Year: 1886

page_text: Date of Application, 22nd Nov., 1886.
Complete Left, 22nd Aug., 1887.
Complete Accepted, 23rd Sept., 1887.
We JOHN ELIOT HODGKIN of 63 Queen Victoria Street in the City of London,
Engineer and EDWARD PERRETT of 8 Victoria Chambers, in the City of Westminster,
Engineer do hereby declare the nature of this invention to be as follows :-
This Invention more particularly relates to that class of Filter which is used for
the filtration of hard water that has been softened by the addition of lime or other
substances, and it consists of a series of metal discs or plates, solid for the greater
part of their diameter, with corrugated or roughened surfaces, fixed on a hollow
spindle and covered with filter cloth. This spindle may be horizontal or vertical as
preferred, and is set in a tank into which the water to be filtered is brought. The
water passing through the cloth becomes filtered, and is conducted by radial passages
on the discs to the hollow portion of the discs and thence escapes by the hollow
spindle.
When the spindle is vertical and it is desired to clear the cloth covering the discs,
the spindle is caused to rotate and jets of water, say from a pipe suitably arranged at
the side of the vessel, are directed upon the filter cloth, which wash off the lime
deposit.
When the spindle is horizontal there is formed upon it an enlarged part, having
socket holes into which a lever may be placed to turn the discs round if required, the
lime deposit being washed off by a jet of water from above. In these two cases when
it is desired to renew the filter cloth the spindle with the discs has to be lifted from
the tank.
In some cases in order to avoid the lifting of the spindle when it is necessary to
renew the cloths, the spindle is set upon a pair of trunnions and an equal number of
discs are placed fore and aft these trunnions, so that when desired either end of the
spindle with its discs can be easily raised enabling the cloth to be readily removed
and replaced.
The cloth may be in one or two long bags tied in between the adjacent discs so as
to completely cover the discs.
1000
THOS. J. HANDFORD,
50, Bedford Row, London, W.C.,
.Agent.

page_text: We JOHN ELIOT HODGKIN of 63 Queen Victoria Street in the City of London,
Engineer and EDWARD PERRETT of 8 Victoria Chambers, in the City of Westminster,
Engineer, do hereby declare the nature of this invention and in what manner the
Bame is to be performed, to be particularly described and ascertained in and by tho
following statement:-
This Invention more particularly relates to that class of filter which is used for the
filtration of hard water that has been softened by the addition of lime or other
substances, and it consists of a series of metal discs or plates solid for the greater
part of their diameter, with corrugated or grooved surfaces, fixed on a hollow spindle
and covered with filter cloth. This spindle may be horizontal or vertical as preferred
and is set in a tank into which the water to be filtered is introduced. The water
passing through the cloth becomes filtered and is conducted by radial passages on the
discs to the hollow portion of the discs and thence escapes by the hollow spindle.
When the spindle is vertical and it is desired to clean the cloth covering the discs,
the spindle is caused to rotate and jets of water, say from a pipe suitably arranged
at the side of the vessel are directed upon the filter cloth, which wash off the lime
deposit.
When the spindle is horizontal there is formed upon it an enlarged part having
socket holes into which a lever may be placed to turn the discs round if required the
lime deposit being washed off by a jet of water from above.
In the two cases before mentioned when it is desired to renew the filter cloth the
spindle with the discs has to be lifted from the tank. In some cases in order to avoid
the lifting of the spindle when it is necessary to renew the cloths, the spindle is set
upon a pair of trunnions and an equal number of discs are placed fore and aft these
trunnions, so that when desired either end of the spindle with its discs can be easily
raised enabling the cloth to be readily renewed. This arrangement also facilitates the
cleaning of the filter cloth.
The cloth may be in one or two long bags tied in between the adjacent discs so as
to completely cover the discs.
And in order that the said Invention may be perfectly understood we shall now
proceed more particularly to describe the same and for that purpose shall refer to the
several figures on the accompanying sheets of drawings, the same letters of reference
indicating corresponding parts in all the figures.
Figure 1 (sheet 1) of the accompanying drawings represents a sectional elevation
of a filter constructed according to one modification of this Invention in which the
hollow spindle hereinbefore referred to is arranged vertically, Figure 1" is a sectional
plan taken along the line 1-2 (Figure 1) shewing the central portion of one of the
metal discs composing the filter, and Figure 2 is a longitudinal section drawn to a
larger scale also of a portion of one of the discs.

page_text: Figure 3 (sheet 2) is a longitudinal vertical section of a filter constructed
according to another modification of this Invention in which the hollow spindle is
arranged horizontally, Figure 4 is a sectional plan and Figure 5 a sectional elevation
of the same.
Figures 6, 7 and 8 (sheet 3) illustrate another modification of this Invention in
which the hollow spindle is arranged horizontally as in Figures 3, 4 and 5, but the
parts are otherwise modified, Figure 6 being a longitudinal section of the filter with
a portion of each metal disc in elevation, Figure 7 a sectional plan and Figure 8 a
transverse vertical section of the same.
Referring first to Figures 1 1 and 2, A, 'A are the metal discs which compose the
body of the filter. A portion of one of these is shewn drawn to a large scale in
Figure 2. It is cast or otherwise formed solid (in contradistinction from being made
of thin plates put together) with a hollow space or chamber a open at the centre b,
with circular grooves c extending round the side face of each disc, forming corrugated
or grooved surfaces, and with radial channels (shewn clearly at c' in Figure 2 and
also in Figure 5 to be presently described) having openings d therein communicating
with the hollow space or chamber a. A suitable number of these discs are mounted
one above the other on the hollow spindle B which is supported and guided in
bearings e e¹ in the tank so as to be capable of rotary inotion, and is provided with
a flange or shoulder f near its lower end for receiving the lowermost disc and with a
screw thread above with which engages a nut g for tightly screwing up the series of
discs A, a small disc being interposed at hand i if required. The series of discs A is
covered with filter cloth (as shewn at k on the right hand side of Figure
presently described.) The cloth may be in one or two long bags tied in between the
adjacent discs so as to completely cover the discs. The water to be filtered is intro-
duced into the tank C at D, and passing through the cloth, becomes filtered and is
conducted by the radial passages c¹ on the discs, and the openings d to the hollow
space or chamber a and thence through openings 661 to the hollow spindle B, whence
it escapes by a pipe or passage 1, the passages 6 (see Figure 1) serving to place the
whole series of discs in intercommunication and thus ensuring free egress for the
water.
to be
During the process of filtration the filter is stationary; when however it is desired
to clean the filter cloth, the spindle is caused to rotate by means of bevel gearing E E¹
operated by a shaft F and handle G or other suitable means and jets of water at m
from a pipe m' are directed upon the filter cloth which wash off the lime deposit; the
water containing the impurities washed off from the cloth being conducted away by a
pipe H.
In the modification illustrated by figures 3, 4 and 5 the discs A are constructed
and arranged in a similar manner to that herein before described with reference to the
modification Figure 1, but are mounted on a horizontal hollow spindle B in lieu of a
vertical one as in Figure 1, the discs being maintained in intimate contact with each
other at their central portion by nuts g g.
The discs A are represented on the right hand side only of figure 4 as being
covered with filter cloth but it should be understood that the whole of the discs A in
all the modifications of this Invention are intended to be so covered, the cloth being
for the sake of clearness omitted from the drawings in most cases. The radial
channels on the face of the discs are shewn at c¹.
In the centre of the hollow spindle B there is an enlarged part n having socket
holes o into which a lever may be placed with which to turn the discs round when
required.
The operation of filtration takes place in the manner hereinbefore described with
reference to Figure 1, the outlets for the filtered water leaving the hollow spindle B,
being at 11.
When it is desired to clean the filter cloth, the discs A are turned round by means
of a lever inserted in the socket holes o of the enlarged part n of the spindle, and the
lime deposit is washed off by a jet of water from above, the water containing the
impurities removed being discharged at H.

page_text: In apparatus constructed according to the two modifications hereinbefore described,
when it is desired to renew the filter cloth the spindle with the discs have to be lifted
from the tank.
In order to obviate the lifting of the spindle when it is necessary to renew the
cloths the modification illustrated in Figures 6, 7 and 8 may be adopted.
In this case the hollow spindle B is carried upon a pair of hollow trunnions 1
mounted in bearings e¹ e¹ in the tank, the interior of the trunnions communicating
with the interior of the hollow spindle; and an equal number of discs A are placed
fore and aft these trunnions so that when desired either end of the spindle with its
discs can be easily raised enabling the cloth to be readily renewed.
The operation of filtration takes place as before, the filtered water escaping from
the hollow spindle through the hollow trunnions to the passages 11 and thence by the
outlets p p.
When it is desired to clean the filter cloth, the system of discs is turned and the
deposit is washed off by a jet of water such for example as from a hose the water
containing the impurities being discharged at H.
Having now particularly described and ascertained the nature of the said Invention
and in what manner the same is to be performed, we declare that what we claim is :-.
1. A filter consisting of a series of metal discs or plates, each cast or otherwise
formed solid, with surfaces, conduits and internal chamber, substantially as set forth,
the discs or plates being fixed on a hollow spindle and covered with filter cloth, and
the whole mounted in a tank into which the water to be filtered is introduced,
substantially as hereinbefore described.
2. The combination with the spindle and system of discs or plates, of means of
rotating or turning the same for the purpose of enabling the filter cloth covering the
discs or plates to be more readily cleaned, substantially as hereinbefore described.
3. Mounting the spindle with its system of discs or plates on trunnions, so as to
facilitate the renewal and cleaning of the filter cloth, substantially as hereinbefore
described.
Dated this Nineteenth day of August 1887.
THOS. J. HANDFORD,
50, Bedford Row, London, W.C.,
Agent.