Patent ID: 7520021

Claim:
A wheel assembly comprising: a support unit including a sleeve, a stop hole and a recess being defined in the sleeve and neighboring to each other, brackets respectively extending from opposing sides of the sleeve, a rotating shaft pivoting a wheel between the brackets; a rotating unit including a base, an axis portion extending from a surface of the base for movably engaging with the sleeve, a toothed surface being formed on a side of the axis portion for corresponding to the stop hole; and an arresting unit including a limiting portion movably pivoted between the brackets and in the vicinity of the wheel, a pressing plate pivoting to an end of the limiting portion movably, a link portion movably linking the limiting portion and the pressing plate and including an abutting portion, a resilient member being provided between the link portion and the limiting portion and fastening to a shaft block on the link portion, the limiting portion forming a stop portion thereon for corresponding to the stop hole of the sleeve, wherein a resilient portion is provided between the limiting portion and the sleeve and is received in the recess.