Improvements in Rock-drills.
Year: 1892

page_text: Date of Application, 18th Aug., 1892-Accepted, 11th Feb., 1893
COMPLETE SPECIFICATION.
Improvements in Rock-drills.
I, THOMAS FRANCIS FARRELL, of Paterson, County of Passaic and State of
New Jersey, U.S.A., Mechanical Engineer, my Post Office address being
311 Getty Ave., Paterson, New Jersey, U.S.A., do hereby declare the nature of
my invention and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement :-
The object of this invention is to provide a steam or air rock-drill, simple and
durable in construction, easily handled, and not liable to get out of order, and also
reliable means for rotating the drill.
The invention consists in the improved rock-drill, its valve, and its tripod, and
the combination and arrangement of the various parts thereof, substantially as
will be hereinafter more fully described, and finally embodied in the clauses of
the claims.
Referring to the accompanying drawings, in which like letters of reference
indicate corresponding parts in each of the several figures:
Fig. 1. is a longitudinal sectional view of the improved rockdrill, removed from
the tripod;
Fig. 2. is a front view of the tripod without the pipe-legs, the rear leg holder
being turned upward to fully illustrate its construction;
Fig. 3. is an enlarged detail view of the locking device for the drill rotating
bar;
Fig. 4. is a similar view as Fig. 1, embodying the modified form of my improved
rock-drill;
Fig. 5. illustrates a modified form of the tripod, and
Fig. 6. is an enlarged detail view of the modified form of the locking device for
the drill rotating bar.
In said drawings, Figs. 1, 2 and 3, a represents a cylinder adapted to be moved
up and down in guide or carriage b by means of screw c. This guide or carriage
is provided with a mounting-plate, having a raised rounded portion or disk b³,
adapted to fit on and in the corresponding portion d of shell e, which latter con-
sists of two parts, which are fastened together by bolts e', e³, as clearly shown in
Fig. 1. The bolt extends through the mounting-plate 6' and guide and acts as
a fulcrum for the said guide. By means of the said shell e, the cylinder a and its
guide or carriage b is adjustably secured to the tripod f. The tripod f consists of
the spindle g, provided at each end with a cap or cylinder h, which are held together
by bolt i. To each of said caps is secured or made integral therewith a ball-
socket k, in which rests the ball-shaped end of leg holder or socket ³, in which
latter the pipe or extension leg is secured in the ordinary manner. The ball is
provided with a recess, in which is pivotally secured by a pink the lower rounded
end of bolt kt. The upper end of said bolt k passes through the top
socket k, and by means of its nut holds the ball in its socket in any desired
position. To the bolt i is also pivotally secured a yoke or fork m, carrying the
third or rear leg-holder or leg-socket n, which preferably is made integral with the
said yoke.
of
As I have now described the mounting device of cylinder a and its guide b, their
connection with the tripod, and the construction of the latter, I will now proceed
to describe the construction of the cylinder and its respective drill and valve.
The cylinder a, is provided at its lower end with cylinder head m' and stuffing
box m³, and at its upper end with the cylinder head m³, in which is arranged the
oil hole m*. In said cylinder head are also arranged two or more holes or

page_text: sockets m, in each of which rests a pin m³, pressing against spiral spring m. The
outer and rounded ends of said pins work or operate in recesses or teeth m³, in the
flat surfaces of wheel m³, as shown in Fig. 1. Through the center of said wheel,
and also through the tightening disk or plate mo, passes the upper end of drill
rotating bar m, and rests with its flattened top in a recess in cylinder head m³,
(opposite the oil hole). On said drill rotating bar, and within the cylinder a,
operates the piston m, provided at its lower end with the piston rod m¹³, and drill
bit m". The central portion of the said piston is also provided with a circular
groove m, and incline shoulders m18, m¹, adapted to strike (in the up or down
motion of the piston) alternately against the inclined ends m¹8, and m³, of the
lower part m2, of the valve lever m2. This part mo, is secured to rocker shaft or
pivot m, the latter having its bearings in the joint of the cylinder and the valve
chamber, which are fastened together by bolts or in any desired manner. In said
valve chamber is arranged the double piston valve m", provided at its center with
a ball socket ms, in which rests the ball shaped end m2, of valve lever m", and the
latter is also secured to rocker shaft or pivot m" in any desired manner.
15
In the top of the valve chamber is arranged the steam inlet m², and at one side
and in the center of said valve chamber the exhaust m28. From the valve chamber
the steam enters into the cylinder a, through ports m20 and 30 (Fig. 1.).
In operation the cylinder is first adjusted on the tripod in the required position..
Steam is then applied through inlet m², into the valve chamber, from where it
enters through port mo, into the upper part of cylinder a.
The steam presses now
against disk m10 and wheel m', and thereby locks the drill rotating bar m", with
its flattened end, in the recess of cylinder head m³, and prevents said bar from
turning. The piston is then forced downwards, and as will be clearly seen and
understood, can turn in one direction only. As soon as the incline shoulder m", of
groove ms, strikes against the incline m¹8, of the lower portion mo, of the valve
lever, said lever is thrown over; the piston valve in the valve chamber closes the
port mo, and opens the port m, which latter allows the steam to enter the lower
chamber of cylinder a. Thereby the piston m³, is forced upwards and simul-
taneously the exhaust steam in the upper part of the cylinder passes through
opening or port m 20. At the upward movement of the piston the incline
shoulder m, strikes against incline m¹, and forces the piston valve back to its.
former position, in which the steam enters again the upper portion of the cylinder a,
and the exhaust of the lower part of the said cylinder is free to escape.
During the upward movement of the piston, the rotating bar is free to turn with
its wheel in one direction only, as the pins acting on the teeth of said wheel, prevent
its reversing.
In Figs. 4, 5 and 6, I have shown a modified form of my improved rock-drill,
wherein the drill rotating bar m" is provided on its top with a toothed wheel nº,
adapted to be engaged by the toothed segmental block n', arranged in a recess in
the upper cylinder head. Said block is again provided with two or more pins n³,
operating in sockets * and surrounded by spiral springs nº, the latter being
controlled by set screws nº, as clearly shown in Fig. 6.
On the drill rotating bar operates the drill carrying piston m1, provided at its
center with a circular groove ml, serving as a chamber for the "live steam," as
will be hereinafter more fully described.
Said chamber is connected through channels or ports o³, o* with the upper and
lower part of cylinder a respectively.
To the cylinder a is secured, in any desired manner, the valve chamber. p, in.
which is arranged a cylindrical piston valve, consisting of the piston rod p and two.
sets of piston heads p₁ and p-each set forming a steam chamber p, which is con-
nected with the steam inlet m" through port ps. At each end of the valve chamber
is arranged a cap or head q, to which is secured a metallic plate q¹ with intermediate
rubber cushion .
The upper and lower chamber of cylinder a are connected with the valve chamber.
through.ports r.and r¹ respectively.

page_text: ני
The ports and connect the "live steam chamber with the valve chamber,
and the ports and r, the latter with the exhaust m28.
In operation, steam is applied through inlet m² and port p8 into the upper
chamber (formed by the upper piston heads p' and '), from where it enters
through port into the upper chamber of cylinder a. The drill carrying piston
is thus forced downwards, and, as the rotating bar-by its toothed wheel engaging
the toothed block-is prevented from turning, suid piston can turn in one direction
only.
After the drill carrying piston has been forced downwards as explained in the
foregoing paragraph, the port is closed by the descending piston and the live
steam chamber m is brought opposite the port, leuding from the cylinder a to
the lower chamber of the valve piston, (formed by the lower piston head p* and
lower metallic disk q'). The steam then enters from said chamber m¹s into said
lower chamber through said port and throws the valve piston upwards.
At the same time the exhaust steam remaining in the upper chamber of the valve
piston (that is the chamber formed between the metallic disk q' and upper piston
head p) is forced through port into the exhaust m28.
The valve piston being thrown upwards, steam is allowed to pass from inlet m"
through ports p and 1 into the lower steam chamber of cylinder a, thus forcing the
drill carrying piston m upwards; when the steam in said lower chamber of
cylinder a will pass through port o³ into chamber m¹ and from there through port
into the upper chamber of the valve piston, formed by the upper piston head p* and
metallic disk q', thus forcing said valve piston downwards.
The exhaust steam remaining in the lower chamber of said valve piston passes
through port into the exhaust m28. It is to be understood that the movement of
the drill carrying piston serves to open and close alternately the upper and lower
ports o³ and o, that is to say, when the drill-carrying piston reaches its uppermost
position fit so tightly, by virtue of the bushing around the rotating bar that said
port of is closed, and when the drill-carrying piston is in its lowermost position the
port o enters into the lower cylinder head and is closed thereby.
It appears as if the upper and lower chamber of the cylinder are connected by a
passage formed by the ports o³, o³, and by the live steam chamber m during the
greater portion of the piston's stroke. Such is the case, but practical experiments
have proved that there is at all times sufficient steam pressure in the live steam
chamber m", to overcome an exhaust from the upper to the lower chamber of the
cylinder or vice versa. (The said parts o³ and o³ are about the diameter of the
ports and r¹.) Again the ports and are of approximately the same diameter
as the ports o' and o³, and it can be observed from the drawing (Fig. 4) that said
ports are closed and opened alternately by the end discs p* p* of the piston
valve.
In Figs. 4 and 5, I have also shown a modified form of a tripod, which is provided
with a top plate t, adapted to receive the mounting plate of carriage b. Said top
plate is provided at one side with an inwardly bevelled projection t', adapted to
enguge the bevelled edge of the said mounting plate, and at the opposite side, with
a clamping block t', adapted to adjustably secure the mounting plate to the said top
plate.
Said clamping block is operated by the screw and nut t*.
The top plate t is also provided with downwardly extending bearings to, provided
with conical recesses to, adapted to receive the conical projection t' of arm to. Said
arms, with their projections, are pivotally secured to and adjusted in said bearings
by means of the shaft or spindle to, provided with tightening nut to.
The arms are provided at their free ends with enlargements t", having conical
projections, and are adapted to form the bearing for the sleeve t", the latter
carrying the rear leg holder t¹.
Through said sleeve and through the bearings (1, (1, passes the spindle or
shaft t, adapted to adjustably secure said parts together.
Near the bearings t and on arms are arranged horizontally extending.
,

page_text: projections, 16, to which the front leg holders t", are adjustably secured. Said leg
holders consist of socket 18, provided on its top with a tapered projection ¹³,
adapted to be pivotally and adjustably secured in tapered recess 20 of cup 2-by
means of tapered bolt (22 and tightening nut . The upwardly extending portion
of cup 21 surround the projections (16, and are adjustably secured thereto, by means
of tightening bolt 2, as clearly shown in Fig. 5, of the drawings.
I do not intend to limit myself to the exact constructions shown and described, as
various changes can be made, without changing the scope of my invention.
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-A rock-drill combining therein a cylinder, a cylinder-head secured to each end
of said cylinder, a drill-carrying piston adapted to move up and down in said
cylinder, a drill-rotating bar provided at its top with a flattened portion adapted to
rest in a corresponding recess on the inside of the upper cylinder-head, a wheel
provided on its flattened surface with teeth and arranged to rest partly against the
under side of said flattened portion of the drill rotating bar and also against the
inside of the said upper cylinder-head, a locking plate or disk at the under side of
said wheel and adapted to prevent the rotating bar from turning during the
downward stroke of the piston, pins arranged in said cylinder head and adapted to
operate in the teeth of said wheel, and spiral springs controlling said pins, all said
parts being arranged and adapted to operate substantially as described and for the
purposes set forth.
2 In a rock-drill-rotating device, the combination, with the cylinder, piston, and
cylinder-heads, of a rotating bar, a flattened top made integral with said bar and
adapted to rest in a corresponding recess in the cylinder-head, a wheel provided at
its upper surface with teeth and resting against said flattened top and the said
cylinder-head, pins arranged in said cylinder-head and acting as pawls for said
toothed wheel, and a locking-disk arranged beyond said wheel and adapted to force
the said wheel against the flattened top of the rotating bar and the cylinder head
during the downward motion of the piston, thereby preventing said bar from turning,
substantially as described, and for the purposes set forth.
3-In a rock-drill, the combination, with the cylinder and its guide, of a mounting-
plate secured to said guide and provided with a circular projection 6, a spindle
provided at each end with a cap and around the center part with a shell consisting
of two parts, the upper one of which is provided with a flattened top, to which the
mounting-plate of the guide is pivotally secured, a circular recess arranged in said
flattened top and adapted to receive the circular portion 6, bolts holding said shell
parts together, one of them serving, also, as a fulcrum for the mounting-plate, a bolt
passing through said spindle and holding said caps and shells in place, a ball socket
arranged on each of said caps and made integral therewith, a leg holder or socket
provided at its upper end with a ball adapted to work in said ball-socket, a recess
arranged in said ball, a bolt pivotally secured with its lower rounded portion in said
recess, and with its upper portion in said ball-socket, and a yoke provided with the third
or rear leg-holder and pivotally secured to the spindle, all said parts being arranged
and adapted to operate substantially as described, and for the purposes set
forth.
4—In a rock-drill, the combination, with the cylinder and the piston, of a groove
provided in said piston, a valve-chamber secured to said cylinder, a double-headed
cylindrical piston-valve arranged in said valve chamber, a valve-lever, pivotally
secured in the joint of the cylinder and the said valve-chamber, and provided at its
lower part with inclines, a ball arranged at the upper end of valve-lever, and a ball-
socket arranged in the connecting-stem of the said double-headed piston-valve and,
adapted to engage with said ball, said valve-lever being adapted to be operated by
the groove in the piston of the cylinder, substantially as described, and for the
purposes set forth.

page_text: 5-A rock-drill, combining therein a cylinder, a cylinder head secured to cach
end of said cylinder, the upper one of said heads being provided with a hole or
recess, a drill carrying piston, adapted to move up and down in said cylinder, a drill
rotating bar, a toothed wheel secured to the top of said rotating bar, a toothed block
arranged in the hole or recess of the upper cylinder head, and adapted to engage
said toothed wheel, two or more pins secured to said toothed block, and adapted to
operate in sockets in the upper piston head, spiral springs, surrounding said pins and
adapted to control said toothed block, and set-screws, controlling said spiral springs,
all said parts being arranged and adapted to operate substantially as described and
for the purposes set forth.
6-In a rock-drill rotating device, the combination with the cylinder, pistou and
cylinder head, of a rotating bar, a toothed wheel secured to the top of said bar and
adapted to operate in a recess of the upper piston-head, a toothed block arranged in
said recess and adapted to engage said toothed wheel, two or more pins secured to
said block and adapted to operate in sockets in the cylinder head, and means for
controlling the said toothed block, substantially as described and for the purposes
set forth.
7-In a rock-drill, the combination with the cylinder and its guide, a circular
mounting plate secured to said guide, and provided with a bevelled edge, a top
plate, provided at one side with an inwardly bevelled projection, and adapted to
receive the said mounting plate, a clamping block arranged at the opposite side of
said top plate, and adapted to adjustably secure the mounting plate to the said top
plate, a set screw controlling said clamping block, bearings arranged on the top
plate, arms pivotally and adjustably secured to said bearings by means of a spindle
and tightening nut, said arms being provided at their free ends with enlargements,
serving as bearing for the rear leg holder carrying sleeve, a spindle and tightening
nut adapted to adjustably secure said sleeve to said enlargements, a horizontally
extending projections arranged on each of said arms, and a front leg holder,
adjustably secured to each of said projections, all said parts being arranged and
adapted to operate substantially as described and for the purposes set forth.
8 In a rock-drill,-the combination with the cylinder and the piston, of a groove
arranged in said pistoň, a valve chamber secured to said cylinder, a double headed
cylindrical piston valve arranged in said valve chamber, each piston head consisting
of two disks forming a steam chamber, a cylinder head arranged at each end of the
valve chamber a metallic plate secured to said cylinder head, and a rubber cushion
arranged between said metallic plate and cylinder head, all said parts being adapted
to operate substantially as described and set forth.
Dated this 18th day of Auomat 1809
J. P. BAYLY,
18, Fulham Place, W., Agent for the Applicant.