Method for Starting Gas and Oil Motor Engines with Twin Cylinders.
Year: 1896

page_text: Date of Application, 18th Aug., 1898-Accepted, 26th Sept., 1896
[Communicated from abroad by THE GASMOTOREN FABRIK DEUTZ, of Koeln-
Deutz, in the Empire of Germany, Manufacturers.]
Method for Starting Gas and Oil Motor Engines with Twin
Cylinders.
1, CHARLES DENTON ABEL, of No. 28 Southampton Buildings, Chancery Lane,
in the County of London, Consulting Engineer and 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 ascertained in and by the following
statement:
In the Specification to my application for Letters Patent No. 12003 of 1896 was
described an arrangement for starting gas or oil motor engines, wherein, after
having brought the pistou into a certain position in the cylinder an explosivo
charge is forced into the latter while at the same time the piston was prevented by
a suitable device from being forced forward thereby, the said device being however
made to yield to the greater force produced by the explosion of the charge which
effected the starting of the engine.
According to the present invention this mode of starting is applied in a
modified manner to four-stroke-cycle gas and oil motor engines with twin cylinders
either placed side by side the cranks of which stand at au angle of 180° to each
other, or placed opposito each other, with the pistons connected to one and the
sume crank. For this purpose the cranks are first brought into a position about at
right nogles to the cylinder axis, so that the one piston stands at about the middle
of its working stroke while the other stands at about the middle of its compressing
stroke. Explosive mixture is then pumped by a band pump simultaneously into
both cylinders, so that the pressures thus produced on the one side of each piston
being equal but acting in opposite directions on their cranks, no motion of the
latter and consequently of the pistons can take place during such compression.
When a charge of the requisite degree of compressiou has thus been introduced
into each cylinder, that of the first named cylinder is ignited and thus imparts
rotary motion to the crank shaft, thereby effecting a farther compression of the
charge in the second cylinder, which is also ignited as soon as the dead centre has
been passed.
By this means the engine receives a farther powerful acceleration, which will
insure a reliable starting of the engine.
Figs. 1 and 2 of the accompanying drawings shew respectively an end view and
sectional front view of an engine with twin cylinders arranged side by side operated
in the above described manner, the cranks being at an angle of 180° to each other.
A A' are the two cylinders, B B the pistons, and C C' the connecting rods. The
compressing pump P for the explosive compound is connected by pipes to the inlet
valves vv of the two cylinders, so that these can be simultaneously oharged.
Fig. 3 shews a longitudinal section of an engine with opposite twin cylinders A A'
the pistons B B' of which are connected by rods C C to one and the saine crank,
so that when the crank is at the position shewn, at right angles to the cylinder
axis, the compressed charges can be forced in simultaneously behind each piston
by the pump
P without effecting any motion of the crank. In either of the above
cases assuming piston B to be at half working stroke, the charge in cylinder A. is
first ignited, thereby effecting the farther compression of the charge in A¹ which
is exploded, after the dead centre has been passed.

page_text: Having now particularly described and ascertained the nature of this inven
tion and in what manner the same is to be performed, I declare that what I
-claim is :-
Method of starting four-stroke-cycle gas or oil motor engines with twin cylinders
arranged either side by side with cranks at 180° to each other, or arranged
opposite each other, with their pistons connected to one and the same crank,
consisting in first bringing the crank or cranks into a position about at right angles
to the cylinder axie, then forcing combustible charges simultaneously into both
cylinders so that the pressures on the pistons balance each other, and then igniting
first the charge of the cylinder whose piston is performing the working stroke, and
-afterwards the charge of the second cylinder, substantially as described.
Dated this 18th day of August 1896.
ABEL & IMRAY,
Agents for the Applicant.