Roof bolt assembly having a sealing plug for preventing a deteri

Details Roof bolt assembly having a sealing plug for preventing a deteri Roof bolt assembly having a sealing plug for preventing a deteri

1986-04-22

1987-09-15

Scanlan, Jr., Richard J.

Hydraulic and earth engineering

Earth treatment or control

Rock or earth bolt or anchor

285110, E21D 2100

Patent

active

046936386

ABSTRACT:
A roof bolt assembly for a mine roof of the mechanical point anchor type is provided with a sealing plug to preclude the flow of mine air into the roof hole surrounding the bolt. In one embodiment, the sealing plug is frusto-conically shaped with an axial bore which surrounds the bolt rod. In another embodiment, the sealing plug is cylindrical with a first set of resilient rings on the external surface for engaging the roof hole sidewalls and with a second set of resilient rings in an axial bore for engaging the bolt rod. The sealing plug is installed in the entrance of the roof hole out of contact with components of the assembly tensioning mechanism.

REFERENCES:
patent: 2829502 (1958-05-01), Dempsey
patent: 3326004 (1967-06-01), Williams
patent: 3430449 (1969-03-01), Novotney et al.
patent: 3913928 (1975-10-01), Yamaguchi
patent: 4140428 (1979-02-01), McLain et al.
patent: 4293138 (1981-10-01), Swantee
patent: 4410296 (1983-10-01), Unrug
patent: 4498817 (1985-02-01), Oulsnan
patent: 4501515 (1985-02-01), Scott

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