Patent ID: 8403800

Claim:
A shift mechanism for a planetary gear transmission comprising: a planetary gear transmission; a shift cam ( 600 ) engaged with a planetary gear assembly in the planetary gear transmission, the shift cam having a shift cam protrusion ( 5008 ); a rotatable cable carrier ( 5003 ) connected to a moveable cable ( 1 ), the cable carrier comprising a ramped portion ( 361 , 362 ); a rotatable ramped ring ( 5002 ), the ramped ring comprising a ramped portion ( 381 , 382 ) cooperatively engaged with the cable carrier ramped portion, and further the ramped ring having a protrusion ( 5009 ) cooperatively engagable with the shift cam protrusion ( 5008 ); a rotation of the cable carrier urging the ramped ring ( 5002 ) a predetermined distance in a direction normal to the plane of rotation of the cable carrier, the shift cam ( 600 ) held against rotation by engagement with the ramped ring ( 5002 ), and at which predetermined distance the ramped ring is allowed to rotate with the cable carrier ( 5003 ) simultaneous with the axial movement of the ramped ring ( 5002 ); and a spring ( 5005 ) connected between the cable carrier ( 5003 ) and the shift cam ( 600 ), the shift cam reacting to the spring force rotates upon rotation of the ramped ring ( 5002 ) by an amount of rotation that is limited by engagement of the shift cam protrusion ( 5008 ) with the ramped ring protrusion ( 5009 ) and during which rotation of the shift cam the transmission shifts gears.