Patent ID: 7775595

Claim:
A track drive mechanism, characterized by: a first track ( 112 ); a second track ( 114 ) offset from said first track ( 112 ); a first locking mechanism ( 120 ) adapted to engage said first track ( 112 ); a second locking mechanism ( 122 ) adapted to engage said second track ( 114 ); a latch release shaft ( 140 ) operatively connected to said first locking mechanism ( 120 ) and to said second locking mechanism ( 122 ); a latch bar ( 142 ) operatively connected to said latch release shaft ( 140 ); a hollow axle motor assembly ( 10 ) having a hollow axle ( 12 ) and a housing ( 22 ); a track drive shaft ( 160 ) operatively connected to said hollow axle ( 12 ), said track drive shaft ( 160 ) having an upper portion ( 162 ) and a lower portion ( 164 ); a first gear ( 170 ) adapted to engage said first track ( 112 ) and operatively connected to said upper portion ( 162 ) of said track drive shaft ( 160 ); a second gear ( 172 ) adapted to engage said second track ( 114 ) and operatively connected to said lower portion ( 164 ) of said track drive shaft ( 160 ); and a cam ( 150 ) operatively connected to said housing ( 22 ), said cam ( 150 ) adapted to engage said latch bar ( 142 ) such that, upon engagement of said hollow axle motor assembly ( 10 ) and rotation of said cam ( 150 ), said latch bar ( 142 ) rotates said latch release shaft ( 140 ) thereby releasing said first locking mechanism ( 120 ) and said second locking mechanism ( 122 ).