FORM 2
THE PATENTS ACT, 1970
(39 of 1970)
As amended by the Patents (Amendment) Act, 2005
AND
The Patents Rules, 2003
As amended by the Patents (Amendment) Rules, 2005
COMPLETE SPECIFICATION
(See section 10 and rule 13)
TITLE OF THE INVENTION
HANDLING MECHANISM FOR CONICAL FIXTURES
APPLICANTS :
Crompton Greaves Limited, CG House, Dr Annie Besant Road, Worli, Mumbai 400 030, Maharashtra, India, an Indian Company
INVENTOR (S):
Shinde Prakash Tukaram and Kulkarni Jayant Kashinath; both of Crompton Greaves Ltd , S1 - Engineering Department, Switchgear Complex, Ambad, Nasik-422010, Maharashtra, India; both Indian Nationals.
PREAMBLE TO THE DESCRIPTION:
The following specification particularly describes the nature of this invention and the manner in which it is to be performed:

Field of the Invention:
This invention relates to the field of hoisting and lifting mechanisms.
This invention also relates to transformer and its components, thereof. Particularly, this invention relates to handling mechanism for conical fixtures.
Background of the Invention:
A transformer consists of many components. One such component is a condenser bushing. A condenser bushing is an insulation made up of alternate layers of insulating material and metal foil placed between the conductor and outer casing in terminals of transformers and other high-voltage equipment such as switchgears.
Typically, these condenser bushings are porcelain bushings. They are preferably kept vertical in a trolley before installation. These condenser bushings are substantially conical in shape.
In a typical assembly of 420 kV Condenser Bushing components, the condenser bushings are heavy and need to be transported and hoisted by means of assist devices such as trolleys, cranes, and the like.
According to the prior art, the following steps are taken in order to hoist the porcelain bushing:

1. Rest the porcelain on ground in a horizontal or tilted position; supported manually;
2. Lift the Fixture rod and insert manually inside the porcelain;
3. Rest fixture plate on porcelain face;
4. Apply and tighten fixing nut manually by holding the whole assembly by two persons using hand tools like spanners;
5. Engage crane hook to the loop of the whole assembly and lift / shift / lower the porcelain for assembly desired location;
6. Set in desired position for assembly;
7. Hold and support manually and unscrew the clamping nut;
8. After dismantling the nut, keep aside and remove the fixture rod manually from the porcelain; and
9. Place porcelain in location / position and do assembly with mating part.
There are a lot of disadvantages with the steps mentioned above. It is a cumbersome operation and is unsafe for handling. It involves a plurality of workers for the operation. This results in more operation time. There is a possibility of accidents and hence property damage (and loss of man hours, thereby). Manual dexterity, skill, and effort required is more.
Prior Art:
JP4014710A describes a method in which ropes are tied to either ends of the bushing with the help of a lifting hook. Length of the ropes is adjusted to maintain the line of centre of gravity (G) in a vertical position, thus reducing the tension in the ropes. This is still a cumbersome and effort based procedure.

US7674122 describes lifting tabs which are removable attached to the bushing. Lifting tabs are fastened to the lifting means which assist in lifting and positioning the assembly especially for higher kilovolt applications. Man power and skill is needed to lift and position the bushing.
US 1846038 describes a rectangular rigid framework for lifting containers.
Objects of the Invention:
An object of the invention is to provide an easier handling mechanism for condenser bushings.
Another object of the invention is to provide a safe handling mechanism for condenser bushings.
Yet another object of the invention is to provide a handling mechanism for condenser bushings which requires relatively lesser manual dexterity.
Still another object of the invention is to provide a handling mechanism for condenser bushings which requires relatively lesser manual effort.
Summary of the Invention:
According to this invention, there is provided a handling mechanism for conical
fixtures, said mechanism comprises:
- rectangular frame with an open operative bottom side and a semicircular frame, with protruding ends, fitted axially at said operative bottom side of said rectangular frame, said mechanism adapted to receive a conical fixture

through the semicircular frame until the point wherein the external diameter of the conical fixture matches with the internal diameter of the semicircular frame with protruding ends, and wherein the protruding ends ensure that the conical fixture does not slide through or topple over, thereby providing a grasp over the fixture.
Typically, said mechanism includes a lifting eye for lifting said handling mechanism and thereby lifting said grasped conical fixture.
Brief Description of the Accompanying Drawings:
Figure 1 illustrates a handling mechanism for a condenser bushing, fitted in the condenser bushing, for providing support for lifting and handling, according to the prior art;
Figure 2 illustrates an isometric view of the handling mechanism of the prior art; and
Figure 3 illustrates a front view of the handling mechanism of the prior art.
The invention will now be described in relation to the accompanying drawings, in which:
Figure 4 illustrates a handling mechanism for the condenser bushing with the condenser bushing fitted in the handling mechanism;
Figure 5 illustrates an isometric view of the handling mechanism;

Figure 6 illustrates a front view of the handling mechanism; and Figure 7 illustrates a top view of the handling mechanism.
Detailed Description of the Accompanying Drawings:
Figure 1 illustrates a handling mechanism for a condenser bushing, fitted in the condenser bushing, for providing support for lifting and handling, according to the prior art;
Figure 2 illustrates an isometric view of the handling mechanism of the prior art; and
Figure 3 illustrates a front view of the handling mechanism of the prior art.
This handling mechanism includes a circular disc (24) fitted with an axial rod
element (22). The handling mechanism is slid with the conical condenser bushing.
The outer diameter of the circular disc fits within the inner diameter of the condenser bushing. A clamping nut (28) at the operative bottom clamps the handling mechanism in the condenser bushing in a tight fit. The lifting eye (26) provides for entry of a hook of the hoisting mechanism to lift the handling mechanism, and thereby handles / lifts the condenser bushing. This entire procedure is a cumbersome task.

According to this invention, there is provided a handling mechanism for conical
fixtures.
Figure 4 illustrates a handling mechanism for the condenser bushing with the
condenser bushing fitted in the handling mechanism;
Figure 5 illustrates an isometric view of the handling mechanism;
Figure 6 illustrates a front view of the handling mechanism; and
Figure 7 illustrates a top view of the handling mechanism.
In accordance with an embodiment of this invention, there is provided a rectangular frame (32) with an open operative bottom side and a semicircular frame (34) with protruding ends (36) fitted axially at said operative bottom side of said rectangular frame. The conical fixture (condenser bushing) (10) slides through the semicircular frame until the point wherein the external diameter of the conical fixture matches with the internal diameter of the semicircular frame with protruding ends. The protruding ends ensure that the conical fixture doesn't slide through or topple over.
In accordance with another embodiment of this invention, there is provided a lifting eye (38) for lifting said handling mechanism (30) and thereby lifting said grasped conical fixture (10).
This handling mechanism is thus a self locating, fast and time saving mechanism by and eliminates operations of the prior art relating to fixture engaging and fixing,

lifting, handling, shifting and positioning for assembly. Also, rod insertion and Nut clamping operation is eliminated thereby saving operation time.
The technical advancement results in time saving, safety, manpower saving, de-skilling of the operation, space saving, and provides a clean and simple operation.
While this detailed description has disclosed certain specific embodiments of the present invention for illustrative purposes, various modifications will be apparent to those skilled in the art which do not constitute departures from the spirit and scope of the invention as defined in the following claims, and it is to be distinctly understood that the foregoing descriptive matter is to be interpreted merely as illustrative of the invention and not as a limitation.

We claim,
1. A handling mechanism for conical fixtures, said mechanism comprising:
- rectangular frame with an open operative bottom side and a semicircular frame, with protruding ends, fitted axially at said operative bottom side of said rectangular frame, said mechanism adapted to receive a conical fixture through the semicircular frame until the point wherein the external diameter of the conical fixture matches with the internal diameter of the semicircular frame with protruding ends, and wherein the protruding ends ensure that the conical fixture does not slide through or topple over, thereby providing a grasp over the fixture.
2. A mechanism as claimed in claim 1 wherein, said mechanism includes a lifting eye for lifting said handling mechanism and thereby lifting said grasped conical fixture.