Abstract: The invention relates to a crane, in particular a rotary tower crane, comprising a crane boom, from which a load hook can be raised and lowered via a hoist cable, and an electric power supply on the load hook and/or an optionally provided trolley which can be moved on the crane boom. According to the invention, the electric power is directly generated at the location where it is required, and in the process kinetic energy present at said location is converted into power. According to the invention, the electric power supply comprises a generator which is arranged on the load hook and/or on the trolley and which can be driven by a deflecting and/or running pulley and/or a cable running around the deflecting pulley.

Abstract: The present invention relates to a crane, in particular a deck crane, which comprises a boom which is erectable in its height about an axis of rotation, and an erecting trestle for deflecting a rope of a retracting mechanism in order to erect the boom. The invention is characterized in that the erecting trestle is erectable in its height, and the erecting trestle comprises a pull bar which includes a rotary joint in order to rotate a first portion of the pull bar with respect to a second portion of the pull bar.

Abstract: The present invention relates to a crane comprising a main boom and a rearwardly directed derrick boom for bracing the main boom, wherein a suspended ballast is directly or indirectly attached to the derrick head via connecting means, wherein at least one luffable, rearwardly aligned ballast adjusting boom is provided, which acts on the connecting means and influences the suspended ballast radius by its luffing angle.

Abstract: A self-erecting crane including a mast mounted on a rotating platform and supporting a boom is configurable between a transport configuration and a working configuration. The mast supports a hitch element suitable for being coupled on a fifth wheel provided on a rear platform of a tractor truck, the hitch element being located in a front hitch area of the mast which is dimensioned to come above the rear platform. The self-erecting crane also includes a mooring system located on the front hitch area and a removable ballasting element. In the transport configuration, the removable ballasting element is configured to be temporarily moored on the mast by the mooring system so that the removable ballasting element is located under the mast in the front hitch area. In the working configuration, the removable ballasting element is mounted on the rotating platform.

Abstract: A tower crane includes a tower on which a rotating portion is pivotally mounted and configurable between a service configuration in which the rotating portion can be rotatably driven by a motorized orientation system, and an out of service configuration in which the rotating portion is rotatably released to be able to be oriented in the direction of the wind. A control/command unit activates a monitoring mode in the out of service configuration to detect, depending on variations in the angle of orientation or the angular speed of the rotating portion, if the rotating portion is in one of the following movement states: an autorotation state corresponding to a rotary movement of the rotating portion in a given direction over at least one complete turn; or an oscillation state corresponding to a back and forth movement of the rotating portion about the orientation axis.

Abstract: The present disclosure relates to a lattice piece for a lattice boom having four corner bars that are connected to one another by a plurality of posts and diagonals, wherein the lattice piece has a rectangular cross-section having two longer and two shorter sides. A cross-sectional section of the corner bars is designed as a hollow section that has a larger extent in the direction of the longer side of the lattice piece than in the direction of the shorter side of the lattice piece. At least one side of the corner bar section has a stabilization structure in the form of a joint, a kink, a bend, or a rounded portion. The present disclosure further relates to a lattice boom comprising at least one lattice piece in accordance with the present disclosure and to a work machine having such a lattice boom.

Abstract: Telescopic lattice type crane boom for a crane, further comprising a locking system configured to lock at least one telescopic boom section with respect to a base boom section in at least an extended position, wherein said locking system includes a plurality of pins, each pin being configured to extend, in at least the extended position of the boom, at least partly through a corresponding pin receiving aperture provided in one of the base boom section and the at least one telescopic boom section.

Abstract: This crane is provided with: a boom; a wire rope suspended down from a leading end section of the boom; a suspender that is fixed to a lower end of the wire rope and is for suspending a slinging tool for hanging a load; a calculation unit that calculates a first load, which is the weight of a member that is suspended down from the suspender; a slinging tool database unit that stores information pertaining to the slinging tool corresponding to the first load; a determination unit that determines whether a load is being suspended from the suspender; and a control unit that acquires the information pertaining to the slinging tool corresponding to the first load from the slinging tool database unit if the load is being suspended, and sets the vertical length of the slinging tool on the basis of the acquired information pertaining to the slinging tool.

Abstract: A bicycle sprocket arrangement comprises a smaller sprocket and a larger sprocket. The larger sprocket has at least one upshifting facilitation area configured to facilitate an upshifting operation in which a bicycle chain is shifted from the larger sprocket toward the smaller sprocket. The at least one upshifting facilitation area includes an upstream tooth, an intermediate tooth, and a downstream tooth. The upstream tooth has a first recessed portion. The intermediate tooth has a second recessed portion. The downstream tooth has at least one of a third recessed portion and a chamfered portion. The at least one of the third recessed portion and the chamfered portion are separated from the second recessed portion.

Abstract: Provided is a crane that is capable of effectively suppressing oscillation related to the pendulum resonance frequency generated in a suspended load on the basis of the suspended length of a wire rope. The crane 1 calculates a suspended load oscillation resonance frequency ?x(n) determined on the basis of the suspended length L(n) of a wire rope (14·16), and generates a control signal C(n) for an actuator according to an arbitrarily defined operation signal, and, on the basis of the resonance frequency ?x(n), generates from the control signal C(n) a filtering control signal Cd(n) for the actuator in which a frequency component in an arbitrarily defined frequency range is attenuated by an arbitrarily defined percentage. The frequency range of the attenuated frequency component and/or the percentage of attenuation is altered on the basis of the suspended length L(n) of the wire rope (14·16).

Abstract: The present apparatus relates to an apparatus for the guying of a lattice boom of a crane, in particular of a mobile crane, comprising a frame and two connection elements connected thereto, wherein the frame has first attachment means for a releasable connection of the apparatus to a guying of the crane and wherein the connection elements have two attachment means for a releasable fastening of the apparatus to the boom. In accordance with the invention, the apparatus can be assembled at the boom for assembly thereat and can be removed again after the boom has been assembled. The present invention further relates to a respective method for the in the air assembly and for the restoring to the original state and the guying of a lattice boom by means of the apparatus in accordance with the invention.

Abstract: There is provided a control system including: a first transmission unit configured to transmit a first command directing an operation of a crane; a second transmission unit configured to transmit a second command directing an operation of the crane; and a control device including a first reception unit configured to accept the first command and a second reception unit configured to accept the second command, in which the control device is configured to operate the crane in a case in which the first command and the second command coincide with each other.

Abstract: A hoists remote-control assembly having an electrical hoist assembly with a combined control signal and electrical input port, a hoist trolley assembly having a control input port and a combined control signal and electrical cable having a free end extending from the hoist trolley assembly with the free end of the control signal and electrical cable removably attachable to the power input port of the hoist assembly, a wireless signal receiver module having a control signal cable removably attachable to the control signal input port of the hoist trolley assembly, a power input port removably attachable to the control signal and electrical cable of the hoist trolley assembly, and a combined control signal and electrical cable removably attachable to the power input port of the hoist assembly, and a wireless transmitter sending wireless operator hoist commands to the wireless signal receiver module located distal to the wireless transmitter.

Abstract: To provide a crane capable of stably traveling a transporter capable of supporting a counterweight in cooperation with slewing of an upper slewing body. The crane has a connecting body connecting the self-propelled transporter and the upper traveling body, a transporter angle detecting unit, and a steering angle setting unit. A transporter connecting portion of the connecting body is rotatably connected to the self-propelled transporter about a rotation center axis, and moves relative to a slewing body connecting portion whereby the relative distance between the self-propelled transporter and the upper slewing body is variable. The steering angle setting unit sets the steering angle of the wheels of the self-propelled transporter according to the transporter angle detected by the transporter angle detecting unit so that the transporter angle approaches 90 degrees.

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 seal chain includes two inner link plates opposed to and spaced apart from each other, a tubular bushing, opposite ends of the bushing being respectively joined to the two inner link plates, a pin rotationally inserted into the bushing, a tubular roller into which the bushing is inserted, the roller being rotationally supported by the bushing, and two outer link plates arranged to externally hold the two inner link plates in between, opposite ends of the pin being respectively joined to the two outer link plates. A recess into which an end of the roller is inserted is formed in an inner surface of each of the inner link plates.

Abstract: A bicycle sprocket having a rotational center axis, the bicycle sprocket comprises a sprocket body, a chain engagement structure, and a shifting facilitation projection. The chain engagement structure is arranged on a radially outer periphery of the sprocket body. The chain engagement structure includes a plurality of chain-driving teeth to engage with a bicycle chain to transmit a rotational driving force to the bicycle chain. The shifting facilitation projection is to facilitate an upshifting operation of the bicycle chain and to facilitate a downshifting operation of the bicycle chain.

Abstract: Hoists, platforms and davits are described as well as methods of securing same to telecommunication and other towers. The hoists, platforms and davits may be secured to the towers on a temporary basis using clamps. The clamps may include brackets and cables. The cables may be attached to the brackets, may wrap around the outer surface/perimeter of the tower pole/leg and may use tension to keep the bracket in place.

Abstract: The disclosure provides a bicycle front derailleur including a fixed component, a chain guide, a first link, a second link, and a driving assembly. Two opposite ends of the first link are respectively disposed on the fixed component and the chain guide. The two opposite ends of the second link are respectively disposed on the fixed component and the chain guide. The driving assembly includes a driving shaft, a push component, an output gear and a power source. The push component and the output gear are fixed on the driving shaft, the power source is disposed on the fixed component and connected to the output gear, the push component is in contact with the first link, and the power source is configured to drive the push component to pivot the first link with respect to the fixed component via the output gear and the driving shaft.

Abstract: There is provided a crane including a main body, a tower derrickably supported by the main body, a jib derrickably supported by the tower, an assist member that assist the jib to move along a ground, and a determination unit that determines whether or not the jib is stopped when the tower is lowered in a lowering work state where the jib is assisted by the assist member.