Hydraulically-operated devices

Details Hydraulically-operated devices Hydraulically-operated devices

1982-07-07

1983-12-27

Taylor, Dennis L.

Hydraulic and earth engineering

Earth treatment or control

Ground stabilization or reinforcement

91170MP, E21D 2316

Patent

active

044228082

ABSTRACT:
An assembly of mine roof supports each of which has a control member and a hydraulically-operated member, e.g. a cantilever. The cantilevers operate one after the other in a predetermined sequence in response to actuation of one of the control members.
Each cantilever is associated with a pressure-operated control valve and two serially-connected control valves which normally prevent operation of a cantilever in response to actuation of a control member unless the next-before cantilever in the series has completed its operation and the control member which caused that next-before cantilever to operate has been actuated.

REFERENCES:
patent: 3202058 (1965-08-01), Bolton et al.
patent: 3216201 (1965-11-01), Kibble et al.
patent: 3228199 (1966-01-01), Potts et al.
patent: 3243964 (1966-04-01), Thomas et al.
patent: 3246576 (1966-04-01), Kibble et al.
patent: 3272084 (1966-09-01), Bolton et al.
patent: 3320001 (1967-05-01), Allen et al.
patent: 3405608 (1968-10-01), Teale
patent: 3589241 (1971-06-01), Bolton
patent: 4109472 (1978-08-01), Harris
patent: 4159671 (1979-07-01), Allen

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