Patent ID: 7328811

Claim:
A hoisting crane with an even reeving system comprising: a. a substantially hollow vertical column ( 21 ) comprising a foot ( 22 ), a top ( 23 ), and a body ( 19 ) disposed between the foot ( 22 ) and the top ( 23 ); b. an annular bearing structure ( 25 d ) disposed around the substantially hollow vertical column ( 21 ); c. a jib connection member ( 26 ) disposed on the annular bearing structure ( 25 d ) and rotatable about the substantially hollow vertical column ( 21 ); d. a jib ( 24 ) connected to the jib connection member ( 26 ); e. a first hoisting winch ( 62 ) disposed on a moveable winch support ( 50 ) connected to a first hoisting cable ( 66 ) and a second hoisting winch ( 64 ) disposed on the moveable winch support ( 50 ) connected to a second hoisting cable ( 68 ), wherein both hoisting cables pass through the interior of the substantially hollow vertical column ( 21 ) to a top cable guide ( 40 ) disposed on an annular bearing ( 94 ), and wherein the first hoisting cable ( 66 ) engages a first hoisting cable pulley assembly ( 63 ) connected to the left side of the top cable guide ( 40 ) and a second hoisting cable pulley assembly ( 65 ) connects to the right side of the top cable guide ( 40 ); f. wherein a third hoisting cable pulley assembly ( 200 ) is disposed on the left side of the jib ( 24 ) and a fourth hoisting cable pulley assembly ( 202 ) is disposed on the right side of the jib ( 24 ), wherein the third hoisting cable pulley assembly ( 200 ) comprises a second hoisting cable pulley ( 102 ) and wherein fourth hoisting cable pulley assembly ( 202 ) comprises a first hoisting cable pulley ( 101 ); g. wherein said first hoisting cable ( 66 ) extends diagonally to a first hoisting cable pulley ( 101 ), and wherein said second hoisting cable ( 68 ) extends diagonally to a second hoisting cable pulley ( 102 ); h. wherein a first hoisting cable crane hook pulley assembly ( 103 ) is connected to the crane hook block ( 110 ) for receiving the first hoisting cable ( 66 ) from the first hoisting cable crane hook pulley assembly ( 103 ) and a second hoisting crane hook cable pulley assembly ( 104 ) connected to the crane hook block ( 110 ) for receiving the second hoisting cable ( 68 ) from the second hoisting cable crane hook pulley assembly ( 104 ); i. wherein a first jib pulley assembly ( 105 ) is connected to the right side of the jib ( 24 ) and a second jib pulley assembly ( 106 ) is connected to the left side of the jib ( 24 ); and j. wherein the cables form a multiple cable fall arrangement between the first hoisting cable crane hook pulley assembly ( 103 ), the second hoisting cable crane hook pulley assembly ( 104 ) and the first jib pulley assembly ( 105 ) and the second jib pulley assembly ( 106 ) respectively.