An Improvement in connection with Mills for Crushing and Pulverizing Ores and other Substances.
Year: 1890

page_text: Date of Application, 22nd Nov., 1890
Complete Specification Left, 24th Aug., 1891-Accepted, 3rd Oct., 1891
PROVISIONAL SPECIFICATION.
An Improvement in connection with Mills for Crushing and
Pulverizing Ores and other Substances.
I WILLIAM HENRY COWARD of Newark House, Railway Place, Bath, in the
County of Somerset, Engineer, do hereby declare the nature of this invention to be
as follows:-
My invention relates to a concentrator or means of separating the light, from the
heavy, particles of ores and other materials after being ground in pulverizing mills
such as those described in applications for Letters Patent dated March 27th 1889,
No. 5286; and October 15th 1890, No. 16409.
Between the hollow gudgeon or shaft of the drum of the said pulverizing mill
and the exhaust fan, I interpose an intercepting chamber which the crushed or ground
particles must traverse in a more or less horizontal direction before reaching the
exhaust fan, the dimensions of said chamber being such as to afford the heavier
particles an opportunity of falling out of the stream by their own gravity, assisted
or not by another air current, so that only the very light matters will be carried
across whilst the heavier particles will fall to the bottom of the intercepting chamber
which is hopper-shaped and furnished with a screw conveyor driven from the drum
shaft, whereby the matters collected in the hopper will be discharged through a
valve opening to give passage to the said matters and closing automatically to prevent
the ingress of air. An air inlet regulated by a valve is provided at the upper part
of the intercepting chamber to admit a current of air to assist in disengaging
the heavier particles and enable the fineness of the material so separated to be
regulated.
Dated this 22nd day of No 1000
W. H. COWARD.
By A. M. & Wm. Clark,
53, Chancery Lane, London, Patent Agents.
COMPLETE SPECIFICATION.
An Improvement in connection with Mills for Crushing and
Pulverizing Ores and other Substances.
I WILLIAM HENRY COWARD of Newark House, Railway Place, Bath, in the
County of Somerset, Engineer, do hereby declare the nature of this invention and in
what manner the same is to be performed, to be particularly described and ascer-
tained in and by the following statement :-
My invention relates to a concentrator or means of separating the light from the
heavy particles of ores and other materials after being ground in pulverizing mills
such as those described in applications for Letters Patent dated March 27th 1889
No. 5286, and October 15th 1890, No. 16,409.
The invention consists of an intercepting chamber interposed between the hollow
gudgeon or shaft of the drum of the said pulverizing mill and the exhaust fan, so
that the crushed or ground particles must traverse said chamber in such a direction
that the heavier particles will be arrested and caused to fall out of the stream,
so that only the very light matters will be carried across, whilst the heavier
particles will fall to the bottom of the intercepting chamber whence they are
discharged by a screw conveyor driven from the grinding drum shaft.

page_text: Reference is to be had to the accompanying drawings forming part of this
Specification, wherein
Figure 1 is a longitudinal vertical section of the separator or concentrator as
applied to my roller mill which is shown in elevation, and
Figure 2 is a transverse vertical section of the separator.
The same letters of reference indicate the same parts in both figures.
A is the outer casing, and B is the intercepting chamber of the separator. This
chamber is preferably of the cylindro-conical shape shown, its axis being vertical
and it is traversed longitudinally by a concentric tube C forming the conveying
tube of a screw elevator D, the tube being provided with inlet apertures e at bottom,
and outlets c¹ at top. M is the revolving cylinder of the roller mill constructed and
operating as described in the Specifications of my former Patents aforesaid, said
cylinder revolving upon a hollow shaft or journal supported in a bearing N, the end
of this journal making a close joint with the inlet orifice of the chamber B. E is
the exhaust fan casing similarly connected with the diametrically opposite outlet /,
of said chamber B, so that air enters from the mill only, all the joints of the inter-
cepting chamber being air-tight. This chamber is divided diametrically for a part
of its height by a transverse division plate Fat either side of the conveyor tube C,'
said plates standing in the direct path of the stream passing from 6 to b¹ and
extending up to such a height, as indicated in Figure 2, that the heavy particles of
mineral will gravitate on either side of the partition plate and settle down in the
hopper shaped bottom part of the chamber B, only the fine dust and light particles
passing on to the fan by which they are discharged into a dust settling chamber in
the usual manner. I may however provide for the admission of a downward air
current to assist the separation of the heavy from the light particles in the inter-
cepting chamber, and for this purpose there may be an annular aperture left open
at b² between the conveyor tube Ċ and the upper part of the intercepting chamber B
so that the current of air entering thereat will tend to throw down the heavy particles
at the bottom of the chamber B. The intercepted matters enter the conveyor
tube at c and are raised by the conveyor and discharged at c' into shoots c² by which
they are filled into bags. This conveyor D is driven by bevel gear d, shaft d',
belt, d from the journal of the mill M.
and
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is,
1st. The herein described separator or concentrator consisting of a divided inter-
cepting chamber with inlet, outlet, and screw conveyor arranged substantially as and
for the purpose specified.
2nd. The combination with the pulverising mill therein referred to, of the herein
described separator or concentrator applied between the hollow mill journal and the
exhaust fan and consisting of a divided intercepting chamber and screw conveyor,
substantially as specified.
Dated thie 94th dex of inenst 1901
Dated this 24th day of August 1901
W. H. COWARD,
By A. M. & Wm. Clark,
53, Chancery Lane, London, Patent Agents.