Hydraulic and earth engineering – Earth treatment or control – Rock or earth bolt or anchor
Patent
1978-05-31
1980-02-05
Corbin, David H.
Hydraulic and earth engineering
Earth treatment or control
Rock or earth bolt or anchor
405261, 206222, E21D 2100
Patent
active
041870409
ABSTRACT:
An expansion type mine roof bolt assembly is shown that is to be installed in a roof bolt hole in a mine roof. The roof bolt has a stem that is fitted on a base plate, and it includes an expansion shell unit that expands when the bolt is tightened. A chemical dispenser assembly is fitted onto the bolt stem. The chemical dispenser assembly includes a base flange unit with an elongated sleeve that is threaded to the bolt stem. A hollow cylindrical chemical container is supported on the base flange unit. An elongated pressure sleeve unit is interposed between the expansion shell unit and the top portion of the chemical container so that when the bolt is tightened the pressure sleeve transmits a rupture force to the bottom portion of the chemical container to cause the contents of the container to be expelled into the roof bolt hole for sealing the base of the roof bolt hole. The base flange unit may include perforations and spike members for piercing the bottom portion of the chemical container. An optional accessory is a protective U washer that may be temporarily interposed between the spike members and the bottom portion of the chemical container to prevent inadvertent rupturing during non-use of the roof bolt assembly.
REFERENCES:
patent: 2952129 (1960-09-01), Dempsey
patent: 3877235 (1975-04-01), Hill
patent: 3940941 (1976-03-01), Libert et al.
patent: 4051681 (1977-10-01), Yaros
Corbin David H.
Waiamea Company, Inc.
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