Patent ID: 6945044

Claim:
A dual cycle hot gas engine comprising pistons which are movable inside one another, characterized in that a dual external piston ( 2 ) is arranged to be axially movable inside a basic cylinder member ( 1 ) and a dual internal piston ( 3 ) is arranged to be axially movable inside the dual external piston ( 2 ), wherein the dual external piston and the dual internal piston each comprise two double-acting single pistons rigidly connected with each other, and wherein the basic cylinder member ( 1 ) includes two outer end walls and a central partition in parallel with the same whereby two like spaces are formed in the interior of the basic cylinder member ( 1 ), with the rigid interconnection between the two double-acting single pistons of the dual external piston and the rigid interconnection between the two double-acting single pistons of the dual internal piston extending through the central partition.