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, 2006
PROVISIONAL SPECIFICATION
(See section 10 and rule 13)
TITLE OF THE INVENTION
A clutch plate assembly
APPLICANTS
Crompton Greaves Limited, CG House, Dr Annie Besant Road, Worli, Mumbai 400030, Maharashtra. India, an Indian Company
INVENTOR
Mehta Tejas Jitendra of Crompton Greaves Limited, Stamping Division, Crompton Greaves, Kanjurmarg (East), Mumbai 400 042, Maharashtra, India, an Indian National
PREAMBLE TO THE DESCRIPTION
The following specification describes the invention

The present invention relates to a clutch plate assembly and more particularly towards a clutch plate assembly in a press machine.
A drive system of a press machine comprises of a motor and a fly wheel assembly. A V-belt transmits mechanical power from the motor to the fly wheel assembly. The flywheel assembly is mounted on a back shaft with bearings at one end. A clutch assembly is mounted on the back shaft facing the flywheel for transferring the drive and torque from flywheel to back shaft. The other end of the back shaft carrying a pinion gear is mounted on bearings. The pinion gear is connected to a bull gear mounted on a main eccentric shaft which strokes/moves the top assembly of the press tool. A clutch plate of the clutch assembly is bolted to the fly-wheel through a plurality of hexagonal bolts. Due to high torque generated in the flywheel at the time of clutch plate assembly being engaged therewith and in motion, the clutch plate holes are worned out leading to an uneven load sharing by each hexagonal bolt. Consequently, such an uneven load sharing on the bolts damages the bushes and the bolts which eventually leads to the bending or breakage of the clutch plates. Even if the damage to the bushes is diagnosed before the breakage of the clutch plate or the bolts, PCD (pitch circle diameter) adjustment of the clutch plate with reference to the hexagonal bolts on fly-wheel thereafter is very difficult. Also assembling and disassembling of clutch plates is a cumbersome job.
An object of the invention is to provide a clutch plate with brackets.
An object of the invention is to provide a clutch plate with brackets having an additional projected area which shares torque along with the clutch plate.


An object of the invention is to provide a clutch plate which is engaged to the flywheel by means of only two pins.
Another object of the invention is to provide a clutch plate assembly which is easy to assemble and dismantle the whole clutch plate assembly.
According to the invention, a clutch plate assembly comprising of a clutch plate with brackets is provided. The brackets provide an additional projected area for sharing the torque from the fly wheel. Holes are provided on the brackets for mounting the bracket to the clutch plate(s) as well as to the fly wheel. The clutch plate is mounted to the fly wheel through the brackets.
According to an embodiment of the invention, the clutch plate comprises of two semi¬circular structures with holes at its opposite end portions. The two semi circular structures are joined together by means of two clutch brackets to form a circular clutch plate. Each clutch bracket is essentially a triangular structure having a body and two wing type side portions projecting laterally from the body. Holes are provided on each of the winged sides corresponding to the holes provided on the opposite end portions of each semi circular structure. The brackets are bolted to each semi circular structure through by means of hexagonal bolts through the holes. The clutch plate so formed is bolted to a flywheel through the holes provided on the body of each bracket. According to an embodiment of the present mentioned subject matter, in a clutch plate so formed, one hole on the body of one bracket is circular whereas the other hole on the other bracket is square for receiving circular and square pins respectively there through. The semi circular structures are held together through the bracket by means


of twelve bolts, three on each wing of the bracket. The clutch plate so formed is held to the flywheel by means of only 2 pins, a circular and a square pin through the circular and square bushings respectively.
According to the invention, the clutch plate with brackets having an additional projected area increases the load carrying capacity of the clutch plate. Also having only two pins to hold the clutch plate with the flywheel and additional projected area renders extra support to clutch plate, eliminates uneven distribution of the load on the clutch plate, thereby reducing the chances of damages to the bushings, fastening means and eventually to the clutch plate. Hence the life shell of the clutch plate is increased. Also, assembling and disassembling the above clutch plate to/from the clutch plate assembly is simpler and less time consuming.
Although the invention has been described with reference to a specific embodiment, this description is not meant to be construed in a limiting sense. Various modifications of the disclosed embodiment, as well as alternate embodiments of the invention, will become apparent to persons skilled in the art upon reference to the description of the invention. It is therefore contemplated that such modifications can be made without departing from the spirit or scope of the invention as defined.

Dated this 31st day of March 2009
(Ivan Bernard Fuller)
ofKhaitan&Co
Agent for the Applicants