An Improved Double Cylinder Gas or Oil Motor Engine.
Year: 1893

page_text: Date of Application, 3rd Jan., 1893
Complete Specification Left, 21st Oct., 1893—Accepted, 25th Nov., 1893
PROVISIONAL SPECIFICATION.
An Improved Double Cylinder Gas or Oil Motor Engine.
I JOHN FIELDING of Somerset Lawn in the City and County of Gloucester,
Engineer do hereby declare the nature of this invention to be as follows:-
This invention relates to an improved arrangement of double cylinder engine of
the "Otto" cycle, for the purpose of obtaining an impulse at each revolution of the
crankshaft when working at full power.
In a horizontal engine one of the cylinders is arranged in the usual manner
in relation to the crankshaft, except that its axial line is below that of the
crankshaft, at a distance about equal to one fourth of the stroke of the piston.
The second cylinder is placed on the opposite side of the crankshaft, in the same
axial line as the first, and facing in the same direction, so that its open end is
farthest from the crankshaft.
A pair of side rods, passing under the crankshaft, connect the two pistons
rigidly together suitable crossheads being formed upon or attached to the pistons:
for this purpose.
The valve gear is so arranged that one piston drives the crank during one forward
stroké, the second driving it during the next forward stroke, and SO on
alternately.
Two such double cylinder engines. acting upon opposite cranks on the same
crankshaft will give two impulses at each revolution of the shaft.
Dated this 31st day of December 1892.
JOHN FIELDING.
COMPLETE SPECIFICATION.
An Improved Double Cylinder Gas or Oil Motor Engine.
I JOHN FIELDING of Somerset Lawn in the City and County of Gloucester,
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:-
This invention relates to an improved arrangement of double cylinder engine of
the "Otto" cycle, for the purpose of obtaining an impulse at each revolution of the
crankshaft when working at full power.
In a horizontal engine one of the cylinders is arranged in the usual manner in
relation to the crankshaft, except that its axial line is below that of the crankshaft,
at a distance about equal to one fourth of the stroke of the piston.
The second cylinder is placed on the opposite side of the crankshaft, in the same
axial line as the first, and facing in the same direction, so that. its open end is
farthest from the crankshaft.
A pair of side rods, passing under the crankshaft, connect the two pistons rigidly
together suitable crossheads being formed upon or attached to the pistons for this
purpose.
The valve gear is so arranged that one piston drives the crank during one
forward stroke, the second driving it during the next forward stroke, and so
on alternately.
Two such double cylinder engines acting upon opposite cranks on the same
crankshaft will give two impulses at each revolution of the shaft.

page_text: DESCRIPTION OF THE DRAWINGS.
Figures 1 and 2 are respectively longitudinal sectional elevation, and plan.
Figures 3, 4 and 5, are transverse sections on lines, a a, b b. and c. c.
respectively.
In all these figures the same letters indicate the same parts. A A' being the
cylinders B B the pistons, C C¹ the crossheads on pistons. D D. the side rods
connecting same together. E E are the guides in which the crossheads work F is
the connecting rod gudgeon in piston crosshead C, G is the connecting rod and H
the crankshaft working in bearings I I.
The shaft rotates in the direction shown by arrow, the impulse being given
whilst the crank pin travels through the lower half circle from J to K.
Having now particularly described and ascertained the nature of my inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
In a four stroke cycle gas or oil motor engine, having two cylinders for the
purpose of obtaining an impulse at each revolution of the crankshaft, the
arrangement and connection of the cylinders and pistons in relation to each other
and to the crankshaft substantially as described.
Dated this 17th dass of Autobon 1902
JOHN FIELDING.