Improvements in Grinding Mills.
Year: 1889

page_text: COMPLETE SPECIFICATION.
Improvements in Grinding Mills.
1, FRANK CHAUNCEY HALL, of 12th and Buttonwood Streets in the City of
Philadelphia county of Philadelphia, and State of Pennsylvania, United States of
America, do hereby declare the nature of my invention for IMPROVEMENTS IN
GRINDING MILLS and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement :—
My invention is designed particularly for grinding paint but I do not limit myself
to its use for grinding this particular material as it may be used for the grinding of
other materials if found desirable.
The invention is particularly useful in the grinding of paint by reason of the fact that
I make provision in one mill for a series of grinding surfaces so that the capacity of
the mill is equal to as great a number of single mills as there are grinding surfaces in
my improved mill. By so combining a number of grinding surfaces I secure
compactness and economy of space. Further than this I provide a single hopper
including all the openings leading to the series of grinding surfaces by means of which
when it is desired to grind a paint of one color in all the mills, the material may be
poured into the hopper common to all and it will thus find its way to each grinding
surface. When it is desired however, to grind different colors at the same time I
provide supplemental hoppers which are removably positioned within the openings in

page_text: the bottom of the outer hopper leading to independent grinding surfaces whereby such
grinding surface may be utilized to grind different colors--the material being fed to
each grinding surface through its own hopper.
My invention therefore consists of a series of grinding surfaces having a hopper
common to all; and further of a series of grinding surfaces having a hopper common
to all with openings in the bottom of said hopper leading to each grinding surfaco and
a removable supplemental hopper adapted to each opening whereby the surfaces may
be used to grind one material with the outer hopper common to all; or to grind
different colors of different kinds of materials by the use of supplemental hoppers.
In the drawings:
Figure 1, is a front elevation of my improved mill.
Figure 2, is a section through the outer hopper, showing one of the supplemental
hoppers in place.
In these figures a hopper A, is shown supported upon four posts B, and this hopper
is provided with four openings in its bottom plate C, which lead to the grinding and
crushing surfaces of the four grinding mills, which are placed directly beneath the
hopper. These mills may be of any desired form. Instead of four two or more may
be used. In combining the series of mills in one apparatus I provide for driving them
simultaneously through the centrally located shaft a, which carries upon its lower end
a crown wheel b, which receives motion through a bevel gear d, fixed to the inner end
of the shaft e, upon which is placed the driving pulley f, which is in connection by
belting with suitable source of power. The spindles of the grinding mills are provided
with gears which mesh into a central driving gear on the upper end of the shaft a, so
that from this central driving gear all the mills of the series may be driven. It will
be understood that in case a greater or less number of mills are used that a modification
of this driving mechanism may be provided. In order to disconnect at will any one
or more of the mills from the driving mechanism I provide a clutch g, shown in detail,
by means of which the spindle or spindles may be thrown out of engagement with the
driving power and the mill thus remain idlo. These clutches are operated each by its
own handle h. Each mill is provided with a scraper I, which bears upon the periphery
of the runner and the movement of the runner cleans it from the material adhering
thereto which falls into the discharge chuto and from thence into a suitable receptacle.
I provide for the adjustment of the spindles by seating their lower ends in the bearing
block which is held in a pocket formed in a hanger k, pivoted at one end and connected
at the other end to the screw-threaded end of the hand wheel which has its bearings
in one of the lower cross braces of the machine. By manipulating this hand wheel a
proper adjustment of the spindle may be secured. It will be understood that each
spindle has this adjustment.
The supplemental hoppers are shown at a¹ and it will be understood that when it is
desired to grind one kind of paint or other material these supplemental hoppers are
removed and the material poured into the hopper A finding its way to each grinding
surface through the openings in the bottom. When, however it is desired to grind
different colors or materials at the same time, then the supplemental hoppers are
inserted in place and the material fed to each supplemental hopper.
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. The combination with a series of independent grinding surfaces, of a single outer
hopper with openings from said hopper to each grinding surface, substantially as
described.
2. In combination with a series of independent grinding surfaces, an outer hopper
with openings in the bottom thereof leading to each grinding surface and a
supplemental removable hopper for each opening whereby the grinding surfaces inay
be utilized to grind material of one kind or color or materials of different kinds or
color, substantially as described.

page_text: 3. In combination with a series of grinding surfaces, a single outer hopper common
to all, supplemental hoppers for feeding the material independently of each grinding
surface and an independent scraper and discharge chute for each runner, substantially
as described.
4. In combination a series of runners and means for adjusting the spindles thereof
consisting of a hanger for each spindle forming a seat therefor, said hanger being
pivoted at one end and adjustably supported at the other end, substantially as described.
Dated this 22th day of January 1889.
HUGHES, ELI & HUGHES,
76, Chancery Lane, W.U.,
Agents for Applicant.