Hydraulic and earth engineering – Earth treatment or control – Rock or earth bolt or anchor
Patent
1979-12-05
1982-04-20
Taylor, Dennis L.
Hydraulic and earth engineering
Earth treatment or control
Rock or earth bolt or anchor
411371, 411454, E21D 2100, E21D 2000
Patent
active
043256570
ABSTRACT:
A roof support pin for insertion into the strata of the roof including an elongate rod having a non-circular cross-section to provide corners, the rod being twisted so that the corners provide longitudinal substantially helical fins for turning into and gripping the roof strata as the rod is inserted into the roof. A roof support plate is provided with an aperture having a cross-section with corners that engage the corners of the rod cross-section for turning the rod into the roof strata as the rod is moved longitudinally relatively through the aperture. The roof support plate grips the roof and precludes relative turning of the plate and roof as the rod is moved longitudinally through the plate aperture and is twisted into the roof strata. After the rod is inserted into the roof, the roof support plate grips the roof, and precludes relative turning of the plate and rod and precludes untwisting of the rod from the roof strata upon application of a downward longitudinal load force applied axially through the pin by the roof. The roof support pin can be utilized in a roof having a preformed longitudinal hole of smaller cross-sectional dimension than the rod cross-sectional dimension or the rod can form its own longitudinal hole as the rod is turned upon longitudinal movement through the plate aperture incident to insertion of the rod into the roof, the helical fins cutting into the walls of a preformed hole and cutting into the roof strata as the rod forms its own longitudinal hole to provide its own helical grooves, for gripping the roof strata.
REFERENCES:
patent: 1176456 (1916-03-01), Hutter
patent: 1667268 (1928-04-01), Pleister
patent: 3899893 (1975-08-01), Banerjee et al.
patent: 4098087 (1978-07-01), Swain
patent: 4126004 (1978-11-01), Lindeboom
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