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
COMPLETE SPECIFICATION (See section 10 and rule 13)
TITLE OF THE INVENTION
An energy storing device
APPLICANTS
Crompton Greaves Limited, CG House, Dr Annie Besant Road, Worli, Mumbai 400 030, Maharashtra, India, an Indian Company
INVENTORS
Teli Kunal, Roy Deosharan, Ahirao Sachin and Mathew Tom Arun of Crompton Greaves Ltd, Global R &D Centre, Analytics Centre, Kanjurmarg (E), Mumbai - 400042, Maharashtra, INDIA and Tambe Sangram of Crompton Greaves Ltd, Switchgear (S3) Division, A-3, M.I.D.C, Ambad, Nashik - 422010, Maharashtra, INDIA, all Indian Nationals
PREAMBLE TO THE DESCRIPTION
The following specification particularly describes the invention and the manner in which it is to be performed:

FIELD OF THE INVENTION
This invention relates to an energy storing device.
BACKGROUND OF THE INVENTION
Generally, the primary function of a circuit breaker mechanism is to provide the means for opening and closing the contacts. Different types of mechanisms are available for different types of circuit breakers, but what is common to all is that they store potential energy in some elastic medium, which is charged from a low power source over a longer period of time. From the energy storage point of view, the mechanisms that are used in today's circuit breakers fall in the spring, pneumatic or hydraulic categories and from the mechanical operation point of view; they are either of the ratchet-pawl mechanism, cam-roller or of the chain driver type. Spring operated mechanisms are preferred for almost all voltage class of circuit breakers due to their simple design and cost advantage over other mechanisms. As implied by its name, the energy of this mechanism is stored in closing springs. The stored energy is available for closing the circuit breaker on command following the release of the closing latch. In its simplest form, the spring mechanism consists of a charging motor and charging ratchet or, a closing cam, closing springs, tripping springs, and a toggle linkage. The charging motor and ratchet assembly facilitate automatic re-charging of the closing springs immediately following the closing operation.
In a peculiar switchgear having spring for the purpose of energy storage, the charged springs are held in position by the closing latch, which prevents the closing cam from rotating. In order to release the spring energy, either an electrically operated solenoid closing coil, or a manual closing lever is operated. Following the activation of the closing solenoid, a closing latch is

released, which facilitates discharging of the charged closing springs thereby causing the rotation of the closing cam, which further transfers its motion to the operating rod directly or through levers and shafts. As the cam rotates, it straightens the toggle linkage, which, in turn, rotates the main shaft thus driving the contacts that are connected to the shaft by means of insulating rods.The straightening of the toggle links loads the trip latch as they go over the centre. The trip latch then holds the circuit breaker in the closed position. In addition to closing the contacts, the closing springs supply enough energy to charge the opening spring. The opening of the contacts can be initiated electrically or manually, however, the manual operation is generally provided only for maintenance purposes. When the tripping command is given, the trip latch is released thus freeing the trip roller carrier. The force produced over the centre toggle linkage or tripping spring bias, rotates the trip roller carrier forward. The tripping springs, which are connected to the main operating shaft, provide the requisite energy to open the contacts of the circuit breaker.
US 6610949 discloses an operating apparatus for a switchgear comprising: an on-off switch driver including a rotatably mounted energizing lever linked to an on-off switch of the switchgear and an energy-storing device linked to the energizing lever; a retaining device including a locking lever; and an energizing mechanism including a cam turned by an electric motor in a specific direction, a current interrupter and a braking device; wherein the cam of said energizing mechanism turning in said specific direction begins to maintain contact with the energizing lever at a first angular position, turns the energizing lever in an energizing direction to energize the energy-storing device, causes the locking lever of said retaining device to lock the energizing lever such that the energizing lever remains in the energized condition without turning opposite to the energizing direction, and becomes separated from the energizing lever by

further turning in said specific direction, the current interrupter is actuated and interrupts an electric current supplied to the electric motor when the cam reaches a second angular position after turning by a first specific angle from the first anguler position, and the braking device brakes the cam when the cam reaches a third angular position after turning by a second specific angle from the second angular position due to inertial turning of the electric motor, whereby the cam stops within a specific angular range of rotation.
US 4573723disclosesa door lock system for an automotive door which includes a door lock driving device for mechanically locking or unlocking a door lock. The door lock can be, however, manually operated with a small force, because the door lock is operatively disconnected from an electric motor of the door lock driving device. The door lock driving device has a reversible electric motor, a sun gear fixed to an output shaft of the electric motor, a pair of swing levers rotatably supported by the output shaft, a planetary gear rotatably supported by the swing levers and engaged with the sun gear, and wave washers interposed between the swing levers and side surfaces of the planetary gear, so that when the electric motor is rotated, the planetary gear is rotated around the output shaft of the electric motor. The door lock driving device further includes a driven gear and a driven shaft which are operatively connected with each other by means of a torsion bar, so that a rotational force of the driven gear is transmitted to the driven shaft by twisting the torsion bar. When the planetary gear is brought into engagement with the drive gear, the rotational force of the electric motor is transmitted to the driven shaft through the sun gear, the planetary gear, the driven gear and the torsion bar. When the rotation of the electric motor is stopped, the driven gear is rotated in a reverse direction by the spring back

action of the torsion bar, so that the planetary gear is brought out of engagement with the driven gear to operatively disconnect the driven shaft from the electric motor.
One of the inherent drawbacks of the existing switchgears of the type described hereinbefore is that the energy storage per unit volume is less. Accordingly, efforts have been made to increase the number of springs, preferably in parallel arrangement, or to interconnect the torsion bars thereby increasing the total stored energy. However, such arrangements have one or the other disadvantages, such as requirement of more space, increase in the inertia of the overall system, requirement of special guidance for springs, apparent difficulty in the parallel arrangement of springs etc. Furthermore, torsion bars connected in series require more amount of angular rotation to store the energy and special connecting mechanism is required to connect two torsion bars.
There has thus been a persistent need to develop an energy storing device that would store more energy and occupies lesser space in the system, particularly switchgear.
OBJECT OF THE INVENTION
The present invention is contrived in consideration of the circumstances mentioned hereinbefore, and is intended to provide an energy storing device by using planetary gear train device.
Another object of the present invention is directed to provide an energy storing device to simultaneously charge multiple torsion bars thereby storing more energy per unit volume.

Yet another object of the present invention is directed to provide an energy storing device thereby reducing the overall weight and dimension of the system.
SUMMARY OF THE INVENTION
The above objects are achieved by providing an energy storing device comprising a planetary gear train comprising a sun gear, plurality of planet gears, a ring gear and an arm wherein said plurality of planet gears are rotatably mounted on said sun gear and connected to each other by said arm;a driving mechanism coupled to said sun gear; a plurality of torsion bars connected to planet gears on one end and to a disc on the other end;and a latch member linked to said driving mechanism; wherein said latch remains in an unlocked position during the operation of said driving mechanism thereby rotating said sun gear in a direction opposite to that of said driving mechanism which in turns rotates said planet gears in a direction opposite to that of said sun gear thereby imparting torque onsaid plurality of torsion bars and storing energy in said torsion bars;said latch remains in a locked position to prohibit dissipation of energy stored in said torsion bars; and said latch when released from the locked position rotates the planet gears thereby releasing the energy stored in said torsion bars.
According to another embodiment of the present invention, an electric motor is provided for rotation of the sun gear.
According to another embodiment of the present invention, the coupling mechanism between said electric motor and sun gear comprises a crank rotatably mounted on shaft of said electric motor and lever disposed between said crank and said sun gear.

These and other objects, features and advantages of the present invention will become more apparent from the detailed description of the invention taken in conjunction with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig 1 of the drawings illustrates the energy storing device according to the present invention when the latch is in unlocked position (Torsion bars in discharged state).
Fig 2 of the drawings illustrates the energy storing device according to the present invention when the latch is in locked position (Torsion bars in charged state),
Fig 3 of the drawings illustrates the energy storing device, particularly the roller for latching, according to the present invention when the latch is in locked position.
DETAILED DESCRIPTION
The invention may be better understood and further advantages and uses thereof more readily apparent when considered in view of the following detailed description of exemplary embodiments, taken with the accompanying drawings. These embodiments describe only a few of the various ways in which the principles of various other embodiments may be realized and the described embodiments are intended to include all such embodiments and their equivalents and the reference numerals used in the accompanying drawings correspond to the like elements throughout the description.

Referring to Figures 1 and 2, an exemplary embodiment of an energy storing device in accordance with the present invention is illustrated which comprises a planetary gear train (4), a driving mechanism (1), a plurality of torsion bars (9) and a latch member (1 l).The planetary gear train (4) comprises a sun gear (5), plurality of planet gears (8), a ring gear (7) and an arm (6). The sun gear (5) is located centrally on the ring gear (7) and the planet gears (8) are rotatably mounted on the sun gear (5). The planet gears (8) are connected to each other by an arm (6) and they rotate upon the rotation of the sun gear (5).The driving mechanism (1), preferably an electric motor, is coupled to sun gear (5) wherein the coupling mechanism between the two comprises a crank and crank plate (2) rotatably mounted on shaft of the electric motor (1), a lever (3) disposed between the crank and crank plate (2) and the sun gear (5). Pluralities of torsion bars for storage of energy are connected to planet gears (8) on one side and to a disc (10) on the other side. The latch member (11) which may be used to lock and unlock the crank (2) is linked to the electric motor.
During charging of the torsion bars (9), the latch remains in an unlocked position and the electric motor is in operation. Latch being in unlocked position, the rotational motion of the shaft of the motor is imparted to the crank and crank plate (2) to rotate freely. The charging of the torsion bars (9) takes place when the electric motor (1) starts rotating, in anticlockwise direction, thereby rotating said sun gear (5) in a direction, in clockwise direction, opposite to that of electric motor (1) which in turns rotates the planet gears (8) in a direction, anticlockwise direction, opposite to that of the sun gear (5) thereby imparting torque on plurality of torsion bars (9). The rotation of the planet gears (8) causes the respective torsion bars (9) to twist around its axis and is resisted

by the bar's torsion resistance. Due to application of torque on the torsion bars (9) by the rotation of the planet gears, energy is stored in the torsion bars (9). During such charging operation, the latch (11) remains in an unlocked position which enables the crank and crank plate (2) and lever (3) mechanism to transfer the rotation of the motor to the sun gear (5).
After completion of charging of the torsion bars (9), motor (I) is powered off and latch (11) gets back to its locked position due to resetting spring (not shown). With that, roller (12) of crank plate gets engaged with latch (11), Due to engagement of roller and latch (11), torsion bars remain at twisted position so energy remains stored in torsion bars. The latch (11), as shown in Figure 3, remains in a locked position to prohibit the dissipation of energy stored in said torsion bars (9).
Whenever energy need to be utilized, trigger (not shown) gets activated which displaces latch (11) at unlocked position and system gets free to release the energy stored in torsion bars. When latch (11) is triggered, in the anticlockwise direction, from the locked position, crank and crank plate (2) is rotated in the same direction, anticlockwise direction, thereby rotating the sun gear (5) in anticlockwise direction and planet gears (8) in an opposite direction, clockwise direction, and releasing the stored energy of the torsion bars (9).The energy stored in the torsion bars (9) may suitably be used for operation of switchgears.
It may be noted that during charging operation energy gets transfer from motor (1) to crank and crank plate (2) and then to sun gear (5). Input is given to sun gear because with lower torque motor high energy can be stored in torsion bars. During discharging operation output is taken

from ring gear (7) because it transfers higher torque to the output shaft which is required for system operation.
The energy storage device according to present invention would permit simultaneous charging of plurality of torsion bars. Consequently, more energy is sorted per unit volume and the overall weight and dimension of the system, such as switchgear, is reduced.
Since other modifications and changes to fit particular requirements and environments will be apparent to those skilled in the art, the invention is not considered limited as described by the present preferred embodiments which have been chosen for purposes of disclosure, and covers all changes and modifications which do not constitute departure from the spirit and scope of this invention.

CLAIMS
We claim:
1. An energy storing device comprising:
a planetary gear train (4) comprising a sun gear (5), plurality of planet gears (8), a ring gear
(7) and an arm (6) wherein said plurality of planet gears (8) are rotatably mounted on said
sun gear (5) and connected to each other by said arm (6);
a driving mechanism (1) coupled to said sun gear (5);
a plurality of torsion bars (9) connected to planet gears (8) on one end and to a disc (10) on
the other end; and
a latch member (11) comprising a roller and linked to said driving mechanism (1); wherein
said latch (11) remains in an unlocked position during the operation of said driving
mechanism (1) thereby rotating said sun gear (5) in a direction opposite to that of said driving
mechanism (1) which in turns rotates said planet gears in a direction opposite to that of said
sun gear (5) thereby imparting torque on said plurality of torsion bars (9) and storing energy
in said torsion bars (9);
said latch (11) remains in a locked position to prohibit dissipation of energy stored in said
torsion bars (9); and
said latch (11) when released from the locked position rotates the planet gears (8) thereby
releasing the energy stored in said torsion bars (9).
2. An energy storing device as claimed in claim 1, wherein said driving mechanism (1)
comprises an electric motor (1).

3. An energy storing device as claimed in claim 1 or 2, wherein said coupling mechanism between said electric motor (1) and sun gear (5) comprises: a crank and crank plate (2) rotatably mounted on shaft of said electric motor (1); and a lever (3) disposed between said crank and crank plate (2) and said sun gear (5).