Directional control apparatus

Claim 1

IN COMBINATION WITH A SURFACING MACHINE HAVING A MOVABLE FRAMEWORK: FLUID OPERATED MEANS MOUNTED ON SAID FRAMEWORK ADAPTED, WHEN ACTIVATED, TO EFFECT CHANGES IN THE ORIENTATION OF THE FRAMEWORK RELATIVE TO THE MATERIAL BEING SURFACED; GUIDE MEANS FIXED RELATIVE TO THE MATERIAL BEING SURFACED; AIR OPERATED CONTROL MEANS ON SAID FRAMEWORK OPERATIVELY CONNECTED TO SAID FLUID OPERATED MEANS TO SELECTIVELY ACTIVATE SAID FLUID OPERATED MEANS; A SOURCE OF PRESSURIZED AIR; CONDUIT MEANS OPERATIVELY CONNECTED TO SAID SOURCE OF PRESSURIZED AIR AND TO SAID AIR OPERATED CONTROL MEANS WHEREBY SAID AIR OPERATED CONTROL MEANS IN SUBJECTED TO THE PRESSURE OF AIR SUPPLIED THERETO, SAID CONDUIT MEANS INCLUDING BRANCHED VARIABLE BLEEDER MEANS FIXEDLY MOUNTED ON SAID FRAMEWORK HAVING A MOVABLE ELEMENT IN CONTACT WITH SAID GUIDE MEANS, SAID BLEEDER MEANS BEING INTERPOSED IN SAID CONDUIT MEANS BETWEEN SAID AIR OPERATED CONTROL MEANS AND SAID SOURCE OF PRESSURIZED AIR, WHEREBY MOTION OF THE MOVABLE ELEMENT OF SAID BLEEDER MEANS DUE TO MOTION OF SAID FRAMEWORK RELATIVE TO SAID GUIDE MEANS WILL CAUSE A CORRESPONDING VARIANCE IN THE PRESSURE OF AIR DELIVERED FROM SAID SOURCE TO SAID AIR OPERATED CONTROL MEANS.