Claims:1. A mechanism for accommodating a circuit breaker in a plug-in box of a plug-in busbar, said mechanism comprising:
a busbar interlock plate (81) for interlocking the plug-in box with the busbar;
a rotary operating mechanism, ROM, (12) fixed to the circuit breaker, the ROM (12) comprising a rotary operating handle, ROH, (13) and a ROM shaft (41), the rotary operating handle (13) configured to be rotatable in correspondence to the movement of a circuit breaker knob (91);
a clutch rotating shaft pulley (42) connected to the ROM shaft (41);
a pusher frame assembly (3) mounting at least a clutch pusher pulley (32) and pushers (33);
a plunger assembly (7) in communicating with the pusher frame assembly (3), the plunger assembly (7) comprising at least push plunger caps (71), plunger pins (72), and plunger springs (73); and
a clutch wire (5) with one bare end connected to the clutch rotating shaft pulley (42) and another bare end connected to the clutch-pusher pulley (32) to communicate transferrable force from the ROM (12) via the clutch rotating shaft pulley (42) to the clutch-pusher pulley (32);
wherein when the rotation of the ROM shaft (41) is transferred to the pusher assembly (3), the pusher assembly (3) dislocates the plunger pins (72) thereby locking the busbar interlock plate (81).

2. The mechanism as claimed in claim 1 wherein the plunger pins (72) are dislocated from the busbar interlock plate (81) when the circuit breaker knob is switched from ON position to OFF position.

3. The mechanism as claimed in claim 2 wherein the plunger pins (72) are restricted in movement thereby restricting the locking of the busbar interlock plate (81).

4. The mechanism as claimed in claim 3 wherein the bubar interlock plate (81) is released to enable the circuit breaker knob to be switched to the ON position.

5. The mechanism as claimed in claim 1 wherein when the clutch pusher pulley (32) receives mechanical force from the clutch rotating shaft pulley (42) via the clutch wire (5), the pushers (33) are adapted to push the plunger caps (71) and the plunger caps (71) are configured to compress the plunger pin springs (73), and wherein on compression of the plunger pin springs (73), the plunger pins (72) receive compression force of the springs (73) and are received in circular holes provided on the busbar interlock plate (81).

6. The mechanism as claimed in claim 1 wherein said pusher frame assembly (3) has free post riveting rotation using engagement clamps (6) for fastening the pusher frame assembly (3).

7. The mechanism as claimed in claim 1 wherein the ROM (12) is mounted on the circuit breaker knob (91) and one end of the ROM shaft (41) is fixed within a slot provided on the ROM (12).

8. The mechanism as claimed in claim 1 wherein the ROM shaft (41) is inserted in the clutch rotating shaft pulley (42) and fastened using hardware (14).

9. The mechanism as claimed in claim 5 wherein the pushers (33) are fixed on a top surface of a base frame (31) of the pusher frame assembly (3).

10. The mechanism as claimed in claim 1 wherein the clutch wire 5 is clamped with an enclosure wall (21) of the plug-in box such that a rotation of the pusher frame assembly (3) is controlled by the rotation of the ROM shaft (41).

11. The mechanism as claimed in claim 5 wherein when the ROH (13) is rotated corresponding to the change in position from the OFF position to the ON position:
the ROM shaft (41) and correspondingly the clutch rotating shaft pulley (42) are rotated in clockwise direction resulting in the clutch wire (5) being pulled by the clutch wire rotating shaft pulley (42) fixed on the ROM shaft (41); and
the clutch pusher pulley (32), the pusher assembly (3) connected to the other bare end of the clutch wire (5), are rotated in the anti-clockwise direction.

12. The mechanism as claimed in claim 11 wherein when a force transferred to the ROM (12) is sufficient to overcome a force required to change a switching state of the circuit breaker knob (91), dead center of the knob (91) is crossed and the circuit breaker is switched to the ON position.

13. The mechanism as claimed in claim 12 wherein when the circuit breaker is switched to the ON position, the plug-in box locked with respect to the busbar interlock plate (81) for interlocking the plug-in box with the busbar.

14. The mechanism as claimed in claim 12 wherein when the ROH (13) is rotated corresponding to the change in position from the ON position to the OFF position:
the ROM shaft (41) and correspondingly the clutch rotating shaft pulley (42) are rotated in anti-clockwise direction resulting in the clutch wire (5) being released of a tension created by pull in the clutch wire (5) during clockwise rotation of the ROM shaft (41); and
the clutch pusher pulley (32), the pusher assembly (3) connected to the other bare end of the clutch wire (5), are rotated in the clockwise direction;
on clockwise rotation of the pusher frame assembly (4), the plunger cap (71) being released resulting in the plunger pin spring (73) decompressing and pushing back the plunger cap (71) and the plunger pin (72) disengaging the interlock the plunger pin 72 from the holes of the interlock plate (81).

15. The mechanism as claimed in claim 14 when a force transferred to the ROM (12) is sufficient to overcome a force required to change a switching state of the circuit breaker knob (91), dead center of the knob (91) is crossed and the circuit breaker is switched to the OFF position.
, Description:TECHNICAL FIELD
The present invention is related to mechanism for accommodating circuit breakers inside plug-in box.

BACKGROUND
Busways are installed in residential, commercial as well as industrial premises for the distribution purpose. Plug-in boxes are installed in the busways for the final distribution. Circuit breakers is heart of plug-in box. Protect of busways from the failure at the final distribution load is the prime objective of the circuit breaker. In such situations, safety of the working personnel in the vicinity the plug-in box is top most priority. There can be the possibility of try for removal of plug-in box from busway without switching OFF breaker. This can lead to fault and in respect the hazardous condition. As plug-in boxes are inserted with busway manually, there is the possibility of insertion while the breaker is in the ON condition. This can cause the severe damage to the surrounding. Considering threats during manual operations, at most required to provide the safety as the part of the feature of the installation of the product. This cannot be solved through rigid extension arm. And use of flexi arm involves excessive link work.
Most of the accessories in the busways installation are bound for customization as per available space for the route and the customer demand. Circuit breaker in the plug-in box is dependent on the application of the load requirements in the distribution and some cases customer choice. Some of the cases customers are particular with choice of manufacturer for the breaker inside the plug-in box. These variations are need to be taken care while executing the projects and developing the business. Thus, considering all the hidden as well as known aspects one universal mechanism as the solution is required. This will reduce the complexity of addressing the design or changes for dealing with verities of circuit breakers.
Available techniques are going with use of mechanical link works. But use of linkages complexity in design while manufacturing increases. This lead for additional accuracy and precision of interdependent components. All this increases development cost and assembly processes and time. Interdependency of mechanical components may lead for poor reliability.
Knob of every circuit breaker is at different positions with respect to their working principle, operating condition, complexity of the construction and manufacturer. Travel of the circuit breaker knob while changing its position from one state to another is also different for different circuit breakers. TRIP to RESET travel of the circuit breaker is another main concern while considering broad range of circuit breaker in plug-in box. So attaining same function with use of different make of CBs calls for varieties of components and tighter tolerance there by increasing cost.
Existing technology needs excessive metallic linkages to provide the co-ordination between operation of MCCB (breaker) knob and busway interlock mechanism. Provision of door and busway interlock depending on MCCB knob rotation and its position involves multiple joints leading to increased assembly time and limitation to rework.
The proposed invention helps to take care of the hurdles forming to the serving of the above discussed problem.

SUMMARY
This summary is provided to introduce a selection of concepts in a simplified format that is further described in the detail description of the invention. This summary is not intended to identify key or essential inventive concepts of the claimed subject matter, nor is it intended for determining the scope of the claimed subject matter.
In accordance with the purposes of the invention, the present invention as embodied and broadly described herein provides solutions allowing to use a mechanism common for the different circuit breakers without making the verities of components.
According to an aspect of the present invention, a mechanism for accommodating a circuit breaker in a plug-in box of a plug-in busbar is disclosed. The disclosed mechanism comprises of a busbar interlock plate for interlocking the plug-in box with the busbar and a rotary operating mechanism, ROM, fixed to the circuit breaker, the ROM comprising a rotary operating handle, ROH, and a ROM shaft, the rotary operating handle configured to be rotatable in correspondence to the movement of a circuit breaker knob. Further, the mechanism comprises of a clutch rotating shaft pulley connected to the ROM shaft, a pusher frame assembly mounting at least a clutch pusher pulley and pushers, a plunger assembly in communicating with the pusher frame assembly, the plunger assembly comprising at least push plunger caps, plunger pins, and plunger springs. Further, the mechanism comprises of a clutch wire with one bare end connected to the clutch rotating shaft pulley and another bare end connected to the clutch-pusher pulley to communicate transferrable force from the ROM via the clutch rotating shaft pulley to the clutch-pusher pulley. The rotation of the ROM shaft is transferred to the pusher assembly, as a result the pusher assembly dislocates the plunger pins thereby locking the busbar interlock plate.
Extended rotary operating mechanism (ROM) is proven and widely popular in different manufacturer. Travel distance while switching from ON to OFF and TRIP to RESET are well maintained with Extended ROM. While switching of breaker knob from OFF to ON position using extended ROM, clutch wire gets operated to locks the interlock with busways.
The current invention does not allow to switch ON the breaker if the busbar interlocks are not engaged to busbar. This condition simulated when the any operator tries to plug-out the plug-in box from the busways.
d.for preventive measure for water seeping inside the plug-in point busway when plug-in box, also referred to as the ‘power box’, or the ‘plug-in power box,’ is installed as well as when the plug-in box is not installed and the plug-in point is covered with the plug-in top cover.
The above aspects and the advantages will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings and claims.

BRIEF DESCRIPTION OF FIGURES
To further clarify the advantages and aspects of the invention, a more particular description of the invention will be rendered by reference to specific embodiments thereof, which is illustrated in the appended drawings. It is appreciated that these drawings depict only typical embodiments of the invention and are therefore not to be construed as limiting its scope. The invention will be described and explained with additional specificity and detail with the accompanying drawings, which are listed below for quick reference.
Figure 1 illustrates a representation of a clutch wire mechanism when a circuit breaker is in OFF condition.
Figure 2 illustrates a representation of a clutch wire mechanism when a circuit breaker is in ON condition.
Figure 3 illustrates a representation of a relation between clutch wire mechanism and pusher frame assembly when a circuit breaker is in OFF condition.
Figure 4 illustrates a representation of a relation between clutch wire mechanism and pusher frame assembly when a circuit breaker is in ON condition.
Figure 5 illustrates a representation of pusher frame assembly.
Figure 6 illustrates a representation of assembly process of the pusher frame assembly and the ROM shaft assembly.
Figure 7A illustrates a representation of mechanical interlock plug-in box when not inserted in busway front and rear view respectively in Figures 7A(a) and 7A(b).
Figure 7B illustrates a representation of mechanical interlock plug-in box when inserted in busway CB ON in Figure 7B(a) and CB OFF in7B(b).
Figure 8 illustrates a representation of mechanical interlock plug-in box when inserted in busway front and breaker is ON.
Figure 9 illustrates a representation of mechanical interlock plug-in box when inserted in busway front and breaker is OFF.
Figure 10 illustrates a representation of circuit breaker and circuit breaker knob.
Figure 11 illustrates a representation of cpusher pulley and clutch wire fixing.
It may be noted that to the extent possible like reference numerals have been used to represent elements like drawings. Further, those of ordinary skill in the art will appreciate that the elements in the drawings are illustrated for simplicity and may not have been necessarily drawn to scale. Furthermore, one or more elements may have been represented in the drawings by conventional symbols, and the drawings may show only those specific details that are pertinent to understanding of the embodiments of the invention so as not to obscure the drawings with details that will be readily apparent to those of ordinary skilled in the art having benefit of the description herein.

DETAILED DESCRIPTION
It should be understood at the outset that although illustrative implementations of the embodiments of the present invention are illustrated below, the present invention may be implemented using any number of techniques, whether currently known or in existence. The present disclosure should be in no way limited to illustrative implementations, drawings, and techniques, illustrated below, including the exemplary design and implementation illustrated and described herein, but may be modified within the scope of the appending claims along with the full scope of equivalents.
Unless otherwise defined, all terms and especially technical and/or scientific terms, used herein, may be taken to have the same meaning as commonly understood by one having an ordinarily skilled in the art.
Reference is made herein to some “embodiments”. It should be understood that an embodiment is an example of a possible implementation of any features and/or elements presented in the foregoing claims. Some embodiments have been described for the purpose of illuminating one or more potential ways in which the specific features and/or elements of the foregoing claims fulfill the requirements of uniqueness, utility, and non-obviousness.
Any particular and all details set forth herein are used in the context of some embodiments and therefore should not be necessarily taken as limiting factors to the foregoing claims. The claims and their legal equivalents can be realized in the context of the embodiments other than the ones used as illustrative examples in the description below.
The detailed description of the present invention is provided by way of illustrations shown in Figures 1 to Figures 11.
The said invention consists of one unit of busway 1 and the plug-in box 2 is inserted in it. Busbar interlock 8 is locked with top housing busway 111 to indicate that without use of specific feature plug-out of the plug-in box is not possible.
Circuit breaker 9 is mounted on the mounting plate 10 of the plug-in box 2 and it is fastened on the mounting bracket 11 such that movement of the circuit breaker 9 mounted on the mounting plate 10 is fixed with respect to horizontal and vertical direction.
Rotary operating mechanism (ROM) 12 is mounted on the circuit breaker knob 91 and one end of ROM shaft assembly 4 is fixed with the slot provided in ROM 12. Rotary operating handle (ROH) 13 is fixed on the enclosure door 22. Other end of shaft assembly 4 is engaged with arrangement provided in ROH 13 when enclosure door 22 is closed. ROM shaft 41 is inserted in the clutch rotating shaft pulley 42 and fasten with it using hardware 14.
Pusher frame assembly 3 consists clutch pusher pulley 32 is fixed using hardware 14 in the centre of frame base 31. Pusher 33 is fixed on the top surface of base frame 31 on either sides as per provision given for fixing. Pusher frame assembly 3 is fasten with engagement clamp 6 using step rivet 34, such that post riveting rotation of pusher frame assembly 3 is free w.r.t. engagement clamp 7. Engagement clamps 6 fasten on either sides of pusher frame assembly 3 are aligned and fixed with holes given in plug-in box enclosure wall 21. 360° rotation of pusher frame assembly 3 is restricted by terminating one bare end of clutch wire 5 in clutch pusher pulley 32 and other bare end is terminated in rotating shaft pulley 42. Clutch wire is clamped with the enclosure wall 21 such that rotation of pusher frame assembly 3 is controlled by rotation of ROM shaft assembly 4.
When enclosure door 22 is closed, ROM shaft 41 is engaged with the ROH 13. Position of circuit breaker knob 91 can changed from OFF to ON, TRIP to RESET and ON to OFF state by changing position of ROH 13. Rotation in ROH 13 is transferred to ROM 12 using ROM shaft 41, eventually circuit breaker knob 91 will be operated. When position of ROH 13 will be changed from OFF to ON position, ROM shaft 41 and therefore clutch rotating shaft pulley 42 will be rotated in clockwise direction. Clutch wire 5 will be pulled by the clutch wire rotating shaft pulley 42 fixed on ROM shaft 41. As other end of clutch wire 5 is terminated with clutch pusher pulley 32, pusher assembly 3 will be roated anti-clockwise along the axis of step rivet 34. As soon as, pusher 33 mounted on frame base 31 reached to plunger assembly 7, plunger cap 71 is pushed by pusher 33 on either sides of the enclosure walls 21. The plunger pin spring 73 gets charged and stores energy at this time. Therefore, alignment circular hole on the busbar interlock plate 81 is engaged with plunger pin 72. Due to this engagement keeping CB in ON condition the interlock plates 81 will not be able to be pulled back and hence interlock is achieved in ON condition of CB 9.
When the force transferred to the rotary operating mechanism (ROM) 12 is sufficiently larger to overcome the force needed to change the state of the knob 91, dead center of the knob mechanism is crossed and state of the circuit breaker 9 is changed into ON. Plug-in box 2 inserted in busway 1 will be locked by this arrangement.
When circuit breaker 9 is in ON condition and the force is transferred from ROH 13 to ROM 12 to switch OFF the circuit breaker 9, ROM shaft 41 and therefore clutch wire rotating shaft pulley 42 will be rotated in the anti-clockwise direction and tension generated in pulled position of clutch wire will be released due to returning on its normal position. As rotation of clutch pusher pulley 32 is synchronized with clutch rotating shaft puller 42, pusher frame assembly 3 will be rotated in the clockwise direction. Clockwise rotation of pusher frame assembly 3, releases the force on the plunger cap 71. At the same time the plunger pin spring 73 that had stored energy releases the same by pushing back the plunger cap 71 & plunger pin 72. This will disengage interlock between plunger pin 72 & interlock plate 81.
Once force transferred to ROM 12 is sufficiently enough to overcome the force applied by the knob 91 mechanism, dead center of the knob mechanism crossed and it changes from state of ON to OFF. For the ejection of the plug-in box 2 from the busway 1, Circuit breaker 9 is switched into OFF state and busbar interlock plate 81 is pulled outside on the either sides of plug-in box 2.
Now in this situation force applied on the ROH 13 will be transferred to ROM 12 through ROM shaft 41 to change the state of the breaker 9 from OFF to the ON state, but plunger pin 72 is not engaged with the alignment circular hole on the busbar interlock plate 81. But it will hit on the flat portion of the busbar interlock plate 81. Thus forward motion of the plunger pin is restricted and application of the force on the plunger cap 71 by pusher 33 mounted on pusher frame assembly 3 is not effective. Therefore, there is an obstruction for the knob 91 to cross its dead center. Thus, circuit breaker cannot be switched ON. In this condition only, plug-in box 2 can be inserted or ejected from the busways 1.
The advantages of the embodiments of the present invention include:
1. Use of unique mechanism with clutch wire across the different varieties of the circuit breakers in the plug-in box
2. Use of unique mechanism with clutch wire to attain interlock between busways & Plug in boxes
3. Locking of busbar interlock movement with respect to busways before switching from OFF to ON condition
4. Unlocking of the busbar interlock movement with respect to busways after the switching from ON to OFF condition
5. Suitable for multiple make of circuit breakers
Those skilled in the art will recognize other use cases, improvements, and modification to the embodiments of the present disclosure. All such improvements and other use-cases are considered within the scope of the concepts disclosed herein and the claims that follow.
References:
1. Busway
11. Top housing of busway
2. Plug-in Box
21. Enclosure wall
22. Enclosure door
3. Pusher frame assembly
31. Frame base
32. Clutch-pusher pulley
33. Pusher
34. Step rivet
35. Clutch wire stand
36. Termination cylinder
4. ROM shaft assembly
41. ROM shaft
42. Clutch rotating shaft pulley
5. Clutch wire
6. Engagement clamp
7. Plunger Assembly
71. Plunger Cap
72. Plunger Pin
73. Plunger pin spring
8. Busbar Interlock
81. Busbar Interlock Plate
9. Circuit breaker
91. Knob
10. Mounting plate
11. Mounting bracket
12. Rotary operating mechanism (ROM)
13. Rotary Operating handle (ROH)
14. Hardware (All kinds of hardware)