Patent ID: 7108105

Claim:
A cable lift comprising: a single compartment or shaft ( 1 ) housing a movable cage ( 2 ) and apparatus ( 3 ) including at least one winch ( 4 ) with a cable fixed on a wall ( 16 ) in an upper space ( 1 a ) of the shaft ( 1 ) opposite a side wall of the cage ( 2 ) when the cage ( 2 ) is fully elevated in the shaft ( 1 ); wherein the upper space ( 1 a ) is occupied only by the apparatus ( 3 ) during operation of the movable cage ( 2 ); wherein the winch ( 4 ) has a traction pulley ( 4 c ) with an axis of rotation ( 4 a ) parallel to the wall ( 1 b ) on which the winch ( 4 ) is fixed and a traction pulley ( 4 c ) over which the cable travels and extends to travel around at least one drive pulley ( 5 a ) on a counterweight ( 5 ) for displacement of the cage ( 2 ); wherein the cable ( 6 ) has a first end ( 6 a ) fixed to the cage ( 2 ) and a second end ( 6 b ) fixed in the upper space ( 1 a ); wherein the counterweight ( 5 ) is always located below the cage ( 2 ) during ascent or descent of the cage ( 2 ); and wherein during any displacement of the cage ( 2 ), travel of the cable ( 6 ) around the drive pulley ( 5 a ) results in displacement of the counterweight ( 5 ) equal to substantially half the displacement of the cage ( 2 ).