Tensioning device for extending a threaded bolt, and tool suitable for this purpose, preferably drive adapter

US9381632B2 · kind B2 · utility

Inventors

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

Key dates

• Filing date: Sep 18, 2013
• Grant date: Jul 5, 2016
• Expiry date: Apr 17, 2034

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B25B23/0064
• WIPO field: Machine tools
• WIPO sector: Mechanical engineering

Abstract

A tensioning device for threaded bolts has a supporting tube and a cylinder with a hydraulic supply connected thereto. The supporting tube surrounds the threaded end section of the bolt. A piston is moveable in the cylinder longitudinally. An exchange socket is connected to the piston and driven axially by it. The exchange socket has a first end with internal thread to be screwed onto the threaded end section and a second end with an external polygon member. A tool attachable to the external polygon member enables turning of the exchange socket. The tool has a cup-shaped section having a first open end and an inner side with tool faces that engage the external polygon member. The tool has a drive section that is slimmer than the cup-shaped section and connected to a second end of the cup-shaped section. The drive section extends away from the cup-shaped section.