Patent ID: 7210445

Claim:
A piston-cam engine, which includes: a first drive cylinder; a first drive piston operably disposed within said first cylinder having a piston head and a shaft; a support frame having a generally cylindrical bearing surface; a drive shaft rotatable movably received within said cylindrical bearing surface; a cam connected to said drive shaft having a peripheral surface and having a plurality of lobes thereon; a roller member connected to said first piston shaft and adapted for engagement with said peripheral surface of said cam; and biasing means for biasing said roller member continuously against said peripheral surface of said cam, wherein said biasing means includes means for creating a vacuum on a bottom of said piston, said vacuum means including an air check valve in a bottom of said first drive cylinder to allow air to be driven out therethrough a down stroke and wherein said first piston is on an upstroke, said check valve generates a vacuum on the bottom of said first drive piston.