Improvements in Sewer Gas Traps.
Year: 1890

page_text: Date of Application, 2nd July, 1890-Accepted, 23rd Aug., 1850
Improvements in Sewer Gas Traps.
I, JOSEF SCHWÄRMER, of Düsseldorf, Germany, Manufacturer, 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 apparatus shown in the accompanying drawings possesses the advantage of
sealing the discharge pipes of urinals, sinks or the like; a result not hitherto attained,
as, when out of use for a short time and the water seal has evaporated, a free passage
has been afforded for sewer gas. Stoppage in the pipes, is also avoided by my
apparatus, even in those cases where the strainer in the sinall chamber is removed or
broken, which frequently leads to coarse materials lodging in the pipes. When the
strainer is removed in my improved apparatus the coarse material is not allowed
to pass into the discharge pipe, but is kept back by a second strainer or grating,
arranged in a peculiar manner.
In the drawings, Figs. 1 and 3 are sections of the apparatus as applied to a
urinal or sink, each section showing the special strainer in a different position ;
Fig. 2 is a plan of the apparatus, and Fig. 4 is a sectional plan of the same.
The apparatus is formed of a vessel a provided with a cover either at the top
or side to remove the sediment and to clean the strainer. A tube c conveys the
water into the vessel or chamber a, the orifice being contracted and dipping down
into the chamber as shown. Above the orifice of the tube c, and above the
discharge outlet d (placed in the annular space around c) is fixed the ordinary
strainer b, so that the waste water is discharged through it before it can enter the
discharge pipe d. By this means the waste water enters the vessel a, fills it to
the level of the outlet in the pipe d, from which it is carried off to the sewer.
As the water rises in the chamber a it lifts a floating sieve e from the position
shown in Fig. 1 to that shown in Fig. 3 where it makes close contact with the
inverted seat h. The sieve e, by means of a central hole passes over the mouth
of the pipe c so that all sediment or floating matter is kept from passing through
the floating strainer e as the discharge water flows on to the outlet pipe.d. As the
chamber a holds a considerable amount of water, the water seal of the pipe c can only
be broken by evaporation after a lengthened period of time.
The floating sieve or strainer e is not fastened in any way, but it may have
guides or guide ways. The strainer may be combined with cork, or made buoyant
in other ways, so that it is pressed upwards against the seat h by the water in the
chamber. The chamber a and strainer e are easily cleansed by unscrewing the
cover from its seating 9 and allowing the water to flow out, when the strainer e
falls to the position shown in Fig. 1. As the operation of cleansing is simple, and
no skill required to replace the strainer in position, (as in some other forms of
apparatus) there is no tendency to omit the operation, while the strainer itself is
always ready for use and cannot easily be tampered with.
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:
A sewer gas trap apparatus for discharge pipes consisting of a buoyant strainer e
1
1
hodanted to rise be its bravanov to a

page_text: position above the orifice of the inlet pipe c and to be seated below the discharge
pipe outlet d, and to fall into a position in front of the opening 9 when the cap f
is removed; substantially as and for the purpose described.
Dated this 1st dose of Taal 1900
FAIRFAX & WETTER,
433, Strand, London, Agents.