invention. FIG. 3 is a side view of the arm in a backwardly tilted state, and FIG. 4 is a side view of the same arm in a forwardly tilted state. be. In the figure, 1... reclining device, 2... base, 3... arm, 4... pivot shaft, 5... board,
6... Operating lever, 11... Spiral spring, 11a...
...Curved part, 11b...Step part, 12...First bending part, 13...Locking piece, 14...Second bending part,
16...Brake member.

Claims (1)

[Scope of utility model registration request] The seat bag includes a base fixed to a seat cushion, an arm rotatably supported on the base, and a spiral spring attached between the base and the arm, and the seat bag attached to the arm can be tilted back and forth. In the seat reclining device of the present invention, a brake member is provided adjacent to the spiral spring, and when the arm is tilted forward, the spiral spring is unwound, and at the time of unwinding, the outer side of the spiral spring is pressed against the brake. 1. A seat reclining device, characterized in that the seat back comes into contact with a member so that the forward tilting speed of the seat back is relaxed.