IMPROVEMENTS IN DOUBLE SYPHONS FOR FLUSHING WATER CLOSETS, DRAINS, AND SEWERS
Year: 1884

page_text: WILLIAM DEVOLL 3, Boldmere Road Erdington near Birmingham in the
County of Warwick Engineer I do hereby declare the nature of my said Invention
for IMPROVEMENTS IN DOUBLE SYPHONS FOR FLUSHING WATER CLOSETS, DRAINS,
AND SEWERS, to be as follows
In the Specification of a Patent N° 3913, Feb. 26, 1884 which was accepted
March 25, 1884, I described an arraingement of two syphons whereby the water
from one syphon exhausts the air from and charges the other syphon, thereby
giving a much greater flush than with one syphon:
:
In that arraingement one syphon only is brought over the top of the cistern.
My present Invention relates to improvements in the construction and
arraingement of the syphons, whereby both the syphons may be brought over the
top of the cistern and joined together on the outside.
For this purpose I place in a suitable cistern two bent tubes or syphons A A 1
the short legs of which are inside the cistern and near the bottom. I then carry
the syphons or tubes upwards and over the top of the cistern, and then downwards
on the outside, and then unite them or join them together near the bottom of the
cistern, so that the junction B. of the two pipes terminates in and forms one outlet
or fall pipe C. as shewn on the accompanying Drawings.
If the water in the cistern be now caused to pass over the crown of the
syphon A 1 by means of any apparatus attached to the inlet, this water in decending
will exhaust the air from and so charge the other syphon A which is connected to
it, when both the syphons continuing to draw together, a greater flush is
obtained.
:
'
By this arraingement of a double syphon as shewn at Fig. 1. the water is drawn
over the top of the cistern by both the syphons, no holes being required in the
bottom of the cistern. For the purpose of charging the mouth D of the syphon A 1
I prefer to use an ordinary cylinder with a loosely fitting piston, but it may be
charged by means of a valve or by a closed cap, or improved air vessel as in
No. 3913. Feb. 26, 1884.
I also propose to cast the syphons or conduits in a piece with the cistern, so as
to cheapen the cost of manufacture in the manner shewn at Fig. 2.
:
;
Fig. 3 is an improved arraingement of a double syphon which may be fixed inside
a cistern, the long leg or fall pipe passing through the bottom of the cistern. The
mouth or inlet of this syphon may be 'charged by any of the means above
described.
De
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1100A

page_text: WILLIAM DEVOLL 3, Boldmere Road Erdington near Birmingham in the County
of Warwick Engineer I do hereby declare the nature of my Invention for
IMPROVEMENTS IN DOUBLE SYPHONS FOR FLUSHING WATER CLOSETS and in what
manner the same is to be performed, to be particularly described and ascertained in
and by the following stateinent :—
In the Specification of a Patent No. 3913, Feb. 26, 1884 which was accepted
March 25, 1884, I described an arraingement of two syphons, whereby the water
from one syphon, exhausts the air from, and charges the other syphon, thereby
giving a much greater flush than with one syphon. In that arraingement, one
syphon only is brought over the top of the cistern. My present Invention relates to
improvements in the construction and arraingement of the syphons, whereby both
the syphons may be brought over the top of the cistern and joined together on the
outside.
For this purpose I place in a suitable cistern, two bent tubes or syphons A A 1
the short legs of which are inside the cistern, and near the bottom. I then carry
_the_syphons_or_tubes_upwards_and_over_the_top_of_the_cistern, and then downwards
on the outside and then unite them or join them together near the bottom of the
cistern, so that the junction B of the two pipes, terminates in and forms one outlet
or fall pipe C as shewn on the accompanying Drawings. In the centre of these
two syphons I place a pipe C1 and connect the other end of the said pipe to a
small cylinder E inside the cistern for the purpose of charging the two syphions, or
double syphon as shewn at Fig. 1. Inside the cylinder is a loosely fitting disc or
piston F connected by a rod G to the lever H on one end of which is a balance
weight I for the purpose of returning the lever and disc or piston.
This cylinder has a small hole J which may be in the lower part of the cylinder
underneath the piston F for the purpose of admiting water underneath the piston.
The cistern having been filled by means of the ball tap K, if the lever be now
pulled down, the piston F will force the water (that has entered by the small
hole J,) out of the cylinder, into and over the top of the pipe C1. This water
falling in the centre of the junction B of the two syphons or double syphon, will
exhaust the air from both syphons, and thereby charge them. The water from
both the syphons, unites at the junction B and from thence falls into one fall pipe,
thereby giving a flush of greater velocity than can be obtained from one syphon.
By this arraingement of two syphons, joined together so as to form a double syphon
with one outlet, and having an intermediate charging pipe as C1-Fig. 1, the water
is drawn over the top of the cistern, and no hole for outlet pipe is required in the
bottom of the cistern, thus avoiding any possibility of leakage.
The syphons and cylinder may be formed in separate parts and joined together
in the cistern, in the manner shewn at Fig. 1 on the Drawings or in any simillar
manner, but I prefer to cast the cylinder and syphons, with the connecting pipe C 1
in one piece with the cistern so as to avoid joints.
Fig. 2 shews an improved double syphon, the same as herein before described, the
charging pipe of which, is here connected to an inclined pipe D which is continued
upwards inside the cistern as shewn at L and covered by an improved air vessel M
as here shewn at Fig. 2 and as described and illustrated by me in my Complete
Specification No. 3913 Feb. 26-1884. The action of this improved air vessel as
applied for the purpose of charging an improved double syphon of the kind and
form herein-before described, is as follows:-
The cistern having been filled by the ball tap K to the water line, the water
will be above the top of the vertical pipe L, but is prevented from rising inside

page_text: the improved air vessel M to the top of the vertical pipe, by the internal discs
or blades which confine the air and keep the water back, untill the air vessel is
raised by pulling down the lever when the air will be withdrawn and the water
rushing down the pipe L will displace the water in the inclined pipe by forcing it
over the crown of the charging pipe C1 (which is lower than the top of the
vertical pipe L) into the junction B of the two syphons, or double syphon and
from thence into the fall pipe C thus drawing off the air from the double syphon
and charging it, the effect of flushing force being the same as hereinbefore described
for Fig. 1. This arraingement also, has no outlet hole in the bottom of the cistern,
and may also be fitted together in parts or the syphons and pipes cast in one piece
with the cistern so as to avoid joints.
Fig. 3 shews an arraingement of an improved double syphon which may be fixed
inside any suitable cistern in the manner here shown, the mouth of which may be
charged by the same apparatus as herein before described, and as shewn at Fig. 1.
on the accompanying Drawings, or by means of the improved air vessel M or any
simillar means.
The action of this is the same as herein before described for Fig. 1. vic.—If
water be forced by any means into the mouth of the pipe D and over the bend of
the pipe C 1, this water when falling down the pipe C will draw off the air from
the two syphons or improved double syphon A A 1, and charge them. The water
from both syphons will then unite at the junction of the pipes and falling from
thence, into the one fall pipe C will give the same effect and increased flushing
power as hereinbefore described for Fig. 1.
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. The fitting or casting of cisterns used for the purpose of flushing water
closets, with two syphons, having open mouths inside the cistern, and continued
upwards and brought over the top of the cistern so as to avoid having a hole in
the bottom of the cistern, or below the top, and united together either on the inside
or on the outside of the cistern so as to form a junction of the two syphons,
terminating in one fall pipe or outlet, and having an intermediato charging pipe in
the centre of the two syphons, for the purpose of charging them, the said syphons
and intermediate charging pipe either formed in one piece with the cistern or in
parts fitted together and in any material, substantially as described and illustrated
at Figs. 1, 2 on the accompanying Drawings.
As I am aware that cylinders and pistons have been used before in cisterns for
the purpose of charging a single syphon, the said cylinders and pistons having,
valves, joints, or packing, I thereforo do not claim such an arraingement, but
I claim,
2. The combination in such cisterns as are fitted or cast with two syphons,
forming an improved double syphon as hereinbefore described, having an
intermediate charging pipe which is connected to a cylinder, having a piston,
operated by a lever having a ballance weight, the said cylinder having a small hole
in the lower part of the cylinder, underneath the piston to admit water for
charging, and having no valves, joints, or packing, formed and made as herein before
described and as shewn at Fig. 1 ellevation, sections, and plan, on the Drawings and
having the effect substantially as hereinbefore described.
3. The combination in such cisterns (fitted or cast with two syphons forming an
improved double syphon as hereinbefore described, and as shewn at Fig. 2, in
elevation, plan, and sections) with a vertical pipe which is surrounded, and covered
by an improved air vessel of the kind described and illustrated by me in my
Complete Specification No. 3913 Feb. 26-1884 and as herein before described, and
shewn at Fig. 2 on the accompanying Drawings, the said vertical pipe having at its
lower end, a bend or trap which is continued along the bottom of the cistern, and
thence up, into the centre of the two syphons for the purpose of charging them, as

page_text: shewn at Fig. 2 in elevation, plan, and section, and having the effect substantially
as hereinbefore described.
4. The fitting or casting of cisterns used for the purpose of flushing water
closets with an improved double syphon as herein before described and as shewn at
Fig. 3 in section, and charged and operated by either of the methods used in Fig. 1,
and Fig. 2, having the effect substantially as herein beforé described.
1
L.
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5. The manufacture and use of' the arraingements and combinations, as shewn at
Figs. 1, 2, 3, in elevation, plan, and sections, having the action substantially as
hereinbefore described.