Piezoelectric stress indicator for mine roofs

Details Piezoelectric stress indicator for mine roofs Piezoelectric stress indicator for mine roofs

1977-07-08

1978-11-28

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310334, 310338, H01L 4110

Patent

active

041277880

ABSTRACT:
A device for detecting deformations in mine roofs wherein an open cylindrical casing having inner and outer threaded surfaces is threaded into the mine roof. A piezoelectric crystal is mounted within the casing to sense the deformations and stresses in the mine roof. Provision is made for mounting a plurality of piezoelectric crystals within the casing whereby stresses at varying locations are sensible.

REFERENCES:
patent: 1495429 (1924-05-01), Nicolson
patent: 2216966 (1940-10-01), Swift
patent: 2250496 (1941-07-01), Postlethwaite
patent: 2558563 (1951-06-01), Janssen
patent: 2917642 (1959-12-01), Wright et al.
patent: 3580057 (1969-06-01), Seegmiller
patent: 3635076 (1972-01-01), Sacks et al.
patent: 3638053 (1972-01-01), Schenk et al.
patent: 3885423 (1975-05-01), Schuermann et al.
patent: 4021688 (1977-05-01), Kudinov et al.

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