Shield-carrying roof support unit

Details Shield-carrying roof support unit Shield-carrying roof support unit

1978-11-08

1980-04-08

Taylor, Dennis L.

Hydraulic and earth engineering

Earth treatment or control

Shoring, bracing, or cave-in prevention

E21D 1544

Patent

active

041970357

ABSTRACT:
It is an object of the invention to provide an improved shield-carrying roof support unit which has a linkage for adjusting the elevation of the cap while the pivotal connection between the cap and the shield is constrained to move substantially at right angles to the base frame. The provision of auxiliary links having pivotal connections at properly selected points results in a linkage which has a precisely defined configuration and avoids an overloading of the pivotal connections such as could occur in known shield-carrying roof support units of the same kind.

REFERENCES:
patent: 3915500 (1975-10-01), Schlusener et al.
patent: 4020640 (1977-05-01), Sigott et al.
patent: 4056941 (1977-11-01), Watermann
patent: 4077223 (1978-03-01), Koppers et al.

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