Improvements in Apparatus or Machines for Shaping or Forging and Sharpening Rock Drills and the like.
Year: 1897

page_text: Date of Application, 3rd Aug., 1897-Accepted, 25th Sept., 1897
COMPLETE SPECIFICATION.
Improvements in Apparatus or Machines for Shaping or Forging and
Sharpening Rock Drills and the like.
1, STEPHEN PEARCE QUICK, residing on the property of the Wolhuter Gold
Mining Company Limited, near Johannesburg, in the South African Republic,
l'iman, 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 relates to an apparatus or machine primarily designed for shaping
or forging and sharpening that class of rock or like drills commonly termed
jumpers" or "chisel bits," which are employed for the formation of holes in rock,
stone, et caetera, for blasting operations in gold or other mines. Although
primarily and more particularly designed for this special purpose it will be evident
that the machine may be employed for the forging, shaping and sharpening of
other similar shaped edged tools such as chisels and the like.
It is designed with the object of producing an efficient machine for performing
the several operations requisite to produce a satisfactorily sharpened drill, capable
of being driven at a high speed, and at the same time one of comparatively simple
and consequently cheap construction, and one which if desired will be within the
capacity or complete control of one man.
It consists essentially of a machine constructed with upper and lower die blocks
to the upper one preferably of which a reciprocating motion is imparted through the
medium of a crank or eccentric connecting rod and cross-head or slide working in
slide bars or guides formed on or attached to the framing of the machine, or operated
in any suitable and convenient manner, in or to which die blocks any desired and
convenient number of dies for effecting the sharpening of varying sizes of drills
are sunk or fitted, arranged preferably in two sets, one set for forging or forming
e tapering, flat or angular faces of the drill, and the other set for forging or form-
ing the drill on its slightly spreading sides or edges, the halves of the dies for
forming the tapering of flat faces of the drill sunk in each die block being fitted
with adjustable cutters so disposed or arranged within the die blocks as to impart
the desired bevel to the extremity of the drill and to form the sharp chisel shape
cutting edge thereon when the halves of the dies are brought to coincide, and to
shear off any superfluous metal; and also in the combination with the periphery
of the fly wheel of the machine of an adjustable cutter working in conjunction
with an adjustable normally stationary cutter supported in an extension or pro-
jection of the framing directed towards the periphery of the fly wheel, or in a
bracket affixed thereto, for removing the burr or fine edge or strip of metal
usually left on the cutting edge of the drill after it has been passed through the
dies and thereby to complete the sharpening or formation of the cutting edge on
the drill.
The invention will be further and fully described by aid of the sheet of drawings
hereunto annexed
In these drawings

page_text: Fig. 2, an end elevation of same partly in section and shewing one of the dies for
forming the tapering or angular faces of the drill, the means for adjusting the
cutters constituting that part of each half of the die which imparts the required
bevel to the drill and forms the extreme cutting edge thereon, and also the means
for adjusting the lower die block.
Fig. 3, a transverse sectional elevation of a portion of the upper and lower die
blocks shewing one of the dies sunk therein for forming the tapering or flat
faces of the drill, drawn to an enlarged scale.
Fig. 4, plan of one half of the die and die block shewn in Fig. 3,
Fig. 5, a transverse sectional elevation of a portion of the die blocks shewing
one of the dies sunk therein for forming the slightly spreading sides or edges of
the drill.
Fig. 6, plan of one half of the die and die block shewn in Fig. 5.
A is the preferably cast iron frame of the machine of any suitable construction
anu design, comprising a base a and two standards or pedestals a¹ a³, in which is
journalled the eccentric shaft B, to one extremity of which is keyed or otherwise
attached the driving pulley C, speed cone or fast and loose pulleys, and to the other
the fly wheel D.
On the eccentric shaft B and between its bearings the connecting rod or link E
is mounted, which is connected by means of a pin F, bolt or the like with the cross-
head G working in guides or recesses formed on the inside of the standards a¹ a³.
are studs,, pins or the like screwed through the cross-head into the pin F to
secure same thereto and to prevent its rotation therein. To the front of the
standards a¹a are fixed by means of set screws h h¹ or the like the retaining
plates H¹H forming the front portion of the guides or recesses in which the cross-
head G works.
The underside of the cross-head G is formed with a preferably dovetail recess g,
in which fits a correspondingly shaped projection or piece g¹ formed on the top of
the upper die block H. A wedged shaped key is preferably inserted and
tightly driven in one side between the recess g and the projection g¹ to firmly
secure same therein and to prevent the possibility of its working loose whilst the
machine is running. The upper die block H is by this means firmly connected with
the cross-head G and the requisite reciprocating motion is thereby imparted to it
the rotation of the shaft B.
Within the centre of the base a of the machine frame which is hollowed out to
receive it, is fitted a wedge or block K, formed with an inclined upper surface k
and provided with adjusting screws, studs or bolts for effecting any desired
vertical adjustment of the lower die block through the medium of the wedge K.
The screws, studs or bolts pass in from the exterior of the frame, which is
tapped to receive them, and are provided with lock nuts or other suitable devices
for locking same in position after any required adjustment has been effected..
J is the lower die block fitted within the centre of the base a and resting upon
the adjusting wedge K. It is formed with an inclined under surface correspond-
ing with the inclined upper surface of the wedge K. jare studs or screw
bolts provided with lock nuts, screwed through the base of the frame and abutting
the side of the lower die block on the inside for firmly securing same therein hori-
zontally. Studs or screw bolts j passing through holes formed in the lower die
block J, and through preferably open ended slots formed in the adjusting wedge K
and screwing into the base a of the frame on the inside are provided for securely
bolting the lower die block in position vertically when adjusted.
The upper and lower die blocks H J respectively are shewn in the drawings sunk
with three dies L L L for forming the tapering or angular faces of the drill and
with three corresponding dies M M M for forming the slightly spreading sides
or edges thereof. The machine as thus constructed is capable of accommodating
or forging and sharpening three different sizes of drills.
evident that the capacity of the machine or the number of dies may be increased
It will be perfectly
or decreased as may be desired,

page_text: The
The form and construction of the dies L L L is more clearly shewn in Figs. 2, 3
and 4 of the drawings. In the upper and lower die blocks H J are sunk or fitted
half of the complete die having the form of the drill or tool at its cutting extremity
or to formed that when brought together they form a cavity or recess in the blocks
exactly corresponding with the external shape of the tool at this part.
dies L L L have the surfaces corresponding to the tapering or angular faces of
the drill sunk approximately horizontal or so that the drill when placed between
them to be sharpened receives the full force or blow on its tapering or angular
faces. The upper and lower die blocks are constructed with inclined slots pro-
jecting into or terminating at the inner ends of the dies in which are fitted
preferably hardened steel cutters m m slightly rounded and bevelled to
form the slightly rounded and bevelled cutting edges on the drill and to
shear off any superfluous metal that may be fed or placed between the
dies. The cutters it will be perceived complete the form of or constitute the
innermost portion of the die. The slots are cut, or formed at any desired angle
or inclination according to the bevel required on the edge of the drill or tool. For
the particular purpose for which the machine is designed it is found that the cutting
of the slots at an angle of about 45° is productive of satisfactory results. It will
be evident that the inclination may be varied as may be desired.
For the purpose of setting or effecting any required adjustment of the cutters m m¹
wedges or tapered bolts n n¹ are provided passing through slots o o¹ formed in the
die blocks and intersecting the slots 7 and bearing upon the inner extremities
of the cutters m m'. The wedges n n' are screwed and fitted with nuts by which
they may be drawn forward to adjust the cutters. Stops or rests O are fitted by
set screws or otherwise to the upper die block opposite each of the dies L L¹ L³
or carried the full length of these dies.
.
The form of the dies M M M³ is clearly shewn in Figs. 5 and 6 of the drawings.
These dies are similar to those shewn in Figs. 2, 3 and 4 except that they are sunk
or fitted in the die blocks at right angles thereto or so that the pressure of the upper
block is received upon the slightly spreading sides or edges of the drill to complete
the formation of the drill to the required size or gauge.
On the fly wheel side of the frame of the machine an extension or bracket P is
preferably cast, or formed separate and bolted or otherwise affixed thereto. This
projection or bracket P is formed with a vertical slot pin which is fitted a pre-
ferably hardened steel cutter Q held in position therein by means of straps or
bars q secured in position by means of set screws or the like g³ ³. A screw bolt
or stud passing in through the underside of the bracket P and provided with a
lock nut is employed for effecting the vertical adjustment of the cutter Q. In
the periphery of the fly wheel D a slot d is formed in which is fitted a corresponding
custer R provided with holding and adjusting screw bolts or studs 33. The
cutters QR are so arranged and set that as the fly wheel revolves the cutter R
just passes over the cutter'Q. The cutters are preferably slightly rounded and
bevelled off to correspond with the curvature of the cutting edge of the drill or
tool.
A rest or support formed with notches or recesses in line with the several dies
will preferably be holted or otherwise affixed to the frame of the machine and
a similar rest will also be provided for supporting the stock or shank of the drill
whilst the burr or fine strip of metal is being removed by the cutters Q and R.
In the working of the machine after the requisite adjustment of the several
parts has been effected the drill to be sharpened or the metal from which the drill
is to be formed having been raised to the requisite temperature is placed between
one or other of the dies L L or L³ corresponding to its size and thereby has the
tapering or angular faces of the die imparted to it, the cutting edge being at the same
time formed by the cutters. It is now placed in the corresponding die M M' or M²
as the case may be and is finished on its spreading edges and corners. The drill
is now finally placed in the rest so that the fine strip of metal or burr left by the
dies on the edge of the drill is brought in line with the cutting edge of the lower

page_text: cutter anu the cutter R fixed to the periphery of the fly wheel as it revolves
shears off the burr leaving the drill with a clean sharp cutting edge. The drill
is now tempered and is then ready for use.
Having now particularly described and ascertained the nature of the said in-
vention and in what manner the same is to be performed. I declare that what I
claim is:
-
1. In machines or apparatus for shaping or forging and sharpening rock drills
and the like, the combination of two die blocks in which are sunk or fitted dies
corresponding to the cutting points, surfaces or edges of the tool and in which die
blocks adjustable inclined cutters are fitted or inserted to effect the sharpen-
ing or formation of the extreme cutting edge of the drill simultaneously with the
formation of the tapering or angular faces substantially as described and shewn.
2. In machines or apparatus for shaping or forging and sharpening rock drills
and the like the combination of upper and lower die blocks to the upper one of
which a vertical reciprocating or up and down motion is imparted through the
medium of an eccentric, crank or other suitable device, the lower die block being
adjustable vertically by means of an adjusting wedge or tapered block, each die
block being sunk or fitted with a set or series of dies for effecting the sharpening
of different sizes of drills on their tapering or angular faces said dies being fitted
or provided with adjustable cutters for forming the bevel on the cutting edge of
the drill and for forming the extreme cutting edge thereof simultaneously with
the formation of the angular faces, and with a separate set or series of dies for form-
ing the drill on its slightly spreading sides or edges substantially as described and
shewn.
3. The arrangement or device for removing the burr or fine edge or strip of
metal usually left on the cutting edge of the drill after it has been passed through
the dies comprising the bracket formed on or affixed to the frame of the machine
fitted with an adjustable cutter working in conjunction with an adjustable cutter
arranged within a slot formed in the rim or periphery of the fly wheel substantially
as described and shewn.
4. A machine for shaping or forging and sharpening rock drills and the like
having the several parts constructed and arranged in combination substantially
as described and shewn in the accompanying drawings.
Dated this Tenth day of July 1897.
Witness:
CHAS. OVENDALE,
International Patent Agent,
P. O. Box 3146,
Steytler's Buildings, Johannesburg, S.A.R.
S. P. QUICK.