IMPROVEMENTS IN ROCK DRILLS
Year: 1884

page_text: I, WILLIAM TEAGUE, Junior of Trevenson, Carn Brea, in the county of
Cornwall, Mining Engineer, do hereby declare the nature of my said invention
for "IMPROVEMENTS IN ROCK DRILLS to be as follows:-
My improvements are applicable to rock drills of the percussive class used either
with steain or compressed air, and consist essentially of the following features.
The end of the piston rod containing the drill or tool is made of greater diameter
than the said rod, and such enlarged end is made solid with and forms part of the
said rod, within the said enlarged end a conical hole is formed to receive the conical
end of the tool or drill, such conical parts being formed to a suitable angle for
retaining the said tool or drill securely in position, without the aid of separate
screws or other parts, as in the ordinary way-In order to remove the tool or drill,
a driftway may be provided through the rod at the end of the conical hole, througli
which a key or cotter may be driven to force out the tool.
As a piston rod having an enlarged end in the manner described could not be
passed through a cover or stuffing box gland of the ordinary description, I form
the cylinder cover and the gland in halves, united by bolts and nuts or other
suitable devices, so that they can be readily removed or placed in position.
In place of securing the stuffing box end cover directly to the cylinder,
I interpose a wrought iron ring between the cover and the cylinder, such wrought
iron ring containing an Indian rubber buffer or cushion through which the piston
rod passes, and should the piston through the carelessness of the attendant,
be permitted to strike such Indian rubber cushion, the said wrought iron ring
would take the strain and would avoid the danger of bursting the cylinder or
injuring the cover.
The pawls to the ratchet wheel which is attached to the end of the fluted rod
for rotating the piston in the usual way, may, if desired be kept in contact with
the teeth of the said ratchet wheel by means of springs formed of Indian Rubber.
The cradle of the machine in which the cylinder slides, by means of the feed
crew in the usual way, is provided with two wrought iron or steel plates or strips,
D017

page_text: one being bolted on each side to keep the cylinder down in its place on the
cradle, and the said strips are adjustable by means of distance pieces, to take up
the wear.
By these improvements, the construction of the cylinder, cradle, and piston is
rendered very safe, simple and strong, the working and wearing parts are easily
and cheaply kept in order or replaced and the machine may without danger be
used and worked by inexperienced persons.
I, WILLIAM TEAGUE, Junior of Trevenson, Carn Brea, in the county of Cornwall;
Mining Engineer do hereby declare the nature of my said invention for "IMPROVE-
MENTS IN ROCK-DRILLS" and in what manner the same is to be performed, to be
particularly described and ascertained in and by the following statement:-
--
My improvements are applicable to rock drills of the percussive class used either
with steam or compressed air and consist essentially of the following features.
The outer end of the piston rod to which the drill or tool is attached is made of
greater diameter than the main portion of the rod, and such enlarged end is made
solid with and forms part of the said rod, such enlarged end is bored out conically.
to receive the similarly coped end of the drill or tool, and the said conical parts are
tapered to such an angle that the said drill or tool is securely retained in the end
of the piston-rod, without requiring the aid of separate screws or other devices, as
usually employed for the said purpose in rock-drills-I prefer to provide a drift-
way cut through the enlarged end of the piston-rod at the end of the aforesaid
conical bore, so that the drill or tool may be readily removed from the piston rod
by driving a taper key or cotter through such drift-way to force out the drill
or tool.
As a piston rod having an enlarged end formed in one piece therewith in the
manner above described, could not be passed through a cylinder cover or stuffing
box gland of the ordinary construction, I form the cylinder cover and the gland in
halves united by bolts and nuts, or other suitable devices, so that they can be
readily removed or placed in position-In place of securing the stuffing-box end-
cover directly to the cylinder, I interpose a wrought iron ring, between the cover
and the cylinder, such wrought iron ring contains a disc of Indian rubber, to
form a buffer or elastic cushion through which the piston-rod passes, and should
the piston through the carelessness of the attendant, be permitted to strike such

page_text: cushion, the said wrought iron ring would take the strain and thus avoid the
danger of bursting the cylinder or injuring the cover.
The pawls to the ratchet wheel, which is attached to the end of the fluted rod
for rotating the piston in the usual way, may, if desired, be kept in contact with
the teeth of the said ratchet wheel, by means of springs formed of Indian rubber.
The cradle of the machine in which the cylinder slides by means of the feed
screw in the usual way, is provided with two wrought iron or steel plates or
strips, one being bolted on each side to keep the cylinder down on its bed in
the cradle, and the said strips are adjustable by means of distance pieces to take
up the wear.
By means of these improvements, the construction of the apparatus is rendered
very safe, simple and strong, the working and wearing parts are easily and cheaply
kept in order, or replaced, and the machine may without danger be used and
worked by inexperienced persons.
In order that my invention may be more clearly understood, I will now proceed
to further and more particularly describe the same by reference to the accompanying
two sheets of drawings, as follows-
The said drawings represent a rock-drill of the percussive class, capable of
being driven by steam or compressed air, and constructed in accordance with
my invention.
Fig. I is a longitudinal elevation partly in section of the cylinder, piston, valve-
box, and cradle.
Fig. 2 is a plan of Fig. L
Fig. 3 is an end elevation of Fig. I through the line Z, Z.
Fig. 4 is an end elevation of the wrought iron ring for Indian rubber cushion.
Fig. 5 is an end elevation of the front cylinder cover.
Fig. 6 is an end elevation of the stuffing box gland.
Fig. 7 is a cross-section of the cradle through the line Y Y in Fig. 1.
The same parts are indicated by the same reference letters throughout the
various figures.
The cylinder as shewn is fitted with a double flat slide-valve, moved by a valve-
piston in a box secured to the back of the cylinder, and the said slide valve moves
in the same direction as the piston and is governed by the steam or air supply from
the ends of the cylinder through suitable ports.
A is the cylinder, fitted with a piston B, the said piston B, piston rod B' and
enlarged end B, are all formed in one solid piece. The end B³ is bored up
conically at B³ to receive the shank of a drill or tool, shewn in dotted lines at C,
a driftway B is provided through the end B³ to enable the tool to be forced out of
the socket by means of a tapered key or cotter; it is found in practice that the
above arrangement not only affords a perfectly secure attachment for the tool, but
it enables a tool to be attached or removed with the utmost rapidity and it
obviates the necessity for screws, cuffs, or other detachable parts, which are apt to
be broken, worn out or lost.
A wrought iron ring D is placed on the front of the cylinder and contains a disc
or washer of Indian rubber E, for the piston to strike against should it be allowed
to travel too far. The said ring D will safely bear the consequent strain without
bursting and save the cylinder and cover from injury, but in the event of it being
broken, it can be easily and cheaply renewed.
The front cylinder cover which also forms the stuffing box, is made in halves, F, F¹
united by bolts F, F and the stuffing box gland is also made in halves H, H',
united by bolts H2, H³, by this means the cover and gland can be placed around
the piston-rod.
The ring D is provided with lugs D1, D2, and the cover with lugs F4, F³, for
attachment to the cylinder by bolts J, J-Lugs are also provided on the stufting-
box and gland for their attachment in the usual way as shown.
The front end of the cylinder, the ring D and the cover F, are all recessed as
shown to cause them to seat accurately in place with each other,

page_text: The cradle K is provided with bearing surfaces K¹, K³, on which the cylinder
slides in the usual way-The cylinder is kept in place thereon by steel or iron
strips L, L'.
The said strips are bolted to the cradle as shewn and distance pieces M, M³, are
interposed to enable the strips L, L, to be adjusted to take up wear.
The said strips are easily re-adjusted and replaced by inexperienced persons.
The necessary feed motion is given to the cylinder by means of a screw N in the
usual way and the cradle is provided with a pivot O for attachment to a tripod or
other desired means of support.
The back end of the cylinder is closed by a cover P, and a fluted rod Q, having
a ratchet wheel Q¹, keyed thereon, is provided to partially rotate the piston at each
stroke in the ordinary way.
The pawls QQ of the said ratchet wheels, are by preference kept in contact
therewith by means of Indian rubber springs Q' Q'
It will be understood that my improvements. can be combined with or are
applicable to any form of rock drill of the percussive class, other than the
particular pattern shown.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim, is
1. The construction of a rock drill of the percussive class having the piston rod
formed with an enlarged end B³ solid therewith and a conical recess B³ therein and
the front cylinder cover and stuffing box and stuffing box gland formed in halves,
substantially as and for the purposes herein described and shewn.
2. The construction of a rock drill of the percussive class having a wrought
iron ring D interposed between the front end of the cylinder and the cylinder cover
to contain an Indian rubber cushion, substantially as and for the purposes herein
described and shewn.
3. The construction of a rock drill of the percussive class having the cylinder
retained in place upon the cradle by means of metal strips L, L', substantially as
and for the purposes herein described and shown.
Dated thin 4th dandomhan 1002

page_text: I, WILLIAM TEAGUE, Junior of Trevenson, Carn Brea, in the county of
Cornwall, Mining Engineer, do hereby declare the nature of my said invention
for "IMPROVEMENTS IN ROCK DRILLS to be as follows:-
My improvements are applicable to rock drills of the percussive class used either
with steam or compressed air, and consist essentially of the following features.
The end of the piston rod containing the drill or tool is made of greater diameter
than the said rod, and such enlarged end is made solid with and forms part of tho
said rod, within the said enlarged end a conical bole is formed to receive the conical
end of the tool or drill, such conical parts being formed to a suitable angle for
retaining the, said tool or drill securely in position, without the aid of separate
screws or other parts, as in the ordinary way-In order to remove the tool or drill,
a driftway may be provided through the rod at the end of the conical hole, through
which a key or cotter may be driven to force out the tool.
As a piston rod having an enlarged end in the manner described could not be
passed through a cover or stuffing box gland of the ordinary description, I forma
the cylinder cover and the gland in halves, united by bolts and nuts or other
suitable devices, so that they can be readily removed or placed in position.
In place of securing the stuffing box end cover directly to the cylinder,
I interpose a wrought iron ring between the cover and the cylinder, such wrought
iron ring containing an Indian rubber buffer or cushion through which the piston
rod passes, and should the piston through the carelessness of the attendant,
be permitted to strike such Indian rubber cushion, the said wrought iron ring
would take the strain and would avoid the danger of bursting the cylinder or
injuring the cover.
The pawls to the ratchet wheel which is attached to the end of the fluted rod
for rotating the piston in the usual way, may, if desired be kept in contact with
the teeth of the said ratchet wheel by means of springs formed of Indian Rubber.
The cradle of the machine in which the cylinder slides, by means of the feed
screw in the usual way, is provided with two wrought iron or steel plates or strips,
one being bolted on each side to keep the cylinder down in its place on the
cradle, and the said strips are adjustable by means of distance pieces, to take up
the wear.
By these improvements, the construction of the cylinder, cradle, and piston is
rendered very safe, simple and strong, the working and wearing parts are easily
and cheaply kept in order or replaced and the machine may without danger be
used and worked by inexperienced persons.
Dated this fourth day of December 1884
AMBROSE MYALL, CE,
Agent for the Applicant.

page_text: I, WILLIAM TEAGUE, Junior of Trevenson, Carn Brea, in the county of Cornwall,
Mining Engineer do hereby declare the nature of my said invention for "IMPROVE-
MENTS IN ROCK-DRILLS" and in what manner the same is to be performed, to bo
particularly described and ascertained in and by the following statement :-
My improvements are applicable to rock drills of the percussive class used either
with steam or compressed air and consist essentially of the following features.
The outer end of the piston rod to which the drill or tool is attached is made of
*greater diameter than the main portion of the rod, and such enlarged end is made
solid with and forms part of the said rod, such enlarged end is bored out conically,
to receive the similarly coned end of the drill or tool, and the said conical parts are
tapered to such an angle that the said drill or tool is securely retained in the end
of the piston-rod, without requiring the aid of separate screws or other devices, as
usually employed for the said purpose in rock-drills-I prefer to provide a drift-
way cut through the enlarged end of the piston-rod at the end of the aforesaid
.conical bore, so that the drill or tool may be readily removed from the piston rod
by driving a taper key or cotter through such drift-way to force out the drill
or tool.
As a piston rod having an enlarged end formed in one piece therewith in the
manner above described, could not be passed through a cylinder cover or stuffing
box gland of the ordinary construction, I form the cylinder cover and the gland in
halves united by bolts and nuts, or other suitable devices, so that they can be
readily removed or placed in position-In place of securing the stuffing-box end-
cover directly to the cylinder, I interpose a wrought iron ring, between the cover
and the cylinder, such wrought iron ring contains a disc of Indian rubber, to form
a buffer or elastic cushion through which the piston-rod passes, and should the
piston through the carelessness of the attendant, be permitted to strike such
cushion, the said wrought iron ring would take the strain and thus avoid the
danger of bursting the cylinder or injuring the cover.
The pawls to the ratchet wheel, which is attached to the end of the fluted rod
for rotating the piston in the usual way, may, if desired, be kept in contact with
the teeth of the said ratchet wheel, by means of springs formed of Indian rubber.
The cradle of the machine in which the cylinder slides by means of the feed
scrow in the usual way, is provided with two wrought iron or steel plates or
strips, one being bolted on each side to keep the cylinder down on its bed in
the cradle, and the said strips are adjustable by means of distance pieces to take
up the wear.
By means of these improvements, the construction of the apparatus is rendered
very safe, simple and strong, the working and wearing parts are easily and cheaply
kept in order, or replaced, and the machine may without danger be used and
worked by inexperienced persons,
In order that my invention may be more clearly understood, I will now proceed
to further and more particularly describe the same by reference to the accompanying
two sheets of drawings, as follows-
The said drawings represent a rock-drill of the percussive class, capable of
being driven by steam or compressed air, and constructed in accordance with
my invention,

page_text: :
Fig. I is a longitudinal sectional elevation of the cylinder, piston, valve-box and
valve, and cradle.
Fig. 2 is a plan of Fig. L
Fig. 3 is an end elevation of Fig. I through the line Z, Z.
Fig. 4 is an end elevation of the wrought iron ring for Indian rubber cushion.
Fig. 5 is an end elevation of the front cylinder cover.
Fig. 6 is an end elevation of the stuffing box gland.
Fig. 7 is a plan of the underside of the valve box when removed from the
cylinder.
Fig. 8 is a longitudinal and Fig. 9. a cross-section of the slide valve.
Fig. 10 is an elevation of the slide valve pistou.
Fig. 11 is a cross-section of the cradle through the line Y Y in Fig. 1.
The same parts are indicated by the same reference letters throughout the
various figures.
The cylinder as shewn is fitted with a double flat slide-valve, moved by a valve-
piston in a box secured to the back of the cylinder, and the said slide valve moves
in the same direction as the piston and is governed by the steam or air supply from
the ends of the cylinder through suitable ports.
A is the cylinder, fitted with a piston B, the piston B, piston rod B¹ and enlarged
end B³, are all formed in one solid piece. The end B³ is bored up conically at B³
to receive the shank of a drill or tool, shewn in dotted lines at C, a driftway B is
provided through the end B' to enable the tool to be forced out of the socket by
means of a tapered key or cotter; it is found in practice that the above arrange-
ment not only affords a perfectly secure attachment for the tool, but it enables a
tool to be attached or removed with the utmost rapidity and it obviates the
necessity for screws, cuffs, or other detachable parts, which are apt to be broken,
worn out or lost.
A wrought iron ring D is placed on the front of the cylinder and contains a disc
or washer of Indian rubber E, for the piston to strike against should it be allowed
to travel too far. The said ring D will safely bear the consequent strain without
bursting and save the cylinder and cover from injury, but in the event of it being
broken, it can be casily and cheaply renewed.
The front cylinder cover which also forms the stuffing box, is made in halves, F, F¹
united by bolts F, FS and the stuffing box gland is also made in halves H, H',
united by bolts H³, H³, by this means the cover and gland can be placed around
the piston-rod.
The ring D is provided with lugs D¹, D³, and the cover with lugs F, F³, for
attachment to the cylinder by bolts J, J-Lugs are also provided on the stuffing-
box and gland for their attachment in the usual way as shewn,
The front end of the cylinder, the ring D and the cover F, are all recessed as
shewn to cause them to seat accurately in place with each other.
The cradle K is provided with bearing surfaces K1, K2, on which the cylinder
slides in the usual way-The cylinder is kept in place thereon by steel or iron
strips L, L'.
The said strips are bolted to the cradle as shewn and distance pieces M, M², are
interposed to enable the strips L, L³, to be adjusted to take up wear.
The said strips are easily re-adjusted and replaced by inexperienced persons.
The necessary feed motion is given to the cylinder by means of a screw N in the
usual way and the cradle is provided with a pivot O for attachment to a tripod or
other desired means of support.
The back end of the cylinder is closed by a cover P, and a fluted rod Q, having
a ratchet wheel Q¹, keyed thereon, is provided to partially rotate the piston at each
stroke in the ordinary way.
The pawls QQ of the said ratchet wheels, are by preference kept in contact
therewith by means of Indian rubber springs QQ.
The arrangement and action of the slide valve, as shewn, is as follows-The
valve R is a flat faced valve with double cavity on the face, it is worked by the

page_text: valve piston S, which is seated upon the valve and kept in place by collars as
shewn.
The ends of the said valve piston work in the circular. ends of the valve box T
and the said ends are closed by covers T₁, T, which are provided with projections
to forms stops to limit the stroke of the valve piston, as shewn.
In the position shewn in the drawing the piston is just ready to commence the
outward stroke. The steam or compressed air enters the valve-box at T³, passes
under the back edge of the valve and through the port U to the cylinder-as
shewn by the arrows.
Before the piston has quite reached the end of.its stroke, as shown by the dotted
lines, it uncovers the port V, which admits the steam or compressed air behind the
valve piston and drives it forward, placing the port U in communication with the
exhaust port U³, and the port U in communication with the valve chest.
The steam or compressed air behind the end T¹ of the valve piston, has meanwhile
escaped through the ports V₁ and V into the annular space around the centre of
the piston, from whence it makes its exit to the atmosphere through the port W in
the wall of the cylinder.
The connection between the ports. V1 V2 and between the similar ports V, V³, is
effected by means of the channels X, X', formed in the underside of the valve box,
as shewn in Fig. 7.
When the piston arrives at the end of its stroke a similar series of operations to
those above described returns the said piston and the valve to the position shewn
in the drawing and the piston is thus kept automatically in constant motion.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim, is
1. The construction of a rock drill of the percussive class having the piston rod
formed with an enlarged end B solid therewith and a conical recess B³ therein and
the front cylinder cover and stuffing box and stufling box gland formed in halves,
substantially as and for the purposes herein described and shewn.
2. The construction of a rock drill of the percussive class having a wrought
iron ring D interposed between the front end of the cylinder and the cylinder cover
to contain an Indian rubber cushion, substantially as and for the purposes herein
described and shewn.
3. The construction of a rock drill of the percussive class having the cylinder
retained in place upon the cradle by means of metal strips L, L', substantially as
and for the purposes herein described and shown.
Dated this Ath dan
100-
AMBROSE MYALL, C.E.,
Agent for the Applicant.