Improvements in or relating to Filters.
Year: 1892

page_text: Date of Application, 4th May, 1892
Complete Specification Left, 4th Feb., 1893-Accepted, 1st Apr., 1893
PROVISIONAL SPECIFICATION.
Improvements in or relating to Filters.
I, WILLIAM EDWARD CADDELL, of 70, Mark Lane, in the City of London,
Merchant, do hereby declare the nature of this invention to be as follows:-
This invention relates to the cleansing of the filtering medium without the
necessity for removing it or disorganising the apparatus in any way. The inven-
tion will be applied to various descriptions of filters but is particularly applicable
to Kieselguhr cylinders, tubes and the like whether placed in large tanks or small
receptacles.
In carrying out the invention I employ one or more rings or equivalent adapted
to surround the filtering medium, the rings being preferably provided with bristles
or the like, which touch and secure the surface of the filtering medium as the
brushes or equivalent are moved around or upon it. Conveniently where cylinders
are arranged vertically in a tank a suitable frame may be placed around each
cylinder and may carry the required number of rings or brushes which may be
reciprocated vertically upon the filtering cylinder. The frame would be connected
in any convenient manner with suitable mechanism within or without the tank but
adapted to be operated from outside the tank; for example, the rods may commu-
nicate with eccentrics carried upon a shaft which may be operated by hand or
power so as to reciprocate the brushes and thus attain the result without interfering
with the operation of the filters or having access to the interior of the cistern.
If the brushes or equivalent are required to rotate around the filtering cylinder
the brushes would be straight and arranged parallel with the longitudinal axis of
the cylinder and the frame instead of being reciprocated would be revolved the
rotary movement being conveniently imparted by means of bevel gearing instead of
the eccentrics previously described.
Dated this 4th day of May 1899
W. P. THOMPSON & BOULT,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in or relating to Filters.
I, WILLIAM EDWARD CADDELL of 70 Mark Lane, in the City of London,
Merchant, 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 the cleaning of the filtering medium without the
necessity for removing it or disorganising the apparatus in any way. The inven-
tion will be applied to various descriptions of filters but is particularly applicable
to Kieselguhr cylinders, tubes and the like whether placed in large tanks or small
receptacles.
In carrying out the invention I employ one or more rings or equivalent adapted
to surround the filtering medium, the rings being preferably provided with bristles
or the like, which touch and scour the surface of the filtering medium as the
brushes or equivalent are moved around or upon it. Conveniently where cylinders
are arranged vertically in a tank a suitable frame may be placed around each
cylinder and may carry the required number of rings or brushes which may be
reciprocated vertically upon the filtering cylinder. The frame would be connected

page_text: in any convenient manner with suitable mechanism within or without the tank but
adapted to be operated from outside the tank; for example, the rods may commu-
nicate with eccentrics carried upon a shaft which may be operated by hand or
power so as to reciprocate the brushes and thus attain the result without interfering
with the operation of the filters or having access to the interior of the cistern.
If the brushes or equivalent are required to rotate around the filtering cylinder
the brushes would be straight and arranged parallel with the longitudinal axis of
the cylinder, and the frame instead of being reciprocated would be revolved, the
rotary movement being conveniently imparted by means of bevel gearing instead of
the eccentrics previously described.
In the accompanying drawings
Figure 1 is a view of a filter with my improved cleansing apparatus applied
thereto the casing and other connected parts being shown in vertical section and
the filtering medium in elevation, and
Figure 2 a horizontal section taken on line 2-2 of Figure 1 but with the filtering
medium in plan.
Like letters indicate like parts throughout the drawings.
The filter to which in the accompanying drawings my invention is shown as
applied comprises a casing A having a floor A' slightly above its lower end, two
lateral nozzles A to one of which may be fitted the water supply pipe provided if
desired with a suitable cock or equivalent and the other may be closed by a screwed
cap or cover F which when the filter is being cleaned may be removed to allow the
dislodged impurities to flow freely out of the filter; or this second nozzle A³ may,
instead of having the cap F, be fitted with a draw off cock. The filter comprises
a lid or cover A³ which tightly closes the upper end of the casing A to which it is
secured preferably by winged bolts B, and the filtering medium C preferably
Kieselguhr in the form of cylinders, but which may be of other material and shape,
for example asbestos cloth stretched on a suitable frame may be employed.
In the accompanying drawings there are shown three filtering cylinders or
blocks C (but there may be only one or any other desired number) each of which
is secured to the floor A¹ by a nut C¹ screwing on the nozzle C which extends
through the floor and through which the filtered water leaves the filter. Each of
the nozzles C¹ is connected with a filtered water delivery pipe which may be
common to all the filters or each may be connected with a pipe distinct from those
connected with the other nozzles C¹.
The cover A³ is provided at its centre with a stuffing box A through which a
conveniently tubular rod D is capable of being raised and lowered by means of the
handle D or other equivalent means such for example, in large apparatus, an
eccentric rotated by hand or power.
To the lower end of the rod D is secured a frame E having a number of prefer-
ably spring rings E' corresponding with the number and shape of filter blocks C.
Each of these rings is provided with a scouring or cleaning medium E³ which may
consist of bristles forming as it were an annular brush or of any other suitable
material such as cotton or other fibres which may be wrapped around the ring E'.
In the arrangement shown in the accompanying drawings the frame E is secured
to the lower end of the tubular rod D by means of a nut D' which screws on the
lower end of the rod D³ on whose upper end is rigidly secured the handle D' and
which passes completely through D; but although this may be a convenient manner
of constructing the reciprocating brush or cleaning-medium-carrier yet other means
may be substituted therefor.
Each ring E' is split or divided at E³ and its ends tend to press inwards so that
it may closely surround the filter block C and press the cleaning medium well
against the surface of C.
When it is desired to clean the before described filter the frame E by means of
the handle D¹ is moved up and down so that the cleaning medium E³ brushes off or
removes the impurities from the surface of the filter blocks C, these impurities
being at the same time removed from the filter by the appropriate nozzle A³ being

page_text: opened either by the opening of the before mentioned draw off cock attached to it
or removal of the screwed cap F.
The before described apparatus may be modified without departing from the
spirit of the invention for example instead of the cleaning brushes or equivalent
being reciprocated in the direction of the length of the filter blocks C they may
be arranged so as to rotate around them, the brushes under such construction being
preferably straight and arranged parallel with the longitudinal axes of the blocks,
the rotary movement being imparted by means of bevel or equivalent gearing.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. The combination with a filter of a filter cleaning device adapted to be operated
from the outside without the operator having access to the interior.
2. In a filter the combination with the filtering medium of a brush or equivalent
cleaning device arranged so that from the exterior of the filter. said device may be
moved in contact with the filtering surface for the purpose of scrubbing or cleaning
the latter.
3. In a filter the combination with a filter block of a brush or cleaning device
such as E E substantially as described and illustrated in the accompanying
drawings.
4. The combination and arrangement of parts constituting the complete filter-
medium cleansing device substantially as described and illustrated in the
accompanying drawings.
D
1 1
.
1000
W. E. CADDELL.
W. P. Thompson & Boult,
Agents for the Applicant.