Resin anchored rock or mine roof bolt anchor mechanism

Details Resin anchored rock or mine roof bolt anchor mechanism Resin anchored rock or mine roof bolt anchor mechanism

1977-11-07

1979-01-02

Stein, Mervin

Hydraulic and earth engineering

Earth treatment or control

Chemical

85 62, E21D 2102

Patent

active

041320808

ABSTRACT:
A resin anchored rock or mine roof bolt anchor assembly including an elongated cylindrical anchor member to be inserted in a bore hole in assembled relation with a bolt after insertion of a destructible adhesive-resin-containing cartridge. The anchor member has an elongated bore to receive threaded portions of the bolt and includes a threaded entrance throat having distorted thread portions providing controlled interference with the threads of the bolt to induce resistance to rotation of the bolt relative to the anchor member when the bolt and throat threads are assembled at a first relative axial position and operative when the anchor member is restrained against rotation in the bore hole by setting of the adhesive resin and torque above a selected threshold is applied to the bolt to accommodate further threaded insertion of the bolt into the anchor member bore.

REFERENCES:
patent: 3683989 (1972-08-01), Follstaedt
patent: 3877235 (1975-04-01), Hill
patent: 4051683 (1977-10-01), Koval

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