FORM-2
THE PATENTS ACT, 1970
(39 of 1970)
&
THE PATENTS RULES, 2003
COMPLETE SPECIFICATION
(See section 10 and rule 13)
HIGH TORQUE RESISTANT LOCKING SYSTEM
FINOLEX INDUSTRIES LIMITED
an Indian Company,
of,Block D-l Plot nolO, M.I.D.C,
Chinchwad, Pune-411 019
Maharashtra, India.
Inventor: SONAWANE Arun Harischandra
THE FOLLOWING SPECIFICATION PARTICULARLY DESCRIBES THE NATURE OF THE INVENTION AND THE MANNER IN WHICH IT IS TO BE PERFORMED.

FIELD OF DISCLOSURE
The present disclosure relates to a coupling for tubular elements, more particularly, the present disclosure relates to a coupling for connecting tubular elements for configuring a fluid flow conduit for transportation of pressurized fluid.
BACKGROUND
A bore-well system includes a submersible pump submerged in ground water that is to be pumped to the ground level and a fluid flow conduit for delivering the ground water pumped by the submersible pump outside the bore-well. The fluid flow conduit for delivering the ground water pumped by the submersible pump is generally configured by connecting a plurality of metal pipes also referred to as column pipes. Each of the column pipes, connected with each other for configuring the fluid flow conduit is generally having a length of about 3m. The submersible pump submersed in the ground water is connected to an operative bottom of the fluid flow conduit configured by connecting the column pipes. The fluid flow conduit formed by connecting the column pipes is encased within a casing structure formed by joining a plurality of casing pipes. The casing structure ensures protection of the fluid flow conduit from detrimental environmental conditions inside the ground. The fluid flow conduit for delivering the ground water pumped by the submersible pump is generally formed by connecting the plurality of metal pipes as the fluid flow conduit has to withstand high fluid pressures. However, the metal pipes are prone to corrosion and require frequent maintenance. Further, the corroded particles may pollute the fluid flowing through the metal pipes. Further, the bore-well system with fluid flow conduit formed by connecting metal pipes is expensive. Instead of metal pipes, PVC pipes can also be used for configuring the fluid flow conduit. However, the fluid flow conduit formed by connecting the PVC

pipes are weak at the joints and fails to withstand high pressure of the fluid flowing through the conduit.
Accordingly, there is a need for a reliable coupling for connecting the PVC pipes configuring the fluid flow conduit for transportation of pressurized fluid that can withstand high pressure of the fluid flowing through the conduit. Further, there is a need for a coupling for connecting tubular elements for configuring a fluid flow conduit for transporting pressurized fluid that is simple in construction, cost effective and convenient to use. Furthermore, there is a need for a coupling for connecting tubular elements for configuring a fluid flow conduit for transporting pressurized fluid there-through that is economical, effective and reliable. Still further, there is a need for a coupling for connecting tubular elements for configuring a conduit that can be used for easily and conveniently assembling the conduit by coupling the tubular elements.
OBJECTS
Some of the objects of the present disclosure are described herein below:
It is an object of the present disclosure to ameliorate one or more problems of the prior art or to at least provide a useful alternative.
An object of the present disclosure is to provide a reliable coupling for connecting PVC pipes configuring a fluid flow conduit for transportation of pressurized fluid.
Another object of the present disclosure is to provide a coupling for connecting PVC pipes configuring a fluid flow conduit that can withstand high pressure of fluid flowing through the conduit.

Still another object of the present disclosure is to provide a coupling for securely connecting PVC pipes configuring a fluid flow conduit that can withstand tensile forces and maintain secure engagement between the PVC pipes connected thereby.
Yet another object of the present disclosure is to provide a coupling for connecting tubular elements for configuring a conduit for transporting pressurized fluid that is simple in construction.
Still another object of the present disclosure is to provide a coupling for connecting tubular elements configuring a fluid flow conduit that is cost effective.
Another object of the present disclosure is to provide a coupling for connecting tubular elements, wherein once assembled by the coupling the tubular elements cannot be di-assembled without breaking or damaging the coupling element.
Another object of the present disclosure is to provide a coupling for connecting tubular elements configuring a fluid flow conduit that is convenient to use.
Yet another object of the present disclosure is to provide a coupling for connecting tubular elements configuring a fluid flow conduit that exhibits enhanced service life.
Still another object of the present disclosure is to provide a coupling for connecting tubular elements that requires fewer parts for configuring connection between the tubular elements and that requires less maintenance as compared to conventional coupling.

Yet another object of the present disclosure is to provide a coupling for connecting tubular elements that requires comparatively less efforts for assembly of the tubular elements for configuring the fluid flow conduit.
SUMMARY
A coupling for connecting tubular elements configuring a fluid flow conduit for transporting pressurized fluid is disclosed in accordance with an embodiment of the present disclosure. The coupling includes a coupling element and at least a pair of pre-formed insert element. The opposite ends of the coupling element receive and threadably engage with a first tubular element and a second tubular element respectively for configuring connection between the tubular elements. The coupling element is having holes configured thereon and the tubular elements are having complimentary recesses configured thereon, wherein at least one hole configured on the coupling element registers with at least one complimentary recess configured on a corresponding tubular element for configuring a passageway extending through the coupling element and at least partially extending through the corresponding tubular element. Each of the preformed insert elements is press-fitted in a corresponding passageway for configuring an interference fit between the pre-formed insert element and the passageway for reinforcing the connection between the coupling element and the corresponding tubular element.
Typically, the holes configured on the coupling element are disposed diametrically opposite to each other.
Similarly, the recesses configured on each of the tubular elements are disposed diametrically opposite to each other and radially extend at least partially through thickness of said tubular elements.

Typically, the pre-formed insert element is of brass material.
Preferably, the tubular elements are of Poly-Vinyl- Chloride (PVC) material.
Generally, ends of the pre-formed insert element press-fitted in the passageway are grinded so that profile at ends of said pre-formed insert element conforms to concavity of the outer surface of the coupling element.
Typically, holes configured on said coupling element and the complimentary recesses configured on the tubular elements are formed by drilling.
In accordance with an embodiment, the pre-formed insert element is having diameter of 6mm and the passageway extending through the coupling element and at least partially extending through the corresponding tubular element is having a diameter of 5mm.
A method for configuring coupling between tubular elements configuring a fluid flow conduit is disclosed in accordance with an embodiment of the present disclosure. The method for configuring coupling between tubular elements include the steps of receiving and threadably engaging a first tubular element and a second tubular element within opposite ends of a coupling element for configuring connection between the tubular elements, registering at least one hole configured on the coupling element with at least one hole configured on a corresponding tubular element for configuring a passageway extending through the coupling element and at least partially extending through the corresponding tubular element and press-fitting each one of pre-formed insert element inside a corresponding passageway for configuring an interference fit between the preformed insert element and the passageway for reinforcing the connection between the coupling element and the corresponding tubular element.

Further, the method for configuring coupling between tubular elements further includes the step of grinding the ends of the pre-formed insert element after the pre-formed insert element is press-fitted in the corresponding passageway so that profile at the ends of the pre-formed insert element conforms to concavity of the outer surface of the coupling element.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS:
The objects and features of the present disclosure will be more clearly understood from the following description of the disclosure taken in conjunction with the accompanying drawings, in which,
Figure 1 illustrates a schematic representation of a cut section of a coupling in accordance with an embodiment of the present disclosure, wherein a coupling element connects a first PVC pipe and a second PVC pipe and a plurality of PVC pipes connected to each other by using the coupling configure a fluid flow conduit or a column pipe of a bore-well system;
Figure 2 illustrates another schematic representation of cut section of the coupling of Figure 1;
Figure 3 illustrates a schematic representation illustrating the coupling of Figure 1 and Figure 2, wherein a pre-formed insert element is press-fitted into a corresponding passageway extending through the coupling element and at least partially extending through a corresponding tubular element for reinforcing the connection between the coupling element and the corresponding tubular element.

DETAILED DESCRIPTION
The present disclosure will now be described with reference to the accompanying drawings which do not limit the scope and ambit of the present disclosure. The description provided is purely by way of example and illustration.
The embodiments herein and the various features and advantageous details thereof are explained with reference to the non-limiting embodiments in the following description. Descriptions of well-known components and processing techniques are omitted so as to not unnecessarily obscure the embodiments herein. The examples used herein are intended merely to facilitate an understanding of ways in which the embodiments herein may be practiced and to further enable those of skill in the art to practice the embodiments herein. Accordingly, the examples should not be construed as limiting the scope of the embodiments herein.
The present disclosure envisages a reliable coupling for connecting PVC pipes, also referred to as column pipes, wherein a plurality of PVC pipes are connected to each other for configuring a fluid flow conduit for transportation of pressurized fluid. More specifically, the coupling connects PVC pipes for configuring the fluid flow conduit connecting a submersible pump submersed in the ground water to an outlet disposed outside the bore-well for facilitating delivering of the high pressure ground water pumped by the submersible pump outside the bore-well. Each of the column pipes, connected with each other for configuring the fluid flow conduit is generally having a length of about 3m. The submersible pump is generally connected to an operative bottom of the fluid flow conduit configured by connecting the column pipes. More specifically, the submersible pump is connected to the bottom most column pipe. As the fluid

flow conduit has to handle high pressure fluid, the coupling should be capable of withstanding high loads and maintain integrity of the fluid flow conduit. The coupling can withstand high pressure of fluid flowing through the conduit and can withstand tensile forces and maintain secure engagement between the PVC pipes connected thereby.
Figure 1 illustrates a schematic representation of a cut section of a coupling 100 in accordance with an embodiment of the present disclosure. Figure 2 illustrates another schematic representation of cut section of the coupling 100. The coupling 100 includes a coupling element 10 and at least a pair of pre-formed insert element 30a, 30b, wherein the coupling element 10 connects a first PVC pipe 20a and a second PVC pipe 20b for configuring a fluid flow conduit or a column pipe of a bore-well system. More specifically, the opposite ends of the coupling element 10 receives and threadably engages with the first tubular element 20a and the second tubular element 20b respectively for configuring connection between the tubular elements 20a and 20b. The opposite ends of the coupling element 10 have threads 10a configured on inner periphery thereof that engages with the complimentary threads configured on the outer periphery of the tubular elements 20a and 20b for facilitating threadable engagement between the coupling element 10 and the tubular elements 20a and 20b. The coupling element 10 is having holes configured thereon and the tubular elements 20a and 20b are having recesses configured thereon that extend at least partially through thickness of the tubular elements 20a and 20b. The holes configured on the coupling element 10 are complimentary to the corresponding recesses configured on the tubular elements 20a and 20b, wherein at least one hole configured on the coupling element 10 registers with at least one recess configured on a corresponding tubular element for configuring a passageway extending through the coupling element 10 and at least partially extending through the corresponding tubular element. In accordance with a preferred

embodiment, the holes configured on the coupling element 10 are disposed diametrically opposite to each other. Also, the recesses configured on each of the tubular elements 20a and 20b are disposed diametrically opposite to each other. The holes configured on the coupling element 10 and the recesses configured on the tubular elements 20a and 20b are formed by drilling. However, the present disclosure is not limited to any particular method for configuring holes on the coupling element 10 and the tubular elements 20a and 20b.
Figure 3 illustrates a schematic representation illustrating the coupling 100, wherein a pre-formed insert element is press-fitted into a corresponding passageway extending through the coupling element 10 and at least partially extending through a corresponding tubular element 20a, 20b for reinforcing the connection between the coupling element 10 and the corresponding tubular elements 20a and 20b. Each one of the pre-formed insert elements 30a and 30b is press-fitted in a corresponding passageway for configuring an interference fit between the pre-formed insert element 30a, 30b and the corresponding passageway for reinforcing the connection between the coupling element 10 and the corresponding tubular element. The pre-formed insert element is of brass material. The pre-formed insert element, also referred to as brass insert or brass pin rivet is having dimension greater than the dimension of the passageway in which it is press-fitted by hammering. The pre-formed insert element is hammered to configure press fit connection between the pre-formed insert element and the the corresponding passageway. In accordance with an embodiment, in case the coupling is used for connecting tubular elements, particularly, PVC standard pipes 20a and 20b of length 3m each and mean diameter of about 2 inches, then the coupling element 10 is having internal configured threads for facilitating threadable engagement of the pipes 20a and 20b with the coupling element 10 and a pair of pre-formed insert element 30a,

30b, wherein each pre-formed insert element is having diameter of 6mm and is press-fitted in a corresponding passageway having diameter less than 6mm that extends through the coupling element 10 and at least partially extends through the corresponding tubular element for configuring an interference fit between the pre-formed insert element 30a, 30b and the corresponding passageway for reinforcing the connection between the coupling element 10 and the corresponding tubular element. In accordance with one embodiment, if the preformed insert element is having diameter of 6mm, then the passageway extending through the coupling element and at least partially extending through the corresponding tubular element is having a diameter of 5mm. More specifically, the pre-formed insert element is of brass and is having dimension of 6mm X 12.5 mm. The coupling can withstand tensile loads of about 45 MPA.
The brass pin rivet is serving as a continuous structural beam subjected to Uniformly Distributed Loading (UDL) throughout it's length. Such a configuration of the coupling 100 imparts comparatively higher torque resistance and higher mechanical strength to the coupling than conventionally known couplings. The brass pin rivet is subjected to Shear Force (SF) and Bending Moment (BM) due to the total weight of the column and subsequently provides extra mechanical strength to the square threaded joint or coupling. Further, with such a configuration of the coupling 100 for connecting tubular elements for configuring the column pipe, the column pipe experiences lowest possible vibration (almost zero) with superior strength during service. With use of brass corrosion is avoided, thereby substantially increasing the service life of the coupling and eliminating drawbacks associated with corrosion. The brass pin rivet locks any movement of the tubular elements joined by the coupling 100. The brass pin rivet is configured by considering the maximum shear force (SF) and bending moment (BM) experienced by the brass pin rivet and also considering suitable factor of safety. However, the coupling 100 of the present

disclosure is not limited to a particular material used for configuring the preformed insert element. The ends of the pre-formed insert element press-fitted in the corresponding passageway are grinded so that profile at ends of the preformed insert element conforms to concavity of the outer surface of the coupling element.
A method for configuring coupling between tubular elements 20a, 20b configuring a fluid flow conduit is disclosed in accordance with an embodiment of the present disclosure. The method for configuring the coupling 100 between tubular elements 20a and 20b include the steps of receiving and threadably engaging a first tubular element 20a and a second tubular element 20b within opposite ends of a coupling element 10 for configuring connection between the tubular elements 20a and 20b, registering at least one hole configured on the coupling element with at least one recess configured on a corresponding tubular element for configuring a passageway extending through the coupling element 10 and at least partially extending through the corresponding tubular element and press-fitting each of the pre-formed insert element inside a correponding passageway for configuring an interference fit between the pre-formed insert element and the passageway for reinforcing the connection between the coupling element and the corresponding tubular element.
TECHNICAL ADVANCEMENTS
The coupling for connecting tubular elements configuring a fluid flow conduit in accordance with the present disclosure has several technical advantages including but not limited to the realization of:
• a reliable coupling for connecting PVC pipes configuring a fluid flow conduit for transportation of pressurized fluid;

• a coupling for connecting PVC pipes configuring a fluid flow conduit that can withstand high pressure of fluid flowing through the conduit;
• a coupling for securely connecting PVC pipes configuring a fluid flow conduit that can withstand tensile forces and maintain secure engagement between the PVC pipes connected thereby;
• a coupling for connecting tubular elements for configuring a conduit for transporting pressurized fluid that is simple in construction;
• a coupling for connecting tubular elements configuring a fluid flow conduit that is cost effective;
• a coupling for connecting tubular elements, wherein once assembled by the coupling the tubular elements cannot be di-assembled without breaking or damaging the coupling element;
• a coupling for connecting tubular elements configuring a fluid flow conduit that is convenient to use;
• a coupling for connecting tubular elements that requires fewer parts for configuring connection between the tubular elements and that requires less maintenance as compared to conventional coupling;
• a coupling for connecting tubular elements configuring a fluid flow conduit that exhibits enhanced service life; and
• a coupling for connecting tubular elements that requires comparatively less efforts for assembly of the tubular elements for configuring the fluid flow conduit.
Throughout this specification the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element, integer or step, or group of elements, integers or steps, but not

the exclusion of any other element, integer or step, or group of elements, integers or steps.
The use of the expression "at least" or "at least one" suggests the use of one or more elements or ingredients or quantities, as the use may be in the embodiment of the disclosure to achieve one or more of the desired objects or results.
Any discussion of documents, acts, materials, devices, articles or the like that has been included in this specification is solely for the purpose of providing a context for the disclosure. It is not to be taken as an admission that any or all of these matters form a part of the prior art base or were common general knowledge in the field relevant to the disclosure as it existed anywhere before the priority date of this application.
The numerical values mentioned for the various physical parameters, dimensions or quantities are only approximations and it is envisaged that the values higher/lower than the numerical values assigned to the parameters, dimensions or quantities fall within the scope of the disclosure, unless there is a statement in the specification specific to the contrary.
While considerable emphasis has been placed herein on the specific features of the preferred embodiment, it will be appreciated that many additional features can be added and that many changes can be made in the preferred embodiment without departing from the principles of the disclosure. These and other changes in the preferred embodiment of the disclosure will be apparent to those skilled in the art from the disclosure herein, whereby it is to be distinctly understood that the foregoing descriptive matter is to be interpreted merely as illustrative of the disclosure and not as a limitation.

WE CLAIM:
1. A coupling for connecting tubular elements for configuring a fluid flow conduit for transporting pressurized fluid, said coupling comprising:
• a coupling element, opposite ends of said coupling element adapted to receive and threadably engage with a first tubular element and a second tubular element respectively for configuring connection between said tubular elements, said coupling element is having holes configured thereon and said tubular elements are having complimentary recesses configured thereon, wherein at least one hole configured on said coupling element adapted to register with at least one complimentary recess configured on a corresponding tubular element for configuring a passageway extending through said coupling element and at least partially extending through said corresponding tubular element; and
• at least a pair of pre-formed insert elements, each of said preformed insert element adapted to be press-fitted in a corresponding passageway for configuring an interference fit between said preformed insert element and said passageway for reinforcing connection between said coupling element and said corresponding tubular element.

2. The coupling for connecting tubular elements as claimed in Claim 1, wherein said holes configured on said coupling element are disposed diametrically opposite to each other.
3. The coupling for connecting tubular elements as claimed in Claim 1, wherein said recesses configured on each of said tubular elements are disposed diametrically opposite to each other and radially extend at least partially through thickness of said tubular elements.

4. The coupling for connecting tubular elements as claimed in Claim 1, wherein said pre-formed insert element is of brass material.
5. The coupling for connecting tubular elements as claimed in Claim 1, wherein said tubular elements are of Poly-Vinyl- Chloride (PVC) material.
6. The coupling for connecting tubular elements as claimed in Claim 1, wherein ends of said pre-formed insert element press-fitted in said passageway are adapted to be grinded so that profile at ends of said preformed insert conforms to concavity of said outer surface of said coupling element.
7. The coupling for connecting tubular elements as claimed in Claim 1, wherein said holes configured on said coupling element and said complimentary recesses configured on said tubular elements are formed by drilling.
8. The coupling for connecting tubular elements as claimed in Claim 1, wherein, said pre-formed insert element is having diameter of 6mm and said passageway extending through the coupling element and at least partially extending through the corresponding tubular element is having a diameter of 5mm.
9. A method for configuring coupling between tubular elements configuring a fluid flow conduit for transporting pressurized fluid comprising the following steps:

• receiving and threadably engaging a first tubular element and a second tubular element within opposite ends of a coupling element for configuring connection between said tubular elements;
• registering at least one hole configured on said coupling element with at least one complimentary recess configured on a corresponding tubular element for configuring a passageway

extending through said coupling element and at least partially extending through said corresponding tubular element; and • press-fitting a pre-formed insert element inside a corresponding passageway for configuring an interference fit between said preformed insert element and said passageway for reinforcing the connection between said coupling element and said corresponding tubular element. 10. The method for configuring coupling between tubular elements as claimed in Claim 8, further comprises the step of grinding the ends of the pre-formed insert after said pre-formed insert element is press-fitted in said passageway so that profile at ends of said pre-formed insert element conforms to concavity of said outer surface of said coupling element.