Safety drilling tool
OwnerJames Edwin Funkinventor
Life of this patent
Estimating the term…
Abstract
A safety drilling tool having a tapered drill bit that drills through materials, such as metal, without producing any torque or heat is provided. The safety drilling tool may provide safety for the operator of the tool while drilling or cutting into electrical/electronic enclosures, such as switchgear. The bit may include a smooth graduated cam on the cutting portion eliminate the usage of steps as is the conventional practice in the art. The drill bits may be different sizes to reduce the bulkiness for sake of convenience. The bits may have a one or more internal helical flutes for pushing the debris through the hole being drilled. The hole saw portion of the bit draws the material into the center of the bit until the initial hole is made allowing the debris from the tapered bit to flow through hole being drilled.
Claims19
A drilling tool, comprising:
- an arbor assembly, the arbor assembly comprising:
- an elongated shank extending along a longitudinal shank axis, the elongated shank having a proximal shank end and a distal threaded shank end;
- a pilot bit extending along a longitudinal pilot-bit axis, the pilot bit being partly arranged within the elongated shank and projecting out of the distal shank end;
- and
- a circular plate extending horizontally from the proximal shank end of the elongated shank;
- a graduated cam having a proximal cam end, a distal cam end and an opening extending vertically through the graduated cam for receiving the arbor assembly, the proximal cam end has a circular configuration having a first circumference and the distal cam end has a circular configuration having a second circumference where the first circumference is greater than the second circumference;
- a plurality of internal helical flutes located within the graduated cam and extending helically from the proximal cam end to the distal cam end for receiving debris produced from drilling into a material;
- and
- a hole saw comprising:
- a hollow cylindrical member having a cylindrical wall and a cutting edge, the cylindrical wall threadingly engaged with the distal threaded shank end;
- and
- a plurality of teeth on the cutting edge, the plurality of teeth comprising a plurality of repeating segments, each segment having a tip, a rake face adjacent the tip and a curvilinear base surface located on an opposite side of the rake face relative to the tip and where the curvilinear base surface extends in the cutting direction of the hole saw.
A drilling tool, comprising:
- an arbor assembly, the arbor assembly comprising:
- an elongated shank extending along a longitudinal shank axis, the elongated shank having a proximal shank end, a distal shank end and a hexagonal cross section;
- a pilot bit extending along a longitudinal pilot-bit axis, the pilot bit being partly arranged within the elongated shank and projecting out of the distal shank end;
- and
- a circular plate extending horizontally from the proximal shank end of the elongated shank;
- a graduated cone shaped cam having a proximal cam end, a distal threaded cam end, a smooth outer surface and an opening extending vertically through the graduated cone shaped cam for receiving the arbor assembly, the circular plate on the elongated shank adapted to stop the elongated shank in a proper location in the graduated cone shaped cam;
- a plurality of internal flutes extending helically from the proximal cam end to the threaded cam end for receiving debris produced from drilling into a material;
- and
- a hole saw comprising:
- a hollow cylindrical member having a cylindrical wall and a cutting edge, the cylindrical wall threadingly engaged with the distal threaded shank end;
- and
- a plurality of teeth on the cutting edge, the plurality of teeth comprising a plurality of repeating segments, each segment having a tip, a rake face adjacent the tip and a curvilinear base surface located on an opposite side of the rake face relative to the tip and where the curvilinear base surface extends in the cutting direction of the hole saw.
Dependencies are inferred from the claim text.