F0RM2
THE PATENTS ACT, 1970
(39 of 1970)
&
The Patents Rules, 2003
COMPLETE SPECIFICATION
(See section 10; rule 13)
1.Title of the invention: A MODULAR SAFETY DEVICE FOR
DISCONNECTION OF ELECTRICAL SUPPLY IN DISTRIBUTION BOARD
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 a modular safety device for disconnection of electrical supply in distribution boards. More particularly, the invention is concerned about providing safety to a human personnel during maintenance of Distribution Board. This is achieved by a unique mechanism provided in the device which helps in disconnecting supply when shield gets opened. The equipments/processes/field of technology/industry in which the present invention is used is the distribution boards and electric supply panel.
BACKGROUND OF THE INVENTION AND PRIOR ART
The safety and practicality are always two major characteristics to be researched for the electrical power distribution panels, boards and/or switches and power distribution supplies however, the current and conventional distribution boards/panels still cannot meet the requirements of said two characteristics. Since the power wires are directly connected to the switch or the outlet, the circuit breaker needs always to be in OPEN state when maintenance is in progress. Sometime, it has been found that negligence of the maintenance personnel has proved to be very fatal and has amount to loss of lives. Therefore, it is inconvenient to carry maintenance or repair work or removing or replacing the distribution panels or any part thereof, especially to the general family which knows little about electric engineering.
Till date the inventors have not found any mechanism in the prior art which could be used in the cover/doors of a distribution board or panel and act as a safety mechanism during commencement of a maintenance work.

In view of the above, it has been found by the present inventors that there still exists a need and space for providing with a safety mechanism in the covers/doors of a distribution board. It has been found that a unique mechanism provides tripping off the circuit breaker thus breaking the power supply with the opening of the cover/shield of a distribution board or panel. Further a detachable supply indicator is also integrated with the safety device which indicates the R, Y & B phases of 3 phase electrical supply.
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 modular safety device for disconnection of electrical supply in distribution boards.
Another object of the present invention sis to provide supply Indicator integrated with the distribution board.
Another object of the present invention is to provide a safety to human personnel during maintenance of Distribution Board.
These and other 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
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.
According to one of the aspect of the present invention there is provided a modular device for tripping of the tripper or aurum thereby tripping the supply when shield/cover of distribution boards/panels is attempted to be opened or opened, said device comprising:
a tripping mechanism which comprises a push-pull link mounted on a shield or a cover of the distribution board; wherein said push-pull link communicating therethrough the said shield or the cover with other components/parts of the device when the shield or the cover is in mounted condition;
connecting link pivotally mounted on said shield or cover;
a mechanism slider connected to said connecting link through a pin;
a spring rest; and
a spring mounted on said spring rest, wherein during attempt to open the shield/cover or opening of the shield/cover said spring gets compressed retaining spring energy in it; and wherein with the opening of the shield/cover the energy stored in the said spring is released to rotate the said connecting link in clockwise and counter clockwise direction and as the connecting link rotates in counter clockwise direction the slider connected to the connecting link through a pin moves linearly in downward direction for tripping.

According to another aspect of the present invention there is provided a detachable electrical supply indicator device operatively connected with the modular device for tripping of the tripper or aurum thereby tripping the supply when shield/cover of distribution boards/panels is attempted to be opened or opened as described herein above, said device comprising:
plurality of LED's adapted for multiple phase color indications i.e. phases of 3 phase electrical supply (in the present embodiment);
plurality of connecting leads operatively connected with said plurality of LED's adapted for supply for the LED;
wherein said LEDs being integrated with the modular device with a snap fit arrangement for the easy mounting & removal of said indicator.
According to another aspect of the present invention there is provided a modular device for tripping of the tripper or aurum thereby tripping the supply when shield/cover of distribution boards/panels is attempted to be opened or opened, said device comprising:
a tripping mechanism which comprises a push-pull link mounted on a shield or a cover of the distribution board; wherein said push-pull link communicating therethrough the said shield or the cover with other components/parts of the device when the shield or the cover is in mounted condition;
connecting link pivotally mounted on said shield or cover;
a mechanism slider connected to said connecting link through a pin;

a spring rest;
a spring mounted on said spring rest,
plurality of LED's adapted for multiple phase color indications;
wherein during attempt to open the shield/cover or opening of the shield/cover said spring gets compressed retaining spring energy in it; and wherein with the opening of the shield/cover the energy stored in the said spring is released to rotate the said connecting link in clockwise and counter clockwise direction and as the connecting link rotates in counter clockwise direction the slider connected to the connecting link through a pin moves linearly in downward direction for tripping; and wherein during tripping off said LEDs being connected to all the phases of the device indicate whether all the phases have been successfully tripped.
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 la illustrates the modular device of the present
invention.
Figure lb illustrates an exploded view of the device when cover
is removed.
Figure 2a illustrates Tripping of Aurum.
Figure 2b illustrates Tripping of Tripper.
Figure 2 c illustrates Mechanism slider.
Figure 3 illustrates Detachable electrical supply indicator.
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.
The present invention describes modular safety device for disconnection of electrical supply in case of Distribution Board when its shield gets opened. A detachable supply indicator is also integrated with the device which indicates the R, Y & B phases of 3 phase electrical supply.
The simple mechanism formed by using a compression spring and connecting links is used to disconnect the electrical supply when the shield of Distribution Board is opened. This device

provides safety to human personnel during maintenance of Distribution Board.
Advantages:
• Modular safety device
• Detachable supply indicator
Features:
1. It can trip two different design of products (Tripper or Aurum) when shield gets opened
2. Compact integrated replaceable three phase indicator
DETAILED DESCRIPTION OF THE ACCOMPANYING DRAWINGS
The fig 1 a} & fig 1 b) above shows the inside view of the device when cover is removed & exploded view of it respectively. The device is mainly divided into two parts.
1.Tripping Mechanism
2.Detachable electrical supply indicator
Tripping Mechanism :
The Tripping Mechanism is made up of following components as shown in fig
1.Push-pull link (1)
2.Pivoted connecting link (2)
3.Mechanism Slider (3)
4.Compression spring (4)

5.Spring Rest (5) 6.Pivot (6)
7. Horizontal protrusion (7)
8. Slant protrusion (8)
9. Pin joints (9, 10)
The above metioned components are shown in fig below
Tripper is having the tripping of the tripper and the aurum is having the tripping of the aurum.
Function of
1) Pivoted Connecting Link (2) :
As the name suggests it is pivoted as shown in above fig. A pin joint (9) is created with One end of the connecting link (2) and one of the ends of mechanism slider (3). The second pin joint (10) is created with other' end of the connecting link (2) and push-pull link (1) as shown in fig. The Connecting Link (2) rotates about pivot (6).
2)Spring Rest (5} :
It is a component on which one of the ends of the compression spring (4) is fixed.
The Push-pull link (1) whose two ends comes out of the device (When shield is opened) goes inside the device when shield of the Distribution Board is mounted. The push-pull link is substantially U shaped. At the same time the compression spring (4) mounted on spring rest (5) gets compressed. When a

technician or personnel tries to open the shield for maintenance work, the energy stored in the compressed spring (4) is released. Now this released spring energy is used to trip the devices which are coupled to the main device. Due to this released spring energy the connecting link pivoted at centre rotates in clockwise direction. As the connecting link (2) rotates in counter clockwise direction the slider (3) connected to a connecting link (2) through pin (9) moves linearly in downward direction. Thus the tripping of any of the two (Tripper & Aurum) devices is achieved.
As shown in fig 2 c) above the upper Horizontal protrusion (7) of Mechanism slider (3) is used for tripping of Aurum MCB & middle slant protrusion (8) is used for tripping of Tripper MCB.
As the name suggests Detachable electrical supply indicator is used for the indication purpose of 3 phase electrical supply. This indicator is integrated with the main device. A snap fit arrangement is provided for the easy mounting & removal of the indicator. In case of malfunctioning of LED's, the device can be easily removed & can be mounted back with new LED's. The required supply for the LED can be given through connecting leads.

WE CLAIM:
1. A modular device for tripping of the tripper or aurum
thereby tripping the supply when shield/cover of
distribution boards/panels is attempted to be opened or
opened, said device comprising:
a tripping mechanism which comprises a push-pull link mounted on a shield or a cover of the distribution board; wherein said push-pull link communicating therethrough the said shield or the cover with other components/parts of the device when the shield or the cover is in mounted condition;
connecting link pivotally mounted on said shield or cover;
a mechanism slider connected to said connecting link through a pin;
a spring rest; and
a spring mounted on said spring rest, wherein during attempt to open the shield/cover or opening of the shield/cover said spring gets compressed retaining spring energy in it; and wherein with the opening of the shield/cover the energy stored in the said spring is released to rotate the said connecting link in clockwise and counter clockwise direction and as the connecting link rotates in counter clockwise direction the slider connected to the connecting link through a pin moves linearly in downward direction for tripping.
2. A modular device for tripping of the tripper or aurum
thereby tripping the supply when shield/cover of

distribution boards/panels is attempted to be opened or opened, said device comprising:
a tripping mechanism which comprises a push-pull link mounted on a shield or a cover of the distribution board; wherein said push-pull link communicating therethrough the said shield or the cover with other components/parts of the device when the shield or the cover is in mounted condition;
connecting link pivotally mounted on said shield or cover;
a mechanism slider connected to said connecting link through a pin;
a spring rest;
a spring mounted on said spring rest,
plurality of LED's adapted for multiple phase color indications;
wherein during attempt to open the shield/cover or opening of the shield/cover said spring gets compressed retaining spring energy in it; and wherein with the opening of the shield/cover the energy stored in the said spring is released to rotate the said connecting link in clockwise and counter clockwise direction and as the connecting link rotates in counter clockwise direction the slider connected to the connecting link through a pin moves linearly in downward direction for tripping; and wherein during tripping off said LEDs being connected to all the phases of the device indicate whether all the phases have been successfully tripped.

3. Device as claimed in claim 1 or 2 wherein said push pull link is substantially U shaped.
4. Device as claimed in claim 1 or 2 wherein said mechanism slider comprising a horizontal protrusion for tripping the aurum MCB.
5. Device as claimed in claim 1 or 2 wherein said mechanism slider comprising a slanted protrusion for tripping the tripper MCB.
6. Device as claimed in claim 1 further comprising electrical supply indicator.
7. Device as claimed in claim 6 wherein said indicator is detachably mounted on the device.
8. A detachable electrical supply indicator device operatively connected with the modular device for tripping of the tripper or aurum thereby tripping the supply when shield/cover of distribution boards/panels is attempted to be opened or opened as described herein above, said device comprising:
plurality of LED's adapted for multiple phase color indications;
plurality of connecting leads operatively connected with said plurality of LED's adapted for supply for the LED;
wherein said LEDs being integrated with the modular device with a snap fit arrangement for the easy mounting & removal of said indicator.
9. Device as claimed in claim 8 wherein said LEDs are used for
three phase power supply.

10. A modular device for tripping of the tripper or aurum thereby tripping the supply when shield/cover of distribution boards/panels is attempted to be opened or opened as herein described and illustrated with reference to the accompanying drawings.