FORM2THE PATENTS ACT, 1970(39 of 1970)&The Patents Rules, 2003COMPLETE SPECIFICATION(See section 10; rule 13)
Title of the invention. - FOOLPROOFING OF TWO MATING COMPONENTS OR ASSEMBLIES REQUIRING MULTI-STAGE ASSEMBLY
2. Applicant(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 :

Field of the invention
The present invention relates to an assembly ensuring correct operation of circuit breakers and/or rotary operating mechanism (ROM), assemblies and sub-assemblies and the like. In particular, the invention concerns about the correct way of assembling components requiring multiple state matching thereby enhancing correct completion of operation by putting hindrance to assembly parts when assembled in wrong or abnormal manner/position.
Background and prior art
Generally, rotary operating mechanism (ROM) has one stable state viz. OFF and is sold in the market in discreet. This ROM is used along with molded case circuit breaker (MCCB) . MCCB has three stable states viz. ON, OFF & TRIP.
Thus rotary operating mechanism is a uni-stable device whereas the MCCB is a tri-stable device. The rotary operating mechanism is mounted on the MCCB. The basic need for the industries is that the circuit breaker should function in an accurate manner in its ON, OFF or TRIP state and should be able to provide the component location in correspondence to the actual state of the breaker. In order to function properly, the states of both rotary operating mechanism and molded case circuit breaker must be same.
But the chance of wrong assembly of rotary operating mechanism and molded case circuit breaker exists. Problem shall occur if the rotary operating mechanism, in OFF state
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will be mounted on MCCB in ON state, or otherwise; the ROM, in OFF state be mounted on MCCB in TRIP state. This mismatch shall cause:
1) Wrong operation of MCCB, causing fatal accidents, a risk to man and material
2) Damage to rotary operating mechanism
3) Wastage of time and effort in reassembly of rotary operating mechanism and MCCB in correct states.
US5,387,770 describes an electric operating device for a circuit breaker includes a cam which is turned in a predetermined direction by an electric motor which rotates in response to operating signals, and a slider having cam engaging portions which make engagement and disengagement every half revolution of the cam, and an opening into which the handle of the circuit breaker is inserted, the slider being slidable in the directions of the "on" and "off" operations of the handle. In the device, in response to the "on" and "off" operations, the cam engaging portions of the slider are disengaged from the cam, respectively. With the device, the tripping of the circuit breaker handle can be displayed without an intricate mechanism nor an additional space. However, no such arrangement is found in this patent document which could provide a hindrance area restricting wrong assembling of components.
Thus there is a need to provide for an assembly which would ensure correct way of assembling components requiring multiple state matching thereby enhancing correct completion of operation.
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US6,504,460 describes an actuator mechanism, for a circuit breaker having an operating handle, which includes a slider assembly and a mounting plate assembly. The slider assembly has a rigid, generally planar member with at least one notch. The mounting plate assembly has at least two generally parallel, spaced flanges and is structured to mount on the circuit breaker housing. One of the at least two flanges is structured to cooperate with the notch to allow the slider assembly to be slidably coupled to the mounting plate between the at least two flanges. No arrangement for correct way of assembling the components in the circuit breaker has been taught in this patent document.
The present inventor has found that correct operation of the circuit breakers and/or rotary operating mechanism (ROM) can be ensured by providing active hindrance zone in circuit breaker assembling thereby restricting wrong assembling of components in the circuit breaker.
Objects of the invention
It is one of the objects of the present invention to overcome the disadvantages of the prior art.
Another object of the present invention is to provide an assembly for correct way of assembling components requiring multiple state matching.
Another object of the present invention is to provide active hindrance area.
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Summary of the invention
Accordingly, one aspect of the present invention is to provide an assembly for enhancing correct completion of operation of circuit breakers and/or rotary operating mechanisms, said assembly comprising :
slider means having rounded slot profiles for mounting the slider in housing of the rotary operating mechanism, said slots being in ergonomics with the housing,
wherein said slider means comprising a plurality of slots;
plurality of link means being operatively coupled to each other at one end and being operatively engaged at one end with the slot of the slider means,
wherein said link means when actuated by the slider perform swiveled motion so as to provide active hindrance zone thereby restricting wrong assembling of components.
Detailed description of the invention
In the present invention the assembly for restricting wrong assembling of components of circuit breakers and/or rotary operating mechanisms comprises slider means having rounded slot profiles for mounting the slider in the circuit breaker housing. The slots are provided in ergonomics with the housing so as to provide the sliding motion.
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The slider means comprises a plurality of slots on the surface having their axis in between. The assembly comprises plurality of link means which comprises a hook link and plain link. The plain link is operatively coupled with the hook link and communicates with the slider via the hook link. The plain link is pivotally fixed on one end with the hook link and on the other end is pivoted to the housing so as to provide a swivel motion of the links when actuated by the linear motion of the slider. The joint of the plain pin and the hook pin is also riveted so as to provide swivel motion in a predetermined plane and to give the link means single degree of motion i.e. swivel along that plane. The links are fixed such that they provide active hindrance area corresponding to the total length of travel of the slider by sweeping through a predetermined area.
Brief description of the accompanying drawings
Figure 1 illustrates the slider means of the assembly of the present invention.
Figure 2 illustrates hook link of the assembly of the present invention.
Figure 3 illustrates plain link of the assembly of the present invention.
Figure 4 illustrating a rivet joint.
Figure 5 illustrates the pivot pin used in the present invention.
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Figure 6 illustrates a rotary operating mechanism housing.
Figure 7 illustrates the assembly of the present invention just before assembling it in the rotary operating mechanism housing.
Figure 8A, 8B and 8C illustrate the active hindrance zone in OFF, TRIP and ON state of the circuit breaker mechanism.
Detailed description of the accompanying drawings
The invention will now be illustrated with reference to accompanying drawings, which are provided for ready and better understanding of the invention. The drawings represent only a specific working embodiment of the assembly according to the invention although variants of the assembly may be made within the scope and ambit of the present invention.
Referring to figure 1, the slider (1) comprises slots (1A and IB) with axis (1C) in between. Slider (1) comprises slots (ID) ergonomically designed to mount the slider (1) in the housing (6A as shown in figure 6).
Referring to figure 2, hook (2) comprises round shaped groove (2B) and axis (2A) for mating with the plain link (3) as shown in figure 3.
Referring to figure 3, the plain link (3) comprises to mating axes (3A and 3B).
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Referring to figure 7, the assembly comprising the slider (1), hook link (2) engaged to the slider (1), plain link (3) communicating with the slider (1) via the hook link (2), slots (1A and IB) in the slider (1) before assembling
with housing (6A) is shown.
In figures 8A, 8B and 8C the assembly located in housing (6A) is shown. The links (2 and 3) sweeps through a hindrance area (HA) during OFF, TRIP and ON state of the circuit breaker is shown.
Assembling of the components of the assembly :
A) . Riveting process to be done via using hook link, plain link and rivet. This shall provide the link between these components, thereby mating axis 2A of hook link, axis 3A of plain link and axis 4A of rivet. Here the link assembly thus formed shall have free movement.
B) . Insertion of link assembly viz. hook link (along 2B axis) in slot 1A of the slider, such that the hook engages in the slider and axis 2B of hook link matches with axis 1C of slider.
C) . Pivot pin (4B) shall be inserted in the housing in the slot (9A) specified in figure 6.
D) . Now, the whole slider-link assembly has to be inserted in the housing of the mechanism along with the sliding rods, such that axis along 3B is inserted at location 5B.
E). Circlip to be inserted in groove (5A).
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F) . At last, the cover and the tightening screws to be fastened on the housing.
The invention has been shown and described in a preferred form only and many variations may be made in the invention, which will still be comprised within its spirit. It is understood, therefore, that the invention is not limited to the details cited above. The pivot pin, rivet means and shape of the groove of the hook link as herein described do not limit the scope of the present invention. The shape of the groove can be any and yet the invention can be performed. The pivot pins and rivet means can be replaced by its technical equivalence and yet the invention can be performed. The structure thus conceived is susceptible of numerous modifications and variations, all the details may furthermore be replaced with elements having technical equivalence. In practice the materials and dimensions may be any according to the requirements, which will still be comprised within its true spirit.
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We claim
1. An assembly for enhancing correct completion of
operation of circuit breakers and/or rotary operating
mechanisms, said assembly comprising :
slider means having rounded slot profiles for mounting the slider in housing of the rotary operating mechanism, said slots being in ergonomics with the housing,
wherein said slider means comprising a plurality of slots;
plurality of link means being operatively coupled to each other at one end and being operatively engaged at one end with the slot of the slider means,
wherein said link means when actuated by the slider perform swiveled motion so as to provide active hindrance zone thereby restricting wrong assembling of components.
2. Assembly as claimed in claimed 1, wherein the link means comprises hook link and plain link.
3. Assembly as claimed in claims 1 and 2, wherein the hook link comprises a groove means so as to engage in
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the slot in a manner that the axis of the groove operatively matches with the axis of the slider.
4. Assembly as claimed in claims 1 to 3, wherein the plain link comprises of pivot joints at its both end such that the linear motion of the slider means is transformed to swiveled motion of the link means so as to enable the link means to sweep through a predetermined area.
5. Assembly as claimed in claims 1 to 4, wherein the link means being adapted to provide active hindrance area corresponding to the total length of travel of the slider.
6. Assembly as claimed in any one of the preceding claims being adapted for use in circuit breakers, assemblies and sub assemblies and the like.
7. Assembly as claimed in any one of the preceding claims adapted to provide active hindrance zone during ON, OFF and TRIP states of the circuit breaker.
8. Assembly as claimed in any preceding claims adapted for correct completion of operation in moulded case circuit breakers, assembly, two sub-assembly components both of which are multi-stable/uni-stable
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and can be assembled in their discreet states resulting in mal-operation of whole assembly
9. An assembly for enhancing correct completion of
operation in circuit breakers as substantially herein
described and illustrated with reference to
accompanying figures.

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ABSTRACT
TITLE : FOOLPROOFING OF TWO MATING COMPONENTS OR ASSEMBLIES REQUIRING MULTI-STAGE ASSEMBLY
The present invention relates to an assembly for enhancing correct completion of operation of circuit breakers and/or rotary operating mechanisms. The assembly comprises slider means (1) having rounded slot profiles (ID) for mounting the slider (1) in housing (6A) of the rotary operating mechanism. The slider means (1) comprises plurality of slots (1A, IB), plurality of link means (2 , 3) operatively coupled to each other at one end and at the other end with the slots (1A, IB) of the slider means (1) . The link means (2, 3) when actuated by the slider (1) perform swiveled motion so as to provide active hindrance zone thereby restricting wrong assembling of components.
Figure 7