Support column for use in a mine

Details Support column for use in a mine Support column for use in a mine

1994-10-28

1996-01-16

Foss, J. Franklin

Supports

Props and braces

Adjustable length

248357, 405288, A47F 500

Patent

active

054841305

ABSTRACT:
An adjustable column for use between ceiling and floor surfaces of a mine has an outer tube having an outer end and an inner end and an inner tube having an inner end in the outer tube at the inner end thereof and an outer end. The tubes are coaxial to an upright axis and an external screwthread on the outer-tube inner end fits with an inner screwthread on the inner-tube inner end so that the tubes can be screwed relative to each other to change the axial length of the column. One of the outer ends is operatively braced against one of the surfaces and the other outer end is spaced from the other of the surfaces. A resiliently compressible support element is braced axially between the other outer end and the other surface.

REFERENCES:
patent: 568471 (1896-09-01), Ball
patent: 1572856 (1926-02-01), Watson
patent: 2544780 (1951-03-01), Dean
patent: 3737134 (1973-06-01), Foon
patent: 4122645 (1978-10-01), Tooley
patent: 4234151 (1980-11-01), John
patent: 5015125 (1991-05-01), Seegmiller
patent: 5056753 (1991-10-01), Lunau

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