Improvements in Grease Traps.
Year: 1891

page_text: Date of Application, 2nd Mar., 1891
Complete Specification Left, 1st Dec., 1891-Accepted, 2nd Jan., 1892
PROVISIONAL SPECIFICATION.
Improvements in Grease Traps.
I SAMUEL STEVENS HELLYER of 21 Newcastle Street Strand in the County
of Middlesex Engineer do hereby declare the nature of this invention to be as
follows:-
:-
My invention has for its object to provide a grease trap which can be caused to
act very efficiently in preserving the pipes leading therefrom from greasy deposit
and which will be flushed out at intervals in a manner such as to preserve the trap
itself in a practically clean condition. According to my invention to avoid corners
for deposit and to facilitate flushing I make the body of the trap preferably of a
curved form and somewhat conical and with a curved rounded bottom part from
the lower portion of which the outlet pipe to the drain proceeds it being turned
up so as to constitute a water seal. At the upper part of the outlet pipe so turned
up may be a pipe or riser for ventilation and access. The inlet or inlets to the
trap for dirty or greasy water from the sinks or other places open also preferably
at the lower part of the body of the trap and below the water level therein. I
make them preferably at right and left of the outlet and I preferably make the
said iulets of a short tubular socket for the attachment of the pipes leading from
the sink or other place there being if desired for the said attachment a connecting
piece with a socket at the side for the reception of the pipe from the sink or other
place so that by adjusting this connecting piece round in its socket the socket at
the side can be brought into the position most convenient for the connection of the
pipe from the sink or other place irrespective of the position of the grease trap.
The connecting piece may also be provided with an open topped pipe or riser for
ventilation and access. I provide also means whereby flushing at intervals is
effected both from the upper and lower parts of the interior of the trap. For this
purpose a pipe from any suitable automatic flushing cistern or equivalent device is
connected to the trap so as to communicate with passages therein one leading down
and opening at the bottom of the trap. It should open opposite to the outlet
therefrom and the other leading into an annular passage around the top of the trap
from which annular passage the flushing water passes into the trap and down its
sides by an annular slit or series of openings. The upper supply of flushing water
also passes into a nozzle or nozzles opening at the upper part of the trap preferably
at the side opposite the outlet from the trap the purpose of which supply of water
from the said nozzle or nozzles is to break up solidified grease on the top of the
water in the trap and together with the supply of water at the bottom of the trap
to flush out there from the grease, or part of the grease, so broken up and also any
matter which may deposit at the bottom of the trap.
The body of the trap is closed by a cover which fits round the top of the trap
the fitting being preferably somewhat conical & fitting closely so as to avoid
spaces for the accumulation of deposit.
Dated this 2nd day of March 1801
J. H. JOHNSON & Co.,
47, Lincoln's Inn Fields, London, Agents.

page_text: COMPLETE SPECIFICATION.
Improvements in Grease Traps.
I, SAMUEL STEVENS HELLYER of 21 Newcastle Street Strand in the County
of Middlesex 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 has for its object to provide a grease trap which can be caused to
act very efficiently in preserving the pipes leading therefrom from greasy deposit
and which will be flushed out at intervals in a manner such as to preserve the trap
itself in a practically clean condition without the necessity for cleaning by hand.
I will describe my invention with reference to the accompanying drawings
Figures 1 and 2 of which are sections at right angles to each other of a grease
trap constructed according to my invention and Figure 3 is a plan of the same with
the cover removed.
To avoid corners for deposit and to facilitate flushing I make the body A of the
trap of a curved form preferably somewhat conical and with a curved or rounded
lower portion from which the outlet pipe B to the drain proceeds, which outlet pipe
is turned up as shewn at B2 so as to constitute a water seal, and, may be provided
at the upper part as shown with a branch or upcast C to give access to the interior
of the trap and drain, and which upcast may be closed when required by a close
fitting valve or cover C¹. If it be required to ventilate the outgoing drain the
stopper C¹ can be dispensed with, and an upcast pipe be fixed in the branch and
carried to a suitable height or distance. D D are inlets to the trap for dirty or
greasy water from the sinks or other places. These inlets preferably open into the
lower part of the body of the trap below the water level therein. In the drawing I
have shewn two inlets arranged one on each side of the outlet B, and having each a
short tubular socket D¹ but I may use one inlet or more than one as desired leading
into the trap in any suitable position, and one sink or two or more may lead into
each inlet. The connections of the pipes and branches from the sink or sinks to the
trap may be effected in any convenient way; for example a pipe D2 from the sink or
the like may be directly attached to the socket D₁ as shewn on the left hand side of
Figure 2 or a connecting piece E may be fitted in the socket D¹ as shown on the
right hand side of Figure 2, the said connecting piece E having a socket or sockets E!
for the reception of the pipe or pipes as at D' from the sink or sinks or other
place or places so that by adjusting this connecting piece E in the socket D', the
socket or sockets can be brought into the position most convenient for the con-
nection of the pipe or pipes from the sink or sinks or other place or places
irrespective of the position of the grease trap. The connecting piece E is preferably
provided with an opening F fitted with a removable grating for ventilation and
access. For the purpose of flushing the trap at intervals a pipe from any suitable
supply of water (such as an automatic flushing cistern or a bath or from a source
of rain water supply) is connected at G to the trap, so as to communicate with
passages G1 and G2 therein the passage G¹ (or two or more such passages) leading
down to and opening at the bottom of the trap opposite to the outlet B therefrom
and the other passage Gleading into a rim or annular passage H around the top
of the trap from which annular passage the flushing water passes through slots or
openings into the trap and down its sides. Flushing water also passes into the
upper part of the trap through a nozzle or nozzles 1 opening preferably at the back
of the trap opposite the outlet B, the flush of water from the said nozzle or nozzles
being for the purpose of breaking up solidified grease that may be on the top of the
water in the trap and together with the supply of water through the passage (or
passages) G at the bottom of the trap flushing out therefrom grease so broken up
and also deposited matter which may be at the bottom of the trap.
The body A of the trap is closed by a cover K which fits round the top of the

page_text: trap the fitting at K¹ being preferably somewhat conical and close as shewn so as
to avoid spaces for the accumulation of deposit.
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 grease trap having an upturned outlet from the bottom of the trap and
an inlet or inlets for dirty or greasy water, the combination of a flushing rim (H, h)
or a nozzle or nozzles (I) at the upper part of the trap or both the said flushing
rim and the said nozzle or nozzles, and a passage or passages such as G' all
substantially as and for the purposes hereinbefore described.
2. In a grease trap having an upturned outlet from the bottom of the trap and
an inlet or inlets for dirty or greasy water, the combination of a passage or passages
such as G¹ for admitting flushing water to the bottom of the trap, and means for
admitting flushing water to the upper part of the trap all substantially as and for
the purposes hereinbefore described.
3. The construction, combination and arrangement of parts constituting an
improved grease trap as herein before described and illustrated by the accompanying
drawings.
Dated this 30th day of Nam 1901
J. H. JOHNSON & Co.,
47, Lincoln's Inn Fields, London, W.C., Agents.