Patent ID: 8000094

Claim:
A rotation module comprising: a base comprising a resisting surface, a connecting surface opposite to the resisting surface, and a cylindrical protrusion extending from the resisting surface, wherein a locking portion is formed at an end of the cylindrical protrusion, and the cylindrical protrusion defines an opening through the locking portion; and a rotation member comprising a bottom surface and a supporting surface opposite to the bottom surface, the rotation member defining a substantially circular through hole communicating the bottom surface with the supporting surface; wherein the cylindrical protrusion is received in the circular through hole so that the rotation member is rotatable relative to the base; the locking portion being deformable due to the opening, such that the cylindrical protrusion is able to pass through the circular through hole, after which the locking portion releases and resists the rotation member to prevent the rotation member from detaching from the base; wherein the rotation module further comprises a protecting sleeve positioned in the circular through hole of the rotation member; a flange is formed at an end of the protecting sleeve, the flange resists the supporting surface of the rotation member, and the locking portion resists the flange; and wherein the resisting surface forms an annular protrusion; the cylindrical protrusion is taller than the annular protrusion; the annular protrusion resists the bottom surface of the rotation member to provide complete circular rotation of the rotation member.