IE51170B1 - Self-drilling,self-tapping screws - Google Patents

Self-drilling,self-tapping screws

Info

Publication number
IE51170B1
IE51170B1 IE488/81A IE48881A IE51170B1 IE 51170 B1 IE51170 B1 IE 51170B1 IE 488/81 A IE488/81 A IE 488/81A IE 48881 A IE48881 A IE 48881A IE 51170 B1 IE51170 B1 IE 51170B1
Authority
IE
Ireland
Prior art keywords
self
drilling
segment
tapping screw
screw
Prior art date
Application number
IE488/81A
Other versions
IE810488L (en
Original Assignee
Illinois Tool Works
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 filed Critical Illinois Tool Works
Publication of IE810488L publication Critical patent/IE810488L/en
Publication of IE51170B1 publication Critical patent/IE51170B1/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
    • 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
    • F16B25/0084—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 geometric details of the tip
    • 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
    • F16B25/0068—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 with multiple-threads, e.g. a double thread screws
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Joining Of Building Structures In Genera (AREA)
  • Dowels (AREA)
  • Connection Of Plates (AREA)
  • Drilling Tools (AREA)
  • Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)
  • Earth Drilling (AREA)

Abstract

A self-drilling, self-tapping screw has a drill tip formed by a pair of conical segments 24, 26. Each segment has a flat side and a rounded tip with one segment being longitudinally off set with respect to the other. The shorter segment 26 may have a greater inclined angle. The flat side of the second segment is coplanar with the flat side of the first segment. The screw preferably includes a quad-lead thread 18, 20 having two crests with a first diameter and two crests with a second larger diameter. Other threads may be used.

Description

The present invention relates to improved self-drilling, selftapping screws comprising a head with drive-engageable surfaces at one end; a drill point at the opposite end; and a threaded region intermediate said two ends.
In such screws according to the present invention, the drill point includes a first conical segment with a flat side and a rounded tip, said first tip being at a first longitudinal position along the screw length, and a second conical segment with a flat side and a rounded tip, said second tip being at a second longitudinal position along the screw length, said second longitudinal position being nearer the head than said first position, and the two flat sides being coplanar.
The first and second tips are thus longitudinally offset along the axis of the screw with respect to one another. A necessary accompaniment of the offset of the tips is that the two conical segments do not coincide with one another longitudinally of the screw.
The two angles includes by the conical segments may be different, with the angle of the segment nearer the head end perferably being the larger of the two. The self-tapping thread may take any of several forms; it may be a machine thread, a type B thread, or a quad-lead thread having two threads with a first crest diameter and two threads with a second, larger crest diameter.
The screws of the present invention are particularly suitable for fastening wall board or other panel material to steel studs. A self-drilling, self-tapping screw of the present invention has shown itself to be a faster driller than other drill screws, requires less complicated manufacturing steps and tooling to make and, therefore, can be manufactured more economically. Further, the conical segment positioned nearer the head extrudes the relatively thin metal of the stud during drilling, providing greater thread engagement with the screw. This greater thread engagement results in higher pullout values (i.e. greater holding power) for the screw. The embodiment utilizing the quad-lead thread can be utilized to further increase thread engagement due to its increased thread density. Although particularly adapted for steel studs, the screws of the present invention can be utilized in wood applications without the need for modifying configuration.
These and other features, objects and advantages of the present invention will become more apparent through reading the following description of two embodiments of the invention, in conjunction with the accompanying drawings. In these drawings:Figure 1 is a top elevational view of a first embodiment; Figure 2 is an enlarged side elevational view in partial section of the tip region of the screw of Figure 1; Figure 3 is a cross section taken along line 3-3 in Figure 2; Figure 4 is an enlarged fragmentary top view of the drill tip of Figures 1 to 3; Figure 5 is an enlarged side elevational view in partial section of a second embodiment; - 4 Figure 6 is a cross-section taken along line 6-6 in Figure 5; and Figure 7 is a top elevational view of the drill tip of Figures 5 and 6.
The head 12 of the screw 1U shown in Figure 1 has the same general configuration as is shown in U.S. Patent 3 056 234. This head style has proved to be particularly well suited for retention in wallboard or the like. A recess 14 provides a plurality of driveengageable surfaces for rotationally driving the screw.
A threaded region 16 comprises a quad-lead thread configuration including two threads 18 having a first crest diameter and two threads 20 having a second, larger crest diameter. The drill tip shown generally at 22 comprises a first conical segment 24 and a second conical segment 26. Each segment has a flat side and a rounded tip 28, 30 respectively. The tip 30 is longitudinally offset with respect to the tip 28 towards the head 12. The conical segment 26 has a larger included angle to make up for its shorter length. The flat sides of the two segments are coplanar.
The offset between tips 30 and 28 creates two flute areas 32. Due to the symnetry of the drill tip, it is capable of drilling by rotation of the screw in either direction. This drill tip can, therefore be incorporated on a screw employing a left hand thread without any modification of its configuration, As the drill tip 22 enters a steel stud, the second conical segment 26 engages the material and works it, extruding it out of the back of the hole being formed. This extrusion increases the surface area of the aperture which is available for thread engagement by threaded region 16. The greater the thread engagement, the larger the pullout value, or holding strength, of the screw. The - 5 quad-lead helps to further increase the holding strength due to the increased thread density.
A second embodiment is depicted in Figures b to 7. in this embodiment, the difference between included angles of conical segments 26 and 24 is less than in the previous embodiment. Further, whereas the flat side of each segment lay generally along the axis of the respective segment in Figures 1 to 4, the flat sides of the segments in Figures 5 to 7 are off the axis of the respective segment, so that each conical segment comprises less than one half of a cone. Thus the point has a flattened shape. The threaded region 16 of this embodiment is shown with a type B thread 19 but it can have a machine thread or any other thread form which may be convenient.
The self-drilling, self-tapping screws shown can penetrate wallboard or the like and drill into and fasten into a steel stud. Due to the configuration of the drill tip, especially in Figures 5 to 7, the flutes will not become packed with particles of wallboard, which can have a detrimental effect on screws of other configurations. Further, the drill tip extrudes the material of the stud as it drills, thereby increasing the available material thickness for thread engagement.
Lastly, the screws are equally well suited for use with wooden studs and need not be limited to steel stud applications.

Claims (8)

1. A self-drilling, self-tapping screw comprising a head with drive-engageable surfaces at one end; a drill point at the opposite end; and a threaded region intermediate said two ends; said drill point including a first conical segment with a flat side and a rounded tip, said first tip being at a first longitudinal position along the screw length, and a second conical segment with a flat side and a rounded tip, said second tip being at a second longitudinal position along the screw length, said second longitudinal position being nearer the head than said first position, and the two flat sides being coplanar.
2. The self-drilling, self-tapping screw of claim 1, v/herein the second conical segment has an included angle different from that of said first segment.
3. The self-drilling, self-tapping screw of claim 2, wherein the included angle of said second conical segment is greater that the included angle of said first segment.
4. The self-drilling, self-tapping screw of any of claims 1 to 3, vzherein the threaded region of said screw includes at least one helical thread having a first predetermined crest diameter and at least one helical thread having a second predetermined crest diameter larger than said first diameter.
5. The self-drilling, self-tapping screw of claim 4, wherein said threaded region includes two threads having the first crest diameter and two threads having the second crest diameter.
6. The self-drilling, self-tapping screw of any of claims 1 to 5, wherein the flat side of each conical segment lies along the axis of the respective segment, so that each conical segment comprises generally one half of a cone.
7. The self-drilling, self-tapping screw of any of claims 1 to 5, wherein the flat side of each conical segment lies off the axis of the 5 respective segment, so that each conical segment comprises less than one half of a cone.
8. The self-drilling, self-tapping screw of claim 1, substantially as described with reference to Figures 1 to 4, or Figures 5 to 7 of the accompanying drawings.
IE488/81A 1980-03-07 1981-03-06 Self-drilling,self-tapping screws IE51170B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US12821180A 1980-03-07 1980-03-07

Publications (2)

Publication Number Publication Date
IE810488L IE810488L (en) 1981-09-07
IE51170B1 true IE51170B1 (en) 1986-10-29

Family

ID=22434207

Family Applications (1)

Application Number Title Priority Date Filing Date
IE488/81A IE51170B1 (en) 1980-03-07 1981-03-06 Self-drilling,self-tapping screws

Country Status (11)

Country Link
JP (1) JPS56134613A (en)
AU (1) AU543900B2 (en)
BR (1) BR8101270A (en)
CA (1) CA1142000A (en)
DE (1) DE3108010A1 (en)
FR (1) FR2477649B1 (en)
GB (1) GB2070996B (en)
IE (1) IE51170B1 (en)
IT (1) IT1137407B (en)
MX (1) MX151872A (en)
ZA (1) ZA811222B (en)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4439077A (en) * 1982-02-11 1984-03-27 Godsted Kent B Concrete screw anchor
JPS59164410A (en) * 1983-03-07 1984-09-17 インテリア・フアスナ−ズ・インコ−ポレイテツド Screw tool
DE3346704A1 (en) * 1983-12-23 1985-07-04 Richter-System GmbH & Co KG, 6103 Griesheim SELF-TAPING QUICK-SCREW SCREW
SE442047B (en) * 1984-05-23 1985-11-25 Anders Sahlin TRESKRUV
CH682174A5 (en) * 1990-06-23 1993-07-30 Mungo Befestigungstech Ag
JP3245464B2 (en) * 1992-11-26 2002-01-15 株式会社スズキ螺子製作所 Loosening prevention screw
US5779417A (en) * 1997-05-12 1998-07-14 Illinois Tool Works Inc. Fastener having primary and secondary threads
US7040850B2 (en) * 2003-08-04 2006-05-09 Power Products Iii, L.L.C. Fastener for use with frangible material
US20090185880A1 (en) * 2008-01-18 2009-07-23 Yongping Gong Universal fastener
US20150289916A1 (en) * 2014-04-15 2015-10-15 Chester H. Sharps Bone screws having more than three leads
US11490938B2 (en) * 2017-10-09 2022-11-08 Conmed Corporation Easy start cannulated bone screw

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3093028A (en) * 1959-02-05 1963-06-11 Eaton Mfg Co Self-drilling and self-tapping threaded fastener
DE1400842A1 (en) * 1961-12-01 1969-02-13 Jllinois Tool Works Inc screw
US3207024A (en) * 1962-08-20 1965-09-21 Illinois Tool Works Drill point screw
US3438299A (en) * 1968-01-26 1969-04-15 Illinois Tool Works Extruding screw
NO125290B (en) * 1968-10-23 1972-08-14 Bultfabriks Ab
DE7909735U1 (en) * 1979-04-04 1979-11-22 Knoche, Frank, 5758 Froendenberg Self-drilling screw

Also Published As

Publication number Publication date
FR2477649B1 (en) 1985-12-06
MX151872A (en) 1985-04-15
IT1137407B (en) 1986-09-10
DE3108010A1 (en) 1982-01-07
GB2070996B (en) 1984-01-04
CA1142000A (en) 1983-03-01
AU6763781A (en) 1981-09-10
JPH0223725B2 (en) 1990-05-25
FR2477649A1 (en) 1981-09-11
JPS56134613A (en) 1981-10-21
IE810488L (en) 1981-09-07
ZA811222B (en) 1982-09-29
IT8120125A0 (en) 1981-03-04
AU543900B2 (en) 1985-05-09
BR8101270A (en) 1981-09-08
GB2070996A (en) 1981-09-16

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