JPH07246123A - Swinging mechanism for seat plate and back rest of chair - Google Patents

Abstract

PURPOSE:To enable subduction on. the front or rear side of a seat plate by a simple structure and obtain a swinging mechanism to interlock forward or backward inclination action of a back rest. CONSTITUTION:To the upper end portion of a leg support 1 in a revolving chair, a base block 2 is attached. which is further pivotally attached with a horizontal shaft A, and an arm member 3 is provided to project forward from the block 2 by making the shaft A as its center. To the front end of this arm member 3, the front end of a seat plate 4 is attached with a horizontal shaft B, and between the underside surface of the plate 4 and the upper surface of the block 2, a torsion bar spring 5 is supported by the shaft B and interpolated, while the lower end side of a back rest support member 6 to which a back rest is attached is formed to extend to the underside surface of the seat plate 4, and the rear end of the seat plate 4 pivotally attached to the intermediate portion on the extended portion of the support member 6 through a horizontal shaft D. Also, the front end of the extended portion 61 is pivotally attached to the arm member 3 by a horizontal shaft E through an elongated hole C formed in the arm member 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly relates to a swing mechanism in which a seat plate and a backrest of an office swivel chair are interlocked.

[0002]

2. Description of the Related Art Conventionally, a swing mechanism in which a seat plate and a backrest are interlocked in a swivel chair is disclosed in Japanese Patent Laid-Open No. 61-172515.
Many proposals were made, such as No.
Some are put to practical use.

In the rocking mode in which the seat plate and the backrest are interlocked with each other by the mechanism proposed so far, if the seat plate sinks due to a load applied by a person, the backrest tilts backward in conjunction with this sinking, or Is designed so that if a person leans on the backrest, the backrest tilts backward, and at the same time, the seatboard also sinks.

However, the manner in which a person hangs on a chair is not limited to the posture that can be dealt with by the conventional swing mechanism. For example, there is a case where a person sits on a chair with such a weight that the front of the seat board sinks to the front side.

In such a case, the conventional swinging mechanism does not perform a corresponding operation, or even if a mechanism capable of operating is provided, the structure is too complicated, resulting in an increase in cost of component parts, There are various problems that it takes time to assemble and the operation is not smooth. Also, if the seat plate does not sink forward, if you hang it on a chair in a forward leaning posture, the posture of that person will be unnatural and the abdomen will be pressed or the thigh will be pressed against the seat surface, The comfort of the chair is not good either.

[0006]

SUMMARY OF THE INVENTION Accordingly, the problem to be solved by the present invention is to enable a front side or a rear side of a seat plate to be sunk by means of a simple structure, and to set these sunk parts. An object of the present invention is to provide a swinging mechanism capable of interlocking a retracting operation and a forward or backward inclination operation of a backrest, and moreover realizing these operations smoothly.

[0007]

In order to solve the above-mentioned problems, the structure of the present invention has a base block 2 attached to the upper end portion of a leg support 1 of a swivel chair, and the block 2 has the above-mentioned structure. The arm member 3 is pivotally attached to the front of the column 1 on the rear side near the upper end of the column 1 by a horizontal axis A, and the arm member 3 is allowed to sink forward around the axis A. 2 is provided so as to project forward from the tip of the seat member 2, and at the tip of the arm member 3, a seat plate press is provided.
The tip end of the plate 4 is pivotally attached by a horizontal axis B, and the plate 4 and the block 2 are repulsed between the lower surface of the plate 4 and the upper surface of the block 2 so that the plate 4 and the block 2 are separated from each other. A torsion spring 5 on which a force acts is supported by the shaft B so as to intervene, while a lower end side of a backrest support member 6 to which a backrest is attached is extendedly formed on the lower surface side of the seat plate 4 to form the support member 6. The rear end of the seat plate 4 is pivotally attached to the middle of the extension of the arm member through a horizontal axis D, and the front end of the extension 61 is passed through an elongated hole C formed in the arm member 3. It is characterized by being pivotally attached to the arm member 3 by a horizontal axis E.

[0008]

The seat plate 4 is mounted on the base block 2 by the shaft B which supports the torsion spring 5 at the front end of the arm member 3 which is swingably mounted on the base block 2 by the shaft A. Therefore, it is possible to swing up and down with respect to the front and rear of the axis A. Further, a support member 6 for the backrest pivotally attached to the arm member 3 and the seat plate 4 by axes E and D, respectively.
Is coupled to the elongated hole C of the arm member 3 through the shaft E, so that the seat plate plate 4 and the backrest support member 6 swing in conjunction with the swing of either one of them. Move.

[0009]

Embodiments of the present invention will now be described with reference to the drawings.
FIG. 1 is a side sectional view of the mechanism of the present invention in which no load is applied,
2 is a side sectional view in which the back side of the seat plate is most depressed and the backrest mounting member is tilted rearward most. FIG. 3 is a side sectional view in a forward tilted state. It is a perspective view which shows the whole structure.

In these figures, reference numeral 1 is a pole-shaped leg support of a swivel chair for office use, and the height thereof is increased by a gas spring (not shown) inserted in the support. Can be freely changed within a certain range. In addition, the height adjustment may be performed by a height-adjustable leg column other than the gas spring, for example, a telescopic structure.

Reference numeral 2 is a base block having a substantially box shape attached to the upper end of the column 1. In the illustrated example, a front side of the main body 2a forms a dish-like receiving seat 2b which is slightly elevated. In addition, a horizontal bearing 2c oriented parallel to the width direction of the seat plate 4 is formed on the front side in the vicinity of the column 1.

Reference numeral 3 denotes an arm member having a substantially concave shape on the front surface. The arm member 3 pivotally attaches the rear end sides of the left and right side walls 3a to the bearing 2c of the block 2 by an axis A. A front end side of the side wall 3 is pivotally connected to a front end side of a seat plate plate 4 described later by a shaft B.

The seat plate 4 is a plate-like plate having an appropriate seat plate sheet (not shown) provided on the upper surface thereof, and has side walls on both sides when viewed from the front. A portion 4a is formed so as to hang down, and the front end of the side wall 4a is the arm member 3 described above.
And a rear end thereof is pivotally connected to a support member 6 of a backrest (not shown) described later by a shaft D. The axes A, B and D are parallel.

The seat plate plate 4 has a lower surface facing the seat 2b of the base block 2 as a seat 4b. Between the seats 4b and 2b, the shaft B is made of synthetic resin. Color
Alternatively, the torsion spring 5 supported through the sleeve-shaped cylindrical body 51 has the start and the end portions 5a and 5b of the torsion and the seat 2
It is interposed by abutting on b and 4b.

Reference numeral 6 denotes a backrest supporting member to which a backrest is attached. The backrest is formed in a curved extension so that the lower portion is positioned on the lower surface of the seat plate plate 4 along the surface thereof. The extension portion 61 has a bifurcated side wall 61a on the front end side so that the side wall 2c of the base block 2 and the side wall 3a of the arm member 3 can be sandwiched from the outside here. Has been formed. Further, the tip end of the side wall 61a of the extension portion 61 is formed to the front of the axis A so as to be connected to the arm member 3.

Thus, the support member 6 has the extension 6
At the side wall 61a at the tip of the shaft 1, an arm member 3 pivotally attached to the base block 2 by an axis A is connected by an axis E through an elongated hole C formed in front of the axis A. The side wall 61a on the rear end side of the extension portion 61 is pivotally connected to the side wall 4a on the rear end portion of the seat plate plate 4 by an axis D.

In the above mechanism, the end 5 of the torsion spring 5 is
b is brought into contact with and supported by the upper surface of the spring receiving block 7 on the upper surface of the receiving seat 2b of the base block 2.
The screw receiver 2d formed on the seat 2b of the base block 2
The hemispherical crown 8a of the adjusting screw 8 screwed on the upper surface supports the adjusting screw 8 from the lower surface. Reference numeral 7a is a concave spherical contact portion formed on the bottom surface of the spring receiving block 7, and is a portion to which the crown 8a is fitted and abutted. Reference numeral 8b is a lever for rotation operation which is integral with the screw 8.

With the above construction, when the adjusting screw 8 is rotated and the crown portion 8a thereof is advanced upward, the rear end side 5b of the torsion spring 5 is pushed up to the seat plate 4 side, and this spring is pushed up. The repulsive force of 5 can be strengthened.

The mechanism of the present invention configured as described above operates as follows. Now, when a person puts on the seat sheet (not shown) provided on the seat plate 4, the load is
The seat plate 4 including the seat sheet is covered with this plate.
Since the support 4 is supported by the receiving seat 2b of the base block 2 via the torsion spring 5, it is supported by the base block 2 via the repulsive force of the spring 5.

The seat plate 4 in this state is elastically supported by the seat 2b through the starting end 5a and the terminating end 5b of the torsion spring 5 at its substantially intermediate position as described above.
The plate 4 is pivotally supported by the shaft B at the front end of the arm member 3 whose front end is supported by the base block 2 by the shaft A, and the seat plate plate 4 is supported. The rear end is connected to the front side of the extension portion 61 of the backrest support member 6 supported by the base block 2 through the elongated hole C and the shaft E through the shaft D, so that the seat plate plate is formed. 4 is an arm member 3 interposed and is supported by the repulsive force of the spring 5 and is in front of the plate 4 about the axis A,
Subtractive rocking is possible on either side of the rear.

When the plate 4 is swung back and forth with respect to the axis A, the plate 4 is repulsively supported by the base block 2 by the torsion spring 5 supported by the shaft B. And the front end of the extension portion 61 of the backrest supporting member 6 supporting the rear end of the seat plate plate 4 by the shaft D is connected to the arm member 3 through the elongated hole C and the shaft E. The front of the support member 6 to which the backrest is attached,
Accompanied by tilting backwards.

That is, if the seat plate 4 is depressed at the front end side, this depression action becomes integral with the arm member 3 and resists the repulsive force of the torsion spring 5 about the axis A. At the same time, the arm member 3 is depressed and the plate 4 is lifted up rearward, and at the same time, the front side of the seat plate plate 4 and the arm member 3 are depressed. Since the front end of the extended portion 61 of 6 and the rear end are lifted up, the rising portion of the support member 6 pivots forward and inclines, which causes the seat plate plate 4 to move. The rearward lifting operation and the forward leaning of the backrest support member 6 are synchronized.

On the other hand, when the seat plate 4 is sunk on the rear end side, this sunk operation is performed around the axis B of the arm member 3, and the plate 4 and the backrest supporting member 6 are operated. The rearward tilting motion of the support member 6 is synchronously brought about by the connection relationship with the.

At this time, the plate 4 inclines rearward about the axis B so that the bottom wall 3b of the arm member 3 contacts the outer surface of the seat 2b of the base block 2 and the arm member 3 is formed. This is because it prevents the angular rotation about the axis A in the clockwise direction. It should be noted that the above-described synchronous operation is brought about even when a load is applied to the support member 6 of the backrest and the seat member is tilted rearward, the rear side of the seat plate plate 4 driven by this tilt is depressed.

As the constituent members of the mechanism of the present invention which operates as described above, a commercially available product is used for the torsion spring 5, and the column 1, base block 2, arm member 3, seat plate 4, and so on. Each member such as the support member 6 for the backrest can be easily manufactured by any means such as metal casting, forging, press working, or synthetic resin molding because of its simple form. .

[0026]

As described above, the present invention is as described above, wherein the seat plate plate is connected to the arm member whose front end is pivotally attached to the base block and whose rear end is through the backrest support member. By connecting to the arm members respectively, the support members are formed so as to be swingable in the front and rear thereof, and the support member to which the backrest is attached is connected to the seat plate which allows such operation. Since the support member is connected to the arm member by a shaft that passes through an elongated hole, the seat plate plate is tilted according to the posture of the person sitting on the chair and the back-side tilt is interlocked therewith. Or, it is possible to smoothly realize the inclination of the seat plate plate which is interlocked with the inclination of the backrest,
Moreover, the mechanism for performing such an operation has a small number of parts and is simple, which is advantageous in manufacturing.

In particular, the sinking action before and after the seat plate according to the present invention is an action accompanied by cushioning by the repulsive force of the torsion spring interposed between the plate and the base block. Therefore, it exhibits a unique characteristic that it can smoothly and flexibly follow the forward leaning or backward leaning posture that a person puts on the seat plate.

[Brief description of drawings]

FIG. 1 is a side sectional view showing a state in which no load is applied to the mechanism of the present invention.

[FIG. 2] The rear side of the seat plate is most depressed, and
The side cross-sectional view of the state where the backrest mounting member is tilted rearmost.

FIG. 3 is a side sectional view in a forward tilted state.

FIG. 4 is a perspective view showing the overall configuration of the mechanism of the present invention.

[Explanation of symbols]

 1 Support 2 Base Block 3 Arm Member 4 Seat Plate Plate 5 Coil Spring 6 Backrest Support Member 7 Gas Spring A, B, D, E Horizontal Axis C Long Hole

Claims (1)

[Claims] 1. An upper end portion of a leg support 1 of a swivel chair,
A base block 2 is attached, and the rear side of the block 2 is pivotally mounted near the upper end of the column 1 by a horizontal axis A in front of the column 1, and the forward depression about the axis A is performed. An arm member 3 which is allowed to move is provided so as to project forward from the tip end portion of the block 2, and the tip end portion of the seat plate plate 4 is attached to the tip end portion of the arm member 3 by a horizontal shaft. Between the lower surface of the plate 4 and the upper surface of the block 2, there is provided a torsion spring 5 which is pivotally attached by B and exerts a repulsive force on the side separating the plate 4 and the block 2 from each other. While being supported by the shaft B and interposed, the lower end side of the backrest support member 6 to which the backrest is attached is extendedly formed to the lower surface side of the seat plate plate 4, and the seat plate pre-position is provided in the middle of the extended portion of the support member 6. The pivoting of the rear end of the grate 4 through a horizontal axis D, Swing of a seat plate and a backrest of a chair, characterized in that the front end of the long portion 61 is pivotally attached to the arm member 3 through a long hole C formed in the arm member 3 by a horizontal axis E. mechanism.