Drill bit

Details Drill bit Drill bit

1998-01-22

1999-09-07

Howell, Daniel W.

Cutting by use of rotating axially moving tool

Tool or tool with support

Having inversely angled cutting edge

408223, 408230, B23B 5102

Patent

active

059476591

DESCRIPTION:

BRIEF SUMMARY
CROSS-REFERENCE TO MICROFICHE APPENDIX

This application is not related to any microfiche appendix.


BACKGROUND OF THE INVENTION

Drill bits are well known in the prior art and are used for drilling nearly any material that commonly exists. Drill bits include bits for drilling wood, steel, plastic, concrete, tile, bone, teeth and so forth. The typical drill bit is frequently referred to as a "twist drill" and is formed of an elongated metal generally cylindrical member having a cutting tip at one end and a shank end at the other. A shank end is thinned by which the bit is grasped by a drill or other device for rotating the bit.
The typical drill bit, and particularly the typical twist drill, has spiral flutes on the exterior surface. The most common type of twist drill has two spiral flutes and a cutting tip with two cutting edges. The spiral flutes are typically symmetrical with respect to a cross-section of the longitudinal or rotational axis of the drill bit and the spiral flutes are typically essentially identical to each other. The cutting tip of the typical drill bit has two spiral flutes that has two cutting edges, each cutting edge extending for a length that is approximately the radius of the basic cylindrical configuration of the bit. Therefore, the two cutting surfaces combined provide an area of contact approximately equal to the diameter of the cylindrical area of the bit. This rather long total cutting edge contact means that, in order to achieve a rapid drilling rate, the bit usually is required to be forced into contact with the material being drilled. Further, the relatively large area of contact of the cutting edge or cutting edges of the drill bit tend to create excessive heat in the drilling operation.
The drill bit of the present disclosure is intended to provide a cutting tip having a non-symmetrical cutting surface with cutting edges that are reduced in length compared to that of the typical twist drill so that thereby force applied on the bit during the drilling operation is concentrated in a shorter tip contact length compared to the typical twist drill.


SUMMARY OF THE INVENTION

The subject of this disclosure is an improved drill bit of the type to be utilized in an instrument providing rotational energy. The drill bit is adaptable for drilling in any material in which a drill bit is normally employed, including metal, wood, and plastics. The drill bit described herein is particularly applicable for use in a tool providing a relatively high rotational rate, that is, a high rpm.
The use of drill bits is, of course, well known. However, the drill bit of this invention is different than the standard drill bit commonly available on the market today. The standard drill bit has a drilling tip that is symmetrical. That is, a standard drill bit has two spiral flutes that end at the drilling tip in which the drilling tip is tapered, providing two opposed cutting surfaces. The cutting surfaces meet at the rotational axis of the drill bit to define a point of rotation around which the drilling surface rotates. The present invention is different in that the drilling tip is asymmetrical and employs asymmetrical cutting edges.
A search for prior art relative to the present disclosure uncovered the following United States patents which will be incorporated by reference to provide background information as to drill bits and particularly to drill bits having a symmetrical cuffing faces.


______________________________________ PATENT NO. INVENTOR TT3 ______________________________________ Design 332,492 Rosenberg Bone Drill Bit For Bone Fasteners Design 347,848 Maynard, Jr. Drill Bit 4,345,899 Vlock Dental Twist Drill 4,456,411 Clement Twist Drill 4,813,824 Grunsky Single-Lip Drilling Tool 4,943,236 Linkow et al Asymmetrical Bone Drill ______________________________________


DESCRIPTION OF THE DRAWINGS

FIG. 1 is an elevational view of a bit employing the principles of this disclosure. The bit of FIG. 1 has two concentric spiral flutes terminating in a bit face that

REFERENCES:
patent: 2396335 (1946-07-01), Moller
patent: 2576664 (1951-12-01), Berlien
patent: 4594034 (1986-06-01), Maier
patent: 5046902 (1991-09-01), Zubov
patent: 5380133 (1995-01-01), Schimmer

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