DE20113541U1 - Breakaway coupling - Google Patents

Description

Roman Seliger GmbH & Co. KG, An'n Slagboom 20, 22848 Norderstedt Breakaway coupling

The invention relates to a breakaway coupling for sealingly connecting conveyor lines transporting liquid or gaseous media, comprising two coupling halves, at least one of which is equipped with valve means that block the flow of media in the uncoupled state, and a connecting device having at least one securing element, with which the two coupling halves are detachably coupled to one another to establish a flow connection, wherein the connecting device comprises flanges of the coupling halves joined together, at least one clamp-like clamping connecting element that establishes the flange connection by means of a positive clamping fit on the abutting flanges and can be removed transversely to the coupling axis, clamping means that fix the connecting element to the flanges, and a release mechanism that is formed by a securing means that secures the seat of the connecting element and a release means that triggers the detachment of the connecting element.

Breakaway couplings, also known as emergency disconnect couplings, are used as safety couplings in delivery lines, particularly in the area of regular connection coupling points. For example, a delivery line is used to connect a stationary tank to the tank of a tanker. Delivery lines that can be secured with a breakaway coupling are used in particular in the chemical and food processing sectors. The breakaway coupling works in such a way that its coupling halves separate from each other when the connecting device is subjected to tension; the separation of the coupling halves is accompanied by the closing of an associated valve device, particularly with closing valves in both coupling halves. An overload leading to an emergency separation occurs, for example, when the delivery line of a tanker is still connected to the tanker after filling a stationary tank has been completed and the tanker starts moving. The breakaway coupling then ensures that the delivery line can be separated and closed at the separation point.

Breakaway couplings of this type with clamp-like tension connecting elements are known (EP-Al O 517 127; DE-Ul 200 07 117), which are positively seated on flange attachments of the coupling halves by means of bevelled flanks. Tension rings or spring-loaded levers assigned to each clamp connecting element are provided to secure the clamp connecting elements in their position. The tension rings or the levers are connected to breakaway cables in order to release one tension ring or several levers under cable tensile load. In order to particularly secure a tension ring that can be pulled off with a pull cable, an additional spring locking mechanism must be formed between the tension ring and the clamp connecting elements. The levers must be clamped against the coupling housing with additional means that can be connected to a breakaway device. The known breakaway couplings therefore have relatively complex structures that must be arranged on their outer circumference to secure the connection. Such constructions are relatively complex to manufacture and special precision requirements must be met, so that the known devices are on the whole correspondingly expensive to manufacture.

The invention is based on the aim of creating an improved breakaway coupling which is particularly simple in design, meets the highest safety requirements and can be produced cost-effectively.

These objectives are achieved in conjunction with the features of the breakaway coupling mentioned at the outset in that the positive clamping seat of each connecting element on the flanges is produced by at least one holding element which passes through the wall of the connecting element and positively engages at least one associated flange opening, thereby being in the locking seat, the holding element forming a clamping and securing element which is connected to the release means and can be removed from its locking seat between the connecting element and the flange in order to release the associated connecting element. According to the invention, a positive connection is formed directly between at least one clamping connecting element and a connecting flange, which releasably secures the seat of the connecting element on the connecting flanges. This construction is structurally simple and inexpensive to manufacture, since additional components or clamping devices which only indirectly secure the clamping connecting elements are conventionally required.

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bar to the flanges are eliminated. The positive connection according to the invention also means that the precision requirements between the connecting flanges and the clamping connection elements are not as high as in the known devices. The holding elements are simple components in a clamping-sliding position that act as locking bolts and can also be easily connected to the release means in order to remove them from the locking area between the flange and the clamping connection element by exerting a pulling force. This also contributes to the fact that the breakaway coupling according to the invention is on the whole particularly simple and cost-effective while still offering the highest functional reliability.

The abutting flanges advantageously have a connecting cross-section that narrows outwards in the radial direction, with the connecting element being designed with corresponding seating surfaces. The connecting cross-section is preferably trapezoidal. Such a tapered connecting structure contributes in particular to sealing at the connection point between the coupling halves. The structure also facilitates the detachment of the clamping connecting elements.

In a preferred embodiment, the coupling halves are joined together against spring force. Such an axial spring force is expediently applied by closing check valves. In particular, the valve spring force in combination with the tapered connection structure means that each clamping connection element is kept tensioned against radial components of the spring force on the flanges, which significantly supports the ejection of the clamping connection element when the separating connection is released.

A particularly simple design of the form-locking connection according to the invention consists in that the flange opening is formed by at least one hole that is aligned with an associated hole in a leg wall of a cap-shaped connecting element. Depending on the requirements or dimensions of the form-locking connection, a hole can be formed in only one flange, or aligned holes can be formed in both flanges, so that the holding element passes through at least one separation point. If necessary, it engages in both legs.

a U-shaped clamping connection element so that it passes through two separation points.

A special design of the positive connection consists in that the holes receiving the holding element extend at least almost parallel to the coupling axis. Alternatively, it may be expedient for the holes receiving the holding element to extend obliquely in the direction of the coupling housing, starting from a hole opening at the end of the holding element connected to the release means.

In a preferred design, each holding element is held captive on the connecting element, preferably in a hole that catches the holding element. This integration of the holding element into the connecting element results in a simple construction in which each clamping connecting element can be caught on the coupling after it has been separated via the holding element and a release device connected to the coupling, or in order to prevent it from falling down.

A special design also consists in the fact that the holding element is a sliding element that can be released from its locking seat against spring force. In particular, the holding part integrated into the clamping connection element is equipped with a spring-loaded seat. This further simplifies the assembly of the breakaway coupling.

A wide variety of shapes can be provided for the geometry of each clamping and holding element. In particular, cylindrical pin sliding elements are available as holding elements in the form of standard or normed parts at low cost. Another design is that the holding element is a plate-shaped sliding element, in particular curved according to the circumferential extent of the clamping connection element. With a holding element designed in this way, a higher load on the connection is possible in relation to the geometry of the holding element.

In a particularly advantageous embodiment of the invention, at least one clamping connection element is designed as a circular arc-shaped segment with a circumferential extension of maximum

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180°. Preferably, at least two such elements are arranged as circular arc caps or sleeves distributed around the circumference of the flange connection.

According to a further embodiment of the invention, at least one adjusting screw element is arranged on at least one wall of the connecting element for adjusting the clamping and form-locking connection between the connecting element and the flanges or between these parts and each holding element. Adjusting screws for compensating for manufacturing tolerances and for additional fastening of a clamping connecting element are known from DE-Ul 200 07 117. According to the invention, however, the adjusting elements are particularly effective in combination with the form-locking connection provided directly between the flange and the clamping connecting element, whereby they interact with one or more associated holding elements. This interaction can be created in a particularly pronounced manner by arranging at least one adjusting element only on the leg wall of a U-shaped connecting element in which at least one holding element is located in the through-fit seat between the connecting element and the associated flange.

Although it is conceivable that each holding element is connected directly to a line part and/or coupling part in order to apply tensile force to each holding element for pushing it out of the locking position in the event of a load, the breakaway coupling according to the invention is, however, in a preferred design provided with a release device which comprises cable means guided on a coupling half, each holding part being connected to a cable end for moving it out of its locking seat.

Subclaims are directed to the above-mentioned and other expedient and advantageous embodiments of the invention. Particularly expedient and advantageous embodiments or possibilities of the invention are described in more detail in the following description of the embodiments shown in the schematic drawing. They show
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Fig. 1 in axonometric representation a tear-off according to the invention

coupling,

Fig. 2 in longitudinal view in partial section a tear-off according to the invention

coupling,

Fig.3 the detail X in Fig. 2 in sectional view rotated by 30°,

Fig. 4 the detail y in Fig. 2 in sectional view,

Fig. 5 to 8 in profile cross section connecting structures according to the invention

Breakaway couplings and
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Fig. 9 and 10 in profile view connecting retaining elements according to the invention

Breakaway couplings.

Fig. 1 shows a breakaway coupling 1.1 according to the invention, which can be connected to pipes or hoses via fastening flange rings 12. The breakaway coupling 1.1 consists of two coupling halves 2 and 3. Each coupling half 2, 3 has a hollow cylindrical housing 21, 31 with an inner and outer circular cross section. A closing valve 4, 5 is housed in each coupling housing 21, 31. The two coupling halves 2, 3 are connected to one another against the spring forces of the two closing valves 4, 5 via circular ring-shaped attachment flanges 23, 33. By means of a connecting device 6 provided according to the invention, the two attachment flange rings 23, 33 are fixed to one another with flat front ring surfaces in the joint.

The basic clutch structure, which applies accordingly to the clutch 1.1 in Fig. 1, is described using the breakaway clutch 1.2 in Fig. 2. In Fig. 1 and Fig. 2, identical or corresponding components have been given the same reference numerals.

When the coupling 1.2, which produces the flow of media, is closed, the coupling halves 2, 3 are seated against each other in a butt-fit manner. The coupling half 2 has a projection 24, while the coupling half 3 is provided with a corresponding recess 34. Each coupling half 2, 3 has a spoke element 22, 32. The spokes 22, 32 form passage openings for the inlet and outlet of the fluid to be

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transported medium. A closing check valve 4 is mounted on the spoke element 22, while the correspondingly designed closing check valve 5 is held on the spoke element 32. Valve bodies 41, 51 forming closing cones are supported on the holding spoke elements 22, 32 via associated valve springs 42, 52.

When the coupling halves 2, 3 are joined together, the valve bodies 41, 51 abut against each other against the axial forces of the valve springs 42, 52, so that medium-permeable flow channels 11 are created between the valve bodies 41, 51 and the housing walls. On the other hand, when the coupling halves 2, 3 are separated, the valve bodies 41, 51 are pushed outwards in the axial direction by the associated valve spring 42, 52, whereby each coupling opening is sealed off from the medium. For this purpose, the closing cones of the valve bodies 41, 51 each have grooves 43, 53 on the sides facing each other, into which sealing elements, for example O-rings 44, 55, are inserted. As can be seen from the partial view in Fig. 3, the housing halves 21, 31 are connected in the area of the projection 24 or recess 34 via holes 27, 37 into which pins 14 are inserted. These ensure that the coupling halves 2, 3 are joined together in a rotationally secure manner and that a rotational movement is transferred to the other coupling half when one coupling half is rotated. The coupling half 3 with the recess 34 is provided with a circular, circumferential groove 35 into which an O-ring 36 is inserted as a sealing means. When assembled, the O-ring 36 presses against the projection 24 and thus seals the breakaway coupling in the area of the abutting surface between the projection 24 and the recess 34.

The connecting device 6 according to the invention is described below with reference to Fig. 2. The device 6 of the coupling 1.1 in Fig. 1 is designed accordingly. The connecting device 6 comprises two shell-shaped connecting elements 61, 62, with which the two flanges 23, 33 are clamped flat against one another against the valve spring forces generated in the coupling center axis 10.

The flanges 23, 33, which are joined together and run completely around the circumference of the housing, have an isosceles trapezoidal connecting cross-section that narrows outwards in the radial direction. Each connecting element 61, 62 is designed as a clamp-like sleeve or cap element with a trapezoidal outer and inner profile cross-section. A U-shaped profile with web wall 63

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φφ φφ φ φ

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and leg walls 64, 65. The inner surfaces of the connecting elements 61, 62 are shaped so that the elements 61, 62 rest on the flange assembly at least essentially in a form-fitting manner. The connecting elements 61, 62 are designed in the same way. In each case, a circular arc-shaped segment with a circumferential arc angle of approximately 120° is provided. These segments are placed on the two flanges 23, 33 at equal circumferential angle intervals of approximately 60° in a diametrically opposed arrangement.

It can be seen that the connecting elements 61, 62 are driven outwards in a radial direction by radial components generated by the axial valve forces due to the form-fitting and seating surfaces which are inclined due to the trapezoidal shape. The clamping connecting elements 61, 62 must be fixed and secured in their position against these radial forces. This is achieved in a very simple manner according to the invention in that each connecting element 61, 62 is held and secured by bolt-like holding elements 7. Each holding element 7 passes through the wall of each connecting element 61, 62 and engages in a form-fitting manner in an associated flange opening 330. The holding elements 7 are each inserted into the connection in a clamping-sliding position on one and the same leg wall 65 of the connecting element 61 or 62.
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In the embodiments of Fig. 1, two holding elements 7 are arranged on each connecting element 61, 62 in a uniform distribution on the flank circumference.

In the embodiment of Fig. 2, each holding element 7 is formed by a cylindrical pin 71. Each opening 330 in the flange 33 of the coupling half 3.2 is provided in the form of a blind bore forming a hole 331. A through hole in the leg wall 65 forming a through hole 66 is aligned with the hole 331, the holes 331, 66 being congruent. Starting from the hole opening on the outside of the leg wall 65 , the arrangement of the holes 66,231 extends obliquely in the direction of the housing 21 of the coupling half 2.2. The holes 66,231 are essentially aligned perpendicular to the leg wall 65. The flank or leg wall is directed relatively steeply in relation to the coupling axis 10.

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The holding element cylinder pin 71 fits into the holes 66, 231 in a form-fitting manner. It can be seen that a locking seat is formed between the leg wall 65 and the flange 33, which holds the clamp connecting element 61 or 62 in a firm clamping seat on the flanges 23, 33 and also secures it there.

As a result of the radial forces acting on the connecting element 61 or 62, each holding element cylinder pin 71 is in a clamping or clamping fit between the leg wall 65 and the flange 33. The sum of the clamping/clamping forces acting on the holding elements 7 must be overcome in order to pull the holding elements 7 out of the holes 331 in the flange 33. The holding force is overcome in each case by pulling force on the outwardly directed end of the holding element 7 in order to remove it from its locking position between the connecting element 61 or 62 and the flange 33. In Fig. 2, the cylinder pin 71 protrudes relatively far from the through hole 66 , from which it can be pulled out completely.

By means of a release device 8.2 forming a release means, all the holding elements 7 are removed at least almost simultaneously from their locking positions between the flange 33 and the connecting elements 61, 62. The holding elements 7 are thereby pulled out at least far enough that they release the separating surface between the flange 33 and the leg wall 65. The radial forces generated by the inclined surfaces of the trapezoid geometry then come into effect, which blast the connecting elements 61, 62 away from the flanges 23, 33. During this process, the spring-loaded closing valves 4, 5 close so that the separated coupling halves 2.2 and 3.2 are each closed against the passage of medium. It can be seen that a simple release mechanism is formed by the release device 8.2 and the holding elements 7, which are a securing means.

A release means, namely a release device 8, comprises two pairs of rope loops 81.1. The rope ends of each rope loop 81.1 are each connected to an associated pair of holding elements 7, wherein the loop rope is guided through a guide device 82. This comprises a pair of eyelets which are attached to the outer circumference of the fastening flange 12 of the coupling half 3, in a corresponding spatial arrangement with the associated pair of holding elements 7. All

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Rope loops 81.1 are of the same size. The ropes 81.1 are guided through the eyelets and are each attached to the end of the associated holding element 7. The radial distance of the eyelets from the coupling axis 10 is slightly larger than the radial distance of the leg holes 66 from the axis 10. As a result, the ropes 81.1 are guided towards the holding elements 7 in accordance with the inclined position of the latter in order to facilitate the inclined extraction. The ropes 81.1 are connected to a connecting rope 81.2 in the same rope arrangement, symmetrical to the coupling axis 10. This is connected in the middle to a breakaway rope (not shown), which leads to a stationary device and is attached there. The breakaway rope engages equally with the two rope loops 81.1. By applying a sufficiently large tension on the breakaway cable corresponding to a certain threshold value, the holding elements 7 are simultaneously released from their locking positions, so that each tensioning connecting element 61, 62 comes out of its connecting seat for separating and closing the coupling halves 2, 3.

In Fig. 1, the holding elements 7 are captively connected to the connecting elements 61, 62. For this purpose, the elements 7 are each designed with a head which is held captive in the wall 65. Such a seat is shown in Fig. 8. It can be seen that the connecting elements 61, 62 are held back on the coupling half 3 via connections closed by the loops 81.1 after they have been released from the flanges 23, 33.

In the embodiments according to Fig. 1 and 2, adjustment elements are arranged evenly distributed over the circumference on the leg walls 65 of the connecting elements 61, 62 equipped with the holding elements 7. These are adjusting screws 68 for adjusting the clamping and positive connection of the connecting device 6. As can be seen from Fig. 4, the screws 68 are arranged so that they are directed at least essentially perpendicular to the flange flank surface against which they come into contact.

It has proven particularly advantageous to provide the adjusting screws 68 on only one leg wall, namely on the leg wall 65 that introduces the holding elements 7. By means of the adjusting elements 68, which are provided on the flank of the flange 33 with adjustable

·

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Since the two retaining elements 7 are seated with a greater force, the positive connection between the connecting element 61 or 62 and the flanges 23, 33 as well as between these parts and each retaining element 7 can be adjusted by adjusting the position and changing the force to achieve the optimum connection effect. In particular, the tension or clamping force of the retaining elements 7 in their hole seat and thus the tensile threshold force of the release mechanism can be determined and/or adjusted using the adjusting screws 68.

Fig. 5 to 8 show connecting structures which have the trapezoidal shape of the adjacent flanges 23, 33 and the corresponding clamping connecting elements 61 and 62 described with reference to Fig. 1 and 2. These connecting structures can therefore be attached to the couplings in Fig. 1 and 2 with the modifications given below.

In the embodiment according to Fig. 5, the flange 33 is equipped with a through hole 331.1 parallel to the coupling axis 10 or the coupling direction. This hole 331.1 is aligned with an equally parallel through hole 66.1 in the leg wall 65. As a result, a holding element 7 is inserted in a form-fitting manner in a position parallel to the coupling axis 10 into the two holes 66.1, 331.1. The form-fitting connection is provided approximately halfway up the leg wall 65 above the coupling housing 13. The holding element 7 completely fills the holes 66.1, 67.1 and protrudes slightly from the leg wall 65. It is connected there to the cable part 81.1 of a release device. The cable 81.1 can be connected to the holding element 7 in a force-fitting and firm manner in any suitable manner. The holding element 7 can be formed by a round or cylindrical pin or by a plate-shaped bolt, wherein the holes 66.1, 331.1 are each dimensioned accordingly.

Fig. 9 shows a schematic view of a round/cylindrical pin in a top view of the leg wall 65, while Fig. 10 shows a plate-shaped bolt in a top view of the leg wall 65. The flat holding element in Fig. 10 is curved according to the circular circumferential extension of the connecting element 61 or 62. In order to facilitate the extraction of a plate- or disk-shaped holding element in particular, it is expedient to provide at least the hole 331.1 and optionally the hole 66.1 with

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at least one extraction bevel (not shown) with which the respective hole cross-section is slightly widened in the extraction direction.

In Fig. 6, both flanges 23, 33 are provided with a through hole 331.2 and 331.3 respectively. The two holes are aligned with each other and have the same cross-section. They extend parallel to the coupling axis 10 so that the associated holding element 7 is inserted parallel to the coupling axis 10 at about half the height of the leg. The leg wall 64, like the leg wall 65, is provided with aligned through holes 66.2. In this design, the holding element 7 extends completely through all the holes and thus through the flanges 23, 33 and the leg walls 64, 65.

Fig. 7 and 8 show embodiments of the positive connection according to the invention with holding elements 7, which are each integrated in a clamping connection element 61, 62. In Fig. 7, the positive connection is only formed on the flange 33 in a parallel position to the coupling axis 10. In Fig. 7, as in the embodiments according to Fig. 1 and 2, an oblique arrangement of the holding element 7 is provided, namely at an acute angle with respect to the coupling longitudinal axis 10.

In Fig. 7 and 8, the holding elements 7 are provided in the form of head bolts 72. When the holding element 7 is pulled out, the bolt head comes to rest in a hole in the leg wall 65, while the bolt shaft is guided through a smaller opening hole. In this way, the holding element 72 is held captive on the clamping connection element 61, 62. A compression spring 662 is expediently arranged in the head hole space, against the force of which the head bolt 72 can be guided out of its positive locking position from the parting plane between the flange 33 and the leg wall 65. The smaller opening hole is expediently part of a screw element 661 provided for assembly, as can be seen from Fig. 1. In this embodiment, the holding element 7 is held captive in the wall 65 by means of the screw element.

Claims (15)

1. Breakaway coupling ( 1 ) for sealingly connecting conveyor lines transporting liquid or gaseous media, comprising two coupling halves ( 2 , 3 ), at least one of which is equipped with valve means ( 4 , 5 ) blocking the media flow in the uncoupled state, and a connecting device ( 6 ) having at least one securing element ( 7 ) with which the two coupling halves ( 2 , 3 ) are detachably coupled to one another to produce a flow connection, wherein the connecting device ( 6 ) comprises flanges ( 23 , 33 ) of the coupling halves ( 2 , 3 ) joined together, at least one clamp-like clamping connecting element ( 61 , 62 ) producing the flange connection by means of a positive clamping fit on the abutting flanges ( 23 , 33 ) and detachable transversely to the coupling axis ( 10 ), the connecting element ( 61 , 62 ) comprises clamping means which fix the flanges and a release mechanism which is formed by a securing means ( 7 ) which secures the seat of the connecting element ( 61 , 62 ) and a release means ( 8 ) which triggers the detachment of the connecting element ( 61 , 62 ), characterized in that the positive clamping seat of each connecting element ( 61 , 62 ) on the flanges ( 23 , 33 ) is produced by at least one holding element ( 7 ) which passes through the wall of the connecting element ( 61 , 62 ) and which fits in a positive manner in at least one associated flange opening ( 230 ), thereby being in the locking seat, the holding element ( 7 ) forming a clamping and securing element which is connected to the release means ( 8 ) and which is used to detach the associated connecting element ( 61 , 62 ) can be removed from its locking seat between the connecting element ( 61 , 62 ) and the flange ( 23 ). 2. Breakaway coupling according to claim 1, characterized in that the abutting flanges ( 23 , 33 ) have a connecting cross-section which narrows outwards in the radial direction and is preferably trapezoidal, and that the connecting element ( 61 , 62 ) is designed with corresponding seating surfaces. 3. Breakaway coupling according to claim 1 or 2, characterized in that the coupling halves ( 2 , 3 ) are joined together against spring force. 4. Breakaway coupling according to one of claims 1 to 3, characterized in that the holding element is cap-shaped with leg walls ( 64 , 65 ) connected via a web ( 63 ) and that the flange opening ( 330 ) is formed by at least one hole ( 331 ) which is aligned with at least one associated hole ( 66 ) in at least one leg wall ( 65 ) of the holding element ( 61 , 62 ). 5. Breakaway coupling according to claim 4, characterized in that the flange hole is a through hole ( 331 ) which passes through the abutting flanges ( 23 , 33 ) for receiving a holding element ( 7 ) which passes through the holes in a form-fitting manner. 6. Breakaway coupling according to claim 4 or 5, characterized in that the holes ( 66 ; 331.2 , 331.3 ) receiving the holding element ( 61 , 62 ) extend at least almost parallel to the coupling axis ( 10 ). 7. Breakaway coupling according to claim 4 or 5, characterized in that the holes ( 66 , 331 ) receiving the holding element ( 61 , 62 ) extend obliquely in the direction of the coupling housing ( 13 ) starting from a hole opening at the end of the holding element ( 7 ) connected to the release means ( 8 ). 8. Breakaway coupling according to one of claims 4 to 7, characterized in that the holding element ( 7 ) is held captively on the connecting element ( 61 , 62 ), preferably in an associated hole in the connecting element ( 61 , 62 ). 9. Breakaway coupling according to one of claims 1 to 8, characterized in that the holding element ( 72 ) is a sliding element which can be released from its locking seat against spring force. 10. Breakaway coupling according to one of claims 1 to 9, characterized in that the holding element ( 7 ) is a cylindrical pin sliding element. 11. Breakaway coupling according to one of claims 1 to 9, characterized in that the holding element ( 7 ) is a plate-shaped sliding element, in particular curved according to the circumferential extent of the connecting element ( 61 , 62 ). 12. Breakaway coupling according to one of claims 1 to 11, characterized in that the connecting element ( 61 , 62 ) is a circular arc-shaped segment with a maximum circumferential extension of 180°, wherein preferably at least two such segments are arranged distributed on the circumference of the flange connection. 13. Breakaway coupling according to one of claims 1 to 12, characterized in that at least one adjusting element ( 68 ) for adjusting the clamping and positive connection between the connecting element ( 61 , 62 ) and the flanges ( 23 , 33 ) or between these parts and each holding element ( 7 ) is arranged at least on one wall of the connecting element ( 61 , 62 ), preferably on a leg wall (65) of a cap-shaped connecting element ( 61 , 62 ). 14. Breakaway coupling according to claim 13, characterized in that at least one adjusting element ( 68 ) is arranged only on the leg wall ( 65 ) of the connecting element ( 61 , 62 ), in which at least one holding element ( 7 ) is located in the through-fit seat between the connecting element ( 61 , 62 ) and the associated flange ( 33 ). 15. Breakaway coupling according to one of claims 1 to 14, characterized in that the release means ( 8 ) comprises cable means ( 81 ) guided on a coupling half ( 3 ), each holding part ( 7 ) being connected to a cable end for moving out of its locking seat.