Remote control for rock drill

Claim 1

A CONTROL SYSTEM FOR A ROCK DRILL AND FEED ASSEMBLY INCLUDING A DRILL FEED MOUNTING, A ROCK DRILL SUPPORTED ON SAID MOUNTING FOR RECIPROCATING MOVEMENT AND HAVING A FLUID ACTUATED DRILL MOTOR, AND A REVERSIBLE FLUID ACTUATED FEED MOTOR FOR MOVING SAID DRILL ALONG SAID MOUNTING, CHARACTERIZED BY: A MAIN VALVE COMPRISING A HOUSING, DEFINING A VALVE CHAMBER, AND A VALVE MEMBER DISPOSED IN SAID CHAMBER; SAID HOUSING HAVING PORTS OPENING INTO SAID CHAMBER INCLUDING A SUPPLY PORT FOR COMMUNICATION WITH A SOURCE OF PRESSURE FLUID, A MOTOR PORT FOR COMMUNICATION WITH SAID DRILL MOTOR, A FEED FOR PORT FOR COMMUNICATION WITH ONE SIDE OF SAID FEED MOTOR, AND A RETRACT PORT FOR COMMUNICATION WITH THE OTHER SIDE OF SAID FEED MOTOR; MEANS PROJECTING FROM SAID HOUSING FOR MANUALLY ACTUATING SAID VALVE MEMBER; MEANS URGING SAID VALVE MEMBER TO A FIRST POSITION WHEREIN SAID VALVE MEMBER COMMUNICATES SAID SUPPLY PORT WITH SAID RETRACT PORT TO EFFECT RETRACTION OF SAID DRILL ALONG SAID MOUNTING; SAID VALVE MEMBER BEING MOVABLE TO A SECOND POSITION WHEREIN SAID VALVE MEMBER COMMUNICATES SAID SUPPLY PORT WITH SAID MOTOR PORT TO ACTUATE SAID DRILL MOTOR, AND WITH SAID FEED PORT TO EFFECT FEED OF THE DRILL ALONG SAID HOUSING; MEANS FOR DIRECTING PRESSURE FLUID TO SAID VALVE CHAMBER TO HOLD SAID VALVE IN SAID SECOND POSITION; AN AUXILIARY VALVE COMMUNICATING WITH SAID MAIN VALVE CHAMBER AND MOUNTED TO BE ACTUATED IN RESPONSE TO PREDETERMINED FEED MOVEMENT OF SAID DRILL ALONG SAID MOUNTING; SAID AUXILIARY VALVE, WHEN ACTUATED, VENTING SAID MAIN VALVE CHAMBER TO EFFECT THE SHIFTING OF SAID MAIN VALVE MEMBER TO SAID FIRST POSITION.