Abstract: A crane includes a connector that supports a cab in such a manner that a position of the cab relative to a frame is changeable between an operation position and a transportation position. The connector has a lower swing arm attached to a lower arm attachment part below a first boom attachment part swingably about a swing axis located behind the first boom attachment part and an upper swing arm attached to an upper arm attachment part above the first boom attachment part swingably about the swing axis.

Abstract: A crane includes: a machine body; a tiltable body having a tiltable body proximal end supported on the machine body and being turnable in a tilting direction; a counterweight; a base weight having a placement surface that allows placement of the counterweight and being detachably attached to the machine body in either at least a front position or a rear position located behind the front position with the base weight projecting rearward further from the machine body than in the front position; and an auxiliary coupling member for coupling a portion of the base weight located in the rear position and the machine body to each other, the portion projecting rearward from the machine body.

Abstract: Provided is a weight capable of being easily attached to and detached from a load suspended-load rope. The weight is disposed to detect overwinding of a load suspended-load rope suspended from a derricking member of a construction machine. The weight includes a weight body, which has a cylindrical shape enclosing the load suspended-load rope, configured to be suspended from the derricking member through a string-like part. The weight body is formed with a rope insertion space that allows the load suspended-load rope to pass through the rope insertion space in the radius direction of the suspended-load rope. The rope insertion space includes an oblique slit part, which has a shape oblique to the center axis.

Abstract: Provided is an assembly method for a crane, by which method a crane including a strut can be assembled easily. The assembly method for the crane includes a strut coupling step of coupling a base end of a strut, a cylinder connecting step of extending a cylinder unit having one end supported by the strut, the cylinder unit being capable of extending/contracting, to connect the other end of the cylinder unit to the boom, a strut raising step of causing the cylinder unit to contract to raise the strut, and a strut supporting step of stretching a stretching member, such as a rear side guy line or a luffing cable, between a front end of the strut and a base end of the boom to support the strut in a raised state.

Abstract: Provided is an apparatus capable of preventing an auxiliary cylinder attached to a derricking member of a working machine from undesirable rotational movement. The apparatus includes an auxiliary cylinder capable of making expansion and contraction motions, an auxiliary-cylinder angle detector, a fixing device, and an expansion controller. The fixing device fixes the auxiliary cylinder to the derricking member when the expansion length of the auxiliary cylinder is in the fixing allowing range, and releases the fixing of the auxiliary cylinder at other times. The expansion controller judges the posture of the auxiliary cylinder based on the auxiliary-cylinder angle detected by the auxiliary-cylinder angle detector, allows the expansion and contraction motions when the auxiliary cylinder is in the vertical posture, and prohibits the auxiliary expansion and contraction motions when the auxiliary cylinder is in a posture other than the vertical posture and the auxiliary cylinder is fixed to the derricking member.

Abstract: A crane includes a crane main body, a boom, a jib, a boom driving unit, a jib driving unit, a manipulation unit, a drive control unit, a suspension device, a determination unit, and an operation regulating unit. The determination unit determines whether a jib boom angle condition is established or not. The operation regulating unit allows the crane to change a posture between a fall posture and a work posture according to a determination result of the determination unit.

Abstract: Provided is an apparatus capable of preventing an auxiliary cylinder attached to a derricking member of a working machine from undesirable rotational movement. The apparatus includes an auxiliary cylinder capable of making expansion and contraction motions, an auxiliary-cylinder angle detector, a fixing device, and an expansion controller. The fixing device fixes the auxiliary cylinder to the derricking member when the expansion length of the auxiliary cylinder is in the fixing allowing range, and releases the fixing of the auxiliary cylinder at other times. The expansion controller judges the posture of the auxiliary cylinder based on the auxiliary-cylinder angle detected by the auxiliary-cylinder angle detector, allows the expansion and contraction motions when the auxiliary cylinder is in the vertical posture, and prohibits the auxiliary expansion and contraction motions when the auxiliary cylinder is in a posture other than the vertical posture and the auxiliary cylinder is fixed to the derricking member.

Abstract: A crane includes a crane main body, a boom, a jib, a boom driving unit, a jib driving unit, a manipulation unit, a drive control unit, a suspension device, a determination unit, and an operation regulating unit. The determination unit determines whether a jib boom angle condition is established or not. The operation regulating unit allows the crane to change a posture between a fall posture and a work posture according to a determination result of the determination unit.

Abstract: It is aimed to enable an easier attachment of a lower spreader to a machine main body. The mast 30 is tiltably attached to the machine main body 13, and operable to lie over the machine main body 13. The lower spreader retainer 40 is fixedly attached to the machine main body 13, and adapted for retaining the lower spreader 50. The connector 60 connects the mast 30 and the lower spreader 50 with each other so that the mast 30 holds the lower spreader 50. The lower spreader 50 and the lower spreader retainer 40 are arranged at a position that allows the lower spreader retainer 40 to retain the lower spreader 50 in a state where the mast 30 holding the lower spreader 50 is lowered.

Abstract: It is aimed to enable an easier attachment of a lower spreader to a machine main body. The mast 30 is tiltably attached to the machine main body 13, and operable to lie over the machine main body 13. The lower spreader retainer 40 is fixedly attached to the machine main body 13, and adapted for retaining the lower spreader 50. The connector 60 connects the mast 30 and the lower spreader 50 with each other so that the mast 30 holds the lower spreader 50. The lower spreader 50 and the lower spreader retainer 40 are arranged at a position that allows the lower spreader retainer 40 to retain the lower spreader 50 in a state where the mast 30 holding the lower spreader 50 is lowered.