Improvements in Gully Traps for Houses and the like.
Year: 1890

page_text: Date of Application, 15th May, 1890
Complete Specification Left, 3rd Dec., 1890-Accepted, 3rd Jan., 1891
PROVISIONAL SPECIFICATION.
Improvements in Gully Traps for Houses and the like.
1, JOHN WHITTAKER WALSH of 13 Penny Street, Blackburn, in the County of
Lancaster, Plumber, etc. do hereby declare the nature of this invention to be as
follows:-
1
This invention has for its object a house drain gully trap apparatus which shall
entirely prevent sewer gas from entering the house, and which, at the same time, can
be very quickly and easily cleaned.
In the apparatus at present generally in use, when there is a heavy pressure of gas
in the drain, it is very apt to force its way through the water seal in the trap and
enter the house.
To prevent this, there are several plans, for instance, the waste water from the
ordinary gully trap inside the house can be made to discharge over a second gully
trap in a chamber or cellar window area outside the house. In this way, the sewer
gas, which may force its way through the first trap, would escape at the grating in
the area into the street or garden, and might find its way through the window
openings. This plan is, however, costly and not always applicable when the building
line abuts on the street or other thoroughfare.
Now my invention is a simple arrangement to effect the same purpose at a much
less cost, by having all the parts in one trap, namely, a gully trap, with dish-stone, a
double dip seal with a ventilator and an inspection hole between them.
The waste and slop water pass through a loose cast iron perforated grating into a
small trap chamber, preferably formed with a rounded bottom without angles, so as to
prevent any deposit occurring, two dips, the one nearest the house being deeper than
the other, dip down into this chamber or bend, and beyond those and at a point
higher than either, the exit to the drain is placed; between the two dips is an
inspection or cleaning hole which is closed by a plate of clay or iron covered with
asphalt or fat, or some other impervions substance placed above the level of the over-
flow to the drain, and below this hand hole, but still in the air space above the water
line, is a branch pipe leading to the open air outside the house, this branch may be
fixed on either or both sides of the chamber.
If then the pressure in the drain is too strong and it passes the first dip, it at once
rises into the intermediate air chamber, and thence through the ventilating pipe and
into the outside air, the greater depth of the second dip preventing its going further
and entering the house.
The mouth of the gully is funnel shaped, so that no dish-stone or slop-stone is
required.
The apparatus is made with its top flat, so that, when the top is set horizontally by
a spirit level, the two water seals are made perfect. This trap may be applied to
surface drains in yards and areas and for other purposes.
Dated this 14th day of May 1890.
WM. P. THOMPSON & Co.,
Of 6, Lord Street, Liverpool, Patent Agents for the Applicant.

page_text: COMPLETE SPECIFICATION.
Improvements in Gully Traps for Houses and the like.
I, JOHN WHITTAKER WALSH of 13 Penny Street, Blackburn, in the County of
Lancaster, Plumber, etc., 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 has for its object a house drain gully trap which shall entirely
prevent sewer gas from entering the house, and which, at the same time, can be very
quickly and easily cleaned, or inspected.
In the apparatus at present generally in use, when there is a heavy pressure of gas
in the drain, it is very apt to force its way through the water seal in the trap and
enter the house.
Attempts have been made to prevent this, by causing the waste water from the
ordinary gully trap inside the house to discharge into a second gully trap in a
chamber or in a cellar window area outside the house. In this way, the sewer gas,
which might force its way through the first trap, would escape into the second trap
and through the grating in the area into the street or garden, and it might thus also
find its way through the window openings into the house. This plan is, however,
costly and not always applicable especially when the building line abuts on the street,
or other thoroughfare.
Now my invention consists in a simple arrangement to effect the same purpose
at a much less cost, by having, all the parts in one trap, namely, a gully trap,
with dish-stone, a double dip seal, and a ventilator and an inspection hole between the
seals.
The invention may be described as follows, reference being had to the accompanying
drawings, in which
Figure 1 is a vertical section of the improved gully trap and
Figure 2 is a plan thereof.
The waste and slop water pass through a loose cast iron or other perforated
grating A into a small trap chamber B, preferably formed with a rounded bottom
without angles, so as to prevent any deposit occurring. Two dips CD, the one C
nearest the house being deeper than the other, dip down into the liquid in this
chamber or bend, as seen in Figure 1. Beyond the dips and at a point higher than
the lower edge of either, the exit E to the drain is placed. Between the two dips
there is an inspection or cleaning hole which is closed by a plate F of clay or iron
covered or jointed with asphalt or fat f, or some other impervious substance. The
cover F is placed above the level of the overflow E to the drain, and below the cover,
but still in the space G above the water line, is a side opening or branch H to which
may be connected a pipe J leading to the open air outside the house. One or both
sides of the chamber may be provided with branches H.
If then the pressure of gas in the drain is so strong that the gas passes the first
dip D, it at once rises into the intermediate chamber G, and thence passes through
the ventilating pipe J into the outside air, the greater depth of the second dip C
preventing its going further and entering the house.
The mouth of the gully may be dished, as shown at a, or made funnel shaped, so
that no separate dish-stone or. slop-stone is required.
The apparatus is made with its top flat, so that, when the top is set horizontally by
a spirit level, the two water seals are made, perfect. This trap may be applied to
surface drains in yards and areas, and may be employed for other kindred purposes.
The gully trap may be made of earthenware, fire-clay, cast, iron or any other suitable
material.
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
1. A gully trap having two dips, one lower than the other, the lower one being the

page_text: further from the drain exit, and having, in the space between the two dips above the
water level, a junction for a ventilating pipe and a cleaning lid, substantially as
described.
2. The gully trap substantially as described and set forth in the drawings.
›d this 2nd day of December 1890.
WM. P. THOMPSON & Co.,
Of Liverpool, Manchester, Nottingham, and London, Patent Agents.