Resilienty compressible support column for use in a mine

US5564867A · kind A · utility

Assignee

• Bochumer Eisenhütte Heintzmann GmbH & Co. KG · DE

Inventors

• Lothar Domanski · Oberhausen, DE
• Rudi Podjadtke · Herne, DE

Key dates

• Filing date: Oct 28, 1994
• Grant date: Oct 15, 1996
• Expiry date: Oct 28, 2014

Classification

• Technology area (CPC E): Fixed Constructions
• CPC primary: E21D15/325
• WIPO field: Civil engineering
• WIPO sector: Other fields

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.