![]() The crane according to claim 2, wherein the counterweight ( 12) is arranged movable along at least 50% of the length (L) of the boom ( 3), and preferably the counterweight ( 12) is arranged movable along at least 60% of the length (L) of the boom ( 3).ġ3. The crane according to claim 1, wherein the crane comprises a hoisting arrangement ( 10) connected to the front portion of the boom.ġ2. ![]() The crane according to claim 1, wherein the second transmission system ( 32) comprises an elongated second gear rack ( 40) attached to the boom ( 3) and extending in the longitudinal direction of the boom ( 3), and a second gear wheel ( 42) attached to the mast ( 2) and arranged to engage with the second gear rack ( 40), and a second motor ( 44) for driving the second gear wheel ( 42) so that the second gear wheel is moving along the second gear rack ( 40).ġ0. The crane according to claim 1, wherein the first transmission system ( 30) comprises: an elongated first gear rack ( 34) attached to the boom ( 3) and extending in the longitudinal direction of the boom ( 3), a first gear wheel ( 36) attached to the counterweight ( 12) and arranged to engage with the first gear rack ( 34), and a first motor ( 38) for driving the first gear wheel ( 36) so that the first gear wheel is moving along the first gear rack ( 34).ĩ. The crane according to claim 1, wherein the boom ( 3) comprises a framework ( 16) defining an elongated interior space ( 26) and the counterweight ( 12) is arranged movable inside said interior space ( 26).Ĩ. The crane according to claim 1, wherein the counterweight ( 12) is disposed inside the boom ( 3) and is arranged movable inside the boom ( 3).ħ. The crane according to claim 1, wherein the counterweight ( 12) is arranged movable to an outer end ( 9) of the rear portion ( 8).Ħ. The crane according to claim 1, wherein the mast ( 2) comprises a fixed part ( 21) and rotational part ( 22) arranged rotatable relative the fixed part ( 21) about an axis of rotation (R), the boom ( 3) is movably connected to the rotational part ( 22), and the counterweight ( 12) is arranged movable to a position on the front portion ( 6) located at least 1 m from said axis of rotation (R), preferably a distance of at least 2 m from said axis of rotation (R), and most preferably a distance of at least 3 m from said axis of rotation (R).ĥ. The crane according to claim 1, wherein the counterweight ( 12) is arranged movable along at least 50% of the length (L) of the boom ( 3), and preferably the counterweight ( 12) is arranged movable along at least 60% of the length (L) of the boom ( 3).Ĥ. ![]() The crane according to claim 1, wherein the counterweight ( 12) is arranged movable a first distance (D 1) with respect to the boom ( 3), the boom_( 4) is arranged linearly movable a second distance (D 2) with respect to the mast ( 2), and the first distance (D 1) is at least 30% longer than the second distance (D 2), preferably the first distance (D 1) is at least 50% longer than the second distance (D 2), and most preferably the first distance (D 1) is at least twice the second distance (D 2).ģ. A crane ( 1) comprising: a mast ( 2), an elongated boom ( 3) connected to the mast having a front portion ( 6) extending on one side of the mast and a rear portion ( 8) extending on the opposite side of the mast, and the boom ( 3) is linearly movable relative to the mast such that the length of the front portion and the length of the rear portion is adjustable by moving the boom relative to mast, a counterweight ( 12) movably connected to the boom ( 3), a first transmission system ( 30) for moving the counterweight ( 12) along the boom ( 3), and a second transmission system ( 32) for moving the boom ( 3) relative to the mast, wherein the first and second transmission systems ( 30, 32) are arranged to independently move the counterweight and the boom ( 3), and the counterweight and the boom are arranged so that the counterweight can pass the mast and move between the front portion ( 6) and the rear portion ( 8) independent of the position of the boom ( 3) with respect to the mast ( 2).Ģ. ![]()
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