Patent ID: 7273004

Claim:
Reciprocating machine with annularly arranged, radially directed piston-cylinder units ( 2 , 3 ) and with an eccentric shaft ( 12 ) extending through a casing body ( 4 ) of an machine casing ( 5 ) enclosing the cylinders ( 3 ) and having a cam ( 11 ) for controlling an outward stroke of the pistons ( 2 ), an inward stroke of the pistons ( 2 ) being controlled by a common control ring ( 16 ) engaging in the pistons ( 2 ), characterized in that the engagement of the control ring ( 16 ) takes place in a lateral recess ( 17 ) of each piston ( 2 ) running in a direction of a secant and adapted to a cross-sectional shape of the control ring ( 16 ) and which bounds a base wall of the piston ( 2 ), the control ring ( 16 ) being in controlling sliding contact via an inner control face ( 20 ) with said base wall ( 18 ).