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. 28, 2006
Filed:
Jul. 29, 2004
Yoshio Iimura, Ibaraki, JP;
Hiroaki Orikasa, Ibaraki, JP;
Mitsuhiro Sunaoshi, Ibaraki, JP;
Kazuhiro Segawa, Ibaraki, JP;
Yoshio Iimura, Ibaraki, JP;
Hiroaki Orikasa, Ibaraki, JP;
Mitsuhiro Sunaoshi, Ibaraki, JP;
Kazuhiro Segawa, Ibaraki, JP;
Hitachi Koki Co., Ltd., Tokyo, JP;
Abstract
An air compressor includes a tank unit storing a compressed air used by a pneumatic tool, a compressed air generator which generates the compressed air and supplies the compressed air to the tank unit, a motor driving the compressed air generator, a drive portion including the motor, a controller portion controlling the drive portion and a pressure sensor detecting an air pressure of the compressed air in the tank unit, in which the controller portion controls a rotation speed of the motor at multiple levels based on a detection signal Pof the pressure sensor, a first differential signal which is a differential value d(P)/dt of the detection signal P, and a second differential signal which is a differential value d(P)/dt of a detection signal Pobtained by removing a pulsatory element from the detection signal P