Improvements in Traps for Gullies and the like.
Year: 1892

page_text: COMPLETE SPECIFICATION.
Improvements in Traps for Gullies and the like.
I, ISAAC THOMPSON of 12, Deansgate Great Grimsby in the County of
Yorkshire "Registered 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 :-
The object of my invention is to provide a simple and efficient trap, that will
not only effectually prevent the egress of sewer gas and the like, but also auto-
matically stop the outflow of water or sewage, should the sewer become flooded
from heavy rain, storms or any other cause.
For the carrying out of my invention I construct my gully or stink trap as
follows:-
The trap is made double, that is to say, with an upper and a lower chamber, said
two chambers being divided by a transverse partition through which passes a pipe
open at both its ends.
The two chambers I make preferably somewhat in the form of an hour glass but
open at top and bottom. The upper chamber is covered with a perforated plate or
grating carrying a bell, into which the upper end of the pipe projects thus forming
an ordinary bell trap.
The lower chamber is closed by a detachable cup shaped extension enclosing a
loose ball of suitable dimensions and material. The outlet pipe may be connected,
in any convenient position to the lower chamber, but preferably near the top of
same.
That my invention may be the better understood I have hereunto annexed a
sheet of drawings in which :-
Figure 1. is an elevation; and,
Figure 2. a vertical section of my invention.
Similar letters of reference indicate corresponding parts in both the figures.
a is the upper; and 6 the lower chamber of the trap; said two chambers being
divided by the transverse partition c, through which passes the pipe d.
The chamber a is covered by the perforated plate or grating e, carrying the
bell f.
To the lower chamber is attached the cup or extension g. (preferably of glass)
by means of the screw-threaded washer or ring nut h; this method of securing the
extension g is, however, given only as an example as I may employ other methods
if found more convenient, in accordance with the materials employed in the
manufacture.
In the aforesaid extension g, is the loose ball i which I make either hollow or solid,
preferably of india-rubber or other like material, and of such specific gravity, that it
will float in the water and thus close the end of the pipe d, as shown unless water
is flowing from the upper chamber. k. is the outlet pipe for connecting to the drain
or sewer.
The action of my trap is as follows:-
The surface or waste water, flowing into the trap, passes down the pipe d. into the
chamber b, displacing the ball i by its downward pressure, and from the chamber 6 by
way of the outlet k. it discharges into the drain or sewer.
The water retained in the chambers a. and b, forms a double trap for the
exclusion of any sewer gas that might enter the chamber 6 through the outlet k,
(as clearly seen by reference to Figure 2) while at the same time, the ball i effectually
prevents the upward flow of any water entering the chamber 6 during a flood, the
additional pressure only tending to more securely close the pipe d, by forcing the
ball more firmly against its lower end.

page_text: I construct my traps of any suitable metal or of stoneware, the detachable
portion g. being preferably of stout glass, for convenience of cleaning and
inspection.
My traps may be constructed in any required dimensions.
I wish it understood that I do not confine myself to the materials herein specified,
nor to the precise form of trap shown in the drawing; as I may modify their
construction in accordance with requirements without in any way departing from
the nature of my invention.
My gully traps may be fixed in any convenient manner, in the example shown,
the trap is supported by its flange m on the stone slab n n, which is suitably recessed
to receive it.
Having now particularly described and ascertained the nature of my said
invention I declare that what I claim is :-
In gully and like traps, the combination of a bell trap and a ball valve,
substantially in the manner herein set forth and illustrated and for the purposes
specified.
Dated this 7th day of December 1892
GRAHAM BENNIE & Co.,
Agents for Applicant.