Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
May 20, 2008
Patent Application Number
11260376
Date Filed
October 28, 2005
Patent Primary Examiner
Patent abstract
A die drive unit has a cylinder mechanism which hydraulically drives a piston member and an additional drive mechanism which drives the piston member by means of a drive source other than a hydraulic one. A first oil chamber is formed on one side of the piston member. A second oil chamber and a third oil chamber are formed on the other side of the piston member. The first oil chamber and the second oil chamber are connected to each other by an oil passage. The piston pressure receiving area of the first oil chamber is equal to the sum of those of the second and third oil chambers.
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