Abstract: An automated collapsible tower crane comprising a mast with telescopic portions, a boom with boom sections articulated with each other by respective rotary joints, a boom folding system to unfold and fold the boom by the rotary joints wherein each proximal and distal rotary joint is associated with at least one hydraulic actuator to unfold and fold boom sections, a mast folding system to fold the mast down, wherein in the transport position the boom sections are folded down one on top of the other and on the mast, and the boom folding and unfolding system acts independently of the folding and telescoping system of the mast, and comprises hydraulic actuators to fold and unfold the boom sections.

Abstract: A crane apparatus with an integrated assembly for overcoming each dead position between primary and secondary parts of its operational arm includes a bearing framework attached to a chassis and is furnished with at least two telescopic supporting legs that are vertically arranged, and a bearing mast that is connected with the bearing framework, and an operational arm is attached in a pivot point and pivotable around a horizontal axis. The operational arm includes a primary part and a secondary part that are pivotally connected with each other. The secondary part is pivotal around the horizontal axis connected with the primary part of the operational arm via a dead position overcoming assembly that includes a rotational driving subsystem as well as a mechanism that is attached to part of a hydraulic cylinder for pivoting relative to the secondary part of the operational arm.

Abstract: A roller transport assembly includes a cart assembly and a roller carriage assembly. The roller carriage assembly is slidably mounted to the cart assembly and has at least one chamber for housing a roller. Each of the chambers includes a linear rail extending along a first axis and a roller coupling device attached to and slidable along the linear rail. The roller coupling device is operable to couple to the roller and move the roller along the first axis adjacent and parallel with the linear rail.

Abstract: An automated rig apparatus for drilling or servicing a well is provided. The apparatus can include a motor vehicle having a frame, and a hinged derrick mast pivotally attached to the frame. The apparatus can further include a rack disposed in the mast and a carriage assembly with pinion motors configured to travel up and down the rack when the mast is raised to a vertical position. A tool carrier configured to receive a top drive unit or a power swivel unit can be attached to the carriage assembly. The apparatus can further include a movable platform and an operators cab configured to be moved to a desired position relative to the derrick mast when the mast is raised to a vertical position. The apparatus can further include a hydraulic drive assembly to operate the apparatus, and a mud pump and manifold for pumping drilling mud.

Abstract: A lifting device for lifting shipping containers has an end frame configured to engage with a shipping container. An extension member is rotatably connected to the end frame at a rearward upper pivot point. A support frame is rotatably affixed to the end frame at a rearward lower pivot point. The support frame is further rotatably affixed to the extension member at a forward upper pivot point. Extension of the extension member rotates the support frame with respect to the end plate, causing the support frame to move the end plate upwards, the end plate then lifting the shipping container. A roller wheel is affixed to the support frame and allows the shipping container to be rolled on a surface when multiple devices are used to lift the shipping container off of the surface.

Abstract: In some embodiments, systems, apparatuses and methods are provided to enhance delivery of packages. Some embodiments provide an unmanned delivery system comprising: a rotational drive shaft; a crane motor cooperated with the drive shaft that is rotated by the crane motor; a first crane system with a first cord fixed with the first crane system, wherein the first crane system is configured to cooperate with the drive shaft to control the first crane system in controlling the spooling and retraction of the first cord; a control circuit coupled with the crane motor; and a stop switch electrically coupled with the control circuit and positioned to be contacted by a package release hanger secured with the first cord when the first cord is retracted to a first threshold; wherein the control circuit is configured to stop the crane motor in response to receiving a signal from the stop switch.

Abstract: The general field of this invention is electrical connectors and their actuating mechanism. More specifically, this invention teaches a novel connector and its actuating mechanism for establishing an electrical connection between two arbitrarily oriented objects such as an arbitrarily parked EV and infrastructure. In most of the prior art, a conductive connection requires precise and guided alignment of mating conductors. The prior art achieves this either by a sensor guided search or mechanical guides to being the two objects into desired alignment. In order to tolerate a wider misalignment between the two objects, the guides have to have a large footprint. In contrast, this invention breaks down the process of aligning the two halves of connector into a series of simple motions—when carried out in a particular order, would deliver the necessary alignment of the two sides of a connector.

Abstract: The invention relates to bridge crane assembly and a method for installation of a bridge crane. The invention is especially applicable for use in service and repair of vehicles and other heavy equipment in field conditions, such as crisis areas. The bridge crane assembly is supported by two containers (91, 92), upon which there are support frames (10, 20). The support frames are fixed to the top corners of the containers with twistlocks (19a-19d, 29a-29d), and the support frames support a crane bridge (30) with a hoist (40).

Abstract: A crane assembly includes a main body, a boom extending from the main body, a cable, and a hook coupled to an end of the boom opposite to the main body by the cable, where the crane assembly is configured for lifting items via the hook. The crane assembly further includes a projection extending outward from the boom and curving toward the main body. The projection is configured to receive the hook over an end of the projection such that tension in the cable maintains the hook in place on the projection. Gravity is sufficient to release the hook from the projection when the boom is raised and the tension in the cable is released.

Abstract: A system for extraction of a pool cleaning robot from a pool, the system may include a pool cleaning robot interface that is arranged to be coupled to a pool cleaning robot during an exit process during which the pool cleaning robot is extracted from the pool; and a pool cleaning robot manipulator that is coupled to the pool cleaning robot interface, wherein the pool cleaning robot manipulator is arranged to move the pool cleaning robot interface between a first and second portion; wherein when the pool cleaning robot interface is at the first position and is coupled to the pool cleaning robot, the pool cleaning robot is within the pool; wherein when the pool cleaning robot interface is at the second position and is coupled to the pool cleaning robot, the pool cleaning robot is positioned outside the pool.

Abstract: A portable lifting system includes a moveable base component including a scissors lift assembly, and a crane assembly coupled the movable base component, the crane assembly including a support member and a boom coupled to the support member.

Abstract: The present disclosure relates to a mobile revolving tower crane with a crane tower consisting of individual lattice pieces and with a main arm that is articulated in a rockable manner to the tower via a rocking mechanism, or with a rockable tip, wherein the crane tower comprises a climbing device.

Abstract: A mobile telescopic crane has a telescopic jib with at least three part-jibs. Each of the part-jibs is constructed from at least two part-jib portions so as to be telescopic in a longitudinal direction. Part-jib portions arranged at a spacing from one another transverse to the longitudinal direction each form a jib portion with at least one flexurally rigid connecting element. Respective adjacent jib portions are mechanically lockable with respect to one another in the longitudinal direction. A construction of this type of the jib means that an increase in the bearing load is easily achieved by increasing the area moment of inertia of the jib.

Abstract: Hoisting crane (20), comprising a substantially hollow jib (24,-124; 324) having a longitudinal axis, and comprising one or more hoisting cable guides (47, 48, 49; 147; 347). The jib comprises at least one jib leg (29; 129; 329) extending between a jib connection member (26) and a jib hoisting end (27; 127; 327), wherein the at least one jib leg comprises one or more hybrid portions (160; 360) comprising two elongated hollow casings (170; 370) substantially parallel to each other and substantially parallel to the longitudinal axis of the jib, and wherein between the two casings a truss (171 371) is provided to rigidly connect the two castings.

Abstract: Embodiments of the invention generally relate a method and apparatus for a tower structure. In one embodiment, the tower structure comprises a first base plate comprising a first hinge device, a first structural section having a first side and a second side, the first structural section coupled to a second base plate comprising a second hinge device, a second structural section coupled to the first structural section, and an aerial component coupled to the second structural section, wherein the first structural section is rotatable relative to the first base plate in a first rotational axis, the second structural section is rotatable relative to the first structural section in a second rotational axis, and at least a portion of the second structural section is received in a channel formed in the first side of the first structural section when the first structural section and the second structural section are substantially parallel.

Abstract: A vehicle crane—in particular an articulated-arm crane—includes a lifting arm and one or more articulated arms, and the geometry of the crane arms can be changed with respect to one another. A load cable can be guided or is guided on the crane arms. A compensation device allows the tension in the load cable to be controlled or regulated upon a change in the geometry of the crane arms with respect to one another.

Abstract: A crane includes: a boom; a jib that is provided on a leading end side of the boom; and a strut that is provided at one or both of a leading end portion of the boom and a base end portion of the jib, and to which a jib support pendant is connected, the strut, to which the pendant is connected, being provided with strut rotationally moving means having: a first bar-like member rotationally connected, at a first end portion thereof on one side, to a leading end portion of the strut on an opposite side thereof to a side, on which the pendant is connected; and a direct acting apparatus that applies, to the first bar-like member, a force pulling the first bar-like member toward the other side along a longitudinal direction of the first bar-like member.

Abstract: A lattice piece for a crane includes four corner posts and of null bars and diagonal bars connecting the same, wherein at least a part of the null and diagonal bars are foldably articulated to at least one corner post, and at least one adjusting unit is provided for performing the folding movement, wherein at least one drive is connected or connectable with at least one adjusting unit.

Abstract: A method of assembling a mobile lift crane that includes, during operation, i) a rotating bed having attached thereto a luffing jib hoist drum and line, and a rigging winch drum and line, ii) a boom pivotally mounted on the rotating bed, iii) a luffing jib pivotally mounted to the end of the boom, iv) a first strut also pivotally connected to the end of the boom, and v) a second strut connected to the boom below the connection point of the first strut, the method including: a) pivotally connecting the first strut to the end of the boom; b) pivotally connecting a first section of the second strut near the top of the boom; c) connecting the rigging winch line to the top of the first section; d) pivotally attaching a second section of the second strut to the first section such that the second section lies folded onto the first section, forming a folded second strut; and e) lifting the second section while retracting the rigging winch line to thereby bring the first and second sections into alignment with each ot

Abstract: A portable lifting system includes a moveable base component including a scissors lift assembly, and a crane assembly coupled the movable base component, the crane assembly including a support member and a boom coupled to the support member.

Abstract: A crane includes a crane pillar rotatably mounted about a vertical axis, at least one jib, connected to the crane pillar and pivotally mounted about a horizontal axis, at least one jib extension movably mounted in the jib, and at least one piston-cylinder unit for extending and retracting the jib extension relative to the jib. The first end of the piston-cylinder unit engages the jib via at least one first force-introducing region, and the second end engages the at least one jib extension via at least one second force-introducing region. The piston-cylinder unit has a central plane parallel to the horizontal axis about which the jib is pivotally mounted, and the piston-cylinder unit has a compressive deformation perpendicular to the central plane in a pressure-loaded state while the jib is being extended and a tensile deformation opposite the compressive deformation in a tension-loaded state while the jib is being retracted.

Abstract: Provided is a crane jib transition structure, including a jib section, a transition section and a supporting structure. The jib section matches with the transition section, and they fixedly connect to each other. The upper end of the supporting structure fixedly connects to the upper end of the side of the jib section. The bottom end of the supporting structure fixedly connects to the bottom end of the corresponding side of the transition section. The middle part of the supporting structure fixedly connects to the connection point between the side of jib section and the corresponding side of transition section. Therefore, the crane jib transition structure can not only achieve the strength of a crane jib transition structure, but also achieve the strength and the overall stability of a crane jib, by using the supporting structure connecting to between the crane jib section and transition section.

Abstract: A lower spreader of a construction machinery has a width smaller than a width of the front leg member; and a plurality of lower sheaves at the lower spreader includes at least; a first lower sheave at which the derricking rope let out from the derricking drum is first wound; a second lower sheave, disposed on a side where a fixed end of the derricking rope at which the derricking rope is fastened is located, at which the derricking rope is wound last; and a third lower sheave, disposed between the first lower sheave and the second lower sheave or at a position adjacent to either the first lower sheave or the second lower sheave, at which the derricking rope, running from an upper sheave among the plurality of upper sheaves at the upper spreader is wound so as to run toward another upper sheave at the upper spreader.

Abstract: A mobile telescopic crane has a telescopic jib with at least four part-jibs. Each of the part-jibs is constructed from at least two part-jib portions so as to be telescopic in a longitudinal direction. Part-jib portions arranged at a spacing from one another transverse to the longitudinal direction each form a jib portion with at least one flexurally rigid connecting element. A construction of this type of the jib means that an increase in the bearing load is easily achieved by increasing the area moment of inertia of the jib.

Abstract: A heavy duty vehicle recovery system employs a crane/tow boom assembly which is pivotally mounted to an upright assembly and is transformable between various positions. Two variably positionable booms with slidable extensions are provided. The crane/tow boom assembly extends rearwardly from the lower portion of the upright assembly. When the upright assembly is in an upright position, the boom assembly is upwardly pivotal from the upright assembly. When the upright assembly is in a reclined position, the crane/tow boom assembly is pivotally transformable to a transport position generally parallel to the upright assembly. The crane booms may be independently positioned at different elevational angles and different extensions.

Abstract: A working machine includes a base machine and a working attachment. The working attachment has a base-end boom, a lead-end boom, and an arm. The working machine is collapsible into a triple-folded state, with the base-end boom being located on the upper side and the arm being located on the lower side with respect to the lead-end boom, as a posture of the working machine for transport. The working machine further includes a lead-end boom cylinder for moving the lead-end boom, and an arm cylinder for moving the arm. The lead-end boom has a first lead-end boom cylinder attachment portion for mounting the lead-end boom cylinder, and a first arm cylinder attachment portion for mounting the arm cylinder. The first lead-end boom cylinder attachment portion is disposed at a position different from the first arm cylinder attachment portion in a widthwise direction of the working attachment, and lower than the first arm cylinder attachment portion in the transport posture.

Abstract: Method for adjusting the angle of a jib system of a crane, comprising the steps of providing two jib units of the jib system, which can be variably arranged with respect to their longitudinal axes in an angle position in relation to one another, arranging connecting links attached to the jib units in such a way that the longitudinal axes of the jib units are parallel in a starting angle position, starting openings and target openings of the connecting links are aligned with one another pairwise to insert a connecting element connecting the jib units, the aligned starting openings being connected with the connecting element, relieving the connecting element connecting the aligned starting openings, removing the first connecting element, connecting a pair of the aligned target openings with the connecting element, and arranging the jib units in a target angle position which is different from the starting angle position.

Abstract: A hydraulically actuatable jib for a loading crane includes at least two jib extensions, the first jib extension being designed as an outer jib extension and the second jib extension being designed as an inner jib extension. At least two feed cylinders extend and react the at least two jib extensions. A hydraulic circuit for a working fluid includes a retraction line for retracting the feed cylinders in a pressurized manner, and the retraction line opens into the feed cylinder of the outer jib extension. A tank is provided for releasing the working fluid, and a control valve can be switched into an open position when the outer jib extension reaches a defined retraction position, particularly when the outer jib extension is substantially fully retracted. The valve thereby supplies the feed cylinder of the inner jib extension with pressurized working fluid.

Abstract: A lattice structure which is movable to and fro between a condition folded out and a condition folded in, wherein the lattice structure includes props extending in longitudinal direction of the lattice structure and wherein the lattice structure furthermore includes struts which connect said props with each other. According to the invention, at least one of the struts has at least one joint about which at least two portions of the strut are pivotable relative to each other, and that at least one of the struts has no such joint.

Abstract: A crane, in particular a vehicle crane, includes a first crane arm and at least one second crane arm which are connected together by a joint. The crane arms are pivotable relative to each other by a drive having a piston-cylinder unit, in each case starting from one of the two end positions in which the crane arms are in substantially mutually parallel relationship until reaching a dead point when the longitudinal axis of the piston-cylinder unit is substantially on a line with the joint. There is provided at least one second drive by which it is possible to go beyond the dead point position of the piston-cylinder unit relative to the joint.

Abstract: The danger of a jib falling off a boom due to an erroneous operation during movement of the jib between a stowage position and an extended position is eliminated. The jib is provided with a pivot pin insertion state detector, pivot pin retraction blocking element, a coupling pin insertion state detector, first and second cables, wherein movement of a coupling pin to a retracted position is restricted by a coupling pin retraction blocking element via the first cable when the pivot pin insertion state detector has detected that the pivot pin is retracted, and movement of the pivot pin to the retracted is restricted by the pivot pin retraction blocking element via the second cable when the coupling pin insertion state detector has detected that the coupling pin is retracted, so that simultaneous removal of both of the pivot pin and the coupling pin is prevented.

Abstract: A crane assembly includes an anti-two block system having a rigid body, a sensor configured to detect upward loading of the body, and a spring biasing the body to a pin of a sheave. The body includes a base, two extensions projecting perpendicularly upward from the base and extending outside the sheave on opposite sides thereof, and a fitting on upper ends of the extensions. The fitting couples to the pin of the sheave such that the body is configured to rotate about the pin. The crane assembly further includes a controller comprising logic configured to prevent movement of a hook in response to a signal from the sensor of the anti-two block system. The weight of the body of the anti-two block system rotates the body such that the extensions are substantially aligned with a cable between an end of a boom and a hook as the boom rotates.

Abstract: A boom for a crane assembly includes first and second sections. The second section is configured to be at least partially nested within the first section of the boom, and is further configured to slide relative to the first section of the boom. Each of the first and second sections of the boom have a tubular cross-section. Furthermore, the first and second sections of the boom each include first and second pieces. The first piece has two edges extending lengthwise along the respective section, and the second piece has two edges extending lengthwise along the respective section. The first and second pieces are arranged such that the two edges of the first piece overlap the two edges of the second piece, and the first and second pieces are welded together along an exterior end of the overlapping edges.

Abstract: A crane assembly includes a main body, a boom extending from the main body, a cable, and a hook coupled to an end of the boom opposite to the main body by the cable, where the crane assembly is configured for lifting items via the hook. The crane assembly further includes a projection extending outward from the boom and curving toward the main body. The projection is configured to receive the hook over an end of the projection such that tension in the cable maintains the hook in place on the projection. Gravity is sufficient to release the hook from the projection when the boom is raised and the tension in the cable is released.

Abstract: The present invention relates to a lattice structure which is adjustable between a condition folded in and a condition folded out, wherein the lattice structure includes longitudinally extending props which in the condition of the lattice structure folded out are connected with each other by obliquely extending struts, wherein the obliquely extending struts are directly or indirectly pivotally arranged on the longitudinally extending props and wherein at least one of the obliquely extending struts has a first portion and a second portion which are connected with each other in an articulated manner such that their angle to each other becomes smaller on folding in the lattice structure.

Abstract: The present invention relates to a boom element for a telescopic boom, in particular a telescopic section or a pivotal piece of a telescopic boom, wherein the boom element has a substantially box-shaped hollow structure and wherein at least one component of a pinning system is arranged in at least one of the corner edges of the box-shaped hollow structure, wherein at least one further boom element located in the boom element and/or about the boom element can be pinned to the boom element by means of the pinning system for the purpose of fixing, and wherein the component of the pinning system is and/or includes at least one pin mount and/or at least one pin guide in which the at least one pin is guided and/or movable.

Abstract: A backstay spreader attachable between a pair of backstay sections on a crane includes first and second members each having a backstay section connector at a first end and a pivoting joint connector at a second end, the pivoting joint connectors being used to hold the first and second members together with a pivotal connection and each having an extending portion extending away from the pivotal connection, with an angle between the extending portions. The backstay spreader also includes an actuator mounted between the pivoting joint connectors. The actuator controls the angle between the extending portions of the two pivoting joint connectors, which defines an angle between the first and second members.

Abstract: An arrangement includes a winch that is preferably used for hoisting loads as well as an adjusting mechanism for the winch. In the assembled state, the winch is mounted on a crane boom so as to be movable by a limited degree between an operating position and a transported position by means of the adjusting mechanism. The adjusting mechanism is equipped with at least one linear drive unit which cooperates with a lever gear to adjust the winch.

Abstract: A lattice piece for a crane includes four corner posts and of null bars and diagonal bars connecting the same, wherein at least a part of the null and diagonal bars are foldably articulated to at least one corner post, and at least one adjusting unit is provided for performing the folding movement, wherein at least one drive is connected or connectable with at least one adjusting unit.

Abstract: The invention relates to a construction apparatus comprising a base carrier, a mast which is arranged on the base carrier in a pivotable manner, a first hydraulic cylinder and a second hydraulic cylinder for erecting the mast, which are connected to each other in an articulated manner in a connecting section, the first hydraulic cylinder being linked to the base carrier and the second hydraulic cylinder being linked to the mast, and a coupling rocker-arm which is linked on one side to the mast and on another side to the connecting section. According to the invention in the part of the connecting section a spacer is arranged, through which the connecting section is supported on the mast in a detachable manner.

Abstract: The danger of the jib falling-off due to an erroneous operation both during an operation to extend the jib from a stowage position to an extended position and during an operation to stow the jib from the extended position to the stowage position is eliminated.

Abstract: A method of assembling a mobile lift crane that includes, during operation, i) a rotating bed having attached thereto a luffing jib hoist drum and line, and a rigging winch drum and line, ii) a boom pivotally mounted on the rotating bed, iii) a luffing jib pivotally mounted to the end of the boom, iv) a first strut also pivotally connected to the end of the boom, and v) a second strut connected to the boom below the connection point of the first strut, the method including: a) pivotally connecting the first strut to the end of the boom; b) pivotally connecting a first section of the second strut near the top of the boom; c) connecting the rigging winch line to the top of the first section; d) pivotally attaching a second section of the second strut to the first section such that the second section lies folded onto the first section, forming a folded second strut; and e) lifting the second section while retracting the rigging winch line to thereby bring the first and second sections into alignment with each ot

Abstract: An all terrain vehicle having a vehicle frame with a boom frame attached to the vehicle frame, a saddle nest attached to the boom frame, a pivot saddle respectively secured to the boom frame, a telescoping boom secured in the pivot saddle, the pivot saddle comprising a post disposed adjacent and parallel to the telescoping boom, a locking sleeve slidably mounted on the post, and a latch formed on the vehicle frame with the locking sleeve and latch adapted to interlock to maintain the telescoping boom in an upright position.

Abstract: A mobile lift crane includes a carbody having moveable ground engaging members; a rotating bed rotatably connected to the carbody such that the rotating bed can swing with respect to the ground engaging members; a boom pivotally mounted on a front portion of the rotating bed and a mast mounted at its first end on the rotating bed and having a second end; and at least one hydraulic cylinder pivotally connected at a first end to the rotating bed. The hydraulic cylinder is positioned and configured so as to be able to raise the second end of the mast from the mast being in a near horizontal position to a position where the mast is used during crane pick, move and set operations. In a preferred embodiment, at least one arm is pivotally connected at a first end to the rotating bed and at a second end to the hydraulic cylinder. The arm and cylinder are connected together such that extension and retraction of a piston within the hydraulic cylinder causes the second end of the arm to raise and lower.

Abstract: An excavation apparatus includes a support structure mountable to a truck bed, the support structure defining a longitudinal direction extending front-to-back of the truck bed, and a lateral direction extending side-to-side of the truck bed. The apparatus further includes a rotary spindle pivotably supported by the support structure at a first pivot joint defining a generally horizontal first pivot axis, the spindle extending lengthwise along a spindle axis and rotatable thereabout for driving a cutting head; the spindle pivotable about the horizontal first pivot axis between a stowed position wherein the spindle axis is generally horizontal, and a deployed position wherein the spindle axis is generally vertical. The support structure includes a first adjustment device for adjusting the position of the spindle in the longitudinal direction when deployed, and a second adjustment device for adjusting the position of the spindle in the lateral direction when deployed.

Abstract: Disclosed is an arrangement comprising a winch that is preferably used for hoisting loads as well as an adjusting mechanism for the winch. In the assembled state, the winch is mounted on a crane boom so as to be movable by a limited degree between an operating position and a transported position by means of the adjusting mechanism. The adjusting mechanism is equipped with at least one linear drive unit which cooperates with a lever gear to adjust the winch.

Abstract: The within invention concerns a vehicle crane with a telescopic boom that can move on a horizontal axle and rotate on an upright axle with a pivot section, telescoping sections that can telescope out of the pivot section, and also with two anchor supports flexibly housed on one of the sections so that they can pivot out of transportation position, in which they are folded essentially parallel to each other against the section, and can be spread apart into an erect, particularly V-shaped, operation position. The invention also concerns a process for assembling or dissembling said anchor supports of the telescoping boom of the vehicle crane. According to the invention, when the boom is lying in essentially horizontal position, the anchor supports can be disassembled, are positioned on brackets provided next to the boom, and after the boom is raised are raised from the brackets and loaded by the boom itself.

Abstract: The invention relates to a crane lattice boom comprising at least two boom sections (3, 5, 7, 9) and at least one guy support (27, 41) for a rope guy arrangement with a guy rope (13), wherein the base (11) of the at least one guy support (27, 41) is designed such that it can be secured between two boom sections.

Abstract: A tensioning system for a mobile telescopic crane having a telescopic mast includes at least one tensioning cable for bracing the telescopic mast and at least one tensioning winch mounted on the crane superstructure for tensioning the cable. The tension in the cable creates a pressure bias within the mast. The winch is movable with respect to said superstructure of the crane and movement of the winch relative to the superstructure also imposes tension on the tensioning cable.

Abstract: A deployable boom with adjacent panels hinged together typically in an end to end configuration. A first longeron is attached to at least two panels and a second longeron is also attached to at least two panels. Each longeron includes a self locking hinge between adjacent panels.