JPH0612105U - Chair casters - Google Patents

Abstract

(57) [Abstract] [Purpose] A movable member to which a wheel is attached is slidable up and down and rotatable with respect to a vertical retaining rod that is displaced laterally from the wheel rotation axis. The compression coil spring that pushes the movable member downward is externally fitted to the retaining rod, and the grounding portion of the chair floats in the non-seated state and forms the compression coil spring with the strength to ground in the seated state. In the chair caster described above, sufficient mounting strength of the movable member is ensured in a highly reliable state. [Structure] A retaining rod 5 is attached to a mounting member 4 for fixing to a chair, and a tubular portion 7 which is externally fitted on the upper portion of a compression coil spring 6 is formed on the mounting member 4, and the tubular portion 7 is provided.
And the movable member 3 is vertically slidably and rotatably fitted in the annular recess 8 formed on the mounting member 4 on the outer peripheral side thereof.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 INDUSTRIAL APPLICABILITY The present invention is used to easily move a chair when it is not seated, and to prevent the chair from moving unexpectedly when it is seated. A compression coil spring that vertically slides and pivotally fits on a vertically oriented retaining rod that is displaced in the horizontal direction, and a compression coil spring that urges the movable member downward is externally fitted on the retaining rod. The present invention relates to a caster for a chair, in which a compression coil spring is formed so that the grounding portion of the chair floats up in the non-seated state and is grounded in the seated state.

[0002]

[Prior art]

 Conventionally, in forming the 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 is inserted into the recess 22. The lower part of the compression coil spring 27 that urges the movable member 26 downward by screwing the movable member 26 to which the wheel 25 is attached and screwing the movable member 26 to the slip-off preventing member 24 in a vertically slidable and rotatable manner. A cylindrical portion 28 which is fitted to the outside is formed on the movable member 26, and the cylindrical portion 28 is fitted on the leg 21 so as to be vertically slidable and rotatable (see Japanese Utility Model Laid-Open No. 58-171704).

[0003]

[Problems to be solved by the device]

 However, since the fitting allowance of the tubular portion 28 with respect to the leg 21 is small and the tubular portion 28 of the movable member 26 is fitted into the recessed portion 22 of the leg 21, the fitting is restricted due to restrictions in manufacturing technology. The looseness of the joint portion is likely to be large, and therefore, excessive load is apt to act on the screwing portion of the retaining member 24 to cause rattling and damage, which causes a problem in reliability of mounting strength of the movable member 26. There was room for improvement in terms of improving durability. An object of the present invention is to ensure sufficient mounting strength of a movable member in a highly reliable state and to sufficiently improve durability.

[0004]

[Means for Solving the Problems]

 The characteristic structure of the present invention is that a movable member having a wheel mounted thereon is vertically slidably and rotatably fitted on a vertical retaining rod which is displaced laterally with respect to a rotation axis of the wheel. , The compression coil spring for urging the movable member downward is fitted onto the retaining rod so that the grounding part of the chair floats up in the non-seat state and also grounds in the seated state. In the chair caster, the retaining rod is attached to the attachment member for fixing to the chair, and the tubular portion that fits over the upper part of the compression coil spring is formed on the attachment member. The movable member is vertically slidably and rotatably fitted in the annular recess formed in the mounting member.

[0005]

[Action]

 That is, for example, as shown in FIG. 1, a tubular portion 7 extending downward and an annular recess 8 located on the outer peripheral side thereof are formed in the mounting member 4, and the tubular portion 7 and the annular recess 8 are provided with a part of the movable member 3. Since 9 is fitted, the fitting allowance between the movable member 3 and the mounting member 4 can be made sufficiently larger than that of the conventional technique described above, and the mounting member 4 separate from the chair has a retaining rod shape. Since the body 5 is attached and the movable member 3 is fitted, it is technically easy to surely fit the movable member 3 and the mounting member 4 in a state without rattling or very little before assembling them to the chair. Therefore, sufficient mounting strength of the movable member 3 can be secured in a highly reliable state, and durability can be sufficiently improved.

[0006]

[Effect of device]

 As a result, the chair casters, which make it easy to move the chair when it is not seated and prevent the chair from moving unexpectedly when it is seated, have been made more reliable in terms of strength and more durable. did it.

[0007]

【Example】

 As shown in FIG. 1, the wheel 1 is rotatably attached to the movable member 3 around the support shaft 2, and the retaining rod 5 is attached to the attaching member 4 for fixing to the chair by screwing or the like to move the wheel. The member 3 is fitted onto the vertically extending retaining rod 5 which is displaced laterally from the axis of rotation of the wheel 1 so as to be vertically slidable and rotatable, and the movable member 3 is urged downward. The compression coil spring 6 is externally fitted to the retaining rod 5, and the tubular portion 7 which is externally fitted to the upper portion of the compression coil spring 6 is formed on the attachment member 4, and the tubular portion 7 is mounted on the outer peripheral side of the tubular portion 7. And the annular recess 8 is formed in the attachment member 4, and the tubular fitting portion 9 of the movable member 3 is fitted in the tubular portion 7 and the annular recess 8 so as to be vertically slidable and rotatably movable. The compression coil spring 6 has a strength that allows the grounding part of the vehicle to float in the non-seated state and to ground in the seated state. It is formed. 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 11 grounded as shown in FIG. , The wheel 11 can easily move the chair 11, and when sitting, the compression coil spring 6 is compressed and deformed by the weight as shown in FIG. 2 to prevent the chair 11 from unintentionally moving by landing the grounding portion 12a of the chair 11. It is configured so that it can be done. The mounting member 4 is also used as a cover so that the movable member 3 and the wheel 1 are almost contained within the mounting member 4 as shown in FIG. 2, and as shown in FIG. The mounting member 4 is provided with a pair of projections 13 to be fitted to the mounting member 4, and the mounting member 4 can be firmly connected to the leg 12 by means of a screw stop 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.

It should be noted that reference numerals are added to the claims of the utility model 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 11 chair 12a grounding 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, wherein the retaining rod (5) is attached to an attachment member (4) for fixing to the chair (11), A tubular portion (7) externally fitted on the compression coil spring (6) is formed on the attachment member (4), and the attachment member (4) is located at the tubular portion (7) and its outer peripheral side. ), The movable member (3) is placed on the annular recess (8) formed in Caster chair that is not slide and rotatably fitted.