Improvements in Sewer Traps.
Year: 1890

page_text: Date of Application, 13th May, 1890-Accepted, 5th July, 1890
Improvements in Sewer Traps.
I, ALBERT CLAUDE BOWERMAN, of Bloomfield, in the county of Prince Edward,
in the Province of Ontario, in the Dominion of Canada, Physician, do hereby declare
the nature of my invention for "IMPROVEMENTS IN SEWER TRAPS," and in what
manner the same is to be performed, to be particularly described and ascertained in and
by the following statement :-
My invention which will be hereinafter fully set forth and claimed, relates to devices
for preventing the escape of sewer gases through waste pipes.
The object of my invention is a trap which can be emptied at will to prevent its
contents freezing and that can be cleaned while the gas seal is being maintained.
Fig. 1 is a front elevation of my improved trap.
Fig. 2 is a rear elevation of the same.
Fig. 3 is a section of the same on line x x fig. 5.
Fig. 4 is a similar section showing the plug in a different position.
Fig. 5 is a transverse section of the same on line y y figs. 1, 2 and 3.
A is a short cylinder with conical or tapering bore, closed at the small end and open
at the large end, and provided at its circumference with an inlet nozzle A¹ near the
top and at one side, and with an outlet nozzle A¹¹ at the bottom. The outlet opening
is extended circumferentially on the side opposite the inlet by a covered slot-like
opening a B is a tapering plug fitted in the cylinder A and adapted to turn therein
snugly, being provided with a flange b to bear against the rim of the cylinder A and
being held in it by a set-screw 6₁ at the back. Said plug is provided with two
internal passages 61 and 64 65, the upper, 61 6111, being an obliquely transverse
one, the mouth 6 of which is in the circumference or edge opposite the inlet A¹ when
the plug is in its normal position (figs. 1, 2, 3 and 5), and terminates in an outlet 6'11
on the face; the other 6 6 passes from an orifice 6 in the face of the plug to
an outlet 6 in the edge opposite the outlet A" in the cylinder. Formed integrally
with said plug or secured to it by suitable means is a loop pipe or communicating
tube C taking its beginning at the outlet on the face of the plug of the passage bii
6111 and forming a continuation thereof, and terminating on the orifice 64 in the
face of the plug of the passage 64 % of which it also forms a continuation. The
loop C consists of two parallel tubular logs, forming the flow and return sides or leg
adjoining the passage 611 6111 where it is turned sidewardly with a bend c in the
direction of the said passage. A screw plug C₁ is provided at the lower end of
said loop, which when removed, allows of the proper cleansing of the saine.
It will be seen that when the loop is in the position shown in fig. 1, water or other
liquids may enter by the inlet A¹, pass through the orifice in the circumference of
the cylinder A into the passage 611 611 of the plug B, out of said plug by the orifice b111
into the loop C, which it will keep filled to the orifice in the plug on the line L
and flow through the passage 6468 in said plug through the outlet A". The gas
seal is thus made by the liquid in the legs of the loop. By turning the loop and
with it the plug B into the position shown in fig. 4, the continuity of the free passage
will be broken between the inlet A and the passages of the plug, and the loop will
empty itself through the passage 611 6 which is in part open to the outlet A", while
part of the passage b b is partly opposite the slot all. Thus when frost is impending
the loop may be turned and emptied to prevent it from freezing without a passage
for sewer gas being provided.
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 1
claim is :-
In a sewer trap, the combination of a short conical cylinder A having inlet A' and

page_text: outlet A¹ a¹¹, a conical plug B fitting said cylinder to turn therein snugly and having
the passages 6 6111 and 64 65 forming in its normal position continuations of the
inlet and outlet respectively, a loop C forming a continuation with said passages in
the plug and provided with a screw cap C₁ and a set-screw b¹ holding said plug
centrally to the cylinder, substantially as set forth.
Dated this 26th day of March A.D. 1890.
ALBERT C. BOWERMAN.
Per A. Harvey, his Attorney.