Improvements in and relating to Rock-drills.
Year: 1899

page_text: Date of Application, 4th Mar., 1899
Complete Specification Left. 4th Dec.. 1899-Accepted. 6th Jan. 1900
Communicated from abroad by RAND DRILL COMPANY, of No. 100, Broadway,
New York, United States of America, Manufacturers.
Improvements in and relating to Rock-drills.
I, HENRY HARRIS LAKE, of the Firm of Haseltine, Lake & Co., Patent Agents,
45, Southampton Buildings, in the County of Middlesex, do hereby declare the
nature of this invention to be as follows:-
My invention relates to rock drills, and consists in the provision of a certain
novel means for holding against accidental displacement the bearing or pivot
pin of the rocker arm which actuates the valve, and in the provision of means
for reducing the wear from friction in these parts to a minimum, and the said
invention has for its objects to hold the bearing or pivot pin by such means as
shall not be liable to derangement or accidental displacement, to provide such
means as shall permit of the ready replacement of the pin, when necessary, by
those skilled in the use of tools, but render it unlikely that those who are un-
skilled shall attempt same, and furthermore to so arrange the parts that the
wearing, if any, shall come upon the pivot pin, and not upon the rocker.
My invention also relates to the slide-ways and guides of the cylinder and
shell of a rock drill and consists in an improved form of guide and improved
means for adjusting the slideways to compensate for wear, and has for its objects
to strengthen yet lighten the parts, to construct the guides of such shape that they
will operate well in the various positions in which the drill may be set, to pre-
vent the accidental displacement of the adjustable portion of the slideways and
to simplify and improve the construction of the parts.
My invention further relates to oiling devices which are adapted to be used
in connection with rock drills to effectively oil the working parts of same in
any position in which the rock drill may be set and consists of an oil casing or
reservoir which is so mounted upon the drill that it may be adjusted according
to the angle at which the drill is set, and when so adjusted will be in communi-
cation with the parts to be lubricated, also in constructing the oiling device so
that it may be readily and easily filled without removal, and which when filled
and adjusted for performing its function will be closed to the atmosphere in
order to exclude dust. Also in the provision of such oil channels and the dis-
tribution of oil in such a manner that the oil shall pass to all the working parts
of the drill, such as the piston, the rocker and the valve before same can escape.
The object of this part of the invention is to perfect the oiling means used in
connection with rock drills, to cause a complete and more thorough circulation
of the oil and to prevent the waste of oil from such oiling means so that the
oiling may be more constant and economical.
My invention further consists of certain details of construction and com; .
bination of parts which will be hereinafter more fully set forth.
In carrying my invention into practice the cylinder of the drill is provided

page_text: with a reciprocating piston having a piston rod, to the opposite end of which
may be secured the drill head. A valve chest and slide valve is provided for
controlling the admission and exhaust of the compressed motive fluid, such as
steam or air, through the ports to and from the cylinder. An intermediate
exhaust chamber, and valve chest are together secured to the cylinder by bolts
and nuts. In the said cylinder is arranged a rocker for operating the slide valve
which rocker is mounted in a cut-away portion of the cylinder, and which passes
through the intermediate exhaust chamber and engages with the valve. When
the piston approaches the limit of its stroke in either direction, shoulders on
the piston rod engaging with projecting portions of the rocker throw the same
in one direction or the other; this reciprocates the valve and controls the passage
of fluid. The rocker is mounted upon a pivot pin which passes through steel
bushings in the cylinder casting. The shank of the pivot pin or bolt is of
uniform diameter, throughout and is provided at one end with a head.
The castings containing the exhaust chamber is provided with a depending
lug which overhangs the head or the pivot pin and which, when in position,
will prevent longitudinal movement of the said pin in one direction, the head
itself limiting the movement in the other direction. The parts are assembled
by dropping the rocker into position in its recess in the cylinder, and then
inserting the pivot pin from the right hand side, (looking towards from the
front end of the cylinder) before the intermediate casting or valve chest are
set in position. When the rocker and pin have been inserted as just stated,
the intermediate casting is slipped over the extension of the rocker with the lug
in front of the bolt head, next the valve is put in position in engagement with
the extension of the rocker, and lastly the valve chest is placed in its position
on the casting and the two parts, the casting and the valve chest, are together
bolted down to the cylinder.
Numerous attempts have been made to provide means for simply and securely
fastening or retaining the rocker pivot pin in position, but hitherto none of the
means have been entirely satisfactory. A bolt with a threaded end, and a
nut or nuts is unsatisfactory, not only for the reason that the nuts are liable to
jar loose and get lost, but also for the reason that should they become screwed
up too far they would lock the pin from turning and cause wear upon the
rocker. Taper pins have been used, and were more or less satisfactory when com-
paratively new, but as they were drawn up to compensate for wear, which would
occur in the casting in which they were always set directly, they would gradually
be brought to such a point that they would jar the rocker. Furthermore, if the
pin were arranged to rotate with the rocker, the taper would cause the pin very
readily to jam in its bearing, besides the danger arising from drawing the pin
too far up when adjusting the same.
If, on the other hand the pin were locked stationary in its position the wear
on the rocker itself would be excessive.
The element of wear in machinery of this kind, which is subjected to extreme
conditions is a serious one, and I have in my present invention reduced the
same to a minimum;
I have provided the cylinder casting, which is likely to be of such material,
as would not make a good bearing for the pivot pin, which bearing bushings
as previously described. In these bushings, the pin is arranged to fit easily.. I
then preferably make the pin a driving fit in the rocker, so that the rocker and
its pivot pin will turn together.
In this way, wear that does occur will occur in the pivot pin and not in the
rocker. The advantage being of course, that the pin is a very much easier. and
less expensive piece to replace than the rocker, furthermore, on account of the
greater length of bearing surface, and the better distribution of same, the said
wear is enormously reduced..
I have also thus provided an extremely simple and efficient means for abso-
lutely retaining the pin against accidental displacement, and also provided

page_text: against the damage likely to ensue from the possibility of the pin being tampered
with by unskilled attendants.
According to the second part of the said invention the cylinder of the drill
is arranged to be mounted upon the shell, to slide longitudinally thereon, and
for this purpose is provided with longitudinally disposed guides.
The said guides are of peculiar formation and shape; in cross section they are
tapered on either side with reference to a straight line drawn through both of
said ribs.
I provide stationary slideways upon which the lower faces of said guides
engage and adjustable slideways with which the upper faces of said guides
engage.
Bolts are fitted to extensions of said stationary slideways, on the shell, pass.
through slotted holes in the adjustable slideways.
The angular faces between the adjustable slideways and the shell, at the
point where they engage with each other; are arranged on a line out of parallel
with an horizontal line and at an angle otherwise than a right angle with the
bolts.
The result of the above will be that upon tightening the bolts a constant
pressure will be exerted to force the stationary slideways inwardly, into more
intimate contact with the faces of the guides. It will also follow as a result
of this construction that the said adjustable slideways cannot get accidentally
out of adjustment by slipping rearwardly consequently upon a blow, or the
jarring action to which they are subjected, as in order to do so they would have
to stretch the said bolts, or unscrew the nuts thereon.
In order to prevent an undue pressure being exerted upon the guides by the
slideways, I have provided spacing pieces between shoulders formed in the
stationary and adjustable slideways.
Said spacing pieces may conveniently consist of a plurality of thin strips of
metal, certain of which may be removed as it is desired to adjust the said slide-
ways to compensate for wear, or such spacing pieces may be of single strips
of metal of predetermined thickness, which may be removed and réplaced by
thinner pieces as such adjustment is desired.
This arrangement and combination of parts enables an extremely delicate
adjustment of the slideways to be made, and to, be absolutely maintained
against the violent concussion and shock to which a rock drill is subjected. Many
and various forms of guides and slideways have been made, and have worked
more or less efficiently when the drill has been in a horizontal or vertical posi-
tion. In some cases it becomes necessary to turn the drill upon its side. An
excessive amount of wear has resulted from this, causing the parts to become
loose, out of adjustment and liable to break. Guides of the form and contour
described will permit the turning of the drill on edge without causing undue
wear upon same or upon the slideways with which they engage as would occur
in the forms in use heretofore.
The use of slotted holes for the adjustment of the slideways, and belts passing
through same at right angles to the engaging faces thereof would render the
said adjustable slideways liable to derangement due to shock. The use of the
angular faces as described without the use of the spacing pieces would render the
slideways liable to bind upon the guides, but the combination of said elements
as described results in an extremely efficient and simple device.
Referring now more particularly to the oiling device I provide a reservoir
or oil casing which consists of an outer shell, and a plug fitted to rotate therein,
and is pivoted or swivelly, mounted on the side of the rock drill by means of a
bolt which bolt passes freely through a hole provided in the outer shell and is
threaded into the rock drill proper. The said plug is preferably tapered and
is provided with an orifice which communicates with the interior core thereof.
The said plug is provided with a square end upon which a wrench may be fitted
to turn the same. The outer shell is fitted with a filling hole and when the plug

page_text: is turned around in the casting one-half a revolution the opening in the plug
will register with said filling hole. While in this position the interior core
of the plug may be filled with oil or other lubricating material. When filled the
plug is again rotated until it is in its former position in which position the hole
registers with a channel. A circular channel is arranged between the casing
and the rock drill; one end of the said channel connects therewith, and with a
second channel which leads from said circular channel to the interior of the
valve chamber of the rock drill.
It will be understood that no matter at what angle the drill is placed, the oil
reservoir may be turned so as to be in a vertical position. By reason of the
circular channel, the oil will at all times be free to flow irrespective of the
angle at which the drill is set, or the relative angle of the oil casing with the
rock drill. The distribution of the oil will be as follows. After leaving the
second channel, the oil will enter the valve chamber at about its centre. It will
then lubricate the central portion of the slide valve. The said oil will then
drop into the central drill chamber and lubricate the sides of the rocker. From
thence it will flow into the cylinder and lubricate the piston. In order to pass
out to the atmosphere it must pass the piston, pass along the admission ports
into the valve chamber again where it will lubricate the rest of the valve and
from thence pass out through the exhaust ports. Before a particle of the oil
can escape it must have passed through the entire path as just described. The
oil is thus fully and economically used, none being allowed to go to waste until
it has performed its full function. By such means not only are all the parts
kept freely and well oiled but a great saving of oil is effected. It is immaterial
at what angle the drill. be set, the oiling device will always be adapted for use
and the constant and even distribution of oil will effect a great saving of the
mechanism.
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1000
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C.,
Agents for the Applicant.
Improvements in and relating to Rock-drills. -
I, HENRY HARRIS LAKE, of the Firm of Haseltine, Lake & Co., Patent Agents,
45, Southampton Buildings, in the County of Middlesex, do hereby declare the
nature of this invention and in what manner the same is to be performed, to be
particularly described and ascertained in and by the following statement:-
1
This invention relates to rock drills, and the first part thereof consists in the
provision of certain novel means for holding, against accidental displacement,
the bearing or pivot pin of the rocker arm which actuates the valve, and in the
provision of means for reducing the wear from friction in these parts to a
minimum, and the said invention has also for its objects to hold the, bearing
or pivot-pin by such means as shall not be liable to derangement or accidental
displacement, to provide such means as shall permit of the ready displacement
of the pin when necessary, by those skilled in the use of tools, but render it
unlikely that those who are unskilled shall attempt same, and furthermore to
so arrange the parts that the wearing, if any shall come upon the pivot pin,
and not upon the rocker.
The second part of this invention relates to oiling devices which are adapted
to be used in connection with rock drills to effectively oil the working parts of

page_text: same in any position in which the drill may be set, and consists in an oil casing
or reservoir which is so mounted upon the drill that it may be adjusted accord-
ing to the angle at which the drill is set, and when so adjusted be in communi-
cation with the parts to be lubricated. The invention further consists in con-
structing the oiling device so that it may be readily and easily filled without
removal, and which when filled and adjusted for performing its function will
be closed to the atmosphere in order to exclude dust. The invention also con-
sists in the provision of such oil channels and the distribution of oil in such a
manner that the oil shall pass to all the working parts of the drill, such as the
piston, the rocker and the valve before same can escape.
The object of this part of the invention is to perfect the oiling means used in
connection with rock drills, to cause a complete and more thorough circulation
of the oil and to prevent the waste of oil from such oiling means so that the
oiling may be more constant and economical.
The third part of this invention relates to improvements in the slideways and
guides of the cylinder and shell of a rock drill and consists in an improved
form of guide and improved means for adjusting the slideways to compensate for
wear.
The object of this part of the invention is to strengthen yet lighten the parts,
to construct the guides of such shape that they will operate well in the various
positions in which the drill may be set, to prevent the accidental displacement
of the adjustable portion of the slideways and to simplify and improve the con-
struction of the parts.
The invention further consists of certain details of construction and combina-
tion of parts which shall hereinafter be more fully set forth.
:
Referring to the drawings, Figure 1 is a central longitudinal section of a
rock drill, embodying the invention.
Figure 2 is a central vertical transverse section of the same.
Figure 3 is a top view of the oiling device and a portion of the rock drill.
Figure 4 is an outside view taken at right angles to Figure 2 of certain
portions of the drill.
Figure 5 is a detail section of the improved oiling device.
Figure 6 is a top view of the shell of the drill having the improved slide-
ways, one of the adjustable slideways being removed and illustrated separately.
Figure is a view illustrating the practical application of the oiling device
when used in connection with a drill set for drilling downwardly.
Similar reference characters designate corresponding parts in all the figures.
Reference character a designates the cylinder, the shell upon which the
cylinder is mounted, and upon which it slides, is the feed screw, d is a recipro- -
cating piston having a suitable piston rod, to the opposite end of which may be
secured the drill head.
designates the valve chest and f the slide valve for controlling the admission
and exhaust of the motive fluid, such as steam or air, to and from the cylinder
and which is moved by its engagement with a rocker or tappet. The said valve
is mounted and adapted to reciprocate in the valve casing or chest 93 hh are
the inlet ports communicating with the common inlet channel and with the
inlet valve h h; - are the admission ports and jj the exhaust ports.
ff designates the intermediate exhaust chamber, and the said exhaust
chamber and valve chest are together secured to the cylinder by bolts and nuts
as shown..
e designates the rocker or tappet which is mounted in a cutaway portion of the
cylinder, and which passes through the intermediate exhaust chamber and
engages with the valve. When the piston approaches the limit of its stroke
in either direction, the shoulders thereon engaging with the extending arms
of the rocker throw the same in one direction or the other; this reciprocates the
valve and controls the passage of fluid. The rocker e is mounted upon the
pivot pin ee, which, passes through steel bushings in the cylinder casting...

page_text: The shank of the pivot pin or bolt is of uniform diameter throughout and is
provided at one end with a suitable head.
Referring now particularly to Figures 2 and 4, it will be seen that the cast-
ing f f is provided with a depending lug I which overhangs the bolt head of
the pivot pin ee and which, when in position, will prevent longitudinal move-
ment of the said pin in one direction, the head itself limiting the movement in
the other direction. The parts are assembled by dropping the rocker into
position in its recess in the cylinder, and then inserting the pivot pin from the
right hand side, (looking towards the front end of the cylinder) before the inter-
mediate casting f f or valve chest are set in position. When the rocker and
pin have been inserted as just stated, the intermediate casting off is slipped
over the extension of the rocker with the lug g g in front of the bolt head, next
the valve is put in position in engagement with the extension of the rocker,
and lastly the valve chest is placed in its position on the casting ff; and the
two parts, the casting ff and the valve chest g, are. together bolted down to
the cylinder.
Numerous attempts have been-made to provide means for simply and securely
fastening or retaining the rocker pivot pin in position, but hitherto none of
the means have been entirely satisfactory. A bolt with a threaded end, and a nut
or nuts is unsatisfactory, not only for the reason that the nuts are liable to
jar loose and get lost, but also for the reason that should they become screwed
up too far they would lock the pin from turning and cause wear upon the.
rocker. Taper pins have been used, and were more or less satisfactory when
comparatively new, but as they were drawn up to compensate for wear, which
would occur in the casting in which they were always set directly they would
gradually be brought to such a point that they would jam the rocker. Further-
more, if the pin were arranged to rotate with the rocker, the taper would cause
the pin very readily to jam in its bearing, besides the danger arising from
drawing the pin too far up when adjusting same.
If, on the other hand the pin were locked stationary in its position the wear
on the rocker itself would be excessive.
The element of wear in machinery of this kind, which is, subjected to extreme
conditions is a serious one, and I have in my present invention reduced same
to a minimum.
I have provided the cylinder casting, which is likely to be of such material,
as would not make a good bearing for the pivot pin, with bearing bushings as
previously described. In these bushings, the pin is arranged to fit easily. I
then preferably make the pin a drive fit in the rocker, so that the rocker and its
pivot pin will turn together.
In this way, wear that does occur will occur in the pivot pin and not in the
rocker. The advantage being of course, that the pin is a very much easier and
less expensive piece to replace than the rocker, furthermore, on account of the
greater length of bearing surface, and the better distribution of same, the said
wear is enormously reduced.
I have also provided and shown an extremely simple and efficient means for
absolutely retaining the pin against accidental displacement, and also provided
against the damage likely to ensue from the possibility of the pin being
tampered with by unskilled attendants.
Referring now more particularly to Figures 2, 3 and 5, reference character k
designates the reservoir or oil casing of the improved oiling device. The said
oil casing consists of an outer shell, and a plug m fitted to rotate therein, and
is pivoted or swivelly mounted on the side of the rock drill by means of a bolt n,
which bolt passes freely through a hole provided in the outer shell, and is
threaded into the rock drill proper as into the casting ff as shown in the
drawings. The said plug is preferably tapered and is provided with an orifice o
which communicates with the interior core thereof. p is a square end with
which the said plug is provided and upon which a wrench may be fitted to turn

page_text: same. is a filling hole in the outer shell 7 and when the plug is turned around
in the casing one-half a revolution from the position in which it is shown in the
drawing, the opening p in the plug will register with said filling hole g. While
in this position the interior core of the plug may be filled with oil or other lubri-
cating material. When filled the plug will be rotated again until it is again
in the position shown in the drawings, in which position the hole a registers
with a channel r. s is a circular channel arranged between the casing and the
rock drill; one end of the said channel r connects therewith and ss is a channel
which leads from said circular channel to the interior of the valve chamber of
the rock drill.
It will be seen that no matter at what angle the drill is placed, see for example
Figure 7, the oil reservoir may be turned so as to be in a vertical position. By
reason of the circular channels, the oil will at all times be free to flow irrespec-
tive of the angle at which the drill is set, or the relative angle of the oil casing
with the rock drill. The distribution of the oil will be as follows. After leaving
the channel ss, the oil will enter the valve chamber at about its centre. It will
then lubricate the central portion of the slide valve. The said oil will then drop
into the central drill chamber and lubricate the sides of the rocker. From
thence it will flow into the cylinder and lubricate the piston. In order to pass
out to the atmosphere it must pass the piston, pass along the admission ports
into the valve chamber again where it will lubricate the rest of the valve and
from thence pass out through the exhaust ports. Before a particle of the oil
can escape it must have passed through the entire path as just described. The
oil is thus fully and economically used, none being allowed to go to waste until
it has performed its full function. By such means not only are all the parts
kept freely and well oiled but a great saving of oil is effected. It is immaterial
at what angle the drill be set, the oiling device will always be adapted for use
and the constant and even distribution of oil will effect a great saving of the
mechanism.
According to the second part of the invention the cylinder of the drill is
arranged to be mounted upon the said shell, to slide longitudinally thereon,
and for this purpose is provided with longitudinally disposed guides t. The
said guides are of peculiar formation and shape: in cross section they are
tapered on either side with reference to a straight line drawn through both of
said ribs. Let a represent such line in the drawing at Figure 2, it will be seen
that the faces of both of the ribs converge to points on such line exterior of the
said ribs.
u-u designate stationary slideways upon which the lower faces of said guides
engage as shown, and are adjustable slideways with which the upper faces
of said guides engage.
10 designate bolts which are fitted to extensions - of said stationary
slideways, on the shell, and y-y designate slotted holes through which the bolts
are arranged to pass in the adjustable slideways.
designate the angular faces between the adjustable slideways, and the
shell, at the point they engage with each other; said angular faces are arranged
on a line out of parallel with the line X of the drawing, and at an angle other-
wise than a right angle with the bolts w.
The result of the above will be that upon tightening the bolts a constant
pressure will be exerted to force the stationary slideways inwardly, into more
intimate contact with the faces of the guides t. "It will also follow as a result of
this construction that the said adjustable slideways cannot get accidentally out
of adjustment by slipping rearwardly consequent upon a blow, or the jarring
action to which they are subjected, as in order to do so they would have to stretch
the said bolts, or unscrew the nuts thereon.
In order to prevent an undue pressure being exerted upon the guides by the
slideways, I have provided spacing pieces aa between shoulders u, ee formed in .
the stationary and adjustable slideways.
Said spacing pieces may conveniently consist of a plurality of thin strips of

page_text: metal, certain of which may be removed as it is desired to adjust the said slide-
ways to compensate for wear, or such spacing pieces may be of single strips of
metal of predetermined thickness, which may be removed and replaced by
thinner pieces as such adjustment is desired.
This arrangement and combination of parts enables an extremely delicate
adjustment of the slideways to be made, and to be absolutely maintained against
the violent concussion and shock to which a rock drill is subjected. Many and
various forms of guides and slideways have been made, and have worked more or
less efficiently when the drill has been in a horizontal or vertical position. In
some cases it becomes necessary to turn the drill upon its side. An excessive
amount of wear has resulted from this, causing the parts to become loose, out
of adjustment and liable to break. Guides of the form and contour described
will permit the turning of the drill on edge without causing undue wear upon
same or upon the slideways with which they engage as would occur, in the forms
in use heretofore.
The use of slotted holes for the adjustment of the slideways, and bolts passing
through same at right angles to the engaging faces - thereof would render the
said adjustable slideways liable to derangement due to shock. The use of the
angular faces as described and shown without the use of the spacing pieces would
render the slideways liable to bind upon the guides, but the combination of
said elements as shown and described results in an extremely efficient and simple
device.
Having now particularly described and ascertained the nature of this invention
and in what manner the same is to be performed, as communicated to me by my
foreign correspondents, I declare that what I claim is:-
1. In a rock drill, a cylindrical pin as a support for the rocker pin, and held
in position by a retaining device or retaining devices which is or are secured
to the rock drill frame but is or are independent of the pin itself.
2. In a rock drill, the combination with the cylinder and the piston arranged
to reciprocate therein, a valve chest and a valve for controlling the supply and
exhaust of the motive fluid to and from the cylinder, of a rocker actuated by
the movement of the piston to control the movement of the valve, a cylindrical
pivot pin upon which said rocker is mounted, and a retaining device, secured
to the frame which carries the rocker and pin, but independent of the pin itself,
whereby longitudinal movement of the pin is prevented, substantially as specified.
3. In a rock drill, the combination, with the cylinder and the piston arranged
to reciprocate therein, a valve chest and a valve for controlling the supply
and exhaust of the motive fluid to and from the cylinder, of a rocker actuated
by the movement of the piston to control the movement of the valve, a cylin-
drical pivot pin upon which said rocker is mounted, and a lug or overhanging
ear upon a portion of the frame of the drill removably secured to that portion
of the frame carrying the rocker arm and pin, said lug being in close proximity
to and adapted to prevent longitudinal movement of the pin, substantially as
specified.
4. In a rock drill the combination with the cylinder and the piston arranged
to reciprocate therein, a valve chest and a valve for controlling the supply
and exhaust of the motive fluid to and from the cylinder, of a rocker actuated
by the movement of the piston to control the movement of the valve, a cylin-
drical pivot pin upon which said rocker is mounted, said pin being provided with
a head or shouldered portion for preventing longitudinal movement in the
direction, and a lug or overhanging ear upon a portion of the frame for prevent-
ing longitudinal movement in the other direction, substantially as specified.
5. In a rock drill, the combination, with the cylinder and the piston arranged
to. reciprocate therein, a valve chest and a valve for controlling the supply and
exhaust of the motive fluid to and from the cylinder, of a rocker mounted in
the cylinder casting, a cylindrical pivot pin upon which said rocker is mounted,

page_text: a head or shouldered portion on the said pivot pin for preventing longitudinal
movement of the pin in one direction, an intermediate chamber between the
cylinder casting and the valve chamber, a lug or overhanging ear upon the
said intermediate chamber adapted to prevent the longitudinal movement of the
pin in the other direction, and means for securing the valve chest, intermediate
chamber, and cylinder together, substantially as specified.
6. In a rock drill the combination with a cylinder, a piston, a valve chamber
and a valve arranged to reciprocate therein and control the admission and exhaust
of the motive fluid to and from the said cylinder, of an oiling device, pivoted
or swivelly mounted upon the side of said rock drill so that it may be set at any
angle relatively thereto, and an oil channel leading to the interior of the valve
chamber and communicating with the oiling device, at any angle the said oiling
device may be set relatively to the rock drill.
7. In a rock drill the combination with a cylinder, a piston, a valve chamber
and a valve arranged to reciprocate therein and control the admission and
exhaust of the motive fluid to and from the said cylinder, of an oil reservoir
pivoted or swivelly mounted upon the side of said rock drill, a circular channel
between said oil reservoir and said rock drill, an oil channel leading from the
said oil reservoir to the said circular channel and another oil channel leading
from the said circular channel to the interior of the valve chamber.
8. The combination with a rock drill comprising a cylinder, a piston, a valve
chamber and a valve arranged to reciprocate therein and control the admission
and exhaust of the motive fluid to and from the said cylinder, of a casing pivoted
or swivelly mounted upon the side of said rock drill, said casing being pro-
vided with a filling hole at the top, a circular channel arranged between said
casing and said rock drill, a hollow plug rotably mounted in said casing, said
plug provided with an orifice adapted to register with said filling hole when
said plug is turned in one direction, a channel connecting with said circular
orifice, and with the interior of said plug, when said plug is turned in the
opposite direction, and a channel leading from the said circular channel to the
interior of the valve chamber.
9. A cylinder for a rock drill having outwardly projecting longitudinal guide
ribs, each of said ribs comprising a portion extending outwardly from the
cylinder and a portion turned backwardly towards the cylinder, the lower portion
of said ribs being free at their inner ends substantially as shown, each of said
ribs having two angular faces which converge towards points on a straight line
drawn through both of said ribs, said guides being adapted to work in corre-
sponding slideways in the shell of the drill.
10. In a rock drill, the combination with a cylinder and guides on said
cylinder composed of longitudinal ribs, which ribs are tapered in cross section,
of a shell having stationary slideways with which the said ribs are adapted to
engage, an adjustable slideway adapted to engage with one of the said ribs,
bolts for attaching said adjustable slideway to said shell, said bolts arranged at
an angle otherwise than a right angle with the connecting faces of the said slide-
way and the shell whereby they shall exert a constant pressure to force the
adjustable slideway inwardly, the holes through which the said bolts pass in the
adjustable slideway having clearance whereby such inwardly adjustment is per-
mitted and means for restraining said adjustable slideway from exerting an
undue pressure upon said guide.
11. In a rock drill the combination with a cylinder and guides on said
cylinder composed of longitudinal ribs, each rib having two angular faces, both
of which converge towards points on a straight line drawn through both of said
ribs, of a shell having stationary slideways upon which the lower faces of said
longitudinal ribs engage, adjustable slideways with which the upper faces of
said ribs are adapted to engage, bolts for attaching said adjustable slideways
to said stationary slideways, said bolts arranged at such an angle with the con-
necting faces of the said slideways that they shall exert a constant pressure to
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page_text: force the adjustable slideways inwardly, and removable spacing pieces for pre-
venting the slideways from exerting an undue pressure upon the guides.
12. In a rock drill the combination with a cylinder and guides on said
cylinder composed of longitudinal ribs, each of said ribs having faces converg-
ing substantially as shown, of a-shell having stationary slideways upon which
the lower faces of said guides engage, adjustable slideways with which the
upper faces of said guides engage; angular faces through which the said
adjustable slideways engage with the sail shell, bolts fitted to said-shell; slotted
holes in said adjustable slideways through which said bolts aré-adapted to pass
ánd removable spacing pieces a a substantially as and for the purpose specified.
Dated this 4th day of December 1899.
HASELTINE, LAKE. & Co.,
45, Southampton Buildings; London; W.C.,
Agents for the Applicant.