Improvements in or connected with Portable Drilling Machines.
Year: 1893

page_text: Date of Application, 31st Oct., 1893
Complete Specification Left, 31st July, 1894-Accepted, 1st Sept., 1894
PROVISIONAL SPECIFICATION.
Improvements in or connected with Portable Drilling Machines.
I JAMES BRADBURY Junr. of Ashgrove House, Tudor Road Ashley Road,
Bristol, Cycle Manufacturer, do hereby declare the nature of this invention to be
as follows:
This invention relates to improvements in and connected with portable, drilling
machines which has for. its objects to facilitate the removal of broken spokes in
velocipede hubs, and for the purpose of drilling holes in velocipede frames
and lugs.
For this purpose I use the ordinary bevel wheels for rotating the drill spindle
as heretofore, but in order to provide a simple and reliable means of adjusting the
drill, I fix to the top of the frame, and at right angles to the drill spindle, a long
handle, and at the bottom of the frame I fix a bracket, and through this handle
and bracket, and close to the 'frame, are formed, holes, providing two bearings,
through which runs a rod which is connected with the foot or cramp of the
machine.
Between the two bearings and fixed to the rod with a set or thumb screw, I
provide another handle, and the rod between the two handles carries a spiral
spring by means of which the drill is quickly released from the hole.
By the means herein before described, upon compressing the two handles together,
and rotating the drill spindle, the drilling machine will be caused to approach and
drill out a broken spoke from a velocipede hub, or bore a hole in any metal fixed in
the foot or cramp of the drilling machine.
The foot or cramp is formed with a V shaped jaw at the top, and by an opposite
bearing at the bottom, and from the top and at right angles with the V shaped jaw
is an abutment in the form of a quadrant, and a threaded screw runs through a hole
with a corresponding thread at the bottom bearing of the cramp.
The threaded screw being attached to another V shaped jaw I am enabled by
rotating the screw to force this jaw towards the corresponding jaw at the top of
the foot or cramp, affording a means of securely tightening and fixing the drilling
machine to the barrel of a velocipede hub or any part of the tubular frame of
velocipedes.
At the circumference of the quadrant is formed a semicircular slot in which is
placed a threaded thumb screw, which screws into a corresponding threaded hole
formed in the rod, and the extreme end of the rod is connected to the centre of
the quadrant by a rivet, and by these means I am enabled, by loosening the thumb
screw, to place the rod in an upright position, or at an angle with the foot or cramp,
and by tightening the thumb screw to securely fix the rod at any position or angle
required.
Dated this 31st day of October 1893.

page_text: DOMI DELE SPECIFICATION.
Improvements in or connected with Portable Drilling Machines.
I, JAMES
AMES BRADBURY, Junior, formerly of Ashgrove House, Tudor Road,
Ashley Road, Bristol, in the County of Gloucester, but at present residing at
17, Commodore Street, Mile End, in the County of Middlesex, Cycle Manufacturer,
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 said invention relates to improvements in or connected with portable drilling
machines, and has for its object to produce a simple form of instrument in which
the drill is adapted to be set at any desired angle within certain limits thus rendering
the machine applicable for drilling out broken spokes in velocipede hubs and in
other situations where an angular hole is required to be drilled.
For this purpose, a frame is employed in which is mounted a drill spindle carrying
a small bevelled wheel with which gears a larger bevelled wheel driven by a crank
handle.
To the top of the frame and at right angles to the drill spindle is fixed a long
handle, and at the bottom of the frame is fixed a bracket and through the bracket
and corresponding part of the handle are formed bearings for a vertically moveable
square rod which carries the foot or cramp of the machine.
Above the bracket, that is to say, between the bearings for the square- rod is
provided a second handle which is formed with a boss loosely fitting upon the
square rod, and is removeably fixed therewith by means of a set screw whilst between
the upper handle and the boss of the lower handle is provided a spiral spring which
constantly exerts a force to separate the handles and consequently hold the frame
and drill in their normal positions.
The foot or cramp is formed with a V shaped jaw at its upper part, whilst at its
lower end it is formed with a bracket furnished with a tapped hole through which
passes a screw upon the upper end of which is mounted the other jaw of the cramp
by which means the drilling machine may be securely fastened to the barrel of a
velocipede hub or in other desired position.
By pressing the two handles together, that is to say, by depressing the upper
handle and consequently the drill the drilling machine will be depressed and the
drill will be caused to approach the hub, and, upon the rotation of the crank
handle, to drill out a broken spoke from a spoke hole presented to it or to perform
other work, and upon releasing the upper handle, the machine will be raised by
the spring and the drill instantaneously withdrawn from the work.
In drilling the holes in a velocipede hub it is necessary that the same should be
set at an angle to the drill, and for this purpose the cramp is so connected with the
square rod that it is adapted to be set at any desired angle within certain limits.
For this purpose, the upper part of the cramp is formed with an offset which is
pinjointed to the square rod beyond this pinjoint the offset is spread out in the form
of a quadrant and slotted to receive a set screw furnished with a binding disc by
the aid of which the quadrant and consequently the cramp may be fixed either in
true alignment with the rod or at any desired angle within certain limits with
the rod.
Although the chief object of the invention is to drill velocipede hubs or other
parts of velocipedes it is evident that it may be used for a variety of purposes, and
it may therefore sometimes be necessary to arrange the cramp in a different position
with relation to the drill.
For this purpose, it is only necessary to loosen the set screw to withdraw the
square rod from its bearings in the handle and bracket and to turn it a quarter or

page_text: that four separate adjustments may be obtained in this direction.
In lieu of the means herein before described for fixing the drill in its angular
position any other suitable device may be employed for that purpose.
And, in order that the said invention may be more clearly understood and readily
carried into effect, I will proceed, aided by the accompanying drawings, more fully
to describe the same.
DESCRIPTION OF THE DRAWINGS.
Figure 1 is an elevation of a drilling machine constructed according to the
present invention and showing the machine arranged to drill the spoke holes in a
velocipede hub.
Figure 2. is an elevation taken at right angles to Figure 1.
Figure 3. is a detail face view, with part removed, of the clamping device for
regulating the angle of the drill.
Figure 4. is a face view of a modified form of clamping device, and,
Figure 5. is a view taken at right angles to Figure 4.
In the several figures like parts are indicated by similar letters of reference.
Referring to Figures 1. to 3. a. represents a frame in which is mounted upon a
horizontal shaft & a large bevelled wheel b. which is adapted to be rotated by
means of a crank handle & and the bevelled wheel b. engages a smaller bevelled
wheel c. fixed upon a vertical shaft c' mounted in suitable bearings and this shaft c
extends below the frame a. and constitutes a drill spindle, and, as is usual, is
slotted to form a holder for a drill c* which is clamped in place by means of a
nut c².
To the top of the frame a. and at right angles to the drill spindle c¹ is fixed a
long handle a¹ and at the bottom is fixed a bracket a³, and through the bracket a³
and corresponding part of the handle a' and close to the frame a. are formed
holes or apertures constituting bearings for a vertically moveable square rod d¹
which carries the foot or cramp d. of the machine.
Above the bracket a³, that is to say, between the bearings for the square rod d',
is provided a second handle d" which is formed with a boss del provided with a
square hole therethrough to receive the square rod d' and this handle d* is fixed
in the desired position upon the square rod d¹ by means of a set screw d* whilst
between the handle a¹ and the boss d* of the handle d* is mounted around the
square rod da spiral spring d* which constantly exerts a force to separate
the handles a¹ d" and consequently hold the frame a. and drill c* in their normal
positions.
The foot or cramp d. is formed with a V shaped jaw dat its upper part, whilst
at its lower end it is formed with a bracket da furnished with a tapped hole or
bearing through which passes a screw d' upon the upper end of which is mounted
the other jaw d** of the cramp by which means the drilling machine may be
securely fastened to the barrel of a velocipede hub e. as represented at Figures 1.
and 2. or it might be to any part of the tubular frame of a velocipede.
By pressing the two handles a¹ d* together, that is to say, by depressing the
handle a and consequently the drill the drilling machine will be depressed,
and the drill c✶ will be caused to approach the hub e. and upon the rotation of the
crank handle 6* to drill out a broken spoke from a spoke hole presented to it or
perform other work required of it, and upon releasing the handle a' the machine
will be raised by the spring d*³ and the drill c* instantaneously withdrawn from
the work.
In drilling the holes in a velocipede hub it is necessary that the same should
be set at an angle to the drill and for this purpose the cramp d. is so connected
with the square rod d' that it is adapted to be set at any desired angle within
certain limits.
For this purpose, the upper part of the cramp d. is formed with an offset d'
which is pinjointed at d¹ to the square rod d' and beyond this pinjoint d' the

page_text: offset do is spread out into the form of a quadrant and slotted at d³* to receive a
set screw de furnished with a binding disc d* by the aid of which the quadrant d
and consequently the cramp d. may be fixed either in true alignment with the
rod d' or at any desired angle within certain limits with the rod dr.
Although the chief object of the machine is to drill velocipede hubs or other
parts of velocipedes it is evident that it may be used for a variety of purposes, and
it may therefore sometimes be necessary to arrange the cramp d. in a different
position with relation to the drill c* and that shown in the drawings and for this
purpose it is only necessary to loosen the set screw d* to withdraw the square
rod from its bearings in the handle a' and bracket a² and to turn it a quarter
or other desired distance round and then replace it in position and it will thus be
seen that four separate adjustments may be obtained in this direction.
In the example given at Figures 4. and 5. a slightly different form of clamp
for fixing the cramp d. in an angular position with relation to the rod d¹ is shown.
In this case, the projection or quadrant d from the upper part of the cramp d.
fits loosely into an open ended slot formed at the lower end of the square rod d
and that part of the square rod is formed with a threaded boss d¹** through
which screws the binding screw d the inner end of which impinges upon the
quadrant d and thus fixes it in the desired position.
By the means hereinbefore described an extremely portable drilling machine is
obtained which is inexpensive to construct, easy to manipulate and adapted not
only to the drilling of hubs and other parts of velocipedes but to a variety of other
work where it is desired to vary the direction of the drill.
In cases where it is desired only to drill straight holes the cramp may be rigidly
fixed with the vertically moveable spindle whilst still retaining the handles a' d*
and the spring d*³.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. In a portable drilling machine, the combination of a cramp for fixing the
machine with the work attached to the machine in such manner that the drill
may be set at any angle within certain limits and means for fixing it in the
position desired, substantially as herein shown and described and for the purpose
stated.
2. In a portable drilling machine, the combination of a drill spindle mounted
in a frame, means for rotating the spindle, a rod mounted with capability of
vertical movement in bearings carried by the frame, means for preventing the
rotation of the rod, a cramp for fixing the machine to the work attached to the
lower end of the rod in such manner that the drill may be set at any desired angle
within certain limits, a horizontal handle fixed with the frame, a corresponding
handle removeably fixed with the vertically moveable rod and a spring located
between the handles for forcing them apart, substantially as herein shown and
described and for the purpose stated.
3. In a portable drilling machine, the combination of a drill spindle mounted in
a frame, means for rotating the spindle, a rod mounted with capability of vertical
movement in bearings carried by the frame, a cramp attached to the lower end of
the rod for fixing the machine with the work, a horizontal handle fixed with the
frame, a corresponding handle fixed with the vertically moveable rod and a spring
located between the handles for forcing them apart, substantially as herein shown
and described and for the purpose stated.
Dated this 31st day of July 1894.
VAUGHAN & SON,
Agents for the Applicant.