Patent ID: 7753659

Claim:
A motor assembly comprising: a body comprising a plurality of cylinders and a plurality of air channels; a conical shaped piston slidably coupled within each of said plurality of cylinders; a rotatable timing shaft positioned concentric to and at least partially housed within said body and in flow communication with an air source and said plurality of air channels, said timing shaft comprising an axis of rotation, a first end, a second end, and a timing shaft body extending therebetween, a first air passage extending longitudinally inward from said first end of said timing shaft partially through said timing shaft body in a first direction, a second air passage originating at said second end of said timing shaft and extending longitudinally inward and partially through said timing shaft body in a second direction opposite first direction such that said second air passage and said first air passage axially aligned with said timing shaft axis of rotation; and a cam plate coupled to said timing shaft and configured to engage said pistons and generate torque.