WO2006007992A1

WO2006007992A1 - Threaded element

Info

Publication number: WO2006007992A1
Application number: PCT/EP2005/007385
Authority: WO
Inventors: Roland Mair
Original assignee: Sfs Intec Holding Ag
Priority date: 2004-07-15
Filing date: 2005-07-08
Publication date: 2006-01-26
Also published as: DE102004034245A1

Abstract

The invention relates to a threaded element (1) comprising a shaft which is provided, at least partially, with a covering (4) on at least one threaded section (11). The threaded section (11) comprises at least one groove (3), notch, channel or similar, which crosses said thread (2). Said threaded section (11) is provided, at least in a partial area of the thread (2) comprising a groove (3), notch, channel or similar, with an adhesive and/or blocking coating (4) or similar.

Description

Applicant: SFS intec Holding AG, CH-9435 Heerbrugg (Switzerland)

Item: Threaded element

description

The invention relates to a threaded element with a shaft with at least one, at least partially, provided with a coating thread.

Threaded elements of the type mentioned are known for various special applications.

The object of the invention is to design a threaded element in such a way that, in particular with thin metal sheets, a reverse rotation lock is achieved between at least one metal sheet and the threaded element.

This is achieved according to the invention in that the threaded portion has at least one groove, notch, groove or the like crossing the thread, at least a portion of the thread provided with the groove, notch, groove or the like having an adhesive and / or clamping coating od. Like. Is provided.

By filling the groove, notch, groove or the like with an adhesive, clamping coating or the like, an optimum positive connection between the threaded element and the metal sheet is achieved. The filled with coating material groove, notch, groove od. Like. Increased even with thin sheets after a short solidification time in addition to the effect of the groove, notch, groove od. Like. Even the self-locking effect of the compound. The result is an extremely high-quality front and rear reversal protection. The application of the coating can be done in very different ways. In addition to the usual Auf¬ from the outside to a threaded portion, it is also possible through an axial bore with one or more radial holes at the thread height, for example by a cartridge with coating material, while resp. after entering Beschich¬ processing material in the grooves, notches, grooves od. Like. Resp. inject the thread. In one embodiment of the threaded element forms the groove, notch, groove od. Like. U-, V-, trapezoidal or in another cavity-forming form in the thread flank, bays. This makes it possible to enclose coating material between the inner and outer threads during insertion. As a result of the entanglement, coating material is continuously "smeared" onto the thread by this coating material and thus gradually distributed optimally on the surface. For very thin sheets, the coating material can also remain in the cavity and "sticks" threaded element and sheet together after a short drying time. By a non-symmetrical shaping of the cavity, the resp. Reverse an unter¬ different torque can be achieved.

In a further embodiment, the threaded element is characterized in that a plurality of grooves, notches, grooves od. Like. Are attached. With this duplication, the effect of the grooves, notches, grooves od. Like. Be multiplied.

In a further embodiment of the threaded element, the groove, notch, groove od. Like. Axially parallel to the shaft. Thus, the rolling tools can be manufactured easily and keep their wear low.

In a further embodiment of the threaded element, the groove, notch, groove od. Like. Left and / or right-handed to the shaft. With these embodiments, the groove, notch, groove od. Like. Be specifically adapted to the application, so that an opti¬ times groove, notch, groove od. Like. Is formed for a particular application. Particularly advantageous is a right-handed groove, notch, groove od. Like. With a low slope. In this embodiment, a sharp and an obtuse angle in the thread are generated by the thread crossing groove, notch, groove od. Like. The acute angle leads to a higher return torque of the screw and the obtuse angle reduces the milling of the sheet and therefore increases the tightening forces of the screw.

In a further embodiment of the threaded element, the groove, notch, groove od. Like. Preferably in the depth of the thread core diameter, executed. This results in a relatively large groove, notch, groove od. Like., Offers the bays with a lot of volume for the introduction of coating material. The production of such a groove, notch, groove od. Like. Is also simple. In particular, the depth of the produced groove, notch, groove od. Like. Of eye visible, so that low test costs arise. The cutting edge crossing the thread reaches the maximum edge length, which alone leads to a maximum mechanical anti-twist protection.

In a further embodiment of the threaded element, the groove, notch, groove od. Like. Run deeper than the thread core diameter. For cases in which a lot of coating material must be introduced, so creates a very large cavity.

In a further embodiment of the threaded element, the groove, notch, groove od. Like. Running along the shaft of different depths. Thus, the grooves, notches, grooves od. Like. Can be made deepened where the application has the greatest benefit. Zones that are less relevant can be designed with or without a smaller groove depth.

In a further embodiment of the threaded element, the coating is a two-component adhesive od. Like. It can be achieved that the adhesive is activated only when distributing to the two rubbing threaded surfaces.

In a further embodiment of the threaded element, the coating of plastic od. Like. By filling the cavities of the groove, notch, groove od. Like. High friction during rotation of the thread and thus a good rotation can be achieved.

In a further embodiment of the threaded element, the coating consists of an oiling or greasing liquid, wax or a layer of polytetrafluoroethylene (PTFE) or the like. By means of this coating, the insertion torque can be reduced in particular when starting the thread, oiling or greasing liquids can but also in the groove, notch, groove od. Like. Are introduced to prevent the attachment to a permanent connection, for example through aging, will. This prevents corrosion and cold welding.

In a further embodiment of the threaded element, the coating is applied partially or on the entire circumference. Already with a partial coating in the region of the groove, notch, groove od. Like. On the thread, the connection can be maximally secured against reverse rotation. The application to the rest of the thread on the circumference is therefore made mainly to ensure with little effort that the coating was there attached to the circumference, where the groove, notch, groove od. Like. In the thread is appropriate. With several grooves, notches, grooves od. Like. Also, only one or more grooves, notches, grooves od. Like. Partially coated.

In a further embodiment of the threaded element, one or more threaded portions are attached. This makes it possible to prevent mixing of the oil-end coating and the adhesive coating. The region lying between the threaded sections may correspond to the blank diameter, the core diameter or a freely selected diameter of a recess. It is thus also possible to use a plurality of coating materials. It is obvious that for screwing in the threaded element, an oil-immersing coating facilitates the operation and, in a further partial coating, an adhesive coating in the region of the contact points between the threaded element and the threaded bore produces a reverse-rotation-proof connection.

In a further embodiment of the threaded element, the groove, notch, groove od. Like. Running over several threaded sections. Thus, the rolling tool can be designed in a simple way.

In a further embodiment of the threaded element, a self-drilling, selbstein¬ urgent or centering tip is mounted in an embodiment as a screw on the side facing away from the rotary attack. With this embodiment, a vorgela¬ Gerter separate operation for the production of the bore can be avoided or min¬ least with little effort centering of the two holes can be achieved. The bore diameter is optimally matched to the threaded element. The compound is produced particularly efficiently.

In a further embodiment of the threaded element, a head element with a rotary handle is attached to one end region of the thread. The rotary handle is necessary to allow a Eingewinden. Depending on the application, any head variant which is capable of transmitting the necessary torque by means of a torque attack can be selected from the head elements known to those skilled in the art. The head shape can therefore be of any desired design. Possible shapes are, in particular, the set screw, the countersunk head, cylinder head screws and screws with aesthetic heads and an attack under the head. In a further embodiment of the threaded element, the shaft-side shaft section which adjoins the thread is designed to be thread-free. In the case of connections of at least two sheets, it is thus made possible for the sheet metal facing away from the threaded element to be over-twisted in the threaded element, thereby preventing "grabbing" during reverse rotation. Thus even a non-positive connection is secured against loosening. The lateral forces are still transmitted very well by this connection.

In a further embodiment of the threaded element of the thread on¬ closing head-side shaft portion is formed as a recess. This punctured shaft region can also be used to prevent the threaded element from turning back, e.g. in a sheet to prevent, because it can no longer engage in the thread. The reduction in cross section results in a clearer separation between the borehole in the sheet metal and the threaded element.

It is also proposed that the thread of the threaded element is self-forming. This allows the threaded element form a thread into the bore without upstream operation. The bore can be optimally matched to the mounting in diameter. The threaded element in the form of a screw is automatically centered by the integrated drilling process.

It is also proposed that the thread of the threaded element is self-tapping. Thus, the threaded element can cut a thread into the bore without upstream operation.

Embodiments of the invention are explained in more detail below with reference to the drawings. Show it:

Fig. 1 shows a first embodiment of a threaded element;

Fig. 2 shows a mounting variant "pre-drilled" in two thin sheets;

3 a fastening variant "pre-drilled" with partially coated threaded element;

4 shows a variant of a self-drilling screw. Fig. 5 is a section along the line V - V in Fig. 4; and

Fig. 6 shows a mounting variant "self-drilling" in two sheets.

A threaded element 1 shown in FIG. 1 has a groove 3, notch, groove or the like 3 crossing the thread 2 with an adhesive and / or clamping coating 4 or the like. At least a portion of the groove 3, notch, groove or the like is provided with a coating 4.

In an embodiment variant according to FIG. 2, the threaded element has a plurality of grooves 3, notches, grooves od. Like., Which are designed to have different depths along the shaft. The coating 4 consists of a two-component adhesive or the like or consists of plastic or the like. Likewise, an oiling or greasing liquid, wax or a layer of polytetrafluoroethylene (PTFE) or the like can be applied as the coating 4 be. The thread-2 subsequent, head-side portion of the shaft 6 is formed gewin¬ defrei and can also be formed as a recess with a smaller diameter than the blank diameter.

In a further embodiment, Fig. 3, the grooves 3, notches, grooves od. Like. Run clockwise to the shaft. The grooves 3, notches, grooves od. Like. But can also be performed axially parallel or anti-clockwise. The coating 4 can also be applied only partially on the entire circumference. This makes a minimal application of coating material possible. The coating material is thus applied only at the point at which the groove 3, notch, groove od. Like., After mounting in engagement with the internal threads of the sheets 10 to be fastened.

In a further embodiment, Fig. 4 shows a self-drilling screw 7 with the inventive features groove 3, notch groove od. Like. And coating 4. The attached to one end portion of the thread 2 head element 9 serves as a rotary handle for driving the threaded element, which by a at the side facing away from the rotary handle abgewand¬ th self-drilling, selbststeindringende or centering tip 12 allows the Bohrrotation and a Eingewinden.

In a further illustration, FIG. 5 shows a section along the line V - V in FIG. 4. In this case, the groove 3, notch, groove od. Like., Notch, groove od. Like. U-, V-, trapezoidal or in another cavity-forming form, in the thread flute, the bays bil¬ det, pronounced. The groove 3, notch, groove or the like is preferably formed in the depth of the threaded core diameter DK.

In a further embodiment, the use of a self-tapping or self-tapping embodiment is shown in FIG. As a result of the self-forming or self-cutting design of the thread, the screw 7 can pierce the metal sheets 10 to be fixed in one operation, form or cut a thread 2 and engage with the groove 3 crossing the thread, notch, groove or the like see ver¬ with a coating 4, secure against rotation.

Other designs may consist of several threaded sections. Between the thread sections, a thread-free shank section can help to separate a mixture of an oil-end, lubricating coating, which may help to reduce the Einform¬ moments, with an adhesive, respectively clamping coating on the following thread element. Thus the effect is not impaired by mixing with the oiling liquid. For reasons of production, the groove, notch, groove or the like can also be guided without any problems over a plurality of threaded elements.

Claims

claims

Threaded element having a shaft with at least one, at least partially provided with a coating thread, characterized in that the threaded portion (11) od at least one thread crossing groove (3), notch, groove od. Like., Wherein at least a portion the od with the groove (3), notch, groove od. Like. Provided thread (2) with an adhesive and / or clamping coating (4) od. Like. Is provided.

2. Threaded element according to claim 1, characterized in that the groove (3), Ker¬ be, groove od. Like. U-, V-, trapezoidal or forms in another cavity-forming shape in the thread flute bays (5).

3. Threaded element according to claim 1 or 2, characterized in that a plurality of grooves (3), notches, grooves od. Like. Are attached.

4. Threaded element according to one of claims 1 to 3, characterized in that the groove (3), notch, groove od. Like. Axially parallel to the shaft is executed.

5. Threaded element according to one of claims 1 to 3, characterized in that the groove (3), notch, groove od. Like. Left and / or right-handed runs to the shaft.

6. Threaded element according to one of claims 1 to 5, characterized in that the groove (3), notch, groove od. Like. Preferably in the depth of Gewindekern¬ diameter (DK), are executed.

7. Threaded element according to one of claims 1 to 5, characterized in that the groove (3), notch, groove od. Like. Lower than the thread core diameter (DK) is executed.

8. Threaded element according to one of claims 1 to 7, characterized in that the groove (3), notch, groove od. Like. Along the shaft is guided at different depths aus¬.

9. Threaded element according to one of claims 1 to 8, characterized in that the coating (4) od a two-component adhesive. Like.

10. Threaded element according to one of claims 1 to 8, characterized in that the coating (4) made of plastic od. Like.

11. Threaded element according to one of claims 1 to 8, characterized in that the coating (4) of an oiling or greasing liquid, wax or a layer of polytetrafluoroethylene (PTFE) od. Like. There.

12. Threaded element according to one of claims 1 to 11, characterized in that the coating (4) is mounted partially or on the entire circumference.

13. Threaded element according to one of claims 1 to 12, characterized in that one or more threaded portions (11) are mounted on the shaft.

14. Threaded element according to claim 13, characterized in that the groove (3) is executed Ü over a plurality of threaded portions (11).

15. Threaded element according to one of claims 1 to 14, characterized in that on the head element (9) facing away from the side of the shaft a selbstboh¬ rende, self-penetrating or centering tip (12) is mounted.

16. Threaded element according to one of claims 1 to 15, characterized in that at one end of the shaft provided with at least one thread, a head element (9) is mounted with a rotary handle.

17. Threaded element according to claim 16, characterized in that the adjoining the thread head-side portion (6) of the shaft is formed thread-free ausge¬.

18. Threaded element according to claim 16, characterized in that the adjoining the thread head-side portion (6) of the shaft is formed as a recess ausge¬.

19. Threaded element according to one of claims 1 to 18, characterized in that the threaded portion (11) is designed self-forming.

20. Threaded element according to one of claims 1 to 18, characterized in that the threaded portion (11) is designed self-tapping.