JPH0910060A - Rotating device for chair or the like - Google Patents

Abstract

PURPOSE: To easily and properly attach a cover to a mounted body, and prevent the attached cover from rattling. CONSTITUTION: A vertical shaft 5 is held within a support cylinder 4 erected on a pedestal, so as to be freely rotatable around the axial line thereof, and a mounting body 6 such as a chair is fixed to the shaft 5. In addition an engagement projection 8a formed on a cylindrical cover 8 concealing the shaft 5, is coupled to an engagement hole 6d formed on the body 6. Thereby the cover 8 can easily be attached to the body 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chair in which a vertical support shaft for supporting a seat or the like is rotatably provided in a support cylinder erected on a pedestal of a chair, and a surrounding space is covered with a cover. Etc. relating to a rotating device.

[0002]

2. Description of the Related Art For example, in a support tube erected on a pedestal of a chair,
There is a gas spring that supports a seat portion and the like so as to rotate the seat portion and the like by rotatably supporting the gas spring around its axis. In such a device, when the gas spring is exposed to the outside, it not only damages the appearance but also
Since there is a risk that the user's clothes or the like will come into contact therewith and become dirty, the gas spring or the like is usually covered with a cylindrical cover.

As a conventional technique for such a cover, Japanese Utility Model Publication No. 62-4204 or Japanese Utility Model Publication No. 50-175.
There is one described in JP-A-21. 62-42
In JP-A-04-2004, a cover is suspended by locking an inward locking piece provided on the upper end of a cylindrical cover on the lower surface of a step provided at the middle part of the gas spring. In Japanese Utility Model Publication No. 50-17521, a mounting body fixed to a gas spring and a cylindrical cover are fixed to each other with bolts.

[0004]

[Problems to be Solved by the Invention] Jitsuko Sho 62-4204
The one disclosed in the publication has a drawback that the attached cover is rattling because the cover is simply suspended.
In addition, in Japanese Utility Model Publication No. 50-17521, the work of fixing the cover to the mounting body is troublesome, and if the cover is accidentally fixed to the mounting body while tilted, when the gas spring is expanded and contracted. In addition, the cover and the gas spring may come into contact with each other, which may cause an unpleasant sound or the operation of the gas spring may not be smooth.

The present invention has been made in view of the above-mentioned problems of the prior art, and the cover can be easily and reliably fixed to the mounting body, and the mounted cover does not rattle. The object is to provide a rotating device such as a chair.

[0006]

According to the present invention, the above-mentioned problem is solved as follows. (1) A vertical support shaft is rotatably supported in a support cylinder erected on a stand leg, and an attachment body for supporting a seat portion and the like is provided above the vertical support shaft. The cover is fixed to the mounting body by fitting the engaging protrusion provided on the cylindrical cover that covers the mounting body into the engaging hole provided in the mounting body, and at least the upper portion of the cover and the support cylinder is fixed. Polymerize.

(2) In the above item (1), at least the lower portion of the mounting body is formed in an annular shape, and the annular portion and the upper portion of the cover are overlapped with each other, and the engaging hole and the engaging hole are formed in the opposing surfaces of the mounting body and the cover. Providing an engaging protrusion.

(3) In the above item (1) or (2), the vertical support shaft is a gas spring, and the cover is overlapped with at least the upper portion of the support cylinder when the gas spring is maximally extended.

(4) In any one of the above items (1) to (3), a reduced diameter step portion is formed on the outer periphery of the lower end portion of the mounting body, and the engagement hole is formed on the side surface of the reduced diameter step portion. The upper end surface of the cover is brought into contact with the upper end surface of the reduced diameter step portion when the engaging projection is fitted into the engaging hole.

(5) In any one of the above items (2) to (4), the cover is molded from an elastically deformable material, and the inner diameter of the overlapping portion with the mounting body is determined from the outer shape of the overlapping portion of the mounting body. Try to be slightly larger.

(6) In any one of the above items (1) to (5), the upper portion of the engaging projection is a guide portion whose projection amount gradually decreases as it goes upward.

[0012]

The cover can be fixed to the mounting body only by fitting the engaging projection of the cover into the engaging hole of the mounting body, and the vertical support shaft can be prevented from being exposed to the outside. Further, there is little risk that the fixed cover will rattle.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention (the inventions of all claims) is applied to a chair whose seat portion can rotate will be described below with reference to the accompanying drawings.

(1) is integrally molded so as to have a radial shape in a plan view by connecting the base ends of a plurality of four to five leg rods (only two are shown in FIG. 1) (1a). With the base, each leg rod
A caster (2) is provided at the tip of (1a).

A lower portion of a substantially cylindrical support tube (4) is fitted in a mounting hole (3) which vertically penetrates the center of the base leg (1). Both the inner surface of the mounting hole (3) and the lower outer surface of the support tube (4) are downward taper surfaces that are slightly reduced in diameter downward so that the load of the support tube (4) can be supported by the base leg (1). You can get it at.

A large part of a known gas spring (5) is housed inside the support cylinder (4), and the upper end of the movable part (5a) of the vertical support shaft of the gas spring (5) is located inside the support cylinder (4). It projects above the upper end.

When the push button (5a) provided on the upper surface of the movable portion (5a) of the gas spring (5) is pushed, the movable portion (5a) is moved to the support cylinder.
It can be expanded and contracted vertically with respect to (4) (Fig. 1
Shows the state when the gas spring (5) is maximally shortened).
The movable part (5a) can freely rotate around a vertical axis with respect to a holding part (not shown) fixed in the support cylinder (4).

The outer periphery of the upper end of the movable portion (5a) of the gas spring (5) is an upward taper surface which is slightly reduced in diameter upward, and a seat portion (not shown) or the like is supported on the upper portion thereof. Mounting hole (6) formed in the center of the mounting body (6)
(7) is fitted.

Thus, the movable part of the gas spring (5) is
Since the fitting surfaces of (5a) and the mounting body (6) are both tapered surfaces, the mounting body (6) does not come off from the gas spring (5) unnecessarily.

An annular portion (6a) concentric with the attachment hole (7) is continuously provided at the lower portion of the attachment body (6), and the outer periphery of the lower half portion of the annular portion (6a) is compressed. A step portion (6b) is formed.

As shown in FIG. 2, circular engaging holes (6) are formed at positions on the outer peripheral surface of the diameter-reduced stepped portion (6b) which are in a 180 ° relationship with each other.
c) (6c) is bored, and the same circular engaging projections (8a) (8a) provided on the inner surface of the upper end portion of the cylindrical cover (8) are provided in the engaging holes (6c) (6c). The cover (8) is attached to the attachment body (6) by fitting the.

When the gas spring (5) is shortened, the cover (8) overlaps with the upper half of the support tube (4), and the gas spring (5)
When it is extended, the gas spring (5) and the upper part of the support cylinder (4) overlap with each other, and the engaging protrusions (8a) (8a) are engaged with the engaging holes (6c) (6c).
The upper end surface of the reduced diameter step (6b) when fitted to
It comes into contact with (6d).

Since the inner diameter of the upper end portion of the cover (8) which overlaps with the reduced diameter step portion (6b) is slightly larger than the outer diameter of the reduced diameter step portion (6b), both engaging protrusions (8a) ( The cover (8) can be externally fitted to the reduced diameter stepped portion (6b) while elastically deforming the upper portion of the cover (8) into an elliptical shape so that 8a) is located on the major axis of the ellipse. After fitting the protrusions (8a) (8a) into the engagement holes (6c) (6c), the cover (8) can return to the original perfect circular shape.

It is preferable to provide a guide portion (8b) on the upper half portion of the engaging projections (8a) (8a) whose projection amount gradually decreases as it goes upward. Protrusion (8a) (8
The a) can be fitted into the engagement holes (6c) (6c) without any difficulty, and the work of attaching the cover (8) to the attachment body (6) can be smoothly performed.

According to this embodiment, the engaging protrusion (8
The cover (8) can be easily fixed to the mounting body (6) by a simple operation of fitting the a) and (8a) into the engagement holes (6c) and (6c). Further, when the cover (8) is fixed to the mounting body (6), the upper end surface of the cover (8) and the upper end surface (6d) of the reduced diameter stepped portion (6b) are in contact with each other. (8) There is no risk of rattling. In the present embodiment, the movable part (5a) of the gas spring (5) is used as the vertical support shaft, but a simple vertical rod may be used instead. In this case, the height of the seat part cannot be adjusted. become unable.

[0026]

According to the present invention, the following effects can be obtained. (a) The cover can be fixed to the mounting body by a simple work of fitting the engagement protrusion into the engagement hole, and the vertical support shaft and the like are not exposed.
There is no risk of the user's clothes, etc. being touched and dirty (all claims).

(B) According to the second aspect of the invention, since the annular portion of the mounting body and the cover overlap, the possibility that the cover will rattle can be reduced.

(C) According to the third aspect of the invention, the height of the seat portion and the like supported by the mounting body can be adjusted, and even if the height is increased, the gas spring is exposed to the outside. Since it is not exposed, there is no danger of the user's clothes or the like touching and getting dirty.

(D) According to the structure of the fourth aspect, since the upper end surface of the cover and the upper end surface of the reduced diameter step portion of the mounting body contact each other, the cover fixed to the mounting body does not rattle.

(E) According to the structure as claimed in claim 5, the cover can be easily fitted to the mounting body while the upper portion of the cover is elastically deformed into an elliptical shape or the like, and the engaging protrusion is engaged. After fitting into the hole, the cover returns to its original shape, which is convenient.

(F) With the structure according to the sixth aspect, the engagement protrusion can be fitted into the engagement hole without difficulty, and the work of attaching the cover to the attachment body can be smoothly performed.

[Brief description of the drawings]

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

FIG. 2 is an enlarged sectional view taken along line II-II of FIG.

[Explanation of symbols]

 (1) Base leg (1a) Leg rod (2) Caster (3) Mounting hole (4) Support cylinder (5) Gas spring (5a) Movable part (vertical support shaft) (5b) Push button (6) Mounting body ( 6a) Annular part (6b) Reduced diameter step part (6c) Engagement hole (6d) Upper end surface of step part (7) Mounting hole (8) Cover (8a) Engagement protrusion (8b) Guide part

Claims (6)

[Claims] 1. A vertical support shaft is rotatably supported in a support cylinder erected on a stand leg so as to be rotatable about its axis, and an attachment body for supporting a seat portion or the like is provided above the vertical support shaft. By fitting an engagement protrusion provided on a tubular cover covering the support shaft into an engagement hole provided on the attachment body, the cover is fixed to the attachment body, and at least the cover and the support tube are provided. A rotating device for chairs, etc., characterized by having the upper part polymerized. 2. At least a lower portion of the mounting body is formed into an annular shape,
2. The rotating device for a chair or the like according to claim 1, wherein the annular portion and the upper portion of the cover are overlapped with each other, and the engaging hole and the engaging protrusion are provided on the opposing surfaces of the attachment body and the cover. 3. The chair according to claim 1, wherein the vertical support shaft is a gas spring, and the cover is overlapped with at least an upper portion of the support cylinder when the gas spring is maximally extended. Rotating device. 4. A reduced diameter step portion is formed on the outer periphery of the lower end portion of the mounting body, and the engagement hole is formed in a side surface of the reduced diameter step portion, and the engagement protrusion is fitted into the engagement hole. The rotating device for a chair or the like according to any one of claims 1 to 3, wherein the upper end surface of the cover is brought into contact with the upper end surface of the reduced diameter step portion in doing so. 5. The cover is molded from an elastically deformable material, and the inner diameter of the overlapping portion with the mounting body is slightly larger than the outer shape of the overlapping portion of the mounting body.
A rotating device such as the chair according to any one of 4 above. 6. The rotating device for a chair or the like according to claim 1, wherein an upper portion of the engaging projection is a guide portion in which the amount of projection gradually decreases as it goes upward.