Combined rigid profile and stretching roof bolt with expansion e

Details Combined rigid profile and stretching roof bolt with expansion e Combined rigid profile and stretching roof bolt with expansion e

1990-03-12

1991-05-28

Lindsey, Rodney M.

Expanded, threaded, driven, headed, tool-deformed, or locked-thr

Having separate expander means

Made up of plural expansible segments or sections

411 61, F16B 1304

Patent

active

050189190

ABSTRACT:
In rock or roof bolts, in particular combined rigid profile and stretch or strain roof bolts, the bolt bar, except for the bar tip is surrounding by a sheathing tube and the end thereof projecting out of the drillhole mouth is made tensionable with respect to the rock by means of an anchor plate and a screw means. To ensure the immediate loadbearing capability of such a roof or rock bolt, in particular in the filling mortar method, at least one portion (5) of the sheathing tube (3) is provided as expansion element with cutouts (7) distributed into slots (8) and the bolt tip (2) is formed as abutment.

REFERENCES:
patent: 1394925 (1921-10-01), Marshall
patent: 2148977 (1928-02-01), Buck
patent: 2914983 (1959-12-01), Kopf et al.
patent: 3174387 (1965-03-01), Fischer
patent: 4312612 (1982-01-01), Thompson
patent: 4523880 (1985-06-01), Isler
patent: 4657456 (1987-04-01), Anquetin
patent: 4720224 (1988-01-01), Peterken

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