Patent ID: 6810560
Filing Date: 2004-11-02
Classification: B60B,Y10T

Abstract:
A castor comprising:a castor supporting member having a cylindrical hole formed in an upper rear portion, a shaft hole formed in an upper front portion, a pivot base portion formed under said shaft hole and having two vertical parallel walls defining an interior hollow, said pivot base portion having an insert recess respectively formed in an inner surface of said two vertical parallel walls, said cylindrical hole having a plurality of vertical projecting-inward ridges formed spaced apart equidistantly on an inner wall and a plurality of vertical grooves also spaced apart equidistantly in the inner wall and alternately interposed with said vertical projecting-inward ridges; a brake system positioned in a lower portion of the hollow interior of said castor supporting member, said brake system consisting of a brake plate, an upper brake button and a lower brake button, said brake plate having a disc gear formed in a front portion, a sidewise projections formed at two sides of an intermediate portion, a projection with a center hole formed in a rear end, a steel ball fitted in the center hole, said lower brake button having a plurality of vertical ridges spaced apart on an outer circumferential surface and a plurality of sloped surfaces formed on an annular surface of a lower portion of said lower brake button, said upper brake button fitting on an upper half portion of said lower brake button and having plural sloped surfaces to match with those of said lower brake button; an orienting system provided in a lower portion of the hollow interior of said castor supporting member, consisting of a position plate, a pedal and a release plate, said position plate having a hooking member in a front end, a pivotal hole in an intermediate portion and a pivotal hole in a rear end, said pedal and said release plate positioned by pivots fitting in said pivotal holes; a direction gear positioned a little above said gear of said brake plate, having a center hole for a threaded rod to pass through from under and fixed with the threaded rod; a castor unit combined with said castor supporting member, having a castor body, a sealing member, a protective cap and an axle extending through the center hole of said sealing member, said protective cap and said castor body combined with the two pivotal holes of said pivot base portion of said castor supporting member; a threaded rod unit having a threaded rod, an oil seal, a connect head and a female-threaded tube positioned orderly on said shaft hole of said castor supporting member, said threaded rod passing through the center hole of said gear of said brake plate, the center hole of said direction gear, said shaft hole of said castor supporting member, said oil seal, said connect head and then screwing with female threads of said threaded tube; and, said upper brake button pressed down for a certain distance for putting the brake on said castor body and pressed down further for a little distance to take the brake off said castor body, said pedal pressed down to secure the rolling direction of said castor, and said release plate pressed down to remove the locked direction of said castor.