Global Patent Index - EP 0974410 A2

EP 0974410 A2 2000-01-26 - Machine with hydraulically controlled counterpressure holding element

Title (en)

Machine with hydraulically controlled counterpressure holding element

Title (de)

Vorrichtung mit druckmittelbetätigten Gegendrückhaltungselement

Title (fr)

Dispositif à contrôle hydraulique pour élément de tenue à contrepression

Publication

EP 0974410 A2 (EN)

Application

EP 99850120 A

Priority

SE 9802566 A

Abstract (en)

The invention relates to a machine with a hydraulically controlled counterpressure element. The machine comprises a frame and top and lower machine parts (1, 2) in a conventional way for performing the embossing. According to the invention the counterpressure element (6, 11) is connected to a hydraulic cylinder (4, 12), said counterpressure element engaging the plate (3). The hydraulic cylinder (4, 12) is connected to a hydraulic circuit having a controllable hydraulic pressure, so that the counterpressure element is pressed back at the controlled pressure during an embossing operation. The counterpressure element may be included in a holding means to hold the plate securely during the embossing. According to the invention a machine part (1) is then connected to a positive counterpressure element (10) and another machine part (2) is connected to a hydraulic cylinder (4), said hydraulic cylinder (4) having a plunger and a stem (5) connected to a gripping means (6) holding the plate (3) together with the positive counterpressure element (10), such that the plunger during an embossing operation is pressed back at a controlled pressure. The holding means provides a secure holding through the whole press operation. The counterpressure element may also be included in an embossing counterpressure element, in which the counterpressure may be set in order to achieve a pre-embossing or a pressure controlled embossing. The invention may be applied to all types of machines in which counterpressure elements are required. <IMAGE>

IPC 1-7 (main, further and additional classification)

B21D 24/14

IPC 8 full level (invention and additional information)

B21D 22/02 (2006.01); B21D 24/14 (2006.01)

CPC (invention and additional information)

B21D 22/02 (2013.01); B21D 24/14 (2013.01)

Designated contracting state (EPC)

AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

DOCDB simple family

EP 0974410 A2 20000126; EP 0974410 A3 20030423; SE 518856 C2 20021126; SE 9802566 D0 19980717; SE 9802566 L 20000118