SPEED REDUCER BOX FOR DRIVING A PUMP JACK

摘要

ABSTRACTAn improved light weight speed reducer box for driving an oilpump jack and reducing the speed from a drive motor or the like tothe pump jack. The speed reducer box includes reversible chain drivensprockets mounted on an input shaft, idle shaft, and output shaft, Bymounting the shafts between a separate upper and lower housing, main-tenance can be quickly performed on the speed reducer box.-1-