Stepping exerciser step plates link motion mechanism

Claim 1

For accurately forcing the two step plates of a stepping exerciser to smoothly alternatively oscillate back and forth at the two opposite sides of a base plate during stepping exercises, a step plates link motion mechanism comprising: a mounting plate secured to said base plate of said stepping exerciser at the bottom of said base plate; a lever pivotably secured to said mounting plate by a pivot bolt, having two axle seats at two opposite ends and respectively disposed beneath said two step plates, said axle seats having each a through-hole through the central axis of said lever; a pair of holder plates respectively secured to said two step plates at the bottom of each respective step plate, and disposed above said lever, said pair of holder plates having each a through-hole disposed in parallel with the through-hole of said axle seats; a first pair of axles respectively rotatably fastened in the through-hole of said pair of holder plates, each having a notched end respectively disposed outside said pair of holder plates; a second pair of axles respectively rotatably fastened in the through-hole of said two axle seats; and a pair of flat rocker arms each having one end pivotably fastened in the notched end of said first pair of axles by a pivot pin and an opposite end pivotably fastened in the notched end of said second pair of axles.