Hydraulic and earth engineering – Earth treatment or control – Chemical
Patent
1979-12-10
1981-10-20
Taylor, Dennis L.
Hydraulic and earth engineering
Earth treatment or control
Chemical
405259, 411 1, 411 8, E21D 2002
Patent
active
042957613
ABSTRACT:
A resin or grout anchored rock or mine roof nut and anchor assembly including an elongated cylindrical anchor to be inserted in a bore hole in assembled relation with a nut after insertion of a destructible adhesive resin or grout containing cartridge. The anchor includes an elongated threaded rod to be received in threaded portions of the nut and the nut includes a frangible disc normally held by crimped lip portions forming a stop wall to stop rotation of the nut relative to the anchor when the nut and anchor are assembled at a first relative axial position and operative when the anchor is restrained against rotation in the bore hole by setting of the adhesive resin and torque above a selected threshold is applied to the nut to dilate the crimping and expel the disc to accommodate further threaded insertion of the nut onto the anchor.
REFERENCES:
patent: 3357730 (1967-12-01), Siler
patent: 3877235 (1975-04-01), Hill
patent: 3979918 (1976-09-01), Vidler
patent: 4122681 (1978-10-01), Vass et al.
Stratabolt Corporation
Taylor Dennis L.
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