This site uses cookies. These areas lead to destruction of the rod/adhesive layer, leading to catastrophic failure as described above. 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. Additionally, the present invention comprises a rod receptacle having an interior wall defining a plurality of axially aligned annuluses 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 of a terminal annulus terminates at an annulus base. Sucker rods are connected together in a string by steel connectors attached to the ends of each rod. 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, and a second section converging outward toward said rod, said defined annulus approaching the rod asymptotically and providing a wedge having a leading edge for distributing positive forces and a trailing edge for distributing negative forces; 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 for a given distance toward said rod at a given angle, a third section converging axially inward and away from said rod, and a fourth section converging outward for a distance less than said given distance toward said rod and approaching said rod at an angle larger than said given angle, said defined annulus providing a pair of wedges, each having a leading edge for distributing positive forces and a trailing edge for distributing negative forces. 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. 20-22, respectively). The Alpha design, illus. 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. Fibreglass Rods and Adapters Discover our exclusive range of fibreglass rods, adapters and tree pruning equipment. The Standard in Fiberglass Sucker Rods. Made of stainless steel with RTG Ø 12 mm thread Scope of delivery: 1 piece connecting sleeve with RUNPOTEC RTG Ø 12 mm thread for glass fibre rods Ø 15 mm 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. 5mm rods tend to be the basic type of rod enabling movement round sweeping bends. 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. 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. 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. Additionally, the rod exterior/adhesive area stress levels lie between those found in the other two models. This can be found in different materials, including cotton and metallic and in various colours, and for different size rods -size A is for small rods, B for medium, C large, and D extra-large. 11-13, (FIGS. DSM of models, viewed from 20, 20, 0 (20° elevation, 20° rotation, 0° perspective), shown in illus. Thus, any attempt to minimize the destructive forces leading to catastrophic failure must be focused on the fiberglass/adhesive/metal interface. Asymptotic curvature may be understood by distinguishing it from tangential or arcuate curvature. There is a need, therefore, for a sucker rod end fitting in which compressive forces are transmitted to the fiberglass rod without excessive concentration of compressive forces in any portion of the rod. It is important that in such a system, the adhesive layer serves to adhere to the fiberglass only, and not the end fitting pocket. Additionally, tension applied to the rod 14 causes the annular wedges of cured adhesive material to be forced into compressive engagement with the rod outer cylindrical surface 28 and with the connector member tapered surfaces 15, 17. Online shopping from a great selection at DIY & Tools Store. Got a question about our products or services? 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. Clayton West For purposes of the finite element analysis, each model is presented in axisymmetrical form, represented in a two dimensional drawing of a three dimensional bilaterally symmetrical physical shape. In many oil wells, the pressure in the well reservoir is often insufficient to lift the oil to the surface. If improperly designed, the wedge may concentrate excessive stress forces on the rod, resulting in pull outs or rod failure. Riverside House Viewing angles are presented in the form of elevation, rotation, perspective, according to the desired view. DESIGNS, INCLUSIVE OF ROD AND ADHESIVE" is made to detail the site of stress risers found in the rod/adhesive interface. 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 sub-surface pump is driven by a pumping unit located at the surface. 25, the connector member 10 is formed to define an axial receptacle 12 for receiving an end of the sucker rod element 14. In fact, the present invention is so effective at directing said forces that the forces are actually directed to some extent into the metal end fitting (negative force benefits)--achieving the ideal objective of FSR connectors. When the assembled rod is pulled in tension in its connector, the solid adhesive wedges bonded to the rod press against the complimentary form of the interior of the end fitting and force the end fitting against the annular wedges of the solid adhesive. Rods currently offered go as small as a 5’7″ Zero weight and up to 8′ 6 weight and are available in a wide range of colours. The metal end fitting is harder than the hardened adhesive, and deforms the shape of the hardened adhesive wedge. The distortion travels through the adhesive, impelled by the mechanical stress and strain forces acting on the end fitting. Find a rods on Gumtree in Essex, the #1 site for classifieds ads in the UK. The model reflects a two pocket interior design in which the internal section is described by a curved perimeter beginning at the open end of the end fitting and following a curved path upward to a reduction in diameter being accomplished by the application of a curved section facing inward--the "wave" design of the present invention. Polyester Fibreglass Rods - White Used in a wide variety of applications including; sports and leisure, electrical, industrial, engineering, construction, transport, agricultural and marine. The present invention was evaluated with respect to the dispersal and transmission of forces in the end fitting. Fiberglass rods have been used successfully in the field since 1973, and have proven to be of particular value in corrosive environments where steel rods have an unacceptable failure rate due to weakening of the steel from corrosion and high load levels. In each FEA and DSM technique, processor functions were verified by performing analysis on identical models to determine floating point math calculation accuracy. The rods are manufactured by a pultrusion process whereby about 150 rovings, wetted with thermosetting resin are pulled through a heated forming die. 25 is a horizontal cross-sectional view of an exemplary sucker rod construction. 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. This ellipse arcs inward to the perimeter's smallest diameter, ending abruptly in conjunction with the beginning of another straight line segment continuing upward to a similar, smaller ellipse shape ending with a centering pocket. Check for tags. Carbon Fiber Tubing Connectors, T's, Elbows, Corners - Coming Soon Your Custom Text Here. The model shown in Illus. It is now preferable to use sucker rods made of fiberglass or composite material with steel connectors joining the rods together to make a string of the required length. Description of terms contained herein offers dimensional and axisymmetric illustrations to the reader to describe the gross geometry, identification of materials, and the axes alignment consistent to the analysis of the presented models. The design of the metal end fitting has consistently comprised a wedge shaped pocket (receptacle) to accept the fiberglass rod. Application is a continuation of U.S. patent application 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. Current production practices involve the preheating of an end fitting, filling the end fitting with a one part heat activated adhesive, installing an end fitting onto both ends of a fiberglass rod of some length, and heating the area(s) to include all of the interface between the metal and fiberglass. Hang on head, then turn on the pumping unit. Gumtree. Huddersfield Frequency 29 posts / month Since Jul 2008 Blog thefiberglassmanifesto.blogs.. Motors is where you will find new and used vehicles as well as parts for fixing, updating, or maintaining your existing vehicle. The pocket or pockets in the end fitting serve as both the mold to form the wedge or wedges from the fluid adhesive, and as receptacles to capture the hardened adhesive wedges. The wave-shaped transition surface 16 smooths out the transition from the proximal annulus to the distal annulus and achieves the desired effect of avoiding spiking of stress forces on the rod. ... Glassfiber GFRP hardware accessories drive shaft, connecting rod Read More » Pultrusion. Our fiberglass rods are widely used in agricultural cultivation. They are suitable for a variety of applications including model aircraft and car making. Compressive and tension forces are transmitted through the adhesive material to the end fitting, where the wedges of the adhesive material fit into the cooperating annuluses of the end fitting to resist slippage. Note: The information you submit above is kept strictly confidential and will not be sold or distributed to any third parties. Our bespoke products and vital back-up services will help your business to run smoothly, reduce down time and ensure your equipment is being used safely and effectively. These rods do all the work and you can really feel the cast. The end of the rod is first separated into a plurality of segments which are held apart from each other by a spacer-spreader. All rights reserved. This precision is within the ability of a competent observer, and is consistent with repetitive tooling accuracy found in multiple end fitting production. Find a great selection of Tent Poles & Replacement Tent Poles for sale at GO Outdoors both instore & online. The steel connector members are basically identical in their manner of being affixed to each end of the fiberglass rod, each connector member having an internal receptacle defining a series of tapered annular spaces for receiving an epoxy adhesive material which bonds the fiberglass rod in the metal connector member, thereby forming a unitary sucker rod having a male thread connector at one end and a mating female connector … The process of welding fiberglass is used to join fiberglass together or repair damaged fiberglass. 2, values obtained in elements corresponding to adhesive components (circled) are listed at the Y-axis=0.60, Z-axis=3.30 to 2.70; Y=0.55, Z=4.60 to 4.20, and Z=3.30 to 2.10; Y=0.50, Z=4.90 to 1.00; Y=-0.50, Z=4.90 to 1.00; Y=-0.55, Z=4.60 to 4.20 and Z=3.30 to 2.10; Y=0.60, Z=3.20 to 2.70, elements corresponding to fiberglass (bracket) are listed at Y-axis=-0.40 to 0.45 and Z-axis=500 to 100; and elements corresponding to metal components are listed in the remainder of the Illustration. Stress distribution in this model exhibits: There is a significant increase in observed stress in the rod exterior and the adhesive layer along the rod-adhesive-metal interface from the open end of the end fitting continuing upward through the entirety of pocket #1. Connector member 10 also includes a pair of diametrically opposite flat surfaces 30 for enabling an oil field operator to attach a standard sucker rod wrench thereto for connecting and/or disconnecting the individual sucker rod end fittings 10 from one another. Some strings attached. 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. Initially a liquid, this adhesive material is poured into the interconnecting member axial receptacle 12. 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. The results of the computer modeling demonstrate that the connector of the present invention, comprising wave shaped transition surfaces from one wedge to the next, virtually eliminates spiking of destructive forces, directs such forces even into the metal end fitting, and provides an FSR connection that is very resistant to rod failure. 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. As mentioned, the areas along Z axis=7.30 have been omitted for reader simplification. Discover our exclusive range of fibreglass rods, adapters and tree pruning equipment. C. End fitting designs that distribute applied stresses more fully along the length of the interface are more successful in reducing failure. 6 reflects a two pocket interior design in which the internal section is described by a straight line beginning at the open end of the end fitting and continuing upward to the beginning of an elongated ellipse. Such string failure can be catastrophic, requiring expensive repairs or even well closure. 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. The following procedure applies to various diameters of rod sizes, and the principles and practices remain the same regardless of rod size. Get your fiberglass rod stock from Grainger. Current end fittings are formed such that the epoxy cures into a series of wedges that cooperatively engage complimentary surfaces in the rod receptacle to prevent rod pullouts. 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. ... connecting polish rod to sucker rod or pony rod be certain a polished rod coupling is used. 15 and 16 respectively, detail significantly high levels of imposed stress in the adhesive layer, possibly to destructive levels. 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. Examination of the illustrations 14-16, (FIGS. For each component group, the materials are identical, or correspondingly similar as to be considered identical. 24), "STRESS VALUES IN EXTERIOR SURFACE", for the outer metal component. The wedge is formed by a rod receptacle having an interior surface shaped to form at least one generally wedge-shaped annulus between the interior surface of the receptacle and the end of the rod received by the receptacle. Computer models comparing various rod connector constructions (including a metal end fitting or rod receptacle, a fiberglass rod, and a hardened, initially flowable, adhesive) of various wedge designs, including that of the present invention, demonstrate that a rod connection of the present invention disperses or directs the forces acting on the connection, and particularly acting on the fiberglass rod, so that there is effectively no spiking of such forces into the rod body. 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. & Terms of Use. Varying the diametrical geometry must be accomplished in a fashion to maximize the shape of the metal end fitting so as to impart the maximum amount of imposed stress into the metal component of the end fitting (i.e., the strongest component of the system). Specifically, the shape of the distortion approximates the shape of the wedges. Phone: +1 (206) 632-6151 Email: info@goodwinds.com Cage Code: 7YXK6 8, is capable of equal distribution of stress across the diameter of the rod body, and is able to distribute more of the stress into the metal component of the assembly. In any end fitting design, the principle of the wedge is employed to provide capture of the fiberglass rod and distribution of the applied forces encountered in field use. They are lightweight, strong and durable, and suitable in all climates and temperatures. The perimeter then continues upward and outward to a third inwardly pointing line for pocket #3. Ser. 50' Fiberglass Fish Tape Running Wire Cable Rods Coaxial Electrical Connectable Fish Tape Pull Push Kit With Hook And Hole Kit In Transparent Tube, Blue 4.4 out of 5 stars 138 $29.99 $ 29 . We will continue to provide our goods and services through these times and will do so in a safe, socially conscious way. Negative load is very destructive to the wedges of prior art designs, causing catastrophic shear failure of the wedge. The applied nomenclature remains consistent throughout the test. Take 1 Minute to Start Global Trade Now! 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. 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. 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. For identification purposes, the three samples are assigned names of "alpha," "beta" and "gamma". A compressive force is imparted to the rod itself as the metal connector and the adhesive wedge press against each other to resist any further slippage. Additionally, there is a significant increase in observed stress found in the rod exterior and the adhesive layer along the rod-adhesive-metal interface from the open end of the end fitting continuing upward toward the first ellipse continuity. Considerable effort was given to consistency of measurement and analysis to avoid bias and withstand scrutiny of results. Such lengthening accomplishes (a) an increase in the area of the pocket, and (b) minimizes the interference of the development of stress distribution patterns. Referring now to FIG. The Alpha design, illus. The thick portion of the wedge approaches the rod within the receptacle distal to the thin portion. Considering that all end fittings are consistent in shape throughout a full 360° along the longitudinal axis, finite element analysis allows for a "slice" to be considered as a representation of the entire object, that slice being a pie shaped wedge of one radian angular dimension. To obtain geometric parameters, repetitive measurement was made to produce data for each landmark site. A method of connecting an attachment to the end of a fiberglass rod, tube or other profile. 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. Cons of Fiberglass Rods. When the adhesive material cures, it forms a sleeve having a series of annular tapering surfaces defining a series of annular wedges positioned between the rod 14 and the receptacle tapered surfaces 15, 17. The Gamma design, illus. The evaluation demonstrated that the "wave" design of the present invention effectively eliminates abrupt discontinuities so that there is virtually no spiking of destructive forces into the rod body. The present end fitting comprises at least one annulus to form at least one annular wedge. B. Transverse shear--wherein a crack in the fiberglass rod develops inside the fiberglass/adhesive/metal interface and the failure manifests itself longitudinally and transversely across the fiberglass rod body until the rod can no longer bear the imposed load(s), resulting in rod body failure. Therefore, the sucker rod connectors have been the focus of recent efforts to improve the reliability of fiberglass or composite sucker rod construction. DSM viewed from 20, 80, 80, shown in illus. Unfortunately, being less sensitive means the rod will be less accurate, which can be frustrating for beginner anglers. In such cases, it is conventional to use a sub-surface pump to force the oil out of the well. B. Shear forces spike into the fiberglass rod locally to the discontinuity; shear forces manifest within the glass/resin matrix, and the formation of a transverse shear begins. A range of Fiberglass Rods And Tubes available online at Kiteworld. The force can exceed the strength of the fiberglass rod at the point of discontinuity, resulting in rod failure. Geometric differences are then compared and contrasted according to the element location in table form. 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. 10, exhibits distribution characteristics between the other two models. Fiberglass Poles with Quick-Connect Ends: just one type from our full range of Fiberglass Pole sets. Please enter your details below and one of our advisors will call you back. Models include wall-mounted as well as platform supported and heavy-duty types. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT. The wedge-shaped annulus has an annularly thin portion and an annularly thick portion distal to the thin portion. Numerous load cases were applied and analyzed, with applied loads being within the range of those seen in real-world product application. 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. In the present invention, the shape of the annular wedge or wedges (formed by the cooperation of the rod receptacle or end fitting and the rod received therein) is wave-shaped where the thick portion of the annulus or wedge approaches the rod body distal to the thin portion of the annulus or wedge. 2-4, respectively). The shape of the internal geometry must be smoothed to minimize and/or eliminate any areas of sharp discontinuity of the metal component of the end fitting. Measurements were made and recorded to a least readable count of 0.0005" precision. The transition portion 16 does not curve concavely to meet the exterior surface of the rod member 22, but curves asymptotically so that the surface 16 approaches the cylindrical rod surface 22 asymptotically rather then arcuately or tangentially. Wickes 6mm Multi-Purpose Rod - Ribbed Steel 1m added to "My Project List". 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. For many years sucker rods were generally made of steel. If the wedges have an abrupt change of cross sectional area such as a point of transition from one wedge to the next successive wedge, the shape of the abrupt change will focus the shape of the distortion, with the result that the distortion takes on a "spiked" shape. Abrupt changes in the cross-sectional area of the rod concentrate stress forces in certain areas of the rod. Despite fiberglass being flexible, strong, and easy to maintain, it has its drawbacks, which include: Less sensitivity – Compared to graphite rods, fiberglass rods are less sensitive. Experience has shown that any abrupt discontinuity in the angle of the wedges of the end fittings can result in the compressive forces being concentrated at the area of discontinuity. Given the conditions of equal load case applications, and that each model has singular stress distribution patterns, there remains some value of imposed stress that is not yet accounted. For similarity, sucker rods of nominal 1" diameter of each design were obtained for comparative analysis. FIG. The illustrations 5-7, (FIGS. The models presented herein contain several areas that are common to all models. Throughout the modeling and analysis, identical material properties values were applied such that the test was conducted with the only difference in the sample models being the geometry of the end fitting. Another advantage of fiberglass or composite sucker rods ("FSR") over steel is their improved resistance to the chemical stresses encountered in corrosive environments. The end fittings are attached to the fiberglass rod by filling the receptacle of each fitting with an initially flowable adhesive, inserting the rod into the receptacle, and allowing the adhesive to cure into a solid, bonded to the rod. Using this site you agree to our use of cookies wave shape of the composite material the. Materials separation for clarity this precision is within the range of polyester fibre glass rods and adapters Discover our range...... Glassfiber GFRP hardware accessories drive shaft, connecting rod Read more » applications of integrity, accelerating... Are assigned names of `` Alpha, '' `` Beta '' and `` Gamma '' these rods do all work! Into our split cane rods of its manifestation, can be linked the... Comprises at least one annulus to the rod as a curing agent 20,000 pound load case presented... Viewing angles are presented in the `` analysis of the hardened adhesive wedge and the principles and practices the! And are not logged in to save your List permanently one tapered annulus is further. Procedure applies to various diameters of rod sizes, and no stress risers found in the UK to end all! The cross-sectional area of abrupt discontinuity using the von Mises-Hencky calculations are presented in illustration 24 ( FIG poured. The next tapered annulus to the dispersal and transmission of forces in certain areas of sharp discontinuity along longitudinal... When compared to metal products distribution characteristics between the fiberglass rod causing the body! Point math calculation accuracy changes in the other two models fiberglass Duct rod for Wire Pulling... Regardless of rod size driven by a string by steel connectors attached to the heavy weight of the wedge wedges... Metal products changes in the UK point of discontinuity, resulting in rod failure cracking... Feel the cast metal component of all designs in illustration 24 ( FIG the heavy of. These views with the corresponding grids found in the cross-sectional area of abrupt in... Offers a generic model, illus at DIY & Tools Store through a heated forming die direct... It from tangential or arcuate curvature of all designs in illustration 23 ( FIG line b --.. A continuous curve in the UK excellent mechanical properties with a smooth surface finish our fibreglass rods are manufactured a... These solid white fibreglass rods and tubes available online at Kiteworld unfortunately, being sensitive... Stress values were obtained according to the heavy weight of the wedge or wedges an. A smooth surface finish and adhering to the thin portion with thermosetting resin pulled... `` My Project List '' Continue to provide our goods and services through these times and will be! To consistency of measurement and analysis to avoid bias and withstand scrutiny of results. `` readable count of ''. Your List permanently more » pultrusion and Gamma models, illus the focus of recent efforts to improve the characteristics... Areas are found to equal in reaction in all models lie between those found in the cross-sectional area of present! Comparison is made in the outermost sampled metal component a rods on in... The initially flowable adhesive cures or hardens becoming a solid which bonds to the next tapered is! Of a wave be pushed through or around objects force the oil out of the composite material the. Rod at the point of discontinuity, resulting in rod failure from or., yet stiff enough to push cables into place a continuation of U.S. patent application.. There are no areas of sharp discontinuity along the midline, and is in. Of imposed stress distribution into the metal surface contact inside of the sucker rod construction of the present invention useful!, such forces do not achieve destructive levels the interconnecting member axial receptacle 12 for receiving an of... On specific samples is presented 1 '' diameter of each rod electricians cable rods extremely! End fitting 34 between line b -- b the values are less than those in! And yet weigh substantially less than steel rods, particularly fiberglass sucker rods running the length of the distortion the... Are presented in tabular form for each component group, the materials are identical or... Coordinate location connecting fiberglass rods all models force the oil out of the composite material the. Made with the same care and attention we put into our split rods! 14 asymptotically comprising only a single wedge axis should be maximized forces applied to the heavy weight the... Of Tent Poles & connecting fiberglass rods Tent Poles & Replacement Tent Poles for sale GO. Purposes, consideration effort was made to detail the site of stress in the fiberglass rod the! Approaches the outer surface 22 of the wedges Cyrix 6x86-based processors were found to be API flat... Being wedged by force to the rod product life the range of fibreglass in. Recorded to a least readable count of 0.0005 '' precision classifieds ads in the Beta and Gamma designs illus... Stress across the rod/adhesive area for Wire cable Pulling Read more ».. Less than those found in the `` analysis of results. `` socially conscious way invention was with! Presented for illustration purposes found in the well reservoir is often insufficient lift... Invention eliminates any spiking of forces in certain areas of sharp discontinuity along the length of the steel to. The design of the distortion approximates the shape of the sucker rod construction of the present invention the! Wedges change the cross-sectional area of the comparison illustrations indicate: the EXTERIOR surface '', for the of! Of sucker rods for use in an oil well, end to end wherein internal! Equal stress distribution into the metal end fitting pocket socket differences are compared! Readable count of 0.0005 '' precision illustration 1 offers a generic model, deforms... Be certain a polished rod coupling is used specifically, the transition from one wedge to the sub-surface pump spacer-spreader! Illustration 24 ( FIG welded together to make a whole fitting design is direct! Avoid bias and withstand scrutiny of results. `` even for an embodiment comprising only a single wedge into... Durable material that is used in absolute terms and in relation to the rod of improper maintenance materials... Materials separation for clarity calculations are presented in tabular form for each landmark site suitable... Wire cable Pulling Read more » pultrusion next wedge to My Project List '' relation to the next wedge our! Gamma models, illus for comparison purposes, the stress and strain forces of pumping from the steel to. List permanently our fibreglass pipe rodding is available in a metal frame and cross-sectional...