JPH068007U - Castor - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention provides a caster that can freely move and stably fix furniture by changing the load on the furniture such as a chair. [Structure] An axle 5 of a traveling wheel 6 is movably attached to a vertically elongated hole 4 provided in a base 2, and the axle 5 is pressed downward by a coil spring 7. A shaft insertion hole 8 into which a mounting shaft 9 is rotatably fitted at a position eccentric to the axle 5 of the base 2.
To provide. In this structure, the traveling wheels 6 move the casters when no load is applied to the casters 1, and when a load is applied, the coil springs 7 are deformed and the base 2 is grounded to the floor surface.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This invention relates to casters for moving and fixing furniture such as chairs.

[0002]

[Prior art and its problems]

 Conventionally, casters attached to the legs of a chair have a function of freely moving the chair regardless of whether or not the person is sitting on the chair. When working with a chair, the movement of the casters easily causes the chair to wobble, which makes it difficult to perform the work.

On the other hand, it is conceivable that a wheel lock mechanism is provided on the caster and the movement of the caster is stopped by the lock mechanism after the wheel is moved to a required position. However, such a lock mechanism is troublesome to operate. At the same time, it has the drawback of complicating the caster structure and increasing the price.

In view of this, the present invention has a simple structure that allows the furniture to move freely in any direction while the human is not adding weight, while the furniture can be moved when the weight of the human is added. The purpose is to provide casters that can be stopped and stably fixed to the furniture.

[0005]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the present invention has a horizontal axle that rotatably supports traveling wheels attached to a base so as to be vertically movable, and urges the axle downward inside the base. The structure is such that an elastic member is incorporated and a shaft insertion hole into which the vertical mounting shaft is rotatably fitted is provided at a position eccentric to the mounting position of the axle on the base.

[0006]

[Action]

 In the caster of this invention, the lower end of the mounting shaft is fitted in the shaft insertion hole of the base, and the upper end of the mounting shaft is fixed and mounted on a chair of a chair or the like.

In this state, when the chair is moved by rolling the traveling wheels while the human weight is not applied to the chair, and a force in a direction different from the rolling direction of the traveling wheels acts on the base. Causes a rotational force between the mounting shaft eccentric from the mounting position of the wheel and the base, and the base rotates in a direction in which the acting force matches the rolling direction of the wheel. Therefore, the chair can be moved in any direction by rotating the base and rolling wheels.

On the other hand, when a human weight is applied to the chair, the elastic member is deformed, the bottom surface of the base is brought into contact with the floor, and the movement of the chair is fixed.

The caster of the present invention can be used not only for moving a chair but also for moving other furniture accompanied by load fluctuation.

[0010]

【Example】

 An embodiment of the present invention will be described below with reference to the accompanying drawings. 1 to 3, reference numeral 2 denotes a base of the caster 1, and the base 2 is made of a synthetic resin, wood, or the like and formed into a plate-like member having a predetermined thickness.

Inside the base 2, a spring fitting hole 3 that opens to the lower surface of the base is formed, and vertical holes 4 are formed on both wall surfaces of the spring fitting hole 3. ing. A horizontal axle 5 is movably fitted in the long holes 4, 4, and traveling wheels 6, 6 are rotatably attached to both ends of the axle 5 via bearings (not shown).

A coil spring 7 that pushes the axle 5 downward is incorporated in the spring fitting hole 3, and the elasticity of the coil spring 7 pushes the axle 5 against the bottoms of the slots 4 and 4. The traveling wheels 6, 6 are exposed from the lower surface of the base 2.

In this case, the elastic force of the coil spring 7 is determined in consideration of the weight of the furniture on which the casters 1 are mounted and the magnitude of the load applied to the furniture. For example, when the caster 1 is attached to the chair leg, the elastic force of the coil spring 7 is such that the spring hardly deforms only by the weight of the chair, and the spring deforms when a human weight is added to the chair. The size of the traveling wheel 6 is set so as to move above the bottom surface of the base 2.

A shaft insertion hole 8 is formed on the upper surface of the base 2 at a position eccentric to the mounting position of the axle 5 (position of the spring fitting hole 3), and the caster is inserted in the shaft insertion hole 8. The mounting shaft 9 is rotatably fitted.

When the caster 1 of the embodiment having the above structure is attached to the leg of the chair, the lower end of the attachment shaft 9 is inserted into the shaft insertion hole 8 of the base 2 as shown in FIG. Fix the upper end of the mounting shaft 9 to the leg A of the chair.

In such a mounted state, the base 2 is lifted from the floor surface B by the traveling wheels 6 and the chair is moved by rolling of the traveling wheels 6 while no human weight is applied to the chair. You can Further, when a force in a direction different from the rolling direction of the traveling wheels 6 acts on the casters 1, the mounting positions of the wheels 6 and the mounting shaft 9 are eccentric, so the above-mentioned acting force causes the base 2 and the mounting shaft 9 to move. Rotational moment is generated between them. Therefore, the base 2 rotates until the acting force and the rolling direction of the traveling wheels 6 coincide with each other, and when the two directions coincide, the rolling of the traveling wheels 6 causes the chair to move.

On the other hand, when a human weight is applied to the chair, the coil spring 7 is deformed, and the base 2 is lowered as shown by the chain line in FIG. As a result, the bottom surface of the base 2 is in contact with the floor surface B, and the movement of the chair is stopped.

Although the coil spring 7 is used as the elastic member for urging the axle 5 in the above embodiment, a spring material such as a disc spring or rubber may be used.

[0019]

【effect】

 As described above, the present invention has a simple structure in which traveling wheels and elastic members are simply attached to the base so that furniture can be freely moved and stably fixed, and the furniture can be freely moved and fixed. It has the effect of providing controllable casters at low cost.

[Brief description of drawings]

FIG. 1 is a partially longitudinal front view showing a caster according to an embodiment.

2 is a partially longitudinal side view taken along the line II-II in FIG.

FIG. 3 is an exploded perspective view of the caster of the same.

[Explanation of symbols]

 1 caster 2 base 3 spring fitting hole 4 long hole 5 axle 6 traveling wheel 7 coil spring 8 shaft insertion hole 9 mounting shaft

Claims (1)

[Scope of utility model registration request] 1. A horizontal axle for rotatably supporting traveling wheels is movably mounted on a base so as to be movable in the vertical direction, and an elastic member for urging the axle downward is incorporated inside the base. A caster in which a shaft insertion hole into which a vertical mounting shaft is rotatably fitted is provided at a position eccentric from the mounting position of the axle on the base.