Improvements in Chasing Mills or Edge Runners.
Year: 1893

page_text: Date of Application, 27th Dec., 1893-Accepted, 10th Feb., 1894
COMPLETE SPECIFICATION.
Improvements in Chasing Mills or Edge Runners.
I, BRUCE CLARK WHITE, of 325 Dearborn Street, in the City of Chicago, and
State of Illinois, 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. :-
This invention relates to improvements in that class of grinding or pulverizing
machines known as chasing mills, which comprise a rotating table upon which the
material to be crushed is placed, and one or more heavy rollers resting upon the
table and journalled in supports affording a free vertical movement of said rollers,
while at the same time preventing them from moving with the table.
The machine illustrated in this instance is particularly intended for grinding or
pulverizing the clay used in brick making, but the same general principles of
construction may be employed in chasing mills used for other purposes.
Referring to the drawings:
Figure is a top plan view of a chasing mill constructed in accordance with my
invention.
Figure 2 is a sectional elevation taken on the line 2-2 of Figure 1.
Figure 3 is an end elevation of the machine.
Figure 4 is a plan detail of the base plate.
Figure 5 is a detail section taken on line 5-5 of Figure 3.
Figure 6 is a detail section taken on line 6-6 of Figure 7.
Figure 7 is a detail section taken on line 7-7 of Figure 6.
Figure 8 is a plan detail of the rotating table with the grating removed.
Figure 9 is a sectional elevation on line 9-9 of Figure 8.
Figures 10 and 11 are details of a construction of a plow point somewhat
modified from that shown in Figure 1.
In the drawings A designates the supporting frame work of the machine; B the
rotating table, and C the crushing rolls resting upon said table. Said supporting
frame work consists, in this instance, of two longitudinal sill timbers A' A², which
are adapted to be bolted to a suitable foundation by means of foundation bolts d.
Upon the sill timbers A' A are supported transverse timbers A³ A which in this
instance are notched into said sill timbers and are bolted thereto by suitable
bolts a. Said transverse timbers A3 A4 are spaced apart a distance greater than
the maximum diameter of the rotating table B, and the latter, which is of generally
circular form, is revolubly supported between them by being journalled at its center
upon the free upper end of a rigid upright shaft or spindle D. The spindle D is
supported in the frame work of the machine at its lower end only, said lower end
being for this purpose cast in or otherwise rigidly secured to a transverse base plate
or casting E, which extends between and rests upon the sill timbers A' A².
Such base plate or casting, which is shown in detail in Figure +, consists of a flat
web E adapted to be bolted to the sill timber by means of suitable bolts a³ and
provided at its center with a depending hub E within which the spindle I)
is tightly secured. Parallel depending webs Es engaging the inner sides of the sill
timbers and bolted thereto by suitable bolts a', serve to secure the base plate against
lateral movement, while transverse ribs E' extending from said parallel webs to the
hub E² serve to give the necessary rigidity and strength to the casting.
For the purpose of driving the rotating table B, the latter is provided on its
under side with a circular rack intermeshing with a bevelled driving pinion F
which is keyed to a horizontal driving shaft G. Said driving shaft is in this instance
supported by being journalled at its ends in suitable journal bearings G' G, the
Pries 8]

page_text: former of which is bolted to the adjacent surface of the base plate E, while the
latter rests upon and is bolted to a cross-timber A³ (shown as mortised into the sill
timbers A A³) by means of bolts a. An aperture formed in the transverse
timber A permits the passage of the driving shaft through said timber. Said shaft
is in this instance shown as provided with a driving pulley H by which the shaft
may be driven by means of suitable belting connecting with any suitable source of
power, and said shaft is also provided with a loose pulley H' upon which the belt.
may be thrown when it is desired to stop the machine.
Referring more in detail to the construction of the revolving table B, the same
consists of a circular bottom B surrounded by a cylindrical wall B² extending a
considerable distance above the bottom B¹ and serving to retain thereon the
material placed upon the table. Said bottom B' is composed of a solid circular
interior section B3 upon which the rollers C rest, and an annular rim B connected
with the interior section by a plurality of arms or ribs B. To said rim B the
cylindrical wall B is secured. That portion of the surface of the interior
section B3 which is traversed by the rollers C is preferably formed by a series of
removable segmental plates Be, which are countersunk into said interior section
and are secured therein by suitable countersunk bolts ; thus providing an annular
bearing surface which may be readily renewed when worn. The driving rack b
before referred to, is located on the interior section B³, said rack in this instance
being cast integral therewith, directly beneath the path of the rollers C. The
driving power is thus applied directly at the point of greatest resistance.
Upon the ribs B' and upon the outer edge of the interior section B³ and the
inner edge of the rim are secured perforated plates or gratings B; thus providing
a perforated annular section immediately adjacent to the cylindrical wall B² through
which the materials may sift after being pulverized? The ribs B' instead of being
radial are herein shown as being arranged obliquely to the radii of the table, this
construction being employed for the purpose of reducing the liability of the table
to break in casting because of the unequal contraction in the cooling of the parts
thereof.
The middle portion of the revolving table B which serves as a journal bearing
engaging the upper portion of the spindle D, consists of a cylindrical sleeve B8
extending both above and below the bottom B', and the closed upper end of which
rests upon the top of the spindle D and supports the weight of the revolving table
and parts carried thereby. Said sleeve B is herein shown as made of a separate
piece from the bottom 13 and as rigidly seenred within the same by being provided
with a conical bearing surface engaging a central aperture of similar shape in
the bottom R, and with a circular flange B at the lower edge of said bearing
surface upon which flange the bottom of the table is adapted to rest; suitable
bolts extending through said flange B and bottom B₁ serving to rigidly clamp
the parts together. The top portion of the sleeve B8 resting upon the upper end
of the spindle D is herein shown as made in the form of a separate cap B
adjustably secured to the sleeve by means of bolts 4, and provided centrally on its
under side with a downwardly projecting cylindrical boss B extending downwardly
from the cap and bearing at its lower end against the upper end of the spindle D.
A series of wear plates d of hardened steel or other suitable material are herein
shown as interposed between the lower surface of said boss B" and the top surface
of the spindle to afford an easily removable, anti-friction bearing between said
surfaces. As herein shown the wear plates immediately adjacent to the boss Bu
and the top of the spindle D are secured respectively to said boss and to the
spindle by means of screws d' d'; thereby relieving the surface of said boss and
spindle from any wear. To provide for lubrication of the bearing the top of
the spindle is provided with a recess D into which the boss B extends and in which
the wear plates are located, said recess being adapted to contain a considerable
quantity of oil in which the bearing surfaces are immersed.
For the purpose of providing for vertical adjustment of the table to counteract
the settling which will inevitably take place as the wear plates grow thin from

page_text: continued use, and which, if not provided for will cause the rack to bind against
the driving pinion F, an annular bearing plate B¹² is herein shown as interposed
between the sleeve B and cap 110, said annular bearing plate being made with its
interior diameter equal to or larger than the interior diameter of the sleeve B and
being clamped centrally between said sleeve and cap by means of the bolts 6.
When it is desired to raise the table to compensate for the wear of the plates d,
said annular bearing plate B12 may be removed from the machine and turned off
on its face or otherwise reduced in thickness so as to accurately bring the table to
the desired position. Upon the replacing of said bearing plate, after being so
turned off, and upon clamping the cap B firmly down upon said table, it is
obvious that the sleeve B, and with it the rotating table, will have been lifted
to a degree depending on the reduction in thickness of the said bearing plate.
Lubricant is introduced to the bearing thus formed, through suitable ducts B¹³
in the cap B and will fill that part of the recess D' not occupied by the boss Bl
and wear plates d and thereby keep the said wearing surfaces immersed in said
Inbricant, while the surplus lubricant will overflow the recess D¹ and run down
between the interior of the sleeve B and the spindle D for lubricating these parts:
the bearing plate B serving as a dam to prevent any of the lubricant from escaping
between the cap and sleeve.
As hereinbefore stated, the crushing rollers Care journalled in supports
which
afford a free vertical movement of said rollers, while at the same time preventing
their moving with the table B. To this end said rollers are provided with journals
formed by laterally extending ends of transverse shafts which are rigidly keyed
within the rollers, the journals thus formed being engaged by suitable journal
boxes provided in the outer ends of the radial arins II, the inner ends of which
are pivotally supported upon a bearing shaft J. Such pivotal engagement is
fornied by providing each pair of arms II with an integral sleeve 1 which is
journalled upon said shaft J. Adjustable collars I placed at each end of said
sleeve prevent lateral movement of the arms I and consequently of the rollers
journalled therein. The bearing shaft J is supported at its ends in suitable boxes.J'
which in this instance rest upon and are bolted to the transverse timbers A³ A',
the boxes being herein shown as held in place by the bolts a a² which secure the
transverse timbers to the longitudinal sill timber A².
Any suitable method of attaching the roller C to its shaft may of course be used,
but in this instance I have provided an attaching device in the form of a trans-
verse bolt e engaging a suitable aperture near the centre of the roll, and a transverse
slot in the circumference of the shaft. Provision is made for inserting said bolt by
forming in the face of the roll adjacent to one end of the bolt aperture, an elongated
recess of a length greater than the length of the bolt e, and near the other end
of the bolt engaging aperture a recess C³ sufficiently large to receive the retaining
nuts c by which said bolt c is secured in place.
Obviously by this construction the bolt c may be inserted in its aperture by
being first slipped into the recess C² and then driven longitudinally into its seat;
the retaining nuts being located in the said recess C³ and being engaged with the
bolt when the latter is inserted.
For the purpose of continuously deflecting or throwing inwardly the material
placed on the revolving table into position to be acted upon by the crushing rolls C,
the machine is herein shown as provided with oblique deflectors or plows K
placed diametrically opposite each other and supported within the cylindrical
wall B by means of suitable arms K' bolted to the stationary frame work of the
machine, in this instance to the transverse timbers A3 A4, by means of bolts aº.
Each of said plows is arranged with its lower edge near the surface of thie
table and with its outer margin near the cylindric rim B2; the plow being placed
at such an angle as to deflect the material lying upon the perforated annular
surface of the table inwardly upon the interior section 133 into the path of the
crushing rolls C. The body of the plow or deflector is shown as consisting of a
metal plate K which is bolted by bolts & to the supporting arm K1, the plate being

page_text: As
thus removable so that it may be easily replaced when worn out by long use.
a further improvement each plow is shown as provided at the augle formed by its
outer and lower edges, with a removable plate K³ secured to the body of the plow
by means of bolts k It will be obvious that the greatest wear on the plow will
occur at the point of the same which extends into the corner formed by the
cylindrical wall B and the bottom B of the table, and to provide for this I have
provided the removable plate K³; said plate being reversible so that two or more
of its corners may be placed in position to take the wear. In the particular con-
struction shown, the bolts pass through apertures in the plate K³ and elongated
slots in the plate K. The heads of said bolts are countersunk into the face of
the wear plates K³ so as to stand flush with the surface thereof and the bolt holes
in said plate are located at equal distances from each side and end thereof so that
the bolts will fit the holes when the plate is turned end for end with either side
edge uppermost or with either face in contact with the plow. Said bolt holes are,
furthermore, countersunk upon both sides of the plate to receive the heads of the
bolts when either face of the plate may be exposed. By this construction it is
obvious that every corner of the wear plate may in turn be placed at the point of
greatest wear, i.e. at the corner formed by the cylindric wall and bottom of the
table B, and thus may be used in its various positions a long time before it becomes
entirely worn out.
The operation of the machine thus described is substantially the same as that of
other machines of this class. The machine being set in motion, the materials to
be pulverized are thrown upon the table and by the operation of the plows Kwill
be directed beneath or into the path of the crushing rolls C C. The pulverized
material will gradually work out over the screens B and fall through the same
beneath the machine. Such portions of the material as are not reduced in size
sufficiently to pass through the perforations in the screen B' will be again deflected
by the plows into the path of the rollers C and again subjected to their action,
and by a continuation of this process all of the materials will eventually be
pulverized sufficiently to pass through the screens.
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. A chasing mill comprising a supporting frame work, a rigid spindle secured to
said frame work at its lower end only, a rotative table and a crushing roller adapted
to rest on said table, said table being provided with a central sleeve engaging the
upper end of said upright spindle and carrying the weight of the table and parts
supported thereby, substantially as described.
2. A chasing mill comprising a supporting frame work, an upwardly projecting
rigid spindle attached to said frame work at its lower end only, a rotative table and
a crushing roller adapted to rest on said table, said table being provided with a
central sleeve engaging the upper portion of said spindle, and a removable cap
adjustably secured to the upper end of said sleeve and adapted to rest on the upper
end of said rigid spindle to support the weight of the table and parts carried thereby,
substantially as described.
3. A chasing mill provided with an upwardly projecting rigid spindle, and a
rotative table provided with a central sleeve engaging the upper end of the spindle,
said sleeve being provided with an adjusting cap having a downwardly extending
boss engaging the upper end of the spindle, substantially as described.
4. A chasing mill provided with an upwardly projecting rigid spindle and a
rotative table provided with a central sleeve engaging the free upper end of said
spindle, a cylindric recess in the top of the spindle, a removable cap on said sleeve,
provided on its under side with a downwardly projecting boss extending into said
recess whereby the engaging surfaces of the bearing thus formed may be
constantly immersed in lubricant contained in said recess, substantially as
described.

page_text: 5. A chasing mill provided with an upwardly projecting rigid spindle, a rotative
table having a central sleeve engaging the upper end of said spindle, an adjustable
cap secured to the upper end of said sleeve, provided on its under side with a
downwardly projecting boss, a cylindric recess in the upper end of the spindle
adapted to receive said boss, and anti-friction wear plates interposed between the
bottom of the recess and the lower end of said boss, whereby the bearing surfaces
of the thrust bearing thus formed may be constantly immersed in the lubricant
supplied in said recess, substantially as described.
6. A chasing till provided with an upwardly projecting rigid spindle and a
rotary table having a central sleeve engaging said spindle, a removable cap adjust-
ably secured to the upper end of said sleeve, an annular bearing plate adapted to
be clamped between said cap and sleeve, the interior diameter of said annular plate
being not less than the interior diameter of said sleeve, a downwardly projecting
boss on the under side of said cap, a recess in the upper end of said spindle adapted
to receive said boss, and a duct for supplying suitable lubricant within said recess,
substantially as described.
7. A deflecting plow for chasing mills provided with a reversible rectangular
wear plate, provided at each end with an aperture located equi-distant from the
sides and end of said plate, said apertures being countersunk on both sides, and
securing bolts having countersunk heads for securing said wear plate to the face of
the plow, whereby said wear plate may be turned to bring either of its four corners
into operative position, substantially as described.
8. The combination with a revolving table and two crushing rollers, of oscillating
frames for supporting the rollers, and means for pivotally supporting the frames
embracing a horizontal shaft located at one side of the table and engaging both of
said frames, substantially as described.
9. The combination with a revolving table and a crushing roller, means for
supporting the roller consisting of a frame having two arms engaged with trunnions
or journals of the roller at opposite sides thereof, a tubular rock-sha't rigidly
connecting said arms and a stationary shaft affording a hearing for the said tubular
rock-shaft, substantially as described.
Signed, at Chicago, Illinois, this the 13th day of November 1893.
BRUCE CLARK WHITE.
Haseltine, Lake & Co.,
45, Southampton Buildings, London, Agents for the Applicant.