Method and member for tightening threaded fasteners, and fixing and tightening device

US8753057B2 · kind B2 · utility

Inventors

• Pierre Gay · Tournon-sur-Rhône, FR
• Rene Hubert · Lichtenfels, DE

Key dates

• Filing date: Apr 24, 2009
• Grant date: Jun 17, 2014
• Expiry date: Apr 21, 2031

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T29/49948
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

This method of tightening a threaded fastener (6) to a predetermined torque comprises steps in which: axial and rotational coupling is begun, by surface shrinking to a tight fit, of the threaded fastener (6) to a tightening member (2) capable of turning the threaded fastener (6) and thereby tightening it, the tightening member (2) and the threaded fastener (6) being able, from an initial coupled configuration between the tightening member and the threaded fastener, to remain rotationally coupled at a rotary drive torque, transmitted by the tightening member to the threaded fastener, that is less than the predetermined tightening torque, and to be rotationally decoupled from each other at a rotary drive torque, transmitted by the tightening member to the threaded fastener, that is equal to the predetermined tightening torque; and from this initial coupled configuration, a rotary movement is applied to the tightening member (2) up to a rotary drive torque, transmitted by the tightening member (2) to the threaded fastener (6), that causes rotational decoupling of the tightening member (2) from the threaded fastener (6).