Tapered hole cutter
AssigneeDeutsch Fastener Corp.
InventorsRobert D. Jackley, Richard T. Perez
Life of this patent
Estimating the term…
Abstract
A blade type rotary cutter for cutting tapered holes in metal workpieces. The cutter blade is elongated and generally flat, being tapered in the "width" direction for applying the taper to the hole, and being tapered in the "thickness" direction so that the cutting edge along the length of the blade will lead the cutting edges proximate the point and thereby minimize point drift. All cutting edges of the blade are provided with a substantial negative rake for chip control, and the chips are blown out of the hole by jet streams of cutting fluid directed along the longitudinal cutting edges of the blade.
Claims25
A tapered hole cutter which comprises:
- an elongated, generally flat cutter blade having front and rear ends, a pair of opposite sides and a pair of opposite edges, said front end of said blade comprising a drill point,
- said edges of said blade comprising a pair of elongated cutting edges,
- said blade being tapered in the width direction between said cutting edges from a relatively wider rear end to a relatively narrower front end, said taper in width being substantially uniform along the length of said blade, and
- said blade being tapered in the thickness direction between said sides from a relatively thicker rear end to a relatively thinner front end.
A tapered hole cutter which comprises:
- an elongated, generally flat cutter blade having front and rear ends, a pair of opposite sides and a pair of opposite edges,
- said front end of said blade comprising a drill point,
- said edges of said blade comprising a pair of elongated cutting edges,
- said blade being tapered in the width direction between said cutting edges from a relatively wider rear end to a relatively narrower front end, and
- said blade being tapered in the thickness direction between said sides from a relatively thicker rear end to a relatively thinner front end, said taper in thickness being substantially uniform along the length of said blade.
A tapered hole cutter which comprises:
- an elongated, generally flat cutter blade having front and rear ends, a pair of opposite sides and a pair of opposite edges,
- said front end of said blade comprising a drill point,
- said edges of said blade comprising a pair of elongated cutting edges, each of said elongated edges having a negative rake angle,
- said blade being tapered in the width direction between said cutting edges from a relatively wider rear end to a relatively narrower front end, and
- said blade being tapered in the thickness direction between said sides from a relatively thicker rear end to a relatively thinner front end.
A tapered hole cutter which comprises:
- an elongated, generally flat cutter blade having front and rear ends, a pair of opposite sides and a pair of opposite edges,
- said front end of said blade comprising a drill point,
- said edges of said blade comprising a pair of elongated cutting edges, each of said edges having a leading bearing surface portion next to the cutting edge thereof, and a trailing relief surface portion next to said bearing surface portion thereof,
- said blade being tapered in the width direction between said cutting edges from a relatively wider rear end to a relatively narrower front end, and
- said blade being tapered in the thickness direction between said sides from a relatively thicker rear end to a relatively thinner front end.
Dependencies are inferred from the claim text.