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:
Jul. 05, 2016
Filed:
Dec. 01, 2011
Applicants:
Kenya Yanagihara, Anjo, JP;
Yoshitaka Ichikawa, Anjo, JP;
Motohiro Omura, Anjo, JP;
Inventors:
Assignee:
MAKITA CORPORATION, Anjo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B23D 47/12 (2006.01); H02P 6/00 (2016.01); H02H 7/08 (2006.01);
U.S. Cl.
CPC ...
B23D 47/12 (2013.01); H02P 6/002 (2013.01); H02P 6/005 (2013.01); H02H 7/08 (2013.01);
Abstract
A cordless electric power tool comprises a motor that drives a tool, a battery that supply electric power to the motor and a motor drive circuit that is disposed between the motor and the battery. The motor is a three-phase brushless motor, and the battery has a nominal voltage of 18 volts. An overall electric efficiency of the cordless electric power tool becomes at least 70 percent when a value of current passing through the motor becomes at least 35 amperes but no more than 45 amperes and the cordless electric power tool outputs power of at least 450 watts but no more than 550 watts.