FORM 2
THE PATENTS ACT,
1970 (39 of 1970)
&
THE PATENTS RULES, 2003
COMPLETE SPECIFICATION (See section 10, rule 13)
1. Title of the invention: A MODULAR INSULATOR LESS CANTILEVER SYSTEM FOR
SUPPORTING OVERHEAD CABLES
2. Applicant(s)
NAME NATIONALITY ADDRESS
RAYCHEM RPG PVT. LTD Indian RPG House 463, Dr. Annie Besant Road, Mumbai, Maharashtra 400 030, India
3. Preamble to the description
COMPLETE SPECIFICATION
The following specification particularly describes the invention and the manner in which it
is to be performed.

TECHNICAL FIELD [0001] The present subject matter relates, in general, to an insulator less cantilever system for overhead electrical lines, and more particularly to modular insulator less cantilever systems for supporting the overhead electrical line of a railway, tram, or trolleybus system.
BACKGROUND [0002] Electrification of transport vehicles is a well-known means for providing power to transport vehicles, in particular public transport vehicles, and is becoming increasingly popular as the need to reduce carbon emissions grows. Overhead line electrification is an established means of providing this electrification.
[0003] Overhead electric traction system for electric trains consists of an upper, weight-carrying wire (known as a catenary cable) from which is suspended a contact cable. The electric trains include a pantograph which is spring-loaded and pushes a contact shoe up against an underside of the contact cable to draw current needed to run the electric trains. The contact cable is supported at spaced positions along its length by droppers from the catenary cable which are strung between a cantilever system located at spaced positions along the length of a track of the electric trains. [0004] The cantilever system supports the catenary cable and the contact cable in the required position over the electric trains and insulates the overhead electric traction system. The design of the cantilever system depends on the mechanical and electrical requirements of the overhead electric traction system. The cantilever system is insulated swiveling type structural member generally mounted on a post or pole having flexibility with joints having swiveling arrangement permitting movement in all direction. Function of the cantilever system is to keep the overhead electric traction system in a position assisting smooth current collection by the pantograph at the designed speed.

SUMMARY OF THE INVENTION [0005] In an implementation, the present invention provides a modular insulator less cantilever system for supporting overhead electric traction system. The insulator less cantilever system of the invention consists of a frame for mounting the modular insulator less cantilever system on a surface, such that the frame is adapted to swivel about the surface. The frame of the modular insulator less cantilever system comprises a wall mount distal end to mount the frame on the surface. A proximal end of the frame comprises a first arm extending horizontally and a second arm. The first arm consists of a catenary clamp to support a catenary cable positioned atop the first arm. The second arm is attached to an underside of the first arm and extends angularly from the first arm. The second arm is to couple to a register arm and a pull off arm to support a contact cable. The frame of the modular insulator less cantilever system is formed out of a non-metallic material.
[0006] In an example implementation, the non-metallic material can be selected from a group of epoxy molds. The frame of the modular insulator less cantilever system is made of Fibre Reinforced Plastic (FRP).
[0007] In another implementation, the frame for mounting the modular insulator less cantilever system on the surface is a single beam hollow structure made of insulating material.
[0008] In some example implementations, the frame of the modular insulator less cantilever system includes a plurality of grooves adapted to hold a plurality of accessories of the modular insulator less cantilever system in an unassembled manner during transportation and packaging.
[0009] In an embodiment, the second arm of the modular insulator less cantilever system comprises a groove extending along its length adapted to slidably receive the register arm connecting the pull off arm to the contact cable.

[0010] In some cases, the register arm of the modular insulator less cantilever system can be made of the same or different non-metallic material as the frame, while in other cases, the pull off arm of the modular insulator less cantilever system is made of a metallic material.
[0011] Further, in an implementation, the length of the first arm of the modular insulator less cantilever system is adjustable by adjusting a position of the catenary clamp along a length of the first arm, the first arm comprising a plurality of grooves extending throughout its length adapted to slidably adjust the position of the catenary clamp on the first arm.
[0012] These together with other aspects of the invention, along with the various features of novelty that characterize the invention, are pointed out with particularity in the description annexed hereto and forming a part of this disclosure. For a better understanding of the invention, its operating advantages, and the specific objects attained by its uses, reference should be made to the accompanying drawings and descriptive matter in which there are illustrated exemplary embodiments of the invention.
BRIEF DESCRIPTION OF DRAWINGS [0013] The features, aspects, and advantages of the present subject matter will be better understood with regards to the following description and accompanying figures. The use of the same reference number in different figures indicate similar or identical features and components.
[0014] Figure 1 illustrates a schematic side view of the modular insulator less cantilever system, according to one embodiment of the present invention. [0015] Figure 2 illustrates an isometric view of the modular insulator less cantilever system, according to one embodiment of the present invention.

[0016] Figure 3 illustrated a schematic view of the wall mount distal end of the modular insulator less cantilever system, according to one embodiment of the present invention.
[0017] Like names refer to like parts throughout the several view of the drawings. [0018] Person skilled in the art will appreciate that the elements in the figures are illustrated for simplicity and clarity and may not have been drawn to scale. For example, the dimensions of some of the elements in the figure may be exaggerated relative to other elements to help to improve understanding of various exemplary embodiments of the present disclosure. Throughout the drawings, it should be noted that like reference numbers are used to depict the same or similar elements, features, and structures.
DETAILED DESCRIPTION [0019] Overhead electric traction systems require suspending one or more electrically energized cables above a track of an electric train for providing energy to electric trains by means of an electrical pick-up device, typically a pantograph. As may be known, the overhead traction system includes a catenary and a contact cable that are typically suspended from a cantilever system. The cantilever system includes at least one insulator, but preferably single and double/two insulators for providing the isolation for the cantilever system. The cantilever system with a single insulator is preferably used in the tunnels, at curvatures, mostly when the cantilever system is to be mounted to the wall. Further, the double/two insulator cantilever system is preferably used when the cantilever system is to be mounted to a pole or post.
[0020] Conventionally, the cantilever system also includes an upper rigid cantilever arm and a lower rigid cantilever arm. These cantilever arms are attached by their proximal ends via members to a pole positioned next to the track of the electric train. The distal end of the lower rigid cantilever arm is arranged in the tilted orientation, which is further attached to the underside of the upper rigid cantilever arm, which is positioned in a generally horizontal orientation. Due to this, the lower rigid cantilever

arm provides support for the upper rigid cantilever arm. There is a steady arm which is proximally attached to the lower rigid cantilever arm, and a swivel clamp for the contact cable which is typically positioned at the distal end of the steady arm. [0021] The electrically energized cables of the overhead electric traction system need to be electrically insulated from the surrounding environment for practical and safety reasons. Traditionally, this isolation is provided by inserting a plurality of discreet insulators into the body of the upper rigid cantilever arm and the lower rigid cantilever arm of the cantilever system. The insertion of these insulators into the arms of the cantilever assembly complicates the construction of the cantilever system. [0022] The insulators used in the existing cantilever systems are prone to failure. Failure of the insulators often results in the replacement of the entire cantilever systems. Failure of the cantilever systems due to load fluctuation and Series Compensation (SC) is attributable mainly to the insulator of the existing cantilever systems. For instance, more than 90% of failure of the cantilever ystems is due to malfunctioning or other similar issues with the insulator alone. This increases the cost of construction and maintenance of the cantilever system. Further, this may also lead to other problems like downtime of the electric traction systems or safety hazards. [0023] Another drawback of the existing cantilever system is the presence of a high number of components due to which assembling of the cantilever system takes more time. Also, the existing cantilever system requires assembling at a warehouse, and then is dispatched to an installation site as a monolith structure which also poses difficulty in the transportation of the cantilever system.
[0024] Further, in case of any failure in the existing cantilever systems, even if a particular component needs to be repaired or replaced, the entire cantilever system is required to be taken down from the support structure. Another drawback with current cantilever system is the installation time over a pole owing to more numbers of components of the cantilever system.

[0025] Also, the existing cantilever systems belong to various categories and designs which are suitable for multiple applications like single track, multiple tracks, posts, over the curvatures, portals, and most importantly for tunnels. Hence, for each application, a unique system is required to be designed.
[0026] In view of the limitations inherent in the available cantilever systems and in order to overcome the drawbacks of the existing cantilever system, the present invention describes an insulator less modular cantilever system (10) for supporting the overhead electric traction system. The insulator less cantilever system (10) of the invention consists of a frame (20) for mounting the modular insulator less cantilever system (10) on a surface, such that the frame (20) is adapted to swivel about the surface. The frame (20) of the modular insulator less cantilever system (10) comprises a wall mount distal end (30) to mount the frame (20) on the surface. A proximal end (40) of the modular insulator less cantilever system (10) comprises a first arm (50) extending horizontally, the first arm (50) consists of a catenary clamp (60) to support a catenary cable positioned atop the first arm (50). Further, it has a second arm (70) attached to an underside of the first arm (50) and extending angularly from the first arm (50). The second arm (70) is to couple to a register arm (80) and a pull off arm (90) to support a contact cable.
[0027] The above and other features, aspects, and advantages of the subject matter will be better explained with regard to the following description and accompanying figures. It should be noted that the description and figures merely illustrate the principles of the present subject matter along with examples described herein and, should not be construed as a limitation to the present subject matter. It is thus understood that various arrangements may be devised that, although not explicitly described or shown herein, embody the principles of the present disclosure. Moreover, all statements herein reciting principles, aspects, and examples thereof, are intended to encompass equivalents thereof. Further, for the sake of simplicity, and without

limitation, the same numbers are used throughout the drawings to reference like features and components.
[0028] According to an embodiment of the present invention, figure 1 illustrates a schematic side view of a modular insulator less cantilever system (10) for supporting overhead cables. The system comprises the frame (20) for mounting the modular insulator less cantilever system (10) on a surface, such that the frame (20) is adapted to swivel about the surface on which it is mounted. The frame (20) of the modular insulator less cantilever system comprises a wall mount distal end (30) to mount the frame (20) on the surface, and the proximal end (40) which comprises the first arm (50) extending horizontally. The frame (20) of the modular insulator less cantilever system (10) is formed out of an insulating non-metallic material.
[0029] In an example embodiment, the insulating non-metallic material can be selected from a group of epoxy molds. The frame (20) of the modular insulator less cantilever system (10) made of insulating non-metallic material provides for an insulator less modular insulator less cantilever system (10) for overhead application. The non-metallic frame (20) body provides a complete electrical envelope that eliminates the use of the insulators. As will be evident from the foregoing description, elimination of the insulators reduces the failure of the modular insulator less cantilever system (10) caused due to the malfunctioning of the insulators. Consequently, the elimination of the insulators in the modular insulator less cantilever system (10) also reduces the construction and maintenance cost of the insulator less cantilever system. Further, insulator less design provides simple construction of the cantilever system. [0030] Epoxy resins with silica/ mica filling can provide great strength enhancement. Epoxy systems are used in industrial tooling applications to produce molds, master models, laminates, castings, fixtures, and other industrial production aids. This "plastic tooling" replaces metal, wood and other traditional materials, and which generally improves the efficiency and either lowers the overall cost or shortens the lead-time for many industrial processes.

[0031] The insulator less non-metallic design of the modular insulator less cantilever system (10) with electrical envelope, makes onsite working with live insulator less cantilever system (10) possible without posing any threat to the safety of maintenance workers. Moreover, the non-metallic design is more durable as compared to the conventional metallic cantilevers as the non-metallic modular insulator less cantilever system (10) of the present invention is more resistant to corrosion due to the environmental factors.
[0032] In one example embodiment, the frame (20) may comprise a single beam hollow structure. Due to such a construction, that is, the non-metallic single beam hollow structure of the frame (20), the weight of the modular insulator less cantilever system (10) of the present invention is also significantly low.
[0033] According to an embodiment of the present invention, figure 2 illustrates the isometric view of the modular insulator less cantilever system (10) for supporting overhead cables. Figure 2 shows a side view of the modular insulator less cantilever system (10) which depicts the catenary clamp (60), register arm (80), and the pull off arm (90). Further, figure 2 also shows the anti-gravity clamp (110) for the pull off arm (90). In an example, the anti-gravity clamp (110) for the pull off arm (90) may be made of rubber.
[0034] As evident from figure 2, the modular insulator less cantilever system (10) uses a lesser number of components as compared to the conventional cantilever systems, mainly due to the insulator less design. Lower number of components in the modular insulator less cantilever system (10) reduces the assembling time of the insulator less cantilever system. The present invention achieves the same functionality and reliability with a lesser number of components.
[0035] Further, the side view of the modular insulator less cantilever system (10) as shown in figure 2 comprises of plurality of grooves (120) adapted to hold a plurality of accessories of the modular insulator less cantilever system (10) in an unassembled manner during transportation and packaging which eliminates the requirement for

assembling the insulator less cantilever system at a warehouse and dispatching the same to the installation site as a monolith structure.
[0036] In one example embodiment, the modular insulator less cantilever system (10) of the present invention has a foldable structure which provides ease of transportation, for instance, from the warehouse to the installation site. Further, the modular insulator less cantilever system (10) of the invention uses no complex mechanism and comprises quick fit type components for ease of installation at the site.
[0037] Further, due to the quick fit type of detachable components, the entire system is not required to be taken down from the support structure even if a particular component of the modular insulator less cantilever system needs to be repaired or replaced.
[0038] According to an embodiment, the first arm (50) comprises the catenary clamp (60) to support the catenary cable positioned atop the first arm (50) and the second arm (70) attached to an underside of the first arm (50) and extending angularly from the first arm (50), the second arm (70) to couple to the register arm (80) and the pull off arm (90) to support the contact cable. Figure 2 further shows the second arm (70) having a groove (100) which extends along its length for slidably receiving the register arm (80) connecting the pull off arm (90) to the contact cable. Groove (100) in the second arm (70) provides a more compact design to the modular insulator less cantilever system (10) as it slidably accommodates the register arm (80) inside it without requiring additional space on the frame (20) comprising the second arm (70) for holding the register arm (80).
[0039] According to an embodiment, the length of the first arm (50) is adjustable by adjusting the position of the catenary clamp (60) along the length of the first arm (50). For the purpose, the first arm (50) comprises a plurality of grooves (not shown in the figures) extending throughout its length for slidably adjusting the position of the catenary clamp (60) on the first arm (50). The feature of adjusting the length of the first arm (50) by adjusting the position of the catenary clamp (60) along the length of the

first arm allows using the same modular insulator less cantilever system (10) for multiple applications like single track, multiple tracks, posts, over the curvatures, and most importantly for tunnels. Hence, for each application, a separate cantilever system is not required to be designed.
[0040] In an example, the catenary clamp (60) may be made of a metallic material, for example, copper.
[0041] The anti-gravity rubber arm as shown in figure 2 is positioned below the pull off arm (90) and it has dual functionality as it damps down the vibration created by the moving pantograph and keeps the pull off arm (90) in its position when in an uninstalled position.
[0042] According to an embodiment of the present invention, figure 3 illustrates a schematic view of the wall mount distal end (30) of the modular insulator less cantilever system (10). The wall mount distal end (30) facilitates to mount the insulator less cantilever system (10) on the surface. Further, figure 3 shows the means (130) for affixing the insulator less cantilever system (10) to a support structure. The means (130) for affixing can be nut-bolts, screws, lock washers etc. The means (130) for affixing allow the frame (20) of the modular insulator less cantilever system (10) to be mounted in a manner such that the frame (20) is adapted to swivel about the surface on which it is mounted. The swivelling movement of the frame (20) allows the frame (20) to adapt to the movement of the moving pantograph to which electrical power is provided via the contact cable.
[0043] As the insulator less cantilever system (10) supports the contact cable and the catenary cable in the overhead position, the frame (20) being non-metallic enables insulation. The frame (20) of the modular insulator less cantilever system (10) made of insulating non-metallic material provides for an insulator less modular insulator less cantilever system (10) for overhead electric traction system. The non-metallic frame (20) body provides a complete electrical envelope that eliminates the use of the insulators thereby enhancing the life of the cantilever system (10).

[0044] Although implementations of an insulator less modular insulator less cantilever system for supporting overhead cables is described, it is to be understood that the present subject matter is not necessarily limited to the specific features of the device described herein. Rather, the specific features are disclosed as implementations of an insulator less modular insulator less cantilever system for supporting overhead cables.

I/We Claim:
1. A modular insulator less cantilever system (10) for supporting overhead
cables, said system (10) comprising:
a frame (20) for mounting the modular insulator less cantilever system (10) on a surface, such that the frame (20) is adapted to swivel about the surface, the frame (20) comprising:
a wall mount distal end (30) to mount the frame (20) on the surface;
a proximal end (40) comprising:
a first arm (50) extending horizontally, the first arm (50) comprising a catenary clamp (60) to support a catenary cable positioned atop the first arm (50); and
a second arm (70) attached to an underside of the first arm (50) and extending angularly from the first arm (50), the second arm (70) to couple to a register arm (80) and a pull off arm (90) to support a contact cable, wherein the frame (20) is formed out of a non-metallic material.
2. The modular insulator less cantilever system (10) as claimed in claim 1, wherein the non-metallic material can be selected from a group of epoxy molds.
3. The modular insulator less cantilever system (10) as claimed in claim 1, wherein the frame (20) is made of Fibre Reinforced Plastic (FRP).
4. The modular insulator less cantilever system (10) as claimed in claim 1, wherein the frame (20) for mounting the modular cantilever system (10) on the surface is a single beam hollow structure made of insulating material.

5. The modular insulator less cantilever system (10) as claimed in claim 1, wherein the frame (20) includes a plurality of grooves (120) adapted to hold a plurality of accessories of the modular insulator less cantilever system (10) in an unassembled manner during transportation and packaging.
6. The modular insulator less cantilever system (10) as claimed in claim 1, wherein the second arm (70) comprises a groove (100) extending along its length adapted to slidably receive the register arm (80) connecting the pull off arm (90) to the contact cable.
7. The modular insulator less cantilever system (10) as claimed in claim 1, wherein the register arm (80) is made of the same non-metallic material as the frame (20).
8. The modular insulator less cantilever system (10) as claimed in claim 1, wherein the register arm (80) is made of a different non-metallic material than the frame (20).
9. The modular insulator less cantilever system (10) as claimed in claim 1, wherein the pull off arm (90) is made of a metallic material.
10. The modular insulator less cantilever system (10) as claimed in claim 1, wherein the length of the first arm (50) is adjustable by adjusting a position of the catenary clamp (60) along a length of the first arm (50), the first arm (50) comprising a plurality of grooves extending throughout its length adapted to slidably adjust the position of the catenary clamp (60) on the first arm (50), wherein the catenary clamp (60) is made of copper.