IPIQ

MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING

F01

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

F01B

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

11/00

Reciprocating-piston machines or engines without rotary main shaft, e.g. of free-piston type

F01B11/004

in which the movement in the two directions is obtained by two single acting piston motors, each acting in one direction