Patent · US Active

Method and device for tightening screw joints

US11529718B2 · kind B2 · utility

0Cited by

10References

17Claims

0Family size

Assignee

Liebherr-Components Biberach GmbH · DE

Inventors

Jan Parlow · Dietershausen, DE
Ilaka Mupende · Neu-Ulm, DE
Peter Barton · Bretten, DE

Key dates

Filing date	Mar 13, 2018
Grant date	Dec 20, 2022
Priority date	—
Expiry date	Aug 17, 2039

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB25B23/147
WIPO fieldMachine tools
WIPO sectorMechanical engineering

Abstract

A method and apparatus for tightening a screw connection having a motor-operated screwdriver unit, wherein the angle of rotation and the torque are determined during the tightening to be able to stop the tightening process on reaching a desired tightening tension. An increase in the torque over the angle of rotation is determined by a determination device in a first tightening region and a change in the increase in the torque over the angle of rotation is determined in a second, following tightening region, with the screwdriver unit being stopped by a control device on reaching or exceeding of a maximum permitted change in the increase and/or of a change speed that is determined with reference to the increase that occurred in the first tightening region.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.