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:
Oct. 11, 2005
Filed:
Aug. 02, 2004
Ryusuke Muto, Yokohama, JP;
Ryusuke Muto, Yokohama, JP;
Anest Iwata Corporation, , JP;
Abstract
A scroll vacuum pump has an orbiting scroll and fixed scrolls. The orbiting scroll is rotatably mounted to an eccentric portion of a driving shaft and revolved by the driving shaft, so that a gas is sucked into a compression chamber between the orbiting scroll and fixed scrolls through a sucking bore. External air is introduced through a ventilating hole axially formed in the driving shaft and into the compression chamber via a check valve that opens by centrifugal force when the driving shaft rotates, thereby cooling the eccentric portion and bearings to increase durability thereof. When the driving shaft stops, the check valve closes, so that a toxic gas in the compression chamber is not leaked to the outside to prevent environment pollution.