Hydraulic and earth engineering – Earth treatment or control – Shoring – bracing – or cave-in prevention
Reexamination Certificate
2006-02-07
2006-02-07
Lee, Jong-Suk (James) (Department: 3673)
Hydraulic and earth engineering
Earth treatment or control
Shoring, bracing, or cave-in prevention
C405S259100, C405S259400, C405S302100, C411S005000, C411S054000, C411S134000
Reexamination Certificate
active
06994496
ABSTRACT:
The invention comprises a roof bolt and nut in screw threaded engagement, said bolt comprising a shaft for insertion in a hole drilled in a mine roof and a threaded portion engaged by the nut whereby the bolt may be rotated. The nut is offset with respect to the longitudinal axis of the shaft of the bolt so that when the bolt is rotated by means of the nut, the bolt is caused to describe a circle of greater diameter than its own diameter, the amount of said offset being from about 0.015 to about 0.50 inches. Preferably the offset is from about 0.02 to about 0.25 inches.The nut may be releasably locked in screw threaded engagement with the bolt so that the bolt can be rotated by means of the nut and above a selected torque the nut will break out.
REFERENCES:
patent: 4031936 (1977-06-01), Curtis
patent: 4514111 (1985-04-01), Issakainen
patent: 4557631 (1985-12-01), Donan et al.
patent: 5078547 (1992-01-01), Calandra et al.
patent: 5222835 (1993-06-01), Wright
patent: 3643522 (1988-06-01), None
patent: 03023190 (2003-03-01), None
Lee Jong-Suk (James)
Minova International Limited
Nixon & Vanderhye P.C.
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