Improvements in Steam Ore Stamps.
Year: 1898

page_text: Date of Application, 2nd Aug., 1898-Accepted, 24th Sept., 1898
COMPLETE SPECIFICATION.
Improvements in Steam Ore Stamps.
I, DAVID COLE, of 650, Elston Avenue, Chicago, Cook County, Illinois, United
States of America, 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:-
-
The object of my invention is to provide a simple, economical and efficient
steam ore stamp; and the invention consists in the features, combinations and
details of construction hereinafter described and claimed.
In the accompanying drawings, Figure 1 is a vertical elevation partly in section
of a double steam ore stamp constructed in accordance with my improvements;
Fig. 2 a longitudinal sectional elevation taken through the center of the apparatus
showing the upper portion of the steam ore stamp constructed in accordance with
my improvements and the ports and passages for the admission and exhaustion of
fluid pressure, the same being drawn in diagrammatic form for the purpose of
clearness, although it will be noted that the passages are clear and do not com-
municate with other passages; and Fig. 3 a cross sectional view taken on the
line 3 of Fig. 1.
My invention relates particularly to that class of steam ore stamps in
which there is one or more cylinders and stamp pistons arranged to be controlled
by the operation of a single admission valve. In this particular class it is usual
to use the controlling valve to admit and exhaust the fluid pressure; and my
invention has for its principal object the providing of a controlling valve to govern
the admission of fluid pressure only, while the stamp piston or pistons in their
operations control the exhaust directly without the intervention of other means.
Other objects of the invention will appear from the following description and an
examination of the drawings.
In constructing a steam ore stamp in accordance with my improvements I make
a frame portion of the desired size, shape and strength adapted to hold the movable
and other parts in operative position and which comprises a base portion A which
contains a mortar B and four pillars or posts a. On these pillars or posts at the
upper ends thereof is mounted the cylinder casing C which in this case has two
fluid pressure cylinders. The cylinders are provided with movable stamp pistons D
and D having stems and projecting downwardly therefrom and provided
with shoes E and E between which and the dies E the material is crushed or
pulverized during the reciprocations of the pistons. The lower part of the cylinder
casing is provided with stuffing boxes F which surround the stamp stems and
prevent the steam or fluid pressure from escaping.
To control the admission of fluid pressure underneath and above the stamp
nistons. directly and expansively. I preferably provide the cylinder casing with a
head G on which is mounted a casing G1 provided with a valve chest a. This valve
chest is provided with a supply pipe o¹ through which is furnished the fluid pres-
sure supply. A single controlling valve H is provided so as to reciprocate in the
valve chest and which is connected by a valve rod h having collars ¹ thereon

page_text: between which the reciprocating valve is grasped. This valve rod projects out of
each end of the valve chest, and inside the valve chest is preferably provided with
two valve pistons H and H2 between which the live steam at high pressure is
admitted so that such piston rod is practically balanced. Each of these valve
pistons is provided with a small longitudinal opening or passage h¹ and /² adapted
to admit a limited supply of fluid pressure behind such pistons or between them
and the valve chest casing in opposition to each other so as to actuate the valve
rod as is more fully hereinafter described.
.
To admit fluid pressure from the valve ohest to the cylinders, a passage I is
provided which leads to the fluid pressure cylinder K below the stamp piston I)
and a second passage I is provided which leads from the valve chest to the same
cylinder but above such piston. A passage I leads from the valve chest to the
same fluid pressure cylinder-as shown in Fig. 2-into position to be covered and
uncovered by the movements of the valve piston ; while the exhaust passage. L
connects directly with both cylinders and is arranged to be covered and uncovered
by the movements of both pistons as will be more fully hereinafter described.
A passage I connects the valve chest with the fluid pressure cylinder K¹
at a point below the piston therein while a passage I connects such cylinder with
the valve chest at a point above the same piston. A passage 15 also connects the
same cylinder K' with the valve chest and is arranged to be covered and uncovered
by means of the valve piston h2 all of which will be more fully hereinafter
described.
The operation of the parts is as follows: The valve rod h, its pistons and slide
valve are arranged to be moved by a hand lever M first to one side and then to the
other. When the valve is in the position shown in Fig. 2 of the drawings high
pressure flows from the valve chest through the passage I below the stamp piston D
and raises the same as shown in Fig. 2. The exhaust passage L is covered as is
also the passage I that leads to the valve piston chamber. Pressure flowing
through the small inlets and h² and acting positively between the piston H¹
and the walls of the valve chamber, the valve rod with its piston and slide valves
are moved to the opposite position from that shown in the figure so as to connect
the cylinder passages I and I¹ by means of the groove in the slide valve. Fluid
pressure then flows through such passages from below the stamp piston D to above
the same where it acts expansively on the stamp piston and on a larger superficial
area so as to force the same downwardly, being assisted by the weight of the parts.
While the actions above described are taking place, the passage I is uncovered
so that high pressure flows through such passage below the stamp piston D¹ and
acts to raise. the same to its upper limit of motion and cover the exhaust port in
such cylinder and the passage 15. When these passages are covered and the stamp
piston D is at its lowest limit of motion it will be seen that the pressure between
the valve piston H' and the walls of the valve casing is allowed to expand
less than between. the walls of the valve casing and the valve piston H2 which
operates the valve pistons and causes the valve rod with its slide valve to return
to the position shown.in Fig. 2. At each reciprocation of each stamp piston fluid
pressure is exhausted. into the exhaust passage L from which it passes into the
outer air.
.
or become
To regulate the amount of travel of the valve rod and its attached parts and
overcome the shock incident to such movement, as well as to provide means for
taking up the wear, cushion stops or buffers N and N¹ are provided and secured
to the piston rod and are composed. of-metal disks and screw threaded' on to
the valve rod and holding both thereon and between them the rubber cushions n².
The valve chest casing is provided with stops Nand N³ which are preferably fixed
to some portion of the valve casing though they may be fixed if desired to the
cylinder head. It will thus be seen that the cushion stops are adjustably secured
to the valve rod so as to regulate its amount of travel as well as compensate for
the wear on the buffers whenever it becomes desirable or necessary.
In the use of mills of this kind it is often observed that some point or points on

page_text: the faces of the shoe or die or both wears faster than other portions making it
desirable and necessary to shift the position of a given point on the faces of such
parts, and to hold them in such position until the uneven wear is compensated for.
In order to accomplish this result I provide the piston stems with key ways or
splines 1, 2, 3, 4, 5, and 6, shown particularly in Fig. 3. These key ways are
of such length as to allow for the reciprocations of the stamp stems and for the
lowering of the cylinder to compensate for the wear upon the shoes or dies. A
frame is provided which carries the guide blocks 7 and 8 and is provided with
two pair of lugs or bosses 9, 10, 11 and 12, between which is removably held the
keys 13 and 14 which enter the desired slots or key ways in the stamp stems.
These keys are held and secured adjustably by means of the set screws 15 and 16.
When it is ascertained that uneven wear has taken place on the shoe or die or
both the key of the stamp carrying such shoe or die is withdrawn and the stamp
with its stem and shoe rotated to a point that will tend to overcome this wear;
the key is re-inserted, and the parts secured in position. The holding of the stem
while the parts are operated in this manner will tend to equalize the wear and is
a decided advantage over a stamp in which the rotation of the parts is accom-
plished in a step by step and automatic manner.
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. In a steam ore stamp, the combination of a cylinder provided with a stamp
piston, the cylinder having passages leading to points above and below the stamp
piston, a controlling valve arranged to connect and disconnect the above named
ports or passages in the cylinder casing so as to admit high pressure below the
stamp piston in the cylinder and an exhaust passage communicating with the
upper part of the cylindrical chamber which forms the low pressure chamber and
so arranged as to be covered by the piston during the outer portion of its upward
stroke and uncovered as the piston follows the lower limit of its stroke and exhaust
the pressure at low pressure, substantially as described.
2. In a steam ore stamp, the combination of a cylinder provided with a recipro-
cating stamp piston and inlet and outlet passages, the outlet of fluid controlled by
the movements of the reciprocating piston, and a controlling valve arranged to
cover and uncover the passages so that high fluid pressure is admitted below the
stamp piston and low pressure above the stamp piston to reciprocate the same, a
valve rod provided with piston mechanism for moving the controlling valve, the
cylinder being provided with passages leading from the cylinder chamber to such
piston mechanism and adapted to be covered and uncovered by such piston me-
chanism, so that the movements of the stamp piston causes the overbalancing of the
valve piston mechanism and shifts the valve from one position to the other, sub-
stantially as described.
3. In a steam ore stamp, the combination of a casing having at least two cylin-
drical fluid pressure cylinders, a stamp piston in each of such chambers, a valve chest
having passages'connecting with each cylinder above and below the stamp pistons, a
controlling valve adapted to cover and uncover connect and disconnect such pas-
sages so as to admit high pressure below the stamp pistons and expansively above
the same to reciprocate the parts, the cylinder casing having an exhaust passage
that connects each of the cylinder chambers with the outer air, the exhaust of fluid
through the same being controlled by the movements of the reciprocating pistons,
a valve piston rod provided with two pistons-one located at each end portion
thereof and having longitudinal openings which connect the high pressure portion
of the valve chest with a space between such piston heads and the valve chest to
admit a limited supply of fluid pressure in connection with passages in the valve
chest and casing which connect with the cylinder chambers and are adapted to he
covered and uncovered by the stamp pistons and which act to over-balance the

page_text: pressure on such valve rod pistons and shift the valve rod from one side to the
other to reciprocate the stamp pistons alternately, substantially as described.
4. In a steam ore stamp, the combination of a cylinder provided with a recipro-
cating piston, a reciprocating controlling valve for admitting and exhausting
steam into and out of the cylinder to operate the piston and provided with a valve
rod projecting out of the valve chest at each end, a cushion buffer collar on each
end of the valve rod, and stop mechanism arranged on a rigid portion of the
machine between the valve chest and the cushion collars, substantially as described.
5. In a steam ore stamp, the combination of a cylinder provided with a recipro-
cating stamp piston provided with a plurality of longitudinal slots or grooves
arranged in alignment and parallel with the motions of the piston, a key removably
secured to a rigid or immovable portion of the machine and adapted to enter one
slot at a time, the whole so arranged that the lateral position of the stamp stem
with its attached parts may be changed by shifting the same and engaging the
key with another groove, substantially as described.
Dated this 2nd day of August 1898.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C.,
Agents for the Applicant.