A New or Improved Double Seal Drain Trap.
Year: 1896

page_text: Date of Application, 7th Oct., 1896
PROVISIONAL SPECIFICATION.
A New or Improved Double Seal Drain Trap.
We, HENRY JOHNSON, of Trindle Road, Dudley, in the County of Worcester,
Consulting Mining Engineer, and JOSEPH HAMBLET, of West Bromwich, in the
County of Stafford, Brick, Tile, Pipe, Ridge and Terra Cotta Manufacturer, do
hereby declare the nature of this Invention to be as follows:-
This Invention consists of the herein described new or improved double seal
drain trap which is designed to effectually prevent the trap water from being
removed from the trap by the inrush of air when the sewer is being flushed as is
often the case with the single seal drain traps at present in use.
A double seal drain trap constructed according to this Invention has the water
passage or water passages so arranged as to form two traps or water seals one
below the other connected together by an upright pipe or passage so that the
water overflowing from the top trap runs down this pipe or passage into and
through the bottom trap. At the top of the upright pipe there is or may be a
float valve or ball which automatically closes the pipe when the flush in the
sewer tends to draw the water out of the trap to break the seal. The upper trap
may be and by preference is U-shaped with an inlet from the down spout or loose
grid at one end of the U. At the other end of the U there is the vertical pipe
connecting with another U or bend below the outlet which latter is sufficiently
high to form the required water seal in the bottom U or trap. The top of the
vertical pipe forms a seating for the float valve or ball which may be in the form
of a light hollow metallic ball which rests upon the top of the upright pipe at
the level of the water in the top of the trap.
Water entering the top trap passes along the U-shaped part and down the
vertical pipe as the buoyancy of the float valve or ball causes the same to lift
as the level of the water rises. The water then passes through the bottom trap
and away to the sewer.
Any flush in the sewer tending to draw the water out of the seals closes the
float valve or ball down on the top of the upright pipe and thus prevents the water
from the upper trap flowing down the pipe into the bottom trap and the water in
the latter is also prevented from being sucked out.
The said float valve or ball may if desired be dispensed with and in that case
if a flush in the sewer should draw the water out of the bottom trap the water
from the top trap will be drawn down into the bottom trap and thus maintain
the seal.
The top of the vertical pipe may be provided with a removable screwed or other
cap to enable the float valve or ball to be readily removed and the trap cleaned out.
The float valve or ball may if desired be arranged with a spindle passing down
the vertical pipe to a float on the water in the bottom trap so that under normal
conditions when the water in the traps is at its proper levels the float maintains
the said valve. open but when a flush takes place in the sewer and lowers the
level of the water in the bottom trap the float and valve fall with the water and

page_text: close the top of the vertical pipe thus preventing the water from being drawn out
of the top trap.
The said trap may be made in clay, porcelain, metal or other suitable material
and the said passages may take various forms and the trap be made in one or
more parts as may be found most convenient for manufacture and for purposes of
arresting solid matter and cleansing the same.
Although we have described the Invention as applicable to ordinary domestic
drainage it may be similarly applied for other drains and like purposes.
Dated this 6th day of October 1896.
CHARLES BOSWORTH KETLEY,
Agent for the Applicants.
Deal Drain Trap.
We, HENRY JOHNSON, of Trindle Road, Dudley, in the County of Worcester,
Consulting Mining Engineer, and JOSEPII HAMBLET, of West Bromwich, in the
County of Stafford, Brick, Tile, Pipe, Ridge and Terra Cotta Manufacturer, 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 consists of the herein described new or improved double seal
drain trap which is designed to effectually prevent the trap water from being
removed from the trap by the inrush of air when the sewer is being flushed as
is often the case with the single seal drain traps at present in use.
A double seal drain trap constructed according to this Invention has the water
passage or water passages so arranged as to form two traps or water seals one
below the other connected together by an upright pipe or passage so that the
water overflowing from the top trap runs down this pipe or passage into and
through the bottom trap. At the top of the upright pipe there is or may be a
float valve or ball which automatically closes the pipe when the flush in the sewer
tends to draw the water out of the trap to break the seal. Any flush in the sewer
tending to draw the water out of the seals closes the float valve or ball down on
the top of the upright pipe and thus prevents the water from the upper trap
flowing down the pipe into the bottom trap and the water in the latter is also
prevented from being sucked out.
In the accompanying drawing Fig. 1 represents in vertical section a double
seal drain trap constructed in accordance with this Invention; Fig. 2 is a plan of
the same and Fig. 3 is an end view of the same.
The same letters of reference indicate the same or corresponding parts in all
the figures.
A is the upper trap made of somewhat of a U-shape with an inlet a from
the down spout or loose grid at one end of the U; B is the vertical pipe at the
outlet end of the strap A connecting with the other U or bend C below the outlet c'
of the trap, which outlet c is sufficiently high to form the required water seal
in the bottom U or trap C. In the top of the vertical pipe B there is a valve
seating for the float valve or ball D which is by preference made in the form
of a light hollow metallic hall adapted to rest upon the seating b at the level
of the water in the top trap A. This float or valve B is by preference provided
with a light spindle d' passing down the vertical pipe B to a float E on the
water in the bottom trap C so that under normal conditions when the water in

page_text: the traps is at its proper levels as shewn in Fig. 1 the float E maintains the
valve D raised and open.
The action of the trap is as follows:-The water entering the inlet a¹ passes
along the U-shaped part A and under the valve 1) and down the vertical pipe B
and along the bottom trap C and away through the outlet c', the water in the
bottom trap C raising the float and valve 1) so that the water can flow from
the upper trap A down the vertical pipe B. A flush in the sewer which would
tend to draw the water out of the seals A and C lowers the level of the water
in the bottom trap C thereby causing the float and valve D to fall with the
water and close the top of the vertical pipe B thus preventing the water from
being drawn out of the top trap A. Also by the valve D closing upon its
seating 6 the water is prevented from being sucked out of the bottom trap C. F
is a grating to prevent any mud or solid matter from passing down the vertical
pipe C. G is a cap at the top of the trap above the vertical pipe B to enable
the float valve D E to be readily removed and the trap cleaned out.
The float valve or ball for closing the pipe B may be dispensed with, and in
this case if a flush in the sewer should draw the water out of the trap C the water
in the top trap A will be drawn down into the bottom trap C and thus maintain
the seal.
The trap above described may be made of clay porcelain metal or other suitable
material and it will be understood that the passages may take other forms than
those shewn upon our drawing and the trap may be made in one or more parts
as may be most convenient for manufacture and for the purpose of arresting solid
matter and leansing the same.
Although we have described "our Invention as applied to ordinary domestic
drain traps it is to be understood that our Invention may be similarly applied for
other drains and like purposes.
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. A double seal drain trap constructed essentially of two traps or water seals
one below the other connected together by au upright pipe or passage so arranged
that the water overflowing from the top trap runs down this pipe or passage into
the bottom trap to seal the same in the event of the water being sucked out of
the bottom trap, substantially as described.
2. A double seal drain trap consisting essentially of two traps or water seals
one below the other connected together by an upright pipe or passage provided
with a float valve so arranged that when the water level in the bottom trap falls
the float valve closes the said pipe or passage and thus prevents the trapping water
from being sucked out, substantially as described.
3. The improved double seal drain trap constructed arranged and operating
substantially as hereinbefore described with reference to the accompanying
drawing.
Dated this 6th day of August 1897
CHARLES BOSWORTH KETLEY,
Agent for the Applicants.