Improved Gully Trap.
Year: 1893

page_text: Date of Application, 17th Jan., 1893
Complete Specification Left, 28th July, 1893-Accepted, 23rd Sept., 1893
PROVISIONAL SPECIFICATION.
Improved Gully Trap.
I ANDREW FORD of 41 Susans Road Eastbourne in the County of Sussex
Architect and Surveyor, do hereby declare the nature of this invention to be as
follows:-
The chief objects of this invention are to enable the inspection and cleansing of
the drain from the body of the trap to prevent unsealing of the trap by syphoning;
and as far as possible from evaporation; by having a deep seal and smallest
surface of water exposed to the air and a longer body also to attain to perfect
cleanliness.
According to this invention I make the outlet round at its extremity to fit the
ordinary drain pipe socket and from this to the main body of trap I form an
inspection arm or pipe and in the front of the trap body I fit a circular plug for
access to same. I make the inspection arm with a flat or nearly flat top both
internally and externally so that water coming from the round pipe of which the
trap is formed, being naturally of a cylindrical form will not fill the angles made
by the flat top, the air therefore left in these corners prevents the trap from
acting as a syphon and consequently unsealing.
I make the seal 3′ instead of about 2" as heretofore so that the trap will not be
liable to be unsealed by evaporation in the event of prolonged dry weather and
disuse, and further in order to prevent this evaporation as far as possible I make
both sides of trap inlet and outlet, vertical, so that the surface of the water forming
the trap, exposed to the air is the smallest, being equal to the area of a circle
whereas in the ordinary trap and also in that known as Stoke's trap the area of the
outlet side of trap is equal to that of an ellipse the water cutting the pipe obliquely.
I also increase the height from the surface of the water to the top or grating to
keep the sun's rays from the water in the trap and also to allow of an easier
sweeping arm. I make the trap of circular pipe so that it is self cleansing, and
the upper part of trap and grating square or oblong as it is easier to finish paving
against or to build dishing to it.
I further provide inlet arms either at the back or sides as required so that the
water shall empty into the trap.
Dated this 17th day of January 1892.
BROWNE & Co.,
9, Warwick Court, W.C., Agents for Applicant.
COMPLETE SPECIFICATION.
Improved Gully Trap.
I, ANDREW FORD of 39B Susans Road Eastbourne in the County of Sussex,
Architect and Surveyor, 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 :-
The chief objects of this invention are to enable the inspection and cleaning of
the drain from the body of trap, and the easy insertion of canes should the trap be
fixed against a wall; to prevent unsealing of the trap by syphoning; and as far
as possible by evaporation, by having a deep seal and smallest surface of water
exposed to the air and a longer body. Also to attain to perfect cleanliness, and to
give an increased force to the water discharging into the trap.

page_text: According to this invention, I make the outlet at its extremity A of the size and
shape of the drain it discharges into, and from this to the main body of trap J, I
form an inspection arm or pipe and in front of the trap body I fit a plug B with an
airtight joint, for access to same. I make the inspection arm or pipe at D with a
flat or nearly flat top, both internally and externally, so that water coming from
the pipes C. E. F. being of a cylindrical form, will not fill the angles made by the
flat top, the air therefore left in these, prevents the trap from acting as a syphon.
The air space and the effect thereof is increased by making the pipes C. E. F. of
less area in section than the outlet. The inspection arm is curved upwards and
the body of trap heightened to allow of easy sweep for cane should the trap be
placed against a wall. To prevent evaporation as far as possible, I make the trap
with a deeper seal, about three inches, and the pipes forming the trap C. E. F
inlet and outlet, circular or without angles in section and C & F exactly vertical,
so that the surface of the water exposed to the air, is the smallest, being equal to
the area of a circle whereas in the ordinary trap the area of water in the outlet C
is equal to that of an ellipse, the pipe sloping and the water cutting it obliquely.
The increased height also of the body of trap J prevents the sun's rays from
penetrating to the water. The parts forming the trap C. E. F. are circular in
section or without angles, so that it is perfectly self cleansing. The body of trap
can be made either square, oblong, circular oval or any other shape at top.
I further provide an improved inlet arm G which can be fitted to trap, either at
the end or sides, its outlet H discharging into trap being contracted so as to create
a greater force to the water discharging therefrom. The trap can be made with or
without inlet and with or without inspection plug.
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
claim is,
1. A trap, made of pipe without angles, whose parts forming the trap inlet and
outlet are vertical and its base internally circular, forming a self cleansing trap.
2. An improved inspection arm, with plug in body of trap, enabling canes &c. to
be inserted when trap is against wall.
3. A deeper seal, and smaller surface of water exposed to the air to prevent
evaporation.
4. A flat or nearly flat top to inspection arm, and parts forming trap smaller than
outlet to prevent syphonage.
5. An improved inlet arm.
Dated this Twenty-seventh day of July 1893.