Elevator – industrial lift truck – or stationary lift for vehicle – Stationary lift for roadway vehicle or required component... – Having specific drive means for support
Patent
1991-05-01
1992-08-04
Pellinen, A. D.
Elevator, industrial lift truck, or stationary lift for vehicle
Stationary lift for roadway vehicle or required component...
Having specific drive means for support
B66B 302
Patent
active
051350815
ABSTRACT:
A position sensing system includes a coded tape vertically mounted in an elevator shaft and a sensor unit mounted on an elevator car to detect code indicia on the tape. The sensor unit is connected to output circuitry for converting the sensor outputs to elevator position data for transmission to an elevator controller. The tape has two parallel tracks of indicia extending along its length. The first track comprises a pseudo-random code sequence which is non-repeating along any N successive bits for the length of the tape, and the sensor unit includes a first set of sensors for detecting the indicia in the first track and producing an N-bit output representative of a coarse elevator position. The second track has spaced indicia forming a fine scale between successive coarse code positions on the first track, and a second set of sensors detects the fine code indicia and produces fine code position information at successive points between each pair of coarse code positions as the sensors traverse the tape.
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Hoelscher Willilam R.
Parker John H.
Watt Richard E.
Colbert Lawrence E.
Pellinen A. D.
United States Elevator Corp.
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