JP2505870Y2 - Caster mounting structure - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a caster mounting structure, and more particularly to a light cast resin caster mounting structure for a lower end of a metal pipe leg.

[0002]

2. Description of the Related Art Conventionally, as shown in Japanese Utility Model Laid-Open No. 2-108602, a resin caster of this type has a resin main body that rotatably supports wheels and is rotatable about an axis perpendicular to the main body. A screw integrally formed with the mounting base to the inner socket that is composed of the mounted resin mounting base and is mounted via a nut that is fitted into the lower end opening of the metal pipe leg so that it cannot be moved upward or rotated. It has a mounting structure that is detachably screwed through a shaft.

[0003]

[Problems to be Solved by the Invention] However, in the conventional caster mounting structure,
Although it is advantageous in terms of rust prevention and weight reduction, in the case of a universal caster, the load concentrates on the screw shaft that is the connecting portion between the mounting base and the inner socket, which is disadvantageous in terms of strength, and is a metal caster of the same size. Although it is inferior in terms of load bearing performance, etc., in order to obtain strength equivalent to that of a metal caster, there is a problem in that the size other than the wheels must be increased. In addition, the inner socket is screwed into the lower end opening of the pipe leg via a nut so as to adjust the length of the pipe leg, so that moisture can be removed from the fitting insertion portion between the pipe leg and the inner socket to the nut. Penetrating inside the pipe leg through the screwing part and the fitting part of the pipe and the nut,
The rusting or the like causes the service life of the pipe leg to be shortened, so that the use conditions are limited, such as use in a place where rainwater is not splashed. Therefore, the present invention can improve load bearing performance in a compact size without impairing the advantages of resin-made rust prevention and weight reduction, and also improves the durability of metal pipe legs regardless of usage conditions. It is an object of the present invention to provide a mounting structure for a caster that can be used.

[0004]

In order to solve the above-mentioned problems, the caster mounting structure of the present invention is a resin free caster mounting structure for the lower end of a metal pipe leg, in which the lower end opening of the metal pipe leg is opened. A resin cap, which is integrally formed with a bottomed cylindrical portion having an outer opening at the center of the bottom, is airtightly fitted to the outer periphery of the bottom portion. Is detachably screwed through a vertically upward metal screw shaft that is inserted into the mounting base.

[0005]

In the above means, the pipe leg is attached by the metal screw shaft, and the bottomed cylindrical portion blocks the intrusion of water into the pipe leg.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a vertical sectional view showing an embodiment of a caster mounting structure of the present invention. In the figure, 1 is a metal pipe leg, which is about 1 m on the outer peripheral surface of a thin steel pipe having a thickness of about 0.7 mm.
Outer diameter 28 to which AAS resin or the like is adhesively coated with a thickness of about m
It consists of a resin-coated steel pipe of about 32 mm. A resin cap 2 injection-molded with ABS resin or the like capable of adhering to the coating resin is airtightly fitted to the outer periphery of the lower end opening of the metal pipe leg 1 via an adhesive. Resin cap 2
At the center of the bottom of the, a bottomed cylindrical portion 3 that opens outward (downward in FIG. 1) is integrally formed with a length equal to that of the cylindrical portion 4 of the resin cap 2. A threaded portion 5 is formed on the inner peripheral surface of the bottom tubular portion 3, while a plurality of axial ribs 6 capable of contacting the inner peripheral surface of the metal pipe leg 1 are provided on the outer peripheral surface thereof. It has the same length as the bottom tube portion 3 and is integrally formed.

The resin free caster 7 is formed by injection molding an engineering plastic such as nylon resin containing glass fiber, and a resin main body 9 rotatably supporting a wheel 8 having a diameter of 65 to 75 mm, and the resin main body. A resin mounting base 10 formed by injection-molding the same engineering plastic as that of 9, which is appropriately biased from the supporting position of the wheel 8 and is rotatably mounted on an axis perpendicular to the resin main body 9, and the resin mounting base 10. It is roughly configured by a vertically upward metal screw shaft 11 that is inserted and attached to a manufacturing mount 10. That is, the resin main body 9 includes a bifurcated support portion 12 for supporting the wheel 8 and a cylindrical shaft portion 13 projecting from the center of the upper surface of the support portion 12, and the shaft portion 13 has an upper surface. A metal race 14 having a crown shape covering the peripheral side surface and having a ball groove formed on its peripheral side portion is integrally attached by insert molding or the like.

On the other hand, the resin mounting base 10 includes a cylindrical mounting portion 15 having an outer diameter equivalent to that of the resin cap 2.
A cap-shaped bearing portion 16 is provided so as to project downward at the lower end of the mounting portion 15 and has an inner diameter that is appropriately larger than the outer diameter of the shaft portion 13 of the resin main body 9, and a plurality of screws 17 are provided at the lower end portion of the bearing portion 16.
And a steel ball retaining ring 19 that holds a large number of steel balls 18 between the shaft portion 13 of the resin main body 9 in cooperation with the bearing portion 16, and the shaft center portion of the mounting portion 15. Is a metal screw shaft 1 consisting of a hexagon headed bolt
1 is fixed by a head so as to be inserted vertically upward from the lower surface, and the entire inner surface of the bearing portion 16 and the inner peripheral surface of the steel ball retaining ring 19 have a crown shape and a ring shape, and the boundary between the two. Metal races 20 and 21 with ball grooves
But they are attached closely.

The resin main body 9 and the resin mount 10
Is rotatably assembled by inserting a large number of steel balls 18 into the ball grooves of the metal race 14 of the shaft portion 13, the bearing portion 16 and the metal races 20 and 21 of the steel ball retaining ring 19. Further, the resin free caster 7 has the metal screw shaft 11 screwed into the threaded portion 5 of the bottomed cylindrical portion 3 of the resin cap 2 and is engaged with the spanner hook portion 150 formed outside the mounting portion 15. The upper surface of the mounting portion 15 of the resin mounting base 10 is pressed against the bottom surface of the resin cap 2 through a spanner or the like to be detachably screwed to the resin cap 2, that is, the metal pipe leg 1. .

In addition, each metal race 14, 20, 21
Is formed by pressing a thin metal plate such as a steel plate having a thickness of 0.4 to 0.6 mm. In the above embodiment, the case where the metal pipe leg 1 is the resin-coated steel pipe has been described, but the present invention is not limited to this. For example, a thin steel pipe having an outer surface plated or painted is used. It may be a metal pipe leg. Further, the metal pipe leg is not limited to have a circular cross section, and may have a rectangular shape or another shape.

[0011]

As described above, according to the caster mounting structure of the present invention, since the mounting to the pipe leg is performed by the metal screw shaft, while taking advantage of the rust prevention and the weight saving by the resin, It can be made compact and the load bearing performance can be greatly improved. or,
Moisture entering the pipe leg through the screw shaft is blocked by the bottomed tube, which prevents rusting inside the metal pipe leg, which in turn determines the useful life of the metal pipe leg depending on operating conditions. It can be improved significantly without

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of a caster mounting structure of the present invention.

[Explanation of symbols]

 1 Metal Pipe Leg 2 Resin Cap 3 Bottomed Tube 5 Screw 7 Flexible Resin Caster 10 Resin Mounting Base 11 Metal Screw Shaft

Claims (1)

(57) [Scope of utility model registration request] 1. A structure for mounting a resin free caster on a lower end of a metal pipe leg, wherein a bottomed cylindrical portion having an outer opening is integrally formed on the outer periphery of a lower end opening of the metal pipe leg. A resin cap is airtightly fitted, and a resin free caster can be attached to and detached from the screw part formed on the inner peripheral surface of the bottomed cylindrical part via a vertically upward metal screw shaft that is attached to its mounting base. The caster mounting structure is characterized by being screwed to the.