Mine roof movement monitor

Details Mine roof movement monitor Mine roof movement monitor

G - Physics

01

B

340/135, 116/72

G01B 5/14 (2006.01) E21D 21/00 (2006.01) E21F 17/18 (2006.01)

Patent

CA 1089051

ABSTRACT OF THE DISCLOSURE Movement of the roof of a mine shaft is detected by unlatching of a position sensing device in an elevated potion 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.

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