Fuente: WIPO "rice" 2595. Rice, J. H. Feb. 2. Gas and l i k e e n g i n e s.-Engines working on a two-stroke c y c l e are made without mechanically - ope- rated valves. The piston c a r r i e s a head b working in the cylinder c to compress the charge and force it past the valves f, k into the cylinder i. The charge is drawn through the valve d. When the piston uncovers the ex- haust ports l, most of the gases escape and the charge enters and drives them completely out. It then fills the cylinder itself at atmospheric pressure so that no escape takes place. With multi-cylinder engines, a check valve may be fitted in the exhaust passage, and the com- pressor of one cylinder used to feed an adjacent cylinder. In Fig. 3 an engine with opposing pistons is shown, in which only one piston is used for compressing the charge into a receiver h which communicates with the cylinder i by the valve k the exhaust taking place through separate valves l which are uncovered simultaneously. The two main shafts are preferably geared by a side shaft and bevel-wheels.