Improvements in Drills and Chucksfor
Year: 1890

page_text: Date of Application, 15th July, 1890-Accepted, 16th Aug., 1890
COMPLETE SPECIFICATION
the County of Kent Engineer 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 Improvements in Drills and Chucks therefor whereby a
strong and efficient drill is constructed as is also a chuck or holder arranged so as to
grip the drill centrally and instantly and at the same time provision is made so that
oil or other lubricant can be readily supplied to the point of the drill without with-
drawing it from its work.
In order that my invention may be properly understood and readily carried into
effect I have appended hereto a sheet of drawings on which
Fig. 1 is a front elevation of a drill constructed according to my invention.
Fig. 2 is a side view of the same.
Fig. 3 is a section through line xx Fig. 4.
Figs. 4 and 5 are side views of other examples of drills constructed according to my
invention.
Fig. 6 is a vertical section of the chuck.
Fig. 7 is a side elevation and
Fig. 8 is a plan of the underside thereof.
It will be seen on referring to the drawings that the drills (a) are formed with a
V shaped groove (b) on either side thereof extending the whole length of the drill, a
drill constructed of this form is not only much stronger than those at present in use,
but the shaped groove (b) is so arranged that oil may be supplied to the point
thereof without withdrawing it from its work, which in some work would be a great
saving of time and is a great consideration.
In some cases I construct the drills a double as shewn in Figs. 1 and 2 thus a great
saving would result in transport.
Another modification of my improved drill would be forming its point end with
two or more different sized drills as fully shewn in fig. 5 thus saving time in changing
drills.
I will now proceed to describe my invention as applied to chucks or holders for
drills constructed as hereinbefore described. The chuck shank or plug c is constructed
of suitable metal of a circular form and is drilled or bored out and screwed or tapped
at one end d to allow of the drill a to pass through, a suitable screw nut e is fitted in
this opening in the shank c to regulate the length of the drill a. The lower end fis
slightly tapered and is grooved out V shaped as shewn more fully in the plan and is
cut through to a point at or near its centre, this V shaped groove will take any sized
drill constructed according to my invention and the lower end of may be formed
tapered with a screw thread thereon having a suitable nut which would screw on
over the spindle and thus spring and tighten the V shaped sides of spindle C into the
V shaped groove in the side of the drill. The end of this form of shank may be used
as a countersink.
In some cases the shank is nearly straight and a collar g passes over the end of the
shank c having set screws g¹ g³ on either side thereof to force or spring the V shaped
inner sides of the shank into the V shaped grooves in the drill.
I wish it to be understood that I do not confine myself to the use of the ✓ shaped
groove in drills alone as it may be used with good results for rimers and other similar
tools without departing from the nature of my invention.
D

page_text: Having now particularly described and ascertained the nature of my inven-
tion and in what manner the same is to be performed I declare that what I
claim is
A drill having a fluted or V shaped groove formed in one or both sides thereof,
a chuck or holder for the same whose sides are of corresponding shape and which
are prung or tightened into the V shaped grooves in the drills and there kept in
position by a collar or screw nut or its mechanical equivalent substantially as berein
described and set forth in the accompanying drawings.
Dated this 14th day of July 1890.
ALFRED MARTIN.