DE7933213U1 - Tapping screw - Google Patents
Tapping screwInfo
- Publication number
- DE7933213U1 DE7933213U1 DE7933213U DE7933213DU DE7933213U1 DE 7933213 U1 DE7933213 U1 DE 7933213U1 DE 7933213 U DE7933213 U DE 7933213U DE 7933213D U DE7933213D U DE 7933213DU DE 7933213 U1 DE7933213 U1 DE 7933213U1
- Authority
- DE
- Germany
- Prior art keywords
- tapping screw
- thread
- screw
- foot part
- notch
- 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
Links
- 238000010079 rubber tapping Methods 0.000 title claims description 17
- 101100286286 Dictyostelium discoideum ipi gene Proteins 0.000 claims 1
- 238000004049 embossing Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 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
- F16B25/001—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
- F16B25/0057—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 screw having distinct axial zones, e.g. multiple axial thread sections with different pitch or thread cross-sections
-
- 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
- F16B25/103—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
Description
I * · I ■ · · ffI * I ■ · ff
Patentanwälte Lüdenscheid, den 7. November 1 979Patentanwälte Lüdenscheid, November 7, 1 979
Dr. W. HaßlerDr. W. Hassler
Dipl.-Chem. F. Schrumpf 'y "Dipl.-Chem. F. Shrink ' y "
Postfach 17 04P.O. Box 17 04
Anmelderin: Firma Robert Schewe KG
Freisenbergstraße 4
5880 LUdenscheidApplicant: Robert Schewe KG
Freisenbergstrasse 4
5880 LUdenscheid
Schneidschraube für KunststoffteileTapping screw for plastic parts Beschreibungdescription
Die Neuerung betrifft eine Schneidschraube für Kunststoffteile mit blechschraubenähnlichem Gewinde und konischem Fußteil.The innovation concerns a tapping screw for plastic parts with thread similar to sheet metal screws and conical base.
Eine derartige Schneidschraube soll einerseits gute Gewindeformungseigenschaften und auch ein niedriges Einschraubmoment haben; andererseits soll das Überdrehmoment möglichst groß sein. Die Schneidschraube soll auch mehrfach einschraubbar sein, ohne daß das Gewinde ausreißt. Dieses gilt besonders für elektrische Geräte, für die besondere Sicherheits- und Prüfvorscnriften bestehen.On the one hand, such a tapping screw should have good thread-forming properties and also have a low screw-in torque; on the other hand, the overtorque should be as large as possible. The tapping screw should also be able to be screwed in several times without the thread run away. This applies in particular to electrical devices for which special safety and test regulations exist.
Die genannten Forderungen lassen sich nach der vleuerung durch die folgenden Merkmale erfüllen:The named demands can be passed after the veining meet the following characteristics:
a) die Gewindesteigung beträgt zwischen 2/3 und 3/4 des Kerndurchmessers; a) the thread pitch is between 2/3 and 3/4 of the core diameter;
b) der FlankenwirJcel des Gewindes beträgt zwischen 30 und 50°;b) the flank pitch of the thread is between 30 and 50 °;
c) im Fußteil ist eine Schneidkerbe vorgehen, deren Kerbwinkel I50 bis 1600 beträgt;c) A cutting notch is to be used in the foot section, the notch angle of which is I50 is up to 1600;
d) die Kerbkante schneidet die Schraubenachse innerhalb des Fußteils.d) the notch edge intersects the screw axis within the foot part.
Eine derartige Schneidschraube soll ein möglichst geringes Einschraubmoment erfordern, um leicht eingeschraubt werden zu können und den Verschleiß des Einschraubwerkzeugs, insbesondere der Schraubarklinge möglichst gering zu halten. Andererseits soll das Uberdrehmoment möglichst groß sein, um eine hohe Sicherheit zu gewährleisten. Waoh den einschlägigen VDE-Kichtlinien ist ein Prul'drehmoment vorgegeben, das einen sicheren Üitz der Schrauben gewährleistet« üiine weitere Forderung besteht darin, daß die Sohneidschriube auoh naoh mehrma- ligem Lösen noch einen einwandfreien Festsitz gewährleistet. Such a self-tapping screw should require the lowest possible screw-in torque in order to be able to be screwed in easily and to keep the wear of the screw-in tool, in particular the screw-in blade, as low as possible. On the other hand, the overtorque should be as large as possible in order to ensure a high level of safety. In accordance with the relevant VDE guidelines, an impact torque is specified which ensures that the screws are securely seated .
I · IlI · Il
Ds hiit eioh gezeigt« daß eine Schneidschraube mit den genannten Merkmalen diese Forderungen bestens erfüllt. Das Gewinde hat ein ssiemliöh spitzes Profil« so daß eine gute Ausbildung der Oewindegänge gewährleistet ist« Die Auebildung der Sohneidkerbe gewährleistet daiübar hinaus eine günstige (Jewindeformung« Insbesondere durch die Wahl des Winkels zwischen der Kerbkante und der Sohraubenaohse kenn die Sohneiriwirkung und die Prägewirkung gegeneinander abstimmen« Die Schraube nach der Erfindung hat ein vergleichsweise kleines Binsohraubmoment« FUr eine 3,5 mm Sahraube benötigt man ein Einsohraubmoment von 20 Ncm. Das Uberdrehmoment Deträgt etwa 180 Ncm. Diese Werte sind als sehr günstig anzusehen.This has already shown that a tapping screw with the mentioned Features these requirements are met in the best possible way. The thread has a very pointed profile, so that a good formation of the threads is guaranteed of the angle between the notch edge and the Sohraubehohse know the Coordinating the sonic effect and the embossing effect against each other «The A screw according to the invention has a comparatively small screw-in torque. For a 3.5 mm screw-in screw, a screw-in torque of 20 Ncm is required. The overtorque D is about 180 Ncm. These Values are to be regarded as very cheap.
Eine AusfUhrungsform der Neuerung wird im folgenden unter Bezugnahme auf die anliegende Zeichnung erläutert, in der darstellen«One embodiment of the innovation is explained below with reference to the attached drawing, in which Fig« 1 eine Ansicht einer Schneidschraube nach der Neuerung,1 shows a view of a tapping screw according to the innovation,
Fig. 3 eine Draufsicht auf den Fußteil und Fig. 4 eine StirnansiJht des Fußteils.3 shows a plan view of the foot part and FIG. 4 shows a front view of the foot part.
Die dargestellt Schneidschraube besitzt einen zylindrischen Kern 1 und einen keg-ilstumpfförmigen Fuß teil 2. Der Enddurehmesser dar Stirnfläche 3 des Fußteils 2 ist etwa 10 bis 20 % kleiner als der Ducnmeseer des Kerns 1. Ein Gewinde 4 ist blechschraubenartig ausgebildet. Der Flankenwinkel 0 beträgt etwa 400. Q88 Gewinde hat somit ein ziemlich spitzwinkliges Profil. Die Gewindesteigung liegt zwischen 2/3 und 3/4 des Kerndurchmessers. Die Gewindesteigung ist somit größer als bei einem üblichen Blechschraubengewinde.The tapping screw shown has a cylindrical core 1 and a truncated cone foot part 2. The Enddurehmesser the end face 3 of the foot part 2 is about 10 to 20 % smaller than the Ducnmeseer of the core 1. A thread 4 is formed like a sheet metal screw. The flank angle 0 is about 400. Q 88 thread thus has a fairly acute-angled profile. The thread pitch is between 2/3 and 3/4 of the core diameter. The thread pitch is therefore greater than that of a conventional self-tapping screw thread.
Der Schraubenkopf 7 ist in üblicher Weise ausgebildet. Im Fußteil 2 ist eine Schneidkerbe 5 ausgebildet. Die Kerbkante 6 schneidet die Schraubenachse innerhalb des Fußteils oder innerhalb der Stirnfläche 3. Diese bedeutet, daß die Schneidkante ziemlich tief in den FuJteil 2 einschneidet. Der Kerbwinkel liegt zwischen 150 und 1600. Die Gewindegänge laufen innerhalb des Fußteils 2 aus.The screw head 7 is formed in the usual way. A cutting notch 5 is formed in the foot part 2. The notch edge 6 intersects the screw axis within the foot part or within the end face 3. This means that the cutting edge cuts quite deeply into the foot part 2. The notch angle is between 150 and 1600. The threads run out within the foot part 2.
Die Schneidschraube nach der Neuerung besitzt hervorragende Gewindefornungseigenschaften, weil das Gewinde durch den Fußteil 2 vorgeschnitten und anschließend prägend ausgeformt wird. Das Einsenraub bmonient ist vergleichsweise gering. Das Überdrehmoment ist dagegen sehr große Man erzielt ohne weiteres ein Verhältnis des Überdrehinoments zum Ei.nachraubmoment von etwa 9.The tapping screw according to the innovation has excellent thread forming properties because the thread through the foot part 2 is pre-cut and then shaped in an embossing manner. The one-robbery bmonient is comparatively low. The overtightening torque, on the other hand, is very large.A ratio of the overtightening torque to the tightening torque of about 9 is easily achieved.
Claims (1)
Postfach 17 04Dipi.-Chem. P. Shrink
P.O. Box 17 04
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE7933213U1 true DE7933213U1 (en) | 1980-03-06 |
Family
ID=1325869
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE7933213U Expired DE7933213U1 (en) | Tapping screw |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE7933213U1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3926000C1 (en) * | 1989-08-05 | 1990-08-02 | Hella Kg Hueck & Co, 4780 Lippstadt, De | Self-tapping screw mfd. by cold rolling - has specified ratio between outer and core dia. and between outer dia. and pitch |
-
0
- DE DE7933213U patent/DE7933213U1/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3926000C1 (en) * | 1989-08-05 | 1990-08-02 | Hella Kg Hueck & Co, 4780 Lippstadt, De | Self-tapping screw mfd. by cold rolling - has specified ratio between outer and core dia. and between outer dia. and pitch |
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