A coupling device for connecting a load to a sling by means of a support bolt

Abstract

To provide a coupling device with a simple structure capable of being assembled without using any tool and executing installation of a closed rope easily in a rapid manner.SOLUTION: In a ring holder 4, a lower side of the ring holder 4 is covered by an end part flange 12 at a lower end part of a sleeve 11 that is fixed to a support bolt 6 by a tensile force in an axial direction to be released. At least one locking member 18 for a bolt head part 7 is provided on the ring holder 4 so as to inhibit the bolt head part 7 with respect to the rotation at a locking position and so as not to be engaged with the bolt heat part 7 at an initial position. The support bolt 6 is supported by a ball bearing 9 in a through opening 15 of the ring holder 4. A suspension tool 2 is constructed as an opening ring. Two end part regions of the suspension tool 2 are respectively bent in directions facing each other and respectively extended at the sides facing each other in a radial direction in a recessed part formed in the ring holder 4 which is opened downward in respective cases in an assembled state.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a coupling device for connecting a load to a sling by means of a support bolt, the support bolt being positioned within a through opening in a ring holder so that it can be rotated about its longitudinal axis, the coupling device having a threaded shaft and a bolt head that protrudes radially beyond the threaded shaft and can also be rotated together with the threaded shaft relative to the sling with the connected load. [Background technology]

[0002] Such coupling devices, in which a support bolt having a threaded shaft for coupling to a load intended to be received can be guided through a through opening in a coupling component attached to the lifting device or coupled to the load, are known and commonly used in many different configurations.

[0003] Thus, Patent Document 1 describes such a coupling device in the form of an annular screw. In this coupling device, a through-opening for the support bolt is provided in the coupling component. The coupling component is itself formed on the lifting device. The bolt head of the support bolt is supported on the upper side of the coupling component, below the bolt head, on an abutment surface of the coupling component that extends around the through-opening. In this example, at least one locking member is provided. The at least one locking member can be engaged or disengaged with the bolt head and, in a locked position, blocks the bolt head in the direction of rotation, while in another position, the bolt head is again released. These locking members no longer require the use of a separate tool for actuating the locking member, achieving a very space-saving design. As a result, this known coupling device can be used even when only a small space is available. In this example, as a result of such a locking member, a relatively large torque can also be transmitted by the lifting device in the direction of rotation of the support bolt.

[0004] However, with this known connecting device, it is not possible to hang a closed sling (such as a cable loop, a textile loop, or the like) on the sling. In addition, with this known ring screw, it is not possible to perform orientation of the support bolt toward the load by preventing rotation of the bolt head with at least one locking member located in the locking position. As a result, when this ring screw can be used, it is not possible to fully screw in the ring screw, or it may even be unscrewed.

[0005] In other known coupling devices (Patent Documents 2 and 3), slings in the form of open rings are used. The end regions of the slings are oriented towards each other. The slings engage, in each case at the side of the through-opening, in openings located in ring holders, in which through-openings for support bolts are formed. In these configurations, the slings in the form of open rings can be exposed by suspending a closed sling and then removing the ring holders and the support bolts in order to reassemble the completed overall configuration. However, in this example, these known coupling devices have a relatively complex overall structure. For this reason, the construction and installation of the ring holders with support bolts is extremely complex and difficult, resulting in high costs.

[0006] In these couplings, the support bolts mounted in ring holders are held to the sling by using components that can rotate relative to one another when a load is attached to the support bolts. The configuration allows the support bolts to be rotated relative to the sling around their central axis even when a load is threaded onto them, thereby enabling the support bolts to be oriented toward the load. However, in this example, when a heavy load is coupled to the support bolts during directional movement, large frictional forces can occur between the sliding components. This frictional force carries the risk of undesirable wear. When a torque is applied to the support bolts against their threading, this can, in certain circumstances, cause the support bolts to rotate in the unthreading direction.

[0007] A coupling device of the aforementioned type is known from Patent Document 4. In this coupling device, the bolt head of the support bolt is located in a recess of a ring holder. The ring holder is itself rotatably supported on the connecting element. The ring holder is pivotally connected to the sling via the connecting element. In this example, the ring holder is connected to the connecting element via a ball bearing in an area axially above the bolt head. Orientation of the support bolt toward the suspended load can be achieved by the relative rotation of the ring holder with respect to the connecting element. Only relatively small friction forces are generated. However, with this known coupling device, assembly to the intended load cannot be performed without tools, since for this purpose a secure locking connection between the bolt head and the connecting element must be created during the screwing operation. Furthermore, installation of a closed sling is not possible. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] European Patent No. 2646698B1 [Patent Document 2] U.S. Patent No. 7,114,872 B2 [Patent Document 3] European Patent No. 0462963B1 [Patent Document 4] German Patent Application Publication No. 4336779A1 Summary of the Invention [Problem to be solved by the invention]

[0009] Based on this, the invention is based on developing such a coupling device that, with a particularly simple structure, allows it to be assembled without tools to the load intended to be received, and in such a way that the installation of the closed sling can be carried out in a simple and quick manner. [Means for solving the problem]

[0010] To this end, coupling devices of the type mentioned at the beginning: - a ring holder, the ring holder being a sleeve that can be rotated about a support bolt and that is covered on its underside by a radially projecting end flange at the lower end of the sleeve that is releasably fixed to the support bolt by axial tension; - at least one locking member provided on the ring holder, capable of being engaged with the bolt head and being movable to a locked position and an initial position, wherein in the locked position the at least one locking member prevents the bolt head from rotating relative to the ring holder and in the initial position the at least one locking member does not engage with the bolt head; - a support bolt supported in a through opening of the ring holder by a ball bearing; - a sling constructed as an open ring, the two end regions of which in each case extend towards one another and, in the assembled state, extend on diametrically opposite sides into recesses formed in the underside of the ring holder, which in each case open downwards in the ring holder; is provided.

[0011] First, the coupling device according to the present invention has a relatively simple structure that allows for quick removal of the ring holder from the two end regions of the lifting device using a support bolt and a locking member.

[0012] In the assembled state, even when the coupling device according to the invention is not coupled to any load intended to be received, it forms a sealed unit radially covered on the underside of the ring holder by the radially protruding end flanges of the sleeve, which is releasably fixed to and can be rotated about the support bolt. In this state, the two end regions of the sling, constructed as open rings, extend on opposite sides into recesses formed in the ring holder and opening downwards, and these end regions can be covered by the radially protruding end flanges of the sleeve so that they cannot escape downwards from these open recesses.

[0013] However, if a closed sling is intended to be hung on the sling, it is only necessary to pull down the sleeve, which is releasably fastened to the support bolt by axial tension, and remove the sleeve from the support bolt by means of its end flanges. This opens downward the open recesses in the ring holder, into which the end regions of the sling are received. In this state, the ring holder can also be pulled upward together with the support bolt from these end regions of the sling, and then removed.

[0014] Now, with the remaining sling, with its open portion between the two end regions of the sling, the desired closed sling can be introduced into the inner region of the surface enclosed by the sling. The ring holder with the two lower open recesses can then be repositioned on the end region of the sling together with the support bolt, after which a sleeve with radially protruding end flanges is inserted and pressed onto the support bolt from below until the sleeve is again (releasably) fixed in its assembly position on the support bolt. As a result, the original assembled state of the entire coupling device is again achieved. However, the desired closed sling is now hanging from the sling.

[0015] At least one locking member is attached to the ring holder, and the locking member can be engaged with the bolt head. The locking member can be moved between a locking position and an initial position where the locking member no longer engages with the bolt head, and no longer requires a separate tool for activation. As a result, by rotating a sling for connecting a load intended to be received to the support bolt to move the at least one locking member to its locking position, the coupling device of the present invention can be threaded into a threaded hole attached to the load or inserted into the load through a receiving hole. A nut can be used to apply tension to the load at the free end of the support bolt. In this example, it is easily possible to introduce a relatively large torque from the sling in the direction of rotation of the support bolt.

[0016] The support bolt is supported directly in the through-opening of the ring holder by means of a ball bearing, so that when the support bolt is not prevented from rotating in the through-opening by at least one locking member, it is also possible to perform very easy rotation of the support bolt in the ring holder and, as a result, easy orientation of the support bolt in the direction of the load in the suspended load.

[0017] If at least one locking member is constructed on the ring holder, in a very particularly preferred manner the locking member is constructed as a tilting lever which can be easily tilted by hand by the operator.

[0018] The construction of the support bolt can be carried out in any suitable manner, but in a particularly preferred manner the bolt head is constructed in a hexagonal shape when viewed from above.

[0019] The support bolt is further preferably supported by a ball bearing in the region of the support bolt between the underside of the bolt head and the beginning of the threaded shaft of the support bolt in the through opening of the ring holder, in this example the support bolt is advantageously provided with a guide groove in which the balls of the ball bearing move.

[0020] A particularly preferred embodiment of the coupling device according to the invention also involves the insertion of a snap ring for the connection between the support bolt and the sleeve in the assembled state, which can be released by axial tension. The snap ring is preferably expanded by an inclined starter attached to the shaft of the support bolt at its location on the radial bead into a peripheral receiving groove arranged for the snap ring on the inside of the sleeve both when the sleeve is axially attached to the shaft and when the sleeve is axially removed from the shaft. This allows the snap ring to be guided in the subsequent axial relative movement of the sleeve and the support bolt via the radial bead on the support bolt shaft until it reaches a fixed position behind the radial bead, or to release the fixed position when axial tension is generated. The axial tension intended for use in this example is very small and can generally be easily applied by hand.

[0021] As a result of the present invention, a coupling device is provided that, with a surprisingly simple structure, allows for easy orientation of the support bolt in the direction of the suspended load. Furthermore, the support bolt can be rotationally blocked by the bolt head on the ring holder without the use of tools. As a result of the use of at least one locking member, a relatively large torque can be transmitted to the support bolt via the lifting device.

[0022] The use of a sleeve, which in the assembled state is fixed to the support bolt and which can be released from the fixation on the support bolt by axial tension and which covers the underside of the ring holder by means of an end flange projecting at the lower end of the sleeve, makes it possible to achieve a sealed structure of the coupling device according to the invention in the assembled state. In this example, due to the prevention of rotation of the support bolt in the locked position of at least one locking member, the screwing of the threaded shaft of the support bolt into a corresponding receiving thread formed in the load intended to be received or the insertion of the support bolt into a through opening in the load and the screwing of a retaining nut in the end region of the support bolt projecting on the opposite side of the load can be carried out directly in this example without the need for tools.

[0023] In principle, the invention will be explained in more detail below by way of example with reference to the drawings, in which: [Brief explanation of the drawings]

[0024] [Figure 1] 1 is a perspective overall view of a coupling device according to the invention with two locking members for the head of a support bolt that is not in the locked position; [Figure 2] 2 is a cross-sectional view of the coupling device of FIG. 1, with the cutting plane lying in the clamping plane of the central axis of the lifter. [Figure 3] 3 is a cross-sectional view of the arrangement according to FIG. 2 according to section AA. [Figure 4] 2 is the coupling device of FIG. 1 but showing the sleeve pulled downwards and the ring holder lifted upwards from the two end regions of the sling; [Figure 5] FIG. 10 is an enlarged perspective view of the support bolt with the sleeve pulled out axially downward. [Figure 6] FIG. 10 is an enlarged cross-sectional view of a detailed cutaway of the sleeve with the snap ring when it is axially pressed onto the support bolt before reaching the fixed end position. [Figure 7] 7 is a cross-sectional view according to FIG. 6, but with the sleeve reaching its assembly end position on the support bolt. DETAILED DESCRIPTION OF THE INVENTION

[0025] In the following description of the figures, an embodiment of the coupling device according to the invention is illustrated, the same reference signs in different figures always refer to the same components.

[0026] Figure 1 is a side perspective view of a coupling device 1 according to the invention in an assembled state. Figure 2 shows a cross-section of the coupling device 1 of Figure 1, with the cutting plane running parallel to the clamping plane of the lifting tool 2 and through the axis of rotation of the support bolt.

[0027] Finally, FIG. 3 illustrates another cross-sectional view along cross-sectional location AA (as shown in FIG. 2).

[0028] As can be seen in particular in the cross-sectional view of FIG. 2, the sling 2, which allows the entire coupling device 1 with the load 10 attached thereto to be connected to a suitable lifting device, is constructed in the form of an open ring.

[0029] The two end regions 3 of the sling 2 between which the open loop is located are constructed so as to be bent towards each other by one of the two side members 2.1 or 2.2 of the sling 2 in each case, as shown in detail in FIG. 2 (or also in the description of FIG. 4). In the illustrated embodiment, the curved portions of the end regions 3 extend from the respective side members 2.1 or 2.2 so that these end regions 3 are positioned perpendicular to the side members 2.1 and 2.2. In this case, the construction of the end regions 3 is carried out so that the end regions 3 are oriented symmetrically with respect to the longitudinal axis of the sling 2 located at the cutting position AA shown in FIG. 2.

[0030] The connecting device 1 further includes a ring holder 4. The ring holder 4 has two downwardly opening recesses 5 on its underside, diametrically opposed to each other. In the assembled state, one of the end regions 3 of the sling 3 extends radially into each of the opening recesses 5. In this regard, reference may be made in particular to the description of Figures 2 and 4.

[0031] In this example, each of the recesses 5 is constructed with a cross section slightly larger than the cross section of the protruding end region 3 of the sling 2 .

[0032] A through opening 15 is provided in the center of the ring holder 4, extending axially through the ring holder 4. The support bolt 6 is positioned in the through opening 15 so that it can be rotated about its longitudinal axis.

[0033] As shown in FIG. 1, the support bolt 6 has a bolt head 7 at its upper portion and a threaded shaft 8 that is spaced axially from the bolt head 7 and protrudes axially by a predetermined length below the ring holder 4 when the connecting device 1 is in an assembled state.

[0034] The bolt head 7 adjoins the unthreaded portion 13 of the support bolt 6 inside the through opening 15. The support bolt 6 is supported and held in the through opening 15 of the ring holder 4 by a ball bearing 9.

[0035] The coupling device 1 further includes a sleeve 11 that is axially inserted onto the threaded shaft 8 from below. The sleeve 11 has a radially protruding end flange 12 at its lower end. The diameter of the end flange 12 is large enough that, in the fully mounted state of the sleeve 11, the flange 12 covers the underside of the ring holder 4 and, in this example, also covers the two recesses 5 below the ring holder 4, such that the end region 3 of the sling 2 inserted in the recesses 5 can no longer be moved out of the recesses 5.

[0036] The upper side of the ring holder 4 is provided with a surface 14 that extends around the periphery of the through opening 15. The surface 14 is very closely spaced from the underside of the bolt head 7 when the support bolt 6 is assembled. The support bolt 6 is connected to the ring holder 4 by a ball bearing 9. The balls of the ball bearing 9 are partially received in guide grooves 16 formed in the unthreaded portion 13 of the support bolt 6 and partially received in associated receiving grooves 17 provided in the through opening 15 of the ring holder 4.

[0037] Therefore, by means of the ball bearing 9, the support bolt 6 is not only rotatably supported in the through opening 15 of the ring holder 4, but is also connected to the ring holder 4. Therefore, when the bolt head 7 of the support bolt 6 is not prevented from rotating due to the small gap between the underside of the bolt head 7 and the surface 14 at the top of the ring holder 4, slight rotation of the support bolt 6 relative to the ring holder 4 is ensured with a small frictional force.

[0038] As can be seen from the illustrations of Figures 1, 3 and 4, two opposing locking members in the form of tilting levers 18 are attached to the upper side of the ring holder 4 on either side of the hexagonally constructed bolt head 7, and are positioned symmetrically relative to the clamping plane of the inner opening of the lifting device 2. As can be seen in the figures, each of these tilting levers 18 is positioned on a rotation axis 19 which is connected to the ring holder 4 on either side of the tilting lever 18 by means of bearing blocks 20 in each case.

[0039] In this example, the arrangement of the tilt levers 18 and bearing blocks 20 is constructed so that when each tilt lever 18 is pivoted inward from its initial position (shown in Figures 1, 3 and 4) in a direction towards the bolt head 7, it moves at a point so that the lever member 21 abuts against a hexagonal side surface 22 of the bolt head 7, thereby assuming a locked position at which it forms an operative connection with the associated hexagonal side surface 22 of the bolt head 7. As a result, the locked position of the tilt lever 18 is achieved, where the end face of the lever member 21 located in the rotational direction abuts against the surface 14 on the ring holder 4.

[0040] In this way, by forming this locking position, the tilt lever 18 can be tilted inward toward the bolt head 7, thereby preventing the support bolt 6 from rotating. This can be easily done by hand.

[0041] Only when the tilting lever 18 is tilted again to its initial position folded outward, as shown in Figures 1, 3 and 4, is the bolt head 7 again released in the rotational direction and can then be rotated relative to the ring holder 4 via the ball bearing 9.

[0042] Figure 5 shows an enlarged view of the support bolt 6 in an exploded state. At this point below the threaded shaft 8, there is also shown a sleeve 11 which can be press fitted onto the threaded shaft 8 by means of a lower circular radially extending end flange 12.

[0043] As can be seen in Figure 5, the underside of the bolt head 7 is adjacent to the unthreaded portion 13 of the support bolt 6. A guide groove 16 is provided in the unthreaded portion 13 slightly above the center of the axial length of the unthreaded portion 13. Half of the ball of the ball bearing 9 is engaged in this guide groove 16. Figure 5 shows the ball of the ball bearing 9 in this engaged state. The other radially outer half of the ball is received in an accommodation groove 17 formed in the through opening 15 of the ring holder 4 (Figure 4).

[0044] A small diameter shaft portion 23 is located between the unthreaded portion 13 of the support bolt shaft and the threaded shaft 8 attached to the axial end region of the unthreaded portion 13. Axially adjacent to this shaft portion 23 is the threaded shaft 8 (FIG. 5).

[0045] As already mentioned, in the assembled state of the coupling device 1 according to the invention, the sleeve 11 is displaced axially from the free end of the threaded shaft 8 over the threaded shaft until it assumes a fixed position, as shown, for example, in Figures 1 and 2.

[0046] In this regard, reference is now made to the description of Figures 6 and 7, which show enlarged cross-sectional details of a portion of the support bolt 6 and of the sleeve 11 pressed upward onto a portion of the support bolt 6. In Figure 6, the sleeve 11 has already been pressed upward onto the threaded shaft, but has not yet reached its fixed end position.

[0047] 7 shows the state in which the sleeve 11 is completely pressed upward onto the shaft of the support bolt 6 and is positioned when the sleeve 11 reaches a fixed position relative to the support bolt 6.

[0048] 6 and 7, in the region of the shaft portion 23 extending between the unthreaded portion 13 and the threaded shaft 8, the shaft portion 23 is formed with a radially extending annular bead 24. The outer peripheral edge of the annular bead 24 has a radial diameter that is constructed slightly smaller than the inner diameter of the sleeve 11.

[0049] The inner surface of the sleeve 11 is formed with an annularly extending peripheral receiving groove 25 in which a snap ring 26 is located. In this example, the snap ring 26 protrudes into the receiving groove 25 only to the extent that it is axially retained within the receiving groove 25 in an untensioned state. However, in this example, the cross section of the receiving groove 25 in the direction of radial expansion within the wall of the sleeve 11 is constructed large enough to completely accommodate the radially expanded snap ring 26 within the receiving groove 25, such that the snap ring 26 no longer protrudes radially from the receiving groove 25 into the inner opening of the sleeve 11.

[0050] The bead 24 is provided with a peripheral inclined starter 27 on the side of the bead 24 facing the threaded shaft 8. The peripheral inclined starter 27 extends axially obliquely relative to the axial center axis of the support bolt 6 and extends obliquely at a distance from the threaded shaft 8 from a point of small radial diameter to a point of large diameter as can be seen in Figures 5 and 6, i.e., to the beginning of the radially outer surface of the bead 24.

[0051] The axially opposite end of the bead 24 facing the unthreaded portion 13 is also provided with a tilt initiator 28. However, the tilt initiator 28 extends in the opposite direction to the tilt initiator 27 and also over a very small change in diameter of the shaft portion 23.

[0052] The snap ring 26, which is accommodated in an untensioned state within the accommodation groove 25 on the inner surface of the sleeve 11, protrudes into the internal space of the sleeve 11 by a length slightly smaller than the radial half of the snap ring 26 in an untensioned state, as shown in FIG. 6 . When the sleeve 11 is axially press-fit onto the shaft of the support bolt 6 from below the support bolt 6, the snap ring 26 first moves so as to abut against the tilt start member 27 during axial movement of the sleeve 11. As a result, as the relative axial movement between the sleeve 11 and the shaft portion 23 continues, the snap ring 26 expands radially outward and, while being displaced on the radial outer surface of the bead 24 in this example, is further pressed radially into the accommodation groove 25 and abuts against the shaft portion 23 via the sleeve 11.

[0053] If the sleeve 11 continues to move axially, as soon as the sleeve 11 is displaced axially to such an extent that the snap ring 26 reaches the other opposing inclined start surface 28, an elastic restoring force is generated by the expansion of the snap ring 26. As a result, the snap ring 26 again bends radially inward while sliding along the inclined start member 28.

[0054] In this example, the position of the receiving groove 25 of the sleeve 11 relative to the free end of the shaft portion is selected so that when the end face of the sleeve 11 abuts against the underside of the opposing enlarged unthreaded portion 13, the snap ring 26 again bends radially inward to such an extent that it reaches exactly the axial radially inner end of the tilt start member 28, as can be seen in Figure 7.

[0055] In this state, the sleeve 11 is fixed axially to the support bolt 6 by cooperation of the deflected snap ring 26 in the fixed position and the inclined start member 28 facing the snap ring 26. This holds the sleeve 11 on the support bolt 6.

[0056] Now, when it is desired to remove the sleeve 11 from the support bolt 6, it is only necessary to apply tension to the sleeve 11 in the axial direction away from the unthreaded portion 13. As a result, during the axial movement of the sleeve 11 and the support bolt 6, the snap ring 26 is again opened radially outward into the receiving groove 25 by the inclined starter member 28, and in this state is displaced on the outer circumferential surface of the bead 24, and again elastically bends radially along the inclined starter member 27 that follows at the other axial end of the bead 24. As a result, the sleeve 11 and the support bolt 6 are no longer in the locked position. The support bolt 6 and sleeve 11 can then be removed radially.

[0057] Both the axial press-fitting of the sleeve 11 onto the support bolt 6 and the axial removal of the mounted sleeve 11 from the bolt require in each case only an axial force acting on the sleeve 11. This force can cause radial rebound of the snap ring 26 via the inclined starter member 27 or the inclined starter member 28, i.e. a relatively small force that can normally be applied by hand.

[0058] 1 and 2, with the assembled coupling device 1, it is now possible to proceed with the assembly by removing the sleeve 11 axially from below the ring holder 4 with little force, as shown in FIG. 4, and then lifting the ring holder 4 together with the support bolt 6 and the locking element 18 upwards and removing this lifted structural unit from the interior space of the sling 2. A closed sling, such as a cable loop, can then be introduced into the intermediate space between the exposed end regions 3 of the sling 2. The ring holder 4 together with the support bolt 6 and the locking element 18 can then be placed again on the end region 3 of the sling 2 so that the end region 3 engages again in the open recess 5 of the ring holder 4. The sleeve 11 is then pushed axially upwards from below over the threaded portion 8 of the support bolt 6 until it reaches its locking position, shown in FIG. 7, where it is again held on the shaft of the support bolt.

[0059] This process of hanging or introducing the closed sling can be carried out in a very simple and quick manner and with little force, so that the hanging of the sling 2 can then be carried out via the closed sling of the holding device or lifting device.

[0060] In the assembled state, the through opening 15 in the ring holder 4 is constructed in such a way that in the axial region where the sleeve 11 in the assembled state projects axially into the through opening 15, a small radial clearance is provided between the circumferential surface of the axial part of the sleeve 11 projecting into the ring holder 4 and the inner surface of the through opening 15, in order to ensure easy, friction-free relative rotation between the sleeve 11 and the ring holder 4. In this connection, an axial annular clearance is also provided between the upper side of the radially projecting end flange 12 of the sleeve 11 and the axially lower end face of the ring holder 4, as can all be seen in the cross-sectional view of Figure 3.

[0061] Therefore, if rotation of the support bolt 6 is not prevented by the locking member 18, it is possible to rotate the support bolt 6 while the load 10 is connected to the threaded shaft 8 and to orient the support bolt 6 toward the load relative to the position of the sling 2 without the use of tools.

[0062] In all cases, the coupling device 1 according to the invention has a relatively simple construction, especially with regard to the advantages that it simultaneously derives.

Claims

1. A coupling device (1) for coupling a load to the sling (2) by means of the support bolt (6), comprising: a support bolt (6), a sling (2), a ring holder (4), a sleeve (11), at least one locking member (18), a ball bearing (9), and a snap ring (26), - the support bolt (6) is positioned in the through opening (15) of the ring holder (4) so ​​as to be rotatable about its longitudinal axis, the support bolt (6) having a threaded shaft (8) and a bolt head (7) that projects radially beyond the threaded shaft (8) and can be rotated together with the threaded shaft (8) relative to the lifting device (2); - the ring holder (4) can be rotated about the support bolt (6) and is covered on its underside by a radially projecting end flange (12) at the lower end of the sleeve (11) which is releasably fixed to the support bolt (6) by axial tension; the at least one locking member (18) is provided on the ring holder (4), is capable of being engaged with the bolt head (7) and is capable of being moved to a locking position and an initial position, the at least one locking member (18) preventing the bolt head (7) from rotating relative to the ring holder (4) in the locking position and not engaging with the bolt head (7) in the initial position; - the support bolt (6) is supported in the through opening (15) of the ring holder (4) by means of the ball bearing (9), and - said sling (2) is constructed as an open ring, two end regions (3) of the sling (2) are bent toward each other and extend, in an assembled state, on radially opposite sides into a recess (5) formed on the underside of the ring holder (4) and opening downwards in the ring holder (4); In the assembled state, the sleeve (11) is connected to the support bolt (6) by the snap ring (26), The sleeve (11) has an inner surface provided with an annular groove (25) for receiving the snap ring (26), and the snap ring (26) protrudes into the inner space of the sleeve (11) in a tension-free state; The support bolt (6) includes a radially protruding annular bead (24) in the region between the bolt head (7) and the threaded shaft (8); The annular bead (24) has two axial ends with inclined start portions (27, 28), As a result, when the sleeve (11) is pressed into or removed from the sleeve (11) in the axial direction, the snap ring (26) is pressed into the annular groove (25) of the sleeve (11) via one of the inclined starting portions, and then passes over the other inclined starting portion of the annular bead (24) at the other inclined starting portion, and then elastically springs back again in the radial direction.

2. 2. A coupling device according to claim 1, characterized in that said at least one locking member (18) is constructed as a tilting lever.

3. 3. A coupling device according to claim 1 or 2, characterized in that the bolt head (7) forms a hexagonal shape when viewed from above.

4. 2. A coupling device according to claim 1, characterized in that the support bolt (6) is supported on the ring holder (4) by means of the ball bearing (9) in the region of the support bolt (6) between the bolt head (7) and the beginning of the threaded shaft (8) of the support bolt (6).

5. 5. A coupling device according to claim 4, characterized in that the support bolt (6) is provided with a guide groove (16) serving to accommodate the balls of the ball bearing (9).

Images