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:
Dec. 03, 2019
Filed:
May. 22, 2015
Hitachi Koki Co., Ltd., Tokyo, JP;
Hideyuki Tanimoto, Ibaraki, JP;
Koki Holdings Co., Ltd., Tokyo, JP;
Abstract
An electric tool is provided with a rotary striking mechanism unit converting the rotational force of a brushless motor to a striking force and applying the striking force to a tip tool. The required rated input of the motor is 1000-1300 W, the motor speed under fixed speed control is 16800±10% (min), and the variable Ku, which relates to the motor, is defined by the following expression Ku={(stator core outer diameter)×(stator core lamination thickness)×(total tooth width)×(rotor outer diameter)}÷{(rated input)×(motor speed under fixed speed control)}, wherein the stator core outer diameter, the stator core lamination thickness, the total tooth width and the rotor outer diameter are shown in mm, the rated input is shown in W, the motor speed is shown in min, and the Ku value of the motor is set to 14.6<=Ku<=21.8.