GB2070996A - Self-drilling, self tapping screws - Google Patents

Self-drilling, self tapping screws Download PDF

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Publication number
GB2070996A
GB2070996A GB8107152A GB8107152A GB2070996A GB 2070996 A GB2070996 A GB 2070996A GB 8107152 A GB8107152 A GB 8107152A GB 8107152 A GB8107152 A GB 8107152A GB 2070996 A GB2070996 A GB 2070996A
Authority
GB
United Kingdom
Prior art keywords
self
segment
drilling
tapping screw
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.)
Granted
Application number
GB8107152A
Other versions
GB2070996B (en
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 GB2070996A publication Critical patent/GB2070996A/en
Application granted granted Critical
Publication of GB2070996B publication Critical patent/GB2070996B/en
Expired legal-status Critical Current

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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)
  • Earth Drilling (AREA)
  • Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)
  • Connection Of Plates (AREA)
  • Drilling Tools (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. <IMAGE>

Description

SPECIFICATION Self-drilling, self-tapping screws The present invention comprises improved self-drililing, self-tapping 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.
The drill point includes two conical segments with flat sides and rounded tips. The segments are longitudinally offset along the axis of the screw with respect to one another and the flat sides are coplanar. The two angles included by the conical segments may be different, with the angle of the segment nearer the head end preferably 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 wallboard or other panel material to steel studs. A selfdrilling, 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 resuits in higher pullout values (i.e.
greater holding power) for the screw. The embodiment utilizing the quad-iead 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 Fig. 1; Figure 3 is a cross section taken along line 3-3 in Fig. 2; Figure 4 is an enlarged fragmentary top view of the drill tip of Figs. 1 to 3; Figure 5 is an enlarged side elevational view in partial section of a second embodiment; Figure 6 is a cross section taken along line 6-6 in Fig. 5; and Figure 7 is a top elevational view of the drill tip of Figs. 5 and 6.
The head 1 2 of the screw 10 shown in Fig.
1 has the same general configuration as is shown in U.S. Patent 3056234. This head style has proved to be particularly well suited for retention in wallboard or the like. A recess 14 provides a plurality of drive-engageable surfaces for rotationally driving the screw.
A threaded region 1 6 comprises a quadlead thread configuration including two threads 1 8 having a first crest diameter and two threads 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 second segment 26 is longitudinally offset with respect to the first conical segment 24 towards the head 1 2. 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 segments 24 and 26 creats two flute areas 32. Due to the symmetry 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 quad-lead helps to further increase the holding strength due to the increased thread density.
A second embodiment is depicted in Figs. 5 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 Figs. 1 to 4, the flat sides of the segments in Figs. 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 1 6 of this embodiment is shown with a type B thread 1 9 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 Figs.
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 segment being at a first longitudinal position along the screw length, and a second conical segment with a fiat side and a rounded tip, said segment being at a second longitudinal position along the screw length, said second longitudinal position being nearer the head then said first position, and the two flat sides being coplanar.
2. The self-drilling, self-tapping screw of Claim 1, wherein 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 than the included angle of said first segment.
4. The self-drilling, self-tapping screw of any of claims 1 to 3, wherein 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 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, substantiaily as described with reference to Figs. 1 to 4, or Figs. 5 to 7 of the accompanying drawings.
GB8107152A 1980-03-07 1981-03-06 Self-drilling self-tapping screws Expired GB2070996B (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
GB2070996A true GB2070996A (en) 1981-09-16
GB2070996B GB2070996B (en) 1984-01-04

Family

ID=22434207

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8107152A Expired GB2070996B (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)

Cited By (10)

* 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
EP0121108A1 (en) * 1983-03-07 1984-10-10 Richard C. Laverty Self-drilling and self-extruding screw
WO1985005415A1 (en) * 1984-05-23 1985-12-05 Anders Sahlin Wood screw
US4655661A (en) * 1983-12-23 1987-04-07 Richter-System Gmbh & Co. Kg Self-cutting fast construction screw
US5569009A (en) * 1992-11-26 1996-10-29 Kabushiki Kaisha Suzuki Rashi Seisakusho Loosening prevention screw
EP0878631A1 (en) * 1997-05-12 1998-11-18 Illinois Tool Works Inc. Fastener
US7040850B2 (en) * 2003-08-04 2006-05-09 Power Products Iii, L.L.C. Fastener for use with frangible material
WO2009091857A1 (en) * 2008-01-18 2009-07-23 Illinois Tool Works Inc. Universal fastener
US20150289916A1 (en) * 2014-04-15 2015-10-15 Chester H. Sharps Bone screws having more than three leads
CN111194188A (en) * 2017-10-09 2020-05-22 康曼德公司 Easy-to-start hollow bone screw

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH682174A5 (en) * 1990-06-23 1993-07-30 Mungo Befestigungstech Ag

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
DE2913482A1 (en) * 1979-04-04 1980-10-16 Frank Knoche Self-drilling screw design - has non-round tip offset from centre line of shank

Cited By (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
EP0121108A1 (en) * 1983-03-07 1984-10-10 Richard C. Laverty Self-drilling and self-extruding screw
US4655661A (en) * 1983-12-23 1987-04-07 Richter-System Gmbh & Co. Kg Self-cutting fast construction screw
WO1985005415A1 (en) * 1984-05-23 1985-12-05 Anders Sahlin Wood screw
US5569009A (en) * 1992-11-26 1996-10-29 Kabushiki Kaisha Suzuki Rashi Seisakusho Loosening prevention screw
EP0878631A1 (en) * 1997-05-12 1998-11-18 Illinois Tool Works Inc. Fastener
US7040850B2 (en) * 2003-08-04 2006-05-09 Power Products Iii, L.L.C. Fastener for use with frangible material
WO2009091857A1 (en) * 2008-01-18 2009-07-23 Illinois Tool Works Inc. Universal fastener
AU2009206120B2 (en) * 2008-01-18 2012-09-13 Illinois Tool Works Inc. Universal fastener
US20150289916A1 (en) * 2014-04-15 2015-10-15 Chester H. Sharps Bone screws having more than three leads
CN111194188A (en) * 2017-10-09 2020-05-22 康曼德公司 Easy-to-start hollow bone screw

Also Published As

Publication number Publication date
AU543900B2 (en) 1985-05-09
FR2477649B1 (en) 1985-12-06
BR8101270A (en) 1981-09-08
IT8120125A0 (en) 1981-03-04
FR2477649A1 (en) 1981-09-11
IE810488L (en) 1981-09-07
IT1137407B (en) 1986-09-10
AU6763781A (en) 1981-09-10
JPH0223725B2 (en) 1990-05-25
CA1142000A (en) 1983-03-01
DE3108010A1 (en) 1982-01-07
ZA811222B (en) 1982-09-29
IE51170B1 (en) 1986-10-29
GB2070996B (en) 1984-01-04
MX151872A (en) 1985-04-15
JPS56134613A (en) 1981-10-21

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19940306