Improvements in the Manufacture of Finely Pulverised Substances for Use in the Production of Portland Cement, Pigments, and the like.
Year: 1895

page_text: Date of Application, 11th Sept., 1895
.omplete Specification Left, 6th June, 1896-Accepted, 1st Aug, 1596
PROVISIONAL SPECIFICATION.
Improvements in the Manufacture of Finely Pulverised Substances
for Use in the Production of Portland Cement, Pigments, and
the like.
I, ALEXANDER PATRICK, of 16 Bothwell Street, in the County of Glasgow, North
Britain, Merchant do hereby declare the nature of this invention to be as follows, that
is to say
1
My said invention relates to apparatus of the kind described in my Patent
Specification No. 21292 of 1893, and in which the finely ground materials are passed
by an air current to and through a screen or sieve and into a depositing chamber.
In carrying out my present invention, instead of making the screen or sieve fixed
as formerly make it in a cylindrical or polygonal form and place it across the
depositing chamber in an inclined position. cause the screen to rotate by means of
any suitable mechanism, and I cause the air blast and ground materials to enter at the
lower end, the upper end being closed, or having a small outlet fitted with a regulating
valve. A kind of enclosing hopper is arranged at the lower end of the screen; and
whilst the air blast and ground materials enter through this hopper, it also serves to
receive the portion of materials which will not pass through the screen, the screen
being inclined as described so that these materials which are not sufficiently fine may
find their way into the hopper. The hopper is made with a pocket at its lower part
to receive the returned materials and the bottom of the hopper is fitted with a rotating
discharger.
Dated this Tenth day of September 1895.
EDMUND HUNT,
Applicant's Agent.
Improvements in the Manufacture of Finely Pulverised Substances
for Use in the Production of Portland Cement, Pigments, and
the like.
I, ALEXANDER PATRICK, of 16, Bothwell Street, in the County of Glasgow, North
Britain, Merchant, 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, that is to say :-
My said invention relates to apparatus of the kind described in my Patent
Specification No. 21,292 of 1893, and in which the finely ground materials are
passed by an air current to and through a screen or sieve and into a depositing
chamber.
And in order that my said invention and the manner of performing the same
may be properly understood I hereunto append a sheet of explanatory drawings to be
hereinafter referred to and showing in sectional side elevation by way of example, a
modification of the apparatus suitable for the manufacture of Portland cement as made
with my present improvements.

page_text: In carrying out my present invention many of the parts of the apparatus shown on
the drawings are substantially the same as corresponding parts of the apparatus shown
and described in my earlier Patent Specification hereinbefore referred to and for
convenience the same reference letters are used to indicate such parts in the
accompanying drawings.
In my present improved apparatus instead of making the screen or sieve fixed as
formerly I make it of a cylindrical or polygonal form, Q, and place it across the
depositing chamber, R, in an inclined position. I cause the screen, Q, to rotate by
means of a belt to be applied to a pulley, Q1, on its shaft or by means of any suitable
mechanism. I cause the air blast and ground materials in the wind duct, M, to enter
at the lower end of the cylindrical screen, Q, the upper end being closed with fine
wire gauze protected with coarser wire netting; or the upper end may have a small
outlet fitted with a regulating valve. A kind of enclosing hopper, P 1, is arranged at
the lower end of the screen, Q, and whilst the air blast and ground materials enter
through this hopper, it also serves to receive the portion of the materials which will
not pass through the screen, Q, the screen being inclined as described so that the
materials which are not sufficiently fine may find their way into the hopper, P 1. The
hopper, P1, is made with a pocket, P 2, at its lower part to receive the returned
materials and the bottom of the pocket, P 2, is fitted with a rotating discharger, U,
which feeds the materials into the duct, V, through which they pass back to the mill
stones, F, to be ground over again.
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 :-
:-
In the manufacture of finely pulverised substances for use in the production of
Portland cement, pigments, and the like, applying apparatus such as is described in
my Patent Specification, No. 21292 of 1893, but having combined with the other
parts a rotating sieve or screen arranged substantially as hereinbefore described.
Dated this Fifth day of June 1896.
EDMUND HUNT,
Applicant's Agent.