Patent ID: 8221248

Claim:
An overload protection mechanism, comprising: a frame comprising at least one side plate, the at least one side plate defining a receiving depression in an inner surface thereof; a positioning assembly received in the frame, the positioning assembly comprising a fixing sleeve, at least one elastic member compressed and received in the fixing sleeve, and at least one latching member positioned on the at least one elastic member, the at least one elastic member resisting the at least one latching member so as to be movably received in the receiving depression and the fixing sleeve, thereby the positioning assembly is received in the frame, wherein the at least one side plate further defines a slanted repositioning surface adjoining the receiving depression; when an external drawing force is applied to the positioning assembly, the at least one latching member presses the at least one elastic member to leave the receiving depression and slide along the slanted repositioning surface, and thereby the external drawing force is absorbed; when the external drawing force is removed, the positioning assembly is slidable relative to the frame with the at least one compressed elastic member resisting the at least one latching member to press the at least one latching member back into the receiving depression along the slanted repositioning surface; the fixing sleeve further comprises at least one pair of slide rails extending out from the outer side of one end of the fixing sleeve adjacent to an opening of the fixing sleeve; the at least one side plate defines a pair of elongated slide grooves in opposite side surfaces of the groove corresponding to the pair of the slide rails; and the slide rails are slidably attached to the corresponding slide grooves of the at least one side plate.