| 摘要 |
PURPOSE: An expansion caster is provided, which can resist in the side thrust which is applied to the side of the caster and can change directions in the inclined direction of an object. CONSTITUTION: An expansion caster includes an upper plate(10), a bottom plate(20), and a guide(30). The upper plate includes a groove of cam shape and an attachment unit. The bottom plate includes the groove of cam shape and the bracket in which a wheel is mounted. The groove of the upper plate and groove of the bottom door face with each other and make vertical expansion possible by cam movement. The guide guides the bottom plate to slide up and down from the upper plate.
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