Improvements in or relating to Waste Preventing Cisterns.
Year: 1891

page_text: Date of Application, 14th Feb., 1891
Complete Specification Left, 14th Nov., 1891-Accepted, 2nd Jan., 1892
PROVISIONAL SPECIFICATION.
Improvements in or relating to Waste Preventing Cisterns.
I, WILLIAM DUNDAS SCOTT-MONCRIEFF of 86 Newman Street Oxford
Street London W. Engineer do hereby declare the nature of this invention to
be as follows:-
This invention has for its object an improvement in the mechanism of waste-
preventing cisterns, which enables them to be made in a simpler method than
hitherto and at a reduced cost in manufacturing the same.
To this end I make use of an ordinary drop-valve provided with a leather or
other suitable washer, fitting upon a proper seating, the raising of which starts a
syphon in the usual manner, but instead of an ordinary spindle fixed to the pull up
attachment, I carry up the spindle & terminate it with a disc or piston and over
this I slip a loosely fitting cylinder open at the bottom but with a cover on the top
of it, which is attached to the pull up mechanism.
This cylinder cover is provided with a very small air hole drilled through it.
When the handle or pull apparatus is released the loose cylinder drops down by
its own gravity until it rests upon the before mentioned disc or piston on the valve
spindle, but when the cylinder is raised by the pull lever or other mechanism a
partial vacuum is formed between the disc on the valve spindle and the upper part
of the cylinder. This is sufficient to lift the valve and start the syphon which
empties the cistern, but as the level of the water falls the vacuum between the disc
and the top of the loose cylinder is destroyed and the pull up mechanism only
moves the loose cylinder up & down without moving the drop valve, which must
remain closed until the cistern is refilled, when a pull up of the loose cylinder will
again lift the drop valve by means of the aforesaid partial vacuum.
In this way
all the conditions of a good waste preventing apparatus are fulfilled in a very simple
and efficient manner.
By another modification possessing considerable advantages I make the loose
cylinder open at the top, but with a bottom cover through which the valve spindle
& disc before described work easily.
By this arrangement when the pull up mechanism is released the cylinder falls
by its own gravity in such a manner that there is a plug or body of water between
the bottom of the cylinder and the disc of the valve spindle and as this water
cannot be suddenly expelled when the pull up takes place the cylinder raises the
disc and valve sufficiently to start the syphon, but when the cistern is empty the
confined plug of water pours away through the loose fitting spindle in the bottom
of the cylinder so that the pull up only moves the cylinder, without raising the
valve until the cistern is again charged with water, when the drop valve, can be
again lifted by the cylinder as before described.
Deted this 11th of 1001
COMPLETE SPECIFICATION.
Improvements in or relating to Waste Preventing Cisterns.
1, WILLIAM DUNDAS SCOTT-MONCRIEFF of 86 Newman Street, Oxford
Street, London W. Engineer, 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 for its object an improvement in the mechanism of waste-
preventing cisterns. To this end I make use of an ordinary drop-valve (provided

page_text: with a leather or other suitable washer fitting upon a proper seating) the raising of
which starts a syphon in the ordinary manner; but instead of an ordinary spindle
fixed to the pull up attachment I carry up the spindle of the valve and terminate
it with a disc or piston and over this I fix a loosely fitting cylinder open at the
bottom but with a cover on the top of it to which is attached the pull up mechanism.
By another modification possessing considerable advantages I make the loose
cylinder open at the top but with a bottom cover through which the valve spindle
works easily. The first arrangement is shewn on Fig. I. which represents a
sectional view of the apparatus in which 1. is the syphon constructed as shewn-
2. is the drop valve-3. the loose cylinder attached to the lever 4. working on the
fulcrum 5. and actuated by the pull 6. The action of the apparatus takes place by
the disc or piston 7. being drawn up by the suction of the loose cylinder-the valve
dropping back (when the water has left the cistern) by its own gravity even when
the pull down attachment remains at its lowest position.
Fig. II. represents a sectional view of the apparatus in which the loose cylinder 3.
is reversed the valve being raised by the plug of water between the bottom of the
cylinder 8. and the disc 7. instead of by the suction as already described in Fig. I.
the valve dropping back by its own gravity as the plug of water leaks away;
thus providing a waste-preventing apparatus as in the previously described
improvement.
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-
I. The combination of parts substantially as described and shewn in Fig. I.
II. The combination of parts substantially as described and shewn in Fig. II.
Dated this 14th day of November 1891.
W. D. SCOTT-MONCRIEFF.