Abstract: A heart pump has a pump chamber and a pump element that strokes between a retracted and an extended position. A motor rotates a drive shaft in a single direction. A reversing mechanism coupled between the drive shaft of the motor and the pump element converts rotary motion of the drive shaft to reciprocal stroking movement of the pump element. A mechanical stroke length controller connected to the reversing mechanism varies the stroke length in response to changes in fluid pressure in the pump chamber.

Abstract: A blood flow pump has a housing with an axis. The pump is mounted concentrically about the axis in the housing, defining a chamber. A pusher plate in the housing is concentric with the axis. The pusher plate is substantially non-rotatable relative to the housing and movable in forward directions along the axis. A pair of driven magnets are mounted to the pusher plate and offset from the axis. A pair of driving magnets are mounted to a support member that is driven by a drive shaft. The driving magnets are offset from the drive shaft so that when rotated, their magnetic fields pass through the magnetic fields of the driven magnets. The magnetic field are arranged to oppose each other, creating a repelling force to cause the pusher plate to push the pump element in a pressure stroke direction.

Abstract: A heart pump has a pump chamber and a pump element that strokes between a retracted and an extended position. A motor rotates a drive shaft in a single direction. A reversing mechanism coupled between the drive shaft of the motor and the pump element converts rotary motion of the drive shaft to reciprocal stroking movement of the pump element. A mechanical stroke length controller connected to the reversing mechanism varies the stroke length in response to changes in fluid pressure in the pump chamber.

Abstract: An adjustable crank shaft for a pump or engine allows the stroke of the piston to be varied. The piston rod has a circular bushing that engages an outer diameter portion of an outer crank member. The outer crank member has an inner diameter portion with a circular crank surface that is eccentric to the outer diameter portion of the outer crank member. An inner crank member has an outer diameter portion in sliding engagement with the crank surface of the outer crank member. The inner crank member is rotatable about a main drive axis that is eccentric relative to the outer diameter portion of the inner crank member. The outer crank member has a set of gear teeth on an inner diameter portion that are eccentrically offset from the crank bushing surface. An adjustment gear is in engagement with the gear teeth and mounted on a gear shaft that is coaxial with the main drive axis. The outer crank member revolves about the adjustment gear as the piston strokes and the adjustment gear is stationary.

Abstract: A drive apparatus, particularly for an internal combustion engine, allows the compression ratio to be changed while operating. A piston is slidably carried in a cylinder. The piston rod engages a power gear via an eccentric link. The power gear rotates around a rim gear. The rim is biased to a maximum stroke position, however it is allowed to rotate toward an increased torque minimum stroke position.

Abstract: A drive mechanism can be utilized either as a pump or an engine. The device has a piston and cylinder. The piston has a rod that connects with a power gear via a link pin that joins the power gear at a point offset from the power gear shaft. The power gear orbits about a rim gear. A crankshaft gear mounted to a primary shaft is rotated by the orbital movement of the power gear. The rim gear and power gear can be placed in position to constrain the rod to move along the axis of the cylinder. Also, the rim gear can be rotated to a different position so as to cause the end of the rod to orbit with the power gear. This position can be selected to change the stroke length and thus the torque.

Abstract: A drive mechanism can be utilized either as a pump or an engine. The device has a piston and cylinder. The piston has a rod that connects with a power gear via a link pin that joins the power gear at a point offset from the power gear shaft. The power gear orbits about a rim gear. A crankshaft gear mounted to a primary shaft is rotated by the orbital movement of the power gear. The rim gear and power gear can be placed in position to constrain the rod to move along the axis of the cylinder. Also, the rim gear can be rotated to a different position so as to cause the end of the rod to orbit with the power gear. This position can be selected to change the stroke length and thus the torque.