[go: up one dir, main page]

US3748949A - Thread system - Google Patents

Thread system Download PDF

Info

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
Authority
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
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

Links

Images

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.

Landscapes

  • 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)
  • Joining Of Building Structures In Genera (AREA)
  • Connection Of Plates (AREA)

Abstract

A threaded member capable of being driven into low density materials has a sharp thread with its leading angle substantially larger than its trailing angle.

Description

United States Patent 11 1 Dreger 1451 July 31,1973
1 1 THREAD SYSTEM [75] lnventor: Geoffrey Dreger, Oakville, Ontario,
Canada [73] Assignee: P. L. Robertson Manufacturing Company, Limited, Milton, Ontario, Canada [22] Filed: Oct. 19, 1971 [21] Appl. No.: 190,506
[52] 11.8. C1. 85/46 [51] Int. C1. F161) 25/00 [58] Field of Search 85/41, 46
[56] 1 7 References Cited UNITED STATES PATENTS 1,294,268 2/1919 Holmes 85/41 2,350,346 6 1944 065x611 85/46 2,330,724 7/1945 Crooks 85/46 2,742,074 4/1956 Rosan 85/46 FOREIGN PATENTS OR APPLICATIONS 1,150,769 4 1969 Great Britain 85/46 Primary ExaminerEdward C. Allen Attorney-Charles M. Kaplan [57] ABSTRACT A threaded member capable of being driven into low density materials has a sharp thread with its leading angle substantially larger than its trailing angle.
1 Claim, 4 Drawing Figures BACKGROUND OF THE INVENTION This invention relates to threaded members and more particularly to screw threaded fasteners for use in low density materials.
The expression 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. When an attempt is made to drive conventional wood screws into laminated materials such as natural wood veneer bonded to a thicker core of polyurethane foam of 20 pounds per cubic foot density, the screws lift the veneer from the core. The result has been that relatively expensive fasteners, or fasteners that are difficult to use, have had to be used instead of screws. Also, when an item is made from materials having vastly different densities, several different kinds of fasteners must be stocked by its manufacturer.
SUMMARY OF THE INVENTION Accordingly, it is an object of this invention to provide a threaded fastener capable of being screwed into and capable of holding well in low density materials.
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.
Still other objects and advantages of the invention will be revealed in the specification and claims, and the scope of the invention will be set forth in the claims.
Briefly stated, in accordance with one aspect of the invention 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.
DESCRIPTION OF THE DRAWING In the drawing:
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.
DESCRIPTION OF A PREFERRED EMBODIMENT 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.
As shown in FIG. 2, 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. These thread angles are critical, and the advantages of this invention will not be attained if there is any significant deviation therefrom.
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. Thus, 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 resultis 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.
In FIG. 1 the distance between threads is designated D. For threaded members in accord with this invention to perform properly, it is necessary that the thread spacing D be at least double the thread depth T, and
preferably 2.2 to 3 times the thread depth. This results in fewer threads per inch, and contributes to substantial elimination of the crumbling that occurs when prior art threads are driven into low density particle board.
Tests have been run to demonstrate the greater holding power of screws in accord with this invention. Size 10 gauge screws in accord herewith driven one-half inch into 18-20 pound per cubic foot urethane foam required a pull-out force averaging 215 pounds, while conventional type A screws of the same-size resisted an average of only 158 pounds before being pulled out of the same material. This is an improvement of about 36 percent. The same test showed these screws to be about 20 percent more resistant to pull-out from particle board materials. The same test in other materials revealed that screws in accord herewith always resisted a larger average pull-out force than did conventional types of wood screws. This shows that the holding power of fasteners with threads in accord with this invention in low density materials is substantially greater than Conventional wood screws of the same size. The tests also revealed increased holding power in materials with densities up to about 60 pounds per cubic foot. Furthermore, conventional screws showed a much greater deviation in pull-out resistance values than did the screws of the instant inventions.
It has thus been shown that 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. Also, 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".
While the present invention has been described with reference to a particular embodiment, it is not intended to illustrate or describe herein all the equivalent forms and ramifications thereof. Also, the words used are words of description rather than limitations, and various changes may be made without departing from the spirit or scope of the invention disclosed herein. it is intended that the appended claims cover all such changes as fall within the true spirit and scope of the invention.
What is claimed is:
l. 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.
i I II t l l l

Claims (1)

1. A screw threaded member for use with materials having a density in the range from about 15 to about 60 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 great as said thread depth.
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 (en)
JP (1) JPS4848857A (en)
CA (1) CA1017979A (en)
DE (1) DE2251115A1 (en)
GB (1) GB1404032A (en)
IT (1) IT966372B (en)
SE (1) SE389545B (en)

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 (en) * 1981-03-13 1982-09-22 Häfele KG Connection device for a pair of wood panels, chip boards or the like, one being perpendicular to the other
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 (en) * 1997-05-14 1998-11-19 European Industrial Services Limited Threaded fastener, method of making a threaded fastener and rolling dies for making a threaded fastener
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 (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS524966U (en) * 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 (en) * 1978-11-11 1980-05-17
JPS5844561B2 (en) * 1978-12-15 1983-10-04 極東開発工業株式会社 Lid opening/closing device for containers in transport vehicles
JPS6021588B2 (en) * 1980-02-08 1985-05-28 旭化成株式会社 A new method for separating indole
JPS56115022U (en) * 1980-02-05 1981-09-03
JPS5840193A (en) * 1981-08-31 1983-03-09 Kyushu Kankyo Kanri Kyokai Purifier for filthy water
JPS5842409U (en) * 1981-09-16 1983-03-22 岩田ボ−ルト工業株式会社 Tatsu pin screw
JPS5925179A (en) * 1982-08-03 1984-02-09 Asahi Glass Co Ltd Material for gas diffusion electrode
JPS5930915U (en) * 1982-08-23 1984-02-25 有限会社新城製作所 Drill screw for thin plate
JPS5939310U (en) * 1982-09-03 1984-03-13 有限会社新城製作所 Drill screw for thin plate
JPS5945445A (en) * 1982-09-09 1984-03-14 Toshiba Corp Electrophotographic receptor
JPS5959512U (en) * 1982-10-15 1984-04-18 有限会社新城製作所 Drill screw for thin plate
JPS60252937A (en) * 1984-05-30 1985-12-13 Hitachi Ltd Protecting device for screen input and output information
JPS60256199A (en) * 1984-05-31 1985-12-17 三菱電機株式会社 Voice synthesizer
JPS6123513U (en) * 1984-07-17 1986-02-12 若井産業株式会社 Tapping screw
JPS6129116U (en) * 1984-07-27 1986-02-21 大橋商事株式会社 Tapping screw
JPH0629604B2 (en) * 1985-09-24 1994-04-20 若井産業株式会社 Tapping screw
JPH0411912A (en) * 1990-04-26 1992-01-16 Nok Corp Nonwoven fabric for fluid filter
JPH0468212U (en) * 1990-10-23 1992-06-17
DE4108771A1 (en) * 1991-03-18 1992-09-24 Adolf Wuerth Gmbh & Co Kg CHIPBOARD SCREW
DE19831269C2 (en) * 1998-07-13 2000-11-30 Heicko Schraubenvertriebs Gmbh Window screw
JP2002195229A (en) * 2000-12-27 2002-07-10 Kita Rashi Seisakusho:Kk Roofing tile fixing screw
JP2005113489A (en) * 2003-10-07 2005-04-28 Muro Corp Architectural wood screw
JP2016114178A (en) * 2014-12-16 2016-06-23 株式会社丸エム製作所 Wood screw
JP2018112208A (en) * 2017-01-10 2018-07-19 株式会社カネカ Screw for foam and structure using screw for foam
WO2020070638A1 (en) * 2018-10-04 2020-04-09 F.Lli Mauri S.R.L. Bush with quick-screwing action

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 (en) * 1981-03-13 1982-09-22 Häfele KG Connection device for a pair of wood panels, chip boards or the like, one being perpendicular to the other
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 (en) * 1997-05-14 1998-11-19 European Industrial Services Limited Threaded fastener, method of making a threaded fastener and rolling dies for making a threaded fastener
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 (en) * 2010-10-01 2012-10-17 盈科知识产权私人有限公司 Threaded fastener
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 (en) 1973-07-10
CA1017979A (en) 1977-09-27
IT966372B (en) 1974-02-11
SE389545B (en) 1976-11-08
GB1404032A (en) 1975-08-28
DE2251115A1 (en) 1973-04-26

Similar Documents

Publication Publication Date Title
US3748949A (en) Thread system
US2833325A (en) Countersunk flexible head threaded fastener
US5199839A (en) Fastener screw having improved installation and self-locking characteristics
US3204679A (en) Fasteners for sheet material or the like
US3661046A (en) Combination screw
CA1059805A (en) Container fastener system
US3977146A (en) Fastener bushing
US3208328A (en) Screws
US3752030A (en) Screw
EP0133773A1 (en) A screw-threaded fastener
EP0357700B1 (en) Self-driving, self-tapping screw for screwing into porous concrete
US3926237A (en) Self-locking vibration-proof lock washer and cooperating threaded fastener
US3451181A (en) Honeycomb structures containing threaded inserts
US3339953A (en) Joint including t-connector
US5400845A (en) Technique for fastening logs and fastener therefor
US3472119A (en) Thread forming screw and method of making same
GB2127927A (en) Wood screws
US4015504A (en) Self-boring fastener and methods of use thereof
US5244327A (en) Trailer bed fastener
US3103962A (en) Self-locking threaded insert
US4789282A (en) Expansion anchor stud
US3079968A (en) Self-locking self-tapping sheet metal screws
US3174385A (en) Twist-off nut
US4536117A (en) Screw fastener
US3501995A (en) Thread-cutting nut