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
A tool and method for lifting armature along with shaft of a motor
APPLICANTS
Crompton Greaves Limited, CG House, Dr Annie Besant Road, Worli, Mumbai 400 030, Maharashtra, India; an Indian Company
INVENTORS
Kadbane Manik Dinkar and Dhamne Karbhari Ganpat of Crompton Greaves Ltd., LT Motors Division, A-6/2, MIDC Industrial Area, Ahmednagar 414 111, 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 mechanical engineering and mechanical assemblies.
Particularly, this invention relates to the field of motors, motor shafts, and armatures and tools and equipment to handle motors, motor shafts, and armatures.
Particularly, this invention relates to a tool and method for lifting armature along with shaft of a motor.
Background of the Invention:
An electric motor converts electrical energy into mechanical energy. Electric motors are found in applications as diverse as industrial fans, blowers and pumps, machine tools, household appliances, power tools, and disk drives. They may be powered by direct current supply, e.g., a battery powered portable device or motor vehicle, or by alternating current supply from a central electrical distribution grid or inverter.
A motor comprises a rotor and stator. The rotor is the rotating assembly. Typically, a rotor shaft extends from the motor. This rotor shaft includes armature. The armature is the power-producing component of the motor. It may be on the rotor (In case of DC Motors) or the stator (In case of Alternator). For the purposes of this specification, the motor includes a rotor with shaft and armature on the shaft.

This shaft along with armature needs to be operativeiy vertically lifted from an operative horizontal position and then fitted into the stator in a concentric manner to complete motor assembly.
The motors, of the prior art, include a shaft with threaded holes, at its end which are used for fixing an eyebolt. This eyebolt is used for lifting the complete armature assembly, along with shaft, for inserting it inside the stator, vertically. The eyebolt fixed to shaft threaded hole is used for lifting purpose.
If the shaft does not have a threading hole, the shaft cannot be effectively lifted without damage to the armature or shaft.
Hence, there is a need for a tool and method for lifting armatures along with shafts of a motor, which shafts do not include threaded holes.
Objects of the Invention:
An object of the invention is to aid the lifting of motor shaft, which-shafts do not have threading for receiving or fixing an eyebolt assembly.
Another object of the invention is to refrain from developing any extra fixture for lifting purpose of motor shaft along with armature, which-motor shaft does not include a threading for receiving or fixing and eyebolt assembly.
Yet another object of the invention is to provide a tool for the lifting of motor shaft, which-shafts do not have threading for receiving or fixing an eyebolt assembly, which tool eases the method and process of lifting.

Still another object of the invention is to provide a method for the lifting of motor shaft, which-shafts do not have threading for receiving or fixing an eyebolt assembly, which method eases the process of lifting.
An additional object of the invention is to aid the lifting of motor shaft, which shafts do not have threading for receiving or fixing an eyebolt assembly, without incurring major additional expenditure.
Yet an additional object of the invention is to aid the lifting of motor shaft, which shafts do not have threading for receiving or fixing an eyebolt assembly using existing components.
Yet an additional object of the invention is to aid the lifting of motor shaft in a safe manner, which-shafts do not have threading for receiving or fixing an eyebolt assembly using existing components.
Summary of the Invention:
According to this invention, there is provided a tool for lifting armature along with shaft of a motor, said tool being a pressing plate, characterised in that, said pressing plate includes an axial hole adapted to slide on the external threads provided on the shaft. The said pressing plate is engaged on the external threads of the shaft with a lock nut.
Typically, said tool includes at least one eyebolt protruding from its operative upper surface in order to facilitate engagement with lifting mechanisms.

Typically, said tool is disc of pre-defined dimensions and weight in order to enable transfer of weight bearing of the shaft and armature while its lifting.
Typically, said tool includes a bolt adapted to bolt and secure said tool onto said shaft.
According to this invention, there is also provided a method for lifting armature along with shaft of a motor, said method comprises the steps of:
a. modifying of a pressing plate to include an axial hole to slide on said shaft;
b. further modifying said pressing plate to include at least one eyebolt
protruding from its operative upper surface in order to facilitate engagement
with lifting mechanisms;
c. placing said modified pressing plate over said shaft in with the help of a lock
nut or bolt; and
d. engaging a lifting mechanism with said eyebolt(s) in order to lift said shaft
and armature.
Brief Description of the Accompanying Drawings:
Figure 1 illustrates a rotor shaft along with armature and an eyebolt fitted atop the rotor shaft according to the prior art.
The invention will now be described in relation to the accompanying drawings, in which:
Figure 2 illustrates a rotor shaft along with armature, which rotor shaft without internal threading;
Figure 3 illustrates a tool for lifting armature along with shaft of a rotor;

Figures 4a and 4b illustrates a method for lifting armature along with shaft of a rotor using the tool of Figure 3.
Detailed Description of the Accompanying Drawings:
Figure 1 illustrates a rotor shaft along with armature and an eyebolt fitted atop the rotor shaft according to the prior art.
A rotor shaft (12), of a motor, includes an armature (14). This rotor shaft along with armature needs to be operatively vertically lifted from an operative horizontal position and then fitted into the stator in a concentric manner to complete motor assembly.
The motors, of the prior art, include a shaft with threaded holes, at its end which are used for fixing an eyebolt (16). This eyebolt is used for lifting the complete armature assembly, along with shaft, for inserting it inside the stator, vertically. The eyebolt fixed to shaft threaded hole is used for lifting purpose.
According to this invention, there is provided a tool and method for lifting armature along with shaft of a motor.
Figure 2 illustrates a rotor shaft along with armature, which rotor shaft is without internal threading hole (26). Hence, an eyebolt assembly (16) (Figure 1) cannot be fitted onto it. This shaft may be a tapered shaft (22). Threading (24) may be provided external to the shaft.
In accordance with an embodiment of this invention, said tool (100) is a modified pressing plate of which the main function is to press the rotor stampings. The

modified pressing plate is adapted to be used with the shaft (22) with armature for lifting the shaft (22).
Figure 3 illustrates the tool (100).
This pressing plate is generally used to press rotor stampings on to the shaft.
The pressing plate includes an axial hole (32) adapted to slide on the external threading (24) of the shaft (22). This tool locks on to the operative top of the shaft with the help of lock nut or bolt (36). The pressing plate, further, includes at least one eyebolt (34) for enabling it to be lifted by means of external lifting mechanisms (42).
A bolt (36) is used to bolt the tool (100) onto the shaft (22) in order to secure this assembly.
Figures 4a and 4b illustrates a method for lifting armature along with shaft of a rotor using the tool of Figure 3.
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 tool for lifting armature along with shaft of a motor, said tool being a pressing plate, characterised in that, said pressing plate includes an axial hole adapted to slide on the external threading of said shaft.
2. A tool as claimed in claim 1 wherein, said tool includes at least one eyebolt protruding from its operative upper surface in order to facilitate engagement with lifting mechanisms.
3. A tool as claimed in claim 1 wherein, said tool is disc of pre-defined dimensions and weight in order to enable transfer of weight bearing of the shaft and armature while its lifting.
4. A tool as claimed in claim 1 wherein, said tool includes a bolt adapted to bolt and secure said tool onto said shaft.
5. A method for lifting armature along with shaft of a motor, said method comprising the steps of:
a. modifying of a pressing plate to include an axial hole to slide on said shaft;
b. further modifying said pressing plate to include at least one eyebolt protruding
from its operative upper surface in order to facilitate engagement with lifting
mechanisms;
c. placing said modified pressing plate over said shaft in with the help of a lock
nut or bolt; and
d. engaging a lifting mechanism with said eyebolt(s) in order to lift said shaft and
armature.