Improvements in connection with the Mounting of Cams for Use in Stamping Machinery.
Year: 1896

page_text: Date of Application, 21st July, 1896
Complete Specification Left, 20th Apr., 1897-Accepted, 22nd May, 1897
PROVISIONAL SPECIFICATION.
Improvements in connection with the Mounting of Cams for Use in
Stamping Machinery.
I, EDWARD JOHN WAY, of Johannesburg, in the South African Republic,
General Manager of The George Goch Amalgamated Gold Mining Company,
Limited, do hereby declare the nature of this invention to be as follows:-
This invention relates to an improved method of constructing and mounting cams
for use in stamping machinery, and consists in rolling or machining the shaft to a
cross section represented by an equi-sided polygon; the ends thereof being turned
cylindrical to fit the bearings. The cams are bored or machined to fit the
polygonal shaft and are secured against longitudinal movement by means of keys
or other appropriate fastening devices.
Where a battery coutains five stamps, I prefer to employ a pentahedral shaft, so
that the cams are readily set at angles of 72° and follow one another in operation
at equal intervals.
Improvements in connection with the Mounting of Cams for Use in
Stamping Machinery.
I, EDWARD JOHN WAY, of Johannesburg in the South African Republic,
General Manager of The George Goch Amalgamated Gold Mining Company,
Limited, 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 the construction of the cams and cam shafts of stamp
mills, or the apparatus employed for the crushing or reduction of auriferous or
other metalliferous ores, preparatory to their treatment to extract the precious or
other metals therefrom.
It is designed with the object of so constructing the parts that the cams can be
quickly and easily removed from the shaft for renewal or repair, as may be
required, and replaced with equal facility, without necessitating the removal or
disturbing of the other cams or mechanism, to enable them to be easily renewed
or repaired, and in case of the fracture of one of the wipers to avoid the necessity
of the renewal of the entire cam.
It consists essentially in constructing the cam shaft of a polygonal (preferably
regular) cross section, the number of sides of which polygonal section is preferably

page_text: equal to an even multiple of the
mortar box, forming the cam in
same to fit the shaft.
number of stamps dropping or working in one
halves, and boring or otherwise constructing the
The invention will be fully described with reference to the accompanying
drawings, in which a cam and cam shaft for a five stamp mill is illustrated,
designed in accordance with my invention, and in which
Fig. 1, shews a side elevation of the cam detached from the shaft.
Fig. 2, a plan of same.
Fig. 3, a longitudinal elevation of the cam shaft.
Fig. 4, a transverse sectional elevation of same.
Fig. 5, a longitudinal elevation of the cam shaft with the five cams in position
thereon.
Fig. 6, end elevation of same.
The cam A as shewn in the drawings (see more particularly Figs. 1 and 2) is
constructed in two parts B and C. The two portions D D¹ of the boss of the cam
are bored or machined of such a shape that when placed together they correspond
with the external shape of the polygonal shaft to which they are to be attached.
In the drawing the cam shaft is shewn of decahedral section, being designed for a
five stamp mill, and the cam is bored accordingly. The parts D D' of the boss are
formed with suitable side lugs d d' which are provided with holes E, for the bolts F
or the like, by which means the halves of the cam are secured together in position
on the shaft. This construction removes all fastening devices clear of the working
faces of the cam. The faces ee of the two parts DD' of the boss, and the
faces of the lugs dd' are preferably planed so as to leave a small amount of
space or clearance at gy or so that when placed together upon the shaft they do
not come into actual contact until pressure is brought to bear by screwing up the
bolts F.
Any suitable and convenient meaus may be adopted for locking the bolts in
position. A packing piece or strip of lead or similar soft metal is preferably
inserted between the faces f' of the lugs before they are tightened up on
the shaft.
Whilst I prefer to form the faces eel and ff at an inclination to each other, as
shewn in the drawings, as this gives a firm grip of the shaft, it will be obvious that
they may be otherwise formed.
The cam shaft G (see Figs. 3 and 4) is rolled or machined of any (preferably
regular) polygonal cross section, the polygon being preferably equal in the number
of its sides to an even multiple of the number of stamps dropping in the mortar
box of the stamp mill for which it is intended. The shaft is turned cylindrical to
form journals at H H' and with a cylindrical or other continuation H2 to which the
driving pulley is keyed or otherwise secured. It will be evident that instead of
the shaft shewing the regular polygonal cross section for the whole of its length
between the journals it may be constructed intermittent or with a series of bosses
or sleeves shewing a regular polygon in cross section to which the cams may
be attached.
If desired or found necessary suitable pins, cotters, keys, collars or the like may
be fitted to or on the shaft to prevent any movement of the cams longitudinally
along the shaft.
The flats or faces ou the shaft materially facilitate the arrangement and setting
of the cams to obtain any desired order of drop of the stamps in the mortar box of
the starop mill.
In this construction of cam and cam shaft all necessity for the cutting of
key-ways or slots which considerably weaken the shaft, and which render the
removal of the cam from the shaft a lengthy and laborious and consequently costly
operation, is also dispensed with, and all the cams being bored exactly alike, in case
of a breakage of one of the wipers the broken portion is readily replaced, whereas
with the ordinary construction a cam with key-way cut in a corresponding position
in the boss to the broken one is required which entails considerable delay.

page_text: In Figs. 5 and 6 a complete shaft is shewn with five cams mounted in position.
thereon to give an order of drop as figured on the drawing.
Although I prefer in the case of a five stamp mill to form the shaft of decahedral
section, and bore the cams correspondingly, it is to be understood that any other
even multiple of the number of stamps may be adopted.
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 cam shaft for stamp mills constructed of a polygonal cross section in
combination with a cam or cams formed in balves and bored and otherwise
constructed to fit said shaft substantially as described and shewn in the
accompanying drawings.
2. A cam shaft for stamp mills constructed of regular polygonal cross section,.
the number of sides of the polygon being equal to an even multiple of the number
of stamps dropping or working in the mortar box, in combination with a number of
cams formed in balves and bored to fit said shaft, substantially as described.
3. A cam shaft and cams for a five stamp mill constructed and arranged
substantially as described and shewn with reference to Figs. 5 and 6 of the
accompanying drawings.
Dated this Seventh day of December 1896