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:
Sep. 25, 1990
Filed:
Dec. 14, 1988
Hisanori Toyoshima, Hitachi, JP;
Fumio Jyoraku, Hitachi, JP;
Yoshitaro Ishii, Hitachi, JP;
Kazuo Tahara, Hitachi, JP;
Haruo Koharagi, Ibaraki, JP;
Syuji Watanabe, Ibaraki, JP;
Kouichi Saito, Kitaibaraki, JP;
Kunio Miyashita, Hitachi, JP;
Tunehiro Endo, Hitachiota, JP;
Wakichiro Hishi, Nagareyama, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
In a vacuum cleaner comprising an electric blower and a speed control unit to operate the electric blower at a variable speed, a plurality of kinds of operation control rules of the electric blower are previously stored in the speed control unit, a load current value of the electric blower is continuously detected during the cleaning and the type of the surface to be cleaned is estimated from the load current value. Thereafter, the operation control rule suitable for the estimated cleaning surface is selected from the operation control rules stored in the speed control unit and the electric blower is driven on the basis of the selected operation control rule.