FORM 2
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 ARRANGEMENT FOR PREVENTING BRIDGE MOVEMENT DURING TRANSIT
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 the field of electromagnetic contactors, more particularly the present invention relates to an improved arrangement for locking the bridge movement and preventing damages.
BACKGROUND AND THE PRIOR ART
Electromagnetic contactor is a magnetically operated device for repeatedly establishing and interrupting electrical power circuit. Electromagnetic contactors comprises of an electromagnet, coil and bridge, all components enclosed and supported with the help of a housing.
Contactor usually handles heavy current loads like an electric motor, lighting or heating device. As contactors are used for high current load applications, they designed to control and reduce the arc produced when heavy currents are interrupted. A detachable arc chamber is connected with the housing for extinguishing the arc formed during the interruption of heavy current.
A contactor comprises of electromagnet, coil, bridges, contactors associated with the bridge. Electromagnets provide driving force for the contacts. An Ac/Dc supply is used to drive the coil of the contactors.
When the coil is energized, these electromagnets of the contactors starts winding up and this cause the movement of bridge associated with electromagnets. In an energized condition, the bridge coupled with electromagnet, moves along with the movement of electromagnets.
But in an unenergized condition, the bridge is free to move with the housing and this in turn could lead to breakage of bridge.
US6750746 talks about an electromagnetic switching device, especially a contactor with a locking means for contact Bridge. This electromagnetic

switching device includes a base, arc chamber removable from base, contact bridge support and spring loaded locking element, which can lock the contact bridge support when the arc chamber is taken off.
Corrugated padding's were put between the contacts to prevent the bridge movement of the contactor. However, in case the end user forgets to take out the padding before giving supply to the coil, the coil gets burnt due to open gap condition between the electromagnets.
The drawbacks of the prior art arrangement is that the bridge movement occurs which in turn results in bridge breakage.
There is therefore a need to provide with an improved arrangement where it will prevent the bridge movement and in turn will not result to bridge breakage.
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 arrangement adapted to prevent the bridge breakage occurring on account of rattling of electromagnetic contactor during transit.
Yet another object of the present invention is to provide an improved arrangement against any non standard practices and easy accessibility to end users.
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
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 accordance with the present embodiment of the invention, there is provided an improved arrangement for preventing the movement of bridges by rattling movement of electromagnetic contactor during transit.
In accordance with another embodiment of the invention, there is provided straps for locking the movement of bridges upon rattling movement during transit.
In accordance with another embodiment of the invention, the improved arrangement comprises of a housing, electromagnets, coil, and bridges associates with contacts.
In accordance with another embodiment of the invention, the housing comprises of front and rear housing.
In accordance with another embodiment of the invention, the bridge is coupled with electromagnet, and the movement of bridge occurs, when the coil is energized.
In accordance with other embodiment of the invention, the bridge is free to move inside the housing, when the coil is not energized and can be damaged.
In accordance with further embodiments of the invention, the straps passing through end of contacts and locks the bridge with top cover and prevent free movement inside housing in un energized state.

In accordance with further embodiment of the invention the front housing and rear housing provide the means for access the strap.
In accordance with further embodiment of the invention, a detachable arc chamber is connected with rear housing after putting the strap.
In accordance with further embodiment of the invention, the straps are made of different materials for improved performance, preferably nylon.
In accordance with further embodiment of the invention, straps passing through ends of contacts provide the locking of bridges with top cover, preventing the damages to bridges during rattling of contactor during transit.
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 contactor.
Figure 2 illustrates the contactor with the arc chamber.
Figure 3 illustrates the contactor with straps.
DETAILED DESCRIPTION OF THE ACCOMPANYING DRAWINGS
Accordingly in the present invention FIG.1 illustrates an electromagnetic contactor with a front housing (11), a rear housing (12), encloses a bridge (3) and a pair of straps (1) at both ends of bridges.

Two straps (1) are passing through ends of the bridge (3).
Front housing (11) and rear housing (12) provide the means of access for the straps (1).
FIG.2 illustrates arc chamber (13) detachably connected with the rear housing of the electromagnetic contactor. Arc chamber (13) of electromagnetic contactor is assembled with rear housing after putting up the strap.
Arc chamber (13) of the electromagnetic contactor is for extinguishing the arc forming during heavy power current interruption.
FIG.3 illustrates a contactor with a two straps (1) passing through the ends of bridges (3) and lock the bridges (3) with top cover.
In an unenergized condition the bridge (3) is free to move in the front housing (11) and rear housing (12).
Two straps (1) passing through the ends of bridges (3) locks the bridges with the top cover and prevent it from moving freely inside front housing (11) and rear housing (12).
Two straps (1) for locking the bridges (3) is made of different types of materials, preferably nylon.
Advantages
• The invention uses two straps for interlocking the bridge with top cover.
• The straps are visible from outside and can be easily removed.
• The straps prevent non standard practices such as non removal of corrugated padding placed between the contacts as earlier practices resulting into coil burning

WE CLAIM:
1. An improved arrangement for preventing bridge movement in an electromagnetic contactor, comprising:
a housing means including a front housing and a rear housing;
an electromagnetic means and a coil means;
plural bridge means consisting of contacts and coupled with said electromagnetic means, free or partially free to move in said housing corresponding to energising of said coil means ; and
one or more straps for preventing the free movement of said bridges.
2. An improved arrangement as claimed in claim 1, wherein said straps are passing through ends of said bridge providing a locking means for bridges with top cover.
3. An improved arrangement as claimed in claim 1, wherein said front housing and rear housing provides the means for access for said strap.
4. An improved arrangement as chimed in claim 1, wherein said rear housing is operatively connected to a detachable arc chamber.
5. An improved arrangement as claimed in claim 1, wherein said straps are made of one or more materials.

6. An improved arrangement as claimed in claim 5, wherein said material is nylon.
7. An improved arrangement as claimed in claim 1, wherein said straps passing through ends of said bridges provide the locking of said bridges with top cover preventing damages to said bridges during rattling of said contactor during transit.
8. An improved arrangement for preventing the bridge movement in
electromagnetic contactor as herein described and illustrated with reference to
accompanying drawings.