MOUNTING A ROBOTIC ARM IN AN INVERTED POSITION TO SUSPEND AN ELECTRICAL BYPASS

Abstract

A method and apparatus to invert a robotic arm, includes an angling adaptor and swing arm. The angling adaptor includes a truck or crane boom head adaptor and a hinge coupler. The swing arm extends downwardly from the angling adaptor and may include a boom adaptor arm and a jib. The lower end of the swing arm is mounted to the main beam of the robotic arm. The hinge coupler mounts to the upper end of the crane or truck boom. The robotic arm is mounted on the swing arm so as to downwardly orient the insulators on the robotic arm. A lowermost end of each insulator is adapted for releasably holding an electrical bypass which may include a bus bar and electrical cable jumpers.

Claims

1. An apparatus for mounting a robotic arm in an inverted position to suspend an electrical bypass, the apparatus comprising: a) a releasably lockable hinge coupler having a pivot linkage, wherein said hinge coupler is adapted for mounting to a free end of a crane or truck boom, and wherein in a normal operating orientation the boom has a range of motion sweeping an angular orientation between substantially horizontal and substantially vertical, b) an elongate, directionally reversible boom adapter arm having opposite first and second ends, wherein the first end of said boom adapter arm is pivotally mounted on said pivot linkage for releasably lockable pivoting about said pivot linkage relative to said hinge coupler, whereby said boom adapter arm is selectively orientable relative to said crane or truck boom between a downwardly oriented operational position relative to said boom and an in-line transport position substantially in-line with the long axis of the boom, and c) said second end of said boom adapter arm mounted to a robotic arm jib and a selectively positionable elongate robotic arm, d) said robotic arm having at least one downwardly extending elongate electrical insulator depending downwardly therefrom in oppositely disposed relation to said boom adapter arm relative to said robotic arm, wherein a lowermost free end of said at least one downwardly extending elongate electrical insulator is adapted for releasably holding an electrically energized electrical bypass, e) an actuator cooperating between said robotic arm jib and said robotic arm for selective rotation of said robotic arm relative to said boom adapter arm and robotic arm jib.

2. The apparatus of claim 1 further comprising a crane or truck boom adaptor mountable between the crane or truck boom and the hinge coupler, wherein said hinge coupler includes a housing supporting said pivot linkage, and wherein said housing is mountable to the boom adaptor.

3. The apparatus of claim 2 wherein said pivot linkage includes a pin mounted through said housing, and wherein said first end of said boom adapter arm pivots about said pin and said boom adapter arm extends downwardly from said housing.

4. The apparatus of claim 2 wherein said housing has side walls having locking-pin receiving holes therein arrayed in an arc about said pivot linkage and said boom adapter arm has a locking-pin aperture to receive a locking pin therein, wherein said boom adapter arm is pivotable about said pivot linkage so as to align a selected one of said locking pin receiving holes in said housing with said locking pin aperture for receiving a locking pin through said selected one of said locking pin receiving hole and said locking pin aperture to thereby lock said orientation of said boom adapter arm relative to said hinge coupler.

5. The apparatus of claim 1 wherein in said operational position said boom adapter arm and robotic arm jib are selectively orientable downwardly relative to a long axis of said crane or truck boom so as to form an included angle between the boom and the boom adapter arm in the range of 60-120 degrees.

6. The apparatus of claim 1 wherein said electrical bypass includes a bus bar and wherein the bus bar is coupled to the lowermost free end of said at least one downwardly extending elongate electrical insulator.

7. The apparatus of claim 6 wherein said electrical bypass further comprises electrical cables electrically connected to opposite ends of said bus bar, whereby said bus bar and cables are positionable over, and electrically connectable around an energized electrical component so as to electrically bypass said electrical apparatus or switch for servicing or replacement of said electrical component once de-energized.

8. The apparatus of claim 7 wherein said electrical component is a switch.

9. The apparatus of claim 1 wherein said at least one electrical insulator is a plurality of electrical insulators.

10. The apparatus of claim 9 wherein said plurality of electrical insulators includes one insulator for each phase of three phase conductors.

11. The apparatus of claim 9 wherein said electrical bypass includes a bus bar coupled to the lowermost free end of said at least one downwardly extending elongate electrical insulator.

12. The apparatus of claim 11 wherein said bypass further comprises electrical cables electrically connected to opposite ends of said bus bar, whereby said bus bar and cables are positionable over, and electrically connectable around an energized electrical component so as to electrically bypass said component for servicing or replacement of said component once de-energized.

13. The apparatus of claim 12 wherein said component is a switch.

14. The apparatus of claim 13 wherein said robotic arm is telescopically extendable in length.

15. The apparatus of claim 1 wherein said swing arm includes a boom adaptor arm and an electrically insulated robotic arm jib mounted end-to-end to one another.

16. The apparatus of claim 15 wherein said swing arm is at least substantially 12 feet long.

17. The apparatus of claim 12 wherein said swing arm and said robotic arm lie substantially in a common plane.

18. The apparatus of claim 17 wherein said robotic arm is positionable by said actuator so as to rotate said robotic arm in said common plane.

19. The apparatus of claim 5 wherein said range is 75-105 degrees.

20. The apparatus of claim 19 wherein said included angle is substantially 90 degrees.

21. The apparatus of claim 17 wherein said swing arm is substantially linear.

22. The apparatus of claim 15 wherein said boom adaptor arm and said robotic arm jib are of substantially equal length.

23. A method of using the apparatus of claim 1, the method comprising the steps of: a) with the crane or truck boom retracted and lowered, mounting the hinge coupler onto the end of the boom and mounting the swing arm onto the hinge coupler, b) adjusting the angle of the swing arm into its operational position relative to the boom, and mounting the inverted robotic arm to the free end of the swing arm so that the insulators on the robotic arm depend downwardly, c) coupling the lower ends of the insulators to corresponding electrical bypasses, d) elevating the boom, swing arm, robotic arm and electrical bypasses mounted there under so as to position the bypasses over electrical components needing repair or maintenance, e) connecting the bypasses so as to electrically bypass the electrical components, f) de-energizing the electrical components for repair, maintenance or replacement.

24. The method of claim 23 wherein said electrical bypass includes a bus bar and wherein the bus bar is coupled to the lowermost free end of said at least one downwardly extending elongate electrical insulator.

25. The method of claim 24 wherein said electrical bypass further comprises electrical cables electrically connected to opposite ends of said bus bar, whereby said bus bar and cables are positionable over, and electrically connectable around an energized electrical component so as to electrically bypass said component for servicing or replacement of said component once de-energized.

26. The method of claim 25 wherein said component is a switch.

27. The method of claim 23 wherein said at least one electrical insulator is a plurality of electrical insulators.

28. The method of claim 27 wherein said plurality of electrical insulators includes one or more insulator for each phase of three phase conductors.

29. The method of claim 28 wherein said electrical bypass includes a bus bar coupled to the lowermost free end of said at least one downwardly extending elongate electrical insulator.

30. The method of claim 29 wherein said bypass further comprises electrical cables electrically connected to opposite ends of said bus bar, whereby said bus bar and cables are positionable over, and electrically connectable around an energized electrical component so as to electrically bypass said component for servicing or replacement of said component once de-energized.

31. An apparatus for mounting a robotic arm in an inverted position to suspend an electrical bypass, the apparatus comprising: a) a releasably lockable hinge coupler having a pivot linkage, wherein said hinge coupler is adapted for mounting to a free end of a crane or truck boom, b) an elongate, directionally reversible boom swing arm having opposite first and second ends, wherein the first end of said boom swing arm is pivotally mounted on said pivot linkage for releasably lockable pivoting about said pivot linkage relative to said hinge coupler, whereby said boom swing arm is selectively orientable relative to said boom between a downwardly oriented operational position relative to said boom and an in-line transport position substantially in-line with the long axis of the boom, and c) a selectively positionable elongate robotic arm having at least one downwardly extending elongate electrical insulator depending downwardly therefrom in oppositely disposed relation to said boom adapter arm relative to said robotic arm, wherein a lowermost free end of said at least one downwardly extending elongate electrical insulator is adapted for releasably holding an electrically energized electrical bypass, d) said second end of said boom swing arm mountable to said elongate robotic arm, e) an actuator configured to cooperate between said swing arm and said robotic arm to selectively rotate said robotic arm relative to said swing arm.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The exemplary embodiments may be better understood, and numerous objects, features, and advantages made apparent to those skilled in the art by referencing the accompanying drawings. These drawings are used to illustrate only exemplary embodiments, and are not to be considered limiting of its scope, for the disclosure may admit to other equally effective exemplary embodiments. The figures are not necessarily to scale and certain features and certain views of the figures may be shown exaggerated in scale or in schematic in the interest of clarity and conciseness.

[0020] FIG. 1 is, in perspective view, an inverted LineMaster™ robotic arm mounted on the lower end of a downwardly inclined boom adapter arm which is pivotally mounted to a crane or truck boom head adapter, showing three parallel electrical bus bars held underneath the robotic arm on the end of downwardly extending electrical insulators.

[0021] FIG. 2 is, in front elevation view, the inverted robotic arm system of FIG. 1.

[0022] FIG. 3 is, in side elevation view, the inverted robotic arm system of FIG. 1.

[0023] FIG. 4 is a cross-sectional view along line B-B in FIG. 2.

[0024] FIG. 5 is, in perspective view, the crane or truck boom head adapter and boom adapter arm of FIG. 1 showing the upper elongate boom adapter arm and lower robotic arm jib assembly forming a swing arm, with the swing arm angled off 90 degrees from the crane or truck boom head adapter so as to be rotated backwardly towards the main boom at 15 degrees.

[0025] FIG. 6 is, in side elevation view, the crane or truck boom head adapter and swing arm of FIG. 5. The crane or truck boom is illustrated angled upwardly at 45 degrees.

[0026] FIG. 7 is the perspective view of FIG. 5 showing the boom adapter arm inclined 15 degrees off 90 degrees relative to the crane or truck boom head adapter so as to rotate the swing arm 15 degrees away from perpendicular to the main boom.

[0027] FIG. 8 is the swing arm and crane or truck boom head adapter of FIG. 7 shown in side elevation view.

[0028] FIG. 9 is the swing arm and crane or truck boom head adapter of FIG. 5 with the elongate boom adapter pivoted relative to the boom head adapter so as to be in line with the main boom.

[0029] FIG. 10 is, in side elevation view, the swing arm and boom head adapter of FIG. 9.

[0030] FIG. 11 is, in perspective view, the hinge coupling of the crane or truck boom head adapter of FIG. 5.

[0031] FIG. 12 is, in perspective view, the elongate boom adapter arm of FIG. 5.

[0032] FIG. 13 is, in perspective view, the elongate boom adapter arm and hinge coupler rotated 15 degrees back of FIG. 5.

[0033] FIG. 14 is, in side elevation view, the elongate boom adapter arm and hinge coupler of FIG. 13.

[0034] FIG. 15 is, in perspective view, the elongate boom adapter arm and hinge coupler rotated ahead 15 degrees of FIG. 7.

[0035] FIG. 16 is, in side elevation view, the elongate boom adapter arm and hinge coupler of FIG. 15.

[0036] FIG. 17 is, in perspective view, the boom adapter arm mounted at 90 degrees on the hinge coupler so as to be 90 degrees to the main boom.

[0037] FIG. 18 is, in side elevation view, the boom adapter arm and hinge coupler of FIG. 17.

[0038] FIG. 19 is, in perspective view, the swing arm and crane or truck boom head adapter system of FIG. 5 mounted on a truck or crane boom and suspending three parallel bus bars attached to corresponding electrical insulators depending from an inverted robotic arm mounted on the lower end of the boom adapter arm.

[0039] FIG. 20 is the system of FIG. 19 shown mounted on a crane or truck boom and positioned so that the bus bars are above and parallel with three corresponding switches needing replacement or maintenance.

[0040] FIG. 21 is the system of FIG. 20 showing the deployment of jumper cables mounted off the end of each bus bar and electrically connected to corresponding conductors on each side of each switch thereby paralleling the electrical load around each switch.

[0041] FIG. 22 is the system deployment view of FIG. 21 showing the switches now in their open position to thereby transferring the electrical load through the jumpers and bus bars thereby allowing for maintenance or replacement of the switches.

[0042] FIG. 23 is the system deployment view of FIG. 22 from a perspective showing an in-line view of the electrical bypass around each switch.

[0043] FIG. 24 is the system deployment view of FIG. 20 showing the bus bars positioned above and aligned with elevated pole-mounted switches and with the inverted robotic arm correspondingly elevated by extension of the crane or truck boom.

[0044] FIG. 25 is the system deployment view of FIG. 24 showing the jumper cables deployed and connected down onto each conductor on each side of the pole—mounted switches so as to parallel the electrical load around each switch.

[0045] FIG. 26 is the system deployment view of FIG. 25 showing the switches now in their open position so as to transfer the electrical load through the jumper cables and bus bars allowing for maintenance or replacement of the switches.

[0046] FIG. 27 is the system deployment view of FIG. 26 showing the switch jumper cables removed from between the switches and their corresponding conductors thereby isolating and de-energizing each pole-mounted switch allowing for maintenance or replacement of the switches.

[0047] FIG. 28 is a further perspective view of the system deployment view of FIG. 27 showing an in line view of the bypassed pole-mounted switches.

[0048] FIG. 29 is an example of a load chart showing allowable working heights and working radiuses for a crane or truck boom supporting an inverted robotic arm system and electrical bypass.

DETAILED DESCRIPTION

[0049] The description that follows includes exemplary apparatus, methods, techniques, and instruction sequences that embody techniques of the inventive subject matter. However, it is understood that the described embodiments may be practiced without these specific details.

[0050] In order to invert a robotic arm such as a LineMaster™ robotic arm which is typically used with station class electrical insulators, the uppermost end of a boom such as a crane or truck boom, on which the robotic arm is mounted, is adapted to allow reorientation of the robotic arm so as to invert it. A hinge coupler and boom adapter arm to reorient the robotic arm relative to the long axis of the crane or truck boom are therefore provided. The hinge coupler and crane or truck boom adaptor connect the boom adapter arm to the crane or truck boom. The swing arm, which extends downwardly from the hinge coupler, may include a boom adaptor arm and an electrically insulated robotic arm jib. The lower end of the swing arm is mounted to the main beam of the robotic arm. The hinge coupler is advantageously releasably lockable and may include a pivot linkage. The hinge coupler is adapted for mounting to the crane or truck boom adapter on the upper, free end of the crane or truck boom. In one example the crane or truck boom is retractable and extendable, and may be rotated about its base between substantially horizontal and substantially vertical positions. The crane or truck boom may be mounted on the back of a flatbed truck. As would be known to those skilled in the art, other forms of booms may also be used.

[0051] The swing arm may for example include the elongate, directionally reversible boom adaptor arm mounted end-to-end to the robotic arm jib. A first, upper end of the swing arm is pivotally mounted on the pivot linkage in the hinge coupler for releasably lockable pivoting of the swing arm about the pivot linkage relative to the free end of the crane or truck boom. The swing arm is thereby selectively orientable relative to the crane or truck boom between a downwardly oriented operational position relative to the crane or truck boom within an angular range better described below and an in-line position substantially in-line with the long axis of the crane or truck boom. The in-line position is useful for transportation of the boom adapter arm and robotic arm. The second, lower, end of the swing arm is mounted to a selectively positionable elongate robotic arm such as a LineMaster™ robotic arm.

[0052] The robotic arm is mounted upside down on the second end of the swing arm so as to downwardly orient the insulators mounted on the robotic arm. For example, for use on live conductors of three phase AC circuit, the robotic arm will advantageously have three correspondingly spaced apart insulators. The insulators may be station class insulators. The robotic arm may also be used for live DC conductors, in which case the robotic arm will have at least one, and likely two, downwardly extending insulators extending downwardly therefrom. When the insulators are oriented downwardly they may be described as being in oppositely disposed in relation to the main beam of the robotic arm; that is, on opposite sides of the robotic arm. A lowermost free end of each insulator is adapted for releasably holding an electrically energized electrical bypass which may include a rigid bus bar.

[0053] An actuator cooperates between the swing arm and the robotic arm for selective rotation of the robotic arm relative to the swing arm while the robotic arm is inverted. This is useful if for example the robotic arm is holding, suspended beneath it, a bus bar for electrically bypassing an electrical component needing repair or maintenance, such as a switch. The electrical component may be at a relatively low height above ground or may be significantly elevated such as on a pole structure or tower. The bus bar, which may for example be a metal, such as aluminum, bar, is suspended below the robotic arm on the electrical insulators depending downwardly from the robotic arm. In use then, the robotic arm is first lowered to for example the level of the truck and the bus bars are connected to the lowermost ends of the insulators on the robotic arm. Because the bus bars are being used to bypass elevated electrical components, such as switches, jumper cables or the like are connected to either end of each bus bar for attachment to the corresponding conductors which are connected on opposite sides of the electrical component requiring maintenance.

[0054] With the swing arm fixed in its position angled downwardly from the end of the crane or truck boom, and with the bus bars and jumper cables mounted under the robotic arm and otherwise ready for use, the robotic arm is raised by extension of the crane or truck boom and the boom oriented to position the robotic arm and bus bars over the electrical component. The robotic arm and boom orientation is adjusted using the robotic arm's actuator and the boom actuator on the truck so that the bus bars are in their operative position, for example, parallel with the long axes of each switch and their corresponding conductors which extend from each switch. The crane or truck boom is then used to lower the bus bars until the jumper cables can be electrically connected to the conductors so as to affect the bypass of each switch.

[0055] Once the repair, maintenance or replacement of the electrical apparatus or switches has been done, the jumper cables may be removed and the robotic arm and the bus bars lifted out of the way. The robotic arm and bus bars may then be returned to the ground or truck-level to have the bus bars removed from the robotic arm for transport, or the whole system may be moved to an adjacent work site for the repair, maintenance or replacement of other electrical components. If the bus bars are removed so that the robotic arm and boom can be transported, the crane or truck boom is retracted and lowered onto the boom rest, the swing arm is rotated on the hinge coupler so as to be in-line with the end of the crane or truck boom, and the robotic arm is articulated into a position convenient for transportation or for removal from the end of the swing arm.

[0056] In one embodiment, not intended to be limiting, the hinge coupler supports the pivot linkage. The hinge coupler is mountable to a crane or truck boom adaptor, for example a crane boom adaptor in the case of a crane boom, mounted onto the free end of the boom. The pivot linkage may include a pin or other hinge mechanism mounted through or in the hinge coupler. The first end of the boom adapter arm pivots about the pin or other hinge mechanism so as to allow the boom adapter arm to rotate downwardly so that it extends inclined downwardly from the hinge coupler, and thus is inclined downwardly from the end of the crane or truck boom.

[0057] In the particular hinge coupler illustrated, which again is not intended to be limiting, has side walls having locking-pin receiving holes therein arrayed in an arc about the pivot linkage and the boom adapter arm has a locking-pin aperture to receive a locking pin therein. The boom adapter arm is thus pivotable about the pivot linkage so as to align a selected one of the locking pin receiving holes in the hinge coupler with the locking pin aperture in the boom adapter arm. The locking pin is inserted through the desired locking pin receiving hole in the hinge coupler side walls and locking pin aperture in the boom adapter arm to thereby lock the orientation of the boom adapter arm relative to the hinge coupler. In the illustrated examples the boom adapter arm may be locked so as to extend at 90 degrees from the hinge coupler. The angle may be adjusted so that the boom adapter arm is offset by 15 degrees on either side of the 90 degree orientation.

[0058] When in its operational position the crane or truck boom may be inclined upwardly at approximately 45 degrees for example, and the boom adapter arm downwardly inclined at between about 75 degrees and 105 degrees (measured as the included angle between the crane or truck boom and the upper end of the boom adapter arm). In other embodiments the boom adapter arm may be selectively orientable downwardly relative to the crane or truck boom through a wider angular range of motion.

[0059] In one preferred embodiment the swing arm is for example substantially 12 feet long and may consist of two components; an elongate boom adaptor arm closest to the hinge coupler and the robotic arm jib extending from the boom adaptor arm to the robotic arm.

[0060] Advantageously the swing arm and the robotic arm lie substantially in a common plane, and the actuator rotates the robotic arm in that common plane. In further embodiments the actuator or a further actuator (not shown) rotates the robotic arm out of the common plane. The actuator may include a hydraulic cylinder acting between the robotic arm jib and the robotic arm, and may also include a scissor linkage for increased angular range of motion of the robotic arm.

[0061] As seen in FIG. 1, the inverted robotic arm system 10 includes a crane or truck boom adapter 12 mounted to a hinge coupler 14, which collectively form an angling adapter 16. Crane or truck boom head adapter 12 mounts onto the uppermost end of crane or truck boom 18. Boom 18 is, in operation, angled upwardly by angle alpha (α) relative to the horizontal. As seen in FIG. 6, wherein boom 18 is shown in dotted outline, angle alpha may for example be about 45 degrees. A boom adapter arm 20 is pivotally mounted to hinge coupler 14 so as to depend downwardly therefrom, and in particular, so as to form an included angle beta (B), seen in FIG. 6, between boom adapter arm 20 and crane or truck boom 18. A robotic arm jib 22 is mounted to the lowermost end of boom adapter arm 20 so as to extend approximately linearly therefrom. Collectively, boom adapter arm 20 and robotic arm jib 22 form swing arm 24.

[0062] Robotic arm jib 22 may be mounted in-line with boom adapter arm 20 or, as illustrated, may be angled slightly further downwardly relative to boom adapter arm 20 so as to form an included angle C of for example approximately 165 degrees, again as seen in FIG. 6. A robotic arm 26 is pivotally mounted to the lowermost end of robotic arm jib 22 for rotation in a plane, referred to herein as the common plane, which includes swing arm 24 and robotic arm 26. An actuator such as hydraulic cylinder 28 is mounted so as to cooperate between robotic arm jib 22 and robotic arm 26 so as to selectively angularly position robotic arm 26 relative to robotic arm jib 22.

[0063] In one embodiment, not intended to be limiting, robotic arm 26 may be a Linemaster™ robotic arm having a main beam 26a pivotally mounted to robotic arm jib 22, and having selectively extendable telescopic arms 26b extending telescopically and linearly from opposite ends of main beam 26a. In the illustrated example, not intended to be limiting, three station class electrical insulators 30 are mounted so as to depend downwardly from robotic arm 26. In particular, one insulator 30 extends downwardly from either end of extendable telescopic arms 26b and a third insulator 30 extends downwardly from a position midway along main beam 26a. Rigid bus bars 32 are mounted to the lowermost ends of insulators 30, midway along the length of the bus bars. In this fashion, when the system 10 of FIG. 1 is mounted onto the upper end of a crane or truck boom 18, system 10 may be positioned over electrical components such as electrical switches 34, seen commencing in FIG. 20, so as to repair, maintain or replace the electrical component. In a preferred embodiment, robotic arm jib 22 is an insulated section made from a rigid dielectric material such as for example fiberglass.

[0064] As better seen in FIG. 3, insulators 30 may be angled outwardly from the ends of extendable telescopic arms 26b if it is desired to increase the spacing between bus bars 32 in order to match the spacing between the electrical apparatus or switches on, in this case, the three conductors 36.

[0065] As seen commencing in FIG. 19, it may be that insulators 30 depend vertically downwardly from robotic arm 26, again depending on the required spacing between the electrical components being serviced or replaced. As seen commencing in FIG. 4, boom adapter arm 20 is pivotally mounted within hinge coupler 14 by means of a hole and pin arrangement. In particular, and without intending to be limiting, the upper end of boom adapter arm 20, labeled in FIG. 4 for ease of reference as end 20a has a hole through which is journaled a pin 14a, about which boom adapter arm 20 may be pivoted in direction A. Once boom adapter arm 20 is pivoted in direction A to the desired orientation, a second pin 14b is inserted into a corresponding hole in boom adapter arm 20, which corresponds to matching holes in the side walls 14c of hinge coupler 14 as better seen for example commencing in FIG. 13.

[0066] Thus as seen in FIGS. 13 and 14, boom adapter arm 20 is free to rotate about pin 14a when mounted between sidewalls 14c so as to angularly position boom adapter arm 20 to a desired angular orientation relative to hinge coupler 14. Once in the desired orientation, pin 14b is inserted through correspondingly placed holes in sidewalls 14c and through the corresponding hole through boom adapter arm 20 so as to releasably lock boom adapter arm 20 in its desired position. In the orientation of FIGS. 13 and 14, boom adapter arm 20 is fixed in a position rotated 15 degrees back from the 90 degree position seen in FIGS. 17 and 18 so as to be angled 15 degrees closer to crane or truck boom 18. In FIGS. 15 and 16 boom adapter arm 20 is angled oppositely so as to be angled 15 degrees ahead of the 90 degree position seen in FIGS. 17 and 18, thereby angling boom adapter arm 20 15 degrees further away from crane or truck boom 18.

[0067] One example of a hinge coupler 14 is seen in FIG. 11 where holes 38 are clearly seen through which pin 14a is inserted. Holes 40 are also clearly seen through which pin 14b is inserted depending on the desired angular position of boom adapter arm 20 when pivoted in direction A about pin 14a.

[0068] One example of boom adapter arm 20 is shown illustrated in FIG. 12. The uppermost hole 20b in end 20a of boom adapter arm 20 is the hole through which pin 14a is inserted to allow the pivoting of boom adapter arm 20 in direction A. Hole 20c is provided for the insertion of pin 14b so as to lock the angular orientation of boom adapter arm 20 about pin 14a. Hole 20d is provided when it is desired to rotate boom adapter arm 20 so as to be in line with crane or truck boom 18. As seen in FIG. 9, pin 14b is inserted through holes 42 in hinge coupler 14 and through hole 20d in boom adapter arm 20.

[0069] Moving now to the system implementation in the two examples illustrated in FIGS. 19 through 28, an inverted robotic arm system 10 is shown in FIG. 19 mounted onto the upper end of a retracted crane or truck boom 18. Boom 18 is angled upwardly at 45 degrees. As may be seen in FIG. 19, in addition to the inverted robotic arm system 10 of FIG. 1, flexible electrically conductive jumper cables 44 are mounted to the opposite ends of bus bars 32 so as to be electrically connected thereto. In FIG. 19 jumper cables 44 are folded up on top of bus bars 32 so as to conveniently store them during the positioning of system 10 over the electrical components, such as switches 34, to be maintained or replaced.

[0070] As seen in FIG. 20, switches 34 are mounted on insulators 46. Insulators 46 are themselves mounted on switch bases 48. Live conductors 36 are mounted on opposite ends of each of the three switches 34 corresponding to three phase conductors. Conductors 36 and switches 34 are parallel and equally spaced apart relative to one another. As seen in FIG. 20, system 10 is positioned so that bus bars 32 are directly above and parallel with switches 34 and the corresponding adjacent ends of conductors 36.

[0071] As seen in FIG. 21, with the bus bars 32 positioned above switches 34, jumper cables 44 are deployed from their storage position on bus bars 32 and electrically connected down onto their corresponding live conductors 36. The line load in conductors 36 is thus paralleled around each of the switches 34 along the corresponding electrical paths through jumper cables 44 and bus bars 32.

[0072] FIG. 22 illustrates where switches 34 have been opened so as to break the electrical connection thereby transferring the entire electrical load from conductors 36 around the bypass formed by jumper cables 44 and their corresponding bus bars 32. Switches 34 may now be repaired or replaced as required.

[0073] In FIGS. 24-28 the same bypass procedure as illustrated in FIGS. 20-23 is set out again, the only difference being that switches 34 are mounted on high-rise supports such as the illustrated pole structures 50. As may be seen, in order to properly orient and position system 10 over switches 34, crane or truck boom 18 is extended from its retracted position of FIG. 19.

[0074] As seen in the load chart of FIG. 29, when system 10 is mounted as described above onto crane or truck boom 18 so as to support bus bars 32 and jumper cables 44 for electrical bypass of electrical components as also described above by way of example, the range of motion of the crane or truck boom is constrained so as to not exceed the safe work load of the inverted robotic arm and capacity of the crane or truck boom. In the illustrated example of FIG. 29, an inverted LineMaster™ model 9201 robotic arm is supported from the upper end of the crane or truck boom on an Altec model AC-38-127S-EJ crane. 45 inch station class insulators (Sediver™ with heavy duty adaptor kits) mounted on the robotic arm provide a per phase loading allowance in direction P of approximately 300 lbs. vertical. An operating envelope E, plotted as the limits of working height versus working radius of the boom relative to the crane or truck, is outlined by way of example in FIG. 29, outside of which bus bars 32 are not permitted so as to not exceed the safe work load of the inverted robotic arm and capacity of the crane or truck boom.

[0075] While the embodiments are described with reference to various implementations and exploitations, it will be understood that these embodiments are illustrative and that the scope of the inventive subject matter is not limited to them. Many variations, modifications, additions, and improvements are possible.

[0076] Plural instances may be provided for components, operations or structures described herein as a single instance. In general, structures and functionality presented as separate components in the exemplary configurations may be implemented as a combined structure or component. Similarly, structures and functionality presented as a single component may be implemented as separate components. These and other variations, modifications, additions, and improvements may fall within the scope of the inventive subject matter.