Electrical control circuits for borehole apparatus

Claim 1

A DOWNHOLE SWITCHING DEVICE FOR A WELL TOOL COMPRISING: A HOUSING INCLUDING RELATIVELY MOVABLE MEMBERS WHICH CAN BE MOVED BETWEEN AT LEAST TWO POSITIONS; FIRST AND SECOND CIRCUIT MEANS IN SAID HOUSING, SAID FIRST CIRCUIT MEANS CONTROLLING THE OPERATION OF SECOND CIRCUIT MEANS, SAID FIRST CIRCUIT MEANS INCLUDING A FIRST SWITCH MEANS; SECOND SWITCH MEANS ARRANGED FOR ACTUATION IN RESPONSE TO POSITIONING OF SAID MEMBERS IN ONE OF SAID POSITIONS; MEANS RESPONSIVE TO ACTUATION OF SAID SECOND SWITCH MEANS FOR PERIODICALLY ACTUATING SAID FIRST SWITCH MEANS IN A PREDETERMINED TIMED SEQUENCE; CHANNEL MEANS COUPLED TO SAID FIRST AND SECOND SWITCH MEANS AND RESPONSIVE TO A PREDETERMINED TIME SEQUENCE OF ACTUATION OF SAID FIRST AND SECOND SWITCH MEANS FOR CONTROLLING THE OPERATION OF SAID SECOND CIRCUIT MEANS, SAID CHANNEL MEANS INCLUDING PARALLEL ELECTRICAL PATHS; A THIRD SWITCH MEANS FOR COUPLING ONE OR THE OTHER OF SAID PATHS TO SAID FIRST SWITCH MEANS, SAID THIRD SWITCH MEANS BEING RESPONSIVE TO SAID SECOND SWITCH MEANS; AND RESET SWITCH MEANS COUPLED TO SAID ELECTRICAL PATHS AND RESPONSIVE TO CHANGES FROM SAID PREDETERMINED TIMED SEQUENCE FOR DEACTUATION OF SAID PERIODICALLYACTUATED SWITCH MEANS.