Improvements in Apparatus for Dressing and Sharpening Rock Drills and the like.
Year: 1898

page_text: Date of Application, 27th July, 1898
Complete Specification Left, 6th Apr., 1899-Accepted, 27th July, 1899
RONAL DECIFICATION.
Improvements in Apparatus for Dressing and Sharpening Rock Drills
and the like.
I, WILLIAM WANLISS, of 43, Ginsburg Buildings, Main Street, Johannesburg,
in the South African Republic, Engineer, do hereby declare the nature of this
invention to be as follows:-
This invention has particular reference to the machine for dressing or sharpen-
ing rock drills, which torms the subject of British Letters Patent No. 25119 dated
9th November 1896, granted to me, but further relates to an improved construc-
tion of dies for use therewith
This invention consists in certain improvements in the constructional details
of the machine, whereby it is rendered more efficient, less complex, and more com-
pact and consequently not so liable to get out of order, and at the same time
inuch cheaper to construct.
As described in the specification and shewn in the drawings of the Letters
Patent previously referred to, the machine is arranged with two (a vertical and a
horizontal) fixed cylinders, the piston rods of which are connected through the
medium of cross heads working in slide bars or guides and links or toggles with
the extremities of the levers operating the die blocks.
In place of these fixed cylinders, I now propose to employ oscillating cylinders,
the piston rods of which are connected to said operating levers direct. The cylin-
der operating the upper vertically moving die is set at a suitable inclination and
capable of oscillating at its lower end on a pin or trunnion carried or supported
by the frame of the machine.
The other cylinder, for working the horizontally moving plunger or sharpening
die, is set approximately horizontally and is capable of oscillating on a similar
supporting pin or trunnion also carried by the machine frame; the piston rod
as before, is connected to the operating lever direct. By this arrangement the
necessity for the use of all cross heads, slide bars and connecting links for trans-
mitting the movement of the piston rods to the operating levers is dispensed with.
In this connection I may mention that I consider the use of piston or other
equilibrium valves preferable to ordinary slide valves for these cylinders, as in
practice I find that piston valves work more easily and rapidly.
The operating levers are each fitted with bearing blocks in which the toggle
joint between the die blocks and levers works. These blocks are fitted with caps
bolted thereto and to the lever for supporting the pins on which the toggle joints
move.
At the front of the apparatus a device for securing the drills is provided, con-
sisting of a saddle provided with a series of pawls travelling on two parallel bars
with ratchet teeth thereon; or, the parallel bars may be cut with a screw thread
in lieu of the ratchet teeth and the saddle fitted with two half nuts for locking
the same in lieu of the pawls.
Should this latter method be adopted, it is advisable that each bar be cut with

page_text: respectively a right and left hand screw thread, as the pressure exerted on the
end of the saddle will then be in a line more or less parallel to the bars.
1, however, prefer to employ the first described, riz: a saddie provided with
a series of pawis working in suitable ratchet teeth cut on the parallel bars, the
reason being that each successive pawl may be made slightly longer (or shorter
as the case may be) than the preceding one so that the saddle may be fixed prac-
tically at any desired point as required by the different lengths of drills to be
operated upon, without any adjustment on the part of the workman, other than,
in the case of short drills, to push the saddle up against the projecting end of the
drill in the case of long drills, the shank of the drill lies in a groove cut in the
saddle; on the drill shank a slight reduced part is formed to provide a shoulder
on which a collar or washer may be placed which in turn bears against the end
of the saddle; for making the reduced part aforementioned suitable dies are pro-
vided on the vertically moving die blocks.
At the end of the saddle, nearest the machine, is fitted a short lever, the end
of which when in position, forms a stop, and when withdrawn, leaves a space
between the end of the drill and the saddle, in the case of short drills; in the
case of long drills, the stop is between the collar or washer above described and
the saddle. This stop will vary in thickness according to the length of stroke
of the punching or sharpening die, and the quantity of steel required to fill the
forming dies when the sharpening die is nearly at the end of its stroke, the object
of this arrangement being to ensure a uniform size of drill.
It is evident that any form of stop other than that attached to a lever may be
employed.
The parallel bars are themselves mounted in the front of the machine in such
a manner as to admit of the securing device being fixed opposite any particular
set of dies.
Arrangements are also provided for blowing away any scales left in the dies.
One arrangement is worked automatically by the lever operating the upper die,
for a certain portion of its return stroke; this levers acts through suitable con-
nections to open a valve interposed between a pipe leading from the steam or air
supply pipe or other convenient source of supply and a pipe leading into a hole
in the die block which is connected with the dies.
A passage is formed below
each die and inclined or directed upwards under the horizontal plunger or
sharpening die, into which the steam or air pipes communicate, so as to remove
the scales. A further arrangement is provided for clearing away the scales,
which comprises a steam or air pipe with nozzles arranged along the front of
the several dies and capable of being operated by means of any suitable hand
valve or cock.
Each of these nozzles is provided with a cock to shut off the steam or air from
blowing into those dies which are not in use.
On each of these nozzles a small oil cup fixed which is kept supplied from
an overhead oil can; the object of this arrangement is when the steam or air is
turned on to blow away the scales, to inject a spray of oil into and over the dies
to keep them constantly lubricated.
Provision is made for cooling the dies by an arrangement operated in a pre-
cisely similar manner to that described for removing the scales, with the differ-
ence, however, that water is in this case introduced through the centre of the
horizontally moving die and then directed upwards through a suitable hole or
passage to the vertically moving dies.
With regard to the dies, whether for sharpening star or chisel bits, I have
designed a special method of constructing the same whereby a larger cutting
surface on the drill bits is provided. The cutting edge of the finished bits
instead of terminating at a point as in the ordinary form, is carried round the
full width of the web. This form gives a greater cutting surface near the cir-
cumference of the drill.
In this machine the shears for cutting broken drills are situated outside the

page_text: frame and are worked from the trunnion of the lever that operates the vertical
dies instead of being attached directly to the vertically moving die blocks, as
in the old machine.
In carrying my invention into effect I beg to state that the machine generally
is the same as that which forms the subject of Letters Patent No. 25,119/96 I
have, however, found that by making certain constructional alterations a simpler
and more effective machine is the result, the details of which differences are as
follows:-
Two blocks are provided for holding the vertically moving dies, a detailed
description of which is given hereinafter.
Another block is also provided as in the old machine for holding the horizon-
tally moving sharpening or plunger die.
The cylinders instead of being fixed as heretofore oscillate on the pins or
trunnions; the piston rods are thus connected direct to the levers. The gripping
device is replaced in my improved machine by a cradle, the details of the con-
struction of which are hereinafter described.
Stops are provided for the cylinder to determine the length of the stroke and
thus prevent damage to the sharpening die as well as the cylinder covers.
In my old machine the cooling device was operated by the drill, whereas in
my improved machine it is operated by a suitable lever.
In my old machine no device for blowing away the scales was provided. This
is now accomplished by two series of steam or air jets blowing into and against
the dies, the first being worked automatically by the above mentioned lever
operating a valve and the latter by the workman by means of an ordinary cock
or valve.
Each jet or nozzle of the series is provided with a cock to shut off the steam
or air as required: each jet or nozzle is further provided with a small oil cup
which is kept supplied from a can. When the steam or air is turned on to blow
away the scales a spray of oil is at the same time injected into and over the dies
thus keeping them constantly lubricated.
Another device is provided for clearing away the scales from, and at the same
time, cooling the dies. This device is similar to the herein before described
arrangement of steam or air jets with the difference, however, that water is em-
ploved in place of steam or air. This is automatically operated by the valve.
A rotary wire brush is adapted to the machine in any convenient manner, so
as to allow the drill, before being sharpened, to be cleaned from scales or the
like.
In my old machine the shears for cutting the ends of broken drills prior to
sharpening the same, were worked directly from the vertically moving die block.
I have, however, found it more convenient to place the shears outside the frame
of the machine, fixing the lower knife to the frame by means of suitable bolts
and brackets and working the upper or moving knife from a pin on the trunnion
of the aforementioned lever.
In place of the grip for holding the drills in my old machine, I now employ
an entirely new device for securing the drills.
Two bars are kept separate from and parallel to one another by suitable dis-
tance pieces. On these bars ratchets are cut. These parallel bars are themselves
capable of sliding in a dovetail groove cut in the front frame of the machine, to
allow them to be adjusted so that their centre line may he opposite any one of
the dies as desired: the bars are supported at the opposite end by a suitable leg
or legs. Two T bolts are provided sliding in a groove cut in the frame to secure
the parallel bars in any position.
A saddle is constructed to slide upon the parallel bars and is provided with
shoes pivoted thereto at one end to which a series of pawls are attached. These
pawls are preferably constructed of different lengths so as to engage the ratchet
teeth at almost any point,

page_text: A suitable lever operated through handles, is provided for raising the shoes
which carry the pawls in order to disengage them from the ratchet teeth to
enable the saddle to be drawn back.
I will now describe an alternative arrangement of the holding device.
The bars instead of being provided with ratchet teeth, are cach cut with a
screw thread. The saddle is in this case fitted with two half nuts, which may
be locked by means of the lever operating the eccentrically mounted spindle
so as to fix the saddle at any desired point on the bars. The bars are preferably
cut respectively with a right and left hand screw so that when pressure is exerted
on the end of the saddle (as occurs during the process of sharpening) there is
no tendency of side movement on the part of the saddle as I find is the case
when each bar is cut with screw threads having the same direction.
In both these arrangements a short lever is pivoted at the end of the saddle
nearest the machine, the end of which when in position, forms a stop or gauge
at the end of the saddle. This stop, as before mentioned, will vary in thickness
according to the length of the stroke of the sharpening die and the quantity of
steel required to fill the forming dies when the sharpening die is nearly at the
end of its stroke; thus: if the sharpening die has a stroke of 1 inch, of which
4inch is taken up to fill the forming dies, then the stop would be inch thick.
In describing the first arrangement of gripping devices for securing the drills
when sharpening, both long and short drills are supposed to be in position.
The end of the short drill bears against the stop gauge. The long drill lies
along a groove formed in the saddle. A collar is provided fitting against the
shoulder of the reduced part which bears against the stop or gauge.
I will now describe the details of the sharpening dies and the drills:
The lower half of the die required for the particular operation and the lower
counterparts of the forming dies are inserted in one of the beforementioned
blocks.
The upper halves of the forming dies are inserted in a precisely similar man-
ner in the other block.
"Pads "
or supplementary dies, are provided formed in two halves, the lower
half of which is inserted in the first mentioned block immediately behind the
forming die, the upper half being fitted in the same relative position on the
upper die of the second block. These " pads or dies are shaped to conform
to any of the sections of drill steel which may be used, and are intended to
preserve the original section of the drill steel up to the point where the bit
commences.
2
The sharpening die is pressed against the drill bit the section of which is star
shape. Drills formed in dies constructed in this manner provide a greater length
of cutting edge around the circumference of the drill i.e. where it is most
required.
Passages are provided so that the water is led through the dies as herein-
before described.
Dies for roughly forming the steel are provided when necessary preparatory
to finishing in the forming dies.
METHOD OF WORKING.
The general working of the machine remains practically unchanged, the dies
being compressed by means of the levers as before; the piston rods are, how-
ever, directly attached to the levers in place of using connecting rods or links
as heretofore, thus simplifying the construction of the machine."
The drill about to be sharpened is inserted between the forming dies carried
in the blocks and pushed up against the sharpening die; the saddle with the
stop in position is then pushed forward until the end of the drill bears against
the stop gauge. The saddle is then fixed in the one case automatically by the
pawls dropping into the ratchets, and in the other case by turning the handle

page_text: operating the eccentric which forces the half nuts up, thus securely locking
the saddle. The stop is then withdrawn by depressing the handle, leaving a cor-
responding space between the end of the drill and the saddle.
The operator then pulls the drill back through the said space, so that its end
bears against the saddle and closes the forming die by admitting steam or air
to the cylinder. Steam or air is then admitted to the cylinder which forces the
plunger or sharpening die with great velocity against the drill at the same time
filling the forming dies thus causing the bit to take the imprint of both the
sharpening and forming dies. The dies are then allowed to return to their nor-
mal position and the finished drill is withdrawn.
By depressing the handle working the lever the pawls are released from the
ratchets thus allowing the saddle to be placed in any position on the parallel
bars to suit the length of the following drill.
This is accomplished in the alternative arrangement by depressing the lever
which causes the eccentric spindle to release the half nuts.
In sharpening a long drill it is undesirable to secure the drill by means of
the saddle pressing against its end, as, owing to the great length of steel, the
pressure of the sharpening die will certainly cause the drill to buckle or bend.
I therefore form a slight reduced part on the drill at any convenient position
around which, before sharpening, a collar or washer is placed.
The drill about to be sharpened is then inserted betwen the dies as before
described and laid in the groove in the saddle.
The saddle is then pushed forward against the collar or washer and the sharpen-
ing proceeded with as before described.
On the return stroke of the levers the valves are opened admitting respectively
water and steam or air through and into the dies. The water cools and the steam
or air removes the scales from the dies, rendering them immediately ready to
sharpen the next drill and so on.
Dated in 07th
TT
1000
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C.,
Agents for the Applicant.
Improvements in Apparatus for Dressing and Sharpening Rock Drills
and the like.
I, WILLIAM WANLISS, of Ginsberg Chambers, Main Street, Johannesburg, South
African Republic, Engineer, 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:-
This invention has particular reference to the machine for dressing or sharpen-
ing rock drills, which forms the subject of Letters Patent in Great Britain and
Ireland granted me under number 25119/96 and dated November 9th, 1896.
The invention consists in certain improvements in the constructional details
of the machine, whereby it is rendered more efficient, less complex, and more com-
pact and consequently not so liable to get out of order, and at the same time
much cheaper to construct.
As described in the specification and shewn in the drawings of the Letters
Patent previously referred to, the machine is arranged with two (a vertical and a

page_text: horizontal) fixed cylinders, the piston rods of which are connected through the
medium of cross heads working in slide bars or guides and links or toggles with
the extremities of the levers operating the die blocks.
In place of these fixed cylinders, I now propose to employ oscillating cylinders,
the piston rods of which are connected to said operating levers direct. The cylin
der operating the upper vertically moving die is set at a suitable inclination and
capable of oscillating at its lower end on a pin or trunnion carried or supported
by the frame of the machine.
The other cylinder, for working the horizontally moving plunger or sharpening
die, is set approximately horizontally and is capable of oscillating on a similar
supporting pin or trunnion also carried by the machine frame; the piston rod
as before, is connected to the operating lever direct. By this arrangement the
necessity for the use of all cross heads, slide bars and connecting links for trans-
mitting the movement of the piston rods to the operating levers is dispensed with.
In this connection I may mention that I consider the use of piston or other
equilibrium valves preferable to ordinary slide valves for these cylinders, as in
practice I find that piston valves work more easily and rapidly.
The operating levers are each fitted with bearing blocks in which the toggle
joints between the die blocks and levers work. These blocks are fitted with caps
bolted thereto and to the lever for supporting the pins on which the toggle joints
move.
At the front of the apparatus a device for securing the drills is provided, con-
sisting of a saddle provided with a series of pawls travelling on two parallel bars
with ratchet teeth thereon: or, the parallel bars may be cut with a screw thread
in lieu of the ratchet teeth and the saddle fitted with two half nuts for locking
the same in lieu of the pawls.
Should this latter method be adopted, it is advisable that each bar be cut with
respectively a right and left hand screw thread, as the pressure exerted on the
end of the saddle will then be in a line more or less parallel to the bars.
I, however, prefer to employ the first described method, viz; a saddle provided
with a series of pawls working in suitable ratchet teeth cut on the parallel bars,
the reason being that each successive pawl may be made slightly longer (or
shorter as the case may be) than the preceding one, so that the saddle may be
fixed practically at
the different
any desired point as required by
lengths of drills to be operated upon, without any adjustment on the
case of short drills, to
part of the workman, other than, in the
push the saddle up against the projecting end of the drill; in the case of long
drills, the shank of the drill lies in a groove cut in the saddle; on the drill shank
a slight cress is formed to provide a shoulder on which a collar or washer may
be placed which in turn bears against the end of the saddle; for making the cress
aforementioned suitable dies are provided on the vertically moving die blocks.
At the end of the saddle, nearest the machine, is fitted a short lever, the end of
which, in the case of short drills, when in position, forms a stop, and when with-
drawn, leaves a space between the end of the drill and the saddle; in the case of
long drills, the stop is between the collar or washer above described and the saddle.
This stop will vary in thickness according to the length of stroke of the punching
or sharpening die, and the quantity of steel required to fill the forming dies when
the sharpening die is nearly at the end of its stroke, the object of this arrange-
ment being to ensure a uniform size of drill.
It is evident that any form of stop other than that attached to a lever may be
employed.
The parallel bars are themselves mounted in the front of the machine in such
a manner as to admit of the securing device being fixed opposite any particular
set of dies.
Arrangements are also provided for blowing away any scales left in the dies.
One arrangement is worked automatically by the lever operating the upper die
for a certain portion of its return stroke; this levers acts through suitable con

page_text: nections to open a valve interposed between a pipe leading from the steam or air
supply pipe or other convenient source of supply and a pipe leading into a hole
in the die block which is connected with the dies. A passage is formed below
cach die and inclined or directed upwards under the horizontal plunger or
sharpening die, into which the steam or air pipes communicate, so as to remove
the scales. A further arrangement is provided for clearing away the scales,
which comprises a steam or air pipe with nozzles arranged along the front of
the several dies and capable of being operated by means of any suitable hand
valve or cock.
Each of these nozzles is provided with a cock to shut off the steam or air from
blowing into those dies which are not in use.
On each of these nozzles a small oil cup is fixed which is kept supplied from
an overhead oil can; the object of this arrangement is when the steam or air is
turned on to blow away the scales, to inject a spray of oil into and over the dies
to keep them constantly lubricated.
Provision is made for cooling the dies by an arrangement operated in a pre-
cisely similar manner to that described for removing the scales, with the differ-
ence, however, that water is in this case introduced through the centre of the
horizontally moving die and then directed upwards through a suitable hole or
passage to the vertically moving dies.
In this machine the shears for cutting broken drills are situated outside the
frame and are worked from the trunnion of the lever that operates the vertical
dies instead of being attached directly to the vertically moving die blocks, as
in the old machine.
Referring to the accompanying drawings, I would state that the machine
generally is the same as that which forms the subject of Letters Patent
No. 25119/96. I have, however, found that by making certain constructional
alterations, a simpler and more effective machine is the result, the details of
which differences are hereinafter described.
Of the drawings:-
Figure 1 is a front elevation of a machine embodying my improvements.
Figure 2 is a rear elevation thereof.
Figure 3 is a
side elevation thereof partly in section.
Figure 4 is a side elevation of my improved device for securing the drills in
position.
Figure 5 is a plan view thereof.
Figure 6 is an end elevation thereof.
Figure is a detail view showing the method of securing long drills.
Figures 4 to 7 inclusive are drawn to an enlarged scale.
Figure 8 represents in side elevation an alternate arrangement of the holding
device.
Figure 9 is a plan view thereof.
Figure 10 is an end view thereof.
Only those parts of the machine are lettered which are directly affected by
the alterations and improvements aforementioned.
EE are the blocks for holding the vertically moving dies.
Fis the block as in the old machine for holding the horizontally moving
sharpening or plunger die G.
The cylinders C C¹ instead of being fixed as heretofore, oscillate on the pins
or trunnions C2 C3 respectively; the piston rods D1 1 are thus connected direct
to the levers A A¹. The gripping device of my old machine is replaced in my
improved machine by the cradle 0, the details of the construction of which
are hereinafter described.
Stops S S are provided for the cylinder C¹ to determine the length of the
stroke and thus prevent damage to the sharpening die as well as the cylinder
covers.

page_text: In my old machine the cooling device was operated by the drill, whereas in
my improved machine it is operated by the lever A.
In my old machine no device for blowing away the scales was provided. This
is now accomplished by two series of steam or air jets P and blowing into
and against the dies, the first being worked automatically by the lever A opera-
ting the valve at 1" and the latter by the workman by means of an ordinary
cock or valve as at Q.
Each jet or nozzle of the series Q is provided with a cock Q to shut off the
steam or air as required; eacli jet or nozzle is further provided with a small oil
cup Q3 which is kept supplied from the can Q. When the steam or air is
turned on to blow away the scales a spray of oil is at the same time injected
into and over the dies thus keeping them constantly lubricated.
Another device R is provided for clearing away the scales from, and at the
same time, cooling the dies. This device is similar to the herein before described
arrangement of steam or air jets P with the difference, however, that water
is employed in place of steam or air. This is automatically operated by the
valve R¹.
A rotary wire brush is adapted to the machine in any convenient manner, so
as to allow the drill, before being sharpened, to be cleaned from scales etc. This
is not shewn in the drawings as its application in no wise novel.
In my old machine the shears for cutting the ends of broken drills prior to
sharpening the same, were worked directly from the vertically moving die
block E¹. I have, however, found it more convenient to place the shears out-
side the frame of the machine, fixing the lower knife to the frame by means of
suitable bolts and brackets as at 1 and working the upper or moving knife
from a pin on the trunnion of the lever A, as at D, Fig. 1.
In place of the grip for holding the drills in my old machine, I now employ
an entirely new device for securing the drills. An enlarged view of this
device is shewn in Figures 4, 5, 6, and 7 of the accompanying drawings.
Two bars a a are kept separate from and parallel to one another by suitable
distance pieces as at 66 (Fig. 5). On these bars ratchet teeth ecc are cut.
These parallel bars are themselves capable of sliding in a dove tail groove m
cut in the front frame B of the machine, to allow them to be adjusted so that
their centre line may be opposite any one of the dies as desired; the bars a a
are supported at the opposite end by a suitable leg or legs o; the dovetail at
the end of the parallel bars is shewn at d (Fig. 4). nn are two T bolts sliding
in a groove cut in the frame 33 to secure the parallel bars aa in any position.
A saddle e is constructed to slide upon the parallel bars a a and is provided
with shoes ff pivoted thereto at one end (as at y) to which a series of pawls hhh
are attached. These pawls hhh are preferably constructed of different lengths
so as to engage the ratchet teeth ccc at almost any point.
A suitable lever operated through the handles l, is provided for raising the
shoes ff which carry the pawls hhh in order to disengage them from the rat-
chet teeth ccc to enable the saddle e to be drawn back.
An alternative arrangement of the holding device is shewn in Figures 8, 9,
and 10.
The
The bars aa instead of being provided with ratchet teeth, are cach cut with
a screw thread. The saddle e is in this case fitted with two half nuts dd, which
may be locked by means of the lever K operating the eccentrically mounted
spindle K so as to fix the saddle at any desired point on the bars a a.
bars aa are preferably cut respectively with a right and left hand screw as
shewn in Fig. 9 so that when pressure is exerted on the end of the saddle (as
occurs during the process of sharpening) there is no tendency of side movement
on the part of the saddle as I find is the case when each bar is cut with screw
threads having the same direction.
Referring to Figures 4 to 10 pp is a short lever pivoted at the end of the

page_text: saddle nearest the machine, the end of which, when in position, forms a stop or
gauge at the end of the saddle e. This stop, as before mentioned, will vary in
thickness according to the length of the stroke of the sharpening die and the
quantity of steel required to fill the forming dies when the sharpening die is
nearly at the end of its stroke; thus, if the sharpening die has a stroke of 1 inch,
of which inch is taken up to fill the forming dies, then the stop would be
inch thick.
In Figures 4, 5, 6 and 7 q q' are drills shewn in position for sharpening, the
former being a short and the latter a long drill.
The end of the short drill q is shewn bearing against the stop or gauge .
The long drill q¹ lies along a groove formed in the saddle e, as shewn in Fig. 5.
r is a collar fitting against the shoulder of the cress (Fig. 5,) which bears
against the stop or gauge p.
METHOD OF WORKING.
The general working of the machine remains practically unchanged, the dies
being compressed by means of the levers A A' as before; the piston rods are,
however, directly attached to the levers in place of using connecting rods or
links as heretofore, thus simplifying the construction of the machine.
The drill about to be sharpened is inserted between the forming dies carried
in the blocks EE2 and pushed up against the sharpening die G (Figure 3);
the saddle e with the stop p in position is then pushed forward until the end
of the drill bears against the stop or gauge p (Figures 4 to 10 inclusive). The
saddle e is then fixed in the one case (Figures 4, 5, 6, and 7) automatically by
the pawls dropping into the ratchets, and in the other case (Figures 8, 9,
and 10) by turning the handle K operating the eccentric K' which forces the
half nuts dd up, thus securely locking the saddle e. The stop is then
withdrawn by depressing the handle p¹, leaving a corresponding space between
the end of the drill and the saddle e.
The operator then pulls the drill back through the said space, so that its end
bears against the saddle e and closes the forming die by admitting steam or air
to the cylinder C. Steam or air is then admitted to the cylinder which forces
the plunger or sharpening die G (Figure 3) with great velocity against the drill,
at the same time filling the forming dies, thus causing the bit to take the imprint
of both the sharpening and forming dies. The dies are then allowed to return
to their normal position and the finished drill is withdrawn.
By depressing the handle working the lever (Fig. 4) the pawls hh are
released from the ratchets thus allowing the saddle to be placed in any position
on the parallel bars au to suit the length of the following drill.
This is accomplished in the alternative arrangement shewn in Figures 8, 9,
and 10, by depressing the lever K which causes the eccentric spindle K¹ to
release the half nuts dd.
In sharpening a long drill it is undesirable to secure the drill by means of the
saddle e pressing against its end, as, owing to the great length of steel, the pres-
sure of the sharpening die will certainly cause the drill to buckle or bend.
I therefore form a slight cress 1 on the drill at any convenient position around
which, before sharpening, a collar or washer is placed (Figs. 5 and 7).
The drill about to be sharpened is then inserted between the dies as before
described and laid in the groove in the saddle c as shewn at q' Fig. 5 of the
accompanying drawings.
The saddle e is then pushed forward against the collar or washer r, and the
sharpening proceeded with as before described.
On the return stroke of the levers A A' the valves R¹ and PI are opened, admit-
ting respectively water and steam or air through and into the dies. The water
cools and the steam or air removes the scales from the dies, rendering them
immediately ready to sharpen the next drill and so on.

page_text: 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-
In machines for dressing and sharpening rock drills:-
1. Devices for clearing away the scales from and cooling the dies, consisting
respectively, of steam or air and water jets, automatically operated by the levers
working the dies and substantially as herein before described and illustrated on
the accompanying drawings.
2. A device for lubricating and clearing away the scales from the dies consist-
ing of the series Q of steam nozzles, each nozzle being provided with a cock Q
and oil cup Q therefor, substantially as hereinbefore described and illustrated
on the accompanying drawings.
3. A device for securing drills during the process of sharpening, consisting of
a saddle which travels on a pair of adjustable ratchet rods attached to the front
of the machine, the said saddle being secured at any desired position on the
ratchet rods by a series of pawls and provided at its front with a stop or gauge
which is withdrawn when the drill is in position for sharpening in order to
allow the drill to be moved back a corresponding distance before the pressure
of the sharpening die is exerted, substantially as herein before described and
illustrated in Figures 4, 5, 6, and 7 of the accompanying drawings.
4. A device for securing drills during the process of sharpening consisting of
a saddle which travels on a pair of adjustable screw-cut rods attached to the
frame of the machine, the said saddle being secured at any desired position on
the said rods by two half nuts operated by an eccentrically mounted spindle and
provided at its front with a stop or gauge which is withdrawn when the drill is
in position for sharpening in order to allow the drill to be moved back a corres-
ponding distance before the pressure of the sharpening die is exerted, substan-
tially as hereinbefore described and illustrated in Figures 8, 9, and 10 of the
accompanying drawings.
Datad this (ith day of Auril 1899
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C.,
Agents for the Applicant.