Abstract: A counterweight device installed in a rear end portion of a machine body frame includes amounting table having amounted counterweight, a hydraulic cylinder that raises/lowers the mounting table, a connection structure that connects the mounting table and a cylinder rod of the hydraulic cylinder, a support member that supports the hydraulic cylinder on the mounting table via an oscillating spindle, a first coupling mechanism that couples the connection structure and the rear end portion of the machine body frame to each other at a position where an upper end of the rear end portion is lower than an upper end of the connection structure, a second coupling mechanism that couples the support member and the rear end portion of the machine body frame to each other, a first operation unit that operates the first coupling mechanism, and a second operation unit that operates the second coupling mechanism.

Abstract: A rear derailleur is provided for a bicycle. The rear derailleur has an upper alignment assembly and a lower alignment assembly pivotally connected via a linkage assembly. The upper alignment assembly is pivotally attached to the bicycle along a b-knuckle mounting axis, and the upper alignment assembly includes a motor assembly to pivot the upper alignment assembly along an upper rotatable axis that is generally perpendicular to the b-knuckle mounting axis. The lower alignment assembly is pivotally attached to a pulley assembly along a p-knuckle mounting axis, and the lower alignment assembly includes a motor assembly to pivot the lower alignment assembly along a lower rotatable axis that is generally perpendicular to the p-knuckle mounting axis.

Abstract: In an aspect, an isolator is provided for isolating a device driven by an engine via an endless drive member. The isolator includes a shaft adapter that is connectable with a shaft of the device and that defines an isolator axis, a rotary drive member that is engageable with the endless drive member, a first isolation spring arrangement that includes a first torsion spring, and that is positioned to transfer torque between the shaft adapter and an intermediate drive member, and a second isolation spring arrangement that is positioned to transfer torque between the intermediate member and the rotary drive member.

Abstract: An installation jib for a girder beam installation and removal system includes a main body having a first end and a second, opposite end, the main body extending along a longitudinal axis between the first end and the second end. The installation jib further includes a first sub-frame element coupled to the main body, a first roller coupled to the first sub-frame element, a second sub-frame element coupled to the main body, and a second roller coupled to the second sub-frame element. The first sub-frame element and the second sub-frame element are spaced longitudinally apart from one another, and the first roller and the second roller each are configured to rotate about an axis that is parallel to the longitudinal axis.

Abstract: An overhead travelling crane having a horizontally extending crane girder, which can be displaced in a railbound manner along a craneway, and having a crane trolley, which can be displaced along the crane girder and carries a lifting gear for raising and lowering a load. The lifting gear has a suspension structure formed as a cable or chain and the overhead travelling crane has electric drives for movements of the overhead travelling crane. The overhead travelling crane has an energy store connected to the drives to supply the drives with energy.

Abstract: A mobile crane comprising a main boom, which is supported on the mobile crane in such a way that the main boom can be rocked and which can be put upright by means of an elevating cylinder, and a main boom extension, which is releasably connected to a main boom head of the main boom by upper and lower pins. The main boom extension, proceeding from a home position, can be angled in relation to the main boom about a rocking axis by means of an angle drive after the upper pins have been released, which angle drive acts on a base of the main boom extension, where a drive of the mobile crane provided for a different task provides the kinetic energy for the angle drive. The angle drive is designed in such that a telescoping cylinder of the main boom provides the kinetic energy for the angle drive.

Abstract: The present disclosure relate to an improved portable distribution transformer hoisting rack, comprising a loose-leaf hold hoop, a fixed hold hoop, a supporting rod, and a length-adjustable adjusting rod, wherein: the loose-leaf hold hoop includes a first hold hoop, a second hold hoop, and a third hold hoop, the third hold hoop being disposed between the first hold hoop and the second hold hoop; one end of the supporting rod being rotatably connected to the third hold hoop; the other end of the supporting rod being provided with a hoisting assembly, one end of the adjusting rod being movably connected to the supporting rod, and the other end of the adjusting rod being movably connected to the fixed hold hoop.

Abstract: A hoisting system for a machine includes a winch assembly, and a boom such as a sideboom that is pivotable. The hoisting system further includes a fairlead supported at a fixed orientation such that a feed angle of a hoisting cable extending through the fairlead varies in response to pivoting of the boom. A hoisting control system for the machine includes a cable state sensing mechanism resident on the fairlead and structured to produce cable monitoring data indicative of at least one of a cable feed length, a cable feed angle, or a cable load, and an electronic control unit structured to output an alert based on the cable monitoring data.

Abstract: A hydraulic tensioner (10) and method of manufacture can include a housing (12), a piston (16) moveable from a retracted position toward an extended position with respect to the housing (12) in response to fluid pressure, and a tensioner spring (36) biasing the piston (16) toward the extended position. The hydraulic tensioner (10) can include a modular sleeve (14) supported by the housing (12) and defining an aperture (15) for slidably receiving the piston (16) and defining an expandable fluid chamber (18). The housing (12) can provide a fluid passage (39) for fluid communication between the expandable fluid chamber (18) and a source of pressurized fluid. The housing (12) can have a seat (25) in fluid communication with the aperture (15). An end (38) of the modular sleeve (14) can be seated with respect to a seat (25) of the housing (12) to seal the fluid passage (39).

Abstract: A lifting unit includes a jib foot forming a proximal part of a jib in a service configuration, a counter jib supporting a balancing ballast, a securing part between the jib foot and the counter jib to secure the lifting unit to a mast, and a cylinder connected to the jib foot such that the jib foot is movable between a lowered position and a lifted position. A second cylinder is connected to the securing part.

Abstract: A movable crane arrangement includes a main girder for a trolley; end girders with running wheels to be supported on both ends of the main girder; running platforms for the running wheels of the end girders; and one elongated container, inside which at least part of the crane arrangement is placed in a disassembled or folded state for transport, if desired. One running platform is arranged to be implemented on the roof of the container at a selected height, and the other running platform is arranged to be implemented on the erecting platform of the crane arrangement. A method for erecting such a crane arrangement is also provided.

Abstract: A portal gantry crane including: two parallel main girders running side by side on respective sides of a midplane, two legs each positioned in the midplane, two couples of trolleys, each couple of trolleys operating on a corresponding girder, each trolley carrying a hoist.

Abstract: The invention relates to a crane, such as a hoisting crane (3000) having a hoisting boom (3010) having a lifting region (3020), configured to lift a load (3050) and an actuatable restraint device (3040), the device extending from the crane. The actuatable restraint device is configured to engage with a load being lifted, so as to control movement of that load with respect to the lifting region in at least one direction. The actuatable restraint device may be configured to control movement in as much as inhibiting, or mitigating, certain movement.

Abstract: A wheeled crane and self-demounting and self-mounting methods for supporting legs thereof is disclosed. The wheeled crane includes a vehicle frame and auxiliary supports, and the auxiliary supports can enable the vehicle frame to keep balance. Since the wheeled crane has auxiliary supports, when the supporting legs are demounted or mounted, the auxiliary supports function as supporting legs, so that the supporting legs can be mounted and demounted by the operation part of the wheeled crane with no need of using an auxiliary crane, and thus the self-mounting and self-demounting of the supporting legs of the wheeled crane are realized.

Abstract: A modular crane, with a pot-shaped element on which an upper carriage of the crane can be mounted such that it can rotate about a rotational axis, multiple support carriers hinged to the pot-shaped element such that they can each pivot about a pivot axis for support on the ground, and a separable driving base on which the pot-shaped element can be secured.

Abstract: Disclosed is a mobile articulated crane having a boom for carrying a load when the crane is stationary and while the crane is mobile. The boom has an end for engaging with a load and an opposed end. The crane further comprises a counterweight attached to the boom at or close to the opposed end of the boom. A rear body of the crane can comprise first and second rear axles, each for supporting the rear body on the ground. The first rear axle can be arranged to be displaced relative to the second rear axle such that wheels of the first rear axle selectively engage or disengage with the ground.

Abstract: In a crawler crane, while a fly jib is in use, the fly jib is suspended from a coupling flange by a jib raising/lowering wire rope that is wound around a sheave, the sheave being slidably attached to a tip end side section of the fly jib. If the sheave is caused to slide by a jib raising/lowering cylinder attached to the fly jib, the fly jib suspended from the coupling flange by the jib raising/lowering wire rope inclines with respect to a boom. The raising/lowering mechanism of the fly jib is installed on the fly jib side, thus making it possible to easily perform work to extract/store the fly jib.

Abstract: A guiding belt pulley, which is configured to engage a belt with belt teeth, includes a ring configuration having a root circle at an edge thereof and a plurality of pulley teeth projected from the root circle of the ring configuration, wherein each of the pulley teeth slants related to a radial line of the ring configuration. A shift gap and a move gap are left between each pair of the pulley teeth and the belt teeth to provide spaces for the deformed belt. It may reduce a risk of disengagement of the belt and provide a safe way of power transmission.

Abstract: A method for damping rotational oscillations of a load-handling element of a lifting device is created, wherein at least one controller parameter is determined by a rotational oscillation model of the load-handling element as a function of the lifting height (lH) and wherein, to damp the rotational oscillation of the load-handling element at any lifting height (lH), the at least one controller parameter is adapted to the lifting height (lH).

Abstract: A bicycle rear sprocket assembly comprises a first sprocket, a second sprocket, and a sprocket support. The first sprocket includes a first sprocket body and a plurality of first sprocket teeth. The first sprocket body has at least one first recess. The second sprocket includes a second sprocket body and a plurality of second sprocket teeth. The sprocket support is configured to engage with a bicycle hub assembly. The sprocket support includes a sprocket attachment part. The first sprocket and the second sprocket are attached to the sprocket attachment part. The sprocket attachment part is at least partly provided in the at least one first recess to transmit a rotational force between the first sprocket and the sprocket support.