Improvements in or connected with Drain Stoppers.
Year: 1893

page_text: Date of Application, 30th Oct., 1893
Complete Specification Left, 18th July, 1894-Accepted, 8th Sept.. 1894
PROVISIONAL SPECIFICATION.
Improvements in or connected with Drain Stoppers.
I, SCOTT ADDISON, of 15 Mostyn Road, Bow, in the County of Middlesex,
Sanitary Engineer, do hereby declare the nature of this invention to be as
follows:-
This invention relates to the stoppers or plugs used for testing drains and other
purposes and has for its objects to prolong the life of the rubber portion of such
stoppers and to ensure a more perfect joint between the said rubber and the
drain pipes.
Now according to this invention on one plate preferably that attached to the
screw I form a ring which slides into or out of a corresponding recess in the loose
plate this ring prevents the rubber from getting out of place in case the said plates
should be too widely separated.
The rubber ring I form preferably of an approximately semi-circular section
with a projecting portion the whole forming a ring or collar approximating in shape
to the letter P in section the head of the P being held between the bevilled edges
of the plates while the flat portion projects into the pipe forming an hydraulic
collar.
By this means a more secure joint is made between the rubber and the pipe than
when the joint is made by simply forcing the rubber against the internal surface of
the pipe by drawing the plates together.
The fixed plate is attached to a hollow screw in the usual way the said screw
being provided with a nut working against the loose place and the usual cap and
washer.
The nut and cap are made of a different metal from that of which the screw is
composed to prevent them from becoming rusted together.
Dated this 30th day of October 1893.
T. E. HALFORD,
11, Furnival Street, Holborn, London, E.C., Agent for the Applicant.
COMPLETE SPECIFICATION.
Improvements in or connected with Drain Stoppers.
I, SCOTT ADDISON, of 15 Mostyn Road, Bow, in the County of Middlesex
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 :-
This invention relates to drain plugs or stoppers used for testing drains and
other purposes and has for its object to prolong the life of the rubber portion of
such stoppers and to ensure a more perfect joint between the said rubber and the
interior of the drain pipes.
Now according to this invention on one plate preferably that attached to the
screw I form a ring which slides into or out of a corresponding recess in the loose
plate this ring prevents the rubber from being displaced in case the said plates
should be too widely separated.
The rubber ring I form preferably of an approximately semi-circular section
with a projecting portion the whole forming a ring or collar approximating in shape

page_text: to the letter P in section the head of the P being held between the bevilled edges
of the plates while the flat portion projects into the pipe forming an hydraulic
collar but I may use a ring of any other suitable section.
By this means a more secure joint is made between the rubber and the pipe than
when the joint is made by simply forcing the rubber against the internal surface of
the pipe by drawing the plates together.
The fixed plate is attached to a hollow screw in the usual way the said screw
being provided with a nut working against the loose plate and the usual cap and
washer.
The nut and cap are made of a different metal from that of which the screw is
composed to prevent them from becoming rusted together.
- 1
And in order that my said invention may be fully understood I will proceed to
explain the same with reference to the accompanying drawings in which :-
Figure 1 represents a drain plug or stopper constructed according to this
invention.
Figure 2 is plan of same.
Figure 3 is longitudinal section of same.
Figure 4 is elevation of a modified form of drain stopper also constructed
according to this invention.
Figure 5 is plan of same and
Figure 6 is longitudinal section of same.
The same letters denote the same parts in all the figures.
a is a plate of cast iron or other suitable material attached to a hollow screw /
also of any suitable material such as for example a piece of wrought iron tube is
a plate of any suitable material preferably attached to or made in one with a
sleeved sliding on the screw b.
fis a nut of gun metal or other material which will not become attached to the
screw through oxidation.
This nut is provided with handles g g by means of which it is rotated. h is a cap
of similar material to the nut having a washer i of rubber leather or other suitable
material to prevent leakage. j is a ring attached to a string or chain to prevent it
from being washed away when the water is let out of the drain.
The plate a has formed thereon a ring a' which slides into and out of a recess c¹
in the plate c; this ring prevents the india-rubber packing ring m from dropping
down in case the plates a and c should be too widely separated.
The packing-ring m of india-rubber or other suitable elastic material is
approximately P shaped in section as shewn the portion m being held between the
plates a and c and forced outwards when the plates are drawn towards each other
and the portion m³ which projects beyond the plate a forming an hydraulic collar
which ensures a watertight joint between the packing ring and the inside of the
drain pipe.
According to the modified form of the apparatus shewn in Figures 4. 5. and 6 the
ring a is dispensed with and the plates a and c may be similar and studs or pins a¹
inserted into the plate a as shewn or into the plate c; these studs slide easily
through holes formed in the other plate nuts or pins o o being provided to prevent
the plates from being too widely separated.
The packing ring may also be of the section shewn partly in full and partly in
dotted lines Figure 6.
The packing rings as hereinbefore described may be applied to the ordinary
drain plug with bevilled plates.
I am aware that drain plugs have hitherto been made with bevilled plates and a
flexible packing ring I do not therefore claim this combination but
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 I
claim is :-
1. In a drain plug or stopper the combination of a plate having a ring formed

page_text: thereon and a plate having a recess therein to receive the said ring with an elastic
packing ring and a means of drawing the plates together or separating them
substantially as described and shewn.
2. In a drain plug or stopper the packing ring m of approximately P section for
the purpose stated.
3. In a drain plug the combination of a plate having studs or pins therein with a
plate having holes therein to receive the said pins and an elastic packing ring for
the purpose stated.
4. The constructions of drain plugs or stoppers as shewn by the accompanying
drawings.
T. E. HALFORD,
11, Furnival Street, Holborn, London, E.C., Agent for the Applicant.