Патент USA US2128762код для вставки
Aug. 30, 1938. w. A. WEI-:D ' y GRINDING MACHINE Filed Aug. 17, 1957 4 „w „n im ï mi? m ä@ 2,128,762 2,128,762 it is turned upon the shaft, the short portion of the cam remaining out of engagement With the operating element when the inner unit is in~ verted and. turned upon the shaft, said short portion serving to guide the operating element back upon the long portion of the cam, means 3 to move the inner unit in an opposite direction to the movement eiîected by the cam, an outer unit for coaction with the inner unit, and means to draw the outer unit toward the inner unit. WALTER A. WEED.