Borehole anchor

Details Borehole anchor Borehole anchor

1976-03-17

1977-11-01

Britts, Ramon S.

61 45B, 52573, 52698, 85 62, F16B 1304, F16B 3102

Patent

active

040560368

ABSTRACT:
An anchor assembly or rockbolt for mounting in a borehole in a rock comprises an outer element which is secured proximal to the mouth of the borehole and an inner element which is secured well inside the borehole. The inner and outer elements are connected together in such a manner as to allow mutual limited shifting thereof without disconnection only on stressing of one of the elements relative to the other beyond a predetermined limit. To this end the outer element may be provided with a piston-like inner end that is slidable against a friction coating within a tubular inner element. It is also possible to form the inner and outer elements as separable tube sections interconnected by means of a central rod having a pair of pistons each received in a respective one of the sections and slidable therein on a tight friction lining thereof.

REFERENCES:
patent: 1645903 (1927-10-01), Garber
patent: 2615373 (1952-10-01), Pegard
patent: 3298273 (1967-01-01), McKelvey
patent: 3877235 (1975-04-01), Hill

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