1976-04-12
1977-06-07
Taylor, Dennis L.
E21D 1544
Patent
active
040274896
ABSTRACT:
A mine roof support comprising a roof engaging canopy, a floor-engaging means, a pair of shields pivotally secured to the canopy and extending downwardly and rearwardly in side-by-side relation over the floor-engaging means, a quadrilateral linkage securing each shield to the floor-engaging means and extensible strut means for adjusting the height of the canopy so arranged that the canopy may tilt about a transverse horizontal axis and a fore and aft axis to engage the roof, the shields being capable of providing differing height settings to accommodate canopy tilt about the fore and aft axis.
REFERENCES:
patent: 3921409 (1975-11-01), Blumenthal
Sutton James Anthony
Walker John Hirst
Waters John Henry
Dowty Mining Equipment Limited
Taylor Dennis L.
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