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:
Mar. 17, 1992
Filed:
Mar. 08, 1990
Masahiro Iio, Saitama, JP;
Diesel Kiki Co., Ltd., Tokyo, JP;
Abstract
A vane compressor includes a cylinder having a pair of side blocks. A communication passage is formed through at least one of the side blocks. The communication passage has one end thereof opening into a discharge pressure chamber, and another end thereof opening in a rotor side end face of the at least one of the side blocks at a location corresponding to the orbital path of an end of a back pressure chamber defined in each of vane slits having a vane slidably fitted therein. The communication passage is provided therein with a valve which opens the communication passage when the difference between pressure in the discharge pressure chamber and pressure in the back pressure chamber is below a predetermined value, and closes same when the difference in pressure is above the predetermined valve.