Rock bolting

Details Rock bolting Rock bolting

1992-04-21

1994-10-04

Corbin, David H.

Hydraulic and earth engineering

Earth treatment or control

Rock or earth bolt or anchor

4052596, 411 3, 411 8, E21D 2102, F16B 3100

Patent

active

053520653

ABSTRACT:
A drive nut (3,7) for a rock bolt, incorporating a nut (7) with a crimped protrusion (9), and an insert (3). The protrusion is crimped to form a plurality of lips (8) adapted to retain insert (3) in the head of the nut (7), the crimping being effected by a pressing tool having a number of preferably square bars. By this crimping technique, the drive nut (3,7) can be fabricated in such a way that the breaking torque required to expel the insert (3) from the nut (7) can be limited to a predetermined range.

REFERENCES:
patent: 3460428 (1969-08-01), Charles
patent: 3979918 (1976-09-01), Vidler
patent: 4122681 (1978-10-01), Vass et al.
patent: 4295761 (1981-10-01), Hansen
patent: 4347020 (1992-08-01), White
patent: 4611954 (1986-09-01), Cassidy
patent: 4618291 (1986-10-01), Wright
patent: 4662795 (1987-05-01), Clark
patent: 5064312 (1991-11-01), Calandra et al.

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