F - Mech Eng,Light,Heat,Weapons – 24 – F
Patent
F - Mech Eng,Light,Heat,Weapons
24
F
F24F 11/00 (2006.01) B08B 15/02 (2006.01) G05D 3/14 (2006.01)
Patent
CA 2055258
A sensing means for determining the absolute position of one or more structures such as doors, windows or the like that are moveable in sets of tracks. Apparatus comprises an electrical switching means having an elongated electrical resistance means with a predetermined resistance value per unit length located adjacent to one of the sash doors, actuator means associated with the sash doors for operating said switching means, circuit means adapted to provide a substantially constant electrical current through a portion of said resistance means between an end portion of said resistance means and the nearest switch location, said circuit means thereby providing a voltage signal having a magnitude that is proportional to the distance between said end portion of said resistance means and the switch location.
Egbers David A.
Jacob Steven D.
Macrae & Co.
Siemens Building Technologies Inc.
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