EP0191728A1 - Device for the insertion of a pipe reinforcement - Google Patents

Abstract

The device according to the invention allows pressing by simple means of a tube fitting (16) into a tube (10), without the risk of damaging the tube core. A drawing set is arranged at a distance (L) from the end of the tube and is in non-positive engagement with the tube (10). An insertion ring comprising at least three insertion segments (32) covers the end face of the tube fitting (16) to be pressed into the tube (10). The insertion ring has a smooth cone (34) slightly tapered in the direction in which it is pressed in, the cone being adapted to be partially inserted into the tube, and an annular stop surface (60) for the tube fitting (16). A pressure plate (36) serves as an abutment for the tube fitting (16) during the pressing process into the tube (10). The device is used, for example, for reinforcing low pressure tubes for the food and drink industry or for the chemical industry. <IMAGE>

Description

The invention relates to a device for pressing a hose fitting into a hose on one or both sides.

Hoses used in the industrial sector, in particular low-pressure hoses with a large diameter, are generally thick-walled and preferably reinforced with a fibrous material with high tensile strength or high space pressure, such as textile, glass or carbon fibers. For this reason, it is often extremely difficult to attach the hose fittings.

Especially in the food and beverage industry there is a smooth transition between the. Hose core and the fitting desired, i.e. the inside diameter of the hose and the fitting are the same. This corresponds to the high hygienic demands of these industries. The immense widening of the hose in the fitting area creates holding forces which, depending on the pressure and the ratio of the nominal widths, make no or only a normal cover with two or three hose bands necessary.

However, if the hose needs to be widened considerably, there is always the risk that the hose core will be injured. The consequences of an injury to the inner tube can be devastating. In this way, microorganisms can nestle in the injured areas. These can hardly be removed by normal cleaning, which can lead to intolerable losses in the quality of the food or beverages.

For this reason, numerous attempts have already been made to improve the pressing of a hose fitting into a thick-walled, large-caliber hose.

According to DE-PS 32 29 691 and 32 29 692, a metal fitting and a multi-layer hose are interlocked or the hose is designed with high strength and low elasticity in the area of the fitting. Both types of production of reinforced hoses lead to good results, but can only be carried out with a relatively large amount of work and costs.

According to a further known variant, the hose fitting is pressed in by inserting a hose coupling set into the hose, a mandrel being arranged at a distance from the hose end. Then the hose is clamped in a vice at the level of the mandrel, whereby precautionary measures must be taken so that the hose is not injured. By turning a lever, the hose fitting is pulled into the hose by a threaded rod rotating in the mandrel. Apart from the fact that the fitting is not easily inserted into the hose, there is a great risk of injury to the hose core when it is pressed in.

The inventor has set himself the task of creating a device for pressing a hose fitting into a hose on one or both sides, which can certainly avoid injuries to the hose core, is easy to handle and requires little investment and labor.

• - eine in Abstand von dessen Ende mit dem Schlauch in kraftschlüssigem Eingriff stehende Ziehgarnitur,
• - einen in die Bohrung der Schlaucharmatur einsteckbaren, deren in den Schlauch eingepresste Stirnseite abdeckenden Einführungsring, der aus mindestens drei Einführungssegmenten besteht, welche einen sich in Einpressrichtung leicht verjüngenden, glatten Konus und eine ringförmig ausgebildete Anschlagfläche für die Schlaucharmatur haben, und
• - eine Druckplatte als Widerlager für die Schlaucharmatur bei deren Einpressen in den Schlauch.

According to the invention, the object is achieved by

• a drawing set which is non-positively engaged with the hose at a distance from its end,
• - An insertable into the bore of the hose fitting, the end face of which is pressed into the hose and which covers the insertion ring and which consists of at least three insertion segments elements exist, which have a slightly tapering in the pressing direction, smooth cone and an annular stop surface for the hose fitting, and
• - A pressure plate as an abutment for the hose fitting when it is pressed into the hose.

It is essential for the design of the drawing set that it can be anchored in the hose without causing the slightest injury to the hose core. Known drawing sets which meet these requirements are suitable for the device according to the invention, for example the above-mentioned mandrel inserted into the hose.

The drawing set preferably has a threaded rod with drive means which can be actuated clockwise and counterclockwise, in particular a crank which is rigidly connected to a locked nut and which is equipped with one or two lever arms and associated handles. In an industrial setting, the threaded rod can expediently also be driven by an electric motor with a corresponding gear, hydraulic or pneumatic means, and possibly also have control devices.

According to a first preferred embodiment, the clamping element of the drawing set can consist of a holding mandrel with a cylindrical outer surface, which rests on the inner surface of the hose, but can still be inserted easily and with little force. The holding mandrel is screwed onto the end of the threaded rod protruding into the hose and locked with a nut. In this way, the same threaded rod can be used for holding mandrels of different sizes, which is not necessary, but is inexpensive.

In the area of the holding mandrel, dimensionally stable plastic shells with an outside diameter of the hose are removed speaking bore so clamped that the holding mandrel can no longer slide even when using very large tensile forces.

The cylindrical outer surface of the holding mandrel preferably has fine knobs, a screw thread, a transverse grooving, a border or the like, which increase the sliding resistance in the longitudinal direction of the hose. The pressure force is expediently applied via two plastic shells with roughly square outer contours in the installed position. The two shells are each guided through bolts that pass through two bores, which may be designed as screws. The hose end can then be in a vise or by known means, e.g. Screw clamps are attached to a suitable base.

According to a second preferred embodiment, the clamping member consists of a hollow cylinder which is guided on the threaded rod but is freely movable and which consists of at least two segments which are expandable and held together by elastic means, the bore of this expanding mandrel resting on the threaded rod being rounded off at the end faces or . opens conically. A central cone nut with the tip in the direction of the expanding mandrel freely rotatable on the threaded rod, a second conical nut with the tip in the direction of the expanding mandrel fixed on the other side of the threaded rod by means of a counternut and the tip in the direction of the expanding mandrel form the centerpiece, the first Cone nut with frictional engagement with the bore of the expanding mandrel has the greater frictional resistance than the second cone nut.

The hollow cylinder, which acts as an expanding mandrel and is in positive engagement with the threaded rod, preferably divided into at least three identical segments is expediently held together by conventional rubber 0-rings arranged on the outer radius. In practice, it has proven useful to insert two 0-rings in the area of the end faces of the expanding mandrel in annular grooves.

The expanding mandrel can only develop its effect if - after inserting the expanding mandrel into the hose - when turning the threaded rod, the first cone nut does not turn due to the greater frictional resistance with the bore of the expanding mandrel, while the countered second conical nut glides on the bore of the expanding mandrel . The back pressure of the hose causes the expanding mandrel to expand regularly over its entire length, i.e. the two cone nuts are pulled into the hole to the same extent.

• - Der Kegelmantel der ersten Konusmutter und/oder die entsprechende Kontaktfläche des Spreizdorns haben eine rauhe oder aufgerauhte - z.B. durch Längsrillen, Noppen oder dgl. - Oberfläche, wodurch ein grosser Reibungswiderstand entsteht. Der Kegelmantel der gekonterten zweiten Konusmutter und/oder die entsprechende Kontaktfläche des Spreizdorns dagegen sind fein oder geschliffen ausgebildet.
• - Mindestens der Kegelmantel der gekonterten zweiten Konusmutter besteht aus einem auf der Kontaktfläche des Spreizdorns besser gleitenden Material. Der Kegelmantel kann auch mit einem eine bessere Gleitfähigkeit vermittelnden Material beschichtet sein, wobei jedoch darauf geachtet werden muss, dass dieses Beschichtungsmaterial - bei Verwendung des mit einer bzw. zwei Armatur/en versehenen Schlauches in der Lebensmittel bzw. Getränkeindustrie - lebensmittelverträglich ist.
• - Als in bezug auf die Wirtschaftlichkeit besonders vorteilhafte Lösung hat sich herausgestellt, die erste Konusmutter und den Spreizdorn aus Stahl, die gekonterte zweite Konusmutter dagegen aus Messing herzustellen.

The different frictional resistance of the cone shells of the two conical nuts with the corresponding rounding or conical opening of the bore of the expanding mandrel is achieved, for example, by the following measures:

• - The conical jacket of the first conical nut and / or the corresponding contact surface of the expanding mandrel have a rough or roughened surface, for example due to longitudinal grooves, knobs or the like, which creates a large frictional resistance. The conical surface of the countered second cone nut and / or the corresponding contact surface of the expanding mandrel, on the other hand, are fine or ground.
• - At least the conical jacket of the countered second cone nut consists of a material that glides better on the contact surface of the expanding mandrel. The cone jacket can also be coated with a material that provides better lubricity, but care must be taken to ensure that this coating material - when using the hose with one or two fittings in the food or beverage industry - is food compatible.
• - It turned out to be a particularly advantageous solution in terms of economic viability to manufacture the first cone nut and expanding mandrel from steel, and the countered second cone nut from brass.

The outside diameter of the relaxed holding or expanding mandrel inserted into the hose is dimensioned such that it touches the inner surface of the hose, but without any significant resistance. The clear width of the hoses is preferably adapted to DIN standard 11 854 for hose screw connections. An assortment of expanding mandrels can therefore be created which corresponds to these DIN standards.

The insertion segments essential for the successful use of the device according to the invention ensure that the hose fitting can be pressed into the hose in all variants of drawing sets without damaging the hose core. The diameter of the end face of the insertion segments pointing in the direction of the hose is preferably slightly smaller than the inside diameter of the hose. The hose end hits the cone surface when the hose fitting equipped with the insertion segments is inserted, expands continuously when pressed in and can slide over the hose fitting up to a stop without risk of injury to the hose core.

The end faces of the insertion segments pointing in the direction of the support plate can have a bore which is arranged in the middle of the end face. In this hole After removing the pull set, an appropriate auxiliary rod can be inserted and an insertion segment can be knocked out.

To simplify the manipulations necessary with the reinforcement of hoses, two correspondingly dimensioned plastic shells can be screwed onto the area after the expansion mandrel inserted into the hose has been expanded. For example, the hose can be anchored in a vice or screwed onto another suitable base or attached in some other way.

In general, the thick-walled hoses, usually provided with reinforcing inserts, e.g. With nominal widths of 40, 50, 65 and 80 mm, sufficiently rigid to press in a hose fitting. With thin-walled and / or flexible hoses, however, a bellows can form when pressed in, which complicates or makes it impossible to install a hose fitting. In this case, at least three, preferably four, holes are cut out adjacent to the hose end, which holes serve to accommodate hose supports that act as spacers. These are held in clamping shells, preferably identical to the plastic shells mentioned above. The holes, which are regularly distributed over the circumference of the hose, are expediently left out at the point where the first hose band will be attached later.

For the components of the device according to the invention and the hose fittings, customary materials are used, which are determined by mechanical strength properties, workability and, in part, friction properties. The primary materials used are metals, in particular steel, aluminum or brass, or suitable hard plastics, for example polyethylene.

The reinforced hose needs - especially when used as a low pressure hose - at most 1 - 3 Hose bands can be integrated. Of course, the integration can also take place in any other, arbitrary way.

The hose produced with a device according to the invention for pressing in a hose fitting on one or both sides can be used for all types of transport hoses. Important areas of application are flexible lines for the transportation of oil, natural gas, liquid and gaseous chemicals, food and beverages, e.g. Beer, wine, milk, fruit juices or spirits.

The device can be used particularly well in the food and beverage industry. Here, a smooth transition between the hose core and the fitting is particularly important with regard to hygiene. The hose expansion that is therefore necessary increases the risk of injury to the hose core, but this is prevented by the use of the device according to the invention.

• - Fig. 1 einen Längsschnitt einer erfindungsgemässen Vorrichtung, kurz vor dem Einpressen der Schlaucharmatur,
• - Fig. 2 eine Stirnansicht eines aus drei Segmenten bestehenden Spreizdorns.
• - Fig. 3 eine aufgeschnittene Seitenansicht von Fig. 2,
• - Fig. 4 drei Erweiterungssegmente für Fig. 2,
• - Fig. 5 eine aufgeschnittene Seitenansicht von Fig. 4,
• - Fig. 6 einen Längsschnitt durch eine Konusmutter,
• - Fig. 7 einen Längsschnitt durch eine als Stufenscheibe ausgebildete Druckplatte,
• - Fig. 8 eine aufgeschnittene Seitenansicht eines aus Einführungssegmenten bestehenden Einführungsringes,
• - Fig. 9 die Ansicht von Fig. 8 von links,
• - Fig.10 eine Seitenansicht einer Hilfsstange, und
• - Fig.11 eine Variante des Klemmorgans von Fig. 1 im Längsschnitt.

The invention is explained in more detail with reference to the drawing, for example. The schematic sections or views show in

• 1 shows a longitudinal section of a device according to the invention, shortly before the hose fitting is pressed in,
• - Fig. 2 is an end view of an expanding mandrel consisting of three segments.
• 3 is a cut-away side view of FIG. 2,
• 4 shows three extension segments for FIG. 2,
• 5 is a cut-away side view of FIG. 4,
• 6 shows a longitudinal section through a conical nut,
• 7 shows a longitudinal section through a pressure plate designed as a stepped disk,
• 8 is a cut-away side view of an insertion ring consisting of insertion segments,
• 9 shows the view of FIG. 8 from the left,
• 10 shows a side view of an auxiliary rod, and
• 11 shows a variant of the clamping member of FIG. 1 in longitudinal section.

Fig. 1 shows a thick-walled hose 10 made of conventional materials, into which a clamping member designed as an expanding mandrel 12 with a corresponding outer diameter is inserted. The end wall 14 of the expansion body, which is outer with respect to the hose 10, has a distance L from the hose end which is greater than the length of the hose fitting 16, which has approximately the same inner diameter as the hose 10.

The expanding mandrel 12 is penetrated by a threaded rod 18 which extends over the entire device and into which a right-hand thread is screwed.

The first conical nut 22, which is freely rotatable on the threaded rod 18, engages with the end wall 20, which is inner with respect to the hose 10, of the expanding mandrel 12, which consists of four uniform segments. The second cone nut 26, which is clamped on the threaded rod 18 with a lock nut 24, on the other hand stands with the outer forehead wall 14 of the expanding mandrel 12 in engagement. If the threaded rod 18 has a left-hand thread, the first cone nut 22 is in engagement with the outer end wall 14, and the countered second cone nut 26 is in engagement with the inner end wall 20 of the expanding mandrel 12. The expanding mandrel 12 - which cannot be seen in FIG. 1 - has already expanded in the radial direction, as a result of which the hose 10 and the 0-rings 28 have expanded somewhat.

In the area of the expanding mandrel 12, two plastic shells 30 are arranged, each with a recess adapted to the outer diameter of the expanded hose 10. The plastic shells 30 in their longitudinal direction through bores 31 are suitable, after inserting screws, to fasten the hose 10 with the device for pressing in at a suitable point.

On the opening of the hose fitting 16 facing the hose, a ring composed of four insertion segments 32 is placed, which is likewise penetrated by the threaded rod 18. The cone 34 of the insertion segments 32 which tapers slightly in the direction of insertion of the hose fitting 16 has the effect that the hose opening is widened and can slide over the hose fitting 16 without damaging the hose core.

The hose fitting 16 lies with the other end face on the pressure plate 36. This is designed as a stepped washer such that all nominal widths of the hose fitting 16, in particular the DIN standards, can be attached. The end face of the hose fitting facing away from the hose end can be designed as a flange which can be fastened to a corresponding base.

A crank 38 - the handle is not shown in FIG. 1 - is with its nut 40 on the threaded rod 38 screwed and forms a thrust bearing 42 when pulling with the thrust washer 36. The nut 40 of the crank 38 can be clamped with a lock nut 44. Depending on the direction of rotation of the threaded rod 18, the lock nut 44 is arranged on one or the other side of the nut 40.

If a thin-walled, flexible hose 10 has to be pulled onto the hose fitting 16, the device according to FIG. 1 is supplemented by four hose supports 70. These each have a bolt 72 which engages with a hole in the hose 10. The hose supports 70 are inserted into the form-fitting bores of the plastic shells 30, which are not visible in section.

2 and 3, an expanding mandrel 12 is shown in more detail. It consists of three identical segments 46, which therefore each form an angle of 120 ° with the center point. In the middle of each segment 46, a bore 48 is recessed in the radial direction, which is intended for receiving bolts. In the area of both end faces 14, 20 of the expansion body 12, the bore of the expansion body extending in the axial direction is widened. The opening angle ß is adapted to the conical nuts, it is half of their opening angle. The segments 46 are held together by two 0-rings 28.

4 and 5, extension segments 50 are shown, which are suitable for adapting the diameter of the segments 46 of FIGS. 2 and 3 to a larger nominal diameter of the hose. The bolt (s) 52 of the extension segments 50 can be inserted into a corresponding hole (s) 48 in the segments 46 of the expanding mandrel 12. As with the expanding mandrel 12 itself, the segments holding together elastic means are 0-rings 28, which are inserted into ring grooves.

Fig. 6 shows a cone nut 22, 26. The first and second cone nuts differ in their geometrical Shape not. They have a thread 54 with which they can be screwed onto the threaded rod. The conical jacket 56 of the conical nut has an opening angle 10 <of approximately 42 °, which is in particular in the range of 30-60 °.

The pressure plate 36 shown in axial section in FIG. 7 has four different contact surfaces 58 for hose armature with different, preferably standardized nominal diameters. With 42 the recess for forming the thrust bearing is designated.

8 and 9 show an insertion ring formed from three insertion segments 32, which is placed on the hose fitting in the direction of the hose. The conical surface 34 has an angle γ of 15 ° with respect to the longitudinal axis. This conical surface is very smooth so that the hose to be expanded slides as well as possible. When the hose fitting is pressed in, the insertion segments 32 are pressed onto the end face of the hose fitting and are supported on their annular contact surface 60. The end faces of the insertion segments 32 facing away from the hose have bores 62 in the middle (FIG. 9), into which a thread is screwed in the present case.

An auxiliary rod 64 according to FIG. 10 can be screwed into a bore 62 of each insertion segment 32. A corrugated or rimmed head 66 enables the screwing in to be carried out easily by hand. The length of the screw 68, corresponding to the bore 62 of FIG. 9, is approximately in the range of 12 mm. The threads are not necessary per se.

According to the variant of the clamping member shown in FIG. 11, a holding mandrel 74 is inserted into the hose 10. The holding mandrel 74 screwed onto a threaded rod 18 is fixed with a lock nut 76. Two plastic shells 30 are introduced into the holes 31, not Darge put screws on the hose 10 pressed. One of the total of four hose supports 70 is indicated outside the cutting plane.

example

• I.Die Gewindestange 18 und die beiden Konusmuttern 22 und 26 werden mit medizinischem Weissöl oder einem Paraffinöl eingeölt.
• 2.Die Kontermutter 24, die zweite Konusmutter 26, der Spreizdorn 12 und die erste Konusmutter 22 werden auf die Gewindestange montiert. Die zweite Konusmutter 26 wird gekontert, die erste Konusmutter 22 von Hand so eingedreht, dass sie satt am Spreizdorn anliegt.
• 3.Die Gewindestange 18 mit dem fertig montierten Spreizdorn 12 wird in den Schlauch 10 eingeführt, bis die äussere Stirnwand 14 des Spreizdorns 12 den Abstand L vom Schlauchende hat. Dieser Abstand L richtet sich nach der Länge der Schlaucharmatur 16, der Einführungssegmente 32, der Kontermutter 24 und der zweiten Konusmutter 26.
• 4.Die Kontermutter 44 und der Schaft 40 der Kurbel 38 werden am andern, freien Ende der Gewindestange 18 aufgeschraubt und gekontert.
• 5.Die Kurbel 38 wird im Uhrzeigersinn gedreht, bis sich der Spreizdorn 12 im Schlauch 10 fest verankert hat.
• 6.Im Bereich des Spreizdorns 12 werden zwei passende Kunststoffschalen 30 auf den Schlauch 10 aufgesetzt und gegebenenfalls in einen Schraubstock eingespannt.
• 7.Nach dem Lösen der Konterschraube 44 werden die Kurbel 38 und die Kontermutter demontiert.
• 8.Die Einführungssegmente 32 werden an der Vorderseite der Schlaucharmatur 16 aufgesetzt, dann die Schlaucharmatur 16, der Konus 34 und das Schlauchinnere mit medizinischem Weissöl bzw. Glycerin eingesprüht.
• 9.Die Schlaucharmatur 16 mit den montierten Einführungssegmenten 32 wird über die Gewindestange geschoben und ein wenig auf den Schlauch gedrückt.
• 10.Die als Stufenscheibe ausgebildete Druckplatte 36 wird aufgesetzt und der Mutter 40 mit der Kurbel 38 bis zum Anschlag aufgeschraubt.
• 11.Durch stetiges Drehen der Kurbel wird die Schlaucharmatur 16 in den Schlauch 10 gepresst. Dabei wird darauf geachtet, dass die Schlaucharmatur während der ersten Zentimeter nicht schräg in den Schlauch gepresst wird.
• 12.Die Kurbel 38 wird ganz zurückgedreht und die als Stufenscheibe ausgebildete Druckplatte 36 abgenommen.
• 13.Die in Fig. 10 dargestellte Hilfsstange 64 wird zwischen der Gewindestange 18 und der Schlaucharmatur 16 eingeschoben und in die Bohrung 62 (Fig. 9) eines Einführungssegements 32 gesteckt.
• 14.Mit einem Kunststoffhammer wird dosiert auf den Kopf 66 der Hilfsstange 64 geschlagen bis ein Einführungssegment 32 herausgestossen ist und die andern zusammenfallen. Dann werden die Einführungssegmente 32 herausgenommen. Falls die Kunststoffschalen 30 in einen Schraubstock eingespannt sind, werden diese gelöst und der Spreizdorn 12 analog zum Spannen durch Drehen der gekonterten Kurbel 38 im Gegenuhrzeigersinn wieder entspannt.
• 15.Die Gewindestange 18 mit dem montierten Spreizdorn wird herausgezogen.

With the device shown in FIG. 1, a hose fitting 16 is pressed into a hose 10 as follows, for example for conveying beer, which has the same nominal width as the hose fitting:

• I. The threaded rod 18 and the two cone nuts 22 and 26 are oiled with medical white oil or a paraffin oil.
• 2.The lock nut 24, the second cone nut 26, the expanding mandrel 12 and the first cone nut 22 are mounted on the threaded rod. The second cone nut 26 is countered, the first cone nut 22 is screwed in by hand so that it fits snugly against the expanding mandrel.
• 3. The threaded rod 18 with the fully assembled expanding mandrel 12 is inserted into the hose 10 until the outer end wall 14 of the expanding mandrel 12 is at a distance L from the end of the hose. This distance L depends on the length of the hose fitting 16, the insertion segments 32, the lock nut 24 and the second cone nut 26.
• 4. The lock nut 44 and the shaft 40 of the crank 38 are screwed onto the other, free end of the threaded rod 18 and locked.
• 5. The crank 38 is turned clockwise until the expanding mandrel 12 is firmly anchored in the hose 10.
• 6. In the area of the expanding mandrel 12, two suitable plastic shells 30 are placed on the hose 10 and optionally clamped in a vice.
• 7. After loosening the counter screw 44, the crank 38 and the lock nut are removed.
• 8. The insertion segments 32 are placed on the front of the hose fitting 16, then the hose fitting 16, the cone 34 and the inside of the hose are sprayed with medical white oil or glycerin.
• 9. The hose fitting 16 with the installed insertion segments 32 is pushed over the threaded rod and pressed a little on the hose.
• 10. The pressure plate 36 designed as a stepped washer is placed on and the nut 40 is screwed on with the crank 38 as far as it will go.
• 11. The hose fitting 16 is pressed into the hose 10 by continuously turning the crank. Care is taken to ensure that the hose fitting is not pressed obliquely into the hose for the first few centimeters.
• 12. The crank 38 is turned back completely and the pressure plate 36, which is designed as a stepped disk, is removed.
• The auxiliary rod 64 shown in FIG. 10 is inserted between the threaded rod 18 and the hose fitting 16 and inserted into the bore 62 (FIG. 9) of an insertion segment 32.
• 14. With a plastic hammer, the head 66 of the auxiliary rod 64 is metered until an insertion segment 32 is pushed out and the others collapse. Then the insertion segments 32 are removed. If the plastic shells 30 are clamped in a vice, they are loosened and the expanding mandrel 12 is relaxed again analogously to the clamping by turning the locked crank 38 counterclockwise.
• 15. The threaded rod 18 with the installed expanding mandrel is pulled out.

If points 1 to 5 are omitted when using a device with a clamping member according to FIG. 11, the holding mandrel 74 only has to be screwed and countered onto the threaded rod 18 before being inserted into the hose 10. The relaxation according to point 14 is not applicable. Otherwise there are no significant differences.

Claims (10)

l. Device for pressing a hose fitting (16) into a hose (10),
marked by - One at a distance (L) from its end with the hose (10) in frictional engagement drawing set - An insertable into the bore of the hose fitting (16), the end face pressed into the hose (10) covering the insertion ring, which consists of at least three insertion segments (32), which has a slightly tapering in the pressing direction, smooth cone (34) and a ring trained stop surface (60) for the hose fitting (16), and - A pressure plate (36) as an abutment for the hose fitting (16) when it is pressed into the hose (10). 2. Device according to claim 1, characterized in that the outer diameter of the end face of the insertion segments (32) pointing in the direction of the hose (10) is smaller than the inner diameter of the hose (10). 3. Device according to claim 1 or 2, characterized in that the end faces of the insertion segments (32) pointing in the direction of the pressure plate (36) have a bore (62) arranged in the middle, into which an auxiliary rod (64) inserts or can be screwed in. 4. Device according to one of claims 1-3, characterized in that the drawing set is a threaded rod (18) with a clockwise and counterclockwise direction Has actuatable drive means, preferably a crank (38) with a nut (40) which can be clamped by a lock screw (44). 5. The device according to claim 4, characterized in that the clamping member of the drawing set from one of the inner surface of the hose (10) bearing mandrel (74) with a cylindrical outer surface, which is screwed onto the threaded rod (18) and clamped with a lock nut (76) , and in the region of the holding mandrel (74) is placed over the hose and clamped onto this plastic shells (30). 6. The device according to claim 5, characterized in that the cylindrical outer surface of the holding mandrel (74) has knobs, a screw thread, a transverse grooving or an edge, and via the hose (10) two plastic shells (30), preferably with two bores ( 31) for inserting screws. 7. The device according to claim 4, characterized in that the clamping member of the drawing set from a on the threaded rod (18) guided, but freely movable hollow cylinder, which has at least two segments and is held together by elastic means (28), which on the threaded rod (18) the overlying bore of this expanding mandrel (12) at the end faces (14, 20) is rounded or opens in a conical shape, and a first conical nut (22) with the tip in the direction of the expanding mandrel (13) is freely rotatable on the threaded rod (18). 12), one on the other side of the threaded rod (18) by means of a lock nut (24) fixed the same opening angle ( ₀₄ ) having a second cone nut (26) with the tip in the direction of the expanding mandrel (12), the first cone nut (22 ) in the case of a frictional engagement with the bore of the spreader dorns (12) has the greater frictional resistance than the second cone nut (26). 8. The device according to claim 7, characterized in that the segments (46) of the expanding mandrel (12) are held together by 0-rings (28), which are preferably arranged in the end faces (14, 20) adjacent ring grooves. 9. Device according to one of claims 7 or 8, characterized in that on each segment (46) of the expanding mandrel (12) an extension segment (50) adapted to the inside width of the hose (10) is placed, at least one bolt (52) of an expansion segment is inserted into the corresponding hole (s) of the expansion mandrel segment in question and the expansion segments (50), like the segments (46) of the expansion mandrel (12), are held together by 0-rings (28). 10. Device according to one of claims 5-7, characterized in that thin and / or flexible hoses (10) have at least three holes adjacent to the hose end, which are suitable for receiving hose supports (70) anchored in the plastic shells (30).

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