Patent ID: 8024952
Filing Date: 2011-09-27
Classification: B21J

Abstract:
1. In a multi-station forging machine having a stationary die breast and a reciprocating slide moveable in a direction towards and away from the die breast, the slide carrying a tool holder at a workstation, a tool case moveable back and forth on the tool holder in the direction of slide movement, tool segments carried in the tool case and moveable between open and closed positions along respective paths formed by a tapered bore in the tool case, the tapered bore being larger adjacent a front of the tool case and decreasing in size in a direction from the front face, a pivotal lever carried on the slide having one portion engaging a rearwardly facing surface adjacent a rear of the tool case, a pivot surface around which said lever pivots, and another portion on a part of the lever extending from the pivot surface remote from the one portion, a high force spring mounted on the die breast, the spring being arranged to apply a high biasing force to said other lever portion when the slide is near or at front dead center and arranged to avoid applying said high force on said other lever portion when said slide is spaced from said front dead center and adjacent positions, said lever transferring said biasing force to said tool case to bias said tool case forwardly.