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
  • B29C59/00—Surface shaping of articles, e.g. embossing; Apparatus therefor
  • B29C59/02—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing
  • B29C59/04—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing using rollers or endless belts
  • B29C59/043—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing using rollers or endless belts for profiled articles
• • 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
  • F16B13/00—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose
  • F16B13/02—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose in one piece with protrusions or ridges on the shaft
• • 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
  • F16B13/00—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose
  • F16B13/04—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose with parts gripping in the hole or behind the reverse side of the wall after inserting from the front
  • F16B13/06—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose with parts gripping in the hole or behind the reverse side of the wall after inserting from the front combined with expanding sleeve
  • F16B13/061—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose with parts gripping in the hole or behind the reverse side of the wall after inserting from the front combined with expanding sleeve of the buckling type
• • 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
  • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
  • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
  • B29C48/12—Articles with an irregular circumference when viewed in cross-section, e.g. window profiles
• • 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
  • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
  • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
  • B29C48/13—Articles with a cross-section varying in the longitudinal direction, e.g. corrugated pipes
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
  • B29L2023/00—Tubular articles
  • B29L2023/003—Tubular articles having irregular or rough surfaces

Definitions

• the present invention relates to a tubular screw anchoring member of the extruded type having a substantial uniform cross-section along its total length and adapted to be inserted in a bored hole and compris ⁇ ing a number of longitudinally extending , peripherally spaced, flexible ribs or fins projecting radially outwardly from the outer peripheral surface of said tubular member.
• a screw anchoring member of the type described above may, for example, be mounted in a hole which has been bored or drilled in a solid brick wall , or in a throughgo ⁇ ng hole which has been made in a . panel , such as a plasterboard .
• a screw for example a wood screw
• the anchoring member will expand within the hole, not only because the material of the anchoring member is displaced radially outwardly by the screw, but also because the anchoring member is compressed axially and also twisted to some extent when the screw is tightened .
• the present invention provides a tubular screw anchoring member of the extruded type described above which may be provided with outer ribs or fins of relatively large radial dimensions, and which may nevertheless be satisfactorily anchored in a blind or throughgoing hole even when a relatively small torque Is. applied to the screw during tightening thereof.
• this Is obtained thereby that each of said ribs or fins are Interrupted or weakened at axial Intervals.
• the weakenings or interruptions may even reduce the torsional resistance to such an extent that It becomes smaller than the torsional resistance of a corresponding screw anchoring member without any fins or ribs. This reduction is believed to result from the fact that said weakenings or Interruptions of the fins may also cause a notch effect In the under ⁇ lying material . Furthermore, these interruptions or weakenings impart a certain roughness to the fins or ribs, whereby their friction In ⁇ creasing ability is substantially Improved. Consequently, the screw anchoring member according to the invention may not inadvertently be pushed too far into a hole made In a wall or panel, even if the dia ⁇ meter of the hole exceeds the prescribed diameter.
• the screw anchoring member according to the invention may be of the type disclosed in Danish patent No. 125488 and French patent No. 7019457 comprising peripherally spaced, longitudinally extending rod-like, edged parts which are interconnected by thin, flexible wall parts.
• the flexible wall parts interconnect the radially outer portions of adjacent rod-like parts . In that case, the flexible wall parts substantially increase the torsional resistance of the anchoring member.
• the flexible wall parts of the screw anchoring member preferably interconnect radially inner portions of the adjacent rod-like parts, and the said fins or ribs may then be positioned at the radially outer surfaces of the rod- 1 ike parts and preferably at the radially outer edges of the rod-like parts.
• the arrangement of the flexible wall parts closer to the axis of the tubular screw anchoring member not only reduces torsional resistance of the anchoring member, but also exposes the outer edges of the rod-like parts, whereby these edges 'may engage with the Inner wall of the bore and thereby further Increase friction between the screw anchoring member and the bore wall .
• the said fins or ribs may comprise pairs of mutually spaced, substan ⁇ tially parallel or outwardly diverging fins arranged on respective ones of said rod-like parts . This secures that the ribs in each such pair will be bended in opposite peripheral directions when the screw anchoring member is pushed into a bore. Thus, the fins will prevent rotation of the anchoring member in the bore in either direction .
• the spacings between the interruptions or weakenings of each of the ribs or fins should be relatively short, for example in the order of one or a few millimeters .
• the screw anchoring member according to the invention may be made from any type of deformable material, such as rubber, fiber material , and soft metal .
• the anchoring member according to the invention is normally made from plastic material , preferably thermoplastic material such as polyvinylchloride.
• This material has a good heat conducting ability so that the heat generated by friction between the screw and the inner wall surface of the anchoring member also causes heating and softening of the radial ⁇ ly outer surface parts of the anchoring member * being in contact with the Inner surface of the bore In which the anchoring member is mounted. Such softening of the outer surface parts of the anchoring member allows for optimum engagement between the anchoring member and the bore surface.
• the present Invention also provides a method of making tubular screw anchoring members according to the invention, said method comprising extruding a tubular string with the desired cross-section and having a number of preferably flexible, longitudinally extending, peripherally spaced ribs or fins projecting radially outwardly from the surface of said string, and cutting said string into predetermined lengths, and the method according to the invention is characterized in that said fins or .ribs are transversely cut at axial intervals or pro ⁇ vided with axially spaced indentations or notches. Such cutting or notching may be made at any stage of the " production prior to or after cutting of the string into lengths by any suitable means, such as cutting tools.
• the said string Is moved past an arrangement of rollers each having tooth-like projections at their peripheral surface, and the fins or ribs on said string are engaged with the projections on said rollers while rotating the same so as to provide said Indenta ⁇ tions or notches prior to cutting said string into predetermined lengths.
• Such method where the cutting or notching of the fins or ribs is carried out in connection with the extrusion process allows a rational and economical production .
• Fig. 1 Is a perspective view of an embodiment of a tubular screw anchoring member according to the invention
• Figs. 2 and 3 are end views of the anchoring member shown in Fig . 1 mounted in holes bored or drilled with two different diameters, in a solid wall of concrete or brick material ,
• Fig. 4 is an end view corresponding to that shown in Fig. 3, but when a screw has been screwed into the anchoring member, Fig. 5 shows an end view of the presently preferred cross-sectional shape of the screw anchoring member,
• Figs. 6 and 7 are side views and partially sectional views showing the anchoring members of Figs. 2 and 3, respectively, after tighten ⁇ ing of the screw,
• Figs. 8 - 10 are side views and partially sectional views showing the screw anchoring member of Fig. 1 mounted in a throughgo ⁇ ng hole in a panel or board on three different stages of tightening of the screw which has been screwed into the anchoring member
• Figs. 11 and 12 are side views and partially sectional views showing the anchoring member of Fig . 1 mounted in a blind hole bored or drilled in a solid wall of gas concrete or a similar brittle, material, and with a screw in a non-tightened and fully tightened condition, respec ⁇ tively,
• Fig. 13 shows the screw anchoring member mounted In a throughgoing hole in a hollow brick and with the screw in a tightened condition
• Fig. 14 illustrates d ⁇ agrammat ⁇ cally and in a smaller scale an appara ⁇ tus or a plant for producing screw anchoring members according to the invention
• Fig. 15 is an end view and partially sectional view in an enlarged scale d ⁇ agrammatically illustrating a roller arrangement for forming spaced Interruptions or indentations in the outer fins or ribs of the screw anchoring member.
• Fig . 1 illustrates a tubular screw anchoring member 10 comprising a number (in the present case three) of longitudinally extending , peripherally spaced, solid elongated blocks or rod-like parts 11 each having a cross-section shaped substantially as a sector of a circular ring.
• the rod-like parts 11 are Interconnected at their radially inner edges by thin , flexible wall parts 12 each having an angular cross- sectional shape so that the inner surfaces of the rod-like parts 11 and the flexible wali parts 12 together define an axial passage or bore 13 extending through the screw anchoring member 10 and having a cross-sectional shape which is substantially in the form of an equila ⁇ teral triangle, when the screw anchoring member is in its non-stres ⁇ sed condition .
• the screw anchoring member 10 also comprises a number of longitu ⁇ dinally extending , radial fins or ribs 14 formed at the outer surfaces of the rod-like parts 11.
• a fin or rib 14 Is formed at each of the outer edges of the rod-like parts 11.
• the pair of ribs arranged on each of the rod-like * ' parts, are preferably substantially mutually parallel .
• Each of the fins or ribs is interrupted by axially closely spaced indentations or notches 15. If the cross section of the bottom of these indentations or notches is pointed or sharp, the depth of the notches Is of less Importance due to the so-called notch effect.
• the indentations preferably extend over the total radial height of the fins or ribs.
• the presently preferred cross -sectional shape of the anchoring member in its non- stressed condition appears from Fig . 5 showing an end view of the- screw anchoring member 10.
• the screw anchoring member 10 shown in Fig . 1 may be used for mounting a screw in a hole drilled or bored In a wall or panel , and the same anchoring member may without problems be used In any hole having a diameter within a relatively wide range of diameters, corre ⁇ sponding substantially to the radial extension of the fins or ribs 14.
• Fig . 2 illustrates a situation where the screw anchoring member 10 shown in Fig . 1 has been pushed into a hole drilled in a wall or panel 16 with a diameter at the lower end of the range of diameters for which the screw anchoring member may be used . When the anchoring member 10 is pushed into such an undersized hole, the fins or ribs
• the anchoring member 10 is mounted In a bored hole having a relatively small dia ⁇ meter, the radial expansion of the anchoring member caused by Inser ⁇ tion of the screw 18 will be sufficient to bring the anchoring member in tight engagement with the wall of the bored hole . and thereby to anchor the fastening member in the hole.
• the hole is a blind hole bored In a wail of a hard material, such as concrete or brick, the anchoring member will not be twisted or compressed axially to any substantial extent by tightening of the screw 18 as illustrated in Fig . 6. If, however, the bored hole Is oversized, as shown in Fig.
• the anchoring member 10 will be twisted and compressed axially to such an extent that the radial expansion necessary for causing a secure anchoring is obtained .
• the fact that the anchoring member 10 is provided with just three rod-like parts 11 causes a self-centering of the anchoring member in the hole when the screw is tightened .
• Fig . 8 shows the screw anchoring member 10 mounted in a through- going hole drilled in a panel 19, such as plasterboard .
• the roughness of the fins 14 provided by the indentations or notches 15 and the resilient engagement between the fins 14 and the inner wall of the hole give rise to substantial frictional forces between the screw an ⁇ choring member 10 and the Inner wall of the hole, even when the diameter of the hole Is relatively big . This fact eliminates the risk that the screw anchoring member 10 is inadvertently pushed totally through the hole and becomes lost.
• FIG. 9 shows an Intermediary stage of tightening of the screw, and it Is clearly illustrated, how the indentations or notches 15 may be widened and narrowed in order to facilitate twisting of the anchoring member.
• the indentations or notches impart a sort of chain effect to the fins 14 and to the rod-like parts 11 -
• Figs . 11 and 12 show a similar situation , where a screw anchoring member 10 has been mounted in a blind bore 24 In a wall 25 of gas concrete or a s ⁇ mifar brittle material -
• Fig. 11 shows a situation where the screw 18 has just been inserted into the screw anchoring member 10 mounted in the bore 24, and
• Fig . 12 shows the situation after- tightening of the screw 18.
• the anchoring member Is expanded to such an extent that It displaces some of the wail material surrounding the bored hole, whereby the anchoring is improved.
• Fig . 13 shows the anchoring member 10 mounted in a hole bored in a hollow brick 38 or in another hollow building element. In this case the anchoring member functions In substantially the same manner as that shown and described in connection with Figs. 8 - 10.
• Screw anchoring members 10 of the type shown in Fig . 1 may be produced very rationally by extrusion.
• Figs. 14 and 15 illustrate an apparatus or system for producing such anchoring members.
• the apparatus shown in Fig . 14 comprises an extruder die 26 extruding a tubular string 27 having a cross-section corresponding to that of the anchoring member shown In Fig . 1.
• the extruded string 27 is passed along a supporting member 28 and is kept In contact with a guide surface thereon by means of a spring actuated roller arrangement 29.
• a notching roller arrangement 30 comprising a frame 31 rotatably mounting a pair of smaller notching rollers 32 having tooth-like projections 33 formed on their peripheral surfaces and a similar greater notching roller 34 which is driven by means of a driving motor 35 with a peripheral speed corresponding substantially to the extrusion rate of the string 27.
• the notching rollers 32 and 34 are arranged so that their projections or teeth 33 engage with and form closely spaced notches in the fins or ribs 14 of the string 27. While the notching roller 34 is driven by the motor 35, the notching rollers 32 are driven by the moving string 27. As best shown in Fig .
• adjacent fins 14 on adjacent rod-like parts extend substantially paral ⁇ lel outwardly so that each such pair of fins may be notched by a single roller.
• the string 27 having passed the roller arrangement 30 may proceed to a cutting device 36 for cutting the string 27 into desired lengths forming screw anchoring members 10. These screw anchoring members may be collected in a storage container 37.
• the screw anchoring member 10 is preferably made from plastic mate ⁇ rial of the type normally used for screw anchoring members, such as polyvinylchloride. It should be understood that within the scope of the present invention the screw anchoring member 10 may have any suitable cross-section other than that shown in the drawings and provided with outer notched fins or ribs. As an example, a cross-

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Dowels (AREA)
• Fishing Rods (AREA)
• Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)
• Pens And Brushes (AREA)

Applications Claiming Priority (4)

Publications (1)

Family

ID=26066406

Family Applications (1)

Country Status (9)

Families Citing this family (6)

Family Cites Families (6)

• 1981
  • 1981-08-18 DK DK366481A patent/DK366481A/da not_active Application Discontinuation
  • 1981-10-13 FR FR8119245A patent/FR2505946A1/fr not_active Withdrawn
• 1982
  • 1982-05-07 AU AU83509/82A patent/AU8350982A/en not_active Abandoned
  • 1982-05-18 PT PT74915A patent/PT74915B/pt unknown
  • 1982-05-18 IT IT67653/82A patent/IT1196664B/it active
  • 1982-05-18 ES ES1982275053U patent/ES275053Y/es not_active Expired
  • 1982-05-18 EP EP82901586A patent/EP0079360A1/en not_active Withdrawn
  • 1982-05-18 WO PCT/DK1982/000043 patent/WO1982004106A1/en not_active Application Discontinuation
• 1983
  • 1983-01-14 NO NO830107A patent/NO830107L/no unknown

Non-Patent Citations (1)

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