Knockout punch with pilot hole locator

Details Knockout punch with pilot hole locator Knockout punch with pilot hole locator

2005-12-13

2005-12-13

Shoap, Allan N. (Department: 3724)

Cutlery

Perforating or indenting implements

With portion positioned in work aperture

C030S362000, C030S366000, C083S685000, C083S686000, C083S689000

Reexamination Certificate

active

06973729

ABSTRACT:
A knockout punch is provided with a member such that when the punch and the die are drawn together by the draw stud to make a hole in a workpiece, the member on the punch will locate the punch assembly in a pilot hole. In three embodiments of the invention, the member is formed integrally with the punch and extends from the punch proximate to a bore in the punch which is used to connect the punch to the draw stud. In another embodiment of the invention, the member is provided as an insert which is connected to the punch within a counterbore. The punch is also provided with a pair of piercing portions for piercing through the workpiece after the member has centered the punch assembly with the pilot hole and a pair of cutting portions for shearing the workpiece after the piercing portions have pierced the workpiece.

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Five pages from Greenlee Catalog No. 79 issued in Sep. 1979—Timesaving Tools for Electricians, Maintenance Men and Industry.
Ten pages from Greenlee Catalog MA-1024—Nov. 1993—Tools Testers, and Accessories.

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