JPH07171029A - Chair - Google Patents

Abstract

PURPOSE:To provide a chair which is designed to automatically rise a seat regardless of whether a back rest is movable or not and to deal with various specifications with a minor change of parts. CONSTITUTION:Plural supporting bodies 2 are erected apart required spacings. The seat 3 and the back rest are disposed between these supporting bodies 2. Both sides at the base end of the seat 3 are pivoted at the supporting bodies 2 via supporting shafts 5 and first rising levers 6 or second rising levers for pressing the seat 3 in an erecting direction are pivotally fitted to the supporting bodies 2 so that these rising levers 6 are energized in a direction of erecting the seat by springs 7 held in the supporting bodies 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chair having a rising function used as a chair for viewing.

[0002]

2. Description of the Related Art Conventionally, as this type of chair, there is known a chair in which a plurality of supports are erected at a predetermined interval and a seat and a backrest are provided between the supports. In this chair, both sides of the base end of the seat are pivotally supported by the support through a support shaft, and the backrest is held by the support so as to be able to move up and down, and the lower end of the backrest is set at the rear end of the seat. Generally, the seat is pivotally connected, and the seat can be pivotally urged in the upright direction by gravity acting on the backrest.

[0003]

However, when the seat is stood and the load on the seat is removed, the seat automatically rises and is folded up to a position where it overlaps with the front surface of the backrest. ing. However, the conventional one is
It is difficult to set the seat stop position due to automatic rising before the maximum standing position that is locked by the backrest, etc., and by simply locking the seat with the stopper, the seat can be further manually raised from the stop position to the maximum standing position. It will not be possible to stand up. Further, conventionally, a chair with a fixed backrest and a seat that only rises by spring force had to be designed as a completely different chair. Therefore, using the weight of the backrest to raise the seat to the maximum standing position, what raises the seat to a predetermined stop position by the weight of the backrest, or the backrest is fixed and only the seat rises, etc.
Chairs of various specifications have different structures, which makes it difficult to unify the designs and complicates the production, management, and assembly work of parts.

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 is a chair in which a plurality of supports are erected at a predetermined interval and a seat and a backrest are arranged between the supports, and both sides of a base end portion of the seat. Is pivotally supported on the support through a support shaft, and a rising lever for pressing the seat in the upright direction is pivotally attached to the support, and the rising lever is seated in the upright direction by a spring held by the support. It is characterized by being urged to.

In order to achieve a common design and a common structure between the automatic seat rising specification that stops before the maximum standing position and the automatic seat rising specification that positions the seat up to the maximum standing position A first rising lever configured to urge the seat to a maximum standing position without being locked, and locked to a support body before the seat reaches the maximum standing position, and cannot rotate. The second rising lever configured as described above may be selectively mounted.

In order to simplify the structure as much as possible, a boss portion is provided on the support body, a support shaft of the seat is rotatably fitted in a bearing provided in the boss portion, and an outer periphery of the boss portion is provided. It is preferable that the rising end of the rising lever is rotatably mounted, and the rising lever can be biased by a spring wound around the boss. In a particularly preferable mode in which such a configuration is adopted, the support has a locking wall in the vicinity of its boss portion, and the second rising lever has a locking piece that abuts against this locking wall. Can be mentioned.

In order to automatically raise by a biasing force of a spring up to a predetermined stop position and manually rotate the stop position to a maximum standing position, an engaging projection is provided on a side surface of a seat. It suffices if the seat is urged in the upright direction by a rising lever that is located further rearward than the engaging protrusion and is in contact with the engaging protrusion so as to be separable.

In order to particularly simplify the structure of the base end portion of the seat, the seat is provided with a seat body and plates attached to both sides of the base end portion of the seat body. It is preferable that the support shaft, the engaging protrusion, and the connecting pin are provided in advance, and the lower end of the backrest that can be moved up and down is pivotally connected to the connecting pin.

[0010]

With this structure, since the urging force of the spring is transmitted to the seat through the rising lever, the seat can be raised regardless of whether the backrest can be raised or lowered. . Moreover, since the seat is not directly urged by the spring, it is possible to change the stop position of the seat after rising and to automatically raise the seat to the maximum standing position simply by changing the form of this rising lever. It is also possible to manually rotate the stop position to the maximum standing position.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

In this chair, as shown in FIGS. 1 to 4, a plurality of supports 2 are erected at predetermined intervals in the chair width direction on a beam pipe 1 held at a predetermined height position on the floor. Then
A seat 3 and a backrest 4 are arranged between the respective supports 2. Then, the support shaft 5 is attached to both sides of the base end portion of the seat 3.
A first rising lever 6 for pressing the seat 3 in the upright direction is pivotally attached to the support body 2, and the rising lever 6 is held by the support body 2. The spring 7 urges the seat upright.

More specifically, the support 2 is tightly fixed to the beam pipe 1 by using a bolt (not shown), and an armrest 8 is rotatably attached to the upper end of the support 2 via a pin shaft 21. Has been done. As shown in FIGS. 4 and 5, the portion near the lower end of the support 2 has ribs 2 at the front and rear edges of the vertical wall portion 22.
3 has a plane cross section of H-shape, and bosses 24 are integrally formed on both surfaces of the vertical wall 22. The boss portion 24 has a cylindrical shape, and the bearing 2 is provided inside thereof.
5 is fitted, and a step portion 24a for mounting the rising lever 6 is formed on the outer circumference of the tip end portion. As shown in FIG. 5, the bearing 25 is a cylindrical body fitted and fixed to the inner periphery of the boss portion 24, and has a flange portion at its outer end for preventing the rising lever 6 from coming off. 25a. Further, at the inner end of the bearing 25, engaging recesses 25b and engaging claws 25c are alternately projected at predetermined intervals in the circumferential direction, and are provided on one surface side of the support body 2. The engaging claw portion 25c of the bearing 25 mounted on the boss portion 24 provided on the other surface side is elastically engaged with the engaging concave portion 25b of the bearing 25 mounted on the boss portion 24 thus formed. I'm holding out. A cover plate 28 is attached to the outer surface of the support 2 at both ends located at the end of the beam pipe 1.

The seat 3 comprises a seat main body 31 and metal plates 32 attached to both sides of the base end of the seat main body 31, and the support shaft 5 is attached to each of the plates 32.
An engaging projection 33 and a connecting pin 34 are provided so as to project, and the support shaft 5 is rotatably fitted into the bearing 25. The engagement protrusion 33 is a shaft-like member that is parallel to the support shaft 5 and is fixed to the plate 32 so as to be located rearward of the support shaft 5.

The backrest 4 is, for example, a hollow body made by blow molding or the like, and is held by the support 2 via a link member 41 so as to be able to move up and down. The link member 41 has bearings 42 and 43 at both ends. One of the bearings 42 is pivotally attached to the pin shaft 21 of the support 2, and the other bearing 43 is provided on the side surface of the backrest so as to project. Is anchored in. An arm portion 45 provided at the lower end of the backrest 4 is pivotally connected to the rear end portion of the seat 3 via the connecting pin 34.

As shown in FIGS. 4 and 5, the first rising lever 6 is made of sheet metal having a shaft hole 61 at its base end, and the shaft hole 61 is formed in the step portion 24a of the boss portion 24. It can be fitted and rotated freely. Tip 62
Is formed in a slender shape, and a seat 3 is formed at one side edge of the tip 62 of the seat 3.
The outer peripheral surface of the engaging projection 33 can be pressed. A recess 63 for engaging the spring 7 is provided on the other side edge of the rising lever 6.

The spring 7 is of a torsion coil type and is wound around the outer periphery of the boss portion 24. One end 71 of the spring 7 is fixed to the support 2, and the other end 72 is engaged with the recess 63 of the rising lever 6 to urge the rising lever 6 to rotate in the seat upright direction. .

The armrest 8 is downwardly U-shaped in cross section and is pivotally attached to the upper end of the support 2 through the pin shaft 21. The armrest 8 rotates in a direction in which the upper end rises when no external force acts. The center of gravity is set like this. When the free end link member 41 rotates upward due to the rise of the backrest 4, the free end link member 41 is pressed by the link member 41 and rotated to a horizontal use position.

With such a structure, when a load is applied to the seat by sitting, the seat 3 rotates in the horizontal direction against the urging force of the spring 7, and is shown in FIG. It is held in such a use position. At this time, the connecting pin 34 provided at the rear end of the seat 3 rises, so that the backrest 4 is lifted upward and the armrest 8 is in a horizontal posture. When the seat is lifted to release the load acting on the seat 3, the biasing force of the spring 7 is transmitted to the engaging protrusion 33 provided at the rear end of the seat 3 via the rising lever 6,
The engagement protrusion 33 is pressed downward. As a result, seat 3
Is rotated in the upright direction, the backrest 4 is lowered, and the seat 3 is superposed on the front surface of the backrest 4, as shown in FIG. In this embodiment, since the first rising lever 6 which can be freely rotated without being locked to the support body 2 is used, the seat 3 does not stop midway and the maximum standing position a. Rotate to. Since such a rising operation is caused not only by the weight acting on the backrest 4 but also by the urging force of the spring 7, even if a lightweight thing such as a blow-molded product is used as the backrest 4, the seat 3 is It is possible to surely stand up.

The embodiment shown in FIG. 6 to FIG.
Instead of the first rising lever 6 configured to urge the seat 3 to the maximum standing position a without being locked to the seat 3, the seat 2 is engaged with the support body 2 before the seat 3 reaches the maximum standing position a. The second rising lever 9 is configured so that it is stopped and cannot be rotated. The same or corresponding portions as those in the above-described embodiment are designated by the same reference numerals and the description thereof will be omitted. 6 to 11, the backrest 4 and the armrest 8 are fixed to the support body 2, and the backrest 4 and the seat 3 are separated from each other.

As shown in FIGS. 8 and 9, the second rising lever 9 is made of a metal plate having a shaft hole 91 at the base end, and the shaft hole 91 is formed in the step of the boss portion 24 of the support 2. Part 24a
It is adapted to be rotatably fitted to. The leading end 92 of the rising lever 9 is formed to be slender, and one side edge of the leading end 92 can press the outer peripheral surface of the engaging projection 33 of the seat 3. A locking piece 94 extending in the direction of the support 2 is integrally provided on one edge of the intermediate portion of the rising lever 9 so as to project. Then, as shown in FIG. 10, a locking wall 27 is integrally provided in the vicinity of the boss portion 24 of the support body 2, and the locking piece 27 of the rising lever 9 is brought into contact with the locking wall 27. The rotation of the rising lever 9 is locked. In this embodiment, when the seat 3 is at the stop position b as shown in FIG. 6, the locking piece 94 of the rising lever 9 is set so as to abut against the locking wall 27 of the support body 2 and be locked. Yes (see FIG. 10). Then, the other end 72 of the spring 7 is hooked in the recess 93 of the rising lever 9, and the spring 7 urges the rising lever 9 to rotate in the seat upright direction.

With such a structure, when the load acting on the seat 3 is released by standing up the seat, the urging force of the spring 7 is provided at the rear end of the seat 3 via the rising lever 9. It is transmitted to the engagement protrusion 33, and the engagement protrusion 33 is pressed downward. As a result, the seat 3 is rotated in the standing direction, and the stop position b shown in FIGS.
At, the locking piece 94 of the rising lever 9 abuts against the locking wall 27 of the support body and is locked. And then, seat 3
Automatically rises to the stop position b by the urging force of the spring 7. Since the tip end 92 of the rising lever 9 is in contact with the engaging projection 33 of the seat 3 so as to be able to come in and out of contact, the seat 3 held at the stop position b is pushed backward to It is possible to further rotate the seat 3 in the upright direction.
At the maximum standing position a indicated by the solid line, the seat 3 is locked by the engagement protrusion 33 of the seat 3 abutting against the rubber cushioning material 29 provided on the support 2.

In the case of this embodiment, the backrest 4 is fixed, and the gravity acting on the backrest 4 cannot be used at all, but the seat 3 can be reliably raised by the urging force of the spring 7. it can.

In the embodiment described above, the case where the second rising lever is used in a chair of a type having a fixed backrest has been described, but the present invention indicates that when the backrest is fixed, it is movable. It is applicable regardless of.

Further, the stop position defined by the second rising lever is not limited to that of the illustrated embodiment, but can be set at various angles by changing the shape and size of the rising lever. Is possible.

Further, the support is not limited to the one standing upright on the beam pipe, but may be fixed to a horizontal floor surface or a standing surface of a raised floor.

[0027]

As described in detail above, according to the present invention, since the urging force of the spring is transmitted to the seat through the rising lever, the seat is supported regardless of whether the backrest is movable or not. Can be raised. Moreover, according to the present invention, it is possible to appropriately change the stop position of the seat after the rising or to automatically raise the seat up to the maximum standing position by simply changing the form of the rising lever, and manually from the stop position. It is also possible to comply with the specification that can be appropriately rotated to the maximum standing position. Therefore, chairs of various specifications can be made to have substantially the same structure, the design can be made common, and the manufacture and management of parts can be simplified.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of the present invention.

FIG. 2 is a side view showing the same embodiment.

FIG. 3 is a side view for explaining the operation of the embodiment.

FIG. 4 is an exploded perspective view of a main part of the embodiment.

FIG. 5 is a front sectional view showing a main part of the embodiment.

FIG. 6 is a side view showing another embodiment of the present invention.

FIG. 7 is a side view for explaining the operation of the embodiment.

FIG. 8 is an exploded perspective view of a main part of the embodiment.

FIG. 9 is a partial side view showing an enlarged main part of the embodiment.

FIG. 10 is a side view corresponding to FIG. 9 for explaining the operation of the embodiment.

FIG. 11 is a side view corresponding to FIG. 9 for explaining the operation of the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Beam pipe 2 ... Support body 3 ... Seat 4 ... Backrest 5 ... Spindle 6 ... 1st rising lever 7 ... Spring 9 ... 2nd rising lever 24 ... Boss 27 ... Locking wall 31 ... Seat body 32 ... Plate 33 ... Engaging projection 34 ... Connecting pin

Claims (6)

[Claims] 1. A chair in which a plurality of supports are erected at a predetermined interval and a seat and a backrest are arranged between the supports, and a support shaft is provided on both sides of a base end portion of the seat. The supporting body is pivotally supported through the supporting body, and a rising lever for pressing the seat in the standing direction is pivotally attached to the supporting body, and the rising lever is biased in the seat standing direction by a spring held by the supporting body. A chair characterized by being. 2. A first rising lever configured to urge the seat to a maximum standing position without being locked to the supporting body, and to the supporting body before the seat reaches the maximum standing position. The chair according to claim 1, wherein a second rising lever configured so as to be unable to rotate is selectively mounted. 3. A boss portion is provided on the support body, a support shaft of the seat is rotatably fitted in a bearing provided in the boss portion, and a base end portion of the rising lever is rotated around the outer periphery of the boss portion. The chair according to claim 1 or 2, wherein the rising lever is rotatably biased by a spring that is mounted so that it can be wound around the boss. 4. The support body has a locking wall near the boss portion, and the second rising lever has a locking piece that abuts against this locking wall. The chair according to claim 2 or 3. 5. An engaging projection is provided on the side surface of the seat so as to be located rearward of the support shaft, and the seat is attached in the upright direction by a rising lever which is brought into contact with and separated from the engaging projection. 5. The method according to claim 1, 2, 3 or 4 characterized in that
The listed chair. 6. A seat comprising a seat body and plates attached to both sides of a base end portion of the seat body, the plate including the support shaft, the engaging projections, 6. The chair according to claim 5, wherein a connecting pin is provided, and a lower end portion of a backrest that can be raised and lowered is pivotally connected to the connecting pin.