Point anchor coated mine roof bolt

Details Point anchor coated mine roof bolt Point anchor coated mine roof bolt

2006-07-11

2006-07-11

Lagman, Frederick L. (Department: 3673)

Hydraulic and earth engineering

Earth treatment or control

Rock or earth bolt or anchor

C405S259500, C405S259400, C405S302100

Reexamination Certificate

active

07073982

ABSTRACT:
A resin bonded mine roof bolt having an elongated rod with a drive head at one end and an expansion anchor threaded onto the other end. A segmented resin compression layer covers a portion of the rod below the expansion anchor. When installed in a mine roof bore hole with curable resin, the resin compression layer mixes the resin and partially fills the bore hole to minimize the amount of resin needed to anchor the bolt. Individual segments of the layer are tapered to create a wedging force on resin with the bore hole. The expansion anchor is expandable upon initial hardening of the resin to tension the bolt.

REFERENCES:
patent: 3805533 (1974-04-01), Askey et al.
patent: 4419805 (1983-12-01), Calandra, Jr.
patent: 4865489 (1989-09-01), Stankus et al.
patent: 5064311 (1991-11-01), Giroux et al.
patent: 5064312 (1991-11-01), Calandra et al.
patent: 5152649 (1992-10-01), Popp
patent: 5584608 (1996-12-01), Gillespie
patent: 5624212 (1997-04-01), Gillespie
patent: 2005/0134104 (2005-06-01), Simmons et al.

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