FORM 2
THE PATENTS ACT, 1970
(39 of 1970)
&
The Patents Rules, 2003
COMPLETE SPECIFICATION
(See section 10; rule 13)
1. Title of the invention: ROTARY MECHANISM FOR LOW VOLTAGE SWITCHGEAR PRODUCTS
2. Applicant(s):
(a) NAME : LARSEN & TOUBRO LIMITED
(b) NATIONALITY: An Indian Company.
(c) ADDRESS: L & T House, Ballard Estate, Mumbai 400 001.
State of Maharashtra, India
3. PREAMBLE TO THE DESCRIPTION
The following specification particularly describes the invention and the manner in which it is to be performed:

TECHNICAL FIELD OF THE INVENTION
This invention relates generally to a rotary mechanism and more particularly to a rotary mechanism for low voltage switchgear products.
BACKGROUND AND THE PRIOR ART
Conventionally, for switching devices the toggle type mechanisms are being used. It consists of spring loaded operating shaft. It transmits the power from springs to a CAM. CAM provides a manual independent operation of the mechanism. The CAM drives the output shaft which in turns switching ON or OFF the contact system. Here the springs are not directly connected to the output shaft and it is connected through the CAM, which results in loss of force transmitted to the contact system. It means force transmitted to the output shaft is less efficient because of indirect connection of the spring and output shaft.
US 7368676 B discloses a switching device having a frame, in which an actuator adapted to rotate a main shaft of the switching device and rotatable around an axis of rotation, the actuator having a 0 position, an I position and a first dead point between the 0 position and the I position, the I position being located by a given angle (.alpha..sub.6) in a first direction relative to the 0 position. The actuator also has a testing position, the testing position being located by a predetermined angle (.beta..sub.6) in a second direction relative to the 0 position, the second direction being opposite relative to the first direction.
A modular switching device is disclosed in US2007/0063796 which includes a plurality of interconnected modules, the modules having a control device module and a pole cell module, the modules of the switching device being interconnected with a shaft adapted to transfer a torque required for operating the switching device from one module to another module. The modular switching device is

configured such that each module has a shaft element, and the shaft transferring the torque is composed of directly interconnected shaft elements.
US 2008/0035464 Al discloses a switching device is disclosed which includes a working shaft and a control shaft installed in a frame part, the control shaft being rotatable and adapted to turn the working shaft, and the working shaft being adapted to change the position of poles of the switching device. One of the two shafts passes through the other.
US 6960731 B2 discloses a rotating contact supporting shaft for a low-voltage power circuit breaker, whose particularity consists of the fact that it has a modular structure that comprises, along the rotation axis, at least one first and one second supporting module (10, 20), each module being functionally coupled to at least one corresponding moving contact (3) of the circuit breaker and being provided respectively with first and second means (22) for connection to at least one first interconnection module (30); the first interconnection module is interposed between the first and second supporting modules and is provided with third and fourth connection means (31) that are suitable to be coupled respectively to the first and second connection means; the coupling between the first and third connection means and between the second and fourth connection means allows the functional connection between the first and second supporting modules and the direct structural connection of the interconnection module to the first and second supporting modules.
Thus, there is a need to overcome the problems of the prior art. Therefore, the present invention provides a rotary mechanism for use in low voltage switchgear that would eliminate CAM operation and increase the efficiency of the mechanism.

OBJECTS OF THE INVENTION
A basic object of the present invention is to overcome the disadvantages/drawbacks of the known art.
An object of the present invention is to overcome the problems/disadvantages of the prior art.
Another object of the present invention is to provide a rotary mechanism for use in switches used to toggle between different sources.
Another object of the present invention is to provide a single integrated actuating shaft with bevel gears for switches used to toggle between sources.
Another object of the present invention is to cut the single integrated shaft with bevel gears in two halves across the length to use in a switching device.
Another objective of the present invention is to provide manual independency in the horizontal rotor by relaxing the rotation of rotor of the contact system till the mechanism achieves dead center position and after dead center horizontal rotor drives the rotor of the contact system.
These and advantages of the present invention will become readily apparent from the following detailed description taken in conjunction with the accompanying drawings.
SUMMARY OF THE INVENTION
There is provided a rotary mechanism for low voltage switchgear products.

According to one embodiment of the present invention, there is provided A rotary mechanism for low voltage switchgear products, said rotary mechanism comprising duality of modules connected back to back using an integrated actuating shaft; said module having a single mechanism consisting of one vertical input shaft with integral bevel gear; a second bevel gear joined with another coupler through a pin, said pin spring loaded; said spring connected directly to the output shaft providing force to the output shaft directly; and a housing to incorporate said rotary mechanism.
Other embodiment of the present invention provides an actuator to apply torque to said vertical shaft.
Yet other embodiment of the present invention provides bevel gears that facilitate manual independent operation on said output shaft.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
In the appended drawings:
Figure 1 illustrates an overview of mechanism in a switching device
Figure 2 illustrates an overview of mechanism for use in switches used to toggle between different sources.
Figure 3 illustrates an exploded view of mechanism in a switching device.
Figure 4 illustrates a toggle condition for SD-1.
Figure 5 illustrates SD-1 is 'ON' and SD-2 is 'OFF'

Figure 6 illustrates SD-2 in toggle condition.
Figure 7 illustrates SD-1 is 'OFF' and SD-2 is 'ON'
Figure 8 illustrates single integrated shaft
Figure 9 illustrates the Shaft coupling with manual independency.
DETAILED DESCRIPTION OF THE ACCOMPANYING DRAWINGS
The following drawings are illustrative of particular examples for enabling methods of the present invention, are descriptive of some of the methods, and are not intended to limit the scope of the invention. The drawings are not to scale (unless so stated) and are intended for use in conjunction with the explanations in the following detailed description.
Reference is first invited to Fig 1 where the overview of mechanism in a switching device is shown.
Fig. 2 shows the exploded view of the present invention.
Fig. 3 shows the initial condition of the mechanism that means both the switches are is in OFF condition.
Fig. 4 shows the toggle condition for the SD-1 (switching device), when the actuating shaft is rotated clockwise.
Fig. 5 shows the first SD is ON after 90° rotation of the actuating shaft from its original position and second is unchanged.

Fig. 6 shows the toggle condition for the SD-2 (switching device), when the actuating shaft is rotated anticlockwise.
Fig. 7 shows the first SD is ON after 90° rotation of the actuating shaft from its original position and first is unchanged
The invented system is thus a rotary mechanism for low voltage switchgear products.
DETAILED DESCRIPTION OF THE INVENTION
Accordingly in the present invention there is provided a rotary mechanism for use in switches used to toggle between different sources.
The mechanism comprises of two modular mechanism are connected back to back by a single integrated actuating shaft. Single mechanism used for switch device, and multiple stacks are used for toggle switches. The single integrated actuating shaft with bevel gears when cut in the middle across the length is used as a single mechanism.
Single mechanism consists of one vertical input shaft with integral bevel gear (1501). Then second bevel gear (1502) is also an integral coupler which is joined with another coupler simply through a pin (1504). The pins (1504) are spring loaded. The exploded view of the mechanism is showed in Figure 2.
The angle of rotation of the shafts is decided by the gear ratio. The torque is applied to the vertical shaft through an actuator, then the sequence of the operation is shown in following figures.
Fig. 3 shows the initial condition of the mechanism that means both the switches are is in OFF condition. Fig. 4 shows the toggle condition for the SD-1 (switching

device), when the actuating shaft is rotated clockwise. Fig. 5 shows the first SD is ON after 90° rotation of the actuating shaft from its original position and second is unchanged.
Fig. 6 shows the toggle condition for the SD-2 (switching device), when the actuating shaft is rotated anticlockwise. Fig. 7 shows the first SD is ON after 90° rotation of the actuating shaft from its original position and first is unchanged
Constructional components
1501: A integrated Vertical bevel gear with shaft
1502: Horizontal bevel gear (pinion) integrated with a coupler
1503: other side coupler
1504: Pin
1505: Spring guide
1506: Compression Spring
1507: Spring Rest
1508: Left side housing
1509: Right side Housing
In this invention, the CAM operation is eliminated by providing manual independent operation on the output shaft itself and the intersecting shaft power transmission is done by using the partial part bevel gears. Efficiency of the mechanism is higher than any other mechanism, because of two reasons:
1. Use of Bevel gears instead of cam or any link mechanism
2. Direct connection of spring to the output shaft, which provides a force to the output shaft directly.

Advantages:
1. The springs being directly coupled to the driven shaft increases the efficiency of the mechanism. This results into safer design as required spring force becomes much less.
2. Coupler design for manual independency.
3. A partial bevel gear arrangement for engaging and disengaging itself to operate one switch at a time.
4. Only one variety of spring used. This results in a much less complicated design over the prior art.
5. Arranging the spring in a vertical plane results in optimum space utilization.
6. Profile which provides positive single stage coupling as well as two stage coupling.
7. Two stage coupling provides manual independency as well as positive drive after certain angular rotation.
8. Reduces number of varieties; hence less number of components, manufacturing cost and investment.
9. A guide is provided in the form of central protruded taper portion so as to facilitate assembly process. Thus reducing assembly time and effort.
10. Eliminates the need of providing manual independency at mechanism level, reducing complexity at mechanism level. This eliminates additional components in mechanism and transmits torque directly from vertical actuating shaft to horizontal rotor. And also by transmitting energy of the spring directly to the horizontal rotor increases the efficiency, and thus reduces the spring force required. This reduces the stresses in the components and increases reliability.
Although the embodiments herein are described with various specific embodiments, it will be obvious for a person skilled in the art to practice the embodiments herein with modifications. However, all such modifications are deemed to be within the scope of the claims.

It is also to be understood that the following claims are intended to cover all of the generic and specific features of the embodiments described herein and all the statements of the scope of the embodiments which as a matter of language might be said to fall there between,

WE CLAIM:
1. A rotary mechanism for low voltage switchgear products, said rotary
mechanism comprising:
duality of modules connected back to back using an integrated actuating shaft; said module having a single mechanism consisting an input shaft with integral bevel gear whereby said input shaft being substantially vertically aligned; a second bevel gear joined with another coupler through a pin means, said pin means being spring loaded; said spring connected directly to the output shaft providing force to the output shaft directly; and a housing to incorporate said rotary mechanism.
2. Rotary mechanism as claimed in claim 1 wherein said input shaft having angle of rotation corresponding on the gear ratio.
3. Rotary mechanism as claimed in claim 1 further comprising an actuator adapted to apply torque to said vertical shaft.
4. Rotary mechanism as claimed in claim 1 wherein said bevel gears facilitate manual independent operation on said output shaft.
5. Rotary mechanism as claimed in claim 1 wherein said bevel gear arrangement is configured to engage and disengage itself to operate one switch disconnector at a time.

6. Rotary mechanism as claimed in claim 1 wherein said single mechanism is used in a switching device.
7. Rotary mechanism as claimed in claim 1 wherein multiple said single mechanisms is used in toggle switches.
8. Rotary mechanism as claimed in claim 1 wherein said single mechanism is cut from said single integrated actuating with bevel gears cut in middle across the length.
9. A rotary mechanism for low voltage switchgear products as herein substantially described and illustrated with reference to the accompanying drawings.