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DE3003280A1 - Enhanced grip self tapping screw - has twin threads with same pitch and different thread thickness - Google Patents

Enhanced grip self tapping screw - has twin threads with same pitch and different thread thickness

Info

Publication number
DE3003280A1
DE3003280A1 DE19803003280 DE3003280A DE3003280A1 DE 3003280 A1 DE3003280 A1 DE 3003280A1 DE 19803003280 DE19803003280 DE 19803003280 DE 3003280 A DE3003280 A DE 3003280A DE 3003280 A1 DE3003280 A1 DE 3003280A1
Authority
DE
Germany
Prior art keywords
threads
thread
screw
self
tapping screw
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.)
Withdrawn
Application number
DE19803003280
Other languages
German (de)
Inventor
Frank 5758 Fröndenberg Knoche
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.)
J GEORG BIERBACH SCHRAUBENFABRIK 5990 ALTENA DE
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 DE19803003280 priority Critical patent/DE3003280A1/en
Publication of DE3003280A1 publication Critical patent/DE3003280A1/en
Withdrawn legal-status Critical Current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
    • F16B25/0036—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
    • F16B25/0047—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 being characterised by its cross-section in the plane of the shaft axis
    • 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
    • F16B25/0068—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 with multiple-threads, e.g. a double thread 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
    • F16B25/10—Screws performing an additional function to thread-forming, e.g. drill screws or self-piercing 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
    • F16B25/10—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

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 self tapping screw with enhanced grip has twin threads with identical pitch and with different thread thicknesses (4,5). The radius of the pitch turns is the same and the combination of the two threads combines optimum grip ease of insertion. The head of the screw is adpated to suit the different materials, with a nail shaped point (1) for wood cutting. The head has a crossed slot for max. grip. The narrow threads may have their faces forming an angle of 30 deg. at the sharp edge of the thread, while the faces on the broad threads form an angle of 40 deg.

Description

Selbstschneidende bzw. selbstfurchende SchraubeSelf-tapping or self-tapping screw

Die Erfindung betrifft eine selbstschneidende bzw. selbstfurchende Schraube mit zwei gleich hohen Gewindegängen.The invention relates to a self-tapping or self-grooving Screw with two threads of the same height.

Es sind doppelgängige Schrauben dieser Art bekannt, deren Gewindegänge gleich hoch und im Profil gleich gross sind, die, bei dreieckförmigem Profil also jeweils gleich grossen Scheitelwinkel besitzen. Es sind auch schon doppelgängige Schrauben dieser Art bekannt, bei denen die beiden Gewindegänge unterschiedliche Höhe besitzen. Bei dreieckförmigem Profil besitzt der höhere Gewindegang beispielsweise einen Scheitelwinkel von 300 und der niedrigere Gewindegang einen Scheitelwinkel von 600. Die &uerschnittsflächen dieser beiden unterschiedlich hohen Gewindegänge sind daher ebenfalls im wesentlichen gleich gross. Diesen bekannten Schrauben ist der Nachteil gemeinsam, dass sie keine optimalen Ausreisswerte besitzen.There are double-thread screws of this type known whose threads are the same height and the same size in profile, that is, with a triangular profile each have the same vertex angle. They are already double Known screws of this type in which the two threads are different Own height. In the case of a triangular profile, for example, the higher thread pitch has an apex angle of 300 and the lower thread an apex angle of 600. The cross-sectional areas of these two thread turns of different heights are therefore also essentially the same size. This known screw is the disadvantage in common that they do not have optimal breakaway values.

Es ist daher Aufgabe der Erfindung, eine Schraube dieser Art mit optimalen Ausreisswerten zu schaffen.It is therefore an object of the invention to provide a screw of this type with optimal To create breakaway values.

Diese Aufgabe wird ausgehend von einer Schraube laut Oberbegriff des Hauptanspruches durch dessen kennzeichnende Merkmale gelöst.This task is based on a screw according to the generic term of Main claim solved by its characterizing features.

Vorteilhafte Weiterbildungen ergeben sich aus den Unteransprüchen.Advantageous further developments result from the subclaims.

Eine erfindungsgemässe Schraube gewährleistet maximale Auszugskräfte, da durch die unterschiedlich grossen Profilquerschnitte der beiden gleich hohen Gewindegänge die Zwischenräume zwischen den Gewindegängen optimal mit verdrängtem Material wie Holz, Spanplattenmaterial, Kunststoff, Blech oder dergleichen ausgefüllt sind und daraus ein Maximum an Haltekraft für die Schraube resultiert. Die unterschiedlich grossen Profilquerschnitte ergeben für die beiden Gewindegänge auch unterschiedliche Radialkräfte, vor allem durch die höhere Radialkraft des Gewindeganges mit dem grösseren Querschnitt wird das Material voll an die Gewindeflanken der Schraube angepresst und dadurch eine Art Verkeilung erzielt. Daraus resultieren die extrem hohen Ausreisswerte, wie sie bisher nur mit Schrauben von wesentlich grösserem Aussendurchmesser erzielbar sind.A screw according to the invention ensures maximum pull-out forces, because of the different size profile cross-sections of the two equally high Threads the spaces between the threads optimally with displaced Material such as wood, chipboard material, plastic, sheet metal or the like filled out and this results in a maximum of holding force for the screw. The different large profile cross-sections also result in different threads for the two threads Radial forces, mainly due to the higher radial force of the thread turn with the larger one Cross-section, the material is pressed fully against the thread flanks of the screw and thereby achieved a kind of wedging. This results in the extremely high pull-out values, as previously only achievable with screws with a significantly larger outer diameter are.

Die erfindungsgemässe Massnahme kann bei allen möglichen Gewindegangprofilen angewendet werden, beispielsweise bei Profilen mit konkav oder konvex gekrümmten Gewindegangflanken oder beispielsweise auch bei Gewindegängen mit- trapezförmigem Profil. Besonders vorteilhaft ist die erfindungsgemässe Massnahme jedoch bei Gewindegängen mit dreieckförmigem Profil. Die erfindungsgemässe Massnahme ist im übrigen sowohl für selbstschneidende Schrauben, wie sie-meist für Holz verwendet werden, als auch für sogenannte selbstfurchende Schrauben, die durch spanlose Verdrängung ihr Gewinde in Metall oder dergl.The measure according to the invention can be applied to all possible thread profiles can be used, for example, for profiles with concave or convex curvature Thread flanks or, for example, also with threads with a trapezoidal shape Profile. However, the measure according to the invention is particularly advantageous in the case of threads with triangular profile. The measure according to the invention is moreover both for self-tapping screws, as they are mostly used for wood, as well for so-called self-tapping screws, the thread of which by non-cutting displacement in metal or the like.

selbst ausbilden, geeignet. Die erfindungsgemässe Gewindeausbildung ist im übrigen in Kombination mit den verschiedenartigsten Schaubenspitzen anwendbar, beispielsweise bei Schrauben mit sogenannten NageXgitzen oder auch konisch geformten Spitzen.Besonders vorteilhaft hat es sich erwiesen, die Spitze der Schraube gemäss derm Gebrauchsmuster 79 09 735 auszubilden.train yourself, suitable. The thread formation according to the invention can also be used in combination with a wide variety of screw tips, for example with screws with so-called NageXgitzen or also conically shaped Points. It has proven particularly advantageous to position the point of the screw according to derm utility model 79 09 735.

Welcher der beiden Gewindegänge den grösseren Profilquerschnitt besitzt, hängt von dem'Anwendungsgebiet der Schraube ab. Im allgemeinen wird der erste Gewindegang, der in Richtung der Spitze zuerst beginnt, in seinem Querschnitt geringer gewählt werden. Die beiden Gewindegänge erstrecken sich vorzugsweise über die gesamte Schaftlänge zwischen Schraubenspitze und Schraubenkopf. Der Schraubenkopf selbst kann jdde bekannte gewünschte Form besitzen. Um das Eindrehen der Schraube vor allem bei selbstfurchenden- Schrauben zu erleichtern, ist es vorteilhaft, einige der anfänglichen Gewindegänge unmittelbar anschliessend an die Spitze in der Höhe zunehmend ansteigen zu lassen. Die Schraube selbst kann aus den verschiedenartigsten Materialien bestehen, beispielsweise aus Chrom-Nickelstahl oder einem ferritischen Chromstahl. Sie kann aUch in bekannter Weise mit einer abriebfesten Gleitschicht beschichtet sein. Die Herstellung kann -in bekannter Weise mit Flachbackenwalzwerkzeugen oder auch Rundwalzwerkzeugen erfolgen.Which of the two threads has the larger profile cross-section, depends on the area of application of the screw. In general, the first thread turn is which begins first in the direction of the tip is chosen to be smaller in its cross-section will. The two threads preferably extend over the entire length of the shaft between screw tip and screw head. The screw head itself can be known to anyone have the desired shape. To ensure that the screw is screwed in, especially with self-tapping To facilitate screws, it is beneficial to use some of the initial threads immediately after the top to let increase in height increasingly. The screw itself can consist of a wide variety of materials, for example made of chrome-nickel steel or a ferritic chrome steel. It can also be used in well-known Way be coated with an abrasion-resistant sliding layer. The manufacture can -done in a known manner with flat-jaw rolling tools or round rolling tools.

Die Erfindung wird im folgenden anhand einer schematischen Zeichnung an einem Ausführungsbeispiel näher erläutert.The invention is illustrated below with reference to a schematic drawing explained in more detail using an exemplary embodiment.

Die Figur zeigt im vergrösserten Maßstab eine selbstschneidende Holzsehraube mit einer Nagelspitze 1 und einem Schraubkopf 2 mit versenktem Kreuzschlitz. Auf dem zylindrischen Schraubenschaft 3 sind zwei gleich hohe Gewindegänge 4 und 5 aufgebracht. Der Profilquerschnitt des einen Gewindeganges 4 ist grösser gewählt als der Profilquerschnitt des anderen Gewindeganges 5. Bei dem- dargestellten Ausführungsbeispiel mit dreieckförmigem Profil der beiden Gewindegänge 4 und 5 wird dies dadurch erreicht, dass der Scheitelwinkel a dieser beiden Gewinde-profile unterschiedlich gross gewählt ist. In dem gezeigten Ausführungsbeispiel einer selbstschneidenden Schraube mit relativ schlanken Gewindeprofilen ist der Scheitelwinkel des Gewindeganges 4 beispielsweise 400 und derjenige des Gewindeganges 5 mit 300 gewählt. Daraus resultieren entsprechend unterschiedlich grosse Radialkräfte. Für ebene selbstfurchende Metallschraube werden die Profile etwas breiter gewählt, bei dreieckförmigem Profil wird der Scheitelwinkel des einen Ganges 4 beispielsweise mit 600 und der Scheitelwinkel des anderen Ganges 5 beispielsweise mit 400 gewählt. Diese relativ stumpfen Gewindegänge sind hierbei an den Schneiden vorzugsweise noch abgerundet.The figure shows a self-tapping wooden hood on an enlarged scale with a nail tip 1 and a screw head 2 with a recessed Phillips head. on the cylindrical screw shaft 3 has two threads 4 and 5 of the same height. The profile cross-section of the one thread 4 is selected to be larger than the profile cross-section of the other thread turn 5. In the illustrated embodiment with a triangular Profile of the two threads 4 and 5, this is achieved in that the apex angle a of these two thread profiles is selected to be of different sizes. In the one shown Embodiment of a self-tapping screw with relatively slim thread profiles is the apex angle of the thread 4, for example 400 and that of the Thread turn 5 with 300 selected. This results in correspondingly different ways size Radial forces. The profiles become something for flat self-tapping metal screws Chosen wider, with a triangular profile, the apex angle of one corridor is 4 for example with 600 and the apex angle of the other gear 5 for example elected with 400. These relatively blunt threads are here on the cutting edges preferably rounded.

Wie das Ausführungsbeispiel zeigt, nimmt die Höhe der Gewindegänge in Richtung der Spitze bei den letzten Gängen etwas ab. Der Kraftaufwand für die Ausformung des Gewindes wird hierdurch verringert.As the embodiment shows, the height of the threads increases towards the top in the last courses. The effort required for the This reduces the formation of the thread.

Oberhalb dieses Gewinde-Anfangbereiches besitzen die beiden Gewindegänge dann gleichbleibende Höhe und damit auch gleichbleibenden Aussendurchmesser.The two thread turns have above this thread starting area then constant height and thus also constant outer diameter.

Claims (7)

Patentansprüche ro Selbstschneidende bzw. selbstfurchende Schraube mit zwei gleich hohen Gewindegängen,- d a d u r c h g e k e n n z e i c h n e t, dass die Gewindegänge (4,5) unterschiedlich grosse Querschnitte besitzen. Claims ro Self-tapping or self-tapping screw with two threads of the same height, that the threads (4, 5) have cross-sections of different sizes. 2. Schraube nach Anspruch 1, deren beide Gewindegänge etwa dreieckförmiges Profil besitzen, d a d u r c h g e k e n n z e i c h n e t, dass die Scheitelwinkel (a) der beiden Profile unterschiedlich gross gewählt sind.2. Screw according to claim 1, the two threads of which are approximately triangular Have a profile that shows that the vertex angles (a) the two profiles are selected to be of different sizes. 3. Selbstschneidende Schraube nach Anspruch 1 oder 2, d a d u r c h g e k e n n z e i c h n e t, dass das Profil der beiden Gewindegänge (4,5) relativ schlank gewählt ist und die Gewindeschneiden relativ scharf ausgebildet sind.3. Self-tapping screw according to claim 1 or 2, d a d u r c it is noted that the profile of the two thread turns (4, 5) is relative is chosen to be slim and the thread cutting is relatively sharp. 4. Schraube nach Anspruch 2 und 5, d a d u r c h g e -k e n n z e i c h n e t, dass der Scheitelwinkel (a) des einen Gewindeganges (5) 300 und der des anderen Gewindeganges (4) 400 gewählt ist. 4. Screw according to claim 2 and 5, d a d u r c h g e -k e n n z e i c h n e t that the apex angle (a) of one thread turn (5) 300 and the of the other thread turn (4) 400 is selected. 5. Selbstfurchende Schraube nach Anspruch 1 oder 2, d a d u r c h g e k e n n z e i c h n e t, dass das Profil der beiden Gewindegänge relativ breit gewählt ist und die Gewindeschneiden abgerundet sind.5. Self-tapping screw according to claim 1 or 2, d a d u r c h it is not noted that the profile of the two threads is relatively wide is selected and the thread cutting is rounded. 6. Schraube nach Anspruch 2 und 5, d a d u r c h g e -k e n n z e i c h ne t, dass der Scheitelwinkel (a) des einen Gewindeganges (5) 400 und der des anderen Gewindeganges (4) 600 gewählt ist.6. Screw according to claim 2 and 5, d a d u r c h g e -k e n n z e i c h ne t that the apex angle (a) of one thread turn (5) 400 and the of the other thread turn (4) 600 is selected. 7. Schraube nach einem oder mehreren der vorhergehenden Ansprüche, d a d u r c h g e k e n n z e i c h -n e t, dass die Hbhe.der Gewindegänge (4,5) im Anfangsbereich in Richtung der Schraubenspitze (1) über mehrere Gänge allmählich abnehmend ausgebildet ist.7. Screw according to one or more of the preceding claims, d a d u r c h e k e n n n z e i c h -n e t that the height of the thread turns (4,5) in the initial area in the direction of the screw tip (1) gradually over several turns is designed to decrease.
DE19803003280 1980-01-30 1980-01-30 Enhanced grip self tapping screw - has twin threads with same pitch and different thread thickness Withdrawn DE3003280A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19803003280 DE3003280A1 (en) 1980-01-30 1980-01-30 Enhanced grip self tapping screw - has twin threads with same pitch and different thread thickness

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19803003280 DE3003280A1 (en) 1980-01-30 1980-01-30 Enhanced grip self tapping screw - has twin threads with same pitch and different thread thickness

Publications (1)

Publication Number Publication Date
DE3003280A1 true DE3003280A1 (en) 1981-08-06

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DE19803003280 Withdrawn DE3003280A1 (en) 1980-01-30 1980-01-30 Enhanced grip self tapping screw - has twin threads with same pitch and different thread thickness

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0102605A1 (en) * 1982-09-02 1984-03-14 Rockenfeller KG Befestigungselemente Wood-screw
WO1984002380A1 (en) * 1982-12-17 1984-06-21 Gkn Screws Fasteners Ltd A screw
DE3337534A1 (en) * 1983-10-14 1985-05-02 Alfons 5758 Fröndenberg Knoche Universal screw, tool for producing universal screws of this type, and screwdriver for universal screws of this type
EP0142037A1 (en) 1983-10-14 1985-05-22 Alfons Knoche Universal screw
EP0514916A1 (en) * 1991-05-24 1992-11-25 Adolf Würth GmbH & Co. KG Screw for fastening of gypsum plaster boards
EP0575295A1 (en) * 1992-06-18 1993-12-22 Mungo Befestigungstechnik Ag Screw-type sleeve
EP1036949A1 (en) * 1999-03-17 2000-09-20 Illinois Tool Works Inc. Fastener having primary and secondary threads
EP1122448A1 (en) * 2000-02-03 2001-08-08 SFS Industrie Holding AG Wood screw or the like
US6415935B1 (en) * 1998-04-29 2002-07-09 Georg Menshen Gmbh & Co. Kg Multiple-thread screw thread arrangement with diverse thread turn runout arrangement

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0102605A1 (en) * 1982-09-02 1984-03-14 Rockenfeller KG Befestigungselemente Wood-screw
WO1984002380A1 (en) * 1982-12-17 1984-06-21 Gkn Screws Fasteners Ltd A screw
DE3337534A1 (en) * 1983-10-14 1985-05-02 Alfons 5758 Fröndenberg Knoche Universal screw, tool for producing universal screws of this type, and screwdriver for universal screws of this type
EP0142037A1 (en) 1983-10-14 1985-05-22 Alfons Knoche Universal screw
EP0514916A1 (en) * 1991-05-24 1992-11-25 Adolf Würth GmbH & Co. KG Screw for fastening of gypsum plaster boards
EP0575295A1 (en) * 1992-06-18 1993-12-22 Mungo Befestigungstechnik Ag Screw-type sleeve
US6415935B1 (en) * 1998-04-29 2002-07-09 Georg Menshen Gmbh & Co. Kg Multiple-thread screw thread arrangement with diverse thread turn runout arrangement
EP1036949A1 (en) * 1999-03-17 2000-09-20 Illinois Tool Works Inc. Fastener having primary and secondary threads
EP1122448A1 (en) * 2000-02-03 2001-08-08 SFS Industrie Holding AG Wood screw or the like

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8181 Inventor (new situation)

Free format text: KNOCHE, ALFONS, 5758 FROENDENBERG, DE

8127 New person/name/address of the applicant

Owner name: J. GEORG BIERBACH SCHRAUBENFABRIK, 5990 ALTENA, DE

8139 Disposal/non-payment of the annual fee