CA2267572A1 - Screw for use as a fastener in fibrous material such as wood - Google Patents

Screw for use as a fastener in fibrous material such as wood Download PDF

Info

Publication number
CA2267572A1
CA2267572A1 CA 2267572 CA2267572A CA2267572A1 CA 2267572 A1 CA2267572 A1 CA 2267572A1 CA 2267572 CA2267572 CA 2267572 CA 2267572 A CA2267572 A CA 2267572A CA 2267572 A1 CA2267572 A1 CA 2267572A1
Authority
CA
Canada
Prior art keywords
screw
thread
cutouts
wood
convolute
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
CA 2267572
Other languages
French (fr)
Other versions
CA2267572C (en
Inventor
Uli Walther
Mirco Walther
Thorsten 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.)
Individual
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
Priority claimed from CA002234040A external-priority patent/CA2234040A1/en
Application filed by Individual filed Critical Individual
Priority to CA 2267572 priority Critical patent/CA2267572C/en
Publication of CA2267572A1 publication Critical patent/CA2267572A1/en
Application granted granted Critical
Publication of CA2267572C publication Critical patent/CA2267572C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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
    • 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
    • F16B35/041—Specially-shaped shafts
    • F16B35/048—Specially-shaped necks
    • 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
    • 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
    • F16B25/0052—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 having indentations, notches or the like in order to improve the cutting behaviour

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)
  • Connection Of Plates (AREA)

Abstract

The thread (15) of a wood or the like screw has pairs of V-shaped recesses (22, 23) in the edge of a selected intermediate length of the thread (17). Each pair defines a W-shaped cutout (19, 20, 11). The cutouts (19-21) extend into only a part of radial width of the thread (15). There are only about three cutouts (19-21) at each convolute (17) of the limited length. The lengths of the thread (16) at the tip and at the head (13) of the screw are smooth.
Each cutout defines a cutting tooth (24) which facilitates the driving of the screw into the workpiece. The recesses 22, 23 provide cavities for fibrous debris generated by the respective tooth (24). When the screw is in place, the teeth (24) are resiliently pressed axially toward the thread produced in the workpiece to reduce the loosening tendency of the installed screw. The disposition and size of the cutouts (19-21), is about three cutouts per one convolute so as not to unduly impede the torque strength of the screw.
CA 2267572 1998-04-03 1999-03-29 Screw for use as a fastener in fibrous material such as wood Expired - Lifetime CA2267572C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CA 2267572 CA2267572C (en) 1998-04-03 1999-03-29 Screw for use as a fastener in fibrous material such as wood

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CA002234040A CA2234040A1 (en) 1998-04-03 1998-04-03 Screw for use as a fastener in fibrous material such as wood
CA2,234,040 1998-04-03
CA 2267572 CA2267572C (en) 1998-04-03 1999-03-29 Screw for use as a fastener in fibrous material such as wood

Publications (2)

Publication Number Publication Date
CA2267572A1 true CA2267572A1 (en) 1999-10-03
CA2267572C CA2267572C (en) 2003-05-27

Family

ID=25680120

Family Applications (1)

Application Number Title Priority Date Filing Date
CA 2267572 Expired - Lifetime CA2267572C (en) 1998-04-03 1999-03-29 Screw for use as a fastener in fibrous material such as wood

Country Status (1)

Country Link
CA (1) CA2267572C (en)

Also Published As

Publication number Publication date
CA2267572C (en) 2003-05-27

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Legal Events

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EEER Examination request
MKEX Expiry

Effective date: 20190329