The present invention is configured to use an operating rod to simultaneously drive a linking rod with a first adjustable length and a linking rod with a second adjustable length. The linking rod with the first adjustable length has one end arranged above a first two-directional ratchet and is configured to drive a first ratchet loading ring of the first two-directional ratchet to perform non-full circle rotation. The linking rod with the second adjustable length has one end arranged under a second two-directional ratchet and is configured to drive a second ratchet loading ring of the second two-directional ratchet to perform non-full circle rotation. The first two-directional ratchet and the second two-directional ratchet are arranged at one side of the same ratchet shaft so as to allow the ratchet shaft to be driven by the operating rod. Through a selection of a switcher, a ratchet is operated to mesh with a ratchet ring to perform a forward or backward full circle rotation by alternating two non-full circle rotations. The other ends of the linking rod with the first adjustable length and the linking rod with the second adjustable length are arranged on the same linking rod rotational common shaft, for synchronously pushing and driving forward or backward. The linking rod rotational common shaft is arranged at the middle section of the operating rod, where one end of the operating rod functions as a pivot point and the other end of the operating rod functions as a handle, for saving force according to the lever principle. As such, the present invention can be utilized for designing a stepless transmission capable of moving up and down so as to be adapted to a variety of terrains or hydrological fields.本創作提供一種以一操縱桿同時帶動一第一長度可調之連桿、一第二長度可調之連桿,該第一長度可調之連桿一端設置在一第一雙向棘輪上方,負責驅動該第一雙向棘輪的第一棘爪裝載環,作非全圓周轉動,該第二長度可調之連桿一端設置在一第二雙向棘輪下方,負責驅動該第二雙向棘輪的第二棘爪裝載環,也作非全圓周轉動,並將該第一雙向棘輪、該第二雙向棘輪,設置於同一輪軸之一側,以利輪軸受操縱桿的驅動,透過切換器的選擇,操控棘爪嚙動棘齒環,由兩非全圓周轉動交替成為,作向前或向後的全圓周的轉動;該第一長度可調之連桿、該第二長度可調之連桿另一端設置在同一連桿旋轉共軸
