Improvements in Drain Traps.
Year: 1891

page_text: COMPLETE SPECIFICATION.
Improvements in Drain Traps.
I, JEAN CABUY, of 38, Rue Maes, Brussels, in the Kingdom of Belgium,
Engineer, 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 :-
My invention relates to improvements in drain traps whereby they are auto-
matically freed from accumulations of sediment, the escape of sewer and other
gases is prevented and also the backward flow of sewage water after a heavy fall
of rain. By my improvements I am also enabled to dispense with the overflow
outlet or syphon which has hitherto usually formed a portion of a drain trap.
In carrying out my invention I apply to the lower part of a drain trap a counter-
weighted pivotted or hinged bottom or flap in such a manner that immediately the
fecal or other matters which rest upon the said bottom or flap attain a given weight,
they cause the bottom or flap to swing downwards, and are thereby discharged into
the drain, the movable bottom or flap immediately closing under the action of its
counterweight without allowing time for gases to pass.out from the trap.
Another advantage of my invention is that the same apparatus can be used
either as a trap or as the mouth of a drain open to the air. For this latter
purpose it is only necessary to disconnect the movable bottom or flap as hereinafter
described.
In order to enable my invention to be fully understood I will describe how it can
be carried into practice by reference to the accompanying drawing, in which
Figure 1 is a vertical section of part of a drain having a trap provided with my
improvements, its top being placed on a level with the pavement, and the grating
through which the water and matters enter the trap being placed in a line with the
side of the curb, so as to be out of sight of persons on the pavement.
Figure 2 is a similar view but shewing the grating level with the road, this
arrangement being preferable in sloping streets as it allows a more direct and rapid
flow into the drain.
Similar letters in both the figures indicate similar parts.
A is the body of the trap; a, b is the top portion which in Figure I is shewn
placed on a level with the pavement while in Figure 2 it is shewn placed on a level
with the road; c is the grating serving to intercept the passage of any hard
substances. D is the bottom or flap adapted to swing on a hinge d; E is the
counterweight the position of which, as shown in the drawing, can be altered to
adjust it according to the weight that it is intended the movable bottom or flap D
shall sustain. F is the air shaft.
If it be required to convert the apparatus into a mouth for a drain open to the
air it is only necessary to remove the bottom or flap by unscrewing the nut e.
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 and use of a drain trap having a hinged or pivotted counter-
weighted bottom or flap arranged and operating substantially as, and for the
nurnose herein before described.

page_text: 2. The manufacture and use of the improved drain traps hereinbefore described
and illustrated in the accompanying drawing.
Dated the 29th day of August 1891.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.