Clamping device for expanding a threaded bolt

US9744656B2 · kind B2 · utility

Inventors

• Frank Hohmann · Warstein, DE
• Jörg Hohmann · Meschede, DE

Key dates

• Filing date: Dec 12, 2014
• Grant date: Aug 29, 2017
• Expiry date: Nov 23, 2035

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16B31/043
• WIPO field: Machine tools
• WIPO sector: Mechanical engineering

Abstract

A clamping device for expanding a threaded bolt is provided with a support pipe supported against an underlay surrounding the threaded bolt. A cylindrical housing arranged in extension of the support pipe has a piston movable in longitudinal direction and connectable to a hydraulic supply. A changeable bushing is axially carried by the piston and is provided with an inner thread and a radially expanded portion. A resilient arrangement is arranged around the bushing and acts axially on the piston. A lid is secured to the housing. The other support of the resilient arrangement is provided on the lower side of the housing. The lid has a lid base member and a closure lid. The lid base member is provided with an opening closable by the closure lid. The radial extent of the opening is greater than the radial extent of the radially expanded portion of the bushing.