IMPROVEMENTS IN ROCK DRILLS AND STANDS THEREFOR
Year: 1883

page_text: LETTERS PATENT to Alexander Melville Clark of the firm of. A. M and
W. Clark of 53 Chancery Lane in the County of Middlesex Fellow of the
Institute of Patent Agents for an Invention of IMPROVEMENTS IN ROCK
DRILLS AND STANDS THEREFOR communicated to him from abroad by
Theodore Weld Sterling, of the City County and State of New York,
United States of America, Gentleman
:
PROVISIONAL SPECIFICATION left by the said Alexander Melville Clark at
the Office of the Commissioners of Patents on the 12th May 1883.
ALEXANDER MELVILLE CLARK of the firm of A. M. and W. Clark of
53 Chancery Lane in the County of Middlesex, Fellow of the Institute of
Patent Agents, " IMPROVEMENTS IN ROCK DRILLS, AND STANDS THEREFOR
[communicated to him from abroad by Theodore Weld Sterling, of the City
County and State of New York, United States of America, Gentleman]
"
This Invention relates more particularly to hand rock drills and to stands
therefor.
The Invention consists in novel combinations and arrangements of parts
whereby a series of hammers are made to revolve in concert about a common
centre, and each of said hammers is brought successively in line with the drill
or drill holding spindle of the machine by the mechanism which revolves the series
of hammers, and which, acting in concert with other devices, causes each hammer
to deliver its blow upon the drill or drill holding spindle that is or may be made
to continuously revolve. The Invention having reference more particularly to
hand rock drills constructed to operate as above described, also consists in a novel
method of automatically feeding the drill, and means therefor, whereby the drill is
made to advance toward the rock as fast as required by the process of the boring ;
and it furthermore consists in a certain combination of swivels and slides with the
stand that carries the machine, whereby the machine may be easily and quickly
Price 1

page_text: placed in any desired position; and it likewise embraces other details of con-
struction, whereby increased facility is afforded for operating the drill. The
Invention also consists in a rock drill stand of novel construction suitable for
hand rock drills of different kinds, and in a novel mode of attaching the rock drill
thereto, whereby increased facility is afforded for varying the positions in which
the drill may be arranged to work, and for holding and securing it, as also the
platform of the stand, in place, and for centering the drill or its support relatively
to the length of the platform to prevent the apparatus from canting or falling
over when not secured in position, as well as to bring the drill within the compass
of the platform, thereby facilitating transportation of the apparatus.
Referring to the first part of the Invention, the hammers and mechanism for
operating the same are supported in a carriage or frame which is mounted to slide
in longitudinal grooves in a bed plate. This frame is furnished with end bearings
for a horizontal shaft which has a crank wheel on its rear end and a pair of discs
intermediate of the bearings. The forward one of these discs is provided with
holes equidistant from each other and also from the axis of the shaft with grooves
cut opposite each hole at the periphery of the disc. Holes corresponding in position
to, but of smaller diameter than, those in the forward disc are also drilled in the
other disc. The holes in the discs are fitted with steel pins, that part of these
pins fitting in the forward disc being called the "bammer," and the part fitted
in the rear disc being called the "stem." 'Spiral springs on the stems between
a shoulder of the hammer and the rear disc, press the hammer toward the front of
the machine.
..
:
On each hammer are fitted two friction rollers, one of which bears against a
cam on the frame, and the other fits into the grooves at the periphery of the
forward disc, thus allowing the hammer to move backward and forward but
preventing its rotation on its own axis. The cain is a cylinder (the main shaft
passing through its centre) and it is fastened to the inner side of the front end
of the frame. Its edge, against which the rollers are pressed, is cut in the shape
of a screw, so that when a movement of rotation is imparted to the shaft and the
hammers, each hammer will be pressed back until it has come opposite the upper
part of the machine, when it is relieved from the cam which allows it to go
suddenly forward under the action of the spring and strike the drill spindle which
is fitted in a bearing made to receive it at the front part of the machine. The inner
end of the spindle is of larger diameter than the body, and at the other end is fitted
a block made to receive and hold the drill.
A gear which fits loosely through a recess in the frame, is attached to the
spindle by a groove and feather connection, and the forward end of the shaft of
the machine carries a pinion which is keyed to the shaft and engages the gear
wheel. The pinion and gear may preferably have their numbers of teeth in
proportion of one to two. When the shaft is revolved, the hammers passing
through, the discs upon said shaft are revolved and are pressed back against the
springs by the cam against which the rollers on the hammers impinge, so that each
one in its turn will come opposite and strike the spindle; at the same time the
pinion on the shaft causes the gear wheel and the spindle to revolve, thus rotating
the drill. By this construction a steady rotation is obtained combined with the
blows upon the drill, thus keeping the point constantly cutting into the rock.
A high rate of speed may be obtained as the hammers may be brought into
position rapidly and the blows delivered upon the continuously revolving drill.
When the point of the drill is made to bear against the rock, the combined effect
of the blows and the rotation of the drill, causes the latter to perforate the rock.
The point of the drill is kept up to work (the bed plate having been previously
placed and fastened in its proper position) by means of a feed screw which turns
freely in bearings in the bed plate and passes through a nut on the frame, and is
provided with a hand wheel for rotating it.
In a modification the operative parts of the machine are protected from injury

page_text: by a tubular box made to open on its top side nearly throughout its length and
closed by a cover hinged on its one side engaging with a latch on its opposite side:
A flange is bolted to the front end of the machine on which is cast the cam that
lifts the hammers and that has a central hub bored to receive the journal of the
shaft. The rear end of the shaft rests in a step bearing cast with the box. The
hammers are arranged at equal distances from each other around and parallel with
the shaft and at uniform distances therefrom. These hammers are carried by and
free to slide within or through disks or flanges fast on the shaft, whereby on the
rotation of the shaft the series of hammers rotate with it about a common centre
and are guided in their longitudinal movements, springs as before serving to
press the hammers forward. Each hammer is restrained from rotating about its
own axis by means of. a roller on it arranged to travel in a slot in one of the
discs or flanges, and each hammer has another roller on it which bears by the
pressure of the spring against the stationary cam which is of suitable construction
on its face to cause each hammer in succession as the series of hammers are
revolved in concert with the shaft to be suddenly and forcibly thrown forward
by its spring and deliver its blow on the rear end of the drill spindle which
carries the drill on its forward end by means of a connecting clamp, and which
has a leather or other soft or elastic washer interposed between a flange on said
spindle and the forward end of the main frame or box secured thereto. The drill
is rotated while the blow is being imparted to it and is kept constantly rotating by
means of a pinion on the shaft gearing with a wheel attached to the drill spindle
by a groove and feather connection: A V shaped slide cast on the box fits in
correspondingly shaped grooves or recesses in a right angularly-shaped support to
provide for the passage of the slide through said support. Under or along one side
of the box and parallel with the shaft is a screw which rotates in bearings in the
ends of said box but is restrained by suitable collars on it from longitudinal
movement. This screw works through a nut on the supports and carries on its
outer end a hand wheel, and on the inner end a loose pinion which is connected to
the shaft by an intermediate gear wheel and a sliding clutch or sleeve which
engages with and is disengaged from said pinion according to the direction in
which the sleeve is slid upon the smooth inner end portion of the screw. The
sleeve is fitted to turn with the screw as well as to slide independently along it by:
means of an internally projecting pin on the sleeve arranged to pass through a
longitudinal slot in the screw, or said sleeve may be otherwise fitted. When the'
sleeve is pushed against the pinion, the latter cannot turn without imparting the
same motion to the sleeve, but when the sleeve is drawn away from the pinion the
motion of both are independent. The sleeve has a circular groove in or around.
it for the purpose of receiving the end of a lever pivoted intermediately of its
Jength
'
Secured on the drill spindle end of the box, or flanged thereon, is a casting or
box, bored to receive the drill spindle which has a groove cut around an enlarged
portion of it, to receive within it the opposite end of the lever to that which
engages with the sleeve. A spring fastened to the box bears against the lever to
push the spindle forward, and at the same time to press the sleeve against and into
clutch connection with the pinion.
1
The slide seat or support is secured by a swivel bolt to a split sleeve, which slides
up and down or along a post or column, and is free to turn thereon so that the drill
may be adapted to different positions of working, and when the machine has been
thus adjusted as required it is held in position by a screw bolt, which connects the
two portions of the sleeve. Near the rear end of the box and cast at right angles
with it, is a sleeve containing a shaft which gears by level gearing with the shaft
of the machine and rests in a step bearing cast on the box. A crank handle is
keyed on the outer end of this shaft to which rotary motion is imparted in
operating the drill the motion being transmitted by the bevel gear to the shaft of.
the machine whereby, and through the agency of the discs or flanges springs and

page_text: stationary cam the hammers, rotating in common with the shaft but not on their
own axes, are made to successively deliver their blows on the head of the revolving
drill-spindle. To prevent the friction which would be caused by contact of each
hammer with the head of the spindle, after the delivery of the blow, and before the
hammer is pushed back again by its travel over the face of the stationary cam the
spring of each hammer is made of such length, as that it is fully expanded before
the contact of the hammer with the spindle takes place. At the moment of
contact the hammer rebounds as the spring is too short to press it against the
spindle.
The machine can be made to go forward or backward on its support by means of
the screw working through the nut on the support. The machine may however
be advanced automatically and to this end the clutch or sleeve on the screw is
connected by the lever with the grooved head of the drill spindle which has a
longitudinal movement in its bearing of about three eights of an inch, more or less.
If the point of the drill does not bear against the rock, the blows of the hammers
on the drill-spindle will be received by the leather-washer and in this position of
the spindle, the sleeve is pushed into clutch-connection with the pinion on the
screw. Now as the pinion is driven by the intermediate gear which derives its
motion from the pinion on the shaft the rotary motion communicated to said pinion
is transmitted through the sleeve to the screw thus drawing the machine forward.
This forward movement of the machine will continue until the drill point comes in
contact with the rock, and, upon the machine being fed forward faster than the
boring is accomplished, the sleeve will be drawn away from the pinion and said
pinion continuing to revolve without affecting the sleeve and screw the machine
remains stationary until the progress of the boring has again allowed the spindle
to move forward, and has again caused the sleeve to connect with the pinion for
the purpose of automatically feeding the machine forward.
According to the third part of the Invention the platform of a rock-drill stand is
mounted on wheels to which or to the front wheels are applied blocking screws
arranged to pass through the platform and, when required, to bear down on said
wheels for the purpose of holding the apparatus for rolling or moving away from
the place to which it has been transported for work. Leveling screws may also be
applied to the platform at its opposite end for levelling and steadying the apparatus.
Pivoted to the platform at or near its centre by a bolt is an upper swinging base
or arm parallel with the upper surface of the platform and resting thereon thereon.
This arm, which is arranged to move over the front half or portion of the platform-
top is held in position, either centrally in relation to the length of the platform, or
to either side of a longitudinal centre line, by a forward screw clamp, attached to
said arm and bearing against the underside of the front end of the platform which
end is curved, with a pivot as a centre, to adapt said clamp to it throughout the
sweep of the arm. Rising from the front or free end of this swinging arm or base
within a divided clamping foot-rest thereon is a circulating column of desired
height, and which may be provided with a jamming screw at its top for obtaining
a hold for the apparatus upon the roof of a mine or other place where the drill may
be used. A hand rock drill of any suitable construction is pivoted by a swivel-bolt
at or about the centre of the length of its frame to one side of a split sleeve which
is constructed to be capable of moving around and up or down the column and
which is clamped or held by a bolt when so adjusted
any
By this construction of the stand, and manner of hanging the rock drill'thereon,
the column with its attached drill may be adjusted from the central position either to
the right or to the left by means of the swinging arm or base and be secured when
so adjusted by the clamp and the drill may have its working position still further
changed by adjusting the sleeve up or down or around the column and by rocking
to any desired angle or position the drill frame on its swivel bolt and afterwards
securing it as required.
Such varied adjustments provide in a very simple and effective manner for

page_text: arranging the drill to work in all necessary directions and at different points
without moving the platform, which latter may be levelled and held from moving
as herein before described. When the drill or the column which carries it is
adjusted by the swinging arm into a central position relatively to the length of the
platform, the apparatus will be balanced so far as any tendency it might have to.
tilt or tip over sidewise is concerned and the drill will be brought within the
compass of the platform, thereby facilitating transportation.
Apart from the various adjustments which the construction of the stand and
manner of attaching the drill affords, every facility is provided by means of the
adjustable clamping foot rest split sleeve and swivel bolt, for dismembering the
apparatus including the column when required.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Alexander Melville Clark in the Great Seal Patent Office on the
12th November 1883.
.
33
ALEXANDER MELVILLE CLARK, of the firm of A. M. and W. Clark of
53 Chancery Lane, in the County of Middlesex, Fellow of the Institute of
Patent Agents "IMPROVEMENTS IN ROCK DRILLS AND STANDS THEREFOR
A communication to me from abroad by Theodore Weld Sterling, of the City,
_County and State of New York, United States of America, Gentleman.
This. Invention more particularly relates to hand rock-drills and to stands
therefor. The Invention consists in novel combinations and arrangements of parts
whereby a series of hammers are made to revolve in concert about a common
centre and each of said hammers is, brought successively in line with the drill or
drill holding spindle of the machine by the mechanism which revolves the series of
hammers, and which, acting in concert with other devices, causes each hammer to
deliver its blow upon the drill or drill holding spindle that is or may be made to
continuously revolve. The Invention, having reference more particularly to
hand rock drills constructed to operate as above described, also consists in a novel
method of automatically feeding the drill, and means therefor, whereby the drill is
made to advance toward the rock as fast as required by the process of the boring;
and it further more consists in a certain combination of swivels and slides with
the stand that carries the machine, whereby the machine may be easily and quickly
placed in any desired position; and it likewise embraces other details of
construction whereby increased facility is afforded for operating the drill. The
Invention also consists in a rock drill stand of novel construction, suitable for
handrock-drills of different kinds, and in a novel mode of attaching the rock drill
thereto, whereby increased facility is afforded for varying the positions in which
the drill may be arranged to work, and for holding and securing it, as also the
platform of the stand in place, and for centreing the drill or its support relatively
to the length of the platform to prevent the apparatus from canting or falling over
when not secured in position as well as to bring the drill within the compass of
the platform, thereby facilitating transportation of the apparatus.
accompanying drawings Figure 1 represents a sectional side elevation of a hand
rock drill or machine embodying the combinations and arrangements of parts
which are referred to and included in the first part of the recital of invention
hereinbefore specified. Figure 2 is a top view of the same. Figure 3 a cross
section and Figure 4 a front elevation thereof. Figure 5 is a longitudinal vertical
section of a like hand rock-drill or machine, embracing other features of the
invention as herein previously recited and hereinafter described. Figure 6 a
partially sectional longitudinal elevation of the front part of such modified machine,
showing the hammers and the stationary cam used in their operation. Figure 7 is a
longitudinal vertical section of the front part of said machine, in illustration of the
automatic feeding mechanism. Figure 8 is a top view of such machine with the
cover removed, for the purpose of showing the gears, hammers, and other parts.
enclosed by the tubular frame of the machine. Figure 9 is a rear elevation of said.
machine. Figure 10 is a vertical cross section of the same on the line x c¹ in
figure 8, looking from the rear of the machine and Figure 11 a vertical cross
section on the line y¹y' in figure 8, looking from the front of the machine.
Figure 12 represents a side view of the improved stand for rock-drills, with a hand
rock drill attached. Figure 13 is a horizontal section on the line ³ ³ in figure 12
and Figure 14 is an end elevation of such apparatus.
In the
Referring in the first instance to figures 1, 2, 3 and 4 of the drawings. A is a
bed plate, in which are cut the longitudinal grooves a a. B is the frame of the

page_text: A
machine, and slides in the grooves a a. The screw C, provided with a hand wheel D
turns freely in the bearings bb, at the ends of plate A. The screw C passes
through the nut E cast on the frame B so that by turning the hand wheel D the
machine is made to go forward or back in the guides or grooves a as desired.
shaft F rests in the bearings made for it at the ends of the frame B. On the
shaft F is fastened the crank wheel G, and the two discs H and I The disc H is
provided with holes equidistant from each other, and also from the axis of shaft F
(see figure 3). Grooves e are cut opposite each hole at the periphery of disc H.
Holes are also drilled into the disc I corresponding in position to those of disc H
but of a smaller diameter. J are steel pieces, made to fit the holes in the discs
HI. The part fitted in H is called the "hammer" and the part fitted in I is
called the "stem". "Spiral springs K are placed on the stems between the shoulder
of the hammer and the disc I to press the hammer toward the front of the
machine. On each hammer are fitted two friction rollers one of which L bears
against a cam M, and the other N fits into the grooves e at the periphery of the
disc H thus allowing the hammer to move backward and forward but preventing
its rotation on its own axis. The cam M is a cylinder (the shaft F passing through
its centre) and it is fastened to the inner side of the front end of frame B. Its
edge; against which the rollers L are pressed is cut in the shape of a screw, so that
when a movement of rotation is imparted to the shaft F and the hammers, each
hammer will be pressed back until it has come opposite the upper part of the
machine, when it is relieved from the cam, which allows it to go suddenly forward
under the action of the spring K, and strike the spindle. O which is fitted into a
bearing made to receive it at the front part of the machine. The inner end of O,
is of larger diameter than the body, and at the other end is fitted a block 0¹ made
to receive and hold the drill. P is a gear fitted loosely through a recess in the
frame on the spindle O, said spindle O being provided with a spline, in which fits
a corresponding feather to gear P thus providing for the forward and backward
movement of the spindle while still causing it to revolve with said gear. At the
forward end of the shaft F is keyed a pinion Q, engaging the gear P. The
pinion Q and gear P may preferably have their numbers of teeth in proportion of
one to two. When the shaft F is made to revolve by means of crank R of wheel G
the hammers J passing through the discs H, I, upon said shaft are revolved and the
hammers are pressed back against the springs K by the cam M against which the
rollers L impinge, so that each one in its turn will come opposite and strike the
spindle O, at the same time pinion Q causes the gear P and consequently the
spindle O to revolve. This causes the rotation of the drill. By this construction
a steady rotation is obtained combined with the blows upon the drill thus keeping
the point constantly cutting into the rock. A high rate of speed may be obtained
as the hammers may be brought into position rapidly and the blows delivered
upon the continuously revolving drill. When the point of the drill is made to
bear against the rock; the combined effect of the blows and the rotation of the
drill causes the latter to perforate the rock. The point of the drill is kept in
contact with the rock as it progresses, by means of the hand-wheel D, screw C
and nut E, the bed plate A having been previously placed and fastened in its
proper position.
Referring in the next instance to the several figures from 5 to 11 inclusive.
A is a tubular box made to open on its top side nearly throughout its length, as
shown in Figures 8 and 10, and closed by a cover B' hinged on its one side as
at 61 and engaging with the latch c on its opposite side. This cover protects the
internal part of the machine from dust and flying fragments of rock, or injury
from other causes. At the front end of the machine is secured by means of bolts,
a flange, on which is cast the cam C¹ that lifts the hammers, and that has a central
hub di bored to receive the journal of the central shaft D'. The rear end of this
Shaft D' rests in a step bearing e¹ cast with the box A¹ and near said bearing is a
bevel wheel E' fast on the shaft D G G₁ are the hammers arranged at equal
distances from each other, around and parallel with the shaft D' and at uniform

page_text: distances from the said shaft. These hammers are carried by and are free to slide
within or through the discs or flanges H¹ I' fast on the shaft D', whereby on the
rotation of the shaft D' the series of hammers rotate with it about a common
centre and are guided in their longitudinal movements, springs J' as before serving
to press the hammers forward. Each hammer is restrained from rotating about its
own axis by means of a roller f¹ on it arranged to travel in a slot in the flanges H¹
and each hammer G' has another roller g¹ on it, which bears by the pressure of the
spring Jagainst the stationary cam C', which is of suitable construction on its face to
cause each hammer in succession as the series of hammers are revolved in concert
with the shaft D' to be suddenly and forcibly thrown forward by its spring J',
and deliver its blow on the rear end of the drill spindle K' which carries on its
forward end, by means of a connecting clamp, the drill h¹ and which has a leather
or other soft or elastic washer i¹ interposed between a flange k¹ on said spindle,
and the forward end of the main frame or box secured thereto. The drill is
rotated while the blow is being imparted to it, and is kept constantly rotating by
means of a pinion on the central rotating shaft, D¹ arranged to gear with the
wheel m¹ on the drill spindle. Near the rear end of the box A' and cast at right
angles with it is a sleeve L¹ that receives within it a shaft M¹ to which is secured
a bevel wheel F¹, that gears with bevel wheel E¹ on the shaft D¹. The inner end
of the shaft M¹ rests in a step bearing n¹ cast with the box A¹. A fly wheel N¹
having a crank handle O' is keyed on the outer end of the shaft M'. On what
may be termed the "under" part of the box A¹ extending throughout its length,
is cast a. V shaped slide P which is planed to fit correspondingly shaped grooves
or recesses in a right angularly shaped support Q', to provide for the passage of
the slide P¹ through said support. Under or along one side of the box. A' and
parallel with the shaft D' is a screw R' arranged to rotate in bearings provided
for it in the ends of said box, but restrained by suitable collars on it from longi-
tudinal movement. This screw R¹ works through a nut on the support Q. On
the outer end of the screw R¹ is keyed a handle or hand wheel 8¹ for operating it,
and on the opposite or inner end of said screw is fitted a loose pinion t¹ and a
sliding clutch or sleeve u¹ which is constructed to engage with and disengage from
said pinion, according to the direction in which the sleeve is slid upon the smooth
inner end portion of the screw R. The sleeve u' is fitted to turn with the screw R¹
as well as to slide independently along it by means of an internally projecting pin
on the sleeve arranged to pass through a longitudinal slot in the screw as shown
in Figures 5 and 7 or said sleeve may be otherwise equivalently fitted. When the
sleeve u is pushed against the pinion t¹ said pinion cannot turn without imparting
the same motion to the sleeve, but when said sleeve is drawn away from said
pinion, the motion of both are independent. The sleeve u' has a circular groove
in or around it for the purpose of receiving the end of a lever, i, pivoted
intermediately of its length at w¹.
Secured on the drill spindle end of the box A¹ or flanged thereon, is a casting or
box S¹ bored to receive the drill spindle K' which has a groove cut around an
enlarged portion of it, to receive within it the opposite end of the lever v¹ to that
which engages with the sleeve u. Fastened to the box S¹ is a spring a² which
bears against the lever v¹ to push the spindle K' forward, and at the same time to
press the sleeve u¹ against and into clutch-connection with the pinion t'. The
wheel m¹on the head of the drill spindle is fitted thereto by a spline or feather, so
that said spindle can be made to move back and forth independently of the wheel m¹
but is necessitated to rotate with it. An intermediate gear wheel b³ connects the
pinion on the shaft D' with the pinion on the screw R. The box S¹ is
constructed to cover all the front gearing, thus protecting it from injury. The
slide seat or support Q is secured by a swivel bolt d², to a split sleeve A³, which is
fitted to slide up and down or along a column B2 and is made capable of turning
thereon to adapt the drill to different positions of working, and when the machine
has been thus adjusted as required it is held in position by a screw bolt c³ applied
to the split portion of the sleeve.

page_text: In operating the drill rotary motion is imparted to the fly wheel N¹ and is
transmitted through the bevel gears E' F' to the shaft D¹ whereby and through
the agency of the flanges H¹ I, springs J' and stationary cam C₁ the hammers
rotating in common with the shaft D' but not on their own axes, are made to
successively deliver their blows on the head of the revolving drill spindle K', each
blow being immediately transmitted to the drill point or drill proper h¹. To
prevent the friction which would be caused by contact of each hamner with the
head of the spindle, after the delivery of the blow, and before the hammer is
pushed back again by its travel over the face of the stationary cam C', the spring J'
of each hammer is made of such length, as that it is fully expanded before the
contact of the hammer with the spindle takes place. At the moment of contact
the hammer rebounds as the spring is too short to press it against the spindle and
thus the friction referred to is avoided. The machine can be made to go forward
or backward on its support by suitably turning the hand-wheel 8', and with it the
screw R' working through the nut 7 on the support Q which has a fixed relation.
If, however, the operator is so engaged by working at the crank O¹ of the fly
wheel N as to be unable to use the hand-wheel 81, it is then desirable to so connect
the feed screw R¹ with other parts as to cause the machine to move forward
automatically. To accomplish this the clutch or sleeve u¹ on the end of the screw R¹
is connected by the lever v¹, with the grooved head of the spindle K', which has a
longitudinal movement in its bearing of about three eighths of an inch more or
less, figure 5 showing it in its extreme forward position and figure 7 exhibiting it.
in its extreme backward position. Supposing the parts to be placed as indicated
in Figure 5, and that the point of the drill does not bear against the rock, the
blows of the hammers on the drill spindle will be received by the leather washer
and in this position of the spindle, the sleeve u¹ is pushed into clutch connection
with the pinion t¹. Now, as the pinion t¹ is driven by the wheel 62 which derives
its motion from the pinion on the shaft D', the rotary motion communicated to
said pinion t is transmitted through the sleeve u¹ to the screw R', thus drawing
the machine forward. This forward movement of the machine will continue until
the drill point comes in contact with the rock, and upon the machine being fed
forward faster than the boring is accomplished the drill spindle K₁ will assume the
position shown in figure 7. In that position of said spindle the sleeve u¹ has been
drawn away from the pinion t¹ and said pinion continues to revolve without
affecting the sleeve and screw R¹ consequently the machine remains stationary
until the progress of the boring has again allowed the spindle K¹ to move forward,
and has again caused the sleeve u¹ to connect with the pinion t¹ for the purpose of
automatically feeding the machine forward as before.
By means of the herein before described connection of the support Q¹ with the split
sleeve A made adjustable both along and around the column B2, the machine can
be set, and held in place vertically, horizontally, or at any desired angle, and in
any direction from the axial line of the column as a centre. It will also be noted
that with the addition of the two bevel wheels E¹ F¹, and shaft M¹, arranged in a
line which is parallel with the swivel bolt d², the fly or operating wheel remains
always in a vertical and convenient position for working in the various changed
positions of the machine. It will also be noticed that by means of the step
bearings e¹ and n¹ for the shafts D¹ and M', friction is reduced by causing said
bearings to receive the thrust of said shafts.
In figures 12, 13 and 14 A³ indicates the platform of a rock drill stand mounted
on wheels 63 63 to which, or the front ones of which blocking screws c³ c³ arranged
to pass through the platform and when required to bear down on said wheels are
applied for the purpose of holding the apparatus for rolling or moving away from
the place to which it has been transported for work. Levelling screws d³ d³ may
also be applied to the platform at its opposite end for the purpose of levelling and
steadying the apparatus. Pivoted to said platform at or near its centre by a bolt e³
is an upper swinging base or arm B³ parallel with the upper surface of the platform
and resting thereon. This arm, which is arranged to move over the front half or

page_text: portion of the platform top is held in position either centrally in relation to the
length of the platform or to either side of a longitudinal centre line, by a forward
screw clamp, Cs attached to said arm and bearing against the under side of the
front end of the platform which end is curved with the pivot es as a centre, to
adapt said clamp to it throughout the sweep of the arm. Erected upon the front
or free end of this swinging arm or base B³ within a divided clamping foot
rest f³ thereon is a circulating column D³ of any desired height, and which may be
provided with a jamming screw gs at its top for obtaining a hold for the apparatus
upon the roof of a mine or other place where the drill may be used. E³ indicates
a band rock-drill of any suitable construction. This drill is pivoted by a swivel-
bolt h³ at or about the centre of the length of its frame to one side of a split
sleeve F3 which is constructed to be capable of moving around and up or down the
column Ds and which is clamped or held when so adjusted by a bolt 13. By this
construction of the stand and manner of hanging the rock-drill thereon, the
column D³ with its attached drill E³ may be adjusted from the central position in
which it is shown either to the right or to the left by means of the swinging arm
or base Bs and be secured when so adjusted by the clamp C3 and the drill E³ may
have its working position still further changed by adjusting the sleeve F³ up or
down or around the column D3 and by rocking to any desired angle or position the
drill frame on its swivel bolt h³ and afterwards securing it as required. Such
varied adjustments provide in a very simple and effective manner for arranging
the drill to work in all necessary directions and at different points without moving
the platform, which latter may be levelled and held from moving as herein before
described. When the drill or the column which carries it is adjusted by the
swinging arm B³ into a central position relatively to the length of the platform the
apparatus will be balanced so far as any tendency it might have to tilt or tip over
sidewise is concerned, and the drill will be brought within compass of the platform
thereby facilitating transportation. Apart from the various adjustments which the
construction of the stand and manner of attaching the drill affords every facility
is provided by means of the adjustable clamping foot-rest f³ split sleeve F³; and
swivel bolt h³ for dismembering the apparatus, including the column D³ when
required.
Having described the nature of the said Invention and the manner of performing
the same I declare that what I claim as the Invention to be protected by the
hereinbefore in part recited Letters Patent is:
1st In a hand rock drill, having a frame B, and a drill and drill holding spindle O,
the combination and arrangement of the series of hammers J, with their rollers L, N,
and operating springs K, the discs H, I, driving shaft F, with its crank wheel G
and cam M, substantially for the purpose, and as herein described with reference
to figures 1, 2, 3 and 4, of the drawings.
2nd The bed plate A frame B, adjustable thereon by means of screw C and
nut E, hammers J, rollers L, N on the shafts of said hammers, springs K, discs H, I,
carrying the hammers, shaft F, and wheel G, drill holding spindle with its drill, the
feathered gear P, pinion Q and the cam M operating to retract the hammers, all in
combination substantially as and for the purpose set forth.
3rd In a hand rock drill, the drill holding spindle O, in combination with the
revolving power shaft F, a series of parallel hammers connected with and revolved
by said shaft to bring each hammer successively in line with the drill holding
spindles, a mechanism for discharging each hammer thereon when in line, and, a
mechanism connected with the power shaft F, and the drill holding spindle for
imparting a continuous revolution to said drill holding spindle substantially as and
for the purpose herein described.
4th In a hand rock drill, the drill holding spindle O, and the means for imparting
continuous revolution to it, consisting of the feathered ratchet P, pinion Q, and
power shaft F, in combination with the series of parallel hammers J, connected
with and revolved by the power shaft F, and a mechanism for discharging each

page_text: hammer as it is brought in line with the drill holding spindlė, all arranged and
operating substantially as herein set forth.
5th In a rock drill the combination with a slotted sliding sleeve u¹ and slotted
spindle K connected by a middle pivoted lever vl, of a spring a² arranged to act
upon one arm of the lever, and simultaneously force the spindle down and the
sleeve up as and for the purpose specified and herein described with reference to.
the several figures of the drawings from 5 to 11 inclusive.
6th The combination of the rotating and sliding drill spindle K' the longitudinal
sliding hammers G³, and their springs J¹, the rotating shaft D₁ by which the
longitudinally sliding hammers are made to rotate around the axis of said shaft,
the gears l, m, 62 and loose pinion t¹ the screw R¹ by which the sliding box
or frame portion A¹ of the machine is fed forward, and on which the loose pinion t¹
is arranged the longitudinally sliding sleeve, or clutch u fitted to.rotate in common
with said screw, and engaging with the pinion t¹, the lever v¹, and the spring a²,
essentially as and for the purposes described.
7th The screw R¹ having end sleeve u³, the lever v¹, and the spindle K¹ having
a slight longitudinal play in its bearing in combination with a pinion t¹ wheel b
and pinion on shaft D whereby the machine will be moved forward until the
drill comes in contact with the rock as described.
8th The combination with the rock, drill platform As and the supporting
wheels b8 63 of the blocking screws c³ ³ working through the platform against the
wheels essentially as and for the purpose specified and herein described with
reference to the figures 12, 13 and 14 of the drawings.
9th The combination with the platform A³ of the arm B³ pivoted thereto at or
near its centre parallel with the upper surface thereof and adapted to move over
the front half of said platform top, and a screw clamp C³ attached to said arm
bearing against the front end of the platform at the under side and curved with
the pivot eas and for the purpose set forth.
10th The combination with the column carrying the rock drill of the divided
clamping foot rest f³, the arm or base B3 and the jamming screw g³ at the upper
end whereby the rock drill may be firmly held in position as described.
11th The combination of the platform As mounted on wheels b³ the swinging
arn or base B3 the column Ds carried by said base, the sleeve F adjustable along
and around said column, and a rock drill E³ connected with said sleeve on its one
side, by a swivel bolt h³ substantially as specified.
In witness whereof, I the said Alexander Melville Clark have hereunto set my
hand and seal this twelfth day of November A.D. 1883.
A MCT ADIZ