Northern Telecom Limited

Alexander F Campbell

Kenneth Roy Perry

Gilles L Dufresne

David Campbell

George V Devlin

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.

Enclosure for electrical and electronic equipment with temperature

A lockable band clamp, such as clamping together the rims of a housing and a base of an equipment housing, has a flexible band with Vee-shaped portions for positioning around the rims, the rims positioned in the Vee-shaped portions. The ends of the band have end members through which passes a bolt, a tubular member threading on to the bolt. Relative rotation between bolt and tubular member acts to pull the end members together and tighten the band about the rims. The end members have projections which overlap. A locking member which, in a locked position, engages at one end over a rod through the tubular member and at the other end aligns with holes in the projections whereby a padlock can pass through the holes and a formation on the locking member, preventing relative rotation between bolt and tubular member.

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Woodlawn, Canada

Alexander F Campbell