JPH0746562Y2 - Chair casters - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used to easily move a chair when not sitting and prevent the chair from moving unexpectedly when sitting. A compression coil spring that pushes the movable member downward is attached to the rotation axis of the wheel. The present invention relates to a caster for a chair, which is externally fitted to a working rod, and in which a compression coil spring is formed to have a strength such that a grounding portion of a chair floats in a non-seated state and grounds in a seated state.

[0002]

2. Description of the Related Art Conventionally, in forming a caster for a chair, as shown in FIG. 4, a recess 22 having a downward opening is formed in a leg 21 of the chair, and a retaining member 24 having a grounding portion 23 at a lower end thereof is provided. A compression coil which is inserted into the recess 22 and screwed to the leg 21, and the movable member 26 to which the wheel 25 is attached is vertically slidably and rotatably fitted to the retaining member 24 so as to urge the movable member 26 downward. The movable member 26 is formed with a tubular portion 28 that fits under the spring 27, and the tubular portion 28 is attached to the leg 21.
Was vertically slidably and rotatably fitted to the
No. 171704).

[0003]

[Problems to be solved by the invention] However, in the past, chairs have been used.
The child leg 21 itself has a downward opening concave portion 22 and the concave portion 2
Since the screw hole that opens to 2 is formed directly,
It is easy to be restricted by manufacturing technology such as fixing the legs and aligning
As a result, the accuracy of processing the recess 22 and the screw hole varies.
Depending on the key, the concave portion 22 and the tubular portion 28 of the movable member 26 are
Rattling of the fitting part is likely to increase, and moreover, the leg 21
For Hamagodai of the tubular portion 28 is small, easily retaining excessive looseness or breakage load acts on the screw portion of the member 24 occurs, the reliability in mounting strength surface of the movable member 26 issues against There was room for improvement in terms of durability. In addition, the recess 22 formed in the leg 21 of the chair itself
And the retaining member 24, the compression coil for the screw hole
Assemble movable member 26 with spring 27 and wheels 25 attached
Because of the relationship, when modifying an existing chair,
Many manufacturing processes such as hole processing and screw processing are required.
There was a problem that it took a lot of time to build. An object of the present invention is to provide a structure in which the upper part of the compression coil spring is externally fitted and held.
A reasonable devised utilizing the mounting strength of sufficient movable member can be secured in a reliable state, fully countercurrent durability
It is possible to improve the quality of the existing chair and
In terms of being able to easily remodel with no hassle
is there.

[0004]

A feature of the present invention is that a movable member to which a wheel is attached is vertically slid with respect to a vertical retaining rod that is displaced in the lateral direction with respect to the rotation axis of the wheel. It is movably and rotatably externally fitted, and the compression coil spring for urging the movable member downward is externally fitted to the retaining rod, and the grounding part of the chair floats up in the non-seated state and grounds in the seated state. In a chair caster having a strong compression coil spring, the upper part of the retaining rod is attached to a mounting member fixed to the chair.
A mounting section may, before a state located on the outer peripheral side of the mounting portion
The cylindrical fitting part formed on the upper part of the movable member slides vertically and
Thereby forming an annular recess for rotatably fitted, the cylindrical portion fitted around the upper portion of the compression coil spring, its
The outer peripheral surface of the is continuous with the inner peripheral surface of the annular recess on the small diameter side.
Projects downward from the peripheral edge of the annular recess of the mounting member
Has been formed .

[0005]

[ Operation ] In other words, the upper part of the compression coil spring is kept fitted.
The outer peripheral surface of the holding cylindrical portion is the inner peripheral surface on the small diameter side of the annular recess.
From the opening peripheral edge of the annular recess of the mounting member
It is formed so as to project downward, and extends over the tubular portion and the annular recess.
The vertical fitting part formed on the top of the movable member.
The movable member and the mounting member
The mating allowance of can be made sufficiently large compared to the above-mentioned conventional technology.
It Moreover, it is a mounting member that is separate from the chair to prevent it from coming off.
Fit the movable part and the attachment part to the upper part of the rod.
Since the annular concave portion and the cylindrical portion for forming are formed,
To fix the legs during processing, align the core, etc.
It is technically easy to fit the movable member and the mounting member to the chair without any rattling or extremely little rattling before assembling the movable member and the mounting member to the chair. The strength can be secured in a highly reliable state and the durability can be sufficiently improved. Besides, the chair
The retaining member, the compression coil
Pre-assembled movable member with le spring and wheels
Therefore, when modifying an existing chair,
As in the past, it is not necessary to machine recesses and screw holes in the legs one by one.
All that is required is to fix the mounting member to the leg.

[0006]

As a result, a chair caster for easily moving the chair when not sitting and preventing the chair from moving unexpectedly when seated is highly reliable in terms of strength and is more durable. Can be improved to be excellent
Also, you can easily modify existing chairs with little effort.
be able to.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a wheel 1 is rotatably attached to a movable member 3 around a support shaft 2, and an upper portion of a retaining rod 5 is screwed to an attaching member 4 for fixing the wheel 1 to a chair. Mounting part a for mounting with a stopper, etc. and the outside of this mounting part a
Cylindrical fitting that is located on the peripheral side and is formed on the upper part of the movable member 3.
An annular recess 8 into which the part 9 is fitted so as to be vertically slidable and rotatable.
And the movable member 3 is fitted onto the vertical retaining rod 5 which is displaced in the lateral direction with respect to the rotation axis of the wheel 1 so as to be vertically slidable and rotatable. The compression coil spring 6 for urging the lever downward is fitted onto the rod body 5 for retaining.
And further fit over the compression coil spring 6.
The outer peripheral surface of the cylindrical portion 7 is the inner peripheral surface 8 on the small diameter side of the annular recess 8.
The annular recess 8 of the mounting member 4 is opened in a state of being continuous with a.
The cylindrical fitting portion 9 of the movable member 3 is formed so as to project downward from the peripheral edge of the mouth, and is vertically slidably and rotatably fitted into the cylindrical portion 7 and the annular recess 8.
Have been combined. In addition, the compression coil spring 6 is
The grounding portions such as the legs of the chair are formed to have a strength to float in a non-seated state and to ground in a seated state .
That is, the caster 10 is attached to the leg 12 of the chair 11 as shown in FIG. 3, and when not seated, the wheel 1 grounded as shown in FIG. 1, the chair 11 can be easily moved, and when sitting, the compression coil spring 6 is compressed and deformed by the weight as shown in FIG. 2 so that the ground contact portion 12a of the chair 11 can be prevented from accidentally moving. Configured. The mounting member 4 is also used as a cover so that the movable member 3 and the wheel 1 are almost housed inside the mounting member 4 as shown in FIG. 2, and as shown in FIG. A pair of protrusions 13 to be fitted are provided on the mounting member 4 so that the mounting member 4 can be firmly connected to the leg 12 by means of a screw fastening using the hole 14.

[Other Embodiments] The materials and shapes of the mounting member 4 and the movable member 3 can be appropriately changed, and the connecting structure of the mounting member 4 to the chair 11 can be appropriately selected. The type of the chair 11 to which the casters 10 are attached does not matter.

In the claims of the utility model, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a caster in a non-seated state

FIG. 2 is a sectional view of the caster in a seated state.

FIG. 3 is a perspective view of a caster in use.

FIG. 4 is a sectional view of a main part of a conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 wheel 3 movable member 4 mounting member 5 retaining rod 6 compression coil spring 7 tubular portion 8 annular recess 8a small diameter side inner peripheral surface 9 tubular fitting portion 11 chair 12a grounding portion a mounting portion

Claims (1)

[Scope of utility model registration request] 1. A movable member (3) having a wheel (1) attached thereto.
Is vertically slidably and rotatably fitted externally on a vertical retaining rod (5) which is laterally displaced from the rotation axis of the wheel (1), and the movable member (3). ) Is pressed onto the retaining rod (5) so that the grounding portion (12a) of the chair (11) floats up in a non-seated state and in a seated state. A caster for a chair, in which the compression coil spring (6) is formed to have a strength to be grounded, which is fixed to the chair (11) .
A mounting portion (a) for mounting the upper portion of the retaining rod (5) on the mounting member (4) to be fixed, and the mounting.
The movable member (3) in a state of being located on the outer peripheral side of the portion (a)
The cylindrical fitting part (9) formed on the upper part of the table slides up and down and rotates.
While forming an annular recess (8) that fits freely,
Cylindrical shape that fits over the compression coil spring (6)
The outer peripheral surface of the portion (7) is on the smaller diameter side of the annular recess (8).
The attachment member (4) is continuous with the inner peripheral surface (8a).
Is formed so as to project downward from the peripheral edge of the opening of the annular recess (8).
Caster for that chair.