Abstract: The subject of the invention is self propelled submergible pump that is placed on the bottom of a water course and obtains propelling energy from the dynamic force of the movement of the water mass in which is placed. It consists of pumping hi-pressure part integrated with horizontally placed system of the driving blades pairs, of which one half constantly turns its largest C surface against water stream and the second half turns its many times smaller surface against the water stream which causes a simultaneous rotation of the blades and continuous self propelled pumping of the submergible pump.

Abstract: The invention involves a supplementary driving mechanism of the muscle-driven vehicle for accelerated rehabilitation of a paralyzed arm, designed for different categories of handicapped persons, primarily those who due to their inability to walk use a wheelchair and have additional troubles with the force of their hands or whose brain has been injured by stroke or mechanical damage and have one arm paralyzed in part or in whole.

Abstract: The invention comprises a drive system for use in association with a wheelchair. The drive system includes at least one input gear system, a structure for powering at least one input gear system, at least one transfer gear system, a positioning member, and a structure for transferring movement of the transfer gear system to a wheel. The positioning member positions the desired one of at least two sets of gears of the at least one transfer gear with at least one of the two sets of gears of the at least one input gear system through slidable movement of the at least one of the transfer gear system and the input gear system along their respective axes of rotation. This, in turn, engages the desired gear of the transfer gear system to the desired gear of the input gear system during continuous rotation of these gears. Additionally, the invention includes a handle member for use with a linear conversion system.