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:
Feb. 04, 2020
Filed:
May. 30, 2014
Hitachi Koki Co., Ltd., Tokyo, JP;
Kenichi Matsunaga, Hitachinaka, JP;
Yoshikazu Kawano, Hitachinaka, JP;
KOKI HOLDINGS CO., LTD., Tokyo, JP;
Abstract
An object of the present invention is to provide an electric power tool capable of automatically changing the rotating speed of an electric motor in accordance with operation conditions. The electric power toolwhich carries out an operation of polishing, peel-off, cutting, or the like by swinging a tip toolattached to a tool retainingpart within the range of predetermined angles by the drive power of the electric motor, wherein the electric power tool has a control device configured to indirectly detect the load of the tip tool from a current value, and to control the rotating speed of the electric motorto a maximum rotating speed and a minimum rotating speed on the basis of the load of the tip tool