FORM 2
THE PATENTS ACT, 1970
(39 OF 1970)
As amended by the Patents (Amendment) Act, 2005
&
The Patents Rules, 2003
As amended by the Patents (Amendment) Rules, 2006
COMPLETE SPECIFICATION
(See section 10 and rule 13)
TITLE OF THE INVENTION
TERMINAL STUD FOR AN ELECTRIC MOTOR
APPLICANTS
Name : Crompton Greaves Limited
Address : CG House, Dr Annie Besant Road, Worli, Mumbai 400 025, Maharashtra,
INDIA
Nationality : an Indian Company
INVENTOR
Name : Dhokane Prakash
Address :Crompton Greaves Ltd, Technology Department, LT Motors (M3), A6/2
M IDC Area, Ahmednagar 414 111, Maharashtra, India Nationality : Indian
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 invention:
This invention relates to a terminal stud for use in electric motors.
Background of the invention:
Various types of motors are known and used in industries. Motors are usually provided with connecting devices known as terminal studs. The terminal studs are usually external to the motor and are provided in the terminal box of the motor. Lead wires attached to the terminal studs are used for connecting external sensing devices such as resistance temperature detectors (RTD), space heaters, thermistors or the like to the stator winding of the motor. Devices such as those mentioned above are used for checking and monitoring the temperature of the components of the motor. In the event of overheating, these devices will indicate the rise in temperature. This helps to prevent damage to the motor.
Prior Art:
Conventionally, a plurality of terminal studs each having one terminal is used to connect the aforementioned devices to the motor. Devices such as an RTD may be used in configurations such as 2-wire, 3-wire and 4-wire. Thus for connecting a 4-wire RTD at least four connecting devices are required. For connecting other devices additional terminal studs would be necessary. This increases the number of terminal studs required to connect a number of devices which in turn increase the space required to accommodate individual terminal studs. The use of more
number of terminal studs makes the motor heavier and expensive. The presence of a larger number of terminal studs increases the number of connections and maintenance becomes difficult.
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This invention seeks to overcome the limitations of the prior art.
An object of this invention is to provide a simple and inexpensive terminal stud having plurality of terminals.
Another object of this invention is to provide a compact terminal stud which reduces the space required to accommodate the terminal stud in the terminal box of an electric motor.
Another object of this invention is to provide a terminal stud which reduces the material cost for its construction.
Another object of this invention is to provide a terminal stud which reduces the time required for mounting the terminal stud in the terminal box of an electric motor.
Another object of this invention is to provide a terminal stud which reduces the time required for connecting the sensing devices to the terminal stud.
Summary of the invention:
In accordance with this invention there is provided a terminal stud for use in an electric motor, said terminal stud comprising an oblong body made of electric insulating material and adapted to be fitted in a terminal box of the electric motor and a plurality of terminals located in said oblong
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body electrically isolated from one another and extending from either side of said oblong body in a staggered manner.
Typically, the oblong body is provided with a flange at one end of said oblong body and a nut at the other end of said oblong body in thread engagement therewith, said terminal stud being mounted on the bottom plate of the terminal box by locating the terminal stud in an opening provided in the bottom plate with the flange abutting one surface of the bottom plate and tightening the nut against the opposite surface of the bottom plate.
Typically, the oblong body comprises a metallic sleeve fitted over said oblong body, said nut being in threading engagement with said sleeve.
Brief description of the accompanying drawings:
An embodiment of this invention is represented in the accompanying drawings. However the represented embodiment is only illustrative and does not limit the scope of the invention.
In the drawings:
Figure 1a illustrates one side isometric view of the terminal stud in accordance with this invention;
Figure lb illustrates the other or opposite side isometric view of the terminal stud in accordance with this invention;
Figure 1c illustrates the plan view of the terminal stud in accordance with this invention;
Figure 2 illustrates a sectional view of the terminal stud;

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Figure 3 illustrates a sectional view of the body of the terminal stud with the terminals fitted m
the body; and
Figure 4 illustrates a sectional view of a junction box comprising the terminal stud fitted therein.
Detailed description of the accompanying drawings:
The invention will now be described in detail with reference of the figure 1 to 4 of the accompanying drawings.
In figures la, lb and 1c, the terminal stud (10) defines an oblong body (12) which is made of electric insulating material. A plurality of terminals (14) are located in the body (12) electrically isolated from one another and extend from either end of the body (12). The terminals extend from the body (12) in a staggered manner which facilitates easier connection of the lead wires extending from the stator of the motor. A flange (16) is provided at one end of the body (12) integrally therewith.
Figure 2 illustrates a sectional view of the terminal stud. A metallic sleeve (18) is fitted on the body (12) and abuts the flange (16). A collar (32) is provided on the outer surface of the oblong body (12) as particularly seen in figure 3, which engages in a corresponding groove (not marked but can be seen in figure 2) in the sleeve so as to hold the metallic sleeve (18) in position on the
oblong body. The metallic sleeve (18) is threaded at the outer end and a nut (20) is provided at the outer end of the sleeve in thread engagement therewith. As the sleeve (18) is metallic it provides better grip for the nut and protects the body (12) from damage due to the gripping force
when the terminal stud (10) is fitted in the terminal/junction box of the motor.
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The terminal stud (10) is mounted on the base plate (24) of the terminal box (26) of the motor by locating the terminal stud in an opening (not shown in figure but can be visualized in figure 4) provided in the bottom plate (24). While mounting the terminal stud (10) of the base plate (24), the flange (16) abuts one surface of the bottom plate and the nut (20) is tightened against the opposite surface of the base plate (24). The lead wires extending from the stator are first attached to the terminals (14) of the terminal stud (10), the terminal stud is then fitted to the base plate (24). The terminals above the base plate (24) can then be easily connected to the terminals of the sensing devices such as resistance temperature detectors (RTD's), thermistors, space heaters or the like. A cover (30) is then placed over the terminal box (26)
In accordance with the invention a single terminal stud comprising a plurality if terminals which can be used to connect a number of sensing devices. The provision of a plurality of terminals makes the terminal stud compact thus reducing the space required to accommodate the terminal stud in the terminal box of an electric motor, cost of the terminal stud is also reduced. The time required for mounting the terminal stud in the terminal box and time required to connect the terminal stud to the sensing devices are also reduced as compared to mounting several studs each with a single terminal.
Even though emphasis is laid herein on the components and component parts of the preferred embodiment, it should be understood that the disclosure herein is only illustrative and does not limit the scope of this invention. Further many modifications and alterations can be made in the preferred embodiment without departing from the scope of this invention.
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We Claim:
1. A terminal stud for use in an electric motor, said terminal stud comprising an oblong body made of electric insulating material and adapted to be fitted in a terminal box of the electric motor and a plurality of terminals located in said oblong body electrically isolated from one another and extending from either side of said oblong body in a staggered manner.
2. A terminal stud as claimed in claim 1, wherein said oblong body is provided with a flange at one end of said oblong body and a nut at the other end of said oblong body in thread engagement therewith, said terminal stud being mounted on the bottom plate of the terminal box by locating the terminal stud in an opening provided in the bottom plate with the flange abutting one surface of the bottom plate and tightening the nut against the opposite surface of the bottom plate.
3. A terminal stud as claimed in claim 1, wherein the oblong body comprises a metallic sleeve fitted over said oblong body, said nut being in threading engagement with said sleeve.
Dated this 9th day of January 2007.
(Jose MA)
Of Khaitan & Co Agent for the Applicants
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