An Improved Cutter or Drill.
Year: 1896

page_text: Date of Application, 10th Jan., 1896
Complete Specification Left, 9th Oct., 1896-Accepted, 14th Nov., 1896
PROVISIONAL SPECIFICATION.
An Improved Cutter or Drill.
GEORGE WILLIAM DAVIS, of Castle View Lodge Road West Bromwich, in
the County of Stafford, Weights and Measures Inspector, do hereby declare the
nature of this invention to be as follows:-
My invention relates to that particular class of cutter or drill which is required
to drill holes larger in diameter at the base, or any given depth, than at the top.
In adjusting weights, particularly thin ones, a difficulty is encountered which it is
intended by my invention to obviate.
When a weight requires adjusting it is invariably done by drilling a hole within
the weight, and substituting a metal of higher specific gravity as lead &c.; and it
often happens especially if the weight be subjected to rough usage that the lead
becomes loose and very often lost thus rendering the weight unjust.
In a drill constructed in accordance with my invention I provide at some point
in its base or cutting end, a conical point not concentric with the drill, which will
enter a similar cone formed at the base of a previously drilled hole.
The improved drill enters the previously prepared hole, so that the conical point
will reach the cone at the base of the hole; and then owing to the different planes
of the cones the tooth on the drill will be forced to one side of the hole, and as
the drill revolves the metal will thereby be dislodged, and thus prevent the
adjusting material from falling out when in use.
The drill may also be formed by having a tooth attached to one side of a piece
of metal, the side directly opposite the cutting tooth being forced down the
inclined plane of the cone formed at the base of the hole by an ordinary common
drill.
Dated this 8th day of January 1896
GEO. WM. DAVIS.
COMPLETE SPECIFICATION.
An Improved Cutter or Drill.
I, GEORGE WILLIAM DAVIS, of Castle View Lodge Road West Bromwich in
the County of Stafford Weights and Measures Inspector, 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 :-
My invention relates to that particular class of cutter or drill which is
required to drill holes of larger diameter at the base, or any given depth, than
at the top.
In adjusting weights, particularly thin ones, a difficulty is encountered which it
is the object of my invention to obviate.
If a weight be drilled with a parallel hole and then adjusted with lead, it often
happens especially if the weight be subjected to rough usage, that the adjusting
material becomes loose and very often lost thus rendering the weight unjust.
The object of my present invention is to prevent this by constructing a cutter in
the manner illustrated in the accompanying sheet of explanatory drawings.
'מן

page_text: The improved drill enters the previously prepared hole so that the conical
point A touches the base of the hole, as in Fig. 5, and then owing to the different
planes of the cones, the cone. A will be forced to the centre of the hole and in so
doing will force the tooth C to one side of the hole, and as the drill revolves the
metal will be dislodged as in Fig. 6.
Fig. 1 is a front elevation, Fig. 2 a side elevation, and Fig. 3 a plan, of the
improved cutter when formed of one piece of metal, and the amount of eccentricity
given to the conical point A will determine the amount of undercut.
Fig. 4 is a section through a hole drilled with an ordinary drill ready to receive
the improved drill as shown in Fig. 5.
Fig. 6 is a section through the hole after being undercut with the improved
drill.
Fig. 7 is a section through the hole showing the drill but without the cone A as
in Figs. 1, 2, 3, & 5, the back of the drill B being forced down the inclined plane at
the base of the hole forces the tooth C¹ under.
Fig. 8 is an elevation of the cutter provided with a separate cutting tooth C.
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 is :-
(1.) A drill constructed with a cone within its base, for the purposes of under-
cutting a hole substantially as hereinbefore described and as illustrated in Figs. 1,
2, 3, & 8 of the accompanying sheet of explanatory drawings.
(2.) A drill, employing the conical base of a previously prepared hole as a means
for undercutting the same, substantially as and for the purposes hereinbefore
described and as illustrated in Figs. 4, 5, 6 & 7 of the accompanying sheet of
explanatory drawings.
Dated this 8th day of October 1896.
GEORGE WILLIAM DAVIS,
Applicant.