US3748949A - Thread system - Google Patents

Thread system Download PDF

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Publication number
US3748949A
US3748949A US00190506A US3748949DA US3748949A US 3748949 A US3748949 A US 3748949A US 00190506 A US00190506 A US 00190506A US 3748949D A US3748949D A US 3748949DA US 3748949 A US3748949 A US 3748949A
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US
United States
Prior art keywords
thread
materials
low density
screws
threads
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.)
Expired - Lifetime
Application number
US00190506A
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English (en)
Inventor
G Dreger
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.)
Robertson Manufacturing Co Ltd
Original Assignee
Robertson Manufacturing Co Ltd
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 Robertson Manufacturing Co Ltd filed Critical Robertson Manufacturing Co Ltd
Application granted granted Critical
Publication of US3748949A publication Critical patent/US3748949A/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F16B25/0042—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
    • F16B25/0047—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 ridge being characterised by its cross-section in the plane of the shaft axis
    • 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
    • F16B25/0015—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 a soft organic material, e.g. wood or plastic

Definitions

  • This invention relates to threaded members and more particularly to screw threaded fasteners for use in low density materials.
  • low density materials is intended to include materials having a density below about 40 pounds per cubic foot and penetratable by a threaded member. Widespread use of some low density materials as a substitute for natural wood has been hindered by the inability of conventional wood screws to penetrate and hold in such materials. For example, conventional wood screws cause low density particle board materials to crumble between the screw threads and thus prevent the screw from penetrating the material properly. Some low density particle board materials such as Novaply permit conventional wood screws to be driven thereinto, but such screws do not hold well enough in that they loosen or are pulled out under too low a load to make their use practical.
  • Another object is to provide a threaded fastener usable in materials having a wide range of densities.
  • Another object is to provide a threaded fastener that can be driven without requiring a pre-drilled pilot hole.
  • Another object is to provide a threaded fastener that can be made in a single pass by rolling a blank between dies.
  • Another object is to provide a threaded fastener that does not crumble low density particle board between its threads.
  • Another object is to provide an easily manufactured, relatively inexpensive fastener that is rugged and durable.
  • a screw threaded member has sharp-edged, asymmetrical threads of increased surface area and spacing that penetrate and hold the member in materials having a wide range of densities.
  • FIG. 1 is a side view of a threaded member in accord with this invention.
  • FIG. 2 is an enlarged side view of a portion of the thread from the member shown in FIG. 1.
  • FIG. 3 is an enlarged side view of a portion of the member shown in FIG. 1.
  • FIG. 4 is a plan view taken along the line 4-4 in FIG. 3.
  • FIG. 1 shows how this invention would be applied to a wood screw 1 having a conventional round head 2 with a slot 3 facilitating driving of same, it being understood that this thread system can be used to anchor essentially any type of threaded member, such as a hearing rod having a threaded end.
  • Thread portion 4 is a single, continuous, sharp-edged, asymmetrical screw thread spiraling down the root portion 5 of fastener l and terminating at sharp pointed tip 6.
  • the thread leading angle is 30 and the trailing angle is 15. This results in an included angle at sharp edge 7 of 45 that permits thread portion 4 to bite into and hold well in materials having densities in the range of about 15 to about pounds per cubic foot.
  • the threads do not crumble or damage low density materials, and it is not necessary under most circumstances to pre-drill a pilot hole for member 1 before driving.
  • FIG. 3 shows the relationship between the depth T of thread portion 4 and the diameter R of root 5.
  • Thread depth T must always be at least 30 percent of the root diameter R and preferably is between 30 and 40 percent.
  • the thread system of this invention provides substantially more thread depth than the prior art. This results in a greater thread bearing surface area which reduces crumbling and other damage to low density materials while member 1 is being driven, as well as increasing its holding power thereafter.
  • One factor in achieving this desirable result is that relatively less material is displaced when screw 1 is driven.
  • FIG. 4 shows the relationship between thread surface area and root area for this thread system.
  • This thread system has substantially greater thread surface area than do comparable prior art systems, and this greatly increases the ability of this system to hold in low density materials.
  • This greater thread surface area results from the above relationship between threaddepth T and root diameter R, and from the specific values specified for the leading and trailing angles.
  • the distance between threads is designated D.
  • the thread spacing D be at least double the thread depth T, and
  • screw threaded members in accord with this invention are easily driven into low density materials without damaging such materials and also have substantially increased holding power when compared to conventional structures.
  • Threaded members as disclosed herein are also readily usable in high density materials, and this means that industrial users can reduce their fastener inventories.
  • these threaded members are especially suited for use in mass production operations where they are driven by power rotated tools (as contrasted with hand rotated tools).
  • the threaded members of this invention can be economically manufactured in a single pass between dies in a conventional rolling operation because the metal flows easily and fills out the sharp crested thread when the leading angle is 30 and the trailing angle is 15".
  • a screw threaded member for use with materials having a density in the range from about 15 to about pounds per cubic foot comprising a root portion of predetermined diameter, a single continuous external sharp-edged thread portion having a leading angle of 30 and a trailing angle of 15', the depth of. said thread portion being from 30 to 40 percent of the diameter of said root portion, and the spacing between threads being from 2.2 to 3 times as greatas said thread depth.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Wood Science & Technology (AREA)
  • Connection Of Plates (AREA)
  • Joining Of Building Structures In Genera (AREA)
US00190506A 1971-10-19 1971-10-19 Thread system Expired - Lifetime US3748949A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US19050671A 1971-10-19 1971-10-19

Publications (1)

Publication Number Publication Date
US3748949A true US3748949A (en) 1973-07-31

Family

ID=22701626

Family Applications (1)

Application Number Title Priority Date Filing Date
US00190506A Expired - Lifetime US3748949A (en) 1971-10-19 1971-10-19 Thread system

Country Status (7)

Country Link
US (1) US3748949A (fr)
JP (1) JPS4848857A (fr)
CA (1) CA1017979A (fr)
DE (1) DE2251115A1 (fr)
GB (1) GB1404032A (fr)
IT (1) IT966372B (fr)
SE (1) SE389545B (fr)

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3965793A (en) * 1971-12-08 1976-06-29 Keystone Consolidated Industries, Inc. Particleboard screw
EP0060441A1 (fr) * 1981-03-13 1982-09-22 Häfele KG Dispositif de connexion d'une pair de plaques de bois, de copeaux de bois et analogues, disposées perpendiculairement l'une à l'autre
US4439077A (en) * 1982-02-11 1984-03-27 Godsted Kent B Concrete screw anchor
US4527932A (en) * 1982-03-05 1985-07-09 Richard Bergner Gmbh & Co. Self-tapping screw
US4536117A (en) * 1981-11-30 1985-08-20 Mid-Continent Screw Products Company Screw fastener
US4653486A (en) * 1984-04-12 1987-03-31 Coker Tom P Fastener, particularly suited for orthopedic use
US4842467A (en) * 1984-08-24 1989-06-27 Yamashina Seiko-Sho, Ltd. Concrete screw
US4861206A (en) * 1986-11-26 1989-08-29 Tox-Dubel-Werk Richard M. Heckhausen GmbH & Co. KG Straddling plug
US5061135A (en) * 1990-08-28 1991-10-29 Research Engineering & Manufacturing, Inc. Thread tapping screw
US5114278A (en) * 1990-03-07 1992-05-19 F. M. Locotos Equipment & Design Co. Mining bolt apparatus and method
US5304024A (en) * 1991-03-18 1994-04-19 Adolf Wurth Gmbh & Co. Kg Screw, method and rolling die for the production thereof
WO1998051933A1 (fr) * 1997-05-14 1998-11-19 European Industrial Services Limited Fixation filetee, procede de fabrication connexe et estampes de laminage utilisees dans ce procede
US6113331A (en) * 1997-07-29 2000-09-05 Ejot Verbindungstechnik Gmbh & Co. Kg Self tapping screw for screwing into thermoplastics and the like
US6394726B1 (en) * 2000-05-31 2002-05-28 Illinois Tool Works Inc. Threaded fastener
US6575061B2 (en) 1999-03-08 2003-06-10 John B. Wagner Driver, fastener and forming tool
US6702537B2 (en) * 2001-01-12 2004-03-09 Illinois Tool Works Inc. High profile thread forming screw
US20040120792A1 (en) * 2002-08-14 2004-06-24 Winter David C. Pole joint screw for a basketball goal system
US20120096701A1 (en) * 2009-06-04 2012-04-26 Stefan Schachner Attachment means for connecting plane material combinations in dry construction
US20120251268A1 (en) * 2011-03-28 2012-10-04 Yu su-lan Screw
US20120257945A1 (en) * 2010-10-01 2012-10-11 Infastech Intellectual Properties Pte. Ltd. Threaded fastener
US20130039720A1 (en) * 2011-08-11 2013-02-14 Sheng-Tsai SHIH Screw
US10072691B2 (en) 2015-12-01 2018-09-11 Raimund Beck Nageltechnik Gmbh Attachment means for connecting thin-walled roof or facade panels to a substructure as well as a kit having such an attachment means and a sealing washer and a kit having such an attachment means and a sealing washer and a magazining-belt, respectively
US10247220B2 (en) 2015-02-16 2019-04-02 Kingi Oy Mounting screw

Families Citing this family (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS524966U (fr) * 1975-06-24 1977-01-13
JPS5212668A (en) * 1975-07-21 1977-01-31 Kawasaki Heavy Ind Ltd Process and apparatus for treatment of exhaust gases emitted from wet gas treatment apparatus
JPS5571809U (fr) * 1978-11-11 1980-05-17
JPS5844561B2 (ja) * 1978-12-15 1983-10-04 極東開発工業株式会社 運搬車における収容々器の蓋体開閉装置
JPS6021588B2 (ja) * 1980-02-08 1985-05-28 旭化成株式会社 新規なインド−ルの分離方法
JPS56115022U (fr) * 1980-02-05 1981-09-03
JPS5840193A (ja) * 1981-08-31 1983-03-09 Kyushu Kankyo Kanri Kyokai 汚水の浄化装置
JPS5842409U (ja) * 1981-09-16 1983-03-22 岩田ボ−ルト工業株式会社 タツピンねじ
JPS5925179A (ja) * 1982-08-03 1984-02-09 Asahi Glass Co Ltd ガス拡散電極用材料
JPS5930915U (ja) * 1982-08-23 1984-02-25 有限会社新城製作所 薄板用ドリルねじ
JPS5939310U (ja) * 1982-09-03 1984-03-13 有限会社新城製作所 薄板用ドリルねじ
JPS5945445A (ja) * 1982-09-09 1984-03-14 Toshiba Corp 電子写真感光体
JPS5959512U (ja) * 1982-10-15 1984-04-18 有限会社新城製作所 薄板用ドリルねじ
JPS60252937A (ja) * 1984-05-30 1985-12-13 Hitachi Ltd 画面入出力情報の防護装置
JPS60256199A (ja) * 1984-05-31 1985-12-17 三菱電機株式会社 音声合成装置
JPS6123513U (ja) * 1984-07-17 1986-02-12 若井産業株式会社 タツピングねじ
JPS6129116U (ja) * 1984-07-27 1986-02-21 大橋商事株式会社 タツピングスクリユ−
JPH0629604B2 (ja) * 1985-09-24 1994-04-20 若井産業株式会社 タツピングねじ
JPH0411912A (ja) * 1990-04-26 1992-01-16 Nok Corp 流体フィルタ用不織布
JPH0468212U (fr) * 1990-10-23 1992-06-17
DE4108771A1 (de) * 1991-03-18 1992-09-24 Adolf Wuerth Gmbh & Co Kg Spanplattenschraube
DE19831269C2 (de) * 1998-07-13 2000-11-30 Heicko Schraubenvertriebs Gmbh Fensterbauschraube
JP2002195229A (ja) * 2000-12-27 2002-07-10 Kita Rashi Seisakusho:Kk 瓦止めねじ
JP2005113489A (ja) * 2003-10-07 2005-04-28 Muro Corp 建築用木ネジ
JP2016114178A (ja) * 2014-12-16 2016-06-23 株式会社丸エム製作所 木ネジ
JP2018112208A (ja) * 2017-01-10 2018-07-19 株式会社カネカ 発泡体用ねじ及び発泡体用ねじを使用した構造体

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1294268A (en) * 1915-08-26 1919-02-11 Edward C Holmes Screw-spike.
US2350346A (en) * 1943-04-14 1944-06-06 Clifford R Gaskell Self-tapping screw
US2380724A (en) * 1944-01-12 1945-07-31 Lestershire Spool And Mfg Comp Wood screw
US2742074A (en) * 1951-03-09 1956-04-17 Rosan Joseph Insert and reduced diameter locking ring therefor
GB1150769A (en) * 1966-08-19 1969-04-30 Ford Motor Co Self-Tapping Screws

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1294268A (en) * 1915-08-26 1919-02-11 Edward C Holmes Screw-spike.
US2350346A (en) * 1943-04-14 1944-06-06 Clifford R Gaskell Self-tapping screw
US2380724A (en) * 1944-01-12 1945-07-31 Lestershire Spool And Mfg Comp Wood screw
US2742074A (en) * 1951-03-09 1956-04-17 Rosan Joseph Insert and reduced diameter locking ring therefor
GB1150769A (en) * 1966-08-19 1969-04-30 Ford Motor Co Self-Tapping Screws

Cited By (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3965793A (en) * 1971-12-08 1976-06-29 Keystone Consolidated Industries, Inc. Particleboard screw
EP0060441A1 (fr) * 1981-03-13 1982-09-22 Häfele KG Dispositif de connexion d'une pair de plaques de bois, de copeaux de bois et analogues, disposées perpendiculairement l'une à l'autre
US4536117A (en) * 1981-11-30 1985-08-20 Mid-Continent Screw Products Company Screw fastener
US4439077A (en) * 1982-02-11 1984-03-27 Godsted Kent B Concrete screw anchor
US4527932A (en) * 1982-03-05 1985-07-09 Richard Bergner Gmbh & Co. Self-tapping screw
US4653486A (en) * 1984-04-12 1987-03-31 Coker Tom P Fastener, particularly suited for orthopedic use
US4842467A (en) * 1984-08-24 1989-06-27 Yamashina Seiko-Sho, Ltd. Concrete screw
US4861206A (en) * 1986-11-26 1989-08-29 Tox-Dubel-Werk Richard M. Heckhausen GmbH & Co. KG Straddling plug
US5114278A (en) * 1990-03-07 1992-05-19 F. M. Locotos Equipment & Design Co. Mining bolt apparatus and method
US5061135A (en) * 1990-08-28 1991-10-29 Research Engineering & Manufacturing, Inc. Thread tapping screw
US5304024A (en) * 1991-03-18 1994-04-19 Adolf Wurth Gmbh & Co. Kg Screw, method and rolling die for the production thereof
WO1998051933A1 (fr) * 1997-05-14 1998-11-19 European Industrial Services Limited Fixation filetee, procede de fabrication connexe et estampes de laminage utilisees dans ce procede
US6113331A (en) * 1997-07-29 2000-09-05 Ejot Verbindungstechnik Gmbh & Co. Kg Self tapping screw for screwing into thermoplastics and the like
US6575061B2 (en) 1999-03-08 2003-06-10 John B. Wagner Driver, fastener and forming tool
US6394726B1 (en) * 2000-05-31 2002-05-28 Illinois Tool Works Inc. Threaded fastener
US6702537B2 (en) * 2001-01-12 2004-03-09 Illinois Tool Works Inc. High profile thread forming screw
US20040120792A1 (en) * 2002-08-14 2004-06-24 Winter David C. Pole joint screw for a basketball goal system
US6994502B2 (en) * 2002-08-14 2006-02-07 Lifetime Products, Inc. Pole joint screw for a basketball goal system
US20120096701A1 (en) * 2009-06-04 2012-04-26 Stefan Schachner Attachment means for connecting plane material combinations in dry construction
US11478886B2 (en) 2009-06-04 2022-10-25 Raimund Beck Nageltechnik Gmbh Attachment means for connecting plane material combinations in dry construction
US20120257945A1 (en) * 2010-10-01 2012-10-11 Infastech Intellectual Properties Pte. Ltd. Threaded fastener
CN102741570A (zh) * 2010-10-01 2012-10-17 盈科知识产权私人有限公司 螺纹紧固件
US9046120B2 (en) * 2010-10-01 2015-06-02 Infastech Intellectual Properties Pte. Ltd Threaded fastener
US8360702B2 (en) * 2011-03-28 2013-01-29 Yu su-lan Screw
US20120251268A1 (en) * 2011-03-28 2012-10-04 Yu su-lan Screw
US20130039720A1 (en) * 2011-08-11 2013-02-14 Sheng-Tsai SHIH Screw
US10247220B2 (en) 2015-02-16 2019-04-02 Kingi Oy Mounting screw
US10072691B2 (en) 2015-12-01 2018-09-11 Raimund Beck Nageltechnik Gmbh Attachment means for connecting thin-walled roof or facade panels to a substructure as well as a kit having such an attachment means and a sealing washer and a kit having such an attachment means and a sealing washer and a magazining-belt, respectively

Also Published As

Publication number Publication date
JPS4848857A (fr) 1973-07-10
SE389545B (sv) 1976-11-08
GB1404032A (en) 1975-08-28
IT966372B (it) 1974-02-11
DE2251115A1 (de) 1973-04-26
CA1017979A (fr) 1977-09-27

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