Rock bolt overload warning device

Details Rock bolt overload warning device Rock bolt overload warning device

1981-10-30

1983-10-18

Byers, Jr., Nile C.

Hydraulic and earth engineering

Earth treatment or control

Rock or earth bolt or anchor

411 8, E21D 2102

Patent

active

044102968

ABSTRACT:
A washer is described which is used in the construction of the support for the roof of a mine. The washer is fabricated such that finger like projections rupture in stages as the tension on bolts and pressure in the strata of the roof of the mine increases beyond structurely safe limits. The rupturing of the washer emits audible warning signals and also provides a visual indication of an unsafe condition.

REFERENCES:
patent: 2943528 (1960-07-01), Curry
patent: 3072093 (1963-01-01), Lanius
patent: 3187621 (1965-06-01), Turner
patent: 3788186 (1974-01-01), Crites
patent: 4092081 (1978-02-01), Curtis
patent: 4112693 (1978-09-01), Collin
patent: 4156236 (1979-05-01), Conkle
patent: 4334803 (1982-06-01), Westlake

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