Patent ID: 8342085
Filing Date: 2013-01-01
Classification: B30B

Abstract:
1. A system for locally increasing pressing pressure in a press tool having a first part with a first abutment surface clamped to a first clamping surface in a press and a second part with a second abutment surface clamped to a second clamping surface in the press, said system comprising: a number of press cylinders for exerting the pressing pressure of the press; the first abutment surface of the press tool being smaller than the first clamping surface in said press; a power unit smaller than said first abutment surface and provided in a contact region between the first clamping surface in the press and the first abutment surface of the tool; said power unit being configured on activation, concurrently with activation of the press cylinders, to press away from the first clamping surface at least a part of the first abutment surface on the tool; said power unit comprising at least two plates defining an interspace between said at least two plates; said at least two plates being circumscribed by and being fastened to a frame member extending along peripheries of the plates; and said power unit being capable of being activated by supplying a pressurized hydraulic fluid into the interspace for causing the power unit to expand thereby locally increasing the pressing pressure on the first tool part.