IMPROVEMENTS IN "LUBRICATING BEARINGS FOR MILLSTONES
Year: 1878

page_text: LETTERS PATENT to William Phillips Thompson, of 6, Lord Street, Liverpool,
in the County of Lancaster, International Patent Agent, for the Invention
of IMPROVEMENTS IN "LUBRICATING BEARINGS FOR MILLSTONES."
A com-
inunication from abroad by Garland Hamuer Davison, Physician, of the City
and County of Baltimore, in the State of Maryland, and United States of
America.
Sealed the 8th November 1878, and dated the 27th August 1878.
COMPLETE SPECIFICATION filed by the said William Phillips Thompson
at the Office of the Commissioners of Patents on the 27th August 1878.
WILLIAM PHILLIPS THOMPSON, of 6, Lord Street, Liverpool, in the County of
Lancaster, International Patent Agent. IMPROVEMENTS IN LUBRICATING BEARINGS
FOR MILLSTONES." A communication from abroad by Garland Hamner Davison,
Physician, of the City and County of Baltimore, in the State of Maryland, and United
States of America.
Figure 1 is a perspective view of my improved device as applied to a mill, a portion
of the upper stone being removed to show the construction of parts.
Figure 2 is a like view of the oiling devices and spindle, separated from the
stones.
Figure 3 is a like view of said oiling devices, separated from each other and from
the spindle and stones.
And, Figure 4 is a vertical central section on line x, x, of Fig, 1.
In the use of grinding mills which have vertical spindles, great difficulty has
heretofore been experienced in properly lubricating the spindle within the stationary
stone and in preventing dust from getting into the bearing. To remedy these diffi-
culties is the main object of my Invention, which consists principally in the peculiar
construction of the oil cup.
It consists further in the peculiar construction of the grease collar and grease
cap, and their combination with each other and the stones and the spindle.

page_text: It consists further in the means employed for holding the grease cap upon the
grease cup, and compensating for the use of parts.
It consists further in the means employed for feeding oil from the oil cup to the
spindle.
And, finally, it consists in the devico as a whole, its several parts being con-
structed and combined with each other and with the stones and spindle, all as fully
described herein-after and shown in the Drawings, in which,―
A, A, represent the vertical posts, and B, B, the horizontal rails of the frame of a
grinding mill which sustains and supports a fixed lower stone C, all of usual con-
struction; at the centre of the stone C is provided a square opening c, and
at the upper end of such opening is formed a recess c', which just equals in
diameter the long horizontal dimensions of said opening. Fitted within the
opening c is a metal bushing D, which closely fills the same, and has its upper end
flush with the bottom of the recess c'.
At four equidistant points within the upper end of said bushing are formed
recesses d, which are adjacent to a central opening d¹ that is intended for the
reception of a spindle E.
At one corner of each recess d, upon the side next to the opening d¹, is provided
a notch d", through which passes one end of a wick F, the body of said wick being
contained within said recess, together with the oil for lubricating the spindle E, said
oil being fed to said spindle by said wick.
Fitted within the recess c of the stone C is a collar G, which closely fills the
same, and has its upper surface flush with the upper surface of said stone. At its
centre said collar is provided with an opening g that is somewhat larger than the
spindle E, and at such point said collar is extended upwards, and at its upper edges
inclines downward and inward, as shown. Above the collar G the spindle E is
somewhat reduced in diameter, and upon such reduced portion is closely fitted a
cap H, which is keyed to and revolves with said spindle and extends downward
over the vertically extended portion g¹ of said collar G, with its lower end bearing
upon the upper horizontal face of the latter. The interior of said cap H is fitted
closely upon the periphery of said part g' and forms an additional bearing for the
Baid spindle.
The upper stone or runner I is suspended from the upper end of the spindle E in
the usual manner, and is caused to revolve by the latter by means of a driver K
upon the squared portion of the spindle, and has its ends contained within recesses
that are formed within opposite sides of the centre opening i of said stone. Between
the driver K and cap H is placed a spring L, which operates to hold the latter
down upon the cup g', while to prevent the upward pressure of said spring from
raising said driver, a set screw or pink passes through the latter and into or
through the spindle E.
Between the lower end of the collar G and the bottom of the recess c¹ is fitted a
gasket M, of suitable elastic material, after which said collars is secured in place by
means of bolts or pins 911 that pass downward through the latter into the
bushing D.
The device is now complete and operates as fellows:-The bearing of the spindle
E within the bushing D is lubricated by means of oil that is fed by the wicks Fas
rapidly only as is necessary, and such bearing is prevented from being fouled by
dust or dirt by the packing gasket M, while the bearing surfaces of the collar G and
cap H are lubricated by means of oil or grease placed within the grease cup g', the
last-named bearings being kept free from dust or dirt by the peculiar construction
of parts as before named. By this construction of lubricating devices the mill is
enabled to run many times longer without attention than has heretofore been
possible.
In consequence of the additional bearing for the upper portion of the spindle,
which is afforded by the collar and cap, the runner has greater steadiness of
motion than has heretofore been obtainable, and not only does better work, but will
run longer without dressing than would otherwise been practicable.

page_text: Having now described my Invention and the manner in which the same
may be carried into effect, what I claim as new and desire to secure by Letters
Patent is,
First. In combination with the stone C and with the spindle E, the bushing D,
provided with a central opening d, and within its upper end with oil recesses d' and
notches that extend between the latter and said opening, and the collar G fitted
around said spindle and over said bushing, substantially as and for the purpose
specified.
Secondly. In combination with the oil recossos (l' of the bushing D, and with the
spindle E, the wicks F, extending from said recesses through the notches d¹¹ to said
spindle, substantially as and for the purposes shown.
Thirdly. In combination with the stone C and spindle E the collar G, provided
with the grease cup g' and secured to said stone, and the cap H attached to and
revolving with said spindle, and fitting over said grease cup, substantially as and
for the purposes set forth
Fourthly. In combination with the stone C and spindle E the bushing D, provided
with the oil recesses d', the wicks F, the collar G, having the grease cup g¹, the
gasket M, and the cap H, said parts being constructed and arranged to operate in
the manner and for the purpose substantially as shown and described.
In witness whercof, I, the said William Phillips Thompson, have hereunto set
my hand and seal, this Twenty-fourth day of August, in the year of our Lord
One thousand eight hundred and seventy-eight.