CLIAMS:1. A gear arrangement of an electrically operated mechanism for driving an equipment, said arrangement comprising:
a worm gear arrangement connected to the shaft of a motor for increasing and transmitting the torque delivered by said motor;
at least three spur gear arrangement in communication to each other connected to said worm gear arrangement for increasing the motor torque and transmitting said increased motor torque to said electrically operated mechanism for driving said equipment;
wherein said gear arrangement facilitate conversion of the torque delivered by said motor into the torque requisite for operation of said equipment.

2. The arrangement as claimed in claim 1, wherein one of said spur gear arrangement connected to shaft of said electrically operated mechanism for driving said equipment.

3. The arrangement as claimed in claim 2, wherein said spur gear arrangement comprises a manual override gear for disengaging said gear arrangement from the shaft of said electrically operated mechanism.

4. The arrangement as claimed in claim 1, wherein said worm gear arrangement comprises a worm gear and worm wheel for changing the axis of rotation.

5. The arrangement as claimed in claim 1, wherein a set of plate(s) and a supporting pin(s) is provided for holding said gear arrangement at a position during transmitting the torque.

6. The arrangement as claimed in claim 1, wherein a worm gear support connected to one of said plate for maintaining the axis of said worm gear of said worm gear arrangement.

7. The arrangement as claimed in claim 1, wherein said equipment is selected from a group comprises a switch, a switch-disconnector, a changeover switch-disconnector or the like.
,TagSPECI:TECHNICAL FIELD OF THE INVENTION
The Present invention relates but not limited to Gear arrangement in Electrically Operating mechanism(EOM) for Changeover Switch. The present invention provides a gear arrangement of an electrically operated mechanism for driving a Changeover switches . The present invention provides a higher torque conversion which enables its use for CO-SDs demanding higher torque i.e. suitable for higher ratings.
BACKGROUND AND THE PRIOR ART
Changeover switches are widely used to switch between primary and backup power source. These Switches comprise of 2 Switch-Disconnectors (SD) connected back-to-back. Changeover switches have three stable positions-ON1, OFF, ON2. The Torque required to switch ON or OFF a Changeover switch varies depending upon the constructional requirement of the mechanism inside it. The Torque requirement generally increases as the rating (in terms of Ampere) of the Changeover switch increases. Electrically operating mechanism is used to operate the Changeover switches using electrical power providing easiness to the user.EOM drives the shaft of the Changeover switch through a gear arrangement powered by a motor as the input. Electrical supply to EOM is controlled through a control circuit which takes the current position of Changeover Switch as the input. The gear arrangement is such that the power from the motor is effectively converted & transmitted to the driving shaft by which the Changeover switch is operated. The Driving shaft acts as the connecting member between the EOM &Changeover switch which transmits the torque generated by the EOM to the mechanism of Changeover switch . The invention described here is the gear arrangement inside the EOM which magnifies the torque delivered by the motor to the torque required by the Changeover switch .
Existing EOMs use either a Solenoid or a Gear train. The Mechanism construction could be of Stored energy in nature (Energy is stored through a spring and released when required) or Direct drive (Energy generated is directly transmitted and utilized at the same moment). Stored energy mechanism requires a spring strong enough to hold the energy required to operate the Switch and latching mechanism to prevent discharge of spring till it is needed. Direct drive mechanisms transfer energy instantly without any spring or latching mechanism to store the energy.
The existing mechanisms have either more number of gear sets to attain high torque multiplication or use bulky gears which are bigger in size to attain the same.
To overcome the disadvantages of the present in existing mechanisms, the present invention provides an optimized construction such that it is neither bulky nor having more number of gear sets is described herein. This provides a higher torque conversion which enables its use for Changeover switches demanding higher torque i.e. suitable for higher ratings.

OBJECTS OF THE INVENTION
A basic object of the present invention is to overcome the disadvantages/drawbacks of the known art.
Another object of the present invention is to provide a gear arrangement of an electrically operated mechanism for driving an equipment.

Another object of the present invention is to provide a gear arrangement for higher torque conversion which enables its use for Changeover switches.

These and other advantages of the present invention will become readily apparent from the following detailed description read in conjunction with the accompanying drawings.

SUMMARY OF THE INVENTION
The following presents a simplified summary of the invention in order to provide a basic understanding of some aspects of the invention. This summary is not an extensive overview of the present invention. It is not intended to identify the key/critical elements of the invention or to delineate the scope of the invention. Its sole purpose is to present some concept of the invention in a simplified form as a prelude to a more detailed description of the invention presented later.
In an aspect of the present invention, there is provided a gear arrangement of an electrically operated mechanism for driving an equipment, said arrangement comprising:
a worm gear arrangement connected to the shaft of a motor for increasing and transmitting the torque delivered by said motor;
at least three spur gear arrangement in communication to each other connected to said worm gear arrangement for increasing the motor torque and transmitting said increased motor torque to said electrically operated mechanism for driving said equipment;
wherein said gear arrangement facilitates conversion of the torque delivered by said motor into the torque requisite for operation of said equipment.
Other aspects, advantages, and salient features of the invention will become apparent to those skilled in the art from the following detailed description, which, taken in conjunction with the annexed drawings, discloses exemplary embodiments of the invention.

BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
The following drawings are illustrative of particular examples for enabling methods of the present invention, are descriptive of some of the methods, and are not intended to limit the scope of the invention. The drawings are not to scale (unless so stated) and are intended for use in conjunction with the explanations in the following detailed description.
Figure 1 illustrates the Motor inside the EOM
Figure 2 illustrates the worm gear support
Figure3 illustrates the functionality of a Worm gear & Worm wheel combination.
Figure 4 illustrates the arrangement of second gear stage.
Figure 5 illustrates the arrangement of third stage of gear
Figure 6 illustrates the complete gear train with all four stages of gears
Figure 7, 8, 9 and 10 illustrates the top view of the various stages of gear assembly
Figure 11 illustrates the side view of the entire EOM assembly
Persons skilled in the art will appreciate that elements in the figures are illustrated for simplicity and clarity and may have not 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 OF THE INVENTION
The following description with reference to the accompanying drawings is provided to assist in a comprehensive understanding of exemplary embodiments of the invention as defined by the claims and their equivalents. It includes various specific details to assist in that understanding but these are to be regarded as merely exemplary. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the embodiments described herein can be made without departing from the scope and spirit of the invention. In addition, descriptions of well-known functions and constructions are omitted for clarity and conciseness.
The terms and words used in the following description and claims are not limited to the bibliographical meanings, but, are merely used by the inventor to enable a clear and consistent understanding of the invention. Accordingly, it should be apparent to those skilled in the art that the following description of exemplary embodiments of the present invention are provided for illustration purpose only and not for the purpose of limiting the invention as defined by the appended claims and their equivalents.
It is to be understood that the singular forms “a,” “an,” and “the” include plural referents unless the context clearly dictates otherwise.
By the term “substantially” it is meant that the recited characteristic, parameter, or value need not be achieved exactly, but that deviations or variations, including for example, tolerances, measurement error, measurement accuracy limitations and other factors known to those of skill in the art, may occur in amounts that do not preclude the effect the characteristic was intended to provide.
Accordingly, the present invention providesa gear arrangement of an electrically operated mechanism for driving a Changeover switches
The Gear arrangement in the EOM is responsible for the conversion of the torque delivered by the motor which acts as the prime mover into the torque required by the Changeover switch . The arrangement also transmits the energy about the axis of the motor output shaft into the axis at which the torque is required by Changeover switch . The relationship between Torque and speed is always inverse in a gear system. This gear system increases the Torque by reduction in speed.
The invention comprises of 4 gear stages that increases the torque delivered by the motor to a higher value suitable to drive theChangeover switch. The arrangement is in such a way that a high conversion ratio is achieved within the limited footprint and less number of gear stages. The first stage comprises of a Worm gear which changes the axis of rotation and also provides a very high torque conversion ratio. The other 3 gear stages are made of spur gears which provide subsequent torque multiplication to the required level.
The gear system is constrained through a set of plates and supporting pins which hold the gear sets in its location and transmit the torque effectively. The Position of the gear stages and the overall construction of EOM have been explained with the help of necessary illustrations in 5.
EOM as an integral unit acts as user friendly mechanism that facilitates the operation of Changeover Switches or any other equipment which demands a high value of torque for its operation. The gear arrangement forms the integral part of an EOM which forms the basis of Torque conversion. The gear arrangement described here is constructed such a way that a high torque conversion is achieved with limited number of gear stages and limited space.
Construction:
The main embodiment of present inventioncomprises aGear arrangement which provides the necessary torque conversion (Increase) such that the power delivered by the motor is magnified to satisfy the requirements of the equipment which the EOM drives or operates. The driven equipment could be a Switch, Switch-Disconnector, Changeover Switch-Disconnector or any device that requires a torque and rotational force to operate. For the purpose of illustration, an EOM that drives a Changeover Switch-Disconnector is being described which does not limit the applicability of the EOM.
Figure 1 shows the Motor (1) inside the EOM which acts as the prime mover for the entire system providing a lower value of torque that it is capable of. The shaft (2) is the end point of the Gear system through which the necessary torque is delivered by the EOM to the Changeover switch or any equipment that it is supposed to drive. A worm gear (3) is connected to the end shaft of the motor (1) which transmits the torque to its gear pair. The Worm wheel along with a spur gear attached to it (4) forms the first stage of torque conversion. The Worm gear & Worm wheel combination also changes the axis around which the torque is transmitted.
Figure 2shows the worm gear support (5) which maintains the axis of the worm gear (3).
Figure 3illustrates the functionality of a Worm gear & Worm wheel combination. The change in axis of rotation is also illustrated. In the system described herein, the Worm gear acts as the driver while the Worm wheel acts as the driven gear. The torque is transmitted from Worm gear to Worm Wheel.
Figure 4 shows the second gear stage (6) which is a Spur gear combination that engages with the first gear stage (4). The torque gets multiplied in this stage based on the ratio between the diameter and no. of teeth in the set.
Figure 5 shows the arrangement of third stage of gear (7) which is also a Spur gear stage which transmits the energy or Torque similar to the previous gear stage (6)
Figure 6 shows the complete gear train with all four stages of gears. The last stage of gear system (8) connects the entire system with the shaft (2) which delivers the torque generated by the gear system and motor to the equipment to be driven. The fourth gear stage (8) is also a spur gear set which performs a similar function to the previous stages of gear. The Final stage also comprises of a Manual Override gear (9) which is utilized to disengage the gear system from the shaft when necessary.
Figure 7 to 10 show the top view of the various stages of gear assembly. These illustrate the equivalence of Images 1 to 6.
Figure 11 shows the side view of the entire EOM assembly in which all the gear stages are constrained through the supporting plates (10, 11 & 12). Bottom plate (10) connects one end of the first & second gear stages. It also holds the Motor (1) & Worm support (5).
FEATURES AND BENEFITS OF THE INVENTION
1. Gear arrangement is in such a way that the required conversion of Torque is achieved effectively between the Input axis (Motor) and Output axis (Shaft).
2. Use of lower number of gear stages enable less linkage& reduced chances of failure.
3. Use of worm gear in first stage enables very high increment in torque multiplication.
4. The same design/arrangement can be used to operate any equipment demanding rotational input within designed torque.

NOVEL FEATURES:
· Higher Torque output with minimal gear stages
· Flexible design that can adapt to any equipment requiring rotational driving/operating torque as input.
· Effective use of space
· Simple mechanism with Reduced chances of Failure.