Title of Invention

A TRIP INDICATOR ASSEMBLY IN AN ELECTRICAL OPERATING MECHANISM

Abstract A trip indicator assembly in an Electrical Operating Mechanism/motor operator comprising actuator block (3), plurality of springs (13, 14) mounted on the actuator block (3), lever (4) operatively connected with the actuator block (3), indicator component (2), means (9) adapted for placing the indicator component (2) in operative connection with the actuator block (3) and means (24) for visual indication provided with the said indicator component (2). The plurality of springs comprises extension spring (14) for securing the indicator component (2) and compression spring (13) for holding the lever (4) in stable horizontal position. The indicator component (2) comprises indicator pin (9) for linear sliding motion of the indicator component (2) on the actuator block (3). Figure 7
Full Text FORM2
THE PATENTS ACT, 1970
(39 of 1970)
&
The Patents Rules, 2003
COMPLETE SPECIFICATION
(See section 10; rule 13)

1. Title of the invention.

A TRIP INDICATOR ASSEMBLY IN AN ELECTRICAL OPERATING MECHANISM




2. Applicant
(a) NAME : LARSEN & TOUBRO LIMITED
(b) NATIONALITY : Indian
(c) ADDRESS : L7 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 INVENTION
The present invention relates to a trip indicator assembly in an Electrical Operating Mechanism/motor operator. More particularly, it relates to a trip indicator assembly in an Electrical Operating Mechanism/motor operator adapted for displaying the exact breaker position on the motor operator even when the actual breaker knob position gets concealed due to mounting of the motor operator on the moulded case circuit breaker.
BACKGROUND ART
The Electrical Operating Mechanism (also known as motor operator) is a device for remote operation of a breaker by giving electrical supply. The operating principle might be either direct drive or stored energy. In case of direct drive mechanism, the operating gear is directly driven by the pinion. On the other hand in case of stored energy the motor is used to energize a spring whose stored energy is consequently utilized to operate these mechanism. The separable electrical contacts, operating mechanism, and tripping mechanism are typically disposed within the housing of the circuit breaker, such components typically cannot be visually inspected to determine the trip status of the circuit breakerand ascertain whether or not a tripping operation has occurred.
During breaking operation of the circuit breaker, the breaker knob may be disposed to three different positions viz. ON/OFF/TRIP. Whenever, there is any fault current (surges) in the power distribution line, circuit breakers generally used to protect the total power distribution system and the related equipments connected to the system.
ABB electrical operating mechanism (EOM) or motor operator teaches rotary indication wherein the linear motion of the knob is converted to rotary motion by means of gear. In the ABB EOM on tripping the whole mechanism comes to trip position. No arrangement for sliding the indicator keeping the rest of the mechanism in its initial position is found.
Further once the electrical operating mechanism (motor operator) is mounted on the circuit breaker (moulded case circuit breaker) the actual breaker knob position gets concealed, leading to lot of ambiguity.
Thus, there is a need to provide for a trip indicator, which would be able to display the exact breaker position on the motor operator for any instantaneous surge or fault current or voltages occurring in the power distribution system.
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OBJECT OF THE INVENTION
The basic object of the present invention is to provide an indicator to display correct position for the breaker knob i.e. ON/OFF/TRIP.
Another object is to provide for positive isolation of the breaker i.e. even after the motor operator unit is mounted on the breaker and the actual knob position gets concealed under the unit, the unit provides the exact breaker knob position indication.
SUMMARY OF INVENTION
Thus according to the basic aspect of the present invention there is provided a trip indicator assembly in an Electrical Operating Mechanism/motor operator adapted for displaying the exact breaker position on the motor operator, the said indicator assembly comprising:
(i) an actuator block;
(ii) plurality of springs mounted on the said actuator block;
(iii) lever operatively connected with said actuator block;
(iv) an indicator component on said actuator block;
(v) means adapted for placing the said indicator component in operative
connection with said actuator block and;
(vi) means for visual indication provided with the said indicator component.
DETAILED DESCRIPTION OF THE INVENTION
In the present invention the electrical operating mechanism (EOM) is mounted on the circuit breaker. The trip indicator assembly of the present invention comprises trip indicator component, an actuator block and a lever. The circuit breaker knob is held between the indicator component and the actuator block. Bracket means is provided in the trip indicator assembly of the present invention. The said bracket means is the actuator bracket fixed with small screws on the actuator block. The actuator bracket is adapted to operate the toggle switch at the right instant, which is provided in series to the motor to cut off the supply to the motor.
The actuator block is mounted on the nut placed on the shaft screw such that with the rotation of the shaft screw the actuator block can move in the linear direction. The shaft screw being connected to the shaft gear (big gear) rotates with the rotation of the shaft gear (big gear), which is directly engaged to the motor shaft pinion (small gear). When electrical supply is fed to the motor, the motor shaft pinion (small gear) leads to the rotation of the
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shaft gear (big gear), thereby rotating the shaft screw and hence moving the nut mounted actuator block over the shaft. The indicator pin is disposed in the protruded part of the indicator component as well as the actuator block and is adapted for placing the indicator component on the actuator block. The said indicator pin holds the indicator component in such a way that it is in a position of axial alignment with the actuator block. The indicator pin head rests on the indicator body and the terminating end of the pin is provided with a circlip adapted to prevent the pin from coming out of the hole provided on the indicator body and keeping the indicator pin in position. The terminating end of the indicator pin is provided with a slot 1 mm wide adapted for accommodating the circlip. The hole is so provided on the indicator body that the head of the indicator pin is properly nested inside the hole giving proper support to the indicator component and free sliding to the indicator component within the limits of the actuator block protrusions on either side.
The actuator block is extended in the bottom part to form a protrusion adapted for mounting plurality of spring means comprising compression spring and extension springs. The said protrusion comprises a nut bolt adapted for tight fixation of lever, which is held in a stable horizontal position with the help of the compression spring. There are two extension springs on the bolt fixed on either side on the extended protrusion of the actuator block and hooked into the holes provided on the indicator component. The compression and the extension springs are adapted for securing the indicator component to the actuator block during operation and for further alleviation of the operation. The said lever is adapted for holding the indicator component along, during the mechanism operation. The lever comprises of a front nose like portion giving a latch like profile adapted for holding or latching the indicator during operation.
The rotation of the motor shaft pinion (small gear) can be varied in either clockwise or anticlockwise direction. Thus depending on the varying polarity of supply given to the motor, the direction of rotation of the shaft screw is varied, and accordingly the movement of the actuator block mechanism is varied. This movement of the actuator block mechanism is adapted for moving the breaker knob to ON or OFF positions. The indicator component gets freed from the lever latch.
On tripping of the breaker from its ON position, the breaker knob moves to TRIP position, carrying the indicator component along with it. For all three breaker positions viz. ON/OFF/TRIP the correct indication is shown from the cover window. In OFF/ON cycle of the motor operator, the indicator component is firmly engaged by the lever and moves around with the whole actuating mechanism to carry the knob to ON position.
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The actuator block assembly is adapted for moving the circuit breaker knob, which is held between its indicator and actuator, to ON position. In the ON position, the rear edge of the lever slides against the carriage base end and it gets raised, leading to the disengagement of the indicator component and consequently the indicator is left free. When the breaker trips under ON conditions, the already free indicator component slides out over the indicator pin to come to the TRIP position under the weight of the breaker knob.
The indicator component of the present invention is provided with a label on the top surface. The said label comprises multi-colour bands. These different coloured bands are provided for exact indication of ON, TRIP or OFF/RESET. The bands are so provided on the top surface of the indicator component that proper indication for the breaker knob positions is visible through the window provided with the top cover of the electrical operating mechanism (EOM).
BRIEF DESCRIPTION OF THE ACCOMPANYING FIGURES
Figure 1 illustrates the trip indicator assembly of the present invention. Figure 2 illustrates the trip indicator assembly with the motor.
Figure 3 illustrates the disposition of breaker knob in the space between the indicator component and actuator block.
Figure 4 illustrates the nut and motor of the present invention.
Figure 5(a) illustrates the linkage between the lever and the indicator in ON position.
Figure 5(b) illustrates the linkage between the lever and the indicator in TRIP position.
Figure 5(c) illustrates the linkage between the lever and the indicator in OFF/RESET position.
Figure 6 illustrates an isometric view of the trip indicator assembly.
Figure 7 illustrates the front view of the trip indicator assembly of the present invention.
Figure 8 illustrates the lever of the present invention.
Figure 9 illustrates the labels for trip indication in the present invention.
Figure 10 illustrates indicator pin alongwith the circlip.
Figure 11 illustrates the indicator pin with slot in the present invention.
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Detail Description Of The Accompanying Figure
In figure 1 the trip indicator assembly of the present invention is illustrated. In the figure the circuit breaker knob (1) is held between the indicator component (2) and the actuator block (3). The lever (4) is mounted on the protrusion (11) of the actuator block (3) adapted for proper engagement and disengagement of the indicator component (2). The actuator block (3) is mounted on the nut (10) (shown in figure 4) of the shaft screw (6), which is connected to the shaft gear or big gear (7). The shaft gear or the big gear (7) is directly engaged to the motor shaft pinion or small gear (8) (shown in figure 2). The indicator pin (9) is disposed in the actuator block (3) and holds the indicator component (2). The actuator bracket (5) is fixed with small screws (12) on the actuator block (3). The actuator bracket (5) is adapted to operate the toggle switch (not shown in the figures) at the right instant, which is provided in series to the motor to cut off the supply to the motor.
In figure 3 the disposition of breaker knob in the space between the indicator component and actuator block is illustrated. In the figure the breaker knob (1) is placed in between the indicator component (2) and the protrusion (11) of the actuator block (3) actuator block (3). The compression spring (13) holds the lever (4) in a horizontal position. The extension spring (14) on the bolt (15) fixed on either side on the extended protrusion (11) of the actuator block (3).
In figure 5(a) the linkage between the lever and the indicator in ON position is illustrated. In the figure the actuator block (3) moves the circuit breaker knob (1) to the ON position. The rear end of the lever (4) slides over the carriage base (12) and the lever (4) is raised. In figure 5(b) the breaker knob (1) moves the indicator component (2) to the TRIP position, while the actuator block (3) remains stationary in the ON position. The indicator component (2) is moved to the TRIP position by the sliding action of the indicator pin (9). In figure 5(c) the linkage between the lever and the indicator in OFF/RESET position is illustrated. The indicator component (2) is engaged with the lever (4) in the OFF/RESET position.
In figure 6 the isometric view of the trip indicator assembly is illustrated. In the figure the indicator pin head (16) is nested in the hole (17) provided in the indicator body (18). The indicator body (18) comprises slot (19) for accommodating the shaft screw (6) (shown in figure 1). The indicator window (20) is provided in the indicator body (18) and in the said indicator window (20), the lever (4) is disposed.
In figure 7 the front view of the trip indicator assembly of the present invention is illustrated. The indicator pin-head (16) (shown in figure 6) provided with a circlip (21) is adapted to prevent the indicator pin (9) from coming out of the hole (17) provided on the indicator body
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(18). The top surface (22) of the indicator component (2) comprises of label (24) (shown in figure 9)
In figure 8 the lever of the present invention is illustrated. The lever (4) comprises of a front nose like portion (23) for holding or latching the indicator component (2) during operation.
In figure 10 the indicator pin alongwith the circlip is illustrated. The terminating end of the indicator pin (9) is provided with a circlip (21) adapted to keep the indicator pin (9) in position. The terminating end of the indicator pin (9) is provided with a slot (25) (as shown in figure 11)1 mm wide adapted for accommodating the circlip (21).
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We claim
1. A trip indicator assembly in an Electrical Operating Mechanism/motor operator
adapted for displaying the exact breaker position on the motor operator, the said
indicator assembly comprising:
(i) an actuator block;
(ii) plurality of springs mounted on the said actuator block;
(iii) lever operatively connected with said actuator block;
(iv) an indicator component on said actuator block;
(v) means adapted for placing the said indicator component in operative
connection with said actuator block and;
(vi) means for visual indication provided with the said indicator component.
2. A trip indicator assembly as claimed in claim 1, wherein the means for placing the said indicator component comprises indicator pin adapted for holding the indicator component in a position of axial alignment with the actuator block.
3. A trip indicator assembly as claimed in claims 1 and 2, wherein the indicator pin comprises circlip adapted to prevent the indicator pin from coming out of hole provided on the indicator body.
4. A trip indicator assembly as claimed in claims 1 to 3, wherein the indicator pin is adapted for linear sliding motion of the indicator component on the actuator block.
5. A trip indicator assembly as claimed in claims 1 to 4, wherein the actuator block comprises of extended bottom part forming a protrusion.
6. A trip indicator assembly as claimed in claim 1, wherein the lever operatively connected with said actuator block provides for a latch like profile adapted for holding/latching the indicator during operation.
7. A trip indicator assembly as claimed in claim 6, wherein said lever is adapted to restrict motion of the indicator component by engagement disengagement with the same.
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8. A trip indicator assembly as claimed in claim 1, wherein the plurality of springs mounted on the said actuator block comprises compression spring and extension springs.
9. A trip indicator assembly as claimed in claim 8, wherein the compression spring is adapted for holding the lever in a stable horizontal position.
10. A trip indicator assembly as claimed in claims 8 and 9, wherein the extension springs are adapted for securing the indicator component to the actuator block and provide easy operation.
11. A trip indicator assembly as claimed in claims 1 to 10, wherein the trip indicator component comprises protrusions adapted for proper disposition of the means for placing the said indicator component on said actuator block.
12. A trip indicator assembly as claimed in claim 1, wherein said means for visual indication provided on the top surface of the trip indicator component comprises a label comprising plurality of different coloured bands.
13. A trip indicator assembly as claimed in claim 12, wherein the plurality of different coloured bands comprising three indication bands adapted for indicating exact ON, TRIP or OFF/RESET position of the circuit breaker knob.
14. A trip indicator assembly as claimed in claims 1 to 6, wherein the actuator block is mounted on a nut placed on shaft screw adapted for providing linear to and fro motion to said actuator block.
15. A trip indicator assembly as herein described and illustrated with reference to accompanying figures.
Dated this 8th day of February 2005

9

Title: A TRIP INDICATOR ASSEMBLY IN AN ELECTRICAL OPERATING MECHANISM
ABSTRACT
A trip indicator assembly in an Electrical Operating Mechanism/motor operator comprising actuator block (3), plurality of springs (13, 14) mounted on the actuator block (3), lever (4) operatively connected with the actuator block (3), indicator component (2), means (9) adapted for placing the indicator component (2) in operative connection with the actuator block (3) and means (24) for visual indication provided with the said indicator component (2). The plurality of springs comprises extension spring (14) for securing the indicator component (2) and compression spring (13) for holding the lever (4) in stable horizontal position. The indicator component (2) comprises indicator pin (9) for linear sliding motion of the indicator component (2) on the actuator block (3).
Figure 7

Documents:

141-MUM-2005 CORRESPONDENCE(09-11-2009).pdf

141-MUM-2005-ABSTRACT(GRANTED)-(13-9-2011).pdf

141-mum-2005-abstract.doc

141-mum-2005-abstract.pdf

141-mum-2005-affidavit(10-2-2005).pdf

141-MUM-2005-CLAIMS(AMENDED)-(1-7-2011).pdf

141-MUM-2005-CLAIMS(AMENDED)-(30-8-2011).pdf

141-MUM-2005-CLAIMS(GRANTED)-(13-9-2011).pdf

141-mum-2005-claims.doc

141-mum-2005-claims.pdf

141-mum-2005-correspondence(10-8-2009).pdf

141-MUM-2005-CORRESPONDENCE(16-6-2010).pdf

141-MUM-2005-CORRESPONDENCE(18-8-2011).pdf

141-MUM-2005-CORRESPONDENCE(26-7-2011).pdf

141-MUM-2005-CORRESPONDENCE(30-3-2009).pdf

141-MUM-2005-CORRESPONDENCE(9-11-2009).pdf

141-MUM-2005-CORRESPONDENCE(IPO)-(22-9-2011).pdf

141-mum-2005-correspondence-received.pdf

141-mum-2005-description (complete).pdf

141-MUM-2005-DESCRIPTION(GRANTED)-(13-9-2011).pdf

141-mum-2005-drawing(10-2-2005).pdf

141-MUM-2005-DRAWING(GRANTED)-(13-9-2011).pdf

141-mum-2005-drawings.pdf

141-mum-2005-form 1(10-5-2005).pdf

141-mum-2005-form 1(14-3-2005).pdf

141-mum-2005-form 13(10-5-2005).pdf

141-mum-2005-form 18(15-10-2007).pdf

141-MUM-2005-FORM 2(GRANTED)-(13-9-2011).pdf

141-MUM-2005-FORM 2(TITLE PAGE)-(10-2-2005).pdf

141-MUM-2005-FORM 2(TITLE PAGE)-(GRANTED)-(13-9-2011).pdf

141-mum-2005-form-1.pdf

141-mum-2005-form-2.doc

141-mum-2005-form-2.pdf

141-mum-2005-form-26.pdf

141-mum-2005-form-3.pdf

141-MUM-2005-GENERAL POWER OF ATTORNEY(30-8-2011).pdf

141-mum-2005-petition under rule 137(10-5-2005).pdf

141-MUM-2005-POWER OF ATTORNEY(14-3-2005).pdf

141-MUM-2005-REPLY TO EXAMINATION REPORT(1-7-2011).pdf

141-MUM-2005-REPLY TO HEARING(30-8-2011).pdf

abstract1.jpg


Patent Number 248942
Indian Patent Application Number 141/MUM/2005
PG Journal Number 37/2011
Publication Date 16-Sep-2011
Grant Date 13-Sep-2011
Date of Filing 10-Feb-2005
Name of Patentee LARSEN & TOUBRO LIMITED
Applicant Address L&T HOUSE, BALLARD ESTATE, MUMBAI-400 001
Inventors:
# Inventor's Name Inventor's Address
1 DUGGAL, NIDHI SWITCHGAR DESIGN & PRODUCT DEVELOPMENT CENTER, LARSEN & TOUBRO LIMITED, ELECTRICAL SECTOR-(EBG), POWAI WORKS(EAST),SAKI VIHAR ROAD, MUMBAI-400 072.
PCT International Classification Number H01H 71/04
PCT International Application Number N/A
PCT International Filing date
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 NA