Patent ID: 7975587
Filing Date: 2011-07-12
Classification: B21D,B26D,B26F,B30B,Y10T

Abstract:
1. A punching tool, having a guided, axially displacable die plunger, which is fixed against relative rotation, in a guide bushing and having a bore in the front end in which a punching die can be axially fixed, the punching die provided with an annular groove, the punching die having a punch die longitudinal groove into which a transverse pin can be inserted, wherein the diameter of the pin matches the width of the punch die longitudinal groove, holding elements located in transverse bores in the die plunger, which holding elements releasably engage the annular groove, wherein during the punching stroke the punching die rests against a front face of the die plunger and can be axially fixed in place by said holding elements which are maintained in engagement with the annular groove by means of a resilient ring, the outer diameter of which resilient ring is less in the engagement position than the inner diameter of the guide bushing and which resilient ring can be widened to a diameter greater than the inner diameter of the guide bushing when the die plunger is removed from the guide bushing.