Improvements in Grease Traps.
Year: 1893

page_text: Date of Application, 7th Mar., 1893
Complete Specification Left, 21st Apr., 1893-Accepted, 27th May, 1893
PROVISIONAL SPECIFICATION.
Improvements in Grease Traps.
1, FRANCIS LE ROSSIGNOL of 1 Gresham Buildings Basinghall Street E.C.
Architect and Surveyor do hereby declare the nature of this invention to be as
follows:-
:-
My invention has for its object to provide a self-cleansing grease trap, but which
may also be used for receiving the discharge from rainwater pipes, bath or lavatory
wastes and is fully explained by the description and drawings hereunto annexed.
DESCRIPTION OF DRAWINGS.
Figs. 1. 2. 3. are severally the plan, longitudinal section, and cross section of trap
constructed in accordance with my invention.
Fig. 1 is a plan of the trap with the principal inlet at A and the outgo at B. It
can be made with one or two side inlets like that at C. The opening at D is for
access to the trap, it forms an air disconnection from drain and is covered with a
removeable iron grating, fitting on the ledge E.
Fig. 2 is a longitudinal section taken through centre of trap showing the inlet A
for connection with discharge pipe from scullery sink. The angle at which this
inlet is constructed causes the water to rush over the lip F (where it has a fall of
three inches to level of water in trap) with such an impetus that it ensures the
effectual cleansing out of the trap, also breaking up the fat (if any) floating on the
top of the water and carrying it into drain. Additional flushing through the same
inlet may be obtained from the hot-water tap which in most houses is to be found
over the sink. The curves G, G, G of back, bottom, and overflow of trap are as
easy as possible an! the trapping lip H being at the same angle as the inlet A. offers
the minimum of resistance to the scouring out of the trap.
The quantity of liquid retained in the trap is reduced by the shape to about half-
a-gallon. At the base shown is constructed so as to facilitate the fixing of the
trap. At C is represented one of the optional side inlets for bath or rainwater
pipes, which can be closed with a stoneware plug if not required. At D is the
sectional view of opening and at J a similar view of grating referred to under
Fig. 1.
Fig. 3 is a cross section of trap and shows egg-shape of invert of same, with view
of principal inlet at A and optional side inlet at C, also sectional view of opening
at D and grating at J.
March 7th 1893.
FRANCIS LE ROSSIGNOL.
COMPLETE SPECIFICATION.
Improvements in Grease Traps.
I, FRANCIS LE ROSSIGNOL, Fellow of the Surveyors Institution, Member of the
Sanitary Institute, of Gresham Buildings, Basinghall Street E.C. Architect &
Surveyor 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 self cleansing grease trap, but
which may also be used for receiving the discharge from rainwater pipes, bath or
lavatory wastes and is fully explained by the description and drawings hereunto
annexed.

page_text: In order that my said invention may be fully understood and readily carried into
effect I will proceed to describe the drawings.
DESCRIPTION OF DRAWINGS.
Figs. 1. 2. 3. are severally the plan, longitudinal section, and cross section of trap
constructed in accordance with my invention.
The alteration shown in Figs. 1, 2 & 3 of Complete Specification from Figures 1, 2,
& 3, of Provisional Specification consists of a reduction in the length of the body,
and increased tapering of sides of trap, and the side inlets are reduced to mere
sockets for connection with lavatory or bath wastes.
Figure 1 is a plan of the trap with the principal inlet at A and the outgo at B. It
can be made with one or two side inlets like that at.C. The opening at D is for
access to the trap; it forms an air disconnection from drain, and is covered with a
removeable iron grating, fitting on the ledge E.
Figure 2 is a longitudinal section taken through centre of trap showing the
inlet A for connection with discharge pipe from scullery sink. The angle at which
this inlet is constructed causes the water to rush over the lip F (where it has a fall
of 3 inches to level of water in trap) with such an impetus that it ensures the effectual
cleansing out of the trap, also breaking up the fat, if any, floating on the top of the
water and carrying it into drain. Additional flushing through the same inlet may
be obtained from the hot water tap which in most houses is to be found over the
sink. The curves G, G, G, of back, bottom, and overflow of trap are as easy as
possible and the trapping lip H being at the same angle as the inlet A offers the
minimum of resistance to the scouring out of the trap.
The quantity of liquid retained in the trap is reduced by the shape to about half-
a-gallon. At I the base shown is constructed so as to facilitate the fixing of the
trap. At C is represented one of the optional side inlets for bath or rainwater
pipes, which can be closed with a stoneware plug if not required. At D is a
sectional view of opening and at J a similar view of grating referred to under
Figure 1.
Fig. 3 is a cross-section of trap and shows egg-shape of invert of same with view
of principal inlet at A and optional side inlet at C, also sectional view of opening
at D and grating at J.
This trap should not be used as a yard gulley for surface water and should
preferably be fixed half-an-inch above the ground level to prevent the entrance of
gravel or grit which might impede the scouring out of the grease.
Having now particularly described and ascertained the nature of said inven-
tion and in what manner the same is to be carried out I declare that what I
claim is :-
1. In a grease trap having an upturned overflow from invert of trap and an inlet
or inlets for dirty or greasy water, the tapered shape of trap.
2. In a grease trap having an upturned overflow from invert of trap and an inlet
or inlets for dirty or greasy water, angle of trapping lip being at the same angle as
inlet.
3. The construction, combination and arrangement of parts, constituting an
improved and self-cleansing grease-trap as herein before described and illustrated by
the accompanying drawings.
Dated this 1st dow of Ail 1802
F. LE ROSSIGNOL.