Year: 1886

page_text: Date of Application, 4th Sept., 1886.
Complete Left, 19th Apr., 1887.
Complete Accepted, 20th May, 1887.
I, ALEXANDER WILLIAM ANDERSON, of Ossory Road, Old Kent Road, in the
County of Surrey, Colour Manufacturer, do hereby declare the nature of this invention
to be as follows:-
This invention relates to improvements in that description of filter press which con-
sists of a number of timber or other frames with filter cloths placed at each side
thereof, and alternating with fluted boards or strainers, the whole being bolted or
otherwise held together in series. The liquid to be filtered is caused to pass into the
interior of these frames, and the solid matters are retained and accumulate therein,
the fluid passing away through the filter cloths and between the flutings or recesses
of the boards or strainers. When the frames are sufficiently charged with solid
matter, the fluted boards or strainers and the filter cloths are separated from them
and the said solid matter removed from the interior thereof. Before the frames can
be put together again these filter cloths have to be again applied to the sides of
the frames which has heretofore been done in various ways, all of which however
are more or less clumsy, involve great expenditure of time, are destructive to the filter
cloths themselves as well as to the frames, and involve a great deal of handling, and
in some cases, the production of a considerable quantity of dust, which, in the manu-
facture of white lead and other poisonous or deleterious materials, is very dangerous
and injurious to the health and lives of the workpeople.
The special object of this present invention is to reduce the manipulation and
handling of the filter cloths to a minimum, and to obviate to a great extent all the
beforementioned objections to the use thereof.
According to this invention, I employ filter cloths of any suitable material woven
or otherwise made into a tube or sack-like form, and I put the fluted board or strainer
into the said tube or sack-like filter cloth and attach the latter more or less permanently
to the former by nailing, or in any convenient manner, or I sew the unclosed ends
or edges of the filter cloth together. Each of the fluted boards or strainers thus
carries the filter cloth for two adjacent frames, which cloth need not be removed

page_text: from its fluted board or strainer until worn out; each of the said fluted boards or
strainers with its filter cloth being merely removed and placed on one side when
taking the press apart, and is always ready for replacement when the press is put
together again. I prefer to nail or otherwise attach a strip of felt or other packing
round each side of the frames so as to ensure a good joint between the fluted boards
or strainers and the said frames.
I form the passage from one frame to another in the fluted board or strainer and
place therein a short tube with a flange at one end and a washer and nut at the
other, the said flange bearing against the filter cloth, one side of the board, and the
washer against the filter cloth on the other side of the board, so as to hold the filter
cloth in place round the passage.

page_text: Improvements in Filter Presses.
I, ALEXANDER WILLIAM ANDERSON, of Ossory Road, Old Kent Road, in the
County of Surrey, Colour Manufacturer, 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, reference being had to the accompanying
two sheets of Drawings, and to the letters and figures marked thereon, that is to say :-
This invention relates to improvements in that description of filter press which
consists of a number of timber or other frames with filter cloths placed at each side
thereof, and alternating with fluted boards or strainers, the whole being bolted or
otherwise held together in series. The liquid to be filtered is caused to pass into the
interior of these frames, and the solid matters are retained and accumulate therein, the
fluid passing away through the filter cloths and between the flutings or recesses of
the boards or strainers. When the frames are sufficiently charged with solid matter
the fluted boards or strainers and the filter cloths are separated from them, and the
said solid matter removed from the interior thereof. Before the frames can be put
together again these filter cloths have to be again applied to the sides of the frames,
which has heretofore been done in various ways, all of which however are more or
less clumsy involve great expenditure of time, are destructive to the filter cloths them-
selves as well as the frames, and involve a great deal of handling, and, in some cases,
the production of a considerably quantity of dust which, in the manufacture of white
lead and other poisonous or deleterious materials, is very dangerous and injurious to
the health and lives of the workpeople.
The special object of my present invention is to reduce the manipulation and
handling of the filter cloths to a minimum, and to obviate, to a great extent, all the
beforementioned objections to the use thereof.
The Drawings hereto annexed represent filter frames, cloths, and boards con-
structed and arranged in accordance with my present invention. Figure 1 is a front
view of a filter frame in position against a filter board. Figure 2 is a section on
line X-X of Figure 1 through a series of frames, boards and cloths put together
ready for use. Figure 3 is a section of same on line Y-Y of Figure 2. Figure 4 is
a front view of a board showing the flutes and grooves in the face thereof and
Figure 5 is an enlarged partial section at the bottom ends of a filter frame and two
adjacent boards.
According to this invention I employ filter cloths A of any suitable material woven
or otherwise made into a tube or sack-like form; I put the fluted board or strainer B
into the said tube or sack-like filter cloth, and attach the latter more or less per-
manently to the former by nailing, as shown clearly in Figure 5, or in any other
suitable or convenient manner; or I sew the unclosed ends or edges of the filter cloth
together. Each of the fluted boards or strainers B thus carries the filter cloth A for
two adjacent frames C C, which cloth need not be removed from its fluted board or
strainer B until worn out. The said fluted boards or strainers with their filter cloths
are merely removed and placed aside when taking the press apart, and are always

page_text: ready for replacement when the press is put together again. I prefer to nail or
otherwise attach a strip of felt or other packing D round each side of the frames C
80 as to ensure a good joint between the plain parts of the fluted boards or strainers
and the said frames.
I form the passage E from one frame C to the next, in the fluted board or strainer B
between such frames, and place in such passage a short tube F with a flange G at one
end and a nut H screwed on at the other, a washer being interposed, if necessary,
between the nut H and the cloth A as shewn. The said flange G bears against the
filter cloth A on one side of the fluted board B, and the said washer or the nut H
against the filter cloth on the other side of the board B so as to hold the filter cloth in
place round the passage E.
The grooves I in the boards B terminate at their lower ends in channels K
connected by the passage J with the outlet hole L by which the expressed fluid is
conducted away to a receiver.below or otherwise.
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: -
-
First In filter presses of the kind hereinbefore described the use of filter cloths of
tube or sack-like form as hereinbefore described and illustrated in the Drawings
hereto annexed.
Second-In filter presses of the kind hereinbefore described the combination of a
fluted board or strainer with a filter cloth of tube or sack-like form as hereinbefore
described and illustrated in the Drawings hereto annexed.
Third In filter presses of the kind hereinbefore described the use of the tube F
passing through the opening in the fluted board or strainer B and filter cloth A and
having a flange G, a nut H and washer, as hereinbefore described and illustrated in
the Drawings hereto annexed and for the purposes specified.
Dated this 18th day of April 1887.
A. W. ANDERSON.
Per W. H. Beck,
115, Cannon Street, London, E.C.,
Agent.