The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 17, 2015
Filed:
May. 03, 2012
Erik Vilhelm Persson, Solna, SE;
Ulf Roland Brändström, Bagarmossen, SE;
John Berglind, Tyreso, SE;
Martin Hertsius, Bromma, SE;
Erik Vilhelm Persson, Solna, SE;
Ulf Roland Brändström, Bagarmossen, SE;
John Berglind, Tyreso, SE;
Martin Hertsius, Bromma, SE;
ATLAS COPCO INDUSTRIAL TECHNIQUE AB, Stockholm, SE;
Abstract
A power wrench with a torque sensing unit includes a housing, a motor, an output shaft, and a planetary reduction gearing connecting the motor to the output shaft and including a stationary ring gear supported in the housing, wherein the torque sensing unit includes a torque transferring element with a single radially extending reaction arm arranged to transfer reaction torque from the ring gear to the housing and carrying strain measuring sensors for generating signals in response to the transferred reaction torque. The torque transferring element includes an annular body with two weak portions to be elastically deformed during torque transfer and having flat surfaces for carrying the strain measuring sensors.