Year: 1897

page_text: I, DAVID WADDELL BUCHAN, of 36 Renfrew Street, in the City of Glasgow,
Sanitary Engineer, do hereby declare the nature if this Invention to be as
follows:-
This Invention relates to drain traps and it has for its object to improve the
construction of these so as to permit of easy access for cleaning purposes and also
to render the traps adaptable to the requirements of any system of drainage.
To that end, under one modification and in order to provide a trap which shall
permit of easy access for cleaning purposes, I construct the upper or inspection
end of the trap of elongated oval form having a flat lid which fits into the oval
socket, the inspection mouth or socket sloping inwards and downwards from the
sewer side towards the bend of the trap. Between the trap proper and the sloping
side of the inspection mouth I connect a branch pipe thus establishing communica-
tion between the sewer end of the trap and the inspection mouth, this branch pipe
being normally closed by a sealed cover fitting in a socket formed in the sloping
side of the inspection mouth. This construction of trap, because of its wide oval
mouth, admits of better access to the house and sewer sides of the trap than has
been hitherto possible. The trap may be ventilated on the drain and sewer sides
in the usual way. Instead of a flat cover, a cover with a downwardly projecting
lip may be substituted and fitted into an annular ring formed on the mouth of the
trap, the cover being of grid form. This form of cover is preferably used when
it is desired to ventilate the manhole, which result is obtained by forming a passage
in the side of the manhole which communicates with a vertical fresh air passage
taken from the street, this vertical passage being provided with a removable dirt
receptacle.
In a modification of the above, the cleaning hole on the sewer side of the drain,
instead of being taken through the sloping side of the inspection mouth, may be
formed as a separate branch outside of this mouth and that portion of the trap
above the bend and which is on the house side may or may not be made separate
from the trap proper, and fit into a socket formed on the trap above the bend.
When made in two portions the trap is readily adaptable to any system of drainage
in which the run of the sewer doubles upon the run of the drain pipes, or is at
any angle thereto. In the case of a channel drain trap the construction is the
same as that first described the branch pipe forming the cleaning hole on the
sewer side of the trap being connected to the sloping side of the inspection mouth.
The channel on the house side of the drain may also be made in two portions.

page_text: As a further modification the inspection end of the trap, instead of having one
long mouth, may be provided with two circular shaped mouths, one being con-
nected to either side of the trap bend, and the trap may or may not be made in
two portions to enable the one portion to be placed in any relation to the other.
These latter traps may be ventilated on the house and sewer side of the trap by a
ventilating pipes in such manner that the entering air may not play directly upon
the water, thus minimizing the risk of freezing the water seal.
100%
WALLACE FAIRWEATHER.
Of the Firm of Cruikshank & Fairweather,
Chartered Patent Agents, 62 St. Vincent Street, Glasgow,
Agent for the Applicant
I, DAVID WADDELL BUCHAN, of 36 Renfrew Street, in the City of Glasgow,
Sanitary 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:―
This Invention relates to drain traps and it has for its object to improve the
construction of these so as to permit of easy access for cleaning purposes and also
to render the traps more adaptable to the requirements of any system of drainage
and manholes.
The Invention is illustrated by the accompanying drawings, Figure 1 being a
vertical section of a drain trap, Figure 2 a plan with the cover removed and
Figure 3 a plan with the cover in position. Figure 4 is a vertical section of a
slightly modified form of drain trap.
In order to provide a trap which shall permit of easy access for cleaning pur-
'poses, I construct the upper or inspection end A¹ of the trap A of elongated oval
form having a flat lid B which fits into the oval socket C, the inspection mouth
or socket sloping inwards and downwards from the sewer side A2 towards the
bend A3 of the trap A. Between the trap proper and the sloping side of the
inspection mouth A₁ I connect a branch pipe D thus establishing communication
between the sewer end A2 of the trap A and the inspection mouth A¹, this branch
pipe being normally closed by a sealed cover D¹ fitting in a socket E formed in
the sloping side of the inspection mouth A'. This construction of trap, because
of its wide oval mouth A¹, admits of better access to the house and sewer sides of
the trap than has been hitherto possible.
The lid B which may be either a grating or plate, according to circumstances,
and fits into the socket C, may if considered necessary be provided as shewn at
Figure 1 with a projecting lip C¹ which rests upon the lower end of the sloping
side of the inspection mouth in order to prevent the deposit of soil on the cover D¹;
or the trap may have a vertically projecting lip formed at the lower end of its
sloping side as shewn at Figure 4 for the same purpose. The trap may be venti-
lated on the drain or house side in the usual way, either by having a perforated
lid B or close lid and side air inlet Fas shewn at Figure I.
Having now particularly described and ascertained the nature of my said In-
vention and in what manner the same is to be performed, I declare that what I
claim is:-

page_text: The improved drain trap constructed substantially as described with reference
to the drawings annexed and for the purpose set forth.
WALLACE FAIRWEATHER.
Of the Firm of Cruikshank & Fairweather,
Chartered Patent Agents, 62 St. Vincent Street, Glasgow,
Agent for the Applicant