Line or pipe detector for earth moving machinery

Claim 1

FOR USE WITH A SUB-SURFACE PIPE LINE OF ELECTRICALLY CONDUCTING MATERIAL AND A SURFACE METER IN ELECTRICALLY CONDUCTING RELATION TO THE PIPE LINE, AN ENGINE-PROPELLED EARTH WORKING MACHINE CARRYING AN ELECTRICAL SYSTEM FOR THE VEHICLE INCLUDING A DIRECT CURRENT BATTERY, A RESERVOIR FOR HYDRAULIC FLUID AND A HYDRAULICALLY OPERATED EARTH WORKING IMPLEMENT MOVABLE RELATIVELY TO THE MACHINE AND CONTROLLED BY AN OPERATING BOX ON THE VEHICLE, A PIPE LINE DETECTOR AND IMPLEMENT DEACTIVATOR COMPRISING (A) AN ENGINE-DRIVEN PUMP, (B) A SUPPLY LINE FROM THE RESERVOIR TO THE PUMP, (C) A HYDRAULIC VALVE, (D) A PIPE LINE FROM THE PUMP TO THE VALVE, SAID VALVE HAVING (E) SELECTIVE MEANS FOR SUPPLYING THE PUMPED HYDRAULIC FLUID UNDER PRESSURE TO THE OPERATING BOX AND FOR RECYCLING THE PUMPED FLUID FROM THE VALVE BACK TO THE RESERVOIR, (F) A SOLENOID CONNECTED TO OPERATE THE VALVE HAVING (G) ONE TERMINAL CONNECTED TO SAID BATTERY, AND (H) AN ELECTRICAL LEAD FROM THE OTHER TERMINAL OF THE SOLENOID ADAPTED TO BE APPLIED TO THE SURFACE METER, (I) SO THAT WHEN THE EARTH WORKING IMPLEMENT CONTACTS THE SUB-SURFACE PIPE LINE CIRCUIT WILL BE CLOSED THROUGH ELECTRICALLY CONDUCTIVE SUB-SURFACE PIPE LINE, METER, SOLENOID AND BATTERY FOR SHIFTING THE VALVE FROM A POSITION ESTABLISHING HYDRAULIC FLUID CONNECTION BETWEEN THE PUMP AND OPERATING BOX TO A CLOSED HYDRAULIC CIRCUIT CONNECTION BETWEEN THE PUMP AND RESERVOIR FOR DEACTIVATING THE IMPLEMENT AND RECYCLING THE FLUID TO THE RESERVOIR.