Chipper-toothed hole saw
OwnerJohn M. Malone, Jr.inventor
Life of this patent
Estimating the term…
Abstract
A hole-cutting device for attachment to a portable electric drill or similar rotating machine. The device has a cylindrical body with a rearward edge and a forward edge; a mounting plate is affixed across the rearward edge, and a series of chipper teeth are affixed about the forward edge. Each chipper tooth has a transverse cutting edge and a second cutting edge in substantial alignment with the wall of the cylinder, but alternate chipper teeth have second cutting edges displaced inwardly and outwardly from the cylindrical member.
Claims11
A hole-cutting apparatus adapted for attachment to a rotary drive machine, comprising:
- a) a hollow cylindrical member having a cylindrical wall, a forward circular edge and a rearward circular edge;
- b) a connecting plate affixed across the diameter of said cylindrical member at the rearward edge thereof;
- c) a plurality of chipper teeth affixed at spaced intervals along said forward circular edge, each of said chipper teeth having a transverse first cutting edge relative to said forward circular edge, a second cutting edge substantially aligned with said cylindrical wall but axially offset therefrom, and a depth gauge member comprising an upstanding tab aligned with said cylindrical wall, the height of said tab being less than the height of said transverse cutting edge.
A hole-cutting apparatus for attachment to a rotary power tool, comprising:
- a) a thin-walled cylindrical member having a predetermined diameter and length, and having a forward and rearward circular edge;
- b) a connecting plate affixed along said rearward edge and extending across a diameter of said rearward circular edge;
- c) a plurality of chipper teeth removably affixed to said cylindrical member in relatively equal spaced-apart relationship, all of said teeth having cutting edges projecting forwardly of said forward circular edge;
- each said chipper teeth comprising a transverse cutting edge of a length exceeding the thickness of said thin-walled cylindrical member, said transverse cutting edge substantially positioned over said forward circular edge;
- each of said chipper teeth further comprising a side cutting edge in spaced position relative to said thin-walled cylindrical member, said plurality of chipper teeth being alternately aligned to provide alternate side cutting edges radially inwardly spaced and outwardly spaced from said thin-walled cylindrical member.
Dependencies are inferred from the claim text.