An Improved Trap for Waste Water Outlets.
Year: 1886

page_text: Date of Application, 7th Oct., 1886.
Complete Left, 7th July, 1887.
Complete Accepted, 9th Aug., 1887
PROVISIONAL SPECIFICATION.
An Improved Trap for Waste Water Outlets.
I WILLIAM RANDALL HARRIS of No. 5 Sussex Street, Lower Broughton, Manchester,
in the County of Lancaster, Machinist, do hereby declare the nature of this invention
to be as follows:-
:-
My invention relates principally to the waste pipes employed in dwelling houses to
effect the discharge of water from sinks and baths and otherwise to convey away waste
water. In order to prevent the influx of sewer gases through such pipes into the
interiors of dwellings and buildings it is usual to arrange for the outlet ends of such
pipes to discharge above a grid so that there is no direct connection with the sewer
but in consequence of the usual inflow of air through such pipes gases arising from
the grids or sewers or generated outside the buildings pass into the pipes and by that
means have access to the interiors of the buildings. To prevent this is the object of
my invention. I construct a hinged flap valve in such a manner as that it can be
readily clamped in position upon the pipe end. The end of the pipe is cut away at
an angle so as to form a sloping mouth which is by preference shaped into a
rectangular form. The valve fits against the said mouth and tends by its weight to
close the outlet but yields to a pressure of water within the pipe and opens to permit
the outflow of such water. The fulcrum of the valve is formed upon a clip piece
which encircles or partly encircles the pipe and can be tightened by means of a bolt
or screw so as to be clamped in position. The said clip is provided with a fixed or
removable joint pin upon which the stem of the valve is mounted. In some cases I
make the said stem in the form of a hook so that it can be readily removed and
replaced when it is desirable to clear the outlet. I prefer to form the valve with a
guide piece which enters the mouth of the outlet. I may form the piece upon which
the valve is mounted with a mouth suitably shaped for the valve to fit it closely. If
preferred the said clip piece or mouth piece may be adapted to be soldered to the
pipe end.
1000
DUTTON & FULTON,
1, St. James Square, Manchester,
Agents.

page_text: I WILLIAM RANDALL HARRIS of No. 5 Sussex Street, Lower Broughton, Manchester,
in the County of Lancaster, Machinist, 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 and accompanying drawings
:-
My Invention relates principally to the waste pipes employed in dwelling houses to
effect the discharge of water from sinks and baths and otherwise to convey away
waste water. In order to prevent the influx of sewer gases through such pipes into
the interiors of dwellings and buildings it is usual to arrange for the outlet ends of
such pipes to discharge above a grid or into an enlargement or basin so that there is
no direct connection with the sewer but in consequence of the usual inflow of air
through such pipes, gases arising from the grids or sewers or generated outside the
buildings pass into the pipes and by that means have access to the interiors of the
buildings. To prevent this is the object of my invention. I construct a hinged flap
valve in such a manner as that it can be readily clamped in position upon the pipe
end. The valve tends by its weight to close the outlet against the ingress of air or
gas but yields to a pressure of water within the pipe and opens to permit the outflow
of such water.
And in order that my said invention may be properly understood I will now
proceed more particularly to describe the same with reference to the annexed sheet of
drawings.
Fig. 1 is a vertical section of my improved waste water outlet valve and Fig. 2 is a
plan view of the same. The case containing the flap valve a is made in two
parts b and c.
The part bis rectangular at the lower end and at the upper end is
of a semicircular form with lugs 61 which project on either side. The other part c is
also semi-circular in shape and has corresponding lugs c¹ so that when the two
halves b and c are put together so as to embrace the end of the waste pipe d and are
fastened together by means of serows or bolts e passing through the lugs b, c the
flap valve case is firmly secured in position. The flap a is formed with trunnions a¹
at its upper end and these trunnions enter recesses made to receive them in the part c.
When the halves are put together or are clipped on the end of the waste pipe d as
described and as shown in the drawings the trunnions are inserted into the recesses
in the part c and as the front of each recess is closed by putting the halves b and c
together the valve a is securely pivotted in the bearings thus formed. The valve a
fits loosely against the side walls of the part 6 and falls by its own weight into the
position shown at Fig. 1. In this position no draughts of air or admission of sewer
gas or of vermin to the waste pipe d can take place but when there is a rush of waste
water down the pipe the flap a is lifted and allows the water to escape closing as soon
as the rush is past. If thought desirable the hereinbefore described valve might be
sealed and made additionally secure by allowing the outlet to dip into water. It will
be evident that instead of making the case in two parts as described and clipping

page_text: them on the waste pipe, it might be made in one piece and the flap valve a mounted
on an inserted pin or pivot. The case could be secured to the waste pipe by a set
screw or by soldering or by other suitable means.
Having now particularly described and ascertained the nature of the said Invention
and in what manner the same is to be performed I declare that what I claim is :-
(1) The improved trap for application to the outlets of waste water pipes sub-
stantially as hereinbefore described and shown.
(2) In traps for application to waste water pipes the flap valve a closing auto-
matically by its own weight to prevent the ingress of air, sewer gas and verinin but
capable of being lifted by the outflow of waste water so as to permit the escape of
the same, substantially as described and shown.
(3) In traps for application to waste water pipes the combination of the valve a
with a case capable of being clipped or secured upon or to the waste water pipe
substantially as hereinbefore described and shown.
The ch JT.... 1007
DUTTON & FULTON,
1, St. James Square, Manchester,
Agents.