Permanent auto-jack

Claim 1

A JACK ASSEMBLY FOR RAISING AND LOWERING AN END OF A VEHICLE HAVING A CHASSIS FRAME, COMPRISING A PAIR OF JACK UNITS AND A GEAR HOUSING, MEANS FOR SECURING SAID UNITS AND HOUSING TO ONE END OF SAID FRAME IN HORIZONTALLY SPACED RELATIONSHIP WITH SAID HOUSING DISPOSED BETWEEN THE JACK UNITS, EACH OF SAID JACK UNITS COMPRISING A GENERALLY CYLINDRICAL CASING, A CYLINDRICAL HOLLOW MEMBER EXTENDING AXIALLY UPWARD FROM THE CASING, A PAIR OF AXIALLY VERTICAL HOLLOW SHAFTS TELESCOPICALLY DISPOSED ONE WITHIN THE OTHER IN SAID MEMBER, EACH OF SAID SHAFTS BEING EXTERNALLY THREADED FOR SUBSTANTIALLY THE FULL LENGTH THEREOF AND BEING INTERNALLY THREADED FOR ONLY A PART OF ITS LENGTH FROM ONE END THEREOF, A RING GEAR HAVING EXTERNAL TEETH AND AN INTERNAL HELICAL THREAD ROTATABLY DISPOSED IN THE CASING, A MITER GEAR ROTATABLY CARRIED BY THE CASING IN MESH WITH THE TEETH OF SAID RING GEAR, THE EXTERNAL THREAD OF THE OUTER ONE OF SAID SHAFTS BEING ENGAGED WITH THE INTERNAL THREAD OF THE RING GEAR, THE EXTERNAL THREAD OF THE INNER SHAFT BEING ENGAGED WITH THE INTERNAL THREAD OF THE OUTER SHAFT, A THIRD EXTERNALLY THREADED SHAFT AXIALLY DISPOSED INSIDE SAID INNER SHAFT AND ENGAGED WITH THE INTERNAL THREAD OF SAID INNER SHAFT, SAID THIRD SHAFT HAVING ONE END EXTENDING VERTICALLY OUTSIDE OF THE CASING, AND A HORIZONTAL BASE PLATE SECURED TO SAID END OF THE THIRD SHAFT; A GEAR MECHANISM IN SAID GEAR HOUSING, A CRANKSHAFT CONNECTED TO SAID GEAR MECHANISM FOR DRIVING THE SAME BY EXTERNALLY APPLIED MECHANICAL POWER, AND DRIVE SHAFT MEANS CONNECTING THE GEAR MECHANISM AND THE MITER GEAR IN EACH JACK UNIT, WHEREBY THE SHAFTS IN BOTH JACK UNITS ARE SIMULTANEOUSLY EXTENDED AND RETRACTED TO RAISE AND LOWER ONE END OF THE VEHICLE WHEN SAID CRANKSHAFT IS TURNED IN ONE DIRECTION AND ANOTHER DIRECTION RESPECTIVELY, A DEPENDING CYLINDRICAL EXTENSION ON SAID CASING, SAID EXTENSION HAVING A RECESS FORMED THEREIN, AND A LEAF SPRING IN SAID RECESS FRICTIONALLY ENGAGING THE OUTER ONE OF SAID SHAFTS TO PREVENT TURNING OF THE SAME WHILE THE RING GEAR IS TURNING TO MOVE SAID OUTER SHAFT AXIALLY.