JPH0513231Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a chair equipped with a reclining mechanism that lowers the rear end of the seat while keeping the height of the rear end constant.

(Prior art) Conventionally, a reclining mechanism has been provided in which, while keeping the height of the front end of the seat constant, the rear end of the seat is lowered by a predetermined height, and the backrest is tilted at a predetermined angle as the rear end of the seat lowers. The chair is already known.

For example, there are methods that use a simple link mechanism and spring to lower the rear end of the seat to change the inclination angle of the backrest, and methods that use a control lever to operate a gas spring to automatically adjust the inclination of the backrest to the desired position. There are methods to adjust the angle.

(Problem to be solved by the invention) However, in the reclining mechanism of these chairs, especially when using a gas spring, it is difficult to smoothly adjust the inclination angle of the seat and backrest while the seated person remains seated. Therefore, it is difficult to change the seating position so that the seating position can be finely adjusted.

In other words, the main purpose of the gas spring is to maintain a lock in the inclination angle of the backrest, etc., and when the gas spring is opened, the positions of the seat and backrest can be moved freely within the reclining mechanism.

Therefore, unless the force is adjusted depending on the weight of the seated person, that is, the magnitude of the load applied to the seat, it will not be possible to maintain a state commensurate with the repulsive force of the gas spring.

Therefore, if the repulsive force of the gas spring is weak, the seater will be able to sit with his or her hips slightly lifted from the seat.
Alternatively, it was necessary to remove the load by moving one's body away from the backrest before reclining.

In addition, in recent years, further studies have been added to this type of chair from an ergonomic point of view, and in order to improve it according to the purpose of use and provide a chair that is easy to use, we have developed There is a need for the development of a chair that can accommodate variations due to individual differences, is safe and easy to operate for women and women, and is equipped with an automatic reclining mechanism.

This invention was devised in response to the above request, and its purpose is to allow the user to adjust the spring force to match the weight of the seated person, and to adjust the backrest relative to the seat according to the inclination angle of the backrest. To provide a chair capable of correcting the height position of the chair and smoothly adjusting a desired sitting posture.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a chair in which the backrest tilts backward as the rear end of the seat lowers around the pivot that supports the front end of the seat. , a mounting frame 3 movably attached to a support 1 fixed to a leg support 2, and a gas provided between the support 1 and the mounting frame 3 to determine the seating posture of the seat A and the backrest B. The mounting frame 3 includes a seat support frame 4, a backrest guide column 6 that is swingable about a shaft 9 pivotally supported at the rear end of the support frame, and one end of the mounting frame 3. The guide column is connected to the movable frame 20 of the backrest attached to the rail portion 6b of the guide column 6, and the other end side is connected to compression spring adjusting devices 24 and 25 that bias the gas spring 23 in the direction in which it expands. 6, and the link member adjusts the amount of movement of the movable frame in conjunction with the tilting of the guide column.

(Function) Since the present invention is configured as described above, the following effects are achieved while the seated person remains seated. In other words, in the present invention, when the rear end of the support frame of the seat is lowered, the movable frame attached to the rail portion of the guide column is moved relatively downward along the rail portion by the link member in conjunction with the tilting of the guide column. This eliminates the need to lift up the jacket or shirt of the seated person who is in contact with the backrest, and eliminates the need to lift the hips or tilt the body forward to take distance from the backrest. Further, by means of adjusting the degree of compression of the spring, the force of the compression spring provided in addition to the gas spring can be adjusted by the user in accordance with the difference in weight of the occupants. This balances the force of the seated person's weight with the repulsive force of the gas spring and compression spring, allowing the seated person to finely control the inclination angle of the seat and backrest while remaining seated. .

(Example) Embodiments of the present invention will be described based on the drawings.

Figures 1 and 2 show the framework of the chair with the cushions of seat A and backrest B removed. Figure 2 shows the gas springs, coils, etc. for simplicity and clarity. Springs, etc. are omitted.

Reference numeral 1 denotes a support body, and the support body 1 has a shape that extends forward from a base portion 1a that is fitted into a support column 2 and projects on both sides. Further, the support column 2 has a built-in gas spring (not shown) for moving the seat up and down.

Reference numeral 3 denotes a mounting frame, which has a link configuration for changing the seating posture of the seat portion A and the backrest B. The mounting frame 3 includes a seat support frame 4, a dogleg-shaped guide column 6, a link member 8 consisting of a connecting rod 8 and a bell crank 10,
Consists of 10 three members. Both projecting ends 1b, 1b of the support body 1 pivotally support the front ends of seat support frames 4, 4 with support shafts 5, 5, and the seat A is mounted on these seat support frames 4, 4.

The rear end of each support frame 4 is further pivotally supported by a pin 9 at a central bent portion 6a of a dogleg-shaped guide column 6, which constitutes one of the mounting frames. One side of a bell crank 10 is pivotally attached to the lower end of each guide column 6 by a shaft 11.

Furthermore, an operating lever 12 is provided at the center end of each support frame 4 to change the vertical movement of the seat A and the backrest angle.

The bell crank 10 is attached to the support body 1 via a support shaft 13, and is capable of swinging around the support shaft 13. A connecting rod 8 is connected to the other side of the bell crank 10, and a threaded rod 18 that pivots a pin 16 is attached to the tip of the connecting rod 8.

Further, a movable frame 20 to which a backrest B is attached is slidably inserted over the upright portions 6b, 6b of the guide columns 6, 6, and the operating rotary body 2 is inserted into the movable frame 20.
2 is rotatably mounted and screwed onto the threaded rod 18, so that the operating rotating body 22 is attached to the threaded rod 18.
When the movable frame 20 is moved up and down together with the operating rotating body 22 while being guided by the guide column 6, the backrest B can be moved to any desired position.

The tilting of the backrest B of a chair equipped with such a frame
The upright movement is performed using a gas spring 23, a compression spring 24 as a compression spring adjustment device, and an adjustment means 25 for changing the degree of compression of the spring.

As shown in FIG. 1, the tip 23a of the gas spring 23 is pivotally connected to the support 1 by a pin 26, and the actuating rod 27 extending from the gas spring 23 is located above the central bent portion 62 of the guide column 6. It is pivotally connected to by a pin 28.

The compression spring adjusting means 25 is disposed between the shaft 11 and a frame 31 rotatably provided at the tip of the support 1, and is capable of expanding and contracting the compression spring as will be described later. The compression spring adjusting means 25 has the following configuration.

A guide tube 30 formed integrally with a spring receiver 29 rotatably attached to the shaft 11 is loosely fitted with one end of a cylindrical rod 32 rotatably supported by a frame 31. A threaded portion 33 is formed at the end. A movable spring receiver 34 is screwed into this threaded portion 33, and a compression spring 24 is interposed between the movable spring receiver 34 and the spring receiver 29. Note that both ends of the compression spring 24 and each spring receiver 29, 34 are fixed by welding, or the end of the spring is bent and locked to each spring receiver 39, 34, so that the cylindrical rod 32 is fixed. The movable spring receiver 34 is designed not to rotate with rotation.

A bevel gear 35 is integrally attached to a portion of the cylindrical rod 32 that penetrates the frame 31, and the bevel gear 35 is attached to the frame 31.
1 and meshes with a bevel gear 36 rotatably supported by 1. The bevel gear 36 is integrated with a rotation knob 37 exposed on the lower surface of the front end of the seat.

Next, the operation of the compression spring 24 and the compression spring adjustment means 25 will be described.

When the rotary knob 37 is rotated in the direction of the arrow shown in FIG. 3, the bevel gear 36 integrated with the rotary knob 37
rotate in the same direction, and the bevel gear 35 integrated with the cylindrical rod 32 rotates clockwise when viewed from the spring receiver 29 side.

At this time, even if the cylindrical rod 32 rotates clockwise,
The movable spring receiver 34 elastically biased by the compression spring 24 does not rotate but moves on the threaded portion 33 of the cylindrical rod 32, contracts the compression spring 24, and approaches the spring receiver 29.

Therefore, when the rotary knob continues to be rotated, the movable spring receiver 34 comes into contact with the stopper ring 38, and
The compression spring 24 cannot be further compressed by moving the movable spring receiver 34 toward the shaft 11 side.

Conversely, when the rotation knob 37 is turned in the direction of the arrow shown in FIG. However, since the force of the movable spring receiver 34 rotating together with the cylindrical rod 32 is suppressed by the compression spring 24, it moves away from the shaft 11, that is, the biasing force of the compression spring 24 is weakened.

Due to the above action, when the seat A and the backrest B are tilted or raised, in addition to the predetermined repulsive force of the gas spring 23, by turning the rotary knob 37, a spring force corresponding to the weight of the seated person is applied. be able to.

Therefore, the force due to the weight of the seated person is balanced by the resultant force of the repulsive force of the gas spring 23 and the force of the compression spring whose compression degree is adjusted, so that the seated person can freely remain seated. You can easily operate it to fine-tune your sitting posture.

(Effect of the invention) As is clear from the above description, the present invention allows the movable frame attached to the rail portion of the guide column to be moved relatively downward along the rail portion by the link member in conjunction with the tilting of the guide column. This prevents the seated person's jacket or shirt that is in contact with the backrest from being lifted up.In addition to the repulsive force of the gas spring, the compression level of the spring is adjusted according to the weight of the seated person. applying thrust to a gas spring so that the person can adjust the posture of the seat and backrest while sitting through a mounting frame with a link configuration;
Moreover, the movable frame attached to the rail part of the guide column can be moved relative to the rail member by the link member in conjunction with the tilting of the guide column, and the height position of the backrest can be corrected by this movement amount, and the seat And the inclination angle of the backrest can be adjusted.

Furthermore, since a compression spring is provided in addition to the gas spring, the load applied to the gas spring is reduced and its lifespan is extended, and the set pressure of the gas spring can be lowered and the capacity itself can be reduced.

Furthermore, since the compression springs are adjusted on the user's side of the chair, the range of use due to differences in the weight of the seated person is wider compared to conventional chairs, and there is no need for troublesome movements such as shifting the weight such as lifting the hips. , and the operability is also good.

[Brief explanation of drawings]

Fig. 1 is a schematic side view of the configuration of an embodiment of the present invention, Fig. 2 is a perspective view showing the frame shown in Fig. 1, and Fig. 3 shows a state in which the biasing force of the compression spring used in the present invention is at its minimum. FIG. 4 is an enlarged partial cross-sectional view showing a state in which the biasing force of the compression spring shown in FIG. 3 is at its maximum. A...Seat, B...Backrest, 1...Support,
2... Support column, 3... Mounting frame, 5... Support shaft, 23...
...Gas spring, 24...Compression spring, 25...
Compression spring adjustment means.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) In a chair whose backrest tilts backwards as the rear end of the seat lowers around the pivot that supports the front end of the seat, the chair is fixed to the leg support 2. a mounting frame 3 movably attached to the support 1; a seat A and a backrest B provided between the support 1 and the mounting frame 3;
The mounting frame 3 includes a support frame 4 of the seat and a guide for a backrest that can swing around a shaft 9 pivotally supported at the rear end of the support frame. Compression spring adjustment devices 24, 25 whose one end side is connected to the backrest movable frame 20 attached to the rail portion 6b of the guide column 6 and whose other end side biases the gas spring 23 in the direction in which it expands. link members 8 and 10 connected to one end of the guide column 6 connected to the guide column, and the link member adjusts the amount of movement of the movable frame in conjunction with the tilting of the guide column. chair. (2) The compression spring adjusting device 24 and 25 are constructed by interposing a compression spring between a guide tube 30 of the spring receiver and a movable spring receiver 34 screwed to a shaft 32 that rotates via a rotation knob 37. A chair according to claim 1 of the utility model registration claim, characterized in that: (3) The movable frame 20 includes an operating rotating body 22 that is screwed into the threaded rod 18 connected to the link members 8 and 10, and the operating rotating body presets the position of the backrest along the rail portion 6b of the guide column. 2. A chair according to claim 1 or 2, characterized in that the chair is capable of being registered as a utility model.