Hydraulic and earth engineering – Earth treatment or control – Chemical
Patent
1977-09-16
1978-10-31
Taylor, Dennis L.
Hydraulic and earth engineering
Earth treatment or control
Chemical
85 63, 151 21B, E21D 2102
Patent
active
041226810
ABSTRACT:
A support assembly for a mine roof, or the like, including a bolt carrying a support plate for engagement with the roof surface, an internally threaded cylindrical collar, and an elongated bar. The bar and bolt are threaded into opposite ends of the collar, the bar being threaded to a fixed stop and the bolt being threaded to a deformation at an intermediate point along the length of the collar threads. A conventional resin package is inserted in the bore hole and the assembly inserted behind it with the end of the bar contacting the package to effect rupturing thereof and mixing of the contents. Rotation of the bolt is transmitted through the collar to the bar as the resin components are mixed due to engagement of the bolt with the deformation in the collar threads. After the resin has hardened the bar and collar cannot be further rotated. By application of a torque to the bolt head which exceeds the resistance provided by the thread deformation, the bolt may be advanced to the extent required to hold the support plate tightly against the roof.
REFERENCES:
patent: 3507313 (1970-04-01), Stockslager
patent: 3674075 (1972-07-01), Hoegee
patent: 3747656 (1973-07-01), Mortus
patent: 3940941 (1976-03-01), Libert et al.
patent: 3967455 (1976-07-01), Conway
patent: 4051683 (1977-10-01), Koval
Speidel Gerald M.
Vass George S.
McGuire Charles S.
Taylor Dennis L.
The Eastern Company
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