Rock Drilling and Channeling Machine.
Year: 1890

page_text: Date of Application, 4th Mar., 1890
Complete Specification Left, 19th Mar., 1890-Accepted, 19th Apr., 1890
PROVISIONAL SPECIFICATION.
Rock Drilling and Channeling Machine.
1, HERBERT JOHN ALLISON, of 52 Chancery Lane, London, in the County of.
Middlesex, Patent Agent, do hereby declare the nature of this invention which has
been cominunicated to me from abroad by Joseph Clement Githens, of the City,
County and State of New York, United States of America, Mechanical Engineer, to
be as follows:-
My invention relates to machines for drilling and channeling rock, such for example
as are employed in quarrying; and my invention consists primarily in the combination
with the drill-stocks of a double or twin drill, of a cross-head detachably attached
thereto and adapted to carry a channeling-bit, whereby the twin drills may at pleasure
be operated, one or both, to drill round holes by means of the usual drill-bits attached
to the drill-stocks, or be operated simultaneously to cut a channel by means of a
channeling-bit carried by the cross-head attached to the drill-stock, the said usual
drill-bits being detached therefrom.
The twin-drill is composed of two cylinders, which may be of the same piece of
metal, and each cylinder has a valve-chest. The drill-stocks are preferably con-
tinuations of the piston-rods one in each drill and they are similar and each is
provided with or has formed upon it at its lower end a chuck. The twin-drill is
mounted to slide longitudinally in a shell which is pivoted to a frame which in turn
is mounted upon and arranged to move longitudinally of a quarry bar which bar may
be rotatable on end bearings in a suitable supporting frame. Each of the twin-drills
has an independent rotating mechanism for its piston and the drill-stock_carried
thereby by means of well known ratchet wheels and their spring pawls one for each
piston seated in suitable recesses in a piston-head-piece, which may be common to
both cylinders. A single feed screw working in a threaded aperture in the common
head piece will serve to feed the twin cylinders with the desired movement thereof in
the supporting shell. The pistons are capable of simultaneous reciprocatory move-
ment when the cross-head and its channeling-bit are attached thereto; and at the
same time the independent operation of each of the twin-drills when desired is
provided for by means of a suitable arrangement of ports and valves in the cylinders
and their valve-chests. To effect this I give each valve-chest a steam or air inlet and
these inlets are controlled independently by valves. I provide a steam or air
connection between the two chests controlled by a valve. Each chest has an
independent exhaust. By means of this arrangement it is evident that steam or air
may be supplied through either inlet and a circulation to both chests be established
through the connection between the chests by opening the valve in such connection,
and thus the operation of both drills simultaneously be secured; or that steam or air
may be admitted through either inlet and the valve in the connection between the
cylinders be closed, the chest and cylinder to which the steam is thus supplied will
alone be operated, the other drill remaining inert. The usual cylindrical drill-bits
seated in and held by chucks on the respective drill-stocks may thus be employed to
drill round holes either independently or simultaneously; or the said drill-bits being
detached from the chucks, the drill-stocks will be ready to receive the cross-heads and
to be operated simultaneously in working the channeling-bit. As herein before stated
the principal feature of my invention is the combination, with the drill stocks of a
twin drill, of a cross-head detachably attached thereto and adapted to carry a
channeling-bit, which may thus be operated by the united power of the pistons of
the twin-drill.
The cross-head consists preferably in a plate adapted to fit closely edgewise between
the twin-drill stocks with wings or lugs formed at the opposite edges on the lower end

page_text: of said plate and adapted to fit to and against the ends of the chucks on the drill-
stock. The plate and its lugs may be formed as a forging from one and the same
piece of metal. The plate preferably has at its top edge an overhung shoulder against
which the channeling-bit may abut when seated on the plate, and which may be a
part of the described forging. The lugs are each provided with an upwardly
projecting pin adapted to enter and be seated in the holding chucks, one in each.
These pins are preferably made separate from the lugs and with their lower ends
thickened, which thickened ends are screw-threaded and thus screw-seated in
corresponding threaded apertures in the lugs. By means of these pins the cross-head
is detachably fitted to and secured upon the drill-stocks, the pins passing into the
chucks and therein through the transversely bored clamping-bolts of the chucks,
which are controlled by nuts, which clamping bolts and their nuts are the same as
serve to hold the drill-bits in the respective chucks. The described cross-head may
thus be attached to the twin-drill stocks by simply withdrawing the drill-bits from the
chucks and inserting the pins of the cross-head, or vice versa.
The channeling-bit rests flatwise upon the plate of the cross-head and desirably
abuts at its upper end against the overhung shoulder on said plate; and it may be
held in place by a cap imposed upon the seated end of the bit and a U-bolt passed
transversely through the cap, bit and plate which are coincidently bored for the
purpose, the said bolt having clamping nuts.
It should be understood that 1 do not limit myself to the precise form of cross-
head herein described, nor to the described means for detachably attaching the same
to the twin drill-stocks; nor to the means described for attaching the channeling-bit
to the cross-head. The form of the cross-head may be varied without material
departure from the primary feature of my invention, and the means for attaching the
same to the twin drill-stocks may be altered to suit or conform to the style of chuck
employed on the drill-stocks, while any known and suitable device may be used to
secure the channeling-bit to the cross-head. I find however, that the cross-head and
chucks described, as well as the U-bolt specified for holding the channeling-bit, are
simple, desirable and effective means for carrying out my invention.
When the channeling-bit is being operated by the twin drills it is essential that the
pistons of each drill should be free to reciprocate in their respective cylinders without
the rotation which is usually given them when each piston operates a cylindrical drill-
bit attached to the rod or drill-stock thereof. I have therefore provided means by
which the rotating ratchet wheels on the piston rod may be disengaged of their pawls,
said means consisting in a set screw seated in the cylinder head, one for each pawl,
and projecting exteriorly of said head and having a conical or bevelled bearing-end
engaging the face of the pawl adjacent the ratchet. The incline or angle of the
bevel should be such that when the set screw is turned down past the pawl it will
force or move the pawl sufficiently backward to enable its free end to clear the teeth
on the ratchet. The pawls may thus be disengaged when the channeling-bit is being
operated by the twin drills, and may be reengaged to their ratchets when the
twin drills are operated singly or together to work the usual cylindrical drill bit
of each.
In practical operation the twin drill containing my invention is desirably mounted
upon a quarry-bar, and one of the drills, fitted with a cylindrical bit, may be employed
to drill a hole at one end of the ledge or platform of rock, after which the other drill
may be employed to drill a similar hole at the opposite end of the ledge, and then the
cylindrical bits may be removed, the cross-head and channeling-bit attached, and said
channeling-bit be operated by both the twin drills to cut or channel the rock on a
line between the holes from one to the other. If desired, the twin drills may operate
two cylindrical bits at once, drilling two holes simultaneously along the lines of the
desired cut, and then they may be replaced by the cross-head and channeling-bit and
the rock thereby channeled or cut between adjacent holes.
Dated this 4th day of March 1890.
ALLISON BROS.,
Agents for the Applicant.

page_text: COMPLETE SPECIFICATION.
Rock Drilling and Channeling Machine.
I, HERBERT JOHN ALLISON, of 52 Chancery Lane, London, in the County of
Middlesex, Patent Agent, do hereby declare the nature of this invention which has
been communicated to me from abroad by Joseph Clement Githens, of the City,
County and State of New York, United States of America, Mechanical Engineer,
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 machines for drilling and channeling rock-such, for
example, as are employed in quarrying; and my invention consists, primarily, in the
combination, with the drill-stocks of a double or twin drill, of a cross-head detachably
attached thereto, and adapted to carry a channeling-bit, whereby the twin drills may
at pleasure be operated-one or both-to drill round holes by means of the usual
drill-bits attached to the drill-stocks, or be operated simultaneously to cut a channel
by means of a channeling-bit carried by the cross-head attached to the drill-stocks,
the said usual drill-bits being detached therefrom; and my invention furthermore
consists, subordinately, in the devices and their combinations hereinafter described,
by means of which the stated object of the invention is desirably attained, all sub-
stantially as hereinafter set forth.
Figure 1 is a front elevation, in perspective, of a twin drill such as may be
employed for the purposes of this invention, and showing the same mounted upon a
quarry-bar with the usual cylindrical drill-bits attached to the drill-stocks. Fig. 2 is
an enlarged view, in front elevation, of the lower or chuck ends of the drill-stocks of
the twin drill shown in Fig. 1, and showing a cross-head attached to and uniting the
drill-stocks and a channeling-bit carried thereby. Fig. 3 is a vertical central section
of the part shown in Fig. 2. Fig. 4 is a similar section of the same, taken at right
angles to the section shown in Fig. 3. Fig. 5 is a front elevation of the detached
cross-head. Fig. 6 is a lower end view or plan of the same. Fig. 7 is an enlarged
plan of the top of the twin-cylinders, the cover being removed and disclosing the
rotating mechanism for each piston and a device which may be employed to disengage
the pawls of the ratchets, and thus prevent the rotation of the drill-rods when the
channeling-bit is being operated. Fig. 8 is a vertical cross-section on the line x, x,
Fig. 7.
A, Fig. 1, is a twin drill having the two cylinders a, a¹, which may be made in the
same piece of metal and each having a valve-chest a², a³, respectively. The drill-
stocks a, a, are preferably continuations of the piston-rods-one in each drill--and
they are similar, as shown, and each is provided with or has formed upon it at its
lower end a chuck a", a', respectively. The twin drill is shown mounted to slide
longitudinally in a shell as, which is desirably pivoted to a frame B, that is shown
mounted upon and arranged to move longitudinally of a quarry-bar B¹, which bar
may be rotatable, and hence adjustable, on its end bearings bin a suitable supporting-
frame B2. Each of the twin drills is shown as having an independent rotating
mechanism for its piston and the drill-stock carried thereby, and the same is indicated
in Fig. 7 by the well-known ratchet-wheels a and their spring-pawls a 10-one for
each piston and seated in suitable recesses in a head a", which may be common to
both cylinders as shown. A single feed-screw a¹², working in the threaded aperture a¹³
in the common-head a¹¹, will serve to feed the twin cylinders and their parts with the
desired movement thereof in the shell a³.
It is of course necessary that the pistons and the drill-stocks of the twin drill
should be capable of simultaneous reciprocatory movement when the cross-head and
its channeling-bit, hereinafter described, are attached thereto; and to effect this, and
at the same time provide for the independent operation of each of the twin drills
when desired, I have devised and preferably employ the following arrangement of
ports and valves for the cylinders and their valve-chests.
I give each valve-chest a² and a³ a steam or air inlet c and c¹, respectively, and

page_text: these inlets are controlled independently and respectively by the valves indicated
at c² and c³. At c is indicated a steam or air connection between the two chests and
controlled by a valve c. Each chest has an independent exhaust, such as shown
at c. By means of this arrangement it is evident that steam or air may be supplied
through either inlet, and a circulation to both chests be established by opening the
valve c³, and thus the operation of both drills simultaneously be secured; or that
steam or air may be admitted through inlet c or c¹, and, the valve c³ being closed, the
chest and cylinder to which the steam or air is thus supplied will alone be operated,
the other drill being cut off and remaining inert. The usual cylindrical drill-
bits C and C(shown seated in and held by the chucks of the respective drill-
stocks a and a) may thus be employed independently or simultaneously to drill
round holes; or, the said drill-bits being detached from the chucks, the drill-stocks
are ready to receive the cross-head, as hereinafter set forth, and to be operated
simultaneously in working the channeling-bit, as hereinafter specified.
As hereinbefore stated, the principal feature of my invention is the combination,
with the drill-stocks of a twin drill, of a cross-head detachably attachable thereto and
adapted to carry a channeling-bit, which may thus be operated by the united power
of the two pistons of the twin drill.
At D is shown a cross-head such as I find it preferable to employ. The cross-head
shown consists in a plate d, adapted to fit closely edgewise between the twin drill-
stocks at and a³ and the wings or lugs d¹ provided or formed at the opposite odges on
the lower end of said plate, and adapted to fit to and against the ends of the chucks
carried by the drill-stocks. The plate d and its lugs di may be formed as a forging
from one and the same piece of metal, as shown. The plate d preferably has at its
top edge an overhung lip or shoulder d², against which the channeling-bit may abut
when seated on the plate, and which may be a part of the described forging. The
lugs d' are each provided with an upwardly-projecting pin d³, adapted to enter and
be seated in the holding-chucks a and a', one in each, on the respective ends of the
drill-stocks. These pins are preferably made separately from the lugs and with their
thickened lower ends, which are screw-threaded and thus screw-seated, in correspond-
ingly-threaded apertures in the lugs, as shown at d. By means of these pins d³ the
cross-head is detachably fitted to and secured upon the drill-stocks, the pins passing
into the chucks, as shown, and therein through the transversely-bored clamping-
bolts d³, which are controlled by the nuts do, as shown. The clamping-bolts and
their nuts are the same as serve to hold the drill-bits C and C in the respective
chucks, and the described cross-head may thus be attached to the twin drill-stocks by
simply withdrawing the drill-bits from the chucks and inserting the pins d³ of the
cross-head, or vice versa.
The channeling-bit D₁ rest flatwise upon the plate d, and desirably abuts at its
upper end against the shoulder d², as stated, and it may be held in place by a cap D²,
imposed upon the seated end of the bit, and a U-bolt D³ passed transversely through the
cap, bit and plate, which are coincidently bored through for the purpose, said bolt D³
having the clamping-nuts d', as shown.
It should be understood that I do not limit myself to the precise form of cross-head
herein shown and described, nor to the described means for attaching the same
detachably to the twin drill-stocks, nor to the means shown for attaching the
channeling-bit to the cross-head. The form of the cross-head may be varied without
material departure from the primary feature of my invention, and the means for
attaching the same to the twin drill-stocks may be altered to suit or conform to the
style of chuck employed on the drill-stocks, while any known and suitable device may
be used to secure the channeling-bit to the cross-head.
find, however, that the
cross-head shown, and the chucks described, as well as the U-bolt specified for
holding the channeling-bit, are simple, desirable and effective means for carrying out
my invention.
It is evident that when the channeling-bit is being operated by the twin drills it
is essential that the pistons of each drill should be free to reciprocate in their
respective cylinders without the rotation which is customarily given them when each

page_text: piston operates a cylindrical drill-bit attached to the rod or drill-stock thereof. I
have therefore provided means by which the rotating ratchet-wheels a may be
disengaged of their pawls a¹0, consisting in a set-screw E, seated in the head a", one
for each pawl, as shown in Fig. 7, and projecting exteriorly of said head, as shown
in Figs. 1 and 8, and having a conical or beveled bearing end e, engaging the face
of the pawl adjacent to the ratchet. The incline or angle of the bevel should be
such that when the set-screw is turned down past the pawl it will force or move the
pawl sufficiently backward to enable its free end to clear the teeth on the ratchet.
The pawls may thus be disengaged when the channeling-bit is being operated
by the twin drills, and may be re-engaged to their ratchets when the twin
drills are operated singly or together to work the usual cylindrical drill-bit
of each.
In practical operation the twin drill containing my invention is desirably mounted
upon the quarry-bar, as shown in Fig. 1, and one of the drills, fitted with a
cylindrical bit, may be employed to drill a hole at one end of the ledge or platform of
rock, after which the other drill may be employed to drill a similar hole at the opposite
end of the ledge, and then the bits may be removed, the cross-head and channeling-bit
attached, and said bit be operated by both the twin drills to cut or channel the rock
on a line between the holes from one to the other. If desired, the twin drills may
operate two cylindrical bits at once, drilling two holes simultaneously along the line of
the desired cut, and then they may be replaced by the cross-head and channeling-bit,
and the other thereby channeled or cut between adjacent holes.
my said
Having now particularly described and ascertained the nature of
invention and in what manner the same is to be performed, I declare that
what I claim is :-
1. In a rock drilling and channeling machine, the combination, with the drill-
stocks of a double or twin rock-drill capable of simultaneous reciprocatory motion, of
a cross-head detachably attachable to said drill-stocks, and adapted to carry a
channeling-bit, substantially as and for the purpose specified.
2. In a rock drilling and channeling machine, the combination, with the drill-
stocks of a double or twin rock-drill adapted to carry each a single drill-bit and to
have an independent and a simultaneous reciprocatory motion, of a cross-head
detachably attachable to said drill-stocks, and adapted to carry a channeling-bit,
substantially as and for the purpose specified.
3. In a rock drilling and channeling machine, the combination, with the drill-
stocks of a double or twin rock-drill capable of simultaneous reciprocatory motion
and provided with drill-holding chucks at their lower ends, of a cross-head provided
with arms or pins adapted to be seated in and clamped to said chucks, and to carry
a channeling-bit, substantially as and for the purpose specified.
4. In a rock drilling and channeling machine, the combination, with the drill-
stocks of a double or twin rock-drill capable of simultaneous reciprocatory motion
and provided with chucks at their lower ends having tool holding and clamping
devices for detachably attaching the drill-tools thereto, of a cross-head adapted to
carry a channeling-bit, and provided with arms or pins adapted to be seated in and
detachably attached to said chucks by said drill-tool clamping devices, and inter-
changeably with said tools, substantially as and for the purpose specified.
5. In a rock drilling and channeling machine, the combination, with the tool-
holding chucks of the drill-stocks of a double or twin rock-drill capable of simultaneous
reciprocatory motion and provided with tool-clamping devices to attach the drill-tools
detachably thereto, of a cross-head adapted to fit between said chucks and carry a
channeling-bit, and provided with lugs adapted to fit against the ends of the chucks,
and with arms or pins carried by said lugs and adapted to be seated in said chucks,
and clamped thereto by said drill-tool attaching devices, substantially as and for the
purpose specified.
6. A cross-head for the drill-stocks of a twin rock-drill, consisting in a plate
adapted to fit between the drill-stocks and to carry a channeling-bit, and provided

page_text: with a shoulder against which said bit may abut when seated on said plate, and with
lugs adapted to abut against the ends of said chucks, and arms or pins carried by
said lugs and adapted to be seated in and clamped to said chucks, substantially as
and for the purpose specified.
7. A cross-head for the drill-stocks of a twin rock-drill, consisting in a plate d,
having an overhung shoulder d², lugs d¹, and pins or arms d³, screw-seated in said
lugs, constructed as described, and for the purpose specified.
8. In a rock drilling and channeling machine, the combination, with the chucks of
the drill-stocks of a double or twin rock-drill capable of simultaneous reciprocatory
motion and provided with tool-holding bolts d³ and their clamping-nuts d, of a cross-
head D, consisting in a plate d, adapted to fit between said chucks and to carry a
channeling-bit, and provided with lugs d', adapted to fit against the chuck ends, and
with pins or arms d³ carried by said lugs and adapted to be seated in said chucks
and there held by said tool-holding bolts, substantially as and for the purpose
specified.
9. In a cross-head adapted to be detachably attached to the drill-stocks of a double
or twin rock-drill, the combination of the plate d, the channeling-bit D¹, seated flat-
wise thereon, the cover D2, imposed on said bit, and the U-bolt D³, passed through
coincident apertures in said plate, bit, and cover, together with the nuts d', substantially
as and for the purpose set forth
10. The combination with the piston-cylinders a, a', of a double or twin rock-drill
having, respectively, the valve-chests a², a³, of steam or air inlet ports c and c¹, one
for each chest, and each controlled independently by a valve c², c³, respectively, and
a steam or air connection et between the two chests, controlled by a valve co, together
with an independent exhaust-port ce for each chest, substantially as and for the
purpose specified.
Dated this 7th day of March 1890.