Improvements in Drain Traps.
Year: 1887

page_text: Date of Application, 2nd Apr., 1887.
Specification Accepted, 17th May, 1887.
[Communicated from abroad by JOHN MAGUIRE, Drain Inspector, and ROBER
CARROLL, Merchant, both of the City of Toronto, Canada.]
Improvements in Drain Traps.
I ALFRED JULIUS BOULT of 323 High Holborn, in the County of Middlesex, M.I.M.E.
do hereby declare the nature of this invention and in what manner the same is to he
performed, to be particularly described and ascertained in and by the following
statement:-
The object of the invention is first to so form a drain tile trap that any soil or
sediment will be carried out of the trap and prevented from returning; secondly in
locating a hand hole in such a position that both the trap and portion of the tile
leading to the sewer can be readily and simultaneously examined; and it consists
essentially first, in forming the outlet of the trap at a point below the inlet, the seal
a curved flange
protector between the trap and the outlet having
or lip so formed on
it that any back wash will be caught and prevented from reentering the trap; secondly
in locating the hand hole immediately over the seal protector in the outlet portion of
the trap.
Figure 1 is a perspective sectional view of a P or down pipe trap.
Figure 2 is a perspective sectional view of a running trap constructed in accordance
with this invention.
Figure 3 is a perspective sectional view of a hand hole and ventilating trap
constructed in accordance with this invention.
In the drawing like letters of reference indicate corresponding parts in each
figure.
:
A represents the inlet to the pipe B and C is the outlet which leads to the sewer.
It will be noticed that the level of the seal in the trap B is slightly below the bottom
of the inlet A while it is slightly above the top of the outlet C; the top of the seal
protector D being the point which determines the level of the seal.
It will be noticed that a lip or flange a projects from the seal protector D towards
the outlet C and is curved so that the water and material passing through the trap B
will readily flow over it into the outlet C..

page_text: Owing to the fact that the outlet C is below the inlet A and that the seal
protector D is located and formed as shown any liquid or solid matter entering the
trap B must when it once reaches the top of the seal protector D flow over and fall
clear of the seal protector D into the outlet C and the flange a which projects over
the bottom side of the outlet C not only increases the velocity of the flow of the water
and solid matter through the trap B by creating a fall from the said trap but it is
also so shaped that it effectually prevents any back wash through the outlet C into
the trap B.
In Figure 3 a vent hole E is shown immediately over the inlet opening of the
trap B which permits the escape of the obnoxious gases from the trap and a hand
hole F is also shown immediately over the seal protector D which location of the
latter enables both the trap B and the outlet C to be examined and readily cleaned of
any obstruction which might accidentally accumulate therein. It will of course be
understood that the hand hole F is provided with a suitable hermetically sealed
cover.
In all traps with which my correspondents are familiar the bottom of the outlet
pipe leading to the sewer is substantially level with the top of the seal; consequently
solid matter is frequently carried by the back wash back into the trap. Owing to the
formation of, this trap anything which has once passed through the trap cannot re-enter
as the top of the seal in the trap is above the level of the outlet.
Having now particularly described and ascertained the nature of the said invention
as communicated to me by my foreign correspondent and in what manner the same is
to be performed I declare that what I claim is :—
.
1. A trap in which the outlet C is below the level of the seal in the trap B
substantially as and for the purpose specified.
2. A trap in which the inlet pipe is above the level of the outlet pipe in combination
with a seal protector D located between the trap B and outlet C substantially as and
for the purpose specified.
3. A trap in which the inlet pipe is above the level of the outlet pipe in combination
with a seal protector D located between the trap B and outlet C and having a flange a
formed on it substantially as and for the purpose specified.
4. A trap in which the outlet is below the level of the inlet and has a scal protector
located between the outlet and seal proper of the trap in combination with the hand
hole Farranged substantially as and for the purpose specified.
5. A trap in which the outlet is below the level of the inlet in combination with a
vent hole E located substantially as and for the purpose specified.
Dated this 1st day of Anril 1887