DE1257002B - Insert for a threaded end of a pipe to be bent with a bending tool - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. CL:

B21d

German class: 49 h -17/01

Number: 1257002

File number: F 444561 b / 49 h

Filing date: November 17, 1964

Opened on: December 21, 1967

The invention relates to an insert for a threaded end of a Bending tool to be bent pipe with a core protruding into the pipe end and a Threaded sleeve that can be screwed onto the pipe end with points on the outside for the attack of the bending tool.

In a known insert, the threaded sleeve and the core arranged therein form together a one-piece body, the free end of the sleeve part in the same plane with the free end of the core part. The core part fits into the pipe to be bent with a great deal of play and is not longer designed as the threaded sleeve. Despite the play, however, the core will jam when bending of the pipe is not completely avoided, and there is also the risk that the thread in the area of the free End of the core becomes out of round during bending. This means that when you unscrew the insert bent tube exposed to torsional stress, which often leads to the tearing of the threaded part leads from the pipe.

The invention has a substantial reduction in torsional stress on the bent tube when unscrewing the insert to the goal. This aim is achieved according to the invention in that the core and the sleeve are separate bodies, the core being rotatable and axially slidable in the sleeve stored and in its inner position in the sleeve by a shoulder opposite the Sleeve is limited.

When unscrewing the threaded sleeve from the thread of the bent pipe needs the on his Free end face located in the tube core not to be rotated. The core is through axial Move according to the pitch of the thread pulled out of the bent tube. Through this excessive stress on the thread at the end of the pipe is avoided. The core can get fed up with that be used to be bent tube, so that the risk is effectively countered, the thread on his to deform the pipe facing part when bending.

A further development of the invention consists in that the core in its inner position protrudes inwardly beyond the sleeve and preferably also the thread of the pipe. A correspondingly long core has the advantage that the bending radius of the pipe only begins at a distance from the threaded sleeve and possibly also at a distance from the thread of the pipe, whereby stresses are exerted on the part of the insert carrying the threaded sleeve for a threaded sleeve
End one with a bending tool too
bending pipe

Applicant:

Amerigo Fantini, Paris
Representative:
ίο Dipl.-Ing. H. Fink, patent attorney,

Eßlingen / Neckar, Hindenburgstr. 44

Named as inventor:
Amerigo Fantini, Paris

Claimed priority:

France of November 19, 1963 (954289) -

Pipe and possibly also be kept away from its thread.
The invention is described below with reference to an embodiment which is shown as an example in the drawing. It shows

F i g. 1 shows a longitudinal section through a threaded sleeve of an insert,
F i g. 2 is a side view of a core of the insert;

Fig. 3 is a longitudinal section through the from the parts according to F i g. 1 and 2 assembled insert in an already bent end of a pipe with an end-side thread.

A threaded sleeve 1 has a smooth, axial bore 3 and a coaxial internal thread at one of its ends 4. The sleeve 1 has on its outside two flats 2, which are used for the attack Bending tool are provided.

A cylindrical core 5, the diameter of which corresponds to that of the smooth bore 3 of the sleeve 1, has a shoulder 6 at one end.

In the operating position, the internal thread 4 of the threaded sleeve 1 is attached to an end 8 provided with a thread of the tube 7 and screwed the free end of the core 5 into the sleeve 1 and the end of the to be bent Tube 7 inserted. The shoulder 6 of the core 5 lies against that of the internal thread 4 removed outer part of the threaded sleeve 1.

A provided with the existing from the sleeve 1 and the core 5 tube 7 can be in a known bending tool, e.g. B. with the help of a

709 709/272

Claims (1)

Screw spindle or a working cylinder, can be bent cold. Since the core 5 protrudes beyond the internal thread 4 of the threaded sleeve 1, the bend begins at a distance of the thread located at the end 8 of the tube 7, which is why this is spared. It's because of the axial force exerted by the threaded sleeve 1 on the shoulder 6 of the core 5 is also slight, to pull the core 5 out of the end 8 of the tube 7 when the threaded sleeve 1 is unscrewed. the the force required for this is in proportion to that covered by the sleeve on the circumference of the thread Way less. Patent claims: - 1. Use for a threaded end of one with a bending tool too bending pipe with a core protruding into the pipe end and one on the Pipe end screw-on threaded sleeve with points on the outside for the attack of the Bending tool, characterized in that the core (5) and the sleeve (1) are separate Body are, the core in the sleeve rotatably and axially displaceably mounted and in its inner position in the sleeve is limited by a shoulder (6) opposite the sleeve. 2. Use according to claim 1, characterized in that the core (5) in its inner position the sleeve (1) and preferably also the thread (8) of the tube (7) protrudes inwardly. Considered publications:
French patent specification No. 1 320 052. 1 sheet of drawings 709 709/972 12.67 G Bundesdruckerei Berlin