Control apparatus for borehole instruments

Claim 1

A CONTROL APPARATUS FOR BOREHOLE INSTRUMENTS INCLUDING: A HOUSING HAVING A CAVITY THEREIN, SAID HOUSING HAVING AN UPPER END ADAPTED FOR DEPENDENT COUPLING TO A BOREHOLE INSTRUMENT AND A LOWER END DEFINING A BORE EXTENDING LONGITUDINALLY BETWEEN SAID CAVITY AND THE EXTERIOR OF SAID HOUSING; ELECTRICAL SWITCH MEANS DISPOSED IN SAID CAVITY, SAID SWITCH MEANS BEING ADAPTED FOR ELECTRICAL CONNECTION IN AN ELECTRICAL CIRCUIT FOR CONTROLLING THE OPERATION OF SUCH ELECTRICAL CIRCUIT; AN ELONGATED PLUNGER SLIDABLY RECEIVED IN SAID BORE FOR TRAVEL BETWEEN LONGITUDINALLY-SPACED POSITIONS RELATIVE TO SAID HOUSING, SAID PLUNGER HAVING AN INNER END EXTENDING INTO SAID CAVITY AND AN OUTER END EXTENDING OUTWARDLY FROM SAID LOWER HOUSING END, SAID OUTER END BEING SO ARRANGED WHERE ENGAGEMENT WITH A BOREHOLE OBSTRUCTION FORCES SAID PLUNGER INWARDLY INTO SAID CAVITY, SAID INNER END BEING OPERATIVELY POSITIONED RELATIVE TO SAID SWITCH MEANS FOR OPERATING SAID SWITCH MEANS AT ONE OF SAID POSITIONED OF SAID PLUNGER; RESILIENT BIASING MEANS FOR NORMALLY BIASING SAID PLUNGER TOWARD THE OTHER OF SAID POSITIONS; STOP MEANS FOR LIMITING TRAVEL OF SAID PLUNGER TO SAID OTHER POSITION; AN ELONGATED ARM MEANS DISPOSED LENGTHWISE OF SAID HOUSING WITH THE LONGITUDINAL AXIS OF SAID ARM MEANS IN A PLANE INCLUDING THE LONGITUDINAL AXIS OF SAID HOUSING, SAID ARM MEANS HAVING A FIRST AND SECOND END MOVABLY CONNECTED TO SAID HOUSING, SAID MOVABLY-CONNECTED ENDS BEING ARRANGED SO THAT SAID ENDS CAN BE DISPOSED IN AN EXTENDED FIRST POSITION RELATIVE TO ONE ANOTHER TO PLACE SAID ARM MEANS ALONG SAID HOUSING AND IN A CONTRACTED SECOND POSITION RELATIVE TO ONE ANOTHER TO PROJECT SAID ARM MEANS OUTWARDLY FROM SAID HOUSING; MEANS ON SAID HOUSING RELEASABLY HOLDING SAID FIRST AND SECOND ENDS IN SAID FIRST POSITION; AND MEANS IN SAID HOUSING RESPONSIVE TO TRAVEL OF SAID PLUNGER TO SAID ONE POSITION FOR RELEASING SAID HOLDING MEANS, SAID MOVEMENT-RESPONSIVE MEANS INCLUDING AT LEAST TWO SLIDABLE ROD MEMBERS TANDEMLY DISPOSED BETWEEN SAID PLUNGER AND SAID HOLDING MEANS FOR TRAVEL BETWEEN LONGITUDINALLY-SPACED POSITIONS RELATIVE TO SAID HOUSING, AND AT LEAST ONE SLIDABLE MEMBER INTERMEDIATE SAID ROD MEMBERS AND OPERATIVELY DISPOSED THEREBETWEEN SO THAT LONGITUDINAL TRAVEL OF ONE ROD WILL BE TRANSLATED THROUGH SAID SLIDABLE MEMBER INTO AN EQUIVALENT LONGITUDINAL TRAVEL OF THE OTHER OF SAID RODS.