E - Fixed Constructions – 21 – D
Patent
E - Fixed Constructions
21
D
61/47
E21D 20/02 (2006.01)
Patent
CA 1187709
APPLICATION OF: CARL A. CLARK and JOHN ROGALA FOR: MINE ROOF ANCHOR ELEMENT AND METHOD OF FABRICATION ABSTRACT OF THE DISCLOSURE A nut element having a frangible portion for use with an elongated bar having an upper end anchored by a resin material within a drill hole in a mine roof, or the like, and a lower end extending outside the hole and threaded to receive the nut element of the invention. The nut includes a portion spaced from the threaded opening which limits relative rotation of the nut and bar. Thus, rotation of the nut with the lower end of the bar contacting the rotation-limiting portion thereof serves to rotate the bar within the drill hole, causing the upper end of the bar to rupture a conventional two-compartment resin cartridge and mix the contents thereof. When the resin has hardened to hold the bar stationary, excess torque applied to the nut serves to break the rotation-limiting portion thereof, preferably a dome-shaped cap with an opening of smaller dia- meter than the threaded end of the bar, allowing the nut to be snugly secured against a roof support plate and tension the resin-anchored bar.
416084
Clark Carl A.
Rogala John
Eastern Company (the)
Macrae & Co.
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