JPH04237603A - Bearing structure for caster - Google Patents

Abstract

PURPOSE:To prevent foreign material such as sea water from entering the inside of the bearing device of a caster. CONSTITUTION:A waterproof cover 6 is fitted to the periphery of a pivot 5 provided hangingly at the mounting bracket 4 of a caster 3. A bearing device 9 is provided in such a way as to come in contact with the lower face of the waterproof cover 6 and also to make a wheel supporting bracket 7 turnable around the longitudinal axis 8 of the pivot 5. The waterproof cover 6 is provided at its outer peripheral end with a bent part 6A formed downward along the whole periphery so as to cover a gap 17 between the upper pan 12 of the bearing device 9 and the lower face of the waterproof cover 6. Foreign material is thereby prevented from entering the inside of the bearing device 9 from the gap 17.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to casters used for carts and the like.

0002

2. Description of the Related Art Conventionally, there is a bearing structure for a caster of this type as disclosed in, for example, Japanese Patent Laid-Open No. 1-301401. That is, a mounting bracket is attached to the lower surface of the truck body, a cylindrical body is vertically mounted on the mounting bracket, a plurality of balls abutting the mounting bracket from below, and a pushing member that receives these balls from below. A bearing device is provided.

[0003] A wheel support bracket is externally fitted onto the cylindrical body via this bearing device, and is rotatable around a vertical axis.

0004

[Problems to be Solved by the Invention] According to the above-mentioned conventional type, since the pushing member rotates together with the wheel support bracket, a gap is provided between the pushing member and the mounting bracket. There was a risk that the metal could enter the inside of the bearing device through this gap.

[0005] Particularly in carts used for transporting fish and shellfish at fish markets, etc., seawater enters through the gaps, corroding the inside of the bearing device, and causing the wheel support brackets to become unable to rotate. .

An object of the present invention is to provide a caster bearing structure that can prevent foreign matter such as seawater from entering the bearing device.

[0007]

[Means for Solving the Problems] In order to achieve the above object, a caster bearing structure according to the present invention is a caster bearing structure in which a wheel support bracket is rotatably attached to a bracket for attaching to another object. A support shaft is installed vertically on the mounting bracket, a circular waterproof cover is tightly fitted onto the support shaft, and a plurality of balls are brought into contact with the waterproof cover from below, and these balls are connected from below. A bearing device comprising a receiving tray is provided, the upper end of the wheel support bracket is fitted into the receiving tray, and a bent portion having a larger diameter than the outer diameter of the receiving tray is suspended from the outer peripheral edge of the waterproof cover. It covers the outer surface of the saucer.

[0008]

According to the structure of the present invention, the wheel support bracket can freely pivot together with the receiving plate of the bearing device via the bearing device.

[0009] Since the gap between the saucer and the bottom surface of the waterproof cover is covered by the bent part of the waterproof cover,
Foreign matter such as seawater can be prevented from entering the bearing device from the outside through the gap.

0010

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. As shown in Figures 1 and 2, 1 is a trolley for transporting fish and shellfish, and the lower surface of the bottom plate 2 has four
Casters 3 are installed at the locations.

The caster 3 has a mounting bracket 4 that can be attached to the lower surface of the bottom plate 2 via bolts (not shown), and a support shaft 5 is vertically provided at the center of the mounting bracket 4. . An annular waterproof cover 6 is fitted onto the support shaft 5 so as to be in close contact with the outer peripheral surface of the support shaft 5 and the lower surface of the mounting bracket 4.

Below the waterproof cover 6, a wheel support bracket 7 is attached via the support shaft 5 to the vertical axis 8 of the support shaft 5.
A bearing device 9 is provided around which the bearing device 9 is rotatably supported. That is, this bearing device 9 is composed of a plurality of upper and lower balls 10 and 11 and upper and lower receiving plates 12 and 13.

The plurality of upper balls 10 are arranged circumferentially around the support shaft 5, and abut against the waterproof cover 6 from below. The upper tray 12 has an annular shape, and is fitted onto the support shaft 5 with ample space.A bent portion 12A is formed upward from the outer peripheral end of the upper tray 12, and the upper ball 10 is inserted into the upper tray 12 from below. It is received by the upper surface of and the inner circumferential surface of the bent portion 12A.

A cylindrical portion 7A formed at the upper end of the wheel support bracket 7 is fitted into the receiving tray 12, and an annular portion 7B extending horizontally outward from the cylindrical portion 7A is attached to the upper portion. It comes into contact with the lower surface of the saucer 12. Thereby, the upper tray 12 and the wheel support bracket 7 move together.

The plurality of lower balls 11 are arranged in a circumferential manner around the support shaft 5, and are connected to the wheel support bracket 7.
It comes into contact with the annular portion 7B from below. The lower tray 13 mentioned above
has an annular shape, is fitted onto the support shaft 5, has a recess 13A formed at its outer peripheral end, and receives the lower ball 11 from below in the recess 13A.

An annular fixing plate 14 is provided at the lower end of the support shaft 5.
is fitted onto the outside, and a support shaft 5 protrudes below this fixed plate 14.
A disk portion 5A having a larger diameter than the support shaft 5 is formed at the lower end of the support shaft 5, and the waterproof cover 6, lower tray 13, and fixing plate 14 are supported and fixed to the support shaft 5 by this disk portion 5A.

A bent portion 6A having a larger diameter than the outer diameter of the upper tray 12 is suspended from the outer peripheral end of the waterproof cover 6, and this bent portion 6A covers the entire outer surface of the upper tray 12. ing. A grease hole 6B for injecting grease is provided at a proper location of the bent portion 6A, and grease is injected into the inside of the bearing device 9 from this grease hole 6B to fill it.

The wheel support bracket 7 has a cylindrical portion 7A and an annular portion 7B formed at its upper end, and a pair of opposing side plates 7C and 7D which are connected downward from the annular portion 7B. It is composed of. This side plate 7C
, 7D, a lateral wheel axle 15 is provided between the lower ends of the wheels.
A wheel 16 is attached via this wheel shaft 15 so as to freely rotate.

The operation of the above embodiment will be explained below. The wheel support bracket 7 is rotatable around the vertical axis 8 of the support shaft 5 via a bearing device 9, so that the wheel 16 can move in any direction, and the truck 1 can be moved in any direction. I can do it.

The bent portion 6A of the waterproof cover 6 is connected to the upper tray 1.
2, the gap 1 between the bent portion 12A of the saucer 12 and the lower surface of the waterproof cover 6
7, foreign substances such as seawater are prevented from entering.

Since the upper ball 10 is supported by the upper tray 12 and the annular portion 7B of the wheel support bracket 7, by using the larger upper tray 12, the diameter of the pitch circle of the upper ball 10 can be increased. Can be set to . Therefore, the strength against the eccentric moment acting on the caster 3 can be increased without changing the dimensions of the upper end of the wheel support bracket 7.

In the above embodiment, the casters 3 are provided on the trolley 1, but they may also be provided on other items such as an office desk or a chair.

[0023]

According to the present invention having the above structure, by covering the outer surface of the tray constituting the caster bearing device with the bent portion of the waterproof cover, foreign matter such as seawater can be prevented from coming from the outside between the tray and the mounting bracket. It can prevent intrusion into the inside of the bearing device through the gap. Therefore, it is possible to prevent the inside of the bearing device from corroding and the caster becoming unable to turn.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway side view of a caster showing an embodiment of the present invention.

FIG. 2 is a perspective view of a cart to which the same casters are attached.

[Explanation of symbols]

1 Dolly (other items) 3 Casters 4 Mounting bracket 5 Support shaft 6 Waterproof cover 6A Bent part 6B Grease hole 7 Wheel support bracket 7A Cylindrical part 7B Annular part 7C Side plate 7D Side plate 9 Bearing device 10 Upper ball (ball) 11
Lower ball 12 Upper tray (saucer) 13
Lower tray 15 Wheel axle 16 Wheel 17 Gap

Claims (1)

[Claims] Claim 1: A caster bearing structure in which a wheel support bracket is rotatably attached to a bracket for attachment to another object, wherein a support shaft is vertically disposed on the attachment bracket, and the support shaft has an annular shape. A bearing device is provided, which includes a plurality of balls that contact the waterproof cover from below, and a tray that receives these balls from below, and the upper end of the wheel support bracket is attached to the tray. A caster bearing structure, characterized in that a bent portion having a larger diameter than the outer diameter of the saucer is hung from the outer peripheral end of the waterproof cover to cover the outer surface of the saucer.