US PATENT SUBCLASS 123 / 78 R
.~ Variable clearance

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

311  DF  FOUR-CYCLE {19}
78 R.~ Variable clearance {6}
78 A  DF  .~.~> Piston in head adjusted mechanically {1}
78 B  DF  .~.~> Varying means is in the piston {1}
78 C  DF  .~.~> Cylinder or sleeve moved
78 D  DF  .~.~> Auxiliary chamber
78 E  DF  .~.~> Varying means is in the connecting rod
78 F  DF  .~.~> Varying means is in the crankshaft

Unofficial Alpha Subclasses: R A AA B BA C D E F

DEFINITION

Classification: 123/78

Four-cycle internal-combustion engines provided with means whereby the clearance-space is varied in unison with the movement of the working piston, being as far as practicable eliminated at the end of the exhaust-stroke and greatest at the end of the compression-stroke, whereby to secure a more complete removal of the residual burned gases from the

cylinder and combustion-chamber of the engine. The clearance-space is ordinarily varied by causing the strokes of the working piston to vary in length, and the four strokes required for a complete cycle are frequently performed during a single revolution of the main shaft of the engine.

SEE OR SEARCH CLASS

92, Expansible Chamber Devices,

84, for an expansible chamber device having a resilient means interposed between the working member and a relatively movable power transmission element.