Year: 1888

page_text: Date of Application, 8th Feb., 1888
Complete Specification Left, 8th Nov., 1888
Complete Specification Accepted, 14th Dec., 1888,
We, JAMES ARTHUR DRAKE, and RICHARD MUIRHEAD, both of Maidstone, Kent,
Mechanical Engineers, do hereby declare the nature of this invention to be as
follows:-
According to the present method of arranging plates in Filtor presses, the pressure
exerted in pinching them close up in the press by means of a screw, causes the
extraction of the liquid portion to be checked or seriously impeded when the plates
have become partially charged with the caking body, so that imperfect cakes have been
and are produced. Now the object of our present invention is to obviate this incon-
venience, and for this purpose we cut, or otherwise form a series of notches, or slots
radially or otherwise round the periphery of the division or distancing rings and on
either side of the same crossing the notches or slots we may form an annular groove
common to all of them, the base of the slots or notches terminale just within where
the annular groove is situate and from this point to the inner periphery of said
division or distancing rings we taper or incline the face either continuously all round
or at intervals.
When the plates with the cloths on them, as in some presses, or with the coir rope,
mat or other surfacing as in our previous Patent No. 10143 of 1885 the pinch of the
plates comes upon that part of the face which is beyond where the annular groove
exists, if one be formed, so that the cloth, or the rope, or coir mat, or other filtering
fabric only touches the tapered or inclined portion of the division or distancing frame
or ring as not to impede passage of the liquid to the innermost ends of the slots or
notches whereby the passage of the liquid is always permitted whether the space
between the plates be completely charged or only partially charged.
By this means we can make perfect solid cakes at every charging of the press.
Instead of the division or distancing rings being formed as above set forth the plates
themselves may be so shaped or prepared that the same effect as that before described

page_text: may be obtained, and instead of the plates having the mat coir, canvas, or other
conting on the outside surface or surfaces, it may be on the inner face, or between two
plates (perforated meshed or otherwise) distanced by blocks, the space between being
rammed tight with coir, or rope, in fibro if desired or rolled or reeled in.
Dated this 8th day of February 1888.
H. GARDNER,
166, Fleet Street, London,
Agent for the said Jaines Arthur Drake
and Richard Muirhead.
Improvements in or Connected with Filter Presses.
We JAMES ARTHUR DRAKE and RICHARD MUIRHEAD, both of Maidstone, Kent
Mechanical Engineers, do hereby declare the nature of our said invention and in
what manner the same is to be performed to be particularly described and ascertained
in and by the following statement :-
According to the present method of arranging plates in Filter Presses, such as aro
described in our previous Patent No. 101438 the pressure exerted in pinching
them close up in the press by means of screw or other mechanical means causes the
extraction of the liquid portion to be checked or impeded when the plates have become
partially charged with the caking body so that imperfect cakes are sometimes
produced.
Now the object of our present invention is to obviate this inconvenience and for this
purpose we cut or otherwise form a series of notches or slots a radially or otherwise
round the periphery of the division or distancing rings H, H, as at Figure 1 of the
annexed drawings and on either side of the same, crossing the notchos or slots a we
may form an annular groove & common to all of them, the base of the slots or notches a
terminate just within whore the annular groove b is situate and from this point to the
inner periphery of said division or distancing rings H wo taper or incline the face
either continuously all round or at intervals.
When the plates B with cloths A on them as in some presses or with the coir, rope,
mat or other surfacing as in our previous Patent No. 10143 of 1885, the pinch of the
plates B comes upon that part of the face of the ring which is beyond where the
annular groove b exists, if one be formed, so that the cloth or the rope or coir,
mat or other filtering fabric only touches the tapered or inclined portion of the
division or distancing frame or ring H lightly so as not to impode passage of
the liquid to the innermost ends of the slots or notches a whereby the passage

page_text: of the liquid is always permitted whether the space between the plates be completely
charged or only partly charged.
By this means we can make perfect solid cakes at every charging of the press.
Instead of the division or distancing rings H being formed as above set forth the
plates B themselves may be so shaped or prepared that the same effect as that before
described may be obtained (this will be understood by reference to Figures 2 and 3
of the annexed drawings), and instead of the plates B having the mat, coir, canvas or
other coating on the outside surface or surfaces it may be on the inner face or between
two plates B, B, (perforated, meshed or otherwise) distanced by blocks c as at
Figure 4 of the annexed Drawings which is a half sectional perspective view, the spaces
between the blocks c and the centre eyed being rammed tight with coir or rope, in
fibro if desired, or rolled or reeled in and with spaces between the blocks c, c, for the
passage of the filtrate exuding from the mat, coir, canvas or other lining.
I, I, are the overlapping flanges or projections which prevent the filtrate from being
squirted out and for leading it into a channel.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
claim is
1. The construction of distancing rings arranged between the filtering plates of
Filter Presses with notches or grooves a formed radially or otherwise for the purpose
described.
2. Forming the plates which hold the cloth or other covering as a filtering medium
in Filter Pressos with radial or other slots or grooves a as and for the purpose
described.
3. Forming the distancing rings H with inclined faces which bear lightly against
the cloth or other covering used as the filtering medium and attached to the plates of
Filter Presses the nip of the cloth being at that part of the ring, or of the plate, where
the notches or grooves are formed so as not to interfere with the passage of the filtrate
from the material under operation as described and substantially as shown by the
annexed drawings.
4. The combination plates shown at Figure 4 of the annexed drawings composed of
two plates holding between them a filtering medium and with blocks c, c, to maintain
the position of the periphery of the plates B, B, and having intervening spaces for the
passage of liquid while leaving the filtering medium, substantially in the manner
described.