US 5,293,972 AGranted

Hydraulically operated press brake

AssigneeM & S Brugg AG

InventorWaldemar Krumholz

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Abstract

The invention provides a hydraulically operated press brake with a vertically displaceable upper pressure ram member. The pressing force is induced in the region of the two lateral ends thereof. A cooperating stationary ram member is arranged opposite to the movable ram member and is freely suspended in the region of its two lateral ends. The upper movable ram member is subdivided into two portions, whereby the two portions rest on each other at a centrally located contact area. From this contact area, two gaps extend approximately horizontally, both having increasing width from the contact area to the lateral ends of the ram member. The pressing power is induced into the upper ram member portion. Thus, it can be achieved that the upper ram member and the lower ram member are deflected in the same sense under load such that the deflection lines run essentially parallel to each other.

Claims17

Dependent claims

A hydraulically operated press brake comprising:

a frame structure;
a pressure ram member mounted in said frame structure to be vertically movable;
a stationary ram member mounted in said frame structure;
said pressure ram member being divided into a first upper portion and a second lower portion along a plane essentially running perpendicular to the direction of motion of said pressure ram member;
both said upper portion and said lower portion of said pressure ram member comprising a centrally located contact area where they abut against each other, said upper portion and said lower portion being separated from each other by a gap running on each side from said contact area to lateral ends of said upper and lower portions of said pressure ram member with a continuously increasing gap width;
and
at least two operating cylinders mounted in said frame structure and operatively connected to said upper portion of said pressure ram member in the region of the two lateral ends thereof for driving said pressure ram member to a motion against said stationary ram member and for retracting said pressure ram member vertically back from said stationary ram member.

4 more elements

Dependencies are inferred from the claim text.