Abstract: To permit safe operation of clutch actuated moving ram machines, especially when the operator is to be permitted to "float" the ram, the operating linkage to the clutch is formed with a connection which requires input motion of the linkage in predetermined degree to actuate a safety mechanism. The purpose is to prevent ram operation until the operator is out of harm's way. The linkage is formed such that additional motion of the input elements to the clutch is ineffective to actuate the clutch until the safety apparatus is properly positioned whereupon such additional motion of the input member is made effective to actuate the clutch. An apparatus effective to perform according to that method comprises a piston and a cylinder capable of movement relative to one another and both capable of movement relative to a frame on which the clutch is mounted.