H - Electricity
01
H
340/135
H01H 35/00 (2006.01) E04B 7/02 (2006.01) G01M 5/00 (2006.01) G08B 21/18 (2006.01)
Patent
CA 1099366
ABSTRACT OF THE DISCLOSURE An alarm system for detecting downward bending of a roof under a snow load. A hanging member is pivotally connected to a rafter and is adjustable in length so that its bottom can be located a preset distance above a mat-type pressure switch supported on the joists. When the roof deflects sufficiently, the bottom of the hanging member presses the mat switch and changes the switch condition, triggering an alarm.
304300
Bereskin & Parr
Coon David
LandOfFree
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