Improvements in or relating to Inspection Chambers for Drains.
Year: 1896

page_text: Date of Application, 25th Feb., 1896
Complete Specification Left 25th Nov. 1896 Accented 9th Jan
1897
PROVISIONAL SPECIFICATION.
Improvements in or relating to Inspection Chambers for Drains.
I, ROBERT THOMPSON of 2 Mexfield Road, East Putney, in the County of
Middlesex, Builder, do hereby declare the nature of this invention to be as
follows:-
This invention relates to inspection chambers for drains. At present these
inspection chambers are usually built up of brick or stone with the result that
when the chamber is filled with water for the purpose of testing the drains, the
water percolates between the bricks etc., thus spoiling the test, while in other
cases, where the drain becomes blocked and the sewage rises in the inspection
chamber the rough and absorbent brick or stone surface afford a good hold to the
filth, thus fouling the inspection chamber which cannot easily be cleaned.
In carrying out my invention I make the inspection chamber of suitably shaped
lengths of ordinary glazed stoneware, porcelain, glass, enamelled iron or equivalent
piping socketted together in the usual way, suitable hand or foot holds being
provided where requisite as well as branches for air or drainage pipes. The top
of the chamber may be closed by an iron cover in the usual way and as each
length is provided with a socket the cover may be made to fit the socket upon the
top section, thus obviating the necessity of forming a special socket. The bottom
section may be jointed direct on to a floor or bottom, or the floor or bottom may
form a portion of the bottom section. The floor would have the various drain
chanuels formed in it as well as the usual trap or liquid seal, and opening and
cover for inspection and cleaning the drain. The channels in the floor would
form the usual open drains for inspection purposes, and the floor would be provided
with any required number of branches to receive the various drains, and as. the
channels can be moulded in the floor they will always retain their proper respective
positions without danger of wrong levels or inclines or of their becoming separated,
or of leakage occurring at those parts.
The various sections and parts can be made in standard sizes and the height of
the inspection chamber can be arranged by the number of sections employed; the
bottom section of a separate floor can be also stocked in various shapes, sizes and
Dumbers of branches so that the whole parts of an inspection chamber can be
selected, only requiring to be put together by cement and thus greatly reducing
the expense of such a chamber.
Dated this 25th day of February 1896.
BOULT & WADE,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in or relating to Inspection Chambers for Drains.
I, ROBERT THOMPSON, of 2 Mexfield Road, East Putney, in the County of
Middlesex, Builder, 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 inspection chambers for drains. At present these

page_text: inspection chambers are usually built up of brick or stone with the result that
when the chamber is filled with water for the purpose of testing the drains, the
water percolates between the bricks etc., thus spoiling the test, while in other
cases, where the drain becomes blocked and the sewage rises in the inspection
chamber the rough and absorbent brick or stone surfaces afford a good hold to the
filth, thus fouling the inspection chamber which cannot easily be cleaned.
In carrying out my invention I make the inspection chamber of suitably shaped
lengths of ordinary glazed stoneware, porcelain, glass, enamelled iron or equivalent
piping socketted together in the usual way, suitable hand or foot holds being
provided where requisite as well as branches for air or drainage pipes. The top
of the chamber may be closed by an iron cover in the usual way and as each
length is provided with a socket; the cover may be made to fit the socket upon the
top section, thus obviating the necessity of forming a special socket. The floor or
botton forms a portion of the bottom section so that joints below the normal
water-line are avoided. The floor would have the various drain channels formed
in it as well as the usual trap or liquid seal, and opening and cover for inspection
and cleaning the drain. The channels in the floor would form the usual open
drains for inspection purposes, and the floor would be provided with any required
number of branches to receive the various drains, and as the channels can be
moulded in the floor they will always retain their proper respective positions
without danger of wrong levels or inclines or of their becoming separated, or of
leakage occurring at those parts.
In the accompanying drawings, which illustrate by way of example one
construction of inspection-chamber according to this invention.
Fig. 1 is a vertical central section of the same; and
Fig. 2 is a perspective view of the lowest section of the chamber as seen from
above.
Like letters indicate like parts throughout the drawings.
A B and C are the sections of say ordinary glazed stoneware provided
respectively with flanges A' B' C' so disposed upon each of them as to receive
and retain the lower end of the section next above it, which can be jointed or
luted into place therein. The uppermost section A may have, if desired an inner
flange, A, in addition to the outer flange A', so that there will be a groove A³
between them to receive the grease seal into which the flanges of the usual or
other convenient cover are inserted.
The bottom section C, is integral with the floor or bottom C2 of the chamber,
in which are formed various drain channels C³ as well as the trap C for a liquid
seal and an inspection opening C, through which latter the drain can be inspected
and cleaned, the inspection opening being provided with a cover D. At the
points at which the several channels C3 open upon the outside of the bottom
section annular projections C are provided to serve as sockets for receiving the
various branch pipes. By making the trap integral with the floor or bottom
leakage such as is usual with traps jointed into place is prevented.
A convenient mode of providing hand and foot holds in the chamber is to
groove or notch the upper portion of each section as at E, and to drop bars F
into those notches so that they assume the position in which they are shown in
Fig. 2. Each bar thus dropped into place will be maintained in position by the
weight of the sections above it, but can additionally be secured by cement if
desired.
The sides of the chamber are not of necessity vertical. The walls of the upper
section or sections of the chamber can be inclined inward on all sides in the manner
indicated by dotted lines in Figure 1, so that it shall not be necessary to employ
for large inspection-chambers a correspondingly large.cover.
The various sections and parts can be made in standard sizes and the height
of the inspection-chamber can be arranged by the number of sections employed;
the bottom section can be stocked in various shapes, sizes and numbers of branches
so that the whole parts of an inspection-chamber can be selected, only requiring

page_text: to be put together by cement and thus greatly reducing the expense of such a
chamber.
Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
1. In an inspection chamber such as described a bottom section such as C
integral with the floor C' for the purpose described.
2. In an inspection chamber such as described the combination with a bottom or
floor such as C of a trap integral therewith substantially as and for the purpose.
described.
3. In an inspection chamber such as described foot-holds such as F held in place
in the manner described.
4. The combination with the uppermost section of an inspection-chamber such
as described of double flanges integral with the section to receive between them.
the flange of the cover substantially as described.
5. The combination and arrangement of parts constituting the complete
inspection-chamber substantially as described and illustrated in the accompanying
drawings.
Dated this 25th day of November 1896.
K. THOMPSON.
Boult & Wade,
Agents for the Applicant.