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, 1977
Filed:
Aug. 28, 1973
Applicant:
Inventors:
Toshio Akiyoshi, Kukuoka, JA;
Hakushi Shibuya, Kukuoka, JA;
Assignee:
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JA;
Primary Examiner:
Int. Cl.
CPC ...
F16D / ;
U.S. Cl.
CPC ...
307126 ; 81 5711 ; 1921 / ;
Abstract
A clamping tool is provided with an electric motor as a driving source of the tool. The condition of the axial force of the clamping means, such as a bolt and nut, on the clamped elements, such as metal sheets is detected by monitoring one of the following quantities of the motor or motor circuit: current, voltage, numbers of rotation, and electric power of said electric motor. When the differential coefficient of the measured quantity reaches approximately zero, after the transient starting conditions have subsided, the motor is stopped. This occurs substantially at the yielding point of the clamping means.