FORM 2
THE PATENTS ACT, 1970
(39 of 1970)
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
Structure for holding weighted objects to be lifted off the ground
APPLICANTS
Crompton Greaves Limited, CG House, Dr Annie Besant Road, Worli, Mumbai 400 030, Maharashtra, India, an Indian Company
INVENTOR
Bhujbai Eknath of Crompton Greaves Ltd, LT Motors Division (M3), A-6/2 MIDC Ahmednagar 414111, Maharashtra, India; an 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:

Field of the Invention:
This invention relates to the field of lifting / loading mechanisms.
Particularly, this invention relates to a structure, for holding weighted objects, to be lifted off the ground.
Background of the Invention:
In the making of wound packs of an Alternator assembly, the partially formed wound packs are lifted and submerged in a VPI tank and baking oven, according to the process of manufacture.
According to the prior art, the structure included a rectangular base frame which was being used. Two numbers of wound packs were adapted to be placed on to this rectangular frame. The length of the rectangular frame was in confirmation with the diameter of the VPI tank. The support shafts required for such a rectangular framed lifting / loading mechanism were 4 in number, each with a hook at its operative top; each at one corner of the mechanism. There is, hence, a cumbersome procedure of attaching each of these shafts to a lifting mechanism so that the structure with load may be uniformly lifted off the ground and then lowered into the VPI tank.
Further, this structure was not a monolithic structure, which resulted in a number of loose parts, resulting in adequate care for its maintenance as well for its lifting and lowering procedure.
It was observed that the wound pack toppling chances are more. And handling of total fixture is critical.

There is need to overcome the limitations of the prior art.
Objects of the Invention:
An object of the invention is to provide a self-balancing structure for mounting weighted objects, typically wound packs, while lifting a plurality of them, and immersing them in a tank.
Another object of the invention is to increase the throughput of baking wound packs.
Yet another object of the invention is to provide an easy-to-lift structure, with weighted objects loaded onto said structure.
Summary of the Invention:
According to this invention, there is provided a self-balancing structure, for holding weighted objects, to be lifted off the ground, said structure comprising a base frame defined in shape to be substantially in co-axial and circumferential conformity with the inner diameter of a circular cross-section tank in which it is to be placed, said base frame adapted to include an axial support shaft having a lifting eye bolt at its operative top end for receiving a hook for hoisting said structure with said weighted objects, and further adapted to include a plurality of strip elements placed at pre-defined locations at the boundary of said base frame and around said axial support shaft to define at least three zones, radially around said shaft, for receiving at

least three corresponding said weighted objects and preventing said received weighted objects from slipping off.
Typically, said structure includes rib elements placed radially around said support shaft adapted to be fitted at the junction of said support shaft with said base frame in order to strengthen the joint of said support shat with said base frame.
Preferably, said frame is a substantially triangular base frame.
Still preferably, said frame is a substantially triangular base frame with clipped apex portions to define a linear edge.
Still preferably, said frame is a substantially hexagonal base frame.
Brief Description of the Accompanying Drawings:
Figure la illustrates a schematic top view of the structure, for holding weighted objects, to be lifted off the ground, in accordance with the prior art;
Figure lb illustrates a schematic front view of the structure of Figure 1 a; and
Figure lc illustrates a schematic side view of the structure of Figure l a.
The invention will now be described in relation to the accompanying drawings, in which:

Figure 2 illustrates a schematic view of a self-balancing structure, for holding weighted objects, to be lifted off the ground;
Figure 3a illustrates a schematic top view of the structure of Figure 2; and
Figure 3b illustrates a schematic front view of the structure of Figure 2.
Detailed Description of the Accompanying Drawings:
Figure la illustrates a schematic top view of the structure, for holding weighted objects, to be lifted off the ground, in accordance with the prior art; Figure l b illustrates a schematic front view of the structure of Figure l a; and Figure l c illustrates a schematic side view of the structure of Figure l a.
Reference numeral 10 refers to a VPI tank with a circular cross-section. Reference numeral 100 refers to a structure of the prior art.
There was provided a substantially rectangular base frame (12) adapted to hold weighted objects such as wound packs of transformers. Due to the size constraints of the VPI tank, and its circular cross-section, two wound packs could be loaded onto the rectangular base frame of the prior art. Further, support shafts (14) were provided at the four corners of the rectangular frame, so that the loaded base frame may be handled or picked up. The operative top end of these support shafts is adapted to be fitted with lifting eye bolts (16) for providing means for receiving hooks so that the structure may be lifted. This construction was not monolithic, in that, it included various loose and fixed parts which destroy the reliability in the longer run.

According to this invention, there is provided a self-balancing structure, for holding weighted objects, to be lifted off the ground.
Figure 2 illustrates a schematic view of the structure (100);
Figure 3a illustrates a schematic top view of the structure of Figure 2; and Figure 3b illustrates a schematic front view of the structure of Figure 2.
In accordance with an embodiment of this invention, there is provided a base frame (20) defined in shape to be substantially in co-axial and circumferential conformity with the inner diameter of a circular cross-section tank (10) in which it is to be placed. According to a preferred embodiment, said frame is a substantially triangular base frame. According to a still preferred embodiment, said frame is a substantially triangular base frame with clipped apex portions to define a linear edge. Typically, said frame is a substantially hexagonal base frame.
In accordance with another embodiment of this invention, there is provided a an axial support shaft (22), protruding from said base frame, said axial shaft having a lifting eye bolt (24) at its operative top end for receiving a hook for hoisting said structure with said weighted objects,
In accordance with yet another embodiment of this invention, there is provided a plurality of strip elements (26) placed at pre-defined locations at the boundary of said base frame and around said axial support shaft to define zones for receiving said weighted objects (30) and preventing said received

weighted objects from slipping off. The defined zones are located with at 120 degrees with respect to each other, with the axial support shaft as the origin, thereby providing 3 zones radially around said shaft to receive 3 corresponding weighted objects (wound packs).
In accordance with still another embodiment of this invention, there are provided rib elements (28) placed radially around said support shaft adapted to be fitted at the junction of said support shaft with said base frame in order to strengthen the joint of said support shat with said base frame.
Due to this invention, the capacity of wound packs adapted to be introduced in said tank increases (by 50%). This increases the throughput of manufacturing wound packs. A single hook is sufficient for lifting the fixture, as the structure is self-balancing. There are no loose parts. Each wound pack is supported at three places, thereby providing a secure mounting and hence, there is no chance for toppling-over of the wound pack. Handling of this fixture with wound pack is easy.

We claim,
1. A self-balancing structure, for holding weighted objects, to be lifted off the ground, said structure comprising a base frame defined in shape to be substantially in co-axial and circumferential conformity with the inner diameter of a circular cross-section tank in which it is to be placed, said base frame adapted to include an axial support shaft having a lifting eye bolt at its operative top end for receiving a hook for hoisting said structure with said weighted objects, and further adapted to include a plurality of strip elements placed at pre-defined locations at the boundary of said base frame and around said axial support shaft to define at least three zones, radially around said shaft, for receiving at least three corresponding said weighted objects and preventing said received weighted objects from slipping off.
2. A structure as claimed in claim 1 wherein, said structure includes rib elements placed radially around said support shaft adapted to be fitted at the junction of said support shaft with said base frame in order to strengthen the joint of said support shat with said base frame.
3. A structure, for holding weighted objects, to be lifted off the ground, said frame is a substantially triangular base frame.
4. A structure, for holding weighted objects, to be lifted off the ground, said frame is a substantially triangular base frame with clipped apex portions to define a linear edge.

5. A structure, for holding weighted objects, to be lifted off the ground, said frame is a substantially hexagonal base frame.