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:
Aug. 20, 1991
Filed:
Apr. 10, 1989
Hitachi, Ltd., Tokyo, JP;
Abstract
A scroll compressor comprising a stationary scroll member having a stationary spiral wrap extending from a stationary end plate, an orbiting scroll member having an orbiting spiral wrap extending from an orbiting end plate with the wraps of the stationary scroll member and orbiting scroll member engaging with each other to form a fluid compressing chamber. A main shaft rotates on its own axis, with an eccentric drive shaft being provided having an axis spaced from the axis of the main shaft to orbit around the axis of main shaft and so that the eccentric drive shaft drives the orbiting scroll member to orbit around the axis of the stationary scroll member. The eccentric drive shaft is guided on the main shaft so that a distance between the axis of eccentric drive shaft and the axis of main shaft can be changed, and the main shaft drives the eccentric drive shaft to orbit around the axis of the main shaft. A balance is connected to the eccentric drive shaft, with a center of gravity of the balance weight being spaced from the axis of main shaft so that the centrifugal force of the balance weight draws the eccentric drive shaft toward the main shaft. An arrangement is provided for pushing the eccentric drive shaft away from the main shaft.