WO1993018311A1 - A plug to be fixed to a tube by a glue joint - Google Patents

A plug to be fixed to a tube by a glue joint Download PDF

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Publication number
WO1993018311A1
WO1993018311A1 PCT/FI1993/000082 FI9300082W WO9318311A1 WO 1993018311 A1 WO1993018311 A1 WO 1993018311A1 FI 9300082 W FI9300082 W FI 9300082W WO 9318311 A1 WO9318311 A1 WO 9318311A1
Authority
WO
WIPO (PCT)
Prior art keywords
plug
glue
tube
joint
plug according
Prior art date
Application number
PCT/FI1993/000082
Other languages
French (fr)
Inventor
Juhani Hanka
Esa Pakarinen
Olli Saarela
Rob Stapels
Original Assignee
Neste Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Neste Oy filed Critical Neste Oy
Publication of WO1993018311A1 publication Critical patent/WO1993018311A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/53—Joining single elements to tubular articles, hollow articles or bars
    • B29C66/534—Joining single elements to open ends of tubular or hollow articles or to the ends of bars
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • B29C65/52—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding characterised by the way of applying the adhesive
    • B29C65/54—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding characterised by the way of applying the adhesive between pre-assembled parts
    • B29C65/542—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding characterised by the way of applying the adhesive between pre-assembled parts by injection
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/12—Joint cross-sections combining only two joint-segments; Tongue and groove joints; Tenon and mortise joints; Stepped joint cross-sections
    • B29C66/122—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section
    • B29C66/1222—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section comprising at least a lapped joint-segment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/12—Joint cross-sections combining only two joint-segments; Tongue and groove joints; Tenon and mortise joints; Stepped joint cross-sections
    • B29C66/122—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section
    • B29C66/1224—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section comprising at least a butt joint-segment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/13—Single flanged joints; Fin-type joints; Single hem joints; Edge joints; Interpenetrating fingered joints; Other specific particular designs of joint cross-sections not provided for in groups B29C66/11 - B29C66/12
    • B29C66/131—Single flanged joints, i.e. one of the parts to be joined being rigid and flanged in the joint area
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B15/00—Supports for the drilling machine, e.g. derricks or masts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B11/00—Connecting constructional elements or machine parts by sticking or pressing them together, e.g. cold pressure welding
    • F16B11/006—Connecting constructional elements or machine parts by sticking or pressing them together, e.g. cold pressure welding by gluing
    • F16B11/008—Connecting constructional elements or machine parts by sticking or pressing them together, e.g. cold pressure welding by gluing of tubular elements or rods in coaxial engagement
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D1/00—Couplings for rigidly connecting two coaxial shafts or other movable machine elements
    • F16D1/06—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end
    • F16D1/064—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end non-disconnectable
    • F16D1/068—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end non-disconnectable involving gluing, welding or the like
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
    • F16L55/10—Means for stopping flow from or in pipes or hoses
    • F16L55/11—Plugs
    • F16L55/1116—Plugs glued or welded
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • B29C65/4805—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding characterised by the type of adhesives
    • B29C65/483—Reactive adhesives, e.g. chemically curing adhesives

Definitions

  • the invention relates to a plug to be fixed to a tube by a glue joint, which plug is e.g. a metal or plastic plug.
  • Tubular profiles are relatively strong structural components relative to their 10 weight. However, the lightness/strength properties of the profiles may be utilized in structures only, if the profiles may be fixed to each other or to other structures by means of a structural part, which sufficiently well supports and transmits the load.
  • Extendable thermoplastic plastics especially long-fiber reinforced plastics, are often sufficiently strong for various joining cases.
  • the extrusion pieces are very economical as large series and they may possess very different forms.
  • the lightness and the resistance to corrosion are similar to those of reinforced plastic.
  • thermoplasts are generally very poorly glueable.
  • the gluing of the joining parts traditionally occurs by applying glue on the surfaces to be joined, whereafter the pieces to be glued are inserted inside one and another.
  • Such a gluing method provides a very indefinite glue seam, which
  • glue is located only in one place, i.e. at the ring groove, and thereby in a very narrow area. Furthermore, the glue layer is relatively thick. For this reason, the loosening of the gluing from the smooth inner surface of the inner tube is very likely, and the glue joint cannot be applied to transmitting large loads.
  • the plug according to the publication is formed by its cross- section as a narrowing or tapered plug, and the end portions of the plug are provided with flange portions penetrating into the inner surface of the tube.
  • a ring space taperedly expanding towards the inner portion of the tube defined by the inner surface of the tube and the outer surface of the plug.
  • holes are bored through the tube for the inlet of the glue and for the outlet of the air.
  • the present invention relates to a plug to be fixed to a tube by means of a glue joint, which plug may be glued reliably and strongly to the tube to its inside such that the glue securely covers the entire gluing area, and at the same time, the amount of the glue to be used is as low as possible.
  • the invention also relates to a plug to be fixed to the tube by means of a glue joint, and the gluing of which plug may be performed, as the plug is in its position inside the tube, and in addition the gluing may be readily automated.
  • the inventive plug to be fixed to a tube by means of a glue joint which, when the plug is glued, the glue is fed when the plug is in position in the tube, is characterized in that the plug surface to be glued or the inner surface of the tube is provided with a compensation groove located essentially in the middle range of the joint, into which the glue is injected by means of at least one injection hole preferably centrally and symmetrically, whereby the glue is fitted to advance from said compensation groove as two uniform fronts preferably jsymmetrically towards the ends of the plug.
  • the surfaces on both sides of the compensation groove are tapered surfaces.
  • the inventive plug is preferably provided with a thread element or an insert, whereby the plug may be used for joining the tube portions into each other by means of the thread joint.
  • the inventive plug is especially well adaptable to be fixed to reinforced-plastic tubes by means of a suitable glue, e.g. by an epoxy glue.
  • a suitable glue e.g. by an epoxy glue.
  • any glue may naturally be used, which may be injected and which has a sufficient adher ⁇ ence.
  • the surface of the reinforced plastic may be roughened-up by means of a suitable tool.
  • the plug may be manufactured of several different materials. A suitable material is e.g. aluminium. However, it is to be noted that the inventive plug may, for its form without decreasing the strength, also be made of such a material, into which the adherence of the glue utilized is essen- tially poorer than that of the tube material.
  • Fig. 1 shows an inventive plug placed inside a tube as a partial cross-section
  • Fig. 2 shows an inventive plug as a partial cross-section
  • Fig. 1 a tube 10, inside which is fitted an inventive plug shown in Fig. 1 and 2.
  • the longitudinal axis of the tube 10 is referred to in Fig. 1 by a reference A and the longitudinal axis of a plug 11 in Fig. 2 by a reference B.
  • the plug 11 is meant to be an end insert of the tube 10.
  • the task of the end insert 11 is to possibilitate the mechanical joining of the tube 19, such as a reinforced-plastic tube, in the mounting step.
  • the end insert 11 is intended especially to boom tubes 10 of derrick masts and into the mast/foundation and mast/mast connections.
  • the end insert 11 may well be applied to all pipe joints.
  • the joint has to be strong, the adherence has to be good and it has possibly to perform the gluing with its pretreatments in a controlled manner at a factory.
  • the gluing method has to be secure and very repeatable.
  • the joint has to resist demanding environmental conditions.
  • the end insert 11 is glued by injecting the glue through the insert 11 into a space between a wall of the tube 10 and the insert 11.
  • the injection occurs via an injection hose 13.
  • the hose 13 is bent and closed e.g by means of clamper. After the glue has set, the injection hose 13 is removed.
  • the glue is injected centrally and symmetrically via the injection hole 12 into one cross-section, i.e. into a compensation groove 14, which is first filled.
  • the compensation groove 13 is located essentially in the central area of the surface of the insert 11 to be glued. From the compensation groove 14, the glue starts to advance as two uniform fronts symmetrically towards both ends 11a and lib of the insert 11.
  • the task of conical surfaces 15 on both sides of the compensation groove 14 is to control the advancement of glue during the injection.
  • the glue seam is thicker such that the glue strip easily starts to advance from the compensation groove 14. However, the seam must not be too thick, since it would decrease the strength of the joint.
  • the conical angle ⁇ of the conical surfaces 15 is as small as possible.
  • the preferable extent of the conical angle ⁇ is ca. 1.25°.
  • the ends 11a and lib of the insert 11 are formed for minimizing stress peaks. Especially the inner end 11a of the insert 11 forms an essentially steeper conical surface 16 relative to conical surfaces 15. The conical surface 16 of the inner end 11a of the insert 11 is formed similarly such that the glue seam is filled as completely as possible and the air bubbles come out thereof. At the inlet end 11a of the insert 11 is located a special sealing 17, which closes the glue space and centralizes the inner end 11a of the insert 11. The grooving special sealing 17 in the insert 11 is referred to by a reference 27.
  • the centralization of the insert 11 occurs by means of a step 18 machined into the insert 11.
  • the sealing occurs by means of an external tape 19 and an insert base 21/tube 10 seam.
  • air is flown away from small holes 20 made in the tube, which holes are located on both ends of the insert 11.
  • the air flowing holes 20 are closed e.g. by means of a tape 19.
  • the glue flowing from the air flowing holes 20 indicates the filling of the glue space.
  • a thin cloth 25 remaining after the setting of the glue is also bored open.
  • the insert 11 is made of aluminium.
  • the aluminium is mechanically and chemically surface treated and the inner surface of the tube 10 is roughened-up.
  • the glue has to be of the correct type.
  • Due to a thread 26 in the insert 11, the tube 10 may be mechanically connected to any source.
  • the insertion joint may be used in tubes 10 of all dimensions. However, all dimen ⁇ sions of the tube 10 do not change in the same relation as the diameter of the tube 10.

Abstract

The invention relates to a plug (11) to be fixed to a tube (10) by means of a glue joint, which, when the plug is glued, the glue is fed when the plug (11) is in position in the tube (10). The surface of the plug (11) to be glued or the inner surface of the tube is provided with a compensation groove (14) located essentially in the middle range of the joint, into which the glue is injected by means of at least one injection hole (12), preferably centrally and symmetrically. The glue is fitted to advance from said compensation groove (14) as two uniform fronts preferably symmetrically towards ends (11a, 11b) of the plug (11).

Description

A plug to be fixed to a tube by a glue joint
5
The invention relates to a plug to be fixed to a tube by a glue joint, which plug is e.g. a metal or plastic plug.
Tubular profiles are relatively strong structural components relative to their 10 weight. However, the lightness/strength properties of the profiles may be utilized in structures only, if the profiles may be fixed to each other or to other structures by means of a structural part, which sufficiently well supports and transmits the load.
15 Metallic joining parts are usually sufficiently strong, but they are yet expensive, heavy and sensitive to corrosion. Metals are relatively well glueable, but the gluing generally requires a special treatment for the surfaces. Reinforced-plastic joining parts are strong, but they are expensive and often individual by their properties. Reinforced-plastics are very glueable after roughing-up the surface.
20
Extendable thermoplastic plastics, especially long-fiber reinforced plastics, are often sufficiently strong for various joining cases. The extrusion pieces are very economical as large series and they may possess very different forms. The lightness and the resistance to corrosion are similar to those of reinforced plastic.
25 The thermoplasts are generally very poorly glueable.
The gluing of the joining parts traditionally occurs by applying glue on the surfaces to be joined, whereafter the pieces to be glued are inserted inside one and another. Such a gluing method provides a very indefinite glue seam, which
C* 30 also varies by its quality, since the glue tends to "uncomb" away from the glue play. The work cannot clearly be defined and it is mechanically difficult to be mechanized. On the basis of the US patent 4.211.259, it is known to prepare the glue joint between two tubes inserted inside one and another. According to the patent, on the inner surface of the uppermost tube is formed one groove extending around the inner periphery of the tube. Furthermore, there are in the outer tube at said groove and on the opposite sides of the tube holes for the inlet of glue and for the outlet of air. The gluing is performed when the tubes are in position and inside one and another by pressing glue from one hole towards the inside, whereby is spreads along a ring groove formed on the inner surface of the outer tube. Air exits from a hole on the opposite side and the filling of the ring groove may be observed as the glue exits from the air outlet hole.
In the gluing system according to the patent, glue is located only in one place, i.e. at the ring groove, and thereby in a very narrow area. Furthermore, the glue layer is relatively thick. For this reason, the loosening of the gluing from the smooth inner surface of the inner tube is very likely, and the glue joint cannot be applied to transmitting large loads.
In the EP publication 318.818 is described a method for gluing the plug on the end of the tube. The plug according to the publication is formed by its cross- section as a narrowing or tapered plug, and the end portions of the plug are provided with flange portions penetrating into the inner surface of the tube. Thus, between said flange portions is formed a ring space taperedly expanding towards the inner portion of the tube defined by the inner surface of the tube and the outer surface of the plug. Furthermore, holes are bored through the tube for the inlet of the glue and for the outlet of the air.
In accordance with the structure of the publication, attempts are made to achieve the fact that the flowing resistance of the glue reduces in said ring space towards the inner portion of the tube, and by means thereof attempts are also made to ensure the fact that the glue advances uniformly also to the inner end of the plug. The gluing method according to the publication has the same advantages as the gluing according to the above-mentioned US patent publication. Further- more, it is very likely that in the gluing according to the EP publication air pockets remain in the space between the tube and the plug, at which pockets there is no glue.
The present invention relates to a plug to be fixed to a tube by means of a glue joint, which plug may be glued reliably and strongly to the tube to its inside such that the glue securely covers the entire gluing area, and at the same time, the amount of the glue to be used is as low as possible. The invention also relates to a plug to be fixed to the tube by means of a glue joint, and the gluing of which plug may be performed, as the plug is in its position inside the tube, and in addition the gluing may be readily automated.
The inventive plug to be fixed to a tube by means of a glue joint, which, when the plug is glued, the glue is fed when the plug is in position in the tube, is characterized in that the plug surface to be glued or the inner surface of the tube is provided with a compensation groove located essentially in the middle range of the joint, into which the glue is injected by means of at least one injection hole preferably centrally and symmetrically, whereby the glue is fitted to advance from said compensation groove as two uniform fronts preferably jsymmetrically towards the ends of the plug.
In a certain preferred embodiment of the invention, the surfaces on both sides of the compensation groove are tapered surfaces.
The inventive plug is preferably provided with a thread element or an insert, whereby the plug may be used for joining the tube portions into each other by means of the thread joint.
The inventive plug is especially well adaptable to be fixed to reinforced-plastic tubes by means of a suitable glue, e.g. by an epoxy glue. In the gluing, any glue may naturally be used, which may be injected and which has a sufficient adher¬ ence. For the gluing, the surface of the reinforced plastic may be roughened-up by means of a suitable tool. The plug may be manufactured of several different materials. A suitable material is e.g. aluminium. However, it is to be noted that the inventive plug may, for its form without decreasing the strength, also be made of such a material, into which the adherence of the glue utilized is essen- tially poorer than that of the tube material.
The invention is next described in more detail with reference to the accompany¬ ing figures, in which
Fig. 1 shows an inventive plug placed inside a tube as a partial cross-section;
Fig. 2 shows an inventive plug as a partial cross-section;
In Fig. 1 is shown a tube 10, inside which is fitted an inventive plug shown in Fig. 1 and 2. The longitudinal axis of the tube 10 is referred to in Fig. 1 by a reference A and the longitudinal axis of a plug 11 in Fig. 2 by a reference B. In this embodiment, the plug 11 is meant to be an end insert of the tube 10. The task of the end insert 11 is to possibilitate the mechanical joining of the tube 19, such as a reinforced-plastic tube, in the mounting step. Then, the end insert 11 is intended especially to boom tubes 10 of derrick masts and into the mast/foundation and mast/mast connections. However, the end insert 11 may well be applied to all pipe joints. The joint has to be strong, the adherence has to be good and it has possibly to perform the gluing with its pretreatments in a controlled manner at a factory. The gluing method has to be secure and very repeatable. The joint has to resist demanding environmental conditions.
The end insert 11 is glued by injecting the glue through the insert 11 into a space between a wall of the tube 10 and the insert 11. An injection hole 12, i.e. one or more through-going holes, is formed into the insert 11. The injection occurs via an injection hose 13. For ensuring the correct positioning of the injection hose 13, there is about an 0.1 mm extension 23 in the mounting hole. After the completion of the injection, the hose 13 is bent and closed e.g by means of clamper. After the glue has set, the injection hose 13 is removed.
The glue is injected centrally and symmetrically via the injection hole 12 into one cross-section, i.e. into a compensation groove 14, which is first filled. The compensation groove 13 is located essentially in the central area of the surface of the insert 11 to be glued. From the compensation groove 14, the glue starts to advance as two uniform fronts symmetrically towards both ends 11a and lib of the insert 11. The task of conical surfaces 15 on both sides of the compensation groove 14 is to control the advancement of glue during the injection. In the vicinity of the compensation groove 14, the glue seam is thicker such that the glue strip easily starts to advance from the compensation groove 14. However, the seam must not be too thick, since it would decrease the strength of the joint. The seam becomes thinner when advancing towards the ends 11a and lib, since it is important from the point of view of the strength of the joint (an optimally thin seam in critical parts). Because of this, the conical angle α of the conical surfaces 15 is as small as possible. The preferable extent of the conical angle α is ca. 1.25°.
The ends 11a and lib of the insert 11 are formed for minimizing stress peaks. Especially the inner end 11a of the insert 11 forms an essentially steeper conical surface 16 relative to conical surfaces 15. The conical surface 16 of the inner end 11a of the insert 11 is formed similarly such that the glue seam is filled as completely as possible and the air bubbles come out thereof. At the inlet end 11a of the insert 11 is located a special sealing 17, which closes the glue space and centralizes the inner end 11a of the insert 11. The grooving special sealing 17 in the insert 11 is referred to by a reference 27.
At the outer end lib of the insert 11, the centralization of the insert 11 occurs by means of a step 18 machined into the insert 11. The sealing occurs by means of an external tape 19 and an insert base 21/tube 10 seam. Between the step 18 and the base 21 there is a groove 22, whose task is to ensure the filling of the outer end of the glue joint. In connection with the injection, air is flown away from small holes 20 made in the tube, which holes are located on both ends of the insert 11. After the injection, the air flowing holes 20 are closed e.g. by means of a tape 19. The glue flowing from the air flowing holes 20 indicates the filling of the glue space. Along with the extra glue to be injected it is also possible to press away the air bubbles from the seam.
For a water hole 24, a thin cloth 25 remaining after the setting of the glue is also bored open. Thus, it may be possible to flow the water away collecting in e.g. a mast tube 10 through the joint (requiring a hollow bolt).
The insert 11 is made of aluminium. For obtaining a good adherence, the aluminium is mechanically and chemically surface treated and the inner surface of the tube 10 is roughened-up. From the point of view of a suitable operation of the joint, the glue has to be of the correct type. Due to a thread 26 in the insert 11, the tube 10 may be mechanically connected to any source. The insertion joint may be used in tubes 10 of all dimensions. However, all dimen¬ sions of the tube 10 do not change in the same relation as the diameter of the tube 10.

Claims

Claims
1. A plug (11) to be fixed to a tube (10) by means of a glue joint, which, when the plug is glued, the glue is fed when the plug (11) is in position in the tube (10), characterized in that the surface of the plug (11) to be glued or the inner surface of the tube (10) is provided with a compensation groove (14) located essentially in the middle range of the joint, into which the glue is injected by means of at least one injection hole (12), preferably centrally and symmetrically, whereby the glue is fitted to advance from said compensation groove (14) as two uniform fronts preferably symmetrically towards ends (11a, lib) of the plug (11).
2. A plug according to Claim 1, characterized in that the surfaces on both sides of the compensation groove (14) of the plug (11) are conical surfaces (15).
3. A plug according to Claim 2, characterized in that the conical angle (α ) of the conical surfaces (15) is small, preferably ca. 1.25°.
4. A plug according to any of the preceding Claims 1-3, characterized in that the inner end (11a) of the plug (11) is a conical surface (16), whose conicity is essentially larger than the conicity of the conical surfaces (15) on both sides of said compensation groove (14).
5. A plug according to any of the preceding Claims 1-4, characterized in that there is a sealing (17) at the inner end (11a) of the plug (11), which sealing (17) closes the glue space and centralizes the inner end (11a) of the plug (11).
6. A plug according to any of the preceding Claims 1-5, characterized in that the outer end (lib) of the plug (11) is provided with a step (18), which centralizes the outer end (lib) of the plug (11).
7. A plug according to Claim 6, characterized in that there is a groove (22) between said step (18) and the foundation (21) of the plug (11), which ensures the filling of the outer end of the glue joint.
8. A plug according to any of the preceding Claims 1-7, characterized in that there are air flowing holes (20) at both ends of the plug (11).
9. A plug according to Claim 8, characterized in that after the injection said air flowing holes (20) are closed by means of a tape (19) or in another suitable manner.
10. A plug according to any of the preceding Claims 1-9, characterized in that the plug (11) is provided with a thread element (26) for fixing the joint or some other element to the plug (11).
11. A plug according to any of the preceding Claims 1-10, characterized in that the plug (11) is provided with an injection hole (12), which is a through-going hole of the plug (11), which hole is in contact with said compensation groove (14).
12. A plug according to any of the preceding Claims 1-3, characterized in that the sealing of the seam between the base (21) of the plug (11) and the tube (11) is achieved by means of an external tape (19) or in another suitable manner.
13. A plug according to any of the preceding Claims 1-12, characterized in that there is a water hole (24) in the plug (11), for which a thin extension (25) in the plug (11) hardened by the glue is bored open.
14. A plug according to any of the preceding Claims 1-13, characterized in that the plug (11) is preferably made of aluminium.
PCT/FI1993/000082 1992-03-11 1993-03-09 A plug to be fixed to a tube by a glue joint WO1993018311A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI921064 1992-03-11
FI921064A FI89406C (en) 1992-03-11 1992-03-11 Plug attached to a pipe by means of a glue joint

Publications (1)

Publication Number Publication Date
WO1993018311A1 true WO1993018311A1 (en) 1993-09-16

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PCT/FI1993/000082 WO1993018311A1 (en) 1992-03-11 1993-03-09 A plug to be fixed to a tube by a glue joint

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Country Link
FI (1) FI89406C (en)
WO (1) WO1993018311A1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994028324A1 (en) * 1993-06-01 1994-12-08 Ab Volvo A device for centering a rotational unit
EP0711650A1 (en) * 1994-11-11 1996-05-15 Rotalac Plastics Limited Solvent bonding
EP0825379A1 (en) * 1996-08-22 1998-02-25 HAGUS C. LUCHTENBERG GmbH & Co. KG Plug for the clamping insertion into a pipe end
WO2016034406A1 (en) * 2014-09-04 2016-03-10 Bayerische Motoren Werke Aktiengesellschaft Adhesive-distributing device and method for adhesively bonding hollow profiles using an adhesive-distributing device
EP3724525A4 (en) * 2017-12-14 2021-08-25 Divergent Technologies, Inc. Apparatus and methods for connecting nodes to tubes in transport structures

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US4044512A (en) * 1974-11-14 1977-08-30 Artur Fischer Method and arrangement for anchoring an object to a support structure
DE2315859C2 (en) * 1973-03-30 1985-03-07 International Intec Co. Ets., Vaduz Anchor bolts
US5052848A (en) * 1987-12-28 1991-10-01 Sakae Ringyo Co., Ltd. Tube fixing structure of a bicycle
US5087147A (en) * 1987-12-03 1992-02-11 Gkn Automotive Ag Assembly of shaft and hub member

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Publication number Priority date Publication date Assignee Title
DE2315859C2 (en) * 1973-03-30 1985-03-07 International Intec Co. Ets., Vaduz Anchor bolts
US4044512A (en) * 1974-11-14 1977-08-30 Artur Fischer Method and arrangement for anchoring an object to a support structure
US5087147A (en) * 1987-12-03 1992-02-11 Gkn Automotive Ag Assembly of shaft and hub member
US5052848A (en) * 1987-12-28 1991-10-01 Sakae Ringyo Co., Ltd. Tube fixing structure of a bicycle

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DERWENT'S ABSTRACT, No. 90-229988/30, week 9030; & SU,A,1 534 224, (FURNITURE IND RES), 7 January 1990. *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994028324A1 (en) * 1993-06-01 1994-12-08 Ab Volvo A device for centering a rotational unit
US5855444A (en) * 1993-06-01 1999-01-05 Ab Volvo Device for centering a rotational unit
EP0711650A1 (en) * 1994-11-11 1996-05-15 Rotalac Plastics Limited Solvent bonding
EP0825379A1 (en) * 1996-08-22 1998-02-25 HAGUS C. LUCHTENBERG GmbH & Co. KG Plug for the clamping insertion into a pipe end
WO2016034406A1 (en) * 2014-09-04 2016-03-10 Bayerische Motoren Werke Aktiengesellschaft Adhesive-distributing device and method for adhesively bonding hollow profiles using an adhesive-distributing device
US10315369B2 (en) 2014-09-04 2019-06-11 Bayerische Motoren Werke Aktiengesellschaft Adhesive-distributing device and method for adhesively bonding hollow profiles using the adhesive-distributing device
EP3724525A4 (en) * 2017-12-14 2021-08-25 Divergent Technologies, Inc. Apparatus and methods for connecting nodes to tubes in transport structures

Also Published As

Publication number Publication date
FI89406C (en) 1993-09-27
FI921064A0 (en) 1992-03-11
FI89406B (en) 1993-06-15

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