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Design for a heat sink with integrated retention

IP.com Disclosure Number: IPCOM000005432D
Publication Date: 2001-Oct-02
Document File: 3 page(s) / 5M

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a design for a heat sink with integrated retention. Benefits include lower part count and cost, and ease of handling.

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Design for a heat sink with integrated retention

Disclosed is a design for a heat sink with integrated retention. Benefits include lower part count and cost, and ease of handling.

Description

      The disclosed method is a design for a heat sink assembly consisting of a heat sink (aluminum extrusion) and a torsion spring clip (wire with multiple bends). Specifically, the disclosed design is based on unique geometric features in both parts that enable their permanent joining using a simple mechanical process. The spring clip central section has a jog in the middle for a small portion of its length (see Figures 1 & 3). The aluminum extrusion has a special channel in which the central section of the spring clip fits (see Figure 2). When the spring is dropped into the channel, the edges of the channel are deformed in two spots outside of the clip jog zone (see Figure 3). These two swaged spots capture the spring clip creating a permanent assembly with the extrusion. The spring is also unable to slide axially in the channel given that its jog is trapped between the two swaged spots (see Figure 3). The assembly is installed by placing the heat sink body on the chip and hooking the ends of the spring clip onto symmetrically opposed anchor loops that are attached to the PCB.

Advantages

              A conventional solution contains an aluminum extrusion and a spring, but the two parts are held together by means of a special steel clip. The disclosed method includes a spring that is attached to the hea...