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US 4,047,828 AGranted
Core drill
OwnerJoseph E. Makelyinventor
Life of this patent
Estimating the term…
Abstract
Disclosed is a core drill for cutting cylindrical sections from stone, glass, shell and other hard materials, while simultaneously drilling a centered hole in each cylindrical section. The drill comprises an abrasive tipped hollow cylindrical core drill and a drill bit positioned centrally within the core barrel.
Claims4
A core drill comprising:
- a. a rigid hollow tube;
- 1. having one end terminating in a bonded abrasive aggregate;
- 2. having the other end threaded on the interior to correspond to the external threads on a hollow rotatable member;
- and
- 3. having within its interior intermediate the ends a circular shoulder;
- b. a hollow cylindrical collet shaped at one end to rest upon said shoulder of (a) and having means at the other end to fit within said rotatable member, said collet cooperating with said shoulder to thereby clamp a drill;
- and
- c. a rod-like drill terminating at one end in an abrasive aggregate and positioned at the other end in said collet.
5 more elements
A core drill comprising:
- a. a rigid hollow tube;
- 1. having one end terminating in a bonded abrasive aggregate;
- 2. having the other end threaded on the interior to correspond to the external threads on a hollow rotatable member;
- and
- 3. having within its interior, intermediate the ends, a circular shoulder whose interior edge is bevelled;
- b. a hollow cylindrical collet, having a bulbous end bevelled to an angle corresponding to the bevelled edge of the interior circular shoulder within said rigid hollow tube and positioned upon said shoulder, and having means at the other end to fit within said rotatable member;
- and
- c. a rod-like drill terminating at one end in an abrasive aggregate and positioned at the other end in said collet.
5 more elements
Dependencies are inferred from the claim text.