DE3926000C1 - Self-tapping screw mfd. by cold rolling - has specified ratio between outer and core dia. and between outer dia. and pitch - Google Patents
Self-tapping screw mfd. by cold rolling - has specified ratio between outer and core dia. and between outer dia. and pitchInfo
- Publication number
- DE3926000C1 DE3926000C1 DE19893926000 DE3926000A DE3926000C1 DE 3926000 C1 DE3926000 C1 DE 3926000C1 DE 19893926000 DE19893926000 DE 19893926000 DE 3926000 A DE3926000 A DE 3926000A DE 3926000 C1 DE3926000 C1 DE 3926000C1
- Authority
- DE
- Germany
- Prior art keywords
- dia
- thread
- self
- core
- pitch
- 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.)
- Expired - Lifetime
Links
- 238000010079 rubber tapping Methods 0.000 title claims abstract description 9
- 238000005097 cold rolling Methods 0.000 title claims abstract description 6
- 229920003023 plastic Polymers 0.000 claims abstract description 4
- 239000004033 plastic Substances 0.000 claims abstract description 4
- 239000000428 dust Substances 0.000 abstract description 3
- 230000015572 biosynthetic process Effects 0.000 abstract 1
- 239000000463 material Substances 0.000 description 5
- 238000005299 abrasion Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 230000003749 cleanliness Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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
- F16B25/0073—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 characterised by its pitch, e.g. a varying pitch
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
- B21H3/00—Making helical bodies or bodies having parts of helical shape
- B21H3/02—Making helical bodies or bodies having parts of helical shape external screw-threads ; Making dies for thread rolling
- B21H3/027—Rolling of self-tapping 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
- F16B25/0042—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
- 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
-
- 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
- F16B35/044—Specially-shaped ends
- F16B35/045—Specially-shaped ends for retention or rotation by a tool
Abstract
Description
Die Erfindung betrifft eine durch Kaltwalzen spanlos geformte, selbstfurchende Schraube.The invention relates to a non-cutting by cold rolling shaped, self-tapping screw.
Ein Gewinde dieser Art ist bereits aus der DE-AS 27 54 870 bekannt. Durch den darin benutzten kleinen Flankenwinkel von 30° erreicht man zwar eine gute Schneidwirkung, bei einem geringen Anzugsmoment, jedoch sind damit Schwierigkeiten im Kaltwalzvorgang verbunden, da durch die hohen Gewindeflanken ein starkes Fließen des Werkstoffes beim Kaltverformen erforderlich ist. Dies beeinträchtigt die Haltbarkeit des Werkzeugs und die Sauberkeit des gefertigten Gewindes. Mit dem kleinen Flankenwinkel und einer großen Überdeckung der Flanken beim Schneiden des Gewindes ist ein unmittelbarer Bezug zur qualitativen Beschaffenheit des Gewindes gegeben. Durch Überwalzungsgefahr besteht ein Aufrauheffekt, vor allem an den Spitzen des Gewindes, der beim Einschrauben in beispielsweise Kunststoff zum Abrieb von Staub und Spänen führt und somit keine qualitativ hochwertigen, leichtgängigen Gewindesitze ermöglicht. Um zu günstigen Flankenüberdeckungen mit Material zu gelangen, war es bisher auch üblich, möglichst kleine Einschraublöcher zu verwenden, wodurch ein großes Verhältnis zwischen Außendurchmesser und Kerndurchmesser ermöglicht wurde. Eine Folge ist jedoch, daß es bei der Gewindeformung zum Materialstau auf dem Gewindekern kommt, der verhindert, daß die Gewindegänge vollständig bis zum Schraubenkern eindringen können. Zur Abhilfe dieses Staues wurde das Gewinde zwischen den Flanken mit einer Auslenkung versehen, die zwar die Eindringtiefe und damit die Tragfähigkeit erhöht, jedoch nicht die Qualität des Gewindes verbessert und den Abrieb beim Einschrauben ausschließt. Ein anderer negativer Effekt ist dabei die Verteuerung des Werkzeugs. Auch wird die Leichtgängigkeit des Gewindes wesentlich durch die Qualität der Gewindeflanken bestimmt.A thread of this type is already known from DE-AS 27 54 870. By the one in it used small flank angle of 30 ° can be achieved a good cutting effect with a low tightening torque, however, there are difficulties in the cold rolling process connected, because of the high thread flanks a strong Flow of the material required during cold forming is. This affects the durability of the tool and the cleanliness of the manufactured thread. With the little one Flank angle and a large coverage of the flanks at Cutting the thread is a direct reference to given the quality of the thread. By There is a risk of rolling over, especially on the tips of the thread that is screwed into for example plastic for the abrasion of dust and chips leads and therefore no high quality, enables smooth threading. To cheap It has so far been possible to cover flanks with material also usual to use the smallest possible screw holes, creating a large ratio between outside diameter and Core diameter was made possible. However, one consequence is that it in the thread forming to the material jam on the Thread core comes, which prevents the threads can fully penetrate to the screw core. To This thread was remedied by the thread between the flanks provided with a deflection, the depth of penetration and thus increases the load capacity, but not the Quality of the thread improves and the abrasion at Screwing in excludes. Another negative effect is thereby increasing the cost of the tool. Also the Smooth running of the thread essentially due to the quality the thread flanks determined.
Der Erfindung liegt deshalb die Aufgabe zugrunde, ein selbstfurchendes Gewinde zu finden, mit dem ein qualitativ hochwertiges Gewinde geschnitten werden kann, ohne Erzeugung von Staub- bzw. Spanabfällen. Dabei soll ein kontinuierliches und gut dosierbares Einschraubmoment, das nicht größer als bei den bisherigen Schrauben mit einem Flankenwinkel von 30° ist, in den meisten Kunststoffen ermöglicht werden. Der Verformungsaufwand sollte dabei geringer als bei herkömmlichen Schraubenarten sein.The invention is therefore based on the object to find self-tapping threads with the one qualitatively high quality thread can be cut without generating Dust or chip waste. Thereby a continuous and easily adjustable screwing torque, that not larger than the previous screws with one The flank angle is 30 ° in most plastics be made possible. The amount of deformation should be less than with conventional screw types.
Diese Aufgabe wird erfindungsgemäß durch die Anwendung folgender Merkmale gelöst:This object is achieved by the application solved the following features:
- - das Verhältnis zwischen Außendurchmesser (d 1) und Kerndurchmesser (d 2) beträgt etwa 1,2,- the ratio between the outer diameter (d 1 ) and the core diameter (d 2 ) is approximately 1.2,
- - das Verhältnis zwischen Außendurchmesser (d 1) und der Steigung (P) beträgt etwa 2,9,- the ratio between the outer diameter (d 1 ) and the pitch (P) is about 2.9,
- - der Flankenwinkel (α) hat einen Wert von etwa 40°.- The flank angle ( α ) has a value of approximately 40 °.
Durch das relativ kleine Verhältnis von Außen- zu Kerndurchmessern ergibt sich eine relativ geringe Höhe des Gewindeprofils und damit eine geringere Eindringtiefe der Gewindegänge in das Material. Infolgedessen ist auch ein wesentlich geringeres Fließen des Materials im Prozeß des Kaltwalzens erforderlich, was auch die Überwalzungsgefahr im Zusammenwirken mit dem größeren Flankenwinkel von 40° verhindert und die Qualität des Gewindes verbessert. Das geringere Tragverhalten aufgrund weniger tief ausgeformter Gewindeflanken wird dabei berücksichtigt, indem ausreichend kleine Abstände zwischen benachbarten Gewindegängen bzw. pro Längeneinheit bestehen, so daß es bei kürzeren Schraubentypen oder Einschraublöchern nicht zu Problemen in der Fluchtung von Schraubenachse zu Schraubenlochachse kommt. Die in den Merkmalen angegebenen Bemessungsgrenzen sollen nicht einschränkend verstanden sein, sie geben lediglich die in der Praxis ermittelten, optimierten Werte wieder. Durch die erhaltenen, qualitativ sauberen, mit einem geringen kontinuierlichen Einschraubmoment behafteten Gewinde eignen sich diese besonders gut für Ein- und Verstelleinrichtungen, wobei die Einschraubkräfte über beispielsweise Innen- und Außentorxe an den Enden der Gewinde übertragen werden.Due to the relatively small ratio of outside to Core diameters result in a relatively small height of the Thread profile and thus a lower penetration depth of the Threads in the material. As a result is also a much less flow of material in the process of Cold rolling is required, which also increases the risk of rolling Interact with the larger flank angle of 40 ° prevents and improves the quality of the thread. The lower load-bearing behavior due to less deeply shaped Thread flanks are taken into account by sufficient small distances between adjacent threads or per Unit of length exist, so that it is shorter Screw types or screw holes do not cause problems in the alignment of screw axis to screw hole axis is coming. The design limits specified in the characteristics are not meant to be limiting, they give only the optimized values determined in practice again. Because of the preserved, qualitatively clean, with a low continuous screwing torque Threads are particularly suitable for in and Adjustment devices, the screwing forces over for example inner and outer torxes at the ends of the Threads are transferred.
Ein weiterer Vorteil des erfindungsgemäßen Gewindes besteht darin, daß es eingängig ausgeführt ist. Hierzu ist es möglich, ein wenig aufwendiges und kostengünstiges Werkzeug zu erstellen.Another advantage of the thread according to the invention is in that it's catchy. This is it possible, a little complex and inexpensive tool to create.
In der Zeichnung ist ein Ausführungsbeispiel der Erfindung dargestellt. Es zeigtIn the drawing is an embodiment of the invention shown. It shows
Fig. 1 eine Seitenansicht vom Tragteil eines erfindungsgemäßen Schraubenprofils, Fig. 1 is a side view of the support part of a screw profile of the invention,
Fig. 2 eine Seitenansicht einer Kugelschraube mit erfindungsgemäßem Schraubenprofil, mit an den Enden befindlichen Innen- und Außentorx. Fig. 2 is a side view of a ball screw with screw profile according to the invention, with the inner and outer torx located at the ends.
In Fig. 1 ist ein Abschnitt eines selbstfurchenden Gewindeprofils mit (1) bezeichnet. Ein mit (d 1) bezeichneter Durchmesser bezeichnet den Außendurchmesser als größten Durchmesser des Gewindes und (d 2) den Kerndurchmesser als kleinsten Durchmesser des Gewindes. Mit (α) ist ein Flankenwinkel bezeichnet, der hier im Beispiel bei 40° liegt. Ein mit (P) bezeichneter Abstand zwischen zwei Flankenspitzen kennzeichnet die Steigung des Gewindes, die in diesem Beispiel bei 1,7 liegt. In Fig. 1 a section of a self-tapping thread profile is designated by ( 1 ). A diameter denoted by (d 1 ) denotes the outer diameter as the largest diameter of the thread and (d 2 ) the core diameter as the smallest diameter of the thread. ( Α ) denotes a flank angle, which in this example is 40 °. A distance (P) between two flank tips marks the pitch of the thread, which in this example is 1.7.
Das in Fig. 2 dargestellte, in der Praxis als Einstell- und Verstellschraube benutzte Beispiel einer selbstfurchenden Schraube findet seine Anwendung bei Scheinwerfergehäusen bzw. Reflektoren. Das selbstfurchende Gewinde (1) beginnt an einem Ende mit einem Außentorx (2). Gleich darin schließt sich ein Anschneidebereich (3) an, der beginnend beim Durchmesser des Kerns sich bis zur vollen Höhe der Gewindeflanken innerhalb zweier Gewindegänge aufweitet. An den Anschneidebereich (3) schließt sich über einen Tragbereich (4) das längste Stück des Gewindes an. Ein mit (5) bezeichneter Hals im Durchmesser des Kerns bildet den Übergang zwischen auslaufendem Gewinde und sich anschließender Kugel (6) für einen Innentorx (7). Die Möglichkeit zur Schraubbewegung des Gewindes besteht somit an beiden Enden der Kugelschraube mit entsprechenden Schlüsselwerkzeugen, deren formgreifende Flächen relativ klein ausfallen können, da das Gewinde ein leichtgängiges Einschraub- und Verstellmoment aufweist.The example of a self-tapping screw shown in FIG. 2 and used in practice as an adjusting and adjusting screw is used in headlight housings or reflectors. The self-tapping thread ( 1 ) begins at one end with an outer torx ( 2 ). This is immediately followed by a cutting area ( 3 ) which, starting with the diameter of the core, widens up to the full height of the thread flanks within two thread turns. The cutting area ( 3 ) is followed by the longest piece of thread via a supporting area ( 4 ). A neck ( 5 ) with the diameter of the core forms the transition between the thread and the subsequent ball ( 6 ) for an inner torx ( 7 ). There is therefore the possibility of screwing the thread at both ends of the ball screw with appropriate key tools, the shape-engaging surfaces of which can turn out to be relatively small, since the thread has a smooth screwing and adjusting torque.
Claims (2)
- a) das Verhältnis zwischen Außendurchmesser (d 1) und Kerndurchmesser (d 2) beträgt etwa 1,2,
- b) das Verhältnis zwischen Außendurchmesser (d 1) und der Steigung (P) beträgt etwa 2,9;
- c) der Flankenwinkel (α) hat einen Wert von etwa 40°.
- a) the ratio between the outer diameter (d 1 ) and the core diameter (d 2 ) is approximately 1.2,
- b) the ratio between the outer diameter (d 1 ) and the pitch (P) is about 2.9;
- c) the flank angle ( α ) has a value of approximately 40 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19893926000 DE3926000C1 (en) | 1989-08-05 | 1989-08-05 | Self-tapping screw mfd. by cold rolling - has specified ratio between outer and core dia. and between outer dia. and pitch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19893926000 DE3926000C1 (en) | 1989-08-05 | 1989-08-05 | Self-tapping screw mfd. by cold rolling - has specified ratio between outer and core dia. and between outer dia. and pitch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE3926000C1 true DE3926000C1 (en) | 1990-08-02 |
Family
ID=6386617
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE19893926000 Expired - Lifetime DE3926000C1 (en) | 1989-08-05 | 1989-08-05 | Self-tapping screw mfd. by cold rolling - has specified ratio between outer and core dia. and between outer dia. and pitch |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE3926000C1 (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19732615A1 (en) * | 1997-07-29 | 1999-02-04 | Ejot Verbindungstech Gmbh & Co | Cold-rolled self-tapping screw for use with thermoplastics |
| WO1999006719A1 (en) * | 1997-07-29 | 1999-02-11 | Ejot Verbindungstechnik Gmbh & Co. Kg | Self tapping screw |
| DE19749845A1 (en) * | 1997-11-11 | 1999-05-12 | Ejot Verbindungstech Gmbh & Co | Cold-rolled fastening screw with self-tapping thread for plastics |
| WO2001044672A1 (en) * | 1999-12-14 | 2001-06-21 | Ejot Verbindungstechnik Gmbh & Co. Kg | Self-threading screw |
| EP1296069A3 (en) * | 2001-09-25 | 2003-08-13 | Böllhoff GmbH | Sealed, adjustable and self-restraining threaded joint |
| DE102007056655A1 (en) * | 2007-11-24 | 2009-05-28 | GM Global Technology Operations, Inc., Detroit | Two side driven screw has shaft with outer thread and screw head on end, where outer thread has axial grooves on other end of shaft |
| WO2013083540A1 (en) * | 2011-12-04 | 2013-06-13 | Baier & Michels Gmbh & Co. Kg | Corrosion-resistant screw, use of a screw of this type in a corrosive environment, and method for producing a screw of this type |
| WO2014195336A1 (en) * | 2013-06-04 | 2014-12-11 | Baier & Michels Gmbh & Co. Kg | Screw, in particular for use in plastics components, and method for producing the same |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE7313726U (en) * | 1973-12-13 | Altenloh Brinck & Co | Self-tapping screw | |
| DE7933213U1 (en) * | 1980-03-06 | Robert Schewe Kg, 5880 Luedenscheid | Tapping screw | |
| DE2754870B2 (en) * | 1977-12-09 | 1980-06-26 | Eberhard Jaeger Gmbh & Co Kg, 5928 Laasphe | Self-tapping screw |
| DE8409108U1 (en) * | 1984-07-19 | Schrauben Betzer KG, 5880 Lüdenscheid | Thread forming screw | |
| CH651115A5 (en) * | 1982-02-11 | 1985-08-30 | Illinois Tool Works | SCREW ANCHORING ELEMENT. |
| EP0281203A1 (en) * | 1987-03-06 | 1988-09-07 | Kilton S.R.L. | Improved screw |
-
1989
- 1989-08-05 DE DE19893926000 patent/DE3926000C1/en not_active Expired - Lifetime
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE7313726U (en) * | 1973-12-13 | Altenloh Brinck & Co | Self-tapping screw | |
| DE7933213U1 (en) * | 1980-03-06 | Robert Schewe Kg, 5880 Luedenscheid | Tapping screw | |
| DE8409108U1 (en) * | 1984-07-19 | Schrauben Betzer KG, 5880 Lüdenscheid | Thread forming screw | |
| DE2754870B2 (en) * | 1977-12-09 | 1980-06-26 | Eberhard Jaeger Gmbh & Co Kg, 5928 Laasphe | Self-tapping screw |
| CH651115A5 (en) * | 1982-02-11 | 1985-08-30 | Illinois Tool Works | SCREW ANCHORING ELEMENT. |
| EP0281203A1 (en) * | 1987-03-06 | 1988-09-07 | Kilton S.R.L. | Improved screw |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1120941C (en) * | 1997-07-29 | 2003-09-10 | Ejot连接技术合资有限公司 | Self tapping screw |
| WO1999006719A1 (en) * | 1997-07-29 | 1999-02-11 | Ejot Verbindungstechnik Gmbh & Co. Kg | Self tapping screw |
| DE19732615A1 (en) * | 1997-07-29 | 1999-02-04 | Ejot Verbindungstech Gmbh & Co | Cold-rolled self-tapping screw for use with thermoplastics |
| DE19749845A1 (en) * | 1997-11-11 | 1999-05-12 | Ejot Verbindungstech Gmbh & Co | Cold-rolled fastening screw with self-tapping thread for plastics |
| US6722833B2 (en) | 1999-12-14 | 2004-04-20 | Ejot Verbindungstechnik Gmbh & Co. Kg | Self-threading screw with straight load flank and angled rear flank profile |
| WO2001044672A1 (en) * | 1999-12-14 | 2001-06-21 | Ejot Verbindungstechnik Gmbh & Co. Kg | Self-threading screw |
| EP1296069A3 (en) * | 2001-09-25 | 2003-08-13 | Böllhoff GmbH | Sealed, adjustable and self-restraining threaded joint |
| US6817817B2 (en) | 2001-09-25 | 2004-11-16 | Bollhoff Gmbh | Fluid-tight, adjustable and self-locking threaded connection assembly |
| DE102007056655A1 (en) * | 2007-11-24 | 2009-05-28 | GM Global Technology Operations, Inc., Detroit | Two side driven screw has shaft with outer thread and screw head on end, where outer thread has axial grooves on other end of shaft |
| WO2013083540A1 (en) * | 2011-12-04 | 2013-06-13 | Baier & Michels Gmbh & Co. Kg | Corrosion-resistant screw, use of a screw of this type in a corrosive environment, and method for producing a screw of this type |
| CN104114300A (en) * | 2011-12-04 | 2014-10-22 | 拜尔·米歇尔斯有限责任两合公司 | Corrosion-resistant screw, use of a screw of this type in a corrosive environment, and method for producing a screw of this type |
| CN104114300B (en) * | 2011-12-04 | 2016-08-24 | 拜尔·米歇尔斯有限责任两合公司 | Application in corrosive environment of corrosion-resistant bolt, this bolt and for the method manufacturing this bolt |
| WO2014195336A1 (en) * | 2013-06-04 | 2014-12-11 | Baier & Michels Gmbh & Co. Kg | Screw, in particular for use in plastics components, and method for producing the same |
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