Deflection device of a cable with a cable securing element and lifting device with the same

Abstract

The invention relates to a rope deflection device comprising a roller bracket for supporting at least one rope deflection pulley, at least one rope deflection pulley rotatably mounted on the roller bracket about a pulley rotation axis, and a rope securing arrangement for ensuring correct reeving of a rope at the rope deflection pulley, characterized in that the rope securing arrangement is pivotable relative to the roller bracket about a pivot axis in order to switch between a securing position in which a rope deflected by the rope deflection pulley is secured in the rope deflection pulley, and a release position in which a rope deflected by the rope deflection pulley is not secured in the rope deflection pulley, wherein the pivot axis runs parallel to the pulley rotation axis.

Description

[0001] The present invention relates to a deflection device for deflecting a rope according to the preamble of claim 1, as well as a system and a lifting device comprising such a device.

[0002] Many lifting devices and machines have ropes that are redirected over at least one pulley on the machine, for example, a hoist rope that is repeatedly sheaved between pulleys of a boom head and a hook block. The pulleys are often secured by safety devices that prevent the rope from jumping out of them. One example of such safety devices are so-called rope guards, which are frequently used on mobile cranes. These rope guards are positioned at a small radial distance from the pulleys so that they do not touch the pulleys or the rope, but prevent the rope from jumping out of the pulleys.

[0003] When reeving the rope, it frequently happens with such devices that the rope is not threaded between the rope guard bar and the pulleys, but is incorrectly guided over the outside of the rope guard bar. This can result in significant material damage to the rope.

[0004] The present invention therefore aims to reduce or even completely prevent the risk of such incorrect re-entry in deflection devices of the generic type. Furthermore, it should be noted here that whenever the singular "the deflection pulley" is used below, it always refers to at least one deflection pulley.

[0005] According to the invention, this problem is solved by a deflection device with the features of claim 1 and by a system according to claim 13 or a lifting device with the features of claim 14. Advantageous embodiments of the invention are described in the dependent claims and the following description.

[0006] According to the invention, a deflection device for deflecting a rope, such as a crane lifting rope, is proposed. This device comprises a roller bracket for supporting at least one rope deflection pulley, at least one rope deflection pulley rotatably mounted on the roller bracket about a pulley rotation axis, and a rope securing arrangement for ensuring correct reeving of the rope at the rope deflection pulley. The device is characterized in that the rope securing arrangement is pivotable relative to the roller bracket about a pivot axis to switch between a securing position, in which a rope deflected by the rope deflection pulley is secured in the rope deflection pulley, and a release position, in which a rope deflected by the rope deflection pulley is not secured in the rope deflection pulley, the pivot axis being parallel to the pulley rotation axis.

[0007] The deflection device according to the invention makes it possible to switch the rope safety arrangement between the release position and the locking position relatively quickly and intuitively. This is achieved simply by moving the device between the positions using a pivoting movement that roughly follows the outer circumference of the deflection pulley, whereby typically the radial distance of the safety arrangement relative to the deflection pulley increases when moving from the locking position to the release position.

[0008] Furthermore, the parallelism of the pivot axis to the roller rotation axis ensures precise and stable positioning of the rope securing arrangement, leading to increased operational safety and the longevity of the rope deflection pulleys.

[0009] According to an optional modification of the present invention, the rope securing arrangement may include at least one rope guard bar which, in the securing position of the rope securing arrangement, is designed to restrict movement of the rope guided by the rope deflection pulley in a radial direction away from the rope deflection pulley, preferably wherein the at least one rope guard bar is aligned in its longitudinal axis parallel to the pulley rotation axis and / or is rotatably mounted about its longitudinal axis.

[0010] The purpose of the rope guard bar is to secure a rope correctly engaged in the pulley, thus preventing it from unintentionally jumping out when unloaded. This is typically achieved by positioning the rope guard bar close to the outer circumference of the pulley, such that the distance between the rope guard bar and a radially outer area of ​​the pulley is less than the diameter of the rope being deflected by the pulley.

[0011] Since the rope guard bar is oriented parallel to the axis of rotation of at least one pulley, the pivoting motion used to move from the secured position to the released position creates a particularly simple and robust rope securing arrangement. Because the rope guard bar serves to hold a rope guided by a pulley in position within its respective pulley if it attempts to jump out, it is helpful to reduce friction between the rope guard bar and the rope if the guard bar itself is rotatable about its longitudinal axis. If contact occurs between the rope being secured and the rope guard bar, the resulting friction causes the guard bar to rotate, thus preventing the excessive friction that would occur if the guard bar were not rotatable.

[0012] Advantageously, according to a further development of the present invention, it can be provided that the at least one rope guard bar in a release position has a larger radial distance to the at least one rope deflection pulley than in the securing position, in order to enable correct reeving of a rope onto the at least one rope deflection pulley in which the rope to be reeved is arranged between the at least one rope deflection pulley and the at least one rope guard bar.

[0013] In the release position, the rope guard bar is positioned radially further away from the outer surface of the rope pulley to allow the rope to reeve into the pulley. In the locking position, where the radial distance to the outer surface of the rope pulley is smaller, the rope end of the rope being redirected by the pulley cannot be correctly reeved due to its typically larger diameter compared to the rope diameter. The rope end is usually fitted with a ferrule, which serves to hold the individual fibers or strands of the rope together. This ferrule is larger in diameter than the rope diameter, so correct reeving into the rope pulley is not possible in the locking position of a rope locking system.

[0014] Preferably, it is provided that the at least one rope guard rod in the release position, when a deflection device is aligned as intended, is radially further away from the at least one rope deflection pulley than a reeving curve of a rope to be reeved, in particular a steel rope, which is dimensioned to match the at least one rope deflection pulley.

[0015] The reeving curve describes a term known to those skilled in the art and denotes the specific path or track along which a rope, such as a lifting rope of a crane, runs along the rope deflection pulleys during the reeving process.

[0016] Preferably, it can be provided that the reeving curve to one side is determined by a horizontal feed from the other side to an upper point of a rope deflection pulley, and the rope beginning guided over the upper point of the rope deflection pulley is observed while further rope length is fed in.

[0017] According to a further optional modification of the present invention, it can be provided that the pivot axis is arranged radially offset from the roller rotation axis to the at least one cable deflection pulley.

[0018] By radially offsetting the pivot axis relative to the roller rotation axis, the desired effect is achieved when pivoting the rope securing arrangement, for example, whereby the radial distance in the secured position of the rope securing arrangement is less than in the release position compared to the outer circumference of the at least one rope deflection pulley.

[0019] Furthermore, according to the present invention, the rope securing arrangement may have two leg elements which are rotatably attached to opposite side parts of a receiving space of the roller bracket for receiving the at least one rope deflection pulley, in particular such that the rotatable attachment of the two leg elements embodies the pivot axis of the rope securing arrangement, preferably wherein two leg elements are identical to each other.

[0020] Accordingly, the rope safety device can be designed to have two leg elements, each rotatably attached to a side part of the pulley bracket. Typically, the rotatable attachment of each leg element is located on the pivot axis, so that pivoting the two leg elements allows the rope safety device to switch between the release position and the secured position.

[0021] Each of the two leg elements is arranged on a side panel of a receiving chamber of the pulley holder. This side panel is offset relative to the at least one cable pulley held in the receiving chamber in the direction of the pulley's axis of rotation and typically serves to support the at least one cable pulley held in the receiving chamber. A first leg element is attached to a first side panel, while a second leg element is attached to the side panel opposite the first, which is offset relative to the pulley's axis of rotation. The two inner surfaces of the pulley holder's side panels thus face the different flat sides of the at least one cable pulley.It is clear to those skilled in the art that the arrangement of the two leg elements does not necessarily have to take place on an inner side of the two side parts, but that other surfaces of the side parts are also available for this purpose. For example, it is provided that the two leg elements are rotatably attached to an element projecting forward from the side part, whereby the projecting element lies in a plane that is parallel to a plane defined by the cable pulley.

[0022] The receiving space is typically adapted to the exact number of single or multiple rope deflection pulleys, so that the width of the receiving space essentially corresponds to the width of the multiple rope deflection pulleys arranged side by side. However, it is understood by those skilled in the art that not all rope pulleys need to be in use, i.e., reeved.

[0023] According to a further advantageous embodiment of the present invention, it can be provided that the at least one rope guard rod is mounted at its respective longitudinal end regions on the two leg elements, in particular rotatably mounted, and is aligned parallel to the roller axis of rotation.

[0024] Accordingly, the rope guard bar is supported on the leg elements spaced apart from each other along the roller's axis of rotation, such that one longitudinal end or a longitudinal end section of the rope guard bar is supported on a first leg element and the other longitudinal end or the other longitudinal end section on a second leg element. For this support, an opening is provided in each of the two leg elements, allowing the rope guard bar to be rotatably received in the respective opening. The rope guard bar can be secured, preventing it from leaving the desired position in the respective opening of a leg element, by inserting a locking pin that crosses the diameter of the rope guard bar, thus preventing or severely restricting movement of the rope guard bar towards the roller's axis of rotation.It may also be provided that the rope guard rod supported by the two leg elements has an opening in each of its two longitudinal end regions for inserting a locking pin, so that the rope guard rod is fixed in the direction of the roller axis of rotation by providing the two locking pins.

[0025] Furthermore, it may be provided that a blocking element runs in the direction of the roller rotation axis between the two leg elements, which serves to make it more difficult to guide a rope deflected by the deflection pulley on a side facing away from the rope securing arrangement to the at least one deflection pulley, in particular in such a way that an opening area between the blocking element and a rope guard bar does not allow the passage of a rope whose dimensions are matched to the at least one rope deflection pulley or its rope potting sleeve located at the rope start.

[0026] The blocking element can be designed in a plate-like or tubular form and runs from one leg element to the other leg element.

[0027] By providing the locking element, it is no longer so easy to overlook an incorrectly reeved rope, since the incorrectly reeved rope now spans not only the rope guard bar on the side facing away from the pulley, but also the locking element, and is therefore much more visible. Ultimately, the incorrectly reeved rope then spans not only the rope guard bar, but also the locking element on its side facing away from the pulley. According to the present invention, such incorrect reeving is significantly less likely, since unintentional incorrect reeving is virtually impossible. However, if, intentionally or for other reasons, the rope to be reeved were tensioned on the side of the rope guard bar facing away from the pulley, even with a deflection device according to the present invention, such a condition would be much easier to detect visually.

[0028] According to a further advantageous embodiment of the present invention, it can be provided that a handle element, in particular a rod-like handle element, runs parallel to the roller rotation axis between the two leg elements, which enables simple hand-operated pivoting of the rope safety arrangement between the release position and the safety position.

[0029] To move the rope belaying device from the secured position to the released position and vice versa, it is helpful to provide a handle so that the change between the two positions can be carried out easily by hand. To apply a force to the rope belaying device that roughly corresponds to the pivoting motion required to change positions, it is advantageous if a handle runs between the two leg elements, allowing a force to be applied to both leg elements simultaneously using the handle.

[0030] According to a further optional embodiment of the present invention, the deflection device may further comprise at least one locking device for locking the rope safety arrangement in the locking position and / or the release position on the roller holder.

[0031] Such a locking device serves to lock the rope safety assembly in the release position and / or the locking position. This is particularly advantageous because an unnoticed departure of the rope safety assembly from the release position and / or the locking position is undesirable. Ultimately, it could happen that if the rope safety assembly were to leave its locking position, a rope guided by the pulley could no longer be prevented from jumping out. Furthermore, an unnoticed departure of the rope safety assembly from the release position would also be undesirable, as this would significantly disrupt the normal sequence of a reeving or reeving operation.Under certain circumstances, it would no longer be guaranteed that the rope guard bar is actually located outside of a reeving curve, so that an unwanted collision of the rope being reeved with the rope safety device or, in the worst case, an unintentional overtensioning of the rope safety device may occur, so that the rope being reeved is tensioned over the side of the rope guard bar facing away from the rope deflection pulley.

[0032] For the aforementioned reasons, it is therefore advantageous if a reliable positioning in the release position and / or the securing position can be achieved by the rope securing arrangement.

[0033] According to a further advantageous embodiment of the present invention, the at least one locking device may comprise a detent opening and an associated detent lug, wherein one component of the locking device is arranged on the rope securing arrangement and the other component on the roller bracket, preferably wherein the at least one locking device comprises a pre-tensioned detent pin as a detent lug, an associated detent hole as a detent opening, and further a deflection element, such that when the rope securing arrangement is moved into the locking position and / or the release position, the deflection element deflects the detent pin against its pre-tensioned position, and after reaching the locking position and / or the release position, the pre-tensioned detent pin engages in the detent opening which is then aligned with the detent pin.

[0034] For example, a deflecting element could be an element bent towards a central area of ​​the receiving space, which, when the pivoting movement is performed to transfer to the release position and / or the locking position, displaces a locking element pre-tensioned by means of a clamping element against the pre-tensioning direction, so that after finally reaching the desired position, a locking into an opening, a step-like bend or the like is made possible.

[0035] Releasing the device from this position is only possible by moving the locking element, which is pre-tensioned by the tensioning element, against its spring force, so that the locking element is no longer in a locking engagement with the locking partner and the rope locking arrangement can be moved again along the pivoting movement.

[0036] According to a further optional modification of the present invention, it can be provided that the locking device in the locking position comprises the rope guard bar and receiving openings for the rope guard bar arranged on opposite side parts of a receiving space of the roller bracket, so that leaving the locking position is only possible after the rope guard bar has been released from the receiving openings.

[0037] According to this embodiment, the rope guard bar is part of the locking device, so that moving the rope safety assembly from the release position and / or the locking position is only possible by removing the rope guard bar from corresponding openings that are fixedly connected to the side parts of the roller bracket. Furthermore, it can be provided that each of the two leg elements, as well as the openings extending from or formed in the two side parts, are aligned with each other in the release position and / or the locking position, so that locking of the rope safety assembly is achieved by inserting the rope guard bar into the aligned openings of the leg elements and the openings extending from or formed in the side parts.

[0038] According to a further optional modification of the present invention, it can be provided that at least two rope protection bars are provided which act on different radial areas of the at least one rope deflection pulley and the respective effective areas of the two rope protection bars enclose an angle to each other in the circumferential direction of the rope deflection pulley which exceeds 60°, preferably 75° and preferably 90°.

[0039] To ensure that a rope deflected by a pulley remains in its intended guide over a larger circumference of the pulley, it is advantageous to provide several rope guard bars spaced apart from each other around the pulley. This ensures that the rope remains in the pulley's guide at two points spaced apart around the pulley's circumference. This guarantees that the rope is guided in the pulley's intended path over a larger circumference.

[0040] In a further optional modification, it can be provided that each of the two rope protection bars runs between the two leg elements and / or that the two rope protection bars are oriented parallel to each other.

[0041] The invention further relates to a system comprising a deflection device according to one of the aspects discussed above and a rope, wherein the rope is dimensioned, in particular its diameter, to match the at least one rope deflection pulley and is deflected by it, wherein the rope is preferably a steel rope.

[0042] Furthermore, the present invention relates to a working machine or a lifting device, such as a crane or a mobile crane, with a deflection device according to one of the aspects discussed above or a system according to the preceding paragraph.

[0043] Advantageously, the deflection device can be arranged on a boom head of a boom, in particular a telescopic boom, and preferably serves to form a rope connection to a hook block held by the boom.

[0044] Further features, details and advantages of the invention will become apparent from the exemplary embodiments explained below with reference to the figures. The figures show: Fig. 1: a side view of an embodiment of the working machine or lifting device according to the invention; Fig. 2: a front view of a boom head according to the prior art; Fig. 3: a side view of a deflection device according to the prior art together with a hook block attached to the deflection device; Fig. 4.1: a perspective view of a rope safety arrangement according to the invention according to a first embodiment; Fig. 4.2: a side view of the deflection device according to the invention according to the first embodiment with the rope safety arrangement in the release position; Fig. 4.3: a side view of the deflection device according to the invention according to the first embodiment with the rope safety arrangement in the secured position; Fig. 4.4: a perspective view of the deflection device according to the first embodiment with the rope safety arrangement in the secured position; Fig. 5.Fig. 1: A perspective view of a rope safety arrangement according to a second embodiment according to the invention, Fig. 5.2: A perspective view of a deflection device with the rope safety arrangement of the second embodiment in the release position, Fig. 5.3: A perspective view of a deflection device with the rope safety arrangement of the second embodiment in the locking position, Fig. 6.1: A perspective view of a rope safety arrangement according to a third embodiment according to the invention, Fig. 6.2: A perspective view of a deflection device with the rope safety arrangement of the third embodiment in the release position, Fig. 6.3: A side sectional view of the deflection device with a rope safety arrangement of the third embodiment in the release position, in which the retraction curve of a rope is additionally included, and Fig. 6.4: A perspective view of a deflection device with the rope safety arrangement of the third embodiment in the locking position.

[0045] In the Figure 1 Figure 1 shows a side view of an embodiment of the lifting device or working machine 1 according to the invention. The working machine 1 of the illustrated embodiment is a mobile crane with a movable undercarriage 2, a superstructure 3 rotatably mounted on the undercarriage 2, and a telescopic boom 4 arranged on the superstructure 3, which has a boom head 11 at the end of its innermost telescopic section. A hoisting cable 5 is guided by a hoist winch over several pulleys on the boom head 11 and is sheared between the pulleys 9 and a hook block 6. The boom head 11 can have at least one deflection device 100 according to the invention for deflecting the hoisting cable 5. However, the present invention is not limited to this embodiment.

[0046] The Figure 2Figure 1 shows an embodiment of a boom head 11, which has an upper pulley assembly consisting of rope deflection pulleys 10 and a lower pulley assembly consisting of rope deflection pulleys 9. According to the invention, each pulley assembly can be formed by a respective deflection device 100 according to the invention, in order to prevent the rope 5 from jumping out of each pulley assembly and to reliably prevent or more easily detect faulty reeving. However, the invention also includes the possibility that only one of the two pulley assemblies is formed by the deflection device 100 according to the invention.

[0047] In the case of several deflection pulleys 9 arranged side by side, as for example in Figure 2 As shown, the rope securing arrangement 14 extends in particular over all of the adjacent deflection pulleys 9.

[0048] Figure 3Figure 1 shows a side view of a state-of-the-art deflection device, in which the telescopic boom 4 and the pulley head 8 located at its front end can be seen. The upper cable deflection pulleys 10, which form the upper pulley assembly, deflect the lifting cable 5 downwards towards the hook block 6. There, another cable deflection pulley (not shown) is used to redirect the cable. Figure 3 (as can be seen) a deflection back to the pulley head 8, so that the rope 5 can be engaged there with a rope guide pulley 9 of the lower pulley assembly before being led back to the hook block 6. Depending on the number of rope guide pulleys 9, several loops are formed between the pulley head 8 and the hook block 6.

[0049] In Figure 3It can be seen that the rope guard 7 was incorrectly not removed during the reeving process, resulting in the rope 5, deflected by the rope guide pulley 9, running along the side of the rope guard 7 facing away from the rope guide pulley 9. The correct routing for the rope 5 would have been in the area between the rope guide pulley 9 and the rope guard 7, as this is the only way to prevent the rope 5 from jumping out of its guide on the rope guide pulley 9 under certain conditions. Furthermore, a second rope guard 13 is also visible, located in the upper area of ​​the rope guide pulley 9.

[0050] Figure 4.1Figure 1 is a perspective view of a rope safety device 14 according to the invention, which is pivotably mounted on a pulley head 8. This device has a first leg element 21 and a second leg element 23, each with an opening for connecting it to the pulley head 8. The two leg elements 21 and 23 are spaced apart from each other along the pulley's axis of rotation and connected to each other by a rope guard 7 running parallel to the pulley's axis of rotation. To ensure easy operation of the rope safety device 14, a handle element 12 running along the pulley's axis of rotation can also be provided, which connects the two leg elements 21 and 23.

[0051] Furthermore, the optionally provided locking element 32 is also shown, which likewise extends between the two leg elements 21, 23 and whose significance will be explained in more detail later in the figure description. It is evident, however, that a stop element 20, 33 projects from the locking element 32 in the direction of the roller's axis of rotation, serving to correctly position the rope safety assembly 14 in the secured position. The stops 34, 35 then come into contact with a component of the roller head 8 when the rope safety assembly 14 has reached the release position.

[0052] The dashed line 25 symbolizes the course of a position of a pre-tensionable locking element arranged on the roller head 8, as this is pushed back or tensioned by a curved section 231 on the leg element when the rope safety arrangement 14 is moved into the locking position, so that after reaching the locking position it snaps into the opening 24 due to the spring pre-tension generated by the curved section 231.

[0053] Similarly, the dashed line 22 symbolizes the course of a position of a pre-tensionable locking element arranged on the roller head 8, as this element presses against the first leg element 21 with a certain force generated by the pre-tension when the rope safety arrangement 14 is moved into the release position, so that after reaching the release position, it snaps into the opening 28 due to the pre-tension and fixes the rope safety arrangement 14 in the release position.

[0054] As can be seen in conjunction with the following figures, the deflection device 100 is designed such that the safety device 14 can be moved into the open position, the release position, by a rotational movement about the pivot axis 15. For example, a locking bolt 17 runs along the leg element 21 and the curve 22 of the cable safety device 14 until it engages in the opening 28. This locking can be achieved automatically by the spring return of the locking bolt 17, thus securing the cable safety device 14 in the open position without any additional assembly effort.

[0055] Figure 4.2Figure 1 shows a side view of the deflection device 100 with a rope safety device 14 in the open position, the release position. In this position, the rope safety device 14 is rotated about the pivot axis 15, which runs parallel to the pulley rotation axis, allowing the lifting rope 5 to be safely reeved. During the reeving process, the lifting rope 5 runs along the reeving curve 16 (shown with dashed lines) and is guided over the rope pulleys 9 to the hook block 6. It can be seen that, due to the pivoting into the release position, the rope guard 7 of the rope safety device 14 is no longer located in an area between the reeving curve 16 and the outer circumference of the rope deflection pulley 9, so that during a reeving process there is no longer a risk of the rope being reeved being guided along the side of the rope guard 7 facing away from the rope deflection pulley 9.

[0056] The reeving curve refers to the position of a rope end during a reeving process. Preferably, the reeving curve for one side of the rope pulley can be determined by guiding the rope essentially horizontally to an upper point of a rope deflection pulley, and the rope end, guided over the upper point of the rope deflection pulley, is locked in place by further supplying rope length.

[0057] It should be noted that for smooth reeving, the second rope guard bar 13, which is located in the upper area of ​​the rope deflection pulley 9, must also be removed.

[0058] To lock the rope safety device 14 in its locked position, a receiving element 40 projecting forward from the roller head 8 is provided. At its end furthest from the roller head 8, the receiving element 40 has a spring-loaded locking pin 18, which can engage with a corresponding locking opening 24 on one of the two leg elements of the safety device 14 to form a locking connection when the safety device 14 is moved into the locked position. A similarly functioning locking device is also provided for holding the safety device 14 in the release position.

[0059] Figure 4.3Figure 1 shows a side view of the deflection device 100 with the rope safety device 14 in the closed position, the locking position. In this position, the rope safety device 14 is aligned such that the lifting rope 5 is secured against jumping out of at least one rope deflection pulley 9. The rope safety device 14 is locked by the locking bolt 18, which, in the closed position, is guided along the curved section 231 onto the leg element 23 and the curve 25 until it engages in the opening 24. This locking ensures that the lifting rope 5 is pressed sufficiently close to the rope pulleys 9, thus guaranteeing stable and secure guidance of the rope 5.

[0060] The design of the rope locking arrangement 14 in combination with the locking bolts 18, 19 also ensures that the lifting rope 5 no longer has to be pressed against the rope grooves of the rope pulleys 9 by direct hand contact in order to enable the installation of the rope protection bar, but this is done automatically by contact with the rope locking arrangement 14 when moving into the locking position.

[0061] Figure 4.4 Figure 1 shows a perspective view of the lower part of the roller head 8 with a rope safety device 14 in the closed position. The locking pin 17, which ensures that the rope safety device 14 is locked in the release position, can also be seen here by aligning with the opening 26 (shown, for example, in Figure 2). Fig. 4.1 ) works together.

[0062] Furthermore, it can be seen that for the secure fastening of the locking arrangement 14 in the locked position, an opening is provided on each of the two legs 21, 23, which interacts with a locking device attached to the roller head 8 via a receiving element 40. On the in Fig. 4.4 On the left side, the locking pin 19 can be seen on the receiving element 41, and on the right side, the locking pin 18 can be seen on a receiving element 40, both of which are attached to the roller head 8.

[0063] Figure 5.1Figure 1 shows a second embodiment of the present invention, in which the basic principle of pivoting the rope safety device is retained, but the locking mechanism relative to the roller head in the secured position is implemented differently. The rope safety device 14 is locked by means of the rope guard 7 and openings in the distal region of the respective leg elements, through which the rope guard 7 can be inserted. To ensure that the rope guard 7 remains securely in place, it can have hinged plugs 28, 29 at its respective longitudinal end regions, which, after being inserted through the openings of the rope safety device 14, provide a secure hold.

[0064] Figure 5.2Figure 1 illustrates the deflection device 100 according to the second embodiment, in which the safety device 14 is in its open position. As already explained, the rope guard bar 7 is used for locking in the safety position. In the open position, the release position, the rope guard bar 7 is removed, allowing the rope safety device 14 to be moved into the release position in order to retract the lifting rope 5 along the defined retraction curve 16.

[0065] The rope safety device 14 is moved into the open position by rotating it about the pivot axis 15. First, the snap-fit ​​connectors 28 and 29 must be removed so that the rope guard bar 7 can be pulled laterally out of the openings in the receiving elements 30, 31 located to the left and right of the roller assembly on the roller head 8. After removing the rope guard bar 7, the rope safety device 14 can be moved upwards about the pivot axis 15 into the open position without the extended rope guard bar 7. The locking bolt 17, already described with reference to the preceding embodiment, then automatically locks the rope safety device 14 in the release position.

[0066] In this way, there is now sufficient space in the radial direction of the rope deflection pulley 9 to accommodate the rope beginning, especially the part in the Figure 5.2 To enable the illustrated lock casting sleeve 36 to be guided downwards for correct retraction.

[0067] Figure 5.3Figure 1 shows a perspective view of the deflection device 14 in the second embodiment in the secured position. Compared to the previously discussed Figure 5.2 It can be seen that it is not possible to guide a rope end through the locking sleeve 36, which is typically located at the rope end, because the blocking element 32 prevents it from being guided directly along the outside of the rope guard bar 7. The space shown between the rope guard bar 7 and the blocking element 32 is dimensioned such that the locking sleeve 36 cannot pass through it.

[0068] The deflection device according to the second embodiment with the illustrated rope securing arrangement 14 also enables easier retrofitting to the existing roller head 8, since it uses the existing mounts 30 and 31 and is compatible with the same pre-assembled parts such as the rope guard rod 7 and the folding plugs 28 and 29 that are used in prior art implementations.

[0069] Figure 6.1 Figure 1 shows a perspective view of a third embodiment of the deflection device 100, wherein the rope securing arrangement 14 includes not only the rope guard bar 7, but also the second rope guard bar 13, which is typically to be placed near the upper point of a rope deflection pulley 9 received in the pulley head 8.

[0070] Similar to the first rope guard bar 7, the second rope guard bar 13 also runs from one leg element to the other leg element parallel to the roller rotation axis or the pivot axis 15. The advantage of this is that with only one movement, namely pivoting the rope securing arrangement 14 of the deflection device 100 according to the third embodiment, both the first rope guard bar 7 and the second rope guard bar 13 can be moved into a position, so that during a reeving operation the probability of an incorrect reeving can be completely eliminated or at least greatly reduced.

[0071] Furthermore, it can be seen that the opening 25 is now used not only for locking in one of the two positions, the release position and the locking position, but for both. In order to allow the locking pin to be pre-tensioned for each of the two movements to move into the release position or the locking position, the leg element has a correspondingly shaped curved section that can push back both the locking pin in the release position and the locking pin in the locking position, so that when the locking pin aligns with the opening 26, the locking pin snaps into place and the rope safety device 14 is locked in the corresponding position.

[0072] To maintain sufficient stability of the rope safety arrangement 14 even when both rope guard bars 7, 13 are removed, e.g., for replacement during maintenance, a further stabilizing element 27 can be provided in addition to the handle-like holder 12. This stabilizing element preferably connects the two leg elements 21, 23 in the area of ​​the second rope guard bar 13. The stabilizing element 27 also performs a locking function.

[0073] Figure 6.2Figure 1 shows the deflection device 100 with its rope safety assembly 14 in the release position. To reach the open position, the rope safety assembly 14 is moved upwards by a rotational movement about the pivot axis 15, whereby the rope guard bars 7 and 13 are simultaneously moved into the open position. This facilitates the reeving process, as neither of the two rope guard bars 7, 13 now needs to be removed from the roller head 8. The roller rotation axis is also symbolized by a dashed line parallel to the pivot axis 15.

[0074] Figure 6.3Figure 1 is a sectional view from the side, showing the rope locking device 14 in its release position. It can be seen that neither the first rope guard 7 nor the second rope guard 13 collides with the retraction curve 16, but rather the retraction curve 16 runs between the respective rope guards 7 and 13 and the radial outer circumference of the rope deflection pulley 9. This means that during a normal retraction operation, the respective rope guards 7 and 13 do not collide with the rope being retracted or with the locking sleeve located at the beginning of the rope being retracted, thus allowing a normal retraction operation to be carried out. The advantage of this is that the rope locking device 14, with a single pivoting movement, ensures that both rope guards 7 and 13 are moved from their locking position to their respective release positions.It is therefore no longer necessary to carry out separate work processes to dismantle the two rope protection bars 7, 13 in order to be able to carry out a reeving operation.

[0075] A major advantage for the reeving process is the elimination of removable, loose parts, thus preventing forgotten parts from falling from great lifting heights. This hazard is also eliminated by this design.

[0076] Figure 6.4Figure 100 represents the deflection device in its closed position. In this position, the rope safety device 14 is aligned such that the lifting rope 5 runs securely in the pulleys 9 and is secured against jumping out (with no contact between the rod and the pulleys). The rope safety device 14 is automatically locked after reaching the release position and / or the locking position, as at least one locking pin engages in an opening of a leg element when the corresponding position is reached. Reference symbol list:

[0077] 1 Working machine 2 Undercarriage 3 Superstructure 4 Telescopic boom 5 Lifting rope 6 Hook block 7 Rope guard bar 8 Sheave head 9 Rope deflection pulley (lower sheave pack) 10 Rope deflection pulley (upper sheave pack) 11 Boom head 12 Handle element 13 Second rope guard bar 14 Rope securing assembly 15 Swivel axis 16 Reeving cam 17 Detent pin 18 Detent bolt 19 Detent bolt 20 Stop element 21 First leg element 22 Curve 23 Second leg element 24 Opening 25 Opening 26 Opening 27 Stabilizing element 28 Folding plug 29 Folding plug 30 Mounting element 31 Mounting element 32 Locking element 33 Stop element 34 Stops 35 Stops 36 Lock potting sleeve 40 Mounting element 41 Receiving element 100 Deflection device 231 Curved section

Claims

1. A rope deflection device comprising: a pulley bracket for supporting at least one rope deflection pulley, at least one rope deflection pulley rotatably mounted on the pulley bracket about a pulley pivot axis, and a rope securing arrangement for ensuring correct reeving of a rope at the rope deflection pulley. characterized by the fact that The rope securing arrangement is pivotable about a pivot axis relative to the pulley support in order to switch between a securing position in which a rope deflected by the rope deflection pulley is secured in the rope deflection pulley and a release position in which a rope deflected by the rope deflection pulley is not secured in the rope deflection pulley, the pivot axis being parallel to the pulley rotation axis.

2. Deflection device according to the preceding claim 1, wherein the rope securing arrangement has at least one rope guard rod which, in the securing position of the rope securing arrangement, is designed to restrict movement of the rope guided by the rope deflection pulley in a radial direction away from the rope deflection pulley, preferably wherein the at least one rope guard rod is aligned in its longitudinal axis parallel to the pulley rotation axis and / or is rotatably mounted about its longitudinal axis.

3. Deflection device according to the preceding claim 2, wherein the at least one rope guard bar in a release position has a greater radial distance to the at least one rope deflection pulley than in the securing position, in order to enable correct reeving of a rope onto the at least one rope deflection pulley, in which the rope to be reeved is arranged between the at least one rope deflection pulley and the at least one rope guard bar, preferably wherein the at least one rope guard bar in the release position, with a deflection device oriented as intended, is radially further away from the at least one rope deflection pulley than a reeving curve of a rope to be reeved, in particular a steel rope, the dimensions of which are matched to the at least one rope deflection pulley.

4. Deflection device according to one of the preceding claims, wherein the pivot axis is arranged radially offset from the roller rotation axis to the at least one cable deflection pulley.

5. Deflection device according to one of the preceding claims, wherein the rope securing arrangement has two leg elements which are rotatably attached to opposite side parts of a receiving space of the roller bracket for receiving the at least one rope deflection pulley, in particular such that the rotatable attachment of the two leg elements embodies the pivot axis of the rope securing arrangement, preferably wherein two leg elements are identical to each other.

6. Deflection device according to the preceding claim 5, wherein the at least one rope guard rod is mounted at its respective longitudinal end regions on the two leg elements, in particular rotatably mounted, and is aligned parallel to the roller axis of rotation.

7. Deflection device according to one of the preceding claims 5 or 6, wherein a blocking element extends between the two leg elements in the direction of the roller rotation axis, which serves to make it more difficult to guide a rope deflected by the deflection pulley on a side facing away from the rope securing arrangement to the at least one deflection pulley, in particular such that an opening area between the blocking element and a rope guard bar does not allow the passage of a rope whose dimensions are matched to the at least one rope deflection pulley or of its rope potting sleeve located at the rope start.

8. Deflection device according to one of the preceding claims 5 to 7, further comprising a handle element, preferably wherein the handle element, in particular a rod-like handle element, runs parallel to the roller rotation axis between the two leg elements, enabling simple hand-operated pivoting of the rope safety arrangement between the release position and the safety position.

9. Deflection device according to one of the preceding claims, further comprising at least one locking device for locking the rope safety arrangement in the locking position and / or the release position on the roller holder.

10. Deflection device according to the preceding claim 9, wherein the at least one locking device comprises a detent opening and an associated detent lug, wherein one component of the locking device is arranged on the rope securing arrangement and the other component on the roller bracket, preferably wherein the at least one locking device comprises a pre-tensioned detent pin as a detent lug, an associated detent hole as a detent opening and further a deflection element, such that when the rope securing arrangement is moved into the locking position and / or the release position, the deflection element deflects the detent pin against its pre-tensioned position and, after reaching the locking position and / or the release position, the pre-tensioned detent pin engages in the detent opening which is then aligned with the detent pin.

11. Deflection device according to the preceding claim 9, further developed with the features of claim 2, wherein the locking device in the locking position comprises the rope guard bar and receiving openings for the rope guard bar arranged on opposite side parts of a receiving space of the roller bracket, so that leaving the locking position is only possible after the rope guard bar has been released from the receiving openings.

12. Deflection device according to one of the preceding claims, wherein at least two rope guard rods are provided which act on different radial areas of the at least one rope deflection pulley and the respective effective areas of the two rope guard rods enclose an angle to each other in the circumferential direction of the rope deflection pulley which exceeds 60°, preferably 75° and preferably 90°.

13. System comprising a deflection device according to one of the preceding claims and a rope, wherein the rope is dimensioned, in particular its diameter, to match the at least one rope deflection pulley and is deflected by it, wherein the rope is preferably a steel rope.

14. Lifting device, such as a crane or mobile crane with a deflection device according to any of the preceding claims 1 to 12 or a system according to claim 13.

15. Lifting device according to the preceding claim 14, wherein the deflection device is arranged on a boom head of a boom, in particular a telescopic boom, and preferably serves to form a rope connection to a hook block held by the boom.

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