Patent · US Expired

Method for the angle-controlled turning of a part

US7743673B2 · kind B2 · utility

7Cited by

6References

4Claims

0Family size

Assignee

WAGNER VERMÖGENSVERWALTUNGS-GMBH & CO. KG · DE

Inventors

Paul Wagner · Mülheim an der Ruhr, DE
Ulf Sittig · Bad Wurzach, DE
Guenter Andres · Much, DE
Bernd Thelen · Much, DE

Key dates

Filing date	Apr 7, 2005
Grant date	Jun 29, 2010
Priority date	—
Expiry date	Dec 16, 2025

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB25B23/145
WIPO fieldMachine tools
WIPO sectorMechanical engineering

Abstract

A power wrench (10) for turning a screw is supplied by a hydraulic unit (25) that contains a positive displacement pump (26) and supplies a defined rate of flow. The pressure in a hydraulic pressure line (28) is measured by a pressure sensor (32) and provided to a control unit (31). The volume flow of the hydraulic unit (25) is determined in amount per unit of time. The piston stroke per unit of time can be determined due to the fact that the filling volume of the hydraulic cylinder is known. The piston acts upon a lever system that turns the moving part. The turning angle per unit of time can be determined due to the fact that the lever length is known. This makes it possible to dispense with an angle measuring device and to determine the turning angle merely by measuring pressure.

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