Patent ID: 7588452

Claim:
A fastening device for retaining a chip module to a printed circuit board, comprising: an insulative housing having a plurality of terminals received therein; a stiffener adapted for assembling on the printed circuit board, the stiffener defines a base having an opening for receiving an insulative housing; a fixing ring located on a bottom of the stiffener for fastening a knob on the stiffener; a pair of parallel lateral sides extending upwardly from the base; the base comprising first and second main portions; the first main portion for fastening the knob and the second main portion for joining with a load plate; the load plate pivotally assembled to a first end of the stiffener, the load plate having a pressing side with a tongue; and a retaining side for attaching to the stiffener; and the load plate defines a pair of hooks corresponding to fastening portions for jointing the load plate with the stiffener; the base has a projecting portion, the projecting portion being offset from the base; the knob having a stem rotationally assembled to a second end of the stiffener, and provided with a guiding slot helically defined along the stem such that the tongue of the load plate engaged with the guiding slot can be moved up and down when the knob is rotated clockwise and counterclockwise; a stopper is formed between the two hooks for abutting against the stiffener to prevent the load plate from over rotation.