Improvements relating to the Ventilation of House Drains.
Year: 1892

page_text: COMPLETE SPECIFICATION.
Improvements relating to the Ventilation of House Drains.
I, CARL BEHN of Hohestrasse 7, Hamburg in the Empire of Germany, Engineer
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 the drainage of houses and consists in a system by which
not only is the outlet to the main sewer or to the cess-pit closed by a water seal so
that foul gases cannot pass to the house drain from the sewer or cess-pit, but a
special arrangement is made to produce a suction up current in the house drain and
soil pipes so that any gases occurring therein are carried off outside the house above
the roof instead of being suffered to pass out unassisted with such tendency as
their warmth or other properties may give them to rise through the ventilating
pipes.
In the drawings
Fig. 1 is a sectional elevation of a house showing the soil drainage-according
to the present improved system.
Figs. 2 to 6 are enlarged detail views of the apparatus employed.
The invention consists mainly in providing in the soil drain a or also if desired
in the waste water drain if distinct from the soil drain a water trap R shown in an
enlarged scale in section in Fig. 2 and in plan in Figure 3 and so contrived that
the space E in communication with the house drain leads upward to be connected
with pipe m leading to the surface of the ground or thereabouts and serving as an
inlet for fresh air. The trap R may be made as ordinary traps or of cast iron
enamelled on the inside. It is provided at the junction with the air inlet pipe m
with a valve / to permit only of entrance of air into the trap and not of outlet of
gas therefrom into pipe m. The valve may be made of mica in the form of a plate
pivoted or hinged to seat against a hard rubber seating fixed in the branch of the
trap which forms the socket for pipe m. When after the use of a closet and
delivery of contents into the drain a back pressure due to partial vacuum in
the soil pipe prevails, the valve h opens and fresh air enters the soil pipe through
pipe m.
To provide however for the constant ventilation of the soil pipe p a suction
ventilator U is placed on the upwardly extended end of the pipe p so as to cause
a continual or substantially continual suction of air from the pipe p, which is attained
with little difficulty owing to the provision of the air inlet at m.
The construction preferred for the ventilator U is a rotary T tube, the horizontal
limb of which is provided at one end with a conical inlet nozzle B ending in a
reduced orifice d supported a little past the central vertical cross plane of the
pipe p.
The vertical limb b surrounds the end of the pipe p and the rotary bearing
of the T tube is provided for in the usual manner by a spindle and step and collar
bearings. The wind entering the cone B draws out the air from the pipe pas
indicated by the arrows and consequently exerts a suction which causes fresh air
to enter the pipe p at m and circulate through the drain a and soil pipe p.
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;-
In house drainage, the combination of a water-seal trap R inserted at the
termination of the house drain and having a chamber E in direct communication
with the house drain, the pipe m leading into the atmosphere from said chamber E,
the valve has set forth in said chamber, and a ventilator on the extension of the
TD 071

page_text: soil pipe p or other pipe leading to said drain a, the said ventilator constructed to
operate a suction on the contents of pipe p, the whole substantially as and for the
purpose set forth..
Dated this 3rd day of May 1892.
HERBERT & Co.,
18, Buckingham Street, Strand, London, W.C., Agents to Applicant.