Device to monitor movement of a surface

Details Device to monitor movement of a surface Device to monitor movement of a surface

1978-01-11

1979-01-30

Myracle, Jerry W.

Communications: electrical

Condition responsive indicating system

Specific condition

73781, 73784, G01N 3324

Patent

active

041365569

ABSTRACT:
A device to monitor movement of a surface such as, for example, the roof of a mine tunnel or the like and to provide an indication if that movement exceeds some predetermined creep rate or velocity. The device includes a sensing member formed of a material whose precise creep characteristics as a function of stress and strain are known. The device includes a sensing member formed of a material whose precise creep characteristics as a function of stress and strain are known.

REFERENCES:
patent: 3111655 (1963-11-01), Kotarsky et al.
patent: 3600938 (1971-08-01), Waddell

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