Improvement in Crushing Mills.
Year: 1892

page_text: COMPLETE SPECIFICATION..
Improvement in Crushing Mills.
I, FRANK ATWOOD HUNTINGTON, of 213 First Street, in the City and County
of San Francisco, State of California, 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 crushing mills in which swinging rollers
are revolved within a pan and are swung outwardly by centrifugal force against an
encircling ring die.
My invention consists, in connection with a pan and rollers therein, of means for
imparting to said rollers a positive axially rotary motion whereby the rollers by.
contact with the pan are caused to travel around the ring.
The object of my invention is to avoid any tendency of the rollers to slip, and
thus to prevent unequal wear upon the surfaces of their shoes.
This object is attained by the positive rotary motion imparted to the rollers
whereby they cannot slip against the ring die or the mass of ore between them and
the die, but are made to rotate under all circumstances.
Referring to the accompanying drawings for a more complete explanation of my
invention,
Figure 1 is a vertical section of my mill showing one roller.
Figure 2 is a detail showing the suspension of one of the roller stems.
A is a frame work upon the base of which is mounted the pan B having the
usual cone centre b and the usual:sides.
Within the pan is the ring die C against which the rollers operate..
In the cone centre is mounted and adapted to rotate a shaft D, the lower end
of said shaft being suitably journaled or stepped upon a pin 6 in the lower end of
the cone centre.
Firmly secured to the upper end of the shaft D is the frame spider E having the
bearings e.in the extremities of its arms.
Pivoted by a pin f in the upper end of the shaft D is a separate power shaft F
having a pulley or other means by which it is driven.
Upon the lower end of the shaft is a gear G.
His one of the rollers having the usual shoe and the upwardly extending
hub h¹. There may be one or more rollers in the mill. The roller is suspended
and is adapted to turn with a stem I extending upwardly through the hub, and
having its lower end secured to the roller.
The stem I is journaled in a hanger J having side pins ; which are mounted and
adapted to rock in the bearings e in the extremities of the arms of the frame or
spider E.
Upon the upper end of stem I is keyed a pinion K the hub k of which fits down
nto a bearing in hanger J, and thus suspends said stem. The pinion K meshes
with gear G.
The operation of the machine is as follows
The shaft F is wholly independent of the shaft D, and has an independent
otation imparted to it by power transmitted to the pulley f. The rotation of the
haft F effects, through the gear G and the pinion K, the axial rotation of the
oller H, and said roller being a swinging one is thrown outwardly against the ring
lie C of the pan.
This contact of the roller and die, the former axially rotating, effects the travel
f said roller around the pan, this movement or travel being permitted by the

page_text: turning of the frame E from which it is suspended, said frame turning with the
shaft D as a centre.
In this operation the axial or primary rotation of the roller is a positive one, and
is due to the direct gearing connection between it and the power shaft F.
Its revolution about the pan, is a secondary movement, and is due to the contact
of said roller with the ring die in the pan; consequently, this positive rotation of
the roller avoids any possibility of said roller slipping on its contact with the
ring die or with an uneven mass of ore, and prevents any tendency to uneven
wearing of its shoes.
There is little friction to be encountered as the revolution or travel of the roller
about the pan is in the same direction as the revolution of the gear G which gives
to it its axial rotation; consequently, the full crushing effect is attained.
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 :-
1. In a crushing mill one or more axially rotary rollers carried by a revoluble
frame and having imparted to them a positive axial rotation, whereby, by contact
with the pan, they are carried around in said pan with their revoluble frame,
substantially as described.
2. In a crushing mill one or more axially rotary rollers suspended from a
revoluble frame by a hinge or joint enabling them to swing outwardly into contact
with the pan, said rollers having imparted to them a positive axial rotation,
whereby, by contact with the pan, they are carried around in said pan with their
revoluble frame, substantially as described.
.
3. In a crushing mill the combination of a pan, a revoluble shaft mounted therein,
having a frame attached to it, one or more rollers pivotally suspended from the
frame and adapted to swing outwardly against the pan; a second rotating shaft,
and gearing between said second shaft and the roller connections, whereby, a
positive rotary motion is imparted to said rollers, resulting through their contact
with the pan, in carrying them around bodily therein, substantially as
described.