Improvements in Grinding Mills.
Year: 1887

page_text: Improvements in Grinding Mills.
I HENRY HARRIS LAKE of the firm of Haseltine, Lake & Co. Patent Agents,
Southampton Buildings, in the County of Middlesex, 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 grinding mills.
In the accompanying drawing
Figure 1 represents a central longitudinal vertical section of a grinding mill
embodying the invention.
Figure 2 represents a side elevation of a detached portion.
Figure 3 represents a vertical section on line a, a, Figure 1.
Figure 4 represents a vertical section on line y, y Figure 1.
Figure 5 represents a vertical section on line 2, Figure 1.
さ
Figure 6 represents a vertical section on line a, a, Figure 1.
Figure 7 represents a face view of a portion of the bed or bed stone of the mill.
A represents the frame of a grinding mill, and B the driving shaft thereof, the
atter being mounted in bearings C, C₁ of said frame.
D represents the runner which is secured to said shaft B, and E represents the
ed which is secured to the frame A, said runner and bed occupying the casing or
hamber F which is secured to, or formed with the frame A, said casing being
xtended laterally, forming the chamber G, and having the hopper H secured to said
xtension, whereby the material to be ground, after leaving the hopper enters said
hamber Gand, is directed thence into the casing F, and fed between the runner
nd bed.
.

page_text: The shaft B has a sliding motion on its bearings in the direction of its length, and
carries on one end a driving pulley J, between which and the adjacent bearing C is a
coiled spring K, the effect of which is to force the runner from the bed, and thus
increase the space between them. In order to force the runner towards the bed, and
thus decrease the space between them, a ring L is employed whose interior is threaded
and engages with a threaded sleeve MI which encircles the shaft B, and is secured to
the frame, said ring being located between the bearings C and an arm or lever N,
whose lower portion is of the form of a boss N₁ and freely encircles the shaft B, and
whose upper part is attachable to the outer wall of the casing F by means of a spring-
pressed pin P, or in lieu thereof, a screw or other fastening, it being noticed that the
arm is rotatable on said shaft B.
The side of the boss N' opposite to the ring L has a cam-projection or spiral face Q,
which is in contact with a cam-projection or spiral face R of a sleeve S, which freely
encircles the shaft B. Contiguous to the sleeve S is a sleeve T which is secured to the
shaft B by a bolt T'.
The sleeve S is prevented from rotation by means of the arm S¹ which projects from
the said sleeve, and is freely connected with a pin S³ which slides in a bearing S³ on
the wall of the casing F.
It will be seen that when the ring L is turned on the sleeve M so as to be moved
in the direction towards the lever N, it is pressed against the said lever and the boss N¹
thereof, the sleeve S and sleeve T, whereby the shaft B is moved in the direction
from the pulley J overcoming the spring K and causing the runner to move
towards the bed, the reverse operation of the ring permitting the runner to move
from said bed.
By these provisions the mill may be nicely adjusted for coarse or fine grinding.
Should however, nails or other obstructions enter between the runner and bed,
it is important to remove the same. This is accomplished by releasing the pin P and
and rotating the lover N, whereby the wide part of the cam of the boss N leaves the
similar part of the cam of the sleeve S, and the spring K immediately exerts its
pressure on the shaft B, quickly moving the runner from the bed, and allowing the
obstructions to drop out, it being collectible at the bottom of the casing For in the
receptacle C for the ground material.
When the lever N is returned to its first position the cams above stated cause the
shaft to slide in such manner that the runner advances towards the bed, and the
grinding may be continued, it being, noticed that the adjustment of the mill has not
been disturbed.
The runner has a lateral tubular extension U which passes through the cyo of tho
bed and occupies the lateral extension chamber G of the casing, the said extension
having its exterior toothed. In the chamber G at the side thereof, is a toothed
concave V which partly encircles the extension U and forms with the same, means for
primarily cracking or breaking the material supplied to the bopper, whereby the
subsequent grinding is more easily and expeditiously performed, it being noticed that
the cracked or broken material is directed from the chamber G of the casing F to the
eye of the bed, and thence between the runner and bed.
To the periphery of the runner is pivoted a gravitating clearer W which rotates
with the runner in the casing F and serves to remove any material collected in said
casing.
As the clearer projects across the bottom throat of the casing and almost reaches tho
opposite wall thereof as shown in Figure 1, when the runner is moved from the bed
the clearer strikes the said wall and rides upward thereon, owing to its pivotal connec
tion with the runner. When the runner is moved towards the bed the clearer drops to
its normal position.
The receptacle for the ground material is in communication with an exhaust fan X
whereby shells, chaff, dust or similar substances may be removed from the said receptacle,
leaving the material clean.
The runner is secured to the shaft by means of the rim T which is connected with

page_text: said runner, and encloses a split collar T3 which is formed with, or attached to the
sleeve T.
At the ends of the collar T³ is a conical plug T which is in contact with said ends
and having its outer end threaded for engagement of the nut To by which the degree
of expansive action of the plug on the ends of the collar may be adjusted.
To the side of the plug is secured a pin T which enters between the ends of the
collar for preventing rotation of the plug.
It will be seen that when the plug T is properly tightened against the ends of the
collar T3, the rim T and said collar are firmly connected, whereby the power of the
shaft is imparted to said rim, and consequently to the runner, the holding
action of the split collar being sufficient to rotate the runner during the operation of
grinding.
Should however, the runner be obstructed in any manner, whereby its rotation is
resisted, the rotation of the shaft continues but tho split collar slips on the rim whereby
while the runner is held by the obstruction, said runner and connected parts are
prevented from being injured or fractured.
Interposed between the sleeve Y and the runner and its extension U is a filling of
soft metal Z, it being noticed that the exterior of the sleeve Y is corrugated in opposite
directions, so that the metal which has flowed around the corrugations is firmly locked
to the sleeve, the connection of the metal and sleeve thus being tongued and grooved,
firmly uniting the parts.
The bed is secured to the frame by dovetailed lugs Z' which enter dovetailed
openings in the bed, said lugs being secured to the frame by bolts or screws Z².
Interposed between the lugs and the openings in the beds, is soft metal, as at Z³,
whereby the bed is firmly held in position, the said soft metal also providing for any
inequality in the casing, causing the bed to be true on its face.
The bosses of the bearings e, el are split and have their ends connected by
tightening bolts c². Interposed between the shaft and bosses, are sleeves and
fillings of soft metal, whereby the sleeves may be removed and replaced and
provision is made to cause the shaft to rest true in its bearings, regardless of any
inequalities of casting.
Interposed between the ring L and boss N¹ of the arm N is a washer L' which
freely encircles the sleeve M, and has its lower side or end extended, forming a lip
which is fitted in a longitudinally extending shot L in the portion of the frame of the
machine below said boss, the said washer being adapted to move in said slot without
capability of rotation.
The bed or bed stone has on its face teeth, preferably, of pyramidal form, and
between the concentric rows of the same above the eye are segmental webs E', the
object thereof being to prevent the material from dropping back to the eye or feeding
point.
Having now particularly described and ascertained the nature of the said invention,
and in what manner the same is to be performed as communicated to me by my
foreign correspondent, I wish it understood that I claim :—
First. In a grinding mill the runner thereof secured to its shaft by means of a
sleeve which is fastened to the said shaft, and soft metal which is interposed between
the runner and sleeve, the said metal and sleeve being connected by tongues and
grooves, substantially as described.
Second. In a grinding mill, the bed thereof secured to the frame of the mill
by means of a dovetailed lug entering a dovetailed opening in the bed, and soft
metal interposed between the lug and bed, the said lug being connected with the
frame, substantially as described.
Third. A grinding mill having a runner connected with a shaft which slides on its
bearings, a spring pressing against the said shaft adapted to force the runner from
the bed, and a ring substantially as described, adapted to force the runner towards

page_text: :
the said bed, whereby the mill may be adjusted for fine and coarse grinding as
stated.
Fourth. A grinding mill having a runner connected with a shaft which slides
on its bearings, a cam freely encircling said shaft and sliding therewith, a rotatable
cam encircling the said shaft and a spring pressing against the said shaft,
whereby when the rotatable cam is operated in one direction, the spring operates to
separate the runner from the bed, and when the said cam is operated in the other
direction the runner is returned, substantially as described.
Fifth. A grinding mill having means substantially as described whereby the runner
may be moved for adjusting the mill for fine or coarse grinding, and seperating the
runner from the bed for release of obstruction between the same without disturbing
the adjustment of the mill, substantially as described.
Sixth. A runner and a sliding shaft carrying the same, a sleeve with a cam freely
encircling the said shaft and movable therewith by means of a head which is secured
to the shaft, and is in contact with the said sleeve, a rotatable and sliding boss with a
cam encircling the said shaft and provided with an operating arm or lever which is
connectible with the frame of the mill, a threaded sleeve secured to the shaft, a screw
ring fitted on the said sleeve bearing against the aforesaid boss, and a spring pressing
against the shaft in the direction from the bed of the runner the said parts being
combined and operating substantially as described.
Seventh. The runner shaft B carrying the boss N₁ the sleeve S and head T, the said
boss and sleeve freely encircling said shaft, and the head being fixed to the same, in
combination with the pin P which secures the lever or arm N of the boss to the frame,
and permits the said arm to slide on the said pin, and the pin which secures the sleeve S
to the frame and slides on the latter, the said boss and sleeve having cams which engage
each other substantially as described.
Eighth. A grinding mill having a breaking device in advance of the grinding
mechanism, substantially as described.
Ninth. A grinding mill having its grinding chamber and the runner extended
laterally towards the inlet, the extension of the chamber containing a toothed concave,
and the extension of the runner having a toothed periphery, forming a breaking
device in advance of the grinding device, said parts being combined and operating
substantially as described.
Tenth. A grinding mill having its runner connected with a sliding shaft for
purposes of adjustment, and provided with a pivotted clearer, substantially as described,
the said clearer rotating with the runner in the grinding chamber, and turning on its
axis when brought into contact with the frame during movement of the shaft for the
purpose set forth.
Eleventh. A grinding mill having a shaft and bearings therefor, with a sleeve and
filling of soft metal between the shaft and the boss of said bearings, the said boss
being divided and connected by a screw, substantially as described.
Twelfth. A runner of a grinding mill connected with the shaft thereof by a yielding
or "slip" fastening, constructed substantially as described.
Thirteenth. A runner fitted loosely on a shaft, and provided with a rim which is
engaged by a split rim, the latter being firmly connected with the shaft, forming a
yielding or slipping connection for the runner, the said parts being combined and
operating substantially as described.
Fourteenth. A fastening for the runner of a grinding mill and its shaft consisting
of a split ring, a tapering plug a nut on said plug, and a rim with which the said ring
is in frictional contact, and which is connected with the runner the parts being
combined and operating substantially as described.
Fifteenth. In a fastening substantially as described, the plug H having a pin L
whereby rotation of said plug is prevented as stated.

page_text: Sixteenth. The sleeve M, the runner D, the driving shaft, and a spring bearing
laterally against said shaft, in combination with the siceve S, the casing F, the collar or
arm N, the screw nut or ring L encircling said sleeve M, and the sliding and non-
rotatable washer L' interposed between the ring L and boss N¹ of the collar or arm N
substantially as and for the purpose set forth.
Seventeenth. In a grinding mill, the washer L in combination with the frame having
the slot L² to receive a lip on the said washer, substantially as described.
Eighteenth. In a grinding mill, a bed having between its concentric row of teeth
one or more webs E substantially as described.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C.,
Agents for the Applicant.