Certain Improvements in Stamp Batteries.
Year: 1890

page_text: Date of Application, 25th Jan., 1890-Accepted, 1st Mar., 1890
COMPLETE SPECIFICATION.
Certain Improvements in Stamp Batteries.
I, MARTIN PRIOR Boss, of No. 309 California Street, in the city and county of
San Francisco, and State of California, one of the United States of America, 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 :-
My invention relates to the class of stamp-batteries or mills; and my invention
consists in the constructions and combinations of devices which I shall hereinafter
fully describe and claim.
Figure 1 is a side elevation of my stamp-battery, some of the parts being broken
away.
Figure 2 is a front elevation of same.
My stamp-battery is of the general type known as "iron-frame batteries."
A is a sole or bed-plate, which is to be firmly secured to a masonry foundation.
B is the iron frame, consisting of four castings in all, to wit: the two side
castings b, the single top casting b', bolted to the top of the side castings, and the
cross-casting 2 bolted to and between the side castings and which forms the guide for
the stamp-stems.
The side castings are bolted down to the sole or bed-plate, preferably with an
intervening piece of wood W, which serves as a cushion.
C is the mortar. This also is bolted down to the sole or bed-plate, and has, preferably,
an intervening cushion of wood w. Thus both the frame and the mortar are bolted
to the sole cr bed-plate and have a connection only through said plate. In the
ordinary form of iron-frame batteries the frame is directly secured to and built up
from the mortar.
The jar of the stamps is, therefore, carried directly to the frame, and there is con.
siderable strain and racking thus put upon it.
The improvement in my construction is that the frame and the mortar are not
directly connected, but are both bolted to the sole-plate, and the jar of the stamps in
the mortar is communicated to the frame indirectly through the sole-plate, and is
thereby materially reduced.
In the frame itself a novelty is to be noted, which results in simplicity of con-
struction, involving a minimum number of parts, thereby reducing the number of
joints and materially increasing the rigidity of the entire structure.
D is the cam-shaft, having the cams d, which operate under the tappets e' of the
stems of the stamps E. The boxes F, in which this cam-shaft is mounted, are
formed directly in and are integral with the side castings of the iron frame. These
boxes are made semi-circular, entrance for the shaft being gained through wide-open
fronts f, made in the castings.
There are no tops for the boxes, the shaft lying directly in them and is held
therein by its own weight and the weight of the stamps on which its cams
operate.
The mortar is provided with the usual side-screen_c. Its top is thus con-
tructed: An inwardly and downwardly extending flange c¹ is formed on its
nner front side, and a short straight flange c² is formed on its inner rear side.
Bolted to the ends of the flanges, top and bottom, are packing-strips 3, which
come up close to the stamps E, said stamps thus working up and down in the space
between the packing-strips, which come up into contact with the stamps and form
uitable protecting-joints therefor.
The advantage of the downwardly-inclined flange c¹, is that it better receives and
irects the splash to the screen, for, on account of its inclination, any pulp striking it
aust rebound directly upon the screen.

page_text: In stamp-mills of this class where the stamps drop only by their own weight
unassisted by any accelerator, they cannot be driven beyond a certain speed, for the
cams will, if rotated too rapidly, catch the tappets before the stamps have delivered
their blow. Accordingly, springs have been used to accelerate the drop of the stamps,
so as to provide for a more rapid operation.
The feature, in this regard, in my battery, lies in the arrangement of the accelerators,
whereby they are adapted to be readily thrown into action or out of use, according as
a more rapid drop or a normal operation is required.
G are brackets secured to the top of frame B. On these are mounted the heavy
springs H, each having, passing through its center, a rod I, with a washer i, and
nut on top, bearing on the top of the spring. The rod passes down through the
bracket G, and its lower end is engaged by a lever J, which is pivoted in lugs g
depending from the bracket.
To the inner end of the lever J, is pivoted an arm K, provided with a pulling-out
rod k. There is a mechanism of this kind for each stamp.
Now, when the arm K is allowed to hang perpendicularly, its lower end lies in the
path of the vertical movement of the stamp-stem tappet e¹, so that as said tappet rises,
it comes in contact with the end of the arm, thereby lifting it.
This movement of the arm through the lever J, and rod I, compresses the spring H,
and as soon as the tappet is relieved of the cam, the spring, expanding and acting
through the rod, lever, and arm, throws the stamp down instantly.
When the accelerating-springs are not required, the arms K are pulled and held out
of the way of the tappets. Thus the springs may be readily called into or thrown out
of action, as required.
To provide a means suitable in all cases for hanging up the stamps, and one easily
operated, I have the following construction :-Mounted in suitable bearings and
transversely of the frame are short rocking eccentrics L, each provided with a hole 1,
into which a bar is to be inserted in order to rock the eccentrics.
M are the hanging-up fingers, the lower ends of which are mounted upon the
eccentrics. The top of each finger has a head m, through which passes a bolt m¹, having
a bearing-plate m² on its top. Under this bearing-plate and resting on the head m
are a number of elastic washers m³, forming a cushion and held in place by the bolt m²,
which is tightened down by a nut m* below.
Now, when a stamp is raised as high as possible on its cam, the finger M, which is
then at its lowest position, is thrown in, so that the cushioned bearing-plate m² of its
top comes under the tappet.
Then the eccentric L, is rocked by the bar-lever inserted in its hole 1, so as to raise
the finger M, and the tappet is thereby raised on the top of said finger and hung up.
The cushioned plate m², relieves the finger of any jar.
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 stamp-battery, the sole-plate, the superposed wooden cushion-plate, the
mortar bolted through the cushion-plate to the sole, and the iron standards upon which
the cam-shaft is journaled, said standards being bolted through the cushion to the
sole-plate independent and separate from the mortar.
2. In a stamp-battery, the low mortar with the vertical and inclined flanges at the
top to direct the splash through the screen, and the packing-strips attached to the
flanges and fitting around the stamp-heads which are longer than the depth of
the mortar.
3. The side frames or standards bolted to the sole-plate independently of the mortar
and having the open-top journal boxes for the cam-shaft cast integral with them.
4. The accelerator-springs acting to increase the momentum of the stamps, and
the swinging arms connected with the springs, and a means for throwing the arms
into or out of engagement with the tappets of the stamp-stems.
5. The rocking eccentrics, the fingers or arms having their lower ends connected

page_text: with the eccentrics, and their upper ends adapted to engage the tappets of the stamp-
stems, so that the movement of the eccentrics will raise or lower the stamps.
6. The adjustable eccentrics, the hanging-up fingers carried thereby, cushions upon
the upper ends of the fingers, and bearing-plates upon the cushions to support the
tappets and stamp-stems.
Dated this Twenty-fifth day of January 1890.
For the Applicant,
W. E. GEDGE,
Agent.