Improvements in Drain Traps.
Year: 1891

page_text: Date of Application, 19th Oct., 1891
Complete Specification Left, 4th July, 1892-Accepted, 13th Aug., 1892
PROVISIONAL SPECIFICATION.
Improvements in Drain Traps.
JAMES MCLACHLAN DOBSON Sanitary Inspector Springpark Springfield
Avenue Uddingston County of Lanark North Britain do hereby declare the nature
of this invention to be as follows:-
:-
The object of the improvements are
(1) The production of a better scour for the raising and washing out of the
suspended and solid matter.
(2) The lessening of the volume of water forming the seal of the trap as to
offer the least possible resistance to the action of the inflow of sewage giving the
Scour.
(3) The shortening and lightening of the trap that it may be more easily
handled and cost less in its application to existing drains.
Dated this 19th day of October 1891.
JAMES MCLACHLAN DOBSON.
COMPLETE SPECIFICATION.
Improvements in Drain Traps.
I, JAMES MCLACHLAN DOBSON, of Springpark, Springfield Avenue,
Uddingston, County of Lanark, North Britain, Sanitary Inspector, 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 the improvements are
(1) The production of a better scour for the raising and washing out of the
suspended and solid matter.
(2) The lessening of the volume of water forming the seal of the trap so as to
offer the least possible resistance to the action of the inflow of sewage giving the
scour.
(3) The shortening and lightening of the trap so that it may be more easily
handled and cost less in its application to existing drains.
And in order that my said invention may be properly understood, I have here-
unto appended an explanatory sheet of drawings, whereon
Fig. 1 is a side elevation of the improved trap as applied to house drains.
Fig. 2 is a longitudinal section of the trap.
Fig. 3 is a longitudinal section,
Fig. 4 a cross section on the line x-x Fig. 3, and,
Fig. 5 is a side elevation of a modified form of trap for drains.
Referring to the drawings, whereon the same reference letters, wherever repeated,
indicate similar or like parts :-
a is the inlet end of the drain trap. b is the outlet end. c is a branch for the
hand hole cover and for the ingress of fresh air. e is the tongue. g is a down-
wardly projecting cover piece, which covers over the mouth of the pipe d. fis
an opening in the cover g. This opening fis at or about the level of the water j
forming the seal. is an opening at the lower end of the cover g.
The pipe d leads from, or is in connection with, the sink or bath of the house or
other place, and the water, passing down said pipe d, issues in two jets or currents,
through the openings fundi, into the trap. The jet of water issuing through the
Pain Q17

page_text: opening, which, as aforesaid, is at or about the level of the water seal j, gives a
surface scour, as indicated by the arrow, so as to thoroughly wash away any floating
or suspended matter in the seal. The jet of water issuing through the opening i,
as indicated by the arrow, scours out the bottom of the trap, and thereby washes
away any solid matter. The combined action of the water jets gives the trap a
thorough wash out.
Instead of having one opening, there may be two or three openings, and also,
instead of having a single opening, there may be two or three such openings.
Figs. 3, 4 and 5, show a trap for ordinary drains, where a water flush from a sink
or bath is not available. To give the trap, in this case, also, a surface-current
scour and an under-current scour, it is made with a wedge-shaped projection h,
which stands up from the bottom of the trap. The sewage passes into the trap in
three streams, one stream 1, as indicated by the arrows, flowing over the top of the
wedge-shaped projection h, and giving the surface scour, so as to wash away floating
and suspended matter; whilst the other currents, see the arrows 2, flow down at
each side of the projection h, and scour out the bottom of the trap.
In order to lessen the volume of water forming the seal of the trap, and also to
shorten and thereby reduce the weight of the trap, the tongue e (see Figs. 2 and 3)
is made out of line with the branch e, instead of being made, as usual, in a line
with the right-hand side thereof. The tongue e, being out of line, as shown,
enables a trap which is usually 30 inches long to be reduced to say 22 inches,
without decreasing its efficiency. This reduction in the length of the trap, enables
it to be more easily handled, and to be reduced in price. The volume of water
forming the seal is also reduced.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, 1 declare that what I
claim is :-
1. The general arrangement and combination of parts of the improved drain
traps, substantially as hereinbefore described with reference to the drawings
annexed.
2. The combination with a drain trap, of a pipe connection (d) leading from a
bath, sink, or other place, for the purpose of giving a better scour, substantially as
hereinbefore described with reference to the drawings annexed.
3. In drain traps, the application and use, for the purpose of giving a better
scour, of a projection, h, substantially as hereinbefore described with reference to
Figs. 3 and 4 of the drawings annexed.
4. The combination with the pipe d, of the cover g with its jet orifices f and i,
for the purpose of giving a surface and under-current scour, substantially as herein-
before set forth with reference to the drawings annexed.
Dated this 2nd July 1892.
H. D. FITZPATRICK,
.70, Wellington Street, Glasgow, Agent