Patent ID: 7468889

Claim:
A thermal module fastener installed in a blade server to secure a thermal module and a motherboard to a metal face panel to keep said thermal module in close contact with an electronic device on said motherboard for dissipating heat from said electronic device and also to keep said thermal module and said metal face panel in different grounding loops, the thermal module fastener comprising: a cushion member made of an electrically insulative material and set between said motherboard and said metal face panel, said cushion member having a bottom positioning portion fastened to a mounting through hole in said metal face panel, a top bearing portion supported between said metal face panel and said motherboard, and a center screw hole extending through said bottom positioning portion and said top bearing portion; a spacer member made of an electrically insulative and elastically compressible material, said spacer member having a spacer block set between said thermal module and said motherboard, a positioning portion axially downwardly extending from said spacer block and positioned in a through hole of said motherboard, and a screw hole extending through top and bottom sides thereof in vertical alignment with the center screw hole of said cushion member; a lock member for locking said motherboard and said cushion member to said metal face panel, said lock member having a head stopped at a bottom side of said metal face panel and a threaded shank perpendicularly extending from said head and threaded into the center screw hole of said cushion member and a bottom end of the screw hole of said spacer member; a locating member for securing said thermal module to said motherboard, said locating member having a cylindrical body mounted in said thermal module, a socket head disposed at one end of said cylindrical body and spaced above said thermal module, and a connection tip axially downwardly extending from one end of said cylindrical body opposite to said socket head and threaded into a top end of the screw hole of said spacer member; a digital grounding loop formed in said locating member and said thermal module by means of the connection between said spacer member and said locating member; and an analog grounding loop formed in said lock member and said metal face panel by means of the connection between said spacer member and said locating member and separated from said digital grounding loop.