Improvements in Sifters and Mixers.
Year: 1895

page_text: Date of Application, 18th Jan., 1895
Complete Specification Left, 17th Oct., 1895-Accepted, 23rd Nov., 1895
Improvements in Sifters and Mixers.
I, WILLIAM GARDNER, of the Firm of William Gardner & Sons, Milling
Engineers, of Bristol Road, Gloucester, in the County of Gloucester, do hereby
declare the nature of this invention to be as follows:-
The present invention relates to improvements in the sifter and mixer described
and claimed in the Specification of my prior Patent No. 10606 dated 1st July 1889.
The first improvement consists in jacketting the lower portion of the casing in
which the agitator or helical mixer is caused to revolve, so that the materials
contained in such casing may be subjected to heat for the purpose of driving off
moisture therefrom when necessary. Such jacket may have a continuous circulation
of hot water or other heating medium caused to pass therethrough. I may also
place oils or other substances in this jacket to obtain a higher temperature than
the boiling point of water would give without there being a continuous circulation
through the jacket. I may further arrange a gas burner or other suitable heating
appliance below the jacket for the purpose of maintaining the heating medium
contained therein at the desired temperature. A thermometer is preferably fitted
to the jacket for the purpose of indicating the temperature of the heating medium,
so as to enable same to be regulated at will. A steam escape pipe is also preferably
fitted to the jacket.
A
The second part of my improvements consists in the addition of a finely perforated
pipe or tube fitted above the mixer, and under the sifter and brush, so that when
necessary I may supply any desired quantity of liquid to the powder or material.
This will enable me to supply any desired liquid or essence to the sifted material
during the process of mixing. The above improvements are applicable to the
mixer no matter whether same is used alone or is combined with the sifter.
further improvement in the sifter consists in making the whole of the outer end of
the casing or sieve in which the sifting brush revolves communicate with an outlet,
so that any material which will not pass through such sieve will be continuously
delivered by the brush into such outlet from the whole surface of the sieve, and
the latter will thus be prevented from becoming choked by such unsifted material.
The adjustable bearing which regulates the adjustment of the sifting brush in the
sieve is mounted in the outlet above described.
Another improvement in the sifter relates to the mechanism by which the powders
are supplied from a hopper to the sifting brush and sieve chamber. This feed
mechanism has a shaking feed actuated by a cam on the sifting brush which acts
on a roller carried by a feed board hinged to one side of the hopper, such feed
board acting in conjunction with a plate secured to the opposite side of such hopper.
I now make this plate with slots or openings in its lower end and mount an adjust-
able plate on the former plate (pre'erably below same) so as to cover the slots or
openings therein to a smaller or greater extent, thus enabling the feed to be regulated
as required. By raising the adjustable plate the openings become larger and
admit powders more freely to the brush, while by lowering same such openings
become smaller and the powder will pass less freely to the brush. By this means
both lumps and fine powder find their way to the brush at the same time, while
without such means if the gate were opened wide enough to pass lumps through,

page_text: too much fine powder also passed and the brush and sieve chamber either became
choked or too much was caused to be passed over the sieve tail outlet spout.
Ta ahi 10th And of January 1895.
ALLISON BROS.,
Agents for the Applicant.
Improvements in Sifters and mixers.
I, WILLIAM GARDNER, of the Firm of William Gardner & Sons, Milling
Engineers, of Bristol Road, Gloucester, in the County of Gloucester, 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 :-
The present invention relates to improvements in the sifter and mixer described
and claimed in the Specification of my prior Patent No. 10606 dated 1st July
1889.
The present improvements are illustrated in the accompanying drawings, in
which
Fig. 1 is a transverse section, and
Fig. 2 a longitudinal section of a machine with the present improvements applied
thereto.
The first improvement consists in providing the lower portion of the casing A in
which the agitator or helical mixer B is caused to revclve with a jacket C, so that
the material contained in such casing may be subjected to heat for the purpose of
driving off moisture therefrom when necessary. Such jacket C may have a
continuous circulation of hot water or other heating medium caused to pass there-
through, and for this purpose one end may be provided with a suitable inlet c
and the other end with an outlet c¹. I may also place oils or other substances in this
jacket to obtain a higher temperature than the boiling point of water would give
without there being a continuous circulation through the jacket. I may further arrange
a gas burner or burners D supplied by pipe D¹, or any other suitable heating
appliance, below the jacket C for the purpose of maintaining the heating medium
contained therein at the desired temperature. A thermometer E is preferably
fitted to the jacket C for the purpose of indicating the temperature of the heating
medium, so as to enable same to be regulated at will. A steam escape pipe F is
also preferably fitted to the jacket.
When the apparatus is provided with a gas burner or burners D as shown, or
with any other suitable heating appliance for maintaining the heating medium
contained in the jacket C at the desired temperature, prefer to employ in
addition the outer jacket or flue C, which will have the effect of guiding the
products of combustion from the gas burners or other source of heat, and keeping
such products of combustion in contact with the jacket C, thus preventing waste
of heat and economizing the gas or other source of heat employed.
The second part of my improvements consists in the addition of a finely
perforated pipe or tube G fitted above the mixer B, and under the sifter and
brush H, so that when necessary I may supply any desired quantity of liquid to
the powder or material. This will enable me to supply any desired liquid or
essence to the sifted material during the process of mixing.
The above improvements are applicable to the mixer no matter whether same
is used alone or is combined with the sifter.
A further improvement in the sifter consists in making the whole of the outer
end of the casing or sieve I in which the sifting brush revolves communicate
with an outlet J, so that any material which will not pass through such sieve will

page_text: be continuously delivered by the brush into such outlet from the whole surface of
the sieve, and the latter will thus be prevented from becoming choked by such
unsifted material. The adjustable bearing K which regulates the adjustment of
the sifting brush H in the sieve I is carried by the outlet above described.
Another improvement in the sifter relates to the mechanism by which the
powders are supplied from a hopper to the sifting brush and sieve chamber. This
feed mechanism has a shaking feed actuated by cam h on the sifting brush H
which acts on a roller carried by a feed board L hinged at to one side of the
hopper M, such feed board L acting in conjunction with a plate N secured to the
opposite side of such hopper. I now make this plate N with slots or openings n in
its lower end and mount an adjustable plate O on the plate N (preferably below
same) so as to cover the slots or openings n therein to a smaller or greater extent,
thus enabling the feed to be regulated as required.
The plate O may be provided with a tail (such as shown at o) extending through
a slot in the side of the hopper M, or with any other suitable means for altering
the position of such plate O in relation to plate N, and it will be seen that by
raising the adjustable plate O the openings become larger and admit powders
more freely to the brush H, while by lowering same such openings become smaller
and the powder will pass less freely to the brush. By this means both lumps and
fine powder find their way to the brush at the same time, while without such
means if the gate were opened wide enough to pass lumps through, too much fine
powder also passed and the brush and sieve chamber either became choked or too
much was caused to be passed over the sieve tail outlet spout.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare what I
claim is :-
In a mixing apparatus either combined or not with a sifting apparatus
1. The combination with the chamber in which the mixing is effected of a
jacket through which hot water or other heating medium is caused to pass, or
which is heated by gas burners or otherwise, substantially as and for the purpose
specified.
2. The combination with the mixer mechanism of a perforated pipe or tube so
placed as to supply any desired liquid or essence to the materials being mixed,
substantially as and for the purpose specified.
In a sifting apparatus either combined or not with a mixing apparatus
3. Forming the outlet at the end of the casing or sieve in which the sifting
brush revolves so that the whole of the end of such brush or sieve is open,
substantially as and for the purpose specified.
4. The improved arrangement for supplying the material to the sifting brush
and sieve chamber, consisting in the employment of a shaking feed produced by
means of a cam on the sifting brush acting on a roller attached to a feed board
hinged to one side of the hopper, in combination with a plate attached to the
other side of the hopper and the lower end of which is made with openings, the
area of which openings is made adjustable by providing a plate adapted to be
moved so as to open or close same to a smaller or greater extent, substantially as
and for the purpose specified.
Dared this 10th day of Autahow 1005
ALLISON BROS..
Agents for the Applicant.