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公开(公告)号：US3613365A
公开(公告)日：1971-10-19
申请号：US3613365D
申请日：1970-03-25
Applicant: VERRINA SPA
Inventor： COSTA GIUSEPPE
CPC classification number: B30B15/245 , B21D5/02 , F15B2211/7114
Abstract: THE HYDRAULIC SYSTEM FOR A HYDRAULIC DRIVING DEVICE OF A BENDING PRESS INCLUDES TWO HYDRAULIC CONTROL CYLINDERS WHICH CO-OPERATE WITH THE UPPER JAW TO EFFECT VERTICAL RECIPROCATION OF THE UPPER JAW BETWEEN GUIDES THEREFOR. THE INVENTION PROVIDES FOR THE INCLUSION IN THE HYDRAULIC SYSTEM OF COMPENSATING CYLINDERS ASSOCIATED WITH THE CONTROL CYLINDERS AND HOUSING PISTONS HAVING OPERA-
TIVE SURFACE OF EQUAL AREA AND WHICH BY CO-OPERATION WITH THE CONTROL CYLINDERS PREVENT JAMMING OF THE UPPER JAW IN THE GUIDES DURING RECIPROCATION OF THE UPPER JAW.
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