Improvements in Gas Motor Engines.
Year: 1891

page_text: Date of Application, 24th Jan., 1891
Complete Specification Left, 19th Sept., 1891-Accepted, 23rd Jan., 1892
PROVISIONAL SPECIFICATION.
Improvements in Gas Motor Engines.
I, HUGH WILLIAMS, of The Mount, Stockport, in the County of Chester,
Civil Engineer, do hereby declare the nature of this invention to be as follows:-
My invention relates to improvements in gas motor engines with the "Otto"
cycle of operations and my improvements consist chiefly in certain combinations
and arrangements of the parts particularly in the timing or setting of the ignition
valve relatively to the other valves.
In an engine of the above indicated type the piston,on its outstroke draws in a
charge of explosive mixture which it compresses on its instroke, the charge is then
ignited and the piston receives an impulse during its next outstroke and on its
instroke the waste products are expelled.
It is obvious that,an important feature. is the opening and closing of the several
valves at the proper time respectively and one part of my improvements consists
in so setting and timing the ignition valve that it is open and a charge fired at the
moment when the engine is at or about its dead centre.
To accomplish this and to work the other valves I employ a side shaft driven
from the crankshaft of the engine and upon this side shaft 1 secure four cams each
of which operates a pivoted valve lever one of the pivoted levers, of which there
are four, one for each of the four valves, .e. the gas admission valve, the air
admission valve, the ignition valve and the exhaust valve.
Another feature of my improvements. consists in the arrangement use and
application of a starting valve in connection with the combustion chamber; this
valve is controlled by hand and is open when the engine is to be started so as to
permit the unexploded charge or charges of combustible mixture to be discharged
through it instead of through the ordinary exhaust valve. The valve is.so arranged
as to close automatically to prevent air being drawn into the cylinder on the out-
stroke of the piston and the valve is closed and kept closed after the engine has
been started.
Dated this 2nd dam of tonuous 1801
H. B. BARLOW,
Agent for Applicant.
COMPLETE SPECIFICATION.
Improvements in Gas Motor Engines.
I, HUGH WILLIAMS, of Longacre, Edgeley, Stockport, in the County of
Chester, formerly of The Mount, Stockport aforesaid, Civil Engineer, 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:
My invention, relates to improvements in gas motor engines with the "Otto"
cycle of operations and my improvements consist chiefly in certain combinations
and arrangements of the parts particularly in setting and timing the opening
and closing of the ignition valve in such a manner that it is opened just before
the engine is at or about its dead centre and closed just at the moinent when
the products of combustion have been exhausted to atmospheric pressure and the
expelling instroke of the piston begins.
In an engine of the above indicated type the piston on its outstroke draws, in a
charge of explosive mixture which it compresses on its instroke, the charge is then

page_text: ignited and the piston receives an impulse during its next outstroke and on its
instroke the waste products are expelled.
It is obvious that an important feature is the opening and closing of the several
valves at the proper time respectively and one part of my improvements consists in
so setting and time the ignition valve that it is open and a charge fired at the
moment when the engine is at or about its dead centre.
To accomplish this and to work the other valves I employ a side shaft driven
from the crankshaft of the engine and upon this side shaft I secure four cams each
of which operates a pivoted valve lever; of which there are four, one for each of
the four valves, i.e. the gas admission valve, the air admission valve, the ignition
valve and the exhaust valve.
Another feature of my improvements consists in the arrangement use and
application of a starting valve in connection with the combustion chamber.
And in order that my invention may be fully understood and readily carried into
effect I will describe the accompanying sheet of drawings reference being had to
the figures and letters marked thereon.
Figure 1 is an end sectional elevation Fig. 2 an end elevation and Fig. 3 a
sectional plan of the combustion chamber end of a gas motor engine of the Otto
type to which my improvements are applied.
Fig. 4 is a vertical section taken on the plane of the line A B, Fig. 3.
.Figs. 5 and 6 are detail views of the starting valve.
In Figs. 1 to 4,-a designates the combustion chamber of the power cylinder,
the side shaft which is driven from the crankshaft, not shown; c, d, e, f, are the.
four cams secured upon the side shaft b, and which operate respectively the four
pivoted valve levers g, h, i, j; the came and lever control the gas admission
valve ; the cam d and lever h, the air valve ; the came and lever i, the ignition
valve m; and the cam f and lever j, the exhaust valve n. The several valves are
held normally closed by springs in the usual way.
The cam e must be so set that it will.open the ignition valve m just before the
engine is at or about its dead centre and the said valve will be closed just at the
moment when the products of combustion have been exhausted to atmospheric.
pressure and as the expelling instroke of the piston begins.
The exhaust valve n is closed and the air valve is opened at points varying
according to the length of stroke and horse power of the engine. The gas valve k
is opened as the piston begins its outstroke and the gas and air valves are closed
together after the piston has begun its compression or instroke at a point varying
according to the length of stroke and horse power of the engine.
The other feature of my improvements is, as already stated, the arrangement use
and application of the starting valve o (shown also in Fig. 6) in connection with
the combustion chamber a; this valve o is controlled by hand and is open when
the engine is to be started so as to permit the unexploded charge or charges of
combustible mixture to be discharged through it into the atmosphere instead of
through the ordinary exhaust valve n. The valve o is so arranged that by means
of a small clack or flap. o see Fig. 5, the exhaust port p is closed automatically to
prevent air being drawn into the cylinder on the instroke of the piston.
After the engine has been started the valve o is closed and kept closed, and the
waste products are then expelled through the ordinary exhaust valve n.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
:-
In a gas motor engine having the "Otto" cycle-
a
1. Setting and timing the opening and closing of the ignition valve in such
manner that it is opened just before the engine is at or about its dead centre, and
closed just at the moment when the products of combustion have been exhausted
to atmospheric pressure and the expelling instroke of the piston begins substan-
tially as herein described and illustrated.

page_text: 2. The combination with the combustion chamber of the power cylinder, of a
starting valve arranged substantially, as and for the purposes herein described and
indicated.
Dated this 18th day of September 1891.
H. B. BARLOW,
17, St. Ann's Square, Manchester, Agent for Applicant.