EP 1531039 B1 20070530 - Electro-hydraulic linear actuator for presses
Title (en)
Electro-hydraulic linear actuator for presses
Title (de)
Elektro-hydraulischer Linearantrieb für Pressen
Title (fr)
Actionneur linéaire électro-hydraulique pour presses
Publication
Application
Priority
IT PR20030100 A 20031112
Abstract (en)
[origin: EP1531039A2] The invention deals with the field of presses and, more precisely, deals with a linear actuator that comprises a simple- or double-acting jack with movement of piston or rod (3) obtained by means of an electro-hydraulic system. The rod or piston (3) provides for a scroll (5) in which a nut screw (6) can rotate and is actuated by a reversible electric motor (21); the nut screw provides for an annular groove (16) adapted to normally discharge the hydraulic circuit supplying the jack during the quick descent and rise steps of the rod. The upward movement of the screw, from the tool working start time, makes the oil discharge circuit close and therefore generates the electric plus hydraulic thrust onto rod or piston: Resilient means (15) are provided that counteract the upward movement of the screw. <IMAGE>
IPC 8 full level
B30B 15/16 (2006.01); F15B 11/02 (2006.01); F15B 15/20 (2006.01)
CPC (source: EP)
B30B 15/161 (2013.01); B30B 15/166 (2013.01); F15B 11/022 (2013.01); F15B 15/088 (2013.01)
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LU MC NL PL PT RO SE SI SK TR
DOCDB simple family (publication)
EP 1531039 A2 20050518; EP 1531039 A3 20050817; EP 1531039 B1 20070530; AT E363379 T1 20070615; DE 602004006693 D1 20070712; IT PR20030100 A1 20050513
DOCDB simple family (application)
EP 04026429 A 20041108; AT 04026429 T 20041108; DE 602004006693 T 20041108; IT PR20030100 A 20031112