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. 13, 2011
Filed:
Sep. 19, 2008
Kazutaka Iwata, Hitachinaka, JP;
Shinji Watanabe, Hitachinaka, JP;
Nobuhiro Takano, Hitachinaka, JP;
Kazutaka Iwata, Hitachinaka, JP;
Shinji Watanabe, Hitachinaka, JP;
Nobuhiro Takano, Hitachinaka, JP;
Hitachi Koki Co., Ltd., Tokyo, JP;
Abstract
An impact tool () includes a spindle (), a motor (), a rotational impact system (), a current detecting unit (), and a current control unit (). The spindle extends in an axial direction thereof. The motor provides the spindle with a rotational power in accordance with a motor current flowing therethrough. The rotational power rotates the spindle about the axis at an rpm value. The rotational impact system provides the spindle with an impact force in the axial direction, thereby transmitting both the rotational power and the impact force to an end bit. The current detecting unit detects a current value of the motor current. The current control unit reduces the current value if the current value detected by the current detecting unit exceeds a predetermined value.