Certain Improvements in Crushing Mills.
Year: 1890

page_text: Date of Application, 13th May, 1890-Accepted, 14th' June; 1890`
COMPLETE SPECIFICATION.
Certain Improvements in Crushing Mills.
I FRANK ATWOOD HUNTINGTON, of No. 213 First Street, in the City'and' County'
of San Francisco, State of California, one of the United States of America,
Manufacturer, 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 that class of mills especially intended for the crushing of
quartz and valuable metal-bearing rock; and in which an annular series of pivotally-
suspended rollers are revolved within a pan, whereby the material is crushed between
said rollers and the rim of the pan.
My Invention consists in such novel improvements in this. mill, as will be hereinafter*
more fully described..
Referring to the accompanying Drawings for a more complete explanation of my
Invention.
.
Figure 1 is a vertical cross-section of my mill.
Figure 2 is a plan view of one of the crushing rollers and its supporting
mechanism.
A is a circular. pan, having a ring die B, fixed around the interior of it's rim, and
having suitable discharge-openings and screens.
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 the die, which may be
easily replaced whenever it is necessary. These rollers have each a sleeve E,,which
extends upwardly, and through these sleeves pass.shafts F,,for suspending the rollers,
as shown.
J is the driving-disk to which the shafts F are connected by means of the sleeve K,
having trunnions 1, projecting to each side, which turn in boxes on the disk, so that
the shafts have a pivotal movement, thus adapting the crushing-rollers to be thrown
outwardly centrifugally against the die of the pan.
The first improvement lies in the means for supporting and driving.the disk and the
rollers which it carries.
I form the bottom of the pan with a central uprising bearing or cone a, in which is
made a tapering hole or socket al. Into this hole or socket is fitted tightly the
standard-shaft M, the lower end of which is correspondingly tapered, so that it is
wholly supported in the bearing a, and is stationary therein, that is to say, it does not
turn on its axis, but is non rotary.
The driving-disk J, has a hub j, to which is bolted a bearing-sleeve j¹, and.. through
this hub and sleeve, the standard-shaft M extends, as shown.
To the top of the sleeve j, is bolted a cap-plate, having an oil-well from
which an oil-hole 1, extends down into an oil-chamber m,. in the top of the
standard M.
Fitted in the cap-plate is a toe-piece X, which is fixed therein. and extends down
into a socket m¹ in the standard, and rests its lower end upon a small bearing,m³, in
the base of said.socket.
A pulley. Y, is fitted to the sleeve j', and is the driving-pulley.
Now, it will be seen that the standard-shaft M, instead of being, as is usual, a
driving-shaft, is merely a supporting standard for carrying the entire weight of the
driving-disk and connected parts; the weight being carried by the top of the standard
through the intervention of the toe-piece. Power is applied to the pulley and rotates
the sleeve, the toe-piece turning in the socket in the standard M, and throngh the

page_text: i
rotation of this sleeve, the driving-disk and the suspended crushing-rollers are
revolved.
The object of this particular construction is to avoid driving the mill from below,
where the parts are difficult to reach, but instead thereof, to drive it from above,
which is more convenient and is more advantageous generally than driving from
below.
pan
The standard M is sufficiently smaller than the sleeve J¹, to provide a passage m³,
for oil, from the upper journal of the sleeve to the lower journal of said sleeve and
the hub of the driving-disk; and in the top of the cone-bearing a of the is
made an oil-chamber a², protected by the downwardly-extending flange of the hub j;
and said chamber, which is a waste oil-chamber, communicates with a channel m* in
the standard, and which extends to the bottom thereof.
Now, it will be seen that oil fed to the well 3 of the cap-plate j³, passes down
through the hole j into the oil-chamber m in the top of the standard, and thereby
Foils the journal of the toe-piece X, and also the upper journal of the sleeve j¹. The
oil thence passes down through the passage m³, and oils the journals of the base of the
sleeve and the hub of the driving-disk, and thence passes down into the waste-
chamber a², and from this through the channel mt, to a place under the pan, so that
none of it gets into the pan itself.
In order to assist the centrifugal action of the rollers by positively forcing them
out against the die of the pan and yet allowing them to yield when necessary, I have
the springs W.
These are curved in the shape shown, and are fitted loosely in dove-tailed grooves
formed in bearing-piéces k, on the sides of the sleeves K, which support the shafts F
of the rollers.
The upper ends of these springs are free, and are borne down upon by adjusting-
pieces or arms wo, which are connected with the sleeve j", and are vertically-movable
by reason of having elongated slots w¹, through which pass fixed bolts w into the
sleeve j¹.
By this construction it will be seen that the springs W, may be readily inserted, and
their tension may be regulated by the adjusting-pieces or arms w.
Another improvement herein, lies in the means for connecting the circular shoes D,
with the rollers C.
These shoes are formed on their bases with inwardly-projecting flanges d, which
pass under the rollers.
The rollers are made with the diameter of their upper surfaces smaller than the
diameter of their lower surfaces, so that their peripheral surfaces converge upwardly,
and the interior surfaces of the shoes are made parallel with the peripheral surfaces of
the rollers.
This leaves a space between the shoes and the rollers, the sides of which are
parallel. Into these spaces I drive wooden binding-pieces c, which instead of being
wedge-shaped, as heretofore, are made with parallel sides to correspond with the spaces
in which they fit.
Now, on account of the inclination of the various contact surfaces from the perpen-
dicular, it will be seen that the shoes cannot fall from the rollers, but have a tendency
to tighten themselves by their own weight, which would not be the case if the spaces
between the shoes and the rollers were wedge-shaped, as heretofore, and had wedge-
shaped pieces driven into them.
Another point of improvement lies in the manner of mounting and attaching the
scrapers P, which operate over the base of the pan, to the driving-disk. I connect
these scrapers to the lower ends of the arms O, which, in the present case, I make of
springy material, so that the scrapers can yield sufficiently, when required.
They are connected to these spring-arms by means of bolts o, through an intervening
elastic washer o¹, which makes a cushion for the scrapers.
The upper ends of the spring-arms are fitted in sockets in the driving-disk, and are
' held therein by means of the reversed wedges V, the object of which is to enable

page_text: the spring-arms to be readily removed by driving down one of the wedges from
the top.
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 crushing-mill, the pan having a non rotary or fixed central standard, upon
which is mounted a driving-disk, having a pulley for rotating it, and converging
swinging rollers operating in the pan, substantially as described.
2. In a crushing-mill, the pan having a non rotary or fixed central standard, about
which is mounted the driving-disk by its bearing-sleeve, said disk being supported by
a toe-piece connected with its sleeve, and journaled in the top of the standard, the
pulley for rotating the disk, and the swinging rollers carried by said disk and operating
in the pan, substantially as described.
3. In a crushing-mill, the pan having a central socketed bearing with a waste oil-
chamber in its top, the non rotary standard mounted in said chamber and having a
waste oil-channel, the rotary driving-disk, having a bearing-sleeve journaled on the
standard, and the crushing-rollers carried by the disk, the cap-plate bolted to the top
of the bearing-sleeve and having an oil-well and hole, the toe-piece fitted in the cap-
plate and journaled in the top of the standard, and the oil-chamber in the top of said
standard, substantially as described.
4. In a crushing-mill, the pan having the standard upon which is journaled the
rotary driving-disk carrying the swinging rollers, the springs, the lower ends of which
bear against the roller connections, and the vertically-movable pieces or arms bearing
against the upper ends of the springs for regulating their tension, substantially as
described.
5. In a crushing-mill, the crushing-rollers having bases of greater diameter than
their tops, the ring shoes fitted about said rollers, and having their interior surfaces
parallel with the peripheral surfaces of the rollers, and the parallel-sided binding-
pieces driven in between the shoes and rollers, substantially as described.
6. In a
crushing-mill, the scrapers operating over the pan bottom and carried
by spring-arms, substantially as described.
7. In a crushing-mill, the driving-disk, the scrapers and the arms of the scrapers
fitted in sockets in the driving-disk and held therein by reversed wedges, sub-
stantially as described.
Dated this Thirteenth day of May 1890.
For the Applicant,
W. E. GEDGE,
Agent.