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:
Mar. 22, 2005
Filed:
Apr. 16, 2002
Knut Christian Schoeps, Tyresö, SE;
Knut Christian Schoeps, Tyresö, SE;
Atlas Copco Tools AB, Nacka, SE;
Abstract
A method and a device for determining the torque magnitude transferred to a threaded fastener at each one of a series of torque impulses delivered to the fastener, includes application of repeated torque impulses on the fastener by a power tool having a motor with a rotor and a pulse unit which intermittently couples the motor to an output shaft. The pulse unit includes an inertia drive member which is accelerated by the motor and transfers its kinetic energy to the output shaft at each torque impulse. A rotation detecting device indicates the instantaneous rotation movement of the inertia drive member. At each impulse generation, the inertia drive member is retarded, and the retardation magnitude as a function of time is calculated. The product of the retardation magnitude and the total inertia moment of the drive member and other rotating parts of the tool forming a rigid unit with the inertia drive member reflects the torque magnitude transferred to the fastener at each impulse.