Low friction insertion structure and method of making

Abstract

A container in which are integral guides for slideably accepting opposite side edges of a sheet of material such as an electronic circuit board makes use of oppositely disposed cold walls in each of which are slots for reception of edges of the circuit boards. In each slot is a rotating camming bar for firmly fastening the corresponding edge of the board in good heat conducting relationship with the cold wall. Each cold wall features a single integral panel of metal having an inside face in which slots are aligned in parallel relationship. Each slot is formed by three successive passes of milling cutters, namely, a first cutter forming an initial channel of rectangular cross-sectional shape, followed by a second cutter productive of an arcuately recessed pocket in one wall of the initial channel. Thereafter a third cutter, when driven through the initial channel, is productive of an auxiliary T-shaped groove in the bottom wall of the initial channel. The auxiliary groove is cut at depth leaving a portion of original panel material between the crossbar of the T-shaped groove and the exterior surface of the panel. The T-shaped groove is for reception of a retention spring. The exterior surface of the panel may include preformed auxiliary heat dissipating fins.