Experimental shift bar of using

The utility model discloses an experimental shift bar of using, including upper boom subtotal lower beam part, upper boom part with the connecting portion of lower beam part are located between experimental shift bar of using's the penalty kick and head, upper boom part with the lower beam part is through threaded holes and threaded rod threaded connection, experimental shift bar of using's length accessible changes the threaded rod twists length adjustment in the screw hole. The utility model provides an experimental shift bar of using's the centre of sphere is apart from unchangeable, and the resistance arm of this shift bar is unchangeable promptly, only through changing the threaded rod twists length in the screw hole changes the power arm of shift bar, and then the lever that changes whole shift bar compares, avoids redesign, repaiies the molding and make new shift bar, not only can practice thrift the cost, can also shorten the time of definite lever ratio, simultaneously, can also realize the continuou