Claims:
We claim:
1. An integrated stitching machine unit (SMU) for making a stitched joint between multiple metal and/or non-metal sheets of similar or different materials, said SMU comprising:

• at least one first sub-unit (U1) for punching holes (H) in a predefined pattern through said multiple sheets;

• at least one second sub-unit (U2) for passing threads through said punched holes (H) for stitching together said multiple sheets and obtain a stitched joint thereof, said stitching threads being compatible with the material of said sheets;

• at least one third sub-unit (U3) for uniform heating and/or pressing of said stitched joint from both sides thereof, for making a leakproof and/or waterproof joint, wherever functionally required;

wherein said SMU is equipped with a graphical user interface (GUI) for selecting compatible thread with/without an adhesive coating thereon and for choosing a thread pattern thereof based on the operator’s inputs of various parameters and depending on the functional and aesthetic requirements as well as the targeted cost of the component to be produced.

2. Integrated multiple-sheet stitching machine unit (SMU) as claimed in claim 1, wherein said multiple metal and/or non-metal sheets are of the same or different materials.

3. Integrated multiple-sheet stitching machine unit (SMU) as claimed in claim 1, wherein said multiple metal and/or non-metal sheets are of the same or different materials of the same or different thicknesses.

4. Integrated multiple-sheet stitching machine unit (SMU) as claimed in claim 1, wherein said multiple metal and/or non-metal sheets comprise a combination of metal and plastic sheets.

5. Integrated multiple-sheet stitching machine unit (SMU) as claimed in claim 1, wherein said multiple metal and/or non-metal sheets are a combination of metal/plastic/fabric sheets.

6. Integrated multiple-sheet stitching machine unit (SMU) as claimed in claim 2, wherein said multiple sheets are of a combination of metal and aluminum sheets for joining stamped parts of Body-In-White (BIW).

7. Integrated multiple-sheet stitching machine unit (SMU) as claimed in claim 1, wherein said graphical user interface (GUI) facilitates in selecting the thread compatible with the combination of material/s of said multiple metal and/or non-metal sheets and the thread pattern for stitching thereof based on the operator’s inputs of various parameters like material and thickness of the sheets as well as depending on the functional and aesthetic requirements and the targeted cost of the component to be produced by stitching using said SMU.

8. Integrated multiple-sheet stitching machine unit (SMU) as claimed in claim 1, wherein said graphical user interface (GUI) facilitates in suggesting and selecting the adhesive coating on the thread depending on the required leakproof and/or waterproof joint to be made by said SMU.

9. Integrated multiple-sheet stitching machine unit (SMU) as claimed in claim 1, wherein said graphical user interface (GUI) facilitates in suggesting and selecting the pitch or spacing between said holes (H) and the diameter of said holes (H), the diameter of the selected thread depending on the strength requirement of the component and the distance to be covered for making said stitched joint thereof using said SMU.

10. Integrated multiple-sheet stitching machine unit (SMU) as claimed in claim 1, wherein said SMU comprises a piercing needle of very strong material for punching holes (H) and a threading needle of a comparatively softer material for stitching.

11. A method for stitching together multiple metal and/or non-metal sheets of similar or different materials by means of said stitching machine unit (SMU) for making a stitched joint, said method comprising the steps of:

(a) setting said GUI by the operator by inputting the stitching parameters depending on the material/s and thickness/es of said multiple sheets to be stitched together, pitch of holes (H) to be made and length of the joint to be stitched, wherein said GUI predefines the material and diameter and/or adhesive coating on the selected thread/s;

(b) punching holes (H) of predefined diameter over a required length of said multiple sheets placed one over the other in a predefined pattern and punched by means of said first sub-unit (U1);

(c) passing the selected compatible thread/s through said punched holes (H) for stitching by means of said second sub-unit (U2) to obtain a predefined thread pattern/s thereon on the stitched joint produced thereby;

(d) heating of said stitched joint at a predefined temperature and for a predefined duration to obtain a waterproof and/or leakproof joint of said multiple sheets, wherever functionally required; and/or

(e) uniformly pressing together said heated stitched joint for closing any gaps or spaces between said punched holes (H) and said thread/s of said stitched joint and to flatten out any burrs formed as crowns thereon;

wherein both actions (d) and (e) are executed by same third sub-unit (U3) and the sequence thereof is interchangeable based on the requirements.

12. Method as claimed in claim 11, wherein said first, second and third sub-units (U1, U2, U3) are integrated to operate in a predefined chronological sequence.

13. Method as claimed in claim 11, wherein said first, second and third sub-units (U1, U2, U3) are integrated to operate in a predefined sequence during travel of said SMU from one end of the stitching line to be made to the other end thereof.
14. Method as claimed in claim 11, wherein said first, second and third sub-units (U1, U2, U3) are integrated to operate in a chronological sequence as follows:

(i) punching of holes by first sub-unit (U1) during the travel of said SMU from the end of the stitching line to be made to the other end thereof;

(ii) passing thread/s through said punched holes by said second sub-unit (U2) by a piercing needle to obtain a stitched joint line;

(iii) heating of said stitched joint line to obtain a leakproof and/or waterproof joint by said third sub-unit, wherever functionally required; and/or

(iv) uniform pressing of said stitched joints by third sub-unit to flatten out any burrs formed as crowns thereon.

15. Method as claimed in claim 12, wherein said first and third sub-units (U1, U3) are positionally interchangeable to facilitate in reducing cycle time by interchanged position thereof.

16. Method as claimed in claim 15, wherein said first and third sub-units (U1, U3) are positionally interchangeable by just rotating the entire unit by 1800 to facilitate in reducing cycle time by interchanged position thereof as follows:

(I) punching of holes (H) by said first sub-unit (U1) during the first travel of said SMU from the first end of the stitching joint line to be made to the other end thereof to obtain a punched hole line;

(II) passing of said compatible thread/s through said punched holes (H) by means of said second sub-unit (U2) using a piercing needle thereof to obtain a stitched joint line;

(III) heating of said stitched and pressing together joint of multiple sheets to obtain a leakproof and/or waterproof multiple sheet stitched joint by the third sub unit, wherever functionally required; and

(IV) uniform pressing of said stitched joint line during the forward travel of said SMU by said third sub-unit immediately after said second sub-unit passes said stitched joint line and to flatten out any burrs formed as crowns thereon;

wherein both actions (III) and (IV) are executed by same third sub-unit (U3) and said sequence thereof is interchangeable based on the requirements.

17. Method as claimed in claim 12, wherein said SMU is rotated by 1800 for additional stitching runs during return travel to make complex stitch patterns.

Digitally Signed.

Dated: this 16th day of April 2019. (SANJAY KESHARWANI)
REGN. No. IN/PA-2043
APPLICANT’S PATENT AGENT , Description:FIELD OF INVENTION

The present invention relates to a novel process for joining multiple sheets. In particular, the present invention relates to a process of joining metal and/or non-metal sheets of similar and/or different materials by eliminating stress generation during this joining process. More particularly, the present invention relates to a process of stitching together multiple metal and/or non-metal sheets of similar and/or different material and optionally sealing the stitched joint thereof in a leakproof manner.

BACKGROUND OF THE INVENTION

For example, in automobile manufacturing plant, a large number of components are required to be connected together by employing different joining processes, such as welding, applying adhesive etc. In particular, Body-In-White (BIW) are manufactured in body shop by using spot welding as well as by adhesive application.

When weld spots are used for joining body panels to make BIW, there is intermittent load distribution and load is transferred from one body panel to another through these weld spots as concentrated point loads. For reducing the weight of BIW by using Advance High Strength Steel (AHSS), the process of welding of thin or ultra-thin gauge metal components becomes quite difficult and welds/joints obtained after such welding process are not durable enough.

It is known that the use of structural adhesives uniformly transfers the load between the bonded body panels, because the load gets distributed evenly along the joint-line and is not concentrated as point loads, but the joining is not as strong as that of welding.

Presently, most of the automobile manufacturing plants use the traditional metal to metal joining methods such as spot welding and/or applying adhesives, depending on the merits of each of these methods, wherever possible.
Therefore, there is a need for obtaining the advantages both of spot welding and adhesive bonding processes for joining of metal and/or non-metal sheets, e.g. metal to metal joints required for making body panels. Any such improved process should also cater to multi-material stitching for making components made of sheet materials, such as body-panels of BIWs, which may also require leakproof and/or watertight joints.

OBJECTS OF THE INVENTION

Some of the objects of the present invention - satisfied by at least one embodiment of the present invention - are as follows:

An object of the present invention is to provide a multiple metal and/or non-metal sheet joining process which combines the advantages of joining and adhesive boding processes.

Another object of the present invention is to provide a multiple metal and/or non-metal sheet joining process which eliminates stress generation during this sheet joining process.

Still another object of the present invention is to provide a multiple metal and/or non-metal sheet joining process which offers the advantages of spot welding as well as adhesive boding of different metals.

Yet another object of the present invention is to provide an integrated unit for performing metal and/or non-metal sheet joining process for sheets made of similar or different materials.

A further object of the present invention is to provide an integrated unit for stitching together multiple metal and/or non-metal sheets to make leakproof joint therebetween.

A still further object of the present invention is to provide an integrated unit for making leakproof and/or water-tight joints for body panel of BIWs in automobiles.
These and other objects and advantages of the present invention will become more apparent from the following description, when read with the accompanying figures of drawing, which are however not intended to limit the scope of the present invention in any way.

SUMMARY OF THE INVENTION

In accordance with the present invention, there is provided an integrated stitching machine unit (SMU) for making a stitched joint between multiple metal and/or non-metal sheets of similar or different materials, the SMU comprising:

• at least one first sub-unit for punching holes in a predefined pattern through the multiple sheets;

• at least one second sub-unit for passing threads through the punched holes for stitching together the multiple sheets and obtain a stitched joint thereof, the stitching threads being compatible with the material of the sheets;

• at least one third sub-unit for uniform heating and/or pressing of the stitched joint from both sides thereof, for making a leakproof and/or waterproof joint, wherever functionally required;

wherein the SMU is equipped with a graphical user interface (GUI) for selecting compatible thread with/without an adhesive coating thereon and for choosing a thread pattern thereof based on the operator’s inputs of various parameters and depending on the functional and aesthetic requirements as well as the targeted cost of the component to be produced.

Typically, the multiple metal and/or non-metal sheets are of the same or different materials.

Typically, the multiple metal and/or non-metal sheets are of the same or different materials of the same or different thicknesses.

Typically, the multiple metal and/or non-metal sheets comprise a combination of metal and plastic sheets.

Typically, the multiple metal and/or non-metal sheets are a combination of metal/plastic/fabric sheets.

Typically, the multiple sheets are of a combination of metal and aluminum sheets for joining stamped parts of Body-In-White (BIW).

Typically, the graphical user interface facilitates in selecting the thread compatible with the combination of material/s of the multiple metal and/or non-metal sheets and the thread pattern for stitching thereof based on the operator’s inputs of various parameters like material and thickness of the sheets as well as depending on the functional and aesthetic requirements and the targeted cost of the component to be produced by stitching using the SMU.

Typically, the graphical user interface facilitates in suggesting and selecting the adhesive coating on the thread depending on the required leakproof and/or waterproof joint to be made by the SMU.

Typically, the graphical user interface facilitates in suggesting and selecting the pitch or spacing between the holes and the diameter of the holes, the diameter of the selected thread depending on the strength requirement of the component and the distance to be covered for making the stitched joint thereof using the SMU.

Typically, the SMU comprises a piercing needle of very strong material for punching holes and a threading needle of a comparatively softer material for stitching.

In accordance with the present invention, there is also provided a method for stitching together multiple metal and/or non-metal sheets of similar or different materials by means of the SMU for making a stitched joint, the method comprising the steps of:
(a) setting the GUI by the operator by inputting the stitching parameters depending on the material/s and thickness/es of the multiple sheets to be stitched together, pitch of holes to be made and length of the joint to be stitched, wherein the GUI predefines the material and diameter and/or adhesive coating on the selected thread/s;

(b) punching holes of predefined diameter over required length of the multiple sheets placed one over the other in a predefined pattern and punched by means of the first sub-unit;

(c) passing the selected compatible thread/s through the punched holes for stitching by means of the second sub-unit to obtain a predefined thread pattern/s thereon on the stitched joint produced thereby;

(d) heating of the stitched joint at a predefined temperature and for a predefined duration to obtain a waterproof and/or leakproof joint of the multiple sheets, wherever functionally required; and/or

(e) uniformly pressing the heated stitched joint for closing any gaps or spaces between the punched holes and the thread/s of the stitched joint and to flatten out any burrs formed as crowns thereon;

wherein both above actions (d) and (e) are executed by same third sub-unit and the sequence thereof is interchangeable based on the requirements.

Typically, the first, second and third sub-units are integrated to operate in a predefined chronological sequence.

Typically, the first, second and third sub-units are integrated to operate in a predefined sequence during travel of the SMU from one end of the stitching line to be made to the other end thereof.

Typically, the first, second and third sub-units are integrated to operate in a chronological sequence as follows:

(i) punching of holes by first sub-unit during the travel of the SMU from the end of the stitching line to be made to the other end thereof;
(ii) passing thread/s through the punched holes by the second sub-unit by a piercing needle to obtain a stitched joint line;

(iii) heating of the stitched joint line to obtain a leakproof and/or waterproof joint by the third sub-unit, wherever functionally required; and/or

(iv) uniform pressing of the stitched joints by third sub-unit to flatten out any burrs formed as crowns thereon.

Typically, the first and third sub-units are positionally interchangeable to facilitate in reducing cycle time by interchanged position thereof.

Typically, the first and third sub-units are positionally interchangeable by just rotating the entire unit by 1800 to facilitate in reducing cycle time by interchanged position thereof as follows:

(I) punching of holes by the first sub-unit during the first travel of the SMU from the first end of the stitching joint line to be made to the other end thereof to obtain a punched hole line;

(II) passing of the compatible thread/s through the punched holes by means of the second sub-unit using a piercing needle thereof to obtain a stitched joint line;

(III) heating of the stitched and pressing together joint of multiple sheets to obtain a leakproof and/or waterproof multiple sheet stitched joint by the third sub unit, wherever functionally required; and

(IV) uniform pressing of the stitched joint line during the forward travel of the SMU by the third sub-unit immediately after the second sub-unit passes the stitched joint line and to flatten out any burrs formed as crowns thereon;

wherein both above actions (III) and (IV) are executed by same third sub-unit and the sequence thereof is interchangeable based on the requirements.
Typically, the SMU is rotated by 1800 for additional stitching runs during return travel to make complex stitch patterns.

DESCRIPTION OF INVENTION

In accordance with the present invention, multiple sheets of various materials can be joined together by using compatible material thread/stitch. Here, the sheets as well as thread materials can be metal, plastic, fabric etc.

The present invention is described hereinbelow with reference to an embodiment, in which BIWs made of body panels of metal and/or non-metal sheets are produced by the inventive process of joining multiple sheets of the same and/or different materials, such as steel and aluminum sheets used for making BIWs by stitching with the help of metal threads.

However, the process described herein is not limited to this metal to metal stitching but can also be used for stitching together the sheets of two similar or different materials, such as metals, plastics, fabric etc. to make different products requiring leakproof joints. Therefore, multiple metal and/or non-metal sheets can be stitched together by using compatible thread therefor. This thread may also have an adhesive layer on the surface thereof for obtaining leakproof joints.

Theoretically, the capacity (material and diameter of the punch) of punching unit limits the usage thereof according to the specified restriction therefor. The punch material and diameter thereof are selected based on the specific stitching application. Obviously, two steel sheets of different sheet thicknesses would require a much stronger punching material than that required to stitch together two aluminum sheets of the same thicknesses.

In accordance with an embodiment of the present invention, metals (steel, Al) normally used for making body panels of BIWs are stitched together by using compatible metal threads. An integrated stitching machine unit having a piercing needle made of a very strong material such as titanium is used for piercing the flanges of the metal panels to be joined. This needle pierces the body panel flanges. Another needle passes a metal thread through the already pierced hole and almost fills the gap of the pierced hole.
Subsequently, a compatible material is sprayed on this stitched metal to metal joint to fill-up the space remaining between this pierced hole and the metal thread and finally this stitched and adhesive bonded metal to metal joint is heated and pressed together to eliminate any cavities therebetween to obtain a leakproof joint after completion of this metal to metal joining operation.

In the process according to the present invention, the pitch (spacing) between such pierced holes and the diameter of thread as well as the pierced holes can be adjusted as per the required strength of the body panel of BIW or any other metallic components made by such metal to metal stitched joints.

Since the stitched metal to metal joint is heated and followed by pressing it from both sides of the stitched joint, the burrs formed as metal crown are flattened out to make the joint smoother and completely pressed and thus fully seals such metal to metal stitched joint and eliminates the possibility of any water leakage therefrom.

Because of this process of heating followed by pressing the metal to metal stitched joint uniformly, a very strong bond is formed along the stitched metal to metal joint line. These stitching can be done in single or multiple lines depending on the strength requirement of the components being stitched together by this process, which can also be adapted for harnessing various stitching patterns. The present invention also provides a device having two jaws for metal piercing, adhesive spraying, to be followed by jaw pressing operation.

Since thousands of weld spots, e.g. more than 6000 weld spots are required in the present day in BIW manufacturing plants, the metal to metal stitching device developed according to the present invention having good accessibility to both sides of the metal flanges of body panels, can also be used to replace the conventional weld spots with the least change in the existing infrastructure in the body shops of the present day automobile manufacturing plants.

BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS

The present invention will be briefly described with reference to the accompanying drawings, wherein:

Figure 1 shows a schematic representation of the stitching machine unit SMU configured in accordance with the present invention.

Figure 2 shows a schematic representation of the first sub-unit of the stitching machine unit SMU of Figure 1 used for punching holes in components to be made by joining together of multiple sheets.

Figure 3 shows a schematic representation of the second sub-unit of the stitching machine unit SMU of Figure 1 used for passing threads through the holes punched together by the first sub-unit.

Figure 4 shows a schematic representation of the third sub-unit of the stitching machine unit SMU of Figure 1 used for heating and pressing the stitches made by the second sub-unit for obtaining a leakproof stitched joint thereof, such as metal to metal joint for body panels of BIW in automobile body shops.

DETAILED DESCRIPTION OF THE ACCOMPANYING DRAWINGS

In the following, the multi-material sheet stitching machine (SMU) configured in accordance with the present invention and the process of multi-material stitching by using this SMU will now be described in more details with reference to the accompanying drawings without limiting the scope and ambit of the present invention in any way.

Figure 1 shows a schematic representation of the stitching machine unit SMU configured in accordance with the present invention. This unit is electrically powered via power cable P, for example to perform the metal to metal joining process by stitching multiple sheets S1, S2 of same or different materials by using threads T of a compatible material or metal, for making components such as body panels of BIWs. The stitching machine unit SMU developed according to the present invention houses three sub-units; U1 for punching holes H, sub-unit U2 for passing threads T through these punched holes H, and sub-unit U3 for heating and pressing together these body panels S1, S2 already punched and stitched by sub-units U1 and U2. These sheets S1, S2 are fixed in position and SMU is moved along the joining path. The passing of thread for stitching these sheets S1, S2 together is an automated process. However, this process for stitching multiple sheets of similar or different metals for making desired components can also be used for stitching similar or different metals, plastics, fabrics using threads of compatible materials, also of metals, plastics or fabrics.

Figure 2 shows a schematic representation of the first sub-unit U1 of the stitching machine unit SMU of Figure 1 moving in the direction M and for example, used for punching holes H in metal sheets S1, S2 to be joined together. The first sub-unit U1 punches holes H in the sheets (e.g. steel sheets) S1, S2 to be joined by aligning and superimposing the flanges thereof at a particular location, i.e. after placing the flange of one sheet over the other to obtain a stitched joint.

Figure 3 shows a schematic representation of the second sub-unit U2 of the stitching machine unit SMU of Figure 1, for example used here for passing metal threads T through holes H punched in sheets S1, S2 for stitching these metal sheets together to obtain sheet metal components such as body panels of BIWs by first sub-unit U1. The sheets S1, S2 punched in first unit U1 are now passed under second sub-unit U2, which passes a stitching thread T made up of a material compatible with sheets S1, S2 to be joined together (e.g. steel). The material and diameter of thread T is based on the functional requirements and the compatibility thereof with multiple sheets S1, S2. The metal threads T may have expandable adhesive coatings. The choice of this coating depends on the functional requirement of the stitched joint, such as a water-tight/leak-proof joint or a simple stitched joint. There are many expandable structural adhesives available in market from various suppliers and the stitching wire or thread used has one of such adhesive coating thereon. When SMU moves forward, U2 has already woven threads in some pattern.
Figure 4 shows a schematic representation of third sub-unit U3 of stitching machine unit SMU of Figure 1, for example U3 is used for heating the metal components obtained as multiple metal sheets stitched together by second sub-unit U2. For obtaining a leakproof metal to metal stitched joint of these sheets S1 and S2, for example for making body panels of BIW in automobile body shop, this third and final unit U3 simply heats these stitched sheet panels S1, S2 and presses them together from both sides. Alternatively, this final unit U3 can also spray an adhesive material, in case heating and adhesive coated wire/thread is not advisable for the sheet combination to be stitched, for ensuring a leakproof stitching e.g. plastic to plastic stitching. This heating primarily facilitates the expansion of adhesive coating to fill-in the space remaining between punched holes H and stitching threads T to ensure that no water and/or air should pass through the stitched multiple sheet joint during the usage of these joined/stitched parts, e.g. body panels of BIW. The final sub-unit U3 can be changed depending on the requirement of a simple or leak-proof and/or air-tight component and/or a simple stitched joint. The pattern of stitching, the stitching thread material and adhesive coating can be varied based on the metal and/or plastic and/or fabric sheets to be stitched together and depending on the functional requirements of the sheet joint produced thereby. The graphical user interface (GUI) facilitates in selecting various stitching patterns based on the functional and aesthetic advantages and by considering the costs involved. Graphics User Interface (GUI) helps here in adjusting various parameters of the stitching process based on the operator’s inputs, such as material and thickness of the sheets to be joined, adhesives layer material to be used and so on. Based on these operator’s inputs, SMU selects an appropriate maximum speed for stitching and possible stitching patterns, etc. The present invention also makes it possible to replace most of currently employed substantially hazardous welding operations by stitching metal sheets using such SMUs and can be produced in different models to be sold/supplied at very reasonable cost for various manufacturing applications. Apart from this use for making body panels of BIWs by stitching of metals sheets, this SMU can also be used for joining together of multiple sheets of metals and/or other non-metal materials, such as plastics and/or fabric to produce components requiring with or without leakproof joints.
This process and SMU can also be used for joining metal and/or non-metal sheets along planar or curved profiled due to the integrated configuration thereof.

WORKING OF THE INVENTION

The configured in accordance with the present invention operates in the manner described below:

SMU is a gadget that when moves over a layers of metal and/or non-metal sheets that are to be stitched together (specially any metal to any metal, plastic to metal and plastic to plastic), the first sub-unit U1 punches holes H in specific pattern. As the SMU moves forward, the second unit U2 passes compatible thread through these punched holes H and on this SMU moving forward again, the stitched thread (metal or plastic or fabric thread), alternatively adhesive coated thread makes a desired thread pattern, which is made available to final sub-unit U3 for subsequent heating or adhesive spraying operations and pressing from both sides. This way the sheets can be imparted leakproof/water proof stitched patterns on these stitched multiple sheets.

TECHNICAL ADVANTAGES AND ECONOMIC SIGNIFICANCE

The configured in accordance with the present invention has the following technical and economic advantages:

• Facilitates joining multiple material sheets, such as any metal to any other metal, plastic to metal, plastic to plastic with a leakproof joint.

• Offers a faster and stronger but safer than the conventional spot welding processes used in Automobile OEM body shop used for welding BIWs.

• Can directly join the plastic trims to metal panels of vehicle doors.

• Can impart elegance to car interior by offering various combinations of metal with glossy finish and plastic threads and stitching patterns.

• Increases the stiffness of ultra-thin metal panels making them usable for lightweight car for Electric Vehicles when stitched alone.

• Saves cost of using established multi-metal joining processes based on metallurgical properties for joining multi metals, simply by mechanically stitching them together.

• Can join composites with steels and aluminum and thus offers excellent possibilities for manufacturing lightweight cars in near future for various multi-material combination possibilities.

The foregoing description of the specific embodiments will so fully reveal the general nature of the embodiments herein that others can, by applying current knowledge, readily modify and/or adapt for various applications such specific embodiments without departing from the generic concept, and, therefore, such adaptations and modifications should and are intended to be comprehended within the meaning and range of equivalents of the disclosed embodiments.

It is to be distinctly understood that the foregoing descriptive matter is to be interpreted merely as illustrative of the invention and not as a limitation. The exemplary embodiments described in this specification are intended merely to provide an understanding of various manners in which this embodiment may be used and to further enable the skilled person in the relevant art to practice this invention.

Although, the embodiments presented in this disclosure have been described in terms of its preferred embodiments, the skilled person in the art would readily recognize that these embodiments can be applied with modifications possible within the spirit and scope of the present invention as described in this specification by making innumerable changes, variations, modifications, alterations and/or integrations in terms of materials and method used to configure, manufacture and assemble various constituents, components, subassemblies and assemblies, in terms of their size, shapes, orientations and interrelationships without departing from the scope and spirit of the present invention.
The numerical values given of various physical parameters, dimensions and quantities are only approximate values and it is envisaged that the values higher or lower than the numerical value assigned to the physical parameters, dimensions and quantities fall within the scope of the disclosure unless there is a statement in the specification to the contrary.

Throughout this specification, the word “comprise”, or variations such as “comprises” or “comprising”, shall be understood to imply including a described element, integer or method step, or group of elements, integers or method steps, however, does not imply excluding any other element, integer or step, or group of elements, integers or method steps.

The use of the expression “a”, “at least” or “at least one” shall imply using one or more elements or ingredients or quantities, as used in the embodiment of the disclosure in order to achieve one or more of the intended objects or results of the present invention.

The description of the exemplary embodiments is intended to be read in conjunction with the accompanying drawings, which are to be considered part of the entire written description. In the description, relative terms such as “lower”, “upper”, “horizontal”, “vertical”, “above”, “below”, “up”, “down”, “top”, and “bottom” as well as derivatives thereof (e.g. “horizontally”, “downwardly”, “upwardly” etc.) should be construed to refer to the orientation as then described or as shown in the drawing under discussion.

These relative terms are for convenience of description and do not require that the corresponding apparatus or device be constructed or operated in a particular orientation. Terms concerning attachments, coupling and the like, such as “connected” and “interconnected”, refer to a relationship, wherein structures are secured or attached to one another either directly or indirectly through intervening structures, as well as both movable or rigid attachments or relationships, unless expressly described otherwise.