Treadmill with lateral shift gain effect

Abstract

A treadmill is provided which allows a lateral shift rack to be set over the pedestal of the main framework, and the lateral shift rack is provided with a treading mechanism. The lateral shift rack is driven to yield reciprocating lateral shift through circumferential movement of the crank linking frame when two pedals of the treading mechanism are treaded to shift vertically. When the treadmill is treaded, lateral shift will occur simultaneously. Based on the driving compensation mechanism, when the left and right pedals are treaded, the end point could be further shifted to a preset distance, so as to compensate the treading path of two pedals, and improve the operational flexibility, the fitness effect and value of the treadmill.

1 . A treadmill with lateral shift gain effect, comprising:
 a main framework, comprising of a pedestal and two floorstands vertically set at interval over both sides of the pedestal;   a lateral shift rack, set transversely overhead the pedestal of the main framework in a transverse shift state;   a treading mechanism, set onto the lateral shift rack; the treading mechanism comprises of a base frame, an upper swinging rod assembly, a lower swinging rod assembly, an extension arm and two pedals; the bottom of the base frame is assembled onto the lateral shift rack, and the middle portions of the upper/lower swinging rod assemblies are bolted on top of the base frame; the bottom of two pedals is provided with an assembly seat for coupling with two ends of the upper/lower swinging rod assemblies; the extension arm is extended to either end of the upper or lower swinging rod assembly, and then a pivoted portion is set on the end of the extension arm;   a crank linking frame, comprising of a positioning end and a moveable end; of which the positioning end is bolted onto a fixed position of the main framework, and the moveable end is connected with the pivoted portion on the extension arm of the treading mechanism;   a driving compensation mechanism, assembled between the positioning end and moveable end of the crank linking frame, comprising of a central fixed pulley, a rotary rack, a rotary movable pulley, a driving member and an externally biased crank lever; of which, the central fixed pulley is fastened onto the positioning end of the crank linking frame; the rotary rack comprises of a rotating branch part and a rotating end, of which the rotating branch part and the central fixed pulley are co-axially arranged; the rotary movable pulley is bolted on the rotating end of the rotary rack, such that the rotary movable pulley and the central fixed pulley are co-axially arranged at interval; the driving member is used to connect the rotary movable pulley and the central fixed pulley, enabling synchronous rotary movement during circumferential displacement of the rotary movable pulley along with the rotary rack; one end of the externally biased crank lever is connected with the moveable end of the crank linking frame, and the other end is coupled with the center of the rotary movable pulley;   when two pedals of the treading mechanism are treaded to shift vertically, the lateral shift rack is driven to yield reciprocating lateral shift through circumferential movement of the crank linking frame.   
     
     
         2 . The structure defined in  claim 1 , wherein the driving member comprises of a belt and two idler pulleys; these two idler pulleys are assembled at interval onto the other end of the rotary rack, and configured triangularly with the central fixed pulley; the first end's inward side of the belt bypasses the rotary movable pulley, the second end's outward side of the belt bypasses the central fixed pulley, and the second end's inward side of the belt bypasses separately two idler pulleys. 
     
     
         3 . The structure defined in  claim 1 , wherein a roller assembly is set between the lateral shift rack and the pedestal of the main framework; said roller assembly is also set on either of the bottom of the lateral shift rack or overhead the pedestal; during lateral shift of the lateral shift rack, it is possible to realize horizontal shift through the support of said roller assembly. 
     
     
         4 . The structure defined in  claim 1 , wherein said main framework is provided with a damper, which is connected with the crank linking frame via a driving member, thus offering resistance against the rotation of the crank linking frame. 
     
     
         5 . The structure defined in  claim 1 , wherein said upper swinging rod assembly is of a single-rod or double-rod structure; if the upper swinging rod assembly is of a single-rod structure, the pivotal axis can be set non-coaxially or co-axially. 
     
     
         6 . The structure defined in  claim 1 , wherein said lower swinging rod assembly is of a single-rod or double-rod structure; if the lower swinging rod assembly is of a single-rod structure, the pivotal axis can be set non-coaxially or co-axially. 
     
     
         7 . The structure defined in  claim 1 , wherein said treadmill further comprises two swinging connecting rods, with a jointing portion at the top and a swinging end at the bottom; the jointing portion is bolted onto the floorstand of the main framework; and both ends of the lateral shift rack are separately connected with the swinging ends of these two swinging connecting rods; the top of two swinging connecting rods is further extended to form an armrest.