Improvements in Automatic Flushing Cisterns.
Year: 1889

page_text: Date of Application, 6th Sept., 1889
Complete Specification Left, 4th June, 1890-Accepted, 26th July, 1890
PROVISIONAL SPECIFICATION.
Improvements in Automatic Flushing Cisterns.
We, DAVID LAW, JOHN LAW Junior, JOHN LAW and JAMES LAW of the firm of
J. & A. Law of Pinkston Iron Works in the City of Glasgow, Ironfounders and
GEORGE GRANT, Brassfoundry Manager with said firm, do hereby declare the nature
of this invention to be as follows:-
This Invention relates to automatic flushing cisterns the contents of which are
periodically discharged by a syphon put into action by the automatic tilting or
upsetting of a hopper or vessel fed from the water supply pipe, and discharging its
contents into the cistern when the latter is full; and the improvements have for
object to insure reliable working of the hopper and proper syphonage with a
minimum supply of water above the normal overflow level.
The tilting hopper or vessel which is conveniently made of shallow triangular
form as seen in elevation and open at one end, is pivotted or centred on studs or pins
in the cistern and under its deeper closed end is formed or fitted a float which may
consist of a hollow chamber by ineans of which when the cistern reaches the normal
overflow level the end of the hopper is buoyed up sufficiently to tilt over the hopper
and discharge its contents the weight of the float being such as to bring back the
hopper to its normal position after each action.
The water level in the cistern which is filled by constant overflow of the hopper being
suddenly raised above the point of overflow by the emptying into it of the contents of
the hopper the syphon is put into action and the water in the cistern discharged.
In order that the syphoning action may be thus effected by a minimum water supply,
the syphon which is preferably formed on the end of the cistern is made of oblong
section and extremely narrow and to ensure driving out of air by the water over-
Howing through the syphon at the moment the syphoning action begins an incomplete
rap is formed in the discharge outlet from the syphon.
Dated this Fifth day of September 1889.
CRUIKSHANK & FAIRWEATHER,
62, Saint Vincent Street, Glasgow, Agents.
COMPLETE SPECIFICATION.
Improvements in Automatic Flushing Cisterns.
We, DAVID LAW, JOHN LAW, Junior, JOHN LAW and JAMES LAW of the firm of
J. & A. Law of Pinkston Iron Works in the City of Glasgow, Ironfounders, and
GEORGE GRANT, Brassfoundry Manager with said firm, 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 relates to automatic flushing cisterns the contents of which are
periodically discharged by a syphon put into action by the automatic tilting or
upsetting of a hopper or vessel fed from the water supply pipe, and discharging its
contents into the cistern when the latter is full; and the improvements have for object
to ensure reliable working of the hopper and proper syphonage with a minimum
supply of water above the normal overflow level.
As represented in longitudinal and transverse vertical sections of the flushing
cistern at figures 1 and 2 of the accompanying drawings the tilting hopper or vessel A
which is conveniently made of shallow triangular form as seen in elevation and open
at one end, is pivotted or centred on studs or pins B in the cistern C, and under
ts deeper closed end is formed or fitted a float D, which may consist of a hollow
chamber, by means of which when the cistern reaches the normal overflow level the
[Porce fid I

page_text: end of the hopper is buoyed up sufficiently to tilt over the hopper A and discharge
its contents the weight of the float being such as to bring back the hopper to its
normal position after each action.
The water level in the cistern, which is filled by constant overflow of the hopper
into which the water supply pipe F discharges being suddenly raised above the point
of overflow by the emptying into it of the contents of the hopper the syphon G is
put into action and the water in the cistern discharged. In order that the syphoning
action may be thus effected by a minimum water supply, the syphon G which is
preferably formed as shewn on the end of the cistern is made of oblong section and
extremely narrow and to ensure driving out of air by the water overflowing through
the syphon at the moment the syphoning action begins an incomplete trap His
formed in the discharge outlet I from the syphon.
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 combination of parts constituting the improved automatic flushing cistern
hereinbefore described with reference to the annexed drawings.
2. In an automatic flushing cistern a tilting hopper provided with a float at or
under its closed end substantially as and for the purpose set forth.
3. In an automatic flushing cistern the formation of a partial trap in the discharge
outlet substantially as and for the purpose set forth.
Dated this Third day of June 1890.
CRUIKSHANK & FAIRWEATHER,
62, Saint Vincent Street, Glasgow, Agents.