Patent ID: 8320129

Claim:
A heat sink mounting frame for mounting a heat sink onto a circuit board, the heat sink mounting frame comprising: a circular guide rail; and a plurality of mounting arms movably connected with and extending radially and outwardly from the guide rail, each mounting arm comprising a fixing bracket movably connected to the guide rail and a sliding bar slidably connected with the fixing bracket, an engaging post formed on the sliding bar; wherein the sliding bar is received in and slidable along the fixing bracket, such that a total length of each of the mounting arms is variable to adjust the locations of the engaging posts of the mounting arms; and wherein a guide groove is defined in the guide rail along a circumference of the guide rail, the guide groove comprises a wide portion located closer to an inner circumferential surface of the guide rail than to an outer circumferential surface of the guide rail, and a narrow portion extending outwards from the wide portion and through the outer circumferential surface of the guide rail, the wide portion runs deeper than the narrow portion, and one end of the fixing bracket is received in the guide groove and slidable along the circumference of the guide rail.