Hydraulic and earth engineering – Earth treatment or control – Rock or earth bolt or anchor
Patent
1977-06-20
1979-04-03
Stein, Mervin
Hydraulic and earth engineering
Earth treatment or control
Rock or earth bolt or anchor
85 69, E21D 2100
Patent
active
041474589
ABSTRACT:
A roof pin particularly adapted for mine or tunnel roof support in which the strata-gripping assembly has a plurality of locking discs mounted on and carried by one end of an elongate rod, the locking discs being resilient and having a periphery adapted to engage the strata defining the roof pin hole. Spacers are mounted on and carried by the rod end, and are located between and engage each axially adjacent pair of locking discs, the spacers having a periphery located radially inward of the locking disc periphery. A retainer on the rod at opposite ends of the strata-gripping assembly holds the discs and spacers on the rod end. The locking discs have downturned peripheries adapted to engage the roof strata and flex resiliently downwardly and inwardly upon insertion of the pin, and expand upwardly and outwardly upon application of a load force on the pin during roof support. The spacers engage a subjacent locking disc radially inward of the subjacent disc periphery for reinforcing the subjacent disc and permitting the expansion of the disc periphery, and engage a superjacent locking disc radially inward of the superjacent disc periphery for permitting downward flexing of the disc periphery. The spacers include a bearing member that engages the subjacent locking disc, and at least one spacing member that engages the bearing member and the superjacent locking disc, the number of spacing members determining the axial spacing between the locking discs.
REFERENCES:
patent: 977402 (1910-11-01), Rohmer
patent: 2129439 (1938-09-01), Noble
patent: 3896627 (1975-07-01), Brown
Corbin David H.
Stein Mervin
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