Cutting by use of rotating axially moving tool – Processes – Bit detachable
Reexamination Certificate
2000-10-30
2002-03-26
Bishop, Steven C. (Department: 3722)
Cutting by use of rotating axially moving tool
Processes
Bit detachable
C408S214000, C408S213000
Reexamination Certificate
active
06361255
ABSTRACT:
FIELD OF THE INVENTION
This invention relates generally to self feeding drill bits and a method of producing a smooth bore hole in wood.
BACKGROUND OF THE INVENTION
In certain applications, it is necessary for a precise bore to be placed in a workpiece. The bore must have a perfect cross section, in shape, as well as, be free from a score line. The entrance and exit holes, as well as, the workpiece bore must be free of, “frazzle,” or small splinters of the workpiece.
For example, electric power companies have certain safety standards, as mentioned above, which apply to holes made in power poles. If these standards are not met, the pole is rejected for use which causes re-drilling or dressing. In the extreme, the pole is discarded. Either of these results, require added labor and materials which increase the costs of the product.
Also, in the building trades, finish work requires smooth unmarred apertures in more expensive woods. In the construction of log homes, precise bores, without frazzle, are required for safety reasons and desired for aesthetics. The woods used for these homes are usually a more expensive species. Any marred or unsafe bores would require more costs through more labor and materials.
DESCRIPTION OF THE PRIOR ART
Drill bits are conventional mechanical components of drills. The bit has a shank with structure for cooperating with the drill to secure the bit and drill together without relative rotational movement between them to insure that when the drill turns so will the bit. The elongated cylindrically shaped body is formed as a spiral land separated by a flute. The body is usually made of a steel alloy.
The lead end of the bit usually has self centering, self feeding cutter elements which are usually made of carbide. Examples of such drill bits and materials are found in U.S. Pat. No. RE 19,182; U.S. Pat. No. 1,887,374; U.S. Pat. No. 4,008,976; U.S. Pat. No. 4,143,723; U.S. Pat. No. 4,134,616; and U.S. Pat. No. 4,356,873.
Applicant's own patent is directed to a single flute bit having a replaceable carbide lead screw and a carbide cutter insert for better chip removal.
U.S. Pat. No. 6,024,520 to Haughton et al is directed to a drill bit for producing circular cross section bores by the use of 3 separate blades on the leading end of the bit.
SUMMARY OF THE INVENTION
A self feeding drill bit for making a smooth bore in a workpiece has a spiral land and flute with a leading end carrying a centered lead screw. The leading end of the bit has a cutter extending from said lead screw to the circumference of the bit. Diametrically opposed to the cutter is an inscriber formed as a curved blade by the periphery of the leading land. In use, the inscriber makes a smooth surfaced cut in the workpiece with the cutter removing the remainder of the workpiece within the scribed cut.
Accordingly, it is an objective of the instant invention to provide a drill bit that is self feeding and produces a smooth bore. The bore has entrance and exit holes without frazzle or splinters.
It is a further objective of the instant invention to provide a drill bit with a leading end having a removable lead screw located between an inscriber and a cutter.
It is yet another objective of the instant invention to teach a method of producing a smooth bore drill hole without frazzle at the entrance or exit.
Other objects and advantages of this invention will become apparent from the following description taken in conjunction with the accompanying drawings wherein are set forth, by way of illustration and example, certain embodiments of this invention. The drawings constitute a part of this specification and include exemplary embodiments of the present invention and illustrate various objects and features thereof.
REFERENCES:
patent: 567271 (1896-09-01), Howard et al.
patent: 1025109 (1912-04-01), Butler
patent: 1417760 (1922-05-01), McPherson
patent: 1887374 (1932-11-01), Emmons
patent: RE19182 (1934-05-01), Emmons
patent: 4008976 (1977-02-01), Holzl
patent: 4134616 (1979-01-01), Christensen
patent: 4143723 (1979-03-01), Schmotzer
patent: 4356873 (1982-11-01), Dziak
patent: 5244319 (1993-09-01), Cochran
patent: 5975813 (1999-11-01), Schmotzer
patent: 6024520 (2000-02-01), Haughton et al.
B & A Manufacturing Co.
Bishop Steven C.
McHale & Slavin
LandOfFree
Drill bit with inscriber does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Drill bit with inscriber, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Drill bit with inscriber will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2880097