Position or movement sensor, e.g. for conveyances such as lifts

Details Position or movement sensor, e.g. for conveyances such as lifts Position or movement sensor, e.g. for conveyances such as lifts

1980-07-03

1982-07-27

Robinson, Thomas A.

Communications: electrical

Selective

Having indication or alarm

340 24, 340553, G08G 101, B66B 302, G01D 500

Patent

active

043420214

ABSTRACT:
A position or movement sensor responsive to movement of a mine cage (26) in a mineshaft comprises a leaky coaxial cable (12) extending along the path of the cage, and an oscillator (40) and associated circuitry (42, 44, 14) for forming an electromagnetic standing wave in the cable. The cage carries a resonator (28) which moves adjacent the cable, causing a cyclical change in the cable characteristics as seen from a detector probe (30) at the top end of the cable. Detection and counting circuitry (32) detects and indicates movement of the cage by reference to the standing wave pattern.

REFERENCES:
patent: 2580155 (1951-12-01), Brannen
patent: 3560970 (1971-02-01), Kamimura et al.
patent: 3668625 (1972-06-01), Wolf
patent: 3711203 (1973-01-01), Sato et al.
patent: 4215341 (1980-07-01), Cole
patent: 4218671 (1980-08-01), Lewis

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