FORM2
THE PATENTS ACT, 1970
(39 of 1970)
&
The Patents Rules, 2003
COMPLETE SPECIFICATION
(See section 10; rule 13)
1. Title of the Invention. - IMPROVED MECHANICAL INTERLOCKING
ASSEMBLY
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:

TECHNICAL FIELD OF THE INVENTION
The present invention relates to a mutual locking device. More particularly, the invention relates to an improved mechanical interlocking assembly providing interlocking of electromagnetic contactors thereby preventing simultaneous actuation.
BACKGROUND AND THE PRIOR ART
Conventional Mechanical interlock kit assembly consists of one mechanical interlock kit 2 sandwiched between two electromagnetic contactors 1. The arrangement is made in such a way that the interlock kit 2 is sandwiched between the two contactors 1. Then, the whole assembly is supported on base plate 7 which forms the base for holding the assembly altogether consisting of interlock kit 2 sandwiched between the contactor 1.
The problems of the prior art are such that interlocking the contactors requires an additional circuitry and mechanical life of the contactors is short. There is also a problem of simultaneous closing of the contactor. Making of assembly is not easy.
Thus, there is a need to overcome the problems of the prior art. Therefore, the present inventors have developed an improved mechanical interlocking assembly for use in conjunction with two electromagnetic contactors to prevent the contactors from being actuated simultaneously.
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 mechanical interlocking assembly.
Yet another object of the present invention is to improve the mechanical life of the contactors and interlocking kit
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
There is provided a mechanical interlocking assembly.
According to one embodiment of the present invention, there is provided improved mechanical interlocking assembly providing interlocking of electromagnetic contactors thereby preventing simultaneous actuation.
Other embodiment of the present invention provides a mechanical interlock means sandwiched between a pair of said electromagnetic contactors.
Yet other embodiment of the present invention provides a pair of locators holding said mechanical interlock means
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
In the appended drawings:
Fig 1 illustrates earlier Mechanical interlock kit assembly.

Fig 2 illustrates an improved mechanical interlocking assembly.
Fig 3 illustrates an exploded view of a mechanical interlock assembly
DETAILED 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.
Reference is first invited to Fig 1 where the conventional mechanical interlocking system is shown.
Fig. 2 shows the arrangement in accordance with the present invention.
Fig. 3 shows the different components of thee assembly separately. It shows mechanical interlock means, a pair of electromagnetic separators etc.
The invented system is thus an improved mechanical interlocking assembly providing interlocking of electromagnetic contactors thereby preventing simultaneous actuation.
DETAILED DESCRIPTION OF THE INVENTION
Accordingly in the present invention, there is provided an improved mechanical interlocking assembly. As shown in figure 2, the mechanical interlocking assembly comprises of two locators 3 and one mechanical interlock kit 2 meant for providing interlocking of two electromagnetic contactors 1. The arrangement is made in such a

way that the interlock kit 2 is sandwiched between the two contactors 1. Then, the whole assembly is supported by two locators 3 such that it firmly holds the assembly consisting of interlock kit 2 sandwiched between the contactor 1.
The use of two locators 3 eliminates the requirement of base plate for providing the base for holding the assembly altogether. The locator used in the invention hold the contactors firmly meant for providing interlocking. Also, the addition of locators makes the assembly compact and user friendly. Figure 3 shows an exploded view of a mechanical interlock assembly with locator and contactors, according to one embodiment of the present invention.
The present invention describes a mutual locking device or interlocks for use in conjunction with two electromagnetic contactors to prevent the contactors from being actuated simultaneously. The arrangement is such that only one of the contactor is turned on even when an input signal is applied to both of the contactors.
The present invention solves the problem occurring in providing mutual locking device for electromagnetic contactors. The invention is capable of interlocking the contactors without any additional circuitry. It provides compact interlocking for the contactors and also it offers easy assembly. This mechanical interlock holds the contactor firmly in such a way that it is subjected to minimum wear in operation. This in turn results in increasing the mechanical life of the contactors and interlocking kit.
ADVANTAGES
1. Interlocking the contactors without any additional circuitry
2. Increasing the mechanical life of the contactors and interlocking kit
3. Easy assembly.

Although the embodiments herein are described with various specific embodiments, it will be obvious for a person skilled in the art to practice the embodiments herein with modifications. However, all such modifications are deemed to be within the scope of the claims.
It is also to be understood that the following claims are intended to cover all of the generic and specific features of the embodiments described herein and all the statements of the scope of the embodiments which as a matter of language might be said to fall there between.

WE CLAIM:
1. An improved mechanical interlocking assembly providing interlocking of
electromagnetic contactors thereby preventing simultaneous actuation, said
assembly comprising:
a mechanical interlock means sandwiched between a pair of said electromagnetic contactors; and
a pair of locators holding said mechanical interlock means.
2. Assembly as claimed in claim 1 wherein said mechanical interlock means is adapted to operate only one of said electromagnetic contactors when input signal applied to pair of said electromagnetic contactors.
3. Assembly as claimed in claim 1 wherein said locators adapted to support said mechanical interlock means.
4. Assembly as claimed in claim 1 wherein said mechanical interlock means adapted to hold said electromagnetic contactors providing minimum wear and tear.
5. An improved mechanical interlocking assembly providing interlocking of electromagnetic contactors thereby preventing simultaneous actuation as herein described and illustrated with reference to the accompanying drawings.