Mine support having a linearly moveable and/or pivoting end...

Details Mine support having a linearly moveable and/or pivoting end... Mine support having a linearly moveable and/or pivoting end...

2007-04-02

2011-11-08

Kreck, John (Department: 3672)

Hydraulic and earth engineering

Earth treatment or control

Shoring, bracing, or cave-in prevention

C405S288000, C405S294000, C248S351000

Reexamination Certificate

active

08052352

ABSTRACT:
A mine support yieldable prop includes a threaded shaft rotatably mounted in an end of the prop to move into and out of the prop end to move a bearing plate toward or away from a mine roof, and/or a bearing plate pivotally mounted to the end of the prop to level the prop with uneven mine roofs.

REFERENCES:
patent: 5228810 (1993-07-01), Seegmiller
patent: 5400994 (1995-03-01), Shawwaf et al.
patent: 5413436 (1995-05-01), Merz
patent: 5484130 (1996-01-01), Domanski et al.
patent: 5564867 (1996-10-01), Domanski et al.
patent: 5720581 (1998-02-01), Bacon et al.
patent: 7134810 (2006-11-01), Stankus et al.
patent: 2004/0223815 (2004-11-01), Stankus et al.

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