Movement No. 175 demonstrates a specialized mechanism that produces one complete revolution of the engine crank for each single stroke of the piston — rather than the usual half-revolution per stroke seen in a standard crank-and-connecting-rod arrangement. In a conventional engine, the piston completes one full stroke (from top to bottom or bottom to top) for every half-turn of the crank, requiring two strokes per full revolution. This mechanism instead uses an intermediate linkage or gearing arrangement so that a single linear stroke of the piston drives the crank through a complete 360-degree rotation. This unusual motion relationship can be useful in specialized engine designs where a different relationship between piston stroke frequency and crankshaft speed is desired, such as for matching output speed requirements or for unique mechanical timing applications in early experimental engine configurations.
175. A means of giving one complete revolution to the crank of an engine to each stroke of the piston.