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:
Jun. 14, 2011
Filed:
Sep. 16, 2005
John Robert Christian Friberg, Nacka, SE;
Mats Cornelius Holmin, Saltsjöbaden, SE;
Knut Christian Schoeps, Tyresö, SE;
Torbjörn Rafael Sjöblom, Årsta, SE;
Nils Gustav Erland Karlberg, Sundbyberg, SE;
Christa Maria Karlberg, Legal Representative, Sundbyberg, SE;
John Robert Christian Friberg, Nacka, SE;
Mats Cornelius Holmin, Saltsjöbaden, SE;
Knut Christian Schoeps, Tyresö, SE;
Torbjörn Rafael Sjöblom, Årsta, SE;
Nils Gustav Erland Karlberg, Sundbyberg, SE;
Christa Maria Karlberg, legal representative, Sundbyberg, SE;
Atlas Copco Tools AB, Nacka, SE;
Abstract
A number of pre-production calibration tightenings are performed at a screw joint identical to a screw joint used in production and using the same impulse wrench as to be used in production tightening. The value of one or more tightening related parameters are registered at the attainment of the desired pre-tension level, and those parameter values are used to statistically form a basis for a reference set-up. The tightening parameter values registered during production tightening are compared to the reference set-up, and an indication is obtained as to discrepancies between the reference set-up and the actually registered parameter values to get an indication as to whether the impulse wrench is malfunctioning and/or the screw joint is faulty.