Tensioning device for expanding a threaded bolt

US9981369B2 · kind B2 · utility

Inventors

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

Key dates

• Filing date: May 4, 2015
• Grant date: May 29, 2018
• Expiry date: May 6, 2036

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B23P19/067
• WIPO field: Machine tools
• WIPO sector: Mechanical engineering

Abstract

A tensioning device for stretching a threaded bolt by applying tension to the threaded portion of the threaded bolt has a base and a support tube surrounding the threaded bolt and supported on the base. A cylinder housing is arranged as an axial extension on the support tube. A piston is moveably arranged in the cylinder housing and delimits together with an inner wall of the cylinder housing a hydraulic operating chamber. An interchangeable bush is rotatable relative to the piston and can be entrained axially by the piston. The interchangeable bush has an internal thread to establish a screw connection to the threaded portion. A device for path and/or position detection with first and second interacting elements is provided. The first element is fastened to the at least one piston and faces the cylinder housing. The second element is fastened to the cylinder housing and faces the piston.