US PATENT SUBCLASS 123 / 74 R
.~.~ Cylinder

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

65 R  DF  TWO-CYCLE {24}
*  DD  .~ Rear compression {2}
74 R.~.~ Cylinder {7}
74 A  DF  .~.~.~> Fuel to rear of piston {1}
74 AP  DF  .~.~.~> Reduced portion of piston acts as guide
74 AC  DF  .~.~.~> Cross head between piston and crank
74 AE  DF  .~.~.~> Enclosed crankcase
74 B  DF  .~.~.~> Lengthwise bypass
74 C  DF  .~.~.~> Lengthwise cylinder combustion space
74 D  DF  .~.~.~> Slide valve between chamber of pump and crankcase

Unofficial Alpha Subclasses: R A AA AP AC AE B D

DEFINITION

Classification: 123/74

Two-cycle recompression internal-combustion engines having a cylinder closed at both ends and a piston reciprocating therein, such piston performing at the same time the functions of both a working piston and a piston for the pump which supplies a fresh charge to the engine, one end of the cylinder and the corresponding end of the piston constituting the working cylinder and piston, while the other or rear end of the piston and the corresponding end of the cylinder form a pump for introducing a new charge into the working end of the cylinder. In engines in this subclass the supply or exhaust ports, or both, are generally formed in the cylinder-wall and are then controlled by the piston as it reciprocates, the piston forming a closure for such ports when it is required that they be kept closed.