AN IMPROVED DOUBLE SYPHON 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 invention
for AN IMPROVED DOUBLE SYPHON FOR FLUSHING WATER CLOSETS, DRAINS
AND SEWERS and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement :-
In a suitable cistern of the shape or configuration shewn at A. on the
accompanying Drawings. I fix a vertical pipe Band continue the said pipe along
the bottom of the cistern either on the inside or on the outside of the cistern in the
manner shewn at C. Over the top of the vertical pipe B I place an air vessel of the
shape or configuration shewn at D. the crown of this air vessel being above the top
of the vertical pipe B. At the lower end of the air vessel are four feet D 1 on which
it rests at sufficient distance from the bottom of the cistern to allow water to enter
as shewn at D 2. On the inside of this air vessel, and forming a part of it, are two
blades or Discs E E which extend from side to side of the air vessel, and are
formed at an angle with the vertical pipe B as shewn on the Drawings. A hole is
formed in the centre of each blade sufficient to allow water to pass through to the
top of the pipe B when set in motion. The top of the air vessel is connected to a
lever K, by which it can be raised or lowered as shewn. In the opposite end of
the cistern I also fix a Syphon pipe F and continue this pipe over the top of the
cistern and down the outside as F1. untill it forms a junction with and is connected
to the other pipe C, in the manner shewn at G. This pipe is then continued
downwards as shewn at H and ends with a connection for the fall pipe. I is an
ordinary ball valve..
The action is as follows,
The cistern having been filled by the ball valve, the water now rises in the air
vessel untill it reaches the edges of the blades or Discs E E, and confines the air
underneath them, thus forming adittional air vessels round the interior of the
air vessel D.
The air thus compressed underneath the blades by the pressure of the water in
the cistern, keeps back the bulk of the water tending to rise in the air vessel.
By making the air vessel D of the shape or configuration shewn on the Drawings,
a greater area is obtained in the crown or upper part, than at the mouth; and the

page_text: .
quantity of air compressed in the crown, prevents any water that has passed
through the holes in the centre of the blades, from rising to the top of the pipe B,
as long as the vessel remains at rest. The cistern being now full, if the lever K be
pulled down by means of the chain, the air vessel will be raised a short distance,
and the air within being thus removed farther from the water, allows the water to
rise to and run down the pipe B. The air having now been withdrawn from the
air vessel by means of the water rushing down the pipe B, a syphon action is
thereby formed by the pipe B and the air vessel. The water from this syphon,
falls into and passes through the pipe C untill it reaches the junction G when it
rushes down the fall pipe H, and this water by its descent, exhausts or draws off
the air in the other syphon pipe F, and thereby immediately sets it in motion.
Both the syphons now continue to draw together from the cistern and pass their
water into the one fall pipe. H untill the cistern is empty, thereby giving a greater
and more rapid flush than can be obtained from a single syphon.
After the two syphons have ceased running, water will still remain in the elbow
of the pipe C, the fall or dip of which, is equal to the Diameter of the pipe, so as to
form a trap, or pipe full of water, for the purpose of instantly charging the other
Syphon F, in the manner above described..
J J are the feet or supports on which the cistern rests.
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,
1st. That an air vessel of the shape and configuration shewn at D and having
internal blades E E formed in the manner shewn on the drawings and here
described, and surrounding and covering an internal pipe as B, forms an improved
syphon, and is (for the purpose of forming an improved syphon). New and Novel.
2nd. That by connecting the leg or fall pipe of this syphon, to the leg or fall
pipe of the other syphon F, F1 by means of the bend pipe C, in the manner
shewn at G, so as to start the syphon F F1 with the water from the other
syphon D. B. E E.. is, for the purpose of An Improved Double Syphon, for flushing
Water Closets, Drains, and Sewers, New and Novel.
'
3rd. That the syphons may be made of any material and in seperate parts, fitted
together, or they may be formed or cast in one piece with the cistern as shewn.
4th. That an Improved Double Syphon formed or made in the manner here
described in this Specification and as shewn on the accompanying Drawings and
made or used for any purpose is New and Novel.
Dated this 19th day of February 1884.