Cathodic protection alarm apparatus

Claim 1

IN CATHODIC PROTECTIVE APPARATUS FOR AN ELECTRICALLY CONDUCTIVE STRUCTURE POSITIONED IN AN ELECTROLYTE AND WHICH COMPRISES AN ELECTRODE POSITIONED IN SAID ELECTROLYTE IN THE VICINITY OF SAID STRUCTURE, THE COMBINATION OF: A METER RELAY CONNECTED ACROSS SAID ELECTRODE AND SAID STRUCTURE TO MEASURE THE VOLTAGE THEREBETWEEN; AN ELECTRIC SWITCH INCLUDED IN SAID METER RELAY IN POSITION TO BE ACTUATED WHEN SAID VOLTAGE FALLS BELOW A PARTICULAR VALUE; A SOURCE OF POTENTIAL; A SOLENOID; CIRCUIT MEANS CONNECTING SAID SOURCE OF POTENTIAL THROUGH SAID SWITCH TO SAID SOLENOID TO ENERGIZE SAID SOLENOID WHEN SAID SWITCH IS ACTUATED; A MECHANICAL ENERGY STORING UNIT INCLUDING A TRIP MECHANISM COUPLED TO SAID SOLENOID TO BE ACTUATED THEREBY WHEN SAID SOLENOID IS ENERGIZED; A MECHANICAL SIGNALING UNIT HAVING A STAND-BY POSITION AND A SIGNALING POSITION; SAID MECHANICAL SIGNALING UNIT COMPRISING A PIVOTALLY MOUNTED SEMAPHORE ARM, AND SAID MECHANICAL COUPLING MEANS INCLUDES SPRING LOADED LATCH MECHANISM COUPLED TO SAID STORING UNIT TO BE RELEASED THEREBY UPON THE ACTUATION OF SAID TRIP MECHANISM, AND CABLE MEANS CONNECTING SAID SPRING LOADED LATCH MECHANISM TO SAID SEMAPHORE ARM TO RELEASE SAID ARM UPON THE RELEASE OF SAID LATCH MECHANISM; AND MEANS MECHANICALLY COUPLING SAID SIGNALING UNIT TO SAID MECHANICAL ENERGY STORING UNIT TO CAUSE SAID SIGNALING UNIT TO BE ACTUATED FROM ITS STAND-BY POSITION TO ITS SIGNALING POSITION UPON THE ACTUATION OF SAID TRIP MECHANISM BY SAID SOLENOID.