FORM 2
THE PATENT ACT 1970
&
The Patents Rules, 2003
COMPLETE SPECIFICATION (See section 10 and rule 13)
1. TITLE OF THE INVENTION:
"Anti-Vibration Spring Rest For Moving Contacts"
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.

Anti-Vibration Spring Rest For Moving Contacts
Field of the invention
The present invention relates generally to an anti-vibration spring rest for moving contacts in a switching device, and more particularly to the anti-vibration spring rest for electromagnetic contactor.
Background of the invention
Generally, in a switching device, a contact, for example, a moving contact can vibrate while carrying current due to electrical forces, mechanical reasons and assembly features, while operating. Specifically, the moving contact gets bounce while making the contact. Further, during an electrical performance like current making and current carrying, contact spring and the moving contact can be unstable as stated above.
Accordingly, there exists a need to provide a device which overcomes the drawbacks of the prior art
Objects of the invention
An object of invention is to eliminate contact vibration while carrying current.
Yet another object of the present invention is to reduce contact bounce while making the contact thereto.
Another object of the present invention is to stabilize a contact spring and a moving contact during the electrical performance like current making and current carrying.

Summary of the invention
Accordingly, the present invention provides an anti-vibration spring rest for moving contacts. The anti-vibration spring rest comprises a base member having a conical peep portion configured thereon. The conical peep portion capable of receiving a contact spring of the moving contact thereon. Further, the anti-vibration spring rest comprises a first arm extending from one side of the base member and a second arm extending from a side opposite to the first arm. The first arm and the second arm together provide a resting area for the contact spring. The end portions of the first arm and the second arm forms contact with the moving contact. Furthermore, the anti-vibration spring rest comprises at least two grabbing members configured on either side of the base member. Each grabbing member grabs a bridge wall of the switchgear thereby preventing misalignment during operation.
Brief description of the drawings
Figure 1 shows perspective view of an anti-vibration spring rest in accordance with the present invention:
Figure 2 shows a side view of the anti-vibration spring rest of figure I;
Figure 3 shows a top view of the anti-vibration spring rest of figure 1;
Figure 4 shows A-A sectional view of the anti-vibration spring rest of figure I;
Figure 5 and 6 shows assembly of the anti-vibration spring rest with a moving contact; and

Figure 7 shows switchgear assembly showing a gap in which the contact spring can be mounted.
Detailed 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.
The present invention provides an anti-vibration spring rest for moving contacts. The anti-vibration spring rest eliminates the contact vibration while carrying current, and reduce the contact bounce while making. Further, the anti-vibration spring rest simultaneously acts as a spring rest for a contact spring. The anti-vibration spring rest leads to mechanical stabilization of contact spring and moving contact along with the electrical performance like current making and current carrying improvement.
Here the scope, object and other features of the invention are described in the relation to electromagnetic contactor. However, it may be evident to those skilled in the art that the scope, object and other features are also applicable for any electrical device with moving electrical contacts, which as a function does the job of current making, current carrying and current breaking.
Referring now to figures 1-6, there are shown various views of an anti-vibration spring rest (100) for moving contacts (200) of the switchgear, in accordance with the present invention. Specifically figure 1 shows a perspective view of the anti-vibration spring rest (100) (hereinafter, the spring rest (100)) and figure 2 shows a side view of the spring rest (100). The spring rest (100) comprises a base member (10), a first arm (20), a second arm (30), and at least two grabbing members (40).

The base member (10) includes a conical peep portion (12) configured thereon. Specifically, the conical peep portion (12) is capable of receiving a contact spring of the moving contact (200) thereon. Specifically, the conical peep portion (12) holds the contact spring (not shown) effectively and thus provides the required alignment and stability. The base member (10) includes at least two arms attached thereto. The at least two arms are specifically designed leaf shaped arms.
The first arm (20) extends from one side of the base member (10) and the second arm (30) extend from a side opposite to the first arm (20). The first arm (20) and the second arm (30) together provides a resting area (26) for the contact spring. Specifically, an end portion (22) of the first arm (20) and an end portion (32) of the second arm (30) forms contact with the moving contact (200). The first arm (20) and the second arm (30) together forms load distributing portion (24) which distributes load of the contact spring along the moving contact (200) uniformly with the help of air gap (34) formed between the base member (10) and the moving contact (200). The first arm (20) and the second arm (30) together along the moving contact (200), effectively and uniformly distributes the contact spring force, which is otherwise concentrated and applied to only centre portion of the moving contact (200). Thus, making the contact more stable, efficient and appropriate use of the contact spring force, providing required damping.
Further, the at least two grabbing members (40). also known as hooks are configured on either side of the base member (10). Each grabbing member, for example, the first grabbing member (42) and the second grabbing member (44) grabs a bridge wall (not numbered) of the switchgear thereby preventing misalignment during operation. Specifically, the at least two grabbing members (40) hold the bridge, so that while operation, the anti-vibration spring rest does not move or misaligned itself. Specifically, figure 7 shows switchgear assembly

showing a gap (50) in which the anti-vibration spring rest (100) is configured and above which contact spring can be mounted.
This uniformly and appropriately distribution of contact spring force by the spring rest (100) helps to reduce the contact resistance thereby reducing the temperature rise in the contact system while operating the electromagnetic contactor. Thus the spring rest (100) improves contactor performance and helps to eliminate contactor failure due to high temperature rise. Specifically, the spring rest (100) helps to reduce excess bounce, which can otherwise lead to contact welding by arcing. This certainly improves the contactor performance and contactor life.
Advantages of the invention
1. The spring rest (100) uses a leaf spring design and arrangement with a spring rest provision.
2. The spring rest (100) ensures proper distribution of force along the both end of the moving contact.
3. The spring rest (100) helps to eliminate contact vibration while carrying current, reduce the contact bounce while making and simultaneously acts as a spring rest for contact spring.
4. The spring rest (100) provides mechanical stabilization to contact spring and moving contact along with the electrical performance like current making and current carrying improvement.
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 anti-vibration spring rest for moving contacts, the anti-
vibration spring rest comprising:
a base member having a conical peep portion configured thereon, the conical peep portion capable of receiving a contact spring of the moving contact thereon;
a first arm extending from one side of the base member and a second arm extending from a side opposite to the first arm, the first arm and the second arm together provides a resting area for the contact spring, wherein the end portions of the first arm and the second arm forms contact with the moving contact;
at least two grabbing members configured on either side of the base member, each grabbing member grabs a bridge wall of the switchgear thereby preventing misalignment during operation.
2. The anti-vibration spring rest as claimed in claim 1, wherein the
first arm and the second arm distribute load of the contact spring along the
moving contact uniformly with the help of air gap formed between the base
member and the moving contact.