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

page_text: Date of Application, 23rd Dec., 1899-Accepted, 17th Feb., 1900
COMPLETE SPECIFICATION.
Improvements in or relating to Carburettors for Internal Combustion
Engines.
66
A communication from LA SOCIÉTÉ DES MOTEURS ET VOITURES AIGLE," of 1,
Square Labruyère, Paris, in the Republic of France.
I, ALFRED JULIUS BOULT, of 111, Hatton Garden, in the County of London,
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 present invention relates to carburettors for automatically regulating the
supply of air and liquid hydrocarbon, without regard to the level of the latter,
and consists in a novel arrangement of apparatus whereby the regulation and
division of the carburetting fluids mixed with air may be effected for feeding
motor cylinders. This carburettor can be employed in connection with an internal
combustion motor and particularly for those for use in automobile vehicles.
In order that this invention may be better understood, it will be described, by
way of example, with reference to the accompanying drawings in which:-
Figure 1 is a sectional elevation of a carburettor according to this invention, and
Figure 2 is an elevation of same;
Figure 3 showing a modification.
The carburettor comprises a vessel or casing A preferably cylindrical in shape,
closed at both ends by screwed caps or plates B, B and provided with three tubu-
lar passages I, L and J. Above the passage L in the interior of the casing A
is a partition a having a central hole in which a cylindrical part C is screwed, the
lower part of which is of greater diameter than the upper, and is provided with a
piston G the annular side wall of which has a convenient number of holes J- The
interior of the piston can be filled with a series of superposed discs of metallic
netting or perforated metal g² g².
The rode of the piston G is conical in its middle portion at E and is con-
stantly pressed upwards by a spring H. which tends to raise the piston in such
a manner that the conical part of the rod E is applied against the lower edge of
the central tubular passage b formed in one piece with or connected to the cap B.
This passage is in communication with the tube K through which the petroleum
or other liquid hydrocarbon is supplied, and is penetrated by the upper portion
of the rode which is provided with longitudinal grooves for the passage of the
liquid, and also with annular grooves or threads provided to prevent a too rapid
descent of the liquid. On the rod e is a cone F, the purpose of which will be
hereinafter explained.
The passage
J communicates with the motor cylinder and in the passage L is
arranged a valve, cock or other suitable device for closing more or less the section
of the passage.
In consequence of the suction produced by the motor piston, a partial_vacuum
is created below the piston G which causes the latter to descend, the cone E, which
acts as a valve, being withdrawn from its seat and allows the hydrocarbon liquid

page_text: to escape from the grooves in the rod e, and to run down the cone F in a very thin
sheet where it meets the air, heated or not, which arrives through the tubular
passage I. The two fluids become mixed since the oil becoming volatilized, and
if a few drops fall from the cone on the piston G or on the metallic discs g² g²,
the mixture, as it is drawn through the holes gg, meets them and volatilizes them
and conveys them in a gaseous state into the cylinder. During this time air is
still being drawn in through the tubular passage L and mixes with the fluid
passing out from the holes gg in the piston G to provide it with the quantity of
oxygen necessary for combustion. By varying according to requirements, the
section of the tubular passage L the quantity of air admitted can be increased or
decreased, and the richness of the mixture can thus be regulated, since the more
air admitted the less hydrocarbon will be used and vice versa.
The grooves and annular recesses on the rod e are provided to regulate exactly
the quantity of liquid hydrocarbon required for the working of the motor.
When the suction ceases, the piston G is raised by the spring H and the valve E
is applied against its seat, thus preventing any further admission of liquid, while
the orifices in the wall of the piston G are covered by the cylinder wall, thus pre-
venting any escape of the mixture through the said orifices.
It should be stated that the piston G can be replaced by a disc g¹, the outer
diameter of which is equal to the interior diameter of the cylinder C as shown in
Figure 3, such arrangement involving no change in the working of the apparatus.
Having now particularly described and ascertained the nature of the said inven-
tion, as communicated to me by my foreign correspondents, and in what manner
the same is to be performed, I declare that what I claim is :-
1. A carburettor comprising a cylinder provided with a piston or disc movably
pressed into the cylinder by a spring, a piston rod provided with a valve adapted.
on the movement of the piston, to open or close a tubular passage through which
liquid hydrocarbon is supplied, and a cone on said rod over which the liquid
hydrocarbon admitted flows in a thin sheet to be volatilized and mixed with air
introduced through the upper part of the cylinder, the whole being enclosed in
a casing provided with two tubular passages, one of which is preferably provided
with a means for regulating the supply of air to the mixing chamber and the
other is in communication with the motor cylinder, substantially as described.
2. In a carburettor of the kind described, a piston as G with a perforated
wall g, and filling material in its interior, a rod e with grooved upper portion,
valve as E, and cone as F, substantially as described.
3. The complete carburettor substantially as described or illustrated in Figure 1
or as modified in Figure 3, of the accompanying drawings.
Dated this 22nd day of December 1899
BOULT, WADE & KILBURN,
Agents for the Applicant::