Patent ID: 7721634
Filing Date: 2010-05-25
Classification: B21D,Y10T

Abstract:
1. A punch tool, comprising: a casing; a plurality of small-diameter punches vertically movable and circularly arranged in the casing; a plurality of large-diameter punches vertically movable and circularly arranged in the casing; a punch driver provided to be vertically movable and relatively rotatable on an upper portion of the casing; a striker provided on the punch driver to be capable of striking the respective punches; and stripper springs corresponding to the respective small-diameter punches, each said small-diameter punch having a respective stripper spring positioned therearound with said small-diameter punch extending through the center of the respective stripper spring; wherein the respective large-diameter punches are arranged between the small-diameter punches, thereby the stripper springs for the small-diameter punches on both sides of the large-diameter punch act as stripper springs for the large-diameter punch; wherein the stripper springs provided corresponding to the respective small-diameter punches act as stripper springs of the large-diameter punch and a medium-diameter punch; wherein a retainer is provided on the small-diameter punch; wherein another retainer is provided on the large-diameter punch; and wherein a seat portion that supports the retainer provided on the large-diameter punch is provided on the retainer provided on the small diameter punch.