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:
Jul. 07, 2009
Filed:
Jan. 21, 2005
Takahiro Doi, Kusatsu, JP;
Hiroyuki Taniwa, Kusatsu, JP;
Takahiro Doi, Kusatsu, JP;
Hiroyuki Taniwa, Kusatsu, JP;
Daikin Industries, Ltd., Osaka, JP;
Abstract
A pistonhas a generally cylindrical-shaped roller and a blade that is integrally formed with the roller. The pistonperforms a swing motion while orbitally revolving within a cylinder chamber of a cylinder. A light-load side portion of an inner circumferential sliding surface of the roller is provided as a small-width portion which is smaller in width than a heavy-load side large-width portion. The small-width portion is formed over a range from a point A resulting from a 30° displacement to a point B resulting from a 180° displacement in a rotational direction of the drive shaft from a base point which is given by a joining point O of the roller with the blade. The pistonorbitally revolves within the horizontal plane, and the small-width portion of the roller serves as an oil sump in such a manner that upper side portion of the inner circumferential sliding surface is cut out.