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US 5,746,547 AGranted
Mine support cribs
AssigneeStrata Products Ltd.
InventorsJohn Joseph Reinmann, Clifford A. McCartney
Life of this patent
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AssigneeStrata Products Ltd.
InventorsJohn Joseph Reinmann, Clifford A. McCartney
Estimating the term…
The invention is concerned with a mine support crib of the type which comprises a series of superimposed layers of elongate chocks. There is a plurality of parallel, spaced apart chocks in each layer with the chocks in one layer arranged transversely to the chocks in the adjacent layer or layers so that the chocks in a given layer, other than the bottom layer, cross the chocks in the layer below at crossing points which are located inwardly of the ends of the chocks. According to the invention, operatively upper and lower surfaces of the chocks are formed with notches at the crossing points. The notches interlock with one another to lock the chocks together. The notches are of such depth that portions of the chocks which are located between and beyond the notches bear on corresponding portions of chocks in the next layer but one below.
A mine support providing support for the roof of a mine working above the floor thereof, the mine support comprising:
A mine support comprising:
A mine support kit comprising a plurality of elongate chocks, each elongate chock being formed in one piece and having flat operative upper and lower surfaces and, in each of the upper and lower surfaces, at least two notches which are located inwardly of the ends of the elongate chock, each notch of an elongate chock being arranged to interlock in use with a notch of another elongate chock and the depth of each notch being such that portions of the elongate chock which are located between and beyond the notches can bear on corresponding portions of an elongate chock in a layer but one below when said elongate chocks are arranged in layers to form a mine support crib, and a plurality of filler chocks, each filler chock being formed in one piece and having flat operative upper and lower surfaces and, on one of the upper and lower surfaces of the filler chocks, at least two notches which are located inwardly of the ends of the filler chocks, each notch in a filler chock being arranged to interlock in use with a notch of an elongate chock and the depth of the filler chock notches being such that portions of the filler chock which are located between and beyond the filler chock notches can bear on corresponding portions of an elongate chock in a layer second from the bottom or second from the top when the elongate chocks and the filler chocks are assembled to form a mine support crib, said elongate chocks having a length, a width, and a height, said filler chocks having a length, a width, and a height, the length and the width of the filler chocks being substantially equal to the length and the width of the elongate chocks, and the height of the filler chocks being substantially equal to one half of the height of the elongate chocks.
Dependencies are inferred from the claim text.