Improvements in or relating to Carburettors for Internal Combustion Engines
Year: 1899

page_text: Date of Application, 5th Aug., 1899-Accepted, 23rd Sept., 1899
COMPLETE SPECIFICATION,
Improvements in or relating to Carburettors for Internal Combustion
Engines,
A communication from (Mrs.) LÉON LONGUEMARE, of 12, Rue du Buisson St.
Louis, Paris, France.
I, ALFRED JULIUS BOULT, of 111, Hatton Garden, in the County of Middlesex,
Chartered Patent Agent, do hereby declare the nature of this invention and in
what manner the same is to be performed, to be particularly described and ascer-
tained in and by the following statement:-
The improved carburettor forming the subject of this invention, is, speaking
generally, applicable to motors worked by the ignition and explosion of a
mixture of any suitable liquid hydrocarbon, mineral essence, petroleum or the
like, with air.
The device is represented by way of example in the accompanying drawing,
in which
Figure 1 shows the whole apparatus in vertical section:
Figure 2 is a partial sectional horizontal plan, on the line A B of Figure 1
showing especially the seat of the valve for regulating the admission of air:
Figure 3 is a detail view showing the said air-feed regulating valve in plan:
Figures 4 and 5 show in elevation and inverted plan respectively the mechanism
for the distribution of the liquid hydrocarbon, petroleum or essence.
The apparatus works with a constant level of liquid hydrocarbon which latter
is admitted through a conduit a with a regulating needle valve b, to the reser-
voir c. On the vertical spindle e of said valve is mounted guided and operates,
a float d.
When the normal level of hydrocarbon in the reservoir c falls, the float d will
bear upon ears or projections f formed at the outer ends of levers g. pivotally
mounted at the bottom of the reservoir c the inner ends of which levers are so
combined with a plate or part h on the spindle e of the needle valve b, as to lift
the said spindle and consequently its valve b to the extent to which the level
has fallen, whereas, when the level is maintained at its normal height, the float d
releases the levers 9 which then allow the spindle e and its valve b to re-descend
to the position in which the valve cuts off the supply of liquid hydrocarbon.
To the reservoir c is connected the body of the carburettor proper by a con-
duit i admitting the hydrocarbon below the distributing or feed nozzle j which
is formed of a truncated conical part adjusted upon a seat provided for this
purpose and furnished with grooves m sufficiently large to allow the hydrocarbon
to pass under the effect of the suction of the motor.
The nozzle or valve j is fixed to or formed on a stem which is screwed into
5 the bottom part of a bearing or tubular part n. and which comprises below the
said nozzle a chamber o for the admission of the hydrocarbon, the upper level
of which corresponds to the normal level which the hydrocarbon should occupy
in the apparatus, and consequently in the feeding reservoir c the said chamber

page_text: communicates by conduits arranged concentrically around the socket q for
the stem with an under chamber r communicating with the inlet conduit i
the lower part of the chamber r being closed by a screw stopper and serves
for the discharge or emptying of the apparatus.
The tubular bearing n of the nozzle is surrounded by an annular chamber a
communicating with a conduit t for the admission of air, and which air passing
along in the direction indicated by the arrows is directed so as to pass upwards
around the said nozzle j by an annular sleeve or guide u surrounding the
bearing n at suitable height and distance it being supported, upon an annular
horizontal partition formed-in the body of the apparatus at the height of the
upper wall or portion of the air admission conduit t.
This partition v shown in Fig. 2 in detail has segmental openings or recesses
xyz so as to form passages placing the whole air chamber s in communication
with that part of the body of the apparatus which lies above the nozzle j; in
combination with the partition v, a valve of the kind represented in detail in
Fig. 3 is arranged and applied thereon; the said valve is circular, and is so cut
as to form sectors ryz¹, corresponding with the openings x y z of the partition v
and serving thus according to the relative position of these parts to regulate
the extent of their opening or closing relatively to the upper part of the apparatus,
according as a more or less large quantity of additional air is to be supplied.
The valve is provided with an upper curvature & in the form of three arms,
and a central socket e¹, by which it is attached to a vertical rod fl arranged in
the upper part of the apparatus, in the direction of the vertical axis of the
latter, which constitutes a chamber g', in which the explosion mixture is formed
and with which communicates a conduit h¹ for the admission of the said mixture
to the motor, the said mixture passing in the direction indicated by the arrows.
Within the cylindrical chamber g¹ is adjusted and operates in combination
with the conduit h', a valve k¹ with an opening ', so arranged as to correspond
with that of the conduit h¹, the section of which can thus by adjusting said
valve, be regulated, that is to say, be increased or diminished at will, for
regulating the speed of the motor; the valve moreover permits of completely
closing the conduit h¹ when the motor is to be stopped.
The valve is mounted on the rod or spindle ft of the valve c¹ by means
of its central socket which extends through the centre of the cover m¹ closing
the upper part of the chamber g¹; a spring n¹ is provided upon the spindle fi
in such a manner as to apply the valve c¹ against its seat v; a perforated plate o¹
assists in producing an intimate mixture of the hydrocarbon and the air admitted
below the latter, the said vapour and air being caused to traverse the perforated
plate together before entering the chamber g' and conduit h¹, through which
the explosive mixture passes to the motor.
The valves k¹ and c¹ are respectively controlled from the exterior of the apparatus
by the aid of small arms ¹¹ the arm p² being mounted on the spindle f¹ of
the valve c', and the arms q¹ being mounted on the socket of the valve ¹;
these arms connected by rods to operating handles arranged at any suitable points,
permit of the free and easy control of the valves c and ¹, thus ensuring the
proper proportions of air for forming the explosive mixture, and the suitable
conditions for the admission of the said mixture to the motor.
Having now particularly described and ascertained the nature of the said
invention, as communicated to me by my foreign correspondent, and in what
manner the same is to be performed, I declare that what I claim is:
:―
1. A carburettor operating with a constant level of carburetting fluid, com-
prising a supply nozzle for the introduction of the liquid hydrocarbon, petroleum,
- essence or the like to the mixing chamber, two valves, one applied to the air
chamber surrounding the supply nozzle and pressed to its seat by a spring, and
serving to effect the regulation of the air-supply to the hydrocarbon, the other
valve being arranged in the mixing chamber in order to control the size of

page_text: opening to the conduit for conveying the said mixture to the motor; the said
valves being mounted, one rigidly and the other loosely, upon one and the same
spindle, and being separated by a perforated plate to ensure an intimate mixture
between the hydrocarbon vapours and the air; and means for actuating said
valves from the exterior of the apparatus substantially as described.
2. In a carburettor a hydrocarbon supply nozzle as k, air supply guide, as u,
segmental valve and valve seat, as c,, perforated plate o', spindle f¹ and
tubular valve k¹, substantially as described.
3. The complete carburettor substantially as described or illustrated in the
accompanying drawings.
Dated this 5th day of August 1899.
BOULT & WADE,
Agents for the Applicant.