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. 12, 1989
Filed:
May. 17, 1988
Kiyoharu Murakami, Neyagawa, JP;
Kabushiki Kaisha Daikin Seisakusho, Osaka, JP;
Abstract
In an air rotary joint supplying compressed air from an outside source through a rotating shaft to a pneumatic equipment; a sealing device for the air rotary joint, in which lubricating oil chambers partitioned by air seals are formed on both sides of an air inlet port, an inlet piping is connected to one lubricating oil chamber, a check valve for checking a counter flow of lubricating oil is installed in the inlet piping, an outlet piping is connected to the other lubricating oil chamber, and a relief valve for maintaining a hydraulic pressure in the lubricating oil chamber below a specified maximum value is installed in the outlet piping so as to prevent air leakage due to counter flow of compressed air into the lubricating oil chamber.