IN GAS ENGINES
Year: 1880

page_text: PROVISIONAL SPECIFICATION left by Charles Max Sombart at the Office of
the Commissioners of Patents on the 28th April 1880.
CHARLES MAX SOMBART, of the Firm of Buss, Sombart, and Company, Engineers
"IMPROVEMENTS
and Patent Agents, of Magdeburg, in the Empire of Germany.
IN GAS ENGINES."
1
This Invention relates, first, to the employment of a valve mechanism arranged
externally to the cylinder, and, secondly, to a combined gas and air inlet valve.
The valve mechanism is arranged and operated in the following manner, viz.:-
The slido valvo works outside the cylinder between a seat formed on the
cylinder and a seat formed upon a covering plate. This valve is cast hollow, and is
provided internally with two clack valves, by means of which the inlet passage for
gas and air and the outlet for burnt gases are enabled to communicate with a
passage and orifice in the cylinder. The latter serves both for the admission of the
mixture of gas and air drawn into the cylinder on the ascent of the piston, as well
as for the discharge of the products of combustion, which are expelled when the
piston descends. Two orifices are provided in the valvo cover, one of which serves
for the introduction of gas and air, whilst the other serves for the escapo of the
burnt gases.
The valve partakes of an intermittent reciprocating motion with periods of
repose between each two strokes, and is actuated by means of a lever and valvo
gear in accordance with the arrangement described in the Specification to former
Letters Patent granted to me, dated the 14th May 1879, No. 1933.
In working the engine a certain quantity of gas and air is by the ascent of the
piston drawn from the combined gas and air valve hereinafter described through
the corresponding passages through one of the clack valves and the orifice before
referred to into the cylinder. The eccentric should be so adjusted in relation to the
piston that when the piston is in its lowest position the centre of the eccentric
assumes its extreme position on the left. The orifico in the cylinder will then be
open to its fullest extent and the slide valve just commences to close the orifice
slowly, and by the time the piston reaches the igniting valve the orifice is
completely closed.
During the explosion which then ensues and the continued upward progress of
the piston the slide valvo remains stationary in its position, closing the inlet valvo
until the piston has nearly reached its highest position, when the slide valve is
again pushed back by the eccentric, and the passage and orifice in the cylinder are

page_text: again opened, so that the products of combustion expelled by the piston on its
downward stroke are enabled to escape through the said passage and orifice through
the other clack valvo and the outlet pipe.
The introduction of the mixture of air and gas is effected through the combined
gas and air valve next hereinafter described.
In a case or chamber there are provided two valves, the upper one of which
allows gas to pass from a chamber through orifices in the valve seat into the space
between the two valves, whilst the lower valve admits air into the same place
through the lower opening. The two valves are rigidly connected together by a
valve spindle common to both, so that both valves may be elevated and lowered
simultaneously. Now when the piston commences its upward stroke a suction
action takes place, whereby the lower valve is lifted and admits air; the upper
valve is also elevated at the same time, the air valve being of considerably large
area, and in consequence of the excess of atmospheric pressure on the lower valve
overcoming the pressure of gas upon the upper valve. The requisite proportion of
gas is consequently drawn in simultaneously with the air, and as the gas is caused
to enter through a number of small holes and to flow in an opposite direction to
that of the air a very intimate mixture is effected. The extent of the motion of
the two valves may be accurately adjusted and determined by means of a set screw
or by a governor driven by the engine..