Jib crane mechanism

Abstract

Techniques are provided that facilitate increased operational reliability for jib cranes. In one example, a jib crane may include a mast, a shaft mechanism, and a rod. The mast may extend vertically from a base structure. The shaft mechanism may be disposed within the mast. The rod may be coupled to a boom arm and disposed within the shaft mechanism. Rotation of the rod may facilitate sustained rotation of the boom arm about a longitudinal axis of the rod relative to the base structure.

Description

Technical Field

[0001] The present disclosure relates to a mechanical mechanism for transferring a load, and more particularly to a jib crane, and to a technique for promoting enhanced operational reliability.

[0002] A jib crane is a multi-purpose lifting device capable of facilitating the transfer of a load around an arc surrounding its own base structure. Some jib cranes use bearings that minimize friction between moving parts to facilitate rotation of the jib crane while transferring a load. As a mechanical component, the bearing is subject to an increased failure rate over time or wear failure due to component degradation resulting from aging or use. As long as the jib crane transfers a load by rotation, bearing failure can have an adverse effect on the operational reliability of the jib crane and increase equipment downtime.

Summary of the Invention

[0003] The following presents an overview for providing a basic understanding of one or more embodiments of the present invention. This overview is not intended to identify particular embodiments, or to identify the main or important elements of the claims, or to define any scope thereof. Its sole purpose is to present concepts in a simplified form as a prelude to the more detailed description that is presented later. In one or more embodiments described herein, a system, device, and / or method for promoting enhanced operational reliability for a jib crane are described.

[0004] According to one embodiment, a jib crane may comprise a mast, a shaft mechanism, and a rod having a longitudinal axis. The mast may extend vertically from a base structure. The shaft mechanism may be located within the mast. The rod may be connected to a boom arm and located within the shaft mechanism. The rotation of the rod may facilitate the sustained rotation of the boom arm around the longitudinal axis relative to the base structure. One aspect of such a jib crane is that it may facilitate increased operational reliability.

[0005] In one embodiment, the jib crane may further include an adjustment mechanism interposed between the boom arm and the rod to facilitate angular adjustment of the boom arm relative to the mast. One aspect of such a jib crane is that it can provide additional flexibility in aligning the correspondence between the load and the boom arm to facilitate the transfer of the load.

[0006] In other embodiments, the apparatus may include a boom arm connected to a rod located in a shaft mechanism situated within a mast extending vertically from a base structure. The rotation of the rod facilitates the sustained rotation of the boom arm about the longitudinal axis of the rod relative to the base structure. One aspect of such an apparatus is that it can facilitate increased operational reliability.

[0007] In one embodiment, the boom arm may have a proximal end connected to the rod. In one embodiment, the device may further include a mounting bracket connected to the distal end of the boom arm opposite to the proximal end and an adjustment mechanism interposed between the boom arm and the mounting bracket. The adjustment mechanism may facilitate angular adjustment of the mounting bracket in a cross-section perpendicular to the centerline of the boom arm. One aspect of such a device is that it may provide additional flexibility in aligning the correspondence between the load and the boom arm to facilitate the transport of the load.

[0008] In other embodiments, the apparatus may include a shaft mechanism and a rod. The shaft mechanism may be located within a mast extending vertically from a base structure. The shaft mechanism may support a boom arm. The rod may be located within the shaft mechanism. The rotation of the rod may facilitate the sustained rotation of the boom arm around the longitudinal axis of the rod relative to the base structure. One aspect of such an apparatus is that it may facilitate increased operational reliability.

[0009] In one embodiment, the shaft mechanism may be adjustable along the longitudinal axis to facilitate adjustment of the distance between the proximal end of the boom arm connected to the shaft mechanism and the base structure. One aspect of such a device is that it can provide additional flexibility in aligning the correspondence between the load and the boom arm to facilitate the transfer of the load.

[0010] In other embodiments, the apparatus may comprise a rod having a longitudinal axis, a boom arm, and a mounting bracket. The rod may be located within a mast extending from a base structure. The boom arm may be connected to the rod via its proximal end. The boom arm may be capable of continuous rotation around the longitudinal axis relative to the base structure. The mounting bracket may facilitate the attachment of a load to the distal end of the boom arm opposite to the proximal end of the boom arm connected to the rod. One aspect of such an apparatus is that it may facilitate increased operational reliability.

[0011] In one embodiment, the device may further comprise one or more adjustment mechanisms that facilitate the adjustment of: the angular direction of the boom arm relative to the mast; the angular direction of the mounting bracket in a cross-section perpendicular to the centerline of the boom arm; the distance between the mounting bracket and the mast; the angular direction of the mounting bracket relative to the boom arm; or a combination thereof. One aspect of such a device is that it can provide additional flexibility in aligning the correspondence between the load and the boom arm to facilitate the transfer of the load.

[0012] In other embodiments, a computer-aided method may include the step of connecting a load to the distal end of a boom arm, which includes a proximal end connected to a rod located in a shaft mechanism situated in a mast extending vertically from a base structure, using a system operably coupled to a processor. The boom arm may be continuously rotatable around the longitudinal axis of the rod relative to the base structure. The computer-aided method may further include the step of transferring the load from a first position to a second position by rotating the boom arm around the longitudinal axis using the system. One aspect of such computer-aided methods is that they can facilitate increased operational reliability.

[0013] In one embodiment, the computer mounting method may further include a step of adjusting by the system the angular direction of the boom arm relative to the mast, the angular direction of the mounting bracket in a cross-section perpendicular to the centerline of the boom arm, the distance between the mounting bracket and the mast, or the angular direction of the mounting bracket relative to the boom arm, wherein the mounting bracket is connected to the distal end of the boom arm. One aspect of such a computer mounting method is that it can provide additional flexibility in aligning the correspondence between the load and the boom arm to facilitate the transport of the load. [Brief explanation of the drawing]

[0014] [Figure 1] The following are perspective views of exemplary, non-limiting operating environments for implementing one or more embodiments described herein.

[0015] [Figure 2] Other perspective views of the exemplary, non-limiting operating environment of Figure 1 according to one or more embodiments described herein are shown.

[0016] [Figure 3] Figure 1 shows a side view of an exemplary non-limiting operating environment according to one or more embodiments described herein.

[0017] [Figure 4] The following are cross-sectional views of exemplary non-limiting mast structures according to one or more embodiments described herein.

[0018] [Figure 5] The following are perspective views of exemplary non-limiting arm structures according to one or more embodiments described herein.

[0019] [Figure 6] Figure 5 shows an exploded perspective view of an exemplary non-limiting arm structure according to one or more embodiments described herein.

[0020] [Figure 7] This specification describes an exemplary non-limiting adjustment mechanism for adjusting the angular direction of the boom arm relative to the mast, according to one or more embodiments described herein.

[0021] [Figure 8] This specification describes an exemplary non-limiting adjustment mechanism for adjusting the angular direction of a mounting bracket relative to a boom arm, according to one or more embodiments described herein.

[0022] [Figure 9]An exemplary non-limiting adjustment mechanism for adjusting the angular orientation of a mounting bracket within a cross-section orthogonal to the centerline of a boom arm, according to one or more embodiments described herein, is shown.

[0023] [Figure 10] An exemplary non-limiting shaft mechanism for adjusting the distance between a base structure and the proximal end of a boom arm, according to one or more embodiments described herein, is shown.

[0024] [Figure 11] An exemplary non-limiting adjustment mechanism for adjusting the distance between a mast and a mounting bracket, according to one or more embodiments described herein, is shown.

[0025] [Figure 12] An exemplary non-limiting high-level overview of the transfer of a load by rotation of a boom arm, according to one or more embodiments described herein, is shown.

[0026] [Figure 13] A flow diagram of an exemplary non-limiting computer-implemented method for facilitating the operation of a jib crane for transferring a load, according to one or more embodiments described herein, is shown.

[0027] [Figure 14] A block diagram of an exemplary non-limiting operating environment in which one or more embodiments described herein may be facilitated is shown.

BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The following detailed description is merely exemplary and is not intended to limit embodiments and / or the application or use of embodiments. Further, there is no intention to be bound by any express or implied information presented in the foregoing Background or Summary sections, or in the Detailed Description section.

[0029] Here, one or more embodiments are described with reference to the drawings, and throughout, similar reference numerals are used to refer to similar elements. In the following description, many specific details are included for illustrative purposes to provide a more complete understanding of one or more embodiments. However, it is evident that in various cases one or more embodiments can be carried out without these specific details.

[0030] The embodiments described herein address the shortcomings discussed previously and promote increased operational reliability for jib cranes. For example, as discussed previously, some jib cranes use bearings that facilitate the rotation of the jib crane while transferring loads by minimizing friction between moving parts. However, as mechanical components, bearings suffer from increased failure rates over time or wear failures due to component degradation caused by aging or use. As long as the jib crane transfers loads by rotation, bearing failures can negatively impact the operational reliability of the jib crane and increase downtime. In contrast, the embodiments described herein can promote increased operational reliability of the jib crane by implementing a bearing-less mast structure.

[0031] Figures 1 to 3 show an exemplary non-limiting operating environment 100 for implementing one or more embodiments described herein. As shown, the operating environment 100 includes jib cranes 101 and 102 connected to loads 103 and 104, respectively. Although Figures 1 to 3 show loads 103 and 104 as partitioned side walls of cylindrical chambers (e.g., the external vacuum chamber of a cryostat), those skilled in the art will understand that jib cranes 101 and / or 102 can be connected to other types of conveying loads. Generally, jib cranes 101 and 102 each comprise a base structure 110 connected to a mast structure 120 that mechanically supports an arm structure 150. The base structure 110 can be fixed to a surface 200 via a plurality of mounting mechanisms 112. In one embodiment, the load capacity of the jib crane determines the number of mounting mechanisms that make up the plurality of mounting mechanisms 112, the length of at least one mounting mechanism that makes up the plurality of mounting mechanisms 112, or a combination thereof.

[0032] The surface 200 may be a substantially fixed foundation structure (e.g., a concrete slab and a metallic platform) that mechanically supports the loads 103 and 104, as shown in Figures 2 and 3. In one embodiment, the surface 200 may be a movable platform that facilitates the repositioning of the jib cranes 101 and / or 102 from one position to another for connection to various loads. For example, the surface 200 may include carts, movable platforms, and vehicles. In one embodiment, one or more gusset plates 122 can be attached (e.g., welded) to the jib cranes 101 and / or 102 in proximity to the intersection between the base structure 110 and the mast structure 120. One or more gusset plates 122 can provide additional mechanical support to the mast structure 120. One or more gusset plates 122 can further enhance the attachment mechanism (e.g., welding) that connects the base structure 110 to the mast structure 120.

[0033] As shown in Figure 2, the mast structure 120 can also be connected to a base structure 125 fixed to a frame 250 that supports loads 103 and 104. In one embodiment, the jib cranes 101 and / or 102 can be mounted without the base structure 110 or base structure 125. For example, the jib crane 101 can be mounted using a mast structure 120 that extends vertically from the base structure 125. In this example, the jib crane 101 is separable from the surface 200 that supports the frame 250. In another example, the jib crane 102 can be mounted without the base structure 125 so that the jib crane 102 is separable from the frame 250.

[0034] Referring to Figure 4, the mast structure 120 comprises a mast 130, a shaft mechanism 140 located within the mast 130, and a rod 410 located within the shaft mechanism 140. The inner wall 442 of the shaft mechanism 140 defines a channel having a diameter 445, which can be dimensioned based on the outer diameter 415 of the rod 410. One aspect of dimensioning the diameter 445 may include setting a minimum value for the diameter 445 so that the channel defined by the inner wall 442 of the shaft mechanism 140 can accommodate the rod 410. Another aspect of dimensioning the diameter 445 may include setting a maximum value for the diameter 445 to facilitate sufficient contact between the outer wall 412 of the rod 410 and the inner wall 442 of the shaft mechanism 140, thereby enabling at least a portion of the torque applied to the rod 410 to be transmitted to the shaft mechanism 140. In one embodiment, the maximum value of the diameter 445 may be set to minimize the annular portion 420 between the rod 410 and the shaft mechanism 140. In one embodiment, the shaft mechanism 140 may include a stainless steel cylinder. In one embodiment, the rod 410 may be solid. In one embodiment, the rod 410 may be hollow with a channel substantially surrounding the longitudinal axis 417 of the rod 410.

[0035] The inner wall 432 of the mast 130 defines a channel having a diameter 435, which can be dimensionally determined based on the outer diameter 447 of the shaft mechanism 140. One aspect of determining the diameter 435 may include setting a minimum value for the diameter 435 so that the channel defined by the inner wall 432 of the mast 130 can accommodate the shaft mechanism 140. Another aspect of determining the diameter 435 may include setting a value for the diameter 435 such that an annular portion 430 is provided between the mast 130 and the shaft mechanism 140, which facilitates minimizing contact between the outer wall 444 of the shaft mechanism 140 and the inner wall 432 of the mast 130. Minimizing such contact makes it possible to facilitate the rotation of the shaft mechanism 140 within the mast 130 when torque is applied to the rod 410.

[0036] In one embodiment, a bushing may be interposed between the shaft mechanism 140 and the mast 130. In one embodiment, a bushing may be interposed between the shaft mechanism 140 and the mast 130 within the annular portion 430. In one embodiment, a bushing may be interposed between the shaft mechanism 140 and the mast 130 in close proximity to the boom arm 170, in close proximity to the base structure 110, or in a combination thereof. In one embodiment, the bushing may contact the inner wall 432 of the mast 130 and the outer wall of the shaft mechanism 140. In one embodiment, as shown in Figures 2 to 3, a protective sleeve 240 can be placed over the shaft mechanism 140 to reduce the intrusion of foreign matter into the annular portion 430.

[0037] Referring to Figures 1 to 3, the arm structure 150 generally comprises a boom arm 170 and a mounting bracket 190. The proximal end 172 of the boom arm 170 is connected to a rod 410 located within the mast structure 120 via an adjustment mechanism 160. By connecting the rod 410 to the proximal end 172 of the boom arm 170, the rotation of the rod 410 facilitates the sustained rotation of the boom arm 170 around the longitudinal axis 417 relative to the base structure 110. The distal end 174 of the boom arm 170 is connected to the mounting bracket 190 via adjustment mechanisms 180 and 280, which is best seen in Figure 2.

[0038] The mounting bracket 190 can facilitate the attachment of loads (e.g., loads 103 and / or 104) to the distal end 174 of the boom arm 170. To this end, the mounting bracket 190 may be provided with one or more pick points to facilitate the attachment of loads to the distal end 174 of the boom arm 170. In an exemplary operating environment 100, these one or more pick points include pick points 192 and 194, which is best seen in Figure 2. The load 103 is provided with brackets 212 and 214. Pick point 192 is capable of receiving a retaining mechanism 222 through bracket 212, and pick point 194 is capable of receiving a retaining mechanism through bracket 214. In Figures 1 to 6, pick points 192 and 194 are shown to be positioned close to each other at opposite ends of the mounting bracket 190. However, in other embodiments, one or more pick points of the mounting bracket 190 can be arranged differently. For example, the mounting bracket 190 may have a pick point positioned close to the midpoint of the mounting bracket 190.

[0039] In various embodiments described herein, the arm structure 150 may further include one or more adjustment mechanisms that provide additional flexibility in aligning the correspondence between the load and the boom arm 170 to facilitate the transfer of the load. Referring to Figures 5 to 6, the arm structure 150 may include an adjustment mechanism 160 interposed between the rod 410 and the proximal end 172 of the boom arm 170. The adjustment mechanism 160 can facilitate a removable coupling of the boom arm 170 and the rod 410 by the operation of a retaining mechanism 561. The adjustment mechanism 160 can further facilitate the angular adjustment 501 of the boom arm 170 relative to the mast 130 by the operation of a pin 563. For example, the angular adjustment 501 of the boom arm 170 relative to the mast 130 is adjustable by moving the pin 563 from an upper clearance hole of the adjustment mechanism 160, where the pin 563 is depicted in Figure 5, to a lower clearance hole 565 of the adjustment mechanism 160.

[0040] The arm structure 150 may further include an adjustment mechanism 280 interposed between the mounting bracket 190 and the distal end 174 of the boom arm 170. The adjustment mechanism 280 facilitates the adjustment of the distance between the mounting bracket 190 and the mast 130 by the operation of the mounting mechanism 581 and the slot 582. For example, when the mounting mechanism 581 is tightened, it is possible to restrict the movement of the mounting mechanism 581 within the slot 582, whereas when the mounting mechanism 581 is not tightened, such movement of the mounting mechanism 581 is possible. Thus, the mounting mechanism 581 can be shifted to an untightened state, and the distance between the mounting bracket 190 and the mast 130 can be adjusted in an inward direction 503 or an outward direction 505. Once the desired distance between the mounting bracket 190 and the mast 130 is obtained, the mounting mechanism can be shifted from an untightened state to a tightened state.

[0041] The adjustment mechanism 280 can further facilitate angular adjustment of the mounting bracket 190 in a cross-section perpendicular to the centerline 571 of the boom arm 170 through the operation of the mounting mechanism 681, mounting mechanism 683, and slot 686. For example, under the interaction between the mounting mechanism 683 and slot 686, when the mounting mechanism 683 is not tightened, the mounting bracket 190 can rotate freely around the mounting mechanism 681. In this example, under the interaction between the mounting mechanism 683 and slot 686, the mounting bracket 190 can rotate around the mounting mechanism 681 in direction 511 or direction 509. By transitioning the mounting mechanism 683 from an untightened state to a tightened state, the rotation of the mounting bracket 190 around the mounting mechanism 681 can be restricted. In one embodiment, the adjustment mechanism 280 can further facilitate the removable coupling of the mounting bracket 190 to the boom arm 170. For example, the mounting bracket 190 can be removed from the boom arm 170 by removing the mounting mechanism 581.

[0042] The arm structure 150 may further include an adjustment mechanism 180 interposed between the mounting bracket 190 and the distal end 174 of the boom arm 170. The adjustment mechanism 280 can facilitate angular adjustment 507 of the mounting bracket 190 relative to the boom arm 170 through the operation of the retaining mechanism 583, the open slot 584, the retaining mechanism 585, and the mounting mechanism 587. For example, under the interaction between the plate of the mounting mechanism 280 and the mounting bracket 190, when the retaining mechanism 585 is removed and the mounting mechanism 587 is not tightened, the mounting bracket 190 can rotate freely around the retaining mechanism 583. The rotation of the mounting bracket 190 around the retaining mechanism 583 can be restricted by inserting the retaining mechanism 585 into the adjustment mechanism 180, or by shifting the mounting mechanism 587 from an untightened state to a tightened state. While the mounting bracket 190 rotates freely around the retaining mechanism 583, the retaining mechanism 585 can be inserted into the adjustment mechanism 180, thereby locking the mounting bracket 190 in the corresponding angular direction 507 through the clearance hole 590 of the mounting bracket 190. In one embodiment, the adjustment mechanism 180 can further facilitate the removable coupling of the mounting bracket 190 to the boom arm 170. For example, the mounting bracket 190 can be removed from the boom arm 170 by removing the retaining mechanism 583 and shifting the mounting mechanism 587 to an unclamped state.

[0043] Referring to Figure 7, the adjustment mechanism 720, interposed between the boom arm and the mast 710, can facilitate the angular adjustment of the boom arm relative to the mast 710. For example, the boom arm can be moved from a first position 730 to a second position 731 by the operation of the adjustment mechanism 720. By moving the boom arm from the first position 730 to the second position 731, the adjustment mechanism 720 can adjust the angular direction of the boom arm relative to the mast 710 from a first angular direction 765 to a second angular direction 775. In one embodiment, the adjustment mechanism 720 can be implemented using an adjustment mechanism 160. In one embodiment, the adjustment mechanism 720 may be interposed between the boom arm and a rod (e.g., rod 410) located within the mast 710.

[0044] Referring to Figure 8, the adjustment mechanism 840 interposed between the boom arm 830 and the mounting bracket facilitates the angular adjustment of the mounting bracket relative to the boom arm 830. For example, the mounting bracket can be moved from a first position 850 to a second position 851 by the operation of the adjustment mechanism 840. By moving the mounting bracket from the first position 850 to the second position 851, the adjustment mechanism 840 can adjust the angular direction of the mounting bracket relative to the boom arm 830 from a first angular direction 865 to a second angular direction 875. In one embodiment, the adjustment mechanism 840 can be implemented using an adjustment mechanism 180.

[0045] Referring to Figures 8 and 9, the adjustment mechanism 940 can facilitate angular adjustment of the mounting bracket within a cross-section 901 perpendicular to the centerline 903 of the boom arm (e.g., boom arm 830). For example, the mounting bracket can be moved from a first position 950 to a second position 951 by the operation of the adjustment mechanism 940. By moving the mounting bracket from the first position 950 to the second position 951, the adjustment mechanism 940 can adjust the angular direction of the mounting bracket within the cross-section 901 from an angular direction where the mounting bracket is substantially parallel to the centerline 905 of the mast 910 supporting the boom arm to a first angular direction 965. As another example, the mounting bracket can be moved from a first position 950 to a third position 952 by the operation of the adjustment mechanism 940. By moving the mounting bracket from a first position 950 to a third position 952, the adjustment mechanism 940 can adjust the angular direction of the mounting bracket within the cross section 901 from an angular direction in which the mounting bracket is substantially parallel to the centerline 905 of the mast 910 to a second angular direction 975. In one embodiment, the adjustment mechanism 940 can be implemented using an adjustment mechanism 280.

[0046] Referring to Figure 10, a shaft mechanism 1060 located within the mast 1010 can facilitate adjustment of the distance between the base structure 1001 and the boom arm. For example, the boom arm can be moved from a first position 1030 to a second position 1031 by adjusting the shaft mechanism 1060 along the longitudinal axis 1062. By moving the boom arm from the first position 1030 to the second position 1031, the shaft mechanism 1060 can adjust the distance between the base structure 1001 and the boom arm from a first distance 1065 to a second distance 1075. In one embodiment, the mast 1010 and the shaft mechanism 1060 may be implemented by a mast 140 and a shaft mechanism 130, respectively. In one embodiment, the mast 1010 may have a threaded inner wall that receives threads located on the outer wall of the shaft mechanism 1060. In one embodiment, the shaft mechanism 1060 may have a threaded outer wall that receives threads located on the inner wall of the mast 1010. In one embodiment, the distance between the base structure 1001 and the boom arm can be increased by rotating the shaft mechanism 1060 in a first direction around the vertical axis 1062, and the distance between the base structure 1001 and the boom arm can be decreased by rotating the shaft mechanism 1060 in a second direction opposite to the first direction around the vertical axis 1062.

[0047] Referring to Figure 11, an adjustment mechanism (e.g., adjustment mechanisms 1120 and / or 1140) interposed between the mast 1110 and the mounting bracket can facilitate adjustment of the distance between the mounting bracket and the mast 1110. For example, the mounting bracket can be moved from a first position 1150 to a second position 1151 by the operation of the adjustment mechanism. By moving the mounting bracket from the first position 1150 to the second position 1151, the adjustment mechanism can adjust the distance between the mounting bracket and the mast 1110 from a first distance 1165 to a second distance 1175. In one embodiment, the adjustment mechanism can be implemented using an adjustment mechanism 280.

[0048] Figure 12 provides an exemplary, non-limiting, highly conceptual overview of load transfer by boom arm rotation according to one or more embodiments described herein. For example, the loads in Figure 12 may be implemented as partitioned side walls (i.e., loads 103 and 104) of a cylindrical chamber shown in Figures 1 to 3. In this example, the boom arm of jib crane 101 may be connected to load 103 at position 1210, and the boom arm of jib crane 102 may be connected to load 104 at position 1220. Load 103 can be transferred from position 1210 to position 1215 by rotating the boom arm of jib crane 101 around its own longitudinal axis. Similarly, load 104 can be transferred from position 1220 to position 1225 by rotating the boom arm of jib crane 102 around its own longitudinal axis.

[0049] Figure 13 shows a flowchart of an exemplary non-limiting computer implementation method 1300 that facilitates enhanced operational reliability for a jib crane according to one or more embodiments described herein. Repeated descriptions of similar elements used in other embodiments described herein are omitted for brevity. In 1310, the computer implementation method 1300 may include a step of connecting a load to the distal end of a boom arm (e.g., boom arm 170), which includes a proximal end connected to a shaft mechanism (e.g., shaft mechanism 140) located in a mast (e.g., mast 130) extending vertically from a base structure (e.g., base structure 110), by a system operably coupled to a processor. The boom arm may be continuously rotatable around the longitudinal axis of the shaft mechanism relative to the base structure. In 1320, the computer implementation method 1300 may further include a step of the system transferring the load from a first position to a second position by rotating the boom arm around the longitudinal axis. In one embodiment, the system can rotate the boom arm around a longitudinal axis by operating a controller associated with a drive mechanism connected to a rod (e.g., rod 410) located within a shaft mechanism. In one embodiment, the drive mechanism may comprise a motor or an engine. In one embodiment, the computer implementation method 1300 may further include a step of adjusting by the system the angular direction of the boom arm relative to the mast, the angular direction of the mounting bracket in a cross-section perpendicular to the centerline of the boom arm, the distance between the mounting bracket and the mast, or the angular direction of the mounting bracket relative to the boom arm, where the mounting bracket is connected to the distal end of the boom arm. In one embodiment, the mounting bracket may be connected to the distal end of the boom arm.

[0050] To provide context for various aspects of the disclosed subject matter, Figure 14 and the subsequent description are intended to provide a general description of suitable environments in which various aspects of the disclosed subject matter may be implemented. Figure 14 shows that a suitable operating environment 1400 for implementing various aspects of the disclosure may also include a computer 1412. The computer 1412 may also include a processing unit 1414, system memory 1416, and a system bus 1418, the system bus 1418, but not limited to the system memory 1416, which connects system components to the processing unit 1414. The processing unit 1414 may be any of the various available processors. Dual microprocessors and other multiprocessor architectures may also be used as the processing unit 1414. The system bus 1418 may be any of several types of bus structures, including a memory bus or memory controller, peripheral bus or external bus, and / or local bus, using any various bus architectures available, such as Industry Standard Architecture (ISA), Microchannel Architecture (MSA), Extended ISA (EISA), Intelligent Drive Electronics (IDE), VESA Local Bus (VLB), Peripheral Component Interconnect (PCI), CardBus, Universal Serial Bus (USB), Advanced Graphics Port (AGP), Firewire® (IEEE 1094), and Small Computer System Interface (SCSI). The system memory 1416 may also include volatile memory 1420 and non-volatile memory 1422. The Basic Input / Output System (BIOS), which includes basic routines for transferring information between elements within the computer 1412 during startup, etc., is stored in the non-volatile memory 1422.As an example, not an limitation, non-volatile memory 1422 may include read-only memory (ROM), programmable memory (PROM), electroprogrammable memory (EPROM), electroerasable programmable memory (EEPROM), flash memory, or non-volatile random-access memory (RAM) (e.g., ferroelectric RAM (FeRAM)). Volatile memory 1420 may also include random-access memory (RAM) that operates as external cache memory. As an example, not an limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data-rate SDRAM (DDR SDRAM), extended SDRAM (ESDRAM), Synchlink DRAM (SLDRAM), direct Rambus RAM (DRRAM), direct Rambus dynamic RAM (DRDRAM), and Rambus dynamic RAM.

[0051] Computer 1412 may also include removable / non-removable, volatile / non-volatile computer storage media. Figure 14 shows, for example, disk storage 1424. Disk storage 1424 may also include, but is not limited to, devices such as magnetic disk drives, floppy disk drives, tape drives, Jaz drives, Zip drives, LS-100 drives, flash memory cards, or memory sticks. Disk storage 1424 may also include storage media separately or in combination with other storage media, which may include, but is not limited to, optical disk drives such as compact disk ROM devices (CD-ROMs), CD recordable drives (CD-R drives), CD rewritable drives (CD-RW drives), or digital versatile disk ROM drives (DVD-ROMs). To facilitate the connection of disk storage 1424 to the system bus 1418, removable or non-removable interfaces such as interface 1426 are typically used. Figure 14 also shows software that acts as an intermediary between basic computer resources and users, as described within a suitable operating environment 1400. Such software may also include, for example, an operating system 1428. The operating system 1428, which may be stored in disk storage 1424, operates to control and allocate the resources of computer 1412. System applications 1430 leverage the resource management by the operating system 1428, for example, through program modules 1432 and program data 1434, which are stored in either system memory 1416 or disk storage 1424. It should be understood that this disclosure may be implemented with various operating systems or combinations of operating systems. The user enters commands or information into computer 1412 through input device 1436.Input devices 1436 include, but are not limited to, pointing devices such as mice, trackballs, styluses, touchpads, keyboards, microphones, joysticks, gamepads, satellite dishes, scanners, TV tuner cards, digital cameras, digital video cameras, and webcams. These and other input devices are connected to the processing unit 1414 via the system bus 1418 through the interface port 1438. The interface port 1438 includes, for example, serial ports, parallel ports, game ports, and Universal Serial Bus (USB). Output devices 1440 use some of the same type of ports as input devices 1436. For example, a USB port may be used to provide input to the computer 1412 and to output information from the computer 1412 to the output device 1440. Output adapters 1442 are provided to indicate that there are several other output devices 1440 that require special adapters, such as monitors, speakers, and printers. The output adapter 1442 includes, but is not limited to, a video and sound card that provides means of connection between the output device 1440 and the system bus 1418. It can be noted that other devices and / or systems of devices provide both input and output capabilities, such as a remote computer 1444.

[0052] Computer 1412 may operate in a network environment using logical connections to one or more remote computers, such as remote computer 1444. Remote computer 1444 could be a computer, server, router, network PC, workstation, microprocessor-based device, peer device, or other common network node, and typically may include many or all of the elements described with respect to computer 1412. For the sake of brevity, only the memory storage device 1446 is shown in conjunction with remote computer 1444. Remote computer 1444 is logically connected to computer 1412 via network interface 1148, and then physically connected via communication connection 1450. Network interface 1448 encompasses wired and / or wireless communication networks, such as local area networks (LANs), wide area networks (WANs), and cellular networks. LAN technologies include fiber distributed data interfaces (FDDI), copper distributed data interfaces (CDDI), Ethernet®, and Token Ring, among others. WAN technologies include, but are not limited to, point-to-point links, circuit-switched networks such as Integrated Services Digital Network (ISDN®) and its variations, packet-switched networks, and digital subscriber lines (DSL). Communication connection 1450 refers to the hardware / software used to connect network interface 1448 to system bus 1418. For clarity of explanation, communication connection 1450 is shown inside computer 1412, but it may also be outside computer 1412. For illustrative purposes only, hardware / software for connecting to network interface 1448 may also include internal and external technologies such as modems including typical telephone-grade modems, cable modems, and DSL modems, ISDN® adapters, and Ethernet® cards.

[0053] The present invention may be a system, apparatus, computer implementation method, and / or computer program product integrated at any conceivable level of technical detail. The computer program product may include a computer-readable storage medium (or a plurality of computer-readable storage mediums) having computer-readable program instructions for causing a processor to perform aspects of the present invention. The computer-readable storage medium may be a tangible device capable of holding and storing instructions used by an instruction execution device. The computer-readable storage medium may be, but is not limited to, an electronic storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination of the above. A non-exclusive list of more specific examples of computer-readable storage media may also include portable computer diskettes, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), static random access memory (SRAM), portable compact disk read-only memory (CD-ROM), digital multipurpose disks (DVDs), memory sticks, floppy disks, mechanically encoded devices such as punched cards or raised structures in grooves on which instructions are recorded, and any suitable combination of those described above. In this specification, computer-readable storage media should not be construed in themselves as radio waves or other freely propagating electromagnetic waves, electromagnetic waves propagating through waveguides or other transmitting media (e.g., light pulses passing through optical fiber cables), or transient signals such as electrical signals transmitted over wires.

[0054] The computer-readable program instructions described herein may be downloaded from a computer-readable storage medium to each computing / processing device, or downloaded to an external computer or external storage device via a network, such as the Internet, a local area network, a wide area network, and / or a wireless network. The network may include copper transmission cables, optical transmission fibers, wireless transmissions, routers, firewalls, switches, gateway computers, and / or edge servers. A network adapter card or network interface within each computing / processing device receives computer-readable program instructions from the network and transfers those computer-readable program instructions for storage in a computer-readable storage medium within each computing / processing device. The computer-readable program instructions that perform the operations of the disclosure may be assembler instructions, instruction set architecture (ISA) instructions, machine instructions, machine-dependent instructions, microcode, firmware instructions, state setting data, integrated circuit configuration data, or source code or object code written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Smalltalk® or C++, and procedural programming languages ​​such as the C programming language or similar programming languages. Computer-readable program instructions, as a standalone software package, can run entirely on the user's computer, partially on the user's computer, partially on the user's computer and partially on a remote computer, or run entirely on a remote computer or server.In the latter scenario, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or the connection may be made to an external computer (for example, via the Internet using an Internet service provider). In some embodiments, to carry out aspects of the present invention, electronic circuits, for example, including a programmable logic circuit, a field-programmable gate array (FPGA), or a programmable logic array (PLA), may execute computer-readable program instructions by personalizing the electronic circuit using state information of computer-readable program instructions.

[0055] Aspects of the present invention are described herein with reference to flowcharts and / or block diagrams of methods, apparatuses (systems), and computer program products according to embodiments of the present invention. It will be understood that each block in a flowchart and / or block diagram, and combinations of blocks in a flowchart and / or block diagram, can be implemented by computer-readable program instructions. These computer-readable program instructions may be provided to a general-purpose computer processor, a dedicated computer, or other programmable data processing device for generating machines, thereby creating means for instructions executed via the computer processor or other programmable data processing device to implement functions / operations specified in one or more blocks in a flowchart and / or block diagram. These computer-readable program instructions may also be stored in a computer-readable storage medium capable of instructing computers, programmable data processing devices, and / or other devices to function in a particular manner, thereby providing a product in which the computer-readable storage medium storing the instructions has instructions that implement the modes of functions / operations specified in one or more blocks in a flowchart and / or block diagram. Furthermore, computer-readable program instructions can also be loaded into a computer, other programmable data processing device, or other device to create a computer implementation process by causing the computer, other programmable device, or other device to execute a series of actions, thereby causing the instructions executed on the computer, other programmable device, or other device to implement the functions / actions specified in one or more blocks of a flowchart and / or block diagram.

[0056] The flowcharts and block diagrams in the drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of the present invention. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of instructions containing one or more executable instructions for implementing a specified logical function. In some alternative implementations, the functions described in a block may occur in an order other than that shown in the diagram. For example, two blocks shown consecutively may actually be executed substantially simultaneously, or such blocks may, depending on the functionality involved, be executed in reverse order. It should also be noted that each block in a block diagram and / or flowchart, and combinations of blocks in a block diagram and / or flowchart, may be implemented by a dedicated hardware-based system that performs a specified function or operation, or performs a combination of dedicated hardware and computer instructions.

[0057] While the subject matter has been described above in the general context of computer executable instructions for computer program products running on one and / or more computers, those skilled in the art will recognize that the disclosure can be implemented in combination with other program modules. Generally, program modules include routines, programs, components, data structures, etc., that perform a specific task and / or implement a specific abstract data type. Furthermore, those skilled in the art will recognize that the computer implementation methods of the present invention can be implemented in other computer system configurations, including single-processor or multi-processor computer systems, minicomputing devices, mainframe computers, computers, handheld computing devices (e.g., PDAs®, telephones), microprocessor-based or programmable consumer or industrial electronic equipment. The embodiments shown can also be implemented in a distributed computing environment where tasks are performed by remote processing devices linked over a communication network. However, some, though not all, embodiments of the disclosure can be implemented on a standalone computer. In a distributed computing environment, program modules can reside in both local and remote memory storage devices. For example, in one or more embodiments, a computer executable component may include, or may consist of, one or more distributed memory units and be executed from memory. In this specification, the terms “memory” and “memory unit” are interchangeable. Furthermore, one or more embodiments described herein may execute code of a computer executable component in a distributed manner (e.g., multiple processors working together to execute code from one or more distributed memory units). In this specification, the term “memory” may encompass a single memory or memory unit in one location, or multiple memories or memory units in one or more locations.

[0058] In this application, terms such as “component,” “system,” “platform,” and “interface” refer to and / or include computer-related entities or entities relating to an operating machine having one or more specific functionalities. Entities disclosed herein may be hardware, a combination of hardware and software, software, or running software. For example, a component may be, but is not limited to, a process running on a processor, a processor, an object, an executable file, a thread of execution, a program, and / or a computer. For example, both an application running on a server and the server itself may be components. One or more components may reside within a process and / or a thread of execution, and components may be localized in one computer and / or distributed across two or more computers. In other examples, each component may be executed from various computer-readable media storing various data structures. Components may communicate via local and / or remote processes, for example, by following signals that have one or more data packets (e.g., data from one component interacting via signals with a local system, other components in a distributed system, and / or other components across a network such as the Internet involving other systems). Another example is a device that has inherent functionality provided by mechanical parts operated by electrical or electronic circuits, which are operated by software or firmware applications run by a processor. In such a case, the processor may be inside or outside the device and may execute at least a portion of the software or firmware application.As yet another example, a component may be a device that provides inherent functionality through electronic components without using mechanical parts, and such electronic components may include a processor or other means for running software or firmware that provides at least partially the functionality of the electronic components. In one embodiment, a component may emulate an electronic component via, for example, a virtual machine in a cloud computing system.

[0059] Furthermore, the word “or” is intended to mean an inclusive “or,” not an exclusive “or.” That is, unless otherwise specified or it is clear from the context, “X uses A or B” is intended to mean any of the inherent inclusive reorderings. That is, if X uses A, if X uses B, or if X uses both A and B, “X uses A or B” is satisfied in any of the aforementioned cases. Furthermore, the articles “a” and “an” used herein and in the accompanying drawings should generally be interpreted as meaning “one or plural,” unless otherwise specified or it is clear from the context that they refer to a singular form. In this specification, the words “example” and / or “exemplary” are used to mean an example, instance, or illustration. To avoid doubt, the subject matter disclosed herein is not limited by such examples. Furthermore, any embodiment or design described herein as “example” and / or “exemplary” is not necessarily construed as being preferable or advantageous to other embodiments or designs, nor is it intended to exclude equivalent exemplary structures and techniques known to those skilled in the art.

[0060] As used herein, the term “processor” can refer to substantially any computing unit or device having a single-core processor, a single processor with software multithreading capabilities, a multi-core processor, a multi-core processor with software multithreading capabilities, a multi-core processor with hardware multithreading technology, a parallel platform, and a parallel platform with distributed shared memory. Furthermore, a processor can refer to an integrated circuit, an application-specific integrated circuit (ASIC), a digital signal processor (DSP), a field-programmable gate array (FPGA), a programmable logic controller (PLC), a complex-programmable logic device (CPLD), discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. Furthermore, a processor may utilize nanoscale architectures such as molecular and quantum dot-based transistors, switches, and gates, but not limited to these, to optimize space utilization or enhance the performance of user equipment. A processor can also be implemented as a combination of computing units. In this disclosure, terms such as “memory,” “storage,” “data memory,” “data storage,” “database,” and substantially any other information storage component relating to the operation and functionality of a component are used to refer to “memory” or “memory component” entities embodied in a component containing memory. It should be understood that the memory and / or memory components described herein may be either volatile memory or non-volatile memory, or may include both volatile and non-volatile memory.For illustrative purposes only, non-volatile memory may include, but is not limited to, read-only memory (ROM), programmable memory (PROM), electrically programmable memory (EPROM), electrically erasable memory (EEPROM), flash memory, or non-volatile random-access memory (RAM) (e.g., ferroelectric RAM (FeRAM)). Volatile memory may include, for example, RAM that can function as external cache memory. For illustrative purposes only, RAM is available in many forms, such as synchronous RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data-rate SDRAM (DDR SDRAM), extended SDRAM (ESDRAM), Synchlink DRAM (SLDRAM), direct Rambus RAM (DRRAM), direct Rambus dynamic RAM (DRDRAM), and Rambus dynamic RAM (RDRAM). Furthermore, the memory components disclosed herein for systems or computer implementations are intended to include, but are not limited to, these types of memory and any other suitable types of memory.

[0061] The above descriptions include only examples of systems and computer implementations. Naturally, it is impossible to describe every conceivable combination of components or computer implementations for the purposes of illustrating this disclosure, but those skilled in the art will recognize that many further combinations and substitutions of the disclosure are possible. Furthermore, to the extent that “includes,” “has,” “possesse,” and similar terms are used in the detailed description, claims, appendices, and drawings, such terms are intended to be as comprehensive as the term “comprising,” as they are to be interpreted as “comprising” when used as transitional words in the claims.

[0062] The descriptions of various embodiments are presented for illustrative purposes only and are not intended to be exhaustive or limit the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein has been selected to best describe the principles of the embodiments, the practical application of the technology found in the market or technical improvements thereto, or to enable other persons skilled in the art to understand the embodiments disclosed herein.

Claims

1. The boom arm is connected to a rod located within a shaft mechanism positioned within a mast extending vertically from the base structure, wherein the rotation of the rod facilitates the sustained rotation of the boom arm around the vertical axis of the rod relative to the base structure. The shaft mechanism is adjustable along the longitudinal axis relative to the mast to facilitate adjustment of the distance between the proximal end of the boom arm connected to the shaft mechanism and the base structure. Device.

2. The apparatus according to claim 1, wherein a screw thread is provided on the inner wall of the mast to receive the screw thread arranged on the outer wall of the shaft mechanism.

3. The boom arm has a proximal end connected to the rod, and the device is The apparatus according to claim 1, further comprising a mounting bracket that facilitates the connection of a load to the distal end of the boom arm opposite to the proximal end.

4. The apparatus according to claim 3, wherein the mounting bracket has a plurality of pick points that facilitate the connection of the load to the distal end of the boom arm.

5. The apparatus according to claim 4, wherein the plurality of pick points include first and second pick points positioned in close proximity to opposite ends of the mounting bracket.

6. The boom arm has a proximal end connected to the rod, and the device is The apparatus according to any one of claims 1 to 5, further comprising a mounting bracket connected to the distal end of the boom arm opposite to the proximal end and an adjustment mechanism interposed between the boom arm, wherein the adjustment mechanism facilitates angular adjustment of the mounting bracket in a cross-section perpendicular to the centerline of the boom arm.

7. The apparatus according to claim 6, wherein the adjustment mechanism further facilitates the adjustment of the distance between the mounting bracket and the mast.

8. The apparatus according to claim 6, wherein the boom arm is detachably connected to the mounting bracket via the adjustment mechanism.

9. The boom arm has a proximal end connected to the rod, and the device is The apparatus according to claim 1, further comprising a mounting bracket connected to the distal end of the boom arm opposite to the proximal end and an adjustment mechanism interposed between the boom arm, wherein the adjustment mechanism facilitates adjustment of the distance between the mounting bracket and the mast.

10. The boom arm has a proximal end connected to the rod, and the device is The apparatus according to claim 1, further comprising a mounting bracket connected to the distal end of the boom arm opposite to the proximal end and an adjustment mechanism interposed between the boom arm, wherein the adjustment mechanism facilitates angular adjustment of the mounting bracket with respect to the boom arm.

11. The boom arm is connected to a rod located within a shaft mechanism positioned within a mast extending vertically from a base structure, wherein the rotation of the rod facilitates the sustained rotation of the boom arm around the longitudinal axis of the rod relative to the base structure, and the boom arm includes a proximal end connected to the rod. A device comprising a mounting bracket connected to the distal end of the boom arm, which facilitates the connection of a load to the distal end of the boom arm, opposite to the proximal end, wherein the mounting bracket includes a plurality of pick points that facilitate the connection of the load to the distal end of the boom arm.

12. A shaft mechanism located within a mast extending vertically from a base structure, wherein the shaft mechanism supports a boom arm; and A rod disposed within the shaft mechanism, wherein the rotation of the rod facilitates the sustained rotation of the boom arm around the vertical axis of the rod relative to the base structure. Equipped with, A device wherein the shaft mechanism is adjustable along the longitudinal axis relative to the mast to facilitate adjustment of the distance between the proximal end of the boom arm connected to the shaft mechanism and the base structure.

13. The apparatus according to claim 11, wherein the shaft mechanism has a stainless steel cylinder.

14. A bushing interposed between the shaft mechanism and the mast, in close proximity to the base structure, in close proximity to the boom arm, or in a combination thereof. The apparatus according to claim 12 or 13, further comprising:

15. The apparatus according to claim 14, wherein the bushing is in contact with the inner wall of the mast and the outer wall of the shaft mechanism.

16. The apparatus according to any one of claims 12 to 15, wherein the base structure is fixed to a frame supporting a load, a surface supporting the frame, or a combination thereof.

17. A shaft mechanism located within a mast extending vertically from a base structure, wherein the shaft mechanism supports the boom arm; A rod disposed within the shaft mechanism, wherein the rotation of the rod facilitates the sustained rotation of the boom arm around the longitudinal axis of the rod relative to the base structure, and the boom arm has a proximal end connected to the shaft mechanism; and A device comprising a mounting bracket connected to the distal end of the boom arm, which facilitates the connection of a load to the distal end of the boom arm, opposite to the proximal end, wherein the mounting bracket includes a plurality of pick points that facilitate the connection of the load to the distal end of the boom arm.

18. A rod housed in a shaft mechanism located within a mast extending from the base structure; A boom arm connected to the rod via its proximal end, wherein the boom arm is continuously rotatable around the longitudinal axis of the rod relative to the base structure; and A mounting bracket that facilitates the attachment of a load to the distal end of the boom arm opposite to the proximal end of the boom arm connected to the rod. Equipped with, A device wherein the shaft mechanism is adjustable along the longitudinal axis relative to the mast to facilitate adjustment of the distance between the proximal end of the boom arm connected to the shaft mechanism and the base structure.

19. The system further comprises one or more adjustment mechanisms, the one or more of which facilitate adjustment of the angular direction of the boom arm relative to the mast; the angular direction of the mounting bracket in a cross-section perpendicular to the centerline of the boom arm; the distance between the mounting bracket and the mast; the angular direction of the mounting bracket relative to the boom arm; or a combination thereof. The apparatus according to claim 18.

20. A rod disposed within a mast extending from a base structure; A boom arm connected to the rod via its proximal end, wherein the boom arm is capable of continuous rotation around the longitudinal axis of the rod relative to the base structure; A mounting bracket that facilitates the attachment of a load to the distal end of the boom arm, opposite to the proximal end of the boom arm connected to the rod; and A device comprising one or more adjustment mechanisms to facilitate angular adjustment of the mounting bracket with respect to the centerline of the boom arm.

21. A mast extending vertically from the base structure; A shaft mechanism disposed within the mast; and A rod connected to the boom arm and positioned within the shaft mechanism, wherein the rotation of the rod facilitates the sustained rotation of the boom arm around the vertical axis of the rod relative to the base structure. Equipped with, A jib crane in which the shaft mechanism is adjustable along the longitudinal axis relative to the mast to facilitate adjustment of the distance between the proximal end of the boom arm connected to the shaft mechanism and the base structure.

22. A mounting bracket that facilitates the connection of a load to the distal end of the boom arm opposite to the proximal end of the boom arm connected to the rod, The jib crane according to claim 21, further comprising:

23. A bushing interposed between the shaft mechanism and the mast, either in close proximity to the base structure or in close proximity to the boom arm. The jib crane according to claim 21 or 22, further comprising:

24. An adjustment mechanism interposed between the boom arm and the rod, which facilitates the angular adjustment of the boom arm relative to the mast. A jib crane according to any one of claims 21 to 23, further comprising:

25. The jib crane according to claim 24, wherein the boom arm is detachably connected to the rod via the adjustment mechanism.

26. The jib crane according to claim 21, wherein the base structure is fixed to a surface via a plurality of mounting mechanisms.

27. A mast extending vertically from the base structure; A shaft mechanism located within the mast; A rod connected to a boom arm and positioned within the shaft mechanism, wherein the rotation of the rod facilitates the sustained rotation of the boom arm about the longitudinal axis of the rod relative to the base structure; A mounting bracket connected to the distal end of the boom arm, which facilitates the attachment of a load to the distal end of the boom arm opposite to the proximal end of the boom arm connected to the rod, wherein the mounting bracket includes a plurality of pick points that facilitate the attachment of the load to the distal end of the boom arm; and An adjustment mechanism interposed between the boom arm and the mounting bracket, wherein the adjustment mechanism facilitates the adjustment of the distance between the mounting bracket and the mast. A jib crane equipped with a jib crane.

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