JPH0534Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a reclining mechanism, and more specifically, it includes a base that is attached to a vehicle seat etc. and fixed to the seat cushion side, and a rotation mechanism that rotates around the base. The present invention relates to a reclining mechanism that includes an arm that is movably supported and has one end fixed to a seat back side, and a spiral spring that biases the arm in a predetermined direction with respect to a base.

[Conventional technology]

2. Description of the Related Art Conventionally, vehicle seats and the like have used reclining mechanisms that can adjust the inclination angle of a seat back according to the physique or preference of a seated person.

This reclining mechanism is as shown in Figure 3.
A base 7 is fixed to the seat cushion side, an arm 8 is rotatably supported on the base 7 and has a seat back frame fixed to the upper part thereof, and the arm 8 is oriented in a predetermined direction with respect to the base 7. It is equipped with a spiral spring 1 for urging.

The spiral spring 1 has a first bent part 2 formed at the inner end and a second bent part 3 formed at the outer end. The first bending portion 2 is locked in a groove 5a extending in the diametrical direction formed at the tip of the fixed pivot shaft 5, and is locked on the other of the arm 8 side and the base 7 side. The second bent portion 3 is attached to the locking piece 6.
is designed to be locked.

[The problem that the idea attempts to solve]

However, with the conventional spiral spring 1, the spring force cannot be easily adjusted, and when the same spiral spring 1 is used in different car models, the spring force cannot be changed unless the set position of the spiral spring 1 is changed. I can't do it,
The spiral spring 1 having a different spring force must be formed for each vehicle model, which is uneconomical.
Further, when the spring force becomes weak due to long-term use of the spiral spring 1, it is not possible to easily adjust the spring force.

The purpose of this invention is to be able to easily and quickly adjust the spring force of a spiral spring, to be able to adjust various spring forces using the same spiral spring, and to increase the spring force when it becomes weak. This provides a reclining mechanism that can be used.

[Means to solve the problem]

The present invention was made in view of the above-mentioned problems, and includes a base, an arm rotatably supported on the base, and a spiral spring that biases the arm in a predetermined direction with respect to the base. In the reclining mechanism, a first bent portion formed at an inner end of the spiral spring is engaged with a groove of a pivot shaft provided on the base side, and a first bent portion formed at an outer end of the spiral spring is engaged with a groove of a pivot shaft provided on the base side. The second bending portion is locked to a locking piece formed on the arm, and an adjustment plate is fixed to the pivot shaft, and the adjustment plate is rotated around the pivot shaft for adjustment relative to the base. It is characterized by being able to be installed.

[Effect]

According to the present invention, the adjustment plate is fixed to the pivot shaft to which the first bent portion formed at the inner end of the spiral spring is engaged, and this adjustment plate is attached to the base and the adjustment Since the plate can be rotated around the pivot shaft, the spring force of the spiral spring can be adjusted by increasing or decreasing the amount of winding of the spiral spring, and the return force of the arm can be adjusted.

〔Example〕

The reclining mechanism according to the present invention will be described in detail below with reference to the drawings.

1 and 2 schematically show an embodiment of the present invention, and this reclining mechanism 11 has an arm 13 rotatably supported on a base 12. Although the pivot shaft 15 is attached to the base 12 side, the pivot shaft 15 can also be attached to the arm 13 side.

The angle of the base 12 and arm 13 is adjusted using a lock plate, an operating lever, etc. as an angle adjustment mechanism, but various conventionally known angle adjustment mechanisms can be used, and the detailed explanation will be given below. Omitted.

A pivot shaft 15 is attached to the base 12, a head 15b of the pivot shaft 15 is fixed to an adjustment plate 25, and the adjustment plate 25 is fixed to the base 12 by lock bolts 27, 27 so as to be rotationally adjustable. There is. A groove 15a extending in the diametrical direction of the pivot shaft 15 is formed at the distal end of the pivot shaft 15.

The inner end of the spiral spring 21 is bent inward to form a first bent part 2 that is locked in the groove 15a of the pivot shaft 15.
2 is formed, and the outer end portion, which is wound a plurality of times from the winding start end continuous with this first bent portion 22, is bent outward to form a second bent portion 23, and this second bent portion 23 is It is locked by a locking piece 16 formed on the arm portion 13a of the arm 13.

The adjustment plate 25 to which the head 15b of the pivot shaft 15 is fixed has a pair of locking holes 29, 2 at positions spaced apart by an equal length around the pivot shaft 15.
9 are formed, and lock bolts 27, 27 inserted into lock holes 29, 29 are selectively screwed into a plurality of screw holes 31, 31, 31, . . . formed on the base 12 side.

A plurality of screw holes 31 formed on the base 12 side,
31, 31, . . . are formed on the rotation locus of the lock bolts 27, 27 which rotate around the pivot shaft 15, and the adjustment plate 25 is attached to the base 12 so as to be rotationally adjustable. Therefore, the first bent portion 22 at the inner end of the spiral spring 21 is connected to the pivot shaft 15.
is locked in the groove 15a at the tip of the spiral spring 21.
The adjustment plate 25 was rotated with the second bent portion 23 at the outer end thereof being locked to the locking piece 16 of the arm portion 13a, and the desired spring force of the spiral spring 21 was obtained. The locking bolts 27, 27 are inserted into the locking holes 29, 29 of the adjustment plate 25 at this position, and the locking bolts 27, 27 are inserted into the opposing screw holes 31 of the plurality of screw holes 31, 31, 31, . . . formed in the base 12. , 31 are selected and screwed together, a state in which the spring force of the spiral spring 21 is adjusted can be obtained. It should be noted that the adjustment plate 25 may have only one locking hole 29, and the locking bolt 2
One 7 is also fine.

[Effect of idea]

The above is the configuration of one embodiment of the reclining mechanism according to the present invention. According to this configuration, the first bent portion formed at the inner end of the spiral spring is connected to the locked pivot shaft. The adjustment plate is fixed and attached to the base, and the adjustment plate can be rotated around the pivot axis, so that
The return force of the arm can be adjusted by increasing or decreasing the winding amount of the spiral spring, and it is also possible to obtain a reclining mechanism that can adjust to various spring forces using the same spiral spring.

[Brief explanation of drawings]

FIG. 1 and FIG. 2 each schematically show an embodiment of the reclining mechanism according to the present invention.
The figure is a perspective view of essential parts, FIG. 2 is a sectional view, and FIG. 3 is a front explanatory view of a conventional reclining mechanism. In the figure, 11... Reclining mechanism, 12...
Base, 13... Arm, 15... Pivot shaft, 15
a... Groove, 15b... Head, 16... Locking piece,
21... Spiral spring, 22... First bending section, 23
... Second refraction section, 25 ... Adjustment plate, 27
...Lock bolt, 29...Lock hole, 31...
...screw hole.

Claims (1)

[Scope of utility model registration request] In a reclining mechanism comprising a base, an arm rotatably supported on the base, and a spiral spring that biases the arm in a predetermined direction with respect to the base, the spiral spring is formed at an inner end of the spiral spring. A first bent portion formed on the base side is engaged with a groove of a pivot shaft provided on the base side, and a second bent portion formed on the outer end of the spiral spring is engaged with a groove formed on the arm. A reclining mechanism, characterized in that an adjustment plate is fixed to the pivot shaft, and the adjustment plate is rotatably attached to a base about the pivot shaft.