Well casing finder instrument with movable magnet and magnetical

Details Well casing finder instrument with movable magnet and magnetical Well casing finder instrument with movable magnet and magnetical

1978-11-02

1980-08-26

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Magnetic sensor within material

166 65M, 324 67, 335205, G01R 3300, H01H 3600

Patent

active

042197732

ABSTRACT:
Instrument for locating the depth of the lower end of a mild steel or cast iron well casing or a plastic casing attached to a mild steel well screen has an elongated weighted body portion containing one fixed magnet engageable with the casing and located at the upper end of the instrument. A radially movable magnet is encapsulated in the body of the instrument, preferably at a lower location than the fixed magnet. The movable magnet is normally magnetically biased toward the casing when a ferrous casing or well screen is present adjacent the instrument but is magnetically urged toward the ferrous metal contacts of a switch located internally of the instrument to actuate a signal device when there is no ferrous casing or well screen adjacent the movable magnet. The instrument is suspended in the casing by a cable containing electrical conductors attached to the switch contacts and to the signal device.

REFERENCES:
patent: 2580457 (1952-01-01), Norris
patent: 2971381 (1961-02-01), Tesi
patent: 3234455 (1966-02-01), Idel
patent: 3250875 (1966-05-01), Wintriss
patent: 3303457 (1967-02-01), Akesson
patent: 3363208 (1968-01-01), Galet
patent: 3564171 (1971-02-01), Hammond
patent: 3691490 (1972-09-01), Ragni
patent: 3896280 (1975-07-01), Blake
patent: 4074095 (1978-02-01), Romanowski

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