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:
Apr. 16, 2002
Filed:
Jun. 09, 2000
Masayuki Amano, Osaka, JP;
Tomohiro Hosokawa, Osaka, JP;
Minoru Yoshida, Osaka, JP;
Hidenori Shimizu, Shiga, JP;
Matsushita Electric Works, Ltd., Kadomi, Osaka, JP;
Abstract
An impact-driven rotating device includes an output shaft, a hammer for rotating the output shaft by imparting an impact to the output shaft, a rotation driver for rotating the hammer, an impact detector for detecting the impact imparted by the hammer, a rotation angle detector for detecting a rotation angle of the output shaft, a rotation speed detector for detecting a rotation speed of the output shaft from the rotation angle detected by the rotation angle detector, an energy calculator for calculating energy imparted to the output shaft from the rotation speed detected by the rotation speed detector, a between-impacts rotation angle calculator for calculating a rotation angle of the output shaft rotated from when the impact detector detected the impact to when the impact detector detects an subsequent impact from the rotation angle detected by the rotation angle detector, a tightening torque calculator for calculating a tightening torque by dividing the energy calculated by the energy calculator by the rotation angle calculated by the between-impacts rotation angle calculator, and a controller for stopping the rotation driver when the tightening torque calculated by the tightening torque calculator becomes equal to or exceeds a predetermined torque.