Improvements in Apparatus for Forging and Sharpening Rock Drills and the like."
Year: 1897

page_text: Date of Application, 31st Aug., 1897-Accepted, 11th Dec., 1897
COMPLETE SPECIFICATION.
[Communicated from abroad by HARRY CARLYON MCDONALD, of Johannesburg,
in the South African Republic, Mine Captain of the Jumpers Gold Mining
Company Limited.]
66 Improvements in Apparatus for Forging and Sharpening Rock
Drills and the like."
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:-
This invention relates to improvements in apparatus for forging and sharpening
rock drills and the like, being primarily intended for producing "chisel bits",
but may be employed for forging and sharpening other tools as found desirable.
It consists essentially cf a suitably mounted disc provided with spring controlled
arms or hammers pivoted at one extremity on the periphery thereof, which arms
or hammers, as the disc is rotated, beat upon a suitably constructed anvil block,
on which the drill or tool is held for the operation of sharpening; between the
standards of the machine and carried in suitable guides, an anvil block is caused
to rise and fall, by means of a crank or eccentric en the driving shaft, upon an
adjustable spring mounted anvil block, in which blocks are mounted respectively
the correspondent halves of cutters and dies for cutting, rounding and flattening
the drills, when necessary, previous to sharpening the same.
The invention will be more fully described with reference to the accompanying
drawings, in which
Figure 1 is a sido elevation of the machine
Figure 2 a front elevation partly in section
Figure 3 shew sections of the cutters and dies for rounding and flattening
previous to sharpening the drills, the said sections being taken on the lines raz¹¹
and respectively.
Figure 4 is a plan of one of the hammers detached and
Figure 5 is a plan of the shaper anvil.
A disc or wheel W is mounted on a suitable shaft S, carried in bearings, in the
standards or uprights R, R, motion being imparted thereto through the fast and
loose pulleys PP.
On the periphery of the disc W, arms or hammers A A are pivoted at one end
thereof, as at BB, and are controlled by adjustable involute or other springs CD
and thus prevented from centrifugally flying out beyond the desired limit as the
disc is revolved; any number of these hammers may be employed as found
desirable in practice, say 3, 4, 5 or 6 (more or less); slotted guides or links EE
of the arms or
are provided as guards to prevent any lateral movement
hammers AA, and also to control the same in case of emergency should the
springs through any cause become inoperative.
Immediately under the disc W is a shaper anvil F supported on any suitable
foundation or block T, upon which the centrifugal hammers AA beat as the
Pic Sal

page_text: disc is revolved. The sharpening of the drills is accomplished by holding the
bits on the anvil block 1', and thus bringing them under the action of the rapidly
revolving centrifugal hammers AA.
Between the standards RR of the machine, whose inner-faces are planed or
provided with guides, a block y slides, motion being imparted thereto either by
an eccentric or crank on the shaft S working in a cross head Q within the sliding
journal box q. The sliding block g is constructed with a dovetail so that an upper
anvil GG may be readily affixed thereto.
Immediately beneath the upper sliding block is a second block HH mounted
upon involute or other springs KK and capable, of adjustment by means of the
bolts JJ, which on being turned either raise or depress tho block, as the case
may be. LL are bolts on the standards R R, bearing upon the lower block HH,
for the purpose of regulating the amount of play imparted thereto by the
springs KK
The upper and lower anvil blocks GGHH already described are respectively
provided with the corresponding halves of outters ab and dies edef Figure 3 for
the purpose of cutting, rounding, or flattening the drills previous to the operation
of sharpening the same, which as already described, is accomplished by holding
the bits on the anvil I', on which the, centrifugal hammers AA beat.
I wish it to be clearly understood that the machine may be used in its complete:
form as horein described viz:-with the anvil blocks carrying the dies for cutting,
rounding and flattening, together with the disc W carrying the centrifugul
hammers for sharpening the bits; or the last described portion of the invention
may be used by itself, simply, for the purpose of sharpening the bits, the round-
ing and flattening having been otherwise accomplished.
Having now particularly described and ascertained the nature of my said
invention and the manner in which the same is to be performed, I declare what what
I claim is
1. In apparatus for forging and sharpening rock drills or other like tools, in
combination the revolving discs W with the centrifugal arms or hammers AA 3
affixed at one end to the periphery of said disc, the slotted guard links EE, the
adjustable controlling springs CD) to regulate the blow of the centrifugal hammers,
and the fixed anvil F, substantially as described and illustrated in the accompany-
drawings.
2. In apparatus for forging and sharpening reck drills and other like tools, 3
in combination the anvil block H H supported by the springs KK adjustable by
means of the screws JJ and LL, with the rising and falling. anvil block driven
by means of the crank or eccentric on the shaft of the machine, and the cutters ab,
and the dies def, substantially as described and illustrated on the accom-
panying drawings.
:
3. An apparatus for forging and sharpening-rock drills and other like tools
arranged substantially as described and illustrated on the accompanying drawings.
Dated this 30th. day of August, 1897.
4
HASELTINE LAKE & Co.,
45, Southampton Buildings, London, W.C. Agents for the Applicant.