Abstract: This crane is configured by being provided with: a telescopic boom having an inside boom element and an outside boom element that overlap each other in an extendable and contractible manner; an extension/contraction actuator that displaces one boom element among the inside boom element and the outside boom element in the extending and contracting directions; at least one electric drive source provided in the extension/contraction actuator; a first coupling mechanism that operates on the basis of power from the electric drive source and that switches between the coupled state and the uncoupled state of the extension/contraction actuator and one of the boom elements; and a second coupling mechanism that operates on the basis of power from the electric drive source and that switches between the coupled state and the uncoupled state of the inside boom element and the outside boom element.

Abstract: Telescopic arm for a crane for lifting loads, which comprises a first tubular segment, a second tubular segment located in the first segment and extractable with respect to the first segment along an extraction axis (X). The telescopic arm comprises a clamping device configured to axially and selectively clamp, along the extraction axis (X), the first segment and the second segment. The clamping device comprises a clamping seating provided in the first segment and a clamping pin associated with the second segment, sliding along a sliding axis (Z) transverse to the extraction axis (X) and able to be selectively inserted in the clamping seating.

Abstract: A mast erection system includes a first mast erection apparatus that is adapted to pivotably raise a drilling rig mast of a drilling rig assembly to an intermediate raised position wherein the drilling rig mast is oriented at a first acute angle relative to a horizontal plane, and a second mast erection apparatus that is adapted to further pivotably raise the drilling rig mast from the intermediate raised position at the first acute angle to a fully raised position wherein the drilling rig mast is oriented at a second angle relative to the horizontal plane that is greater than the first acute angle.

Abstract: When an extension pattern selection device is activated, a normal mode is displayed on a screen of a monitor. An operator presses a manual mode switch key of an operation unit to switch the display mode of the screen from the normal mode to an extension pattern manual rearrangement mode. In the extension pattern manual rearrangement mode, the operator rearranges extension patterns so that frequently selected extension patterns P may be displayed at upper positions. Thus, the frequently selected extension patterns P are more preferentially displayed than the other extension patterns P.

Abstract: A crane apparatus includes: a telescopic boom including a plurality of boom members, the telescopic boom performing telescopic motion by moving the plurality of boom members one by one using one telescopic cylinder; a condition input part configured to receive, as input, a condition for a crane operation including at least a weight of goods suspended by the telescopic boom, a height to which suspended goods are lifted, and a moving radius of the suspended goods; and a telescopic pattern selecting part configured to select a telescopic pattern that allows the crane operation under the condition inputted to the condition input part.

Abstract: A rope guide for a crane, in particular a rope guide for a telescopic crane, comprises at least one guiding element for a rope which extends from a boom head along the boom of the crane. The guide is characterized in that at least one of the guiding elements comprises a spacer which has, on its rope-sliding surface facing the rope and as viewed transversely to the direction of the rope's extension, a substantially round concave form. Embodiments have a spacer with one or more grooves which guide and accommodate the rope.

Abstract: A portable winch and method of use is shown. One advantage of winches shown includes an ability to lower a boom or boom sections into limited access exit pit for winching operations such as pipe bursting. Sectional boom designs shown provide the ability to easily raise and lower a boom large distances without the need for a single long boom. Selected winch designs shown include flexible inserts between the boom and the winch frame that help resist damage from unforeseen shifting of the device during operation. Designs and methods shown also include multiple pulleys on a boom end unit. Fasteners are shown that reduce build up of debris.

Abstract: A crane jib system having a main jib, an auxiliary jib, and a telescoping cylinder. The main jib is comprised of main telescoping portions and the auxiliary jib is attached to the main jib and comprises auxiliary telescoping portions. The telescoping cylinder has a first telescopic part locking unit disposed on a base portion of the telescoping cylinder. The first telescopic locking unit is adapted to selectively engage the main telescoping portions. A second telescopic part locking unit is disposed on the telescoping cylinder above the first telescopic part locking unit. The second telescopic part locking unit is adapted to selectively engage the auxiliary telescoping portions.

Abstract: A telescopic boom for a crane has at least two telescopable telescoping sections in the form of lattice pieces, each of which exhibits a hollow structure that has in essence the shape of a box. The bottom chords of adjacent sections have in each instance a pinning structure to provide for pinning to each other during normal crane operations. By way of the design of at least the outer telescoping section, at least some of the force that is introduced into the pinned joint can be dissipated into the top chord of the boom.

Abstract: A lifting device with a telescopic pole having at least three successive modules mounted so that the modules can slide vertically with respect to each other. A drive strap transfers movement in order to extend an upper module with respect to an intermediate module when the intermediate module is caused to move with respect to a lower module of the modules. The drive strap is kept taut between two fixation points placed respectively on the lower module and upper modules and pass along a return pulley device mounted on the intermediate module. A safety system is normally maintained in inactive position by tension of the drive strap is automatically released into active locking position to prevent the upper module from continuing to move with respect to the intermediate module if the drive strap breaks.

Abstract: The present application relates to a mobile crane comprising a telescopic boom which has a hinged section and at least one telescopic section which can be telescoped out of it, or to a crawler-mounted crane. In accordance with one embodiment, as a position detection device, it has at least one transducer in the form of an inductively operating transponder, a receiver unit for the sensing of the position of the transducer, a control device for control in dependence on a signal of the receiver unit, as well as a signal transmission device in the form of a databus for the transmission of the signal data from the receiver unit to the control device.

Abstract: Construction elements and methods of using and making them in a structurally strong manner are disclosed. The construction element and the method of making it may be in the form of an elongated beam, a post or other. The element may include a generally tubular open frame formed of a series of conjoined octahedral sections constructed and arranged in a side by side manner joined together by conjoined pairs of tetrahedral sections disposed intermediate the octahedral sections. Each pair of octahedral sections may be constructed and arranged such that they are conjoined together by a common member, also common with the intermediate tetrahedral sections. The method may include forming an upright structure, using at least one large construction element having a plurality of octahedral and tetrahedral sections, and positioning at least one small construction element within an opening within the sections of the large construction element and affixing thereto.

Abstract: A telescopic boom includes a first frame having a curved portion whose section is substantially U-shaped, and a second frame connected to the first frame so that a closed section is formed. In the telescopic boom, the U-shaped curved portion of the first frame includes a plurality of protrusion portions formed at intervals in a circumferential direction of the telescopic boom, each protrusion portion extending in a longitudinal direction of the telescopic boom and being formed to have an arc-shaped section and protrude to the outside of the first frame.

Abstract: A pump jack for driving a reciprocating pump is provided. The pump jack comprises a support base and a support frame mounted thereto. A hydraulic cylinder is mounted to the support frame. A pulley mechanism is connected to a piston of the hydraulic cylinder, the support frame, and to a sucker rod of the reciprocating pump. The pulley mechanism translates movement of the piston into movement of the sucker rod such that pushing action of the piston provides pulling action acting on the sucker rod. A drive mechanism connected to the hydraulic cylinder for actuating the hydraulic cylinder.

Abstract: A telescoping structure includes a hollow outer section and a hollow inner section slidably mounted in the hollow outer section. The hollow outer section includes a first sidewall, a second sidewall and a third sidewall. The hollow inner section includes a fourth sidewall, a fifth sidewall and a sixth sidewall. A pair of sliding rails is disposed on the interior side of the first sidewall and a pair of raised sliding grooves is defined on the exterior side of the fourth sidewall. The pair of raised sliding grooves engages with the pair of sliding rails to enable a sliding movement of the hollow inner section relative to the hollow outer section.

Abstract: The subject matter of the invention relates to a support arm for a lifting platform, comprising at least one relatively wide support arm and an extension arm telescopically slidable therein, the arms each having torsionally rigid and flexurally stiff hollow profiles, a support bearing at the rear end of the accommodating arm for the pivotable hinging connection to a lifting carriage of a column and a bearing foot at the free end of the respective extension arm. A cost-effective production of support arms in different sizes and shapes is obtained by cutting at least the accommodating arm from a steel panel blank and forming it into a hollow profile and providing it with at least one transverse reinforcement.

Abstract: A beam for use in construction equipment is made from tailor welded panels. At least one of the panels is made from at least two pieces of material such as steel welded together with the weld running the length of the beam. The weld between pieces of steel can either be parallel to the longitudinal axis of the beam, or the pieces can be tapered and the weld will be at an angle diverging from the longitudinal axis of the beam. The two pieces of material have a different compressive strength per unit of length in a direction transverse to the longitudinal axis of the beam. In some embodiments a top panel is welded to two side panels to form two top corners of the beam and a bottom panel is welded to the two side panels to form two bottom corners of the beam.

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 apparatus includes: a telescopic boom including a plurality of boom members, the telescopic boom performing telescopic motion by moving the plurality of boom members one by one using one telescopic cylinder; a condition input part configured to receive, as input, a condition for a crane operation including at least a weight of goods suspended by the telescopic boom, a height to which suspended goods are lifted, and a moving radius of the suspended goods; and a telescopic pattern selecting part configured to select a telescopic pattern that allows the crane operation under the condition inputted to the condition input part.

Abstract: Disclosed are various embodiments of a platform telescoping system which comprises a platform, a first supporting arm, a second supporting arm, a telescopic driving mechanism which comprises a first power output, end and a rotational driving mechanism which comprises a second power output end. The first power output end is integrated with the second supporting arm and causes the second supporting arm to move in a first direction, and the second power output end is integrated with the platform and causes the platform to pivot between a first position and a second position. The second supporting arm telescopes with respect to the first supporting arm for adjusting the position of the platform. The space occupied by the platform telescoping system may be reduced while its functions enhanced.

Abstract: The present invention relates to a boom element for a telescopic boom, particularly a telescopic shot or a telescopic boom base section, wherein the boom element has cupped corner pieces and lattice bars, and the cupped corner pieces are interconnected by means of the lattice bars, wherein the lattice bars are arranged in a framework, at a right angle with respect to the corner pieces, and/or at an angle different from a right angle, particularly at an acute or obtuse angle, with respect to the corner pieces, and the corner pieces and the lattice bars form a substantially box-shaped hollow structure.

Abstract: The present invention relates to a telescopic section comprising a section tube having at least two bolt parts each having a cut-out, wherein at least one common bolt sheet is provided on or in the profile tube for reinforcing at least two bolt points.

Abstract: This invention relates to a crane, in particular a telescopic crane, with a frame suspended on the load hook for taking up a special load, in particular for taking up a rotor blade of a wind turbine. In accordance with the invention a single guide cable without guying function is provided, which proceeding from the boom foot is tensioned parallel to the direction of the longitudinal axis of the boom system and is attached to the boom system at its end, wherein a frame suspended on the load hook is connected with the guide cable via at least two control cables.

Abstract: A telescopic crane boom including a plurality of telescopically assembled tubular box sections including a base box section and an innermost box section having an open cross-section, and a boom head with a frame fixed to the outside circumference of the innermost box section. The head has a plurality of deflecting pulleys mounted on the frame, but no part extending inside the open cross section on the innermost base box section, whereby at least one additional box section can be inserted into the innermost box section in order to extend the boom.

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: A telescopic mast system includes a telescopic mast comprising a plurality of telescopic mast sections and a drive mechanism for extending and retracting the telescopic mast sections. The drive mechanism includes a rigid chain having one end connected to a last one of the telescopic mast sections to move the telescopic mast sections and a plurality of guide plates cooperating with the telescopic mast sections to prevent buckling of the rigid chain.

Abstract: The invention relates to a crane jib for a crane, having a longitudinal axis and an imaginary contour line that extends in a transversal plane relative to an axis of symmetry in an at least approximately mirror-symmetric manner. The contour line has an at least approximately arcuate section between a center that is equally interspaced from the first and second point of intersection on the axis of symmetry and the first point of intersection, and a first straight section is tangentially contiguous thereto in the direction of the second point of intersection. The imaginary extension of the first straight section in the direction of the second point of intersection intersects the axis of symmetry and forms an acute angle therewith.

Abstract: A pulley actuator implements a motor to drive a screw and a guide rod to relatively expand or retract while utilizing one flexible rope and two pulleys to drive three telescoped tubes to relatively expand or retract move correspondingly. The pulley actuator has a simplified structure as compared with the known devices and is easy to fabricate.

Abstract: A mast section for a telescoping tower system is made by aligning press brake tools along the length of the metal sheet at spaced width locations and forming the corners of the tube. After forming of the last corner, an opening remains along the length of the tube. The press brake male tool axis is offset sufficiently to permit the tool to apply forming force to the last corner of the tube through the opening, and is sized to remove the tool from the opening. At least three mast sections are nested to form the tower system. Pulleys for a cable extension system are mounted near the upper and lower ends of a wall of an intermediate mast section, with one of the pulleys being oriented at an acute angle to the mast section wall to permit routing of the cable.

Abstract: A portable winch and method of use is shown. One advantage of winches shown includes an ability to lower a boom or boom sections into limited access exit pit for winching operations such as pipe bursting. Sectional boom designs shown provide the ability to easily raise and lower a boom large distances without the need for a single long boom. Selected winch designs shown include flexible inserts between the boom and the winch frame that help resist damage from unforeseen shifting of the device during operation. Designs and methods shown also include multiple pulleys on a boom end unit. Fasteners are shown that reduce build up of debris.

Abstract: An opposed-rope driven telescoping mast assembly includes a stationary support and a longitudinal mast comprising a longitudinal section joined to move relative to the stationary support. A drive assembly drives the longitudinal mast and includes a frame and a rotatable drum assembly mounted to the frame. A first rope is joined to the drum assembly and to the longitudinal mast to pull the longitudinal section in a first direction, while a second rope is joined to the drum assembly and to the longitudinal mast to pull the longitudinal section in a second direction. A sensor is operably coupled to the drive assembly to sense overload tension in the first rope or the second rope.

Abstract: A telescopic crane jib part has a top profiled part and a bottom profiled part joined together at joining points. The top profiled part and the bottom profiled part, on a side of the cross-section defining one-half of the cross section that is symmetrical with respect to the vertical mid-plane, each comprise, starting from the joining point of the profiled parts, at least a less pronounced outwardly curved segment and a more pronounced outwardly curved segment. Mutually adjoining end segments of the top and bottom profile parts meet at the joining points and extend outwards forming an angle.

Abstract: Embodiments of a method and apparatus to lift payloads onto or into a vehicle are disclosed. Optimal embodiments of the device mount to a plurality of receiver hitches on a vehicle and combine optimally shaped and positioned structures, rigid and flexible linkage, and a pivoting tower to form a lifting hoist that is foldable, retractable, and can be recoverably installed. A prominent feature of the present invention is the ability to retract to a stored position that does not interfere with other features or functions of the host vehicle. This invention includes components that make it safe to use on un-level surfaces and other components and methods that enable the apparatus to be leveled to some extent before use.

Abstract: The present disclosure relates to a mobile crane comprising a superstructure having a revolving deck and at which a preferably telescopic boom is pivotably arranged around a pivot point, with a winch being additionally present for the hoist rope. In accordance with the present disclosure, the winch is arranged beneath the pivot point of the telescopic boom in the revolving deck.

Abstract: An extension assembly is provided that comprises spaced apart first and second extension beams, which are removeablely and independently affixed to a deck of a vessel. At least a portion the first and second extension beams extend beyond the transom of the vessel. The assembly further includes a modular traverse beam removeablely affixed to the first and second extension beams along a substantially perpendicular direction. The modular traverse beam is adapted to receive a work-over rig.

Abstract: A foldable portable hoist system includes a foldable portable hoist assembly and a mounting base. The foldable portable hoist assembly includes a substantially vertical support, an upper support arm, and a diagonal brace assembly. Hinged attachment of slidable collars on either end of the diagonal brace enables the foldable portable hoist assembly to be folded up for ease of transport and storage.

Abstract: An upper cross-sectional part for a telescopic part of a crane comprises a central flat cross-sectional element and, connected to the central flat cross-sectional element on each side thereof, a first outwardly curved cross-sectional element; a second flat cross-sectional element; a second outwardly curved cross-sectional element; and a third flat cross-sectional element.

Abstract: An extendable arm that extends from a police vehicle towards a pulled over vehicle. The arm allows for two-way communication or document transfer. The police officer can position the extendable arm while seated in the vehicle. The extendable arm includes a main shaft having first and second opposed ends. The first end is pivotally attached to the vehicle. A telescoping assembly extends from the second end. The assembly has a free end that extends and retracts away from and towards the main shaft. The free end can have an accessory mounted thereon, such as a two-way audio visual camera, or a container for the retention of driver's licenses. During operation the distal end can be positioned adjacent the driver's window or the police officer's window. The free end is retracted, and the shaft is placed in a stowed position adjacent the motor vehicle when not in use.

Abstract: The within invention concerns a telescopic boom of a crane with a pivot section, telescopic sections that can telescope out of the pivot section, and a guying that has at least one guy stand housed to pivot on one of the sections, and at least one guy cable supported by the guy stand, as well as erection mechanisms for raising the support stand out of folded transportation position into raised operating position. According to the invention, the telescopic boom is characterized by the fact that the erection mechanism consists of a tension rod that connects the guy stand with an internal telescopic section that can telescope outward opposite the section on which the guy stand is housed to pivot.

Abstract: A mobile crane includes an under carriage, a superstructure that is rotatably mounted on the superstructure, and a main boom, which is composed of a base body and several telescopic lengths up to a predetermined maximum number, which slide into one another and can be extended from the base body. The main boom is mounted on the superstructure so that it can rotate about a horizontal axis and its inclination can be adjusted by means of a hydraulic tilting cylinder that is hinged on the superstructure and the base body. A maximum permissible weight is predefined for the main boom, as a result of a restriction on the permissible axle load of the mobile crane during road haulage. The crane is also provided with a lifting capacity increasing device, which significantly increases the lifting capacity of the main boom when the telescopic lengths are extended, in relation to the state without the lifting capacity increasing device.

Abstract: A telescopic crane, includes a substructure, a superstructure rotatably mounted onto the substructure, a counterweight and a telescoping boom structure which includes a main boom slewable about a luffing plane. The main boom has a boom base and at least one telescope section received in the boom base and displaceable between retracted and extended positions. At least one guy support is mounted to the boom structure and connected to a guy rope which extends substantially longitudinally in the direction of the boom structure. The guy support is oriented with respect to the luffing plane at an inclination which is so selected that a lateral load acting on the boom structure is partially or entirely received by the guying.

Abstract: A portable winch suitable for use in underground pipe bursting and replacement includes a mounting frame positionable at a top opening of a hole such as a receiving pit or manhole. A telescoping mast having a series of nested, top and bottom mast sections is mounted on the frame. A powered winch unit, also mounted on the frame, includes a drive unit and a cable. A guide assembly includes a sheave that guides the cable from the drive unit to the bottom mast section. Suitable means are connected to the frame for mechanically raising and lowering the mast into and out of the hole. As such, the mast according to the invention does not require assembly or disassembly at the beginning and end of each job. The mechanical means for raising and lowering the mast is preferably the powered winch unit.

Abstract: This tape cartridge is provided with a tape reel being rotatable and having a reel teeth portion; and a brake-locking member having a brake teeth portion in which mating operation and mate-releasing operation can be performed with respect to the reel teeth portion. The reel teeth portion and the brake teeth portion, each has plural teeth. Each of the teeth has a taper portion being inclined toward both sides from a tip part of the taper portion and a vertical portion extending in a substantially vertical manner from both end terminals of the taper portion to a base portion. At the time of the mating, the tip part is contacted with a bottom surface of the base portion at the side of the opposite teeth, and the vertical portion is opposed to the vertical portion at the side of the opposite teeth. At the time of mating, the vertical portions of the teeth are mutually contacted and the mating state is hard to become unfitted.

Abstract: A telescopic jib for a crane, such as a vehicular crane, comprises an upper profile part and a lower profile part joined together. The lower profile part consists of several shell segments, each having an outwardly curved shape, and the upper profile part comprises several outwardly curved shell segments abutting each other at an obtuse angle.

Abstract: The invention relates to a covering body for masts of construction cranes, electricity lines, or the like with an outer covering which is designed to partially or totally encase a mast in the direction of extension and/or peripheral direction and which furthermore has at least one rigid inner support, with which the outer covering can be arranged to be spaced at least partially at a distance from the mast. Finally, a fastening device for fastening the inner support to the mast is provided. Such a covering body according to the invention is further developed in that the inner support, by means of the fastening device, can be connected to the mast rotatably adjustable in the peripheral direction and/or adjustable in the direction of extension and that a device for active and/or passive variation of position and/or geometry of the outer covering is provided.

Abstract: A telescopic boom (1) for a vehicle (25) or a hoist with a storage rack (6) for at least two box girders (2, 3) guided displaceably in one another in the direction of their longitudinal axes, which are mounted to pivot about a horizontal pivot axle (5) in the storage rack (6) and which can be displaced reciprocally by means of a servo-drive (19) is described. In order to create advantageous structural conditions it is proposed that the longitudinal axles of the box girders (2, 3) form an upwards arched arc of a circle (4) which runs concentrically to a common axis parallel to the pivot axis (5).

Abstract: A method of detecting damage to a structural member which is part of a working arm of a working apparatus, which arm is moveable relative to a body of the apparatus by an actuator. In use, the arm carries a load at another end thereof. The method including the steps of locating in or on the structural member in a position which is liable to damage, at least one filament. So long as the filament remains undamaged, a signal is transmitted along the length of the filament. In the event of an interruption of the transmitted signal, a fault signal is generated. The fault signal is used to disable operation of the actuator. The method is particularly useful for working arms made from light weight composite materials in the form of a matrix of fibers in a resin material which is susceptible to impact damage which may not be visible.

Abstract: A slide arm for a work implement is provided, which is simply structured to obtain improved assembling precision thereby ensuring smooth operation. To this end, the slide arm is such that a plurality of tubular structural bodies (i.e., outer and inner tubes), each of which is formed by bending a one-piece plate into a shape having a substantially triangular cross-section and circular vertex portions, are telescoped one within the other with sliding members (i.e., plain bearing units and slide block pieces) interposed between them at the vertex portions and such that a sliding mechanism is disposed for sliding the tubular structural bodies.

Abstract: The invention relates to a telescopic boom for a vehicle crane, comprising a base housing (1), which may be mounted to an upper construction on the vehicle crane in a horizontal joint (2), at the lower end thereof and has further horizontal joint (3), to which a tipping cylinder, for inclination of the telescopic boom, which may be connected to the upper construction, may be connected and several telescopic stages (4-11), running either in each other or in the base housing (1), all of which may be telescoped by means of a telescoping device (12) directly connected thereto and which may be locked relative to each other in the telescoped position. One of the telescoping stages (4-11) is embodied from two part pieces (4a, b) may be locked together by stage (4), and both part pieces (4a, b) are pivoted together by means of a hinge.

Abstract: The within invention concerns a telescopic boom of a crane with a pivot section, telescoping sections that telescope out of the pivot section, and bracing that has at least one guy support housed on one of the sections and a guy cable supported on one of these guy supports. According to the invention, the telescopic crane is characterized by the presence of a guy cable running from the guy support and a cable lock that can be locked to said guy cable, in which the cable lock can be moved by means of an actuator, particularly an hydraulic cylinder, in the longitudinal direction of the guy and the guy cable can be pre-stressed by moving the cable lock.