US20110064540A1 - Screw having underside cutters and pockets - Google Patents

Screw having underside cutters and pockets Download PDF

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Publication number
US20110064540A1
US20110064540A1 US12/561,931 US56193109A US2011064540A1 US 20110064540 A1 US20110064540 A1 US 20110064540A1 US 56193109 A US56193109 A US 56193109A US 2011064540 A1 US2011064540 A1 US 2011064540A1
Authority
US
United States
Prior art keywords
screw
cutters
head
shank
pockets
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.)
Abandoned
Application number
US12/561,931
Other languages
English (en)
Inventor
Mirco Walther
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
Individual
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 Individual filed Critical Individual
Priority to US12/561,931 priority Critical patent/US20110064540A1/en
Assigned to WALTHER, MIRCO, WALTHER, ULRICH, WALTHER, GERDA reassignment WALTHER, MIRCO ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: WALTHER, MIRCO
Priority to EP10816505.1A priority patent/EP2478232B1/fr
Priority to JP2012529071A priority patent/JP5779742B2/ja
Priority to CN201080041739.7A priority patent/CN102741569B/zh
Priority to PCT/CA2010/000838 priority patent/WO2011032259A1/fr
Priority to CA2773399A priority patent/CA2773399C/fr
Priority to TW099119098A priority patent/TWI557330B/zh
Publication of US20110064540A1 publication Critical patent/US20110064540A1/en
Assigned to ILLINOIS TOOL WORKS INC. reassignment ILLINOIS TOOL WORKS INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: GRK CANADA LTD.
Assigned to GRK CANADA LTD. reassignment GRK CANADA LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: WALTHER, GERDA, WALTHER, MIRCO, WALTHER, ULI
Priority to US13/440,008 priority patent/US9086088B2/en
Abandoned 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
    • F16B35/00—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws
    • F16B35/04—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws with specially-shaped head or shaft in order to fix the bolt on or in an object
    • F16B35/06—Specially-shaped heads
    • F16B35/065—Specially-shaped heads with self-countersink-cutting means
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49947—Assembling or joining by applying separate fastener

Definitions

  • the present invention relates generally to threaded fasteners and, in particular, to screws having generally flat heads.
  • a self-countersinking screw for fibrous material such as wood, wood-like materials and composite materials is disclosed in Applicant's own Canadian Patent 2,198,832 (Walther et al.) which issued Apr. 16, 2002.
  • This self-countersinking screw includes an inverted-conical head portion with a cavity adapted to receive a tip of a screwdriver and having a conical bottom having a plurality of triangular recesses each having a lateral side extending inwardly to form a sharp edge and a space for receiving chips.
  • the sharp edge is designed to create a countersink when the screw penetrates into the workpiece.
  • This self-countersinking screw can be inserted easily and efficiently.
  • the present invention provides a novel screw having cutters and one or more pockets on an underside of the screw head.
  • the cutters scrape or carve off material from the surface of the workpiece against which the head of the screw bears to thereby countersink the head.
  • the one or pockets receive material from the workpiece into which the screw is being inserted to thereby lock the screw in place. The material that enters the pockets prevents the screw from loosening.
  • one main aspect of the present invention is a screw comprising an elongated shank having a plurality of threads over at least a portion of the shank, the threads terminating in a tip at a first end of the shank.
  • the screw has a head disposed at a second end of the shank, the head having a substantially flat underside.
  • a plurality of cutters are arranged circumferentially on the underside of the head. The cutters are adapted to facilitate countersinking of the head by cutting away material from a surface of a fibrous material into which the screw is being inserted. At least one pocket is spaced radially apart from the cutters for receiving at least some of the fibrous material when the screw is inserted into the fibrous material.
  • Another main aspect of the present invention is a method of fastening a screw to a piece of fibrous material.
  • the method entails positioning a tip of the screw against a surface of the fibrous material and applying torque to the screw to cause the screw to thread into the fibrous material until cutters on an underside of a head of the screw cut away some of the fibrous material from the surface to thereby facilitate countersinking of the head of the screw into the surface of the fibrous material.
  • the torque is applied until some of the fibrous material enters one or more pockets formed in the underside of the head of the screw.
  • a further main aspect of the present invention is a threaded fastener including a shank and a head at one end of the shank.
  • the head has an underside in which are disposed a plurality of cutters for countersinking the head into a surface of fibrous material.
  • the head further includes at least one pocket disposed around the shank and disposed radially inwardly from the cutters to receive some of the fibrous material when the fastener is inserted.
  • FIG. 1 is an isometric view of the underside of the head of a novel screw in accordance with a first embodiment of the present invention
  • FIG. 2 is a top plan view of the screw of FIG. 1 ;
  • FIG. 3 is a side elevation view of the screw of FIG. 1 ;
  • FIG. 4 is a cross-sectional view of the screw of FIG. 1 , taken through section 4 - 4 ;
  • FIG. 5 is a bottom plan view of the screw of FIG. 1 ;
  • FIG. 6 is an enlarged cross-sectional view of a portion of the screw of FIG. 1 ;
  • FIG. 7 is an isometric view of the underside of the head of a novel screw in accordance with a second embodiment of the present invention.
  • FIG. 8 is a top plan view of the screw of FIG. 7 ;
  • FIG. 9 is a side elevation view of the screw of FIG. 7 ;
  • FIG. 10 is a cross-sectional view of the screw of FIG. 7 , taken through section 10 - 10 ;
  • FIG. 11 is a bottom plan view of the screw of FIG. 7 ;
  • FIG. 12 is an enlarged cross-sectional view of a portion of the screw of FIG. 7 ;
  • FIG. 13 is an isometric view of the underside of the head of a novel screw in accordance with a third embodiment of the present invention.
  • FIG. 14 is a top plan view of the screw of FIG. 13 ;
  • FIG. 15 is a side elevation view of the screw of FIG. 13 ;
  • FIG. 16 is a cross-sectional view of the screw of FIG. 13 , taken through section 16 - 16 ;
  • FIG. 17 is a bottom plan view of the screw of FIG. 13 ;
  • FIG. 18 is an enlarged cross-sectional view of a portion of the screw of FIG. 13 .
  • the present invention provides a novel screw having cutters and one or more pockets on an underside of the head of the screw.
  • the cutters scrape or carve off material from the surface to help countersink the head.
  • the pockets receive material from the workpiece into which the screw is penetrating to thereby lock the screw in place, i.e. the material extending into the pockets precludes, or at least inhibits, the screws from loosening over time.
  • FIGS. 1-18 depict three embodiments of the present invention which are presented by way of example to illustrate the invention.
  • FIGS. 1-6 depict a first embodiment of the present invention in which the screw has a plurality of cutters shaped like quadrilateral wedges and a single annular pocket disposed around the shank of the screw.
  • FIGS. 7-12 depict a second embodiment of the present invention in which the screw has a plurality of circular pockets in the underside of the head.
  • FIGS. 13-18 depict a third embodiment of the present invention in which the cutters are triangular wedges.
  • a screw generally designated by reference numeral 10 has an elongated shank 12 having a plurality of threads 14 over at least a portion of the shank, the threads terminating in a tip 16 at a first end 18 of the shank.
  • the shank (stem) may have a threaded portion and a non-threaded portion.
  • the screw also has a head 20 disposed at a second end 22 of the shank.
  • the head has a substantially flat underside 24 . Between the shank and the head may be a tapered (frusta-conical) intermediate (neck) portion as shown in the figures.
  • a plurality of cutters (cutting teeth) 26 are arranged circumferentially on the underside of the head.
  • the cutters have a sharp cutting edge that are oriented and otherwise adapted to cut away (i.e. carve off or scrape off) fibrous material (e.g. wood, composites and like products) when rotated against a surface of this type of fibrous material.
  • the cutters thereby facilitate countersinking of the head.
  • the cutters may incidentally also produce debris or chips when rotated against the surface.
  • At least one pocket 28 is spaced radially apart from the cutters for receiving some of the fibrous material when the screw penetrates into the material.
  • the pocket may be any suitable recess, hole or cavity for receiving material.
  • shards, protrusions or other elements of the fibrous material may extend or enter into the pockets. As the screw is rotated these help lock the screw.
  • some of the fibrous material at the surface may partially extrude into the pockets.
  • possibly some debris that is generated when the cutters rotate against the surface
  • Debris may help pack the fibrous material into the pockets to further secure the screw against unwanted loosening.
  • the pocket in this first embodiment is an annular recess (annular pocket) that surrounds the shank (stem) and is disposed radially inwardly of the cutters.
  • the cutters 26 are quadrilateral wedges. In one specific embodiment, there are fourteen (14) cutters although the number of cutters 26 , it should be appreciated may be varied.
  • the screw also comprises a socket 30 into which a correspondingly shaped bit of a screwdriver may be inserted to apply torque to rotate the screw.
  • a socket is depicted in the drawings; however, it should be appreciated that any type of socket may be utilized with the embodiments of this invention.
  • the screw 10 has a plurality of discrete pockets 28 instead of an annular recess (annular pocket).
  • the pockets 28 may be circular as illustrated in this second embodiment. It will be appreciated that the discrete pockets 28 may be square, rectangular, oblong, elliptical or any other suitable shape for receiving fibrous material and/or for incidentally collecting and storing debris.
  • the screw has cutters 26 shaped like triangular wedges while the circular pockets 28 are the same as those shown in the second embodiment.
  • any other suitable cutting shape may be utilized in lieu of the quadrilateral and triangular wedges depicted herein. Any suitable shape can be employed for the cutters provided they retain their function, i.e. the ability to easily and cleanly cut a countersink hole.
  • the pockets may have any suitable shape provided they are able to receive some of the material as the screw penetrates into the surface of the workpiece. By receiving some of the material into the pockets, the screw is less likely to loosen over time.
  • the screw described above and depicted in the attached drawings is designed primarily to be used with a fibrous material, e.g. wood, composites and other lignocellulosic materials.
  • the embodiments of this invention may potentially be applied to other types of fasteners and materials where the cutters countersink and the pockets receive material that locks the screw against unwanted loosening.
  • the present invention can be adapted to provide a fastener having a shank (or stem) and a head at one end of the shank, the head having an underside in which are disposed a plurality of cutters for countersinking and at least one pocket disposed around the shank and disposed radially inwardly from the cutters to receive material when the fastener is inserted. While the primary intention is to apply this technology to a screw, it could be applied in theory to other types of threaded fasteners.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Connection Of Plates (AREA)
  • Knives (AREA)
  • Details Of Rigid Or Semi-Rigid Containers (AREA)
  • Drilling Tools (AREA)
  • Crushing And Pulverization Processes (AREA)
  • Dowels (AREA)
US12/561,931 2009-09-17 2009-09-17 Screw having underside cutters and pockets Abandoned US20110064540A1 (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
US12/561,931 US20110064540A1 (en) 2009-09-17 2009-09-17 Screw having underside cutters and pockets
CA2773399A CA2773399C (fr) 2009-09-17 2010-06-04 Vis comportant des lames et poches de dessous de tete
PCT/CA2010/000838 WO2011032259A1 (fr) 2009-09-17 2010-06-04 Vis comportant des lames et poches de dessous de tête
JP2012529071A JP5779742B2 (ja) 2009-09-17 2010-06-04 座面にカッターおよびポケットを有するねじ
CN201080041739.7A CN102741569B (zh) 2009-09-17 2010-06-04 具有底面刀具和容器的螺钉
EP10816505.1A EP2478232B1 (fr) 2009-09-17 2010-06-04 Vis comportant des lames et poches de dessous de tête
TW099119098A TWI557330B (zh) 2009-09-17 2010-06-11 具有下側切具與槽件之螺釘
US13/440,008 US9086088B2 (en) 2009-09-17 2012-04-05 Screw having underside cutters and pockets

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US12/561,931 US20110064540A1 (en) 2009-09-17 2009-09-17 Screw having underside cutters and pockets

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US13/440,008 Division US9086088B2 (en) 2009-09-17 2012-04-05 Screw having underside cutters and pockets

Publications (1)

Publication Number Publication Date
US20110064540A1 true US20110064540A1 (en) 2011-03-17

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US12/561,931 Abandoned US20110064540A1 (en) 2009-09-17 2009-09-17 Screw having underside cutters and pockets
US13/440,008 Active 2030-01-18 US9086088B2 (en) 2009-09-17 2012-04-05 Screw having underside cutters and pockets

Family Applications After (1)

Application Number Title Priority Date Filing Date
US13/440,008 Active 2030-01-18 US9086088B2 (en) 2009-09-17 2012-04-05 Screw having underside cutters and pockets

Country Status (7)

Country Link
US (2) US20110064540A1 (fr)
EP (1) EP2478232B1 (fr)
JP (1) JP5779742B2 (fr)
CN (1) CN102741569B (fr)
CA (1) CA2773399C (fr)
TW (1) TWI557330B (fr)
WO (1) WO2011032259A1 (fr)

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CN103133486A (zh) * 2011-11-29 2013-06-05 苏州工业园区协诚精密五金有限公司 具有倒刺结构的螺钉
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USD828148S1 (en) * 2016-08-31 2018-09-11 Illinois Tool Works Inc. Screw fastener
US10436238B2 (en) 2016-04-04 2019-10-08 The Hillman Group, Inc. Screw type fastener
US10982703B2 (en) 2018-04-09 2021-04-20 The Hillman Group, Inc. Screw-type fastener for concrete and hurricane resistance applications
US11035399B2 (en) 2017-09-13 2021-06-15 Illinois Tool Works Inc. Threaded fastener
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US11548680B1 (en) * 2019-06-17 2023-01-10 David Brebner System and method for locking together a set of sheets of semi-rigid material
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CN102741569A (zh) 2012-10-17
WO2011032259A8 (fr) 2012-04-12
EP2478232A1 (fr) 2012-07-25
CA2773399A1 (fr) 2011-03-24
US20120186067A1 (en) 2012-07-26
EP2478232A4 (fr) 2017-05-17
EP2478232B1 (fr) 2019-08-07
WO2011032259A1 (fr) 2011-03-24
JP5779742B2 (ja) 2015-09-16
CA2773399C (fr) 2015-02-03
CN102741569B (zh) 2015-11-25
TWI557330B (zh) 2016-11-11
US9086088B2 (en) 2015-07-21
TW201111652A (en) 2011-04-01
JP2013505401A (ja) 2013-02-14

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