Multiple shaft diameter flexible coupling system

A system intended to provide flexible coupling of multiple diameter rotary shafts comprising:

• the provision of a coupling possessing a substantially cylindrical exterior surface and two straight, longitudinally uniform, bores each open to an opposed end, possessing a radially non-uniform feature resisting rotational displacement of an insert outer surface when in contact with the surface of one said bore, and each bounded by a wall possessing a substantially uniform thickness further possessing a longitudinal slot therethrough interrupting the circumferential extent of said wall and traversed by a threaded fastener associated with said bore;
• the provision of at least one radially compressible sleeve insert possessing;
• a straight, longitudinally uniform, insert outer surface possessing a radially non-uniform feature resisting rotational displacement of said insert outer surface when in contact with the surface of one said bore of said coupling, and a substantially cylindrical bore bounded by an insert wall possessing a substantially uniform wall thickness interrupted in circumferential extent by a circumferential gap, said radially non-uniform feature comprising one of the three following features:
• (1) a key extending radially outward from said insert outer surface fitting a key way extending into the surface of said bore of said coupling,
• (2) a flat extending into said insert outer surface, a congruent flat extending outward from said bore of said coupling and a key extending radially outward from said insert outer surface fitting a key way extending into the surface of said bore of said coupling,
• (3) six radially symmetrical flats extending into said insert outer surface and six congruent flats extending outward from said bore of said coupling;
• said insert outer surface being congruent to and fitting within either said bore of said coupling having said associated threaded fastener in a loose condition;
• whereby fitting said sleeve insert into one said bore of said coupling presents a reduced diameter bore comprised by said insert bore into which a rotary shaft of a reduced diameter with respect to the diameter of said bore of said coupling is readily fitted;
• whereby tightening of said threaded fastener associated with one said bore of said coupling provides radial compression providing engagement of a rotary shaft inserted into said bore possessing a full diameter with respect to the diameter of said bore;
• and
• whereby tightening of said threaded fastener associated with one said bore of said coupling having said sleeve insert fitted therein provides radial compression of said sleeve insert and provides engagement of a rotary shaft possessing a reduced diameter with respect to said full diameter.