Improvements in Machines for Forging and Sharpening Rock and like Drills.
Year: 1896

page_text: Date of Application, 22nd Oct., 1890
Complete Specification Left, 23rd Nov., 1896-Accepted. 24th Dec.. 1896
Date of
1090
Complete Specification Left, 23rd Nov., 1896-Accepted. 24th Dec.. 1896
PROVISIONAL SPECIFICATION.
Improvements in Machines for Forging and Sharpening Rock and
like Drills.
I, FREDERICK GEORGE MYERS, of Box No. 2508 Johannesburg, South
African Republic, Mechanical Engineer, do hereby declare the nature of this
invention to be as follows:-
This invention relates to power driven machines for forging and sharpening
rock and like drills more particularly of the kind generally known as chisel bits.
In one method of carrying out my invention I provide a suitable frame furnished
with a shaft or pivot forming an axis for oscillating levers and jaws and with two
independent crank shafts for operating the levers. The said shafts are preferably
geared together by wheels of different sizes so that one of them turns much faster.
than the other. On the aforesaid pivot two rocking levers are pivoted which
levers work similarly to a pair of shears, the long ends being connected to the
cranks by means of connecting rods. The cranks have different throws so that
the levers move through different distances and by reason of the difference in the
speed of the crank shafts the levers move at different speeds. One of the rocking
levers encircles the pivot near the ends of the latter, and the front and back faces
which are similar, form the lower crushing jaws on which the drill rests. The
other rocking lever encircles the pivot near the centre of the latter and projecting
upwards forms the head carrying the upper jaws which extend correspondingly
over the lower jaws. Both jaws are furnished with suitably shaped removable
cutters by which the drills are sharpened, and other parts of the jaws carry
suitable dies to shape the drill and to size the width of the drill.
The jaws themselves may form the dies if desired.
Since the lower jaws work at a quick speed and rise and fall a comparatively
short distance whilst the upper jaws move slowly but through a greater distance
facility is afforded for inserting the drill between the cutters whereupon the cutters
gradually close until they meet and sever the metal. The flat faces and edges of
the drill are formed and sized by the same method between their corresponding
parts of the jaws and dies. The rocking levers have as above stated two faces
both of which are shaped and provided with cutters as above described, so that a
double machine is provided on one frame enabling workmen at opposite faces to
operate independently of each other. Stationary rests are provided for the drills
in front of the jaws.
The method of working is as follows, that is to say, the heated end of the bar
steel being pushed longitudinally between the shaping parts of the jaws or dies is
formed or flattened by the jaws or dies to the desired taper shape, the end is then
inserted between the sizing parts of the jaws or dies where it acquires the necessary
size or width and thence is passed between the cutters where it obtains the
necessary bevel forming the cutting edge. The drill is then ready for hardening
and use.
The two rocking levers or jaws may be actuated by mechanism other than that.
hereinbefore described and at any desired speed relatively to one another.
Dated this 22nd day of October 1896.
HASELTINE, LAKE & Co.,
45 Southampton Buildings, London, W.C., Agents for the Applicant.

page_text: Improvements in Machines for Forging and Sharpening Rock and
like Drills.
I, FREDERICK GEORGE MYERS, of Box No. 2508 Johannesburg South
African Republic, Mechanical 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 relates to power driven machines for forging and sharpening rock
and like drills more particularly of the kind generally known as chisel bits, and an
important object of the said invention is to provide for accurately forming and
sharpening such drills expeditiously. According to my said invention the forging
and sharpening of the drills is effected by oscillatory levers and jaws furnished
with suitable dies and cutters.
Referring to the accompanying drawings which illustrate one mode of carrying
my invention into practice,
Figure 1 is a vertical section taken on the line a, a of Figure 2, and
Figure 2 is a vertical section taken on the line y, y, of Figure 1, the con-
necting rods being removed and the rear crank shaft being shewn in a different
position.
Like letters of reference denote corresponding parts in both figures.
A is the frame of the machine, X and Y are oscillatory levers furnished with
long arms B, C and pivoted on a common shaft D carried in suitable bearings in
the frame. The ends of the said levers are shaped to form powerful jaws B' B¹,
one on each side of the pivot shaft. The said jaws carry detachable dies or formers
and cutters, or form of themselves dies or formers as hereinafter described. The
lever Y is made hollow as shown so that the arm B can pass through it. The said
lever Y embraces the pivot shaft D near its ends just inside the bearings of said
shaft. The lever X embraces the pivot shaft at its centre. E, F are crank shafts
journalled in suitable bearings in the frame A and coupled by connecting rods G, H
with the lower ends of the lever arms B, C. The said shafts are geared together
by toothed wheels J, Ji preferably of different sizes so that the shaft F may rotate
much faster than the shaft E. The crank of the shaft E has a longer throw than
that of the shaft F, and hence it will be seen that the upper jaws will oscillate
through a greater distance and more slowly than the lower jaws which will
oscillate rapidly and through a less distance. Facility is thus afforded for
inserting the drills between the cutters. The shaft F is furnished with a
driving pulley or other means by which it is driven from any suitable source of
power.
The jaws carry sets of dies K, K for shaping the flat faces of the drills, other
sets of dies L, L for shaping and sizing the edges of the drills, and sets of
detachable cutters M, M for ensuring the necessary bevel at the cutting edges
of the drills. The dies K, and L may be detachable or they may be formed by
the jaws themselves. N, N are stationary rests for supporting the drills while they
are being operated upon in the machine.
The method of operation is as follows, that is to say, the heated end of a bar of
steel being pushed between the dies K, K the same is thereby flattened and
formed of the desired taper shape; it is then inserted edge upwards between the
dies L, L which operate to size the drill or reduce it to the required width and is
finally passed between the cutters, M, M, where it obtains the necessary bevel
forming the cutting edge.
The drill is then ready for hardening.

page_text: Since the machine is double it is obvious that workmen at opposite faces thereof
can work at the same time independently of each other.
Although I have described a convenient mode of actuating the locking levers and
jaws I desire it to be understood that I do not limit my invention to such mode, as
other modes may be advantageously used without departing from the spirit of my
invention. The upper and lower jaws may work at any desired relative speeds and'
through any desired relative distances.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. A machine having oscillatory pivoted levers constructed with jaws con-
stituting dies or fitted with detachable dies substantially as, and for the purposes,
specified.
2. A machine having oscillatory pivoted levers constructed with jaws con-
stituting dies or fitted with detachable dies the said jaws being provided with
detachable cutters substantially as, and for the purposes, specified.
3. A machine having double faced rocking levers constructed with jaws forming
dies or fitted with detachable dies for the purposes specified.
4. A machine having double faced rocking levers constructed with jaws forming
dies or fitted with detachable dies the said jaws being provided with detachable.
cutters for the purposes specified.
5. A machine constructed substantially as described with reference to the
accompanying drawings and operating as, and for the purposes, specified.
Dated this 23rd day of November 1896.
HASELTINE, LAKE & Co.,
45 Southampton Buildings, London, W.C., Agents for the Applicant.