Improvements in Syphonic Discharge Water Closets.
Year: 1896

page_text: Date of Application, 7th Jan., 1896
Complete Specification Left, 26th Sept.. 1896-Accepted, 2nd Jan., 1897
Improvements in Syphonic Discharge Water Closets.
THOMAS HOLT, Junr. Science Demonstrator of 63 St. Donatt's Road,
New Cross, London, S.E. and STEPHEN HOLT, Engineer of 1 Oxford Street,
Liverpool do hereby declare the nature of this invention to be as follows:-
The water closet basin is in shape ou plan circular or oval and in vertical
section the bottom part is a flattened semicircle and has the usual flushing rim and
arm pipe.
In about the centre of the bottom of the basin is an outlet for the discharge of
the contents into a trap which is of the S shape.
From this outlet the trap rises as soon as convenient and then turns down, which
it must do at its full size a short distance beyond the lip or outgo of the trap and
the area of the trap must be about constant in its whole course.
To this turu down end of the trap is attached a waste or soil pipe of any
convenient length but of less area than that of the trap, the soil pipe being tapered
to meet the trap.
A second trap in some cases is fixed on the soil pipe and in that case an air or
ventilating pipe is fixed on the soil pipe between the two traps.
Instead of making the soil pipe circular one of an oblong or oval form will in
many cases be adopted.
It is arranged that the flush pipe must enter the basin so as to create a vortex
and this with the aid of the hemispherical shape of the basin will keep nearly all
the water in and high up in the basin until nearly all the water in the flush pipe
is discharged into the basin then the water quickly falls down in the basin and
passing through the trap floods the soil pipe and syphonic discharge follows.
To ensure a regular supply of flushing water and to make good any loss in the
seal of the trap the cisteru named in Patent No. 820, 1891, is preferred.
Dated this 6th day of January 1896.
THOMAS HOLT, JUNR.
STEPHEN HOLT.
Improvements in Syphonic Discharge Water Closets.
We, THOMAS HOLT, Junior, Science Teacher, of 63, St. Donatt's Road,
New Cross, London, S.E., and STEPHEN HOLT, Student, of 1, Oxford Street,
Liverpool, 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 shape of the water closet basin is in plan circular or oval, and in vertical
section the bottom thereof is a flattened semi-circle.

page_text: Round the edge of the basin is formed a gutter or channel which may be either
within or without the basin.
Covering this gutter or channel is placed the flushing rim, which is so disposed
relatively to said channel as to form one continuous or several openings therefrom.
The arm pipe joins the channel, and from said arm pipe and channel is formed a
weeping hole.
To allow of the discharge of the contents of the basin, there is a hole or passage
of suitable size in the flattened bottom of the basin, and the edge of this hole is
rounded off. This discharge hole or outlet proceeds downward a short distance
and then rises until the amount of trap desired is obtained, and then turns down
at once and forms the outgo of the trap, and the area of the trap must be about
constant throughout its course.
That the weir of the trap outgo may be parallel with the surface of the water
in the basin, the transverse section of the trap is rectangular or any other section
that will adinit of the weir being as described, and the angles or corners of the
trap are rounded off-though this latter is not imperative.
From the weir or turn down f the trap begins the waste or soil pipe, and the
latter should not be more than one half of the area of the trap. The junction
between the trap nil the soil pipe should be well tapered and bill mouthed.
In some cases, in order that the trap may be fully charged or drowned when
discharging, an elbow is formed on the soil pipe at any suitable point; but where
the area of the trap is considerably greater than that of the soil pipe then the
elbow may not be required.
By preference we use as a flushing cistern the one described in the Specification
of Letters Patens No. 820 of 1891.
In the accompanying drawing Figure 1 represents a vertical section through
the basin, trap, soil pipe, and other parts, Figure 2 is a section on line A. B., and
Figure 3 is a section on line C. D., and will, with the following description, more
clearly explain the nature of the invention.
A is the basin.
B
"
"
flushing rim.
"
C
F
G
CHIKLS
وو
channel or gutter.
arm pipe.
weeping hole.
Hattened bottom.
passage from basin to trap.
"
"
"
"
"
"
"
"
trap.
27
"
"
"
"
"
lip or weir of trap.
tapered junction of trap and soil pipe.
soil pipe, or long leg of syphon.
passage from the channel to the flushing rim.
assage from the flushing rim to the basin.
Supposing the basin A is connected to a suitable flushing cistern, and the basin
and trap H charged with water, then when water is admitted to the flush pipe it
will enter the arm pipe D and from there flow into the channel C and from there
pass through the passagen, under the flushing rim B, aud thence through the
passage o into the basin."
The inertia of the contents of the trap H and the basin A prevents the water
from passing away at once into the soil pipe L until a sufficient head of water
exists in the basin. Then the water passing freely through the trap H and over
the weir at once drowns or floods the soil pipe or long leg L of the syphon,
which it easily does because the area of the trap H is so much larger than that of
the soil pipe 1, and so sets up a syphonic action, which discharges the contents of
the basin. Then as soon as air enters the ingo of the trap H the sy phonic power
of the soil pipe L is destroyed, and the greater part of the water remaining in the
trap H falls back and makes good the seal of the trap.
The final portion of water entering the chaunel C from the arm pipe D, not

page_text: being able to pass through the passage n it falls back to the arm pipe D anl
passes through the weeping hole E into the basin A and adds a further amount of
seal to the trap H, and to this has to be added the water coming from the cistern
as an after flush. This amount of seal is increased by the water that lay upon the
flat bottom F and that could not enter the mouth or ingo of the trap before the
syphonic power of the trap was destroyed, and this is one of the purposes of the flat
bottom F.
The flattened bottom F is also a check upon the water leaving the basin and
thereby helps to increase the head of water in the basin. And in the case of
slops or other liquids being thrown into the basin, its flattened bottom F by the
momentary resistance it offers, prevents the destruction of the seal of the trap.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, we declare that what
we claim is:
1. The syphonic water closet basin herein described and illustrated in the
annexed drawing, the characteristic features of which are, a flattened bottom, a
central discharge therein, a gutter around the rim of such basin which is covered
by the flushing rim, a continuous or several passages between said gutter and rim
for the discharge of water, and a weeping hole adapted to drain residual water
from the gutter and the arm pipe into the basin; all combined and adapted to
operate in the manner herein described.
2. The combination with a water closet basiu, of a gutter around the rim
thereof, said gutter being disposed either within or without the basin and covered
by the flushing rim, and whose function is to retain a residuum of flushing water,
which, ou draining through a weeping hole, forms an after flush or portion of an
after flush, substantially as described.
3. For the purpose of a syphonic water closet, the combination of a trap,
forming the short leg of a syphon and having a cross section approximating a
rectangle and a horizontal weir, with a soil pipe, forming the long leg of the said
syphon, whose area is considerably smaller than that of the said trap, whereby
the flooding or drowning of the syphon is assured at the commencement of
discharge, substantially as described.
4. The combination of a water closet basin having a flattened bottom, a central
discharge aperture therein, and a flushing water gutter around the rim of said
basin, with a trap having a cross section approximating a rectangle and a
horizontal weir, and discharging into a soil pipe of considerably smaller area than
said trap; arranged and adapted to operate substantially in the manner herein
described with reference to the annexed drawing.
1006
J. A. COUBROUGH,
Registered Patent Agent (qual. by exam.),
10, St. George's Crescent, Liverpool, Agent for the Applicants.