CERTAIN IMPROVEMENTS IN CRUSHING MILLS
Year: 1885

page_text: I, FRANK ATWOOD HUNTINGTON, of number 45 Fremont Street, in the city and
county of San Francisco, and State of California, one of the United States of
America, Manufacturer, do hereby declare the nature of my invention for CERTAIN
IMPROVEMENTS IN CRUSHING MILLS, and in what manner the same is to be per-
formed, to be particularly described and ascertained in and by the following
statement:-
;
My invention relates to a crushing-mill, which is more especially intended for
the crushing of quartz and valuable metal-bearing rock.
It consists in certain details of construction relating to the crushers, the manner
of suspending and lubricating them and protecting them from dirt and grit, and in
the construction of scrapers which are used therewith, all of which will be more
fully explained by reference to the accompanying drawings, in which
Figure 1 is a vertical section of the pan, showing the rollers with their stems
and sleeves, also the scrapers.
Figure 2 is a view of one of the scrapers.
Figure 3 is a plan view, showing the driving disk from which the rollers are
suspended.
A is a circular pan, having a ring die B fixed around its interior near the
bottom, and having suitable discharge openings and screens; this portion being
constructed like that shown in my United States patent of May 8, 1883 N° 277,134
The rollers C which do the crushing have exterior circular shoes D secured to them,
these shoes rolling against the interior of the die B, so that the material is crushed
between them, and the wear comes upon the shoes and dies which may be easily.
replaced whenever it is necessary.
These dies which are preferably of rolled steel, are formed with a flange a around
their interior near the bottom, and hook-bolts b pass through the rollers C with the
hook beneath the flange, so as to support the dies and hold them in place. Wooden
wedges c are driven between the dies and the rollers, and as they swell when wet,
they will hold the two firmly together.
The flanges a are held by the hook-bolts against the bottom of the rollers, and
they prevent the dies from being forced up by pieces of rock which may be jammed
below them. The dies around the interior of the pan are secured by wooden
wedges in a similar manner.
A sleeve E extends upward from each of the rollers C, and has a hole made
through it to allow the shaft F by which the crushing roller is suspended, to pass
down through the sleeve and through the roller. The lower end of this shaft has
an enlargement or head G formed upon it, and a corresponding chamber is made in
the bottom of the crushing roller to receive this head. Between the head and the
interior of the chamber, washers H are placed which serve to relieve the parts of
friction.

page_text: A cap or plate I is fitted with rubber or other packing so as to screw upon the
bottom of the crushing roller, thus making the chamber within which the head of
the suspending shaft lies perfectly tight, and this chamber is then filled with oil
or lubricant so that the rollers may turn easily upon the shaft, and at the same
time will be kept entirely free of the grit and dirt.
J is the driving disk, from which the rollers are suspended as follows:
K is a sleeve, having trunnions L projecting to each side from it, and these
trunnions turn in boxes supported upon the disk, so that the trunnions stand at
right angles with a radial line from the center of the disk.
The upper end of the shaft is keyed in this sleeve, and the lower end of the
sleeve has an enlarged opening which fits over the upper end of the sleeve E, as
shown. This prevents any dirt from falling in at the top of the lower sleeve and
working down around the shaft, thus keeping the whole of that portion entirely
clean and well lubricated.
The disk J is peculiarly formed with large curved openings K, so that when the
trunnions are lifted out from their journal boxes, the shafts, with their sleeves and
the attached rollers may be lifted directly out through these openings without in
any way disturbing any other part of the apparatus.
By this construction the rollers are allowed to swing inward and outward about
the suspending trunnions, and as the disk is driven around by the central driving
shaft M, to which it is keyed, and the gearing N below, the rollers C will be
caused to rotate about the shafts F, rolling against the interior dies which are fixed.
within the pan, thus crushing all the material which may come between them
until it has reached a suitable fineness.
The pan has a flange L' projecting inwardly a short distance above the screen-
openings, and the effect of this flange is to turn the material downward and prevent
the tendency to rise to the top by the centrifugal and upward action as it escapes
from between the rollers and the dies. Scrapers are used in connection with these
rollers in the same manner as in my former patent, but I have improved my
scrapers as follows:
O are the vertical rods or arms to which they are secured, and which are made
adjustable up and down in the driving disk J. P are the scrapers which are fixed
to them, these scrapers are made with double edges, as shown, and have two bolt-
holes through them, through which bolts Q pass, and by which they are firmly
secured to the arms.
Whenever the lower edge of the scraper becomes worn, or for any other reason
it may become necessary, it is easily removed and reversed, so that the other edge
projects downward and may be made to work.
Having now particularly described and ascertained the nature of my said
invention; and in what manner the same is to be performed, I declare that what
I claim, is
In a crushing or grinding apparatus, a circular pan or dies with vertical axis,
rollers turning loosely upon the lower ends of vertical shafts suspended from the
periphery of a disk which is secured to a central driving shaft so that the rollers
may swing inward and outward, and be caused to travel around in contact with
the sides of the pan or dies by centrifugal action, and means for protecting the
moving parts from dust and wear, as shown, together with removable flanged rims
or hoops with means for securing them to the rollers, and arms carrying reversible
stirrers or scrapers.