Improvements in Flushing Cisterns and the like.
Year: 1897

page_text: Date of Application, 9th Mar., 1897
Complete Specification Left, 9th Dec., 1897-Accepted, 29th Jan., 1898
IUNAL DPECIFICATION.
Improvements in Flushing Cisterns and the like.
FREDERICK CHARLES LYNDE, 25, Cross Street, Manchester, Civil and Sanitary
Engineer, do hereby declare the nature of this invention to be as follows:-
The chief object of my invention is the prevention of the noise experienced, when
the water is discharged for the purpose of flushing closets, urinals and the like from
syphon and other cisterns.
I will now describe one method of carrying out my invention in connection with
a syphon cistern.
To any ordinary syphon cistern I apply a float or air ball in connection with
a tube or rod or other suitable arrangement. The rising and falling of the level
of the water in the cistern gives motion to the tube or rod or other suitable
arrangement, by the flotation of the float or ball and air is caused to be admitted
or shut off thereby through a tube or other means of communication to the syphon
or cistern outlet.
.
The air is admitted just before the water becomes wholly discharged by the
lowering of the float.
The air may be admitted to the intake leg or outlet leg of the syphon or both.
The suction of or the atmospheric pressure on the intake end of the syphon, which
is the cause of the noise experienced is thus stopped and the cistern is rendered
silent.
Dated this 8th day of March 1807
Improvements in Flushing Cisterns and the like.
FREDERICK CHARLES LYNDE, 25, Cross Street, Manchester, and Old Exchange,
King Street, Manchester, Civil and Sanitary 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:-
-
The chief object of my invention is the prevention of the noise experienced when
the water is discharged for the purpose of flushing closets, urinals and the like from
syphon cisterns and other cisterns to which my invention is applicable.
I will now describe one method of carrying out my invention in connection with
a fixed annular syphon and also the adaptation of the same for a moveable bell
syphon. It will be obvious that the apparatus may be adapted to an ordinary
syphon.

page_text: Fig. 1 is an outside elevation of the apparatus and Fig. 1ª represents the section
of the air inlet or valve when open riz.: when the float is at its lowest position.
The dotted lines thus
in both Figures 1 and 2, represent the position
of the syphon in each case. The invention consists of a float A having a rod or
tube B which fits into and slides within or without with a lateral or circular
motion, a tube C, and is provided with a slot or slots or openings, c³ c¹ forming
an air valve shewn at D Fig. 1.
The tube C is prolonged and formed into such a shape as may fit any particular
form of syphon, and its extremity F is terminated so that air may issue from it
into the syphon and destroy the vacuum and action of the syphon when the
water in the cistern descends to a certain level. This moment is just before the
air would be forced under the short end of the syphon, which would cause the
objectionable noise, but which is prevented by the automatic inlet. of air through
the tube C. when the valve D is open.
In its normal position the float A is maintained in an upward position, and the
valve is kept closed, by the flotation of the float.
When the cistern is actuated and the water descends, the float remains in it
upward position until, the amount of water becomes insufficient to support it,
therefore it falls and opens the air valve D Fig. 1^.
The result is that the air passes through the tube C into the syphon and stops
its action, just before the objectionable noise caused by the forcing of the air
through the water into the shorter leg of the syphon would occur, which it thus
prevents.
When the cistern becomes partly full of water the float rises and closes the
air valve, and the apparatus is ready to prevent noise again in a similar manner.
Fig. 2 shews the invention adapted to a moveable bell syphon, the same
description as above applies.
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 use and manufacture of the apparatus substantially as described and
illustrated in the annexed drawings.
2. The automatic admission of air into the long leg of a syphon or into the
inner tube of an annular or bell syphon substantially as described and illustrated
in the drawings, Fig. 1, Fig. 1, Fig. 2 and Fig. 2*.
Dated this 8th dow of December 1897.