CARL STOVER
Refrigeration Contractor at State Rte 37, Ostrander, OH

6450004, Sep 17, 2002

Oct 9, 2001

09/971658

Douglas E. Edmondson - Kilbourne OH 43032
Carl Stover - Ostrander OH 43061

B21D 3704

724823, 724811, 72462, 724822

A press brake punch holder provides a single actuation assembly to apply symmetrically opposed, lateral forces to a series of otherwise independent punch clamps for securing a corresponding series of punches within the clamps. The clamps are each pivotally secured to the holder assembly by a series of generally centrally disposed bolts therethrough, with the clamps rotating through a limited arc on spherical bearings between the clamps and the holder body. The laterally acting actuator urges the upper ends of the clamps apart, thereby urging their opposite lower ends together to clamp the punches therebetween, or between each clamp and a central structure. Release of lateral pressure allows the punches to be removed as desired, with light spring pressure holding the punches in place when, lateral pressure is removed. Actuation may be provided by a laterally acting wedge assembly, or by laterally acting fluid pressure (hydraulics or pneumatics).