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:
Sep. 30, 2008
Filed:
Feb. 22, 2006
Tadashi Arimura, Kyoto, JP;
Tadashi Arimura, Kyoto, JP;
Matsushita Electric Works, Ltd., Osaka, JP;
Abstract
In an impact fastening tool, erroneous detection of a strike by a hammer is prevented. The impact fastening tool includes a strike mechanism that transmits a driving force of a motor to an output shaft with an impact force generated by striking an anvil by the hammer, a fastening torque calculator that calculates a fastening torque equivalent to an actual fastening torque generated by the impact forces, a strike detector that detects occurrences of strikes by the hammer, a motor controller that stops the driving of the motor at a time when the fastening torque reaches a predetermined reference value, a current detector that detects current information in an interval of strikes, and a strike judger that judges whether the detection of a strike is real or unreal by using current information. The fastening torque calculator calculates the fastening torque by ignoring the strike judged real by the strike judger.