WO2005059377A1 - Two-piece cutting screw - Google Patents

Two-piece cutting screw Download PDF

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Publication number
WO2005059377A1
WO2005059377A1 PCT/AU2004/001794 AU2004001794W WO2005059377A1 WO 2005059377 A1 WO2005059377 A1 WO 2005059377A1 AU 2004001794 W AU2004001794 W AU 2004001794W WO 2005059377 A1 WO2005059377 A1 WO 2005059377A1
Authority
WO
WIPO (PCT)
Prior art keywords
screw
shank
drilling tip
piece cutting
cutting screw
Prior art date
Application number
PCT/AU2004/001794
Other languages
French (fr)
Inventor
To Ha Loi
Original Assignee
Loi & Tran Pty. Limited
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
Priority claimed from AU2003907039A external-priority patent/AU2003907039A0/en
Application filed by Loi & Tran Pty. Limited filed Critical Loi & Tran Pty. Limited
Publication of WO2005059377A1 publication Critical patent/WO2005059377A1/en

Links

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
    • F16B35/00—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws
    • F16B35/04—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws with specially-shaped head or shaft in order to fix the bolt on or in an object
    • F16B35/041—Specially-shaped shafts
    • F16B35/044—Specially-shaped ends
    • 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
    • F16B25/0021—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 material being metal, e.g. sheet-metal or aluminium
    • 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
    • F16B25/0094—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw the screw being assembled or manufactured from several components, e.g. a tip out of a first material welded to shaft of a second material
    • 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
    • F16B25/10—Screws performing an additional function to thread-forming, e.g. drill screws or self-piercing screws

Definitions

  • This invention relates to the area of building materials and fastening tools and in particular, to a screw for use in fastening metallic or steel materials to metal or steel.
  • a self-drilling screw has consisted of a one-piece screw where the tip, shank and head have all been integrally formed.
  • the shank and tip have been altered depending on the sheet material and material of the support that the sheet material needs to be secured to.
  • the invention provides a two-piece screw , for use in the attachment of metallic or steel sheet material, having a shank, a head and a detachable drilling tip.
  • shank of the screw be provided with a hexagonally shaped recessed portion which is adapted to receive the detachable drilling tip.
  • the drilling tip be similar to that of a standard drill bit having at least one cutting edge extending back a prescribed length from the point of the drilling tip.
  • the detachable drilling tip be provided with an outwardly extending portion having a hexagonally shaped perimeter complimentary to, and adapted to fit into, the recessed portion of the shank.
  • shank and the head of the screw be integrally formed from a stainless steel material to prevent rusting of the screw and the adjacent sheet material, and the drilling tip be made from a separate material suitable for cutting through metal or steel.
  • the head of the screw be of the standard shape of a roofing screw, any relatively broad head would suffice. ln order that the invention be more readily understood we will describe by way of non limiting example a specific embodiment thereof.
  • Figure 1 is a perspective view of an embodiment of the two-piece cutting screw according to the invention.
  • Figure 2 is a perspective view of an embodiment of the two-piece cutting screw showing the drilling tip disconnected from the shank of the screw.
  • Figure 3 is a side view of an embodiment of the two-piece cutting screw as it is used in the attachment of sheet material to a support.
  • Figure 4 is a side view of an embodiment of the two-piece cutting screw as it is used in the attachment of sheet material to a support showing the drilling tip becoming dissociated from the shank of the screw once drilled into the support.
  • Figures 1 to 4 show a preferred embodiment of the invention as it relates to a two-piece cutting screw for use in the fastening metallic or steel sheet materials.
  • the screw 1 is provided with a shank 2, a head 3 and a detachable drilling tip 4.
  • the detachable drilling tip 4 is designed to be similar to that of a standard d ⁇ lling bit.
  • the drilling tip 4 is substantially cylindrical in shape with at least one cutting edge 5 extending back from the point 6 of the drilling tip 4.
  • the or each cutting edge 5 extends from the point 6 of the drilling tip 4 back approximately half the length of the drilling tip 4.
  • the length of the drilling tip 4 may vary, and is usually dependent on the requirements of different thicknesses and compositions of the materials that is must fasten.
  • the drilling tip 4 may be made of any suitable material that is adapted to cut through metal or steel.
  • the cutting edge may also vary in shape depending on the material to be worked.
  • the base 7 of the drilling tip 4 is provided with an outwardly extending portion 8 which is adapted to have a width and length smaller than the detachable drilling tip 4.
  • the perimeter 9 of the outwardly extending portion 8 is hexagonal in shape, designed to be similar to that of an alien key, and is adapted to be received by a complimentary recessed portion 10 provided on the shank 2 of the screw 1.
  • the shank 2 of the screw 1 is cylindrical in shape with its length being dependent on the thickness and composition of the metallic or sheet material and metallic or steel support that it must pass through.
  • the shank 2 has provided a threaded portion 11 which may extend along its entire length, or along a substantial part of the shank 2.
  • the threading may be the same as that of a standard tapping screw which either extends along the entire length of the shank 2, or terminates approximately two thirds of the way along the shank 2.
  • the arrangement of the screw 1 is such that in practice, an aperture will first be cut by the drilling tip with the screw 2 being able to self tap its way through the aperture thereafter.
  • a recessed portion 10 adapted to receive the outwardly extending portion 8 of the detachable drilling tip 4.
  • the depth and width of the recessed portion 10 is dependent on the length and width respectively of the outwardly extending portion 8 of the detachable drilling tip 4, as the screw 1 is designed to have relatively snug fit between these two portions 8, 10.
  • the recessed portion 10 is also hexagonally shaped such that is complimentary to the outwardly extending portion 8 of the detachable drilling tip 4 and is thus, adapted to receive the outwardly extending portion 8 therein.
  • the screw 1 is provided with a standard head 13.
  • the head 13 is hexagonally shaped and has a broad base 14 which is adapted to sit over the aperture created by the screw 1 such that, water is prevented from entering through the aperture.
  • the head 13 is integrally formed with the shank 2 of the screw 1.
  • the head 13 and shank 2 of the screw 1 is made of stainless steel or any other suitable material that is non-rusting such that, the screw and/ or the adjacent material around the screw will not rust.
  • the appropriate detachable drilling tip 4 is fitted onto the end of the screw 4 if note already done so.
  • the drilling tip 4 os the screw will then "drill” into the sheet material with the remainder of the screw 1 self-tapping through the material and support once the aperture has been created by the drilling tip 4.
  • the screw 1 is then tightened in place by conventional methods until the sheet material has been secured to the support.
  • the detachable drilling tip 4 Once the detachable drilling tip 4 has "drilled” through the sheet material and support, the drilling tip will become “detached” or “drop off” from the shank 2 of the screw 1 , leaving behind only the shank 2 and head 13 of the screw 1 to secure the sheet material to the support.
  • the screw of the invention provides a simple means of producing an aperture through the sheet material and support, whilst possible damage such as cracking and grazing is minimised.
  • the screw of the invention thereby acts to both minimise damage to roofing material and to achieve this in an efficient manner.
  • this type of screw can be used to attach any kind of metallic or steel sheet material to a metallic or steel support or the like.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Connection Of Plates (AREA)

Abstract

A two-piece cutting screw for use in fastening metallic or sheet metal materials. The screw includes shank (2), head (3) and detachable drilling tip (4). Drilling tip (4) is provided with a projecting portion (8) which is received in complementary recess (10) located in the base of shank (2). In use, drilling tip (4) is fitted to the end of the screw and the resulting screw assembly is drilled through the sheet material and its underlying support with shank (2) self-tapping into place. Drilling tip (4) drops off shank (2) after drilling through and shank (2) and head (3) remain to secure the sheet material in place.

Description

TWO-PIECE CUTTING SCREW
Technical Area
This invention relates to the area of building materials and fastening tools and in particular, to a screw for use in fastening metallic or steel materials to metal or steel.
Background to the invention
Previously, a self-drilling screw has consisted of a one-piece screw where the tip, shank and head have all been integrally formed. Features of the shank and tip have been altered depending on the sheet material and material of the support that the sheet material needs to be secured to.
It has been common for self-drilling screws, for the securing of metallic of steel sheet materials to metal or steel, to be provided with a threaded shank and a drilling tip that has provided two cutting edges adapted to cut through metal or steel.
To date these screws have proved to be relatively unsuccessful in providing an easy, clean cut through the metal or steel, often damaging the adjacent material around the aperture created by the drilling tip. After time, these self-drilling screws will also rust due to the material they are made from. In order to overcome this problem, the self-drilling screw could be made of a material such as stainless steel which is not susceptible to rust however, the problem which arises is that, stainless steel is not capable of drilling through metal or steel. Outline of the invention
It is an object of this invention to provide an improved cutting screw which is specifically intended for use with metallic or steel sheet materials, and which minimises the problems of damage and rust previously caused by such screws.
The invention provides a two-piece screw , for use in the attachment of metallic or steel sheet material, having a shank, a head and a detachable drilling tip.
It is preferred that the shank of the screw be provided with a hexagonally shaped recessed portion which is adapted to receive the detachable drilling tip.
It is preferred that the drilling tip be similar to that of a standard drill bit having at least one cutting edge extending back a prescribed length from the point of the drilling tip.
It is further preferred that the detachable drilling tip be provided with an outwardly extending portion having a hexagonally shaped perimeter complimentary to, and adapted to fit into, the recessed portion of the shank.
It is preferred that the shank and the head of the screw be integrally formed from a stainless steel material to prevent rusting of the screw and the adjacent sheet material, and the drilling tip be made from a separate material suitable for cutting through metal or steel.
While it is preferred that the head of the screw be of the standard shape of a roofing screw, any relatively broad head would suffice. ln order that the invention be more readily understood we will describe by way of non limiting example a specific embodiment thereof.
Brief description of the Drawing Figure
Figure 1 is a perspective view of an embodiment of the two-piece cutting screw according to the invention.
Figure 2 is a perspective view of an embodiment of the two-piece cutting screw showing the drilling tip disconnected from the shank of the screw.
Figure 3 is a side view of an embodiment of the two-piece cutting screw as it is used in the attachment of sheet material to a support.
Figure 4 is a side view of an embodiment of the two-piece cutting screw as it is used in the attachment of sheet material to a support showing the drilling tip becoming dissociated from the shank of the screw once drilled into the support.
Description of an Embodiment of the Invention
Figures 1 to 4 show a preferred embodiment of the invention as it relates to a two-piece cutting screw for use in the fastening metallic or steel sheet materials.
In this embodiment of the invention, the screw 1 is provided with a shank 2, a head 3 and a detachable drilling tip 4. The detachable drilling tip 4 is designed to be similar to that of a standard dπlling bit. The drilling tip 4 is substantially cylindrical in shape with at least one cutting edge 5 extending back from the point 6 of the drilling tip 4. The or each cutting edge 5 extends from the point 6 of the drilling tip 4 back approximately half the length of the drilling tip 4. The length of the drilling tip 4 may vary, and is usually dependent on the requirements of different thicknesses and compositions of the materials that is must fasten. The drilling tip 4 may be made of any suitable material that is adapted to cut through metal or steel. The cutting edge may also vary in shape depending on the material to be worked.
The base 7 of the drilling tip 4 is provided with an outwardly extending portion 8 which is adapted to have a width and length smaller than the detachable drilling tip 4. The perimeter 9 of the outwardly extending portion 8 is hexagonal in shape, designed to be similar to that of an alien key, and is adapted to be received by a complimentary recessed portion 10 provided on the shank 2 of the screw 1.
The shank 2 of the screw 1 is cylindrical in shape with its length being dependent on the thickness and composition of the metallic or sheet material and metallic or steel support that it must pass through. The shank 2 has provided a threaded portion 11 which may extend along its entire length, or along a substantial part of the shank 2. The threading may be the same as that of a standard tapping screw which either extends along the entire length of the shank 2, or terminates approximately two thirds of the way along the shank 2. The arrangement of the screw 1 is such that in practice, an aperture will first be cut by the drilling tip with the screw 2 being able to self tap its way through the aperture thereafter.
Provided on the base 12 of the shank 2 is a recessed portion 10 adapted to receive the outwardly extending portion 8 of the detachable drilling tip 4. The depth and width of the recessed portion 10 is dependent on the length and width respectively of the outwardly extending portion 8 of the detachable drilling tip 4, as the screw 1 is designed to have relatively snug fit between these two portions 8, 10. The recessed portion 10 is also hexagonally shaped such that is complimentary to the outwardly extending portion 8 of the detachable drilling tip 4 and is thus, adapted to receive the outwardly extending portion 8 therein. The screw 1 is provided with a standard head 13. The head 13 is hexagonally shaped and has a broad base 14 which is adapted to sit over the aperture created by the screw 1 such that, water is prevented from entering through the aperture. The head 13 is integrally formed with the shank 2 of the screw 1. The head 13 and shank 2 of the screw 1 is made of stainless steel or any other suitable material that is non-rusting such that, the screw and/ or the adjacent material around the screw will not rust.
It is customary to drill a smaller hole through which the shank of a self-tapping screw may pass thereby requiring a person to use two tools, one to drill the initial hole, and another to drive the screw through the material and into the support. By incorporating a drilling bit styled tip into the screw, the screw of the invention is able to fulfil both of these functions at the same time. Therefore, only one tool is required and additionally, the sheet material is protected from damage.
In practice, the appropriate detachable drilling tip 4 is fitted onto the end of the screw 4 if note already done so. The drilling tip 4 os the screw will then "drill" into the sheet material with the remainder of the screw 1 self-tapping through the material and support once the aperture has been created by the drilling tip 4. The screw 1 is then tightened in place by conventional methods until the sheet material has been secured to the support. Once the detachable drilling tip 4 has "drilled" through the sheet material and support, the drilling tip will become "detached" or "drop off" from the shank 2 of the screw 1 , leaving behind only the shank 2 and head 13 of the screw 1 to secure the sheet material to the support.
The screw of the invention provides a simple means of producing an aperture through the sheet material and support, whilst possible damage such as cracking and grazing is minimised. In addition, by having a detachable tip, it eradicates the chance of the tip, screw, or adjacent material forming rust. The screw of the invention thereby acts to both minimise damage to roofing material and to achieve this in an efficient manner. Whilst we have described herein one particular embodiment of the two-piece cutting screw, and in particular an application as a roofing screw, this type of screw can be used to attach any kind of metallic or steel sheet material to a metallic or steel support or the like.
It is further envisaged that other embodiments of the invention could exhibit variations in the features described. It is however envisaged that other embodiments of the invention will exhibit any number and combination of the features previously described and it is to be understood that variations and modifications in this can be made without departing from the scope thereof.

Claims

The claims defining the invention are as follows:
1. A two-piece cutting screw, for use in the attachment of metallic or steel sheet material, having a shank, a head and a detachable drilling tip.
2. A two-piece cutting screw as claimed in claim 1 wherein the shank of the screw is provided with a recessed portion.
3. A two-piece cutting screw as claimed in claim 2 wherein the recessed portion is adapted to receive the detachable drilling tip.
4. A two-piece cutting screw as claimed in any preceding claim wherein the detachable drilling tip is provided with an outwardly extending portion.
5. A two-piece cutting screw as claimed in claim 4 wherein the outwardly extending portion has a perimeter which is complimentary in shape to the perimeter of the recessed portion such that, it is adapted to fit into, the recessed portion of the shank.
6. A two-piece cutting screw as claimed in claim 5 wherein the perimeter of the outwardly extending portion and recessed portion is hexagonally shaped.
7. A two-piece cutting screw as claimed in any one of the above claims wherein the shank and the head of the screw are integrally formed.
8. A two-piece cutting screw as claimed in claim 7 wherein the shank and head are made of a stainless steel material.
9. A two-piece cutting screw as claimed in any preceding claim wherein the drilling tip is made from a material suitable for cutting through metal or steel.
10. A two-piece cutting screw as claimed in claim 9 wherein the drilling tip has at least one cutting edge.
11. A two-piece cutting screw, substantially as herein described with reference to the accompanying drawings.
DATED this 20 day of December, 2004
PCT/AU2004/001794 2003-12-18 2004-12-20 Two-piece cutting screw WO2005059377A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU2003907039A AU2003907039A0 (en) 2003-12-18 Two-piece cutting screw
AU2003907039 2003-12-18

Publications (1)

Publication Number Publication Date
WO2005059377A1 true WO2005059377A1 (en) 2005-06-30

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU2004/001794 WO2005059377A1 (en) 2003-12-18 2004-12-20 Two-piece cutting screw

Country Status (1)

Country Link
WO (1) WO2005059377A1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103438075A (en) * 2013-07-03 2013-12-11 倍信机械设备贸易(上海)有限公司 Bolt structure
CN104633335A (en) * 2015-01-30 2015-05-20 无锡市曙光高强度紧固件有限公司 Hexagon bolt for pipe flange
WO2015157387A1 (en) * 2014-04-10 2015-10-15 Simpson Strong-Tie Company, Inc. Metal to metal fastener
DE102015106561A1 (en) * 2015-04-28 2016-11-03 Airbus Operations Gmbh Fastening device for non-positive connection of structural components
CN110248798A (en) * 2017-02-09 2019-09-17 中车青岛四方机车车辆股份有限公司 For component to be connected to the connecting element of fiber compound structure

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB585887A (en) * 1944-08-29 1947-02-27 Albert Ernest Applegate Improvements in screwed bolts
US4022099A (en) * 1976-02-06 1977-05-10 General Motors Corporation Threaded fastener with reusable thread forming pilot tip
US4617692A (en) * 1983-12-30 1986-10-21 Emhart Corporation Tool for drilling and securing screw anchor to a wall
US4900208A (en) * 1988-06-09 1990-02-13 Kaiser Norbert O Roofing fastener
US4958972A (en) * 1988-11-25 1990-09-25 Yugen Kaisha Shinjoseisakusho Breakable composite drill screw
US5899123A (en) * 1995-06-26 1999-05-04 Textron, Inc. Break-off drillpoint screw

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB585887A (en) * 1944-08-29 1947-02-27 Albert Ernest Applegate Improvements in screwed bolts
US4022099A (en) * 1976-02-06 1977-05-10 General Motors Corporation Threaded fastener with reusable thread forming pilot tip
US4617692A (en) * 1983-12-30 1986-10-21 Emhart Corporation Tool for drilling and securing screw anchor to a wall
US4900208A (en) * 1988-06-09 1990-02-13 Kaiser Norbert O Roofing fastener
US4958972A (en) * 1988-11-25 1990-09-25 Yugen Kaisha Shinjoseisakusho Breakable composite drill screw
US5899123A (en) * 1995-06-26 1999-05-04 Textron, Inc. Break-off drillpoint screw

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103438075A (en) * 2013-07-03 2013-12-11 倍信机械设备贸易(上海)有限公司 Bolt structure
WO2015157387A1 (en) * 2014-04-10 2015-10-15 Simpson Strong-Tie Company, Inc. Metal to metal fastener
CN104633335A (en) * 2015-01-30 2015-05-20 无锡市曙光高强度紧固件有限公司 Hexagon bolt for pipe flange
DE102015106561A1 (en) * 2015-04-28 2016-11-03 Airbus Operations Gmbh Fastening device for non-positive connection of structural components
CN110248798A (en) * 2017-02-09 2019-09-17 中车青岛四方机车车辆股份有限公司 For component to be connected to the connecting element of fiber compound structure

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