Patent ID: 6141220
Filing Date: 2000-10-31
Classification: H01L

Abstract:
A central processing unit (CPU) heat sink mounting arrangement, comprising:a circuit board having a central processing unit, said circuit board having four first holes spaced around said central processing unit;a heat sink mounted on a top side of said circuit board and maintained in contact with said central processing unit, said beat sink comprising a plurality of radiating fins raised from a bottom wall of said heat sink, two sliding tracks arranged in parallel at a top side of said heat sink, and four second holes in said sliding tracks through said bottom wall and corresponding to the first holes in said circuit board;a positioning plate having a top side attached to a bottom side of said circuit board, said positioning plate comprising four upright mounting rods respectively inserted through the first holes in said circuit board and the second holes in said heat sink, each one of said upright mounting rods having a free end remote from said positioning plate and a neck near the respective free end; andtwo locking plates respectively mounted in said sliding tracks of said heat sink and fastened to said upright mounting rods of said positioning plate to lock said heat sink, said central processing unit and said positioning plate together;each one of said locking plates comprising a locator formed on one end, said locator being forced into engagement with one end of any one of said sliding tracks of said heat sink, a finger manipulatable strip at an opposite end of said locking plates accommodating manual manipulation by a finger of a user, two spring strips obliquely upwardly raised from a top side wall of each one of said locking plates and spaced between said locator and said finger manipulatable strip, said spring strips each having a fixed end formed integral with the respective locking plate and a free end, a third hole disposed in the fixed end of each one of said spring strips, the third hole being aligned with one of the second holes in said heat sink accommodating insertion of the corresponding upright rod of said positioning plate when said locator is fastened to said heat sink, and each one of said spring strips having an elongated sliding slot, the elongated sliding slot extending from the third hole toward the free end of each one of said spring strips, the elongated sliding slot removably engaging the neck of a corresponding upright mounting rod of said positioning plate as each free end is moved toward a corresponding upright mounting rod.