JPH0541449U - Bellows mounting structure for the chair support - Google Patents

Abstract

(57) [Summary] [Purpose] A seat plate is rotated by a gas cylinder etc. No sliding noise is generated at this time, and the bellows itself is not deformed even if the seat plate is rocked back and forth. [Structure] The leg (5) is erected, the seat beam (2) for attaching a seat plate is attached to the upper end, and the shoulder portion (15) set at the upper part and below the lower surface of the seat beam is attached. A supporting shaft (1) having the supporting shaft (1) and an annular member made of a synthetic resin, and a locking edge (21) for locking the shoulder portion of the supporting shaft is formed in the central portion, and an engaging projecting edge (23) is provided around the periphery. And the lower surface (19) of the seat beam is formed on the upper surface.
An upper mounting member (3) in which a plurality of bullet pieces (24) that are in contact with each other are arranged in an annular shape and stand upright, and an annular engaging edge (3) that engages with an engaging projecting edge of the upper mounting member at the upper end ( 27) is formed, and comprises a stretchable bellows (4) capable of covering the support shaft.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a bellows mounting structure in which a seat plate is height-adjustable by a gas cylinder or the like, and covers a column of a chair that is rotatable and rocks back and forth.

[0002]

[Prior Art]

 Conventionally, as shown in FIG. 4, a rocking mechanism 103 is mounted on a seat receiving beam 102 in which a seat plate (not shown) is attached to the upper end of a support shaft 101 having a vertically adjustable height, which is composed of a gas cylinder standing on a leg 100. Various chairs having a structure in which a flexible bellows 104, which is mounted via a support shaft 101 and covers a column including the support shaft 101, is mounted between a leg 100 and a seat beam 102, are provided. The seat beam 102 has a slightly larger opening 105 formed therein so that the support shaft 101 can be inserted therethrough and can be locked, and a metal locking ring is formed on the lower surface 106 of the seat beam 102 at the rim of the opening 105. 107 was welded, a connection ring 108 made of synthetic resin was rotatably attached to the locking ring 107, and the upper end of the bellows 104 was engaged with the connection ring 108.

However, when the seat receiving beam 102 is rotated with respect to the support shaft 101, a sliding noise is generated between the locking ring 107 and the connection ring 108, and when the front and rear are locked, the bellows is generated. Unnecessary bending may occur between the 104 and the connection ring 108, and the bellows itself may be bent, and repeated locking may damage the bellows.

[0004]

[Problems to be solved by the device]

 In view of the above situation, the present invention is to solve the problem that no sliding noise is generated when the seat plate is rotated, and the bellows itself is deformed even if the seat plate is rocked back and forth. The point is to provide a bellows mounting structure for no chair stanchions.

[0005]

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention has a bellows-mounting structure that covers a column of a chair whose height can be adjusted by a gas cylinder or the like. Attach the seat receiving beam to the seat and attach the seat receiving beam to the support shaft. The support shaft has a shoulder portion that is set above and below the bottom surface of the seat receiving beam, and an annular member made of synthetic resin. An engaging edge for engaging with the shoulder of the seat is formed, and an engaging projecting edge is formed on the periphery, and a plurality of bullets that abut the lower surface of the seat receiving beam are arranged in an annular shape on the upper surface. And a bellows of a chair strut that includes an upper mounting member and a ring-shaped engaging edge that engages with an engaging protruding edge of the upper mounting member and that can extend and contract to cover the support shaft. The mounting structure was configured.

[0006]

[Action]

 According to the bellows mounting structure of the chair strut of the present invention having the above-mentioned contents, the upper mounting member is locked with the shoulder formed at the upper portion of the support shaft which is erected on the leg with the locking edge at the center thereof. , A plurality of projecting pieces arranged in a ring on the upper surface are attached in contact with the lower surface of the seat receiving beam on which the seat plate is mounted, and the bellows are formed on the engaging edge formed around the upper mounting member. When the seat plate is rotated, the tip of the bullet slides on the lower surface of the seat receiving beam in a line contact state, so that the sliding sound is generated. Moreover, when the seat plate is rocked back and forth, the bullet pieces are deformed to suppress the deformation of the bellows itself.

[0007]

【Example】

 The present invention will be further described in detail with reference to the embodiments shown in the accompanying drawings.

FIG. 1 shows an abbreviated vertical sectional view of a chair according to the present invention, and FIGS. 2 and 3 show the main parts thereof, in which 1 is a support shaft, 2 is a seat beam, and 3 is an upper mounting member. 4 shows the bellows respectively.

In the chair according to the present invention, a metal shaft cylinder 6 is erected at the center of a leg portion 5 composed of a plurality of radial support legs integrally made of synthetic resin, and the shaft cylinder 6 is provided above the shaft cylinder 6. A slider rod cylinder 7 made of synthetic resin is fitted inside, and a cylinder rod 9 of a gas cylinder 8 is slidably inserted into the slider barrel cylinder 7, and a piston rod extending downward from the cylinder cylinder 9 is retractable. A lower end of 10 is rotatably or non-rotatably attached to the lower end of the shaft cylinder 6, and a seat receiving beam 2 having a seat plate (not shown) is attached to the upper end of the cylinder 9 via a locking mechanism 11. ..

In this embodiment, the support shaft 1 is the cylinder 9 itself, but a chair having a structure in which the vertical height can be adjusted without using the gas cylinder 8, for example, the side surface of the support shaft 1 inserted in the shaft cylinder 6. Similarly, the support shaft 1 of the chair is structured in such a manner that the recesses are formed vertically at regular intervals and the tip of the screw shaft of the adjusting member screwed from the side of the shaft cylinder 6 is pressed into the recess to be fixed. It is applicable.

A bellows 4 is attached using an upper mounting member 3 and a lower mounting member 12 to a column portion including a support shaft 1 and a shaft tube 6 of a chair having a vertically adjustable structure as described above. , Covering its outer circumference.

More specifically, the upper end of the support shaft 1 is attached to the locking mechanism 11 so as to form a fitting portion 14 that has a tapered taper diameter with respect to the lower base portion 13, and the base portion 13 and the fitting portion 14 An arcuate shoulder 15 is formed at the boundary of the. The locking mechanism 11 is provided inside the seat receiving beam 2, a connecting member 17 is swingably mounted between the support portions 16 on both sides, and the supporting shaft 1 is provided at the center of the connecting member 17. A connecting cylinder 18 for receiving the fitting is provided, and the lower end of the connecting cylinder 18 projects downward from an opening 20 formed in the lower surface 19 of the seat receiving beam 2. When the connecting member 17 swings (rocks), the lower end of the connecting tube 18 can move within the opening 20, so that the opening 20 extends in the front-rear direction or is oval or large. It is said to be circular. Further, the shoulder portion 15 is set so as to be located slightly below the lower surface 19 of the seat beam 2.

As shown in detail in FIGS. 2 and 3, the upper mounting member 3 is made of synthetic resin and integrally molded in an annular shape, and has a tapered locking edge 21 with a diameter reduced downward in the center. And a plurality of flat strip-shaped bullets 24 are formed on the upper surface and slightly inward of the step 22 on the upper surface. ... are erected in a circular arrangement, and those located at 45 ° intervals among the ammunition pieces 24, ... are longer than others and slanted slightly from the inside to the outside. The contact claws 25, ... are provided, and the other ends are the cover claws 26 ,. Here, the inner diameter of the locking edge 21 is set to be larger than the diameter of the fitting portion 14 of the support shaft 1 and smaller than the diameter of the base portion 13, that is, so as to abut the arcuate surface of the shoulder portion 15. ing. The slits between the bullets 24, ... Are set as narrow as possible so that the inside can be hidden. Each of the bullet pieces 24 has a sufficient elasticity so that it can be easily bent and can be surely restored, and the sliding contact claw 25 has its tip further bent outward in a substantially V-shaped cross section. There is.

The bellows 4 is made of synthetic rubber in a hollow shape, and has an upper end formed with an engaging edge 27 that is fitted onto the engaging projecting edge 23 of the upper mounting member 3 and engages with the step portion 22 in a retaining manner. The lower end is similarly fitted to the lower mounting member 12 which is externally fitted and fixed to the upper end of the leg portion 5. When the bellows 4 is mounted between the upper mounting member 3 and the lower mounting member 12, the dimensions are set so that the bellows 4 is always in a compressed state, that is, the lower end is connected to the leg 5 via the lower mounting member 12. Since it is fixed, the upper mounting member 3 is kept in pressure contact with the lower surface 19 of the seat beam 2 by utilizing its restoring force.

Then, with the upper mounting member 3 inserted into the fitting portion 14 of the support shaft 1 and the locking edge 21 being locked to the shoulder portion 15, the fitting portion 14 is connected to the connecting cylinder of the locking mechanism 11. When it is fitted into 18 to be mounted, and the engaging projection edge 23 and the step portion 22 of the upper mounting member 3 are engaged with the locking edge 21 at the upper end of the bellows 4 to be mounted, the bullet pieces 24 of the upper mounting member 3 ,. Is pressed against the lower surface 19 of the seat beam 2. In this case, the four sliding contact claws 25, ... Deform and the tips of the cover claws 26 ,. In this state, when the seat plate, that is, the seat receiving beam 2 is rotated, the sliding contact claws 25, ... Slid on the lower surface 19 thereof, and when the seat plate is rocked back and forth, the above-mentioned relative to the spindle 1 The lower surface 19 swings, and the sliding contact claws 25, ..., And the cover claws 26, ... Deform accordingly, but the sliding contact claws 25 and the cover claws 26 keep the spindle 1 substantially hidden.

[0016]

[Effect of the device]

 The bellows mounting structure of the chair strut of the present invention as described above is a bellows mounting structure that covers the strut of a chair whose height can be adjusted by a gas cylinder or the like, and is erected on the leg part and the seat plate at the upper end. Is attached to the seat receiving beam, and the support shaft has an upper portion and a shoulder portion set below the lower surface of the seat receiving beam, and an annular member made of synthetic resin. A locking edge is formed to lock the section, and an engaging projecting edge is formed on the periphery, and a plurality of bullets that come into contact with the lower surface of the seat receiving beam are arranged in an annular shape on the upper surface. Since the upper mounting member and the annular engaging edge that engages with the engaging protruding edge of the upper mounting member are formed at the upper end, and the expandable bellows that can cover the support shaft, the seat plate is rotated. When it is moved, the tip of the above-mentioned bullet slides on the lower surface of the seat receiving beam in a line contact state, so that a sliding noise is generated. In addition, when the seat plate is rocked back and forth, the bullet pieces deform and suppress the deformation of the bellows itself to prevent the bellows from being damaged. Can also hide the spindle.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a chair according to the present invention with some parts omitted.

FIG. 2 is a perspective view of an upper mounting member.

[FIG. 3] Similarly, a central longitudinal sectional view

FIG. 4 is a vertical cross-sectional view of a chair showing a conventional bellows mounting structure with a part thereof omitted.

[Explanation of symbols]

 1 support shaft 2 seat receiving beam 3 upper mounting member 4 bellows 5 legs 6 shaft cylinder 7 slider cylinder 8 gas cylinder 9 cylinder 10 piston rod 11 locking mechanism 12 lower mounting member 13 base portion 14 fitting portion 15 shoulder portion 16 support portion 17 connection Member 18 Connection tube 19 Lower surface 20 Opening 21 Locking edge 22 Step 23 Engaging projecting edge 24 Bullet piece 25 Sliding contact claw 26 Cover claw 27 Engaging edge

Claims (1)

[Scope of utility model registration request] 1. A bellows mounting structure for covering a column of a chair whose height can be adjusted by a gas cylinder or the like, in which a seat receiving beam for mounting a seat plate on the upper end is attached to the upper part of the bellows. A supporting shaft having a shoulder portion set below the lower surface of the seat beam, and an annular member made of synthetic resin, and a locking edge for locking the shoulder portion of the supporting shaft is formed in the central portion, Has an engaging projection edge, and has an upper mounting member on the upper surface of which a plurality of bullet pieces that are in contact with the lower surface of the seat receiving beam are vertically arranged in an annular manner, and an upper mounting member at the upper end of the upper mounting member. A bellows mounting structure for a chair column, comprising an expandable bellows which can form a ring-shaped engaging edge that engages with the joint edge and can cover the support shaft.