FORM2
THE PATENTS ACT, 1970
(39 of 1970)
&
The Patents Rules, 2003
COMPLETE SPECIFICATION
(See section 10; rule 13)
1. Title of the Invention. - TRANSMISSION SHAFT WITH SPLIT ROTOR TO
OPERATE ALL POLES OF SWITCH SIMULTANEOUSLY
2. Applicant(s)
(a) NAME : LARSEN & TOUBRO LIMITED
(b) NATIONALITY: An Indian Company.
(c) ADDRESS: L & T House, Ballard Estate, Mumbai 400 001,
State of Maharashtra, India
3. PREAMBLE TO THE DESCRIPTION
The following specification particularly describes the invention and the manner in which it is to be performed:

FIELD OF THE INVENTION
The present invention relates to rotor of electrical pole which is assembled and designed to reduce tool complexity. More particularly, the present invention relates to different electrical pole with different pole pitch that are positively interlocked with each other to form a transmission shaft such that all the poles will be closed and opened simultaneously.
BACKGROUND AND PRIOR ART OF THE INVENTION
The current invention is used in switches which are required to isolate load from supply.
So the load side will be completely isolated to carry out any maintenance activity. Such switches are combination of number of electrical poles driven by a mechanism.
In such switches it is necessary to make and break all the poles simultaneously to avoid any damage to the load. This becomes more critical for 4 pole devices and for neutral pole. If simultaneous make-break is achieved; then complex mechanism for early make and delayed break of neutral pole can be eliminated.
In conventional system, poles are connected together by means of single rigid rod, which increases complexity in housing cover design also it is difficult to maintain adequate creepage distance and to give positive barriers to restrict internal gases which may cause internal flashover.
In this conventional system it is difficult to assemble number of poles and carry out maintenance of specific electrical pole.

So for the ease of assembly, ease of maintenance and choice to connect number of poles; switch should be modular constructed that is number of poles connected together (side by side) to form a switch. These all poles should be positively coupled together for simultaneous making and breaking.
Also to reduce tooling cost of components it is advisable to give multiple current rating from same cassette. But different current rating requires different termination capacities (Lug/link size).
The switch should be designed to take care of different termination pitch requirement. Rotor is a component of pole which contains assembly of moving contact, cladding and leaf spring. Also one rotor has to engage with rotor from adjacent pole.
So the rotor has to have many critical features in different orientation, which increases complexity in tool design, and hence tooling cost.
Generally rotor is being designed by vertical or horizontal split. In horizontal split (split in the direction of number of pole engagement), Gap between two split parts from rotor of one pole can be exposed to gap between split parts from rotor of adjacent pole. So gases from one pole can enter into another pole, which can cause internal flashover. So to avoid it is necessary to give additional provision to stop gases e.g. gasket at split area.
Also one rotor has to engage with another rotor through engagement feature, but as rotor is made up of two split parts where split is in horizontal direction, there is gap in engagement feature.
The gap between them causes clearance and hence radial play between engagement and hence rotor to rotor motion transmission. Also to combine two

split parts they either require click-fit design (increases clearance) or additional components (increase in cost).
In vertical split (perpendicular to direction of number of pole engagement) there is no problem of internal gases but they require additional component to combine two splits which adds radial play between features of end surfaces and also which increases cost.
US2007/0063796 discloses modular switching device, the invention shows how different poles are connected together to form a switch. Transmission shaft is formed by connecting main shaft element i.e. rotor. Male feature from one rotor is engage with female feature from other rotor. Here on one end surface of rotor male feature is there and on another end surface female feature.
The rotor (main shaft element) is not made up of split parts and no any coupler is used to couple adjacent poles.
US'796 are using main shaft element (single rotor) without split to contain assembly of moving contact, cladding and leaf-spring; which increases complexity of tool design and hence tool cost. There are male features on one end surface of rotor and female feature on other end surface of same rotor. As there is no flexibility in either of the feature; while attaching one pole to another pole, the assembly clearance has to be provided between male and female feature. This will give rise to radial play between two adjecent pole during motion transmission, and hence all poles may not close simultaneously.
US5479143 discloses how different poles are connected together in multipole circuit breaker. In this invention they are using metal coupler to interlock different poles.

The use extra metal insert to connect different poles and no coupler is used is plastic component with female feature for interlocking of adjacent poles. '143 does not offer adjustable pole pitch,.
In US '143 the adjacent contact system module is coupled together through a metal coupler. Provision of metal coupler can cause a potential danger of short-circuiting if not shielded/isolated properly during assembly. Being a critical component in torque transmission; needs dimensional accuracy; achieving it in metallic component will lead to increase in manufacturing cost.
US 6084489 discloses circuit breaker rotary contact assembly locking system: This invention shows how moving contacts are made in contact with stationary contacts and how they are break from stationary contacts, and how contacts of different poles are connected together. This, invention uses Elongated pins to connect moving contact of all poles to form a drive shaft to make switch ON and OFF.
Elongated pins are used to couple different poles and coupler of plastic component is not used to couple the adjacent poles. Adjustable pole pitch is not present in US'489..
US '489 use elongated pins to connect moving contact of all poles to form a drive shaft to make switch ON and OFF. A conducting bar or pin running throughout the entire length between various poles, may cause short-circuiting which is very dangerous.
US 7221246B2 discloses a split rotor system and method with springs which shows how split rotor is assembled with each other and how moving contact arm, contact springs are assembled in split rotor and is related to circuit breaker rotor

arrangement. However, the features such as formation of rotor by vertical and horizontal split, rotor assembly is done by first vertically placing split part into each other and then horizontally sliding it for complete engagement, full proof clamping, coupler a plastic component with female feature is engaged with male feature of rotor for interlocking of adjacent pole and eliminating the use of any extra pin for moving contact, cladding and leaf spring assembly were not known in the prior art.
US6960731 discloses how different poles in circuit breaker are interlocked to form a shaft. The adjacent contact supporting shafts have been coupled with eaqh other by a separate actuating module. All the teeth are on actuating module and receptacles are on contact supporting shaft forming a Male-Female joint. The actuating module is connected to mechanism which drives contact supporting shaft to make and break switch.
Extra actuating module is used to couple two adjacent pole has all male features and no adjustable pole pitch is offered.
Actuating module is a link between mechanism and electrical pole and actuating module is having male feature and contact supporting module is having female feature, as they can't flex and fit as a interference/press fit between each other, there is assembly clearance between them which will lead to radial play during motion transmission from one pole to other, so all poles may not close simultaneously.
Thus there is a need to provide a rotor that should be designed from two identical split components which can be combined to form single rotor, which will reduce tooling complexity and hence cost.
OBJECTS OF THE INVENTION
One object of the present invention is to overcome the disadvantages / drawbacks of the prior art.

A basic object of the present invention is to provide a rotor with identical split parts adapted to simplify tool design and reduce tool cost
Another object of the present invention is to provide a rotor where no other additional component is to be used for combining two splits.
Yet another object of the present invention is to provide a split of rotor that should not cause radial play between pole engagement features of end surfaces
Yet another object of the present invention is to provide a transmission shaft by different electrical pole , where different pole pitch that are positively interlocked with each other such that all the poles will be closed and opened simultaneously.
These and advantages of the present invention will become readily apparent from the following detailed description taken in conjunction with the accompanying drawings.
SUMMARY OF THE INVENTION
According to one of the aspect of the present invention there is provided A rotor
assembly, said assembly comprising :
a rotor means having a pair of end/side surfaces, said surfaces comprising side A
and side B;
plurality of male means , said each male means substantially positioned on both
said sides surfaces of said rotor means adapted to provide with engagement
feature;
cladding means having a substantially C shaped module adapted to enhance the
electrodynamics forces generated due to specific profile & arrangement of moving
and fixed contacts;

a pair of moving contact means made of copper component which makes and
breaks with terminals to make switch ON and OFF respectively;
spring means made of steel component adapted to provide pressure to contacts;
wherein said rotor means comprises a pair of modular means , said each modular means comprises a protrusion on one end and hole on another end , said protrusion of one modular means gets engaged with hole of another modular means while guiding it horizontally to form said rotor ; wherein said pair of modular means are identical split parts.
According to another aspect of the present invention there is provided a
transmission shaft , said shaft comprising
plurality of rotor assembly, said rotor assembly comprising
a rotor means having a pair of end/side surfaces, said surfaces comprising side A
and side B;
plurality of male means , said each male means substantially positioned on both
said sides surfaces of said rotor means adapted to provide with engagement
feature;
cladding means having a substantially C shaped module adapted to enhance the
electrodynamics forces generated due to specific profile & arrangement of moving
and fixed contacts;
a pair of moving contact means made of copper component which makes and
breaks with terminals to make switch ON and OFF respectively;
spring means made of steel component adapted to provide pressure to contacts;
such that said rotor means comprises a pair of modular means , said each modular means comprises a protrusion on one end and hole on another end , said protrusion of one modular means gets engaged with hole of another modular means while guiding it horizontally to form said rotor;

such that said pair of modular means are identical split parts; plurality of coupler placed substantially on the middle of two rotor assembly, said coupler comprising a female means to get engaged with said male means of rotor; wherein said coupler is placed in between rotors such that said male means of adjacent rotors that is side A of one rotor and side B of other gets engage with female means of coupler.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWING
Other features as well as the advantages of the invention will be clear from the following description.
In the appended drawing: Figure 1 illustrates electrical pole.
Figure 2 illustrates rotor assembly.
Figure 3 illustrates rotor.
Figure 4 illustrates identical split parts combining to form rotor.
Figure 5 illustrates identical split parts combining to form rotor.
Figure 6 illustrates rotor from adjacent poles getting engaged with coupler.
Figure 7 illustrates transmission shaft formed by rotors and coupler in between.
DETAILED DESCRIPTION OF THE ACCOMPANYING DRAWING
In the following detailed description, reference is made to the accompanying drawings that form a part hereof, and illustrate the best mode presently contemplated for carrying out the invention. Further functioning of the mechanism has been discussed below to describe the way the mechanism operates. However, such description should not be considered as any limitation of scope of the present unit. The structure thus conceived is susceptible of numerous modifications and

variations, all the details may furthermore be replaced with elements having technical equivalence. in practice the materials and dimensions may be any according to the requirements, which will still be comprised within its true spirit.
Following are the components used in the present invention:-
Electrical Pole (1): Every cassette forms a single Electrical pole
Housing (2): Is a plastic component, which holds rotor assembly and terminal
Terminal (3): Is a copper component, which is connected to load and supply
Rotor assembly (4): Assembly of rotor, moving contact, cladding and leaf-spring
Rotor (5): Is a plastic component which holds pair of moving contact, magnetic cladding and leaf spring
Moving contact (6): Is a copper component which makes and breaks with terminals (Connected to supply and load) to Make switch ON and OFF respectively.
Magnetic cladding(7): Is a C shape steel component used for enhancing the electrodynamic forces generated due to specific profile & arrangement of moving and fixed contacts.
Leaf spring (8): Is a steel component which gives pressure to contacts
Side A (9): One end surface of rotor which have Male feature
Side B (10): Another end surface of rotor which have male feature
Split part 1(11): Two such parts combine to form a rotor. It has one end surface ; but when two split part combine to form a rotor, one surface becomes side A and other becomes side B.
Split part 2(12): split part 1 and 2 are same
Male Feature (13): Is a feature from rotor which engages with female feature of coupler for interlocking of poles

Female Feature (14): Is a feature from coupler which engages with male feature of rotor for interlocking
Coupler (15): Is a plastic component having female feature which engages with adjacent pole
Following are the terminologies used in the present invention:-
Switch: Is a assembly of mechanism and contact system which isolates load from supply.
Cassette: Assembly of two identical housing which holds rotor assembly, terminal from supply and load side
Mechanism: This operates rotor assembly to make switch ON/OFF
Termination pitch: Distance between termination holes of adjacent pole
Pole pith: Distance between contact surfaces of adjacent pole
End Surface: Is a surface of a rotor; which have male feature to engage with other component
Description:
Switch is combination of mechanism and number of poles as shown in Figure.1 connected side by side. Every electrical pole consists of terminals and rotor assembly. Rotor assembly is assembly of rotor, moving contact, cladding and leaf-spring as shown in figure2. Rotor as shown in figure 3 is assembly of two identical split parts. As shown in figure 4, split parts are firstly vertically placed inside each other and then horizontally guided to get engage in each other to form a rotor. One end of split part has protrusion (17) and other end has hole (16), so after guiding horizontally both the splits get completely engage with each other. So unlike others, this rotor has both horizontal and vertical split.

This particular assembly does not require any additional component. As End surfaces of rotor, which contains engagement features are not split; the gap between split is not exposed to adjacent pole; eliminating chances of internal flashover and use of additional component to avoid that. As both the split parts get clamped in each other and engaged by hole and protrusion arrangement; leaf spring force in horizontal direction and moving contact impact in vertical direction does not cause rotor to get disassemble.
As shown in figure 3, end surfaces (9 and 10) have male feature (13). The coupler (15) is a plastic component which has female feature. So during formation of transmission shaft; coupler is placed in between rotors as shown in figure.6. So that male feature (13) of adjacent rotors that is side A of one rotor and side B of other gets engage with female feature (14) of coupler (15). And as coupler has a female feature, and as it can flex and can be used as interference/press fit for male and female feature engagement; which ensures zero clearance between engagements of two adjacent rotors. This guarantees zero radial play between adjacent poles during motion transmission. The complete transmission shaft assembly is as shown in figure7.
Coupler (15) has female feature and is a plastic component; it can flex and can fit as interference/press fit in male features of rotor, which ensures zero clearance and hence zero radial play in motion transmission between adjacent poles.
When same switch is to be used for application where different termination pitch is needed to terminate different sizes of cables/links, then coupler of different size is placed to adjust pole pitch in between the two poles which is having female features to get engage with male feature of Side A and Side B of rotor. This forms a transmission shaft having higher termination pitch..

Features:
• Modular construction switch
• Rotor with identical split parts to simplify tool design and reduce tool cost
• No any additional component to be used for combining two splits; even after that leaf spring force in horizontal direction and moving contact impact in vertical direction do not cause rotor to get disassemble.
• Split of rotor should not cause radial play between pole engagement features of end surfaces
• Split direction and location should not cause internal flashover
• Use of additional component to ensure zero radial play between two adjacent pole
• Provision to give adjustable termination pitch
• No metal component for coupling between adjacent pole
• Keeping same termination pitch in R,Y and B pole; more termination pole pitch can be offered for neutral pole and hence manufacturer can offer more than 100% neutral rating which require lug/link with higher size.

WE CLAIM:
1. A rotor assembly , said assembly comprising :
a rotor means having a pair of end/side surfaces, said surfaces comprising
side A and side B;
plurality of male means , said each male means substantially positioned on
both said sides surfaces of said rotor means adapted to provide with
engagement feature;
cladding means having a substantially C shaped module adapted to
enhance the electrodynamics forces generated due to specific profile &
arrangement of moving and fixed contacts ;
a pair of moving contact means made of copper component which makes
and breaks with terminals to make switch ON and OFF respectively;
spring means made of steel component adapted to provide pressure to
contacts;
wherein said rotor means comprises a pair of modular means , said each modular means comprises a protrusion on one end and hole on another end said protrusion of one modular means gets engaged with hole of another modular means while guiding it horizontally to form said rotor; wherein said pair of modular means are identical split parts.
2. Assembly as claimed in claim 1 wherein said pair of modular means are vertically placed inside each other and then horizontally guided adapted to get engaged in each other to form a rotor.
3. Assembly as claimed in claim 1 wherein said modular means having vertical and horizontal split parts.
4. A transmission shaft, said shaft comprising
(a) plurality of rotor assembly, said rotor assembly comprising

a rotor means having a pair of end/side surfaces, said surfaces
comprising side A and side B;
plurality of male means , said each male means substantially
positioned on both said sides surfaces of said rotor means adapted to
provide with engagement feature;
cladding means having a substantially C shaped module adapted to
enhance the electrodynamics forces generated due to specific profile &
arrangement of moving and fixed contacts ;
a pair of moving contact means made of copper component which
makes and breaks with terminals to make switch ON and OFF
respectively;
spring means made of steel component adapted to provide pressure to
contacts;
such that said rotor means comprises a pair of modular means , said each modular means comprises a protrusion on one end and hole on another end , said protrusion of one modular means gets engaged with hole of another modular means while guiding it horizontally to form said rotor;
such that said pair of modular means are identical split parts; (b) plurality of coupler placed substantially on the middle of two rotor assembly , said coupler comprising a female means to get engaged with said male means of rotor;
wherein said coupler is placed in between rotors such that said male means of adjacent rotors that is side A of one rotor and side B of other gets engage with female means of coupler .
5. Transmission shaft as claimed in claim 1 wherein said coupler means is a plastic component.

6. Transmission shaft as claimed in claim 1 wherein said coupler means is flexed and is press fitted for male means and female means engagement to ensure zero clearance.