DE1400911A1 - screw - Google Patents

screw

Info

Publication number
DE1400911A1
DE1400911A1 DENDAT1400911 DE1400911A DE1400911A1 DE 1400911 A1 DE1400911 A1 DE 1400911A1 DE NDAT1400911 DENDAT1400911 DE NDAT1400911 DE 1400911 A DE1400911 A DE 1400911A DE 1400911 A1 DE1400911 A1 DE 1400911A1
Authority
DE
Germany
Prior art keywords
screw
thread
wood
axis
bore
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.)
Pending
Application number
DENDAT1400911
Other languages
German (de)
Inventor
Ottaviano Traniello
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.)
Publication date
Publication of DE1400911A1 publication Critical patent/DE1400911A1/en
Pending legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16BDEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B25/00Screws that cut thread in the body into which they are screwed, e.g. wood screws
    • F16B25/0036Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw
    • F16B25/0084Screws 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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16BDEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B15/00Nails; Staples
    • F16B15/06Nails; Staples with barbs, e.g. for metal parts; Drive screws
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16BDEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B25/00Screws that cut thread in the body into which they are screwed, e.g. wood screws
    • F16B25/001Screws 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
    • F16B25/0015Screws 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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16BDEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B25/00Screws that cut thread in the body into which they are screwed, e.g. wood screws
    • F16B25/0036Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw
    • F16B25/0042Screws 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
    • F16B25/0068Screws 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 with multiple-threads, e.g. a double thread screws
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16BDEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B25/00Screws that cut thread in the body into which they are screwed, e.g. wood screws
    • F16B25/10Screws performing an additional function to thread-forming, e.g. drill screws or self-piercing screws
    • F16B25/106Screws 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

Description

Schruube Die erfindung betrifft eine Holzsohraube zum Eintreiben mit Hammer und anschließendem Anziehen mit Schraubenzicher oder -achlüssal. sie erfindungeßßmtLße Jchraube bezweckt, das ,eintreiben von :3ehrauben in Holz und finderas '.ratcrial @hriliohor Jiehta zu erleichtern und zu beschleunigen. Die erfindungsgemasse schraube weist folgende Hauptmerkmale auf : .Ein ein- oder mehrgänkic;es , ohraubengevrinde mit k:#n stanter Ganghöhe* -welches axial eindringen kann unti.aadurch ge- kennzeichnet ist, daß aoin"l j_eindeauuroarsnt ein 'ra,jez ist, dessen Vorderseite schräg und unter einem udhr spitzen '.inkel gegenüber der ,.jchrauben achse verläuft, dcaUen Aur'jen# geite auf der iiüllfl;@iche der -ctiraube liegt, und. deaaen Hinterseite im wesentlichen senkrecht zur schraubunachse verläuft oder geringfügig zur schraube hin nach vorn geneigt ist. Als rortsetzung des =*ctiraubenkox,nee eine starke, gewindelose :;13itze :iit vier ::cchiirfe einen Nagels, welche die @ietiraube beim l"ir=treiben ft:hrt und die Ausrichtung der Schraubenachoe erleichtert., Der Schraubenkopf und vder hintere gewindelose Schaftteil lassen sich in Grunde ähnlieh ausbilden wie die entsprcehenden Teile bekannter chrauben verschiedenster Gestalt. eitere Einzelheiten und Merkmale der Erfinung ergeben sich aus der nachfolgenden Beschreibung und der beigefügten Zeichnung, in der zwei bevorzugte Ausführungsformen für verschiedene Anwendungen beispielcweise veranschaulicht oind. In vier :elchnung zeigens Fig. 1 effne Ansicht einer mittellangen schraube für holz von mittlerer Diehte, Fig. 2 einen vergrößerten Querschnitt des halben Mittelteiles der Scohraube der Fig. 1, Fig. 3 eine Ansicht einer etärkeren Schraube mit zweigängigem Gewinde für sehr dichtes Holz, Beton, Kunststoff o.dgl., wobei die zwei Gewindegänge ein korrekteren Eindringen der schraube sicherstellen, da alle Längsabschnitte der Schraube eymmetrisoh zur Seohraubenaohse verlaufen und Fig. 4 einen vergrößerten Querschnitt des halben Gewindeteiles der Schraube der Fig. 3. In der Zeichnung bezeichnet: den Schraubenkopf, b den hinteren gewindelosen Schaftteil der a den Gewindeteil, d die Eindring- und Führungespitze, e die Auß enseite des Gewindeteils, f die Vorderseite des Gewindequerschnittes, . die in die Außenseite des gleichen Querschnittßs übergehen kann, g die Gewindebasis und h die Hinterseite des Gewindequerschnittee, die reit der Außenseite eine scharfe Ecke bildet. Aua den "Zeichnungen ist die (4;usbiluung der schraube klar zu ersehen. Nachdem Mark mit einem Bohrer gegebenenfalls ein Loch gebohrt hat, j:ird die Spitze ä rUt axialen Schlägen oder )rual@lcra.ften so,eit vorgetreten, ciaß der ire",inrietoil o in das Loch eintritt und cseeisen -urch,aeeser ehr und viehr arwei.- tert, inde:a zunächst die ;chz°@@eite f und =seltließend die schachkonische Fläche an der Außenseite e des Gewindes ein- dringt, so daß dat von der 'jcij_,aube` durohriuerta s:i,e.sterial ste- tig zur >>e ite gedrringt und koäupr i£ii-rt wird, dltnu dmß ciabsi. Fasern oder Späne abgerissen werden. Wenn der Eintreibvorgang vervollständigt ist, drängt das von den Gewindegängen zurückgedrückte Material elastiech zurück und ist dann bestrebt, sich der spiraligen Rinne zwischen benachbarten sGewindegängen anzupassen, so daß die schraube durch Zugkraft in Aehsrichtung nicht wieder herauskommen kann, an diesem Zustand kann die Schraube, falls erwünscht, ohne die Gewindegünge oder die Bohrung zu beeschädigen, angezogen oder herausgeschraubt werden, indem man sie in der entsprechenden Richtung dreht. die Schraubgänte gleich zu Beginn der Drehung packen, kann der Gewindeteil der Schraube - parallel zur Sobraubenachse zwei oder mehr Rinnen saufweiwen, dtaren Tiefe geringer ist als die Gewindehöhe. Wenn eine solche Sciraube mit axialen Schlingen oder Druckkraften eingetrieben wird, wird das umgebende Material im Bereich dieser Rinnen nicht verdrängt, so daß zwei oder mehr Ri ppen an der Innenseite der Bohrung entstehen, welche nachfolgend vom Gewinde durchschnitten werden, nenn man die Sichraube dreht. Innerhalb bestimmter kleinerer Abmiessungen können diese Schr auben ohne vorherige Herstellung eines rochen oder seine einer Bohrung eingetrieben werden, Wenn jedoch zuvor eine geeignet bemessens Bohrung erzeugt wird, wird die iSlchraube genauer eindringen und ist dann auch leichter zu verarbeiten.Schruube The invention relates to a wooden stick that can be driven in with a hammer and then tightened with a screwdriver or screwdriver. The object of the invention is that of driving in : 3ehrauben in wood and finderas' .ratcrial @hriliohor Jahhta too facilitate and speed up. The screw according to the invention has the following main features: A one or more gänkic; es, ohraubengevrinde with k: #n stanter Can penetrate pitch * -What axially unti.aadurch overall indicates that aoin "l j_eindeauuroarsnt a 'ra, jez is, the front of which is sloping and pointed under a udhr The angle opposite the screw axis runs through the aur'jen # geite on the iiüllfl; @iche of the -ctiraube lies, and. deaaen The rear side runs essentially perpendicular to the screw axis or is slightly inclined towards the screw towards the front. As a continuation of the = * ctiraubenkox, no, a strong, threadless:; 13itze: iit four :: grit one nail, which the @ietiraube at the l "ir = drive ft: hrt and the Alignment of the screw axis facilitated., The screw head and the rear threadless shaft part can basically be designed similarly to the corresponding parts of known screws of various shapes. Further details and features of the invention emerge from the following description and the accompanying drawing, in which two preferred embodiments for different applications are illustrated by way of example. In four: show the bill Fig. 1 is a view of a medium-length screw for wood of average thickness, Fig. 2 is an enlarged cross-section of half the central part of the scohrub of Fig. 1, Fig. 3 is a view of a larger screw with a double thread for very dense wood, concrete, plastic o . The like., The two threads ensure a more correct penetration of the screw, since all longitudinal sections of the screw run eymmetrically to the Seohraubenaohse and Fig. 4 shows an enlarged cross-section of half the thread part of the screw of Fig. 3. In the drawing: the screw head, b the rear threadless shaft part of a the threaded part, d the penetration and guide tip, e the outside of the threaded part, f the front of the thread cross-section,. which can merge into the outside of the same cross-section, g the thread base and h the rear side of the thread cross-section, which forms a sharp corner on the outside. In addition to the "drawings, the (4; training of the screw is clearly visible see. After mark with a drill if necessary Hole has drilled, j: ird the tip arUt axial blows or ) rual@lcra.ften so, ever stepped forward, ciaß der ire ", inrietoil o in the hole enters and cseeisen -urch, aeeser ehr und viehr arwei.- tert, inde: a first die; chz ° @@ eite f and = seltlieend die chess conical surface on the outside e of the thread penetrates, so that dat from the 'jcij_, aube` durohriuerta s: i, e.sterial ste- tig is pushed to the side and koäupr i £ ii-rt, dltnu dmß ciabsi. Fibers or chips are torn off. When the driving-in process is completed, the material pushed back by the threads pushes back elastiech and then tries to adapt to the spiral groove between adjacent threads, so that the screw cannot come out again due to tensile force in the axial direction; the screw can in this state, if Desired without damaging the threads or the bore, tightened or unscrewed by turning them in the appropriate direction. The screw thread can grab the screw at the beginning of the rotation, the threaded part of the screw can have two or more grooves parallel to the screw axis, the depth of which is less than the thread height. If such a Sciraube is driven in with axial loops or compressive forces, the surrounding material in the area of these grooves is not displaced, so that two or more Ri ppen arise on the inside of the hole, which are subsequently cut by the thread, called turning the screw. Within certain smaller dimensions, these screws can be driven in without a hole or a hole being made beforehand. However, if a suitably dimensioned hole is made beforehand, the screw will penetrate more precisely and will then also be easier to work with.

Claims (4)

P a t e n t a n s p r---ü a h e
1. :3chraube fair -iolz unc: anderes ah.torial mauzlicrer )iChte' ::e@.che -nit iarmursc};2:gen oder nan:tigen in i'ichtung der iohrauben@chse wirkenden k=rften eingetrieben uni durch :irehung mit "41trauben-icher odur Esel an,.:.e- zot:en und gelüut .:erden kuru:v k;clzeruizeichn--'t durch einen zylindrischen oder-- vehwachkonisohen ..chnft rtit acharter 3pitaef welche die Führung der äeraube zbernm:nt und aas korrekt* @=;indringen des Gewindeteils in :choriohtutg erleichtert! wobei der "uuraehnitt des am festem .,,ekirauben- kern angebrachten Ofewindes mit ziemlich echvraeüer `te@url ausgebildet und die .l@@Ullfliche des Gewinden ein in ßinüring- richtung konvergierender Kegel iotg no daß beim .'.;ntrviben der Sehraube mit einem 11rmmer oder einer ähnlichen Druck- vorrichtung die :;cha#aube in das Material eindrini.;t, ohne die Innenfläche der Bohrung zu. bteohidien.
P atentans p r --- ü ahe
1.: 3 screw fair -iolz unc: different ah.torial mauzlicrer) iChte ' :: e @ .che -nit iarmursc}; 2: gen or nan: tigen in the direction of the iohrauben @chse acting forces driven uni through : irehung with "41trauben-icher odur donkey an,.:. e- zot: en und gelüut.: erden kuru: vk; clzeruizeichn - 't by one cylindrical or - vehwachkonisohen ..chnft rtit acharter 3pitaef which the leadership of the äeraube zbernm: nt and aas correct * @ =; penetration of the threaded part in: choriohtutg relieved! whereby the "uuraehnitt des am firm. ,, ekirauben- at the core of the furnace wind with quite echvraeüer `te @ url trained and the .l @@ Ullfliche of the thread a in ßinüring- direction of converging cones iotg no that at the. '.; ntrviben the vision hood with a 11-arm or similar pressure device that:; cha # aube penetrates the material.; t, without the inner surface of the bore to. bteohidien.
2. Schraube noch An Spruch 1, dadurch gekennzeichnet, daß die Hinterseite des Gewrindequersehnittes von einer Linie begrenzt wird, die senkrecht zur Schraubenachse verläuft oder geringfügig von außen nach innen in Riehtung der Sschraubenspitze geneigt ist, so daß die scharfe Hinterkante das Gewindeganges beim Eintreiben der Schraube ohne Drehung aufgrund der elastischen Rückbewegung das umgebenden Materials das Letztere erfaßt, so daß die Schraube fest in ihrer Lage gehalten wird und sich durch eine Drehung um ihre Achse anziehen oder lösen lädst, 2. screw still to saying 1, characterized in that the rear of the thread cross-section is limited by a line perpendicular to the screw axis runs or slightly from the outside to the inside in the direction of the screw tip is inclined so that the sharp trailing edge the thread when driving the Screw without rotation due to the elastic return movement of the surrounding material the latter detected so that the screw is held firmly in place and is tighten or loosen by turning around its axis, 3. Holzschraube für Holz oder ähnliches Material nach Anspruch 1 und 2, dadurch gekennzeichnet, daß sie zur Verwendung in einem zuvor gebohrten Loch vorgesehen ist, we1-cties in Abhängigkeit vom schraubenschaftdurchmesser und von der dichte des von vder Schraubeb zu durchdringergen terials zylindrisch oder konisch sein kann. 3. Wood screw for Wood or similar material according to claims 1 and 2, characterized in that it is intended for use in a previously drilled hole, depending on we1-cties the screw shaft diameter and the density of the screw to penetrate terials can be cylindrical or conical. 4. Holzechraube für Holz oder ähnliches Material nach Arnspruch 1 bis 3, dadurch gekennzeichnet, daß die Gowindegänge von zwei oder mehr parallel zur Schraubenachse verlaufenden Rinnen durchschnitten sind, deren Tiefe geringer alo die Gewindehöhe ist, so daß beim ßintreiben der Schraube reit axialen Sohlägen oder Druckkräften an der Innenseite der Bohrung zwei oder mehr nippen entstehen, die bei einer nachfolgenden Drehung der Sciraube um ihre Achse von den Gewindegängen durchschnitten worden,4. Wood screw for wood or the like Material according to Arnspruch 1 to 3, characterized in that the Gowindegänge from two or more grooves running parallel to the screw axis are cut through, the depth of which is less than the thread height, so that when the screw is driven in rit axial sole saws or compressive forces on the inside of the bore two or more sips arise, which result in a subsequent rotation of the Sciraube around hers Axis has been cut through by the threads,
DENDAT1400911 1962-08-14 screw Pending DE1400911A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT1638762 1962-08-14

Publications (1)

Publication Number Publication Date
DE1400911A1 true DE1400911A1 (en) 1969-01-30

Family

ID=11148845

Family Applications (1)

Application Number Title Priority Date Filing Date
DENDAT1400911 Pending DE1400911A1 (en) 1962-08-14 screw

Country Status (1)

Country Link
DE (1) DE1400911A1 (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2644215A1 (en) * 1976-09-30 1978-04-06 Agfa Gevaert Ag Screw for push insertion and rotary removal - has insertion material dependent angle between front edge and central axis
DE3122503A1 (en) * 1981-06-05 1982-12-30 Hilti AG, 9494 Schaan FASTENING ELEMENT WITH PLASTIC SPREADING SLEEVE AND SPREADING SCREW
DE3441784A1 (en) * 1984-11-15 1986-05-22 Velux GmbH - Bauzubehör, 2000 Hamburg Knock-in screw
EP0243526A1 (en) * 1986-05-02 1987-11-04 V. Kann Rasmussen Industri A/S Drive-in screw
DE3705650A1 (en) * 1986-06-18 1987-12-23 Oskar Fleck Nail for the fastening of ridge tiles
DE4108771A1 (en) * 1991-03-18 1992-09-24 Wuerth Adolf Gmbh & Co Kg CHIPBOARD SCREW
WO1997022811A1 (en) * 1995-12-15 1997-06-26 European Industrial Services Limited Threaded fastener
DE10060244A1 (en) * 2000-12-05 2002-06-20 Lutz Planitz Screw has sharp, unthreaded point, allowing it to be partially driven in with hammer, after which it is screwed in as usual
DE102012211638A1 (en) * 2012-07-04 2014-05-08 René Mitscherlich Anchoring system for producing a connection between component and support material e.g. brick, has cap-shaped screw head that is attached to spherical aperture of through holes, at opposite side of supporting surface of anchorage plate

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2644215A1 (en) * 1976-09-30 1978-04-06 Agfa Gevaert Ag Screw for push insertion and rotary removal - has insertion material dependent angle between front edge and central axis
DE3122503A1 (en) * 1981-06-05 1982-12-30 Hilti AG, 9494 Schaan FASTENING ELEMENT WITH PLASTIC SPREADING SLEEVE AND SPREADING SCREW
DE3441784A1 (en) * 1984-11-15 1986-05-22 Velux GmbH - Bauzubehör, 2000 Hamburg Knock-in screw
EP0243526A1 (en) * 1986-05-02 1987-11-04 V. Kann Rasmussen Industri A/S Drive-in screw
DE3705650A1 (en) * 1986-06-18 1987-12-23 Oskar Fleck Nail for the fastening of ridge tiles
DE4108771A1 (en) * 1991-03-18 1992-09-24 Wuerth Adolf Gmbh & Co Kg CHIPBOARD SCREW
WO1997022811A1 (en) * 1995-12-15 1997-06-26 European Industrial Services Limited Threaded fastener
DE10060244A1 (en) * 2000-12-05 2002-06-20 Lutz Planitz Screw has sharp, unthreaded point, allowing it to be partially driven in with hammer, after which it is screwed in as usual
DE102012211638A1 (en) * 2012-07-04 2014-05-08 René Mitscherlich Anchoring system for producing a connection between component and support material e.g. brick, has cap-shaped screw head that is attached to spherical aperture of through holes, at opposite side of supporting surface of anchorage plate

Similar Documents

Publication Publication Date Title
DE2607338C2 (en) Knock-in dowel with expansion sleeve and expansion element
DE3909725C1 (en) Hole- and thread-forming screw
DE6609113U (en) SCREW.
DE4041765C2 (en) Screw-in dowels
DE480449C (en) Fastening screw
DE2656676A1 (en) ONE-PIECE SELF-DRILLING DOWEL
DE19852339B4 (en) Concrete screw
DE102008057678A1 (en) Screw for use in e.g. timber work, has thread rolled on region, where folded thread is provided in tip region of thread and expanding units i.e. cutting ribs, are provided in another region, above thread and below screw shaft
DE3117624C2 (en) Self-forming universal screw
DE1400911A1 (en) screw
DE60311737T2 (en) Clamp for a blanket
DE3100804A1 (en) "INJECTION PACKER FOR HOLE HOLE CLOSURES IN A MASONRY OR GROWN ROCK"
DE19642914A1 (en) Screw-fastening plug, especially to put in material with weak regions
DE6610141U (en) ONE-PIECE FASTENING BOLT.
DE1232538B (en) Anchor rod, especially for the expansion of pit spaces
DE3345696C2 (en) Fixing dowels
DE2537446C3 (en) Self-tapping self-tapping screw
DE19634383A1 (en) Connection device for driving into bore in a workpiece
DE4405410A1 (en) Fastening element for driving into hard recording materials using powder-operated setting tools
EP0465767A1 (en) Reinforced concrete foundation pile
DE2057970A1 (en) Expanding dowel
DE2164666A1 (en) Anchor bolts
DE3138882A1 (en) Tool for screwing in hooked bolts
CH706467A1 (en) Screw for lightweight materials.
EP4283140A1 (en) Fastening element made of wood and/or wooden materials