JPS5934902A - Caster - Google Patents

Abstract

PURPOSE:To prevent the deformation of a wheel based on mechanical load by setting up a reinforcing ring so that an annular guide groove is formed outside the boss section of a bearing block and fitting a guide ring on the wheel side to the guide groove in the caster for an OA apparatus. CONSTITUTION:The guide ring 20 of a wheel 13 is fitted to the guide groove 18 formed between the boss section 16 of a bearing block 10 and a reinforcing ring section 17, and a boss section 19a is brought into contact with the side end surface of the boss section 16 of the bearing block 10. Consequently, the guide rings 20 are turned in the grooves 18 when each wheel 13 is rotated. According to such a constitution, not only biased load is applied between a shaft hole 19 and an axle 12 but also the guide ring 20, the reinforcing ring 17 and the boss section 16 share and receive the load when vertical load and biased load are applied. As a result, the displacement of the wheel to mechanical load can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a caster, and more particularly to a caster that can mechanically prevent displacement of wheels constituting the caster due to load.

For example, casters used in OA (office automation) equipment are required to withstand the heavy load of the equipment and have a good design, so so-called twin-wheeled casters made of plastic wheels are used. .

Conventionally, for example, as shown in FIG.
Bearing block 2 attached to the bottom plate surface of the OAa device via
and a wheel 4.4 made of a plastic injection molded body, which is mounted on both ends of the shaft hole 2b of the boss portion 2a formed on both sides of the lower part of the bearing block 2 through the axle 3. A bearing block 2 is provided on the periphery of the central shaft hole 4a.
A boss portion 4b is formed opposite to the boss portion.

However, the above-mentioned OAI equipment etc. are generally heavy and are usually fixed in a fixed position. Therefore, the wheels 4 of the casters are provided with a stopper and fixed in a fixed position, and if necessary, The structure is such that it can be moved by unlatching this stopper.

Therefore, a static load G is always applied to this type of caster in the direction shown in the figure when each wheel 4 is in a stationary position.
An extremely strong force was applied between the wheel 4 and the boss portion 4b of the wheel 4, causing the shaft hole 4a to wear out on one side, and not only the vertical force G but also the diagonal force being applied. In some cases, a partial displacement occurs between the axle 3 and the shaft hole 4a of the wheel 4, and the resin near the shaft hole 4a becomes sagging, causing the wheel 4 to tilt in any direction.
This may cause the vehicle to become unable to run smoothly.

As a countermeasure for this, the wall thickness of the wheel 4 may be increased,
Alternatively, it is possible to increase the rigidity of the wheel itself by increasing the diameter of the boss portion 4b, but in this case, Ki 1? The star is extremely large, and the hardness and rigidity of the plastic material itself cannot be increased, so 7J is not very effective.

This invention has been made in view of the problems of conventional casters as described above, and its purpose is to:
The purpose is to mechanically prevent displacement of the wheel due to load.

In order to achieve the above object, the present invention provides a caster comprising a bearing block attached to the bottom of a device and a wheel rotatably attached to the bearing block via an axle. A boss part has an axle hole formed in its center through which the axle is inserted, and a concentric reinforcing ring part is installed around the outer periphery of this boss part. An annular guide is installed between the reinforcing ring part of the lever and the boss part. A groove is formed in the center of the wheel, and a shaft hole into which the axle is fitted is provided in the center of the wheel, and a guide ring is formed concentrically on the outer periphery of the shaft hole and fits into the annular groove of the bearing block in a concave and convex manner. One embodiment of the present invention will be described in detail below with reference to the drawings.

In FIG. 2, the dual-wheel caster according to the present invention includes a bearing block 10, and an engineering plastic or the like rotatably mounted on both sides of the bearing block 10 through an axle 12 in a shaft hole 11 formed in the lower part of the bearing block 10. It consists of wheels 13.13 made of synthetic resin injection molded bodies.

The bearing block 10 is made of, for example, an aluminum precision casting, and has a mounting hole 10a in the vertical direction on the bottom side of the machine body (not shown) for mounting a take-up shaft (to be described later). A brake plate 14 and a horizontal wind 15 for a clutch are provided on the distal end side of the brake plate 14, and the horizontal wind 15 for the clutch moves toward the center of the shaft hole by turning the brake plate 14.

Further, around the outer circumference of the shaft hole of the shaft block 10, a concentric boss portion 16 is integrally protruded on the left and right sides thereof, and on the outer periphery of the boss portion 16 there is a reinforcing ring portion 17 concentric with the shaft hole. are integrated.

, and an annular kite groove 18 is formed between the reinforcing ring portion 17 and the boss portion 167.

A boss part 19'l is formed in the inner center of each wheel 13, and a shaft hole 19 for fitting the axle 12 is formed in the center of the boss part 19a. There are 21 concentric guide rings (protruding) around the outer circumference of the hole, which are attached to the sword.
On the outside and inside lower part of the D guide ring 20, clutch grooves 21, which are removably engaged with the four flat pawls 15, are provided protruding at predetermined intervals. Reinforcement frame for reinforcing the meat handling part 23.23・
... are integrally formed.

In addition, 24 in the figure is an end cap located on the outer side of each wheel 13 for covering the protruding end of the axle 12 from the outside;
12a is an E-ring for fixing the axle.

FIG. 3 shows a state in which a wheel is attached to the wheel 10 constructed as described above (1=bearing block E1), and 25 is the above-mentioned mounting shaft. The end face of the boss portion 19a of the wheel 13 is in contact with the side end face of the boss portion 16 of the bearing block 10, and a guide ring 20 formed on the outer periphery thereof
are projected into the guide groove '18 and fitted in a concave and convex shape, so that when each wheel 13 rotates, the guide ring 20 moves into the groove '18.
Therefore, when a load G or an unbalanced load in the vertical direction is applied to the dual-wheel caster configured in this way, the shaft hole of the wheel 13 will rotate 19 degrees. Not only is an unbalanced load applied only between the wheels 12, but the guide ring 20 is also applied to the inner circumferential surface of the reinforcing ring portion 17 of the bearing block 10 or the boss portion 16.
By coming into contact with the outer periphery of the cylinder, the load G or unbalanced load is shared and received.

As explained above with reference to the embodiments, in the caster according to the present invention, the guide ring portion is integrally provided on the outer periphery of the boss portion of the wheel and protrudes from the concentric guide groove formed on the outer periphery of the shaft hole of the bearing block. Because the wheels are rotatably fitted together, the displacement between the axle and the wheel is reduced by the guide ring, compared to the conventional system in which the wheel is simply rotatably attached to the bearing block via the axle. This has various advantages such as substantially increasing the rigidity of the wheel and being able to withstand high loads in the negative direction.

[Brief explanation of drawings]

Figure 1 is a partial cutaway showing a conventional twin-wheel caster. 2 is an exploded perspective view of the caster according to the present invention, and FIG. 3 is a partially cutaway sectional view showing the caster in an assembled state. 11... Shaft hole 12... Axle 13... Wheel 16... Boss portion 17... Reinforcement ring portion 18... Guide groove 19... Shaft hole 20... Guide ring patent Applicant Nanshin Rubber Industries Co., Ltd.

Claims (1)

[Claims] (1) In a caster consisting of a bearing block attached to the bottom of a device and a wheel rotatably attached to the bearing block via an axle, the bearing block has a shaft through which the axle is inserted through the center of the caster. A concentric reinforcing ring part is provided around the outer periphery of the boss part in which the hole is formed, and an annular guide groove is formed between the reinforcing ring part and the boss part. A caster comprising: a shaft hole into which the axle is fitted; and a guide ring protruding concentrically from the outer periphery of the shaft hole and fitting into the annular groove of the bearing block in an uneven manner.