JPH1028624A - Angle adjusting mechanism of legless chair - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the setup work workability by lessening the number of parts of an angle adjusting mechanism for a legless chair, or the like. SOLUTION: A hinge pin 13 is passed into a hole 11b provided at the sidewall of a fixed arm 11 and a slot 12c provided at a mobile arm 12, and both these arms are coupled turably. At the fixed arm 11, irregularity 11 a continuous along the circular arc coaxial with the hole 11b is made inside the sidewall. At the mobile arm 12, irregularity 12a engageable with the irregularity 11a inside the fixed arm 11 is made at the tip of the sidewall on the extension in longitudinal direction of the slot 12c. A spring 14 energizes the irregularity 12a of the mobile arm 12 in the direction of pushing it against the irregularity 11a of the fixed arm 11, with its one end supported by the hinge pin 13 and its other end supported by the cut and erected element 12b inside the mobile arm 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an angle adjusting mechanism for adjusting a tilt angle of a backrest with respect to a seat such as a chair.

[0002]

2. Description of the Related Art As a conventional angle adjusting mechanism for a chair or the like, as disclosed in Japanese Utility Model Publication No. 59-20118, a movable arm having a fixed arm, a latch, and a control plate are rotated by a hinge pin. A pole that is rotatably supported on a fixed arm with a pin is engaged with a latch by a spring to prevent rotation in the direction in which both arms are deployed, and control when both arms are folded. There is a configuration using a ratchet mechanism so that the plate can be disengaged from the latch by the plate and can be deployed.

[0003]

The above-described conventional angle adjusting mechanism for a chair or the like includes a pole, a pin for supporting the pole, a spring for urging the pole, and engagement and disengagement of the pole and the latch. Since the control boards to be controlled are separate parts, the number of parts increases, and the control board must be inserted inside the movable arm, and the spring must be held in an elastically deformed state. There was a disadvantage. Therefore, an object of the present invention is to provide a low-cost angle adjustment mechanism for a seat and the like, which is configured with a smaller number of parts, is excellent in assembling workability, and is inexpensive.

[0004]

A feature of the present invention to achieve the above object is that a fixed arm to which either a seat portion such as a seating chair or a backrest portion is attached, and a fixing arm for the seat portion and the backrest portion are provided. The movable arm to which the other is attached is rotatably connected by a hinge pin, and in an angle adjusting mechanism capable of adjusting a deployment angle of the backrest with respect to the seat, a pair of holes into which the hinge pin is fitted are provided on a side wall, A fixed arm having radially formed concavities and convexities continuous along an arc concentric with a hole into which the hinge pin is inserted inside the side wall, and a pair of long holes penetrated by the hinge pin are provided on the side wall. A movable arm formed at the end of the side wall on the extension line in the longitudinal direction with irregularities which can be engaged and disengaged with the continuous irregularities formed inside the fixed arm, and one metal piece bent and formed; Hinge pin supports the other end to the inside of the movable arm, lies in the structure and a spring for urging to press irregularities provided on the movable arm to the unevenness provided on the fixed arm.

According to the present invention, the continuous irregularities formed inside the fixed arm and the irregularities formed at the distal end of the movable arm prevent rotation of the fixed arm and the movable arm in a developing direction, and a folding direction. It may be formed in a sawtooth shape so as to allow rotation to the side.

[0006]

According to the angle adjusting mechanism of the present invention, the unevenness formed at the tip of the movable arm is elastically engaged with the continuous unevenness formed inside the fixed arm by being biased by the spring to elastically engage with the fixed arm. The rotation of the movable arm is prevented. To adjust the angle of deployment between the fixed arm and the movable arm, pull the movable arm against the spring to remove the irregularities at the tip from the irregularities formed continuously in an arc inside the fixed arm, and then move around the hinge pin This is performed by rotating the arm, and then engaging the unevenness at the tip of the movable arm with an arbitrarily selected portion of the unevenness inside the fixed arm.

The unevenness formed continuously inside the fixed arm and the unevenness formed at the tip of the movable arm prevent rotation of the fixed arm and the movable arm in the developing direction and allow rotation in the folding direction. When the fixed arm and the movable arm are formed in a folded shape, the deployment angle of the fixed arm and the movable arm in the folding direction is adjusted by rotating a portion of the movable arm to which either the seat portion or the backrest is attached in the folding direction. Performed by Adjustment in the deployment direction is performed by pulling the movable arm against the spring to release the irregularities at the tip from the irregularities inside the fixed arm, then rotate the movable arm around the hinge pin, and then remove the irregularities inside the fixed arm. This is performed by engaging the unevenness formed on the tip of the movable arm with an arbitrarily selected location.

According to the present invention, the pole used in the conventional angle adjusting mechanism using the ratchet mechanism, the pin supporting the pole, and the control plate are eliminated, and the unevenness formed at the tip of the movable arm is urged by a spring. Since the rotation of the fixed arm and the movable arm is prevented by engaging with the continuous unevenness formed inside the fixed arm, the number of parts is greatly reduced, and a seat chair with excellent assembling workability etc. Can be provided.

The unevenness formed continuously in an arc shape on the inner side of the fixed arm and the unevenness formed on the tip of the movable arm prevent rotation of the fixed arm and the movable arm in the developing direction and rotate in the folding direction. In the case of a saw-tooth shape that allows movement, the angle adjustment in the folding direction can be performed by rotating the movable arm without pulling it against the spring. Operability is improved.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of an angle adjusting mechanism 10 such as a seating chair according to a first embodiment of the present invention.

The angle adjusting mechanism 10 is constructed such that a movable arm 12 is rotatably mounted inside a fixed arm 11 with a hinge pin 13 passing through a hole 11b and a long hole 12c provided respectively. The fixed arm 11 is made of sheet metal and has a substantially U-shaped cross section. On the inside of the pair of side walls, a continuous internal gear sector gear-shaped unevenness 11a that draws a circular arc concentric with the hole 11b into which the hinge pin 13 is fitted is pressed. The portion 11c to which the seat is attached is formed by molding, and is formed in a pipe shape. The movable arm 12 is made of metal and has a substantially U-shaped cross section. The movable arm 12 has a pair of long holes 12c on the side wall.
The concave and convex portions 1 continuously formed in an arc shape inside the fixed arm 11 at the tip portions of both side walls located on the extension of the longitudinal direction of
An irregularity 12a that can be engaged with 1a is formed. The spring 14 is formed by bending a leaf spring material, and is located between both side walls of the movable arm 12. One end of the spring 14 is formed on a cut-and-raised portion 12 b formed inward from the side wall of the movable arm 12, and the other end is connected to the hinge pin 13. Locking, irregularities 1 inside fixed arm 11
The movable arm 12 is urged in a direction to press the irregularities 12a at the tip of the fixed arm 12 against 1a.

When the angle adjusting mechanism 10 of the first embodiment is in the state shown in FIG. 2, the unevenness 12a at the tip of the movable arm 12 urged by the spring 14
Is engaged with the continuous unevenness 11a inside the inside. This engagement prevents the movable arm 12 from rotating with respect to the fixed arm 11.

In order to change the angle of the movable arm 12 with respect to the fixed arm 11, a portion 12d to which the backrest of the movable arm 12 is attached is grasped by hand, and the direction indicated by an arrow A in FIG. Hespring 1
4 to release the engagement between the continuous irregularities 11a formed inside the fixed arm 11 and the irregularities 12a formed at the tip of the movable arm 12, and then rotate the movable arm 12 by an arbitrary angle. When the hand is released, the movable arm 12 is returned by the spring 14 as shown in FIG. 4, and the unevenness 12a at the tip of the movable arm engages with the unevenness 11a inside the fixed arm 11 to move the movable arm 1 with respect to the fixed arm 11.
2 is prevented from rotating.

According to the present embodiment, the pole used in the angle adjusting mechanism using the conventional ratchet mechanism,
The pin and the control plate for supporting the fixed arm 11 are eliminated, and the unevenness 12a formed at the tip of the movable arm 12 is urged by the spring 14 to engage with the continuous unevenness 11a formed inside the fixed arm 11, thereby making the fixed arm 11 Movable arm 12
Since the rotation is prevented, the number of parts is significantly reduced, and an angle adjustment mechanism such as a seat chair with excellent assembling workability is provided.

As a second embodiment of the present invention, an angle adjusting mechanism 20 is shown in FIG. The overall configuration of this embodiment is the same as that of the above-described first embodiment, but the shape of the tooth tips of the irregularities 21 a formed inside the fixed arm 21 is different from that of the solid arm 21. Although it is prevented, rotation in the folding direction is formed in a shape that allows it, and the shape of the unevenness 22 a at the tip of the movable arm 22 is formed in a shape corresponding to the unevenness 21 a formed in the fixed arm 21. That is, the angle adjusting mechanism 20 of the present embodiment employs a ratchet mechanism that prevents rotation of the movable arm with respect to the fixed arm in the developing direction and allows only rotation in the folding direction.

In the present embodiment, the angle of deployment of the fixed arm 21 and the movable arm 22 in the folding direction is adjusted by rotating the movable arm 22 in the folding direction indicated by arrow B by holding the portion 22d to which the backrest is attached by hand. Let me do it. When the movable arm 22 is rotated in the folding direction, the movable arm 2
(2) The engaging portion between the irregularities 22a at the tip and the continuous irregularities 21a inside the fixed arm 21 slides against the biasing force of the spring 24, and the continuous irregularities 21a inside the fixed arm 21.
And the engagement of the irregularities 22a at the tip of the movable arm 22 are disengaged,
The respective convex portions come into contact with each other. When the movable arm 22 is further rotated in the folding direction, the unevenness 22 at the tip of the movable arm 22 urged by the spring 24
a engages with a place next to the place where the continuous irregularities 21a on the inner side of the fixed arm 21 have been engaged to the end. The adjustment in the unfolding direction is performed in the same manner as in the first embodiment described above.
2 Pull along the long hole 22c of the side wall of the movable arm 22 in the opposite direction to the unevenness 22a at the tip,
This is performed by once disengaging the a from the irregularities 22a at the tip of the movable arm, and then engaging the arbitrarily selected portion of the irregularities 21a inside the fixed arm.

According to this embodiment, in addition to the advantage that the number of parts of the first embodiment described above is greatly reduced and the assembling workability is excellent, the adjustment of the angle in the folding direction requires the movable arm to resist the spring. Since the rotation can be performed without pulling, the operability of the angle adjusting mechanism such as the chair of the first embodiment can be improved.

If a shape as shown in FIG. 6 is adopted for a portion to which the seat or the backrest is attached, an angle adjusting mechanism having the same dimensions can be assembled to the backrest and the seat formed from pipes having different inner diameters. Therefore, the versatility of the angle adjusting mechanism can be improved.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of an embodiment of an angle adjusting mechanism of a seat and the like according to the present invention.

FIG. 2 is a longitudinal sectional view showing a state where an angle adjusting mechanism of the present invention is most developed.

FIG. 3 is a longitudinal sectional view showing a state where the fixed arm and the movable arm of the angle adjusting mechanism of the present invention are disengaged from each other.

FIG. 4 is a longitudinal sectional view showing a state in which the angle of the movable arm with respect to the fixed arm of the angle adjusting mechanism of the present invention has been changed.

FIG. 5 is a longitudinal sectional view of an angle adjusting mechanism according to a second embodiment of the present invention.

FIG. 6 is an external perspective view of the angle adjusting mechanism of the present invention in which the shapes of the seat and the backrest mounting portion are changed.

[Explanation of symbols]

11, 21 ... fixed arm, 11a, 21a ... unevenness, 11
b, 21b ... holes, 12, 22 ... movable arms, 12a, 2
2a: unevenness, 12c, 22c: long hole, 13, 23: hinge pin, 14, 24: spring.

Claims (2)

[Claims] 1. A fixed arm to which either a seat portion or a backrest portion of a seat chair or the like is attached, and a movable arm to which the other of the seat portion and the backrest portion is attached are rotatably connected by hinge pins. In an angle adjusting mechanism capable of adjusting a deployment angle of a backrest portion with respect to the seat portion, a pair of holes into which the hinge pins are inserted are provided on a side wall, and an arc concentric with the hole into which the hinge pins are inserted inside the side wall. A fixed arm having radially continuous irregularities formed along the side thereof, and a pair of long holes penetrated by the hinge pin are provided on the side wall, and the fixed arm is formed inside the fixed arm at the tip of the side wall on a longitudinal extension of the long hole. A movable arm having irregularities capable of engaging and disengaging continuous irregularities, and one metal piece is formed by bending, one end is supported by a hinge pin and the other end is supported inside the movable arm; Angle adjusting mechanism such as a chair seat, characterized in that a spring which urges the pressing irregularities provided on the movable arm to the unevenness provided on the fixed arm. 2. The method according to claim 1, further comprising the step of forming a continuous uneven portion formed inside the fixed arm and an uneven portion formed at the tip of the movable arm so as to prevent the fixed arm and the movable arm from rotating in the developing direction, and The angle adjusting mechanism for a seat or the like according to claim 1, wherein the angle adjusting mechanism is formed in a sawtooth shape so as to allow rotation.