Year: 1886

page_text: Date of Application, 21st June, 1886.
Complete Left, 26th Jan., 1887.
Complete Accepted, 18th Mar., 1887
I GEORGE FREDERICK REDFERN, of the General Patent Office, No. 4, South Street,
Finsbury, in the county of Middlesex, Patent Agent, do hereby declare the nature of
this invention to be as follows:-
This invention relates to driving centrifugal grinding mills by means of friction
gearing.
A suitable arrangement for carrying out the invention consists of a base plate on
which is bolted a cylinder having on its upper end or top a concentric cast iron plate
supporting the upper plate of the mill.
In the centre of the supporting plate is a bearing which receives the shaft of the
mill and on this shaft is adjusted the turning plate of the mill; The fixed and move-
able plates are each provided with a number of pins fixed concentrically for effecting
the grinding of the material which has been placed between the plates through an
opening in the fixed plate. The upper end of the shaft carries a paper cone fixed by a
set screw. At each side of the cone is a bracket or support having bearings carrying
a shaft, each shaft carrying at its inner end a bevelled disc wheel; the other end of
each of the said shafts is provided with a steel pin which pivots in a steel box provided
with a steel ball. The box is adjusted slightly frictionwise in a support containing a
lubricant so that both the pivots and the balls always work in the lubricant. A strong
spring presses on each box and screws are provided to set the disc wheels in frictional
contact with or to separate them from the paper cone. On the shaft of each disc
wheel and between its bearings is a pulley the two pulleys being driven by their straps
in opposite directions so as to give a uniform movement to the cone.

page_text: COMPLETE SPECIFICATION.
Improvements in Driving Centrifugal Grinding Mills.
I GEORGE FREDERICK REDFERN, of the General Patent Office, No. 4, South Street,
Finsbury, in the county of Middlesex Patent Agent do hereby declare the nature of
this invention (a communication from Abroad by Bapiste Touya fils of Tarbes
(Hes Pyrenées) in the republic of France) 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 driving centrifugal grinding mills by means of friction
gearing and in order to enable the invention to be fully understood I will proceed to
describe by reference to the accompanying drawing a suitable arrangement for carrying
out the invention. In the drawing figure 1 is a front elevation and figure 2 a side
elevation of a grinding mill constructed according to these improvements; figures
3 and 4 are plans of the grinding plates.
:
a, is a base plate on which is bolted a cylinder b, having on its upper end or top a
concentric cast iron plate c, supporting the upper plate d, of the mill. In the centre
of the supporting plate c, is a bearing e, which receives the shaft, of the mill and on
this shaft is adjusted the turning plate g, of the mill the fixed plate d, and the
moveable plate, are each provided with a number of pins fixed concentrically for
effecting the grinding of the material which has been placed between the plates through
an opening h, in the fixed plated. The upper end of the shaft, carries a paper cone, k,
fixed by a set screw. At each side of the cone k, is a bracket or support, having
bearings m, carrying a shaft n, each shaft carrying at its inner end a bevelled cast iron
dise wheel o the other end of each of the said shafts n, is provided with a steel pin p
which pivots in a steel box », provided with a steel ball's. The box is adjusted
slightly frictionwise in a cast iron support t, and serves to contain a lubricant, so that
both the pivots p, and the balls s, always work in the lubricant. A sirong steel
spring u, presses on each box », and screws v, are provided to set the disc wheels 0; in
frictional contact with or to separate them from the paper cone k. The screw e, bearing
on the spring u, causes it to exercise a continuous pressure on the box r, in which
turns the end of the shaft n, of the disc wheel o. The action is as follows:-When
the screw, is unscrewed the spring u, will noi press on the box and on the shaft n.
of the disc wheel o, which latter will no longer press against the paper cone k, and will
not be in frictional contact therewith. If the screw is screwed inwards the contrary
action will be produced and the disc wheel o, will be put in frictional contact with the
paper cone k. On the shaft n, of each disc wheel o, and between its bearings is a
pulley, the two pulleys, being driven by their straps in opposite directions (by
crossing one of the said straps) so as to give a uniform movement to the conc.
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 centrifugal grinding mill of suitable friction driving
gear such as two disc wheels and a cone.
2. The improved centrifugal grinding mill substantially as hereinbefore described
and illustrated in the accompanying drawings.