Patent ID: 6874346
Filing Date: 2005-04-05
Classification: B21D

Abstract:
1. An apparatus used in press brakes having a lower press member and an upper press member which are movable relative toward and away from each other for forming bending and forming sheet materials, said lower press member comprising: a die base formed of a generally U-shaped configuration and having a first recess and a second recess disposed opposite to said first recess; first and second mobile carrier shoes being disposed in a corresponding one of said opposed first and second recesses; a plurality of first and second movable spacer bars being also disposed in a corresponding one of said opposed first and second recesses; a pair of anvils each one being disposed in a corresponding one of said first and second mobile carrier shoes; each one of said pair of anvils being formed of a rectangular shape and having four corners each provided with a separate and distinct radius of curvature so as to define four alternative forming surfaces; each one of said anvils being initially positioned so that a first one of the four corners having the same radius of curvature are on top and facing inwardly toward the other corresponding to a first one of the four alternative forming surfaces and forming a first die-size opening therebetween used for bending and forming a material of a predetermined gauge; and each one of said anvils being selectively rotatable to second through fourth positions so that second through fourth ones of the four corners having the same radius of curvatures are on top and facing inwardly toward the other corresponding to second through fourth ones of the four alternative forming surfaces and forming second through fourth die-size openings therebetween used for bending and forming a material of different predetermined gauges.