Improvements relating to Mixing and Grinding Mills for the Manufacture of White Lead, Paints, and other Substances.
Year: 1899

page_text: Date of Application, 13th May, 1899-Accepted, 1st July, 1899
WALLELED ECIFICATION.
Improvements relating to Mixing and Grinding Mills for the
Manufacture of White Lead, Paints, and other Substances.
We, THOMAS TORRANCE and JOHN ROLAND TORRANCE, both of Bitton Foundry,
Bitton, in the County of Gloucester, Engineers, 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 machinery or apparatus employed in mixing and grind-
ing white lead, paints and other substances.
This invention consists in improvements having for their object to effect the
process of mixing and grinding more expeditiously and with less manual labour.
One improvement comprised in this invention has reference to the feed of the
materials, to be mixed and ground, to edge-runner grinding mills of the kind for
which Letters Patent were granted to us, dated April 24th, 1890, and num-
bered 6263, that is to say, in which the edge-runner roller is not rotated by
frictional contact with the pan but is itself driven by gearing, the pan being
stationary.
According to this invention, the substance to be treated is run from an over-
head bin or hopper into a throat which is concentric with the pan of the grinding
and mixing mill and is made in one piece with an oil container supported on or
made in one piece with a bracket which is bolted or otherwise fixed to a head
surmounting the central vertical shaft which drives the edge-runner roll gearing.
The throat aforesaid is extended down as a pipe and is detected from the central
axis of the pan and terminates in an open mouth at a suitable distance from the
pan centre, between it and the pan wall.
From the oil container an oil supply pipe is carried down alongside the pipe
aforesaid into the pan. The oil flows on to the substance to be ground, thus
damping it down and so preventing it from rising in the form of dust.
As the oil container and discharge pipe and the pipe whereby the substance to
be ground and mixed is delivered into the pan, travel round with the edge-runner
roll, the delivery of the substance and the oil into the pan takes place in a circular
path extending around in the pan.
Another improvement comprised in this invention consists in the provision of
a receiver connected to the edge-runner mill of the kind above specified, into
which receiver the ground and mixed substance is received from the edge-runner
mill. In this receiver is a conveyor having blades set at suitable distances apart
on a spindle which is rotated by a pulley or suitable gearing. The substance
discharged from the edge-runner mill into the receiver passes thence through an
aperture into the finishing mill which is of the granite roller type, or other suit-
able type. The passage of the substance from the receiver into the finishing
mill is assisted by the conveyor.
By the above described arrangement of machinery and apparatus, mixing and
grinding of white lead and other substances of the kind above indicated is effected
with greater expedition, and with less manual labour and with increased economy.
In the accompanying drawing is illustrated, partly in elevation and partly in

page_text: section, an edge-runner mill of the kind for which Letters Patent were granted
to us, dated April 24th, 1890, and numbered 6263, that is to say, in which the
edge-runner roller is not rotated by frictional contact with the pan but is itself
driven by gearing, the pan being stationary. The mill is illustrated as improved
in accordance with this present invention. There is also shown; in elevation,
a finishing mill known as a granite roller mill. Fig. 2 is a plan.
Bolted or otherwise fixed to the head-a surmounting and rotating with the
central vertical shaft b, is a bracket surmounted by an oil container d into
which extends the pipe e by which, from an overhead bin or 'hopper, the white
lead or other substance to be treated in the mill is delivered to the throat f which
does not communicate with the oil container d. The throat f is continued down
as a pipe and terminates in an open mouth at a suitable distance from the
centre of the pan g. By the pipe h oil is delivered to the container d. From the
oil-container d is carried down alongside of the dry substance feed pipe the
pipe opening into the container at the upper end and terminating at the lower
end in a mouth open to the pan g. As before indicated, the oil-container dis
carried round as the shaft 6 rotates, and therefore the feed of dry substance through
the pipe f and of the oil through the pipe is effected in a circular flow spread
around in the pan g. This rotatory feed, arrangement, which is an important
feature of this invention, obviates the necessity' of charging, by hand labour, the
dry substance and the oil into the pan g. The dry substance is damped down by
the flow of oil and so prevented from--rising as dust. The provision of the
revolving feed apparatus enables the employment of a cover g (indicated in dotted
lines at Fig. 1), which cover is attached to the shaft b, and therefore rotates there-
with. Apertures are provided in it for the projection therethrough of the pipes f
and i, and of the edge-runner roll j. An inspection door g2-Fig. 2-is provided
in the cover.
A further improvement comprised in this invention consists in providing means
for mechanically delivering the mixed and ground substance from the edge-runner
mill to the finishing mill. In the appended drawing the finishing mill shown is
of the kind known as a granite roller mill. Any other suitable kind of finishing
mill may, however, be used.
When a charge has been sufficiently treated in the edge-runner mill, the
sliding door which, while the substance is being treated in the pan 9, closes an
outlet aperture, is drawn out by operating the hand-wheel in the proper direction.
The mixed and ground substance then Hows by gravitation through the aperture
and descends into the open receiver m in which is a conveyor consisting of a
series of blades n arranged at suitable intervals apart and set at a suitable angle
upon a spindle o rotated by a pulley or suitable gearing.
The conveyor impels the substance towards the outlet, which is controlled by
a sliding door ? operated through a hand-wheel q. Descending through the
aperture controlled by the door p, the substance flows on to one of the rolls r
of the finishing mill and is further ground in the usual way between the said roll
and the other rolls in succession of the finishing mill or mills.
When the whole of the charge has passed from the pan g of the edge-runner
mill into the receiver m, the sliding door is closed and a fresh charge run into
the pan g. Similarly with respect to the receiver.
By grouping together the edge-runner mill and the finishing mill or mills, and
by providing a means of communication for delivery from the edge-runner mill
as above described and shown in the drawings, the process of mixing and grinding
is carried out with less manual labour and more expeditiously than with mills
not thus grouped and connected.
Having now particularly described and ascertained the nature of this invention,
and in what manner the same is to be performed, we declare that what we claim
is :
1. In edge-runner mills of the kind above described and illustrated in the

page_text: accompanying drawings for mixing and grinding white lead, paints, and the like;
rotatory feed apparatus consisting of a pipe such as f¹ for the supply of the
substance to be treated, and a separate oil container such as d with feed pipe such
as i; both pipes arranged to be carried round with the central vertical shaft of
the mill and so to spread in their travel the substance and the oil around in the
pan, substantially as hereinabove described with reference to the accompanying
sheets of drawings.
2. In combination with edge-runner mills of the kind above described and
shown in the accompanying drawings for mixing and grinding white lead, paints,
and the like, a receiver such as m as a conductor for conducting the substance
treated in the edge-runner mill from the said mill to a finishing mill or mills;
the said receiver being preferably fitted with a conveying device for assisting
discharge therefrom of the substance received by it, substantially as hereinabove
described with reference to the accompanying sheets of drawings.
3. Consolidation, into a compact and closely associated group, of machinery
or apparatus for the production of white lead, paints, and like substances, con-
structed, arranged and operated substantially as hereinabove described with
reference to the accompanying sheets of drawings.
Dated this 12th day of May 1899.
NICHOLAS WATTS,
Chartered Patent Agent, Bristol.
NICHOLAS WATTS,
Chartered Patent Agent, Bristol.