An Improved Form of a Disconnecting Ventilating Trap for Drains: and Sewers.
Year: 1896

page_text: Date of Application, 5th Feb., 1896
Complete Specification Left, 2nd Nov., 1896-Accepted, 9th Jan., 1897
PROVISIONAL SPECIFICATION.
An Improved Form of a Disconnecting Ventilating Trap for Drains:
and Sewers.
ANDREW HARKESS Sanitary Engineer 6 Wallis Place Easter Road Leith, N.B..
do hereby declare the nature of this invention to be as follows:-
An improved form of a disconnecting ventilating trap, for drains & sewers to be.
made in stone ware, cast iron, or any other material.
This trap has been designed with a view to make it self cleansing and less liable
to chokage it can be introduced in place of an old syphon trap, or on a drain where-
no trap already exists, without altering the levels of the drains.
The improvement is in the oblique junctions of the side & top inlet eyes to that
part of the trap which forms the water seal of the house side of the trap, the side:
inlet being one inch above the outlet to sewer.
Dated this Fourth day of February 1896.
ANDREW HARKESS.
An Improved Form of a Disconnecting Ventilating Trap for Drains:
and Sewers.
ANDREW HARKESS Sanitary Engineer 6 Wallis Place Easter Road Leith N-B..
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 stateinent :-
A ventilating trap for disconnecting drains, sewers, and other pipes, to be made
of fire-clay or any other material. The outgo portion of the trap is formed in
the usual way, having a raking eye three and a half inches in diameter, as shewn,
at A Figure 2, to permit of any surplus cement being removed from the inside of
the drain at the junction of the trap to the said drain. Or the application of cane-
rods in the case of an obstruction. The novelty of this trap is in the oblique
junctious of the upright and side inlet openings to that part forming the water
seal on the bouse side of the trap as shewn at B and C in Figure 2. The side
inlets, C Figure 2 are not more than one inch above the water seal or the
outlet to the sewer.
And if necessary the inlet and the outlet of this trap can be set level and thus.
obviate the difficulty which is so frequently encountered by sanitary engineers and
others connected with the construction of new drains. As well as the reconstruction.
of existing drainage system, where there is a want of sufficient fall. Or the
difference if level cannot be obtained between the inlet and the outlet necessary to
admit of the insertion of the ordinary disconnecting traps presently in use. Which
generally require a difference of level from three to seven inches. And although
the drains may be tight and in perfect order, the whole system has to be lifted and

page_text: relayed (at considerable expense) to new levels to suit the inlet junction of said
traps. This trap has an efficient water seal and effectually prevents sewer gas
entering the house or building. It is also of the most self-cleansing form, and has
been specially designed for this purpose. The impetus gained by the sewage in
descending the drain being utilized to carry the solid matter past the seal into the
It is therefore not liable to choke, and what is of great importance it can
as already stated, be readily inserted in place of the old and insufficient traps, or
where no trap exists, without altering the levels of the drains, or destroying the
fall to the outlet, or in any way interfering with the drainage system. Except at
that part of the drain where it is desired to introduce a trap. What in the case
of the ordinary trap, would become fixed and cause an obstruction, will pass freely
through this trap to the sewer.
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
do claim is.
That portion of the trap which forms the upright opening and descends obliquly
to the dipping tongue at the water seal, the inlet junction eyes being at about the
same level as the outlet.
Dated this Thirtieth day of October 1896.
ANDREW HARKESS.