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FOUR-SPEED GEARBOX MECHANISM WITH CLUTCHES ON THE INPUT AND OUTPUT SHAFTS

Clutches 3 and 4 slide along square guides a and b of input and output shafts 1 and 2. Gears 9, 10, 11 and 12 are keyed to intermediate shaft 13 and are in constant engagement with gears 5, 7, 6 and 8 which rotate freely on shafts 1 and 2. When driving shaft 1 rotates, driven shaft 2 can have any one of four speeds for which clutches 3 and 4 are engaged at the same time to gears 5 and 7, or gears …