1976-07-14
1977-05-31
Shapiro, Jacob
61 45D, 61 45B, E21D 1544
Patent
active
040261182
ABSTRACT:
A device for supporting a tunnel roof at progressive work stations in a mine advances in a straight line in step-wise fashion drawing a work vehicle. Linkage mechanisms actuate a quadruple of roof support structures arranged in inner and outer pairs to advance along a straight line of travel in alternating pairs with the advancing pair unloaded and the stationary pair bearing the roof load. The vehicle, attached to the inner pair of support structures, is drawn relative to the outer pair in forward or reverse motion.
REFERENCES:
patent: 3516258 (1970-06-01), Boland
patent: 3811290 (1974-05-01), Swoager
Fraser Donald R.
Sadowsky Gersten
Shapiro Jacob
The United States of America as represented by the Secretary of
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