Improvements in Miners' Drills.
Year: 1898

page_text: Date of Application, 22nd Nov., 1898-Accepted, 23rd Dec., 1898
COMPLETE SPECIFICATION.
Improvements in Miners' Drills.
I, HENRY AYLMER, of College Street, in the Town of Richmond, in the County
of Richmond, in the Province of Quebec, Canada, Advocate, do hereby declare the
nature of this invention and in what manuer the same is to be performed, to be
particularly described and ascertained in and by the following statement:-
-
My invention relates to improvements in drills and the object of the invention
is to design a convenient form of drill in which the sharpened point may be readily
changed when it becomes dull and a new sharpened point substituted thereby
furnishing miners and others with drill points of a first class quality and temper
and avoiding the necessity of miners and others carrying a heavy weight of metal
around to the different work in which they may be employed also being very useful
as applied to steam drills and it consists essentially of providing at the point end of
the drill proper a dove-tailed groove and a drill point having a dove-tail shaped
base, notches being made in the drill at the end into which fits a pin, which extends
through the base of the drill point and thereby retains the point centrally in
position as hereinafter explained.
Fig. 1, is a perspective view of portion of a drill showing my improved point.
Fig. 2, is a perspective view showing the various parts separated.
In the drawings like letters of reference indicate corresponding parts in each
figure.
A is the main body of the drill, which is provided at the point end with a cross
dove-tail shaped groove a and the oppositely cut notches a at the centre of the
end and extending into the groove ạ. B is the drill point, which is provided with
a central hole 6 of corresponding size to the notches a¹.
The drill point B has preferably a dove-tail shaped base bl. C is a pin, which
is designed to be passed through the notches a¹ and hole 6 of the drill point when
such point is inserted in position as shown in Fig. 1.
Although I show the pin C fitting into the notches and the base of groove a
perfectly flat it will of course be understood that in the former, such pin C might
extend through holes and be riveted in the end of the body A, so as to hold the
jaws of the slot securely together and prevent any possibility of their spreading,
and the base of the groove a may be rounded or made any suitable shape, to fit a
point made likewise.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what I
claim as my invention is:-
In a drill, the combination with the body proper provided with a groove extend-
ing across the end and side notches extending into the groove in the contra of the

page_text: sides, of the drill point having a correspondingly formed base to the groove in the
body and a central hole, and a pin extending through the notches and central hole
in the point as and for the purpose specified.
Dated the 92nd day of November 1898.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.