Patent ID: 7356877

Claim:
A caster used with an object comprising: a fixing portion installed on a bottom surface of an object; a wheel portion which is installed to be elevated into the fixing portion and has a moving wheel provided on a bottom surface of the wheel portion; an elevating portion having a rotating member disposed on a portion of the elevating portion to be rotatable with respect to the elevating portion and a guide plate contacting a rolling member of the elevating portion to control the wheel portion to be elevated into the fixing portion between a first fixed position and a second fixed position such that the wheel does not enter the fixing portion and the guide plate guides the rotating member when a force is applied to the elevating portion to push the object and the wheel portion together with respect to a reference position; and, an elastic member installed on an upper surface of a body of therotating member to elastically bias the rotating member in a downward direction of the fixing portion, wherein the wheel portion descends from the fixing portion into the first fixed position to move the object and elevates with respect to the fixing portion into the second fixed position to fixedly dispose the object in a position.