Cutting by use of rotating axially moving tool – Tool or tool with support – Having axially extending peripheral cutting spur
Patent
1990-01-03
1992-03-03
Bishop, Steven C.
Cutting by use of rotating axially moving tool
Tool or tool with support
Having axially extending peripheral cutting spur
408226, 408230, B23B 5102
Patent
active
050927191
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to an auger bit for drilling wood, such as for preparing holes which can be used as blind- or through holes for fastening together wooden structures, such as furniture, toys, etc.
BACKGROUND OF THE INVENTION
Drills suitable for producing blind- or through holes have been known for a long time in the woodworking industry, but those known drills are suitable for drilling holes only of low depths and the surface quality of the walls of the hole is also not satisfactory. The technical book "Faforgacsolo Szerszamok" (Muszaki Kiado publisher, Hungary, 1984) describes drills which are suitable for producing holes of such kind.
The disadvantage of the known wood augers is generally that the cut chips are guided by the cutting edges into a narrow space where the chips are accumulated and can cause clogging to such an extent that the cutting edge often burns off or peels off.
The formation and the pitch of the spiral shape of known shell bits is not suitable for assuring the transporting of the chips outward from the borehole. The known shell bits fill in the entire cross section of the hole, so the transporting of the chips is hindered. Therefore, these known augers are not suitable for continuous operation. The accumulation of chips in the borehole can be eliminated in the case of known auger bits only by lifting the drill out of the borehole several times during drilling, therefore the drilling efficiency is very low.
DESCRIPTION OF THE INVENTION
The aim of this invention is to produce an industrial auger bit for wood in which the cutting edges are always easily available for drilling due to the structural features of the auger bit which can be maintained by grinding, the auger guiding the chips continuously outwardly from the borehole without the risk of accumulation and clogging. Therefore the auger bit is suitable for producing deep holes and grooves during continuous operation.
The present invention fulfills this aim by providing an industrially useful auger bit, which has concave curved chip guiding surfaces when viewed from the direction of the shank and a chip lifting spiral is formed on the shank as the continuation of the chip leading surfaces.
As used throughout the specification and the claims the term "wood" is intended to denote wood as well as other like materials such as plastics and leather, in which an auger bit can be used, as will be readily appreciated by a person having average skill in the art.
A further characteristic of the present invention is that the shank side part of the chip guiding surface fits essentially to the top surface of the cutting body along the central curved line which is parallel to the cutting edge.
The chip lifting spiral or double spiral is suitably made from the material of the bore rod and is suitably integral therewith. The chip lifting spiral can be spring steel with a triangular or parallelogram cross section.
The shank of the auger bit is suitably formed as a Morse cone with the cutting head separably attached to it, which attachment has a spiral or double spiral on its exterior surface and which can be fixed to the drill shank. In this suitable embodiment the shank is attached by right hand thread to the cutting body.
Suitably a truncated cone surface is formed with a threaded boss which protrudes from the top of the cutting body, and is adapted to penetrate a complementarily formed at least partly threaded cavity within the shank.
DESCRIPTION OF THE DRAWING
Embodiments of the present invention are described further with reference being had to the drawing, wherein:
FIG. 1 is a side elevational view of the auger bit of the present invention;
FIG. 2 is a side elevational view of the auger bit of FIG. 1 turned by 90.degree.;
FIG. 3 is a top elevational view of the cutting body of the auger bit of FIG. 1;
FIG. 4 is a schematic side view of the shank having a chip lifting double spiral with a parallelogram cross section;
FIG. 5 is a schematic side view of the shank having a chip lifting double spiral wit
REFERENCES:
patent: 877831 (1908-01-01), Creedon
patent: 2358077 (1944-09-01), Koett
patent: 4852670 (1989-08-01), Peetz et al.
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