Classifications

• • 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
  • F16B5/00—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them
  • F16B5/02—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them by means of fastening members using screw-thread
• • 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
  • F16B25/00—Screws that cut thread in the body into which they are screwed, e.g. wood screws
  • F16B25/001—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by the material of the body into which the screw is screwed
  • F16B25/0031—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by the material of the body into which the screw is screwed the screw being designed to be screwed into different materials, e.g. a layered structure or through metallic and wooden parts
• • 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
  • F16B25/00—Screws that cut thread in the body into which they are screwed, e.g. wood screws
  • F16B25/0036—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw
  • F16B25/0042—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw characterised by the geometry of the thread, the thread being a ridge wrapped around the shaft of the screw
  • F16B25/0047—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw characterised by the geometry of the thread, the thread being a ridge wrapped around the shaft of the screw the ridge being characterised by its cross-section in the plane of the shaft axis
• • 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
  • F16B37/00—Nuts or like thread-engaging members
  • F16B37/12—Nuts or like thread-engaging members with thread-engaging surfaces formed by inserted coil-springs, discs, or the like; Independent pieces of wound wire used as nuts; Threaded inserts for holes
  • F16B37/122—Threaded inserts, e.g. "rampa bolts"
  • F16B37/125—Threaded inserts, e.g. "rampa bolts" the external surface of the insert being threaded

Definitions

• This invention relates to ttibe screws and methods of penetrating materials, e.g. wooden or metal components or components of softer materials e.g. plaster boards, using such tube screws e.g. to form an anchor for a hook or for connecting tvo or more components, and particularly relates to penetrating such materials without the necessity of first forming a hole in such materials for the reception of the tube screws.
• penetrating materials e.g. wooden or metal components or components of softer materials e.g. plaster boards
• British Patent specification 541 345 filed by George Ernest Osniond on May 21st 1941 describes a method of joining using a screw or hollow connector of tubular form.
• the jointing member when in place can be used as a conduit for electric leads, or as a bush i.e. by the provision of an appropriate internal thread.
• the tubular member is used in conjunction with an operating tool whereby the screw is driven into the solid substance to be joined.
• Such a tubular member may be grooved to permit a simple spindle operating tool to be used for driving the member into plain or screw-threaded holes into the materials to be joined, or the operating member may itself be threaded on its internal surface for the reception of a corresponding threaded portion of the spindle operating tool.
• Such a tubular joining member may be made by corrugating thin sheet metal tubes, the resulting cavity wall accommodating a threaded driving tool or for use as a bush.
• Such a device is primarily intended for driving into end-grained wood, and when joining other objects to such wood, the securing of such other objects to the wood is achieved by the splayed configuration of the trailing end.
• the device To engage the helically-extending grooves the device must first be dsiven e.g. by hammer blows, into the wood.
• any helically-extending grooves which may be provided on the body of the tube do not provide a sharp cutting edge so that the fastening member may only be screwed into the wood with difficulty.
• the present invention is directed to a tube screw which in use may readily be inserted into materials without the provision of preformed holes in such materials and which relies for its holding effect solely on the combined effect of sharp edges threads on the internal and external surfaces ofthe tube screw, engaging the material into which it is rotatably inserted and forming, by cutting as it is rotated into the material, a threaded elongate annular cavity therein.
• the invention provides an open-ended tttbe screw having along at least part of its length external and internal sharp-edged screw threads.
• the tube screw has a constant diameter.
• the invention also provides a method of penetrating a material, comprising presenting the said open- ended tube screw to a material and rotating same whereby it progressively cuts a threaded elongate annular cavity therethrough and optionally thereafter progressively engages by continued rotation a second material to cut a threaded elongate annular cavity at least partly therethrough.
• the method may be used to provide in a single material for the reception e.g. of a hook, or two or more materials.
• the sharp edged screw threads on the external and. internal surfaces of the tube screws of, and for use in the method of, the invention may have a variety of profiles as hereinafter described.
• the tube screws may conveniently be threaded along their entire length and thus be of substantially constant diameter. They may be provided with a profile at their ends whereby a second tube element may be offered up to a first tube screw already inserted in material to be connected, and by rotation further rotate the said first tube element.
• tube elements may be used which have a length shorter than that required to reach a second material to be connected.
• the tube screws of, and for use in the method of, the invention may be used in association with a driver for exerting a rotation thereto when applied to an end of the tube screw.
• a driver may have a profiled end portion adapted to engage a corresponding profile on an end of a tube screw.
• the tube screw is used in association with a driver having an internally- and/or externally threaded hollow end of thread profile corresponding to the threads on the tube screw.
• an assembly is provided of two tube screws disposed parallel to each other, each side of a tongue element preferably having a sharpened leading edge, and rotatably connected to opposite edges of said tongue element.
• the tube screws of, and for use in the method of, the invention may be made of any suitable material capable of being formed into sharp-edged screw threads e.g. by machining. Thus they may be formed of metal, particularly steel or aluminium alloy, or a suitable plastics material e.g. ABS plastics, nylon or polyester plastics material.
• Figure 1 is a longitudinal section of tube screw according to the invention
• Figure 2 is a perspective view of a tube screw provided with profiled ends consisting of thread starts;
• Figures 3(a) to 3(j) are examples of profiles of the threads present on the external and internal surfaces of the tube screw;
• Figure 4 is a side view of a screw in which the screw threads are interrupted threads;
• Figures 5(a) to 5 ( g) are representational examples of alternative profiles which may be applied to the ends of the tube screw;
• Figure 6 is a longitudinal sectional representation of two pieces of wood joined together by a tube screw according to the method of the invention and showing a driving tool in position at the trailing end of the tube screw;
• Figure 7 is a longitudinal sectional representation of the joint of Figure 4 showing a following tube screw in place within a guide therefor;
• Figure 8 is a longitudinal second representation of two pieces of material joined by a tube screw, the open end of which is provided with a stopper;
• Figure 9 is a side view of a tube screw when in position which is provided with an oversize stopper the end of the tube screw becomes splayed;
• Figure 10 is a schematic representation of an assembly according to the invention of two tube screws each rotatably mounted on a side of a control blade element.
• Figure 1 shows one embodiment of a tube screw 1 according to the invention made of thin-walled material e.g. metal or plastics material, having along its length an external sharp-edged screw thread 2 and an internal sharp-edged screw thread 3.
• the internal and external threads are in phase giving a corrugated appearance. If desired however they may be out of phase with each other.
• Figure 2 shows another embodiment wherein the ends 4 , 4 of the tube thread are profiled by the provision of starts 5 presenting a notched appearance.
• Such notched profiles may serve for instance to engage initially the material to which the tube screw is presented, and/or to provide engagement with a correspondingly profiled driving tool, and/or to engage the similarly profiled end of a longitudinally contiguous tube screw when a plurality of tube screws are rotatably driven into material.
• the profiles of the screw threads may take a variety of forms as shown in Figures 3(a) to 3(j), the essential feature being that the threads are sharp-edged.
• Figures 3(a) to 3 (h ) show profiles which are flat-faced
• Figure 3(j) shows a profile which has curved faces.
• the profile of Figure 3(f) may be obtained by subjecting a plain tube to a series of helically-disposed perforations, and then to apply to the thus-perforated tube a band e.g.
• a steel band having one edge sharpened and the other edge profiled to provide sharpened tongues along its length spaced apart from each other so as to fit into adjacent perforations in the tube when the strip is wound helically around the perforated tube, the edges of said tongues being sharpened.
• a tube is provided which has on one surface a sharp-edged continuous thread, and on the other surface a sharp-edged discontinuous thread.
• the profiled band may be spirally wound on or in the tube whereby the continuous thread is either on the outside or the inside surface of the tube.
• One or both screw threads on the tube screw according to the invention may be continuous screw threads, or they may be discontinuous, e.g. as hereinbefore described in relation to Figure 3(f) or as shown in Figure 4 , wherein a series of stamping operations on the tube material produces a series of flanges, generally in a spiral configuration. Such flanges may extend inwardly and outwardly of the tube body.
• one or more flutes may be provided longitudinally of the threads on the tube screw so as to provide a channel for debris generated by the tube screw being rotatably driven into material.
• the ends of the tube screw may be profiled.
• a variety of end profiles may be used, examples of which are illustrated in Figures 5(a) to 5 ( g) .
• Such profiles may be adapted so that the tube screw may be turned in either direction by a correspondingly profiled driving tool e.g. as shown in Figures 5(a) and 5(b), or may be adapted to be released when the direction of rotation of the driving tool is reversed. It is essential that such end profiles are adapted to cut material by a rotating action.
• Figure 6 illustrates a final stage in the method of penetration of the invention when the tube screw has been rotatably driven through a first wood piece 2 into a second wood piece 3 by a hollow threaded driving head 4 mounted on a support 5 which may be rotated either manually or be power driven, the two wood pieces thereby being joined.
• Figure 7 illustrates a method of joining in which after a first tube screw 1 has been inserted into the wood portion as described and illustrated in Figure 6, a following and similar tube screw 2 is presented to the trailing edge of the tube screw, preferably through guide means 3, and rotated so as further to displace the first tube screw 1 deeper into the materials to be joined.
• the ends of the tube screws may be profiled to intercalate with each other, to effect rotation of the leading tube screw by the rotating following tube screw.
• FIG. 8 shows a plug 6 having a hollow threaded portion engaged in the sunken end of the screw plug.
• the shown plug 6 may be in fact a further tube screw according to the invention having an external diameter corresponding to the internal diameter of the tube screw in situ, but provided at its trailing edge with a hook, eye or other fixing.
• the plug 7 having an oversized hollow threaded portion may be used to effect splaying as shown in Figure 9 at 8.
• a hook, eye or other functional fixing may be inserted.
• a particularly interesting use of the tube screws of the invention lies in providing anchoring means in plaster board or similar clad materials having a relatively soft or friable core.
• the tube screw is rotatably driven through the clad material, at least one of the ends standing proud of a cladding into which may be screwed a hook, eye or other functional device.
• the other end also stands proud of the remote cladding, and a bolt of other functional device may be screwed therein, or a segmental end may be turned back to provide an anchoring. In non-accessable voids, such turning back may be achieved by the use of a retractable butterfly device in known manner.
• Figure 10 shows an assembly according to the invention, whereby two tube screws 9 and 10 are each rotatably attached by rings to a side of a central blade element 13 preferably having a sharpened leading edge 14.
• the central portion 13 also enters the material, thus forming a reinforcing element or join therein to join two laterally disposed materials.

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• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Physics & Mathematics (AREA)
• Geometry (AREA)
• Joining Of Building Structures In Genera (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=10515356

Family Applications (1)

Country Status (2)

Cited By (7)

Citations (4)

• 1981
  • 1981-08-11 WO PCT/GB1981/000160 patent/WO1982000505A1/en not_active Application Discontinuation
  • 1981-08-11 EP EP19810902281 patent/EP0057223A1/de not_active Withdrawn

Patent Citations (4)

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