FORM 2
THE PATENTS ACT, 1970
(39 of 1970)
As amended by the Patents (Amendment) Act, 2005
AND
The Patents Rules, 2003
As amended by the Patents (Amendment) Rules, 2005
COMPLETE SPECIFICATION
(See section 10 and rule 13)
TITLE OF THE INVENTION
A jig for assembling moving contact assembly for interrupters.
APPLICANTS :
Crompton Greaves Limited, CG House, Dr Annie Besant Road, Worli, Mumbai 400 030, Maharashtra, India, an Indian Company
INVENTOR (S):
Kulthe Sunil of Crompton Greaves Ltd, Switchgear (S3) Division, Switchgear Complex, A-3, MIDC, Ambad, Nashik - 422010, Maharashtra, India; an Indian National.
PREAMBLE TO THE DESCRIPTION:
The following specification particularly describes the nature of this invention and the manner in which it is to be performed:

FIELD OF THE INVENTION:
This invention relates to mechanical engineering, mechanical assemblies, and mechanical fixtures.
Particularly, this invention relates to interrupters and assemblies for assembling moving contact assembly for interrupters.
Specifically, this invention relates to a jig for assembling moving contact assembly for interrupters.
BACKGROUND OF THE INVENTION:
The term switchgear, used in association with the electric power system, or substation or power grid, or power distribution systems, refers to the combination of electrical disconnects, fuses and/or circuit breakers used to isolate electrical equipment. Switchgear is used both to de-energize equipment to allow work to be done and to clear faults downstream. Switchgear are also typically employed to protect the associated system against abnormal conditions, such as power line fault conditions or irregular loading conditions or transients. This type of equipment is important because it is directly linked to the reliability of the electricity supply and the electrical load.
Different types of switchgear exist for different applications. A fault interrupter is one type of switchgear. Fault interrupters are employed to automatically open a power line upon the detection of a fault condition.
Interrupters are a type of switchgear equipment which finds its use in power network operators and power switching technology. Interrupters include a set of

contacts (fixed as well as movable) which connect or disconnect in accordance with the working parameters to enable or disable switching, accordingly.
An interrupter assembly of 420 kv spring gas circuit breaker consists of pole assembly and housing. Pole assembly break one and break two are connected with one common tank. In pole assembly, interrupter consists of moving contact assembly, mechanical assembly, and lower terminal assembly. Each of the sub- assembly components have specific torque requirement to avoid any loosening during high load operations. For applying torque, it is necessary to hold mating parts into any fixed base or one component should fixed/hold.
According to the prior art, assembly and application of torque (min 2200 kg-cm ) was performed by holding one component into bench voice and mating component tightened by hand, but bench voice has jaws that has knurling for grip purpose. Due to that, aluminum and copper material contacts were damaged on surface. Sometimes, knurling created impressions and major burr occurred on surface which is not allowed for short circuit testing of breaker which may result in tendency to flashover inside of interrupter. Because of metallic burr, breakers used to fail in short circuit test. Rough surface of arc contacts were also very problematic in circuit breaker performance. It may result in major hazards if circuit breaker fails to operate. Secondly, if bench voice jaws were over tightened than required, it may tend to bend concentric components. Hence, its concentricity deviated drastically and direct effect on capacitive current short circuit test of breaker was observed.
Hence, there is a need for a jig for assembling moving contact assembly for interrupters.

OBJECTS OF THE INVENTION:
An object of the invention is to provide a jig for assembling moving contact assembly for interrupters.
Another object of the invention is to provide a jig for assembling moving contact assembly for interrupters such that there is no contact surface damage to the moving contact assembly.
Yet another object of the invention is to provide a jig for assembling moving contact assembly for interrupters such that a burr free moving contact assembly is obtained.
Still another object of the invention is to provide a jig for assembling moving contact assembly for interrupters such that concentricity of mating the components of the moving contact assembly is maintained.
An additional object of the invention is to provide a jig for assembling moving contact assembly for interrupters such that torque for assembling the components of the moving contact assembly can be smoothly applied.
Yet an additional object of the invention is to provide a jig for assembling moving contact assembly for interrupters such that there is reduction of manual labour.
Still an additional object of the invention is to provide a jig for assembling moving contact assembly for interrupters such that safety level of operator assembling the moving contact assembly is improved.

Another additional object of the invention is to provide a jig for dis-assembling moving contact assembly for interrupters.
SUMMARY OF THE INVENTION:
According to this invention, there is provided a jig for assembling moving contact assembly, which moving contact assembly being comprised of at least an adapter component, at least a moving arc contact component, at least a piston rod component, at least a rod end component, at least an auxiliary nozzle component, said jig comprises:
a. first bracket comprising an elongate bar with longitudinally laterally located
side arms, said side arms being an operative right hand side arm and an
operative left hand side arm, each of said arms adapted to provide support to
said piston rod component at its relative end portions such that its ends jut out
beyond each of said side arms; and
b. second bracket adapted to be located over the operative left hand side arm of
said jig for securing positioned piston rod component.
Typically, said arms are orthogonal arms adapted to extend orthogonally from the ends of said elongate bar.
Typically, said operative right hand side arm comprises a hollow portion which is a substantially circular hollow portion to allow a piston rod component to pass therethrough.
Typically, said operative right hand side arm comprises a plurality of locating studs extending out of the operative external side of said operative right hand side arm.

Typically, said operative right hand side arm comprises a hollow portion which is a substantially circular hollow portion to allow a piston rod component to pass therethrough, and further comprising a plurality of locating studs extending out of the operative external side of said operative right hand side arm, characterised in that, said locating studs being circumferentially disposed about said hollow portion.
Typically, said operative right hand side arm comprises a plurality of locating studs extending out of the operative external side of said operative right hand side arm, said locating studs adapted to receive said adaptor component such that said piston rod component and said adaptor component can concentrically mate at the end that juts out of said operative right hand side arm of aid jig.
Typically, said operative right hand side arm comprises a plurality of locating studs extending out of the operative external side of said operative right hand side arm, said locating studs adapted to receive said adaptor component such that said piston rod component and said adaptor component can concentrically mate at the end that juts out of said operative right hand side arm of aid jig and said moving arc contact component can be fastened on to the adaptor component.
Typically, said operative right hand side arm comprises a plurality of locating studs extending out of the operative external side of said operative right hand side arm, said locating studs adapted to receive said adaptor component such that said piston rod component and said adaptor component can concentrically mate at the end that juts out of said operative right hand side arm of aid jig, said moving arc contact component can be fastened on to the adaptor component, and said auxiliary nozzle component can be fastened on to the fastened moving arc contact component.

Typically, said operative left hand side arm is half the length of said operative right hand side arm.
Typically, said operative left hand side arm ends in a semi-circular indentation whose centre is co-axial to the centre of a hollow portion of said operative right hand side arm.
Typically, said operative left hand side arm ends in a semi-circular indentation whose centre is co-axial to the centre of a hollow portion of said operative right hand side arm, with a second end of said piston rod component resting on said semi-circular indentation and said piston rod component is fully supported, in a substantially horizontal manner, on said jig.
Typically, said second bracket comprises a semi-circular hollow indentation adapted to be similar and matching in dimensions and radius to a semi-circular hollow indentation of said operative left hand side arm., such that when it is inverted and fitted on to said operative left hand side arm, it forms a fixture similar to the operative right hand side arm with a complete hollow portion.
Typically, said jig comprises fastening elements adapted to fasten said second bracket on to said operative left hand side arm once the piston rod component is located.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS:
Figure 1 illustrates an isometric view of an interrupter;
Figure 2 illustrates an adapter component of moving contact assembly of

interrupter;
Figure 3 illustrates a moving arc contact component of moving contact assembly of interrupter;
Figure 4 illustrates a piston rod component of moving contact assembly of interrupter;
Figure 5 illustrates a rod end component of moving contact assembly of interrupter;
Figure 6 illustrates an auxiliary nozzle component of moving contact assembly of interrupter; and
Figure 7 illustrates an assembled moving contact assembly.
The invention will now be described in relation to the accompanying drawings, in which:
Figure 8 illustrates a jig for assembling moving contact assembly for interrupters;
Figure 9 illustrates a first component of a jig of Figure 8 for assembling moving contact assembly for interrupters;
Figure 10 illustrates a second component of a jig of Figure 8 for assembling moving contact assembly for interrupters;

Figure 11 illustrates a preliminary step of assembling moving contact assembly for interrupters using the jig of Figure 8; and
Figure 12 illustrates a final step of assembling moving contact assembly for interrupters using the jig of Figure 8.
DETAILED DESCRIPTION OF THE ACCOMPANYING DRAWINGS:
Figure 1 illustrates an isometric view of an interrupter (100).
Figure 2 illustrates an adapter component (11) of moving contact assembly of interrupter.
Figure 3 illustrates moving arc contact component (13) of moving contact assembly of interrupter.
Figure 4 illustrates piston rod component (15) of moving contact assembly of interrupter.
Figure 5 illustrates rod end component (17) of moving contact assembly of interrupter.
Figure 6 illustrates auxiliary nozzle component (19) of moving contact assembly of interrupter.
Figure 7 illustrates an assembled moving contact assembly (25).
According to this invention, there is provided a jig for assembling moving contact

assembly for interrupters.
Figure 8 illustrates a jig (200) for assembling moving contact assembly for interrupters.
Figure 9 illustrates a first component (200a) of a jig (200) of Figure 8 for assembling moving contact assembly for interrupters.
Figure 10 illustrates a second component (200b) of a jig (200) of Figure 8 for assembling moving contact assembly for interrupters.
Figure 11 illustrates a preliminary step of assembling moving contact assembly (with some of its parts 11, 15, and 17) for interrupters using the jig of Figure 8.
Figure 12 illustrates a final step of assembling moving contact assembly (with all of its parts 11, 13, 15, 17, and 19) for interrupters using the jig of Figure 8.
In accordance with an embodiment of this invention, there is provided a first bracket (200a) comprising an elongate bar (2) with longitudinally laterally located side arms. The side arms are an operative right hand side arm (3) and an operative left hand side arm (1). These arms extend orthogonally from the ends of the elongate bar.
Typically, the operative right hand side arm (3) comprises a hollow portion (3a) which is a substantially circular hollow portion to allow a piston rod component (15) to pass there-through. A first end of the piston rod component juts out of the hollow portion of the jig. And the piston rod component rests, at one end, on the

inner circumference of the hollow portion of the jig. Further, the operative external side of the operative right hand side arm comprises a plurality of locating studs (3b) extending out. These locating studs are circumferentially disposed about the hollow portion. These locating studs are, preferably, four in number. The locating studs receive the adaptor component (11) such that the piston rod component and adaptor component can concentrically mate at the end that juts out of the operative right hand side arm of the jig. Once the adaptor component is located, it can be fastened on to the piston rod component. Also, at the distal end of the adaptor component, the further components of the moving contact assembly (25) i.e. the moving arc contact component (13) can be fastened on to the adaptor component, and the auxiliary nozzle component (19) can be fastened on to the fastened moving arc contact component.
Typically, the operative left hand side arm (1) is half the length of the operative right hand side arm. This operative left hand side arm ends in a semi-circular indentation (la) whose centre is co-axial to the centre of the hollow portion of the operative right hand side arm. The co-axial matching is in line with and is parallel to the longitudinal axis of the elongate bar. A second end of the piston rod component rests on this semi-circular indentation and the piston rod component is fully supported, in a substantially horizontal manner, on the jig of this invention.
In accordance with another embodiment of this invention, there is provided a second bracket (200b) adapted to be located over the operative left hand side arm of the jig. This second bracket also includes a semi-circular hollow indentation (4a) which is similar in dimensions and radius to the semi-circular hollow indentation (la).of the operative left hand side arm. This second bracket is, typically, complementary to the operative left hand side arm (1) and equivalent in length,

shape, and dimensions to the operative left hand side arm such that when it is inverted and fitted on to the operative left hand side arm, it forms a fixture similar to the operative right hand side arm with a complete hollow portion.
Typically, there are fastening elements (4a) to fasten the second bracket on to the operative left hand side arm once the piston rod component is located.
The second end of the piston rod component rests partially and juts out of the operative left hand side arm. A rod end component is adapted to be concentrically mated at the jutting out second end of the piston rod component to complete the assembling of the moving contact assembly.
With the use of this jig, concentricity is achieved of the mating components (11, 13, 15, 17, and 19) which form the moving contact assembly (25). Contact surface damage during mating is avoided and a burr-free moving contact assembly can be achieved. Concentricity of mating components is achieved without much effort.
Further, application of torque in order to secure fastening of mating components, using this fixture, is relatively simple and reduces additional manual labour that was earlier required to hold the components together. Due to fixture slipping of torque wrench has been avoided, thereby improving operator safety level..
Still further, accuracy of assembly is improved greatly and it reflects an increase in reliability of circuit breaker performance which uses this moving contact assembly.
Additionally, is relatively an easier process to also dismantle the moving contact assembly using the jig of this invention, very easily.

The technical advancement of this invention lies in provisioning a jig adapted to located various components that form a moving contact assembly for use in switchgear equipment, which jig facilitates concentric locating, mating, and fastening of the various components in relatively easy and accurate manner. Due to the use of this jig, a burr-free moving contact assembly with elimination of contact surface damage is achieved.
While this detailed description has disclosed certain specific embodiments of the present invention for illustrative purposes, various modifications will be apparent to those skilled in the art which do not constitute departures from the spirit and scope of the invention as defined in the following claims, and it is to be distinctly understood that the foregoing descriptive matter is to be interpreted merely as illustrative of the invention and not as a limitation.

We claim,
1. A jig for assembling moving contact assembly, which moving contact assembly being comprised of at least an adapter component, at least a moving arc contact component, at least a piston rod component, at least a rod end component, at least an auxiliary nozzle component, said jig comprising:
a. first bracket comprising an elongate bar with longitudinally laterally
located side arms, said side arms being an operative right hand side
arm and an operative left hand side arm, each of said arms adapted to
provide support to said piston rod component at its relative end portions
such that its ends jut out beyond each of said side arms; and
b. second bracket adapted to be located over the operative left hand side
arm of said jig for securing positioned piston rod component.
2. A jig as claimed in claim 1, wherein said arms are orthogonal arms adapted to extend orthogonally from the ends of said elongate bar.
3. A jig as claimed in claim 1, wherein said operative right hand side arm comprising a hollow portion which is a substantially circular hollow portion to allow a piston rod component to pass there-through.
4. A jig as claimed in claim 1, wherein said operative right hand side arm comprising a plurality of locating studs extending out of the operative external side of said operative right hand side arm.

5. A jig as claimed in claim 1, wherein said operative right hand side arm comprising a hollow portion which is a substantially circular hollow portion to allow a piston rod component to pass there-through, and further comprising a plurality of locating studs extending out of the operative external side of said operative right hand side arm, characterised in that, said locating studs being circumferentially disposed about said hollow portion.
6. A jig as claimed in claim 1, wherein said operative right hand side arm comprising a plurality of locating studs extending out of the operative external side of said operative right hand side arm, said locating studs adapted to receive said adaptor component such that said piston rod component and said adaptor component can concentrically mate at the end that juts out of said operative right hand side arm of aid jig.
7. A jig as claimed in claim 1, wherein said operative right hand side arm comprising a plurality of locating studs extending out of the operative external side of said operative right hand side arm, said locating studs adapted to receive said adaptor component such that said piston rod component and said adaptor component can concentrically mate at the end that juts out of said operative right hand side arm of aid jig and said moving arc contact component can be fastened on to the adaptor component.
8. A jig as claimed in claim 1, wherein said operative right hand side arm comprising a plurality of locating studs extending out of the operative external side of said operative right hand side arm, said locating studs adapted to receive said adaptor component such that said piston rod component and said adaptor component can concentrically mate at the end

that juts out of said operative right hand side arm of aid jig, said moving arc contact component can be fastened on to the adaptor component, and said auxiliary nozzle component can be fastened on to the fastened moving arc contact component.
9. A jig as claimed in claim 1, wherein said operative left hand side arm is half the length of said operative right hand side arm.
10. A jig as claimed in claim 1, wherein said operative left hand side arm ends in a semi-circular indentation whose centre is co-axial to the centre of a hollow portion of said operative right hand side arm.
11. A jig as claimed in claim 1, wherein said operative left hand side arm ends in a semi-circular indentation whose centre is co-axial to the centre of a hollow portion of said operative right hand side arm, with a second end of said piston rod component resting on said semi-circular indentation and said piston rod component is fully supported, in a substantially horizontal manner, on said jig.
12. A jig as claimed in claim 1, wherein said second bracket comprising a semicircular hollow indentation adapted to be similar and matching in dimensions and radius to a semi-circular hollow indentation of said operative left hand side arm., such that when it is inverted and fitted on to said operative left hand side arm, it forms a fixture similar to the operative right hand side arm with a complete hollow portion.

13. A jig as claimed in claim 1, wherein said jig comprising fastening elements adapted to fasten said second bracket on to said operative left hand side arm once the piston rod component is located.