Punching tool
First Claim
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.
1 Assignment
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Accused Products
Abstract
A punching tool has a guided, axially displaceable die plunger, which is fixed against relative rotation, in a guide bushing. In a bore in its front end a punching die is seated. During the punching stroke the punching die rests against a front face of the die plunger and is axially fixed in place by means of one or several snap-in balls each of which is seated in a transverse bore, which snap-in balls are maintained in engagement with an annular groove by means of a resilient ring in the die plunger. The outer diameter of the resilient ring is only slightly less in the engagement position than the inner diameter of the guide bushing and can be resiliently widened for releasing the punching die outside of the guide bushing.
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Citations
24 Claims
- 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.
- 8. A punching tool, having a guide bushing, a die plunger axially displaceable in the guide bushing and being fixed against rotation relative to the guide bushing, the die plunger having a bore in the front end in which a punching die can be axially fixed, the guide bushing having an openable front end through which the punching die can be inserted and removed the punching die provided with an annular 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 die plunger including a further annular groove located in the outer circumferential surface of the die plunger and intersecting the transverse bores, the resilient ring being located within the further annular groove, wherein when the die plunger is within the guide bushing, the resilient ring is forced inwardly by its engagement with the inside wall of the guide bushing with sufficient force to cause the holding elements to engage the annular groove to secure the punching die in the die plunger, and wherein when the lower end of the die plunger is moved out of the guide bushing through the said openable front end, the resilient ring expands to release the holding elements enough to permit removal of the punching die from the die plunger.
Specification