Improvements in Filter Press Plates.
Year: 1898

page_text: Improvements in Filter Press Plates.
We, GEORGE WILLIAM HOLMES, Engineer and Surveyor, Town Hall, Waltham-
stow, and JOHN FIELDHOUSE, Engineer, 77, Clacton Road, Station Road,
Walthamstow, do hereby declare the nature of this invention to be as follows:-
To form on each side of the rim of the plates of the filter press, projections
corresponding with similar projections on the adjoining plates, head & follower
of the press so that when the series of plates are screwed tightly together with the
cloth covering the surfaces of the plates, these projections shall bear against each
other & form a continuous resisting stay. The projections are so formed on each
side of the plates to receive a screw clip for holding the cloth firmly against each
side of the plate.
.
Dated this 20th day of Anril 1898.
GEORGE WILLIAM HOLMES, and
JOHN FIELDHOUSE.
CUMILELE DIUITIATION
Improvements in Filter Press Plates.
We, GEORGE WILLIAM HOLMES, Civil Engineer and Surveyor, of the Town Hall,
Walthamstow, in the County of Essex, and JOHN FIELDHOUSE, Engineer, also of
Town Hall, Walthamstow, and of 77, Clacton Road, Station Road, Walthamstow
aforesaid, 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;
This invention relates to filter press plates of the kind having corresponding
projections on the filtering or drainage faces which together with similar and
corresponding projections on the head and follower of the press form a continuous
resisting stay preventing the deformation or collapse of the plates during the
operation of pressing.
In such press plates as heretofore constructed the projections have been so placed
that the press cloths lie over them and between the projections on contiguous
plates so that the cloths are liable to be broken by the pressure of the sludge when
forced in, and furthermore the projections take up an appreciable amount of the
filtering or drainage surface of the plate.
The object of our invention is to construct filter plates with projections which are
so located as to obviate the disadvantages herein before referred to, and which at

page_text: the same time are so made as to provide means whereby the filtering cloths can be
securely and quickly connected to the plates.
In the accompanying drawings Fig. 1 is an elevation of part of a filter plate
constructed according to our invention and Fig. 2 is a vertical section of Fig. 1.
Fig. 3 is an enlarged elevation showing part of a cloth secured to a filter press
plate and Fig. 4 is a section taken on the line 4 4 of Fig. 3 and showing two such
plates fitted together; Fig. 5 is a detached elevation of the means for fastening
the cloth to the plate and Fig. 6 is a section taken on the line 66 of Fig. 5. The
same letters of reference where they occur are used to denote the same or correspond-
ing parts in the several figures.
According to our invention we provide the plate A with a central boss a which
extends slightly beyond the face of the plate on each side thereof and whose
exterior walls al are practically perpendicular to the surfaces of the plate.
Adjoining the exterior wall a¹ on each side of the plate is a concentric groove a²,
see Figs. 2 and 4, and disposed around the boss are three or other suitable number
of lugs or projections B which project beyond the surface of each side of the plate
as shown in Figs. 2 and 4. These lugs or projections B are provided with ears b
which partially overlap the grooves a² on each side as shown in Fig. 1, said ears
being formed on their under sides, that is to say, the sides nearest the grooves a², with
similar circumferentially inclined faces. The inclines may be otherwise arranged
as found suitable and convenient. A ring C, having correspondingly inclined
annular pieces c and recesses c¹ corresponding in position and size to the lugs B,
is provided for securing the cloth to the plate. Two of these rings are used for
each plate one on each side. One of these rings is shown detached in Figs. 5 and 6
and the method of securing the cloth D to the plates is as follows. (See Figures 3
and 4.) The cloth, having holes in it corresponding to the central aperture in the
plate, is placed in position with the edges of its hole lying around the exterior
wall of the boss a. The ring C is then placed in position with its recesses c¹
over the lugs B and pressed down towards the circular groove a² jamming the
cloth down under it. The ring C is then rotated (c² are small knobs or the like
for that purpose) bringing the thin edges of the tapering or inclined annular
pieces c under the overlapping ears of the lugs B; further rotation of the
ring C causes the inclined faces on B and C to ride on one another and jam
the cloth D tightly down into position in the groove a² thus effecting a tight
joint which in conjunction with the central boss a will prevent the sludge, by a
the pressure with which it is forced through the central hole in the plate, from
being forced between the plate and the cloth.
It will be seen that, when the press is screwed tightly up, the lugs or projections B
on each plate press against the lugs on the next and so on, the end plates press-
ing against corresponding lugs formed on the head and follower of the press. 4
In this manner we provide the press plates with a continuous resisting stay, with-
out the risk of damaging the cloth by the parts of said stay when tightened up,
without appreciable diminution of the effective filtering or drainage area, and
at the same time we utilize the parts of said continuous resisting stay to assist in
securing the cloths to the plates.
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:-
4
1. A filter press plate having a projecting central boss and a concentric groove
on each side of the plate adjacent to said boss, lugs around the boss projecting 5
beyond the surfaces of the plate and having inclined under faces, and a separate
ring having recesses corresponding to said lugs and inclined pieces to engage
the inclined parts of the lugs, substantially as described with reference to the
accompanying drawings and for the purposes stated.
2. A filter press plate with stay pieces arranged around the central aperture 5
and having inclined faces, and a separate piece with similar inclines to detachably

page_text: grip the cloth to the plate around the central aperture substantially as described
with reference to the accompanying drawings.
3. A filter press plate having in combination means for staying the plates when
arranged in a battery in the press and means for securing the filtering cloths
to the plates with the aid of the stay pieces substantially as described.
4. A filter press plate constructed and arranged substantially as and for the
purpose herein before set forth and illustrated in the accompanying drawings.
Dated this 14th day of December 1898.
F. W. GOLBY,
36, Chancery Lane, London, W.C.,
Patent Agent for the Applicants.