US PATENT SUBCLASS 123 / 51 A
.~ Four-cycle

Current as of: June, 1999
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123 /   HD   INTERNAL-COMBUSTION ENGINES

51 R  DF  MULTIPLE PISTON, COMMON NONRESTRICTIVE COMBUSTION CHAMBER {2}
51 A.~ Four-cycle {2}
51 AA  DF  .~.~> Four-cycle separate crankshaft for piston
51 AC  DF  .~.~> Two or more combustion chambers between the piston

Unofficial Alpha Subclasses: R A AA AC B BA BB BC BD

DEFINITION

Classification: 123/51

Internal-combustion engines comprising two working pistons moving simultaneously in the opposite directions in a single cylindrical structure composed of two working cylinders arranged tandem with a combustion-chamber between and in permanently open communication with both said cylinders or

two working pistons moving in like manner in two similarly-arranged cylinders whose axial lines when extended are parallel and adjacent and which communicate with a single combustion chamber, as above, whereby the gases resulting from the combustion of a combustible mixture within the combustion-chamber as they expand act with equal pressure upon both pistons and transmit substantially equal amounts of power through each piston to the main driving shaft of the engine, and internal-combustion engines comprising two or more such units as are above defined.

SEE OR SEARCH CLASS

91, Motors: Expansible Chamber Type,

170+, and 508+ for multi-piston or cylinder type expansible chamber motors.

92, Expansible Chamber Devices,

61+, for an expansible chamber device having relatively movable working members.