An Improved Valve or Flap for Sewer Gas Interceptors.
Year: 1895

page_text: Date of Application, 29th Oct., 1895
Complete Specification Left, 29th May, 1896-Accepted, 4th July, 1896
PROVISIONAL SPECIFICATION.
An Improved Valve or Flap for Sewer Gas Interceptors.
I, JOHN MITCHELL, of the Firm of J. Mitchell & Co., Sanitary Engineers,
95 & 96 Drury Lane, London, W.C., do hereby declare the nature of this invention
to be as follows:-
My invention consists of a cylindrical or tapered ring of iron, brass, or other hard
material, to which is attached, by means of a pivot, hinge, knuckle, or any other
suitable arrangement, a flap of similar material to the ring, but constructed in the
form of a taper plug on the inner side & having a heavy rim or flange on the outer
side. At a suitable position round the plug a groove is made, into which I force
rubber or some other yielding or flexible material, but so as to leave a sufficient
projection beyond the periphery of the plug to increase it to a greater diameter
than that of the inside of the cylindrical or tapered ring into which it will be
forced.
In making the aforementioned ring, I prefer to provide it on the outside with
webs, lugs, feathers, or other suitable device, so as the more readily to cement same
into the socket of the clearing arm of any ordinary sewer gas interceptor; but I also
claim to construct it with an additional socket to fit over the socket of the clearing
arm, in which case I should fix it by means of cement, clips, or any other suitable
method.
The flange & plug which I have already described is fitted externally with a
hook, loop, or hole, so that it can be raised by means of a chain, crook, or rod
(attached or otherwise) by the person desiring to inspect or cleanse the clearing
arm, without necessitating the descent of such person into the inspection chamber.
I claim for my improved valve or flap, that when it is in use, it will by its own
weight, or by a slight additional push, form a perfect seal against sewer gas, whilst
it can at any time be readily & simply opened & closed, without the necessity of
breaking away or making good, any cement or other jointing material; & will
thus not only save labour & material, but will render the interceptor more
cleanly, effective & of neater appearance than it would be without such
attachment.
Dated this 29th day of October 1895.
ive of flap for sewer Gas Interceptors.
I, JOHN MITCHELL, of the Firm of J. Mitchell & Co., Sanitary Engineers,
95 & 96 Drury Lane, London, W.C., do hereby declare the nature of this inven-
tion and in what manner the same is to be performed, to be particularly described
and ascertained in and by the following statement :-
My invention consists of a cylindrical or tapered ring of iron, brass or other
hard material, to which is attached by means of a pivot, hinge, knuckle, or any
other suitable arrangement, a flap of similar material to the ring, but constructed
in the form of a tapered plug, with a heavy rim or flange. At a suitable position,
[Price 8d.]

page_text: round the plug, a groove is formed into which I force rubber or other suitable
yielding or flexible material, in such a manner that when the plug is dropped or
pushed into the ring, a gas-tight joint is made by the rubber impinging upon the
inner surface of the said ring.
"
"
In order that my invention may be more fully understood I have prepared and
attached hereto a drawing shewing a side elevation (Fig. 1) and section (Fig. 2) of
my valve. It will be seen by reference to the drawing, that the ring A is shewn
provided with "webs or* "feathers in order that it may be more securely
cemented into the socket of the clearing arm of any ordinary sewer gas interceptor,
but I may vary the form of this ring by enlarging it at its base and so forming a
socket which could be placed over the socket of the clearing arm and be fixed
'thereto by means of cement, clips, or any other suitable method. The flanged plug
or flap B is fitted externally with a hook, loop, or hole, so that by means of a chain,
crook, or rod, attached or otherwise, the valve can be opened and closed by any
person desiring to inspect or cleanse the interceptor, without such person being
compelled to descend into the inspection chamber.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is
1. The construction of an automatically closing, gastight valve, by means of a
ring A, and heavy flap B, with a flexible ring or sheath C, made and combined
substantially as and for the purposes herein described and shewn on the accom-
panying drawing.
2. The application of same to my own, or any ordinary sewer gas interceptor;
substantially in the manner herein described.
Dated this 28th day of May 1896.
JOHN MITCHELL.