(57) @ The sheave retention apparatus of the present invention includes a cap (34) that
fits over the end (30) of an axle (12) to retain a sheave (10) thereon. A bolt (36)
fastens the cap to the axle. Cap (34) is disk shaped with a shoulder (42) that fits
over end (30) of axle (12). When installed, bolt (36) passes through an off-center
hold (38) in the cap and into a corresponding off-center nut (40) welded to the inner
wall of the tubular axle. Rotation of cap (34) on axle (12) will bind the cap between
the bolt and the axle to prevent unthreading of the bolt. Additionally, to resist
unthreading under vibrational influences, a locking plate (62) that is clamped between
the hexagonal head (60) of the bolt and the outer surface of the cap. The locking
plate has two notched corners (68) and (70) that contact a portion of the cap to prevent
rotation of the locking plate with respect to the cap, and has two square comers (64)
and (66) that are bent up against the wrench flats of the bolt to prevent the bolt
from rotating with respect to the locking plate.
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