NZ758313B2 - Screw element - Google Patents

Screw element

Info

Publication number
NZ758313B2
NZ758313B2 NZ758313A NZ75831318A NZ758313B2 NZ 758313 B2 NZ758313 B2 NZ 758313B2 NZ 758313 A NZ758313 A NZ 758313A NZ 75831318 A NZ75831318 A NZ 75831318A NZ 758313 B2 NZ758313 B2 NZ 758313B2
Authority
NZ
New Zealand
Prior art keywords
screw
section
tip
diameter
polygonal
Prior art date
Application number
NZ758313A
Other versions
NZ758313A (en
Inventor
Frank Langewiesche
Original Assignee
Spax International Gmbh & Co Kg
Filing date
Publication date
Priority claimed from EP17170965.2A external-priority patent/EP3404273B1/en
Application filed by Spax International Gmbh & Co Kg filed Critical Spax International Gmbh & Co Kg
Publication of NZ758313A publication Critical patent/NZ758313A/en
Publication of NZ758313B2 publication Critical patent/NZ758313B2/en

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
    • 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
    • F16B25/0036—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw
    • F16B25/0084—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 geometric details of the tip
    • 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
    • F16B25/106—Screws performing an additional function to thread-forming, e.g. drill screws or self-piercing screws by means of a self-piercing screw-point, i.e. without removing material

Abstract

Prior art problems include failure of the screw element in the area of its tip. The present invention relates to a screw element (1), comprising a threaded shank (2) and a screw tip (4) formed at one shank end and a screw head (5) which is formed at the opposite shank end and has a force-engagement means (7) and with a screw thread (12) running onto the threaded shank (2) and the screw tip (4). The screw tip (4) here has a front tip portion (4a), as seen in the screwing-in direction (Z), tapering towards the screw element end, and a portion (4b) which is formed on the threaded shank and has, as seen in cross section, a polygonal cross section, the envelope circle diameter (dh) of which is greater than a core diameter (dk) of the screw tip (4), and the polygonal cross section has a corner point (15) which lies on the envelope circle of the portion (4b) and in which an end edge surface (9) which is directed radially with respect to a longitudinal centre axis (X-X) with the effect of increasing the diameter ends. The screw tip (4) has a first, tapering tip portion (4a) with a circular cross section and a second, cylindrical tip portion (4c) which is formed between the first tip portion (4a) and the polygonal portion (4b) and has a circular cross section, wherein the screw thread (12) is formed continuously over the first and second tip portions (4a, 4c) of the screw tip (4) without interruption. The core diameter (dk) of the cylindrical second tip section (4c) is smaller at its base in the transition between the second tip portion (4c) and the polygonal section (4b) than the maximum core diameter (ds) of the threaded shank (2).

Claims (20)

Claims
1. Screw element comprising a threaded shaft, a screw tip formed on one shaft end and a screw head, formed on an opposite shaft end and with force application means, and comprising a screw thread extending on the threaded shaft and on the screw tip, wherein the screw tip has a front tip section tapering toward the screw element end, when viewed in the screwing-in direction (Z), and a section formed on the threaded shaft with a polygonal cross section, when viewed in cross section, whose enveloping circle diameter (dh) is greater than a core diameter (dk) of the screw tip, and the nal cross section has a corner point lying on the enveloping circle of the section, and a front edge surface, radially oriented with respect to a longitudinal center axis (X-X), ends in said corner point in the sense of an sed diameter, wherein the screw tip has a first tapering tip section with a circular cross section and a , cylindrical tip section with a circular cross section formed between the first tip section and the polygonal n, n the screw thread is uously formed without uption across the first and second tip sections of the screw tip.
2. Screw element according to claim 1, wherein the tip length (L) of the screw tip is 1.0 to 2.0 times the pitch of the screw thread, in particular of the screw thread extending on the screw tip.
3. Screw element ing to claim 1, wherein the tip length (L) of the screw tip is greater than 1.5 times and less than or equal to 2.0 times the pitch of the screw thread.
4. Screw element according to any one of claims 1 to 3, wherein a diameter dk of the second cylindrical tip section is 40% to 60% of the core diameter (ds) of the threaded shaft.
5. Screw element according to claim 4, wherein the diameter dk of the second cylindrical tip section is 50% of the core diameter (ds) of the threaded shaft.
6. Screw element according to any one of claims 1 to 5, n the inner angle of the tapering first tip section is 20º to 40º, or 30º.
7. Screw element according to any one of claims 1 to 6, wherein the core diameter (ds) of the threaded shaft is 55% to 70% of the screw nominal diameter (dg), optionally 60% to 65%.
8. Screw element according to any one of claims 1 to 7, wherein the pitch of the screw thread is 40% to 70% of the nominal er (dg), and is preferably 40% to 45% or 60% to 65% of the nominal diameter (dg) for thread lengths greater than or equal to 4 times the nominal diameter (dg), and is preferably 40% to 50% of the nominal er (dg) for thread lengths less than 4 times the nominal diameter (dg).
9. Screw element according to any one of claims 1 to 8, n the enveloping circle of the polygonal section has a diameter (dh) which is greater than or equal to a maximum core diameter (ds) of the threaded shaft which is preferably circular in cross section.
10. Screw element according to any one of claims 1 to 9, wherein the enveloping circle diameter (dh) of the polygonal section of the screw shaft is constant across its axial length.
11. Screw element according to any one of claims 1 to 10, n the polygonal n has an enveloping circle diameter (dh1) at the transition to the second tip section that is smaller than the enveloping circle diameter (dh2) at the end of the nal section facing the threaded shaft.
12. Screw element according to any one of claims 1 to 11, wherein the core diameter (dk) of the second cylindrical tip section at its base surface is r at the transition to the polygonal section than the in particular maximum core diameter (ds) of the threaded shaft.
13. Screw element according to any one of claims 1 to 12, wherein the screw thread has the nominal diameter (dg) in the area of the polygonal section and in the ing shaft section, which diameter is greater than the maximum enveloping circle diameter (dh) in the area of the polygonal section.
14. Screw element according to any one of claims 1 to 13, wherein the thread outer diameter at the screw tip increases from the screw element end from 0 to the nominal diameter (dg) on the polygonal section.
15. Screw element according to any one of claims 1 to 14, wherein the polygonal cross n of the polygonal section has at least three, preferably four corner points which lie on the ping circle of the polygonal section.
16. Screw element according to claim 15, wherein the four corner points intersect on two orthogonally ht lines (g1, g2) of the nal cross section intersecting in the center longitudinal axis (X-X) and each is the same distance (b) from the longitudinal axis (XX
17. Screw element according to claim 15 or 16, wherein the four corner points of the polygonal cross section of the polygonal section are each arranged one after the other on ht lines extending parallel to center longitudinal axis (X-X) in the longitudinal direction, so that straight core edges are formed.
18. Screw element according to claim 16 or 17, wherein the corner points of the polygonal cross section are connected by core sides, which have a concave configuration in such a way that a polygonal cross section is formed that is configured with mirror symmetry to the straight lines (g1, g2) extending orthogonally h the corner points.
19. Screw t according to claim 16 or 17, n the core sides, which connect the corner points of the polygonal section, are designed as asymmetrical with respect to the straight lines (g1, g2) extending orthogonally through the corner points in such a way that an increased cutting or milling effect is achieved in the screw-in direction (D) or in the unscrewing direction (D) of a screw element according to the invention.
20. Screw element according to any one of claims 1 to 19, n the thread has an outer thread edge which extends in a spiral shape in the axial direction, when viewed in the direction of the center longitudinal axis (X-X), and has a constant radius in the area of the threaded shaft and has a continuously decreasing radius in a spiral shape in the area of the screw tip.
NZ758313A 2018-05-08 Screw element NZ758313B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP17170965.2A EP3404273B1 (en) 2017-05-15 2017-05-15 Screw element
PCT/EP2018/061888 WO2018210637A1 (en) 2017-05-15 2018-05-08 Screw element

Publications (2)

Publication Number Publication Date
NZ758313A NZ758313A (en) 2024-01-26
NZ758313B2 true NZ758313B2 (en) 2024-04-30

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