Fasteners having toothed bearing surfaces

Claim 1

IN A THREADED FASTENER, THE COMBINATION COMPRISING A FLAT SIDED BODY OF A REGULAR POLYGONAL SECTION IN A DIRECTION NORMAL TO A CENTRAL AXIS AND HAVING OPPOSED END SURFACES, ONE OF SAID END SURFACES HAVING THE GENERAL FORM OF A CONICAL FRUSTUM AND HAVING TEETH INTEGRALLY FORMED THEREON, SAID TEETH EXTENDING ACROSS SAID ONE OF THE END SURFACES IN DIRECTIONS TO FORM ACUTE ANGLES WITH RADII INTERSECTING THE TEETH AT THE OUTER ENDS THEREOF AND BEING OF SUBSTANTIALLY UNIFORM DEPTH AND CONTOUR, EACH OF SAID TEETH HAVING A SURFACE AND AN EDGE INTERSECTING IN APPROXIMATELY RIGHT ANGULAR RELATIONSHIP, AND SAID SURFACES OF THE TEETH PRESENTING RELATIVELY GRADUAL SLOPES FACING IN THE DIRECTION OF ROTATION FOR TIGHTENING THE FASTENER, WHEREBY THE SLOPES OF SAID EDGES FACING IN THE OPPOSITE DIRECTION PRESENT ABRUPT SLOPES IN THE LATTER DIRECTION, SAID EDGES OF THE TEETH BEING CONCAVELY CURVED IN THE DIRECTION TOWARD WHICH THE FASTENER IS TURNED FOR EFFECTING THE LOOSENING THEREOF AND BEING DISPOSED WITH ALL INCREMENTS OF THE CONCAVE SURFACES FACING OUTWARDLY FROM THE AXIS OF THE FASTENER, AND SAID EDGES OF THE TEETH HAVING THE CURVATURE OF THE ARCS OF CIRCLES HAVING CENTERS LOCATED AHEAD OF SAID EDGES IN THE DIRECTION OF TURNING OF THE FASTENER FOR LOOSENING AND IN A CIRCULAR ORBIT CONCENTRIC TO SAID CENTRAL AXIS AND HAING A DIAMETER GREATER THAN THE OUTSIDE DIMENSION OF SAID BODY IN A DIRECTION LATERAL TO THE AXIS, AND SAID CIRCLES HAVING RADII OF A LENGTH TO CROSS SAID CONICAL FRUSTUM AND THE THREADS OF THE FASTENER AND BEING TANGENT TO A CIRCLE WHICH IS CONCENTRIC TO SAID CENTRAL AXIS AND WHICH LIES ENTIRELY WITHIN THE FLAT SIDE OF THE POLYGONAL BODY.