Improvements in or relating to Air Seal or Water Valve Devices for Syphon Discharge Fittings and the like.
Year: 1898

page_text: Date of Application, 14th Oct., 1898-Accepted, 3rd Dec., 1898
Improvements in or relating to Air Seal or Water Valve Devices for
Syphon Discharge Fittings and the like.
I, STEWART ROBERTSON, of 55, Yeaman Shore, Dundee, in the County of Forfar,
Scotland, Sanitary Engineer and Merchant and Agent for Sanitary Appliances,
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 improvements in air seal or water valve devices of the
type set forth in my prior Patent, No. 24,981 of 1896, for " Improvements in
syphon discharge fittings for water closets, baths, sinks, lavatory basins, and the
like." The object of my present invention is to improve and facilitate the con-
struction of the parts referred to in my said patent as causing the air seal, and
to render their action more certain and effective.
In order that my invention may be the better understood, I have hereunto
appended an explanatory sheet of drawings, in which the same reference letters
denote the same or like parts where shown, and in which the several figures repre-
sent in sectional elevation the various modifications hereinafter described.
In carrying out my invention according to one modification as shown more
particularly by Figs. 1, 2, and 3, I form a chamber M, in the longer or down
tube N, of the syphon or other discharge fitting, preferably by enlarging such tube
so that its cross-section becomes an oval, circle, or like figure of greater area
than that of the following part of the tube. Such enlargement may be confined
to the said down tube, as in Figs. 2, and 3, or it may be carried back to the vessel
which is to be emptied, as in Fig. 1. In such enlarged part or chamber I fit,
attach, or form one or more projecting pieces or parts F, and G, of suitable form,
whose function is to produce the air seal or water valve, substantially in the
manner made known in my aforesaid prior specification but which are materially
assisted in such function, by the improved conformation and disposition of the
parts now shown. Thus, in Fig. 1 the discharged fluid impinging on F, is by
it deflected to the upper part of G, so tending to set up the air seal A, in the manner
set forth in my said prior specification: or by the combined processes of falling
and deflection, to set up the seals B, and C, or others in series, according to the
number of opposite parts or pieces F, and G, employed in combination one with
the other, or with the bend or bends made by the enlargement or diminution of
the tube.
In other modifications I attain the same effects by placing the projecting parts
or pieces in a bellied and cranked tube as in Fig. 4; in a tube whose diameter
diminishes below the parts as Fig. 5; or in a cranked tube of uniform diameter,
as in Fig. 6. It will also be obvious that a simple and effective equivalent for
any of the foregoing or like forms of construction, may be made by indenting
or corrugating the tube substantially as shown by Figs. 7 and 8.
The projecting parts or pieces may be made of single thickness, or hollow or
solid according to the material of construction employed; they need not he of the

page_text: precise form shown in any of the figures provided they properly deflect the fluid;
and by making the bend of the syphon more acute than usual as shown at Fi
in Figs. 6 and 7, such bend may act as a substitute for one of the pieces or parts.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I wish it to be clearly
understood that I do not limit myself to the precise details of construction herein
set forth, but that I hold myself free to make such modifications as conform with
the spirit and scope of my invention, and I declare that what I claim is:-
(1) In air seal or water valve devices for syphon discharge fittings and the
like, the combination and arrangement of parts consisting of internally projecting
pieces or parts combined with suitable bends or enlargements in their containing
tube, for the purposes herein before set forth and substantially as illustrated by
Figs. 1 to 6 inclusive of the accompanying drawings.
(2)In air seal or water valve devices for syphon discharge fittings and the
like, the external indentation or corrugation of the tubes to produce internal
conformation and effects equivalent to those above claimed, substantially as
illustrated more particularly by Figs. 7 and 8.
Dated this Eleventh day of October 1898.
STEWART ROBERTSON,
Applicant.