Rotary speed differential mechanism

Claim 1

IN A ROTARY SPEED DIFFERENTIAL MECHANISM FOR A VEHICLE GROUND WHEEL JOURNALED ON SHAFT, SAID SHAFT BEING FIXEDLY MOUNTED ON THE FRAME OF THE VEHICLE, A PLANETARY CARRIER INTEGRALLY MOUNTED ON THE WHEEL, A CIRCULAR DRIVE MEMBER JOURNALED ON THE SHAFT, SAID DRIVE MEMBER HAVING A TOOTHED PERIPHERY FOR ENGAGEMENT BY A DRIVE CHAIN LEADING FROM A POWER SOURCE, SAID DRIVE MEMBER HAVING A CENTRAL ANNULAR HUB JOURNALED ON THE SHAFT AND EXTENDING THEREALONG TOWARD THE CARRIER, AN ANNULAR RING MEMBER CONCENTRICALLY ENCIRCLING THE HUB INTERMEDIATE THE DRIVE MEMBER AND CARRIER, SAID HUB AND RING MEMBER RESPECTIVELY FIXEDLY CARRYING CONCENTRIC RADIALLY SPACED CONTINUOUS STRANDS OF ROLLER CHAIN, A TRIO OF PLANETARY GEARS OF EQUAL DIAMETER ROTATABLY MOUNTED ON THE PLANETARY CARRIER IN CIRCUMFERENTIALLY EQUALLY SPACED POSITIONS ABOUT THE SHAFT AND FOR ROTATION ON AXES PARALLEL TO THE SHAFT, SAID GEARS HAVING PERIPHERAL TEETH IN MESHING ENGAGEMENT WITH BOTH OF SAID STRANDS OF ROLLER CHAIN, A CATCH ON THE OUTER PERIPHERY OF THE RING MEMBER, A LOCKING DEVICE MOUNTED ON THE VEHICLE FRAME AND CARRYING A MOVABLE LATCH FOR SELECTIVE MOVEMENT BETWEEN AN ADVANCED POSITION IN ENGAGEMENT WITH SAID CATCH TO LOCK THE RING MEMBER TO THE FRAME AND A RETRACTED POSITION ALLOWNG ROTATIONAL MOVEMENT OF THE