Improved Combined Sewer Gas Excluder, Trap, and Sink.
Year: 1889

page_text: Date of Application, 26th Apr., 1899-Accepted, 13th July, 1889
COMPLETE SPECIFICATION.
Improved Combined Sewer Gas Excluder, Trap, and Sink.
A communication from abroad by WILLIAM WALLACE, of 56, Clay Street, in the City
and County of San Francisco and State of California, United States of America,
Sail Maker.
I, WILLIAM PHILLIPS THOMPSON F.C.S. M.I.M.E. of the Agency for Foreign
Patent Solicitors 6, Lord Street Liverpool & 6, Bank Street Manchester both in the
County of Lancaster & 323 High Holborn in the County of Middlesex, Civil 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 improvements in combined sewer gas excluder, trap, and
sink, of which the following is a specification, reference being had to the accompanying
drawing, and the letters referring thereto.
Figure 1 is a sectional view, showing the sewer gas excluder, a portion of the
sink broken out, and the waste pipe.
Figure 2 is a perspective view of the same.
A represents the outside shell, or supporting frame, B the sink bottom, CC the
case attaching lugs, D the set screw, E the screw sleeve, F the stem or piston rod,
G the packing, and G² the trap cup, H the attaching screw plate for the packing,
I the attaching screw for the packing, J the groove which forms the water trap in
the sink, K represents the waste pipe, L' represents the strainer.
The following is the construction of the improved sewer gas excluder, trap
and sink.
The whole is generally formed of such material as is generally employed in the
construction of that class of manufacture.
The sink bottom B is formed, when the same is of material, with an annular
trap groove J, but when the sink bottom is of wood, the annular trap groove J is
formed in a metal plate to be inserted in the bottom of the sink.
The trap cup or piston G¹ is formed with its lower rim to operate about in the
centre of the annular trap groove J, which is varied in depth to suit the requirements
of the sink.
A strainer L¹ is employed, when required, as in other sinks, to prevent larger
pieces from passing into the waste pipe.
The openings L'at the base of the outer case or supporting frame A, are designed
to allow the flow of water to the waste pipe, and keep back coarse particles from
passing through into the waste pipe. The packing G is formed of rubber or other
suitable material now in use for such purposes; a thread is formed in the outer case A
to correspond with the thread upon the stem sleeve E. The stem F is fitted in the
stem sleeve E so as allow the stem sleeve E to turn freely and operate by its screw or
thread to raise and lower the trap cup for opening and closing the waste pipe.
One of the important advantages of the improved combined sewer gas excluder,
trap, and sink, is seen in the fact that the necessity of a trap below in the pipe is
obviated, and the waste pipe is emptied of water, leaving none to freeze or become
stagnant in the pipe, no water being required to seal the waste pipe except that in the
trap groove J, which may always be kept clean and pure.
The outer case or supporting frame A may be attached by ordinary lugs C C and
screws, but for convenience in running, catch nibs and set screws may be employed.
The waste pipe K is generally screwed in, as shown, but it may be attached by any
well known mode.
The following is the operation of the improved combined sewer gas excluder, trap,
and sink.

page_text: When it is required to discharge the water from the sink, the sleeve screw E is
operated to open the waste pipe K by raising the rubber valve or packing G. The
water flows in through the straining holes L and down into the trap groove J, and
over into the waste pipe K, through which it is discharged.
The suction is so great in the pipe K, when the water is running freely down,
that the trap groove J is kept clean of all sediment, and the said groove
Jis kept
full by the last of the water that draws in from the bottom of the sink, thus always
keeping the waste pipe sealed against sewer gas from below, even when the cup G'is
raised, and the water is running through the waste pipe, the lower rim of the trap
cup G is always below the surface of the water in the groove J. When the
water is all discharged from the sink, the trap cup G¹ is screwed down, tightly
closing the packing down, and perfectly sealing the waste pipe, and preventing the
escape of sewer gas in the room.
Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed, as communicated to me by
my foreign correspondent, I declare that what I claim is :-
1. In combination with a sink bottom, having the trap groove
concentric with
a waste pipe K, the trap cup G1 with packing G, constructed substantially and
operated as set forth.
2. In combination with a sink bottom having the trap groove J, concentric with a
discharge pipe K, the cup G¹, to operate in the said groove J, substantially as and for
the purposes set forth.
3. The combination of an inverted cup containing a rubber valve or packing with a
top of a discharge or waste pipe, in a sink by means of the outer case A, having
the openings L, the attaching lugs CC, the trap cup G having the stem F, the
screw sleeve E, and the rubber packing G, constructed, arranged, and operated
substantially as and for the purposes set forth.
Dated this 24th day of Anril 1889
WM. P. THOMPSON & Co.,
Agents for the Applicant.