Improvements in Metal Traps and in Means for Connecting the same to the Waste Outlet of Baths, Slop Sinks, Lavatory Basins, and the like, applicable also to the Connection of other Metal Pipes for similar purposes.
Year: 1892

page_text: Date of Application, 19th Aug., 1892
Complete Specification Left, 19th May, 1893-Accepted, 24th June, 1893
PROVISIONAL SPECIFICATION.
Improvements in Metal Traps and in Means for Connecting the same
to the Waste Outlet of Baths, Slop Sinks, Lavatory Basins, and
the like, applicable also to the Connection of other Metal Pipes
for similar purposes.
I THOMAS ROBINSON of 127 Ramsden Road Wardle in the County of Lancaster
Plumber, do hereby declare the nature of this invention to be as follows:-
This invention relates principally to the construction of lead traps to be applied
to the waste pipes of baths, slop sinks lavatory basins, and in other places where
such traps are required, the object being to produce a more perfectly safe trap than
those which are cast in one piece as usual, and to provide the same with more
convenient means for connecting it to the pipes to which it is to be applied.
In the first place instead of casting the trap in the usual way I form the same
with an S trap is to be made in the shape of a vertical cylinder contracted at the
lower end to connect it to the waste pipe.
Near the upper end of this cylinder I cut a narrow slit sloping downwards in a
curve and about two thirds across the same and diametrically opposite to this slit
and below the same I cut a second one which commences preferably in a downward
direction and curves upwards until it passes above the level of the first slit and
about two thirds across the cylinder. I then pass sheets of milled lead of suitable
shape into these slits and I join them to the cylinder by "burning" or soldering
from the outside.
As the ends of these two sheets pass or overlap each other they will form a trap
inside the cylinder and as the midfeathers of this trap are of milled lead they will-
be without flaws or air holes which are liable to occur in cast metal traps as
now made.
In making a P trap I make the casing L shaped with a curved sump or dip at
its angle, and I cut a single slit from its inside corner reaching diagonally towards
the middle of the "sump" or dip and below the level of the bottom of the
horizontal limb of the trap I pass a piece of milled sheet lead into this slit and
burn or solder it fast therein as above described and I thus form the midfeather of
the trap.
It will be evident that the outside shape of both the S and P traps may be
varied so long as midfeathers of milled sheet lead can be fixed therein substantially
as above described.
The trap is attached to the bath slop sink or basin by a cover which is grooved
beneath to receive a rubber ring or other suitable washer and make a tight joint
with the upper end of the casing and this cover is provided with a central screwed
neck or boss which fits the metal tube or seating of the plug or waste escape
valve.
Two half rings are passed round this neck or boss and are connected together by
bolts which also connect them to a loose ring (either in one or in two parts) which
end
fits around the casing of the trap and beneath an external flange near the upper
thereof and thus the trap is fixed in place.
I sometimes fix upon the upper end of the trap a flanged boss or nut made with
lugs and a rim or ring above, into or onto which the cover fits, and I thus dispense
with the loose ring.
It will be evident that the means described for connecting the trap with the
metal bush or seating of the waste valve or plug may be applied to the connection
of the leaden or hard metal waste pipe to the contracted end of the trap; and the
same connections with very slight modifications may be applied for joining two

page_text: metal pipes together or for fitting a metal pipe to the bush or seating of the waste
valve or plug.
Dated this 18th day of August 1892.
GEO. DAVIES & SON,
4, St. Ann's Square, Manchester, Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Metal Traps and in Means for Connecting the same
to the Waste Outlet of Baths, Slop Sinks, Lavatory Basins, and
the like, applicable also to the Connection of other Metal Pipes
for similar purposes.
I THOMAS ROBINSON of 127 Ramsden Road Wardle in the County of Lancaster,
Plumber, 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 principally to the construction of lead traps to be applied
to the waste pipes of baths, slop sinks, lavatory basins, and in other places where
such traps are required, the object being to produce a more perfectly safe trap than
those which are cast in one piece as usual, and to provide the same with more
convenient means for connecting it to the pipes to which it is to be applied.
My invention will be readily understood from the following description on
reference to the accompanying sheet of drawings on which
Fig. 1 is a sectional elevation of an S trap and Fig. 2 a similar view of a P trap
made according to my invention.
Fig. 3 shews the application of my invention to the connection of metal pipes.
In the first place instead of casting the trap in the usual way 1 form the same
when an Strap is to be made in the shape of a vertical cylinder a contracted at
the lower end a¹ to connect it to the waste pipe.
Near the upper end of this cylinder
a
I cut a narrow slip sloping downwards in
a curve and about two thirds across the same and diametrically opposite to this
slit and below the same I cut a second one which commences preferably in a
downward direction and curves upwards until it passes above the level of the first
slit and about two thirds across the cylinder, I then pass sheets of milled lead a³
and a of suitable shape into these slits as shown on Fig. 1 and I join them to the
cylinder a by "burning or soldering from the outside.
"
As the ends of these two sheets a² a³ pass or overlap each other they will form
a trap inside the cylinder and as the midfeathers of this trap are of milled lead
they will be without flaws or air holes which are liable to occur in cast metal traps
as now made.
"
sump
"
In making a P trap see Fig. 2 I make the casing a a¹ L shaped with a
or dip a at its angle, and I cut a single slit from its inside corner reaching
diagonally towards the middle of the " sump or dip and below the level of the
bottom of the horizontal limb a' of the trap I pass a piece of milled sheet lead a
into this slit and burn or solder it fast therein as above described and I thus form
the midfeather of the trap.
It will be evident that the outside shape of both the S and P traps may be varied
so long as midfeathers of milled sheet lead can be fixed therein substantially as
above described.
The trap a is attached to the bath slop sink or basin by a cover a which is
grooved beneath to receive a rubber ring c or other suitable washer and make a
tight joint with the upper end of the casing a and this cover a is provided with a
central screwed neck or boss c¹ which fits the metal tube or seating d of the plug e
or waste escape valve.
Two half rings ƒƒ
are passed round this neck or boss c¹ and are connected
together by bolts g g which also connect them to a loose ring h (either in one part

page_text: see Fig. 1 or in two parts) which fits around the casing of the trap a and beneath
an external flange a' near the upper end thereof and thus the trap is fixed in place.
I sometimes fix (by soldering or burning) upon the upper end of the trap a a
flanged bossk (or a nut) made with lugs and a rim or ring above into or onto
which the cover a (as seen at Fig. 2) fits, and I thus dispense with the loose ring.
It will be evident that the means described for connecting the trap with the
metal bush or seating of the waste valve or plug may be applied to the connection
of the leaden or hard metal waste pipe to the contracted end a¹ of the trap; as
shown at Fig. 2; and the same connections with very slight modifications
applied for joining two metal pipes, (m and n) as shewn for example at Fig. 3,
n being the flanged boss (or a screwed boss or nut may be used) having lugs n
connected by the bolts n³ to a ring or two half rings in surrounding the grooved
flanged end m' of the pipe m. The india rubber ring or washer c makes a tight
joint as previously described with reference to Figs. I and 2.
may be
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. The construction of an S trap substantially as hereinbefore described and
illustrated by the annexed drawing.
2. The construction of a P trap substantially as hereinbefore described and
illustrated by the annexed drawing.
3. The means for connecting traps to the seatings of waste plugs or valves or to
waste pipes or for connecting metal pipes to such seatings or together substantially
as hereinbefore described and illustrated by the annexed drawings.
Dated this 17th day of May 1893.
GEO. DAVIES & SON,
4, St. Ann's Square, Manchester, Agents for the Applicant.