Patent Application
20170261137
The present disclosure relates to fittings for making mechanically attached connections between a conduit and another fluid component, for containing liquid or gas fluids. More particularly, the disclosure relates to fittings for tube and pipe conduits that use one or more conduit gripping devices, such as for example, one or more ferrules.
In accordance with an embodiment of one or more of the inventions presented in this disclosure, a fitting assembly for conduits includes first and second fitting components, at least one conduit gripping device, and a retaining member assembled with the first fitting component to retain the at least one conduit gripping device with the first fitting component as a subassembly prior to the first and second fitting components being assembled together. When the first fitting component is assembled with the second fitting component, the second fitting component engages the retaining member to axially move the retaining member into axial alignment with a recessed portion of an interior wall of the first fitting component, thereby allowing the retaining member to be received in the recessed portion and radially separate from a frustoconical outer radial portion of the at least one conduit gripping device, to permit disassembly of the first fitting component from the at least one conduit gripping device. Prior to the first and second fitting components being assembled together, the outer radial portion of the at least one conduit gripping device blocks axial movement of the retaining member into axial alignment with the recessed portion of the interior wall.
In accordance with an embodiment of one or more of the inventions presented in this disclosure, a fitting assembly for conduits includes a first fitting component, a second fitting component that assembles with the first fitting component, at least one conduit gripping device, and a retaining member assembled with the first fitting component and seated in a first circumferential recess in the first fitting component to engage an outer radial portion of the at least one conduit gripping device, to retain the at least one conduit gripping device with the first fitting component as a subassembly prior to the first and second fitting components being assembled together. When the first fitting component is assembled with the second fitting component, the second fitting component engages the retaining member to axially move the retaining member into axial alignment with a second circumferential recess in the first fitting component, the second circumferential recess extending radially outward of the first circumferential recess, thereby allowing the retaining member to be received in the second circumferential recess and radially separate from an outer radial portion of the at least one conduit gripping device, to permit disassembly of the first fitting component from the at least one conduit gripping device. The first circumferential recess is separated from the second circumferential recess by a wall portion extending radially inward from the first and second circumferential recesses, with one of an inboard surface of the wall portion and an outboard surface of the retaining member being ramped, such that axial movement of the retaining member against the wall portion causes the retaining member to radially compress to allow the retaining member to move axially outward of the wall portion and into the second recess.
In accordance with another embodiment of one or more of the inventions presented in this disclosure, a preassembly for a conduit fitting includes an annular fitting component having an interior wall extending along a central axis from an inboard end to an outboard end, a projection connected to and extending radially inward from the interior wall, and at least a first conduit gripping device retained within the annular fitting component and including an outer radial portion defining a circumferential recess receiving the projection between radially extending inboard and outboard ends of the outer radial portion, for axial retention of the first conduit gripping device in the annular fitting component. When an axial outward force is applied to the first conduit gripping device, engagement of the projection with the inboard end of the outer radial portion causes the projection to bend out of engagement with the circumferential recess, permitting removal of the first conduit gripping device from the annular fitting component.
In accordance with another embodiment of one or more of the inventions presented in this disclosure, a fitting assembly for conduits includes a first fitting component having an interior wall extending along a central axis from an inboard end to an outboard end, a second fitting component that assembles with the first fitting component, an annular retaining member received in a circumferential recess in the interior wall of the annular fitting component, at least one conduit gripping device, and a retaining member received in a circumferential recess in the interior wall of the annular fitting component, the retaining member retaining the at least one conduit gripping device with the first fitting component as a subassembly prior to the first and second fitting components being assembled together. When the first fitting component is assembled with the second fitting component, the second fitting component engages the retaining member to radially expand the retaining member further into the circumferential recess, such that the retaining member radially separates from an outer radial portion of the at least one conduit gripping device, to permit disassembly of the first fitting component from the at least one conduit gripping device.
In accordance with another embodiment of one or more of the inventions presented in this disclosure, a fitting assembly for conduits includes a first fitting component having an interior wall extending along a central axis from an inboard end to an outboard end, a second fitting component that assembles with the first fitting component, at least a first conduit gripping device disposed in the first fitting component and including a first, inboard circumferential recess and a second, outboard circumferential recess radially inward of the first circumferential recess, and an annular retaining member seated between the first circumferential recess of the first conduit gripping device and a circumferential recess in the first fitting component. When the first fitting component is pulled up on the second fitting component, the second fitting component engages the retaining member to axially move the retaining member from the first circumferential recess to the second circumferential recess, wherein the annular retaining member radially contracts to radially separate from the circumferential recess of the first fitting component, to permit disassembly of the first fitting component from the first conduit gripping device.
In accordance with another embodiment of one or more of the inventions presented in this disclosure, a fitting assembly for conduits includes a first fitting component having an interior wall extending along a central axis from an inboard end to an outboard end, a second fitting component that assembles with the first fitting component, a first conduit gripping device disposed in the first fitting component, a second conduit gripping device disposed in the first fitting component between the first conduit gripping device and an annular shoulder portion of the first fitting component, the second conduit gripping device being releasably cartridged with the first conduit gripping device, and an annular retaining member having an outer radial portion received in a circumferential recess in the interior wall of the first fitting component and an inner radial portion extending radially inward between the first conduit gripping device and the second conduit gripping device to retain the second conduit gripping device with the first fitting component, When the first fitting component is pulled up on the second fitting component, the second fitting component engages the annular retaining member to plastically bend the retaining member to a release position radially outward of the second conduit pipping device, to permit disassembly of the first fitting component from the second conduit gripping device.
In accordance with another embodiment of one or more of the inventions presented in this disclosure, a fitting assembly for conduits includes a first fitting component having an interior wall extending along a central axis from an inboard end to an outboard end, a second fitting component that assembles with the first fitting component, a first conduit gripping device disposed in the first fitting component, a second conduit gripping device disposed in the first fitting component between the first conduit gripping device and an annular shoulder portion of the first fitting component, the second conduit gripping device being releasably cartridged with the first conduit gripping device, and a retaining projection connected with an interior surface of the first fitting component and including an inner radial portion engaging an outer radial surface of the second conduit gripping device to retain the second conduit gripping device with the first fitting component. When the first fitting component is pulled up on the second fitting component, radial expansion of the outer radial surface of the second conduit gripping device bends the inner radial portion of the retaining projection radially outward to permit disassembly of the first fitting component from the second conduit gripping device.
In accordance with another embodiment of one or more of the inventions presented in this disclosure, a fitting assembly for conduits includes a first fitting component having an interior wall extending along a central axis from an inboard end to an outboard end, a second fitting component that assembles with the first fitting component, a first conduit gripping device disposed in the first fitting component, a second conduit gripping device disposed in the first fitting component between the first conduit gripping device and an annular shoulder portion of the first fitting component, the second conduit gripping device being releasably cartridged with the first conduit gripping device, and a retaining member having a first end hook portion engaging an interior notch portion of the second conduit gripping device and a second end hook portion engaging an interior recess in an outboard end portion of the first fitting component to retain the second conduit gripping device with the first fitting component. When the first fitting component is pulled up on the second fitting component, radial expansion of a rear portion of the second conduit gripping device causes the interior notch portion of the second conduit gripping device to disengage from the first end hook portion to permit disassembly of the first fitting component from the second conduit gripping device.
In accordance with another embodiment of one or more of the inventions presented in this disclosure, a fitting assembly for conduits includes a first fitting component having an interior wall extending along a central axis from an inboard end to an outboard end, a second fitting component that assembles with the first fitting component, a first conduit gripping device disposed in the first fitting component, and a second conduit gripping device disposed in the first fitting component between the first conduit gripping device and an annular shoulder portion of the first fitting component, the second conduit gripping device being releasably cartridged with the first conduit gripping device. The second conduit gripping device includes a rear retaining extension having a hook portion engaging an interior recess in an outboard end portion of the first fitting component to retain the second conduit gripping device with the first fitting component. When the first fitting component is pulled up on the second fitting component, radial expansion of a rear portion of the second conduit gripping device causes the rear retaining extension to disengage from the interior recess in the outboard end portion of the first fitting component to permit disassembly of the first fitting component from the second conduit gripping device.
In accordance with another embodiment of one or more of the inventions presented in this disclosure, a preassembly for a conduit fitting includes an annular fitting component having an interior wall extending along a central axis from an inboard end to an outboard end, a first conduit gripping device disposed in the first fitting component, a second conduit gripping device disposed in the first fitting component between the first conduit gripping device and an annular shoulder portion of the first fitting component, the second conduit gripping device being releasably cartridged with the first conduit gripping device, and a cover member having a first end hook portion engaging an interior notch portion of the second conduit gripping device to retain the second conduit gripping device with the first fitting component, and a second end portion abutting an outboard end portion of the annular fitting component to cover a bore in the outboard end portion of the annular fitting component, the cover member being removable prior to installation of a conduit in the annular fitting component.
In accordance with another embodiment of one or more of the inventions presented in this disclosure, a preassembly for a conduit fitting includes an annular fitting component having an interior wall extending along a central axis from an inboard end to an outboard end, at least a first conduit gripping device disposed within the annular fitting component and including an outer radial portion, and a releasable material adhered between the interior wall of the annular fitting component and the outer radial portion of the first conduit gripping device for axial retention of the first conduit gripping device in the annular fitting component. When the annular fitting component is assembled with a mating fitting component and pulled up on a conduit, the releasable material separates to permit separation of the annular fitting component from the first conduit gripping device.
In accordance with another embodiment of one or more of the inventions presented in this disclosure, a method of assembling a preassembly for a conduit fitting includes the steps of providing an annular fitting component having an interior wall extending along a central axis from an inboard end to an outboard end, inserting at least a first conduit gripping device into the inboard end of the annular fitting component, and inserting a retaining member into the inboard end of the annular fitting component, such that an outer radial portion of the retaining member interlocks with a circumferential recess in the annular fitting component, and a radially inward extending projection is radially aligned with an outer radial portion of the first conduit gripping device to prevent withdrawal of the first conduit gripping device from the inboard end of the annular fitting component.
In accordance with another embodiment of one or more of the inventions presented in this disclosure, a preassembly for a conduit fitting includes a first conduit gripping device comprising a rear portion defining a first outer radial surface, a second conduit gripping device comprising a front portion defining a second outer radial surface, and a retaining device having a first interlock portion that interlocks with the first outer radial surface, and a second interlock portion that interlocks with the second outer radial surface, such that the retaining device holds the first conduit gripping device and the second conduit gripping device together as a discrete subassembly.
In accordance with another embodiment of one or more of the inventions presented in this disclosure, a preassembly for a conduit fitting includes an annular fitting component having an interior wall extending along a central axis from an inboard end to an outboard end, a conduit gripping device disposed in the annular fitting component and comprising an outer radial surface at a back portion thereof, and a retaining device having an inboard first interlock portion that interlocks with the outer radial surface of the conduit gripping device, and an outboard second interlock portion axially spaced apart from the first interlock portion. The second interlock portion interlocks with the interior wall of the annular fitting component, such that the retaining device holds the annular fitting component and the conduit gripping device together as a discrete subassembly.
In accordance with another embodiment of one or more of the inventions presented in this disclosure, a preassembly for a conduit fitting includes an annular fitting component having an interior wall extending along, a central axis from an inboard end to an outboard end, a first conduit gripping device disposed in the annular fitting component, a second conduit gripping device disposed in the annular fitting component between the first conduit gripping device and a drive surface of the annular fitting component, and a retaining device having a first interlock portion that interlocks with the first conduit gripping device and a second interlock portion that interlocks with the annular fitting component, such that the retaining device holds the first conduit gripping device, the second conduit gripping device, and the annular fitting component together as a discrete subassembly.
In accordance with another embodiment of one or more of the inventions presented in this disclosure, a preassembly for a conduit fitting includes a first conduit gripping device having a rear portion defining a first outer radial surface, a second conduit gripping device having a front portion defining a second outer radial surface, an annular fitting component having an interior wall extending along a central axis from an inboard end to an outboard end, and a retaining device having a first interlock portion that interlocks with the first conduit gripping device, and a second interlock portion that interlocks with the second conduit gripping device, such that the retaining device holds said first conduit gripping device and said second conduit gripping device together as a discrete subassembly prior to installation of the first and second conduit gripping device into the annular fitting component. The retaining device further includes a third interlock portion that interlocks with the interior wall of the annular fitting component when the first conduit gripping device, the second conduit gripping device, and the retaining device are installed in the annular fitting component.
In accordance with another embodiment of one or more of the inventions presented in this disclosure, a method of pre-installing a conduit gripping device in an annular fitting component includes the steps of providing an annular fitting component having an interior wall extending along a central axis from an inboard end to an outboard end, providing a preassembly including a conduit gripping device and a retaining device having an inboard first interlock portion that interlocks with an outer radial surface on an outboard portion of the conduit gripping device, and inserting the preassembly into the inboard end of the annular fitting component to interlock an outboard second interlock portion of the retaining device with the interior wall of the annular fitting component, such that the retaining device holds said annular fitting component and said conduit gripping device together as a discrete subassembly.
In accordance with another embodiment of one or more of the inventions presented in this disclosure, a method of pre-assembling first and second conduit gripping devices together as a preassembly includes the steps of providing a first conduit gripping device including a rear portion defining a first outer radial surface and a second conduit gripping device including a front portion defining a second outer radial surface, and assembling a retaining device with the first and second conduit gripping devices, such that a first interlock portion of the retaining device interlocks with the first outer radial surface of the first conduit gripping device, and a second interlock portion of the retaining device interlocks with the second outer radial surface of the second conduit gripping device, to hold the first conduit gripping device and the second conduit gripping device together as a discrete subassembly.
These and other aspects and advantages of the inventions described herein will be readily appreciated and understood by those skilled in the art in view of the accompanying drawings.
Although the exemplary embodiments herein are presented in the context of a stainless steel tube fitting, the inventions herein are not limited to such applications, and will find use with many different conduits such as tube and pipe as well as many different suitable materials, including metals and non-metals for either the conduit, the gripping devices or the fitting components or any combination thereof. Exemplary materials include various stainless steels, including, for example, 316 stainless steel, 304 stainless steel, AL-6XN stainless steel alloy, 254 SMO stainless steel alloy, Inconel® alloy 625 stainless steel, and Incoloy® alloy 825 stainless steel, as well as Hastelloy®, brass, titanium, and aluminum, to name a few examples. The inventions may also be used for liquid or gas fluid systems. While the inventions herein are illustrated with respect to particular designs of the conduit gripping devices and fitting components, the inventions are not limited to use with such designs, and will find application in many different fitting designs that use one or more conduit gripping devices. We use the term “conventional” to refer to commercially available or later developed parts or parts that are otherwise commonly known, used or that those of ordinary skill in the art would be familiar with in general, as distinguished from parts that may be modified in accordance with teachings herein. We use the term “ferrule set” to refer to a combination of conduit gripping devices with or without other parts that form the means by which conduit grip and seal are achieved. In one example, one or more conduit gripping members may include heat treated hardened ferrules, with the heat treating being, for example, a case hardening of stainless steel or some other metal alloy by a lower temperature interstitial (e.g., carbon, nitrogen, or both) diffusion into the metal ferrule. Although not necessary with all fitting designs, it is common that a ferrule set comprises two ferrules that are purposely matched to each other and to the fitting components, for example, based on material, manufacturer, interrelated design and geometry features and so on. In some fittings, in addition to the conduit gripping devices there may be one or more additional parts, for example seals. Therefore, the term “ferrule set” may also include in some embodiments the combination of one or more conduit gripping devices with one or more other parts by which the ferrule set effects conduit grip and seal after a complete pull-up. The inventions may be used with tube or pipe, so we use the term “conduit” to include tube or pipe or both. We generally use the term “fitting assembly” or “fitting” interchangeably as a shorthand reference to an assembly of typically first and second fitting components along with one or more conduit gripping devices. The concept of a “fitting assembly” thus may include assembly of the parts onto a conduit, either in a finger-tight position, a partial pull-up position or complete pull-up position; but the term “fitting assembly” is also intended to include an assembly of parts together without a conduit, for example for shipping or handling, as well as the constituent parts themselves even if not assembled together.
The term “complete pull-up” and derivative forms as used herein refers to joining the fitting components together so as to cause the one or more conduit gripping devices to deform, usually but not necessarily plastically deform, to create a fluid tight seal and grip of the fitting assembly on the conduit. A “partial pull-up” and derivative terms as used herein refers to a partial but sufficient tightening of the male and female fitting components together so as to cause the conduit gripping device or devices to deform so as to be radially compressed against and thus attached to the conduit, but not necessarily having created a fluid tight connection or the required conduit grip that is achieved after a complete pull-up. The term “partial pull-up” thus may also be understood to include what is often referred to in the art as pre-swaging wherein a swaging tool is used to deform the ferrules onto the conduit sufficiently so that the ferrules and the nut are retained on the conduit prior to being mated with the second fitting component to form a complete fitting assembly. A finger tight position or condition refers to the fitting components and conduit gripping devices being loosely assembled onto the conduit but without any significant tightening of the male and female fitting components together, usually typified by the conduit gripping device or devices not undergoing plastic deformation.
Fittings typically include two fitting components that are joined together, and one or more gripping devices, however, the inventions herein may be used with fittings that include additional pieces and parts. For example, a union fitting may include a body and two nuts. We also use the term “fitting remake” and derivative terms herein to refer to a fitting assembly that has been at least once tightened or completely pulled-up, loosened, and then re-tightened to another completely pulled-up position. Remakes may be done with the same fitting assembly parts (e.g. nut, body, ferrules), for example, or may involve the replacement of one of more of the parts of the fitting assembly. Reference herein to “outboard,” “axially outward,” “inboard,” and “axially inward” are for convenience and simply refer to whether a direction is towards the center of a fitting (inboard or axially inward) or away from the center (outboard or axially outward). In the drawings, various gaps and spaces between parts (for example, gaps between the ferrules and the conduit in a finger-tight position) may be somewhat exaggerated for clarity or due to scale of the drawings.
While various inventive aspects, concepts and features of the inventions may be described and illustrated herein as embodied in combination in the exemplary embodiments, these various aspects, concepts and features may be used in many alternative embodiments, either individually or in various combinations and sub-combinations thereof. Unless expressly excluded herein all such combinations and sub-combinations are intended to be within the scope of the present inventions. Still further, while various alternative embodiments as to the various aspects, concepts and features of the inventions—such as alternative materials, structures, configurations, methods, circuits, devices and components, software, hardware, control logic, alternatives as to form, fit and function, and so on—may be described herein, such descriptions are not intended to be a complete or exhaustive list of available alternative embodiments, whether presently known or later developed. Those skilled in the art may readily adopt one or more of the inventive aspects, concepts or features into additional embodiments and uses within the scope of the present inventions even if such embodiments are not expressly disclosed herein. Additionally, even though some features, concepts or aspects of the inventions may be described herein as being a preferred arrangement or method, such description is not intended to suggest that such feature is required or necessary unless expressly so stated. Still further, exemplary or representative values and ranges may be included to assist in understanding the present disclosure, however, such values and ranges are not to be construed in a limiting sense and are intended to be critical values or ranges only if so expressly stated. Moreover, while various aspects, features and concepts may be expressly identified herein as being inventive or forming part of an invention, such identification is not intended to be exclusive, but rather there may be inventive aspects, concepts and features that are fully described herein without being expressly identified as such or as part of a specific invention, the inventions instead being set forth in the appended claims. Descriptions of exemplary methods or processes are not limited to inclusion of all steps as being required in all cases, nor is the order that the steps are presented to be construed as required or necessary unless expressly so stated.
With general reference to
In this disclosure unless otherwise noted, as shown in
The fitting assembly 10 may be used to form a fluid tight connection between an end portion 18a of a conduit 18 and the body 12 using one or more conduit gripping devices, which in the exemplary embodiments herein may be realized in the form of one or more ferrules. However, conduit gripping devices other than those that may be understood in the art as ‘ferrules’ may also be used with the inventions herein. The conduit end 18a typically bottoms against a radial shoulder 19 (
It is important to note that the exemplary geometric shapes, configurations and designs of the fitting coupling components 12, 14, and the conduit gripping devices 24, 30 are a matter of design choice and will depend in great measure on the materials used, and the design and performance criteria expected of the fitting. Many different coupling components and conduit gripping device designs are known in the art and may be designed in the future.
A significant feature of some of the inventions herein is the provision of a retaining structure by which one or more conduit gripping devices are retained with a fitting component, also referred to herein as a retaining fitting component, prior to assembly of the fitting component with a mating fitting component. By “cartridge” we mean a group of parts retained together as a discontinuous unit, subassembly or preassembly. We therefore use the terms cartridge, unit, subassembly and preassembly synonymously herein in the context of a discontinuous structure. We also use the term “cartridge nut” or “conduit fitting cartridge” herein to refer to such a cartridge, unit or subassembly in which one or more conduit gripping devices are retained with a fitting component such as a female nut, for example. We also use the term “ferrule cartridge” or “conduit gripping device cartridge” to refer to a unit or subassembly made up of at least one ferrule or conduit gripping device with at least one other part held together as a discrete unit. In particular, a “ferrule cartridge” includes two or more ferrules held together as a discrete unit or subassembly, and may include additional parts, for example, seals. In the exemplary embodiments herein, the cartridge includes one or more ferrules retained with a fitting component, such as a female threaded nut. Therefore, the exemplary embodiments herein may be referred to as a cartridge nut design, however in alternative embodiments, a “cartridge nut” may include a male threaded cartridge nut design or a cartridge body design.
As one aspect of the present application, use of a discontinuous fitting component cartridge may facilitate providing ferrule sets to the end user in which the ferrules and nuts are properly oriented, matched, and assembled at the manufacturer. This can significantly simplify inventory control and reduce final assembly time. The embodiments herein also allow for a cartridge design in which the retaining fitting component may be used for fitting assemblies that do not need or have the retaining member. In other words, the cartridge designs herein use a nut or retaining fitting component that is backwards compatible with fitting assemblies that the end user may not require with a retaining structure. The cartridge design also may be realized using ferrule sets that do not require modification. Therefore, the cartridge concepts herein may be optionally provided for an end user without having to manufacture nuts or ferrules with different geometry and operation or performance. This allows the convenience of manufacturing and selling fitting components and ferrules as separate parts regardless of the end use of such individual parts, either for a cartridge use or a non-cartridge use.
Exemplary cartridge nut arrangements are described in co-owned U.S. Pat. No. 8,931,810 (THE “'810 Patent”), U.S. patent application Ser. No. 15/248,288 (the “'288 Application”), filed on Aug. 26, 2016 and titled COMPONENT RETAINING STRUCTURE FOR CONDUIT FITTING, and U.S. patent application Ser. No. 15,416,048 (the “'048 Application”), filed of Jan. 26, 2017 and titled COMPONENT RETAINING STRUCTURE FOR CONDUIT FITTING, the entire disclosures of each of which are incorporated herein by reference. In some embodiments of the '810 Patent and the '288 Application (see, e.g., the embodiments of FIGS. 33-37 of the '810 Patent and the embodiments of FIGS. 1-6 of the '288 Application), a component retaining or cartridging structure includes a separate retaining ring that that retains or captures an outer radial portion of the conduit gripping device within the fitting nut when the retaining ring is in a first, cartridging position. When the fitting is pulled up, an outboard end portion of the fitting body axially pushes the retaining ring end portion within the fitting nut into alignment with a circumferential recess in the fitting nut, into which the aligned retaining ring snaps radially outward to radially separate from the outer radial portion of the front ferrule, to permit withdrawal or removal of the ferrules from the fitting nut.
In exemplary embodiments of the '288 Application (see FIGS. 1-6 of the '288 Application), the front ferrule is provided with a back-end flange that defines the outer radial portion of the ferrule. This flange abuts the retaining ring when the front ferrule is in an axially forward or inboard position so as to hold the ferrules and the nut together as a discontinuous cartridge. Further, to prevent the retaining member from being bumped, jostled, or otherwise prematurely forced into the ferrule releasing recess, the ferrules may be arranged such that prior to deformation of the ferrules associated with a pull-up of the fitting (e.g., a full or partial pull-up of the fitting), the ferrules block movement of the retaining ring into axial alignment with the recess. When the fitting is pulled up by a sufficient amount, the front and rear ferrules are deformed such that the back flange of the front ferrule is axially and/or radially displaced from the recessed portion, thereby permitting movement of the retaining member into axial alignment with the recessed portion.
According to an exemplary aspect of the present application, a retaining ring for use in a retaining fitting component (e.g., fitting nut), utilizing one or more of the features of the above incorporated '810 Patent and '288 and '048 Applications, may be sized and contoured for use with a conduit gripping device (e.g., front ferrule or single ferrule) provided with a more conventional frustoconical outer radial surface (i.e., without an enlarged back end flange), for example, to allow for use with existing conventionally shaped ferrules. In one such embodiment, the retaining ring includes an axially and/or radially enlarged cross section (e.g., as compared to the retaining ring of the embodiment of FIGS. 1-6 of the '288 Application) to engage a portion of the frustoconical outer surface radially and axially inward of the outer rear end portion of the ferrule, to block alignment of the retaining ring with the fitting nut recess prior to pull-up, and/or to block alignment of the rear end portion of the ferrule with the recess (e.g., to prevent the ferrule rear end from being cocked or otherwise received in the recess). Additionally, the retaining ring may be provided with an inner radial surface contoured to allow axial movement of the retaining ring towards the ferrule during pull-up by an amount sufficient to align the retaining ring with the recess.
In the illustrated embodiment of
In the illustrated embodiment, the retaining ring is disposed in a first axial position or retaining position in the pre-assembled stand alone cartridge 25 (
The exemplary nut 14 includes a first interior portion 48 that receives the retaining ring 46 to position the retaining ring 46 in the retaining, first axial position. This first portion may be recessed from an axially inner end of the nut 14 to prevent the retaining ring from being axially withdrawn from the nut. The nut 14 further includes a second recessed portion or pocket 54, formed in an interior surface of the nut that axially locates the release or second axial position of the retaining member 46. The recessed portion 54 may be axially adjacent the first axial position of the retaining member, or may be further axially spaced therefrom as needed. The exemplary recessed portion has a greater radial dimension than the portion of the nut in which the retaining member is disposed in the first axial position, so that the retaining member 46 is restricted to the first radial position when in the first axial position, and can expand radially outwardly to the second radial position when aligned with the recessed portion in the second axial position. The second radial recess 54 thus axially locates the release position. The radial depth of the second radial recess 54 may be chosen so that when the retaining member 46 is located therein, the retaining member no longer adversely interferes with the conduit gripping devices 24, 30 (e.g., providing for radial clearance of the retaining member 46 from the front ferrule 24, or providing for minimal radial interference between the retaining member and the front ferrule so as to permit manual axial disengagement of the nut 14 from the front ferrule 24 when the nut is manually loosened from the fitting body 12).
The second axial position of the retaining member (e.g., as determined by an axial location of the recessed portion 54 of the nut 14) may be chosen in concert with the amount of relative axial displacement of the nut 14 and the body 12 to determine at what point during pull-up the retaining member 46 is transposed to the release position by being moved into the recessed portion 54. For example, it may be desired in some embodiments to have the retaining member 46 be displaced to the release position upon completion of a pull-up operation, prior to completion of a pull-up operation, upon completion of a pre-swage operation, or upon tightening to a partial pull-up condition that is sufficient to cause the conduit gripping devices to begin plastically deforming the conduit, such that subsequent loosening or separation of the retaining fitting component from the mating fitting component permits the released conduit gripping devices to maintain gripping engagement with the deformed conduit surfaces.
To accommodate the axial movement of the retaining ring 46 during pull-up, the inner radial surface of the retaining ring may be shaped to provide radial clearance for the front ferrule 24 during pull-up of the fitting, as the retaining ring is pushed axially outward, prior to snapping radially outward into the recess, and as the rear portion of the front ferrule is expanded radially outward and driven axially outward into the nut. As shown, the inner radial portion 42 of the retaining ring 46 includes a chamfered or otherwise contoured surface 42a shaped to provide clearance for the rear portion of the front ferrule 24 to allow for axially outward travel of the retaining ring 46 into alignment with the nut recess 54. This contoured surface 42a may additionally provide for increased retaining engagement (e.g., along an expanded contact surface area) between the retaining ring 46 and the front ferrule 24, and/or to minimize marring of the engaging portions of the components, when the cartridged front ferrule is moved axially inward into engagement with the retaining ring. Accordingly, the contoured surface 42a of the inner radial portion 42 of the retaining ring 46 may form a frustoconical outboard facing surface complementary to (e.g., disposed at an angle within about 10° of) the frustoconical outer surface of the front ferrule (e.g., disposed at an angle of about 15° with respect to the longitudinal axis X) to provide for increased clearance and/or increased surface area contact between the retaining ring and the frustoconical rear end portion 23a. In some embodiments, the contoured surface 42a may be disposed at an angle slightly greater than the ferrule rear end angle (e.g., between about 15° and 25° for a ferrule having a rear end angle of 15°) to account for an increase in the ferrule surface angle due to rear end radial expansion during pull-up. As shown, the inner radial portion 42 of the retaining ring may be contoured on both sides to permit reversible installation of the retaining ring 46 in the nut 14.
While the second axial position of the retaining ring 46 may provide radial clearance between the retaining ring 46 and the front ferrule 24, as described above, in other embodiments, a certain amount of radial interference may remain between the retaining ring and front ferrule. This radial interference may be limited to permit axial disengagement of the nut 14 from the front ferrule 24, with the retaining member 46 functioning as a detent to provide only limited resistance to manual axial disengagement of the nut 14 from the front ferrule 24, when the nut is unthreaded or loosened from the fitting body 12.
In another embodiment, a radially outward biased, but further radially compressible, retaining ring of a cartridged nut and ferrule subassembly may be secured in a first, axially inner shallower recess of the nut to retain the ferrule or ferrules in the cartridge subassembly. The first recess is separated from a second, axially outer deeper recess of the nut by a ring retaining wall portion that extends radially inward of each of the first and second recesses. At least one of the retaining ring and the ring retaining wall portion includes a ramped surface to facilitate radial compression of the retaining ring in response to forced axial engagement of the retaining ring with the ring retaining wall portion. To axially move the retaining ring from the first recess to a second, axially outer recess of the nut, the retaining ring must be driven axially outward with enough force (e.g., during fitting pull-up) to further radially compress the retaining ring to clear the ring retaining wall portion before snapping radially outward into the second recess upon axial alignment with the second recess. When received in the second recess, the retaining ring radially expands away from radial alignment with the rear portion of the front ferrule to permit disassembly of the nut from the ferrules (e.g., providing radial clearance or minimal radial interference between the retaining ring and the front ferrule).
In the illustrated embodiment of
In the cartridged condition, the retaining ring 146 is received or seated in the first recess 148, such that an inner radial portion of the retaining ring radially aligns with the rear portion of the front ferrule 124 to block withdrawal of the ferrules 124, 130 from the nut 114. In the illustrated embodiment, an inboard surface 151a of the ring retaining wall portion 151 and an outboard surface 146a of the retaining ring 146 are similarly ramped to facilitate radial compression of the retaining ring 146 in response to forced axial engagement of the retaining ring outboard surface 146a with the inboard surface 151a of the ring retaining wall portion 151. As shown, the retaining ring 146 may include ramped surfaces 146a, 146b on both sides to permit reversible installation of the retaining ring 146 in the nut 114. Further, the first recess 148 may include a ramped inner surface 148a to permit forced axial extraction of the retaining ring 146 from the inboard end of the fitting nut, by facilitating radial compression of the retaining ring (e.g., by grasping and pulling the retaining ring using a tool inserted into the fitting nut). In other embodiments (not shown), only one of the wall portion inboard surface and the retaining ring outboard surface may be ramped, or the wall portion inboard surface and the retaining ring outboard surface may be differently contoured while still providing for radial compression of the retaining ring in response to forced axial engagement of the wall portion inboard surface with the retaining ring outboard surface.
As shown in
According to another aspect of the present application, a cartridging fitting arrangement may be provided with a retaining fitting component (e.g., a fitting nut) and a conduit gripping device (e.g., a single ferrule or a front ferrule of a two ferrule configuration) having an outer circumferential recess that axially captures a radially inward extending projection provided with or connected to an interior wall of the retaining fitting component (e.g., integral to or assembled with the retaining fitting component) to cartridge the conduit gripping device with the retaining fitting component. The projection may form a continuous ring around the interior wall, or one or more discrete spaced apart projections extending from the interior wall. When the fitting is pulled up, axial movement of the conduit gripping device with respect to the projection causes the projection to be plastically deformed into a recess disengaging condition, to permit disassembly of the retaining fitting component from the conduit gripping device.
In still other embodiments, an insert having an axially bendable inward projection may be used to snap into retaining or cartridging engagement with an inboard facing outer surface (e.g., a frustoconical surface) of a conventional ferrule (e.g., single ferrule or front ferrule, similar to the integral nut projection embodiments of FIGS. 18-22 of the above incorporated '810 Patent). One such exemplary fitting 200a is shown in
In an exemplary method of assembling a preassembly for a conduit fitting, an annular fitting component is provided, having an interior wall extending along a central axis from an inboard end to an outboard end. At least a first conduit gripping device is inserted into the inboard end of the annular fitting component. A retaining member is inserted into the inboard end of the annular fitting component, such that an outer radial portion of the retaining member interlocks with a circumferential recess in the annular fitting component, and a radially inward extending projection is radially aligned with an outer radial portion of the first conduit gripping device to impede withdrawal of the first conduit gripping device from the inboard end of the annular fitting component.
In other embodiments, an insert having an axially bendable inward projection may be used to snap into retaining or cartridging engagement with an inboard facing surface of the rear ferrule (or a single ferrule in a single ferrule fitting configuration), to retain the rear ferrule with the fitting nut. In one such embodiment, this rear ferrule retaining arrangement may be used in combination with a cartridged front and rear ferrule arrangement, as described in greater detail below, to retain both the rear ferrule and the front ferrule with the nut.
In other embodiments, a radially inward extending projection provided with a retaining fitting component may be disposed on a ring, band, or other component or insert assembled with the retaining fitting component to be received in an outer circumferential recess of the conduit gripping device when the conduit gripping device (e.g., one or more ferrules) is installed or cartridged in the retaining fitting component. When the fitting is pulled up, axial movement of the conduit gripping device with respect to the projection causes the projection to be plastically deformed into a recess disengaging condition, to permit disassembly of the retaining fitting component from the conduit gripping device.
In other embodiments, instead of axially bending, a retaining projection of a cartridge fitting component may be plastically expanded or flattened during pull-up to reduce engagement (e.g., disengage or minimize radial interference) from the conduit gripping device (e.g., single ferrule or front ferrule).
In another embodiment, a retaining projection may be defined by a retaining ring that is plastically radially expandable within a circumferential recess of a retaining fitting component, such that upon pull-up, the retaining ring is plastically expanded to be received further into the recess for radial disengagement from the conduit gripping device (e.g., single ferrule or front ferrule). This plastic expansion may result, for example, from an interference fit between the projection and the recess, or one or more tabs or other such spacers within the recess (e.g., integral with the retaining ring or disposed between the retaining ring and the recess) are deformed or broken to permit outward biased expansion of the retaining ring within the recess.
In other embodiments, a retaining ring may be assembled with a conduit gripping device (e.g., a single ferrule or front ferrule), either before or after the conduit gripping device is installed in a retaining fitting component. The retaining ring may be expanded onto the conduit gripping device and seated between a circumferential recess in the interior wall of the retaining fitting component and an outer surface of the conduit gripping device. When the fitting is pulled up, a portion of a mating fitting component (e.g., fitting body) engages the retaining ring and axially moves the retaining ring into axial alignment with a circumferential recess in the conduit gripping device, allowing the retaining ring to radially retract into the gripping device recess to provide radial clearance between the retaining ring and the interior wall of the retaining fitting component, to permit disassembly of the retaining fitting component from the conduit gripping device.
As shown in the corresponding Figures for several of the embodiments described above (see, e.g.,
In the above incorporated '627 Patent and '110 Application, and as shown in several of the embodiments herein, the front ferrule includes a retaining extension that is generally annular and extends axially from a back wall or outboard radial surface of the front ferrule. The extension acts as a clip or tang that snaps over the crown of the back ferrule when the ferrules are axially pressed together. In other embodiments, the front ferrule extension may be plastically deformed or crimped radially inward over an enlarged front portion (e.g., a crown portion) of the rear ferrule, for example, using a clamping tool or other such device.
According to an exemplary aspect of the present application, a rear ferrule retaining member may be configured to extend radially inward between the front and rear ferrule in a retaining condition. The rear ferrule retaining member may be deformable to release the rear ferrule from the nut, for example, by manual unthreading or loosening of the nut from the body of a pulled-up fitting.
The outer radial portion 841 of the retaining member 840 may be secured in a groove or recess, or may be press fit, for example, against a tapered interior surface of the nut, as shown in
According to another exemplary aspect of the present application, a rear ferrule retaining member may be deformable to release the rear ferrule from the nut as a result of pull-up of the nut on a fitting body during installation of the fitting on a conduit.
When the nut 814′ is assembled with a fitting body 812′ and is pulled up on the body (
According to another exemplary aspect of the present application, a rear ferrule retaining ring may be configured to engage a rear end portion of the rear ferrule in a retaining condition. When the fitting is pulled up, the resulting radial outward expansion of the rear end portion of the rear ferrule plastically deforms the retaining ring into a radially outward, ferrule releasing condition.
In another embodiment, a fitting nut may be provided with a retaining extension (e.g., ring, or one or more pins or tabs) configured to engage a rear end portion of the rear ferrule in a retaining condition, and plastically deforming to release the rear ferrule upon pull-up.
The retaining extension 1040 may be flexible, such that the rear ferrule 1030 may be installed in the nut 1014 by pushing the rear end portion 1031 of the rear ferrule 1030 against the retaining extension 1040 to elastically radially expand the retaining extension to receive the rear portion 1031 therethrough. Alternatively, the retaining extension 1040 may be crimped or staked (e.g., by a tool inserted into the nut) into retaining engagement with the rear ferrule rear portion 1031 after the rear ferrule 1030 has been loosely installed in the nut 1030. The ferrules 1024, 1030 may be pre-cartridged with each other before installation in the nut 1014 (as described above and in the above incorporated '627 Patent and '110 Application), or the front ferrule 1024 may be cartridged with the rear ferrule 1030 after the rear ferrule has been installed in the nut. When the nut 1014 is assembled with a fitting body 1012 and is pulled up on the body (
In another embodiment, a fitting nut may be provided with a retaining extension (e.g., ring, or one or more pins or tabs) configured to be received in a recess in the rear portion of the rear ferrule when the rear ferrule is installed in nut, with the retaining extension shearing to separate the rear ferrule from the nut when the nut is assembled with a fitting body and is pulled up on the body.
In another embodiment, a rear ferrule may be provided with a retaining extension (e.g., ring, or one or more pins or tabs) configured to be received in a recess in the drive surface of the fitting nut when the rear ferrule is installed in nut, with the retaining extension shearing to separate the rear ferrule from the nut when the nut is assembled with a fitting body and is pulled up on the body.
In other embodiments, a retaining member secured with the outboard end of the fitting nut may interlock with or otherwise engage an inner notched portion of the rear ferrule (or with a single ferrule in a single ferrule fitting design). When the fitting is pulled up, the resulting radial outward expansion of the rear end portion of the rear ferrule causes the inner notched portion to disengage from the retaining member, thus allowing the nut to be disassembled from the rear ferrule.
In an exemplary embodiment, a rear ferrule retaining member is formed as a ring sized to be compressibly received through the outboard opening in the nut, with a first end hook portion engaging the rear ferrule inner notch, and a second end hook portion engaging an internal recess in the nut outboard end.
In an exemplary embodiment, a rear ferrule retaining ring is formed on the rear ferrule as an integral hook extension configured to engage an internal recess in the nut outboard end.
In another exemplary embodiment, a rear ferrule (or single ferrule, in a single ferrule fitting design) retaining member is provided as a removable component intended to be removed after the nut subassembly is loosely assembled with a fitting body, and before the conduit is installed in the nut and body. In one such embodiment, the removable retaining member may form a dust cover or other such cover member to keep dust or other contaminants out of the internal surfaces of the cartridge subassembly, or out of a finger tight fitting assembly in storage prior to installation and pull-up on a conduit.
According to another aspect of the present application, one or more ferrules may be cartridged with each other and/or with a fitting nut using an adhesive, wax, polymer, thixotropic substance, tape, or other releasable material applied to adjacent surfaces of the fitting components. As one example, an adhesive securing together a retaining fitting component (e.g., nut) and a ferrule, and/or a front ferrule and a rear ferrule may be provided with an encapsulated solvent (e.g., a microencapsulated solvent), such that when the adhered surfaces are exposed to assembly related forces (e.g., compressive, tensile, and/or shear forces), the adhesive is exposed to the solvent to dissolve the adhesive. As another example, a releasable material (e.g., an adhesive or polymer) disposed in a recess of a fitting component surface (e.g., ferrule outer surface, nut interior surface) may be plastically compressible, such that radial movement of the adjacent surfaces between which the releasable material is disposed causes the releasable material to flatten and/or detach from either or both of the adjacent surfaces. As still another example, a tape member or adhesive tab, may be bent, folded or otherwise positioned to span across adjacent surfaces of two or more fitting components (e.g., a ferrule and a nut, or a front ferrule and a back ferrule, with the adhesive tab shearing upon fitting pull-up (e.g., due to torsion, radial, and/or axial forces between the adjacent fitting components). As yet another example, a releasable material may include a compressible or frictional material selected to resist axial separation by providing for press fit, interference fit, or friction fit retention between a nut and ferrule and/or between a front ferrule and a back ferrule. The releasable material may be configured to release upon pull-up, or may be configured to maintain detent-type retention, allowing for disengagement of the nut from the ferrules when the nut is unthreaded or loosened from the pulled up fitting, or when the ferrules are extracted from the nut prior to fitting assembly (e.g., for inspection).
According to another aspect of the present application, either or both of a ferrule outer diameter and a nut inner diameter may be provided with one or more surfaces adapted to provide for a cartridging friction fit between the ferrule and the nut. As one example, the ferrule outer diameter or the nut inner diameter may be provided with a slightly eccentric shape, such that portions of the eccentrically shaped surface frictionally engage the other of the ferrule outer diameter and the nut inner diameter to retain the ferrule in the nut. As another example, a uniform or segmented raised ring of deformable material on the ferrule outer diameter or the nut inner diameter may provide for frictional retention of the ferrule with the nut. As still another example, either or both of the ferrule outer diameter and the nut inner diameter may be provided with knurling, threads, serrations, or other such surface conditions to provide for frictional retention of the ferrule with the nut.
According to still another aspect of the present application, one or more ferrules (or other such conduit gripping devices) may be cartridged with each other and/or with a fitting nut (or other such fitting component) using a separate retaining device that grips, holds, snaps onto, or otherwise interlocks with portions of the one or more ferrules and/or the fitting nut. In one such embodiment, the separate retaining device includes a first interlock or retaining portion that interlocks with an outer radial surface of one of the one or more ferrules, and a second interlock or retaining portion that interlocks with an interior wall of the fitting nut, such that the retaining device holds the fitting nut and the one of the one or more ferrules together as a discrete subassembly. The interlock portions of the retaining device may be formed from a material that retains its shape while allowing for elastic deformation, for example, such that the retaining device can snap into interlocking engagement with the retained fitting component(s). This elastic deformability may also allow for selective disengagement or detachment of the retained fitting component(s) from the retaining device, for example, due to forces applied during fitting pull-up, or from a user-applied axial, lateral, rotational, or pivoting force. Other types of retaining portions or retaining arrangements may be used to attach one or more fitting components to a separate retaining device, including, for example, adhesive or welded connections.
While the separate nut-ferrule retaining device may be provided in any suitable shape or structure, in an exemplary embodiment, a retaining device includes an annular frame or body portion having one or more inboard interlock tabs that interlock with an outer radial surface of the ferrule, and one or more outboard interlock tabs that interlock with an interior wall of the fitting nut.
In one embodiment, the interlock tabs 1642, 1644 of the retaining device 1640 are elastically deformable and contoured to provide for snap-together engagement of the retaining device 1640 with the front ferrule 1624 and the fitting nut 1614. In the illustrated embodiment of
In another exemplary embodiment, the inboard interlock tabs of the retaining device may be plastically deformed into engagement with the outer radial portion of the front ferrule, and/or the outboard interlock tabs may be plastically deformed into engagement with the interior wall of the fitting nut, for example, by crimping, staking or otherwise deforming (e.g., using a tool) the interlock tabs.
The separate retaining device may be configured to disengage from either or both of the front ferrule and the fitting nut during pull-up of the fitting on a conduit, for example, to permit disassembly of the fitting nut from the ferrules once the ferrules have been installed or swaged onto a conduit end. In an exemplary embodiment, the radially outward extending portions 1645 of the outboard interlock tabs 1644 engage a tapered interior wall surface of the fitting nut during pull-up, causing the radially outward extending portions 1645 to be plastically deformed radially inward and out of engaging alignment with the interior wall recess 1654. In other embodiments, the radially outward extending portions of the outboard interlock tabs may remain lightly engaged or in separable interlocking engagement with the interior wall recess, such that when the pulled-up fitting is disassembled, the fitting nut may be axially separated from the retaining device. Additionally or alternatively, the elastic deformability of the interlock tabs 1642, 1644 may allow a user to selectively disengage the front ferrule 1624 and/or the fitting nut 1614 from the retaining device 1640, for example, by applying one or more of an axial, lateral, rotational, or pivoting force to the retaining device and/or ferrules, for example, to inspect, treat, or replace the detached component.
In one embodiment, the interlock tabs 1742, 1744 of the retaining device 1740 are elastically deformable and contoured to provide for snap-together engagement of the retaining device 1740 with the front ferrule 1724 and the rear ferrule 1730. In the illustrated embodiment of
In another exemplary embodiment, the inboard interlock tabs of the retaining device may be plastically deformed into engagement with the outer radial rear portion of the front ferrule, and/or the outboard interlock tabs may be plastically deformed into engagement with the outer radial front portion of the rear ferrule, for example, by crimping, staking or otherwise deforming (e.g., using a tool) the interlock tabs.
The separate retaining device may be configured to disengage from either or both of the front ferrule and the rear ferrule during pull-up of the fitting on a conduit, for example, to permit or maintain a desired two ferrule function (“TFF”) of the ferrules during pull-up, as described, for example, in U.S. Pat. No. 9,267,627, the entire disclosure of which is incorporated herein by reference. In an exemplary embodiment, the radially inward compression of the front portion of the rear ferrule 1730 during pull-up may cause the front portion of the rear ferrule 1730 to be plastically deformed radially inward and out of engaging alignment with the radially inward extending portions 1747 of the outboard interlock tabs 1744. In other embodiments, the retaining device may loosely capture either or both of the front ferrule rear portion and the rear ferrule front portion, thereby permitting desired relative movement of the front and rear ferrules during pull-up. Additionally or alternatively, the elastic deformability of the interlock tabs 1742, 1744 may allow a user to selectively disengage the front ferrule 1724 and/or the rear ferrule from the retaining device 1740, for example, by applying one or more of an axial, lateral, rotational, or pivoting force to the retaining device and/or ferrules, for example, to inspect, treat, or replace the detached component.
In another embodiment, a retaining device may be configured to initially retain a front ferrule and rear ferrule together as a ferrule preassembly, and to subsequently retain the front and rear ferrules with a fitting nut when the ferrule preassembly is installed in the fitting nut.
To subsequently retain the front and rear ferrules 1824, 1830 preassembly with a fitting nut 1814 when the ferrule preassembly is installed in the fitting nut, the retaining device includes radially outward extending portions 1845 on an outboard side of the frame portion 1841, for engagement with an interior wall 1850 of the fitting nut 1814. While these radially outward extending portions 1845 may be disposed on separate tabs or other such portions of the retaining device 1840, in the illustrated embodiment, the radially outward extending portions 1847 are defined by the same outboard interlock tabs 1844 that define the radial inward extending portion 1847 that engage the front portion of the rear ferrule 1830. When the retaining device 1840 is assembled in a preassembly with a fitting nut 1814 and front and rear ferrules 1824, 1830, as shown in
In one embodiment, the inboard and outboard interlock tabs 1842, 1844 of the retaining device 1840 are elastically deformable and contoured to provide for initial snap-together engagement of the retaining device 1840 with the front ferrule 1824 and the rear ferrule 1830, and the outboard interlock tabs 1844 are elastically deformable to provide for subsequent snap-together engagement of the retaining device 1840 with the fitting nut when the ferrule preassembly is installed in the fitting nut. In the illustrated embodiment of
The radially outward extending portions 1845 of the outboard interlock tabs 1844 are contoured such that when the cartridged ferrules 1824, 1830 and retaining device 1840 are axially pressed into the fitting nut 1814 (
The separate retaining device may be configured to disengage from one or more of the front ferrule, the rear ferrule, and the fitting nut during pull-up of the fitting on a conduit, for example, to permit disassembly of the fitting nut from the ferrules once the ferrules have been installed or swaged onto a conduit end, or to permit or maintain a desired two ferrule function. In an exemplary embodiment, the radially outward extending portions 1845 of the outboard interlock tabs 1844 may engage a tapered interior wall surface of the fitting nut during pull-up, causing the radially outward extending portions 1845 to be plastically deformed radially inward and out of engaging alignment with the interior wall recess 1854. In other embodiments, the radially outward extending portions of the outboard interlock tabs may remain lightly engaged or in separable interlocking engagement with the interior wall recess, such that when the pulled-up fitting is disassembled, the fitting nut may be axially separated from the retaining device. Additionally or alternatively, the radially inward compression of the front portion of the rear ferrule 1830 during pull-up may cause the front portion of the rear ferrule 1830 to be plastically deformed radially inward and out of engaging alignment with the radially inward extending portions 1847 of the outboard interlock tabs 1844. In still other embodiments, the retaining device may loosely capture either or both of the front ferrule rear portion and the rear ferrule front portion, thereby permitting desired relative movement of the front and rear ferrules during pull-up. Additionally or alternatively, the elastic deformability of the interlock tabs 1842, 1844 may allow a user to selectively disengage one or more of the front ferrule 1824, the rear ferrule 1830, and the fitting nut 1814 from the retaining device 1840, for example, by applying one or more of an axial, lateral, rotational, or pivoting force to the retaining device and/or ferrules, for example, to inspect, treat, or replace the detached component.
The inventive aspects have been described with reference to the exemplary embodiments. Modification and alterations will occur to others upon a reading and understanding of this specification. It is intended to include all such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
This application claims priority to and all benefit of U.S. Provisional Patent Application Ser. No. 62/305,071, filed on Mar. 8, 2016, for COMPONENT RETAINING STRUCTURE FOR CONDUIT FITTING, and U.S. Provisional Patent Application Ser. No. 62/437,149, filed on Dec. 21, 2016, for COMPONENT RETAINING STRUCTURE FOR CONDUIT FITTING, the entire disclosures of both of which are fully incorporated herein by reference.
| Number | Date | Country | |
|---|---|---|---|
| 62305071 | Mar 2016 | US | |
| 62437149 | Dec 2016 | US |
