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. 19, 2019
Filed:
Dec. 19, 2014
Atlas Copco Industrial Technique Ab, Stockholm, SE;
Erik George Baker, Täby, SE;
Erik Vilhelm Persson, Solna, SE;
Kristoffer Felix Wadman, Stockholm, SE;
ATLAS COPCO INDUSTRIAL TECHNIQUE AB, Stockholm, SE;
Abstract
A power tool for tightening a fastener includes: an angle measurement unit for measuring a rotational angle (α) of the fastener; a torque measurement unit for measuring a torque (T) delivered to the fastener during tightening; a motor connected to rotatable parts of the power tool for driving the tightening of the fastener; a processor for calculating a tightening energy (E) needed to complete tightening of the fastener from α to a predetermined target angle (α), wherein Eis calculated based on α, αand a stiffness (k) of a joint; and a regulator to regulate a rotational speed (ω) of the motor to provide rotational energy (E) in the form of rotational inertia in the rotatable parts of the power tool to meet the needed E, wherein the power tool interrupts the tightening of the fastener at α, αdefined from snug, at a snug angle (α).