Roof support suitable for use in mines

Details Roof support suitable for use in mines Roof support suitable for use in mines

1984-07-02

1986-09-02

Husar, Cornelius J.

Hydraulic and earth engineering

Earth treatment or control

Shoring, bracing, or cave-in prevention

405291, E21D 1544, E21D 17054

Patent

active

046093087

ABSTRACT:
A roof support, suitable for use in mines, includes a roof-engageable canopy which comprises a main portion and an extension portion having a pivotal connection to the main portion. Actuator means is carried by the main portion. A wedge member, which is operable by the actuator means, is disposed between, and is engageable with, the main portion and a part of the extension portion projecting substantially beyond the said pivotal connection towards the actuator means. The wedge member is adapted arcuately to be movable by the actuator means and such arcuate movement effects tilting of the extension portion with respect to said main portion.

REFERENCES:
patent: 3534559 (1970-10-01), Seddon et al.
patent: 4447174 (1984-05-01), Becker et al.
patent: 4512686 (1985-04-01), Waters

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