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:
Feb. 18, 1997
Filed:
Sep. 20, 1995
Hirotsugu Sakata, Kanagawa-ken, JP;
Masayuki Okuda, Kanagawa-ken, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
A fluid machine for transferring working fluid has fixed and rotating spiral members. The fixed spiral member has a stepped internal engagement surface that spirally rises upwardly and inwardly toward its center. The rotating spiral member revolves relative to the fixed spiral member and also has a stepped outer engagement surface that spirally rises upwardly inwardly toward its center. The stepped internal engagement surface of the fixed spiral member engages the stepped outer engagement surface of the rotating spiral member, which together form a compression mechanism. A working space is formed between the engagement surfaces of the spiral members. The capacity of the working space gradually decreases toward the center from the largest to the smallest circumference. A seal member is positioned between the stepped surfaces of the spiral members to seal the working space.