Patent ID: 6419319
Filing Date: 2002-07-16
Classification: A47C,B60B

Abstract:
A wheel device comprising:a wheel having an axle; a holder member for holding said wheel; an urging member, arranged between said wheel and said holder member, for constantly urging said wheel to be projected in an operable position; a retraction permitting member adapted to permit said wheel to be automatically retracted when a load sufficient to overcome the urging force of said urging member is exerted in the direction of gravity on a member on which said wheel is mounted; said retraction permitting member including a setting mechanism for setting said wheel to be in a retraction blocked state; and wherein the holder member includes a bearing that supports the axle of the wheel and a casing that supports the bearing; and wherein the setting mechanism is arranged within the casing and is operatively associated with the bearing so as to act on the bearing to set the wheel to be in the retraction blocked state.