CPU heat sink fastener

A CPU heat sink fastener includes a retainer member having two V-shaped arms extended from a flat base thereof and respectively hooked in respective locating holes on a CPU module to hold down a heat sink on the CPU module, and a holding down member having a longitudinal slot forced into engagement with the V-shaped arms. The holding down member is pushed to a position below reinforcing ribs at the V-shaped arms to force the V-shaped arms inwards and to secure the retainer member in place.

BACKGROUND OF THE INVENTION 
The present invention relates to a CPU heat sink fastener for fastening to 
a CPU module to secure a heat sink to the CPU module, and more 
particularly to such a CPU heat sink fastener which has a simple 
structure, and can easily be positively installed. 
Various CPU heat sink fasteners have been developed for use in securing a 
heat sink to a CPU module. These heat sink fasteners commonly use the 
curved spring plate to secure a heat sink to the CPU module, and lock 
levers to lock the curved spring plate in position. However, the lock 
levers tend to be forced out of locking position during delivery. 
SUMMARY OF THE INVENTION 
It is one object of the present invention to provide a CPU heat sink 
fastener which can easily be installed to firmly secure a heat sink to a 
CPU module. It is another object of the present invention to provide a CPU 
heat sink fastener which is firmly secured in position when installed. 
According to the invention, the CPU heat sink fastener comprises a 
retainer member having two V-shaped arms extending from a flat base 
thereof and respectively hooked in respective locating holes on a CPU 
module to hold down a heat sink on the CPU module, and a holding down 
member having a longitudinal slot forced into engagement with the V-shaped 
arms and positioned below reinforcing ribs on the V-shaped arms to force 
the V-shaped arms inwards and to secure the retainer member in place.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
Referring to FIGS. 1 and 2, a CPU heat sink fastener in accordance with the 
present invention is generally comprised of a retainer member 1, and a 
holding down member 2. While two fasteners are illustrated and preferred, 
those skilled in the art will appreciate that one of the fasteners could 
possibly be eliminated or replaced by a conventional fastener. The 
retainer member 1 comprises a narrow, elongated, flat horizontal base 12, 
two substantially narrow, elongated, flat, V-shaped arms 11 extending from 
two opposite ends of the horizontal base 12 and terminating in a 
respective hooked portion 111, pairs of upright reinforcing flanges 121 
symmetrically raised from two opposite long sides of the horizontal base 
12, and two reinforcing ribs 112 respectively provided on the V-shaped 
arms 11. The holding down member 2 is an elongated member having a 
longitudinal slot 21, and two downwardly extended vertical reinforcing 
flanges 22 at two opposite long sides of the longitudinal slot 21. 
Referring to FIGS. 3 and 4, when in use, the horizontal base 12 of the 
retainer member 1 is closely attached to the top side wall of the heat 
sink 3. Then the hooked portions 111 of the V-shaped arms 11 of the 
retainer member 1 are respectively hooked in respective locating holes 42 
on the CPU module 4 to secure the heat sink 3 to the CPU module 4, and the 
holding down member 2 is fastened to the retainer member 1 by forcing the 
longitudinal slot 21 into engagement with the V-shaped arms 11, and 
causing two opposite end edges of the longitudinal slot 21 of the holding 
down member 2 to be positioned below the reinforcing ribs 112 of the 
V-shaped arms 11. 
Referring to FIGS. 5 and 6, the V-shaped arms 11 of the retainer member 1 
are springy, and therefore the hooked portions 111 of the V-shaped arms 11 
can be conveniently hooked in the respective locating holes 42 on the CPU 
module 4. When the holding down member 2 is forced into engagement with 
the V-shaped arms 11 and positioned below the reinforcing ribs 112, the 
holding down member 2 imparts an inward pressure to the V-shaped arms 11, 
thereby causing the hooked portions 111 of the V-shaped arms 11 to be 
firmly secured to the respective locating holes 42 on the CPU module 4. 
Because the holding down member 2 is stopped below the reinforcing ribs 
112 of the V-shaped arms 11, the holding down member 2 is firmly retained 
by the retainer member 1. 
While only one embodiment of the present invention has been shown and 
described, it will be understood that various modifications and changes 
could be made thereunto without departing from the spirit and scope of the 
invention disclosed.