CN87217227U - Ball castor - Google Patents

Abstract

The utility model relates to a ball castor. The ball castor is composed of a sphere, a casing matched with the sphere and a plurality of rolling balls. The inner surface of the casing is at least provided with three annular roller paths, the bottom of every roller path is provided with a convex section, and the rolling balls are densely arranged in the roller paths. When the sphere rotates, the rolling balls can roll in the roller paths and can pass through the convex section in turn, namely the sphere only contacts with a plurality of rolling balls, and thus the sphere can rotate flexibly.

Description

Ball castor

The utility model relates to a kind of castor, particularly a kind of ball castor.

Existing castor has axle mostly, promptly has two orthogonal bolsters.The weight capacity of this class castor is limited, rotates also not too flexible.Chinese patent CN87202299 discloses a kind of Foot weel without shaft, and it is made up of a hollow steel ball, a housing, a nylon cages and several steel balls, and wherein nylon cages is provided with the hole, cave that some circles are placed steel ball.Each steel ball in this according to reason Foot weel without shaft all should contact with hollow steel ball, and should be able to rotate flexibly in the hole, cave of retainer.Therefore higher to each other accuracy requirement of part, this can improve manufacturing cost undoubtedly.Said sheet stamping technology is inaccessible requirement in this patent specification and adopt, and is actually the effect that is difficult to realize universal rotation.Particularly under the situation of load-bearing, hollow steel ball is easy to stuck.

Task of the present utility model is that a kind of ball castor flexible, that manufacturing cost is lower that rotates is provided at the above-mentioned weak point of prior art.

Solution of the present utility model is: the ball castor that is provided is had by a spheroid, one with the housing of the inside face that this spheroid matches and some balls between spheroid and shell inner surface to be formed.Have three ring raceways on the inside face of housing at least, the central symmetry axes of each ring raceway and the vertical axis of shell inner surface intersect, and the ball solid matter is among ring raceway.The location that one projection is arranged in the bottom of each ring raceway, this projection location equals ball diameter to the distance between spheroid.Each ball rolls in ring raceway when castor moves, and successively by protruding location; And the power of being born on the castor housing is to be delivered on the spheroid by the ball on the above-mentioned protruding location.

Shell in the utility model can be made with steel, also can be made of plastic or shell and spheroid all made of plastic.

The utility model has been owing to adopted ring raceway, and has only several balls to contact with spheroid, and is so rotation is more flexible, also not high to manufacture process requirement.Other part of this castor is less in addition, except that ball, and all available plastics manufacturing of spheroid and housing, thereby cost is lower.

Below in conjunction with accompanying drawing to content of the present utility model in addition detail describe.

Fig. 1 is the front elevation of an embodiment of the present utility model.

Fig. 2 is the upward view of Fig. 1 middle shell.

Fig. 3 is the part sectional view at A-A place among Fig. 2.

Fig. 4 is the part sectional view at B-B place among Fig. 2.

Fig. 5 is the front elevation of another embodiment of the utility model.

As shown in Figure 1 and Figure 2, the ball castor mainly is made up of housing 1, spheroid 2 and ball 3.The inside face of housing 1 is spherical, has circumferential uniform chains round raceway 4, the ball 3 in three edges to be closely packed in the raceway 4 on it.The bottom of raceway 4 is semicircle, and location 5, the remainder that a projection is arranged in the middle of it is etc. dark (seeing Fig. 3, Fig. 4).The distance that this projection location 5 and spheroid are 2 equals the diameter of ball 3, and promptly spheroid 2 in fact only contacts with ball on the protruding location 5.Ball 3 rolls along raceway 4 when spheroid 2 rotates, and successively by protruding location 5.Stable more for the rotation that makes spheroid 2, flexibly, the ball quantity that can place simultaneously on the protruding location 5 should reduce as far as possible, is preferably two, the length in promptly protruding location 5 less than the two-fold ball diameter greater than one times ball diameter.For the big caster wheel of supporting power, can set up a ring raceway 6 again at the top of housing spherical inside surface, its protruding location 7 is at the center at top.Above-mentioned housing 1 and spheroid 2 all adopt plastics to make (as with phenolic plastic or other rigid plastic).Locate with spacing ring 8 between spheroid 2 and the housing 1.The inside face of spacing ring 8 also is spherical, is connected by engage thread with 1 of housing, therefore, adorns, tears open more convenient.

Fig. 5 has provided second embodiment of the present utility model.Be provided with the ring raceway 10 of three annular arrangements on the inside face of housing 9, be provided with rib 11 at the outside face of shell 9 and the corresponding position of ring raceway 10, the structure of remainder is identical with first embodiment.This castor mainly is applicable to the occasion that carrying is lighter.

Claims (3)

1, a kind of ball castor, have with the housing 1,9 of the inside face that this spheroid matches and some balls 3 between spheroid 2 and housing 1,9 inside faces by a spheroid 2, one and to form, it is characterized in that on the inside face of housing 1,9, having three ring raceways 4,10 at least, the vertical axis of the central symmetry axes of each ring raceway and housing 1,9 intersects, the ball solid matter is among ring raceway 4,10, in the bottom of each ring raceway one protruding location 5 is arranged, this projection location 5 equals the diameter of ball 3 to the distance of 2 of spheroids.

2, the ball castor as claimed in claim 1, the length that it is characterized in that said protruding location 5 is less than the two-fold ball diameter, greater than one times ball diameter.

3, the ball castor as claimed in claim 1 or 2 is characterized in that housing 1,9 and spheroid 2 are all made of plastic.