Patent ID: 8439371

Claim:
An electric dolly system ( 100 ) for transporting an object up and down stairs ( 102 ), said system ( 100 ) comprising: (a) a dolly ( 110 ) comprising a base platform ( 112 ) connected to a bottom end of support rails ( 114 ), a handle ( 116 ) disposed at a top end of the support rails ( 114 ), and a pair of wheels ( 118 ) disposed at an intersection of the base platform ( 112 ) and the bottom end of the support rails ( 114 ); (b) a track belt ( 120 ) wrapped around a first rotator component ( 130 a ) and a second rotator component ( 130 b ), the track belt ( 120 ) is adapted to rotate around the rotator components ( 130 ) like a conveyor belt, the first rotator component ( 130 a ) is connected to the support rails ( 114 ) of the dolly ( 110 ) via a first extension arm ( 150 a ) and the second rotator component ( 130 b ) is connected to the support rails ( 114 ) of the dolly ( 110 ) via a stationary second extension arm ( 150 b ), a track tensioner is disposed on the second rotator component ( 130 b ) for adjusting the tension of the track belt ( 120 ), the first extension arm ( 150 a ) is positioned closer to the handle ( 116 ) than is the second extension arm ( 150 b ), the first extension arm ( 150 a ) is longer than the second extension arm ( 150 b ) such that the track belt ( 120 ) is at an angle with respect to the support rails ( 114 ) of the dolly ( 110 ), the first extension arm 150 a is foldably collapsible so as to move the first rotator component 130 a closer to the support rails 114 when not in use; and (c) a motor ( 160 ) operatively connected to the second rotator component ( 130 b ) via a chain ( 170 ); wherein when the motor ( 160 ) is activated the motor ( 160 ) causes rotation of the track belt ( 120 ) about the rotator components ( 130 ).