JPH05344919A - Chair - Google Patents

Abstract

PURPOSE:To mitigate oppression to a thigh part without causing complicated operation and complication of structure by providing a swinging plate pivoted to a seat bracket supported on a leg swingably forward and rearward within a fixed angle range, an elastic body for energizing the swinging plate turnably rearward, and a seat fitted onto the swinging plate. CONSTITUTION:When a load is applied to a position directly above a leg 1 of a seat fitted onto a swinging plate 3 and rearward thereof, in a state of being unused or used, a front edge part of the swinging plate 3 is energized upward by an elastic body 4 and the swinging plate 3 is locked to a repose attitude position (m) about 2 deg. inclined rearward relative to the horizontal. When a gravity center of a user is moved forward, a load is applied to a position forward of a pivot 35 of the swinging plate 3, and the swinging plate 3 is thereby tilted forward against energizing force of the elastic body 4 with the pivot 35 as a swinging center to be locked to a working attitude position (n). In this case, the seat and the swinging plate 3 are inclined forward about 4 deg. relative to the horizontal. With this constitution, oppression to a thigh part can be mitigated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chair used in offices and the like.

[0002]

2. Description of the Related Art As a chair used in an office or the like, a chair having a seat fixed to a seat support or a seat supported so that it can swing back and forth with respect to the seat support and locked at a desired angular position. There is known a device which can be fixed by a mechanism.

[0003]

However, in the case where the seat is completely fixed, the angle of the seat does not match the posture in either the working posture or the rest posture, and the thigh has a feeling of pressure. There is a problem. In addition, it is possible to cope with various postures by changing the angle of the seat and fixing it with a lock mechanism, but it is also necessary to adjust the angle of the seat every time the angle of the backrest is changed and the posture is changed. Therefore, the operation becomes complicated. Further, there is a problem that the structure is complicated because it is necessary to internally install the lock mechanism.

An object of the present invention is to eliminate such a problem.

[0005]

The present invention takes the following means in order to achieve such an object. That is, the chair according to the present invention includes a seat support supported on the legs, a swing plate pivotally supported by the seat support so as to be able to swing back and forth within a certain angle range, and the swing plate is rotated rearward. It is characterized by comprising an elastic body for urging and a seat mounted on the swing plate. The backrest is preferably pivotally attached to the seat rest. In this case, it is preferable to dispose a reaction force unit for biasing the backrest, which is independent of the elastic body, in the seat support.

In order to reduce the feeling of pressure on the thigh in both the working posture and the resting posture as much as possible, the rocking plate is swung so that the seat can be tilted beyond the horizontal position to the forward tilted position. It is desirable to set the movable range. As an aspect for such a configuration, the rocking plate is pivotally supported by a support shaft located on an extension of the center line of the leg and arranged in a direction orthogonal to the center line, and the elastic body is It is preferable that the oscillating plate is sandwiched between the oscillating plate and the bottom wall of the seat support in the approximate center in the width direction and in front of the center line.

[0007]

With this construction, when the load acting on the seat moves forward, the seat tilts forward against the repulsive force of the elastic body due to the load, and when the load moves backward, the seat moves. Tilts backward due to the urging force of the elastic body. As a result, the thigh compression should be kept to a minimum in both the working position where the weight is applied relatively to the front side of the seat and the rest position where the weight is applied to the back side of the seat. You can Moreover, this seat operation is performed automatically when the posture is changed from the working posture to the resting posture, or when the posture is changed from the resting posture to the working posture, due to the movement of the weight accompanying the change. There is no need to operate a special lever or the like, and the seat does not tilt unless the weight is moved, so there is no need for a special locking mechanism, and therefore there is no complexity of operation or complication of the structure. .

[0008]

An embodiment of the present invention will be described below with reference to FIGS.

The chair shown in FIG. 1 has a seat support 2 supported on a leg 1, a swing plate 3 pivotally supported by the seat support 2 so as to be swingable back and forth within a certain angle range, and the swing plate. An elastic body 4 for urging the device 3 to rotate backward and a seat 5 mounted on the rocking plate 3 are provided.

As shown in FIG. 2, the seat support 2 has a boss portion 22 into which a main shaft 11 (FIG. 3) of the leg 1 is fitted on a bottom wall 21, for example, a flat casing type made of glass resin or the like. The base end portion 61a of the back support rod 61 is pivotally attached to the rear end portions of the side walls 23 of the seat support 2 via a support shaft 62. A through hole 24 for attaching the rocking plate 3 is formed on each of the side walls 23 on a straight line orthogonal to the center of the boss portion 22. The seat 5 is formed so as to become lower at an inclination angle corresponding to the inclination of the seat 5. Work holes 25 for attaching the seat 5 to the swing plate 3 are formed at the front and rear ends of the side walls 23. A recess 26 having an inner diameter substantially the same as the outer diameter of the elastic body 4 is formed in the central portion in the width direction near the front edge of the bottom wall 21, and the elastic body 4 is mounted on the inner periphery thereof. A plurality of vertical ribs 27 are integrally formed.

A back support rod 6 pivotally attached to the rear ends of the side walls 23.
As shown in FIG. 2, an arm 63 extending forward and downward is integrally formed with the base end portion 61a of the first base member 61a. The lower edge of the arm 63 should come into contact with a stopper provided on the seat support 2. Thus, the backrest 6 is locked at the standing locking position s. Thus, the backrest 6 can be tilted from the standing locking position s toward the rearward tilt position t. Then, a movable support point q is set at an arm tip position deviated from the pivot point p in the base end portion 61a of the back support rod 61, and the movable support point q and the stationary support point r set on the seat support 2 side are set. A reaction force unit 7 that urges the backrest 6 in the upright direction by an elastic repulsive force in the extension direction is interposed between the and.

The reaction unit 7 comprises a coil-shaped compression coil spring 71 and a pair of mount members 8 and 9 for holding the ends of the compression coil spring 71, respectively. One of the mount members 8 has a locking surface that locks the end surface of the compression coil spring 71, and is integrally projected from this locking surface and has an outer diameter substantially equal to the inner diameter of the compression coil spring 71. A boss portion to be inserted into the boss portion, and a pin shaft portion integrally protruding from the tip of the boss portion and having a small diameter near the boss portion. The other mount member 9 has a locking surface for locking the end surface of the compression coil spring 71, and is integrally projected from this locking surface and has an outer diameter substantially equal to the inner diameter of the compression coil spring 71. And a boss portion to be inserted into the boss 71, and the boss portion is provided with a cavity into which the pin shaft portion of the mount member 8 is slidably fitted.

In such a reaction force unit 7, when the backrest 6 is tilted rearward from the standing locking position, one end of the arm 63 of the back support rod 61 causes one mount member 8 of the reaction force unit 7 to move to the other end. By pressing in the direction of the mount member 9, the compressive force is applied to the reaction force unit 7. as a result,
The compression coil spring 71 is compressed to increase the repulsive force, and the repulsive force elastically urges the backrest 6 in the upright locking position direction. Therefore, when the pressing force for tilting the backrest 6 rearward is released, the backrest 6 is returned to the original standing locking position by the repulsive extension force of the reaction unit 7. In this reaction force unit 7, when expanding and contracting,
Since the pin shaft portion is slidably guided in the cavity of the mount member 9, the mount members 8 and 9 come into contact with and separate from each other along the axis, and the compression coil spring 71 does not buckle.

The oscillating plate 3 is made of sheet metal, and mounting holes 31 through which bolts are inserted when the seats 5 are mounted are formed near the four corners of the oscillating plate 3, and side portions thereof are bent to form pivotal support portions 32. A shaft hole 33 is formed corresponding to the through hole 24. A convex portion 34 that engages with the inner peripheral surface of the elastic body 4 made of a compression coil spring is formed on the back surface in front of the shaft hole 33 at the center in the width direction. The convex portion 34 may be formed by pressing a sheet metal material from above.
The swing plate 3 is attached in the following order after the back support rod 61 and the reaction force unit 7 are attached to the seat support 2.
First, the elastic body 4 is placed on the vertical rib 27 in the recess 26 of the seat support 2, and the convex portion 34 on the back surface of the swing plate 3 is fitted to the upper end portion of the elastic body 4. Then, the rear end portion of the swing plate 3 is placed on both side walls 23 of the seat support 2. In this state, the shaft hole 33 of the swing plate 3
Since the through hole 24 of the side wall 23 and the through hole 24 of the both side walls 23 are positioned on a substantially straight line, the support shaft 35 is inserted from the through hole 24 of the one side wall 23,
The remaining axial hole 33 and the through hole 24 penetrate. Then, the end of the support shaft 35 protruding by penetration is fixed with a nut (not shown), and the mounting work is completed. The rocking plate 3 is attached in a state of being tilted rearward from the horizontal by about 2.0 ° (backward tilt). When the rocking plate 3 is tilted forward against the biasing force of the elastic body 4, Tilted at an angle of about 4.0 ° with the horizontal. The rearwardly tilted position and the forwardly tilted position are in the swingable range of the rocking plate 3 by the upper surfaces 23a of the side walls 23 of the seat support 2 so that the seat 5 can be tilted beyond the horizontal position to the forward tilted position. It is decided by setting. In this way, with respect to the swing plate 3 swingably attached to the seat support 2, a bolt is inserted into the attachment hole 31 of the swing plate 3 through the working hole 25 of the seat support 2 to attach the seat 5 to the seat 5. The seat 5 is attached to the oscillating plate 3 by mounting the pedestal on the oscillating plate 3 and then tightening the respective bolts.

The seat 5 is a seat plate 52 fixed to the swing plate 3.
And the cushion material 53 attached to the upper surface of the seat plate 52
Consists of. The seat plate 52 is attached to the rocking plate 3 so as to cover the upper portion of the seat support 2 at the central portion of the lower surface thereof, and elbows 51 are fixed to both sides of the central portion.

With such a structure, the seat 5 is not in use, and in a state in which a load is applied to the rear of the seat 5 including the position directly above the leg 1 when the seat 5 is used, the seat 5 is As shown in FIG. 3, the elastic body 4 urges the front edge portion of the oscillating plate 3 upward, so that the oscillating plate 3 is tilted backward at an angle of about 2.0 ° with respect to the horizontal at a resting posture position m. Since they are locked, they are also held in a state of being tilted backward at an angle of about 2.0 ° with respect to the horizontal (shown by the solid line in FIG. 1). This state is when the user is in a resting posture at the time of use, and since the center of gravity of the user is at a position acting behind the seat 5, the thigh of the user is pressed. Minimize what you do. From this resting state, when the center of gravity of the user moves forward in order to take a working posture, the seat 5 and the rocking plate 3 move to a position directly above the leg 1, that is, a position forward of the support shaft 35 of the rocking plate 3. Since the load is applied, the rocking plate 3 moves the elastic body 4 around the support shaft 35 as a rocking center as shown in FIG.
It tilts forward against the urging force of and is locked at the work posture position n. And if you are still working,
However, as shown by an imaginary line (dashed-dotted line) in FIG. 1, since it is tilted forward by about 4.0 ° with respect to the horizontal, the pressure on the thigh is relieved. As described above, the seat 5 (the swing plate 3) swings only by moving the upper body and moving the center of gravity when the user changes the posture from the working posture to the rest posture or vice versa. When any one of the postures is once held, the center of gravity does not move back and forth around the support shaft 35, so that the tilted state is held forward or backward.

The present invention is not limited to the embodiment described above, and the position of the support shaft 35 that pivotally supports the swing plate 3 may be rearward of the leg 1. In this case, it is preferable that the urging force of the elastic member 4 is slightly larger than that of the above-mentioned embodiment, because the braking force suitable for the swing of the seat 5 is exhibited.

In addition, the configuration of each part is not limited to the illustrated example, and various modifications can be made without departing from the spirit of the present invention.

[0019]

As described in detail above, according to the present invention, the seat angle can be changed by only changing the posture from the working posture to the rest posture or vice versa without performing another tilting operation. This allows the thigh pressure to be relieved regardless of the posture. Further, since the swing plate that can swing back and forth within a certain angle range is only biased by the elastic body so as to swing backward, the structure can be simplified, and therefore the number of parts can be reduced. Therefore, the number of assembling steps can be shortened.

[Brief description of drawings]

FIG. 1 is a partially omitted side view showing an embodiment of the present invention.

FIG. 2 is an exploded perspective view showing a main part of the embodiment.

FIG. 3 is a side view showing the internal structure of the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Leg 2 ... Seat support 3 ... Oscillating plate 4 ... Elastic body 5 ... Seat 6 ... Backrest 7 ... Reaction force unit 21 ... Bottom wall 35 ... Spindle

Claims (5)

[Claims] 1. A seat support supported on a leg, a swing plate pivotally supported by the seat support so as to be capable of swinging back and forth within a constant angle range, and an elastic member for biasing the swing plate backward. A chair comprising a body and a seat mounted on the rocking plate thereof. 2. The chair according to claim 1, wherein a backrest is pivotally attached to the seat support. 3. The chair according to claim 2, wherein a reaction force unit for biasing the backrest, which is independent of the elastic body, is arranged in the seat support. 4. The chair according to claim 1, wherein the swingable range of the swing plate is set so that the seat can be tilted beyond the horizontal position to the forward tilted position. 5. The swing plate is located on an extension of the center line of the leg,
Also, the elastic body is pivotally supported by a support shaft arranged in a direction orthogonal to the center line, and the elastic body swings with the bottom wall of the seat support at the approximate center in the width direction of the swing plate and in front of the center line. The chair according to claim 1 or 4, wherein the chair is held by a board.