Improvements in Crushing Mills.
Year: 1895

page_text: Date of Application, 20th Aug., 1895-Accepted, 12th Oct.,
1895
Improvements in Crushing Mills.
I, JOHN WALKER, of 576 West Adams Street, in the City of Chicago, County
of Cook and State of Illinois, United States of America, 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:~
In the description of the said invention which follows, reference is made to the
accompanying drawings forming a part hereof and in which,-
Figure 1 is a vertical central section of the improved mill, and Fig. 2 a plan of
the same.
Fig. 3 is a partly sectional view of certain parts of the mill, looking in the
direction indicated by the arrow in Fig. 2.
Fig. 4 and 5 are details of the invention, as hereinafter fully described.
Referring now to the drawings, A represents the foundation, B the sills, C the
bed-plate and D the frame of the mill.
The frame D is a hollow frustum of a cone having a flange a at its upper end
to which is secured the conical hopper E containing the removable crusher
liner F.
G is a gyratory spindle having its upper bearing in the tripodal bridge H which
is fastened to hopper E.
The vertical centre line of the mill is denoted by the dotted lines X-X, and
the axis of the inclined spindle is coincident with, or crosses it, at the point b, as
shown in Fig. 1.
I is the crusher head fastened to the spindle G.
J is a beveled gear wheel having a long hub c on its under side, adapted to turn
in a bearing d formed in the bed-plate G.
The axis of the beveled gear wheel J is coincident with the vertical centre
line of the mill, but the beveled wheel is bored in alignment with the inclined
axis of the spindle G, consequently in the rotation of the beveled wheel, the
spindle is given a gyratory movement, without rotation, about the axial line X-X
of the mill.
The beveled gear wheel J being loose on the inclined spindle G, the spindle
and its crushing bead may be raised and lowered independently of the said gear
wheel.
It is not new to have the inclined spindle non-revoluble and loose in the
revoluble gear wheel so that in the rotation of the wheel, the spindle and its
crusher head will have a gyratory motion without revolution, as described, and I
therefore make no claim to such construction and arrangement.
The spindle G at its lower end, has a hurdened hollow faced die f which rests
on a toe g seated on the upper end of a non-revoluble supporting shaft K, which is
hardened. This non-revoluble supporting shaft K, before my present invention,
has generally been stepped on a screw, whereby a limited vertical adjustment of the
spindle and crusher head could be obtained.
L is a counter driving shaft carrying a beveled pinion M in gear with the
beveled wheel J. This driving shaft is provided with a loose driving pulley N,
and a clutch O on a feather, whereby motion of the pulley is communicated to
the shaft.

page_text: One bearing of the counter shaft L is in the frame B, and the other, i, on a
cross sill P; and an ordinary lever Q is employed to move the clutch so as to set
the mill in motion or stop its operation.
The mill is provided with various oiling devices, and appliances looking to the
taking up of wear, but these, as well as the other parts of the mill above described,
form no part of the present invention, and they therefore require no further
description herein.
The non-revoluble shaft K before mentioned, is extended in the present
invention, downward through a suitable sleeve R bolted to the flange of the
portion of the bed-plate which forms the bearing for the hub of the gear wheel J,
and at its lower end is provided with lateral extensions or bosses which
constitute bearings for a shaft S which is stationary.
On the ends of the shaft S are two grooved wheels or sheaves T which are loose
on the shaft, as they revolve, when moved at all, in opposite directions as
hereinafter described.
U is another and revoluble shaft adapted to turn in bearings m formed in bosses
projecting from the sleeve R. This shaft which passes through a slot n in the
non-revoluble shaft K carries at one end a spirally grooved drum V, and at the
other, a grooved sheave o, and a worm wheel W.
.
A is a chain attached at one end to the spirally grooved drum V, and at the
other to a boss p on the sleeve R. The loop of the chain passes under the
wheels T and over the loose sheave o as shown. Fig. 5 shows the chain alone in
perspective.
B is a worm on the shaft C¹ which is supported in bearings in pendent
brackets D' extending from the upper flange of the sleeve R.
The outer end of the shaft C' passes through a third bearing in a hanger El
bolted to the under side of one of the sills B and is provided with a hand wheel F',
and between the hand wheel and the hanger is a ratchet wheel a¹ and a pawl b¹.
Supposing the head I to be situated somewhat lower than it is represented in
the drawings, and it is desired to raise the crusher head to make the product of the
mill of a finer grade, the hand wheel F¹ is turned in the direction of, or towards the
word "Fine" which winds the chain around the drum. The ratchet wheel and pawl,
hold the shaft C' in any position in which it may be placed.
In this operation, the chain A is wound around the drum V thus raising the
spindle G with its crusher head. It will be understood that as the sheave o is
loose, the strain throughout the chain and on the pulleys T is equalized. To
lower the crusher head, the operation as described is reversed by turning the hand
wheel in a contrary direction, or towards the word "Coarse."
By reference to Fig. 4 it will be seen that one of the sills B has a segmental
indicating plate G¹ which is suitably marked with the words "Coarse" and
"Fine" to guide the attendant in turning the hand wheel to grade the product of
the mill.
All the mechanism below the sills B is inclosed within a hood H' to prevent
entrance of the dust to the moving parts.
I is an oil pan situated in the sleeve R and around the non-revoluble shaft K
to retain oil in contact with the toe and its connections, to lubricate them. By
having the upper edge of the oil pan I¹ above the lower end of the revoluble
spindle G when the same is in its highest position, the frictional surfaces of the toe
and the non-revoluble shaft are always immersed in oil.
To admit of the attachment of the oil pan to the non-revoluble shaft K, the
hardened end of the shaft is made separate and provided with a pin which
enters a hole g¹ in the shaft, as shown in Fig. 1 in which the oil pan, the hardened
end and its pin f¹ appear in section, and the non-revoluble shaft K partly
in section.
From the foregoing description it will be understood that the spindle with its
crusher head is supported primarily by a chain which may be practically lengthened
or shortened to lower or raise the spindle with its crusher head, the spindle moving

page_text: through the bearings in the beveled gear and the tripodal bridge. The adjustment
of the crusher head is, therefore, a very simple operation and one that is performed
from a position exterior of the mill foundation, and while the mill is in operation.
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, the gyratory spindle carrying the crusher head, combined
with a supporting shaft for the spindle, sheave mechanism attached to the lower
end of the supporting shaft, a chain to sustain the sheave mechanism, and devices
to wind and unwind the said chain so as to practically shorten and lengthen it and
thereby raise and lower the crushing head, substantially as specified.
2. In a crushing mill, the gyratory spindle carrying the crusher head, combined
with a supporting shaft, a pair of sheaves attached to the lower end of the
supporting shaft, a looped chain to sustain the sheaves, and mechanism to wind
and unwind the chain and thereby raise and lower the crusher head, substantially
as specified.
3. In the crushing mill, the gyratory spindle carrying the crusher head, combined
with a non-revoluble shaft having a transverse slot therein, a shaft which passes
loosely through the said slot having at one end a winding drum, and at the other
a loose grooved sheave and a worm wheel, a shaft carrying a worm in gear with
the worm wheel, a shaft at the lower end of the supporting shaft having grooved
wheels, a chain attached at one end to the winding drum and at the other to some
stationary part of the mill, with its intermediate portion or loop passed under the
grooved wheels and over the grooved sheave, and means to revolve the said worm
shaft, and thereby raise and lower the said gyratory spindle, substantially as
specified.
4. In a crushing mill, the gyratory spindle carrying the crusher head, combined
with a supporting shaft, a pair of sheaves attached to the lower end of the
supporting shaft, a looped chain to sustain the sheaves, mechanism to wind and
unwind the chain and thereby raise and lower the crusher head, and a hood which
incloses the sheaves, chain and the winding mechanism, substantially as specified.
5. In a crushing mill, a supporting shaft for the gyratory spindle having a
transverse slot and provided at its lower end with a pair of wheels, a suitably
supported revoluble shaft extending through the transverse slot of the supporting
shaft having at one end a winding drum and at the other a loose sheave, mechanism
to revolve the said revoluble shaft, and a chain rove under the wheels and over
the sheaves and with one end attached to the said winding drum and the other to
some fixed part of the mill, substantially as specified.
6. A sustaining shaft for the spindle of a crushing mill having a removable
head piece, combined with an oil pan the bottom of which is confined between the
sustaining shaft proper and the head piece, substantially as specified.
Dated this 12th day of Jul, 1805.
1634
JOHN WALKER.
Haseltine, Lake & Co.,
45 Southampton Buildings, London, W.C., Agents for the Applicant.