Magnetic actuator for mechanical indicator of change of state in

Details Magnetic actuator for mechanical indicator of change of state in Magnetic actuator for mechanical indicator of change of state in

1985-10-03

1987-04-21

Levy, Stewart J.

Measuring and testing

Miscellaneous

H01H 900

Patent

active

046586466

ABSTRACT:
A magnetic detector for detecting a change of state in a pipeline, primarily a passage of a marking pig, is disclosed. The actuator has a detector housing and an actuator housing. A piston extends from the detector housing into the pipeline, and is moveable by passage of a pig. A primary permanent magnet coupled to the piston moves in response to the passage of a pig. The actuator housing is adjacent the detector housing and a secondary hammer magnet is located in the actuator housing adjacent the location of the primary magnet in the detector housing. As the primary magnet moves in response to the passage of a pig, the magnetic field produced by the primary magnet moves, interacting with the hammer magnet, which also moves. As the hammer magnet moves, its supporting linkage enters a field generated by a third booster magnet. The booster magnet attracts the hammer magnet and associated linkage toward it. A hammer is connected to the hammer magnet support linkage. As the booster magnet attracts the hammer magnet linkage toward it, the hammer strikes a firing pin, which releases a mechanical flag, thereby signaling passage of a pig, or other change of state in the pipeline.

REFERENCES:
patent: 2310504 (1943-02-01), Aubert
patent: 2419942 (1947-05-01), Brewer
patent: 2667631 (1954-01-01), Schuarte
patent: 2892051 (1959-06-01), Moore
patent: 3140690 (1964-07-01), Siebel
patent: 3262417 (1966-07-01), Zimmer
patent: 3271708 (1966-09-01), McCormick
patent: 3421124 (1969-01-01), Kidd
patent: 3478717 (1969-11-01), Kidd
patent: 3569648 (1971-03-01), Meyer
patent: 4491018 (1985-01-01), Stringer et al.

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