FORM2
THE PATENTS ACT, 1970
(39 of 1970)
&
The Patents Rules, 2003
COMPLETE SPECIFICATION
(See section 10; rule 13)
1. Title of the invention. - AN IMPROVED AUXILIARY CONTACT
ACTUATION ARRANGEMENT
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 an auxiliary contact actuation arrangement. More particularly, the invention is concerned about an improved auxiliary contact actuation arrangement which is a factory fitted arrangement of auxiliary contact where the mechanism can switch on two. one and no auxiliary contact at a time as per the application requirement.
BACKGROUND OF THE INVENTION
US2002/0117387 i.e. "Auxiliary switch actuation arrangement" - describes about an auxiliary switch activation by mechanism along with the opening and closing of main contacts. A lever has a first end removably connectable to operating mechanism and second end removably connectable to auxiliary switch. A spring is mechanically coupled to the lever. The lever provides an assisting force to the operating mechanism as the spring imparts a rotational bias on the lever.
US6867670B2 i.e. "Circuit breaker with auxiliary switches and mechanism for operating the same" - claims the operating mechanism comprises a handle and a toggle mechanism connected to the handle for manual operation of the separable contacts between the open state and the closed state and the linkage comprises a pivoted member engaged by the toggle mechanism to operate the contact state auxiliary switch.
The disadvantages of the existing auxiliary contact arrangement incorporated in changeover device are such that one and only one auxiliary contact can be made on at a time, Moreover this arrangement can operate only when the changeover device is operated from side.

Thus, there is a need to overcome the problems of the prior art. Therefore, present inventors have developed an improved auxiliary contact actuation arrangement. which is capable of actuating two. one and no auxiliary contact at a time. There is no constraint for the position of mechanism i.e. it can be side operated as well as centre operated. This arrangement is factory fitted in such a way that auxiliary contacts are not accessible without de-assembling the mechanism cassette thereby mal-operation of auxiliary contacts can be avoided.
OBJECTS OF THE INVENTION
An object of the present invention is to overcome the problems/disadvantages of the prior art.
Another object of the present invention is to provide an improved auxiliary contact actuation arrangement
These and 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
According to one aspect of the present invention there is provided an improved auxiliary contact actuation arrangement, said arrangement comprising:
housing;
shaft means; rotor means;

bush means;
plurality of auxiliary contact means operatively mounted on said housing;
plurality of lever means operatively connected to said auxiliary contact means;
wherein said shaft means being rotatably partially disposed inside said rotor means whereby outside surface of said rotor means being partially or fully secured in said bush means;
wherein said shaft means when rotated through an appropriate angle provides simultaneous rotation of both said bush means and rotor means so as to drive said lever means acutating said auxiliary contact means to provide indication of the ON or OFF state of conventional switch disconnector: and
wherein said bush means being provided with plurality of positions achieved by actuating plurality of said auxiliary contact means or one auxiliary contact means or none of the auxiliary contact means at a time.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
Other features as well as the advantages of the invention will be clear from the following description.
In the appended drawings:
Fig. 1 illustrates an exploded view of factory fitted auxiliary contact arrangement.
Fig. 2 illustrates a bottom view of auxiliary contacts arrangement prior to the assembling of mechanism.

Fig. 3 illustrates a position 1. Fig. 4 illustrates a position 2.
Fig. 5 illustrates a position 3. Fig. 6 illustrates a position 4.
DETAILED DESCRIPTION OF THE ACCOMPANYING DRAWINGS
In the following detailed description, reference is made to the accompanying drawings that form a part hereof, and illustrate the best mode presently contemplated for carrying out the invention. Further functioning of the arrangement has been discussed below to describe the way the arrangement operates. However, such description should not be considered as any limitation of scope of the present unit. The structure thus conceived is susceptible of numerous modifications and variations, all the details may furthermore be replaced with elements having technical equivalence. In practice the materials and dimensions may be any according to the requirements, which will still be comprised within its true spirit.
According to a preferred embodiment of the invention, there is provided an improved auxiliary contact actuation arrangement. As shown in figure 1. the present invention is a factory fitted auxiliary contact arrangement positively coupled with shaft (2) and vertical rotor (3). The bush (4) is having four different positions, as shown in figures 3, 4. 5. and 6. which are achieved by vertically shifting the bush up and down. Any of these positions can be fixed by tightening the bush (4) with vertical rotor (3) by a screw (7) at desired position after aligning the holes of bush and vertical rotor (3). As shown in figures 3 and 4. Position 1 and 2 involve actuating either of the two auxiliary contacts (5. 6) at a lime. As shown in figure 5, Position 3 involves actuating

both auxiliary contacts (5, 6) at a time. As shown in figure 6, Position 4 involves actuating none of the auxiliary contacts (5, 6).
As shown in figure 2. auxiliary contacts (5, 6) are click-fitted into the slots of top housing (1) prior to the assembling of the mechanism. 6a and 5a are the levers of auxiliary contact I (6) and auxiliary contact 2 (5) respectively. Shaft (2) is inserted inside the vertical rotor (3) and bush (4) is inserted outside the vertical rotor (3). With 90 degree rotation of the shall (2) . bush (4) rotates along with vertical rotor (3) and the peeps of vertical rotor (3) drives the lever of the auxiliary contacts (5.6) and actuates. Thus the auxiliary contacts can be actuated to give indication of the ON or OFF state of the switch disconnector.
Position I: In position 1 only one auxiliary contact 1 (i.e.6) is actuated.
Position 2: In position 2 only one auxiliary contact 2 (i.e.5) is actuated.
Position 3: In position 3 both the auxiliary contacts (i.e.5 & 6) are actuated.
Position 4: In position 4 none of the auxiliary contact is actuated.
The novel feature is the bush arrangement for different combination of actuation. Even if the auxiliary contacts are factory fitted there is no need to de-assembling the mechanism housings. All one has to do is to loosen the screw (7) by which shaft is held at its position and changing the- vertical orientation of the vertical rotor.
ADVANTAGES OF THE INVENTION
1. No constraint for the position of the mechanism
2. Mal-operation of auxiliary contacts can be avoided

Constructional elements
Bottom housing -8
Vertical rotor -3
Bush - 4
Screw -7
Auxiliary contact 1 - 6
Auxiliary contact2 - 5
Top housing - 1
Shaft - 2
Levers - 6a, 5a

WE CLAIM:
1. An improved auxiliary contact actuation arrangement, said arrangement comprising: housing;
shaft means:
rotor means;
bush means;
plurality of auxiliary contact means operatively mounted on said housing:
plurality of lever means operatively connected to said auxiliary contact means;
wherein said shaft means being rotatably partially disposed inside said rotor means whereby outside surface of said rotor means being partially or fully secured in said bush means;
wherein said shaft means when rotated through an appropriate angle provides simultaneous rotation of both said bush means and rotor means so as to drive said lever means acutating said auxiliary contact means to provide indication of the ON or OFF state of conventional switch disconnector; and
wherein said bush means being provided with plurality of positions achieved by actuating plurality of said auxiliary contact means or one auxiliary contact means or none of the auxiliary contact means at a time.

2. Arrangement as claimed in claim 1. wherein said rotor means is a vertical rotor means.
3. Arrangement as claimed in claim 1. wherein said appropriate angle of rotation of said shaft is about 90 degrees.
4. Arrangement as claimed in claim 1, wherein said bush means is movable up and down.
5. Arrangement as claimed in claim 1, wherein said bush means comprising screw means.
6. Arrangement as claimed in claim 1, wherein said bush means having four positions namely position 1, position 2. position 3 and position 4.
7. Arrangement as claimed in claim 1 or 6, wherein position 1 being achieved by actuating one auxiliary contact means at a time.
8. Arrangement as claimed in claim 1 or 6, wherein position 2 being achieved by actuating one auxiliary contact means at a time.
9. Arrangement as claimed in claim 1 or 6, wherein position 3 being achieved by actuating two auxiliary contact means at a time.
10. Arrangement as claimed in claim 1 or 6, wherein position 1 being achieved by actuating none of the auxiliary contact means at a time.
11. Arrangement as claimed in claim 1 further comprising said arrangement being operated from side and/or centre.

12. Arrangement as claimed in claims 1 and 2 wherein said rotor means is vertically orientable.
13. An improved auxiliary contact actuation arrangement as herein substantially described and illustrated with the accompanying drawings.