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:
May. 11, 1982
Filed:
Jan. 17, 1980
Yasuhiro Kawabata, Anjo, JP;
Noriyoshi Shibata, Nagoya, JP;
Aisin Seiki Kabushiki Kaisha, Kariya, JP;
Abstract
A diaphragm air pump assembly in pneumatic association with a vacuum source and an atmospheric air source includes therein two vacuum operational chambers and two pump chambers defined by two interconnected diaphragms upon admission of vacuum to one of the vacuum operated chambers and atmospheric air to the other vacuum operated chamber the diaphragms are moved in one direction due to pressure difference thereby compressing and exhausting the air contained in one of the pump chambers as well as opening one of two normally closed valves. The vacuum is thus admitted into the other vacuum operational chamber while atmospheric air is supplied to one vacuum operated chamber, so that the diaphragms are moved in the other direction thereby compressing and exhausting the air contained in the other pump chamber as well as opening the other normally closed valve. A periodical reciprocation of the diaphragms will accomplish the pumping operation.