U.S. Elevator, Corporation

United States Elevator Corp.

Richard E Watt

Larry W Lind

John H Parker

Willilam R Hoelscher

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.

Elevator position sensing system using coded vertical tape

An elevator control and indicator device comprises an assembly incorporating a circuit for mounting on a panel. The control circuit is connected to a piezoelectric element for generating an elevator control pulse in response to an output signal from the element. The circuit further comprises transient voltage suppression diodes shunted across the piezoelectric element and the transistor output. The device also can be configured to provide an indication of the position of an elevator car.

Elevator control and indicator device

An elevator control switch and position indicator assembly for mounting on a panel comprises a piezoelectric element and a control circuit connected to the element for generating an elevator control pulse in response to an output signal from the element. A push button assembly is arranged such that when the push button is operated, a force is applied to the piezoelectric element, and the push button assembly is restrained so that it can only deflect the element a predetermined distance sufficient to produce an output signal. The assembly further comprises an integral indicator device for providing an indication to the operator that an elevator control signal has been generated. The invention also can be configured to provide an indication of the position of an elevator car.

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Spring Valley, CA, United States of America

Richard E Watt