Northern Telecom Limited

Peter P Unterhoffer

Gilles L Dufresne

A weatherproof structure for a double-door closing of an unobstructed door opening has an uninterrupted, continuous, gutter along the top of the door opening. The continuous channel or gutter has an open side facing outwards with the open side having a low wall. A channel at the inner edge of a first door has an open side facing outward, the channel extending inward from the outer surface of the door, the door also having an inturned upper edge. A second door has an inturned upper edge and inner edge, the inturned inner edge entering the channel at the inner edge of the first door. A recess extends into the channel at the inner edge of the first door, from an inner surface, the recess admitting the low wall of the continuous gutter or channel. A slot in the inturned inner edge of the second door fits over the recess in the channel at the inner edge of the first door. Gaskets can be provided to enhance sealing. The structure can be repeated for the bottom of the door opening. For an enclosure, the double door structure can be on one side or both sides. Latches provide a closing force to enhance sealing.

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Nepean, Canada

Peter P Unterhoffer