Crushing Mill.
Year: 1896

page_text: Date of Application, 17th Mar., 1896-Accepted, 16th May, 1896
Crushing Mill.
I, FRANK ATWOOD HUNTINGTON of 213 First Street in the City and County
of San Francisco State of California, U.S.A. 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 for crushing and grinding materials
especially ores, in which the crushing bed of the pan is inclined and the crushing
roller is mounted on an axis parallel with the plane of the crushing bed, and is
movable to and from said bed in a plane at right angles thereto.
My invention consists in the novel means for mounting the crushing rollers at an
inclination and permitting their movement to and from the crushing bed; also in
the interengaging curved surfaces of the crushing bed and roller shoe whereby the
crushing is rendered more effective and the roller, itself, is guided and held to its
seat with greater accuracy; also in the means for protecting the roller journal and
excluding dust therefrom; also in the feed hopper for distributing the ore and
feeding it directly in front of each roller, thereby avoiding undue wear, and in
various details of construction, arrangement and combination which I shall
hereafter fully describe and specifically claim.
Referring to the accompanying drawing for a more complete explanation of my
invention the figure is an elevation of my crushing mill, a portion of it being shown
in section.
A is a pan having side screens B, and central cone C. In the pan is the
incline die a the angle of which may be varied, though I prefer, and have shown an
angle of about 45 degrees.
Around the spindle D, rising from cone C, is fitted and adapted to revolve a
driver E, operated by the sleeve F having the driving pulley f.
G is the crushing roller, having a wearing shoe g. There may be one or more
of these rollers. They are mounted upon axes which are parallel with the plane of
the inclined surfaces of the crushing die a and they are adapted to move bodily
to and from the die in a plane at right angles thereto, whereby they crush and
grind the ore with a force due to their weight and to centrifugal action, and
yield to accommodate themselves to inequalities and obstructions in the ore bed.
The means I employ to mount the rollers are as follows:-The driver E is
formed or provided with downwardly and outwardly extending hangers e arranged
forward of the rollers, to the extremities of which are freely pivoted the arms e',
in the other ends of which are secured the axles or pins g' upon which the rollers
are mounted. Rigid guide bars & extend downwardly from the driver E, and lie
just outside the swinging arms e¹ whereby said arms are held and steadied against
the outward tendency of the rollers due to centrifugal action.
The rollers are also held and guided by making the die and the shoe of opposite
surface curvatures whereby they inter-engage. 1 have here shewn the die as
concave in lateral or cross section, and the shoe as convex, and though the reverse
may be had, I deem the form shown better than either the reverse or than plane
surfaces, for the further reason that the crushing is finer and surer, there being
more of a pulverizing tendency.
His a hopper mounted upon the driver E. From this hopper extends downwardly
a delivery chute h, one in front of each roller used. Ordinarily the ore is fed to

page_text: the mill from a stationary hopper. This is disadvantageous in that the material
being supplied at the same point all the time causes undue wear at that place.
But by having the hopper mounted on the driver, and providing it with one or
more chutes, according to the number of rollers, the ore is distributed and is fed in
such a manner that neither the rollers nor the die are subjected to unequal wear.
A suitable scraper or scrapers I depend from the driver E.
The inner surface of the end of swinging arm e' is recessed or chambered out
as ate and into this extends a flange g of the roller hub or centre, and by
this overlapping fully protects the journal from dirt. The head g of pin or axle g
is fitted in a chamber or socket on the inner side of the roller, and is protected
and the oil is kept in by a cap 93 bolted to the roller.
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 :-
1st. A roller crushing mill having a crushing bed, a driver, a crushing roller
connected with the driver, and a fixed guide bar extending from the driver and
passing outside the roller-carrying connection, for the purpose of holding the roller
against its outward tendency due to centrifugal action.
2nd. A roller crushing mill having a crushing bed, a driver, a crushing roller,
the means for connecting the roller with the driver, comprising a hanger arm
extending from the driver to a point forward of the the tread of the roller, and an
arm carrying the roller projecting beyond the tread thereof and pivotally hung
upon the lower end of the hanger arm, so that the roller may move to and from the
crushing bed, and a bar from the driver passing outside the roller-carrying arm to
hold and steady said arm as described.
3rd. A roller crushing mill having an inclined crushing bed, a roller mounted on
an axis parallel with the plane of the bed, a driver for operating the roller, a
hanger arm from the driver and an arm pivoted to and swinging from said hanger
arm and carrying the roller, whereby the roller may move to and from the crushing
bed in a plane at right angles thereto, and a guide bar from the driver passing
outside the swinging arm for the purpose described.
4th. A roller crushing mill having an inclined crushing bed, a series of rollers
mounted on axes parallel with the plane of the hed, a rotating driver having a
series of hangers secured to it, arms extending from the axes of the rollers and
pivotally connected with the hangers, guides for the arms and a feed hopper on
the driver having multiple delivery chutes, one of which delivers directly in front
of each roller.
Dated this Seventeenth day of March 1896.