Mine cage position describer

Details Mine cage position describer Mine cage position describer

1978-09-27

1980-08-19

Caldwell, Sr., John W.

Communications: electrical

Selective

Having indication or alarm

340 23, B66B 302

Patent

active

042186714

ABSTRACT:
A mine cage position describer used for monitoring movement of a member along an elongate path which includes a magnetizable component extensible along the elongate path. The component is magnetized inducing an electrical field to be generated which defines a wave-like pattern of constant pitch. The equipment includes a magnetic detector component comprising two magnetic sensors arrangeable adjacent to the magnetizable component and spared from one another. The two magnetic sensors derive a first electrical signal and a second electrical signal in response to the magnetic field. The electrical signals vary with the wave-like pattern of the magnetic field and are out of phase by an amount dependent on the spacing of the sensors. Error detection means detect circuit faults which could produce misleading positional data.

REFERENCES:
patent: 3048818 (1962-08-01), Burckhardt et al.
patent: 3199630 (1965-08-01), Engel et al.
patent: 3654549 (1972-04-01), Maurer et al.
patent: 3786411 (1974-01-01), Kurauchi et al.
patent: 3967064 (1976-06-01), Sigworth

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