Improvements in Coal and Rock Drills.
Year: 1894

page_text: Date of Application, 29th Jan., 1894
Complete Specification Left, 3rd Oct., 1894-Accepted, 3rd Nov., 1894
PROVISIONAT DE MOT
[Communicated from abroad by JOSEPH ANDREW JEFFREY, of Columbuo,
County of Franklin and State of Ohio, in the United States of America,
Manufacturer.]
Improvements in Coal and Rock Drills.
1, OLIVER IMRAY, of No. 28 Southampton Buildings Chancery Lane, in the
County of London, Chartered Patent Agent do hereby declare the nature of this
invention to be as follows:-
My invention relates to a new and improved coal and rock drill, as will be
hereinafter explained referring to the accompanying drawings in which
Fig. 1 is a side elevation of a drilling mechanism embodying my improvements.
Fig. 2 is a rear view.
Fig. 3 is a front view of the motor, its adjustable carrier, and the gearing.
Fig. 4 is a side view of the last said parts detached.
Fig. 5 is a central vertical longitudinal section.
Fig. 6 is a plan view of the adjustable carrier and of the drill adjusting mechanism.
Fig. 7 is a cross section of the drill advancing mechanism.
Fig. 8 shews in plan, in inside elevation, and in end view one of the sections of
the divisible nut.
Figs. 9. 10. 11. 12. 13. and 14 shew details.
Extensive experience with power coal drilling mechanism actuated by steam or
compressed air engines has disclosed to me the several serious difficulties met with
in using such engines for that work. The rotating longitudinally advancing drill
bit experiences frequent variations in the hardness of the material, the cutting points
one instant engaging with material so soft that the engine "races up" to the highest
speed, and at the next instant engaging with particles so hard as to often stop the
rotation entirely. The only reliable remedy with such engines is to make them so
large and powerful that they will be efficient at the times of greatest resistance.
But this necessitates such a weight of metal that the mechanism becomes no longer
readily portable, and is therefore not available, and drills rotated by hand are still
generally preferred.
I have found that by combining with the drill an actuating mechanism capable
of not only causing rotation, but also of storing and applying high momentum, the
difficulties met with in using air or steam engines are overcome, it being impossible
to use fly wheels or other momentum devices.
In the drawings, A represents an electric motor. It is formed of two frame plates
or standards A A2, each being continuous except at the armature apertures a in
one and a' in the other, and a stud shaft aperture a².
1
Between these plates is placed "the field," consisting of a ring A³, with core
segments a, and connecting pieces or neutral parts a, the pole surfaces being
indicated at a. Curved field coils a' are applied to the cores a, all the parts being
arranged as compactly as possible. The field ring A³ is secured between the
plates A', A by through bolts a³.
For drilling mechanism, the weight of the field is reduced to the minimum, regard
being had to magnetic efficiency. An armature A' as large as possible is mounted
in the chamber provided, as above, its shaft As carrying commutator A, and having
one end mounted in the bracket aº, and the other in a bracket A' passing through
and fastened in aperture a'. This armature is designed to have as large a radius
of rotation as possible, and with its heavier parts at a distance from the axis, to
insure a high momentum, for the overcoming of sudden resistance at the drill points.

page_text: It becomes necessary now, to mount the motor in such way that it shall be
universally adjustable, so that the drill can be directed parallel or inclined to the
horizon and placed in one vertical plane or another as necessary. Therefore, I
support the motor upon a trunnioned carrier, having the plate C formed with bevelled
guide lugs adapted to receive the bevelled feet a³ of plates A1, A2, and having
clamping screws c². With this plate C there are formed a drill support at C,
trunnions c and lugs or ears C2.
Trunnions c are seated in holders vertically adjustable upon the main frame or
'upright B. This is formed with standards or legs b connected at the top and bottom
by cross bars B1, B2, and the whole can be clamped in vertical, position by screws
at 1, 2, and pointed sleeves 63 with hand wheels *.
A rotation of the frame and the parts thereon around a vertical axis is permitted
by the parts described.
The trunnion holder has sockets B³ which can be moved vertically so as to permit
adjustment of the motor and drill bodily on the frame.
I use the following devices to advance the drill. D, D¹, are horizontal plates
and d¹, dare vertical plates fastened to said ears C2 of the carrier. G, G, are
separable nut sections, each having a removable threaded brass g' and a holder g2
with a pin g. H is a sliding plate having slots to receive pins g and a stud H¹
passing through slot d in plate D. I is a lever pivoted at i and having a slotted
aperture for said pin H' and a handle at 1'. Moving lever I in one direction or
the other causes plate H to force the nut sections (through pins g) out or in toward
the screw shaft F of the drill bit. J is a gripper which by a thumb nut j can be
clamped tightly against a plate de, preferably an extension of plate D having an
edge curved concentric with pivot i.
The parts described provide not only a powerful device for opening and closing
the nut, but also one which prevents the sections G from moving away from the
stem F, and thereby preventing the breaking or stripping of the threads.
The drill is rotated without interfering with its longitudinal motion by wheel K.
It has an elongated hub k mounted in the part C' of the carrier, and is held thereto
by a clamp K' which revolves around the flange c³. The screw stem F has grooves f
in which fit gibs or feathers detachably mounted in grooves in hub k.
Wheel K is driven by pinion L on a stud shaft / secured to the motor, being
inserted in said aperture a² in plate A². Pinion Lis rotated by a wheel L' which
in turn is driven by the pinion M on the armature shaft. Use has been made
heretofore in power drills of a master wheel having internal peripheral teeth
engaging with the engine pinion. But with a motor mechanism, which must be
both light and powerful, the gearing becomes cumbersome when the internally
geared master wheel is used. I use a light but powerful motor of high speed (to
obtain momentum) and yet by the gearing set forth avoid making the parts either
complicated or cumbersome.
In order to hold the motor and the drill in proper position as to the horizon. I
provide means for rigidly fastening them after adjustment. N is a clamp brace
pivotally connected to the carrier and extending to a clamp at O. The latter is
supported by a shaft o whose ends are secured in sockets B. The clamp is swivelled
to the shaft or bar o and has a gripper O' with a handle o' which can be opened to
permit brace bar N to move and can then be forced down to bite said bar tightly
to prevent it from moving after adjustment.
A motor having such plates as at A1, A2 is particularly well adapted for this
drilling mechanism as they not only act to assist in magnetic work, but obviate the
necessity of the stands or brackets generally used with motors, and enable me to
produce a light compact machine. These plates are not only adjustable on the
carrier or drill support, to properly place the gearing, but can be readily detached
therefrom, for repair or other purpose, as is frequently necessary in the mines.
They prevent the excess of cuttings and foreign material to the armature. There
are however, some of the features of the invention which will permit of modifications
in the motor.

page_text: 1 arrange the parts so that the operator, who generally stands in the rear of the
frame or upright B can readily observe and attend to not only the drill feeding
devices G, H, I, but also the commutator of the motor, these parts lying in the rear,
while the gearing is all placed in front.
The gearing at K, L, L' and M is housed in a casing as indicated by dotted lines
in Figs. 3 and 4 so as to prevent the access of foreign materials, or accident to the
operator; the encasing being readily accomplished by reason of having the gear
wheels arranged as described in relation to the other parts.
29th day of January 1894.
ABEL & IMRAY;
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Coal and Rock Drills.
I, OLIVER IMRAY, of No. 28 Southampton Buildings, Chancery Lane, in the
County of London, Chartered Patent Agent, 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 a new and improved coal and rock drill, which I shall
describe referring to the drawings accompanying my Provisional Specification.
Fig. 1 is a side elevation of a drill mechanism according to this invention.
Fig. 2 is a rear view.
Fig. 3 is a front view of the motor and gearing.
Fig. 4 is a side view of the motor and its carrier.
Fig. 5 is a central vertical longitudinal section.
Fig. 6 is a plan of the adjustable carrier and of the drill feeding mechanism.
Fig. 7 is a cross section of the drill feeding mechanism.
Fig. 8 shows in plan, in inside elevation, and in end view one of the sections of
the divisible nut.
Figs. 9, 10, 11, 12, 13 and 14 show details.
Considerable difficulties attend the usual coal or rock drilling mechanism
actuated by steam or compressed air engines. The drill meets material varying in
hardness, sometimes it is so soft that the engine races and at the next instant it is
so hard as often to stop the rotation of the drill. It is therefore necessary to
make such engines so large and powerful that they are capable of overcoming the
greatest resistance. But this involves so much weight that the mechanism is not
readily portable or available and consequently hand drills are still generally
preferred.
By combining with the drill actuating mechanism capable of not only causing
rotation, but also of storing and applying high momentum, it is possible to avoid
the difficulties met with in using air or steam engines for which it is impossible to
use fly wheels or other momentum devices.
In the drawings, A is an electric motor having two side plates A' A' with
holes a a' for the armature shaft and a hole a² for a stud shaft.
Between these plates is placed "the field" consisting of a ring A³, with core
segments a, and connecting pieces or neutral parts a, the pole surfaces being
indicated at a. Curved field coils are applied to the cores a, all the parts being
arranged as compactly as possible. The field ring A³ is secured between the
plates A' A' by bolts a³.
An armature A' as large as possible is mounted between the plates A' A², its
shaft A carrying a commutator A, and having one end mounted in the bracket a,
the other in a bracket A'. This armature having a large radius with its heavier
parts at a distance from the axis, has a high momentum to aid in overcoming
sudden resistances to the drill.

page_text: In order that the motor may be universally adjustable I support the motor upon
a trunnioned carrier having its plate C formed with lugs c¹ adapted to receive the
dovetail feet a³ of the plates A1 A2 and having clamping screws c². This plate C
has a drill support at C, trunnions c and lugs or ears C².
The trunnions c are journalled in sockets B3 vertically adjustable upon the main
frame or upright B which has standards & connected at the top and bottom by cross
heads B B carrying screws 1 pointed sleeves 63 with hand wheels b*.
The framing can rock on the trunnions c in a vertical plane and can be raised or
lowered by moving the trunnion sockets B³.
GG are
The drill is fed by the following mechanism. D D¹ are horizontal plates
and dd2 are vertical plates fastened to said ears C2 of the carrier.
separable nut sections, each consisting of a removable threaded bush g' and a
holder g2 with a pin g projecting into an inclined slot in a sliding plate H which
has a stud H¹ passing through a slot d' in the plate D into the slot of a lever I
which is pivotted at i and has a handle I¹. By moving the lever I and plate H in
the one direction or the other the nut sections by the pins g engaged in the oblique
slots are moved away from or in toward the feed screw F. J is a gripper which
by a thumb nut j can be clamped tightly against d the curved edge of the plate D
the sections G of the nut being thus prevented from becoming shifted by
vibration.
The drill is rotated without interfering with its longitudinal motion by the
wheel K which has a long boss k mounted in the, part G' of the carrier, and is held
by a clamp K' which revolves around the flange c³. The screw F has grooves fin
which fit feathers detachably mounted in grooves in boss k.
The wheel K is driven by pinion L which is mounted on a stud shaft / and
rotated by a wheel L' driven by the pinion M on the armature shaft.
In order to hold the motor and the drill at the desired inclination a clamp
brace N jointed to the carrier extends to a clamp at O on a shaft o having its ends
secured in sockets B. The clamp has a handle o' and gripper O' which can be
opened to permit the brace bar N to move and can then be turned so that the bar
is tightly clamped.
The plates A A² of the motor assist in the magnetic work besides acting as
supports for the armature. They are adjustable on the carrier or drill support, to
bring the gearing into position and can be readily detached therefrom, for repair or
other purposes. They also prevent the access of foreign material to the armature.
The gearing at KL L' and M may be housed in a casing so as to prevent access
of foreign matter or accident to the operator.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
1. The combination of an electric motor and coal or rock drill with its driving
and feed gear mounted upon trunnions in a universally adjustable frame substan-
tially as described.
2. In combination with the drill and feed screw the divided nut, sliding plate
and lever for moving the nut sections, and clamp for the lever substantially as
described.
Dated this 3rd day of October 1894
ABEL & IMRAY,
Agents for Applicant.