DE29715725U1 - Swivel coupling, fire hose coupling and hose clamping device - Google Patents

Description

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970825 R-G-3940-DE

Swivel coupling, fire hose coupling and hose clamp device

The invention relates to a rotary coupling according to the preamble of claim 1, a fire hose coupling according to the preamble of claim 10 and a hose clamping device according to the preamble of claim 11.

When creating hose lines, at least one hose section is connected to a connector. Usually, however, several hose sections are put together. Both the connection to the connector and the connection of two hose sections involve a first connecting device that is attached to one end of the hose and can be detachably connected to a second connecting device of the connector or another hose section. The first connecting device must be simple in design and, when the hose lines are put together, ensure that they can withstand tensile stress and are also easy to handle.

The present invention relates, among other things, to connecting devices for pressure and suction hoses, which

differ from known designs by being particularly easy to operate, robust and particularly compact. Due to its special design features, the connecting device described here can be integrated into almost all bayonet couplings, such as couplings for fire hoses of sizes A, B, C or D'", in compressed air torque couplings and in various screw and plug couplings for high-pressure hoses.
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Known designs of rotary couplings are usually designed as additional devices that are inserted between two couplings and are therefore cumbersome and heavy. Many of the rotary couplings in use today become stiff as the pressure increases. Other defects that mainly occur with cheap products are stiffness, a limited service life due to unsuitable materials and sensitivity to dirt and mechanical stress. Problems with unruly hoses of all kinds are well known. Hoses with a large diameter (e.g. A-suction hoses used by firefighters), hoses with a large wall thickness for high pressures or special operating conditions, hoses made of less flexible materials and with steel mesh inserts, or hoses that stiffen as a result of high internal pressure all have one thing in common: they cannot be twisted or can only be twisted very slightly. These well-known unfavorable properties of hoses lead to problems at the connection and connection points on the one hand and impair the handling of connected devices on the other hand, even leading to the risk of accidents. Stubborn, often twisted hoses are difficult to untangle if they cannot be turned because they are firmly connected somewhere. Problems with twisted fire hoses are also well-known, problems that can often only be solved by time-consuming uncoupling and coupling.

Unruly hoses can accidentally open bayonet couplings due to their own rotation, which can lead to time losses during firefighting operations, property damage and accidents. Unruly hoses on work equipment such as jet pipes, fire extinguishing guns or pneumatic hammers lead to impairments in the handling of such equipment and increase the risk of accidents. Hose quick couplings are usually intended to enable quick coupling or uncoupling, if possible without the use of

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tools (example: fire service) and therefore cannot be fitted with arbitrarily stiff catches. This smooth engagement and disengagement makes bayonet quick couplings particularly susceptible to the hose rotating itself. In the problem cases mentioned, a remedy can be found by using an extremely smooth rotating coupling, which should be integrated into the quick coupling if possible.

To attach a hose end to known connecting devices, the hose end is pushed over a connector and secured with binding wire, hose ties or cuffs. Binding machines are required for assembly. This method of fastening is complex and cannot always guarantee the desired tensile strength. If it is tightened too tightly, the binding material can damage the hose and if it is not tightened enough, the hose can slip out. In addition, protruding parts, especially sharp edges or points, of binding wires, hose ties or cuffs lead to an increased risk of injury. The binding material can usually only be used once.

The invention is based on the task of finding a connecting device that is simply constructed and enables a secure connection and problem-free handling even with hose lines subject to tensile stress.

This object is solved by the features of claim 1, the features of claim 8 or the features of claim .

When solving the problem, it was recognized that the connecting device has a tensile strength, essentially dependent on the tensile

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or pressure load independent rotary coupling and/or a tensile hose clamping device.

A preferred embodiment of the connecting device comprises a rotary coupling with at least one ball bearing and a radial rotary seal, as well as a hose clamping device with an inner sleeve, an outer sleeve sitting on it as a union nut and a clamping sleeve, whereby a conical surface of the outer sleeve rests against a conical surface of the clamping sleeve and allows this to be pressed radially inwards against an inserted hose end by an axial movement of the outer sleeve. In order to greatly increase the clamping effect, radially extending projections protruding inwards are provided on the inside of the clamping sleeve and radially extending recesses adapted to the projections are provided on the outside of the inner sleeve, so that a clamped hose is deformed like a bellows. The resulting clamping is extremely tensile.

The radial rotary seal of the rotary coupling comprises two essentially cylindrical sliding surfaces that are associated with one another and run around the hose axis, with a first being formed on a sleeve-shaped coupling part and a second on a sealing ring. The sealing ring is constructed in two components, in particular in two parts. A first component forms a sliding surface that is low-friction when interacting with the first sliding surface. This first component is to be referred to as the sliding component. The other component is elastically deformable and has a sealing function. The fluid conveyed in the line comes into contact with the elastic component on one axially aligned side and presses it into a sealing receptacle with the pressure difference between the inside of the hose and the environment. The sealing receptacle is designed as an annular groove that is open to the inside or outside.

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formed. The elastically deformable component is referred to as the sealing component and prevents axial leakage of conveying fluid through the sealing area. To do this, the sealing component is slightly deformed by the fluid pressure, in particular, it is slightly compressed in the axial direction. This compression leads to an expansion in the radial direction and thus also to a compression of the sliding surfaces. This essentially seals the annular gap between the first sliding surface and the edge of the seal holder without leaking.

As already described, according to a special, independently usable inventive solution, a ring-shaped component, hereinafter referred to as the "seal carrier", is provided for accommodating both the static and the dynamic seal. This seal carrier should be able to be replaced as quickly and easily as possible and is therefore not screwed in according to a special, independent inventive idea, but is fixed by a snap mechanism which reliably holds the seal carrier in place even under harsh operating conditions and, on the other hand, reliably disengages when a certain axial force is exceeded (e.g. lifting with a tool) in order to release the seal carrier. In order to be able to meet these apparently contradictory requirements, a specially shaped snap ring was developed which resembles a triangle with curved sides. In contrast to conventional, round snap rings, the disengagement forces of this ring can be calculated very precisely or selected using the spring force and there is no risk of the ring becoming eccentric when the seal carrier is inserted. slipped and/or damaged or prevented from locking. In contrast to conventional snap rings, the special snap ring according to the invention is not pre-tensioned inwards but outwards and centers itself through its three-point support.

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In addition, the disengagement forces are many times higher than with round snap rings of the same wire thickness and diameter. The determining factor for the spring force is only one side length of the triangle and not the entire circumference.

In accordance with another independent invention, a special ball bearing was developed for the precise guidance of the rotating and stationary coupling parts relative to each other. It is similar to a single-row angular contact ball bearing, but according to the invention there is axial guidance in both directions. In order to achieve the highest possible load capacity with low structural dimensions, the bearing was designed as a full-ball, forceless bearing. Conventional full-ball bearings are always provided with a separable inner or outer ring in order to be able to fill the ball.

The invention, on the other hand, describes a full ball bearing with an undivided inner and outer ring. The outer ring is placed at an angle on the inner ring, which is fully filled with balls, and then pressed on using the elastic deformability of the material until it clicks into place. The relatively large radial play is then reduced to the correct size by pressing the bearing into the housing. The dimensions and materials are selected accordingly. This invention can easily be used for a hose coupling, since the concentricity properties of the balls or bearings are not subject to such high requirements as, for example, for a wheel bearing.

The described hose connection according to the invention using a clamp sleeve and union nut was designed in such a way that the hose is protected from damage by the edge of the union nut. When rolling up the hose after use (e.g. by the fire service), at least

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one end of the hose is usually carelessly dragged across the floor, whereby the fabric of the hose at the end of the hose cover is chafed during the usual hose binding. With the hose binding according to the invention, such damage is largely prevented, as only metal parts, not hose material, drag across the floor. The metal parts are also better suited to preventing injuries to operating personnel due to their special shape, as they do not have any protruding or wire-shaped elements.

The rotating coupling according to the invention, which is used not only between hoses but also in particular with hose distributors, further improves safety by ensuring that any torque on the hose does not lead to a change in the location or position of the distributor, as has previously been the case. Another advantage of the new solution compared to the known solution is that hoses can be laid more quickly without paying attention to their position. With conventional systems, a left-hand twist on a hose could inadvertently even open the coupling. Therefore, it was always necessary to make an effort to lay the hoses straight.

The drawings explain the individual inventive ideas using exemplary embodiments. However, the invention is not limited to them.

Fig. 1 a longitudinal section through a rotary coupling with a one-piece hose contact part, Fig. 2 a longitudinal section through a rotary coupling with two

Ball bearings
Fig. 3 a longitudinal section through a rotary coupling with a three-part hose clamp device

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Fig. 4 a longitudinal section and a partial side view

a fire hose coupling Fig. 5a a longitudinal section and a partial side view of a slotted clamp sleeve
Fig. 5b is a front view of the clamping sleeve according to Fig.

5a
Fig. 6 a partial longitudinal section through a rotary coupling for fire hoses

Fig. 7a an enlarged section of Fig. 1 Fig. 7b View of a new type of round wire snap ring (snap closure)
Fig. 8 a longitudinal section through a new type of semi-assembled ball bearing of the rotary coupling

Fig. 9 a longitudinal section through the pressed-in ball bearing ■ Fig. 10 the view of a rotary coupling for fire hoses with the hose connection according to the invention and in a typical position

Fig. 1 shows a rotary coupling with a one-piece hose contact part 1, preferably a hose nozzle, on which an inwardly open, radial groove 20 is provided, in which a special sealing ring 3, 4 is arranged in such a way that it statically seals with the elastomeric outer side E at the base of the groove and slides with the inward-facing PTFE running surface P on the peripheral surface of the counterpart 2a. At least one roller bearing 5, 5a, 5b arranged in the immediate vicinity of the sealing ring 3, 4 ensures precise guidance of the parts 1 and 2a to one another and absorbs the axial and radial forces. This roller bearing is protected from dirt and sand by an external dirt scraper ring 6.

A hose end 8 pulled over the hose contact part 1 is secured by means of binding wire 21. In the counterpart 2a, a front groove 22 is formed for receiving a front seal 9.

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forms* The rolling bearing parts 5a, 5b are connected to the counterpart 2a via a connecting device 7. The counterpart 2a is held by a snap ring 24 on the connecting device 7, which is connected to the bearing part 5a via a thread 25. Engagement elements 7a are formed on the connecting device 7, which enable a firm engagement with a corresponding connecting part .

The joints F between the moving parts gape open towards the medium in order to immediately release any foreign bodies such as grains of sand that enter and not grind them together. The rotary coupling is used in particular with tank filling hoses for heating oil, with compressed air torque couplings, or with high-pressure hoses, in particular with screw couplings for the same.

The construction shown in Fig. 2 is particularly intended for high pressures. The sealing ring 3, 4 is held on the free end of the hose contact part 1 by means of a pre-inserted disk 12 and locking ring 13. The exposed, elastomeric outer side E of the sealing ring 3, 4 simultaneously serves as a static seal against the counterpart 2a when the counterpart 2a is screwed in by means of the thread 25a. The seal holder 20 is formed by the bearing part 5a, the disk 12 and the adjacent inner surface of the counterpart 2a. In addition to the bearing 5 placed in the immediate vicinity of the sealing ring 3, 4, a second roller bearing 10 is arranged axially offset, which absorbs mainly radial forces acting from the outside. A dirt scraper ring 6 is fitted outside this second roller bearing 10, which protects the two roller bearings 5, 10 from dirt and sand. To clamp the hose end 8, a

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Contact part 1 and above the hose end 8 a clamping sleeve 14.

Fig. 3 and 4 show a further compact embodiment of the rotary coupling according to the invention using a fire hose coupling. The rotary part 2 comprises a seal carrier ring 2b, a bayonet lock 7 and an outer bearing ring 5a. The seal carrier ring 2b receives the static front seal 9 - a lip ring - on the front side and the two-part rotary seal or the sealing ring 3, 4 radially. The seal carrier 2b is fixed in its longitudinal direction by a snap lock, preferably a wire snap ring 15 and is supported on the snap ring 16 after the bayonet lock 7 has been engaged. The seal carrier 2b has an inwardly open, radial groove at its inner end, in which the two-part rotary seal 3, 4 is arranged in such a way that it statically seals at the base of the groove with its elastomeric outer side E and slides with the inward-facing PTFE or Thordon running surface P on the smooth circumferential surface of the projecting bearing inner ring la when the latter is rotated. The bearing inner ring la, together with the balls 5 and the bearing outer ring 5a, forms an angular contact ball bearing which absorbs the axial and radial forces and ensures precise guidance of the bearing inner ring la.

The end of the bearing inner ring la opposite the rotary seal is firmly connected to the inner sleeve Ib or a hose nozzle or a hose clamping device via a screw connection 27. The inner sleeve Ib has at least one, but preferably several, radial grooves R on its outside for anchoring the hose end 8 and carries an outer sleeve 17 designed as a union nut via a sliding thread 26.

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Between the outer sleeve 17 and the cylindrical end of the bayonet lock 7 there is an easily rotatable dirt scraper ring 6, which protects the angular contact ball bearing 5 from the ingress of dirt and sand. 5

In contrast to conventional hose fittings, the hose 8 is not clamped with binding wire, hose ties, cuffs, etc., but by slipping over and screwing the outer sleeve 17 with integrated collet or clamping sleeve 18. The longitudinal screw force of the outer sleeve 17 is transferred via a sawtooth-like profile S on its inside to the outside Sp of the flexible clamping sleeve 18 with the same profile and converted into a radially acting force, whereby the flexible clamping sleeve 18 is compressed and with its profiled inside or the radial elevations R' presses the hose 8 into the congruent profile or the radial depressions R of the inner sleeve 1b. The interacting sawtooth-like profiles each comprise at least one conical partial surface. This hose connection has a number of advantages over conventional types of connection and is also new and inventive regardless of the rotary coupling. It reduces the risk of injury by consistently avoiding sharp edges and protruding parts such as wire ends, buckles and screws. Installation is quick and easy and does not require any binding machines. It protects the hose material by providing gentle transitions from "hard" to "soft". The hose 8 is so tightly fitted that it can only be torn off with force but not pulled out.

Fig. 4 shows the grip ribs 28 required for screwing the outer sleeve 18.

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Fig. 5a and 5b show a clamping sleeve 18 with five conical partial surfaces 18a formed on the outside and five radially extending elevations R' formed on the inside. In order to enable the clamping sleeve 18 to be compressed, axially extending slots 29 are formed alternately from the two end faces.

These embodiments thus show in summary: A rotary coupling for the rotatable and leak-free connection of hoses 8 to a connection, with a hose contact part 1,1b and a rotary part 2 rotatably connected thereto, comprises between the hose contact part 1,1b and the rotary part 2 at least one ball bearing 5,10 and a radial rotary seal with a two-component, in particular two-part, sealing ring 3,4, wherein the sealing ring 3,4 comprises a low-friction sliding component 3 and an elastically deformable sealing component 4. The radial rotary seal comprises two essentially cylindrical sliding surfaces that are associated with one another and run around the hose axis, with a first sliding surface being formed on a first sleeve-shaped coupling part 1a,2a and a second sliding surface on the sliding component 3 of the sealing ring 3,4, which sealing ring 3,4, in particular its sealing component 4, is arranged in a sealing receptacle 20 of a second sleeve-shaped coupling part 1,2b, in particular an annular groove that is open to the inside or outside, so that fluid conveyed in the line comes into contact with the sealing component 4 on one axially aligned side and presses it sealingly against the inner surfaces of the sealing receptacle 20 with the pressure difference between the inside of the hose and the environment. The hose end 8 can be connected to the coupling via a hose clamping device 1b,17,18. The clamping device Ib,17,18 comprises an inner sleeve Ib, an outer sleeve 17 sitting thereon as a union nut and a clamping sleeve 18, wherein a

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Conical surface S of the outer sleeve 17 rests against a conical surface Sp of the clamping sleeve 18 and allows this to be pressed radially inwards against the inserted hose end 8 by an axial movement of the outer sleeve 17. In order to greatly increase the clamping effect, radially extending projections R' projecting inwards are provided on the inside of the clamping sleeve 18 and radially extending recesses R adapted to the projections are provided on the outside of the inner sleeve 1b, so that a clamped hose 8 is deformed like a bellows. The resulting clamping is extremely tensile.

Fig. 6 shows a rotary coupling for fire hoses according to the invention, partially cut open in the area of the seal carrier 2b. As already described above, the seal carrier 2b is fixed in its longitudinal direction by a wire snap ring 15. This can have a new special shape or be of conventional design. Fig. 6 also shows how the seal carrier 2b can be easily released from its anchorage using two levers (e.g. screwdriver). The seal carrier 2b is inserted by applying strong pressure or by hitting it with a wooden or plastic hammer.

Fig.7a shows an enlarged section of Fig. 6 with the snap mechanism (snap ring 15) which fixes the seal carrier 2b in relation to the bayonet lock part 7 in its longitudinal direction.

Fig.7b shows a top view of the new type of snap ring 15 as well as a cross-section of the center plane of the snap ring through parts 7 and 2b. The snap ring 15, which resembles a triangle with curved sides, is supported at three points on the base of the inwardly open, radial groove in the bayonet lock part 7 and is thereby centered to the hole. At three further points, evenly distributed around the circumference

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The sides of the triangle of the snap ring 15 engage in the groove of the seal carrier 2b. The angle of engagement to the longitudinal axis is approximately 20-40°. In addition to the choice of material and the density of the ring, this angle is one of the determining factors of the disengagement force.

Fig.8 shows the new, preferred expanded special ball bearing in the assembly phase. The outer ring 5a is placed at an angle on the inner ring 5a, which is fully equipped with balls 5, in the manner shown and then pressed on in the direction of the arrow. The balls can be coated with grease to ensure adhesion.

Fig.9 shows the special ball bearing (la, 5u, 5a) pressed into the bayonet lock 7. The radial stresses resulting from the tight press fit between the bayonet lock 7 and the bearing outer ring 5a slightly compress the bearing outer ring 5a, whereby the radial play of the bearing is reduced or correctly adjusted. 20

Fig.10 primarily shows the protective function of the union nut 17 under operating conditions. The hose coupling and hose are shown in the typical position they assume when the hose is pulled in (dragging over the ground). It is clearly visible that only the metal parts such as the bayonet lock 7 or union nut 17 drag over the ground, but not the hose, as is often the case with conventional hoses.

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Summary

The invention relates to a rotary coupling for the rotatable and leak-free connection of hoses to a connection or a fire hose coupling, wherein the couplings have at least one ball bearing and a rotary seal. The invention further comprises a hose clamping device for holding a hose end to an inner sleeve in a leak-free manner.
. Fig. 1

Claims (12)

970825 " *" ** *R-(j-3940-DE Protection claims 1. Rotating coupling for rotatable and leak-free connection of hoses (8) to a connection, with a hose Contact part (1, Ib) and a rotatably connected
Rotating part (2), characterized in that between the
Hose contact part (1, Ib) and the rotating part (2) at least
a ball bearing (5, 10) and a radial rotary seal with a two-component, in particular two-part,
Sealing ring (3, 4) are arranged, wherein the sealing ring (3, 4) comprises a low-friction sliding component (3) and an elastically deformable sealing component (4). 2. High-pressure coupling with a rotatable connector, preferably a hose nozzle (1) and a counterpart (2), characterized in that the static pressure seal (E) is provided with a sliding surface opposite the connecting piece
(1) between an outer circumference of the connector (1) and an inner circumference of the counterpart (2)
is, whereby the pressure guide between the connector (1) and the counterpart (2) is selected so that the pressure seal (E) is pressurized radially against the connecting piece (1)
and that the sliding surface is formed or arranged on a significantly tapered outer diameter of the connecting piece (1). 3. Coupling according to claim 1 or 2, characterized in
that the radial rotary seal comprises two essentially cylindrical,
associated with each other, around the hose axis running sliding surfaces, wherein a first sliding surface
on a first sleeve-shaped coupling part (la, 2a)
and a second sliding surface are formed on the sliding component (3) of the sealing ring (3, 4), which sealing ring
(3, 4) , in particular its sealing component (4), in a seal receptacle (20) of a second sleeve 970825 ~ "R-G-3940-DE - 16 - sensing coupling part (l,-2b), in particular an annular groove open to the inside or outside, is arranged, so that fluid conveyed in the line comes into contact with the sealing component on one axially aligned side (4) and presses it sealingly against the inner surfaces of the sealing receptacle with the pressure difference between the inside of the hose and the environment. 4. Coupling according to claim 3, characterized in that the seal receptacle (20) in the rotary part (2) or optionally is formed in the hose contact part (1, 1b), whereby one of these two parts encloses the other in the area of the seal receptacle (20) and the passage openings in both parts are essentially aligned. 15 5. Coupling according to one of the preceding claims, characterized in that the sliding component (3) forms a PTFE, in particular a Thordon sliding surface and the sealing component (4) consists at least partially of an elastomer. 6. Coupling according to one of the preceding claims, characterized in that the hose contact part (Ib) is connected, preferably screwed, as part of a hose clamping device to a first bearing part (la), the rotating part (2) comprises a second bearing part (5a) and a connecting device (7) connected thereto, and the balls (5) of the ball bearing are arranged between the two bearing parts (la, 5a). 7. Coupling according to claim 6, characterized in that the hose clamping device comprises an inner sleeve (Ib), an outer sleeve (17) and an intermediate clamping sleeve (18), wherein the outer sleeve (17) is slidably attached to the inner sleeve (Ib) with a thread (26) and S* »S* ~ i &Ggr;: : 970825 R-6-3940-EN - 17 - at least one conical surface (S) of the outer sleeve (17) rests on a conical surface (Sp) of the clamping sleeve (18) and a hose (8) inserted between the inner sleeve (Ib) and the clamping sleeve (18) can be clamped. 5 8. Coupling according to claim 7, characterized in that the clamping sleeve (18) is axially slotted and/or the outside of the inner sleeve (1b) is provided with at least one radially extending recess (R) or elevation and the inside of the clamping sleeve (18) is provided with at least one positively corresponding, radially extending elevation (R') or depression. 9. High-pressure coupling according to one of the preceding claims, characterized in that the pressure seal is formed in two parts and has an elastomeric outer side (E) for static sealing against the counterpart (2) and radially inside the elastomeric outer side (E) • a PTFE running surface (P) is arranged, the sliding surface of which slides on a smooth circumferential surface of the connecting piece (1). . Fire hose coupling for leak-free connection of hoses (8), with a hose contact part (1, 1b) and a connection device (7) connected thereto, characterized in that a rotary bearing with at least one ball bearing (5, 10) and a rotary seal are arranged between the hose contact part (1, 1b) and the connection device (7). 11. Hose clamping device for holding a hose end (8) with an inner sleeve (Ib) and an outer sleeve (17) in a leak-free manner, whereby the hose end (8) can be inserted between these parts, characterized in that between the inner sleeve (Ib) and the outer sleeve (17) a 970825 " ~R-G-3940-DE Clamping sleeve (18) is arranged, the outer sleeve (17) is slidably fastened to the inner sleeve (Ib) with a thread (26) and at least one conical partial surface (S) of the outer sleeve (17) rests against a conical partial surface (Sp) of the clamping sleeve (18), wherein a hose end (8) inserted between the inner sleeve (Ib) and the clamping sleeve (18) can be clamped by the displacement of the outer sleeve (17). 12. Hose clamping device according to claim 11, characterized in that the clamping sleeve (18) is axially slotted and/or the outside of the inner sleeve (1b) is provided with at least one radially extending recess (R) or elevation and the inside of the clamping sleeve (18) is provided with at least one positively corresponding, radially extending elevation (R') or depression. . Coupling locking device, in particular on a coupling according to one of claims 1-10, characterized in that it comprises a snap ring (15) as a locking element, which comprises a wire bent approximately triangularly, the sides of the triangle being bent outwards.