Tensioning device for expanding a threaded bolt

US9623524B2 · kind B2 · utility

Assignee

• ITH GmbH & Co. KG · DE

Inventors

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

Key dates

• Filing date: Jul 4, 2014
• Grant date: Apr 18, 2017
• Expiry date: Apr 9, 2035

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B25B29/02
• WIPO field: Machine tools
• WIPO sector: Mechanical engineering

Abstract

In a tensioning device for expanding a threaded bolt by a pull on its threaded end portion, a supporting tube surrounds the threaded end portion and a nut is screwed onto the threaded end portion. A cylinder is arranged in the prolongation of the supporting tube and has at least one piston movable therein in the longitudinal direction and connectable to a hydraulic supply. An interchangeable bush is screwable to the threaded end portion and is drivable axially by the piston. A gear arrangement for adjusting the nut is provided. Components of the gear arrangement are a driver element engaging externally on the nut and a drive shaft provided with an engagement structure for a drive tool. In this case, the axis of rotation of the drive shaft is arranged at an angle of preferably 90° to the longitudinal mid-axis of the piston.