Pump to ride

Students at the
University of
Wisconsin in
Madison, USA, have
devised a more
efficient trike, a
human-powered
vehicle somewhat
like a bicycle but
with three or four
wheels, for disabled
people who
cannot use their
legs to get around.
it has a novel
up-and-down pump
drive mechanism that
people work
with their arms.
This provides more
power than other
cycles for the
disabled, which
usually use band
cranks imitating
bike pedals, or a
rowing motion. The
trike's up-and-
down handlebars also
contain the
controls for brakes
and shifting
gears, as well as a
steering. The
students have a
patent pending on
the new drive
mechanism.