MENTS IN VENTILATING SIPHON TRAPS FOR DRAIN, SOIL, OR WASTE PIPES
Year: 1884

page_text: COMPLETE SPECIFICATION
I, JAMES MILLER, of 4 Seymour Street, Glasgow, in the County of Lanark, North
Britain, Builder, do hereby declare the nature of my said invention for "IMPROVE-
MENTS IN VENTILATING SIPHON TRAPS FOR DRAIN, SOIL, OR WASTE PIPES" and in
what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement:-
My said Invention has for its object to construct an improved siphon trap for
drain, soil, or waste pipes, such trap being specially formed for the adaptation to it
of connections for cleansing purposes, for the egre-s of noxious gas-s, and for the
admission of fresh air, in a manner to be more efficient and satisfactory than traps
heretofore in use for similar purposes.
The practical advantages of my improved traps arise from the shape and
arrangement of its parts which will be most readily understood from the explanatory
drawing which is hereunto appended and is hereinafter referred to in particularly
describing my improvements.
Figure. 1, on the accompanying sheet of drawings is a vertical section showing
my improved trap in position a little below the ground level and with some of its
connections; and figure, 2, is a plan of the trap by itself.
My improved trap is made with its bottom of a continuous smoothly curved form
from its inlet faucet, 3, to its outlet or discharge end, 4, avoiding square or abrupt
changes of direction, which although sometimes advocated are in my opinion
injurious in two ways-by diminishing the momentum of flow, and, by agitating
the liquid and thereby promoting the disengagement of noxious gas. I arrange the
well, 5, for cleansing on the outlet side of the dipping or trapping partition, 6; and
on the same side I form a small branch faucet, 7, for connecting to the trap a pipe
to lead away gas from the sewer or drain and to prevent pressure of gas from
acting on the surface of the water on the outlet side of the dipping partition, 6. A
short length of pipe, 8, forms a continuation of the cleansing well, 5, up to un
opening at the surface, this opening being fitted with a hinged door, 9. On the
inlet side of the dipping partition, 6, I form on the trap a branch faucet, 10, and
connect thereto a short length of pipe, 11, to communicate with an opening which
is fitted with a perforated plate or grating, 12. This grating, 12, and the

page_text: passage, 11, 10, is provided for the admission of fresh air, and the faucet branch, 10,
is curved at its junction with the main trap body so as to guide the entering air
towards the inlet faucet, 3, and the pipes to be connected thereto. Assuming that
the trap is connected to the outer end of a drain or soil pipe from a house it is
intended that the inner end of such pipe shall be connected to a rain water pipe or
other suitable pipe extending up to the roof of the house; and if various branch
pipes lead into the main drain or soil pipe each of these should at its extremity or
highest point be fitted with an air pipe lending into a main air pipe extending to
the roof or should itself be provided with an external outlet at a sufficient height.
With such arrangements there will be always a strong draught in the system of
pipes which will cause a continuous influx of fresh air by the passage, 11, 10; and
the current of air passing through the pipes will carry off any noxious gas which
may be disengaged from liquid whilst passing along the drain or soil pipes.
I have shown my improved trap as formed with lateral inlet faucet branches, 13,14,.
for the attachment of pipes for sub-surface drainage or of waste pipes from washing
basins, baths, or the like; but these may be closed or the trap may be made without
them when they are not required.
Having thus particularly described the nature of my said Invention and in
what manner the same is to be performed I proceed to ascertain the distinctive
feature of novelty thereof by declaring that what I claim is :-
Making ventilating siphon traps for drain, soil, or waste pipes of the improved
form shown in the accompanying drawing and hereinbefore described.
EDMUND HUNT,
Applicant's Agent.