Northern Telecom Limited

David Campbell

Leonard J Charlebois

Allan P Brown

Alexander F Campbell

Gilles L Dufresne

George V Devlin

In a low pressure mold, the mold parts have surfaces for forming a mold cavity and which are covered in a thermally insulating coating with a thickness from 0.005 inches to 0.050 inches. The coating may be formed from epoxy resin or polytetrafluorethylene. Also provided is a sealing member for a low pressure mold, the sealing member having in-series edge regions around a body and each edge region is formed with a semi-circular sealing edge or arrangement of edges. The sealing edge or arrangement of edges of each edge region is different from other edge regions. When the two sealing members are mounted upon mold halves at each end of a low pressure mold, they may be changed in position to locate any associated pair of sealing edges in opposition across the mold closure line.

Apparatus for manufacture of sealing closures for a telecommunications

An enclosure for electrical equipment is arranged in sections, typically vertical and with an equipment mounting section at the front and an air passage section at the rear. Air is constantly circulated through the two sections, in a closed loop, to maintain an even temperature and avoid hotspots in the enclosure. At the top, one or more fans are positioned over each section, and an air inlet and an air outlet are provided. A pivotal baffle has two positions. In one it shuts off access to the inlet and outlet and permits the closed circulation of air. In the other position it shuts off circulation between sections at one end and opens access to the inlet and outlet, giving an air circulation from the inlet, through the sections and out of the outlet. An additional fan can be switched on for the latter form of circulation.

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Nepean, Canada

David Campbell