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:
Jan. 29, 2002
Filed:
Sep. 22, 2000
Kazuyuki Okubo, Nagano, JP;
Daiki Tanemura, Nagano, JP;
Nissei Plastic Industrial Co., Ltd., Nagano-Ken, JP;
Abstract
Disclosed is a hydraulic drive system of an injection molding machine which has a hydraulic power source equipped with a fixed-displacement hydraulic pump and a servomotor for driving the hydraulic pump and functioning to control discharge rate and discharge pressure of the hydraulic pump through control of the rotational speed of the servomotor. In the hydraulic drive system, a pilot port of a control valve connected to a hydraulic actuator of the injection molding machine is connected to a supply line of working fluid discharged from the hydraulic power source, via a series circuit including a check valve for preventing backflow from the pilot port and a changeover valve.