An apparatus for the transfer of linear human power to a rotating member
is disclosed, which is adaptable to exercise equipment, wheeled chairs,
scooters, bicycles, tricycles, etc. The hands of the operator apply the
power during the downward stroke of an up-and-down pumping action, and
many of the operator's muscle groups are employed. Various drive ratios
are provided, and the mechanism is simple with few components. A
preferred embodiment is detailed in which the apparatus is used to propel
a scooter.