Wind-drag type climber

Claim 1

A climber comprising: a base frame; a handlebar assembly fixed on said base frame so that a user can grip thereon; a horizontal driving shaft, journalled on said base frame, including a left sprocket and a right sprocket which are sleeved rotatably on said driving shaft, each of said left and right sprockets being equipped with a unidirectional bearing for locking a corresponding said sprocket on said driving shaft only when said corresponding sprocket rotates in a predetermined direction; two swing arms mounted pivotally on said base frame at one end thereof, each of said swing arms carrying a pedal on the other end thereof in such a manner that said swing arms can rotate about a horizontal axis; two aligned first pulleys disposed on said base frame in such a manner that each of said first pulleys can rotate about a horizontal axis and that said axes of said first pulleys are perpendicular to the axis of said driving shaft; a drawing member fastened to said pedals at two ends thereof and having two chain-like sections respectively engaged with said left and right sprockets, and a cable-like section extending around said first pulleys, said cable-like section being capable of rotating relative to said chain-like sections, said first pulleys guiding said drawing member to reciprocate along a generally U-shaped path, said chain-like sections and said cable-like section of said drawing member being arranged so that reciprocation of said swing arms can be converted into rotation of said left and right sprockets, thereby rotating said driving shaft in said predetermined direction; a second pulley disposed on said base frame between said swing arms; a flexible reciprocating element, fastened to said pedals at two ends thereof, extending around said second pulley so that downward movement of either of said pedals can move the other of said pedals upward; a wheel axle journalled on said base frame; a wheel body sleeved rigidly on said wheel axle and having a plurality of generally radially extending wheel blades which create air impedance to rotation of said wheel body; and a speed-increasing mechanism interconnecting said wheel axle and said driving shaft so as to rotate said wheel axle at a speed greater than that of said driving shaft.