Description:
TECHNICAL FIELD OF THE INVENTION
The present invention relates to rotary operated mechanism of a circuit breaker, more particularly to a fool proof mounting safety feature for rotary operated mechanism of a circuit breaker.

BACKGROUND OF THE INVENTION
Rotary operated mechanism (also refereed as “ROM”) is used as an external accessory to a circuit breaker. It is mainly used to operate the molded case circuit breaker (MCCB) with a rotary handle and has four states, ON, TRIP, OFF and RESET. ROM is majorly of two types, Direct and Extended.
Prior art patent to refer:
US5493083 details a rotary control device for a circuit breaker having a front plate having an opening through which a crank pin extends, the crank pin being pivotal between first and second positions, the rotary control device including a housing and a rotary handle mounted on the housing, the rotary handle being rotatable between first and second positions corresponding to the first and second positions of the crank pin. A coupling mechanism is provided for mechanically coupling the rotary handle to the crank pin when the housing is mounted on the front plate of the circuit breaker, the connecting device preventing mounting of the rotary control device on the circuit breaker when the rotary handle and the crank pin are not in the same position, that is, are not both in the first position or both in the second position. The first and second positions may correspond to open and closed positions of the circuit breaker.

KR100597973B1 relates to a safety device for a circuit breaker, and more particularly, to prevent a safety accident that may occur in a live state during installation and removal of a plug-in type circuit breaker. It relates to a safety device that can restrain the mechanism of the circuit breaker as a safety device.

The existing ROM design permits mounting on the circuit breaker without mandating alignment between the MCCB knob and the ROM rack, necessitating an improved design that ensures alignment for a safer operation.
Hence there is a need for a system to be developed which is free from the above mentioned issues. The present invention addresses the existing problem of misalignment between the MCCB knob and ROM rack during mounting, leading to potential damage to the operating components by providing a method for mounting rotary operated mechanism of a circuit breaker.

OBJECT OF THE INVENTION
It is an object of the present invention to overcome the shortcomings of the prior art.
It is an object of the present invention to providea method for mounting rotary operated mechanism of a circuit breaker.
Yet another object of the invention is to provide a method that ensures a rotary operated mechanism (ROM) is correctly mounted on a circuit breaker to prevent damage and ensure safe operation of the circuit breaker.
Yet another object of the invention is to provide a reliable and efficient solution to the problem of misalignment during mounting, improving the overall safety and performance of circuit breaker installations.
Still another object of the invention is to ensure alignment of rack of ROM and knob of MCCB by adjusting the mounting links according to the linear travel of the rack which blocks the entry of knob in any undesired position.

SUMMARY OF THE INVENTION
The following disclosure presents a simplified summary of the invention in order to provide a basic understanding of some aspects of the invention. This summary is not an extensive overview of the present invention. It is not intended to identify the key/critical elements of the invention or to delineate the scope of the invention. Its sole purpose is to present some concept of the invention in a simplified form as a prelude to a more detailed description of the invention presented later.
In one aspect of the present invention there is provided a method for mountingsafety featurefor rotary operated mechanism (ROM) of a circuit breaker system, the circuit breaker system comprising: a rack (1); a MCCB knob; an internal gear (2); two pinions (3); a spur gear (4); a rotary operated handle (5); compression springs (6) configured to maintain the default position as OFF in ROM; and mounting links (7, 8) configured to block the MCCB knob from entering the ROM; the method comprising:
blocking by mounting links (7, 8), wherein MCCB is in ON state and ROM is in OFF position;
guiding the MCCB knob through the rack (1), wherein MCCB is in OFF state and ROM is in OFF position;
adjusting by the mounting links (7, 8) according to the linear travel of the rack (1) to ensure the alignment of the rack (1) of ROM and knob of MCCB; and
blocking by mounting links (7, 8) on the other side of the rack, wherein MCCB is in TRIP state and ROM is in OFF position.
In another aspect of the present invention there is provided a mounting safety feature for rotary operated mechanism (ROM) of a circuit breaker system comprising: a rack (1); a MCCB knob; an internal gear (2); two pinions (3); a spur gear (4); a rotary operated handle (5); compression springs (6) configured to maintain the default position as OFF in ROM; mounting links (7, 8) configured to block the MCCB knob from entering the ROM; mounting pins (9,10); and a gear plate (11); wherein the mounting link 1 (7) is fixed on the gear plate(11) with mounting pin1 (9) and mounting pin 2 (10) is fixed on the mounting link 1;
the method comprising:
blocking by mounting links (7, 8), wherein MCCB is in ON state and ROM is in OFF position;
guiding the MCCB knob through the rack (1), wherein MCCB is in OFF state and ROM is in OFF position;
adjusting by the mounting links (7, 8) according to the linear travel of the rack (1) to ensure the alignment of the rack (1) of ROM and knob of MCCB; and
blocking by mounting links (7, 8) on the other side of the rack, wherein MCCB is in TRIP state and ROM is in OFF position.
Other aspects, advantages, and salient features of the invention will become apparent to those skilled in the art from the following detailed description, which, taken in conjunction with the annexed drawings, discloses exemplary embodiments of the invention.

BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
The above and other aspects, features and advantages of the embodiments of the present disclosure will be more apparent in the following description taken in conjunction with the accompanying drawings, in which:
Figure 1 (a) depicts a schematic construction of rotary operated mechanism of a method for mounting rotary operated mechanism of a circuit breaker system in accordance with an embodiment of the present invention.
Figure 1 (b) depicts a sectional view of construction ofrotary operated mechanismof amethod for mounting rotary operated mechanism of a circuit breaker system in accordance with an embodiment of the present invention.
Figure 2 depicts positions of rotary operated mechanism with mounting linksof a method for mounting rotary operated mechanism of a circuit breaker systemin accordance with an embodiment of the present invention.
Figure 2 (a) shows rotary operated mechanism with ON state.
Figure 2 (b) shows rotary operated mechanism with TRIP state.
Figure 2 (c) shows rotary operated mechanism with OFF state.
Figure 3 depicts mounting of the ROM with OFF state on the MCCB state ON and ROM position of a method for mounting rotary operated mechanism of a circuit breaker system in accordance with an embodiment of the present invention.
Figure 4 depicts mounting of the ROM with OFF state on the MCCB state OFF and ROM position of a method for mounting rotary operated mechanism of a circuit breaker system in accordance with an embodiment of the present invention.
Figure 5 depicts mounting of the ROM with OFF state on the MCCB state TRIP and ROM position of a method for mounting rotary operated mechanism of a circuit breaker system in accordance with an embodiment of the present invention.
Persons skilled in the art will appreciate that elements in the figures are illustrated for simplicity and clarity and may not have been drawn to scale. For example, the dimensions of some of the elements in the figure may be exaggerated relative to other elements to help to improve understanding of various exemplary embodiments of the present disclosure. Throughout the drawings, it should be noted that like reference numbers are used to depict the same or similar elements, features, and structures.

DETAILED DESCRIPTION OF THE PRESENT INVENTION
The following description with reference to the accompanying drawings is provided to assist in a comprehensive understanding of various embodiments of the present disclosure as defined by the claims and their equivalents. It includes various specific details to assist in that understanding, but these are to be regarded as merely exemplary. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the various embodiments described herein can be made without departing from the scope and spirit of the present disclosure. In addition, descriptions of well-known functions and constructions may be omitted for clarity and conciseness.
All terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which various embodiments belong. Further, the meaning of terms or words used in the specification and the claims should not be limited to the literal or commonly employed sense but should be construed in accordance with the spirit of the disclosure to most properly describe the present disclosure.
The terminology used herein is for the purpose of describing particular various embodiments only and is not intended to be limiting of various embodiments. As used herein, the singular forms "a," "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising" used herein specify the presence of stated features, integers, steps, operations, members, components, and/or groups thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, members, components, and/or groups thereof.
The present disclosure will now be described more fully with reference to the accompanying drawings, in which various embodiments of the present disclosure are shown.
In one embodiment present invention describes a method for mountingsafety featurefor rotary operated mechanism (ROM) of a circuit breaker system, the circuit breaker system comprising: a rack (1); a MCCB knob; an internal gear (2); two pinions (3); a spur gear (4); a rotary operated handle (5); compression springs (6) configured to maintain the default position as OFF in ROM; and mounting links (7, 8) configured to block the MCCB knob from entering the ROM; the method comprising:
blocking by mounting links (7, 8), wherein MCCB is in ON state and ROM is in OFF position;
guiding the MCCB knob through the rack (1), wherein MCCB is in OFF state and ROM is in OFF position;
adjusting by the mounting links (7, 8) according to the linear travel of the rack (1) to ensure the alignment of the rack (1) of ROM and knob of MCCB; and
blocking by mounting links (7, 8) on the other side of the rack, wherein MCCB is in TRIP state and ROM is in OFF position.
According to one implementation of the present invention, a mounting safety feature for rotary operated mechanism (ROM) of a circuit breaker system comprising: a rack (1); a MCCB knob; an internal gear (2); two pinions (3); a spur gear (4); a rotary operated handle (5); compression springs (6) configure to maintain the default position as OFF in ROM; mounting links (7, 8) configure to block the MCCB knob from entering the ROM; mounting pins (9,10); and a gear plate(11);wherein the mounting link 1 (7) is fixed on the gear plate(11) with mounting pin1 (9) and mounting pin 2 (10) is fixed on the mounting link 1;
the method comprising:
blocking by mounting links (7, 8), wherein MCCB is in ON state and ROM is in OFF position;
guiding the MCCB knob through the rack (1), wherein MCCB is in OFF state and ROM is in OFF position;
adjusting by the mounting links (7, 8) according to the linear travel of the rack (1) to ensure the alignment of the rack (1) of ROM and knob of MCCB; and
blocking by mounting links (7, 8) on the other side of the rack, wherein MCCB is in TRIP state and ROM is in OFF position.
The present invention provides a method for mounting safety feature for a rotary operated mechanism (ROM) of a circuit breaker system. The linear motion of MCCB knob is operated by a rotary handle basically with the help of rack and pinion mechanism. ROM consists of a rack, 2 pinions, a spur gear which drives the pinions and an internal gear. The rotation of the rotary operated handle rotates the internal gear which is coupled with a spur gear which drives the pinions. The rotary motion of the pinion drives the rack linearly. MCCB knob moves along with the rack through the slot provided in rack. In case of direct ROM, the main mechanism along with rotary operated handle is directly mounted on the circuit breaker. In the case of extended ROM, the main mechanism is mounted on the circuit breaker and an extended shaft is connected to the mechanism which couples the rotary operated handle along with it. The extended ROM enables operation of the circuit breaker from outside the panel door. MCCB being the governing element, with preset boundary conditions and constraints, ROM must perform primary, secondary, and tertiary functions in a determined manner.
The method designed to prevent wrong mounting of ROM on MCCB is the unique feature of the present invention. The mounting links adjusts according to the linear travel of the rack to blocks the entry of knob in any undesired position thus ensuring alignment of rack of ROM and knob of MCCB.
Table 1 shows the components involved in the invention.
S.No. Component Name
1 Rack
2 Internal gear
3 Pinions
4 Spur gear
5 Rotary operated handle
6 Compression springs
7 Mounting link 1
8 Mounting link 2
9 Mounting pin 1
10 Mounting pin 2
11 Gear plate
Table 1

An aspect of the present disclosure pertains to a safety feature for fool proof mounting of rotary operated mechanism on circuit breaker. Rotary operated mechanism consists of a rack (1), two pinions (3), a spur gear (4), an internal gear (2), a rotary operated handle (5) and compression springs (6) that maintain the default position as OFF in ROM. The rotation of the internal gear is caused by the rotation of rotary operated handle, which drives the pinions, which then drives the rack through which the MCCB knob is guided. Misalignment of the MCCB knob and ROM rack during mounting might cause damage to the operating components. A safety feature that prevents wrong mounting of ROM on MCCB is detailed in the description.
As shown in figure 1 (a)&(b), mounting links 1 & 2 work on cam and follower mechanism. Mounting link 1 (7) is fixed on the gear plate (11) with mounting pin1 (9). Mounting pin 2 (10) is fixed on the mounting link1 which acts as a cam. The slot in mounting link2 (8) acts as the follower. Similar arrangement is done on the both sides of the rack.
Figure 2 shows all three states of ROM.
The table 2 given below shows the desired mounting conditions out of all the possible combinations of ROM’s default positions and MCCB positions while mounting.

S.No. MCCB State ROM Position Desired condition
1 ON OFF X
2 OFF OFF ✔
3 TRIP OFF X
Table 2
As shown in fig 3 & 5, When ROM’s rack and MCCB knob are not aligned, the mounting links blocks the entry of MCCB knob inside the ROM. Rotary operated mechanism can be mounted on circuit breaker only when the MCCB knob and ROM are both in same state (as shown in fig 4). In all the other conditions MCCB knob will be blocked by the mounting links.

Novel and inventive features:
The present invention provides a fool proof mounting of rotary operated mechanism on circuit breaker as per MCCB contact state.
1. When MCCB is in ON state and ROM is in OFF position, the entry of MCCB knob is blocked by the mounting links.
2. When MCCB is in OFF state and ROM is in OFF position, ROM can be properly mounted on the circuit breaker without any obstruction as MCCB knob gets guided through the rack.
3. When MCCB is in TRIP state and ROM is in OFF position, the mounting links on the other side of the rack blocks the entry of MCCB knob, thus preventing wrong mounting of ROM on circuit breaker.

The following advantage can be list out from the present invention:
1. Enhanced safety: By ensuring proper alignment between the MCCB knob and the ROM rack, the invention prevents damage to the operating components that could occur due to misalignment during mounting.
2. Improved reliability: The use of the cam and follower mechanism in the mounting links ensures that the MCCB knob is guided correctly into the ROM, reducing the risk of incorrect mounting and potential operational issues.
3. Simplified installation: The method provides a straightforward process for mounting the ROM on the circuit breaker, reducing the likelihood of errors during installation.
4. Cost-effectiveness: By preventing damage to the operating components and reducing the need for rework or repairs, the invention can lead to cost savings in maintenance and replacement.
5. Versatility: The invention can be adapted for use in various types of circuit breaker systems, making it a versatile solution for improving safety and efficiency.
, Claims:1. A method for mounting safety feature for rotary operated mechanism (ROM) of a circuit breaker system, the circuit breaker system comprising a rack (1); a MCCB knob; an internal gear (2); two pinions (3); a spur gear (4); a rotary operated handle (5); compression springs (6) configured to maintain the default position as OFF in ROM; and mounting links (7, 8) configured to block the MCCB knob from entering the ROM, the method comprising:
blocking by mounting links (7, 8), wherein MCCB is in ON state and ROM is in OFF position;
guiding the MCCB knob through the rack (1), wherein MCCB is in OFF state and ROM is in OFF position;
adjusting by the mounting links (7, 8) according to the linear travel of the rack (1) to ensure the alignment of the rack (1) of ROM and knob of MCCB; and
blocking by mounting links (7, 8) on the other side of the rack, wherein MCCB is in TRIP state and ROM is in OFF position.

2. The method as claimed in claim 1 wherein the mounting links (7, 8) are configured to operate on a cam and follower mechanism.

3. The method as claimed in claim 2 wherein the mounting link 1 (7) acts as the cam and mounting link 2 (8) acts as the follower.

4. A mounting safety feature for rotary operated mechanism (ROM) of a circuit breaker system comprising:
a rack (1);
a MCCB knob;
an internal gear (2);
two pinions (3);
a spur gear (4);
a rotary operated handle (5);
compression springs (6) configured to maintain the default position as OFF in ROM;
mounting links (7, 8) configured to block the MCCB knob from entering the ROM;
mounting pins (9,10); and
a gear plate (11);
wherein the mounting link 1 (7) is fixed on the gear plate (11) with mounting pin1 (9) and mounting pin 2 (10) is fixed on the mounting link 1.

5. The system as claimed in claim 4 is configured to perform the method as claimed in claim 1.