Sewer and Drain Air Inlet.
Year: 1895

page_text: Date of Application, 12th Nov., 1895
Complete Specification Left, 12th Aug., 1896-Accepted, 12th Sept., 1898
PROVISIONAL SPECIFICATION.
Sewer and Drain Air Inlet.
I PERCY MUNRO BEAUMONT of Maldon in the County of Essex, Civil
Engineer and Architect do hereby declare the nature of this invention to be as
follows:-
A vertical pipe is taken from sewer, drain or intercepting trap to ground level
and covered by a grating so constructed as to admit air but not to allow dirt &c. to
pass into sewer or drain; into the vertical pipe is inserted a cylinder with mica or
other valves which will allow the air to pass into the sewer or drain bat will
provent the escape of sower gas through the air inlet; this cylinder is movable
to allow inspection & cleansing of trap or sewer or drain.
November 12th 1895.
Dower a
Drain
1, PERCY MUNRO BEAUMONT, of. Maldon, in the County of Essex, Civil
Engineer and Architect, 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 :—
The object of this invention is to provide sewers, drains or intercepting traps
therein, with means which will allow fresh air to pass into the sewer, drain or trap
but will prevent the escape of the sewer gases through the air-inlet pipe.
In the accompanying drawings
Fig. 1 shews a section of a drain, and intercepting trap fitted with my improved
means for supplying fresh air thereto.
Fig. 2 is a sectional side elevation of the air-inlet device alone, drawn to a larger
scale; and Figs. 3 and 4 are respectively front elevation and plan of same.
The same letters of reference where they occur are used to indicate the same or
corresponding parts in all the figures.
To the sewer or drain, or to the intercepting trap, is secured a vertical pipe A,
the lower end of which is in open communication with the sewer, drain or trap as
shewn in Fig. 1 while the upper end terminates at or near the ground level and is
covered by a foot plate B having an annular grating b. The upper section of the
ventilating pipe A is furnished with an outer basin or annular gutter a which forms
a trap for the interception of water, stones, dirt or other foreign matter passing
through the grating b.
Into the ventilating pipe A is inserted an air-inlet device having one or more
traps to catch water, stones &c. and one or more non-return valves which open by
the downward pressure of the incoming air, but close against the upward pressure
of sewer gas &c. from within.
+
A device of this kind such as I prefer to use is shewn in Fig. 1 and in enlarged
views in Figs. 2, 3 and 4 of the accompanying drawings. I prefer this form of

page_text: air-inlet as it is well adapted to be fitted to the ordinary ventilating pipe of
circular section such as is shewn in Fig. 1. This air-inlet device is made with a
cylindrical body C having a downwardly projecting flange or lip C', an aperture ³
and two central or approximately central webs or baffle plates e and e' the latter
enclosing a recess which forms a trap for water, stones &c. The lower end of
the body terminates in a semi-cylindrical leg D closed at the bottom and having
two hinged tale, mica or other suitable valves E in the flat front wall d thereof.
This air-inlet device is supported in the ventilating pipe A by the lip or flange C¹
catching on the upper edge of the pipe and dipping into the annular gutter a.
When the latter is filled to a sufficient height with water or other liquid the
air-inlet device is trapped in the gutter a.
Air passing through the grating b (wator, stones, dust, and other foreign matter
drops into the gutter a,) enters the aperture c³ and passes through the device in
the direction shewn by the arrows in Fig. 2. Should the pressure of the gases
inside the pipe A be greater than that on the other side of the valves E.these will
be closed and the exit of gases from the air inlet pipe thus prevented.
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 ;-
For supplying fresh air to sewers and drains, an air-inlet pipo leading from the
sewer or drain to the ground level, a grating fixed in the ground above said air-
inlet pipe for ingress of fresh air, and an air-inlet device fitted in said pipe and
having traps or recesses to catch and intercept the passage of water, stones and
other foreign matter and one or more valves which allow air to pass down to, but
prevent the gases from escaping through the air-inlet pipe substantially as herein-
before described.
D
...
1
1.
F. W. GOLBY,
36 Chancery Lane, London, W.C., Patent Agent for the Applicant..
MASSA