DE1652806C

DE1652806C - Taps

Info

Publication number: DE1652806C
Application number: DE19681652806
Authority: DE
Inventors: Der Anmelder Ist
Original assignee: Individual
Current assignee: Individual
Priority date: 1968-03-14
Filing date: 1968-03-14
Publication date: 1973-07-26

Description

entfernt werden können. Andererseits ist das Schneidteil nicht so leicht lösbar, da es während des Bohrvorgangs in das Material eingeschraubt worden ist. Es läßt sich aber mit Hilfe eines an die flachen am Schneidteil 4 vorgesehenen Flächen 6 anzusetzenden Schraubenschlüssel verhältnismäßig leicht ausdrehen. can be removed. On the other hand, the cutting part is not so easily detachable because it is during the Drilling operation has been screwed into the material. But it can be attached to the flat with the help of one Unscrew the wrench to be applied relatively easily on the surfaces 6 provided on the cutting part 4.

Ersetzt man das Kupplungsstück 7 durch ein neues und verbindet Schaftteil 1 und Schneidteil 4 wieder fest miteinander, dann kann der Gewindebohrvorgang sofort wieder aufgenommen werden, denn das Auswechseln läßt sich sehr rasch durchführen. The coupling piece 7 is replaced by a new one and the shaft part 1 and cutting part 4 are connected firmly together again, then the tapping process can be resumed immediately, because the replacement can be carried out very quickly.

Bei der Ausführungsform nach Fig.2 ist ein Kupplungsstück 9 an seinem Umfang mit einem Außengewinde versehen. Am Ende des Schaftteils 1 und des Schneidteils 4 ist jeweils eine mit Gewinde versehene Bohrung 10 bzw. 11 vorgesehen zur Aufnahme des Außengewindes des Kupplungsstücks 9. Auch in diesem Fall bricht das Kupplungsstück bei übermäßiger Beanspruchung während des Bohrvorgangs in der Mitte. Um das Lösen der Teile des zerbrochenen Kupplungsstücks 9 zu erleichtern, bildet man es vorzugsweise mit einer im Querschnitt vielckkigen, d. h. vier- oder sechseckigen Mittelbohrung 12 aus, so daß sich das Kupplungsstück 9 mittels eines in diese Bohrung einzusetzenden vielkantigen Stabs leicht herausdrehen läßt. Diese Anordnung ist jedoch nicht zwingend erforderlich, da die zerbrochene Kupplung doch ziemlich lose sitzt und leicht nu entfernen ist.In the embodiment of Figure 2 is a Coupling piece 9 provided on its circumference with an external thread. At the end of the shaft part 1 and the cutting part 4 is provided with a threaded bore 10 or 11 for receiving it of the external thread of the coupling piece 9. In this case too, the coupling piece breaks excessive stress during drilling in the center. To solve the parts of the broken To facilitate coupling piece 9, it is preferably formed with a polygonal cross-section, d. H. square or hexagonal central bore 12, so that the coupling piece 9 by means of a in this hole to be inserted polygonal rod can be easily unscrewed. However, this arrangement is not absolutely necessary, as the broken coupling is rather loose and easy to remove is.

In F i g. 3 ist ein Gewindebohrer dargestellt, weleher einen einstückig an das eine Ende des Schafts 24 angeformten bogenförmigen Abschnitt 13 aufweist. Die Verbindungsvorrichtung für den Schaft 14 und das Schneidteil 4 ist mit der nach F i g. 1 identic, d. I₁., uas Schaftteil 14 und das Schneidteil 4 werden mittels eines Kupplungsstücks 7 zusammengefügt. In diesem Fall sind jedoch am unteren Schaftende parallele Flächen 15 zur Aufnahme eines Schraubenschlüssels vorgesehen, welche den Flächen 6 des Schneidteils 4 entsprechen. Seibstverao ständlich kann auch bei i ι g. 3 die Verbindung von Schaftteil und Schneidteil mittels eines Kupplungsstücks 9 mit einem Außengewinde gemäß F i g. 2 erfolgen. In Fig. 3 shows a tap which has an arcuate section 13 formed integrally on one end of the shaft 24. The connecting device for the shaft 14 and the cutting part 4 is similar to that shown in FIG. 1 identic, d. I _1. , Including the shaft part 14 and the cutting part 4 are joined together by means of a coupling piece 7. In this case, however, parallel surfaces 15 for receiving a wrench are provided on the lower end of the shank, which correspond to the surfaces 6 of the cutting part 4. Seibstverao of course can also with i ι g. 3 the connection of the shaft part and the cutting part by means of a coupling piece 9 with an external thread according to FIG. 2 take place.

Hierzu 1 Blatt Zeichnungen1 sheet of drawings

Claims

Manufacture of the coupling parts no significant claims: Requiring costs, the use effect of the tap according to the invention is compared to the

1. Taps with cutting part and shank-known taps much higher.

part, as well as one in the transition area as a target 5 In the following, the invention is based on the in

breaking point attached annular groove, thereby the drawing illustrated embodiments

characterized in that the shaft part (1) and described in more detail. In the drawing shows

the cutting part (4) in a manner known per se F i g. 1 is a side view of a tap

via a coupling piece by means of thread releasable with straight shank or cutting part, which by means of

are connected to one another, this coupling being shown in section according to the invention

Lung piece (7) are designed in the shape of a sleeve and connected to the coupling piece,

the annular groove (8) is provided. F i g. 2 a longitudinal section through a somewhat

2. Tap according to claim 1, characterized by converted execution of the coupling piece characterized in that the at the end of the shaft part Fig. 1,

(1) or the cutting part (4) provided Ge 15 F i g. 3 a side view of a thread on a

threads (2, 5) are external threads, whereby the debuger with a curved shaft is inventively

Coupling piece (7) a coupling piece according to the invention with the external threads.

(2, 5) cooperating internal thread as shown in FIG. 1 can be seen, the shaft part I of the

shows. Tap at one end with a

3. Tap according to claim 1, characterized in that the outer thread 2 with a slightly smaller diameter is formed at the end of the shaft part and at its other end with a square 3 (1) or the cutting part (4). The cutting part 4 of the tap has internal threads (10, 11), which is provided at its lower end with a Ge coupling piece (9) with an external thread identical to the internal thread2 and with thread ^r . (10, 11) cooperating external thread 25 is provided with a pair of flat, parallel and slightly recessed threads. Areas 6, which are also used to accommodate a

Use a wrench.

The coupling piece 7 is sleeve-shaped

det and with one with the external threads 2 and 5

30 cooperating internal thread provided. Around the circumferential center of the coupling piece 7 is a

The invention relates to a tap with an annular groove 8.

Cutting part and shaft part as well as one in the transition The external thread 2 of the shaft part 1 and the

ring groove attached partly as a predetermined breaking point. The external thread of the cutting part4 is

There are already taps with a cutting part inserted into the coupling piece 7 at the ends and a shaft part that screws over Uberla- until the ends of the external threads 2 and 5 Stungteil are connected to each other, known to lie against each other, and shaft part 1 and cutting part 4 (U.S. Patent 2740974). These known are then firmly connected to each other. The directions of rotation If the stresses on the external threads 2 and 5 are too great, taps should each be of this type Claim of the tap when drilling the 4 ° provided that both the shaft part 1 and Break the overload part. A disadvantage of this form is the cutting part 4 under the action of the rotary guide is, however, that such a tap screw into the coupling piece 7 force. Up there After the transition part has broken, the shaft part 1 and the cutting part 4 are no longer fixed in this way can be used to form a unit, this results in the-

The object on which the invention is based is the same drilling performance as with a conventional one now to avoid this disadvantage and use lumpy taps. The external threads 2 If the shank part breaks, the cutting part will revolve and rotate into the during the drilling process to be able to use. Coupling piece 7 into it, the pressure between

To solve this problem, the shaft part and the ends of the external threads 2 and 5 are axially the cutting part exerts in a manner known per se via a train on the coupling piece 7; with a normal coupling piece by means of a thread detachable drilling load breaks, however, the coupling piece 7 connected, whereby this coupling piece is not sleeved,
is formed mig and provided with the annular groove. However, if a during the drilling process

In a further embodiment of the invention, the extraordinary load torque that occurs is increased The tensile force acting on the coupling piece 7 is provided at the end of the shaft part or of the cutting part nen thread external thread, whereby the coupling accordingly, and finally this breaks, wähstück a shaft part 1 and cutting part 4 cooperating with the external threads remain undamaged Internal thread has ben.

Finally, it is proposed according to the invention that the coupling piece 7 on its circumferential

that the center at the end of the shaft or cutting part with an annular groove 8, as seen in the drawing Threads are internal threads, where this is interpreted, provided, the break occurs with certainty Coupling piece with an internal thread at this particularly weak point. The Kupp interacting External thread is provided. treatment piece 7 would also without an annular groove about in the

After unscrewing the two parts of the broken middle break, because the tensile force at this point is on NEN coupling piece from the shaft part and the 65 strongest comes to work

Cutting part and re-screwing a new coupling If the coupling piece 7 is broken, the

lungsstückes is the tap without a large tensile force acting on it, so that the parts Time expended fully accessible again. Since that of the broken coupling piece easily