Mine roof supports

Details Mine roof supports Mine roof supports

1975-05-09

1977-01-11

Taylor, Dennis L.

E21D 1544

Patent

active

040020363

ABSTRACT:
A mine roof support of the type having a canopy supported from a base structure by hydraulically extensible legs and a cantilever roof-engaging member pivotally attached to the forward end of the canopy, is provided with a selectively positionable laterally extending cantilever member by means of which the effective roof-engaging surface of the canopy can be extended, the lateral cantilever member being optionally provided with a forwardly projecting cantilever member by means of which the effective width of the roof-engaging member can also be extended.

REFERENCES:
patent: 3115754 (1963-12-01), Joseph
patent: 3523424 (1970-08-01), Allen
patent: 3739586 (1973-06-01), Wehner et al.
patent: 3837170 (1974-09-01), Martinko et al.
patent: 3889475 (1975-06-01), Allen
patent: 3903703 (1975-09-01), Lubojatsky

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