Tensioning device for a screw connection, method for tightening a screw connection, and threaded nut

US10322478B2 · kind B2 · utility

Inventors

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

Key dates

• Filing date: Sep 29, 2016
• Grant date: Jun 18, 2019
• Expiry date: Feb 15, 2037

Classification

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

Abstract

A tensioning device for elongating a screw assembly, provided with threaded bolt and threaded nut supported on a fixed substructure, by applying a traction force to a free threaded end of the threaded bolt has a cylinder housing with internal wall and a piston movable in the cylinder housing in longitudinal piston direction. The piston together with the internal wall delimits a hydraulic operating space. A replaceable bush entrained by the piston in the longitudinal piston direction has a thread with which the bush can be screwed to the threaded bolt. A support tube is disposed on the cylinder housing, is supported on the fixed substructure, and surrounds the threaded nut. A lock bar is disposed on the support tube and has a lock-bar face facing the piston. The lock-bar face bears on a blocking face of the threaded nut that faces away from the piston.