Improvements in Sink Traps.
Year: 1893

page_text: COMPLETE SPECIFICATION.
Improvements in Sink Traps.
I, SAMUEL CHRISTOPHER PERKINS, of 90 Augusta Street, in the City of Ottawa,
in the County of Carleton and Province of Ontario, in the Dominion of Canada,
Plumber, do hereby declare the nature of my invention for "IMPROVEMENTS IN
SINK TRAPS," 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 traps for intercepting sewer gases and grease.
The object of my invention is a trap from which sediment can be readily
removed.
Fig. 1 is an elevation of my improved trap.
Fig. 2 is a vertical section of the same, and
Fig. 3 is a similar section showing the cover removed and the strainer lifted out
for emptying the sediment.
A is the body of the trap, composed of a cylinder, provided with a rim a having
screw threads a¹ at the upper end, to receive a screw cover. B is the cover having
a threaded rim to fit the threaded rim a a¹ of the body and form a shoulder b¹
against the upper edge of the rim a, adapted to receive a packing ring; its hollow
contracted upward continuation 611 affords room for the strainer handle and finger-
hold for screwing and unscrewing. An elastic packing ring B₁ is introduced
between the shoulder b' and the edge of the body rim, to afford a tight joint. C is
the inlet waste pipe entering the body A. near the top at a". At one side of the
body is formed a vertical tubular excrescence D, communicating with the interior
of the body near the bottom by an opening a" and having the upper end formed
into an independent pipe D¹ and turned downward to form the connection with or
continuation of, the waste pipe, the throat or turning point d, which forms the
overflow, being kept a little below the inlet a". E is a basket formed of fine wire
webbing or perforated sheet, having an outwardly projecting rim e loosely fitting
the body A and suspended upon a small flange a secured to, or formed on, the
interior of the body a little below the inlet a". Said basket is provided with an
upward projecting handle E' for convenient handling and acts as strainer, all the
liquids entering by the inlet all and passing out at all having to pass through it,
the solid particles being retained therein, instead of being allowed to settle at the
bottom of the body A. To prevent syphoning a small perforation d' is provided
below the point d, connecting with the interior of the body A.
The trap may be made of any material, but I prefer lead with brass rims a and b
suitably turned and threaded.
The liquids passing through the waste pipe C enter the trap by the inlet a¹¹ and
pass through the strainer E to the bottom, out by the outlet al, rise in the tube D
and flow over the point d into the discharge pipe D', the body A and tube D being
kept filled to the level of the point d. When the sediment accumulates in the
strainer E, the latter is readily lifted out and emptied, the cover B being unscrewed
and removed for the purpose and then replaced.
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. In a sink trap, the combination of a closed vessel provided with an airtight
removable top, an inlet nozzle near the top, an outlet opening near the bottom, a
tubular excrescence communicating with the outlet and extending partly up the
side of said vessel to a point below the bottom of the inlet, a discharge nozzle at
the upper end of said tubular excrescence, a small vent hole in that part of the

page_text: side of said vessel which forms the partition between it and said excrescence and
near the top of the latter, an internal supporting rim or flange below the inlet
in said vessel and a strainer basket with rim adapted to sit upon said rim in the
vessel and provided with upwardly extending handle, substantially as set forth.
2. In a sink trap, the combination of a vessel A having its upper end tapped, a
threaded top B adapted to close said vessel airtight, an inlet nozzle C opening in
said vessel near the top by an opening a", a tubular excrescence D communicating
at its lower end with said vessel by an outlet opening a¹¹ near the bottom thereof
and extending up the side of the same to a point d a little below the inlet a", a
discharge nozzle D' communicating with the upper end of the tubular excrescence,
a vent d in that part of the side of the vessel which forms the partition between it
and the tubular excrescence, a rim or flange a on the interior of said vessel a
little below the inlet a", and a strainer basket E provided with a rim or flange e
adapted to rest upon the flange a' and with an upwardly extending handle E',
substantially as set forth.
Dated this 7th day of Anuil A n 1000
SAMUEL C. PERKINS,
Per A. Harvey,
His Attorney.