Selectively controlled feeder

Claim 1

A SELECTIVELY CONTROLLED FEEDER COMPRISING A PLURALITY OF FEEDER UNITS, FEED RESERVOIR MEANS CONNECTED WITH EACH OF SAID FEEDER UNITS INCLUDING DISPENSING MEANS FOR DISPENSING FEED FROM SAID RESERVOIR MEANS INTO SAID FEEDER UNITS, SAID DISPENSING MEANS INCLUDING AN ACTUATOR FOR EACH OF SAID FEEDER UNITS, SAID ACTUATORS EACH HAVING A CONTROL MEANS OPERABLE REMOTE FROM SAID ACTUATORS, EACH OF SAID ACTUATORS COMPRISING A DOUBLE ACTING FLUID CYLINDER HAVING A PISTON THEREIN, A PAIR OF INLET LINES COMMUNICATING WITH OPPOSITE END PORTIONS OF SAID CYLINDER, SAID CONTROL MEANS EACH INCLUDING MEANS FOR ADMITTING FLUID UNDER PRESSURE TO BOTH OF SAID INLET LINES AND FIRST REMOTELY OPERABLE VENT MEANS COMMUNICATING SOLELY WITH ONE OF SAID LINES FOR TEMPORARILY VENTING SAID ONE LINE WHEREBY THE GREATER PRESSURE IN SAID OTHER LINE WILL OFFSET MOVEMENT OF THE PISTON IN ONE DIRECTION, AND SECOND VENT MEANS COMMUNICATING SOLELY WITH SAID OTHER LINE AND OPERABLE IN RESPONSE TO A PREDETERMINED MOVEMENT OF SAID PISTON IN SAID ONE DIRECTION FOR TEMPORARILY VENTING SAID OTHER LINE WHEREBY SAID PISTON WILL BE RETURNED TO ITS STARTING POSITION.