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. 10, 1985
Filed:
Jun. 18, 1984
Akira Murayama, Shimizu, JP;
Hiroaki Kuno, Shimizu, JP;
Naoshi Uchikawa, Shimizu, JP;
Takahiro Tamura, Shimizu, JP;
Takao Mizuno, Shimizu, JP;
Sumihisa Kotani, Ibaraki, JP;
Yoshikatsu Tomita, Shizuoka, JP;
Tetsuya Arata, Shimizu, JP;
Masao Shiibayashi, Shimizu, JP;
Kazutaka Suefuji, Shimizu, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A scroll-type fluid machine having an orbiting scroll member and a stationary scroll member each having an end plate and a spiral wrap of at least two turns protruding upright from one of the sides of the end plates. The orbiting scroll member has a back pressure chamber formed on the back side thereof and communicating with the compression spaces of the fluid machine through pressure equalizing ports formed in the orbiting scroll member, so that the pressure of the fluid under compression is introduced to the back pressure chamber to produce an axial thrusting force for pressing the orbiting scroll member towards the stationary scroll member. The positions of the pressure equalizing ports in terms of the wrap angle .lambda. of the wraps are selected to meet the following condition: