Patent ID: 6148493
Filing Date: 2000-11-21
Classification: B21J,Y10T

Abstract:
A Pop Rivet Core Punch comprising:a punch body which includes a hammer striking end, an elongated punch shaft extending from said punch body opposite from said hammer striking end, wherein said elongated punch shaft comprises a core punching end and a shouldered spring mounting portion abutting the punch body, a centering sleeve with a shallow central centering aperture, with an inside diameter about equal to an outside diameter of a pop rivet head, the centering sleeve further comprising a central aperture extending from a central location of a bottom of the shallow central centering aperture and through the centering sleeve and further having a diameter that allows the sleeve to freely slide on the elongated shaft thereby providing a means for slidably mounting the centering sleeve on the elongated shaft so that the elongated shaft extends through the centering sleeve when sleeve is slid down the shaft, the centering sleeve further comprising a spring mounting shoulder with an outside diameter about equal to an inside diameter of a spring further wherein said spring mounting shoulder is positioned on the centering sleeve on an opposite side than the centering aperture, a spring positioned around the elongated shaft and between the centering sleeve spring mounting shoulder and the shouldered spring mounting portion wherein the spring is biased to resist sliding centering sleeve motion along the elongated shaft toward the shouldered spring mounting portion and further when the centering sleeve is placed over a pop rivet head with a core to be removed the core punching end of the elongated shaft moves into a pop rivet center when a user strikes the hammer striking end thereby overcoming a spring biasing force and causing the centering sleeve to move toward the spring shouldered mounting portion thereby causing the core punching end to extend beyond the centering sleeve and into the pop rivet center further thereby displacing a pop rivet core, the shouldered spring mounting portion having a diameter selected such that the shouldered spring mounting portion is tightly received and held within an end of the spring.