Patent Application
20180202588
The present disclosure relates generally to tube fittings in gas and plumbing and more specifically to an assembly of a tube and a fitting body and a method thereof,
A tube in gas and plumbing may be assembled with a valve in order to receive or supply a fluid or gas to the valve or may be assembled with another tube to provide an extension in overall length of the gas supply or plumbing. Atypical method of making such an assembly involves assembling the tube with a fitting body using a tube connector arrangement and then assembling the assembly of the tube and the fitting body to the valve or another assembly of the tube and the fitting body.
The tube connector arrangement typically includes a pair of ferrules and a compression nut. The purpose of the pair of ferrules is to provide leak proof metal to metal assembly between the tube and the filling body, while the compression nut serves the purpose of fastening the tube with the fitting body and holding the pair of ferrules in their places.
However, positioning of the first ferrule 1302 and the second ferrule 1304 is critical while making the assembly between the tube 110 and the fitting body 120. The first and the second ferrules 1302 and 1304 need to be positioned at an accurate depth with respect to the end 1102 of the tube 110. If the depth is too small there will not be enough area of the outer tube surface 1106 available to ensure that the first and the second ferrules 1302 and 1304 provide a proper sealing effect and that undue stresses are not generated at the first tube end 1102 due to compression action of the compression nut 1306. This leads to leaky assembly between the tube 110 and the fitting body 120 and/or damaged first tube end 1102. If the depth is too large, there will not be sufficient mating between the compression nut 1306 and the fitting body 120 to ensure a tight assembly. However, during fastening of the compression nut 1306 to the fitting body 120, the tube 110 is generally free to slide, making it difficult to accurately position the first and the second ferrules 1302 and 1304.
In the prior art, there are some solutions available to ensure that this positioning is accurately done. In one solution, a depth marking tool may be used to make a marking on the tube, corresponding to the position of the first ferrule 1302 and the second ferrule 1304 and the marking may then be referenced while the assembly of the tube 110 with the fitting body 120. However, the position with respect to the marking is difficult to maintain while making the assembly, as the tube is likely to slide up or down or sideways depending upon the orientation of the assembly.
Another solution included the use of a pre-swaging tool, that allows the first ferrule 1302 and the second ferrule 1304 to be pre-swaged to the tube 110, before the tube 110 is introduced to the fitting body 120. However, even in this case, there is disadvantage of having to perform an additional pre-swaging step. Especially, in field applications, where there is a need to make rapid assemblies on a large scale, the additional step of pre-swaging may cause significant delays and losses in terms of man-hours. Another disadvantage is that, once the first ferrule 1302 and the second ferrule 1304 have been pre-swaged to the tube 110, there is always of a possibility of the first and the second ferrules 1302, 1304 to get disturbed while removing the tube 110 from the pre-swaging tool or while transferring the tube 110 to the fitting body 120.
In light of the discussion above, there is clearly a need for an improved tube connector arrangement and a method for assembling a tube that overcome one or more of the above mentioned deficiencies.
According to a first aspect of the present disclosure, there is provided a method comprising fastening a position locator to an outer surface of a tube at a predetermined depth from a first end of a tube such that at least one ferrule abuts a flange of the position locator between the first end of the tube and the position locator, forming a tube connector assembly by introducing a compression nut such that an inner wail of the compression nut surrounds the position locator and the at least one ferrule, introducing a fitting body via the first end of the tube and fastening the tube connector assembly to the fitting body using a first threading on the inner wall of the compression nut and a second threading on an outer wall of the fitting body such that the at least one ferrule is between the compression nut and the fitting body. This way the position locator can be used to accurately position the at least one ferrule at the predetermined depth. The position locator prevents the at least one ferrule from getting displaced along the outer surface of the tube, and especially prevents the at least one ferrule from slipping in an opposite direction to a direction of the fitting body.
In accordance with an embodiment of the present disclosure, the tube connector assembly is formed before the position locator is fastened to the outer surface. This helps in deciding the number and types of ferrules to be used in the tube connector assembly depending upon the application and other factors such as safety, service life, reliability and durability desired for the tube connector assembly.
In accordance with an embodiment of the present disclosure, fastening the position locator to the outer surface of the tube comprises fastening the tube connector assembly such that the compression nut is temporarily fastened to a hollowed out portion of an assembly jig, the assembly jig comprising the hollowed out portion at one end that is wide enough to allow the tube to pass through and a shoulder portion at an opposite end that prevents the tube from passing through, inserting the first end of the tube into the tube connector assembly until the first end of the tube abuts the shoulder portion of the assembly jig and unfastening the assembly jig from the tube connector assembly. The assembly jig allows both the assembly of the tube and the tube connector assembly and also the positioning of the tube connector assembly with respect to the tube. The assembly jig further reduces number of steps required and/or parts required to assemble the tube connector assembly onto the tube.
In accordance with an embodiment of the present disclosure, when the tube connector assembly is fastened to the assembly jig, the distance between the shoulder portion of the assembly jig and the position locator is equivalent to the predetermined depth. This way an operator will not have to take special efforts to make sure that the position locator is located at the predetermined depth. In this manner, the assembly jig serves the purpose of both the assembly and the positioning of the tube connector assembly at the outer surface of the tube.
In accordance with an embodiment of the present disclosure, the assembly jig comprises a bolt type assembly jig, wherein the outer surface of the hollowed out portion is threaded to be temporarily fastened to the first threading on the inner wall of the compression nut. The bolt type assembly jigs are easy to use because of the threads present on the outer surface of the hollowed out portion. The compression nut can be easily fastened and unfastened from the outer surface of the hollowed out portion, just by using a simple tool such as a spanner. The threads provide a good compromise between strength of the fastening and convenience of use.
In accordance with an embodiment of the present disclosure, the assembly jig comprises a binder type assembly jig comprising a plurality of binders such that unfastening the assembly jig from the tube connector assembly comprises pressing the tube against the shoulder of the binder type assembly jig. This makes the binder type assembly jig is even more convenient to use as compared to the bolt type assembly jig and allows quick operations in scenarios such as production lines and field scenarios having harsh conditions and/or large scale installations, where an operator does not have a lot of time for assembling the tube connector assembly with the tube.
In accordance with an embodiment, fastening the position locator to the outer surface of the tube comprises coaxially introducing the position locator to the first end of the tube, inserting the first end of the tube into an elongate portion of a position locator guide until the first end of the tube abuts a cap of the position locator guide such that the position locator is pushed along the outer surface of the tube for the length of the elongate portion, the length of the elongate portion being equivalent to the predetermined depth and removing the tube from the position locator guide. The position locator guide provides the flexibility of using the position locator with any kind and number of ferrules. Also, the position locator guide is much simpler in design and construction allowing it to be produced rather cheaply and used pretty conveniently.
According to a second aspect of the present disclosure, there is provided an assembly for connecting tubes, the assembly comprising a tube connector assembly comprising a position locator having a hollow cylindrical shape and configured to be fastened to an outer surface of a tube at a predetermined depth from a first end of the tube, the position locator comprising a hole and an inner projection projecting inward from an inner surface of the position locator, the inner projection configured to prevent sliding of the position locator in at least one direction along the outer surface of the tube, at least one ferrule having a configured to be coaxially positioned against a first side of the position locator, and a compression nut configured to be coaxially positioned against a second side of the position locator opposite to the first side of the position locator, such that an inner wall of the compression nut having a threaded portion surrounds the position locator and the at least one ferrule and an assembly guide configured to position the position locator of the tube connector assembly, the assembly guide comprising a cavity portion and a shoulder portion such that when the assembly guide is engaged with the tube connector assembly and tube is inserted into a cavity of the compression nut through the position locator until the first end of the tube abuts the shoulder portion of the assembly guide, the length from the first end of the tube to the position locator is equivalent to the predetermined depth.
In accordance with an embodiment of the present disclosure, the assembly further comprises a fitting body configure to connect tubes, the fitting body comprising an outward threaded portion at each distal end configured to be fastened to the threaded portion of the inner wall of the compression nut such that the at least one ferrule and the position locator are between the compression nut and the fitting body.
In accordance with an embodiment of the present disclosure, the assembly guide further comprises a cap at one end of the cavity portion, the cavity portion of the assembly guide having a substantially cylindrical elongated shape such that the shoulder portion is at the end of the cavity portion where the cap is located.
In accordance with an embodiment of the present disclosure, the assembly guide is a bolt type assembly jig, wherein the outer wall of the cavity portion is threaded to be temporarily fastened to the threaded portion of the compression nut.
In accordance with an embodiment of the present disclosure, the assembly guide is a binder type assembly jig comprising a plurality of binders to temporarily fasten the assembly guide to the compression nut of the tube connector assembly.
In accordance with an embodiment of the present disclosure, the position locator comprises an outer projection projecting outward from an outer surface, the outer projection configured to fasten the position locator to the at least one ferrule.
According to a third aspect of the present disclosure, there is provided combination ferrule for use in a tube connector arrangement, the combination ferrule comprising a ferrule portion that includes a flange portion at an end of the ferrule portion; and a holding ring portion comprising one or more elastic projections extending coaxially from an inner wall of the flange portion.
In accordance with an embodiment of the present disclosure, the ferrule portion and the holding ring portion are formed integrally as a single unit.
In accordance with an embodiment of the present disclosure, the ferrule portion and the holding ring portion are separate units, the ferrule portion comprising a ferrule groove, and the holding ring portion comprising a first extended surface at one end of the hold ring portion and a second extended surface comprising the one or more elastic projections, the first extended surface configured to engage with the ferrule groove to form the combination ferrule.
In accordance with an embodiment of the present disclosure, the ferrule portion and the holding ring portion are composed of different materials.
In accordance with an embodiment of the present disclosure, the ferrule portion is composed of metal and the holding ring portion is composed of a polymer.
In accordance with an embodiment of the present disclosure, the one or more elastic projections are disposed at an angle and configured to allow a tube enter through the holding ring and pass through the combination ferrule only in a first direction toward the ferrule portion and prevent the tube from moving in a second direction opposite to the first direction.
In accordance with an embodiment of the present disclosure, the one or more elastic projections are configured to engage with a notch in a cavity of a compression nut such that the flange portion abuts the notch and the combination ferrule is fastened in the cavity of the compression nut.
So that the manner in which the above recited features of the present disclosure can be understood in detail, a more particular description of the disclosure, briefly summarized above, may have been referred by embodiments, some of which are illustrated in the appended drawings. It is to be noted, however, that the appended drawing illustrate only typical embodiments of this disclosure and are therefore not to be considered limiting of its scope, for the disclosure may admit to other equally effective embodiments.
These and other features, benefits, and advantages of the present disclosure will become apparent by reference to the following text figure, with like reference numbers referring to like structures across the views, wherein:
The following definitions are provided as general definitions and should in no way limit the scope of the present disclosure to those terms alone, but are put forth for a better understanding of the following description.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the art to which the disclosure belongs, it will be further understood that terms used herein should be interpreted as having a meaning that is consistent with their meaning in the context of this specification and the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein. For the purposes of the present disclosure, additional terms are defined below. Furthermore, all definitions, as defined and used herein, should be understood to control over dictionary definitions, definitions in documents incorporated by reference, and/or ordinary meanings of the defined terms unless there is doubt as to the meaning of a particular term, in which case the common dictionary definition and/or common usage of the term will prevail.
For the purposes of the present disclosure, the following terms are defined below.
In the context of the specification, a “polymer material” is any naturally occurring or man-made material having long chains of organic molecules (eight or more organic molecules), with physical and chemical properties of such organic molecules giving the material its desired properties.
In the context of the specification, a “tube” is a hollow conduit meant for supply of fluids. The tube may be made up of, but not limited to, any suitable metallic material, polymer material or a composite material. Further, the tube may have a substantially circular cross section.
In the context of the specification, “temporary fastening” may be achieved by using any of the easily removable or replaceable fasteners such as, but not limited to, screws, bolts, clips, snaps and hooks etc.
In the context of the specification, “permanent fastening” may be achieved using fasteners which are relatively difficult to replace such as rivets or adhesives etc.
In the context of the specification, a “fitting body” is a hollow body member made up of metal, polymer material or a composite material. The fitting may have fastening arrangements such as threads at its two ends. Fastening arrangements allow the fitting body to act as an interface while connecting the tube to another component such as a service valve or another tube in the plumbing or gas supply. According to an embodiment, the fastening arrangements of the fitting body may have a predetermined length to correspond to a particular tube connector assembly.
In the context of the specification, a “ferrule” is a adapted to be provided coaxially at an outer tube surface of the tube. According to an embodiment, the ferrule may have a substantially conical shape and/or a substantially conical portion. In an embodiment the ferrule may have a substantially cylindrical shape with a tapered portion. Under compression, the ferrule may engage with the outer tube surface to provide a leak proof sealing between the tube and the fitting body, while assembling the tube with the fitting body.
In the context of the specification, a “compression nut” is a nut with an inner diameter being slightly greater than largest diameter of the ferrule. The compression nut is provided with threads on inner surface of the compression nut. The threads allow the nut to be fastened to the fitting body in order to compress the ferrule(s) for providing a leak proof assembly between the tube and the fitting body.
In the context of the specification, a “position locator” is a hollow cylindrical component, with a very small thickness compared to length of the tube. The position locator is adapted to be coaxially fastened with the outer tube surface of the tube, at a predetermined depth from an end of the tube. The fastening may be temporary or permanent. The position locator is adapted prevent the ferrule(s) from sliding along the tube, in a direction opposite to a direction of assembly of the tube with the fitting body.
In the context of the specification, a “position locator guide” is a component adapted to locate the position locator at a predetermined depth from an end of the tube,
While the present disclosure is described herein by way of example using embodiments and illustrative drawings, those skilled in the art will recognize that the disclosure is not limited to the embodiments of drawing or drawings described, and are not intended to represent the scale of the various components. Further, some components that may form a part of the disclosure may not be illustrated in certain figures, for ease of illustration, and such omissions do not limit the embodiments outlined in any way. It should be understood that the drawings and detailed description thereto are not intended to limit the disclosure to the particular form disclosed, but on the contrary, the disclosure is to cover all modifications, equivalents, and alternatives falling within the scope of the present disclosure as defined by the appended claim. As used throughout this description, the word “may” is used in a permissive sense (i.e. meaning having the potential to), rather than the mandatory sense, (i.e. meaning must). Furthermore, the terminology and phraseology used herein is solely used for descriptive purposes and should not be construed as limiting in scope. Language such as “including,” “comprising,” “having,” “containing,” or “involving,” and variations thereof, is intended to be broad and encompass the subject matter listed thereafter, equivalents, and additional subject matter not recited, and is not intended to exclude other additives, components, integers or steps. Likewise, the term “comprising” is considered synonymous with the terms “including” or “containing” for applicable legal purposes. Any discussion of documents, acts, materials, devices, articles and the like is included in the specification solely for the purpose of providing a context for the present disclosure. It is not suggested or represented that any or all of these matters form part of the prior art base or were common general knowledge in the field relevant to the present disclosure.
In this disclosure, whenever a composition or an element or a group of elements preceded with the transitional phrase “comprising”, it is understood that we also contemplate the same composition, element or group of elements with transitional phrases “consisting of”, “consisting”, “selected from the group of consisting of, “including”, or “is” preceding the recitation of the composition, element or group of elements and vice versa.
The present disclosure is described hereinafter by various embodiments with reference to the accompanying drawing, wherein reference numerals used in the accompanying drawing correspond to the like elements throughout the description. This disclosure may, however, be embodied in many different forms and should not be construed as limited to the embodiment set forth herein. Rather, the embodiment is provided so that this disclosure will be thorough and complete and will fully convey the scope of the disclosure to those skilled in the art. In the following detailed description, numeric values and ranges are provided for various aspects of the implementations described. These values and ranges are to be treated as examples only, and are not intended to limit the scope of the claims. In addition, a number of materials are identified as suitable for various facets of the implementations. These materials are to be treated as exemplary, and are not intended to limit the scope of the disclosure.
Referring to the drawings, the disclosure will now be described in more detail.
In another embodiment, the inner position locator surface 2312 is an expandable surface. Further, inner diameter of the position locator 2308 is smaller than diameter of the outer tube surface 2106 of the tube 210. So when, the position locator 2308 is introduced to the tube 210, the inner position locator surface 2312 is expanded to move the position locator 2308 along length of the tube 210. At the predetermined depth, the inner position locator surface 2312 is released, such that, the inner position locator surface 2312 contracts to engage with the outer tube surface 2106 of the tube 210. It would be appreciated by a person skilled in the art, that the fastening means 2310 is not limited to the embodiments discussed above but also may include any such means capable of either temporarily or permanently fastening the position locator 2308 to the outer tube surface 2106 of the tube 210. Further, the position locator 2308 has a position locator flange 2314 adapted to receive one or more of the first ferrule 2302 and the second ferrule 2304.
In accordance with an embodiment, the second fastening means 3104 includes one or more second elastic projections projecting outwards from the position locator flange 2314 and adapted to elastically grip the ferrule member 3102. Correspondingly, to accommodate the second fastening means 3104, an end of the ferrule member 3102 has been shaped to be received into the one or more second elastic projections. In accordance with another embodiment, the second fastening means 3104 includes plurality of holes provided in the position locator flange 2314, the plurality of holes being adapted to receive a plurality of threaded fasteners in order to fasten the ferrule member 3102 to the position locator 2308. Correspondingly, the second fastening means 3104 further includes a plurality of respective threaded holes provided at the end of the ferrule member 3102 in order to receive the plurality of fasteners through the position locator flange 2314.
In accordance with an embodiment of the present disclosure, the ferrule 904 includes a flange portion 907. The flange portion 907 is adapted to abut a notch portion 2308 of the compression nut 2306 when the combination ferrule 902 and the compression nut 2306 are engaged.
The holding ring 1006 includes the first extended surface 1064 and a second extended surface 1065. The holding ring 1006 serves the same function as the holding ring 906 and fastening means 2310 (and may also be implemented using the same form) in temporarily or permanently fastening to the outer tube surface 2106 of the tube 210. The first extended surface 1064 is located at a first end of the holding ring 1006 and adapted to securely interface with the ferrule groove 1042 of the ferrule 1004. The second extended surface 1065 is located at a second end opposite to the first end and adapted to extend and grip the outer tube surface 2106 of the tube 210. In an embodiment, the first extended surface may also be similarly adapted to extend and grip the outer tube surface 2106 of the tube 210. According to an embodiment, the tube 210 may enter through the second extended surface 1065 and continue sliding through the holding ring 1006 only one way toward the first end but not back out. Similar to the fastening means 2310 and the holding ring 906, the second extended surface 1065 includes one or more elastic projections projecting coaxially from the first extended surface 1064. The one or more elastic projections may be composed of any material according to desired elastic properties, such as metal, plastic, or rubber. In
In an embodiment, the ferrule 1004 may be composed of a rigid material such as a hard metal or a composite while the holding ring 1006 is composed of an elastic material such as plastic or rubber. In another embodiment, both the ferrule 1004 and the holding ring 1006 may be composed of the same material or of different materials that are both rigid or both elastic. According to an embodiment, the holding ring 1006 may be an elastic band made up of a polymer material. The elastic band expands while the holding ring 1006 is first introduced to the outer tube surface 2106 of the tube 210 and grips the outer tube surface 2106 as the tube 210 is slid through the tube connector arrangement 230.
As can be seen in
According to an embodiment, the ferrule 1004 and the holding ring 1006 are first engaged to form the combination ferrule 1002, such that the ferrule groove 1042 is securely engaged with the first extended portion 1064 of the holding ring 1006. The combination ferrule 1002 is then securely inserted into the compression nut 2306 such that the flange portion 1047 abuts the notch portion 2308, and the notch portion 2308 holds the combination ferrule 1002 in place by securing the second extended surface 1065 in place.
According to another embodiment, the ferrule holding ring 1006 may first be securely inserted into the compression nut 2306 such that the notch portion 2308 secures the second extended surface 1065 of the holding ring 1006 in place before the ferrule 1004 is also inserted and securely engaged with the holding ring 1006 such that the flange portion 1047 of the ferrule 1004 abuts the notch portion 2308 of the compression nut 2306, and the ferrule groove 1042 is securely engaged with the first extended portion 1064 of the holding ring 1006 to prevent the combination ferrule 1002 from falling or sliding out of the compression nut 2306.
Furthermore, according to an embodiment, the fitting body 220 (or the like) also engaged with the tube connector arrangement 230, before the tube 210 is inserted. As illustrated in the magnified view in
According to an embodiment, the assembly of the combination ferrule 1002, comprising the ferrule 1004 and the holding ring 1006, is able to position and hold both the tube 210 and the compression nut 2306 to form the tube connector arrangement 230. In an embodiment, the tube 210 may be inserted through the tube connector arrangement 230 after the fitting body 220 or the like is already engaged with the tube connector arrangement 230 such that the tube 210 is inserted at a depth controlled by the fitting body 220 or the like. This way an additional step of bringing the compression nut 2036 to the desired position, during the assembly of the tube 210 with the fitting body 220, is eliminated. Hence, the assembly process is simpler, faster and less error prone.
The present disclosure provides a number of advantages. First since, the position locator 2308 or the combination ferrule 310 are either temporarily or permanently fastened to the outer tube surface 2106, the first ferrule 2302 and the second ferrule 2304 are not displaced from their positions in a direction opposite to the assembly the tube 210 with the fitting body 220. Further, the combination ferrule 310 ensures that minimal number of parts are used, thus overall cost is reduced and a possibility of parts getting misplaced is minimized. Further, the position locator guide 240 allow the position locator 2308 to be accurately located along the outer tube surface 2106. Also, the bolt type assembly jig 410 and the binder type assembly jig 510 allow the combination ferrule 310 to be accurately located along the outer tube surface 2106. Additionally the holding ring 906 (or 1006) allows the compression nut 2306 to be positioned and held in a predetermined position before and during engagement with the tube 210 and the fitting body 220.
Various modifications to these embodiments are apparent to those skilled in the art from the description and the accompanying drawings. The principles associated with the various embodiments described herein may be applied to other embodiments. Therefore, the description is not intended to be limited to the embodiments shown along with the accompanying drawings but is to be providing broadest scope of consistent with the principles and the novel and inventive features disclosed or suggested herein. Accordingly, the disclosure is anticipated to hold on to all other such alternatives, modifications, and variations that fall within the scope of the present disclosure and appended claim.
| Number | Date | Country | |
|---|---|---|---|
| Parent | 15407068 | Jan 2017 | US |
| Child | 15443812 | US |
