Adapter to convert electrical box punch dies into self centering punch dies
OwnerBrian Rayinventor
Life of this patent
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Abstract
This invention generally relates to enlarging a hole in a substrate such that the enlarged hole is centered on the existing hole. A knock-out punch and die tool for enlarging a knock-out hole in an electrical box includes a punch; a generally cup shaped die; a threaded central shaft supporting the punch on one end and the die on the other end; a removable centering element placed in a cup portion of the die; and a resilient element, such as a spring, urging the centering element in an axial direction along a length of the shaft outwardly of the cup portion. The centering element and the spring may be provided as a retrofitting kit for converting non-centering punch and die tools into centering punch and die tools.
Claims2
A knock out punch and die tool for enlarging a knock out hole in an electrical box comprising:
- a punch;
- a generally cup shaped die;
- a threaded central shaft supporting the punch on a first end of the shaft and the die on an opposite second end of the shaft;
- a repeatably removable centering element received in a cup portion of the die;
- and
- a resilient element urging the centering element in an axial direction along a length of the shaft outwardly of the cup portion, wherein the centering element comprises:
- a beveled structure that extends radially inwardly toward the shaft in a direction outwardly of the cup portion, a central through opening surrounding the shaft and a counter bore receiving a portion of the resilient element, wherein the counter bore is located within the beveled structure, and wherein the counter bore comprises a tapered portion.
Dependencies are inferred from the claim text.