Ax IMPROVED STENCH TRAP
Year: 1875

page_text: LETTERS PATENT to Matthew Wilson, of Loughboro' Road, Brixton,
in the County of Surrey, Gentleman, for the Invention of " Ax
IMPROVED STENCH TRAP."
Sealed the 11th January 1876, and dated the 15th July 1875.
PROVISIONAL SPECIFICATION left by the said Matthew Wilson at
the Office of the Commissioners of Patents, with his Petition, on
the 15th July 1875.
I, MATTHEW WILSON, of Loughboro' Road, Brixton, in the County
3 of Surrey, Gentleman, do hereby declare the nature of the said In-
vention for "AN IMPROVED STENCH TRAP," to be as follows:-
My said Invention relates to an improved stench trap, which I call a
"double seal stench trap," and which is constructed as follows:-The
outer case is formed of cast iron, lead, or other suitable material. The
said case has a perforated cover or grating, which is removable for
the purpose of cleaning the trap. The bottom of the said case has

page_text: provision for the usual connection with a drain pipe. Inside the cover
near the top of the case I form a ledge or shoulder for supporting a tray
of cast iron or other metal. This tray has a perforated bottom, and above
it a shoulder, which serves as a seat for a ball formed of hollow metal
or other material having sufficient buoyancy to cause the ball to float
when the tray is filled with liquid Upon the under side of the said
tray I cast or otherwise form or fix a bell or inverted cup, which projects
down into the bottom of the case or box, which is made of the usual
shape to contain liquid, to form the water seal of the trap. The tray
with the bell may be readily lifted from the shoulder whercon it is
supported, and removed from the trap to allow the body of the same to
be cleansed when necessary.
any
It will be seen that the peculiar feature of this Invention is the
combination of the water scal with the ball valve seal, that is to say,
the said trap, as its name applics, has a double scal, so that if foul
gas ascending the drain pipe should pass the lower or water seal of the
trap it will be stopped by the said ball. The latter is preferably secured
by a chain to the tray, so that it cannot be accidentally removed from
the trap and lost. The said ball when down on its scat cuts off the com-
munication between the interior of the tray and the body of the trap,
and the ball will remain in this position so long as no liquid flows
through the top grating or cover into the tray; but when the latter is
filled or partially filled with liquid the ball rises, and allows the said
Liquid to pass through the perforations or holes in the bottom of the
tray, and thence under the bell to the drain pipe.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Matthew Wilson in the Great Seal Patent Office
on the 15th January 1876.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, MATTHEW
WILSON, of Loughboro' Road, Brixton, in the County of Surrey,
Gentleman, send greeting.

page_text: our Lord One thousand eight hundred and seventy-five, in the thirty-
ninth year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto me, the said Matthew Wilson, Her special licence
that I, the said Matthew Wilson, my executors, administrators, and
assigns, or such others as I, the said Matthew Wilson, my executors,
administrators, and assigns, should at any time agroc with, and
no others, from time to time and at all times thereafter during the
torm therein expressed, should and lawfully might make, use, exercise,
and vend, within the United Kingdom of Great Britain and Ireland,
the Channel Islands, and Isle of Man, an Invention for "AN IMPROVED
STENCH TRAP," upon the condition (amongst others) that I, the said
Matthew Wilson, my executors or administrators, by an instrument in
writing under my, or their, or one of their hands and scals, should
particularly describe and ascertain the nature of the said Invention,
and in what manner the same was to be performed, and cause the same
to be filed in the Great Seal Patent Office within six calendar months
next and immediately after the date of the said Letters Patent.
NOW KNOW YE, that I, the said Matthew Wilson, do hereby declare
the nature of my said Invention, and in what manner the same is to be
performed, to be particularly described and ascertamed in and by the
following statement, reference being had to the accompanying Drawing
forming a part of this Specification.-
My said Invention relates to an improved stench trap, which I call a
"double seal stench trap," and which will be found very efficient for
preventing the entrance of noxious gases from sewers or drains into
dwelling houses and other places, and which is simple and inexpensive,
and not liable to derangement or the displacement or loss of any of the
parts through the carelessness of servants or otherwise.
The said Invention is carried into practice as shewn in the accom.
panying Drawing, which is a vertical section of my improved stench
trap.
.
The outer case a is formed of cast iron, lead, or other suitable
material. The said case has a perforated cover or grating b, which is
readily removable for the purpose of cleaning the trap. The bottom of
the said case has a provision at c for the usual connection with a drain
pipe. Inside the cover b, near the top of the case a, I form a ledge or

page_text: shoulder a¹ for supporting a tray d of cast iron or other suitable metal
shaped as shewn, or approximately so shaped. This tray d has its
lower portion d¹ perforated at the bottom, as shown at d², and it is either
perforated with round holes or has slots or long apertures at d³. The
part immediately above this perforated or slotted portion of the tray
serves as a seat for a ball e formed of hollow metal or other material,
which has sufficient buoyancy to cause the said ball to float when the
tray is filled with liquid: Upon the under side of the said tray I cast or
otherwise form or fix a bell or inverted cup f, which projects down into
the bottom or lower portion of the casc or box a. The said case or box
is made of the usual shape to contain liquid to form the 'water seal of
the trap. The tray with the bell may be readily lifted from the shoulder
whereon it is supported, and removed from-the-trap-to-allow-the-body-of-
the same to be cleaned when necessary.
It will be seen that the peculiar feature of this Invention is the
combination of a water scal with a ball valve seal, that is to say, the
said trap, as its-name implies, has a double scal, so that-if any foul gas
ascending the drain pipe should pass the lower or water scal of the trap
it will be stopped by the said ball. The latter is preferably secured by
a chain to the tray, so that it cannot be accidentally removed from the
trap and lost. The said ball when down on its soat cuts off the com-
munication between the interior of the tray d and the body of the
trap a, and the ball e will remain in this position so long as no liquid
flows through the top grating or cover b into the tray d; but when the
latter is filled or partially filled with liquid the ball e rises, and allows :
the said liquid to pass through the perforations or holes in the lower
portion of the tray, and thence under the bell fand through the
passage c to the drain pipe.
Having thus fully described the said Invention, and shown how the
same may be conveniently and advantageously carried into practice, I
wish it understood that I claim,-
First. In a stench trap the combination of a ball valve and bell or
inverted cup, acting in such a manner that the said trap is doubly sealed
or closed against the passage of foul or noxious gases.
Second. A stench trap with the outer case or box and perforated
cover, the tray with its perforated or slotted lower portion, and the ball

page_text: valve resting in the same, and with the bell or inverted cup over the
drain pipe aperture, constructed and combined as herein set forth, and
for the purposes specified. .
In witness whercof, I, the said Matthew Wilson, have hereunto set
my hand and seal, this Fifteenth day of January, in the year of
our Lord One thousand eight hundred and seventy-six.
Witness,
ROWLAND GEO BROWN,
8, Southampton Buildings,
London.
MATTHEW WILSON (L.S.)