Machines or engines with two or more pistons reciprocating within same cylinder or within essentially coaxial cylinders

Classification Context

Section:

MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING

Class:

MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES

Subclass:

MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES

Child Classifications

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• F01B 7/02 with oppositely reciprocating pistons
• F01B 7/16 with pistons synchronously moving in tandem arrangement
• F01B 7/18 with differential piston
• F01B 7/2 with two or more pistons reciprocating one within another, e.g. one piston forming cylinder of the other