Device for detecting position

Details Device for detecting position Device for detecting position

1995-07-26

1998-04-07

Nappi, Robert

Elevator, industrial lift truck, or stationary lift for vehicle

With monitoring, signalling, and indicating means

Monitors operational parameter

367124, B66B 134

Patent

active

057366950

ABSTRACT:
The position of an object which is moved along a prescribed path, for example an elevator cage, is continuously and accurately monitored by coupling an acoustic signal generator carried by the object to an acoustic signal conductor which extends along the path, the acoustic signal conductor being characterized by the velocity of sound propagation therealong being uniform and constant. The position of the object is calculated by processing signals generated by transducers located at the opposite ends of the acoustic signal conductor, the signal processing determining the delay between receipt of a sound signal originating at the object at the opposite ends of the conductor.

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patent: 5223680 (1993-06-01), Schmidt-Malkau et al.
patent: 5306882 (1994-04-01), Gerwing et al.
patent: 5509505 (1996-04-01), Steger et al.

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