Improvements in and relating to Filtering Apparatus.
Year: 1889

page_text: Date of Application, 18th Oct., 1889
Complete Specification Left, 18th July, 1890-Accepted, 30th Aug., 1890
PROVISIONAL SPECIFICATION.
Improvements in and relating to Filtering Apparatus.
1, RICHARD CHARLES GERVILLE of 11 Hermannstrasse, Hamburg, in the Empire
of Germany, Manufacturer, do hereby declare the nature of this invention to be as
follows:-
This invention relates to filtering apparatus and the object of the same is to provide
means for cleaning the surface of the filtering material by reversing the direction of
the liquid through the filtering substances, this being effected by a handle which
serves the purpose of either drawing off filtered or unfiltered liquid through the
filtering apparatus or of entirely stopping the supply of any such liquid.
To carry my invention into effect the filtering substances, forming a solid body are
placed within a casing in such a manner that two empty compartments are left at the
front and rear side of the casing. A tube which is cemented to the said filtering body
and extends through the front cover of the said casing, is adapted to receive two other
tubes fitting one into the other, the innermost one which is fastened to the rear cover
of the casing, is stationary as well as the one which is cemented to the filtering body
while the tube surrounding the innermost tube and fitting also into the outermost tube
may be rotated about their mutual axis. The outermost tube communicates at its rear
end with the supply pipe and also with a smaller pipe extending through the filtering
substances to the said compartment or chamber at the front end of the casing. The
aforesaid three tubes arranged one in another of which the innermost one serves as
discharge pipe, are provided at their circumference with a certain number of holes or
passages corresponding with one another in such a manner that by turning the middle-
tube gradually each time at about 90°, the innermost discharge-pipe is entirely put out
of or into direct communication with the supply pipe in which latter case the liquid
will be discharged unfiltered or it communicates either with the said front or rear
compartment formed in the casing by the filtering substances, in which cases the liquid
is conducted through the latter in one or the other way.
This arrangement of the said tubes and the manner of actuating the same is
particularly for the purpose of temporarily reversing the flow of the liquid through the
filtering substances whereby the impurities retained from the latter when conducting
the liquid in one way will be washed off by reversing the direction of the current.
The impurities thus washed off from the filtering material are thereby simultaneously
drawn off through the aforesaid innermost discharge pipes.
Dated this 18th day of October 1889.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in and relating to Filtering Apparatus.
I, RICHARD CHARLES GERVILLE, of 11 Hermannstrasse, Hamburg, in the Empire
of Germany, Manufacturer, 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 filtering apparatus and the object of the same is to provide
means for cleaning or rinsing ont the filtering mass, by reversing the direction taken
by the liquid in passing through it. This is effected by a cock having a hollow plug
and provided with an inner and outer casing, the peculiar construction of which

page_text: though the intering mass, for cleansing purposes, and lastly of entirely stopping the
supply of any such liquid by turning the plug into any one of the corresponding
positions.
In the accompanying drawings I have shown how my said invention may be
conveniently and advantageously carried into practice.
Figure 1 shows a front elevation of the filter;
Figure 2 a vertical transverse section;
Figure 3 a section on the line ab of Figure 2.
Figure 4 is a longitudinal section through the cock or tap showing the position of
the plug when reversing the direction of the liquid through the filtering mass.
Figure 5 is a similar view with the plug adjusted for drawing off filtered liquid,
Figure 6 also shows a similar view the plug being in position for drawing off
unfiltered liquid.
Figure 7 is a sectional view of the internal plug casing, forming the filter inlet
and outlet.
Figures 8 to 10 are detail sectional views of the same.
Figure 11 is a side elevation of the plug.
Figure 12 a longitudinal section.
Figures 13 to 15 detail sectional views of the same.
Figure 16 shows in longitudinal section the external plug casing and
Figures 17 to 20 show various detail sectional views of the same.
The filter casing B having cover B' shown in Figures 1, 2 and 3 of the drawing is
preferably circular and formed at B' for the reception of the cock which it partially
encases.
The filtering medium A is cemented into the filter casing and to the cock
at 3 (Figures 2 and 3) so as to leave spaces CC intervening between its front
and rear sides and the top and bottom of the casing and communicating with the cock
in the manner hereinafter described.
The cock consists of three parts; the tubular internal casing E forming the filter
inlet and outlet pipe and provided with the nozzle E' the outer or external tubular
casing F communicating by pipe F¹ with the front space C and the plug D having the
handle containing numbers 1, 2, 3, 4 denoting the various positions into which it
may be adjusted. The whole cock or tap is enclosed by the filter casing B' at the
bottom and sides, and by the cement fixing it to the filtering mass, from above in such
a manner as to leave the chamber C2 communicating with the rear space C₁ and (*
communicating with the front space C. The internal plug casing E is divided into
two distinct chambers by a partition Ex and is attached at its one end to the filter
inlet G whilst its other end projects through the plug and is provided with a nozzle E¹.
The plug is fitted tightly between its two casings by means of stuffing boxes and
glands H and F.
As shown in Figure 2 the plug is in position 1 and the filter outlet closed. The
liquid entering the filter at G passes into the inlet chamber (x of the internal casing E
upwards through the plug opening D² along pipe F¹ into the front space C then through
the filtering medium A into the rear space and chamber from whence it cannot
flow out as the openings F2 and E2 to the outlet, are closed by the plug D.
On turning the plug halt a turn, i.e. into position 2 (see Fig. 5) the filtered liquid
may be drawn off. In this case the opening D2 of the plug covers with that F³ of the
external casing F allowing the liquid coming from the filter inlet G to pass directly
into the chamber C thence on to the rear surface of the filtering medium which it
penetrates, entering the chamber C at the front end of the cock." But at the same
time as the plug inlet D2 is covering the orifice F³ of the external casing F, a second
opening D³ of the plug, was brought into position over hole F1 of the casing F, so that
the liquid, having been filtered may pass out of the chamber which is separated
from chamber (by cement C³ and an outer flange Fs of the external casing F through
the outlet hole Es out of the apparatus.

page_text: In order to reverse the direction of the liquid through the filter to clean or rinse out
the filtering medium the plug must be turned into position 3 (Fig. 4) here, the course
of the liquid is the same as in Figure 2, with the exception that a third outlet hole D'
in the plug corresponds with the orifices F2 of the outer casing and E' of the inner
one whilst a fourth opening D of the plug, situated diametrically opposite to D*
and 90° distant from D2 corresponds with the opening in the outlet pipe F¹ of the
external casing, allowing the scum to flow off at E¹.
Lastly if the plug be turned into position 4, the liquid may be drawn off direct
from the supply without entering the filter at all. When the plug is in position 4
(Figure 6) the holes D and D correspond with the orifices F3 respectively in the
external casing so that the liquid flows from the supply pipe & through D³ F³ and out
of the apparatus at De E¹.
It is obvious that I can also filter the liquid in the direction shown in Figure 4
instead of as described viz. :-that shown in Figure 5 but this is not advisable for the
following reason. After having drawn off unfiltered liquid (Fig. 6) the chamber (
will remain filled therewith as soon as the cock has been closed. If now filtered
liquid be required and the same be filtered through in the direction shown in Figure 4,
in passing through the chamber (it will mix with the unfiltered liquid which had
previously remained there, so that at the beginning a mixture of pure and unfiltered
liquid will run off.
I also wish it to be clearly understood that I can dispense with the orifices D³ Dª in
the plug thereby eliminating the unfiltered liquid outlet, so that the cock could only be
used to draw off filtered liquid or clean the filtering medium without in any way
departing from the nature of my invention.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed 1 declare that what
I claim is :-
First. In combination with a filter, a cock or tap arranged as specified to reverse
the direction of the liquid through the filtering substance for the purpose set
forth.
Second. In combination with a filter, a cock or tap adapted by adjusting the
position of the plug firstly to shut off the liquid supply entirely secondly to draw off
filtered liquid, thirdly to reverse the direction of the liquid through the filtering
medium substantially as set forth.
Third. In combination with a filter a a cock or tap adapted, by adjusting the position
of the plug, firstly to shut off the liquid supply, secondly, to draw off filtered liquid,
thirdly to reverse the direction of the liquid through the filtering medium and
fourthly to draw off unfiltered liquid direct from the supply, substantially as set forth
and shown.
Fourth. In combination with a filter casing B having the filtering medium A
cemented therein in such manner, as to form the front and rear chamber CC, a cock
or tap having, firstly, the hollow plug D, provided with the orifices D2 D3 D4,
secondly, the internal tubular casing E connected at one end with the supply pipe G
its other end forming the filter outlet, said casing having partition Ex and orifices as
specified thirdly an external casing F communicating by tube F with chambers C
and C and by orifices F3 and F with chambers (and the said cock or tap being
50 cemented to the filter and filtering medium as to form chambers C² and Call parts
acting in combination with each other in the manner and for the purposes substantially
as set forth.
Fifth. In combination with a filter casing B having the filtering medium A,
cemented therein in such a manner as to form the front and rear chambers C, Ca
cock or tap having firstly the hollow plug d provided with the orifices D2 D3 D4 D³ Do,
secondly, the internal casing E, connected at one end with the supply pipe G its other
end forming the filter outlet E' said internal casing having partition Ex and orifices
as specified, thirdly, an external casing F communicating by tube F' with chambers (*

page_text: and C, and by orifices F3 and F2 with chambers and C, the said cock or tap being
so cemented to the filter and filtering mass as to form chambers C and C+ all parts
operating in combination with each other, substantially as and for the purposes set
forth.
Sixth. A filter constructed substantially as hereinbefore described and shown.
ated this 18th day of July 1890.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicants.