A folding mechanism for a treadmill including a handrail assembly
pivotally attached by a coupling shaft to both sides of the front end of
a base frame of a treadmill. Meanwhile, a positioning unit with an
engaging element is provided such that the handrail assembly can be
downwardly moved toward the base frame in an initial storage position.
Moreover, an n-shaped foot rest is swivelably disposed at the center of
the coupling shaft by a connecting arm. In this way, the n-shaped foot
rest can be extended from a front crossbar of the base frame by the
synchronic swiveling action of the coupling shaft when the handrail
assembly is moved in the initial storage position. In match with an
n-shaped supporting frame, the base frame can be brought into an upright
position to achieve a vertical and stable folding state.