AN IMPROVED POTTERS FILTER PRESS
Year: 1887

page_text: Date of Application, 8th Feb., 1887.
Complete Left, 19th Apr., 1887.
Complete Accepted, 20th May, 1887.
JOHN CRITCHLOW, Engineer, Phoenix Works, Longton, Staff. THOMAS FORESTER,
WILLIAM FORESTER, HERBERT FORESTER, and LEONARD FORESTER, Earthenware
Manufacturers, Phoenix Works, Longton and Falcon Works, Hanley, do hereby
declare the nature of our invention for AN IMPROVED POTTERS FILTER PRESS, to be
as follows:
Our invention has for its object an improved potters filter press. The present
method adopted by potters for filtering "stop" or "slip," is to force the liquid into a
cloth bag or receptacle contained in a grooved chamber, the solid particles being
arrested, while the liquid escapes through apertures provided for it. The great
objection to using these presses is the expense and annoyance caused by the frequent
failures and renewals of the cloths, which are severly strained by the pressure required
for the operation. It is for improvements in these directions that our invention is
directed. Our invention consists in constructing a press of inetal or other suitable
material, and designed to do without cloths as the filtering medium; using a porous
composition instead.
1
1007
BILLINGTON & NEWTON,
Agents for Applicants.

page_text: JOHN CRITCHLOW, Engineer, Phoenix Works, Longton, Staff. THOMAS FORESTER,
WILLIAM FORESTER, HERBERT FORESTER, and LEONARD FORESTER, Earthenware
Manufacturers, Phoenix Works, Longton, and Falcon Works, Hanley, Staff. 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
Our invention has for its object an improved potters filter press.
The present method adopted by potters for filtering "stop" or "slip" is to force
the liquid into a cloth bag or receptacle contained in a grooved chamber, the solid
particles being arrested, while the liquid escapes through apertures provided for it.
The great objection to using these presses is the expense and annoyance caused by the
frequent failures and renewals of the cloths, which are severly strained by the pressure
required for the operation. It is for improvements in these directions that our
invention is intended.
Our invention consists in constructing a press of metal or other suitable material,
and designed to do without cloths as the filtering medium, using a porous composition
instead.
The annexed drawings shew a method of carrying out our invention, the same
letters refering to the same parts in each figure. Fig. 1 is a front view. Fig. 2 is a
side view with one tray shewn in section.
The tray A which is constructed with arms K. K to hold and support it in a
suitable frame I, consists of a ring forming two recesses separated by a web or
disc E, cach side of said web or disc being provided with small grooves B. B running
from top to bottom.
We then place a porous composition C in the recesses over the grooves, and, at the
same time leave sufficient space F between the surfaces of the compositions of the
adjacent trays, to permit a layer of clay of the required thickness to form and be
contained therein. Any convenient number of these trays may be used at one time,
and, in order that they may joint together, one face of each tray is provided with a
groove, the other face being formed to fit into a corresponding groove in the next
tray, cach joint being made by a suitable elastic ring placed in the groove, all the
trays being pressed and held together by means of a screw D, such an arrangement
being shewn in the drawing. Each tray is provided with a feed pipe G at the top,
formed to joint in a similar manner, and at the same time as the trays; and for the
escape water the apertures H are provided which connect with the before named
grooves in the web or disc, discharging the water into trough I from which it may be
conducted to any convenient place by pipe J.
The construction of our improved press having been above described, we will now
proceed to explain the manner in which it is operated
After the trays have been pressed together by screw D in order to make the joints

page_text: tight, the "slop" or "slip" as it is termed, is forced through the feed pipe G into
the chamber formed between the compositions as shown at section of one tray Fig. 2,
and when all the trays are full, the pressure accumulates and forces the liquid portion
of the "slip" or "slop" through the porous composition, leaving a cake of the solid
portion or clay in the chamber. When the water ceases to flow from the outlet
holes II, it indicates that the filtering is complete; the trays are then released from
the pressure of the screw, separated and the cake of clay removed, the same process
being repeated each time.
The before mentioned porous composition, we preferably make of Charcoal, Blue
Clay, Ball Clay, China Clay, Flint and stone all mixed together in proportions to suit
the kind of clay required, formed into cakes and fired.
We would also have it understood that we do not confine ourselves to the exact
details of construction hereinbefore mentioned, neither do we confine ourselves to the
exact ingredients of the porous composition, as the same admit of modification
without departing from the essential features of our invention.
Having now particularly described and acertained the nature of our said invention,
and in what manner the same is to be performed, we declare that what we claim is
The application of a porous composition as a filtering medium for potters filter
presses.
BILLINGTON & NEWTON,
Agents for Applicants.