Retainer for heat sink

1. A retainer for a heat sink, comprising:

a retention module adapted for surrounding the heat sink; and

two clip members for cooperating with the retention module to retain the heat sink, each clip member comprising:

a strap adapted for resting on the heat sink;

a pair of legs located at opposite ends of the strap and engagable with the retention module, at least one of the legs being pivotably attached to one of opposite ends of the strap, friction between said leg and the strap being capable of holding said leg at any position between a released position at which said leg is free from restriction of the retention module and an engaged position at which said leg is engaged with the retention module; and

at least one protrusion formed on the strap, wherein the at least one protrusion is for engaging with the heat sink so as to locate the clip members on the heat sink.

2. The retainer as described in claim 1 , wherein the strap defines a through groove spanning from one end thereof to an opposite end thereof.

3. The retainer as described in claim 2 , wherein a portion of said leg is received in the groove of the strap, and a thickness of said portion of said leg is slightly greater than a width of the groove of the strap before said portion is received in the groove.

4. The retainer as described in claim 3 , wherein said leg comprises a main body.

5. The retainer as described in claim 4 , wherein said leg further comprises a handle connected with a top end of the main body.

6. The retainer as described in claim 4 , wherein at least one end portion of the strap defines two coaxial pivot holes communicating with the groove, and opposite sides of an upper portion of said leg form a pair of pivots received in the corresponding pivot holes of the strap.

7. The retainer as described in claim 1 , further comprising a lever with a cam pivotably attached to a middle portion of the strap.

8. The retainer as described in claim 1 , further comprising a pair of supporting members for mounting to the heat sink, each supporting member having at least one cutout, wherein the strap rests on a corresponding supporting member with the at least one protrusion inserting into the at least one cutout of the corresponding supporting member, and wherein the clip members engage with the heat sink via the supporting members so as to locate the clip members on the heat sink.

9. The retainer as described in claim 8 , wherein each of the clip members further comprises a pressing pad formed below the strap and resting on the corresponding supporting member.

10. The retainer as described in claim 9 , wherein the at least one protrusion extends from the pressing pad.

11. The retainer as described in claim 8 , wherein the supporting members each define a pair of cutouts, and each of the clip members comprises two protrusions received in the cutouts of the each supporting member respectively.

12. The retainer as described in claim 1 , wherein the engagements between the protrusions of the two clip members prevent each of the two clip members from moving relative to the heat sink along two perpendicular directions.

13. A heat dissipating device assembly for a heat generating unit, comprising:

a heat sink adapted for being placed on the heat generating unit;

a retainer for mounting the heat sink to the heat generating unit, comprising a retention module adapted for being located about the heat generating unit, and two clip members each comprising:

a strap resting on the heat sink;

a pair of legs located at opposite ends of the strap, at least one of the legs being movably attached to one of opposite ends of the strap and being holdable by the strap at a released position at which said leg is free from restriction of the retention module; and

a lever attached to the strap and being pivotable from a first position to a second position to cause the legs to engage with the retention module, and to have the lever pressing the heat sink toward the heat generating unit;

wherein the heat sink comprises a base and a plurality of fins, and opposite sides of the fins form a pair of shoulders therein;

wherein a pair of supporting members is attached on the shoulders, and the clip members further comprise pressing pads formed below the straps and resting on the corresponding supporting members; and

wherein each supporting member defines a pair of aligned cutouts, and each pressing pad of the clip member forms two aligned protrusions received in the cutouts of the supporting member respectively.

14. The heat dissipating device assembly as described in claim 13 , wherein the strap defines a through groove spanning from one end thereof to an opposite end thereof.

15. The heat dissipating device assembly as described in claim 14 , a portion of said leg is received in the groove of the strap, and a thickness of said portion of said leg is slightly greater than a width of the groove of the strap before said portion is received in the groove.

16. The heat dissipating device assembly as described in claim 13 , wherein said legs each further comprise a handle connected with a top end of the each leg.

17. The heat dissipating device assembly as described in claim 13 , further comprising a fan mounted on the supporting members.

18. A clip member for cooperating with a retention member to retain a heat sink, the clip member comprising:

a strap defining a through groove spanning from one end thereof to an opposite end thereof;

a pair of legs located at opposite ends of the strap, at least one of the legs being pivotably attached to one of opposite ends of the strap and one portion of said at least one leg being interferentially received in the groove whereby said leg is capable of being held at a release position at which said leg is free from restriction of the retention member; and

a cam-type lever pivotably attached to the strap so as to move said heat sink in a direction away from said lever.

19. The clip member as described in claim 18 , further comprising a pressing pad formed below the strap for pressing the heat sink.

20. The clip member as described in claim 18 , further comprising a handle defined from each of said pair of legs.