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Publication of GB163880ApublicationCriticalpatent/GB163880A/en
163,880. Lewns, E. P. April 10, 1920. Two - stroke - cycle engines; driving-gear.-A double-acting pump for combustible mixture is arranged coaxially with a double-acting working cylinder A having separate inlet and exhaust ports C, D for each end of the cylinder. Passages M, M<1> place the ends of the pump in communication with the ports C, C' respectively. The pistonrod F is slotted at 0 and extends beyond the crank shaft a pair of return connecting rods, one of which is shown in Fig. 1, transmitting the motion of the piston rod to the crank-shaft N. Each crank carries balanceweights R.