IMPROVEMENTS IN " FLUSHING CISTERNS OR APPARATUS FOR DRAWING OFF MEASURED QUANTITIES OF LIQUID
Year: 1885

page_text: I, SAMUEL BENJAMIN GOSLIN of Jewin Crescent in the City of London
Engineer do hereby declare the nature of my invention for "IMPROVEMENTS IN
"
FLUSHING CISTERNS OR APPARATUS FOR DRAWING OFF MEASURED QUANTITIES OF
LIQUID and in what manner the same is to be performed to be particularly
described and ascertained in and by the following statement:-
The object of my Invention is mainly to provide a flushing cistern of great
simplicity in its parts and which will deliver no more than a certain quantity of
water at each operation and this with quickness and certainty, and which under
no circumstance can give rise to continuous flow of water or as it is termed a
'standing waste."
My apparatus consists of a cistern preferably of metal supplied by a ball cock
from a main or other source. Into this cistern the shorter limb of a siphon is
inserted preferably in an inclined position, and this limb of the siphon has a bell
mouth at its lower end. The longer limb of the siphon is outside the cistern and
preferably vertical it terminates at a short distance below the bottom of the ci-tern
in an enlarged junction piece in which an air vent is provided. From this junction
piece a pipe passes to the place where the flushing water is required to be delivered.
There is also within the cistern a cylinder open at the top but closed at the bottom
with the exception of an outlet terminating in a nozzle piece directed into the bell
mouth upon the shorter limb of the siphon. An inverted cup of metal is inserted
into the cylinder fitting it loosely in the manner of a piston, and on the top of the
cup a weight is supported. A chain passes from the weight to a lever having a
fulcrum or support springing from the side of the cistern and another chain descends
from the other extremity of the lever to a pull or handle by which the apparatus
is actuated. The operation is as follows:-
:-
The cistern being full of water the weight is raised by the pull and then liberated
it then forces water out of the cylinder through the nozzle up the leg of the siphon
establishing therein a sufficient velocity of flow to carry the water over the bend
of the siphon and into the descending limb when the water in the cistern rises up
the short limb through the annular space between the jet and the bell mouth. The
siphon like action is thus established and the discharge takes place until the cistern
is empty. The cistern then refills and with it the cylinder and the siphon leg

page_text: within the cistern, the cup like piston however retains some air within it and this
acting as an air buffer renders the descent of the weight when it is next liberated
more efficient in imparting to the water the impulse necessary to start the siphon.
The air vent in the junction piece on the longer limb of the siphon is provided as
a precaution against the siphon like action being prematurely established as it
might be by the discharge of air through a long delivery pipe, when both the cistern
and the shorter limb of the siphon are filling.
In order that my said Invention may be most fully understood and readily
carried into effect I will proceed to describe the drawings hereunto annexed.
DESCRIPTION OF THE DRAWINGS.
Figure 1 is a longitudinal and vertical section of a flushing cistern or drawing off
apparatus constructed and arranged in accordance with my invention.
Figure 2 is an end elevation of the same. A is the cistern or capacity into which
the water is received. B is the ball cock by which the water is admitted and by
which it is shut off when the cistern is full. Any description of ball cock may be
employed.
The siphon is marked C and D. C being its shorter leg within the cistern and
terminating in a bell mouth and D its longer leg attached to the enlarged junction
piece E immediately below the bottom of the cistern. E¹ is an air vent in this
junction piece. F is a pipe passing from the junction piece, and leading the water
to the place where it is required for use. G is the cylinder within the cistern
and G the nozzle piece which serves as the outlet from the lower part of the
cylinder into the bell mouth of the siphon. H is the inverted cup serving as a
piston and moving freely in the cylinder, and I is a weight mounted on the top of
this cup. K is a chain passing from the weight to one end of a lever K* having its
fulcrum upon a bracket L fixed to the side of the cistern A. Mis a chain descending
from the outer end of.the lever and terminating at its lower end in a pull or handle
arranged in any convenient manner.
In a flushing cistern of this construction the flow of water can only be started by
the liberation of the weight after it has been previously raised and the flow can
only be started when the cistern is nearly full so that under no circumstance can
à continuous flow be established.
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. A flushing apparatus in which the discharge is determined by a jet of liquid
propelled into the ascending limb of a delivery siphon.
2. The combination in a flushing apparatus of a tank, a siphon having one leg
within and the other outside the cistern, and apparatus for imparting an impulse
to the liquid in the ascending limb of the siphon.
3. The combination in a dushing apparatus of a cistern, a siphon, and a cylinder
containing a loaded piston, which in its descent imparts an impulse to the liquid
in the ascending limb of the siphon.
Dated this 2nd day of-February 1985