US20220009752A1 - Dismantlable lattice piece for crane boom - Google Patents
Dismantlable lattice piece for crane boom Download PDFInfo
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- US20220009752A1 US20220009752A1 US17/370,964 US202117370964A US2022009752A1 US 20220009752 A1 US20220009752 A1 US 20220009752A1 US 202117370964 A US202117370964 A US 202117370964A US 2022009752 A1 US2022009752 A1 US 2022009752A1
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- 239000002184 metal Substances 0.000 claims description 2
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- 238000010276 construction Methods 0.000 description 4
- 230000006835 compression Effects 0.000 description 3
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- 238000009434 installation Methods 0.000 description 3
- 230000006641 stabilisation Effects 0.000 description 3
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/62—Constructional features or details
- B66C23/64—Jibs
- B66C23/70—Jibs constructed of sections adapted to be assembled to form jibs or various lengths
Definitions
- the disclosure relates to a dismantlable lattice piece for a crane boom.
- Non-dismantlable parallelepiped-shaped lattice pieces that are used for lattice mast cranes generally have a width of 3 to 4 meters since these dimensions represent typical limit values for an economic transport of the lattice pieces.
- a larger lattice piece width is desirable, however, with respect to the achievable stiffness of the crane boom since the resulting area moment of inertia of the lattice piece due to the large width of the lattice piece increases and the deformation of the boom to the side is reduced.
- the object of the present disclosure comprises showing an alternative solution for a dismantlable lattice piece that has economically sensible transport dimensions, but that can be set up as quickly and in as uncomplicated manner as possible to form a large lattice piece.
- Each lateral corner bar part in particular a lateral corner bar plate, comprises at least two corner bars that are fixedly welded to one another by means of a plurality of connection bars and thus form an independent support structure.
- These individual lateral corner bar parts can be stacked onto one another for transport and can therefore be transported to the deployment site in a particularly space-saving manner.
- the transverse connection is gibbed to the two lateral corner bar parts for this purpose.
- the lattice piece In its assembled work configuration, the lattice piece is considerably larger than the economic transport dimensions and those that are permitted in some countries.
- the lattice piece can, however, be simply dismantled for road transport in that the two lateral corner bar parts are separated from one another by the release of the gib connection to the transverse connection.
- the lateral corner bar parts are specifically rotated by 90 degrees about their longitudinal axes after the release of the gib connection so that they can be stacked onto one another.
- the transverse connection or its individual parts can be stored on or between the stacked lateral corner bar parts.
- the total lattice piece does not exceed the permitted transport widths and transport heights in the dismantled transport state.
- the height of the lateral corner bar parts, or the distance of the corner bars from one another is within the transport width.
- the individual parts of a dismantled lattice piece may form a transport unit in the transport state.
- the transverse connection for example, comprises a plurality of diagonal bars gibbable with the lateral corner bar parts.
- the diagonal bars can be gibbed to the corner bars of the lateral corner bar parts at the end sides.
- the transverse connection can also have at least two planar lattice plates gibbed to the lateral corner bar parts in a perpendicular manner. These lattice plates form side surfaces of the assembled lattice pieces. Each of these lattice plates can be gibbed to the end regions of the lateral corner bar parts. The lattice plates can either be removed or folded onto the lateral corner bar part for transport due to the gibbing. The outer contour of the lattice piece is consequently formed by both lateral corner bar parts and both lattice plates.
- Each of these lattice plates can, for example, comprise two parallel longitudinal beams that are connected, in particular fixedly welded, to one another via diagonal bars and/or posts.
- connection consoles serve the mutual fixing of individual lateral corner bar parts stacked onto one another during transport.
- a connection console can be arranged at a corner bar of the lateral corner bar parts, in particular welded in a manner projecting perpendicularly.
- At least two connection consoles can be provided per lateral corner bar part or per corner bar.
- the connection consoles can be configured as so-called twistlock consoles that are already known from the container sector.
- the at least two lateral corner bar parts can also be configured as spatial lateral corner bar parts.
- the spatial extent is achieved by a respective four corner bars that are connected to one another by means of suitable connection beams, in particular posts and/or diagonals, to form a spatial parallelepiped-shaped construction.
- the lateral corner bar parts are accordingly themselves designed as narrow, conventionally set up lattice pieces.
- the corner bars are here fixedly welded to one another by means of the connection beams. Directly adjacent corner bars, or corner bars disposed in a common plane, can be fixedly welded to one another by connection beams, or diagonal beams and/or posts.
- the two spatial lateral corner bar parts can be gibbed or gibbable to one another by an x-shaped transverse connection.
- the x-shaped transverse connection can be formed by a pair of interesting diagonal beams in accordance with an embodiment, with the diagonal beams being connected to one another at the point of intersection. They may intersect centrally at approximately half the distance between the connected lateral corner bar parts.
- Such an x-shaped transverse connection serves the increase of the torsion resistance of the lattice piece.
- the torsion resistance with respect to two individual unconnected lateral corner bar parts is considerably increased by the diagonal connections of the x-shaped transverse connection.
- the diagonals of the x-shaped transverse connection here prevent the twisting and displacement of the two lateral corner bar parts toward one another (the diagonals take up tension and compression here.
- a plurality of such pairs of intersecting diagonal bars are used for the x-shaped transverse connection. These pairs can be disposed in parallel with one another between the lateral corner bar parts to be connected. Adjacent pairs of intersecting diagonal bars can be fixedly welded to one another via one or more bars.
- the diagonal connections can here be designed as planar framework.
- the kink length of an individual narrow lateral corner bar part corresponds to the total lattice piece length.
- Embodiments of the lateral corner bar part is rigid in compression over the complete lattice piece length due to the framework designed as a conventional lattice piece.
- the intersecting diagonal bars are pivotable with respect to one another about at least one pivot axis at the point of intersection.
- the at least one pivot axis is in particular transverse to the longitudinal direction of the diagonal bars. It is possible due to the pivot axis to fold the x-shaped transverse connection for the transport path in a space saving manner, in particular such that the diagonal bars are disposed almost in parallel with one another, or contact one another.
- the two spatial lateral corner bar parts can be connected to one another by means of one or more lattice plates.
- the lattice plates can be gibbed to the lateral corner bar parts at the end sides.
- the lattice plates can here, as already stated above, also be assembled from two parallel longitudinal beams that are fixedly welded to one another by means of diagonal bars and/or posts.
- the lattice plates gibbed to the end regions of the lateral corner bar parts form the outer contour of the resulting lattice piece together with the lateral corner bar parts.
- the ends of the x-shaped transverse connection can be connected, or gibbed, to the end regions of the lattice plates or of the corner bar plates.
- the lattice plates can be pivotably gibbed to at least one lateral corner bar part.
- the lattice plates can thereby also be folded onto the corresponding lateral corner bar parts in a space saving manner for transport purposes.
- a further aspect of the disclosure that applies both to the design of the lateral corner bar parts as spatial lateral corner bar parts and to the design as non-spatial lateral corner bar parts is that the working height of a lattice piece substantially corresponds to the transport width of a transport unit formed from the individual parts of the lattice piece.
- a plurality of dismantled individual parts such as the lateral corner parts, transverse connections, and/or lattice plates are stacked onto one another or are folded onto one another in a space-saving manner to form a transport unit.
- a transport unit may comprise all the individual parts of the dismantled lattice piece.
- the lateral corner bar parts are rotated by 90° about the longitudinal axis of a corner bar with respect to the assembly/disassembly orientation to form the transport unit. This has the effect that the height of the assembled lattice piece corresponds to the transport width of the transport unit in operation.
- the lateral corner bar parts are rotated by 90° about the longitudinal axis of a corner bar out of the position in the transport unit into the required installation position.
- the gibbing in the transport state may take place at the aforesaid connection consoles or twistlock consoles. This allows an inexpensive connection of the lateral corner bar parts and of the center latticing 40 . Said consoles can also be used to stack a plurality of lattice pieces.
- the present disclosure equally relates, in addition to the lattice piece, to a crane, in particular to a mobile crane, having at least one lattice piece.
- the crane may comprise a tower and/or a lattice boom that is assembled from a plurality of the lattice pieces.
- the crane is accordingly characterized by the same advantages and properties as the lattice piece; reference is made to the above statements to avoid repetition.
- a method of installing a lattice piece is also disclosed.
- a transport takes place of at least the lateral corner bar parts, or all the individual components of the lattice pieces, stacked onto one another.
- the installation of the lattice piece then takes place with the following method steps at the deployment site:
- a lateral corner bar part Erection of a lateral corner bar part from the transport position by setting up, or by rotation by 90 degrees about its longitudinal axis, and fixing the lateral corner bar part to a set up assembly frame or assembly console.
- the lateral corner bar part lies on a corner bar over the length of the corner bar on the ground or is fixed, for example gibbed, in the assembly console, in particular close to the ground.
- the second lateral corner bar part is erected in an analog manner and is connected to the assembly frame and/or to the assembly console.
- the two lateral corner bar parts can thus be aligned at a fixedly defined distance from one another by the assembly frame, said distance in particular being coordinated with the dimension of the lattice plates.
- the assembly or the unfolding of the first lattice plate and the connection or gibbing of the lattice plate to the oppositely disposed lateral corner bar part takes place next. Since the distance of the two lateral corner bar parts was previously defined by means of the assembly frame, the at least one lattice plate and the lateral corner bar parts are immediately in the gibbed position. After the gibbing, at least one diagonal bar connecting the lateral corner bar parts are used for their stabilization.
- the second lattice plate can subsequently be unfolded or assembled and gibbed with the oppositely disposed lateral corner bar part.
- the individual lattice plates can either be completely dismantled from the lateral corner bar parts or they remain gibbed to at least one lateral corner bar part and are instead folded onto the lateral corner bar part about the existing gib connection for transport purposes.
- an assembly of all the diagonal bars connecting the two lateral corner bar parts to one another can take place after the assembly of the second lattice plate. All the diagonal bars can be first inserted between the two corner bars lying on the ground or being close to the ground. The assembly of the diagonal bars for the connection of the two upwardly disposed corner bars of the individual lateral corner bar parts can then subsequently take place. After the assembly of all the diagonal bars, a metal gangway can optionally be placed onto the diagonal bars.
- the assembly routine is similar with slight differences. Individual components of the lattice piece are here likewise stacked onto one another for transport purposes.
- the setting up of the x-shaped transverse bracing then takes place by rotation by 90 degrees about its longitudinal axis.
- the individual lattice plates gibbed to the x-shaped transverse strut connection can now be unfolded.
- the first and second lateral corner bar parts can be set up by 90 degrees after one another and can be gibbed to the x-shaped transverse strut connection.
- FIGS. 1 a -1 d depict different perspective representations of the lattice piece in accordance with a first embodiment
- FIGS. 2 a , 2 b , 2 c depict three representations of the stacked part components of the dismantled lattice piece in accordance with FIGS. 1 a - 1 d;
- FIGS. 3 a to 3 d depict a chronological representation of the required assembly steps for the assembly of the lattice piece in accordance with FIGS. 1 a to 1 d;
- FIGS. 4 a -4 c depict different perspective representations of the lattice piece in accordance with the invention in accordance with a second embodiment
- FIGS. 5 a , 5 b depict two representations of the stacked part components of the dismantled lattice piece in accordance with FIGS. 4 a -4 c ;
- FIGS. 6 a to 6 d depict a chronological representation of the required assembly steps for the assembly of the lattice piece in accordance with FIGS. 4 a to 4 c.
- FIGS. 1 a -6 d are shown approximately to scale.
- FIGS. 1 to 3 relate to a first embodiment variant of the lattice piece.
- a lattice piece 1 comprises two individual lateral corner bar parts 2 or lateral corner bar plates 2 that are connected by individual diagonals 4 and planar perpendicular lattice plates 3 .
- FIG. 1 a shows a perspective lateral representation of the lattice piece 1 ;
- FIG. 1 b a side view of the lattice piece 1 ;
- FIG. 1 c a plan view of the lattice piece 1 ;
- FIG. 1 d a front-side view of the lattice piece 1 .
- Each lateral corner bar part 2 comprises two corner bars 5 each having polygonal or oval corner bar cross-sections.
- the two corner bars 5 are fixedly welded to one another via a respective perpendicular post 6 .
- the diagonal bars 7 arranged between the two posts 6 and connecting the corner bars 5 are also fixedly welded to the corner bars 5 .
- Connection elements 8 for finger-fork connections are located at the ends of the corner bars 5 to be able to assemble the lattice pieces for setting up the crane or crane boom.
- the two lateral corner bar parts are connected to one another via a releasable transverse connection to form the shape of the assembled lattice piece in accordance with FIG. 1 a .
- the transverse connection comprises a plurality of diagonal bars 4 and planar perpendicular lattice plates 3 .
- the oppositely disposed corner bars 5 of the lateral corner bar parts 2 are connected via respective diagonal bars 4 a and 4 b , with the diagonal bars of the corner bars 5 disposed at the top in the drawing being marked by reference numerals 4 a and the lower diagonal bars for connecting the corner bars 5 disposed at the bottom being marked by reference numeral 4 b .
- the diagonal bars are gibbed to gib mounts 5 a .
- the gib mount 5 a can, as shown, be on the corner bar 5 , but alternatively also on the fork 8 or on the post 6 .
- the planar lattice plates 3 each comprise two longitudinal beams 9 that extend in parallel and that are fixedly welded to one another via a respective transverse bar 10 and diagonal bars 11 arranged therebetween.
- the ends of the longitudinal beams 9 can likewise be gibbed to matching gib mounts 5 a of the corner bars 5 .
- the lattice plates 3 remain gibbed to a lateral corner bar part 2 for the transport and are folded onto it around the existing gib connection.
- the lateral corner bar parts 2 have connection consoles 12 , or twistlock consoles (so-called “container corners”), with which the lateral corner bar parts 2 can be stacked onto one another and connected to one another for an efficient transport.
- the connection here may take place using twistlocks that are also used for connecting ocean containers. This is shown in FIG. 2 b.
- the transport width b Transport of the lattice piece 2 in the transport state corresponds to the lattice height in the operating state.
- the components remain within the permitted transport dimensions in the transport state. This can be seen in FIG. 2 a that shows two lateral corner bar parts 2 stacked onto one another. The distance between the two corner bars 5 of a lateral corner bar part 2 extending in parallel is marked by the transport width b Transport here.
- the starting point is the transport state in accordance with FIG. 2 c ; a plurality of lateral corner bar parts 2 are stacked onto one another and connected by twistlocks at the consoles 12 present at the corner bar 5 therein.
- the setting up of an assembly frame 20 and the connection of the assembly frame 20 to the ballast weight 21 for the stabilization of the assembly frame 20 take place first.
- Individual assembly consoles 2 are furthermore set up disposed opposite the assembly frame 20 .
- a lateral corner bar part 2 is then first set up by a 90° rotation about its longitudinal axis and connected to the assembly frame 20 and to an assembly console 22 (see FIG. 3 a ).
- the setting up of a second lateral corner bar part 2 follows, likewise by a 90° rotation about its longitudinal axis (see FIG. 3 b ).
- the second lateral corner bar part 2 is also connected to the assembly frame 20 and to a further assembly console 22 and its position is thereby stabilized.
- the assembly frame 20 defines the distance between the lateral corner bar parts 2 here.
- the first lattice plate 3 can subsequently be unfolded and gibbed to the second lateral corner bar part 2 (see FIG. 3 b ). At least one of the lower diagonal bars 4 b is next inserted with the aid of an auxiliary crane and is gibbed to both side parts to achieve a stabilization of the lateral corner bar parts 2 .
- the second lattice plate 3 is unfolded and is connected to the first lateral corner bar part 2 (see FIG. 3 c ). Then, the remaining lower diagonal bars 4 a can first be inserted between the lateral corner bar parts 2 and then the upper diagonal bars 4 a . Finally, the gangway 13 can be placed onto the upper diagonal bars 4 a and the assembled lattice piece 2 can be raised out of the assembly frame 20 , 22 (see FIG. 3 d ).
- the described steps are carried out in reverse order for the dismantling of the lattice piece.
- Dismantlable lattice piece 1 that has larger dimensions in the working configuration than in the economic (and in some countries permitted) transport dimensions in road transport.
- the consoles 12 can be used for stacking a plurality of lattice pieces 1 .
- FIGS. 4 to 6 A second embodiment variant of the lattice piece is shown in FIGS. 4 to 6 . Unlike the first embodiment, this variant comprises two individual spatial lateral corner bar parts 30 that are each designed as lattice pieces. The two lateral corner bar parts 30 are connected by a dismantlable x-shaped transverse connection 40 .
- FIG. 4 a shows a perspective lateral representation of the lattice piece 100 ;
- FIG. 4 b a side view of the lattice piece 30 ;
- FIG. 4 c a top view of the lattice piece 100 .
- Each lateral corner bar part 30 comprises four corner bars 31 , with their spatial arrangement forming a parallelepiped. Adjacent corner bars 31 are fixedly welded by means of a plurality of diagonal bars 32 ; the more spaced apart corner bars 31 , here the upper and lower corner bars, are additionally connected at the end sides by means of perpendicular posts 33 . Connection elements 34 for finger-fork connections are in turn located at the ends of the corner bars 31 .
- the two lateral corner bar parts 30 are connected to one another via a dismantlable or foldable x-shaped transverse connection 40 that is formed by two pairs 41 , 42 of intersecting diagonal bars 43 , 44 .
- the ends of the diagonal bars 43 , 44 are gibbed to the corner bars 31 via gib mounts 35 thereon
- Each pair 41 , 42 comprises a continuous diagonal bar 43 and a diagonal bar 44 divided into two.
- the individual bars of the diagonal bar 44 are each connected in an articulated manner to the continuous diagonal bar 43 pivotable about axes of rotation D 1 , D 2 .
- Two respective ends of the diagonal bars 43 , 44 are connected to one another via a planar lattice plate 50 , with the lattice plate 50 being set up analogously to the lattice plate 3 of the first embodiment of the lattice piece 1 .
- the ends of the longitudinal beams of the lattice plate 50 are pivotably connected to the diagonal bars 43 , 44 and to the gib mounts 35 of the corner bars 31 so that the overall construction of the x-shaped transverse connection 40 can be folded together with the lattice plates 50 in a space-saving manner.
- All the components of the lattice piece 100 can be stacked onto one another for transport as is shown in FIGS. 5 a , 5 b .
- the same advantages with respect to the transport width are also achieved as have already been shown with reference to the first embodiment.
- the center X-shaped latticing 40 (diagonal bars 43 , 44 , including the lattice plates 50 ) is set up in a first step for the assembly by a 90° rotation about its longitudinal axis and is fixed in an assembly frame 60 that permits a perpendicular assembly (see FIG. 6 a ).
- the first foldable lattice plate 50 of the center latticing 40 can be unfolded about the center axis of rotation D 1 on the assembly frame 60 (see FIG. 6 b ).
- the second foldable lattice plate 50 of the center latticing 40 is then unfolded about the center axis of rotation D 2 on the assembly frame 60 (see FIG. 6 c ).
- the first lateral corner bar part 30 can subsequently be set up by a 90° rotation about its longitudinal axis and can be gibbed to the center latticing 40 . This is done analogously for the second lateral corner bar part 30 (see FIG. 6 d ).
- the required rotation of the lateral corner bar parts about their longitudinal axes takes place by means of an auxiliary crane that can take up the parts 30 via suitably arranged attachment eyes.
- FIGS. 1 a -6 d show example configurations with relative positioning of the various components. If shown directly contacting each other, or directly coupled, then such elements may be referred to as directly contacting or directly coupled, respectively, at least in one example. Similarly, elements shown contiguous or adjacent to one another may be contiguous or adjacent to each other, respectively, at least in one example. As an example, components laying in face-sharing contact with each other may be referred to as in face-sharing contact. As another example, elements positioned apart from each other with only a space there-between and no other components may be referred to as such, in at least one example.
- top/bottom, upper/lower, above/below may be relative to a vertical axis of the figures and used to describe positioning of elements of the figures relative to one another.
- elements shown above other elements are positioned vertically above the other elements, in one example.
- shapes of the elements depicted within the figures may be referred to as having those shapes (e.g., such as being circular, straight, planar, curved, rounded, chamfered, angled, or the like).
- elements shown intersecting one another may be referred to as intersecting elements or intersecting one another, in at least one example.
- an element shown within another element or shown outside of another element may be referred as such, in one example.
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Abstract
Description
- The present application claims priority to German Patent Application No. 10 2020 118 256.2 filed on Jul. 10, 2020. The entire contents of the above-listed application is hereby incorporated by reference for all purposes.
- The disclosure relates to a dismantlable lattice piece for a crane boom.
- Non-dismantlable parallelepiped-shaped lattice pieces that are used for lattice mast cranes generally have a width of 3 to 4 meters since these dimensions represent typical limit values for an economic transport of the lattice pieces. A larger lattice piece width is desirable, however, with respect to the achievable stiffness of the crane boom since the resulting area moment of inertia of the lattice piece due to the large width of the lattice piece increases and the deformation of the boom to the side is reduced.
- Solutions are therefore being sought for large cranes to be able to use stiff lattice pieces that are as large as possible and that have width dimensions greater than the aforesaid 4 meters, but that can nevertheless be transported in an economically sensible manner. Partial solutions have already emerged that in particular propose separable lattice pieces. Such lattice pieces comprise individual bars that can be gibbed to one another for the construction of the lattice piece. Lattice pieces are also known that comprise two individual segments, with each individual segment representing a spatial support structure. These individual elements are then connected to one another via diagonal tubes. Both solution variants are, however, in need of optimization with respect to the transport and also with respect to a fast construction.
- The design of cranes with parallel crane towers is also known as an alternative to the increase in size of the lattice pieces.
- The object of the present disclosure comprises showing an alternative solution for a dismantlable lattice piece that has economically sensible transport dimensions, but that can be set up as quickly and in as uncomplicated manner as possible to form a large lattice piece.
- It is proposed in accordance with the disclosure to assemble such a lattice piece from two lateral corner bar parts. Each lateral corner bar part, in particular a lateral corner bar plate, comprises at least two corner bars that are fixedly welded to one another by means of a plurality of connection bars and thus form an independent support structure. These individual lateral corner bar parts can be stacked onto one another for transport and can therefore be transported to the deployment site in a particularly space-saving manner. It is only necessary for the assembly of the lattice piece to put together the at least two lateral corner bar parts by means of the transverse connection expressly provided for this purpose. The transverse connection is gibbed to the two lateral corner bar parts for this purpose.
- In its assembled work configuration, the lattice piece is considerably larger than the economic transport dimensions and those that are permitted in some countries. The lattice piece can, however, be simply dismantled for road transport in that the two lateral corner bar parts are separated from one another by the release of the gib connection to the transverse connection. The lateral corner bar parts are specifically rotated by 90 degrees about their longitudinal axes after the release of the gib connection so that they can be stacked onto one another. The transverse connection or its individual parts can be stored on or between the stacked lateral corner bar parts. The total lattice piece does not exceed the permitted transport widths and transport heights in the dismantled transport state. Thus, the height of the lateral corner bar parts, or the distance of the corner bars from one another, is within the transport width. The individual parts of a dismantled lattice piece may form a transport unit in the transport state.
- The transverse connection, for example, comprises a plurality of diagonal bars gibbable with the lateral corner bar parts. The diagonal bars can be gibbed to the corner bars of the lateral corner bar parts at the end sides.
- Additionally or also alternatively, the transverse connection can also have at least two planar lattice plates gibbed to the lateral corner bar parts in a perpendicular manner. These lattice plates form side surfaces of the assembled lattice pieces. Each of these lattice plates can be gibbed to the end regions of the lateral corner bar parts. The lattice plates can either be removed or folded onto the lateral corner bar part for transport due to the gibbing. The outer contour of the lattice piece is consequently formed by both lateral corner bar parts and both lattice plates. Each of these lattice plates can, for example, comprise two parallel longitudinal beams that are connected, in particular fixedly welded, to one another via diagonal bars and/or posts.
- The lateral corner bar parts themselves can be configured with at least one connection console. Such a connection console serves the mutual fixing of individual lateral corner bar parts stacked onto one another during transport. Such a connection console can be arranged at a corner bar of the lateral corner bar parts, in particular welded in a manner projecting perpendicularly. At least two connection consoles can be provided per lateral corner bar part or per corner bar. The connection consoles can be configured as so-called twistlock consoles that are already known from the container sector.
- In accordance with a further embodiment of the disclosure, the at least two lateral corner bar parts can also be configured as spatial lateral corner bar parts. The spatial extent is achieved by a respective four corner bars that are connected to one another by means of suitable connection beams, in particular posts and/or diagonals, to form a spatial parallelepiped-shaped construction. The lateral corner bar parts are accordingly themselves designed as narrow, conventionally set up lattice pieces. The corner bars are here fixedly welded to one another by means of the connection beams. Directly adjacent corner bars, or corner bars disposed in a common plane, can be fixedly welded to one another by connection beams, or diagonal beams and/or posts.
- The two spatial lateral corner bar parts can be gibbed or gibbable to one another by an x-shaped transverse connection. The x-shaped transverse connection can be formed by a pair of interesting diagonal beams in accordance with an embodiment, with the diagonal beams being connected to one another at the point of intersection. They may intersect centrally at approximately half the distance between the connected lateral corner bar parts. Such an x-shaped transverse connection serves the increase of the torsion resistance of the lattice piece. The torsion resistance with respect to two individual unconnected lateral corner bar parts is considerably increased by the diagonal connections of the x-shaped transverse connection. The diagonals of the x-shaped transverse connection here prevent the twisting and displacement of the two lateral corner bar parts toward one another (the diagonals take up tension and compression here.
- It is likewise conceivable that a plurality of such pairs of intersecting diagonal bars are used for the x-shaped transverse connection. These pairs can be disposed in parallel with one another between the lateral corner bar parts to be connected. Adjacent pairs of intersecting diagonal bars can be fixedly welded to one another via one or more bars. The diagonal connections can here be designed as planar framework. The kink length of an individual narrow lateral corner bar part corresponds to the total lattice piece length. Embodiments of the lateral corner bar part is rigid in compression over the complete lattice piece length due to the framework designed as a conventional lattice piece.
- In accordance with an embodiment, the intersecting diagonal bars are pivotable with respect to one another about at least one pivot axis at the point of intersection. The at least one pivot axis is in particular transverse to the longitudinal direction of the diagonal bars. It is possible due to the pivot axis to fold the x-shaped transverse connection for the transport path in a space saving manner, in particular such that the diagonal bars are disposed almost in parallel with one another, or contact one another.
- In addition to this x-shaped transverse connection, the two spatial lateral corner bar parts can be connected to one another by means of one or more lattice plates. The lattice plates can be gibbed to the lateral corner bar parts at the end sides. The lattice plates can here, as already stated above, also be assembled from two parallel longitudinal beams that are fixedly welded to one another by means of diagonal bars and/or posts. The lattice plates gibbed to the end regions of the lateral corner bar parts form the outer contour of the resulting lattice piece together with the lateral corner bar parts. The ends of the x-shaped transverse connection can be connected, or gibbed, to the end regions of the lattice plates or of the corner bar plates.
- The lattice plates can be pivotably gibbed to at least one lateral corner bar part. The lattice plates can thereby also be folded onto the corresponding lateral corner bar parts in a space saving manner for transport purposes.
- A further aspect of the disclosure that applies both to the design of the lateral corner bar parts as spatial lateral corner bar parts and to the design as non-spatial lateral corner bar parts is that the working height of a lattice piece substantially corresponds to the transport width of a transport unit formed from the individual parts of the lattice piece. A plurality of dismantled individual parts such as the lateral corner parts, transverse connections, and/or lattice plates are stacked onto one another or are folded onto one another in a space-saving manner to form a transport unit. A transport unit may comprise all the individual parts of the dismantled lattice piece. The lateral corner bar parts are rotated by 90° about the longitudinal axis of a corner bar with respect to the assembly/disassembly orientation to form the transport unit. This has the effect that the height of the assembled lattice piece corresponds to the transport width of the transport unit in operation. For the installation procedure, the lateral corner bar parts are rotated by 90° about the longitudinal axis of a corner bar out of the position in the transport unit into the required installation position.
- The gibbing in the transport state may take place at the aforesaid connection consoles or twistlock consoles. This allows an inexpensive connection of the lateral corner bar parts and of the
center latticing 40. Said consoles can also be used to stack a plurality of lattice pieces. - The present disclosure equally relates, in addition to the lattice piece, to a crane, in particular to a mobile crane, having at least one lattice piece. The crane may comprise a tower and/or a lattice boom that is assembled from a plurality of the lattice pieces. The crane is accordingly characterized by the same advantages and properties as the lattice piece; reference is made to the above statements to avoid repetition.
- A method of installing a lattice piece is also disclosed. For an embodiment of the lattice piece having individual diagonal bars that connect the lateral corner bar parts to one another, a transport takes place of at least the lateral corner bar parts, or all the individual components of the lattice pieces, stacked onto one another. The installation of the lattice piece then takes place with the following method steps at the deployment site:
- Erection of a lateral corner bar part from the transport position by setting up, or by rotation by 90 degrees about its longitudinal axis, and fixing the lateral corner bar part to a set up assembly frame or assembly console. In this setup position, the lateral corner bar part lies on a corner bar over the length of the corner bar on the ground or is fixed, for example gibbed, in the assembly console, in particular close to the ground.
- In the following step, the second lateral corner bar part is erected in an analog manner and is connected to the assembly frame and/or to the assembly console. The two lateral corner bar parts can thus be aligned at a fixedly defined distance from one another by the assembly frame, said distance in particular being coordinated with the dimension of the lattice plates.
- The assembly or the unfolding of the first lattice plate and the connection or gibbing of the lattice plate to the oppositely disposed lateral corner bar part takes place next. Since the distance of the two lateral corner bar parts was previously defined by means of the assembly frame, the at least one lattice plate and the lateral corner bar parts are immediately in the gibbed position. After the gibbing, at least one diagonal bar connecting the lateral corner bar parts are used for their stabilization.
- The second lattice plate can subsequently be unfolded or assembled and gibbed with the oppositely disposed lateral corner bar part. As has already been explained above, the individual lattice plates can either be completely dismantled from the lateral corner bar parts or they remain gibbed to at least one lateral corner bar part and are instead folded onto the lateral corner bar part about the existing gib connection for transport purposes.
- In accordance with an embodiment, an assembly of all the diagonal bars connecting the two lateral corner bar parts to one another can take place after the assembly of the second lattice plate. All the diagonal bars can be first inserted between the two corner bars lying on the ground or being close to the ground. The assembly of the diagonal bars for the connection of the two upwardly disposed corner bars of the individual lateral corner bar parts can then subsequently take place. After the assembly of all the diagonal bars, a metal gangway can optionally be placed onto the diagonal bars.
- In an embodiment of the lattice piece with spatial lateral corner bar parts and an x-shaped transverse bracing, the assembly routine is similar with slight differences. Individual components of the lattice piece are here likewise stacked onto one another for transport purposes. In a first step, the setting up of the x-shaped transverse bracing then takes place by rotation by 90 degrees about its longitudinal axis. After the positioning of the x-shaped transverse strut connection on an assembly frame set up on the ground, the individual lattice plates gibbed to the x-shaped transverse strut connection can now be unfolded. Subsequently to this, the first and second lateral corner bar parts can be set up by 90 degrees after one another and can be gibbed to the x-shaped transverse strut connection.
- It should be understood that the summary above is provided to introduce in simplified form a selection of concepts that are further described in the detailed description. It is not meant to identify key or essential features of the claimed subject matter, the scope of which is defined uniquely by the claims that follow the detailed description. Furthermore, the claimed subject matter is not limited to implementations that solve any disadvantages noted above or in any part of this disclosure.
- Further advantages and properties of the disclosure will be explained in more detail in the following with reference to an embodiment shown in the Figures.
-
FIGS. 1a-1d depict different perspective representations of the lattice piece in accordance with a first embodiment; -
FIGS. 2a, 2b, 2c depict three representations of the stacked part components of the dismantled lattice piece in accordance withFIGS. 1a -1 d; -
FIGS. 3a to 3d depict a chronological representation of the required assembly steps for the assembly of the lattice piece in accordance withFIGS. 1a to 1 d; -
FIGS. 4a-4c depict different perspective representations of the lattice piece in accordance with the invention in accordance with a second embodiment; -
FIGS. 5a, 5b depict two representations of the stacked part components of the dismantled lattice piece in accordance withFIGS. 4a-4c ; and -
FIGS. 6a to 6d depict a chronological representation of the required assembly steps for the assembly of the lattice piece in accordance withFIGS. 4a to 4 c. -
FIGS. 1a-6d are shown approximately to scale. -
FIGS. 1 to 3 relate to a first embodiment variant of the lattice piece. Such alattice piece 1 comprises two individual lateralcorner bar parts 2 or lateralcorner bar plates 2 that are connected byindividual diagonals 4 and planarperpendicular lattice plates 3.FIG. 1a shows a perspective lateral representation of thelattice piece 1;FIG. 1b a side view of thelattice piece 1;FIG. 1c a plan view of thelattice piece 1; andFIG. 1d a front-side view of thelattice piece 1. - Each lateral
corner bar part 2 comprises twocorner bars 5 each having polygonal or oval corner bar cross-sections. The twocorner bars 5 are fixedly welded to one another via a respectiveperpendicular post 6. The diagonal bars 7 arranged between the twoposts 6 and connecting the corner bars 5 are also fixedly welded to the corner bars 5.Connection elements 8 for finger-fork connections are located at the ends of the corner bars 5 to be able to assemble the lattice pieces for setting up the crane or crane boom. - The two lateral corner bar parts are connected to one another via a releasable transverse connection to form the shape of the assembled lattice piece in accordance with
FIG. 1a . The transverse connection comprises a plurality ofdiagonal bars 4 and planarperpendicular lattice plates 3. In the embodiment shown, the oppositely disposedcorner bars 5 of the lateralcorner bar parts 2 are connected via respectivediagonal bars 4 a and 4 b, with the diagonal bars of the corner bars 5 disposed at the top in the drawing being marked byreference numerals 4 a and the lower diagonal bars for connecting the corner bars 5 disposed at the bottom being marked by reference numeral 4 b. The diagonal bars are gibbed to gib mounts 5 a. Thegib mount 5 a can, as shown, be on thecorner bar 5, but alternatively also on thefork 8 or on thepost 6. - The
planar lattice plates 3 each comprise twolongitudinal beams 9 that extend in parallel and that are fixedly welded to one another via a respectivetransverse bar 10 anddiagonal bars 11 arranged therebetween. The ends of thelongitudinal beams 9 can likewise be gibbed to matching gib mounts 5 a of the corner bars 5. Thelattice plates 3 remain gibbed to a lateralcorner bar part 2 for the transport and are folded onto it around the existing gib connection. - The lateral
corner bar parts 2 have connection consoles 12, or twistlock consoles (so-called “container corners”), with which the lateralcorner bar parts 2 can be stacked onto one another and connected to one another for an efficient transport. The connection here may take place using twistlocks that are also used for connecting ocean containers. This is shown inFIG. 2 b. - The transport width bTransport of the
lattice piece 2 in the transport state corresponds to the lattice height in the operating state. The components remain within the permitted transport dimensions in the transport state. This can be seen inFIG. 2a that shows two lateralcorner bar parts 2 stacked onto one another. The distance between the twocorner bars 5 of a lateralcorner bar part 2 extending in parallel is marked by the transport width bTransport here. - In the following, the basic assembly routine for the
lattice piece 1 will be described with reference to the illustrations ofFIGS. 3a to 3 d. - The starting point is the transport state in accordance with
FIG. 2c ; a plurality of lateralcorner bar parts 2 are stacked onto one another and connected by twistlocks at theconsoles 12 present at thecorner bar 5 therein. The setting up of anassembly frame 20 and the connection of theassembly frame 20 to theballast weight 21 for the stabilization of theassembly frame 20 take place first. Individual assembly consoles 2 are furthermore set up disposed opposite theassembly frame 20. - A lateral
corner bar part 2 is then first set up by a 90° rotation about its longitudinal axis and connected to theassembly frame 20 and to an assembly console 22 (seeFIG. 3a ). The setting up of a second lateralcorner bar part 2 follows, likewise by a 90° rotation about its longitudinal axis (seeFIG. 3b ). The second lateralcorner bar part 2 is also connected to theassembly frame 20 and to afurther assembly console 22 and its position is thereby stabilized. Theassembly frame 20 defines the distance between the lateralcorner bar parts 2 here. - The
first lattice plate 3 can subsequently be unfolded and gibbed to the second lateral corner bar part 2 (seeFIG. 3b ). At least one of the lower diagonal bars 4 b is next inserted with the aid of an auxiliary crane and is gibbed to both side parts to achieve a stabilization of the lateralcorner bar parts 2. - In the next step, the
second lattice plate 3 is unfolded and is connected to the first lateral corner bar part 2 (seeFIG. 3c ). Then, the remaining lowerdiagonal bars 4 a can first be inserted between the lateralcorner bar parts 2 and then the upperdiagonal bars 4 a. Finally, the gangway 13 can be placed onto the upperdiagonal bars 4 a and the assembledlattice piece 2 can be raised out of theassembly frame 20, 22 (seeFIG. 3d ). - The described steps are carried out in reverse order for the dismantling of the lattice piece.
- The properties of the lattice piece can be summarized as follows:
-
Dismantlable lattice piece 1 that has larger dimensions in the working configuration than in the economic (and in some countries permitted) transport dimensions in road transport. - Two foldable
planar lattice plates 3 for the transverse connection of the two lateralcorner bar parts 2. - Gibbable individual
diagonal bars 4 between the lateralcorner bar parts 2. - Components placed together and rotated by 90° for transport.
- Height of the
lattice piece 1 in the working configuration smaller than a permitted or economic transport width (height in operation=width in transport due to 90° rotation about the longitudinal axis) -
Lattice piece 100 -
- can be transported dismantled into individual parts or
- all the parts can be folded up and transported when stacked onto one another as a single transport unit.
- The gibbing of the individual lateral
corner bar parts 2 of alattice piece 1 at theconsoles 12 in the transport state takes place using “container corners” (twistlock consoles) and twistlocks=>inexpensive connection of the lateral corner bar parts - The
consoles 12 can be used for stacking a plurality oflattice pieces 1. - A second embodiment variant of the lattice piece is shown in
FIGS. 4 to 6 . Unlike the first embodiment, this variant comprises two individual spatial lateralcorner bar parts 30 that are each designed as lattice pieces. The two lateralcorner bar parts 30 are connected by a dismantlable x-shapedtransverse connection 40.FIG. 4a shows a perspective lateral representation of thelattice piece 100;FIG. 4b a side view of thelattice piece 30; andFIG. 4c a top view of thelattice piece 100. - Each lateral
corner bar part 30 comprises fourcorner bars 31, with their spatial arrangement forming a parallelepiped. Adjacent corner bars 31 are fixedly welded by means of a plurality ofdiagonal bars 32; the more spaced apart corner bars 31, here the upper and lower corner bars, are additionally connected at the end sides by means ofperpendicular posts 33.Connection elements 34 for finger-fork connections are in turn located at the ends of the corner bars 31. - The two lateral
corner bar parts 30 are connected to one another via a dismantlable or foldable x-shapedtransverse connection 40 that is formed by twopairs diagonal bars diagonal bars pair diagonal bar 43 and adiagonal bar 44 divided into two. The individual bars of thediagonal bar 44 are each connected in an articulated manner to the continuousdiagonal bar 43 pivotable about axes of rotation D1, D2. Two respective ends of thediagonal bars planar lattice plate 50, with thelattice plate 50 being set up analogously to thelattice plate 3 of the first embodiment of thelattice piece 1. The ends of the longitudinal beams of thelattice plate 50 are pivotably connected to thediagonal bars transverse connection 40 can be folded together with thelattice plates 50 in a space-saving manner. - All the components of the
lattice piece 100 can be stacked onto one another for transport as is shown inFIGS. 5a, 5b . The same advantages with respect to the transport width are also achieved as have already been shown with reference to the first embodiment. - The individual assembly steps for setting up the lattice piece will be explained in the following with reference to the illustrations of
FIGS. 6a to 6d . In this respect, a stack of the individual parts in accordance withFIGS. 5a, 5b is assumed. The connection between the individual parts during the transport may take place here as in the first embodiment variant by means of a twistlock via theconnection elements 36. - The center X-shaped latticing 40 (
diagonal bars assembly frame 60 that permits a perpendicular assembly (seeFIG. 6a ). After the removal of thegangways 51 from the transport position (thegangways 51 are transported either individually or in the folded lattice piece 100), the firstfoldable lattice plate 50 of thecenter latticing 40 can be unfolded about the center axis of rotation D1 on the assembly frame 60 (seeFIG. 6b ). The secondfoldable lattice plate 50 of thecenter latticing 40 is then unfolded about the center axis of rotation D2 on the assembly frame 60 (seeFIG. 6c ). - The first lateral
corner bar part 30 can subsequently be set up by a 90° rotation about its longitudinal axis and can be gibbed to thecenter latticing 40. This is done analogously for the second lateral corner bar part 30 (seeFIG. 6d ). The required rotation of the lateral corner bar parts about their longitudinal axes takes place by means of an auxiliary crane that can take up theparts 30 via suitably arranged attachment eyes. - Finally, the
gangway 51 is placed on again and thelattice piece 100 is removed from theassembly frame 60. - The advantages of the second embodiment variant are comparable with those of the first variant, but will be listed again in the following:
-
-
Dismantlable lattice piece 100 that is larger in the working configuration than in the economic (and in some countries permitted) transport dimensions in road transport. - Two narrow lateral
corner bar part 30 of conventional assembly and comprising fourcorner bars 31, fork-finger connections 34, and weldeddiagonals 32 andposts 33 similar to a P boom or a boom having two towers. - Additionally, central
X-shaped latticing 40 to increase the torsion resistance of thelattice piece 100. - The torsion resistance with respect to two individual unconnected lateral
corner bar parts 30 is considerably increased by the diagonal connections of thecentral latticing 40. The diagonals of thecentral latticing 40 here prevent the twisting and displacement of the two lattice piece towers toward one another (the diagonals take up tension and compression here). - Foldable X-shaped
diagonal connections 40. - The X-shaped
diagonal connections 40 can here be designed as planar framework. - The free distance between two x-shaped diagonals can be approximately as long as the total lattice piece due to the x-shaped latticing. The area moment of inertia about the vertical axis of the lateral corner bar part cross-section therefore has to be so large in order not to kink in operation under pressure load despite the above-described free kink length between two X-shaped diagonals.
- This high area moment of inertia required here about the vertical axis of the lateral corner bar part cross-section is achieved by a spatial design of the lateral corner bar part. That is, an x-shaped checkering requires a very high area moment of inertia of the lateral disk cross-section.
- Embodiments of the X-shaped center latticing as
diagonal connections 40 have to be made for everylattice piece 100. - Components of the
lattice piece 100 can be folded for the transport and can be rotated by 90° about the longitudinal axis. - Height of the
lattice piece 100 in the working configuration smaller than a permitted transport width (height in operation=width in transport due to 90° rotation)-
Lattice piece 100- 1) can be transported dismantled into individual parts or
- 2) all the parts can be folded up and transported as a single transport unit.
- The gibbing in the transport state may take place at the stack consoles 36 using “container corners” (twistlock consoles) and twistlocks=>inexpensive connection of the lateral
corner bar parts 30 and thecenter latticing 40. - The
consoles 36 can be used for stacking a plurality oflattice pieces 100.
-
-
-
FIGS. 1a-6d show example configurations with relative positioning of the various components. If shown directly contacting each other, or directly coupled, then such elements may be referred to as directly contacting or directly coupled, respectively, at least in one example. Similarly, elements shown contiguous or adjacent to one another may be contiguous or adjacent to each other, respectively, at least in one example. As an example, components laying in face-sharing contact with each other may be referred to as in face-sharing contact. As another example, elements positioned apart from each other with only a space there-between and no other components may be referred to as such, in at least one example. As yet another example, elements shown above/below one another, at opposite sides to one another, or to the left/right of one another may be referred to as such, relative to one another. Further, as shown in the figures, a topmost element or point of element may be referred to as a “top” of the component and a bottommost element or point of the element may be referred to as a “bottom” of the component, in at least one example. As used herein, top/bottom, upper/lower, above/below, may be relative to a vertical axis of the figures and used to describe positioning of elements of the figures relative to one another. As such, elements shown above other elements are positioned vertically above the other elements, in one example. As yet another example, shapes of the elements depicted within the figures may be referred to as having those shapes (e.g., such as being circular, straight, planar, curved, rounded, chamfered, angled, or the like). Further, elements shown intersecting one another may be referred to as intersecting elements or intersecting one another, in at least one example. Further still, an element shown within another element or shown outside of another element may be referred as such, in one example. - It will be appreciated that the configurations and routines disclosed herein are exemplary in nature, and that these specific embodiments are not to be considered in a limiting sense, because numerous variations are possible. Moreover, unless explicitly stated to the contrary, the terms “first,” “second,” “third,” and the like are not intended to denote any order, position, quantity, or importance, but rather are used merely as labels to distinguish one element from another. The subject matter of the present disclosure includes all novel and non-obvious combinations and sub-combinations of the various systems and configurations, and other features, functions, and/or properties disclosed herein.
- As used herein, the term “approximately” is construed to mean plus or minus five percent of the range unless otherwise specified.
- The following claims particularly point out certain combinations and sub-combinations regarded as novel and non-obvious. These claims may refer to “an” element or “a first” element or the equivalent thereof. Such claims should be understood to include incorporation of one or more such elements, neither requiring nor excluding two or more such elements. Other combinations and sub-combinations of the disclosed features, functions, elements, and/or properties may be claimed through amendment of the present claims or through presentation of new claims in this or a related application. Such claims, whether broader, narrower, equal, or different in scope to the original claims, also are regarded as included within the subject matter of the present disclosure.
Claims (20)
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DE102020118256.2A DE102020118256A1 (en) | 2020-07-10 | 2020-07-10 | Dismountable lattice piece for crane boom |
DE102020118256.2 | 2020-07-10 |
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US20220009752A1 true US20220009752A1 (en) | 2022-01-13 |
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US17/370,964 Pending US20220009752A1 (en) | 2020-07-10 | 2021-07-08 | Dismantlable lattice piece for crane boom |
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US (1) | US20220009752A1 (en) |
JP (1) | JP2022016337A (en) |
CN (1) | CN113911938A (en) |
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CN114772478B (en) * | 2022-03-15 | 2023-06-20 | 浙江三一装备有限公司 | Truss arm joint, truss arm and working machine |
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US20150314995A1 (en) * | 2012-11-19 | 2015-11-05 | Terex Cranes Germany Gmbh | Crane and lattice mast section for a lattice mast of a crane of this type |
US20160016765A1 (en) * | 2014-06-16 | 2016-01-21 | Liebherr-Werk Ehingen Gmbh | Lattice piece for a lattice boom, lattice boom and crane |
US20160023868A1 (en) * | 2013-03-22 | 2016-01-28 | Terex Cranes Germany Gmbh | Lattice Mast Element, Lattice Boom Comprising at Least One Lattice Mast Element of this Type and Crane Comprising at Least One Lattice Boom of this Type |
US20160264384A1 (en) * | 2013-11-08 | 2016-09-15 | Itrec B.V. | Crane boom segment for assembly of a crane boom, method for assembling a crane boom |
US20170275143A1 (en) * | 2016-02-10 | 2017-09-28 | Liebherr-Werk Ehingen Gmbh | Lattice piece element and lattice piece for crane boom |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
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CN111377367B (en) | 2020-04-22 | 2022-03-01 | 浙江三一装备有限公司 | Truss arm and crane |
-
2020
- 2020-07-10 DE DE102020118256.2A patent/DE102020118256A1/en active Pending
-
2021
- 2021-07-05 JP JP2021111248A patent/JP2022016337A/en active Pending
- 2021-07-08 US US17/370,964 patent/US20220009752A1/en active Pending
- 2021-07-09 CN CN202110777820.1A patent/CN113911938A/en active Pending
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US2975910A (en) * | 1958-06-06 | 1961-03-21 | Clark Equipment Co | Crane boom |
US20110284490A1 (en) * | 2010-05-21 | 2011-11-24 | Shanghai Sany Technology Co., Ltd. | Crane boom with multi main-chord |
US20150314995A1 (en) * | 2012-11-19 | 2015-11-05 | Terex Cranes Germany Gmbh | Crane and lattice mast section for a lattice mast of a crane of this type |
US20160023868A1 (en) * | 2013-03-22 | 2016-01-28 | Terex Cranes Germany Gmbh | Lattice Mast Element, Lattice Boom Comprising at Least One Lattice Mast Element of this Type and Crane Comprising at Least One Lattice Boom of this Type |
US20160264384A1 (en) * | 2013-11-08 | 2016-09-15 | Itrec B.V. | Crane boom segment for assembly of a crane boom, method for assembling a crane boom |
US10287142B2 (en) * | 2013-11-08 | 2019-05-14 | Itrec B.V. | Crane boom segment for assembly of a crane boom, method for assembling a crane boom |
US20160016765A1 (en) * | 2014-06-16 | 2016-01-21 | Liebherr-Werk Ehingen Gmbh | Lattice piece for a lattice boom, lattice boom and crane |
US9738495B2 (en) * | 2014-06-16 | 2017-08-22 | Liebherr-Werk Ehingen Gmbh | Lattice piece for a lattice boom, lattice boom and crane |
US20170275143A1 (en) * | 2016-02-10 | 2017-09-28 | Liebherr-Werk Ehingen Gmbh | Lattice piece element and lattice piece for crane boom |
US10287141B2 (en) * | 2016-02-10 | 2019-05-14 | Liebherr-Werk Ehingen Gmbh | Lattice piece element and lattice piece for crane boom |
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JP2022016337A (en) | 2022-01-21 |
CN113911938A (en) | 2022-01-11 |
DE102020118256A1 (en) | 2022-01-13 |
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