GB2124318A - A screw threaded fastener and fastened assembly - Google Patents

A screw threaded fastener and fastened assembly Download PDF

Info

Publication number
GB2124318A
GB2124318A GB8319624A GB8319624A GB2124318A GB 2124318 A GB2124318 A GB 2124318A GB 8319624 A GB8319624 A GB 8319624A GB 8319624 A GB8319624 A GB 8319624A GB 2124318 A GB2124318 A GB 2124318A
Authority
GB
United Kingdom
Prior art keywords
fastener
head
shank
sheet metal
screw
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
GB8319624A
Other versions
GB8319624D0 (en
Inventor
John E Bettini
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Illinois Tool Works Inc
Original Assignee
Illinois Tool Works Inc
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 Illinois Tool Works Inc filed Critical Illinois Tool Works Inc
Publication of GB8319624D0 publication Critical patent/GB8319624D0/en
Publication of GB2124318A publication Critical patent/GB2124318A/en
Withdrawn legal-status Critical Current

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
    • 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
    • F16B25/0057—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 screw having distinct axial zones, e.g. multiple axial thread sections with different pitch or thread cross-sections
    • 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
    • F16B25/0057—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 screw having distinct axial zones, e.g. multiple axial thread sections with different pitch or thread cross-sections
    • F16B25/0063—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 screw having distinct axial zones, e.g. multiple axial thread sections with different pitch or thread cross-sections with a non-threaded portion on the shaft of the screw
    • 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
    • F16B5/0275—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 the screw-threaded element having at least two axially separated threaded portions

Landscapes

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

Abstract

A screw-threaded fastener 10 for attaching articles 28 of predetermined thicknesses to sheet metal 30, the fastener 10 including a head 12 at one end, a generally cylindrical elongate shank, a tip 22 at the other end, a plurality of discrete threaded sections 26a and 26b on the shank and at least one annular unthreaded shank portions 24 between each pair of the thread sections 26a and 26b. The annular unthreaded shank portion 24 is spaced from the head at a predetermined distance or at predetermined distances which correspond to the predetermined thickness of articles to be fastened. Thus, when the head 12 of the fastener 10 is seated, the fastener is free to rotate without continued advancement with the sheet metal 30 being located at the unthreaded portion 24. Naturally when a plurality of unthreaded portions 24 are included the fastener 10 can accommodate articles of different thickness. The annular portions 24 can be given a greater axial extent to allow the screw to move relative to the panel when the panel is compressed in the vicinity, thereby preventing the screw head from penetrating an overlying membrane. <IMAGE>

Description

SPECIFICATION A screw threaded fastener and fastened assembly This invention relates to screw threaded fasteners generally and in particular to fasteners which are used to attach articles to thin sheet metal. Fastening material such as rigid insulation and plaster board to steel studs in the construction of a building is an example of an environment where the present invention is useful.
The attachment of material such as rigid insulating and plaster board, to steel studs has previously been accomplished with screws or various types.
In many instances it is desirable to minimise damage to these materials as the head of the screw is seated. It is also desirable to minimise damage resulting from over-tightening or from slippage of a driving bit out of the driving recess of the fastener. Efforts to accomplish these ends have involved the use of specially designed screw heads and the use of screw driving tools with automatic torque limit clutches.
According to a first aspect of this invention a screw-threaded fastener for attaching an article of predetermined thickness to sheet metal includes a head, a generally cylindrical elongate shank, helical threads on the shank, and at least one annular unthreaded portion of limited axial extent on the shank, the portion being located on the shank at a predetermined distance from the head, the distance corresponding to the predetermined thickness of the article, so that, when the head of the fastener is seated, the fastener is free to rotate without continued advancement.
According to a second aspect of this invention a screw-threaded fastener for attaching articles of a variety of predetermined thicknesses to sheet metal includes a head at one end, a generally cylindrical elongate shank, a tip at the other end, a plurality of discrete threaded sections on the shank, and a plurality of annular unthreaded shank portions adjacent each of the thread sections, the annular unthreaded shank portions being spaced from the head at predetermined distances, the predetermined distances corresponding to the predetermined thicknesses of articles to be fastened, so that, when the head of the fastener is seated, the fastener is free to rotate without continued advancement.
The present invention also includes a fastened assembly including a fastener in accordance with the first or second aspect.
Fasteners accordance with this invention are used for attaching material of predetermined thickness to sheet metal with minimum damage to the material. An embodiment in accordance with the invention provides a fastener which may be used to fasten material of a variety of predetermined thickness. An advantage of a fastener in accordance with this invention is that it can be driven without requiring the use of a clutch-type screw driving gun.
Various embodiments of fasteners and fastened assemblies in accordance with this invention will now be described with reference to the accompanying drawings; in which: Figure 1 is a partly sectioned side elevation of a first embodiment; Figures 2, 3 and 4 are all partly sectioned side elevations of a second embodiment showing how it is used to fasten articles of different thicknesses; Figure 5 is a partly sectioned side elevation of the second embodiment during installation; and Figure 6 is a side elevation of a third embodiment.
Referring to the drawings in which similar parts are designated by the same numerals, a screw 10 has a head 1 2 with driving recess 14. The fastener has a shank 1 6 with threads 1 8. In the preferred embodiment the fastener 10 has a drilling tip 22.
The threads 18 are interrupted by unthreaded portions 24 forming a plurality of threaded sections 26. Threaded sections 26 are numbered consecutively 26a, 26b, etc., starting at the section closest to the tip 22. An article 28 is fastened to thin sheet metal 30. In the preferred embodiment the fastener includes an annular ring 32.
Fig. 1 shows a screw 10 in accordance with the present invention attaching an article 28 to a steel sheet metal stud. As the drilling tip 22 penetrates the sheet metal 30 an opening 31 is formed therein. The threads 1 8 on the first threaded section 26a engage the sheet metal 30. The unthreaded portion 24 adjacent the threaded sections 26a and 26b is located on the shank 1 6 such that when the head 12 of the screw is properly seated with respect to the article 28, the threads 18 no longer advance the screw through the sheet metal 30. Thus, there is no danger of over tightening the screw. Also, the possibility of a driving bit "walking" or "climbing" out of the recess 14 is greatly lessened because there is reduced resistance to rotation.The resistance to penetration provided by the head 1 2 of the fastener is sufficient to prevent continued advancement of the screw. And, the threads 1 8 on the threaded section 26a provide resistance to pull out forces exerted on the screw 10 or the article 28.
An important feature of a screw embodying the present invention is the resistance to loosening caused by vibration. The opening 31 formed in the sheet metal 30 may assume a helical configuration or if the screw has a thread cutting feature the opening may be planar but noncircular. There is reduced resistance to rotation when the screw is fully driven due to the unthreaded portions 24 of the screw. Thus, the screw will generally be rotated beyond the point where threaded engagement exists. In order to loosen, a screw must first be moved to the point where the threads can fit through the opening.
Since, there is only one position which will allow the screw to begin to disengage and since it is very unlikely that the screw will find that position, the resistance to loosening due to vibration will be improved with the present invention.
Figs.2,3 and 4 illustrate that a single screw can be used with articles of varying predetermined thicknesses. In many situations, insulation material at different thicknesses are used at a single jobsite. An alternative embodiment of the present invention includes a plurality of unthreaded portions 24, and corresponding plurality of threaded sections 26. Fig. 2 shows the fastener 10 attaching an article 28 of relatively large thickness. Figs. 3 and 4 show that the same fastener could be used to attach articles of lesser thickness.
Fig. 5 shows that, without the resistance to penetration provided by the interaction of the head 12 and the article 28, continued penetration of the fastener can be accomplished by a slight application of axial force together with continued rotation of the fastener. Because insulation materials and plaster board are made to fairly exacting tolerances, a single screw of the present invention can accommodate a variety of thicknesses. The distance between the head 1 2 and the various unthreaded portions 24 can be made to correspond to the thicknesses of material most commonly used, such as 3/8", 1/2", 3/4" or 1",(9,12,i8or2Smm).
The annular ring 32 serves as a secondary positive limit to prevent inadvertent excessive penetration when the fastener is used with the thinnest of articles. The ring 32 is separated from the uppermost threaded section by an unthreaded portion 24. As the ring 32 abuts the sheet metal 30 the fastener is free to rotate without further advancement.
It should be understood that it may be desirable to increase the root or crest diameter or both root and crest diameter of succeeding threaded portions. The use of a fastener of the present invention with thinner panels may cause the opening 31 to expand as succeeding threaded section 26 is forced into re-engagement with the sheet metal 30. To compensate for this expansion it may be necessary to make succeeding threaded sections 26 larger, i.e., increasing from tip 22 to head 12. Also, it may be desirable to make the unthreaded portions 26 of a diameter less than adjacent root diameters.
The length of the unthreaded shank portion will preferably coincide with the thickness of the sheet metal to which the article is attached, and will therefore be of limited axial extent. The threads above and below the unthreaded portion will prevent displacement of the screw in either axial directions unless the screw is rotated. The extent of the unthreaded portion may be greater than the thickness of the sheet to which the article is attached, especially if the screw is used with rigid insulation. When used with rigid material, a screw of the present invention will not advance beyond the unthreaded portion when the head of the screw contacts the materials being fastened, because the rigid material will be able to withstand forces tending to make the head of the screw penetrate beyond the surface of the material.
The screw shown in Fig. 6 has multiple unthreaded portions 24 with diameters which increase from tip to head. The unthreaded portions are of greater axial extent than the thickness of the sheet material. An extended unthreaded portion 24 will cause the screw to rapidly advance through the sheet metal. The rapid advancement will create an impact which will facilitate the penetration of the larger succeeding threaded sections through the sheet metal.
In the alternative embodiment shown in Fig. 6, the greater axial extent of unthreaded portions 24 has an additional desirable function in some applications. When used to fasten compressible roofing insulation to a metal deck, for example, the unthreaded portion 24 will allow the screw to deflect downward relative to the deck without damaging roofing material which has been installed over the head of the screw.
The provision for downward movement of the screw eliminates the possibility that the head of the screw will poke through a roofing membrane when insulation near the screw is compressed.

Claims (13)

1. A screw-threaded fastener for attaching an article of predetermined thickness to sheet metal, the fastener including a head, a generally cylindrical elongate shank, helical threads on the shank, and at eat one annular unthreaded portion of limited axial extent on the shank, the portion being located on the shank at a predetermined distance from the head, the distance corresponding to the predetermined thickness of the article, so that, when the head of the fastener is seated, the fastener is free to rotate without continued advancement.
2. A screw-threaded fastener for attaching articles of a variety of predetermined thicknesses to sheet metal, the fastener including a head at one end, a generally cylindrical elongate shank, a tip at the other end, a plurality of discrete threaded sections on the shank, and a plurality of annular unthreaded shank portions adjacent each of the thread sections, the annular unthreaded shank portions being spaced from the head at predetermined distances, the predetermined distances corresponding to the predetermined thicknesses of articles to be fastened, so that, when the head of the fastener is seated, the fastener is free to rotate without continued advancement.
3. A fastener according to claim 1 or 2, wherein the crest diameter in each threaded section is uniform and wherein the root diameter in each threaded section is uniform.
4. A fastener according to claim 1 or 2, wherein the crest diameter of the threads in successive thread sections increases from tip to head.
5. A fastener according to claim 4, wherein the root diameter of the threads in successive sections increases from tip to head.
6. A fastener according to claim 1 or 2, wherein each threaded section has a tapering thread form in which its crest diameter increases from tip to head, and its root diameter remains constant.
7. A fastener according to any one of the preceding claims, which also includes an annular ring having a diameter greater than the root diameter of any threaded section, the ring being located between the threaded sections and the head to prevent further advancement of the fastener.
8. A fastener according to any one of the preceding claims, wherein the threaded sections all have similar pitch.
9. A fastener according to any one of the preceding claims, wherein the unthreaded portion or portions have a diameter less than the root diameter of adjacent threaded sections.
10. A fastener substantially as described with reference to the accompanying drawings.
11. A fastened assembly comprises a fastener in accordance with any one of the preceding claims, an article of predetermined thickness and a sheet metal support, the head of the fastener engaging and seating against the article and the, or an unthreaded portion being adjacent the sheet metal support, so that the fastener is free to rotate without continued advancement.
12. A fastened assembly according to claim 11, wherein the unthreaded shank portions have an axial extent substantially equal to the thickness of the sheet metal support.
13. A fastened assembly according to claim 11, wherein an unthreaded portion has an axial extent greater than the thickness of the sheet metal support.
GB8319624A 1982-07-22 1983-07-20 A screw threaded fastener and fastened assembly Withdrawn GB2124318A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US40081182A 1982-07-22 1982-07-22

Publications (2)

Publication Number Publication Date
GB8319624D0 GB8319624D0 (en) 1983-08-24
GB2124318A true GB2124318A (en) 1984-02-15

Family

ID=23585124

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8319624A Withdrawn GB2124318A (en) 1982-07-22 1983-07-20 A screw threaded fastener and fastened assembly

Country Status (4)

Country Link
DE (1) DE3326079A1 (en)
FR (1) FR2530748B1 (en)
GB (1) GB2124318A (en)
SE (1) SE8304078L (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0129404A1 (en) * 1983-06-15 1984-12-27 ITW Limited Fixings including screws and clamp plates
GB2143297A (en) * 1983-10-01 1985-02-06 Headrate Ltd Shear resistant screw
EP0432484A2 (en) * 1989-11-16 1991-06-19 SFS Handels Holding AG Fastening element
EP1279840A1 (en) * 2001-07-25 2003-01-29 Richter-System GmbH & Co. KG Fastening screw
EP1331408A1 (en) * 2002-01-28 2003-07-30 Yugenkaisha Shinjo Seisakusho Self-drilling screw for use in steel constructions
FR2878542A1 (en) * 2004-11-29 2006-06-02 Sarl Francois Inglese Sarl Fastener for fixing insulating ring on e.g. frontage, has conical profiled skirt connected to cylindrical anchorage body by horizontal support base which enters base of concerned recess of insulating ring
WO2006102144A1 (en) * 2005-03-18 2006-09-28 Bfs Diversified Products, Llc Fastener, roofing system and method
US20090116931A1 (en) * 2007-11-07 2009-05-07 Wray Robert P Fastening devices, systems and method of installation
EP3995708A1 (en) * 2020-11-04 2022-05-11 Illinois Tool Works, Inc. Drywall screw

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3715420A1 (en) * 1987-05-08 1988-12-08 Adolf Wuerth Gmbh & Co Kg Spacer screw
DE9000761U1 (en) * 1990-01-24 1990-03-29 Itw-Ateco Gmbh, 2000 Norderstedt Self-drilling screw for fastening wooden parts to sheet metal
DE4116981A1 (en) * 1991-05-24 1992-11-26 Adolf Wuerth Gmbh & Co Kg SCREW FOR FASTENING PLASTERBOARD
DE19755953C2 (en) * 1997-12-16 2001-05-31 Sfs Ind Holding Ag Heerbrugg Screw for fixing cover plates or rails to a substructure
DE102006023025A1 (en) * 2006-05-10 2007-11-15 Swg Schraubenwerk Gaisbach Gmbh Countersunk screw, has screw thread extending over part of screw shank, and screw head with lowering sections arranged one after another in longitudinal direction of screw, where head is designed in truncated cone shape

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1270545A (en) * 1968-12-05 1972-04-12 Illinois Tool Works Screws
GB1277044A (en) * 1968-09-09 1972-06-07 Illinois Tool Works Screw-type fasteners
GB1346786A (en) * 1970-06-02 1974-02-13 Illinois Tool Works Threaded fasteners with stabilizing threads
GB1479600A (en) * 1973-11-13 1977-07-13 British Screw Co Ltd Threaded fastener and method and tool for inserting same
GB2111157A (en) * 1981-12-04 1983-06-29 Itw Ltd Improvements to screws

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2292557A (en) * 1941-09-25 1942-08-11 Wilson Wealey Wood screw
FR1099620A (en) * 1954-02-18 1955-09-07 Assembly device by unscrewable threaded member
GB1083780A (en) * 1965-10-11 1967-09-20 Illinois Tool Works Screws
FR1526136A (en) * 1967-04-07 1968-05-24 Bolt with captive nut
AT368609B (en) * 1980-10-02 1982-10-25 Sfs Stadler Ag METAL SCREW

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1277044A (en) * 1968-09-09 1972-06-07 Illinois Tool Works Screw-type fasteners
GB1270545A (en) * 1968-12-05 1972-04-12 Illinois Tool Works Screws
GB1346786A (en) * 1970-06-02 1974-02-13 Illinois Tool Works Threaded fasteners with stabilizing threads
GB1479600A (en) * 1973-11-13 1977-07-13 British Screw Co Ltd Threaded fastener and method and tool for inserting same
GB2111157A (en) * 1981-12-04 1983-06-29 Itw Ltd Improvements to screws

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0129404A1 (en) * 1983-06-15 1984-12-27 ITW Limited Fixings including screws and clamp plates
GB2143297A (en) * 1983-10-01 1985-02-06 Headrate Ltd Shear resistant screw
EP0432484A2 (en) * 1989-11-16 1991-06-19 SFS Handels Holding AG Fastening element
EP0432484A3 (en) * 1989-11-16 1991-09-11 Stadler Heerbrugg Holding Ag Fastening element
EP1279840A1 (en) * 2001-07-25 2003-01-29 Richter-System GmbH & Co. KG Fastening screw
EP1331408A1 (en) * 2002-01-28 2003-07-30 Yugenkaisha Shinjo Seisakusho Self-drilling screw for use in steel constructions
FR2878542A1 (en) * 2004-11-29 2006-06-02 Sarl Francois Inglese Sarl Fastener for fixing insulating ring on e.g. frontage, has conical profiled skirt connected to cylindrical anchorage body by horizontal support base which enters base of concerned recess of insulating ring
WO2006102144A1 (en) * 2005-03-18 2006-09-28 Bfs Diversified Products, Llc Fastener, roofing system and method
US20090116931A1 (en) * 2007-11-07 2009-05-07 Wray Robert P Fastening devices, systems and method of installation
US8419333B2 (en) * 2007-11-07 2013-04-16 Robert P. Wray Fastening devices, systems and method of installation
EP3995708A1 (en) * 2020-11-04 2022-05-11 Illinois Tool Works, Inc. Drywall screw

Also Published As

Publication number Publication date
DE3326079A1 (en) 1984-01-26
SE8304078D0 (en) 1983-07-21
FR2530748B1 (en) 1988-10-14
FR2530748A1 (en) 1984-01-27
GB8319624D0 (en) 1983-08-24
SE8304078L (en) 1984-01-23

Similar Documents

Publication Publication Date Title
US5039262A (en) Self-drilling wall anchor
US4959938A (en) Non-seating plate/fastener assembly
US5622464A (en) Screw with increased driving resistance at proper depth
US4601625A (en) Self drilling threaded insert for drywall
US5947670A (en) Self-drilling fastener
US4781503A (en) Fastener assembly for securing roofing on a soft insulation material to a solid base
EP0161837B1 (en) Anchoring element and fastening assembly including such an element
GB2124318A (en) A screw threaded fastener and fastened assembly
EP2286097B1 (en) Threaded fastener
US5066181A (en) Attachment element with large washer
US5540531A (en) Panel fastener
US4309135A (en) Concrete anchor
US5074726A (en) Blind fastener
AU724132B2 (en) Screw for fastening metal and/or plastic sections or plates to a substructure
US5118233A (en) Pre-setting and controlling the tightening of stud bolts and the like and novel stud bolts
US4543763A (en) Penetration controlling device and system
US6361259B1 (en) Screw for torque-limited fastening
US5139379A (en) Roofing fastener, improved screw therefor, and improved washer therefor
US20180156255A1 (en) Anchor fastener
US4778319A (en) Self-tapping screw
US4762450A (en) Damage resistant plastic expansion nut and screw therefor
EP0416183B1 (en) Anchor-fixing
EP0055106A1 (en) Screw-threaded fasteners
GB2064698A (en) Punching or riveting screw fastener
EP0333202A1 (en) Blind fastener

Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)