FOLDING GAS OR TIDE FLAPS FOR PREVENTING THE PASSAGE OF GASES FROM MAIN SEWERS INTO LATERAL SEWERS
Year: 1880

page_text: LETTERS PATENT to Edward Willard and William Morley, both of Bermondsey,
in the County of Surrey, for an Invention of "FOLDING GAS OR TIDE FLAPS
FOR PREVENTING THE PASSAGE OF GASES FROM MAIN SEWERS INTO LATERAL
SEWERS."
PROVISIONAL SPECIFICATION left by the said Edward Willard and William
Morley at the Office of the Commissioners of Patents on the 28th August
1880.
EDWARD WILLARD and WILLIAM MORLEY, both of Bermondsey, in the County
of Surrey.
"FOLDING GAS OR TIDE FLAPS FOR PREVENTING THE PASSAGE OF
GASES FROM MAIN SEWERS INTO LATERAL SEWERS."
The Invention relates to flaps or valves constructed to prevent the passage of
gases from main sewers into lateral sewers, but allowing a constant flow of water
from the Interal sewer into the main sewer, and closing by a sudden rise in the
main sewer.
For this purpose we make the flap in parallel sections joined together in such a
manner that the lowest section or flap can turn on the adjoining flap, the latter
on the third, and so on, the uppermost section being attached to the valve seat
preferably by hinges.
We prefer to make the joints of the flaps horizontal, and to connect the flaps
by open hinges placed at the back of the latter, and allowing the lower flap or
series of flaps being lifted out, one or more flaps being also provided with a ring
or book for lifting it by hand.
When the valve is closed the flaps rest on the face of the valve seat (the seat
being preferably made of cast iron and faced with brass). The flaps may be made
of iron, zinc, brass, or other suitable material, and every flap except the lowest one
is provided with a ledge made flush with the face of the valve seat, and projecting
under the adjoining flap so as to form part of the seat of the latter.
If the downward flow in the sewer is small the lowest flap only will be turned up,
if the quantity of liquid becomes greater the two lowest flaps will open, and so on;
but as the flaps can only open towards one side a sudden back current will close
the flaps on their seat.
The valve seat or frame may be made of any shape and size required to fit
existing sewers, or may be designed for new sewers, and it may be made of any
suitable material.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Edward Willard and William Morley in the Great Seal Patent
Office on the 28th February 1881.
EDWARD WILLARD and WILLIAM MORLEY, both of Bermondsey, in the County
of Surrey. "FOLDING GAS OR TIDE FLAPS FOR PREVENTING THE PASSAGE OF
GASES FROM MAIN SEWERS INTO LATERAL SEWERS."
The Invention relates to flaps or valves constructed to prevent the passage of
gases from main sewers into lateral sewers, but allowing a constant flow of water
from the lateral sewer into the main sewer, and closing by a sudden rise in the
main sewer. For this purpose we make the flap in parallel sections joined together
in such a manner that the lowest section or flap can turn on the adjoining flap, the
latter on the third, and so on, the uppermost section being attached to the valve
seat preferably by hinges. We prefer to make the joints of the flaps horizontal,
and to connect the flaps by opon hinges placed at the back of the latter, and
allowing the lower flap or series of flaps being lifted out, one or more flaps being
also provided with a ring or hook for lifting it by hand. When the valve is closed
the flaps rest on the face of the valve seat (the seat being preferably made of cast
iron and faced with brass). The flaps may be made of iron, zinc, brass, or other
suitable material, and every flap except the lowest one is provided with a ledge
made flush with the face of the valve seat, and projecting under the adjoining flap
so as to form part of the seat of the latter. If the downward flow in the sewer
is small the lowest flap only will be turned up, if the quantity of liquid becomes
greater the two lowest flaps will open, and so on; but as the flaps can only open
towards one side a sudden back current will close the flaps on their seat. The
valve seat or frame may be made of any shape and size required to fit existing
sewers, or may be designed for new sewers, and it may be made of any suitable
material.
In the accompanying Drawing Fig. 1 represents a front elevation, and Fig. 2, a
vertical section of a sewer flap and seat embodying our Invention. A is the seat;
B, B, are the sections of the valve or flap, C, C, C, the hinges, the two lowest
sections being open while the upper sections remain closed. Each section except
the lowest one is provided with a ledge or plate D, which forms a seat for the
upper edge of the adjoining (lower) section. It is evident that the details of
construction may be altered without departure from the nature of our Invention.
What we claim is,―
1. A sewer flap or valve composed of parallel sections connected with each other
in such a manner that the lowest section can be turned on the second, the second
on the third, the third on the fourth, &c., by the pressure of the water or liquid
acting on the flaps, substantially as described.
2. In a sewer flap or valve, the combination of movable sections B, hinges C,
and plates D, substantially as and for the purpose described.
In witness whereof, we, the said Edward Willard and William Morley, have
hereunto set our hands and seals, this Twenty-sixth day of February,
EDWARD WILLARD. (L.S.)
WILLIAM MORLEY. (LS)