IMPROVEMENTS IN AUGER BITS
Year: 1884

page_text: PROVISIONAL SPECIFICATION.
I, ALEXANDER MELVILLE CLARK, of the firm of A. M. and Wm. Clark, of
53, Chancery Lane; in the County of Middlesex, Fellow of the Institute of Patent
Agents, do hereby declare the nature of the said Invention for "IMPROVEMENTS
IN AUGER BITS" to be as follows:-
This invention consists in a solid centre stem auger bit which not only possesses
greater stiffness and strength than the ordinary bit, but which provides a much
readier clearance for the chips and is therefore not so liable to choke, may be much
more easily worked and sharpened and repaired and also makes a clean or
smooth cut.
The bit stem is mounted or formed with a single twist blade which is an integral
portion of the bit and forms a quick flat screw thread around the solid centre
stem that terminates at its forward end in a gimlet screw. The advance end of
the blade has a sharp knife or chisel cutting edge and preferably but not
necessarily spread sharp lips or teeth. From this it will be seen that this auger
bit has but one edge or side cut. A hole can be made by it much more easily,
speedily and smoothly than is practical with the ordinary double twist-bit having
no solid central stem and a much larger, quicker and readier escape passage for the
chips or borings is provided, thereby reducing the liability to choke. Much grater
facility, too, is afforded for sharpening and repairing the bit; this being made with
a solid central stem, the bit may be broken or cut away at any point in the twist
and a new end gimlet screw and cutting edge be formed which cannot be done with
augers having no solid central stem. The central stem too adds very materially to
the stiffness and strength of the bit.
•
The invention is applicable alike both to hand and machine augers. When
applied to machino use, it may be run with very much less power than the augers
in ordinary use.

page_text: I, ALEXANDER MELVILLE CLARK, of the firm of A. M. and Wm. Clark, of
53, Chancery Lane, in the County of Middlesex, Fellow of the Institute of 'Patent
Agents, do hereby declare the nature of the said Invention for "IMPROVEMENTS
IN AUGER BITS," and in what manner the same is to be performed, to be
particularly described and ascertained in and by the following statement :-
This Invention consists in a solid centre stem auger bit, substantially as
hereinafter described and claimed, and which not only possesses greater stiffness
and strength than the ordinary bit, but which provides a much readier clearance
for the chips and is therefore not so liable to choke, may be much more easily
worked and sharpened and repaired and also makes a clean or smooth cut.
⋅
Reference is to be had to the accompanying drawings forming a part of this
specification, in which similar letters of reference indicate corresponding parts in all
the figures.
Figure 1 represents a longitudinal view of a simple twist auger bit, embodying
the invention. Figure 2 a front end view of the same. Figure 3 a cross section
thereof, on the line xx in Figure 1; and Figure 4 a longitudinal section of the
forward end of the bit on the line y y in Figure 1.
"
In the drawing, A indicates a solid centro bit stem mounted or formed with a
single twist blade B which is an integral portion of the bit and forms a quick,
flat screw thread around the solid centre stem that terminates at its forward end
in a gimlet screw b. The advance end of the blade B has a sharp knife or chisel
cutting edge c and preferably but not necessarily spread sharp lips or teeth dd.
From this description it will be seen that this auger bit has but one edge or side
cut. A hole can be made by it much more easily, speedily and smoothly than is
practical with the ordinary double twist-bit having no solid central stem and a
much larger, quicker and readier escape passage for the chips or borings is provided,
thereby reducing the liability to choke. Much greater facility too is afforded for
sharpening and repairing the bit; this being made with a solid central stem, the
bit may be broken or cut away at any point in the twist and a new end gimlet
screw and cutting edge be formed which cannot be done with augers having no solid
central stem. The central stem too adds very materially to the stiffness and
strength of the bit.
'
The Invention is applicable alike both to hand and machine augers. When
applied to machine use, it may be run with very much less power than the augers
in ordinary use.
Having now particularly described and ascertained the nature of the said
Invention, and in what manner the same is to be performed, I declare that what
I claim is
The solid auger bit comprising the central stem having the single convoluted
blade formed with a single chisel or knife edge cutter, said cutter being disposed
at one side of the stem and at the lower end of the blade, substantially as shown
and described and for the purpose sot forth.