Apparatus, system, and method for dynamic compensation of heatsink-clamping mechanisms

Patent metadata

Field	Value
Publication number	US-11158564-B1
Application number	US-202017135133-A
Country	US
Kind code	B1
Filing date	Dec 28, 2020
Priority date	Jul 30, 2019
Publication date	Oct 26, 2021
Grant date	Oct 26, 2021

Abstract

The disclosed apparatus may include (1) a shoulder bolt that includes (A) a head and (B) a shank, (2) a retention barrel that envelops at least a portion of the shank of the shoulder bolt, (3) a coil spring that envelops at least a portion of the shank of the shoulder bolt and resides between the head of the shoulder bolt and a heatsink, and (4) a travel-limiting component (such as a set screw or a sleeve) that (A) is coupled to the retention barrel and (B) limits the heatsink from travelling linearly beyond a travel threshold via the coil spring. Various other apparatuses, systems, and methods are also disclosed.

First claim

What is claimed is:

1. An apparatus comprising:
a shoulder bolt that includes:
a head; and
a shank;

a retention barrel that envelops at least a portion of the shank of the shoulder bolt;
a coil spring that envelops at least a portion of the shank of the shoulder bolt and resides between the head of the shoulder bolt and a heatsink; and
a travel-limiting component that:
is coupled to the retention barrel; and
limits the heatsink from travelling linearly beyond a travel threshold via the coil spring; and

wherein the retention barrel resides between the heatsink and the shank of the shoulder bolt.

2. The apparatus of claim 1 , wherein the travel-limiting component comprises a set screw that is inserted laterally into a threaded hole formed in the retention barrel such that:
the shoulder bolt and the set screw are oriented perpendicular to one another; and
the set screw controls a positioning of the retention barrel relative to the shoulder bolt.

3. The apparatus of claim 2 , wherein the heatsink is coupled to the retention barrel such that, when the shoulder bolt is mounted to a circuit board, the retention barrel secures the heatsink against an electronic component included on the circuit board.

4. The apparatus of claim 2 , wherein the shoulder bolt further includes:
a thread located opposite the head;
a distal step on the shank; and
a proximal step on the shank, wherein the proximal step is located between the distal step and the thread.

5. The apparatus of claim 4 , further comprising a backplate that includes a threaded receptacle fitted for the thread of the shoulder bolt; and
wherein:
the heatsink is coupled to the shoulder bolt; and
when the thread of the shoulder bolt is inserted into the threaded receptacle of the backplate, the retention barrel is pressed against a circuit board that resides between the heatsink and the backplate and, in conjunction with the head of the shoulder bolt, compresses the coil spring.

6. The apparatus of claim 5 , wherein:
the distal step on the shank corresponds to a pre-mount position in which:
the coil spring is compressed below a compression threshold; and
the set screw rests against the proximal step inside the retention barrel;

the proximal step on the shank corresponds to a post-mount position in which:
the coil spring is compressed above the compression threshold; and
the set screw rests against the distal step inside the retention barrel.

7. The apparatus of claim 6 , wherein:
the pre-mount position increases the travel threshold relative to the post-mount position; and
the post-mount position decreases the travel threshold relative to the pre-mount position.

8. The apparatus of claim 5 , wherein:
the shoulder bolt is inserted into the threaded receptacle by rotating the shoulder bolt in a certain direction; and
as the shoulder bolt is rotated in the certain direction, the set screw transitions from the distal step to the proximal step along the shank of the shoulder bolt.

9. The apparatus of claim 5 , further comprising:
an additional shoulder bolt that includes:
an additional head; and
an additional shank;

an additional retention barrel that envelops a lower portion of the additional shank of the additional shoulder bolt;
an additional coil spring that envelops an upper portion of the additional shank of the additional shoulder bolt and resides between the additional head of the additional shoulder bolt and the additional retention barrel; and
an additional set screw that is inserted laterally into an additional threaded hole formed in the additional retention barrel such that:
the additional shoulder bolt and the additional set screw are oriented perpendicular to one another; and
the additional set screw controls a positioning of the additional retention barrel relative to the additional shoulder bolt.

10. The apparatus of claim 9 , wherein the heatsink is further coupled to the additional shoulder bolt such that, when the shoulder bolt and the additional shoulder bolt are mounted to the circuit board, the shoulder bolt and the additional shoulder bolt collectively secure the heatsink against an electronic component included on the circuit board.

11. The apparatus of claim 4 , wherein the shoulder bolt further comprises a lip that abuts the distal step opposite the proximal step on the shank.

12. The apparatus of claim 4 , wherein the proximal step comprises a groove formed in the shank of the shoulder bolt.

13. The apparatus of claim 1 , wherein the travel-limiting component comprises a sleeve that covers at least a portion of the shank of the shoulder bolt and resides between the retention barrel and the coil spring.

14. The apparatus of claim 1 , further comprising a flange washer that resides between the head of the shoulder bolt and the coil spring and holds the coil spring between the head of the shoulder bolt and the retention barrel.

15. The apparatus of claim 1 , wherein at least one of:
the portion of the shank of the shoulder bolt enveloped by the retention barrel is identical to the portion of the shank of the shoulder bolt enveloped by the coil spring; or
the portion of the shank of the shoulder bolt enveloped by the retention barrel is different than the portion of the shank of the shoulder bolt enveloped by the coil spring.

16. A system comprising:
a heatsink; and
a spring-loaded clamping mechanism for securing the heatsink to an electronic component included on a circuit board, wherein the spring-loaded clamping mechanism comprises:
a shoulder bolt coupled to the heatsink, wherein the shoulder bolt includes:
a head; and
a shank;

a retention barrel that envelops at least a portion of the shank of the shoulder bolt and resides between the heatsink and the shank of the shoulder bolt;
a coil spring that envelops at least a portion of the shank of the shoulder bolt and resides between the head of the shoulder bolt and the heatsink; and
a travel-limiting component that:
is coupled to the retention barrel; and
limits the heatsink from travelling linearly beyond a travel threshold via the coil spring.

17. The system of claim 16 , wherein the travel-limiting component comprises a set screw that is inserted laterally into a threaded hole formed in the retention barrel such that:
the shoulder bolt and the set screw are oriented perpendicular to one another; and
the set screw controls a positioning of the retention barrel relative to the shoulder bolt.

18. The system of claim 17 , wherein the heatsink is coupled to the retention barrel such that, when the shoulder bolt is mounted to the circuit board, the retention barrel secures the heatsink against the electronic component included on the circuit board.

19. The system of claim 16 , wherein the travel-limiting component comprises a sleeve that covers at least a portion of the shank of the shoulder bolt and resides between the retention barrel and the coil spring.

20. A method comprising:
assembling a spring-loaded clamping mechanism by:
placing a coil spring over at least a portion of a shoulder bolt;
placing a retention barrel over at least a portion of the shoulder bolt such that the coil spring resides between a head of the shoulder bolt and a heatsink and the retention barrel resides between the heatsink and the shank of the shoulder bolt; and
coupling a travel-limiting component to the retention barrel such that the retention barrel limits the heatsink from travelling linearly beyond a travel threshold via the coil

Assignees

• Juniper Networks Inc

Inventors

• Yatskov Alexander I
• Tolentino Elmer
• Ganguly Gautam
• Leung Jimmy Chun-Chuen

Classifications

• H10W40/625

  Clamping parts not primarily conducting heat · CPC title

• H10W40/233

  attached to chips · CPC title

• H10W40/231

  characterised by their places of attachment or cooling paths · CPC title

• H10W40/60

  Securing means for detachable heating or cooling arrangements, e.g. clamps · CPC title

• H10W40/611 Primary

  Bolts or screws · CPC title