FORM 2
THE PATENT ACT 1970
&
The Patents Rules, 2003
COMPLETE SPECIFICATION (See section 10 and rule 13)
1. TITLE OF THE INVENTION:
"AUXILIARY CONTACT DEVICE AND A KINEMATIC ADAPTED THEREFOR"
2. APPLICANT:
(a) NAME: Larsen & Toubro Limited
(b) NATIONALITY: Indian Company registered under the
provisions of the Companies Act-1956.
(c) ADDRESS: L& T House
Ballard Estate, P. 0. Box No. 278 Mumbai 400 072, INDIA
3. PREAMBLE TO THE DESCRIPTION:
COMPLETE
The following specification particularly describes the invention and the manner in which it is to be performed.

AUXILIARY CONTACT DEVICE AND A KINEMATIC ADAPTED THEREFOR
Field of invention
The present invention relates to secondary switching devices and more particularly to an auxiliary contact device.
Background of the Invention
Secondary switching devices, such as auxiliary contacts, normally work in conjunction with primary switching equipments such as for example circuit breakers, relays, and contactors. These auxiliary contact devices are normally physically linked to the primary switching equipments for being interlocked with the control circuits of these primary devices for indication of their state of operation. The auxiliary contacts are traditionally formed as integral part of the primary switching devices or modularly snapped on the surface of these primary switching devices. The generally known auxiliary contacts are such as for example a trip contact, an ON/OFF contact, a trip and ON/OFF contact with selector (TAG). These contacts use a dedicated kinematic for allowing their operation.
The drawback of the known auxiliary contacts is that these auxiliary contacts need to be realized with different components for their own kinematic. For example, each known accessory of the component can occupy one or half of the module such as for example auxiliary contact ON/OFF indication allows remote indication of main contact status, auxiliary contact trip indication allows indication of whether main device has been tripped and TAC allows indication of whether main device has been turned off or tripped. However, the different kinematic between those accessories implies different production machines, molds and procedures which implies highly complex storehouse management

and mass cost reduction which is non-effective. These auxiliary contact devices essentially require alternative kinematic for such auxiliary contacts that need to be housed in lesser modules the volume available for module is limited.
Therefore, there exists a need of auxiliary contact device which overcomes all the drawbacks of the prior art.
Objects of the invention
It is an object of the present invention to provide an auxiliary contact device adapted to handle a plurality of operating conditions of an electrical device,
Another object of the present invention is to provide a kinematic mechanism of the auxiliary contact device having a means for actuating a moving contact, a means for indicating a plurality of operating conditions and a means for selecting an operating condition of the electrical device.
Summary of the invention
Accordingly, the present invention provides an auxiliary contact device configured for a plurality of operating conditions of an electrical device. The auxiliary device is having an insulating casing that contains a pair of fixed contacts and a pair of moving contacts. The auxiliary device is having a kinematic mechanism. The kinematic mechanism includes a means for actuation, a means for indication, and a means for selection.
The means for actuation is adapted for actuating at least one of the moving contacts. The means for actuation includes a lever group and a slider. The lever group enables movement of the slider between a first slider position and a second slider position. The lever group includes a transmission lever, a disengagement lever, an actuation lever and an arced lever, The disengagement

lever rotatably connects to the transmission lever. The actuation lever rotatably connects to the disengagement lever. The actuation lever includes a lug and a returning means. The arced lever engages with the disengagement lever and the actuation lever. The means for actuation includes a hook shaped lever and a second connecting lever. The hook shaped lever includes a tooth that engages with the slider.
The means for indication is adapted for indicating a plurality of operating conditions of the electrical device through an indication lever. The indication lever projects to constitute a visual indicator. The indication lever engages with the slider by a first connecting lever. The means for indication optionally indicates at least two operating conditions selected from a group consisting of an ON/OFF operating condition, a trip condition, and a trip and ON/OFF contact (TAC) operating condition.
The means for selection is adapted for selecting the operating condition of the auxiliary device wherein the means for selection is a selector constituted by a lever. The selector connects to a second connecting lever.
Brief description of the invention
Reference will be made to embodiments of the invention, examples of which may be illustrated in the accompanying figures. These figures are intended to be illustrative, not limiting. Although the invention is generally described in the context of these embodiments, it should be understood that it is not intended to limit the scope of the invention to these particular embodiments.
FIG. 1 is a front view of an auxiliary contact device constructed in accordance with the present invention in an OFF condition;
FIG. 2 shows the auxiliary contact device of FIG. I in an ON condition;

FIG. 3 illustrates the auxiliary contact device of FIG. 1 in a first phase of a tripped condition;
FIG. 4 shows the auxiliary contact device of FIG. 1 in a last phase of the tripped condition;
FIG. 5 illustrates the auxiliary contact device of FIG. 1 in an OFF condition wherein the auxiliary contact device is ready to trip;
FIG. 6 shows the auxiliary contact device of FIG. 1 in an OFF condition wherein the auxiliary contact device is tripped;
FIG. 7 shows the auxiliary contact device of FIG. 1 in an ON condition wherein the auxiliary contact device is ready to trip:
FIG. 8 illustrates the auxiliary contact device of FIG. I in a test condition;
FIG. 9 shows the auxiliary contact device of FIG. 1 in a first phase of a tripped condition;
FIG. 10 shows the auxiliary contact device of FIG. 1 in a last phase of tripped condition;
FIG. 11 illustrates the auxiliary contact device of FIG. 1 selected for an ON/OFF operation wherein the auxiliary contact device is in an OFF condition;
FIG. 12 shows the auxiliary contact device of FIG. 1 selected for the ON/OFF operation wherein the auxiliary contact device is in an ON condition;

FIG. 13 shows the auxiliary contact device of FIG. 1 selected for the ON/OFF operation wherein the auxiliary contact device is in a first phase of a tripped condition;
FIG. 14 shows the auxiliary contact device of FIG. 1 selected for the ON/OFF operation wherein the auxiliary contact device is in a last phase of a tripped condition;
FIG. 15 shows the auxiliary contact device of FIG. 1 selected for a TRIP operation in OFF condition wherein the auxiliary contact device is ready to trip;
FIG. 16 shows the auxiliary contact device of FIG. 1 selected for the TRIP operation in OFF condition wherein the auxiliary contact device is tripped;
FIG. 17 shows the auxiliary contact device of FIG. 1 selected for the TRIP operation in ON condition wherein the auxiliary contact device is ready to trip;
FIG. 18 shows the auxiliary contact device of FIG. 1 selected for the TRIP operation in TEST condition;
FIG. 19 shows the auxiliary contact device of FIG. 1 selected for the TRIP operation in a first phase of a tripped condition; and
FIG. 20 shows the auxiliary contact device of FIG. 1 selected for the TRIP operation in a last phase of the tripped condition.
Detail description of the invention
The foregoing objects of the present invention are accomplished and the problems and shortcomings associated with the prior art techniques and

approaches are overcome by the present invention as described below in the preferred embodiments.
Referring to FIGS. 1-2, an auxiliary contact device 200 (device 200, hereinafter) in accordance with a preferred embodiment of the present invention is illustrated. The device 200 includes a drum 10 that is having a slot 12. The drum 10 is rotatably coupled to a transmission lever 20 through the slot 12. The transmission lever 20 is rotatably coupled to a disengagement lever 30 through a slot 32 defined on the disengagement lever 30. The device 200 includes an actuation lever 40 that is rotatably coupled to the disengagement lever 30. The device 200 includes an arced lever 50 that engages with the disengagement lever 30 by a tooth 52. The arced lever 50 engages with the actuation lever 40 and rotates about an axle 40A. The axle 40A is fixed to the casing 55 and preferably communicates with a returning means 60. The actuation lever 40 is positioned with a lug 42. The device 200 includes an insulating casing 55. The insulated casing 55 includes a first moving contact 100 and a second moving contact 110. The insulated casing 55 includes a first fixed contact 120 and a second fixed contact 130. The device 200 includes a plurality of connection terminals (not shown).
The device 200 includes a kinematic mechanism which comprises a means for actuation, a means for indication and a means for selection respectively. The means for actuation is adapted for actuating the first moving contact 100 and the second moving contact 110. The means for indication is adapted for indicating a plurality of operating conditions of an electrical device. The means for selection is adapted for selection of a plurality of operating conditions of the device 200. The means for indication is capable of indicating at least two of the following operating conditions selected from an ON/OFF condition, a trip condition, and a trip and ON/OFF contact (TAC) condition. Therefore, it may be seen that same device 200 is capable of being an ON/OFF, a trip, and, a trip and ON/OFF contact (TAC).The means for selection is capable of selecting one of the

operating conditions selected from the ON/OFF, the trip, and, the Trip and ON/OFF Contact (TAC).
The means for actuation in this one particular embodiment includes a lever group and a slider 80. The lever group includes the transmission lever 20, the disengagement lever 30, the actuation lever 40 and the arced iever 50 in this one preferred embodiment. The lever group enables the slider 80 to siidably move between a first slider position and a second slider position. In this one embodiment, the lug 42 is configured to assist in movement of the slider 80 between the first slider position and the second slider position. In the first slider position, the first moving contact 100 and first fixed contact 120 are in a closed position. In the second slider position, the second moving contact 1 10 and the second fixed contact are in an open position.
The slider 80 includes a restraining means 90 adapted to be positioned inside the slider 80. The restraining means 90 is a spring in this one preferred embodiment. However, it is understood that other types of restraining means 90 may be utilized in conjunction with the device 200 in other alternative embodiments of the present invention. The restraining means 90 is configured to be compressed or released per the movement of the siider 80.
The means for indication of the plurality of operating conditions is a visual indicator in this one preferred embodiment that is constituted by a projection of at least one of the levers of the kinematic mechanism. In this one particular embodiment, the kinematic mechanism of device 200 includes an indication lever 170 that projects to constitute the visual indicator thereby engaging with the slider 80 through a first connecting lever 140. The first connecting lever 140 and the indication lever 170 are rotatable about an axle 140A and are fixed to the casing 55. The axle 140A includes a returning means 150.

Referring now to FIGS. 1-4, the device 200 operating in an ON/OFF condition using the means for selection wherein various stages/positions of the device 200 during the ON/OFF operating condition are described.
As shown in FIG. 1, in operation, the transmission lever 20 rotates to move the disengagement lever 30 depending upon the conditions of the electrical device. The disengagement, lever 30 moves the actuation lever 40. The actuation lever 40 rotates counterclockwise for releasing the returning means 70. The actuation lever 40 moves the slider 80 to close the first moving contact 100 and the first fixed contact 120 thereby initiating the first connecting lever 140 which enables counterclockwise rotation of the indication lever 170 for indicating an OFF position of device 200 (Refer FIG. 1).
As shown in FIG. 2. in operation, the transmission lever 20 rotates to move the disengagement lever 30 depending upon the condition of the electrical device, The disengagement lever 30 moves the actuation lever 40. The actuation lever 40 rotates clockwise for compressing the returning means 70. The actuation lever 40 moves the slider 80 to close a second moving contact I 10 and the second fixed contact 130 thereby opening the first moving contact 100 and the first fixed contact 120 respectively. This initiates the first connecting lever 140 to enable clockwise rotation of the indication lever 170 for indicating an ON position of device 200.
As shown in FIG. 3. in operation, a trip pin positioned on a seat 190 disengages a tooth 30a on the disengagement lever 30. This facilitates the device 200 to attain a trip initiated condition.
As shown in FIG. 4, in operation, the returning means 70 and the restraining means 90 rotate counterclockwise responsive to disengagement of the actuation lever 40 of the device 200 by the disengagement lever 30. In this position, the slider 80 moves to close the first moving contact 100 and the first fixed contact

120 in order to open the second moving contact ! 10 and the second fixed contact 130. This facilitates the device 200 to attain a trip finished condition.
Referring to FIG. 5, the means for actuating the first moving contact 100 and the first fixed contact 110 further includes a hook shaped lever 510 and a second connecting lever 520. The hook shaped lever 510 has a tooth 540 for engaging with the slider 80. The hook shaped lever 510 is fixedly coupled to the second connecting lever 520. The second connecting lever 520 is movable in a slot 520a. The hook shaped lever 510 and the second connecting lever 520 are rotatable about a fixed axle 530 having a tooth 540 that is movable in a slot 540a fixed on the casing 55. The hook shaped lever 510 and second connecting lever 520 adapted to respectively engage with the slider 80, the first connecting lever 140, the transmission lever 20 and the disengagement lever 30 in this one embodiment.
Referring now to FIGS. 5-10. in operation, the device 200 operating in a trip condition using the means for selection wherein various stages/positions of the device 200 during the trip operating condition are illustrated.
As shown in FIG. 5, in operation, the device 200 is in an OFF condition ready to trip depending upon the condition of the electrical device wherein the tooth 540 is engaged with the slider 80 in the first slider position. In this position, the second moving contact 110 and the second fixed contact 130 are in a closed condition.
As shown in FIG. 6, in operation, the device 200 is in an OFF condition tripped depending upon the condition of the electrical device wherein the tooth 540 is disengaged with the slider 80. In this position, the second moving contact 110 and the second fixed contact 130 attain an opened condition. In this position, the First moving contact 100 and the first fixed contact 120 attain a closed condition.

As shown in FIG. 7, in operation, the device 200 is in an ON condition ready to trip depending upon the condition of the electrical device wherein the hook shaped lever 510 and the second connecting lever 520 engage with the slider 80. This enables the slider 80 to close the second moving contact 110 and the second fixed contact 130, thereby rotating the indication lever 170 in a clockwise direction for indicating that the device 200 is in the ON condition.
As shown in FIG. 8, in operation, the device 200 is in a test condition wherein the indication lever 170 is manually moved in a counterclockwise direction for testing the functionality of the device 200. In this condition, the slider 80 is manually moved to close the first moving contact 100 and the first fixed contact 120 thereby indicating that the device 200 is in non-stable position that is the test condition in accordance with an embodiment of the present invention.
As shown in FIG. 9, in operation, the device 200 is in a first phase tripped condition wherein the transmission lever 20 and the disengagement lever 30 press upon the hook shaped lever 510. In this position, the second connecting lever 520 rotates clockwise to disengage the slider 80 with the tooth 540 of the lever 510 to indicate that the device 200 is in a first phase tripped condition.
As shown in FIG. 10, the device 200 is in a last phase tripped condition wherein the hook shaped lever 510 and the second connecting lever 520 disengage with the slider 80. In this position, the slider 80 moves to the second slider position thereby indicating that the device 200 is in the last phase tripped condition.
Referring to FIGS. 11-20, the device 200 operating in a Trip and ON/OFF contact (TAC) condition using the means for selection wherein various stages/positions of the device 200 during the Trip and ON/OFF contact (TAC) condition are described. In this one particular embodiment, the means for selection is a selector 1110. The selector 1110 is a lever that engages to the

second connecting lever 520. The selector rotates to fixedly engage with the second connecting lever to facilitate the Trip and ON/OFF contact (TAC) condition.
As shown in FIG. 11. in operation, the device 200 is in an OFF position wherein the actuation lever 40 rotates in a counterclockwise direction enabling the slider 80 to close the second moving contact 110 and the second fixed contact 130 responsive to the rotation of the selector 1 i 10 for engagement with the second connecting lever 520. In this position, the indication lever 170 rotates counterclockwise to indicate that the device 200 is in the OFF position.
Referring to FIG. 12, in operation, the device 200 is shown in an ON position wherein the selector 1110 fixedly engages with the second connecting lever 520. In this position, the actuation lever 40 rotates clockwise. The clockwise rotation ofthe actuation lever 40 enables the slider 80 to close the second moving contact 110 and the second fixed contact 130. The clockwise rotation ofthe actuation iever 70 enables the slider 80 to open the first moving contact 100 and the first fixed contact 120. In this position, the indication lever 170 rotates in a clockwise direction to indicate that the device 200 is in the ON position.
Referring to FIG. 13, in operation, the device 200 is shown in a first phase of a tripped condition wherein the trip pin is positioned on the seat 190 and disengages the tooth 30a on the disengagement lever 30.
As shown in FIG. 14, in operation, the device 200 is in a last phase of the tripped condition wherein the selector 1110 fixedly engages with the second connecting lever 520. In this position, the actuation lever 40 is disengaged by the disengagement lever 30. In this position, the returning means 70 and the restraining means 90 rotate counterclockwise to move the slider 80. In this position, the slider 80 moves to close the first moving contact 100 and the first

fixed contact 120. In this position, the slider 80 moves to open the second moving contact 110 and the second fixed contact 130.
As shown in FIG. 15, in operation, the device 200 is in an OFF tripped condition wherein the selector 1110 rotates to disengage with the second connecting lever 520. In this position, the tooth 540 engages with the slider 80 in the first slider position thereby closing the second moving contact 110 and the second fixed contact 130 to indicate that the device 200 is in the OFF tripped condition.
Referring to FIG. 16. in operation, the device 200 is shown in an OFF tripped condition wherein the selector 1110 disengages with the second connecting lever 520, In this position, the tooth 540 disengages from the slider 80. In this position, the slider 80 moves to open the second moving contact 110 and the second fixed contact 130. In this position, the slider 80 moves to close the first moving contact 100 and the first fixed contact 120.
Referring to FIG. 17, in operation, the device 200 is shown in an ON condition ready to trip wherein the selector 11! 0 disengages from the second connecting lever 520. In this position, the hook shaped lever 510 and the second connecting lever 520 enable the slider 80 to close the second moving contact 110 and the second fixed contact 130 such that the indication lever 170 rotates in a clockwise direction to indicate that the device 200 is in an ON condition ready to trip.
As shown in FIG. 18, in operation, the device 200 is in a test condition wherein the indication lever 170 is manually moved in a counterclockwise direction for testing the functionality of the device 200, In this condition, the selector 1110 disengages from the second connecting lever 520. In this condition, the slider 80 is manually moved to close the first moving contact 100 and the first fixed contact 120 thereby indicating that the device 200 is in non-stable position that is the test condition in accordance with an embodiment of the present invention.

Referring to FIG. 19, in operation, the device 200 is shown in a first phase tripped condition. In this condition, the transmission lever 20 and disengagement lever 30 press on the hook shaped lever 510. In this condition, the second connecting lever 520 rotates in a clockwise direction and the slider 80 disengages with the tooth 540 of hook shaped lever 510 thereby indicating that the device 200 is in the first phase tripped condition.
As shown in FIG. 20, in operation, the device 200 is in a last phase tripped condition wherein the selector 1110 disengages the second connecting lever 520 such that the hook shaped lever 510 and the second connecting lever 520 disengage the slider 80. In this condition, the slider moves in the second slider position thereby indicating that the device 200 is in the last phase tripped condition.
Referring to FIGS. 1-20, the auxiliary contact device 200 is an auxiliary contact accessory device in accordance- with the present invention. In various embodiments of the present invention, the returning means is a torsional spring and the restraining means is a compression spring. In various embodiments of the present invention, the electrical device is a circuit breaker.
The foregoing descriptions of specific embodiments of the present invention have been presented for purposes of illustration and description. They are not intended to be exhaustive or to limit the present invention to the precise forms disclosed, and obviously many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the present invention and its practical application, to thereby enable others skilled in the art to best utilize the present invention and various embodiments with various modifications as are suited to the particular use contemplated. It is understood that various omission and substitutions of equivalents are contemplated as circumstance may suggest or render expedient,

but such are intended to cover the application or implementation without departing from the spirit or scope of the present invention.

We Claim:
1. An auxiliary contact device configured for a plurality of operating
conditions of an electrical device, the auxiliary device having an insulating
casing containing a pair of fixed contacts and a pair of moving contacts, the
auxiliary device having a kinematic mechanism, the kinematic mechanism
comprising:
a means for actuation adapted for actuating at least one of the moving contacts, the means for actuation having a lever group and a slider, the lever group enabling movement of the slider between a first slider position and a second slider position, the lever group including a transmission lever, a disengagement lever, an actuation lever and an arced lever, the disengagement lever rotatably connecting to the transmission lever, the actuation lever rotatably connecting to the disengagement lever, the actuation lever having a lug and a returning means, the arced lever engaging with the disengagement lever and the actuation lever, the means for actuation having a hook shaped lever and a second connecting lever, the hook shaped lever having a tooth for engagement with the slider;
a means for indication adapted for indicating a plurality of operating conditions of the electrical device via an indication lever, the indication lever projecting outwardly to constitute a visual indicator, the indication lever engaging with the slider by a first connecting lever; and
a means for selection adapted for selecting the operating condition of the auxiliary device, the means for selection having a selector connecting to a second connecting lever.
2. The kinematic of the auxiliary contact device as claimed in claim 1,
wherein the means for indication optionally indicates at least two operating
conditions selected from a group consisting of an ON/OFF operating condition,
a trip condition, and a trip and ON/OFF contact (TAC) operating condition.

3. The kinematic of the auxiliary contact device as claimed in claim 1, wherein the selector is a lever.