Tool for enlarging hole
AssigneeEmhart Inc.
InventorGlenn D. Freeman
Life of this patent
Estimating the term…
Abstract
A tool for enlarging the size of an existing bore to a selected enlarged size. The tool has a drill sized to define the enlarged bore, and a guide having a cylindrical body sized so that the guide can be rotated in the existing bore. The guide and drill including cooperating structures for releasably interconnecting the guide and the drill with the guide and drill coaxially aligned whereby, with the guide releasable secured to the drill, the guide can be located within the original hole to guide the cutting action of the drill as it enlarges the original hole.
Claims18
A tool for enlarging the size of an existing bore to a selected enlarged size comprising:
- a spade bit including a bit having, at the from thereof, a central tapered piercing spike and blades on either side of said spike sized to define the enlarged bore,
- a guide having a cylindrical body sized so that the guide can be rotated in the existing bore,
- said guide including a slot for receiving said piercing spike and a portion of the blades on either side of said piercing spike, said slot having inwardly converging walls so that said blade portions will become wedged within said slot when the bit is pushed into the slot, and
- said guide including a cylindrical central sleeve having an axially extending hole selectively sized for receiving and centering said piercing spike,
- whereby the tools can be secured to a power drill and the guide inserted into the original hole to guide the spade bit as it enlarges the hole.
A tool for enlarging the size of an existing bore to a selected enlarged size comprising:
- a drill sized to define the enlarged bore, said drill including a bit and a central threaded screw projecting from said bit,
- a guide having a cylindrical body sized so that the guide can be rotated in the existing bore,
- said guide including a slot adapted to receive blade portions of a spade bit, said slot having inwardly converging walls so that the blade portions will become wedged within said slot when the bit is pushed into the slot, and
- said guide including a central hole for receiving said threaded screw, said central hole being configured so that said threaded screw will become wedged within said hole, when the screw is screwed into the hole, with said guide and said bit in coaxial alignment, and
- whereby the tool can be secured to a power drill and the guide inserted into the original hole to guide the spade bit as it enlarges the hole.
A tool for enlarging the size of an existing bore to a selected enlarged size comprising:
- a guide having a cylindrical body sized so that the guide can be slidingly inserted into the existing bore, a first end, a second end, an axis, a first passage extending axially from said first end toward said second end, and a second passage extending axially from said first end toward said second end;
- and
- a bit sized to define the enlarged bore and selectable from one of a spade bit or a cylindrical bit, said spade bit being disposable in said second passage to couple said guide to said spade bit with the guide and spade bit coaxially aligned, said cylindrical bit being disposable in said first passage to couple said guide to said cylindrical bit with the guide and cylindrical bit coaxially aligned.
A guide adapted for selective use with a first tool or a second tool for enlarging the size of an existing bore to a selected enlarged size, the first tool having a central tapered piercing spike and blades on either side of said spike sized to define the enlarged bore, the second tool having a cylindrical bit and a central threaded screw projecting beyond the bit, said guide comprising:
- a cylindrical body sized so that the guide can be rotated in the existing bore, said body having a first end, a second end, an axis, a first passage extending axially from said first end toward said second end, and a second passage extending axially from said first end toward said second end, said first passage adapted to receive the first tool for coupling with the body, said second passage adapted to receive the second tool for coupling with the body.
Dependencies are inferred from the claim text.