Patent ID: 8434750
Filing Date: 2013-05-07
Classification: B25B

Abstract:
1. A positioning device comprising: a base; a platform; a support fixed on the base; a rotatable member fixed to the platform and rotatably connected to the support; and a positioning member fixed to the platform, wherein the positioning member is operable to cooperate with the support to lock the platform in a desired position; wherein the support comprises a lateral surface defining a hole opposing the positioning member, and a receiving chamber extending from one end to an opposite end, a diameter of the opposite end of the receiving chamber exceeds that of a middle portion of the receiving chamber, the rotatable member comprises a body and two bearings arranged around opposite ends of the body, the body is rotatably received in the middle portion of the receiving chamber, the two bearings are fitted in the opposite ends of the receiving chamber, thereby rotatably connecting the rotatable member to the support; and the rotatable member further comprises an extending portion extending from one end of the body, a threaded hole is defined in the extending portion, the platform comprises a main body and a central bolt, the main body defines a central threaded hole, the central bolt passes through the central threaded hole and the threaded hole of the rotatable member to fix the rotatable member to the platform.