| 摘要 |
A pair of oppositely directed pistons are reciprocatingly mounted in a cylinder. The cylinder is formed unilaterally with and encapsulated within a tank for receiving compressed air and has an exhaust port at each end and a valve for controlling the flow of air into the tank. Each piston has a head with an aperture and a unidirectional valve for controlling air flow into the cylinder. An air inlet to the cylinder is located between the piston heads. A motor has a drive shaft extending through the air inlet and a transmission connected to the pistons drives the pistons synchronously in opposing, reciprocating strokes.
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