An Improvement in Augers.
Year: 1891

page_text: Date of Application, 21st Apr., 1891
Complete Specification Left, 18th July, 1891-Accepted, 22nd Aug., 1891
PROVISIONAL SPECITIATION.
An Improvement in Augers.
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 this invention (a communication to
me from abroad by William Brede and Leon de la Nux, both of l'aauhau Mill,
Hamakua, Hawaii) to be as follows :-
This invention relates to an improvement in augers; and has for its object to
provide a means whereby cutters may be detachably attached to the web of the
shank in such manner as to be expeditiously and conveniently applied and removed,
the cutters being adapted to define the contour of the hole to be cut and prevent the
web, upon entering the wood, from tearing, the upper surface thereof. The shank
of the auger is of the usual twisted form, but it is provided at its cutting end with
slots or notches which are situated at opposite sides of the web and are of dovetail
tapering form, the metal of the web at each side of each slot being carried
downward to form spurs so that the length of the notches is greater than the
thickness of the web. Each notch is fitted with a cutter, the side edges of which
are dovetailed to fit in the notch. The lower edge of the cutters is preferably
semi-circular and bevelled downward upon the inner face and the cutters are
wedge-shaped or tapering. Each cutter has a hole near its upper edge, which, when
the cutters are in position, register with a corresponding hole in the web, through
which a pin is inserted to secure the cutters in place. It will be readily observed
that the cutters may be expeditiously and conveniently detached and others
substituted when occasion may demand, the attachment being effected by driving
the pin outward first in one direction and then in the other when both of the cutters
are to be removed.
31
11001
A. MELVILLE CLARK.
By A. M. & Wm. Clark,
53, Chancery Lane, London, Patent Agents.
COMPLETE SPECIFICATION.
An Improvement in Augers.
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 this invention (a communication to me from
abroad by William Brede and Leon de la Nux, both of Paauhau Mill, Hamakua,
Hawaii) do hereby declare the nature of this invention and in what manner the
same is to be performed, to be particularly described and ascertained in and
by the following statement :-
This invention relates to an improvement in augers, and has for its object to
provide a means whereby cutters may be detachably attached to the web of the
shank in such manner as to be expeditiously and conveniently applied and removed,
the cutters being adapted to define the contour of the hole to be cut and prevent
the web upon entering the wood from tearing the upper surface thereof.
The invention consists in the novel construction and combination of the several
parts, as will be hereinafter fully set forth and pointed out in the claims.
Reference is to be had to the accompanying drawings, forming part of this
Specification, in which
Figure 1 is a side elevation of an auger having the improvement applied.

page_text: Figure 2 is an enlarged diametrical section through the shank.
Figure 3 is an enlarged partial side elevation of the shank with one cutter
removed, and
Figure 4 is a perspective view of the cutter detached.
Similar figures of reference indicate corresponding parts in all the views.
The twisted shank 10 of the auger is of the usual construction but in the exterior
of the web 11, preferably at opposite sides, dovetail tapering slots 12 are formed
and the metal of the web at each side of each slot is carried downward to form
spurs 13 whereby the length of the slots is rendered greater than the regular
thickness of the web, as is best illustrated in Figure 3. A cutter 14 is adapted to
snugly fit into each slot 12 the side edges of which are provided with a bevel 15 the
lower cutting edge 16 being preferably semi-circular and bevelled downward upon
the inner face. The cutters are essentially wedge-shaped or tapering and are
narrower at the top than at the bottom, and in each cutter an aperture 17 is formed
near its upper edge which apertures, when the cutters are in position upon the
auger, register with a diametrical bore in the web. The cutters are held to place
by a pin 18 of sufficient length to pass through the bore of the web out flush with
the outer face of the cutters or practically so.
It will be readily observed that the cutters may be expeditiously and conveniently
detached and others substituted when occasion may demand, the attachment being
effected by driving the pin outward, first in one direction and then in the other,
when both of the cutters are to be taken out of their sockets. When the pin has
been removed the cutters may be loosened by tapping them slightly upon the top.
It will be further observed that threads are not employed upon the pin or upon
the cutters, all the other surfaces being plain, therefore the parts are not rendered
liable to rust or to become cemented together.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. In an auger, the combination, with the twisted shank or web provided with
dove-tail recesses, of cutters adapted to enter said recesses and a pin passed through
the cutters and the web, as and for the purpose specified.
2. In an auger, the combination, with the twisted shank or web provided with
dovetail tapering recesses and downwardly projecting spurs at each side of the
recesses, of cutters provided with bevelled edges and an essentially tapering body
adapted to fit into the said recesses of the web and a pin passed through the cutters,
and the web, as and for the purpose specified.
A. MELVILLE CLARK.
By A. M. & Wm. Clark,
53, Chancery Lane, London, Patent Agents.