Heat sink apparatus

• US 6,219,246 B1
• Filed: 07/02/1999
• Issued: 04/17/2001
• Est. Priority Date: 07/02/1999
• Status: Expired due to Fees

• Current Assignee: General Signal Corporation (SPX Corporation)
• Original Assignee: Powerware Corporation (Eaton Corporation PLC.)
• Inventors: Edevold, Craig, Winch, Cary
• Primary Examiner(s): THOMPSON, GREGORY D
• Application Number:
  US09/347,828
• Time in Patent Office: 655 Days
• Field of Search: 165/80.2, 165/80.3, 165/185, 174/16.3, 257/707, 257/713, 257/718-719, 257/725-727, 361/688, 361/690, 361/704, 361/707, 361/709, 361/710, 361/715, 361/719, 361/720
• US Class Current: 361/707
• CPC Class Codes: H01L 23/3675 characterised by the shape of the housing
• CPC Class Codes: H01L 23/4093 Snap-on arrangements, e.g. clips
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/0002 Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00

Abstract

A heat sink apparatus for drawing heat from one or more devices and a method of attaching such a heat sink to one or more devices is provided. The heat sink includes a mounting surface, which draws heat into the heat sink where it is dissipated by fins. The heat sink can be mounted next to the device to be cooled with minimum insertion force since the weight of the heat sink is borne by the printed circuit board upon which the electronic device is installed. A rotatable cam is turned by the user, which engages a pivot arm. The pivot arm rotates a number of spring clips against the device thereby holding it in place. Once in a fully closed position, the cam locks into place to prevent the pivot arm and spring clips from rotating back to an open position. The spring clips affix the heat sink and maintains contact between the mounting surface and the device being cooled. The individually articulated spring clips allow the heat sink to be mounted over multiple devices of various dimensions and locations along the heat sink.

Claims

1. A heat sink apparatus for dissipating heat generated by a device, comprising:

a thermally conductive body having a mounting surface, a holding member retainer, and defining a cam channel therein;

a holding member pivotally mounted in relation to said holding member retainer, said holding member defining a pivot arm portion and a spring clip portion; and

a cam rotatably mounted within said cam channel, said cam defining therein a V-shaped engagement surface adapted to receive said pivot arm portion of said holding member in a disengaged position wherein said spring clip portion of said holding member is positioned a maximum distance from said mounting surface; and

wherein rotation of said cam in a first direction pivots said pivot arm portion into an engaged position wherein said spring clip portion is positioned at a minimum distance from said mounting surface in a quiescent state.

2. The apparatus of claim 1, wherein said cam further defines a recessed portion adapted to engage an end of said pivot arm in said engaged position, and wherein said recessed portion prevents rotation of said cam in a direction opposite said first direction.

3. The apparatus of claim 1, wherein said spring clip portion is flexible in said engaged position to accommodate devices of different sizes.

4. The apparatus of claim 3, wherein said holding member includes a curved portion between said pivot arm portion and said spring clip portion, said curved portion accommodating said flexiblility of said spring clip portion in relation to said pivot arm portion.

5. The apparatus of claim 1, wherein said holding member further comprises a holding member stop positioned to engage said cam in said engaged position to maintain said holding member in place.

6. The apparatus of claim 1, wherein said body further includes a base formed to support a weight of said apparatus.

7. The apparatus of claim 1, wherein said base has a small surface area to minimize heat transfer therethrough.

8. The apparatus of claim 1, wherein said cam includes a portion extending beyond said body, said apparatus further comprising a cam actuator having a socket adapted to accept a cross-sectional shape of said cam, said cam actuator engaging said portion of said cam extending beyond said body and operable to impart rotation thereto.

9. The apparatus of claim 8, wherein said cam actuator is a wrench removable from said cam.

10. The apparatus of claim 1, wherein said holding member is formed such that said pivot arm portion and said spring clip portion are positioned in approximate perpendicular relation.

11. The apparatus of claim 10, wherein rotation of said cam imparts movement to said pivot arm in a direction relatively away from said mounting surface, and to said spring clip portion in a direction relatively toward said mounting surface.

22. The apparatus of claim 1, wherein said holding mechanism further includes a holding member stop positioned to engage an outer surface of said cam in said engaged position.

12. A heat sink apparatus, comprising:

a body having a mounting surface;

a flexible holding member having a first portion forming a spring clip and a second portion forming a pivot arm; and

a cam rotatably positioned within a cam chamber formed by said body; and

wherein rotation of said cam in a first direction transitions said holding member between a disengaged position and an engaged position, said cam defining a recessed portion in an outer surface thereof adapted to engage said pivot arm in said engaged position thereby preventing rotation of said cam in a second direction opposite to said first direction.

13. The apparatus of claim 12, wherein said cam defines therein a V-shaped engagement surface adapted to receive said pivot arm in said disengaged position.

14. The apparatus of claim 12, wherein said holding member further includes a curved portion between said pivot arm and said spring clip, wherein said body further includes a holding member retainer, and wherein said curved portion provides a pivotal coupling to said holding member retainer.

15. The apparatus of claim 14, wherein said pivot arm and said spring clip are formed in an approximately perpendicular relationship to one another.

16. The apparatus of claim 15, wherein rotation of said cam in said first direction imparts movement of said spring clip from said disengaged position at a first distance from said mounting surface to said engaged position at a second distance from said mounting surface, said first distance being greater than said second distance.

17. The apparatus of claim 12, wherein rotation of said cam in said first direction from said disengaged position to said engaged position transitions said pivot arm through a first arc of a first angle, and wherein said spring clip is flexible such that an angle of a second arc through which said spring clip is transitioned is at most equal to said angle of said first arc.

18. The apparatus of claim 17, having an external device is positioned between said mounting surface and said spring clip, wherein said angle of said second arc is less than said angle of said first arc.

19. The apparatus of claim 12, wherein said body includes a base having a small contact surface area to minimize heat transfer thereat.

20. The apparatus of claim 12, further comprising a cam actuator removably coupled to said cam.

21. The apparatus of claim 20, wherein said cam includes a portion extending beyond said body, and wherein said cam actuator includes a socket adapted to engage a cross-sectional shape of said cam.

23. A heat sink apparatus comprising a body having a mounting surface adapted to provide thermal contact to a device, and a holding member adapted to provide a clamping force to hold the device in close contact with the mounting surface, the holding member including a pivot arm portion adapted to engage a rotatable cam positioned in said body, said cam positioning said holding member in an engaged and a disengaged position upon rotation thereof, said holding member further defining a flexible spring clip portion adapted to accommodate devices of different sizes in said engaged position.

24. The heat sink of claim 23, wherein the cam includes a portion adapted to engage said pivot arm to prevent movement from said engaged to said disengaged positions by reverse rotation of said cam.