JPH052122Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a chair equipped with a seat support and a back support that can be tilted backwards.

(Prior Art) Various types of chairs of this type are already known.

Figure 4 shows an example of this (see Japanese Utility Model Application Publication No. 154040/1983), in which the front end of the seat support 3 that supports the seat A is attached to the support 2 attached to the upper end of the support column 1. At the other end of the seat support 3, a middle portion of a back support 5 supporting a backrest B is rotatably fixed by a support shaft 6. Back support 5 is
One end of the bell crank 7 extending below the seat support is connected to a support shaft 8 at one end of the bell crank 7 which is pivotally connected to the support body 2.
As a result, when the seated person shifts their weight backward, the seat support 3 rotates around the spindle 4 and tilts backward, and the back support 5 follows this and tilts significantly backward. , the seated person can take a relaxing posture. A back plate 9 is slidably attached to the other end of the back support 5, and a link chain 10 is bridged between this and the bell crank 7. As a result, when the back support 5 tilts rearward, the bell crank 7 rotates, and the back plate 9 follows this and relatively descends on the back support 5, preventing the clothes of the seated person from being pulled upward. It is becoming more and more common.

By the way, such chairs are usually provided with biasing means for ensuring smooth tilting of the back support 5 and adjusting its inclination angle. 1
1 is one of them, a gas spring with a locking mechanism.
The proximal end is connected to the support 2, and the rod end is connected to the back support 5. This gas spring 11
is an operating section 12 provided on the side of the seat support 3.
The opening and closing of the valve is controlled by the operator, and the seated person can select a desired inclination angle by operating the operating section 12. However, when attempting to correct the excessive inclination angle of the lever, the repulsive force of the gas spring 11 is usually small, so it takes time to return to normal position, and in some cases, it may be necessary to remove the weight of the seated person. For this reason, a compression spring 13, which is another biasing means, is interposed between the support shaft 8 and the support body 2 on the front side of the seat. This compression spring 13 applies a rotational force in the return direction to the back support 5, and the spring pressure can be adjusted as appropriate by an adjustment device 14. The repulsive force of the compression spring 13 allows the seated person to adjust the inclination angle while leaning on the seat A, greatly improving operability.

(Problems to be Solved by the Invention) However, in the conventional chair described above, in addition to the gas spring 11, a relatively large compression spring 13 must be arranged around the support body 2, so the seat There was a problem in that the area under A became complicated, which not only restricted the movement of the legs of the seated person, but also impaired the design. Furthermore, in order to obtain the spring effect, the compression spring 13 must be arranged in the front-rear direction, and therefore the adjustment device 14 that adjusts the spring pressure can only be installed in the front-rear direction of the seat, resulting in poor operability. There was a problem. Furthermore, since the compression spring 13 generally has poor durability, there is also the problem that the degree of adjustment changes, making it difficult to obtain a constant repulsive force.

(Means for solving the problems) In order to solve the above-mentioned conventional problems, the present invention
A back support having a hollow horizontal rotating shaft fixed to the rear end of the seat support whose front end is rotatably supported by a support body is rotatably connected via the horizontal rotating shaft, and the seat support of the back support A gas spring with a locking mechanism for adjusting the inclination angle of the back support is interposed between one end extending downward and the support body, and a torsion bar is inserted into the horizontal rotation shaft, and one end of the horizontal rotation shaft is inserted. a pipe member having a lever is fitted to the outer periphery of the torsion bar, and the torsion bar and the pipe member are mutually non-rotatably coupled at one end of the torsion bar;
The torsion bar and the horizontal rotating shaft are mutually non-rotatably coupled at the other end of the torsion bar, and a lever having one end engaged with the lever is applied to one side of the seat support, and a rotational force is applied to the lever. The gist is that the configuration is such that an adjustment means is provided.

(Function) In the chair configured as described above, the torsion bar inserted into the horizontal rotating shaft applies rotational force in the return direction to the back support during reclining motion, so that the seated person can move his or her weight slightly on the seat. It becomes possible to easily fine-tune the inclination angle of the back support. Moreover,
Since the torsion bar is housed within the horizontal rotation axis, it is possible to eliminate interfering parts from under the seat, which not only allows for more freedom of movement for the seated person, but also improves the design of the chair. In addition, the strength of the repulsive force of the torsion bar can be adjusted while sitting using the adjustment means provided on the side of the seat, significantly improving operability.

(Example) Hereinafter, an example of the present invention will be described based on the accompanying drawings.

1 to 3 show the structure of a chair according to the present invention. In these figures, the same elements as those shown in FIG. 4 are given the same reference numerals, and their explanations will be omitted. In these figures, the seat support 3 and the back support 5 are rotatably connected to each other via a hollow horizontal rotating shaft 21 fixed to the back support 5. The back support 5 is formed by integrally connecting a pair of left and right shaft portions 5a extending above the seat support 2 and a fork portion 5b extending below the seat support 3, and the horizontal rotating shaft 21 is fixed to the fork portion 5b. There is. The tip of the fork portion 5b has one end pivoted to the support body 2 via a pivot shaft 22, and the other end of an arm 23 via a pivot shaft 24, which allows the back support 5 to move toward the rear of the seat support 3. It can follow the tilt and tilt backwards.

On the other hand, the link chain 10 includes a support guide 10a that holds the back plate 9 and a support guide 10a that holds the back plate 9.
Three links 10b, 10 connecting 0a to support 2
c, 10d, and the intermediate link 10c is the fork portion 5b of the back support 5.
The link 10 at the tip is pivoted on the support shaft 25 and
d is pivotally attached to the support body 2 with a shaft 26. As a result, when the back support 5 tilts backward, the link 10
b, 10c, and 10d rotate relative to each other, and the back plate 9 comes to relatively descend on the back support 5.

Here, the support guide 10a is provided with a stopper 27 for regulating the lowering of the back plate 9, and is also provided with a long hole 28 and circular holes 29, 29, . . . for positioning the back plate 9. A locking member 30 consisting of a pin 30a that can be fitted into the circular hole 29 and a shaft 30b that can be inserted into the elongated hole 28 is slidably housed in the back plate 9. This locking member 30 is always biased to the right in FIG. 1 by a compression spring 32 seated on a spring receiver 31 fixed to one end of the shaft 30b. If the spring receiver 31 is pushed in against the biasing force, the shaft 30
b is positioned within the elongated hole 28, and the back plate 9 is movable along the support guide 10a.
On the other hand, if the push-in of the spring receiver 31 is released during this operation, the pin 30a will fit into the circular hole 29 and the movable plate 9 will be fixed at an appropriate position.

The gas spring 11 is attached with its proximal end connected to a hinge bracket 2a which is pivotally attached to the support body 2, and its rod end connected to the support shaft 24, respectively. A bell crank 33 is pivotally attached to the hinge bracket 32, and the valve shaft 11a of the gas spring 11 is engaged with one end of the bell crank 33. At the other end of the bell crank 33 is a pull rod 34.
One end of the pull rod 34 is hung, and the other end of the pull rod 34 is connected to an L-shaped adjustment lever 35. The adjustment lever 35 extends through the support body 2 to below one side of the seat support 3, and includes an operation section (a fourth
(indicated by reference numeral 12 in the figure) are connected. That is, when the adjustment lever 35 rotates due to the operation of the operating section, the pull rod 34 moves forward and backward, and the bell crank 33 rotates following this, and the valve shaft 11b is rotated.
moves, the gas spring 11 opens and closes, and the inclination angle of the back support 5 can be adjusted as appropriate. In addition, this chair has a support (indicated by reference numeral 1 in Figure 4).
A means for adjusting the sitting height is provided, and an adjustment lever 36 thereof is disposed on the support body 2.

A torsion bar 37 having a hexagonal cross section is fitted into the horizontal rotation shaft 21 that connects the seat support 2 and the back support 5, and the torsion bar 37 and the horizontal rotation shaft 21 are made non-rotatable at one end 38. combined. On the other hand, a tube member 39 having a lever 39a is fitted onto the outer periphery of the horizontal rotating shaft 21 protruding to one side of the seat support 3, and the tube member 39 and the torsion bar 37 are made non-rotatable at the other end 40. combined.
In other words, when the back support 5 falls backward,
A repulsive force is generated in the torsion bar 37 to return the back support 5 to its original position.

The lever 39a extends forward through the bottom of one side of the seat support 3, and engages with one end of a lever 42 rotatably attached to the seat support 3 via a support shaft 41. On the other hand, a ball screw 44 is attached to the seat support 3 in a hanging state and screws into a horizontal shaft 43, and this horizontal shaft 43 is engaged with the other end of the lever 42. The ball screw 44 has a stopper 45 fixed to one end extending downward from the horizontal shaft 43 to prevent the horizontal shaft 43 from coming off, and a rotation knob 46 further below the stopper 45 . That is, when the rotation knob 46 is turned, the horizontal shaft 43 moves up and down, and the lever 4
2 rotates around the support shaft 41, and as a result, the lever 39a of the tube member 39 rotates, the rotational force is transmitted to the torsion bar 37 via the tube member 39, and the repulsive force of the torsion bar 37 is adjusted as appropriate. Become so.

With such a configuration, when a seated person shifts their weight backward, the seat support 3 rotates around the spindle 4 and tilts backward, and the back support 5 follows this.
It also leans significantly backwards. At this time, the seated person is seat A.
The operation part 12 on the side of the seat is operated to open and close the gas spring 11 and adjust the inclination angle of the back support 5. Since the force is generated, a rotational force in the return direction acts on the back support 5, and the seated person can finely adjust the inclination angle of the back support 5 by slightly shifting his/her weight, thereby achieving the desired reclining posture. can be taken.

Here, the repulsive force of the torsion bar 37 can be easily adjusted by the seated person extending his hand under the seat A and turning the rotation knob 46.
Further, when taking the reclining position, the back plate 9 relatively descends on the back support 5, so that the seated person can smoothly take a relaxed position without having his clothes pulled upward. Further, by simply pushing in the spring receiver 29, the fixed position of the back plate 9 relative to the back support 5 can be easily adjusted, making it possible to secure a more ideal seating posture.

In addition, in the above embodiment, the back support 5
Although the back plate 9 is slidably attached to the back support, it is also within the scope of the present invention to have the back plate fixedly attached to the back support. in this case,
Of course, the link chain 10 can be omitted.

(Effects of the invention) As explained above in detail, the present invention connects the seat support and the back support using a hollow horizontal rotation shaft, and within this horizontal rotation shaft, the back support is rotated in the return direction. Since a torsion bar is installed to apply force, it is possible to expand the space under the seat, which not only allows the occupant to move more freely, but also improves the design of the chair. Furthermore, since the strength of the repulsive force of the torsion bar can be adjusted while sitting using the adjustment means provided on the side of the seat, it is possible to provide a chair with high operability. Furthermore, since the torsion bar is more durable than conventional compression springs, it has the effect of making it possible to maintain stable operability. Also,
The simple structure of inserting the torsion bar into the horizontal rotating shaft and fixing both ends of the bar not only improves ease of assembly but also reduces costs.
Its effects are profound.

[Brief explanation of the drawing]

Figures 1 to 3 show the structure of the chair according to the present invention, where Figure 1 is a longitudinal sectional view, Figure 2 is a plan view, and Figure 3 is a front view as seen from arrow P in Figure 1. 4 are side views showing the structure of a conventional chair. 2...Support body, 3...Seat support, 5...
Back support, 11...Gas spring, 21...Horizontal rotating shaft, 37...Torsion bar, 39...Pipe member, 39a...Lever, 42...Lever, 44...
...ball screw, 46...rotation knob.

Claims (1)

[Scope of utility model registration request] A back support having a hollow horizontal rotating shaft fixed to the rear end of the seat support whose front end is rotatably supported by a support body is rotatably connected via the horizontal rotating shaft, and the seat support of the back support A gas spring with a locking mechanism for adjusting the inclination angle of the back support is interposed between one end extending downward and the support body, and a torsion bar is inserted into the horizontal rotation shaft, and one end of the horizontal rotation shaft is inserted. A pipe member having a lever is fitted to the outer periphery of the torsion bar, and at one end of the torsion bar, the torsion bar and the pipe member are mutually non-rotatably coupled, and at the other end of the torsion bar, the torsion bar and the horizontally rotating A chair characterized in that the shafts are mutually non-rotatably coupled, and a lever having one end engaged with the lever and an adjusting means for applying a rotational force to the lever are disposed on one side of the seat support. .