136403 ⎘
Reciprocating-piston machines or engines with cylinder axes coaxial with, or parallel or inclined to, main shaft axis the piston motion being transmitted by curved surfaces by multi-turn helical surfaces and automatic reversal the helices being arranged on the pistons
MULTI-STAGE SYSTEM
#2Mechanism for converting motion
#3Internal combustion engine , improvements in design and efficiency
#4Axially rotating free piston
#5System for the conversion of a rectilinear swaying motion into a rotating motion and vice versa