Lock nut

Claim 1

A LOCK NUT OF THE PREVAILING TORQUE-TYPE COMPRISING A NUT BODY OF RESILIENT MATERIAL HAVING A HEXAGONAL SHAPE TO PROVIDE SAID BODY WITH SIX SIDES FORMING THREE PAIRS OF OPPOSED VERTICAL FLATS, SAID NUT BODY HAVING A CENTRAL VERTICAL AXIS AND INCLUDING AN INTEGRAL UPPER PORTION FORMING AN OUT-OF-ROUND TRUNCATED CONE TAPERING CONTINUOUSLY UPWARDLY FROM SAID FLATS AT AN ANGLE OF APPROXIMATELY 45* RELATIVE TO SAID AXIS, SAID BODY HAVING A THREADED CENTRAL HOLE EXTENDING AXIALLY THROUGH THE BODY FROM TOP TO BOTTOM AND ADAPTED TO RECEIVE A MATING BOLT, SAID HOLE BEING CIRCULAR AT THE BOTTOM AND PARTLY DEFINING AT THE REDUCED UPPER END OF THE CONE AND OUT-ROUND ANNULAR SURFACE IN A PLANE NORMAL TO SAID AXIS, SAID ANNULAR SURFACE FORMING THE TOP OF THE NUT BODY AND BEING OF SUBSTANTIALLY UNIFORM DIMENSION AS MEASURED BETWEEN THE INNER AND OUTER EDGES OF THE ANNULAR SURFACE, SAID BODY HAVING AT THE BOTTOM AN ANNULAR BEARING FACE SURROUNDING THE HOLE IN A PLANE NORMAL TO THE NUT AXIS, THE HEIGHT OF THE NUT BODY AS MEASURED BETWEEN THE PLANE OF SAID UPPER END OF THE CONE AND SAID BEARING FACE BEING AT LEAST ABOUT 0.90D MINUS 0.015 INCH FOR NUT SIZES FROM 1/4" THROUGH 5/8" DIAMETER AND AT LEAST 0.88D MINUS 0.020 INCH FOR NUT SIZES FROM 3/4" TO 1/2" DIAMETER, WHERE D IS THE NOMINAL DIAMETER OF SAID MATING BOLT ION INCHES, THE OPPOSED VERTICAL FLATS OF ONE OF SAID PAIRS EACH HAVING AN INDENTATION EXTENDING CONTINUOUSLY ACROSS THE UPPER PORTION OF THE FLAT, THE LOWEST EXTENT OF SAID INDENTATION BEING SPACED BELOW THE PLANE OF SAID UPPER END OF THE CONE A DISTANCE EQUAL APPROXIMATELY TO ONE-THIRD OF SAID HEIGHT OF THE NUT BODY, SAID CONE AND THE THREADED HOLE PORTION WITHIN THE CONE HAVING IN CROSS-SECTION AND AT THE TOP THE SHAPE OF AN ELLIPSE WITH ITS MAJOR AXIS PARALLEL TO SAID INDENTED FLATS AND DISPOSED IN A VERTICAL PLANE INTERSECTING A PAIR OF OPPOSED VERTICAL CORNERS FORMED BY THE OTHER FLATS, THE MINOR AXIS OF SAID ELLIPSE BEING PERPENDICULAR TO SAID MAJOR AXIS, SAID CONE AND THE NUT BODY BETWEEN SAID INDENTATIONS DEFINING A THREADED HOLE WHICH IS OUT-OFROUND BY AN AMOUNT SUFFICIENT TO PROVIDE THE NUT WITH A FRICTION LOCKING TORQUE OF 115D2.4 TO 280D2.5, ON A MATING SCREW WITHIN THE DIMENSIONAL TOLERANCES OF ITS CLASS OF FIT, THE CONICAL SURFACE OF SID CONE EXTENDING FROM SAID REDUCED UPPER END TO SAID VERTICAL FLATS, THE MINIMUM HEIGHT OF THE CONE, AS MEASURED FROM THE PLANE OF ITS UPPER END TO THE HIGHEST POINTS OF THE FLATS, BEING AT LEAST ONE-THIRD OF SAID SPACING OF SAID LOWEST EXTENT OF SAID INDENTATION AND A COATING OF EXTREME PRESSURE LUBRICANT ON THE THREADS OF SAID HOLE AND SAID BEARING FACE.