Improvements in Drainage Filtering Tanks.
Year: 1893

page_text: Date of Application, 14th Nov., 1893
Complete Specification Left, 17th Mar., 1894-Accepted, 28th Apr., 1894
PROVISIONAL SPECIFICATION.
Improvements in Drainage Filtering Tanks.
I, THOMAS COSHAM, of Portland House, Bowbridge Road, Newark on Trent,
in the County of Nottingham, Builder and Sanitary Specialist, do hereby declare
the nature of my said invention to be as follows:-
The object of my invention is to construct improved filtering tanks, which will
afford a ready and accessible means of filtering drainage, after it has been treated
with a chemical process, so that the effluent water may be run into a dyke or river,
bright, clear, and free from smell.
My invention consists of a combination of chambers, arranged in a group, all
enclosed in a wall of a cylindrical, polygonal, rectangular, or other suitable
external form; and preferably formed of salt-glazed stoneware, stone, or concrete;
but other suitable materials may be used in its construction.
The sewage to be filtered is carried to one of the chambers, preferably in a
central position, in which the solid matter collects and settles, while the fluids
overflow from thence into the other chambers in succession, one after the other.
The solids are removed by means of fixed socketed pump shafts, into which a pump
may be screwed, and removed from one chamber to another at will. In some or in
all of these chambers one two or more filter box or boxes is or are fitted. These
boxes are supplied with suitable filtering materials, which may be removed, washed
and reinstated for use, as often as required.
My improved tanks are so constructed that very little fall is required from
the inlet to the outlet, and in some cases they may be fitted in existing drains.
They are especially suitable for filtering the drainage from mansions, farms,
farmhouses, or rows of houses, or villages where there are no existing outlets for
sewage.
The work of charging, cleansing, and recharging the tanks may be carried out
by any ordinary unskilled workman.
1000
GEO.
DOWNING,
8, Quality Court, London, W.C., Agent.
COMPLETE SPECIFICATION.
Improvements in Drainage Filtering Tanks.
I, THOMAS COSHAM, of Portland House, Bowbridge Road, Newark on Trent,
in the County of Nottingham, Builder and Sanitary Specialist, do hereby declare
the nature of my said invention and in what manner the same is to be performed,
to be particularly described and ascertained in and by the following statement:-
The object of my invention is to construct improved filtering tanks, which will
afford a ready and accessible means of filtering drainage, after it has been treated
with a chemical process, so that the effluent water may be run into a dyke or river,
bright, clear, and free from smell.
My invention consists of a combination of chambers, arranged in a group, all
enclosed in a wall of a cylindrical, polygonal, rectangular, or other suitable
external form; and preferably formed of cement concrete, salt-glazed stoneware,

page_text: stone, or Staffordshire blue bricks; but other suitable materials may be used in its
construction.
The sewage to be filtered is carried to one of the chambers, preferably in a
central position, in which the solid matter collects and settles, while the fluids
overflow from thence into the other chambers in succession, one after the other.
The solids are removed by means of socketed pump shafts. Chain, or other pumps
may be used for removing the solids.
In some or in all of the chambers, one, two, or more, filter box or boxes is
or are fitted. These boxes are supplied with suitable filtering materials, which
may be removed, washed, and reinstated for use, as often as required.
My improved tanks are so constructed that very little fall is required from the
inlet to the outlet, and in some cases they may be fitted in existing drains. They
are especially suitable for filtering the drainage from mansions, farms, farm-houses,
or rows of houses, or villages or towns, where there are no existing outlets for
sewage.
The work of charging, cleansing, and recharging the tanks may be carried out
by any ordinary unskilled workmen.
And in order that my said invention may be particularly described and
ascertained, reference is hereby made to the accompanying drawings, in which
similar figures of reference indicate corresponding parts.
Fig. is a sectional elevation of a circular group of chambers, constructed
according to my invention, and Fig. 2 is a horizontal section of the same, on the
line 5-6 of Fig. 1.
Fig. 3 is a horizontal section illustrating a rectangular group of chambers more
especially suitable for large towns.
Fig. 4 is a detail, showing the construction of the traps for intercepting the
floating sewage matter, and passing the clearer fluids on to the next chamber.
Referring to Figs. 1 and 2,-7 is a pipe bringing the sewage to be filtered to the
chamber 8. This forms the first settling chamber, the solid portions of the sewage
settling in the chamber 9. The lighter fluids rise in the chamber 10, and overflow,
through the opening 11, into the chamber 12. Here a further settling takes place,
and the fluids pass in a clearer state, through the shielded passage 13, into the
chamber 14. The construction of the passage 13 is shown in elevation in Fig. 1;
in horizontal section in Figs. 2 and 3; and in vertical section in Fig. 4. This
construction of the passages 13 effectually prevents the floating impurities from
passing away previously to their settling, and takes only the clearest fluids from
one chamber to the other. In this manner the fluids pass successively into the
chambers 14, 15, 16, 17, 18, 19, and 20; precipitation taking place in each, and
clear water passing away through the pipe 21, in an innocuous state.
22, 22, are passages fitted with leaden shackle valves, or other traps, leading into
the chamber 9, for enabling the solid portions of the sewage to pass into the
general settling chamber 9. From this chamber the solid matters may be readily
removed by means of a chain pump, (or other pump) fitted to the pipe 23.
Gratings 24 are fitted to ventilate the tanks.
The arrangement of rectangular chambers or tanks, shown in Fig. 3, will be
readily understood from the drawing. The chambers, passages, inlet and outlet
pipes, and chain pump 23, corresponding with those shown in Figs. 1 and 2. The
chambers 12, 12, 14, 15 and 18, communicating with a settling chamber, at the
bottom of 8 and 10, by means of passages 25, fitted with shackle valves or other
traps; and the chambers 16 and 17 communicating with 18 by similar means
at 26.
The chambers 19 and 20, (as well as all or any of the other chambers), may be
constructed as filtering beds to complete the purification of the outflowing liquids.
The form and arrangement of the chambers and tanks may be very much varied,
to suit the circumstances under which the drainage and filtration is required to be
carried out.

page_text: 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 [
claim is:-
1. In drainage filtering tanks, the combination of a group of chambers, com-
municating, arranged and operating substantially as and for the purposes
described.
2. In drainage filtering tanks as aforesaid, the application and use of a number
of settling chambers, in which the fluids are caused to flow from one to another at
a level where they are most free from floating impurities and from solid matter,
and whereby the outflow is rendered innocuous, substantially as herein before
described and illustrated by the drawings.
3. The improvements in drainage filtering tanks, substantially as and for the
purposes described.
ML 1004
GEO.
DOWNING,
8, Quality Court, London, W.C., Agent.