DE3032936A1 - ELASTIC ROPE AND METHOD AND DEVICE FOR ITS PRODUCTION - Google Patents

Description

3032930

Elastic rope and method and device for its manufacture

The invention relates to an elastic rope consisting of at least one elongated elastic Organ in which at least one end area is provided with a hook, for example a snap hook, as well as to a method and an apparatus for producing such an elastic rope.

In this context, elastic rope should mean all organs made of rubber or rubber-elastic material, such as Ribbons, cords, leashes, cables, belts, braids and the like. Be understood.

Several embodiments of such elastic ropes are known. According to a first known embodiment The elastic ropes consist of an elastic organ, which is made up of a bundle of elastic threads, fibers or the like. Individual elements is formed, which is surrounded by a jacket. At both ends of such a thing The rope has hooks formed by a rigid metal wire that is wrapped around the end and forms a hook part. These ropes have a number of disadvantages, such as weight, the risk of Toasting with untreated metal wires etc. In addition, these hooks, provided they are not used as snap hooks

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Are designed with a resilient closure part, dangerous because they unhook and, for example, in the Wheel spokes can get into use on a bicycle. After all, it is the manufacture of one Hook relatively complex and therefore expensive.

There are also known elastic ropes in which the hook is separate from the elastic organ made of plastic are made. These hooks consist of a tubular or slightly frustoconical part that is inserted into a hook runs out. During rope manufacture, the end of the elastic organ in question goes into the interior of the one-piece pipe part with the hook inserted, whereupon a clasp or a ring on the end of the elastic organ is put on, whereby this Ring is supported on a shoulder or a region of reduced cross-section of the tubular or conical part and holds the hook. Although this type of manufacture has some disadvantages of the former end eliminating hooked ropes, it by no means gives satisfactory results. This depends on it together that the plastic hook is relatively fragile. Isn't the elastic organ stretched, the hook slides on the elastic organ and does not always remain firmly on the end of the rope. In the end This type of manufacture involves a series of assembly operations which must necessarily be carried out by hand

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are what makes the known production method expensive.

The invention is based on the object of providing an elastic rope while avoiding the disadvantages of the known embodiments to create that can be produced easily and at low cost and its hook is secure and is durable, as well as a method and a device for producing such an elastic rope.

This is achieved according to the invention, starting from an elastic rope of the type specified at the beginning achieves that the hook is formed by an injection molded body and a hook part and a base body comprises, the base body to the end region of the elastic organ in a locally deformed state of the same is formed and an insert is provided inside the hook part.

The end region of the insert arranged in the base body of the hook is advantageously bent in such a way that it deviates from a course parallel to the axis of the elastic organ or the hook.

The end region of the insert can also be bent in such a way that it intersects the axis of the hook.

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Advantageously, the elastic organ can cause a local deformation in its end region with a Be provided with a ring.

Due to the configuration according to the invention, the Hooks can be made in a single operation. Due to the local deformations of the elastic organ this is set in the base body of the hook, with which a particularly strong connection is made, their Strength is greater than the opening resistance of the hook.

The manufacturing method according to the invention provides that a local deformation of the end region of the elastic organ brought about, a hook-shaped insert inserted into an injection mold and plastic in the mold to set the insert and the deformed End of the elastic organ is injected.

The local deformation of the end region of the elastic member in the interior of the injection mold can be advantageous be brought about with the help of mutually opposing lamellae, which form the end region of the elastic Press organs together locally, whereupon the plastic between the lamellae to determine the local deformation is injected after the lamellas have been withdrawn.

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The method according to the invention offers the advantage of an extremely simple production-Since also the Use of the hook and the locally deformed end portion of the elastic organ that gets inside the mold, are independent, the introduction of this element is simplified and prevents them from closing before closing move the shape. If namely, as in known designs, the insert with the end of the elastic Organ is firmly connected, for example by forming a ring, so practice has shown that this The insert often stands out, is unstable in its position and hinders or even hinders the closing of the mold destroyed.

In the method according to the invention, on the other hand, the insert is inserted entirely into the interior of the mold and cannot assume an unstable position because it is not yet connected to the elastic organ. Also will the end region of the elastic member is clamped at least in some areas in the stationary molded part at the level of the through opening of the elastic member.

The device finally provided according to the invention for the production of the elastic ropes and for the implementation of the method explained above is marked thereby that the cross section of the passage opening of the elastic ι organ is smaller than the cross section of the disjointed

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squeezed elastic organ is.

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The passage opening of the elastic organ can advantageously have a truncated cone-like shape, whose small cross-section faces the mold cavity.

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Further features and advantages of the invention emerge from the claims and the description below in conjunction with the drawing in which the subject matter of the invention is illustrated by means of several exemplary embodiments is. In the drawing show:

Fig. 1 is a partially sectioned view

an end region of an elastic rope according to the invention,

2 shows a detailed section through the arrangement

corresponding to FIG. 1 to illustrate a type of deformation of the end region of a elastic organ,

Fig. 3 is a section through a modified En area of the elastic organ,

4 shows a schematic representation of a first device for carrying out the manufacturing method according to the invention,

Fig. 5 is a schematic representation of a

second device for carrying out the manufacturing process according to the invention,

6 shows a further embodiment of a hook according to the invention,

7 shows a section along the line VII-VII in FIG. 6,

FIG. 8 shows a section along the line VIII-VIII of FIG. 6,

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Pig. 9 shows a section along the line IX-IX of

Fig. 6,
Fig. 10 is a section along the line XX of the

Fig. 6 and
11 shows a section along the line XI-XI

the upper hook area.

According to the illustration in FIGS. 1 and 2, the elastic part according to the invention is in the form of a rope, band Cable, belt or the like. an elastic member 1 attached to a hook 2. The hook 2 exists from a loop or hook part 3, which is connected to a base body 4, which in turn with the end of the elastic organ 1 is connected.

The elastic member 1 can be formed from a bundle of elastic cords, bands or threads that are given if they are surrounded by a sleeve or braided jacket, it can also be a single elastic strand trade with oderbhne coat. The hook part 3 of the hook 2 is formed by a resilient] that is integral with the base body 4. Closure part 5 closed.

In the interior of the hook part 3, an insert 6 is provided, the upper end 61 of which corresponds to the shape of the hook part is bent, while its lower end portion 62 is bent only very slightly so that the axis'X-X

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of the hook is cut. Fig. 1 shows the tracks 7 that the clamping member has left, which in the Form of manufacture of the local deformation of the end region of the elastic member 1 is used.

The sectional view in Fig. 2 shows schematically the deformation of the end region of the elastic organ 1 in the Inside the main body 4.

The small organ is formed by lamellae which are approached to one another and which press the end area of the elastic organ 1 together and deform locally. When they are withdrawn, these lamellae leave the visible traces 7, which increase the roughness of the hook body; this improves the grip of the hook. By a Such local deformation of the end region of the elastic member 1 forms anchoring zones for the shaped body.

The lamellas (L) are brought closer to one another in such a way that the elastic organ between two tracks 7 does not move can deform and the deformation as a whole to the end region 9 of the elastic member 1 in the interior of the base body is displaced.

3 illustrates a modification of the deformation of the end region of the elastic organ 1. According to this embodiment

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Transformation is a ring or a clasp 8 around the end area of the elastic member 1 is used, the other elements of the hook being identical.

Depending on the purpose of the hook, the locking part 5 can be omitted, directly during the shaping or, during the injection process or later by a cutting process.

It is also possible to cover only a region of the insert 6 and, for example, the hook arch 31 forming the main area 61 of the insert 6 to leave free. The lower end region 62 of the insert 6 is so um- or bent so that it no longer runs parallel to the hook axis X-X. This is important to prevent that the insert 6 and consequently the upper region 31 of the hook part 3 rotate about the cross section 33 and the Can bring the end region of the hook part 31 out of engagement with the closure part 5.

The size of the local deformations depends on the elasticity of the elastic organ and / or the plastic which is used to make the hook ■. the Local deformation or deformations that affect the end region of the elastic member 1 in the base body 4 of the hook 2 set, must withstand a tensile force that is greater than that, the opening of the hook bow 31 her-

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calls.

To produce an elastic rope or the like. with one Hook, the end region of the elastic member 1 is placed in a form which, after the insert has been inserted 6 is closed. Through organs in the form of protruding lamellae inside the mold (not shown the end region of the elastic organ is compressed and locally deformed. It is of particular importance that the lamellae that cause this local deformation and those from two sides of the mold protrude, are close to each other, so that the elastic organ is deformed in such a way that it is locally compressed, as illustrated in FIG. Since the slats are closely approximated and the lamellae of the two groups act against each other, the (practically incompressible) elastic material becomes towards the free end of the elastic organ, i.e. in the corresponding area of the base body 4 of the hook (Fig. pushed into it.

The lamellas allow the plastic to be injected and, after the cooling process, form borders that maintain the local deformation (compression) of the elastic organ. In case of local deformation, which is formed in combination of a ring and lamellas, the ring becomes closer to the end area

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arranged elastic organ as the area corresponding to the lamellae.

The injected plastic forms the base body 4 and the hook part 3, depending on the needs the area 61 of the insert 6 is completely or partially enveloped. The bet 6 can be any suitable reinforcing material, in particular made of metal.

In the second manufacturing method, which leads to a hook as shown in FIG previously a ring or a clasp on the free end region of the elastic organ 1 to bring about a local deformation of the same attached. The end region of the organ 1 is inserted into the production mold, before or after the insert 6 has been inserted into it. Then the injection molding process is as above carried out. Although the ring 8 can be made of any suitable material, preferably a Metal ring used.

Generally speaking, the local deformation of the end region of the elastic organ can be by other means be made in the end region of the elastic organ. It can be provided, for example (not shown), to open the end area around which the elastic organ

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forming fibers or cords, at least in some areas to expose and to inject the plastic onto these fibers, or there could be an organ in the form of this end area a wedge are introduced, which causes a local deformation, and the like more, where appropriate finally a deformation by pressing together with the aid of a ring and / or by means of the lamellae of the Manufacturing form can be made.

It is special to strengthen the connection between the base body of the hook and the elastic organ It is advantageous that, in the case of a covered elastic organ, the cover can be melted or melted in the heat. is welded to the plastic forming the base body 4.

To carry out the method, a form of the type shown in FIGS. 4 and 5 is preferably used, used. This shape consists of two molded parts 10 and

11 with means that prevent the injected under pressure Plastic material from the through hole

12 of the elastic organ 1 can escape. To this For this purpose, the cross-section of the opening 12 is selected to be smaller than the cross-section of the elastic member 1. This cross section can be reduced so far that the elastic organ 1 to the limit of its elastic deformability is deformed. Also, the shape comes with a seal

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Mistake.

The opening 12 of frustoconical shape for the The passage of the elastic organ 1 is such that its small base area (FIG. 4) towards the Pormhöhlung 13 is located.

The opening 12 is of a groove in the one with the molded part 11 firmly connected part 13 bounded by a pin receives in complementary form, which is provided on the part 15 which is fixed to the movable molded part 10 connected is.

As shown in Fig. 5, the frustoconical opening 12 is defined by two parts 16 and 17, which move in opposite directions in the transverse direction (arrows B) for the insertion of the elastic member 1. The mold space is limited by the mold parts 18 and 19, which on their part can be moved in opposite directions (arrows C). The two Molded parts 18 and 19 carry heads 20 and 21 which mate with parts 16, 17.

As shown in Figs. 6 to 11 comprising the elastic cable, rope od. Like. A resilient member 1 ^1, which is fixedly connected with a hook 2 '. The hook 2 ¹ comprises a hook part 3 'which is connected to the base body 4'. The end region of the elastic organ 1 '

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is set in the base body 4 ¹ . This definition takes place through a local deformation of the end region of the elastic organ 1 '. Such a permanent deformation is brought about with the aid of clamping elements, not shown, which leave ^{the traces 7 'on the base body 4 1.} In the example shown, there are one track 7 ′ on the front surface and two tracks on the rear surface of the base body 4 ¹ . The two rear tracks are shown in dashed lines. The tracks are arranged in such a way that, when shown, they are aligned in the plane of symmetry of the hook as shown in FIG.

The ^{hook part 3 1 of} the hook is reinforced by an insert 6 'in the form of a circular arc. The length of the insert 6 'is such that its lower end region 62' is in the axis of the elastic member 1 'and its other end 61' extends to the end 31 'of the hook part 3 ¹ .

Fig. 6 leaves holes 11 'of a substantially conical shape Recognize the shape of the trace from inside the mold for positioning the insert 6 'during the molding process correspond to the wedges provided. The wedges are distributed so that the insert has at least three support points is obtained, as shown schematically in FIG.

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The hook is closed by a locking part 5 ", whose cross section is much smaller than that of the hook part and the base body, since this closure part only has the task of closing the hook. As Fig. 8 shows, the closure part has a rectangular cross-section, the large sides of which run parallel to the plane of symmetry (drawing plane of FIG. 6). Through this it is possible to elastically deform the closure part and to one side or the other of the plane of symmetry To open the hook. The end 31 'of the hook part is rounded, while the end of the closure part with respect to the end of the hook part is essentially ι is even.

The connection between the base body 4 ¹ and the closure part 5 ″ is made via a connection surface 41 *.

7 shows, in a regional section, the arrangement of the various elements and in particular of the insert 6 'in the hook part 3' and the base body 4 '. The sectional representations of FIGS. 8, 9 and 10 show the shape of the base body 4 ″ in different sectional planes and the connection between the base body 4 ″ and the closure part 5 ¹ .

The sectional view in Fig. 11 illustrates how

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stated above, the arrangement of the insert in the hook and shows in particular the tracks 11 'of the positioning wedges of the hook part in the shape.

According to an advantageous embodiment, the insert 6 ^{1 has} a circular cross section.

The production and molding of such a hook on the end region of an elastic organ are simple Low cost operations.

First of all, the insert 6 'has a simple geometrical Shape / because it is a section of a ring or circular arc made of a suitable steel with a circular Cross-section acts. The shape of the hook is, in turn, relatively simple, which reduces manufacturing costs the mold can be kept low. Since the locking part has a simple shape and no locking or latching is provided with the corresponding end of the hook, the molding process goes easily without that it would be necessary to move the closure part into the corresponding end region of the hook when it emerges from the mold to snap into place, as is required in a number of embodiments of snap hooks.

In addition, the opening of the hook part is proportionate large, since the closure part laterally (i.e. vertically

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to the plane of the drawing in FIG. 6), in contrast to those snap hooks in which the locking parts get with the hook parts in locking engagement, the locking part to the rear in the Level of the hook is folded back. In this case the opening is relatively restricted, in particular when the hook is not in the shape of a circular arc but has an elongated shape.

Furthermore, the insert can be produced at very low cost, since it is a part that is included in Large series can be produced and not a series of successive operations such as cutting and bending operations etc. requires.

Finally, the positioning of the insert is very easy because it or the like of wedges. Support members in the Form is supported. Since the insert has a circular cross-section, it brings itself to the Wedges in position that preferably provide three-point support.

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Claims (1)

Patent claims: 1. Elastic rope, consisting of at least one elongated elastic member, in which at least one end region is provided with a hook, for example a snap hook, characterized in that the hook (2; 2 ') is formed by an injection molded body and a hook part (3; 3 ") and a base body (4; 4"), the base body is molded onto the end region of the elastic member (IyI ¹ ) in a locally deformed state thereof and an insert (6; 6 ') inside the hook part is provided. 2. Rope according to claim 1, characterized in that the end region arranged in the base body (4; 4 ') of the hook (2; 2') (62; 62 ') of the insert (6; 6 ") is bent in such a way that it deviates from a course parallel to the axis of the elastic member (1; 1 ') or of the hook (2; 2'). Rope according to claim 2, characterized in that the 130015/1308 303293Θ End region (62; 62 ') of the insert (6; 6 ^! ) Is bent in such a way that it intersects the axis (XX) of the hook (2; 2 ^f ). 4. Rope according to one of claims 1 to 3, characterized in that the elastic member (1) in his End area is provided with a local deformation causing ring (8). 5. Rope according to one of claims 1 to 4, characterized in that the hook part (3 ¹ ) and the insert (6 ¹ ) have the shape of an arc. 6. Rope according to one of claims 1 to 5, characterized in that the closure part (5 ¹ ) of the hook designed as a snap hook (2 ¹ ) is formed by a relatively thin lamella with respect to the end region of the hook with such elasticity that it is in can be bent laterally with respect to the plane of symmetry of the hook. 7. Rope according to claim 6, characterized in that the closure part (5 ¹ ) has a rectangular cross section, the long side of which runs parallel to the plane of symmetry. 130013/1308 8. Rope according to one of claims 5 to 7, characterized in that the hook (2 ¹ ) has a hexagonal cross section. 9. Rope according to one of claims 5 to 8, characterized in that the insert (6 ¹ ) has an at least substantially circular cross section 10. A method for producing an elastic rope according to any one of claims 1 to 9, characterized in that that a local deformation of the end region of the elastic organ is brought about, a hook-shaped one Insert inserted into an injection mold and plastic into the mold to set the insert and the deformed End of the elastic organ is injected. 11. The method according to claim 10, characterized in that that the local deformation of the end region of the elastic member inside the injection mold with The help of mutually opposing lamellae is brought about which locally compress the end area of the elastic organ, and that the plastic between the lamellae to determine the local deformation when cooling of the plastic is injected. 12. The method according to claim 10, characterized in 13 0 013/1308 net that the local deformation of the end region of the elastic organ before it is introduced into the shape mj « Wiro brought about the help of a ring or a clasp 13. The method according to any one of claims 10 to 1 / characterized in that the end region of the elastin > organ is provided with a ring and the end region is additionally deformed by pressing together with the aid of the mold. 14. The method according to one of claims 10 to 13, characterized in that the injected plastic with the sheathing surrounding the elastic organ, is brought to weld. 15. The method according to any one of claims 10 to 14, for producing an elastic rope according to one of the Claims 5 to 9, characterized in that an insert with a substantially circular cross-section and using an injection mold with pointed wedges that are above the level of the hook's formation Serving mold area protrude and serve to accommodate the insert before the plastic is injected will. 16. Device for carrying out the process. 13 0 0 13/1308 3032931 according to one of claims 10 to 15, consisting of an injection mold with two delimiting a mold cavity Molded parts, characterized in that in the mold cavity at the level of the outlet opening (12) of the elastic Organ, the passage cross section of the opening of the elastic organ is smaller than the cross section of the uncompressed organ elastic organ is. 17. The device according to claim 16, characterized in that that the passage opening (12) of the elastic table Organ has a frustoconical shape, the smaller of which Cross-section facing the cavity. 18 · Device according to claim 16 or 17, characterized characterized in that in the region of the mold cavity receiving the end region of the elastic member, each of the two molded parts (10, 11; 18, 19) with lamellae for pressing together of the elastic organ is provided. 13 0013/1308