Apparatus for determining the position of a moveable structure a

Details Apparatus for determining the position of a moveable structure a Apparatus for determining the position of a moveable structure a

1990-09-28

1992-02-25

Joyce, Harold

Ventilation

Workstation ventilator

Covered workbench chamber

B08B 1502

Patent

active

050903047

ABSTRACT:
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.

REFERENCES:
patent: 4893551 (1990-01-01), Sharp et al.

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