Improvements in and relating to Drilling Machines.
Year: 1894

page_text: Date of Application, 10th Nov., 1894
Complete Specification Left, 31st July, 1895-Accepted, 19th Oct., 1895
PROVISIONAL SPECIFICATION.
Improvements in and relating to Drilling Machines.
We, WILLIAM ALEXANDER SMITH, Merchant of 6 Hanover Street, PAUL
ROTTENBURG, Merchant of 21 St. Vincent Place, and WILHELM CHARLES
FISCHER, Electrical Engineer of 135 Great Hamilton Street, all in the City and
County of Glasgow, do hereby declare the nature of our invention to be as
follows:-
This invention has reference to improvements in drilling machines, and comprises
the fitting of rollers between the spindle of drilling tool and the carrying frame
or bracket so as to form antifriction bearings; and the operating of the drill
spindle by interchangable speed gearing.
These rollers would preferably be formed of a conoidal or tapered shape and
be mounted to turn freely on spindles or axles fixed radially to an annular ring
loose on drill spindle, or they may be made to revolve loosely without spindles in
While the annular
grooves, or in slots formed in a loose disc preferably dished.
inner surface of carrying frame and overlay flange of spindle would be formed of
a tapered or grooved shape corresponding to that of the rollers which would have
their surfaces of least diameter nearest the spindle of drilling tool.
The interchangeable speed gearing would consist of a loose wheel having stud
projections on its periphery, and adjustably mounted on the inner part of drill
spindle, so that it can be shifted to any suitable position on said spindle and secured
by a pin passing through both. This wheel would be driven by a disc wheel
mounted on a transverse spindle carried in drill frame, said disc wheel being formed
with concentric circles of holes, and so fitted that it can be moved aside while
the stud wheel is being adjusted to the desired position. The holes in the disc
wheel are bevelled at the sides to permit of the free entrance of the studs on wheel
mounted on drill spindle. By this arrangement the drill can be operated at
different speeds as desired. The spindle of disc wheel would be driven by a hand
crank, or by connections from a foot treadle shaft.
Dated the 9th November 1894.
W. R. M. THOMSON & Co.,
96 Buchanan Street, Glasgow, Agents.
COMPLETE SPECIFICATION.
Improvements in and relating to Drilling Machines.
We, WILLIAM ALEXANDER SMITH, Merchant, of 6 Hanover Street, PAUL
ROTTENBURG, Merchant, of 21 St. Vincent Place, and WILHELM CHARLES
FISCHER, Electrical Engineer, of 135 Great Hamilton Street, all in the City and
County of Glasgow, 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 has reference to improvements in drilling machines and consists
in the arrangement of rollers between the revolving drilling spindle carrying the

page_text: tool and the non-revolving part by which the drill spindle is fed forward longi-
tudinally or which resists the back pressure of the cutting action, so as to form
anti-friction bearings and reduce the power required for driving the drilling
machine. The improvements are applicable to all kinds of stationary and portable
drilling machines driven by hand or power.
On the drawing appended hereunto
Figure 1. shows the application of the improvements to a stationary drilling
machine of usual construction, and Figure 2 to a hand drill, Figure 3, showing a
plan of the rollers and roller spindles.
Only those parts of the machines are illustrated which are required to show the
application of our improvements. On Fig. 1 a is the drill spindle which passes
through the bush on which the bevil wheel c is fixed, the spindle being rotated
by the bush by means of a groove and feather. The upper part of the spindle is
reduced in diameter and passes through a bore of the feedscrew d and is secured
therein by a collar e or equivalent usual means, so that it can turn therein, the
feedscrew being threaded through a nut f on the wheel f¹ all these parts being
arranged as usual. Ordinarily the shoulder on the spindle a bears against the lower
end of the feedscrew d with or without washers interposed between them. Our
improvement consists in placing between the feedscrew and shoulder of the spindle
conical or tapered rollers g mounted so as to turn freely on spindles or axles h
fixed radially to a ring loose on the drill spindle, the rollers having their smaller
ends next to the spindle a. Upon the end of the feedscrew d we form or fix a
conical disc d' and form or fix a similar conical disc a¹ at or on the shoulder of
the drill spindle a, the inclination of the surfaces corresponding to that of the
cones g, or the centre of the spindle at the level of the axes of the cones g forming
a common apex for all the cones.
9,
The arrangement shewn by Fig. 2 is similar, the socket k' of the drill spindle k
being formed with an enlargement or disc k¹¹ formed conically towards the rollers,
and another conical surface being formed on or fixed to the frame of the hand
drill. The spindle is surrounded by a ring with axles or pivots h on which the
conical rollers g are mounted.
In both arrangements the pressure on the drill spindle in an axial direction is
exerted against the rollers g and the conical surfaces between which they are
arranged, and as the spindle is rotated, the rollers travel round the centre and
rolling friction only is produced instead of the sliding friction caused by the
usual arrangements, so that the power required for driving the machines is
reduced.
It is obvious that a similar arrangement of rollers between the surfaces receiving
the axial pressure on the drill spindle can be arranged in case of any other con-
struction of drilling machine. For instance where the spindle passes through a
sleeve formed with a rack and is fed down by means thereof, the rollers are arranged
between the bottom end of this sleeve and a collar on the spindle. Instead of the
axles or pivots for the conical rollers being fixed on the outside of a hoop they
may be fixed to the inside of a hoop surrounding the rollers, said hoop fitting
preferably over the edges of the conical discs on which the rollers travel.
Instead of mounting the rollers upon pivots or axles fixed in a hoop, they may
be loose rollers filling the space all round the spindle, the conical discs on which
they roll, or one of them, being in this case recessed so as to hold in the rollers.
The rollers may be barrelled instead of being conical and the discs on which they
roll flat, or hollowed to a less extent, or as an equivalent thereof spherical balls
may be used, in which case the discs or surfaces on which they roll are formed
preferably as recessed cones.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, we declare that what we
claim is―
In drilling machines the arrangement of rollers or their equivalents between the

page_text: drill spindle or a part fixed or formed thereon and the non-rotating part of the
machine receiving the axial thrust on the drill spindle.
Dated the 30th day of July 1895.
R. J. URQUHART,
57, Barton Arcade, Manchester, and 5, Clayton Square, Liverpool,
Consulting Engineer and Patent Agent.