Hydraulic prop

US4572480A · kind A · utility

Assignee

• Rochumer Eisenhuette Heintzmann GmbH & Co. KG · DE

Inventors

• Peter Heintzmann · Bochum, DE
• Manfred Koppers · Sörup, DE
• Friedel Amling · Buer, DE
• Karlheinz Bohnes · Bochum, DE

Key dates

• Filing date: Oct 31, 1983
• Grant date: Feb 25, 1986
• Expiry date: Oct 31, 2003

Classification

• Technology area (CPC E): Fixed Constructions
• CPC primary: E21D15/44
• WIPO field: Civil engineering
• WIPO sector: Other fields

Abstract

An hydraulic prop utilized for barricades in blasting operations that affords simplified mounting and dismantling and will have minimal functional inefficiency if deformed by the impact of rocks; and it can be made out of unworked pipe of minimal standards. Two specific guide regions disposed on the piston are spaced large enough from each other that comparatively wide tolerances can be achieved between the piston and the cylinder.