FORM 2

THE PATENTS ACT, 1970

(39 of I970) As amended by the

Patents (Amendment) Act, 2005
&
The Patents Rules, 2003
As amended by the Patents (Amendment) Rules, 2005
COMPLETE SPECIFICATION
(See section 10 and rule 13)
TITLE OF THE INVENTION
Mechanism for Prevention of Rotation of Rod End for Shock Absorber Assembly
APPLICANTS
Crompton Greaves Limited, CG House, Dr Annie Besant Road, Prabhadevi, Mumbai 400 030, Maharashtra, India, an Indian Company
INVENTOR
Saxena Mohit Mohan; S3 Division, Crompton Greaves Limited, Nashik, Maharashtra, India; Indian National
PREAMBLE TO THE DESCRIPTION
The following specification particularly describes the nature of this invention and the manner in which it is to be performed:

TECHNICAL FIELD OF THE INVENTION:
This invention relates to shock absorber assemblies.
More particularly, this invention relates to mechanisms for prevention of rotation of a rod end of a shock absorber assembly during application of torque or under normal operating circumstances of a Gas Circuit Breaker.
BACKGROUND OF THE INVENTION:
A conventional shock absorber is a mechanical device designed to smooth out or damp shock impulse, and dissipate kinetic energy. Pneumatic and hydraulic shock absorbers commonly take the form of a cylinder with a sliding piston inside. The cylinder is filled with a fluid (such as hydraulic fluid) or air. This fluid-filled piston/cylinder combination is a dashpot. One design consideration, when designing or choosing a shock absorber, is where that energy will go. In most dashpots, energy is converted to heat inside the viscous fluid. In hydraulic cylinders, the hydraulic fluid will heat up, while in air cylinders, the hot air is usually exhausted to the atmosphere. In other types of dashpots, such as electromagnetic types, the dissipated energy can be stored and used later.
Shock absorbers are an important part of automobile and motorcycle suspensions, aircraft landing gear, and the supports for many industrial machines. Large shock absorbers have also been used in structural engineering to reduce the susceptibility of structures to earthquake damage and resonance. Many assemblies were made for various functions in lining with the shock absorbers. Mainly shock absorbers consist of a rod, a piston with seals, a cylinder, an oil reservoir, a floating piston, and an air chamber.

However, a basic art of shock absorber assemblies use a mechanical resilient means, capable of compression and decompression, said mechanical resilient means being a spring.
PRIOR ART:
One illustrative example of a spring shock absorber assembly is a spring Gas Circuit Breaker (GCB).
In a 400KV Spring-Spring Gas Circuit Breaker (GCB), a Rod end is provided to the Shock absorber, which rod end connects a piston rod to a PHS30 Universal Joint. In its use, the rod end is subject to application of torque. Typically, this torque may be about 7700 kg-cm. While applying the Torque of 7700kg-cm, the Rod End rotates, in such a manner that it can damage the PHS Universal Joint, & creating problems in alignment of pole to mechanism. Further, during normal GCB operation, the rod end, in the shock absorber assembly of the prior art, rotates, providing an angular displacement from 0° to 15° which causes the same alignment issue.
Moreover, while applying torque, one workman holds the Rod End with a Spanner and another workman applies force in a direction which is opposite. Many a times, the workmen are not able to hold the Rod End with Spanner under such large applications of Torque in an opposite direction, which causes further damage to Rod End, PHS Universal Joint & leads to accident or injury to the workmen.
For the reasons stated above, which will become apparent to those skilled in the art upon reading and understanding the present specification, there is a

need in the art for rotation prevention of rod end of shock absorber during torque application & normal GCB Operation.
OBJECTS OF THE INVENTION:
An object of the invention is to restrict the rotation of the rod end of a shock absorber during torque application & normal GCB operation in the Shock Absorber assembly.
Another object of the invention is to reduce the number of workmen in application of torque of large magnitudes.
Yet another object of the invention is to restrict the rotation of rod end of shock absorber during torque application & normal GCB operation in the Shock Absorber assembly without any help of extra Workmen during Torque Application.
Still another object of the invention is to ensure no accident and injury to the workmen who deal with application of torque to shock absorber assembly.
An additional object of the invention is to decrease the assembly time relating to assemblies which use shock absorber assemblies.
Yet an additional object of the invention is to provide a shock absorber assembly using which an associated assembly process becomes simple.

Still an additional object of the invention is to provide a shock absorber assembly which does not affect the desired results of application.
SUMMARY OF THE INVENTION:
According to this invention, there is provided a shock absorber assembly with a resilient means, a base plate to support said resilient means, a top plate to cover said resilient means, adapted to provide an increased grip and improved fit, said shock absorber assembly comprises:
- resilient means having an operative top end and an operative bottom end adapted to provide resilience to said shock absorbing assembly;
- base plate adapted to support said resilient means at its operative bottom end, said base plate having a locating means to locate a bar pin at the mouth of said bottom end of said resilient means in order to fix the location of said resilient means with respect to said bottom plate;
- top plate adapted to support said resilient means at its operative top end, said top plate having a locating means to locate a bar pin at the mouth of said top end of said resilient means in order to fix the location of said resilient means with respect to said top plate;
- rod receiving means adapted to sit atop said top plate in a groove located on said top plate such that a portion of the external walls of
. said rod end align firmly with the interior walls of said groove, to from a snug-fit assembly.
Typically, said resilient means is a helical coil.
Typically, said locating means on said bottom plate is a hole located on said bottom plate.

Typically, said locating means on said top plate is a hole located on said top plate.
Typically, said base plate is a spring adjuster means.
Typically, said resilient means is a trip spring
Alternatively, said top plate is a trip spring shoe.
Typically, said rod receiving means is a rod end.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS:
Figure 1 shows a conventional shock absorber assembly, according to the prior art.
The invention will now be disclosed in relation to the accompanying drawings, in which:
Figure 2 shows a shock absorber assembly with a groove according to one embodiment of the invention;
Figures 3(a) and 3(b) show a shock absorber assembly with a bar pin according to another embodiment of the invention;
Figure 4 illustrates a cross sectional view of the shock absorber assembly;

Figure 5a illustrates a bottom view of top plate (with a longitudinal groove) of the shock absorber assembly and Figure 5b illustrates a top view (with a longitudinal groove) of top plate of the shock absorber assembly;
Figure 6a illustrates a bottom view of top plate (with a square groove) of the shock absorber assembly and Figure 6b illustrates a top view (with a square groove) of top plate of the shock absorber assembly;
Figure 7 illustrates a rod receiving means adapted to be fitted onto the top plate (with a square groove) of Figures 6a and 6b; and
Figure 8 illustrates a shock absorber assembly in two views with bar pin in locating means, and rod receiving means in groove (longitudinal) of said top plate.
DETAIL DESCRIPTION OF THE ACCOMPANYING DRAWINGS:
In the following detailed description of the preferred embodiments, reference is made to the accompanying drawings that form a part hereof, and in which are shown by way of illustration specific embodiments in which the invention may be practiced. It is understood that other embodiments may be utilized and structural changes may be made without departing from the scope of the present invention.
The leading digit(s) of reference numbers appearing in the Figures generally corresponds to the Figure number in which that component is first introduced, such that the same reference number is used throughout to refer to an identical component which appears in multiple Figures.

The features, structures, or characteristics of the invention described throughout this specification may be combined in any suitable manner in one or more embodiments. For example, reference throughout this specification to "certain embodiments," "some embodiments," or similar language means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. Thus, appearances of the phrases "in certain embodiments," "in demonstrative embodiments," "in some embodiment," "in other embodiments," or similar language throughout this specification do not necessarily all refer to the same group of embodiments and the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
Figure 1 illustrates a conventional shock absorber assembly. This assembly includes a rod receiving means (2), a resilient means (6), a top plate (4) and a base plate (8), placed in a collinear fashion with respect to each of their operative axes. The rod receiving means (2) is seated on top of the top plate (4). The top plate (4) is coupled to the resilient means (6) for upward and downward motions i.e. the compression and decompression, for shock absorbing purposes. The resilient means (6) is placed over the base plate (8) where the base plate (8) bears the resilient means (6). The base plate (8) also provides a platform for support.
Figure 2 shows a shock absorber assembly with a groove according to one embodiment of the invention.

In accordance with an embodiment of this invention, there is provided a groove (10) or a notch, said groove (10) being defined as a recessed slit in the top plate (20) of the shock absorber assembly. A rod receiving means (30) is placed / fitted / seated into this groove (10) such that at least two sides of the base of the rod receiving means (30) align and fit exactly with respect to the walls of the groove (10). Thus, the edges of the groove (10) lend support to the sides of the base of the rod receiving means (30) and hence, to the entire rod receiving means (30). A suitable depth of the groove (10) is given to the top plate (20) for comfortable placement of the rod receiving means (30). The rod receiving means (30) is typically adapted to receive and engage a rod, such that the rod provides force which is transferred onto said rod receiving means (30) and thus the shock absorber assembly (100), said force being a torque (angular) force. Due to this kind of arrangement the rotation force of rod receiving means (30) will transfer to the top plate (20).
Preferably, for a firmer grip, the groove (10) depth may be increased, the thickness of top plate (20) may proportionately increase, the groove (10) may be defined exactly according to the dimensions of the rod receiving means (30) base, snug-fitting it from all sides. Each or a combination of such changes may be incorporated, as the required torque incidence may increase.
Figures 3(a) and 3(b) show a shock absorber assembly with a bar pin according to another embodiment of the invention.
In accordance with another embodiment of this invention, there is provided a first bar pin (40), inserted in said top plate (20), located posterior to said top plate (20) in its operative configuration. Typically, said first bar pin (40) is

located between said top plate (20) and resilient means (50). This first bar pin (40) prevents the rotation of top plate (20), upon application of torque. By placing the bar pin (40) in the shoe at the end point of the resilient means (50), the pin rotational force will be transferred to the resilient means (50)
In accordance with still another embodiment of this invention, there is provided a second bar pin (60) which is inserted on the base plate (70), in an anterior position, at the end point of resilient means (50) to prevent rotation of resilient means (50). The base plate (70) is fixed to the housing (80); all rotations will be prevented through this whole arrangement.
Figure 4 illustrates a cross sectional view of the shock absorber assembly in accordance with this invention.
Figure 5a illustrates a bottom view of top plate (with a longitudinal groove) of the shock absorber assembly and Figure 5b illustrates a top view (with a longitudinal groove) of top plate of the shock absorber assembly in accordance with this invention. Figure 6a illustrates a bottom view of top plate (with a square groove) of the shock absorber assembly and Figure 6b illustrates a top view (with a square groove) of top plate of the shock absorber assembly in accordance with this invention. Figure 7 illustrates a rod receiving means adapted to be fitted onto the top plate (with a square groove) of Figures 6a and 6b. A square groove (10) may provide a firmer grip of the rod receiving means (30) onto the shock absorber assembly (100). For the bar pins (40, 60) to be fitted firmly, locating means (90, 110) [as shown in Figure 8 of the accompanying drawings] are provided on the top

plate (20) and base plate (70) respectively so as to receive the bar pins (40, 60).
Figure 8 illustrates a shock absorber assembly in two views with bar pin in locating means (90, 110), and rod receiving means (30) in groove (longitudinal) (10) of said top plate (20).
Typically, the use of the combination of the groove in the trip spring shoe, and the bar pins, or any part thereof, results in a mechanism so as to work inline with heavy magnitudes of torque, without compromising on rotational capabilities, efficiency, or damage; in turn, reduces the manpower involved in executing related tasks, and also increases reliability and safety.
Particularly, although this invention is applicable to 66 KV Spring-Spring, 145 KV Spring-Spring, 170 KV Spring-Spring, 245 KV Spring-Spring Gas Circuit Breakers and other similar Shock Absorber applications, these mechanisms may be extended to provide the grip and support in similar torque applicable mechanisms and scenarios.
With the above-mentioned arrangement of the present invention, Rod End rotation prevention is possible without any help of extra Workmen during Torque Application and also ensuring no injury to the Workmen. The present invention also achieve the desired results. The above-mentioned arrangement of the present invention is one time and simple in construction,
FIGS. 1-8 are merely representational and are not drawn to scale. Certain portions thereof may be exaggerated, while others may be minimized.

FIGS. 1-8 illustrate various embodiments of the disclosed invention that can be understood and appropriately carried out by those of ordinary skill in the art. The above description is intended to be illustrative, and not restrictive. Many other embodiments will be apparent to those skilled in the art.

We claim,
1. A shock absorber assembly with a resilient means, a base plate to support said resilient means, a top plate to cover said resilient means, adapted to provide an increased grip and improved fit, said shock absorber assembly comprising:
- resilient means having an operative top end and an operative bottom end adapted to provide resilience to said shock absorbing assembly;
- base plate adapted to support said resilient means at its operative bottom end, said base plate having a locating means to locate a bar pin at the mouth of said bottom end of said resilient means in order to fix the location of said resilient means with respect to said bottom plate and to prevent its rotational motion upon exertion of torque;
- top plate adapted to support said resilient means at its operative top end, said top plate having a locating means to locate a bar pin at the mouth of said top end of said resilient means in order to fix the location of said resilient means with respect to said top plate and to prevent its rotational motion upon exertion of torque;
- rod receiving means adapted to sit atop said top plate in a groove located on said top plate such that a portion of the external walls of said rod end align firmly with the interior walls of said groove, to from a snug-fit assembly.
2. An assembly as claimed in claim 1, wherein said resilient means is a helical coil.

3. An assembly as claimed in claim 1, wherein said locating means on said bottom piate is a hole located on said bottom plate.
4. An assembly as claimed in claim 1, wherein said locating means on said top plate is a hole located on said top plate.
5. An assembly as claimed in claim 1, wherein said base plate is a spring adjuster means.
6. An assembly as claimed in claim 1, wherein said resilient means is a trip spring
7. An assembly as claimed in claim 1, wherein said top plate is a trip spring shoe.
8. An assembly as claimed in claim 1, wherein said rod receiving means is a rod end.