Improvements in or applicable to Stamp-batteries.
Year: 1892

page_text: Date of Application, 19th Feb, 1892
Complete Specification Left, 19th Nov., 1892-Accepted, 31st Dec., 1892
PROVISIONAL SPECIFICATION.
Improvements in or applicable to Stamp-batteries.
I, CHARLES RALEIGH, of Johannesburg, in the South African Republic,
Milling Engineer, do hereby declare the nature of this invention to be as
follows:
This invention consists of improvements in stamp-batteries or crushing mills for
reducing gold ores and other substances.
a
Stamp-batteries or crushing mills usually comprise a mortar-box containing
number of stamps (frequently five), which are lifted, rotated and dropped by an
equal number of cams, either single or double armed, keyed on a revolving cam-
shaft; the stamps all rotating in the same direction. The ore or substance to be
crushed is fed in at the back of the stamps, and, in the process of being crushed,
travels from the back to the front of the mortar-box. Owing, however, to the
stamps all rotating in the same direction, the ore or other substance is driven
toward one end of the mortar-box; its passage from the, inlet to the outlet being
thereby impeded.
In order to ensure the ore or other substance remaining properly distributed in
the mortar-box during the process of crushing, I make the stamps rotate first in
one direction and then in the other; or, I cause each to rotate in a direction
opposite to that of its neighbour. These two movements may also be combined.
In carrying out my invention, two separate cams, either single or double armed,
may be placed between each pair of stamps. Or, a compound cam (consisting of
two cams, either single or double armed, cast together side by side in one piece),
which, when mounted between two stamps, will cause or enable the stamps to
revolve in opposite directions continuously or alternately, may be used. An extra
cam is necessary if there be an odd number of stamps.
Dated the 18th day of February 1892.
G. G. M. HARDINGHAM,
191, Fleet Street, London, E.C., Chartered Patent Agent.
COMPLETE SPECIFICATION.
Improvements in or applicable to Stamp-batteries.
I, CHARLES RALEIGH, of Johannesburg, in the South African Republic, Milling
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 stamp-batteries or crushing mills for reducing gold ores
and other substances, and consists in certain improvements in the method of and
apparatus for working the stamps.
In the accompanying drawings, Fig. 1 is a front elevation of the upper part of
a stamp-battery constructed according to my invention. Fig. 2 is a side elevation
of the cam-shaft and cams; Fig. 3 being a side elevation of one of the cams.
Fig. 4 is a view similar to Fig. 1, but shewing a modification; Fig. 5 being a side
elevation of one of the cams employed in this arrangement.
Stamp-batteries or crushing mills usually comprise a mortar-box containing a
number of stamps (frequently five), which are lifted, rotated and dropped by an
equal number of cams, either single or double armed, keyed on a revolving cam-
shaft; the stamps all rotating in the same direction. The ore or substance to be
crushed is fed in at the back of the stamps, and, in the process of being crushed,

page_text: travels from the back to the front of the mortar-box. On account of the stamps
all rotating in the same direction, the ore or other substance is driven toward one
end of the mortar-box; its passage from the inlet to the outlet being thereby
impeded. Owing to the same cause, the journals in which the stems work become
worn unequally, and the end-thrust on the cam-shaft is in one direction only,
instead of being alternately in each direction for counteracted.
In order to ensure the ore or other substance remaining properly distributed in
the mortar-box during the process of crushing, and to cause the wear to take place
evenly on the various bearing surfaces, I make the stamps rotate first in one
direction and then in the other; or, I cause each to rotate in a direction opposite
to that of its neighbour. These two movements may also be combined.
Two separate cams, either single or double armed, may be placed between each
pair of stamps. Or, a compound cam (consisting of two cams, either single or
double armed, cast together side by side in one piece), which, when mounted
between two stamps, will cause the stamps to revolve in opposite directions con-
tinuously or alternately, may be used between each pair of stamps.
The stems 1, 2, 3, 4 and 5 pertaining to the five stamps are each provided with
one of the tappets A, B, C, D and E. In Fig. 1, the tappets B, C and D are each
acted upon by compound cams having two arms; the tappets A and E being each
acted upon by one arm of a double cam and by a single cam. In Fig. 4, the
tappets A, B, D and E are each acted upon by compound cams having four arms;
the tappet C being acted upon by a compound cam having two arms.
In Fig. 1, the action of the parts at each revolution of the cam-shaft F is as
follows: The cam a, having iinparted a rotary motion from left to right to the
tappet A and raised it into the highest position, slides off that tappet and allows
the first stamp to fall on the material in the mortar-box. The arm d of the
compound cam d c', having acted in like manner on the tappet D, then releases the
fourth stamp. The arm of the cam ba¹ then drops the second stamp; the arm e
of the cam e d¹ the fifth stamp; and the arm c of the cam cb' the third stamp.
The arm a¹ of the cam ba', having imparted a rotary motion from right to left to
the tappet A of the first stamp, drops that stamp; the arm d¹ of the cam e d¹,
having acted in like manner on the tappet D, then releases the fourth stamp; the
arm of the cam c b¹ the second stamp; the cam e¹ the fifth stamp; and the
arm c¹ of the cam d c¹ the third stamp. Thus the order of fall is 1, 4, 2, 5, 3; and
each stamp is dropped twice and turned in both directions at every revolution of
the cam-shaft F.
The arms a, b, c¹ and d¹ and cam e¹ may have a longer sweep than the arms a, b,
e and d and cam e, or vice versa. This provides for the stamps being turned further
round in one direction than in the other. The same effect may be produced by
Toughening or varying the area of the working surfaces of either set of arms and
cam; thus increasing or decreasing the friction between that set and the
tappets.
In Fig. 4, the action of the parts at each revolution of the cam-shaft F is as
follows: The arm a of the compound cam a b a b', having imparted a rotary
motion from right to left to the tappet A and raised it into the highest position,
slides off that tappet and drops the first stamp. The arm d of the cam de d'e¹,
having acted in like manner on the tappet D, then releases the fourth stamp. The
arm b of the first-named cam, having turned the tappet B from left to right, then
drops the second stamp. The arme of the cam de d'e, having acted in the same
way on the tappet E, drops the fifth stamp, whereupon the arm of the cam c c¹
drops the third stamp. The arm a' then drops the first stamp and the arm & the
fourth stamp, both stamps turning from right to left; the arm b¹ then drops the
second stamp and the arm e' the fifth stamp, both stamps turning from left to right,
whereupon the arm c¹ drops the third stamp.
It will thus be seen that in Fig. 1 the cam a and the arms d, b, e and c turn the
stamps successively from left to right; the arms a', d¹ and b¹, the cam e¹ and the
arm c¹ thereupon coming into operation and turning the stamps successively from

page_text: right to left. In Fig. 4, however, the first and fourth stamps turn continuously in
the same direction, viz., from right to left, whereas the second and fifth stamps turn
continuously from left to right. The third stamp also turns continuously from left
to right; but a cam for acting on the right-hand side of the tappet C, which would
consequently turn the stamp from right to left, may be substituted for the cam cel.
Or, two single cams acting alternately on opposite sides of the tappet C, which
would consequently turn the third stamp first in one direction and then in the other,
may, if preferred, be employed.
The two movements described above with reference to Figs. 1 and 4, may, as
previously stated, be combined, in which case the cams would be set to turn the
tappet A from right to left, the tappet B from left to right, the tappet D from right
to left, the tappet E from left to right, during one half revolution; the tappets A
and D being turned from left to right and the tappets B and E from right to left
during the other half revolution. The tappet C would be turned in either or both
directions.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I claim :-
1. In a stamp-battery or crushing mill for reducing gold ores and other
substances, causing the stamps to rotate first in one direction and then in the other,
substantially as herein described.
2. In a stamp-battery or crushing mill for reducing gold ores and other
substances, causing each stamp to rotate in a direction opposite to that of one or
both of its neighbours, substantially as herein described.
3. For operating the stamps in a stamp-battery or crushing mill, arranging the
cams substantially as described with reference to Fig. 1 of the accompanying
drawings.
4. For operating the stamps in a stamp-battery or crushing mill, arranging the
cams substantially as described with reference to Fig. 4 of the accompanying
drawings.
Dated this 19th day of November 1892.
G. G. M. HARDINGHAM,
191, Fleet Street, London, E.C., Chartered Patent Agent.