JP3014949U - caster - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a caster that can be easily assembled in a vehicle, can be assembled with high accuracy without rattling, and can be smoothly turned. [Structure] This caster is supported by a hawk 6 so that the hawk 6 can turn through a turning shaft 2 which is perpendicular to a mounting plate 1.
A wheel 7 is pivotally supported on the lower part of the. A thrust bearing 5 made of synthetic resin is externally fitted to and attached to the swivel shaft 2 below the mounting plate 1, and an upper portion of the fork 6 is below the thrust bearing 5 and the swivel shaft 2 is located above.
It is attached so as to be fitted into the lower part of the fork.
The upper part of was attached to the mounting plate 1 via a thrust bearing 5.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a caster in which a fork supporting a wheel is pivotally supported around a vertical axis (swivel axis) with respect to an upper mounting portion.

[0002]

[Prior art]

 Conventionally, in this type of caster, as shown in FIG. 4, a swivel shaft 22 is vertically fixed to the center of a mounting plate 21, and a lower one 23 for ball bearings is fixed to the lower part of the swivel shaft 22. A large number of steel balls 24 are arranged in the one 23. Further, the upper one 25 is fixed to the upper part of the hawk 26 that supports the wheel 20, the many steel balls 27 are arranged in the upper surface of the upper one 25, and the steel balls 27 contact the lower surface of the mounting plate 21. .

Further, the upper part of the hawk 26 of this caster is extended above the lower one 23, the inside thereof contacts the steel ball 24 in the lower one 23, and the hawk 26 lowers its lower side. It is supported by a steel ball 24 in 23, and the upper side thereof is supported by a steel ball 27 in the upper one 25, and can be swiveled around the swivel shaft 22.

[0004]

[Problems to be solved by the device]

 However, in the conventional caster configured as described above, when assembling the caster, the steel ball 27 is put on the upper one 25 and the steel ball 24 is put on the lower one 23, and both members are put together. Since it is fitted into the swivel shaft 22 and is assembled by caulking the end of the swivel shaft 22 in that state, the assembling work is very difficult and a gap or rattling occurs around the steel balls 24 and 27. There was a problem that the assembly accuracy was reduced.

[0005]

[Means for Solving the Problems]

 The present invention has been made in view of the above points, and an object of the present invention is to provide a caster that can be easily assembled and that can assemble a hawk with high precision without rattling and can swivel smoothly. .

In order to solve the above-mentioned problems, the caster of the present invention is a caster in which a hawk is rotatably supported via a turning shaft perpendicular to a mounting plate, and wheels are rotatably supported below the hawk. A thrust bearing made of synthetic resin is mounted on the lower side of the mounting plate by fitting it over the swivel shaft, and an upper part of the hawk is mounted on the lower side of the thrust bearing so that it fits in the lower part of the swivel shaft. It is characterized in that the upper part of the hawk is attached to the attachment plate through the thrust bearing by screwing a nut or caulking the tip of the turning shaft.

[0007]

[Action / effect]

 With a caster having such a structure, when manufacturing and assembling, there is no need for the complicated work of crimping the swivel shaft while holding the ball bearings on the upper one and the lower one as in the conventional case. Resin thrust bearings can be easily assembled by simply inserting them into the swivel shaft.Because ball bearings and needle bearings are not present in the bearings, there is no rattling and highly accurate assembly is possible. .

This caster is used by being attached to the bottom of a trolley, etc., but the thrust coefficient of synthetic resin thrust bearings is smaller than that of ordinary slide bearings, and a sufficient load can be applied. Therefore, it is possible to easily turn even when the wheel receives a large load.

In addition, casters that use thrust bearings made of synthetic resin are lighter in weight than casters that use steel balls or ball bearings, and have less corrosion and wear, and should be used with stable performance for a long period of time. You can

[0010]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a front view of a caster with a partial cross section, and FIG. 2 shows a vertical cross section thereof. Reference numeral 1 denotes a mounting plate which is mounted on the bottom of a dolly or the like, and a swivel shaft 2 is fitted into the hole formed in the center of the mounting plate 1 from above via a washer 3. The upper part of the hawk 6 is fitted into the lower part of the swivel shaft 2 via a thrust bearing 5 made of synthetic resin. A male screw is formed in the lower part of the swivel shaft 2, and a nut 4 is screwed into this portion, and a fork 6 is tightened and fixed by the nut 4 via a thrust bearing 5.

As shown in FIG. 3, the thrust bearing 5 includes a donut cup-shaped upper case 5a and a lower case 5b made of synthetic resin, with a synthetic resin ring plate 5c interposed therebetween. It is rotatably assembled and filled with grease.

Inside the upper case 5a and the lower case 5b, mutually interfitting seal walls are formed in a circumferential shape, and the upper case 5a and the lower case 5b can rotate relative to each other in a state where the inside is sealed. Be assembled into.

Grooves are formed in the circumferential direction and the radial direction on the surface of the synthetic resin ring plate 5c inserted inside. The load between the upper case 5a and the lower case 5b is applied to the upper surface and the lower surface of the ring plate 5c. Even if a large load is applied in the vertical direction due to the grease interposed in the groove or surface of the ring plate 5c, The coefficient of friction between the lower cases 5b is small, and the cases can be easily rotated without deformation or friction.

A collar portion is provided so as to project from the upper portion of the upper case 5 a, and the thrust bearing 5 is assembled so that the collar portion is inserted between the mounting plate 1 and the rotary shaft 2. Further, a circular recess is formed in the upper part of the hawk 6, the thrust bearing 5 is inserted in the circular recess, and the nut 4 is screwed into the male screw portion of the swivel shaft 2 to attach the hawk 6 to the mounting plate 1. Assemble so that it can rotate.

A wheel 7 is rotatably supported on a lower portion of the hawk 6 via a horizontal rotary shaft 8 and a ball bearing 9, the wheel 7 rolls in the front-back direction of the hawk 6, and the hawk 6 is attached to the mounting plate 1. On the other hand, it turns around the axis 2.

When assembling the caster having such a configuration, the thrust bearing 5 is fitted to the lower part of the revolving shaft 2 which is fitted and inserted in the center of the mounting plate 1, and the fork 6 is fitted from below the thrust bearing 5 to fit the nut. 4 can be screwed into the lower part of the swivel shaft 2 and can be assembled by a simple work such as tightening with an appropriate force. In addition, as in the case of using a conventional steel ball, there is rattling in the bearing part. Since it does not occur, it can be assembled with high precision.

Further, although this caster is used by being attached to the bottom of a trolley or the like, the thrust bearing made of synthetic resin has almost no friction or wear even when subjected to a large load from above and below, and the hawk 6 (wheel 7). Can be turned smoothly. Also, because the thrust bearing made of synthetic resin is used, the casters can be made lighter than when using the conventional upper and lower ones and steel balls, and when used in an environment where metals are easily corroded. However, it can be used satisfactorily for a long time.

In the above embodiment, the nut 4 is used for assembly, but it is also possible to caulk the lower end of the turning shaft for assembly without using the nut.

[Brief description of drawings]

FIG. 1 is a front view with a partial cross section of a caster showing an embodiment of the present invention.

2 is a side view with a partial cross section of the caster of FIG. 1. FIG.

FIG. 3 is a perspective view of a thrust bearing.

FIG. 4 is a side view with a partial cross section of a conventional caster.

[Explanation of symbols]

 1-mounting plate, 2-swivel shaft, 5-thrust bearing, 5a-upper case, 5b-lower case, 5c-ring plate, 6-hawk, 7-wheel.

Claims (2)

[Scope of utility model registration request] 1. A caster in which a hawk is rotatably supported via a swing shaft perpendicular to a mounting plate, and a wheel is pivotally supported at a lower portion of the hawk, and a caster made of a synthetic resin is provided below the mounting plate. A thrust bearing is externally fitted to and attached to the swivel shaft, an upper part of the hawk is attached to a lower side of the thrust bearing so as to fit into a lower part of the swivel shaft, and a nut is screwed to a lower end of the swivel shaft. Alternatively, the caster is characterized in that the upper end of the hawk is attached to the attachment plate via the thrust bearing by caulking the tip of the pivot shaft. 2. The thrust bearing has an upper case and a lower case made of synthetic resin, and the upper case and the lower case are rotatable relative to each other with a synthetic resin ring plate and grease inserted therein. The caster according to claim 1, which is fitted to the caster.