Mine roof anchor assembly having an expansion shell assembly wit

Details Mine roof anchor assembly having an expansion shell assembly wit Mine roof anchor assembly having an expansion shell assembly wit

1990-05-04

1991-12-31

Corbin, David H.

Hydraulic and earth engineering

Earth treatment or control

Rock or earth bolt or anchor

4052596, E21D 2002

Patent

active

050767330

ABSTRACT:
A mechanical expansion shell assembly has an expansion shell with a plurality of leaves and a plug with a plurality of sloped surfaces. The inner surfaces of the leaves are positioned in overlying relation with the sloped surfaces of the plug. A friction reducing material is positioned between the overlying surfaces and is arranged to reduce the torque applied to the roof bolt connected to the expansion shell assembly to obtain a preselected lateral force on the expansion shell leaves. In another embodiment, a friction reducing material is positioned between a nut threaded on the roof bolt and the underside of the expansion shell ring portion.

REFERENCES:
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patent: 4195952 (1980-04-01), Swanson
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patent: 4490074 (1984-12-01), Chaiko
patent: 4501516 (1985-02-01), Kotulla et al.
patent: 4618291 (1986-10-01), Wright
patent: 4784530 (1988-11-01), Price
"Bethlehem Roof and Rock Bolts", Bethlehem Steel, Catalog 2366-A.
"Bethlehem Mine Roof Bolts and Accessories", Bethlehem Steel Company (15 total pages).

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