Mine roof support
AssigneeDowty Mining Equipment Limited
InventorsJohn Hirst Walker, Alan Peacock
Life of this patent
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Abstract
This invention concerns a mine roof support of the kind comprising a floor beam, a roof engaging canopy and a plurality of extendible struts such as hydraulic jacks supporting the canopy from the floor beam. The invention comprises the provision of a flap pivotally connected along one edge of the canopy such that outward pivotal movement thereof may cause it to engage the canopy of an adjacent support. Hydraulic jack or equivalent means are provided acting between the canopy and the flap to urge the flap outwardly. The flap provides effective sealing of the gap between adjacent canopies in a line of roof supports and also enables each canopy to be positioned accurately between adjacent supports during advancing movement of the support.
Claims23
A mine roof support comprising a floor beam, a canopy having a pair of parallel opposed edges extending in the advancing direction of the support, a plurality of extendible struts acting between the floor beam and the canopy, one or more pivoted flaps extending along one said edge of the canopy whose pivotal axis or axes is or are substantially parallel to the said one edge of the canopy and means for urging the or each flap outwardly from the canopy.
A mine roof support comprising a floor beam, a canopy having a pair of parallel opposed edges extending in the advancing direction of the support, an extendible strut acting between the floor beam and the canopy, one or more pivoted flaps extending along one said edge of the canopy whose pivotal axis or axes is or are substantially parallel to the said one edge of the canopy and means for urging the or each flap outwardly from the canopy.
Dependencies are inferred from the claim text.