DE3615271A1 - Screw for plastic expansion dowel - Google Patents
Screw for plastic expansion dowelInfo
- Publication number
- DE3615271A1 DE3615271A1 DE19863615271 DE3615271A DE3615271A1 DE 3615271 A1 DE3615271 A1 DE 3615271A1 DE 19863615271 DE19863615271 DE 19863615271 DE 3615271 A DE3615271 A DE 3615271A DE 3615271 A1 DE3615271 A1 DE 3615271A1
- Authority
- DE
- Germany
- Prior art keywords
- screw
- flank
- thread
- threaded base
- screw according
- 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- Withdrawn
Links
- 238000004873 anchoring Methods 0.000 claims description 4
- 239000004575 stone Substances 0.000 claims description 3
- 230000001154 acute effect Effects 0.000 claims description 2
- 239000002861 polymer material Substances 0.000 claims description 2
- 230000003313 weakening effect Effects 0.000 abstract description 2
- 238000000034 method Methods 0.000 abstract 1
- 230000035515 penetration Effects 0.000 abstract 1
- 239000000463 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
- F16B25/001—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
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Wood Science & Technology (AREA)
- Physics & Mathematics (AREA)
- Geometry (AREA)
- Joining Of Building Structures In Genera (AREA)
Abstract
Description
Die Erfindung bezieht sich auf eine gewindeformende Schraube entsprechend dem Oberbegriff des Patentanspruches 1.The invention relates to a thread-forming screw according to the preamble of claim 1.
Bei bekannten Schrauben dieser Art (DE-OS 30 03 280; DE-PSen 23 18 088; 33 35 092) besteht die Gefahr, daß das Schneidgewin de zumindest teilweise zu tief in die Dübelwandung eindringt, die dadurch geschwächt wird. In diesem Falle besteht bei starker axialer Belastung des Dübels die Gefahr eines axialen Nach gebens oder gar eines Ausreißens des Dübels aus der Wand. Im Extrem kann es sogar vorkommen, daß die Dübelwandung gänz lich durchgeschnitten wird.In known screws of this type (DE-OS 30 03 280; DE-PSen 23 18 088; 33 35 092) there is a risk that the cutting thread de at least partially penetrates too deeply into the wall of the dowel, which is weakened by it. In this case there is a strong axial loading of the dowel creates the risk of axial re-alignment giving or even pulling the dowel out of the wall. In extreme cases it can even happen that the wall of the dowel is complete is cut through.
Der Erfindung liegt die Aufgabe zugrunde, eine gewindeformende Schraube der eingangs genannten Gattung derart weiterzubilden, daß eine Schwächung der Dübelwandung im obigen Sinne nicht mehr möglich ist und daß sich zudem eine wesentlich stärkere Verankerung des Dübels in der Wand ergibt.The invention has for its object a thread forming To further develop the screw of the type mentioned at the beginning, that a weakening of the wall of the dowel in the above sense is not is more possible and that a much stronger one Anchoring the anchor in the wall results.
Diese Aufgabe wird erfindungsgemäß durch die im Kennzeichen des Patentanspruches 1 genannten Merkmale gelöst.This object is achieved by the in the license plate of claim 1 mentioned features solved.
Bei einer solchen Ausbildung ist die Einschnittiefe der Schraube in die Dübelwandung auf die Höhe des Schneidgewindes beschränkt. Letztere ist so gemessen, daß die Dübelwandung auch bei extrem axialer Belastung des Dübels in keinem Falle aufreißen kann. Zudem wird die Dübelwandung beim Einbringen der Schraube in den Dübel partiell, nämlich im Bereich der Preßschultern radial nach außen gedrückt. Wie aus Fig. 1 ersichtlich, ergeben sich daher am Mantel des in der Wand verankerten Dübels radial gerichtete Aufwölbungen, die mit dem schraubenförmigen Verlauf der Preßschulter etwa korres pondieren und die eine intensive Verkrallung des Kunststoffs des Dübels mit dem Steinbeton an der Innenwandung der Dübelbohrung bewirken (die Aufwölbungen sind in Fig. 1 zur Verdeutlichung etwas überzeichnet). With such a design, the depth of cut of the screw in the wall of the dowel is limited to the height of the cutting thread. The latter is measured in such a way that the wall of the dowel can never tear open even under extreme axial loading of the dowel. In addition, the wall of the dowel is partially pressed radially outwards when the screw is inserted into the dowel, namely in the area of the press shoulders. As can be seen from Fig. 1, there are therefore radially directed bulges on the jacket of the anchor anchored in the wall, which approximately correspond to the helical course of the press shoulder and which cause an intensive clawing of the plastic of the anchor with the stone concrete on the inner wall of the anchor hole (The bulges are somewhat exaggerated in Fig. 1 for clarity).
Zweckmäßigerweise ist ausschließlich die dem Kopf der Schraube zugewandte Flanke des Gewindeaufbaus mit einer Preßschulter ver sehen (Anspruch 5), wobei die diesem Kopf zugewandte Flanke des Schneidgewindes zur Achse der Schraube etwa einen rechten Winkel einschließt (Anspruch 10). Dadurch wird die Widerstandsfähigkeit der Schraube gegen axialen Zug wesentlich erhöht. Dies gilt auch dann, wenn gemäß Anspruch 4 die Flanken des Gewindesockels bei fehlendem oder minimalem Flankenwinkel etwa senkrecht zum Mantel des Schaftes stehen. Die Vorteil der erfindungsgemäßen Schrauben zeigen sich insbesondere auch bei verhältnismäßig "weichen" Kunststoffdübeln, also von solchen, die eine geringe Shore-Härte aufweisen.Only the head of the screw is expedient ver flank of the thread structure with a press shoulder ver see (claim 5), wherein the flank of this head facing the Cutting thread about a right angle to the axis of the screw includes (claim 10). This will increase the resilience of the Screw against axial pull significantly increased. This also applies if according to claim 4 the flanks of the threaded base in the absence or minimal flank angle approximately perpendicular to the sheath of the shaft stand. The advantages of the screws according to the invention are evident especially with relatively "soft" plastic dowels, in other words, those with a low Shore hardness.
Als Folge des erfindungsgemäßen Gewindeaufbaus kann sich ein er höhter Drehwiderstand beim Einschrauben der Schrauben in den Dübel ergeben. Dies gilt insbesondere bei Dübeln von vergleichsweise hoher Werkstoffhärte und bei Ausbildungen des Gewindeaufbaus mit einer der Schraubenspitze zugewandten Flanke, die etwa senkrecht zur Achse der Schraube steht (Fig. 6).As a result of the thread structure according to the invention, he can have increased rotational resistance when screwing the screws into the dowel. This applies in particular to dowels of comparatively high material hardness and when the thread structure is designed with a flank facing the screw tip, which is approximately perpendicular to the axis of the screw ( FIG. 6).
Nachstehend wird die Erfindung anhand der Zeichnung an einigen Ausführungsbeispielen erläutert. Es zeigtIn the following, the invention will be explained with reference to the drawing Exemplary embodiments explained. It shows
Fig. 1 die mittels Dübel in einer Bohrung einer Beton wandung verankerte Schraube (rechte Hälfte im Radial schnitt) und Fig. 1 the wall anchored by means of dowels in a bore of a concrete screw (right half in the radial section) and
Fig. 2-6 einige Varianten des Gewindeaufbaues der Schraube. Fig. 2-6 some variants of the thread structure of the screw.
Die gewindeformende Schraube dient zur Verankerung eines Spreiz dübels aus einem hochpolymeren Werkstoff (Kunststoff) in der Bohrung einer Wand oder Decke aus Stein, Beton oder dergleichen. Mit der Verankerung des Spreizdübels ergibt sich die primär gewünschte Verankerung der Schraube selbst. Die Schraube ist mit einem sich über den Schaft erstreckenden ein- oder mehrgängigen Gewinde ver sehen und weist einen Schraubenkopf sowie eine Schraubenspitze auf. Wenigstens eine Flankenfläche des Gewindeaufbaues 10 ist wenigstens abschnittsweise mit einer Stufe versehen. Durch diese Stufe ist ein Gewindesockel 10 a von einem Schneidgewinde 10 b unter Bildung einer etwa radial gerichteten Preßschulter 11 abgesetzt.The thread-forming screw is used to anchor an expansion dowel made of a high-polymer material (plastic) in the bore of a wall or ceiling made of stone, concrete or the like. With the anchoring of the expansion anchor, the primary desired anchoring of the screw itself results. The screw is seen with a single or multiple thread extending over the shaft and has a screw head and a screw tip. At least one flank surface of the thread structure 10 is provided with a step at least in sections. Through this step, a threaded base 10 a is offset from a cutting thread 10 b to form an approximately radially directed pressing shoulder 11 .
Mindestens im Ausführungsbeispiel der Fig. 1 und 2 sowie der Variante gemäß Fig. 3 weicht der Flankenwinkel α des Schneidge windes 10 b vom Flankenwinkel β des Gewindesockels 10 a ab. Dabei ist dieser Flankenwinkel α des Schneidgewindes 10 b kleiner als der Flankenwinkel β des Gewindesockels 10 a. Beim Ausführungs beispiel der Fig. 1, 2 ist ausschließlich die dem Kopf 13 der Schraube zugewandte Flanke des Gewindeaufbaues 10 mit einer Preß schulter 11 versehen. Die preßschulterfreie Flanke weist im Bereich des Gewindesockels 10 a und des Schneidgewindes 10 b gleiche Neigung zur Achse e-e der Schraube auf. Zudem schließt die dem Kopf 13 zugewandte Flanke des Schneidgewindes 10 b zur Achse e-e der Schraube etwa einen rechten Winkel ein. Bei der Variante gemäß Fig. 3 sind auf dem Gewindesockel S zwei Schneidgewinde G; G′ vorgesehen, zwischen welchen die Preßschulter 11 angeordnet ist.At least in the embodiment of FIGS. 1 and 2 and the variant according to FIG. 3, the flank angle α of the cutting wind 10 b deviates from the flank angle β of the threaded base 10 a . This flank angle α of the cutting thread 10 b is smaller than the flank angle β of the threaded base 10 a . When execution of Figure 1, for example., 2 is solely the head of the screw 13 provide the facing flank of the thread structure 10 with a pressing shoulder 11. The flank without a shoulder has the same inclination to the axis ee of the screw in the area of the threaded base 10 a and the cutting thread 10 b . In addition, the flank of the cutting thread 10 b facing the head 13 encloses approximately a right angle to the axis ee of the screw. In the variant according to FIG. 3, two cutting threads G are on the threaded base S ; G 'is provided, between which the press shoulder 11 is arranged.
Für die Variante gemäß Fig. 4 ist charakteristisch, daß zwei das Schneidgewinde 10 b′ beidseits flankierende Preßschultern 11′ einen spitzen Winkel γ zum Mantel des Schaftes 12 der Schraube einschließen. Demzufolge weist die der Schraubenspitze zugewandte Flanke des Gewindesockels 10 a′ eine geringere Tiefe auf als die dem Kopf 13 der Schraube zugewandte Flanke.It is characteristic of the variant according to FIG. 4 that two cutting threads 10 b ' on both sides flanking press shoulders 11' enclose an acute angle γ to the jacket of the shank 12 of the screw. Accordingly, the flank of the threaded base 10 a ' facing the screw tip has a smaller depth than the flank facing the head 13 of the screw.
Bei der Variante gemäß Fig. 5 schließt die Mittelebene a-a des Gewindesockels 10 a′′ einen Winkel zu den durch die Mittelebene des Schneidgewindes 10 b′ gehenden Radialen c-c ein. In der Variante gemäß Fig. 6 stehen die Flanken des Gewindesockels 10 a′′′ bei fehlendem oder minimalem Flankenwinkel etwa senkrecht zum Mantel des Schaftes 12. In the variant according to FIG. 5, the central plane aa of the threaded base 10 a '' includes an angle to the radial cc going through the central plane of the cutting thread 10 b ' . In the variant according to FIG. 6, the flanks of the threaded base 10 a '''are approximately perpendicular to the casing of the shaft 12 in the absence or minimal flank angle.
In der Variante gemäß Fig. 3 schließen, wie im Beispiel der Fig. 1, 2, die der Schraubenspitze zugewandten Flanken von Gewinde sockel S und Schneidgewinde G′ einen gleich großen Winkel zur Achse e-e der Schraube ein.In the variant according to FIG. 3, as in the example of FIGS. 1, 2, the flanks of the thread base S and the cutting thread G ' facing the screw tip form an angle of the same size to the axis ee of the screw.
Claims (10)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19863615271 DE3615271A1 (en) | 1986-05-06 | 1986-05-06 | Screw for plastic expansion dowel |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19863615271 DE3615271A1 (en) | 1986-05-06 | 1986-05-06 | Screw for plastic expansion dowel |
Publications (1)
Publication Number | Publication Date |
---|---|
DE3615271A1 true DE3615271A1 (en) | 1987-11-12 |
Family
ID=6300268
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19863615271 Withdrawn DE3615271A1 (en) | 1986-05-06 | 1986-05-06 | Screw for plastic expansion dowel |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE3615271A1 (en) |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1992010688A1 (en) * | 1990-12-14 | 1992-06-25 | Charles Bickford | Improved fixing |
EP0713017A2 (en) * | 1994-11-04 | 1996-05-22 | Berner GmbH | Self-tapping screw |
DE19732652A1 (en) * | 1997-07-29 | 1999-02-04 | Ejot Verbindungstech Gmbh & Co | Cold-rolled self-tapping screw for screwing into plastics |
US6158939A (en) * | 1997-07-29 | 2000-12-12 | Ejot Verbindungstechnik Gmbh & Co. Kg | Self tapping screw |
WO2001044672A1 (en) | 1999-12-14 | 2001-06-21 | Ejot Verbindungstechnik Gmbh & Co. Kg | Self-threading screw |
US6394726B1 (en) * | 2000-05-31 | 2002-05-28 | Illinois Tool Works Inc. | Threaded fastener |
DE102005003997B3 (en) * | 2005-01-27 | 2006-08-31 | Marks, Thomas, Dipl.-Ing. | Sand dowel, as an anchor for a screw within a drilling in solid materials, has an inner sliding layer to reduce friction between the screw and the dowel sand and act as a screw bond |
EP3040563A1 (en) * | 2015-01-05 | 2016-07-06 | Adolf Würth GmbH & Co. KG | Screw with discontinuity at the section between threads |
EP2580486A4 (en) * | 2010-06-10 | 2017-05-24 | GRK Canada Limited | Screw with dual edge on thread |
CN108403235A (en) * | 2018-03-27 | 2018-08-17 | 北京莱顿生物材料有限公司 | A kind of mouth cavity planting body and mouth cavity planting body component |
DE102020106119B3 (en) | 2020-03-06 | 2021-09-09 | Günter Weippert | screw |
-
1986
- 1986-05-06 DE DE19863615271 patent/DE3615271A1/en not_active Withdrawn
Cited By (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1992010688A1 (en) * | 1990-12-14 | 1992-06-25 | Charles Bickford | Improved fixing |
EP0713017A2 (en) * | 1994-11-04 | 1996-05-22 | Berner GmbH | Self-tapping screw |
EP0713017A3 (en) * | 1994-11-04 | 1996-06-12 | Berner Gmbh | |
US6604901B1 (en) | 1997-07-29 | 2003-08-12 | Ejot Verbindungstechnik Gmbh & Co. | Self tapping screw |
US6158939A (en) * | 1997-07-29 | 2000-12-12 | Ejot Verbindungstechnik Gmbh & Co. Kg | Self tapping screw |
DE19732652A1 (en) * | 1997-07-29 | 1999-02-04 | Ejot Verbindungstech Gmbh & Co | Cold-rolled self-tapping screw for screwing into plastics |
WO2001044672A1 (en) | 1999-12-14 | 2001-06-21 | Ejot Verbindungstechnik Gmbh & Co. Kg | Self-threading screw |
DE19960287C1 (en) * | 1999-12-14 | 2001-07-26 | Ejot Verbindungstech Gmbh & Co | Self-tapping screw |
US6394726B1 (en) * | 2000-05-31 | 2002-05-28 | Illinois Tool Works Inc. | Threaded fastener |
DE102005003997B3 (en) * | 2005-01-27 | 2006-08-31 | Marks, Thomas, Dipl.-Ing. | Sand dowel, as an anchor for a screw within a drilling in solid materials, has an inner sliding layer to reduce friction between the screw and the dowel sand and act as a screw bond |
EP2580486A4 (en) * | 2010-06-10 | 2017-05-24 | GRK Canada Limited | Screw with dual edge on thread |
EP3040563A1 (en) * | 2015-01-05 | 2016-07-06 | Adolf Würth GmbH & Co. KG | Screw with discontinuity at the section between threads |
EP3719330A1 (en) * | 2015-01-05 | 2020-10-07 | Adolf Würth GmbH & Co. KG | Screw with discontinuity at the section between threads |
CN108403235A (en) * | 2018-03-27 | 2018-08-17 | 北京莱顿生物材料有限公司 | A kind of mouth cavity planting body and mouth cavity planting body component |
CN108403235B (en) * | 2018-03-27 | 2020-05-15 | 北京莱顿生物材料有限公司 | Oral implant and oral implant assembly |
DE102020106119B3 (en) | 2020-03-06 | 2021-09-09 | Günter Weippert | screw |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
8139 | Disposal/non-payment of the annual fee |