CA2225056A1 - Screw - Google Patents

Screw

Info

Publication number
CA2225056A1
CA2225056A1 CA002225056A CA2225056A CA2225056A1 CA 2225056 A1 CA2225056 A1 CA 2225056A1 CA 002225056 A CA002225056 A CA 002225056A CA 2225056 A CA2225056 A CA 2225056A CA 2225056 A1 CA2225056 A1 CA 2225056A1
Authority
CA
Canada
Prior art keywords
shank portion
flute
screw
longitudinal axis
tip
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
CA002225056A
Other languages
French (fr)
Other versions
CA2225056C (en
Inventor
Sen-Yang Chen
Chao-Tai Cheng
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 TW084216964U external-priority patent/TW296757U/en
Priority to AU71708/96A priority Critical patent/AU689729B2/en
Application filed by Individual filed Critical Individual
Priority to CA002225056A priority patent/CA2225056C/en
Publication of CA2225056A1 publication Critical patent/CA2225056A1/en
Application granted granted Critical
Publication of CA2225056C publication Critical patent/CA2225056C/en
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • 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
    • F16B25/0078—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw with a shaft of non-circular cross-section or other special geometric features of the shaft
    • 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
    • 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

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)
  • Forging (AREA)
  • Connection Of Plates (AREA)

Abstract

The shank portion of a screw has a surface formed with a screw thread throughout the length thereof and a lower section formed with a flute at the surface thereof. The flute extends from a tip of the shank portion and has a longitudinal length which is inclined with respect to a longitudinal axis of the shank portion. The flute is defined by a planar side wall, which is inclined relative to the longitudinal axis, and a curved bottom. The planar side wall has a surface with screw thread portions that are disposed in a staggered arrangement in a direction receding from a direction of screw advancing rotation. The flute has a depth which decreases gradually from the tip of the shank portion, and which has a maximum value equal to radius of the shank portion. The longitudinal length of the flute forms an angle ranging from 12° to 32.5° with the longitudinal axis. The screw further has a head portion with an annular skirt adjacent to the shank portion. The annular skirt has one side which is formed with an annular recess around the shank portion and a plurality of radial teeth in the annular recess.
CA002225056A 1995-11-25 1997-12-17 Screw Expired - Fee Related CA2225056C (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU71708/96A AU689729B2 (en) 1995-11-25 1996-11-11 Screw for fibrous boards
CA002225056A CA2225056C (en) 1995-11-25 1997-12-17 Screw

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TW084216964U TW296757U (en) 1995-11-25 1995-11-25 A thread cutting screw
CA002225056A CA2225056C (en) 1995-11-25 1997-12-17 Screw

Publications (2)

Publication Number Publication Date
CA2225056A1 true CA2225056A1 (en) 1999-06-17
CA2225056C CA2225056C (en) 2001-10-16

Family

ID=33435753

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002225056A Expired - Fee Related CA2225056C (en) 1995-11-25 1997-12-17 Screw

Country Status (2)

Country Link
AU (1) AU689729B2 (en)
CA (1) CA2225056C (en)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3866509A (en) * 1973-08-22 1975-02-18 Mite Corp Self-tapping and self-retaining, screw thread insert
DE3242926C2 (en) * 1982-11-20 1986-02-27 Schrauben Betzer GmbH + Co KG, 5880 Lüdenscheid Thread rolling screw

Also Published As

Publication number Publication date
AU7170896A (en) 1997-05-29
AU689729B2 (en) 1998-04-02
CA2225056C (en) 2001-10-16

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Legal Events

Date Code Title Description
EEER Examination request
MKLA Lapsed