Abstract: This invention relates to a method for erecting a main boom of a truck crane, which at least consists of a telescopic boom, with a fly jib which is braced via bracing trestles and bracing rods, and with a spatial boom bracing. In accordance with the invention, the main boom is braced by means of the spatial bracing before being completely connected with the fly jib.

Abstract: A stabilizer cable has a first end and a second end, wherein the first end is coupled to a crane load. The stabilizer cable loops around a boom pulley that is attached to a crane boom, then runs through a traveler pulley, then loops around a floating pulley, then loops around a deflector pulley. The deflector pulley and the second end of the stabilizer cable are positioned such that an increase in tension of the stabilizer cable urges the suspended load toward the traveler pulley. Other embodiments are also described.

Abstract: The invention relates to a jib-bracing system for a revolving tower crane, in the case of which the length of a jib (2) and the length of a bracing means (5) for the jib can each be changed. The bracing means comprises at least part of a cable (6) of which one end can be connected to the jib at at least two different fixed points (8, 9) arranged on the jib, wherein a deflecting element (7), over which the cable can be guided, is arranged on the jib, and wherein the one end of the cable can be fastened at at least one of the fixed points when the cable has been guided over the deflecting element.

Abstract: A chain, wound to span between two pulleys each having facing conical surfaces able to change a distance therebetween and sandwiched by the facing conical surfaces, includes: link units each configured such that plate-shaped links, each having openings, are oriented in a chain circumferential direction and arranged in a chain width direction; and pins each extending through the openings of the links of the link units adjacent in the chain circumferential direction and each contacting the conical surfaces of sheaves at both ends thereof. A curvature radius of a shape curve representing a shape of each end face of each pin in a plane perpendicular to the chain circumferential direction is larger at an inner side in a pulley radial direction than at an initial contact point that is a contact point at the time when a load on each pin is 0.

Abstract: The invention relates to a belt tensioner with a belt shaft (10), a force limitation arrangement (70) connected with the belt shaft (10), and a tensioner drive wheel (20) coupled with the belt shaft (10) so as to be locked against relative rotation, in which a retaining element (30, 50) is provided for coupling the tensioner drive wheel (20) to the belt shaft (10), and the retaining element (30, 50) is releasable by the rotation of the belt shaft (10) in the belt webbing withdrawal direction after the tensioning movement has been completed.

Abstract: A gantry crane (10) is configured in a panel turner application. The gantry crane (10) generally includes a gantry crane structure (14) having a first cross-beam (28) and a second cross-beam (30). A first main hoist mechanism (40) and a first auxiliary hoist mechanism (42) are coupled to the first cross-beam (28), and a second main hoist mechanism (44) and a second auxiliary hoist mechanism (46) are coupled to the second cross-beam (30). The crane (10) includes a hydraulic system configured to reduce the lift capacity of the first and/or second main hoist mechanism (40, 44), and to equalize the hoist capacity between the first and second main hoist mechanisms (40, 44) or the first and second auxiliary hoist mechanisms (42, 46) in certain applications. The auxiliary hoist mechanism (42, 46) are configured for powered movement along the respective cross-beams (28, 30).

Abstract: A remote heave compensation system associated with a crane on a vessel may include a heave compensator arranged remotely from the crane and configured to translate in association with and to compensate for heaving motion of the vessel, an equalizer arranged on the crane and coupled to an end of a multiline system of the crane, a heave line secured to the equalizer at a first end and secured to the heave compensator at a second end, wherein compensating motion of the heave compensator is transferred to the equalizer by the heave line to compensate for heaving motion of the vessel and stabilize objects suspended from the multiline system of the crane.

Abstract: A vessel (4) includes a crane (1) connected to a deck (5) of the vessel. The crane (1) includes a frame (10) which is rotatable about a horizontal hinge axis (H), a rotation mechanism (20) connected to the frame (10) at a position away from the horizontal hinge axis (H), arranged to rotate the frame (10) about the horizontal hinge axis (H) from an upper position to a lower position and vice versa, and a swivel member (30), which is with a first end (31) rotatable connected to the deck (5) and which is with a second end (32) rotatable connected to the rotation mechanism (20). The swivel member (30) is rotatable between an inward position associated with the upper position of the frame (10) to an outward position associated with the lower position of the frame (10).

Abstract: In a webbing take-up device, a cut-out portion is formed in a close-off portion that closes off a pawl housing groove from a side opposite a spool body side. For this reason, the close-off portion is not formed in a position facing ratchet teeth which is at from a second ratchet tooth from a take-up direction side to the other side. Due to this, even if a head portion of a lock pawl, particularly a take-up direction side portion of the head portion, is displaced in such a way as to move away from the spool body, the head portion does not come into contact with the close-off portion or, even if the head portion comes into contact with the close-off portion, a force with which the head portion presses the close-off portion becomes smaller.

Abstract: An enhanced stability crane (100) is described. Embodiments include a telescoping main support mast (114) upon which a crane base (106) resides. A boom (140) projects upwardly from the crane base and a jib (148) typically projects upwardly from the boom. A clamping assembly (108) resides on the main support mast and is configured to attach to an existing structure adjacent to the crane, in order to enhance stability. Multiple clamping assemblies can be distributed along the telescoping main support mast when it is extended. The existing structure is generally a tower structure (180) that is columnar and vertical in shape and orientation, and frequently has an elliptical horizontal cross-section. Tower structures are typically, but not necessarily, wind turbine towers. In some embodiments, the crane is mobile capable of lifting objects weighing about 110 tons to a height of about 400 feet. The crane typically adjusts to a collapsed configuration, enabling facile transport.

Abstract: An access system for facilitating access to an elevated deck of a mobile crane includes a staircase having a support post defining an axis of inclination. A plurality of ascending steps is connected to the at least one support post, and a mounting bracket is pivotally coupled to an upper end of the at least one support post. The staircase is pivotable about a longitudinal axis such that a lower end of the at least one support post is induced to move in a lateral direction in response to pivotal motion of the at least one support post. A caster is coupled to the lower end of the support post for supporting the staircase on a ground surface. The caster supports the staircase on the ground surface throughout longitudinal movements of the staircase and lateral movements of the staircase induced by vertical movements of the mobile crane.

Abstract: A chain tensioner includes a shoe including a first spring-receiving slot and a second spring-receiving slot. The first slot includes a first side wall and a first installation tab. The second slot includes a second side wall and a second installation tab. A stack of one or more leaf springs is installed into the first and second spring-receiving slots over first and second installation tabs, and a first end of the stack is laterally retained in the first slot between the first installation tab and first side wall, and a second end of the stack is laterally retained in the second slot between the second installation tab and second side wall. The installation tabs are necessarily lower in height than first and second side walls to allow the spring stack to be installed thereover. The first and second installation tabs are each located in an outboard position and the first and second side walls are located in an inboard position.

Abstract: The assembly comprises a bearing unit (10) with outer (11) and inner (12) rings and an outer wheel (20) of plastic material which is overmolded onto the outer bearing ring and is adapted for being engaged by a driving belt. A sleeve unit (30) is integral with the inner bearing ring (12). The sleeve unit includes one or more rigid tubular spacers (31, 32) and a central, plastic tubular core (33). The spacers (31, 32) are axially aligned with the inner bearing ring (12) and abut against one or both of the opposite sides (14, 15) of the inner bearing ring (12). The central tubular core (33) is overmolded into and axially extending along radially inner cylindrical surfaces (16, 34, 35) of both the inner bearing ring (12) and tubular spacer(s) (31, 32).

Abstract: In lateral outriggers, e.g. of a mobile crane touch-free position sensors are arranged for the extension length and the operating range of the mobile crane is limited as a function of the currently measured values. In particular the touch-free magnetostrictive position sensors in a very flat housing can be well arranged between the particular telescope profiles without being exposed to the risk of damages.

Abstract: When an axis of rotation 9a2 of a spool rotates in the seatbelt retracting direction, a lock gear 13 rotates clockwise which is the same direction as the spool, and an eccentric gear 16 rotates counterclockwise. A cam 20 of the eccentric gear 16 comes into contact with a lever 36 of the control lever 35 to cause the control lever 35 to rotate counterclockwise to take an operating position. A pressed pin 42b of a lever 42 comes into contact with a lever 37, so that levers 42, 43 rotate counterclockwise. A holding portion 42c of the lever 42 opposes a flywheel 14. Accordingly, since the holding portion 42c presses a held portion 14d when the entire amount of a seatbelt 4 is retracted, a rocking movement of the flywheel 14 is prevented and hence end locking is prevented.

Abstract: A crane column segment connection system includes first and second column segments with a connector on the second end of the first segment mating with a connector on the first end of the second segment. The connectors each include at least one extension having a through-hole. The through-holes have an axis and are positioned in the extensions such that all through-holes of mating connectors are aligned when the column segments are aligned. In one aspect, the connectors include alignment surfaces cooperating such that when the first and second connectors are being brought together during column assembly, the alignment surfaces guide the column segments in two dimensions within a plane transverse to the axis of the through-holes into a relative position such that the through-holes through the extensions in the connectors are aligned.

Abstract: A pulley assembly for an automobile auxiliary apparatus, such as an alternator, that dampens torsional impacts and reduces the stress on the auxiliary apparatus, the belt drive system and other apparatuses, by use of both wear-prone damping elements and a one-way overrunning clutch mechanism allowing for the free run of the pulley shaft.

Abstract: A method of connecting sections of a crane suspension assembly together includes attaching a frame to a member of a first section; connecting a tension member between the frame and a connector used in the assembly; moving the tension member so that the connector pivots about a pin to a position where a second hole in the connector is in alignment with a hole in a second section member; putting a second pin through the hole in the connector and the hole through the second section member; and disconnecting the tension member from the connector. The method may also include attaching a frame with a winch to a section of the crane suspension assembly; connecting a line from the winch to the connector; activating the winch to move the connector so that it pivots about a pivot axis; and securing the connector in its second position.

Abstract: Systems and methods for an engine drive system are described herein. In one example, the system includes a camshaft, a crankshaft, and an accessory drive. The system may include a first chain coupling the camshaft and crankshaft in a first plane, and a second chain coupling the accessory drive and crankshaft in a second plane non-planar to the first plane. The system may further include a chain guide including a first surface guidingly contacting the first chain and a second surface guidingly contacting the second chain.

Abstract: A lattice mast crane having a lattice mast boom which can be luffed up in a vertical luffing plane and which comprises a pivotal connection piece, a plurality of lattice pieces releasably connectable to one another, and a head piece, with the lattice mast boom having a two-strand or multi-strand region, wherein at least one side part is releasably arranged at the pivotal connection piece and the two-strand or multi-strand region is arranged directly or indirectly at the pivotal connection piece and/or directly or indirectly at least one side part.