Movable Transistor-To-Heat Sink Clamp
Original Publication Date: 1984-Jul-01
Included in the Prior Art Database: 2005-Feb-04
A commonly used method for mounting TO-220-type transistors to heat sink structures, indicated in Figs. 1 and 2, requires clearance space 10 for access to screw 11 which fastens transistor 12 to aluminum heat sink structure 13 projecting from printed circuit card 14. When such space is unavailable, the technique and fastening structure shown in Fig. 3 may be used. In this configuration, the transistor 12 is clamped to heat sink 13 by a steel spring clip 15, which itself is fastened to the heat sink by an eyelet or rivet 16. Slot 17 in the clip is engageable by a screw driver or other tool to pull the clip out of contact with the transistor's plastic body 18 (Figs. 4 and 5). When clear of the transistor, the clip can be rotated (Fig.