JP3085953U - Casters and casters - Google Patents

Abstract

(57) [Summary] [PROBLEMS] A caster body made of a synthetic resin having a bottomed mounting hole for mounting by inserting the vertical axis from above,
In addition to making molding with high dimensional accuracy, plating should be easy to finish neatly. A caster body (1) in which a vent hole (8) communicating with the outside is formed in an inner bottom of a bottomed mounting hole (7) which is inserted by inserting a vertical axis (6) from above.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a caster made of a synthetic resin, and more particularly, to a caster body capable of forming a caster body to which a vertical axis is attached to a desired size.

[0002]

[Prior art]

 The caster has rotatable wheels, and is rotatably mounted on a mounting portion such as a leg of furniture so that a vertical axis fixed to the mounting portion can be rotatably mounted.

One of the structures is a bottomed mounting hole 101 into which a lower part of a vertical axis is inserted (see FIG. 4). The mounting 101 has an annular projection 102 below the middle part of the depth to keep the vertical axis from coming off, and the inner bottom surface 103 has a hemispherical shape to reduce frictional resistance with the vertical axis. Projection 104.

However, since the caster body 105 having the mounting holes 101 is formed of a synthetic resin, the mounting holes 101 are completed only after the mold 106 is pulled out. However, since the mounting hole 101 has a bottom and no through-hole, the inside of the formed mounting hole 101 is evacuated when the mold 106 is pulled out. Therefore, the diameter of the mounting hole 101 is slightly reduced as shown by the imaginary line in FIG.

[0005] Therefore, the dimensional accuracy cannot be obtained as desired, and the vertical axis cannot be inserted, or even if it is inserted, it does not turn smoothly.

[0006] Furthermore, even when the vertical axis is inserted at the time of assembly, there is no place for the air pushed on the vertical axis to escape.

[0007] Further, even if such a caster body is plated to make it look beautiful, the plating solution accumulates inside the mounting holes during the plating process, so it is necessary to pay attention to the plating solution. In some cases, the accumulated liquid dripped onto other finished parts and soiled it.

[0008]

[Problems to be solved by the invention]

 Therefore, the main object of the present invention is to make it possible to perform molding with high dimensional accuracy and to make it easy to perform plating and finish finely.

[0009]

[Means for Solving the Problems]

 The means for this is a caster body made of a synthetic resin having a bottomed mounting hole to which the vertical axis for holding the caster body in a rotatable manner is inserted by being inserted from above. The caster body is provided with a vent hole communicating with the caster.

[0010] In the caster body having such a configuration, a vent hole for communicating air with the outside and forming an air passage is formed in the inner bottom of the bottomed mounting hole, so that when the mold for molding is pulled out. In the case, air enters the mounting hole. As a result, the inside of the mounting hole will not be in a vacuum state, the mold can be easily removed, and since it will not be forcibly pulled out while the vacuum is maintained, the diameter of the mounting hole will not be reduced unexpectedly. You.

In addition, when plating is performed on the outer peripheral surface of the caster main body to finish it neatly, it is not necessary to pay attention so that the plating solution does not accumulate in the mounting holes. The accumulated plating solution is sequentially discharged from the ventilation holes.

It is preferable that the ventilation hole is formed in an inner bottom surface of the mounting hole. By doing so, it is possible to prevent a vacuum state from the initial stage of pulling out the mold, so that a certain effect can be obtained.

[0013] Preferably, the vent hole is formed to be straight and vertically downward from the inner bottom surface of the mounting hole. In other words, a vacuum can be prevented from the initial stage of pulling out the mold, and a certain effect can be obtained.At the time of plating, the plating solution that has entered the mounting hole easily flows down naturally, and the plating solution can flow quickly. Can be exhausted.

Another means is a caster formed using the caster body. In this caster, since the diameter of the mounting hole of the caster body is finished to a desired size as described above, a smooth turning operation can be obtained.

[0015]

[Embodiment of the invention]

 One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a side view of the caster main body 1. The caster main body 1 has a cover portion 4 that covers the upper side of a pair of wheels 3 attached to the left and right sides on the upper outer peripheral edge of a partition plate 2 that is substantially semicircular in a side view. A through-hole 5 is formed through which an axle (not shown) for mounting the wheel 3 passes in the lateral direction, and a caster body 1 is pivotally mounted on one side of the partition plate 2 at an upper portion on one side thereof (not shown). The mounting hole 7 for holding the longitudinal axis 6 is formed, and is made of synthetic resin.

The mounting hole 7 is formed as a bottomed hole from the top to the bottom of the cover portion 4, and a vent hole 8 communicating with the outside is formed in the inner bottom portion.

FIGS. 2 and 3 are cross-sectional views of the caster main body 1 taken along the line AA in FIG. 1. As shown in these figures, the mounting hole 7 of the caster main body 1 has a round hole shape. An annular protrusion 10 is formed at the lower part of the vertical axis 6 so that the retaining groove 9 formed therein is fitted therein, and a hemispherical projection 11 is formed on the inner bottom surface 7a. ing. The ventilation hole 8 is formed vertically beside the protrusion 11 vertically downward.

In order to shorten the length of the ventilation hole 8, an undercut portion 12 is formed from one side surface at a lower portion of the mounting hole 7. It is better not to penetrate the slush portion 12 from one side surface to the other side because the strength of the inner bottom surface 7a of the mounting hole 7 can be maintained.

In the caster body 1 configured as described above, after injecting the synthetic resin into the mold, the left and right molds are removed, and then the mold 13 in which the mounting holes 7 are formed is removed. When the left and right molds are removed, the slack portion 12 can be formed. When the mold 13 in which the mounting hole 7 is formed is removed, a ventilation hole 8 is formed as shown in FIG. 2, and air enters the mounting hole 7 through the ventilation hole 8.

Therefore, the inside of the mounting hole 7 does not become a vacuum state, the die can be smoothly removed, and the diameter of the mounting hole 7 can be prevented from being reduced.

Therefore, since the mounting hole 7 having the desired dimensions can be obtained, the work can be performed smoothly without being too tight when the longitudinal axis 6 is inserted, and the turning state is also good as desired. Casters can be obtained.

Further, since the ventilation hole 8 is formed in the inner bottom surface 7 a of the mounting hole 7, when the vertical axis 6 is inserted, as shown in FIG. Is discharged to the outside through the ventilation hole 8. For this reason, a smoother assembling work can be expected in combination with the high dimensional accuracy described above.

Further, when such a caster main body 1 is to be plated to obtain a beautiful appearance, a plating process may be performed as usual. Even if the plating solution is collected and stored in the mounting hole 7 without any care, the plating solution entering the mounting hole 7 naturally flows down from the ventilation hole 8, so that the pooling can be prevented. For this reason, it is possible to prevent the accumulated plating solution from spilling and contaminating other parts that have been neatly finished.

Further, since the ventilation holes 8 are formed to be short, there is no inconvenience that the plating solution is clogged and the function is hindered, and the above-mentioned effects can be surely obtained.

The above is one embodiment of the present invention, and the present invention is not limited to the above configuration. For example, the vent 8 may be formed at a position above the inner bottom surface 7a, and the shape of the vent 8 may be oblique or the like.

The caster main body 1 has various shapes depending on the configuration of the caster. For example, in the above example, the case where the through hole 5 for attaching the axle is provided has been described, but a caster body having no through hole 5 may be used.

[0027]

[Effect of the invention]

 As described above, according to the present invention, since the diameter of the mounting hole is not reduced by forming the ventilation hole at the inner bottom of the mounting hole, the operation of inserting the vertical axis can be performed smoothly as desired. In addition, when the vertical axis is inserted into the mounting hole, the caster does not become tight and difficult to turn, and a caster having desired performance can be obtained.

In addition, when plating is performed, the plating solution that has entered the mounting holes is discharged from the ventilation holes, so that there is no need to pay attention to the plating solution not entering the mounting holes during plating, and the plating can be performed easily. In addition, it is possible to prevent the other parts from being accidentally stained by the accumulated plating solution, and a beautiful finished state can be easily obtained.

Further, since the above-described effects can be obtained, there is an advantage that occurrence of defective products can be suppressed in manufacturing.

The caster formed by using such a caster body has a high dimensional accuracy of the mounting hole, so that a smooth turning operation can be obtained. For this reason, the caster has a high performance as desired.

[Brief description of the drawings]

FIG. 1 is a side view of a caster main body.

FIG. 2 is a sectional view showing an operation state.

FIG. 3 is a sectional view showing an operation state.

FIG. 4 is a partial cross-sectional side view of a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Caster body 6 ... Vertical axis 7 ... Mounting hole 7a ... Inner bottom surface 8 ... Vent

Claims (5)

[Utility model registration claims] 1. A caster body made of synthetic resin having a bottomed mounting hole for mounting by inserting a vertical axis from above to hold the caster body in a freely rotatable manner. A caster body with communicating vents. 2. The caster body according to claim 1, wherein the ventilation hole is formed on an inner bottom surface of the mounting hole. 3. The caster body according to claim 1, wherein the ventilation hole is formed vertically downward from an inner bottom surface of the mounting hole. 4. The caster body according to claim 1, wherein the outer peripheral surface is plated. 5. A caster formed using the caster body according to any one of claims 1 to 4.