FORM 2
THE PATENT ACT 1970
&
The Patents Rules, 2003
COMPLETE SPECIFICATION (See section 10 and rule 13)
1. TITLE OF THE INVENTION:
Moving Bridge for a Switching Device/Disconnector
2. APPLICANT:
(a) NAME: Larsen & Toubro Limited
(b) NATIONALITY: Indian Company registered under the
provisions of the Companies Act-1956.
(c) ADDRESS: LARSEN & TOUBRO LIMITED,
L&T House, Ballard Estate, P. O. Box: 278, Mumbai 400 001, India
3. PREAMBLE TO THE DESCRIPTION:
COMPLETE
The following specification particularly describes the invention and the manner in which it is to be performed.

Moving Bridge for a Switching Device/Disconnector
Field of the invention
The present invention relates to field of a switching device, and more particularly, the invention relates to a moving bridge for a change over switch disconnectors -* (hereinafter referred as "COSD").
Background of the invention
The disconnectors, commonly called switches, fuses-switches or changeover switches are designed to distribute energy to electrical installations or to control alternating low voltage industrial equipment, for example 380 V, and in a current range from a few dozen to a few thousand amps. Presently available _ COSD are used to switch between two powers supplies when required. The COSD in the art are known to utilize a moving bridge to translate between the terminals powered by two power sources. It is also known that for effective electrical switching very fast operation is desired. In order to achieve a fast operation high spring forces are used in the switching mechanisms.
The COSD known in the prior art include mechanism members moving under huge amount of forces and carry huge momentum, which result in heavy impact on resting walls acting as stopping points. Due to repeated impacts over a period of time the resting walls suffer mechanical damage. This leads to mechanical failure of the COSD even though electrical life is still left further leading to ineffective utilization of the COSD.
Accordingly, there exists a need to provide a switching device/disconnector which overcomes drawbacks of the prior art.
Objects of the invention

An object of the present invention is to increase impact strength of a moving bridge by localized reinforcement in the COSD.
Another object of the present invention is utilizes cost effective, optimally designed alternate raw material for the invention.
Yet another object of the present invention is to increase the life of the switching device.
Summary of the invention
Accordingly, the present invention provides a moving bridge for a switching device/disconnector. The moving bridge is housed in a mechanism cassette. The mechanism cassette operates two switch-disconnectors and provides mechanical interlock therebetween. The mechanism cassette includes a pin member capable of hitting one side of a wall of the moving bridge wall in order to slide and complete a circuit, characterized in that the moving bridge includes reinforcement member mounted thereon thereby increasing impact strength of the moving bridge.
Brief description of drawings
Other features as well as the advantages of the invention will be clear from the following description.
In the appended drawings:
Figure 1 shows a front view of a moving bridge with a reinforcement member in accordance with the present invention;

Figure 2 shows an isometric view of the moving bridge with the reinforcement member of figure 1;
Figure 3 shows an isometric view of the reinforcement member in accordance with the present invention;
Figure 4 shows an isometric view of a pin assembled in a mechanism cassette in accordance with the present invention; and
Figure 5 shows an isometric view of a mechanism cassette assembly of the COSD in accordance with the present invention.
Detailed description of the invention
For a thorough understanding of the present invention, reference is to be made to the following detailed description, including the appended claims, in connection with the above-described drawings. Although the present invention is described in connection with exemplary embodiments, the present invention is not intended to be limited to the specific forms set forth herein. It is understood that various omissions and substitutions of equivalents are contemplated as circumstances may suggest or render expedient, but these are intended to cover the application or implementation without departing from the spirit or scope of the claims of the present invention. Also, it is to be understood that the phraseology and terminology used herein is for the purpose of description and should not be regarded as limiting.
The present invention provides a moving bridge for a switching device/disconnector. The present invention reduces the mechanical failure of the switch due to impacts occurring during switching operations of the COSDs' using a reinforcement member integrated into the switching device/disconnector.

Referring to Fig 1-5, there is shown a mechanism cassette (100) operating two switch disconnector (not shown). Specifically, figure 4 shows the mechanism cassette (100). The mechanism cassette (100) includes a moving bridge (10), and pin member (20) as shown in figure 1, 2 and 4 respectively. The moving bridge (10) slides within the mechanism cassette (100) with a help of pin member (20). The moving bridge (10) contains entire contact assembly. The pin member (20) hits side wall of the moving bridge (10) when torque to operate a top switch disconnector of two switch connectors is applied. The pin member (10) hits one side of the wall of the moving bridge (10) in order to slide the moving bridge (10) and complete the circuit thereby switching between two powers supplies when required.
Characterized in that the moving bridge (10) includes a reinforcement member (12) mounted thereon which increasing impact strength of the moving bridge (10). As shown in figure 1 and 4, the reinforcement member (12) is secured on the moving bridge (10) with help of fixing mean. The fixing mean used in the present invention is screws-bolt and the like. In an alternate embodiment, the reinforcement member (12) is embedded on the moving bridge (10). The reinforcement member (12) of the present invention is made up of material such as rubber, steel and the like which can increase the impact strength of the moving bridge (10). The construction, position and material of the reinforcement member (1) are chosen in manner that the impact is reduced to great extent. Thus the life of the switch connector is increased.
Generally, when the pin member (20) of the mechanism cassette (100) hits the moving bridge (10), the load bearing area gets shear out. The reinforcement member (12) is mounted on the moving bridge (2) of the present invention in such a manner that it increases impact strength of the moving bridge (10) thereby preventing mechanical damage thereto.
Advantages of the invention

1. The reinforcement member (12) provides increased impact strength to the moving bridge (2) of the switching device / disconnector.
2. The reinforcement member (12) of the present invention increases the life of the switching device.
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, and 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 omissions and substitutions of equivalents are contemplated as circumstances may suggest or render expedient, but such omissions and substitutions are intended to cover the application or implementation without departing from the spirit or scope of the claims of the present invention.

We Claim:
1. A moving bridge for a switching device/disconnector, the moving bridge housed in a mechanism cassette, the mechanism cassette being capable of operating two switch-disconnectors and providing mechanical interlock therebetween, the mechanism cassette having a pin member capable of hitting one side of a wall of the moving bridge wall in order to slide the moving bridge and completing a circuit,
characterized in that the moving bridge includes a reinforcement member mounted thereon thereby increasing impact strength of the moving bridge.
2." The moving bridge as claimed in claim 1, wherein the reinforcement member is made of any one of rubber, and steel.
3. The moving bridge as claimed in claim 1, wherein the reinforcement is assembled to the moving bridge by means of screws or is inserted during molding process.