Resilienty compressible support column for use in a mine

Details Resilienty compressible support column for use in a mine Resilienty compressible support column for use in a mine

1994-10-28

1996-10-15

Dang, Hoang C.

Hydraulic and earth engineering

Earth treatment or control

Shoring, bracing, or cave-in prevention

2483543, E21D 1526

Patent

active

055648673

ABSTRACT:
An adjustable support column for use between ceiling and floor surfaces of a mine has an outer tube having an outer end braced against one of the surfaces 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 braced against the other surface. The tubes are coaxial to an upright axis and a wedge ring carried externally on the inner tube is tapered toward the outer tube and engageable in the inner end of the outer tube for resiliently resisting telescoping of the inner tube into the outer tube with a predetermined force and for permitting telescoping of the inner tube into the outer tube when the tubes are pressed axially together with a force greater than the predetermined force. Formations on the inner tube engage the ring for axially displacing the ring along the inner tube and fix the ring on the inner tube at any of a multiplicity of locations therealong.

REFERENCES:
patent: 568471 (1896-09-01), Ball
patent: 2705605 (1955-04-01), Kreissig et al.
patent: 3737134 (1973-06-01), Foon
patent: 4185940 (1980-01-01), Spies
patent: 4249837 (1981-02-01), Spies
patent: 4966345 (1990-10-01), Bersier
patent: 5015125 (1991-05-01), Seegmiller
patent: 5314161 (1944-05-01), Domanski et al.
patent: 5400994 (1995-03-01), Shawwaf et al.

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