Improvements in or relating to Syphon Drain Traps.
Year: 1892

page_text: Date of Application, 24th Nov., 1892
Complete Specification Left, 24th Aug., 1893-Accepted, 30th Sept., 1893
PROVISIONAL SPECIFICATION.
Improvements in or relating to Syphon Drain Traps.
I. GEORGE HENRY LIGHT, of 8 Seymour Street, Leicester, Manager of
Colliery & Sanitary Pipe Works, do hereby declare the nature of this invention to
be as follows:→
This invention has reference to syphon drain traps and embodies improvements
having for their object, to admit of the sewage flowing uninterruptedly and in a
compact volume through the trap, while the latter is also formed so as to ensure the
solids being carried forward by the water and thereby practically constitute it a
self-cleansing syphon trap.
In some forms of syphon traps the sewage on entering comes forcibly and directly
into contact with the opposite side thereof, thereby retarding the velocity of the
stream and reducing its capacity to thoroughly cleanse the trap.
According to this invention the dip plate is so constructed or fixed in relation to
the entrance pipe as to obviate this objection and to ensure that the sewage may fall
readily into its proper course in the trap. The lower part of the trap is reduced or
contracted in width and formed of an approximately V shaped section so as to
prevent the solids spreading and to ensure the sewage flowing through the trap in
a more compact volume.
The exit portion of the trap is formed at an easy angle or inclined plane to the
bottom of the trap so as to afford the least possible resistance to the flow of the
sewage and the passage of the solids through the trap.
Dated this 24th day of November 1892.
W. P. THOMPSON & BOULT,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in or relating to Syphon Drain Traps.
I, GEORGE HENRY LIGHT, of Grosvenor House, London Road, (late of
8 Seymour Street) Leicester, Manager of Colliery and Sanitary Pipe Works, 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 :-
This invention has reference to syphon drain traps and embodies improvements
which have for their object to admit of the sewage flowing uninterruptedly and in a
compact volume through the trap, while the latter is also formed so as to insure the
solids being carried forward by the water and thereby practically constitute it a
self-cleansing syphon trap.
The invention will be fully understood from the following further description in
reference to the accompanying drawings wherein
Figure 1 is a longitudinal section of a syphon drain trap constructed in
accordance with this invention.
Figure 2 is a section through what may be termed the dip of the trap and
Figure 3 represents a section taken on either the line A or C and looking towards
the dip.
The dip portion of the trap i.e. from B to C is formed of the section illustrated in
Figure 2, having a narrow channel or contracted lower half, the object of which is
to insure the solids in the sewage being kept together and thus more readily carried
forward through the trap at each flushing.

page_text: For greater facility in connecting the trap to the drain pipes the extremes of the
trap, i.e. from B to A, and from C to D are gradually widened until they assume a
cylindrical form, as shown in the section illustrated in Figure 3.
The gradual narrowing of the channel of the trap from A to B has also an
additional advantage viz. :-The bringing together of the solids in the track of the
descending water and at a time when the latter has the greatest power to force them
through the dip of the trap.
In the drain traps generally employed the sewage upon entering is pitched at a
sharp angle against the opposite side or wall of the trap, thereby retarding the
momentum of the current and decreasing its power to thoroughly cleanse and flush
the dip of the trap.
In Figure 1, the entrance to the syphon is not formed of a sharp angle as in most
traps, but is suitably rounded or curved at A¹ so that the stream of sewage may fall
immediately and uninterruptedly into the dip of the trap, thereby having sufficient
force to clear it at each flushing.
The outlet as will be noticed is made of a very easy angle consistent with a
good water seal so as to afford every possible facility for the solids to leave the
syphon.
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 1
claim is :-
1. A syphon drain trap in which the dip portion is formed with a narrow channel
and the extremes thereof, of cylindrical section substantially as and for the purpose
described.
'
2. A syphon drain trap having a cylindrical inlet gradually contracted so as to
form a narrow channel at the dip portion and then gradually widened to a cylindrical
outlet substantially as and for the purpose described.
3. The improved construction of syphon drain trap substantially as described and
illustrated in the accompanying drawings.
Dated this 24th day of August 1893.
W. P. THOMPSON & BOULT,
Agents for the Applicant..