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US 6,189,838 B1Granted
Position detector for track mounted surveillance systems
AssigneeSentry Technology Corp.
InventorsThomas A. Nicolette, Peter Y. Zhou, Lawrence Chao
Life of this patent
Estimating the term…
Abstract
A mechanism for detecting the position of a carriage moveable along a track. The mechanism includes a wheel fixed to the carriage which rotates as the carriage moves along the track. A mark is disposed on a portion of the wheel. A detector is fixed to the carriage for sensing the mark as the wheel rotates and outputs a signal in response. A carriage processor receives the signal and determines the position of the carriage along the track.
Claims8
A mechanism comprising:
- a track;
- a carriage moveable along said track;
- a wheel fixed to said carriage, said wheel rotating as said carriage moves along said track;
- a mark disposed on a portion of said wheel;
- a detector fixed to said carriage for sensing said mark as said wheel rotates and outputting a signal indicative of said mark being sensed by said detector;
- a carriage processor for receiving said signal and determining the position of said carriage along said track;
- and
- at least one limit switch disposed at a predetermined position on the track, said at least one limit switch detecting the presence of said carriage and outputting a limit signal to said carriage processor indicating position of said carriage.
5 more elements
Dependencies are inferred from the claim text.