Position sensing apparatus

Details Position sensing apparatus Position sensing apparatus

G - Physics

01

B

G01B 7/14 (2006.01) B08B 15/02 (2006.01)

Patent

CA 2120196

POSITION SENSING APPARATUS Abstract of the Disclosure Apparatus for use in determining the position of an object such as a sash door of a laboratory fume hood which has an elongated base member for attachment to the fume hood adjacent the sash doors. It includes an electrical switching means having an elongated electrical resistance means that provides a signal indicative of the position of a sash door, and an actuator means associated with each sash door adapted to move when the sash door is moved. The actuator means includes an actuator assembly positioned to operate the switching means at a switch location that varies as the sash door is moved. The actuator means includes a linkage means that permits accurate operation even though there is undesir- able movement of the door relative to the base member.

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