Convertible engine-air compressor apparatus mounted on a vehicle for driving said vehicle

A convertible engine-air compressor apparatus adapted to be mounted on a vehicle for driving said vehicle comprising a body having a plurality of compression chambers in which explosion can take place, each of said compression chambers being provided with an inlet and an exhaust openings, an inlet valve and an exhaust valve mounted in the body for each compression chamber for opening and closing the inlet and exhaust openings, a piston reciprocably mounted within each compression chamber, crank shaft means rotatably mounted in the body and connected to the pistons for reciprocating the pistons, two cam shafts rotatably mounted on the body and connected to the crank shaft to be rotated thereby, a pair of cams for each inlet valve and each exhaust valve for each compression chamber mounted on a first cam shaft, each cam of each pair comprising a cylindrical segment, an engine action segment and an air compressor action segment, each of said segments adapted to engage tappet means, said tappet means reciprocably mounted on the body for each inlet and each exhaust valve for opening and closing the valves, said cylindrical segment adapted not to reciprocate the tappet means, said engine action segment adapted to reciprocate the tappet means once during each revolution of the associated cam shaft, said air compressor action segment adapted to reciprocate the tappet means twice during each revolution of the associated cam, an air port being provided between the inlet opening and the exhaust opening of each compression chamber, a valve being provided for each air port, a third cam for opening and closing said air port by means of a tappet means for said air port mounted on a second cam shaft for the air ports which is also mounted on the body and connected to said crank shaft to be rotated thereby, the third cam for said air port comprising a cylindrical segment, a rotation starting segment and a residual air exhaust segment, each segment of the third cam adapted to engage the tappet means for said air port, the tappet means for said air port reciprocably mounted on the body for opening and closing the air port valve and the cylindrical segment of said third cam adapted not to reciprocate the tappet means for said air port, said rotation starting segment adapted to reciprocate the tappet means for said air port once during each revolution of the second associated cam shaft, said residual air exhaust segment adapted to reciprocate the tappet means for said air port twice during each revolution of the second cam shaft, the first and the second cam shafts axially adjustable and mounted on the body so that the rotation starting segment of the third cam for said air port may engage the tappet means for the air port when the tappet means being in contact with the engine action segment of each cam of each pair, the cylindrical segment of the third cam for said air port may engage the tappet means for said air port, when the tappet means being in contact with the engine segment of each cam of each pair, the residual air exhaust segment of the third cam for said air port may engage the tappet means for said air port when the tappet means being in contact with the compressor action segment of each cam of each pair.