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. 04, 2012
Filed:
Jul. 14, 2009
Etsuo Matsuki, Kadoma, JP;
Masaaki Nishikata, Kadoma, JP;
Tsuyoshi Kusakabe, Hakata-ku, JP;
Tsukasa Hojo, Kadoma, JP;
Ken Yamamoto, Kadoma, JP;
Etsuo Matsuki, Kadoma, JP;
Masaaki Nishikata, Kadoma, JP;
Tsuyoshi Kusakabe, Hakata-ku, JP;
Tsukasa Hojo, Kadoma, JP;
Ken Yamamoto, Kadoma, JP;
Panasonic Corporation, Osaka, JP;
Abstract
A vane pump includes a casing and a rotary unit rotatably held within the casing. The rotary unit includes a base portion with radially outwardly opened slits extending radially with respect to a rotational axis of the rotary unit and vanes slidably fitted in the respective slits. An annular chamber is formed around the base portion within the casing and divided into a plurality of pump chambers by the vanes. Each of the pump chambers has a volume cyclically expanded and contracted during rotation of the rotary unit to discharge the fluid drawn into each of the pump chambers. The casing includes an inlet port through which to draw the fluid into the annular chamber. The inlet port is arranged to face a portion of the annular chamber extending between a middle position and a terminating position of an expanding section in which each of the pump chambers expands.