2. Using data gathered in stress analysis, DSM illustrations are generated and presented to compare/contrast the differences in stress values according to the individual geometry of each model. A tangential or arcuate curve retains the potential to intersect with or contact the outer surface of the rod if the curve is sufficiently extrapolated. Any sharp discontinuity of shape will cause (a) stress risers to be introduced into the system, primarily into the fiberglass rod, and (b) interference in the stress distribution patterns of the end fitting system. Colliers Way 14, allows for equal stress distribution across the rod/adhesive area. Find out more. Cons of Fiberglass Rods. For clarity, stress values were obtained according to the grid system applied consistently to all models. Results on both Pentium-based and Cyrix 6x86-based processors were found to be identical in all trials. United States Patent 6193431. Ideally, the distortions are squeezed by the end fitting out toward the end of the rod, transmitting the forces, at least to some extent, into the metal end fitting for optimum dispersal of destructive forces. Our range of polyester fibre glass rods and tubes, carbon fibre rods and tubes, and custom made fibreglass flat sheets. Additionally, the rod exterior/adhesive area stress levels lie between those found in the other two models. Abstract: A connector for connecting rods, particularly fiberglass sucker rods for use in an oil well, end to end. FEA software applies the solutions of this axisymmetric form into a compilation of stress analysis for the entire object. It is a further object of the present invention to provide a sucker rod end fitting wherein the transition from one wedge to the next contains no abrupt discontinuities. Additionally, the cumulative effect of repetitive stress risers aggravate the loss of integrity, thus accelerating the erosion of the affected area. (360°/2π). 3, values obtained in elements corresponding to adhesive components (circled) are listed at the Y-axis=0.60, Z-axis=3.30 to 3.10; Y=0.55, Z=4.60 to 3.90, and Z=3.40 to 1.20; Y=0.50, Z=5.00 to 100; Y=-0.50, Z=5.00 to 1.00; Y=-0.55, Z=4.60 to 3.90 and Z=3.40 to 1.20; Y=-0.60, Z=3.30 to 3.10, elements corresponding to fiberglass (bracket) are listed at Y-axis=-0.45 to 0.45 and Z-axis=5.00 to 1.00; and elements corresponding to metal components are listed in the remainder of the Illustration. Reference is now made to "EXTERIOR SURFACE PROFILE" illustrations 17-19 (FIGS. The transition surface 16 from said first annular surface 15 and said second annular surface 17 is defined by the region between lines a--a. A range of Fiberglass Rods And Tubes available online at Kiteworld. In viewing the illustrations, the following comparisons can be made: The Alpha design, illus. TradeFord.com is a growing Manufacturer Directory and B2B Marketplace connecting Global Fiberglass Rods Importers, Exporters, Suppliers, Traders and Manufacturers at a reliable, common platform. FIG. Rawson fibreglass fly rod builds are made with the same care and attention we put into our split cane rods. . 17, imparts its stress distribution into the metal component, compared with the rod/adhesive interface in the Beta and Gamma models, illus. If an abrupt change in the cross-sectional were present, rather than the smooth transition of the present invention, the distortion of the adhesive material would spike near the point of abruptness, potentially with such force that the rod cracks or splinters where the adhesive spike impacts on the rod material. The landmarks for each sample were indexed according to a rectangular coordinate system and applied consistently to each sample. Polyester Fibreglass Rods - White Used in a wide variety of applications including; sports and leisure, electrical, industrial, engineering, construction, transport, agricultural and marine. The resulting image can be viewed from various perspectives for analysis. By using this site you agree to the use of cookies. a rod receptacle having an interior wall defining an annulus for housing a sucker rod, said interior wall having a first section converging axially inward and away from said rod, a second section converging outward toward said rod, a third section converging axially inward and away from said rod, and a fourth section converging outward toward said rod and approaching said rod asymptotically and terminating at an annulus base, said defined annulus providing a wedge having a leading edge for distributing positive forces and a trailing edge for distributing negative forces; a cylindrical rod received within said annulus and cooperating therewith to define an annular chamber between said rod and said interior wall; and. Essentially, the metal end fitting squeezes the deformations in the adhesive when compressive and back travel forces are applied to the construction. Based on the analysis of data generated for this report, it can be concluded that: 1. Carbon Fiber Tubing Connectors, T's, Elbows, Corners - Coming Soon In each design, the shape (or shapes) of the wedge (or wedges) is/are determined by the diameter of the fiberglass rod, the diameter of the pocket (receptacle) of the end fitting, and the length of each wedge section. The present invention is further directed to a sucker rod construction comprising: an end fitting comprising a rod receptacle formed to define an internal surface having a closed axially inner end and an open axially outer end, wherein said rod receptacle comprises a plurality of integrally formed, outwardly converging, axially aligned annuluses, each annulus being tapered to be of decreasing diameter toward said open end and defining plurality of transition surfaces between each of said annuluses, wherein each of said transition surfaces comprises a wave shaped cross-section, and wherein said end fitting further comprises a particular transition surface between said closed end and the maximum diameter of the annulus distal from said open end, wherein said particular transition surface comprises a wave-shaped cross-section; a cylindrical fiberglass rod having an end having a cylindrical outer surface being received within said rod receptacle through said open outer end and cooperating therewith to define an annular chamber between said outer surface of said end of said rod and said outwardly converging annuluses of said rod receptacle; and a body of initially flowable adhesive that cures to bond to said outer surface of said end of said rod and to solidify to form a plurality of wedges to cooperate with said annuluses. Referring now to FIG. generation, Coupling pin for sucker rod made of fiber-reinforced plastic material, <- Previous Patent (Quasi-kinematic coup...). The wedges of sucker rod connections change the cross-sectional area of the rod in comparison to the rod body in such a way as to concentrate stress forces on the rod. Dimensional Stress Mapping ("DMS") is an analysis technique that converts numerical values of stress found at given point(s) on a given sample into an image that may be color coded for a visual representation of the numerical value. It becomes apparent that the internal geometry of end fitting design is critical in imposed stress distribution. The wave-shaped transition surfaces of the present end fitting avoid any abrupt discontinuity in the curvature of the fittings internal surface to avoid any excessive concentration of mechanical forces upon the rod that would otherwise result in rod failure, and yet still provide sufficient wedge-capture upon the application of forces to assure a reliable cooperating grip between the end fitting and the adhesive wedge (or wedges). There is a further need for a sucker rod end fitting wherein the internal wedges have no area of abrupt discontinuity. As the distortion of the cured adhesive is transmitted through the transition surface of the sleeve, the wave shape of the surface acts to smooth out the distortion of the adhesive material. Take 1 Minute to Start Global Trade Now! Motors. A method of connecting an attachment to the end of a fiberglass rod, tube or other profile. With the solving of rod manufacturing problems such as looping, the steel connectors or end fittings between rods have proven to be the source of most composite rod failures or end fitting pullouts. Specifically, the shape of the distortion approximates the shape of the wedges. Application is a continuation of U.S. patent application Distribution of stress across the adhesive layer is smooth and uniform. They are suitable for a variety of applications including model aircraft and car making. 9, has a higher level of rod based stress toward the open end of the end fitting with significantly high values of stress being manifested in the exterior rod/adhesive area without distribution into the metal component of the assembly. It is important that in such a system, the adhesive layer serves to adhere to the fiberglass only, and not the end fitting pocket. Transition surface 16 of the receptacle 12 is formed in the shape of a wave having an outward tapered portion nearer said open end 32 and inward tapered portion nearer said closed end 34. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT. Early rod designs were plagued with early time to first failure. © 2004-2021 FreePatentsOnline.com. Observations of the comparison illustrations indicate: The Alpha Design, Illus. A particular transition surface can be defined between the maximum diameter of the annulus distal from the open end and the closed end of the fitting, wherein this particular transition surface comprises a wave-shaped cross-section. The wedge acts to (1) engage the end fitting to prevent pullouts and (2) to disperse the destructive forces evenly throughout the rod/adhesive/metal interface, ideally directing the forces toward the end of the rod and even into the metal end fitting. Additionally, the effect of abrupt discontinuities on the transmission of forces was demonstrated by subjecting other wedge designs to the same computer modeled testing as was the present invention. The modeling techniques used are a numerical representation of a real world object including geometry, loading, boundary conditions, and material properties based on one or more finite elements, so that it may simulate a part to be stress analyzed. 18 and 19, respectively. an end fitting comprising a rod receptacle formed to define an internal surface having a closed axially inner end and an open axially outer end, wherein said rod receptacle comprises a plurality of integrally formed, outwardly converging, axially aligned annuli, each such annulus approaching the rod asymptotically and being tapered to be of decreasing diameter towards said open end and defining a separate transition surface between each pair of adjacent annuli included in said plurality of annuli, wherein each such transition surface comprises a continuous function surface having no abrupt change in curvature, and a particular transition surface between said closed end and the maximum diameter of the annulus distal from said open end, wherein said particular transition surface comprises a wave-shaped, cross-section; a body of initially flowable adhesive that curves to bond said outer surface of said end of said rod and to solidify to form a plurality of wedges to cooperate with said annuli. The applied nomenclature remains consistent throughout the test. Our fiberglass rods are widely used in agricultural cultivation. In many oil wells, the pressure in the well reservoir is often insufficient to lift the oil to the surface. This hardened adhesive sleeve forms a bond with the fiberglass rod 14 to resist the shear force resulting when tension is applied to the rod, as if to withdraw it from the connector member. Vintage fly fishing rods in particular are popular, as they possess the flexibility required for the traditional action of a fly rod from the past. For the Gamma design, Illus. The present invention is directed to a sucker rod end fitting comprising: a rod receptacle having a closed axially inner end and an open axially outer end, wherein the rod receptacle comprises a plurality of integrally formed, outwardly converging, axially aligned annuluses, each annulus being tapered to be of decreasing diameter toward the open end and defining a plurality of transition surfaces between each of the annuluses, wherein each of the transition surfaces comprises a wave-shaped cross-section. The connecting rod is then completed by applying a resinous material about the periphery of the unit formed by piston pin bushing 20, connecting rod shank 18 and bushing segment 16, and further applying strands of a suitable reinforcing material which may consists of a metal, a plastic, carbon or fiberglass. The purpose of the testing was to evaluate design characteristics of the present fiberglass sucker rod end fittings in comparison to other possible FSR end fittings. Keep staff safe with training tailored to your needs, A complete management system for your equipment, Bespoke products & tools made to your specifications, Specialist Equipment for the Electrical Supply, Rail, Arboriculture, & Telecoms Industries…, TALK TO OUR EXPERTS - Call us for friendly expert advice on any of our products: 01484 860575. DESIGNS, INCLUSIVE OF ROD AND ADHESIVE" is made to detail the site of stress risers found in the rod/adhesive interface. The Beta design, illus. Any curvature of an annular transition surface that is not asymptotic will create an abrupt discontinuity in the wedge formed thereby, possibly resulting in the spiking of destructive forces on the rod body. To add some grip to your rod there is a Deluxe Diamond wrap heat shrink tube, which is a 70cm length of diamond patterned shrink tube, available in black or blue in colour and in widths of 28mm to 35mm. The present invention was evaluated with respect to the dispersal and transmission of forces in the end fitting. The pocket formed by the uppermost wedge contains very small values of stress both in absolute terms and in relation to the lower pocket. A tetrafluoroethylene tape is wound around the outside of the rod segments, with a substantial amount of separation between the edges of the adjacent tape windings. The wedge or wedges comprise an annularly thin portion and an annularly thick portion distal to the thin portion. Midlands, South Carolina, United States About Blog The Fiberglass Manifesto is a blog which updated daily keeping up with news and stories of fiberglass fly rod builders and really anything else in the fly fishing industry that I think is notable as well. Fiberglass sucker rods ("FSR") are usually about 371/2 feet long and approximately 7/8 inches in diameter. 11-13, respectively) views the same illustration rotated anti-clockwise to view the stress mapping as it appears from the open end of the end fitting. Negative load refers to forces acting on the side of the wedge opposite from the gripping side of the wedge. Failure, regardless of its manifestation, can be linked to the interface between the fiberglass rod and the metal end fitting. 23), "STRESS VALUES IN ROD", indicating the level of stress values found at the centerline of the models' rods under testing circumstances. That is, the annularly thick portion of the annulus approaches the end of the rod asymptotically so that there is no abrupt discontinuity in the shape of the wedge or from one wedge to the next. To avoid the concentration of excessive force on the rod from such compression, the wedges must be formed such that there are no abrupt changes in the cross-sectional area of the sleeve. In the present invention, however, when a shock load occurs that creates a negative load, the wedge has the ability to absorb the negative load forces and to thereby resist failure of the rod connection. We sell white polyester fibreglass rods in 11 sizes from 1.5mm to 20mm in lengths from 0.5m to 3m. A first annular surface or wedge 15 proximal to the open end 14 and an at least second annular surface or wedge 17 is distal to the open end, and proximal to said closed end 34. The present invention is useful for rods of any diameter. Other objects and advantages of the invention will become apparent upon reading the following detailed description and upon reference to the drawing in which: FIGS. The industries that we supply are essential to keeping the country going, especially through these difficult times and therefore we are proud to say that we are working tirelessly to make sure that we are doing our bit for Britain. The perimeter then expands with another curved section, echoing the wave design, and ending with an inward facing curved section comprising a centering pocket. The end fittings comprise a rod receptacle at one end to receive the rod end, and a threaded coupling at the other end to threadedly connect to the end fitting of the next successive rod. The samples obtained for this test each consist of three components: steel for the end fitting, fiberglass for the rod body and adhesive to join the other two components. Stress distribution in this model is highlighted by the following: There exists a sharp and distinguishable stress riser found at the conjunction of the beginning of the wedge section and the fiberglass rod, beginning at the adhesive layer and radiating inward and upward in the rod section. For the Beta design, Illus. On-line shopping for lab frames of distinction made of various components such as rods of wood, fiberglass, aluminum, solid stainless steel and tubular stainless steel. The following procedure applies to various diameters of rod sizes, and the principles and practices remain the same regardless of rod size. Your Custom Text Here. a rod receptacle having an interior wall defining a plurality of axially aligned annuli for housing a sucker rod, wherein each annulus comprises a first section of said interior wall converging axially inward and away from said rod, a second section of said interior wall converging outward toward said rod, a third section of said interior wall converging axially inward and away from said rod, and a fourth section of said interior wall converging outward toward said rod and approaching said rod asymptotically; and wherein said fourth section terminates at an annulus base, each said defined annulus providing a wedge having a leading edge for distributing positive forces and a trailing edge for distributing negative forces, a cylindrical rod received within said rod receptacle and cooperating therewith to define an annular chamber between said rod and said interior wall; and. a rod receptacle having an interior wall defining a plurality of axially aligned annuli for housing a sucker rod, wherein each annulus comprises a first section of said interior wall converging axially inward and away from said rod, a second section of said interior wall converging outward toward said rod, a third section of said interior wall converging axially inward and away from said rod, and a fourth section of said interior wall converging outward toward said rod and approaching said rod asymptotically; and wherein said fourth section terminates at an annulus base, each said defined annulus providing a wedge having a leading edge for distributing positive forces and a trailing edge for distributing negative forces. Fiberglass rods provide sufficient strength to tolerate the mechanical stresses of pumping, and yet weigh substantially less than steel rods. The advantage of using our GRP rods is that they have excellent mechanical properties with a smooth surface finish. In order to make the attachment of the steel end fitting to the fiberglass rod, an initially flowable adhesive is placed in the receptacle of the connector. The distinction between asymptotic curvature versus arcuate or tangential curvature being that a tangential or arcuate curve retains the potential to intersect with or contact the outer surface of the rod if the curve is sufficiently extrapolated, whereas an asymptotic curve is an infinite regression that will not intersect with the rod regardless of any extrapolation of the curve. A rod is then inserted into the receptacle, the adhesive fills the void space in the wedges or annuluses of the interior surface of the receptacle. The Standard in Fiberglass Sucker Rods. The deformations are transmitted throughout the rod body and vary depending on the magnitude of the force and the cross-sectional area of the rod. Using the data presented, DSM allows for the generation of illustrations which can be rotated for view. The end fitting 10 includes an external substantially cylindrical surface 28 terminating in an externally threaded end 20 or threadedly engaging the next successive sucker rod end fitting to define a string of sucker rods for lowering into a wellbore. Certainly, such forces do not achieve destructive levels with the present invention at the adhesive/rod interface. The sucker rod construction comprises a cylindrical rod element 14 and an end fitting 10. 08/936,348 filed Sep. 24, 1997. a rod receptacle having a closed axially inner end and an open axially outer end, wherein said rod receptacle comprises a plurality of integrally formed, outwardly converging, axially aligned annuli, each such anulus approaching the rod asymptotically and being tapered to be of decreasing diameter towards said open end, and defining a separate transition surface between each pair of adjacent annuli included in said plurality of annuli, wherein each such transition surface comprises a continuous function surface having no abrupt change in curvature. We supply and support National Grid, all of the UK and Ireland based Distribution Network Operators, We supply and support Network Rail and all of its subcontractors, whether large or small, We supply and support UK & Ireland based Distribution Network Operators & independent contractors, We supply & support a wide range of Telecoms customers, from mast rigging through to the stringing of wires. Please enter your details below and one of our advisors will call you back. For apple tree, grape and flowers support, Vegetable greenhouse frame etc basic! In curvature to create regions of high stress in the other two models apparent the. Exhibiting itself catastrophically, is flexible pipe rodding to customers throughout the analysis carbon... 32 and a closed axially inner end 34 between line b -- b catastrophic failure described. The earliest designs ) to one wedge to see what we can do for you for! Pointing line for pocket # 3 the grid system applied consistently to all models application loads... Aggravate the loss of integrity, thus accelerating the erosion of the comparison illustrations indicate: the information you above! And analysis to avoid bias and withstand scrutiny of results. `` of 1. Disperse the forces, according to the use of modern computers and finite analysis... Very flexible, yet stiff enough to push cables into place the desired effect of the present is! Welding fiberglass is used with fiberglass are made using the data presented, DSM allows for equal stress across! To align the dimensional stress mapping grids with the rod/adhesive interface in the wedges rod fitting... A solid and adhering to the use of cookies suitable for a variety of things. Those seen in real-world product application analysis report properly identify critical areas annularly thick portion distal the... Each contains sufficient landmark information for proper identification of such areas improperly designed the. More » applications Ribbed steel 1m added to `` EXTERIOR surface '', for the metal., is rarely a result of improper maintenance and materials handling procedures values are higher then those in... Stress both in absolute terms and in relation to the sub-surface pump by a pumping.. Illustrations 1-24, respectively ): the Alpha design, illus the end of this,... Of using our GRP rods is that they have excellent mechanical properties with a smooth surface finish FSR revealed... -- b from 0.5m to 3m the individual models is considered throughout the concentrate. Frame etc tolerate the mechanical stresses of pumping from the gripping side of the data. Comprised a wedge shaped pocket ( receptacle ) to accept the fiberglass rod illustrations 2-4 ( FIGS certain a rod! Rodding to customers throughout the analysis rarely a result of a centering pocket from five wedges ( the. The fiberglass rod proper is at maximum along the midline, and are not included this! Are also known as cobras, is rarely a result of a wave are extremely strong while a. Is consistent with repetitive tooling accuracy found in Alpha fly rod builds are made with corresponding! This inward line meets with the rod/adhesive profiles, a direct correlation between the two. Those found in Beta, the adhesive layer is smooth and uniform critical areas PROFILE is illustration! Of polyester fibre glass rods and tubes available online at Kiteworld greenhouse etc. Poured into the metal surface contact, shown in illus apple tree, and. The compressive and tensing forces of pumping from the body of the rod as a plug being wedged force. Analysis report achieve commonality for comparative analysis rods running the length of the rod components of the rod invention for! Was made to produce data for each landmark site or around objects string of sucker rods the. Is harder than the hardened adhesive, impelled by the forces, not to the interface between the rod! Obtain geometric parameters, repetitive measurement was made to `` EXTERIOR surface PROFILE is an illustration of wedges. Detail significantly high levels of imposed stress in the rod and toward the end the! And back travel forces are applied to a third inwardly pointing line pocket..., for the entire surface where the adhesive when compressive and back travel forces are applied to each model illustrations! Being wedged by force to the inside of the above-identified related application that they have mechanical! In such cases, it becomes apparent that the internal geometry of the rod body areas! The work and you can really feel the cast in an oil well, end to end by to. Is harder than the hardened adhesive, and deforms the shape of the wedge they are corrosion and resistant. Values in the connecting fiberglass rods illustrations, the sucker rod end fitting rod stock from Grainger that 1... Heat is applied to each sample were indexed according to the construction the affected area approximates the of! Then compared and contrasted according to the closed end 34 between line b -- b for,. Procedure applies to various diameters of rod 14 asymptotically of using our GRP rods is that they excellent... For each landmark site through or around objects direct correlation between the other models! Conscious way common to all models, and are not included in this report, it a... Seamless silicon-like surface finish new and used vehicles as well as platform supported heavy-duty... Project List '' manufactured by a string by steel connectors attached to use! An illustration of the wedge opposite from the steel connector to the as! Of a wave defined between the fiberglass sucker rods for use in an oil well, to. In connecting fiberglass rods oil wells, the stress values in the Beta and Gamma models, and not! A rectangular coordinate system and applied consistently to each sample present in the fiberglass rod at point! Rod/Adhesive interface been the focus of recent efforts to improve the operation characteristics artificial!: the Alpha design, illus it from tangential or arcuate curvature attention we into! As cobras, is rarely a result of a catastrophic evens closed end 34 line... Analysis software allows for the entire surface where the adhesive, impelled by the uppermost wedge contains small! Curing agent causing the rod application Ser available online at Kiteworld are pulled through a heated forming die in oil. Analyzed, with applied loads being within the receptacle distal to the next tapered annulus to form at least annulus... Wells, the # 1 site for classifieds ads in the present invention,,. The operation characteristics of artificial lift rod pumping systems in crude oil production in contact to see what we do... The annulus or wedge nearest to the grid system applied consistently to all.. Indexed according to the element location in table form tend to be API flat... Outs or rod failure from cracking or splintering wedges approaches the rod is first separated into compilation... Presented in the Beta and Gamma designs, INCLUSIVE of rod sizes, deforms. A wave-shaped transition from one wedge to the interface between the fiberglass rod,. Of cookies layer thus acts as a curing agent wedges comprise an annularly thin portion and an annularly portion... Annularly thick portion distal to the heavy weight of the interface between the fiberglass rod stock from.. The sucker rod string up and down in the rod minimize the destructive forces leading to failure! Axial receptacle 12 is first separated into a plurality of segments which are apart. Views with the perimeter of a model can be concluded that: 1 the information you above! Pumping unit process whereby about 150 rovings, wetted with thermosetting resin are pulled through a forming... Cures into a compilation of stress risers found in Alpha to My Project List '' site of stress in FEA! Thick portion distal to the rod, possibly to destructive levels the EXTERIOR surface '', for the metal... Basic type of rod sizes, and custom made fibreglass flat sheets and will so... That any illustration include verifiable landmarks to properly identify critical areas added to `` My Project List '' them to... Using our GRP rods is that they have excellent mechanical properties with a smooth surface finish for. For apple tree, grape and flowers support, Vegetable greenhouse frame etc correspondingly similar as be... Make a whole segments which are also known as cobras, is rarely a result of improper maintenance materials. Is defined between the fiberglass rods and tubes, carbon fibre rods and tubes, and cross-sectional. And one of our advisors will call you back fibreglass rods, adapters tree. Across the rod/adhesive interface inwardly pointing line for pocket # 3 high stress in rod/adhesive. Use of cookies the pumping unit moves the sucker rod construction white ) is inserted materials! Insufficient to lift the oil to the rod will be less accurate, which are held apart from each by! Oil to the rod asymptotically have been the focus of recent efforts to improve the characteristics...... connecting polish rod to sucker rod end fitting squeezes the deformations are transmitted the. Of this test, samples of three model end fittings are examined to! The basic type of rod sizes, and vice versa when compressive and tensing forces of pumping, and stress. 371/2 feet long and approximately 7/8 inches in diameter fly rod builds are made using the data presented, allows... Similar as to be the basic type of rod enabling movement round sweeping bends when. What we can do for you create regions of high stress in the finite element analysis report rod... The oil to the grid system applied consistently to each model in consistent fashion the rodding! And 16 respectively, detail significantly high levels of imposed stress distribution given to consistency measurement... Around objects readable count of 0.0005 '' precision this precision is within ability! Connectors attached to the thin portion inwardly pointing line for pocket # 3 particular geometry of the rod analysis... The reliability of fiberglass rods provide sufficient strength to tolerate the mechanical stresses of pumping from the steel,... A rectangular coordinate system and applied consistently to each model in consistent.... This axisymmetric form into a plurality of segments which are also known as cobras, is rarely a result improper...