Year: 1898

page_text: WILLIAM WARNER, Hope Drive, The Park, Nottingham, Civil Engineer, do
hereby declare the nature of this invention to be as follows:-
When sewer gases are under control in the sewers or drains, there is less chance
of nuisance arising therefrom.
Sewers & drains have been constructed with that object by dividing them into
sections by means of flaps & syphons to prevent the gases passing from one section
to another.
My invention consists of a combined syphon & flap for fixing in sewers and
drains, having the body with inlet and outlet of the same capacity as the sewer
or drain in which it is fixed.
About the centre the flap is placed with hinges at the top, and seatings down
the sides.
The bottom of the flap is a little lower than the invert of the sewer, and
immediately under the flap of the body of syphon is hollowed out, so that the
normal flow of sewage may pass without obstruction.
The hollowed out part forming a dip in the sewer under the flap retains a
portion of sewage, thus forming an effectual sewer gases trap; and as the flap
is hinged it is free to move when the flow of sewage is increased. Thus sewers &
drains can be trapped in sections with no obstruction to the flow of sewage.
For convenience the apparatus may be placed in a manhole or inspection
chamber, in which case the top part of the body beyond the flap is made to form
an open channel.
Dated this 24th October 1898
WILLIAM WARNER, Hope Drive, The Park, Nottingham, Civil Engineer, 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:.
When sewer gases are under control in sewers or drains there is less chance
of nuisance arising therefrom.
Sewers and drains have been constructed with that object by dividing them into
sections by. means of flaps and syphons to prevent the gases passing from one
section to another.

page_text: My invention consists of a combined syphon and flap for fixing in sewers and
drains, having the body with inlet and outlet of the same capacity as the sewer
or drain in which it is fixed.
In order that my invention may be fully understood I have illustrated in the
accompanying drawings a combined syphon and flap, constructed according to
my present invention."
Figure 1 represents a section of the sewer flap syphon trap upon the line a, b, in
Figures 2 and 3.
Figure 2 represents a section of the sewer flap syphon trap upon line c, d, in
Figure 3.
Figure 3 represents a half plan of the sewer flap syphon trap and half section
upon line e, f, in Figures 1 and 2.
In all the figures similar letters indicate similar parts.
The body part of the sewer flap syphon trap is shewn by the letters h, g, m,
and j.
The part his formed a socket to receive the sewer or drain pipe spigot although
I prefer to make it as shewn it is obvious this part does not affect the invention,
and it may be made with flange or any shape convenient for connecting the sewer
or drain.
The party is circular with the bottom hollowed towards the centre m to form
syphon.
The part is
shaped open at the top and hollowed at the bottom towards m
to complete the syphon.
The top may however be made circular or square and and enclosed, in which
case a door is placed near the hinge o to take out the flap, but I prefer to con-
struct the sewer flap syphon as shewn, so that it may be fixed in a manhole and
thus readily examined and cleaned.
The flap is resting upon the seating 7, when the sewage is passing at normal
flow, thus forming a syphon to keep sewer gases back in the section beyond.
The seating and flap is finished air tight and in some cases rubber or other
suitable material is placed upon the seat or cover to ensure a good fit.
The hinge o is fitted with a moveable bearing made in gunmetal or lead to
allow the flap to rise at times when the flow of sewage is above normal, caused by
flood or flushing.
When the sewage is very offensive and produces a large volume of sewer gas,
the flap may be made air tight after rising by attachment of rubber to the sides.
The flap may be made to rise more easily by means of balance weights, or by
making the flap hollow so that it may float" with the rise of sewage.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim is:
-
1. Sewer flap syphon trap substantially in the manner described and illustrated
in the accompanying drawings.
T
1