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Claim 1

A SPROCKET WHEEL COMPRISING A HUB WHICH INCLUDES A RADIALLY OUTWARDLY PROJECTING PORTION, A CIRCULAR SEAT FORMED ON ONE SIDE OF THE HUB PORTION CONCENTRIC WITH THE AXIS OF THE HUB AND RADIALLY INWARD FROM THE PERIPHERY OF SAID PORTION, A TOOTHED RING UNIT HAVING A CENTRAL BORE ENGAGING SAID SEAT AND PROJECTING RADIALLY OUT FROM SAID HUB PORTION, AND MEANS REMOVABLY CONNECTING SAID RING UNIT TO THE HUB PORTION RADIALLY OUT FROM THE SEAT; THE RING UNIT COMPRISING A PAIR OF SEMI-CIRCULAR SECTIONS INITIALLY SEPARATE FROM EACH OTHER AND WHOSE RADIAL EDGES ABUT EACH OTHER, AND MEANS RELEASABLY CONNECTING SAID SECTIONS TOGETHER ADJACENT SAID RADIAL EDGES RADIALLY OUT FROM THE HUB PORTION, SAID MEANS HOLDING SAID SECTIONS AGAINST SEPARATION AND RELATIVE LATERAL DISPLACEMENT; THE LAST NAMED MEANS INCLUDING A BOLT PROJECTING THROUGH THE SECTIONS AND CENTERED AT THE RADIAL EDGES OF THE SECTIONS, A HEAD ON THE BOLT ENGAGING ONE FACE OF THE SECTIONS ON OPPOSITE SIDES OF THE LINE OF ABUTMENT THEREOF, A NUT ON THE BOLT SIMILARLY ENGAGING THE OPPOSITE FACE OF THE SECTIONS, AND A CIRCULAR FLANGE PROJECTING FROM THE SECTION-ENGAGING END OF THE HEAD RADIALLY OUT FROM AND CONCENTRIC WITH THE BOLT, SAID FLANGE HAVING ITS RADIALLY INNER SIDE TAPERED, AND THE ADJACENT FACE OF THE SECTIONS BEING FORMED WITH A CIRCULAR GROOVE OF A SIZE AND SHAPE TO RECEIVE AND COOPERATE WITH THE TAPERED FLANGE.