WO2000020767A1 - Threaded fastening system - Google Patents
Threaded fastening system Download PDFInfo
- Publication number
- WO2000020767A1 WO2000020767A1 PCT/AU1999/000859 AU9900859W WO0020767A1 WO 2000020767 A1 WO2000020767 A1 WO 2000020767A1 AU 9900859 W AU9900859 W AU 9900859W WO 0020767 A1 WO0020767 A1 WO 0020767A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- fastener
- shank
- cutting means
- sheet
- cutter
- Prior art date
Links
- 238000005520 cutting process Methods 0.000 claims abstract description 24
- 238000005553 drilling Methods 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 11
- 238000007789 sealing Methods 0.000 claims description 8
- 230000036346 tooth eruption Effects 0.000 claims description 3
- 230000000717 retained effect Effects 0.000 claims description 2
- 239000000463 material Substances 0.000 description 16
- 238000005253 cladding Methods 0.000 description 11
- 238000009434 installation Methods 0.000 description 9
- 229920001971 elastomer Polymers 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 229920000515 polycarbonate Polymers 0.000 description 4
- 239000004417 polycarbonate Substances 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 239000002184 metal Substances 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 238000009987 spinning Methods 0.000 description 3
- 230000004888 barrier function Effects 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 230000007717 exclusion Effects 0.000 description 1
- 239000011152 fibreglass Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
- 239000012858 resilient material Substances 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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
- 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
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04D—ROOF COVERINGS; SKY-LIGHTS; GUTTERS; ROOF-WORKING TOOLS
- E04D3/00—Roof covering by making use of flat or curved slabs or stiff sheets
- E04D3/36—Connecting; Fastening
- E04D3/3605—Connecting; Fastening of roof covering supported directly by the roof structure
- E04D3/3606—Connecting; Fastening of roof covering supported directly by the roof structure the fastening means being screws or nails
-
- 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
- F16B25/103—Screws performing an additional function to thread-forming, e.g. drill screws or self-piercing screws by means of a drilling screw-point, i.e. with a cutting and material removing action
Definitions
- This invention concerns the use of threaded screw fasteners and has particular relevance to screws for affixing to an underlying structure architectural sheet profiles made from materials which have a high coefficient of thermal expansion. It is especially useful with roofing profiles made from non-metallic roofing profiles such as those made from polycarbonate, PNC or fibreglass reinforced polyester resin.
- Transparent and translucent roofing materials made from non-metallic materials are becoming increasingly popular. These are used alone or in conjunction with roll formed steel sheeting to allow light transmission through the roof. When compared with glass, such plastics are lighter in weight, more resistant to impact damage, easier to install and considerably cheaper. Polycarbonate sheeting in particular is becoming increasingly popular because of its perceived superior performance.
- An object of the present invention is to alleviate the disadvantages of the prior art.
- the more preferred embodiments provide self-drilling fasteners which create a sufficiently large hole in sheeting to provide for thermal expansion without the need for the additional reaming operation, allow for single tool operation for installation, overcome the difficulties of centring and overcome the difficulties of over-driving.
- the invention provides a screw fastener for attaching a profiled sheeting panel to a support, said fastener having: (i) an elongate cylindrical shank; (ii) an enlarged head at one end of the shank adapted for engagement with a driving tool; (iii) a piercing tip on the other end of the shank;
- the cutting means is cup shaped.
- said shank passes axially through the cup shaped cutting means.
- the cutting means comprises a circular cup with cutting teeth spaced around its perimeter.
- the cutting means is captive upon said shank and the shank passes axially through the centre of the cup.
- the cutting means may engage with the shank by means of a keyed bore on the cutting means engaging with a matingly keyed portion on the shank.
- the cutting means may have a smooth bore which frictionally engages with a tapered serrated collar on the shank.
- the cutting means may have a bore which frictionally engages with tapered ramps upstanding from the shank.
- an elastomeric sealing means is fitted on the fastener between the cutting means and the head.
- the sealing means comprises a domed topside, a central bore and a dished underside, said underside having two concentric sealing rims each of larger diameter than said circular incision.
- the invention provides a method of fixing a profiled architectural sheet to a support member whereby a threaded fastener passes through the sheet and into the support member, said fastener having a head at one end and a tip on its threaded portion at the other end and a cutter portion distant from the tip, said method comprising:
- the fastener is screwed into the supporting member until the cutter bears against the support member.
- a resilient washer is provided on the fastener between the cutter and the head, and the washer forms a waterproof seal between the head and the sheet when the cutter portion bears against the supporting member.
- the fastener cuts out a washer shape from the sheet and that washer shaped cutout is retained on the fastener.
- the fasteners of the present invention are thus able to cut a hole through the sheeting with a substantial clearance for the fastener.
- the panels are therefore able to expand and contract considerably relative to the supporting frame without contacting the fastening screws.
- the preferred fasteners also stop at the correct depth and avoid being over-driven.
- Figure 1 is a generally side-on view of a fastener according to a first embodiment of the present invention
- FIG 2 is another view of the fastener shown in Figure 1;
- Figure 3 is a side view of one component of a second embodiment which is a similar fastener to that shown in Figures 1 and 2;
- Figure 4 is a plan view of another component of the second embodiment;
- Figure 5 is a cross section along line A-A shown in Figure 4;
- Figure 6 is a side view of the component shown in Figure 4.
- Figure 7 is a view similar to Figure 1 but showing a fastener according to a third embodiment of the invention which is more preferred;
- Figure 8 is a view similar to Figure 2 but showing the fastener of Figure 7;
- Figure 9 is a cross section view through the centre of a component of the fastener shown in Figure 8;
- Figure 10 is a view similar to Figure 7 but showing a fastener according to a fourth and most preferred embodiment of the invention;
- Figure 11 is a view similar to Figure 8 but showing the fastener of Figure 10;
- Figure 12 is a perspective view of one component of the fastener shown in Figure
- Figure 13 is a side view of the component shown in Figure 12;
- Figure 14 is a side view of the fastener shown in Figure 10 part way through its installation with a roofing profile
- Figure 15 is a view like that of Figure 14 but with the fastener fully installed.
- the screw fastener 2 is an assembly of three main components, namely a body 4, a weather seal 30 and a cutter 40.
- the body 4 has an elongated cylindrical shank 6 with an enlarged head 8 at one end.
- the head has a hexagonal top 10, for engagement with a driving tool, and a collar 12.
- a thread 14 is at the other end of the shank 6 with a drilling tip 16 formed by a slot 18 cut into the thread.
- a weather seal 30 is fitted to the shank 6 beneath the collar 12.
- the weather seal is a type of washer moulded from a suitable rubber, other elastomer or other resilient material.
- the seal 30 has a domed top 32 and a tapered boss 34 within a concave underside 36. It should be noted however that it is preferred that the boss 34 is omitted so that it cannot fill the hole in the sheet and limit lateral movement of the sheet relative to the fastener.
- a cutter 40 is fitted to the shank 6 by way of its keyed bore 46 engaging with four upstanding keys 48 on the shank which prevent rotation of the cutter 40 relative to the shank 6.
- the cutter is generally square in shape, with four turned down teeth 50 at its perimeter.
- the cutter 53 has a generally planar square shaped body portion 55 from which four peripheral teeth 50 extend towards the drilling tip end of the fastener. In operation the cutter acts in the general manner of a hole saw, cutting the periphery of the required hole.
- the second embodiment fastener 51 has a screw body 52 and cutter 53 which are similar to the corresponding components in Figures 1 and 2.
- the second embodiment has a smooth bore 54 in the cutter 53 which press fits onto a serrated collar 56 on the shank of body 52.
- the collar 56 is tapered at 15° to provide a suitable lock with the bore 54 and the serrations on the collar are aligned with a right-handed twist in order to provide an even better lock into the bore 54.
- the fastener's weather seal is like the seal 30 in Figure 1 but has been omitted from Figure 3 for ease of illustration.
- the installation of the fasteners 2 and 51 proceed in a substantially identical manner.
- the hexagonal top 10 is engaged with a driving tool and rotated with the tip 16 in contact with the sheeting being fastened as cladding material.
- the tip 16 and then the slot 18 cut their way through the sheeting, creating a hole about equal to the minor diameter of thread, and move on to contact the support frame which would usually be timber or metal.
- the tip 16 commences drilling into the support and this locates the tip to prevent it sliding around on the surface.
- the teeth 50 engage the top of the cladding.
- the keyed cutter 40 of fastener 2 would have been fully engaged with the keys 48 and the cutter 40 would be spirming locked with the shank of the screw.
- the taper locked cutter 53 of the fastener 51 is supplied loosely spinning on the shank and only locks onto the collar 56 when pressed on to it. So, as the teeth 50 engage the top of the cladding and thus press the cutter back against the serrated collar 56, the cutter starts rotating. In each case the teeth then cut, in the manner of a hole saw, a circular groove in the cladding.
- the groove is spaced away from the hole created by the drilling tip 16.
- the teeth cut the enlarged hole by cutting along the line of a circle which circumscribes cladding material which is not being cut.
- a washer-like piece of cladding material is left on the screw and this rises to nest between the teeth of the cutter, taking no further active part in the operation.
- the teeth are drawn onto and into the cladding by the thread 14 feeding into the support frame.
- the cladding is cut through within one or two rotations of the fastener.
- the cutter mechanically works the sheet material in the peripheral groove which the teeth excavate, and creates the required large clearance hole without mechanically working most of the material removed from the hole. This is substantially more efficient than conventional drilling of a hole where all the material removed is mechanically worked.
- the screw then continues to penetrate the support until the cutter 40 or 53 bears against the support surface, which causes a large and rapid increase in the torque required to rotate it further, and thus indicates to the operator rotation should stop, so stopping further penetration and thus preventing over-drive of the fastener.
- the location of the cutter on the shank of the screw is preferably predetermined relative to the underside of the collar 12 for the particular profile of cladding being fixed, and this location takes account of the dimensions of the weather seal.
- the method of installation ensures that the fastener is installed exactly central to the clearance hole in the sheeting.
- fastener shown in Figures 7 and 8 is a screw 59 which is also very similar to that shown in Figures 1 and 2. The two significant differences are the means by which the cutter 60 is prevented from rotating and the shaping of the underside of the weather seal 66.
- the cutter 60 of Figures 7 and 8 like the cutter 53 of Figure 4, has a smooth bore and locks onto the shank 62 by way of interference with a series of ribs or protrusions on the shank.
- these ribs take the form of six gently sloping ramps 64 upstanding from the shank 62.
- the outermost surfaces of the ramps form a taper of about 5° onto which the bore of the cutter is, or becomes, jammed. This taper is significantly shallower in slope than the bevelled section on the collar 56 in Figure 3.
- the ramps 64 are evenly spaced around the shank and spiral in a right handed helix to better grip the bore of cutter 60 and prevent it spinning. In this respect the ramps 64 can be considered as forming a very coarse multi-start thread which gradually increases its diameter.
- the cutter 60 is captive upon the unthreaded portion of the screw shank between the main screw thread 63 and the ramps 64. This may be achieved by assembling the cutter 60 onto the shank 62 before the thread 63 is rolled onto the screw body.
- the fastener is preferably supplied to the end user as a pre-assembled combination of the screw body 61, rubber weather seal 66 and cutter 60.
- the cutter need not be supplied fully engaged with, or jammed onto, the ramps 64; it may conveniently be left partly along the screw thread. Whatever its initial position, the cutter will automatically be pushed up onto the ramps 64 when the thread feeds into the support frame.
- the weather seal 66 seen in Figure 8 has no such boss but instead carries an additional sealing rim.
- Figure 9 which is a cross section view through the seal 66.
- the seal has a domed top 67 with a central bore 70 surrounded by an outer rim 68 and an inner rim 69.
- the screw is tightened sufficiently that both inner and outer rims make contact fully around their perimeter with the sheeting being fastened.
- the resilience of the seal's rubber material means the rims 68 and 69 can adapt to and seal against a wide variety of sheeting profiles.
- the diameter of the inner rim 69 is greater than the diameter of the hole cut by the cutter in the sheeting.
- the body 72 of the fastener 71 and the weather seal 74 are almost the same as the equivalent components shown in Figures 7 and 8. The only significant difference is that the spiral ramps 76 on fastener body 72 are somewhat shorter and more steeply inclined at IV ⁇ - compared with the 5° inclination of ramps 64 in Figure 8.
- the peripheral surface of the ramps is preferably inclined at between 6.5° and 8.5°
- Cutter 78 mounted on fastener 71 is substantially different to cutter 60 on fastener 59.
- Cutter 78 has a circular shaped planar main body 80 from which four equally spaced cutting teeth 82 extend axially of the fastener. It is press formed from sheet metal such as 1mm thick sheet steel.
- the cutter's central bore 84 is a slack clearance fit on the unthreaded portion of the screw body 72, but is small enough such that it cannot easily be removed over the main thread of the fastener.
- the circular cutter 78 is preferred because it more reliably accommodates a cut off disc of curved sheeting material within the cutter without jamming when overlapping sheets mean more than a single sheet is being drilled at the same time.
- the cutter 78 is shown in the Figures as having a flat upper face 86. A modification whereby this upper face is domed has been found to provide a significant improvement in the stiffness of the cutter so that it undergoes less distortion when it engages abruptly with the support timber or steel into which the fastener is being screwed.
- fastener 71 follows the same general procedure described above in relation to the fasteners of Figures 2 and 3.
- the hexagonal head 73 is engaged with a driving tool and rotated with the tip 75 in contact with the profiled sheeting 88 being fastened.
- the tip 75 and then the slot 77 cut their way through the sheeting, creating a hole about equal to the minor diameter of thread on the body 72, and move on to contact a support 90 which is metal in this illustration.
- the tip 75 commences drilling into the support 90 and this locates the tip to prevent it sliding around on the surface.
- the screw 71 then continues to penetrate into the support 90 until the tips of the teeth 82 hit the support surface. This causes a large and rapid increase in the torque required to rotate it further, and thus indicates to the operator rotation should stop. In the case of a steel support 90, the stopping is particularly abrupt and a torque limiting power tool is recommended. This is the stage of the installation shown in Figure 15.
- the weather seal 74 has come into the appropriate degree of contact and pressure against the sheeting.
- the present invention utilises a cutter which cuts only the circumference of a circle and leaves a disc of sheeting material on the shank of the fastener.
- a method of making the relatively large hole is advantageous because it involves cutting the minimum amount of sheeting material. This is advantageous when the cutter is being fed through the sheeting at such a high rate in accordance with the pitch of the thread.
- the preferred embodiments described above utilize a slotted tip to pierce the sheet and enter the support frame.
- Other types of drilling tips such as fluted tips may also be suitable, as could be tips for flow drilling.
- Tips suited to percussive penetration may also be used, in which case the screw tip would, by impact, penetrate the sheet and partly into the support frame and thereafter be rotated in order for the thread to feed into the support frame and the cutter to circumscribe its groove through the sheet at the circumference of the hole.
- the toothed hole-saw type of configuration of the cutter may be replaced by a sharp edged slicing arrangement which may have a continuous or discontinuous edge.
- the cutter may carry an abrasive edge or an edge that cuts by melting the sheet material.
- the toothed type of cutter is preferred because of its ability to displace a large amount material with a minimum rotation of the fastener, this being important because the fastener thread is feeding at a fixed rate defined by the pitch of the thread at the time the circle is being cut.
- the fasteners of the embodiments described above with reference to the Figures all have a hexagonal head.
- Other types of driven heads are also applicable to the invention and these include slotted heads, Philips heads, hexagonal socket heads and 6-lobed heads.
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU10193/00A AU757669B2 (en) | 1998-10-06 | 1999-10-06 | Threaded fastening system |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AUPP6379A AUPP637998A0 (en) | 1998-10-06 | 1998-10-06 | Improvements in threaded fastening systems |
AUPP6379 | 1998-10-06 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2000020767A1 true WO2000020767A1 (en) | 2000-04-13 |
Family
ID=3810599
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/AU1999/000859 WO2000020767A1 (en) | 1998-10-06 | 1999-10-06 | Threaded fastening system |
Country Status (2)
Country | Link |
---|---|
AU (1) | AUPP637998A0 (en) |
WO (1) | WO2000020767A1 (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2001042669A1 (en) | 1999-12-10 | 2001-06-14 | Sfs Intec Holding Ag | Bolt for fixing, at a distance, covering plates or rails on a substructure |
EP2685025A1 (en) * | 2012-07-09 | 2014-01-15 | Pias Sales Co., Ltd. | Screw for fixing a roof member or exterior wall member both having three-layer structure |
AU2008201679B2 (en) * | 2007-04-18 | 2014-10-02 | Loi & Tran Pty. Limited | Improved screw (separate wing) |
AU2016202639B1 (en) * | 2016-04-26 | 2017-05-11 | Avious Enterprise Co., Ltd. | A Fastener for use in a Corrugated Board |
CN107327460A (en) * | 2016-04-28 | 2017-11-07 | 艾伯斯实业有限公司 | Wave plate screw assembly |
CN110332196A (en) * | 2019-07-23 | 2019-10-15 | 湖南省合和顺信息技术咨询有限公司 | One kind is from the locking connection component of reaming waterproof |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1385139A (en) * | 1972-10-30 | 1975-02-26 | Deutsher Pty Ltd | Screws |
DE2611395B1 (en) * | 1976-03-18 | 1977-07-07 | Opheis Gmbh & Co | Device for fastening profiled roofing panels on a roof structure |
GB2159745A (en) * | 1984-05-25 | 1985-12-11 | Sfs Stadler Ag | A drill screw |
US5295774A (en) * | 1990-01-16 | 1994-03-22 | W. A. Deutsher Pty. Ltd. | Screw and method of making same |
-
1998
- 1998-10-06 AU AUPP6379A patent/AUPP637998A0/en not_active Abandoned
-
1999
- 1999-10-06 WO PCT/AU1999/000859 patent/WO2000020767A1/en active IP Right Grant
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1385139A (en) * | 1972-10-30 | 1975-02-26 | Deutsher Pty Ltd | Screws |
DE2611395B1 (en) * | 1976-03-18 | 1977-07-07 | Opheis Gmbh & Co | Device for fastening profiled roofing panels on a roof structure |
GB2159745A (en) * | 1984-05-25 | 1985-12-11 | Sfs Stadler Ag | A drill screw |
US5295774A (en) * | 1990-01-16 | 1994-03-22 | W. A. Deutsher Pty. Ltd. | Screw and method of making same |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2001042669A1 (en) | 1999-12-10 | 2001-06-14 | Sfs Intec Holding Ag | Bolt for fixing, at a distance, covering plates or rails on a substructure |
DE19959672A1 (en) * | 1999-12-10 | 2001-06-21 | Sfs Ind Holding Ag Heerbrugg | Screw for fixing cover plates or rails to a substructure |
DE19959672C2 (en) * | 1999-12-10 | 2002-04-18 | Sfs Ind Holding Ag Heerbrugg | Screw for fixing cover plates or rails to a substructure |
AU2008201679B2 (en) * | 2007-04-18 | 2014-10-02 | Loi & Tran Pty. Limited | Improved screw (separate wing) |
EP2685025A1 (en) * | 2012-07-09 | 2014-01-15 | Pias Sales Co., Ltd. | Screw for fixing a roof member or exterior wall member both having three-layer structure |
AU2016202639B1 (en) * | 2016-04-26 | 2017-05-11 | Avious Enterprise Co., Ltd. | A Fastener for use in a Corrugated Board |
CN107327460A (en) * | 2016-04-28 | 2017-11-07 | 艾伯斯实业有限公司 | Wave plate screw assembly |
CN110332196A (en) * | 2019-07-23 | 2019-10-15 | 湖南省合和顺信息技术咨询有限公司 | One kind is from the locking connection component of reaming waterproof |
Also Published As
Publication number | Publication date |
---|---|
AUPP637998A0 (en) | 1998-10-29 |
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