Mine roof movement monitor

Details Mine roof movement monitor Mine roof movement monitor

1978-02-08

1979-05-22

Yusko, Donald J.

Communications: electrical

Condition responsive indicating system

Specific condition

73784, 405259, E21D 2100, G08B 2100

Patent

active

041562364

ABSTRACT:
Movement of the roof of a mine shaft is detected by unlatching of a position sensing device in an elevated position causing it to drop to a lowered position pivotally suspended by a link from a bracket yieldably held in abutment with the roof ceiling. The bracket is positioned on the lower end of an elongated support bolt by a nut acting as a latch releasing member engageable with a latch element connected to the link for latched support of the sensing device in the elevated position.

REFERENCES:
patent: 3111655 (1963-11-01), Kotarsky et al.
patent: 3594773 (1971-07-01), Conkle et al.
patent: 3646553 (1972-02-01), Conkle
patent: 4001942 (1977-01-01), Schuermann et al.

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