US PATENT SUBCLASS 123 / 73 R
.~.~ Crankcase

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

65 R  DF  TWO-CYCLE {24}
*  DD  .~ Rear compression {2}
73 R.~.~ Crankcase {17}
73 A  DF  .~.~.~> Fuel to crankcase
73 AA  DF  .~.~.~> Ported piston {1}
73 AB  DF  .~.~.~> Inlet valve in head
73 AC  DF  .~.~.~> Varies compression space
73 AD  DF  .~.~.~> Lubricant oil and fuel mixing devices
73 AE  DF  .~.~.~> Auxiliary piston moves synchronously with piston to enlarge volume of crankcase or incoming charge
73 AF  DF  .~.~.~> Crankcase compression with auxiliary pump means
73 B  DF  .~.~.~> Fuel to bypass {1}
73 C  DF  .~.~.~> Fuel to cylinder {3}
73 D  DF  .~.~.~> Disc valves {1}
73 E  DF  .~.~.~> Reentrant cylinder head
73 F  DF  .~.~.~> Stepped piston {1}
73 S  DF  .~.~.~> Supercharging of crankcase
73 V  DF  .~.~.~> Valves for crankcase
73 SC  DF  .~.~.~> Returns charge to crankcase or rejects to exhaust
73 PP  DF  .~.~.~> Distinct passages from crankcase to cylinder
73 SP  DF  .~.~.~> Slow-speed operation

Unofficial Alpha Subclasses: R A AA AV AB AC AD AE AF BA CA CB CC DA FA S SC PP SP

DEFINITION

Classification: 123/73

Two-cycle recompression internal-combustion engines having a cylinder closed at one end and an air-tight casing inclosing the connecting-rod and crank and forming a closed crank-case in open communication with the other end of the cylinder and a piston reciprocating in the said cylinder, 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, together with a closed crank-case 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.