Year: 1888

page_text: We EDOUARD DELAMARE DEBOUTTEVILLE and LEON PAUL CHARLES MALANDIN
both of Fontaine-le-Bourg Seine Infèrieure in the Republic of France Engineers 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
-
Our Invention relates to improvements in starting gear of the class described in the
Specification to Letters Patent granted to James Yate Johnson and dated 24th February
AD 1888 No 2805. By means of the present invention the starting of the engine is
enabled to be effected without working the piston by hand in order to draw in gaseous
mixture during a fraction of the stroke and to compress the charge thus drawn in as
described in the said former Specification-With this object the cylinder is provided
with a cock or valve by means of which the inert gas in the cylinder can be blown out
or discharged as hereinafter explained
And in order that our said invention may be fully understood we shall now proceed
more particularly to describe the same and for that purpose shall refer to the several
figure, on the annexed sheet of drawings the same letters of reference indicating
corresponding parts in all the figuies
It also
Figure 1 of the accompanying drawings is an elevation partly in section illustrating
starting gear arranged according to the Invention described in the said former
Specification This view shows the admission valve box and gas chamber g
represents in dotted lines an igniter J, which is connected with the gas box g by a
three way cock k connected to a branch h by means of a rubber tube >.
Figure 2 is a diagram illustrating the action of the cam or excentric.
Figure 3 is a section of the three way cock k connected to the chamber of the
igniter J, which is also shown in section in this figure with the two insulated
conducting wires.
Figures 4 and 5 are respectively views in section and elevation of the cock..
Figure 6 is an end view in elevation of the induction coil and Figure 7 is a plan of
the switch arrangement connected with the electric igniter
The diagram Figure 2 represents the fours periods of the cycle of operations
performed in working the engine the radial lines indicating the successive angular
displacements of the cam or excentric operating the valve or slide the said cam or
excentric being caused to describe one complete revolution to two revolutions of the
crank shaft in the usual manner
The shaded segment between a and b represents the angle through which the cam

page_text: 01 excentric is caused to move during the first period that is to say the period during
which the gascous mixture is drawn into the cylinder when the engine is working in
the usual manner the cam or excentric being rotated in the direction of the arrow.
The piston then returns and compresses the mixture whilst the cam moves from 6 to c.
The explosion takes place between c and d, and the burned gases are expelled by the
second inward stroke of the piston whilst the cam moves from d to a and thus returns
to its original position in readiness for the next cycle.
Figure 8 represents a modified arrangement of the cock admitting the gaseous
mixture and of the igniter.
Figure 9 shows the explosion chamber provided with a cock or valve for discharging
its contents according to this invention.
The general construction and arrangement of this starting gear is similar to that
described in the said former Specification but with an engine provided with starting
gear arranged according to our present invention a cock R is placed on the com-
presssion chamber as indicated in fig 9 and in order to start the engine the cam must
first be placed at the point f Figure 2-This position is obtained when the engine is
stationary either by manipulating the cock R or by means of suitable gear acting on
the fly wheel. The engine is then started by completely opening the cock R (Fig 9)
and the cock (figures 1. 3 4 and 5) and afterwards opening the valve Z to the usual
extent for starting The inflammable gases inside the cylinder then escape freely into
the atmosphere through the cock R being driven out by the pressure of the gaseous
mixture entering through the cock l. The gas under pressure enters through the
hole o figures 3 and 4 drawing in air through the hole n and diving this an into the
cylinder through the passage a p Figure 4 By these means the cylinder is quickly
cleared of the inert gas which it contains and is filled with an explosive mixture at
atmospheric pressure. The cocks R and k are then closed and the mixture exploded
by an electric spark as described in the said former Specification or otherwise. The
impulse thus given to the fly wheel is sufficient to start an engine of any size.
E
In order to start the engine with the arrangement illustrated in figure 8 a stop
cock and a threeway cock B corresponding to the cock marked k in Figures 3 and 4
are opened to admit the explosive mixture Then the cock ẞ is shut and the spark
caused to pass in an igniter d The explosion then takes place the piston is driven
forward and the fly wheel acquires sufficient velocity to start the engine-The starting
being thus effected the cock is shut immediately after the first explosion.
Having now particularly described and ascertamed the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
claim is.
1 In combination with starting gear of the class herein before described a cock or
valve R communicating with the cylinder and enabling the gas to escape freely from
behind the piston as and for the purpose substantially as hereinbefore described
2. In combination with starting gear of the class hereinbefore described the
arrangement whereby the engine is enabled to be started by first placing the cam us
described then introducing an explosive mixture into the cylinder by the employment
of a supply cock or valve k acting in combination with a discharge cock or valve R
and afterwards igniting the explosive mixture thus introduced substantially as her ein-
before described.
3 The arrangements and combinations of parts constituting the improvements in
- starting gear for gas engines substantially as herein before described with reference to
the accompanying drawings.