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 current collector pad and terminal box using said current collector pads.
APPLICANTS (S)
Crompton Greaves Limited, CG House, Dr Annie Besant Road, Worli, Mumbai 400 030, Maharashtra, India, an Indian Company
INVENTOR (S)
Wadbude Sahebrao of Crompton Greaves Limited, Machine (M7) Division, D-5, Industrial Area, MPAKVN, Mandideep - 462046, Madhya Pradesh, 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 the field of motors.
Particularly, this invention relates to terminal boxes for motors.
Still particularly, this invention relates to a current collector pad and terminal box using said current collector pads.
BACKGROUND OF THE INVENTION:
An electric motor is an electro-mechanical assembly that converts electrical energy into the mechanical energy. Most electric motors operate through the interaction of magnetic fields and current-carrying conductors to generate torque.
A variety of motors are available in the market. These include High Tension motors, Low Tension motors, and the like. The voltage / current demands and supply of the motor vary, too.
A motor, typically, has a driving side and a non driving side. Exact location of the supply terminal box may be RHS/LHS looking from Driving End (DE) face of the Motor.
A terminal box is an enclosure which includes, mounts, and protects one or more terminals or terminal boards. The main terminal box and star terminal box has three phase supply.

There is a termination arrangement for main supply cables to the motors through insulators.
According to the prior art, for motor power supply, insulators (studs) of brass material and cable lugs of aluminum were used. But, these have problems which relate to current density. This insulator arrangement, of the prior art, had relatively less contact surface between the terminal socket and insulator which is a cause of improper current transfer during motor start and motor operation. This affects current density. At the time of current distribution, in the motor and terminal box system, the terminal junction used to get heated, recording high temperatures, which resulted in sparking and blasts, too.
Hence, there is a need for an arrangement which allows for appropriate current transfer.
OBJECTS OF THE INVENTION:
An object of the invention is to allow appropriate current transfer at termination arrangement for main supply cables to the motors.
Another object of the invention is to eliminate high current, sparking, and blast at termination arrangement for main supply cables to the motors.
Yet another object of the invention is to provide increased contact surface or contact area at termination arrangement for main supply cables to the motors.

Still another object of the invention Is to reduce heat generation transfer at termination arrangement for main supply cables to the motors.
SUMMARY OF THE INVENTION:
According to this invention, there is provided a current collector pad adapted to be fitted between insulator bushing and supply cable for an electrical assembly, said pad being a substantially disc shaped member having a first disc, a co-axial polygonal disc atop said first disc, and a second co-axial disc stop said polygonal disc, each of said discs having progressively reducing radii, thereby forming a stepped assembly.
According to this invention, there is also provided a terminal box comprising a plurality of supply cables and a plurality of corresponding insulator bushings, said terminal box comprising a current collector pad adapted to be fitted between each pair of said insulator bushing and said supply cable, said pad being a substantially disc shaped member having a first disc, a co-axial polygonal disc atop said first disc, and a second co-axial disc stop said polygonal disc, each of said discs having progressively reducing radii, thereby forming a stepped assembly.
Typically, said pad includes a through hole adapted to be coaxial through this three-disc assembly.
Typically, said first disc forms the mating surface with insulator bushings.
Typically, said polygonal disc forms the gripping surfaces for a spanner used to tighten said current collector pad in its operating location.

Typically, said second disc forms the mating surface with supply cables. BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS:
Figure 1 illustrates a front view of the terminal box of the prior art;
Figure 2 illustrates a close-up of the front view of the terminal box of the prior art;
Figure 3 illustrates a side view of the terrninal box of the prior art; and
Figure 4 illustrates an isometric view of the terminal box of the prior art.
The invention will now be described in delation to the accompanying drawings, in which:
Figure 5 illustrates an isometric view of a. current collector pad;
Figure 6 illustrates a front view of the current collector pad of Figure 1;
Figure 7 illustrates a side view of the current collector pad of Figure 1;
Figure 8 illustrates a side view of the terminal box fitted with the current collector pad of Figure 1;
Figure 9 illustrates a dose-up front isometric view of the terminal box fitted with the current collector pad of Figure 1;

Figure 10 illustrates a close-up front isometric view of the terminal box fitted with the current collector pad of Figure 1;
Figure 11 illustrates a close-up back isometric view of the terminal box fitted with the current collector pad of Figure 1;
Figure 12 illustrates a side view of the terminal box fitted with the current collector pad of Figure 1; and
Figure 13 illustrates a back isometric view of the terminal box fitted with the current collector pad of Figure 1.
DETAILED DESCRIPTION OF THE ACCOMPANYING DRAWINGS:
Figure 1 illustrates a front view of the terminal box of the prior art. Figure 2 illustrates a close-up of the front view of the terminal box of the prior art. Figure 3 illustrates a side view of the terminal box of the prior art. Figure 4 illustrates an isometric view of the terminal box of the prior art.
The terminal box includes three phase supply cables as reference by numerals 12a, 12b, 12c. According to the prior art, an insulator bushing (14) is connected directly to each of the supply cables.
These have problems which relate to current density. Standard terminal bushings in all the HT motors, have very less contacts due to manufacturing difficulties.

This insulator arrangement, of the prior art, had relatively less contact surface between the terminal socket and insulator which is a cause of improper current transfer during motor start and motor operation. This affects current density. At the time of current distribution, in the motor and terminal box system, the terminal junction used to get heated, recording high temperatures, which resulted in sparking and blasts, too.
According to this invention, there is provided a current collector pad adapted to be fitted between insulator bushing and supply cable for an electrical assembly.
Figure 5 illustrates an isometric view of a current collector pad. Figure 6 illustrates a front view of the current collector pad of Figure 1. Figure 7 illustrates a side view of the current collector pad of Figure 1.
In accordance with an embodiment of this invention, the current collector pad (200) is a substantially disc shaped member having a first disc (52), a co-axial polygonal disc (54) atop the first disc (52), and a second co-axial disc (56) stop the polygonal disc (54). Each of the discs (52, 54, 56) have progressively reducing radii, thereby forming a stepped assembly. A tapped through hole (58) is provided which is coaxial through this three-disc assembly which forms the current collector pad.
The first disc (56) forms the mating surface with the insulator bushings (14).
The polygonal disc (54) provides the gripping surfaces for a spanner used to tighten the current collector pad in its operating location.

The second disc (52) provides the mating surface with the supply cables lugs (12a, 12b, 12c).
Figure 8 illustrates a side view of the terminal box fitted with the current collector pad of Figure 1. Figure 9 illustrates a close-up front isometric view of the terminal box fitted with the current collector pad of Figure 1. Figure 10 illustrates a close-up back isometric view of the terminal box fitted with the current collector pad of Figure 1. Figure 11 illustrates a close-up back isometric view of the terminal box fitted with the current collector pad of Figure 1. Figure 12 illustrates a side view of the terminal box fitted with the current collector pad of Figure 1. Figure 13 illustrates a back isometric view of the terminal box fitted with the current collector pad of Figure 1.
The terminal box (300), according to this invention, incorporates three current collector pads (200). Each current collector pad (200) is fitted between a pair of a phase of supply cable (12a, 12b, 12c) and corresponding insulator bushing (14).]
The incorporation of the current collector pad (200) results in increase of contact surface between two contacts like Insulator bushing and customer supply cable sockets (supply cables) using additional method of termination bushing. When proper surface contact area increases, in standard terminal bushing, then heat generation and blasting reduces.
The Inventive Step of the proposed invention lies in provisioning of a substantially disc shaped current collector pad with various stepped levels for aiding better conduction between two contacts.

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 current collector pad adapted to be fitted between insulator bushing and supply cable for an electrical assembly, said pad being a substantially disc shaped member having a first disc, a co-axial polygonal disc atop said first disc, and a second co-axial disc stop said polygonal disc, each of said discs having progressively reducing radii, thereby forming a stepped assembly.
2. A current collector pad as claimed in claim 1 wherein, said pad includes a through tapped hole adapted to be coaxial through this three-disc assembly.
3. A current collector pad as claimed in claim 1 wherein, said first disc forms the mating surface with insulator bushings.
4. A current collector pad as claimed in claim 1 wherein, said polygonal disc forms the gripping surfaces for a spanner used to tighten said current collector pad in its operating location.
5. A current collector pad as claimed in claim 1 wherein, said second disc forms the mating surface with supply cables.
6. A terminal box comprising a plurality of supply cables and a plurality of corresponding insulator bushings, said terminal box comprising a current collector pad adapted to be fitted between each pair of said insulator bushing and said supply cable, said pad being a substantially disc shaped member having a first disc, a co-axial polygonal disc atop said first disc, and a

second co-axial disc stop said polygonal disc, each of said discs having progressively reducing radii, thereby forming a stepped assembly.
7. A terminal box as claimed in claim 6 wherein, said pad includes a through tapped hole adapted to be coaxial through this three-disc assembly.
8. A terminal box as claimed in claim 6 wherein, said first disc forms the mating surface with insulator bushings.
9. A terminal box as claimed in claim 6 wherein, said polygonal disc forms the gripping surfaces for a spanner used to tighten said current collector pad in its operating location.
10.A current collector pad as claimed in claim 6 wherein, said second disc forms the mating surface with supply cables.