Chain suspension for suspending a load on a crane hook

Abstract

The invention relates to a chain sling (10) for suspending a load from a crane hook, comprising a load-bearing eye (10.1) for attaching the chain sling to the crane hook and at least one crossbeam (10.2) connected to the load-bearing eye, at each end of which at least one lifting chain (10.5, 10.6) for attaching the load to be lifted is attached or can be attached. According to the invention, the crossbeam includes at least one fastening means (10.4) for at least one lifting chain, which is arranged vertically below the load-bearing eye during lifting operations.

Description

[0001] The invention relates to a chain sling for suspending a load from a crane hook, comprising a load-carrying eye for suspending the chain sling from the crane hook and at least one crossbeam connected to the load-carrying eye, to the ends of which at least one lifting chain is attached for attaching the load to be picked up.

[0002] It is known to suspend a load from a crane hook using a single- or multi-strand chain sling. For example, DE 37 23 173 A1, which is known from the prior art, discloses an overload control device that can be easily installed and indicates when the permissible load capacity of the chains has been exceeded, without the need for constant monitoring and / or measurement of the chains.

[0003] Another example is the sketch of the Figure 1, which shows a hook block 3 of a lifting device with a double hook 3.1. Two-leg chain slings 1, 2 are suspended via their load-bearing eyes 1.1, 2.1 on each side of the double hook 3.1, and the free ends of the chain slings 1, 2 are attached to the load 4, thus providing a total of four attachment points 1.5.1, 1.6.1, 2.5.1, and 2.6.1.

[0004] Since two chain strands are provided per chain sling, the compensating rocker (not shown here) is required, which forms the connecting link of the individual chain strands of a chain sling with the load-bearing eye 1.1 or 2.1.

[0005] In practice, however, symmetrical attachment of the load via four attachment points is not always possible. If, for example, it is necessary to attach the load via only two attachment points, Figure 1Either only suspension 1 or suspension 2 can be used. The use of only one leg per suspension 1 or 2 is not possible due to the built-in balancing rocker, as this would otherwise be incorrectly loaded. Using a double hook 3.1 and only one suspension 1 or 2 will result in a slanted position, as the load is introduced asymmetrically to the hook block 3. This is clearly shown in Figure 2 shown.

[0006] Therefore, an alternative solution is being sought that can overcome the aforementioned problem.

[0007] The object is achieved according to the invention by a chain sling according to the features of claim 1. Advantageous embodiments of the chain sling are the subject of the dependent claims.

[0008] Based on the prior art solution, the invention proposes equipping the crossbeam with suitable shortening devices at the end, allowing the end-mounted chain slings to be attached to corresponding loads even at variable lengths. This provides greater flexibility during load lifting and can compensate for asymmetrical load suspension. The suitable shortening device is one or more hooks mounted on the end of the crossbeam, which allow for the attachment of medium chain links of variable lengths, thus permitting quick and flexible changes to the actual available length of the chain slings.

[0009] The at least one chain sling that can be attached to the fastening device can be an additional chain sling. However, it is preferable to use one of the chain slings attached to the end of the crossbeam instead. This chain sling does not necessarily have to be detached from the end attachment point of the crossbeam; it is sufficient for the chain sling to be held by the additional fastening device in such a way that the force flow from the load via the chain sling essentially runs through the additional fastening device into the load-bearing eyelet.

[0010] According to a preferred embodiment, the load-bearing eyelet and the fastening means are suspended in a common hole in the crossbeam, preferably in a central eyelet of the crossbeam. This optimizes the direct flow of force between the fastening means and the load-bearing eyelet.

[0011] Fundamentally, the fastening means must be suitable for stable mounting of the chain sling on the crossbeam and for direct force transmission from the chain sling into the fastening means. According to a preferred embodiment, the fastening means is a hook onto which the chain sling can be hooked. This embodiment enables one of the chain slings mounted at the end of the crossbeam to be easily hooked in without first having to remove it from the end attachment point. For example, they can be permanently mounted at the ends of the crossbeam. By hooking in one of the middle chain links, it is also ensured that the force is transmitted via the central hook and not via the actual attachment point of the chain sling at the end of the crossbeam.

[0012] For the purpose of the invention, it is not absolutely necessary that the load-bearing eyelet or the sling chains be directly connected to the crossbeam. Alternatively, appropriate connecting links can be used, ideally so-called CW connecting links. The fastening device can also be connected to the crossbeam via a connecting link, in particular a CW connecting link.

[0013] In addition to the chain sling according to the invention, the present invention also relates to a device for load-bearing on a double hook, comprising at least one, preferably at least two, chain slings according to the present invention. The corresponding chain slings can, but do not necessarily have to, be designed identically. It is sufficient for the device according to the invention if at least one of the chain slings used is designed according to the present invention.

[0014] The respective chain slings are suspended with their load-bearing eyelets from different hooks of the double hook. Due to the inventive design of at least one of the chain slings, it is possible to use them either in single- or double-strand operation. For example, in regular operation, two attachment points on the load can be provided by at least one chain sling, while when using the fastening means and configuring single-strand operation, only one attachment point is required for the chain sling. If the chain sling according to the invention is used in combination with a chain sling according to Figure 3c If used in the device, the load can be attached to the double hook with four attachment points.

[0015] In addition to the device according to the invention, the present invention also relates to a lifting device, in particular a crane, ideally a mobile crane, with at least one double hook and a device according to the invention for receiving the load on a double hook. Consequently, the same advantages and properties arise for both the lifting device and the device as already explained above with reference to the chain sling according to the invention. For this reason, a repetitive description is omitted.

[0016] Further advantages and features of the invention are explained in more detail below using an exemplary embodiment illustrated in the figures. They show: Fig. 1: a hook block with double hooks and corresponding chain slings for load handling in four-leg operation according to the state of the art, Fig. 2: the use of the chain slings according to Figure 1in two-strand operation, Fig. 3a, b: Individual views of the chain slings according to the present invention and Fig. 3c: Individual views of the chain slings according to the prior art.

[0017] The representations according to the Figures 1 and 2 have already been discussed in the introductory part of the description. Therefore, only the solution according to the invention will be discussed below. A detailed illustration of a chain strand 10 according to the invention shows the Figure 3aThe load-bearing eyelet 10.1 is used to suspend the chain sling 10 from a single hook or double hook block 3.1 and is connected to the crossbeam 10.2 via a CW connecting link. Sling chains 10.5 and 10.6 are attached to the ends of the crossbeam 10.2, in particular via a CW connecting link each extending through a hole at the end of the crossbeam 10.2. A hook 10.3 is provided on the uppermost chain link of the sling chains 10.5 and 10.6, connected to the CW link, as a shortening device, allowing the sling chains 10.5 and 10.6 to be shortened to any desired length.

[0018] According to the invention, the crossbeam 10.2 comprises a central eyelet 10.21, via which the load-bearing eyelet 10.1 is connected to the crossbeam 10.2 by means of a CW link. Furthermore, the eyelet 10.21 serves to accommodate an additional fastening means in the form of another hook 10.4. This hook 10.4 is also connected to the eyelet 10.21 of the crossbeam 10.2 by a CW connecting link.

[0019] Suitable lifting devices 10.5.1 and 10.6.1 in the form of shackles are provided at the ends of the chain slings 10.5 and 10.6 for attaching the load.

[0020] In 4-strand operation, one of these chain slings 10 according to the invention is attached to a respective hook of the double hook 3.1 and a chain sling 2 is attached to the other hook, as is also the case, for example, in the solution according to Figure 1This provides two chain slings (10.5 and 10.6) per hook side, allowing the load to be supported via a total of four attachment points.

[0021] Alternatively, if only one attachment point is to be used for a chain sling 10, the chain sling 10 according to the invention can be used according to the Figure 3b be reconfigured. For this purpose, for example, the left chain sling 10.5 (as shown) or the right chain sling 10.6 is hooked into the additional hook 10.4 using one of its chain links and attached to the load at the end with the attachment point 10.5.1. This allows the force introduction from the load 4 via the chain sling 10.5 to flow centrally via the fastening device 10.4 into the load-bearing eyelet 10.1, thus completely preventing asymmetrical loading of the crossbeam 10.2.

[0022] If the equipment status is as per the Figure 1If both chain slings 1, 2 are designed in the form of the chain sling 10 according to the invention, this allows optionally a four-strand, three-strand, or even two-strand operation with corresponding four, three or two attachment points. Alternatively, only one of the chain slings 1, 2 of the Figure 1 in the form of the chain sling 10 according to the invention, only a four- or three-strand operation with four or three attachment points can be selected. Furthermore, the chain sling 2 of the Figure 3c in conjunction with the chain sling 10 according to the invention. In the chain sling 2 of the Figure 3c A crossbeam was omitted, the lifting chains 2.5, 2.6 are instead hooked directly into the load-bearing eyelet 2.1.

[0023] The inventive design of the chain sling 10 and its use for load handling allows for extremely flexible responses to the prevailing lifting conditions. For example, if the load can be picked up using only two attachment points, a symmetrical loading can always be ensured even when using a double hook block 3.1, thus preventing the Figure 2 shown disadvantageous diagonal pull with the swinging out of the double hook 3.1.

Claims

1. Chain suspension (10) for suspending a load on a crane hook, comprising a load receiving lug (10.1) for hanging the chain suspension on the crane hook, and at least one crossmember (10.2) which is connected to the load receiving lug and at the ends of which in each case at least one fastening chain (10.5, 10.6) for fastening the load to be received is or can be fixed, wherein the crossmember (10.2) comprises at least one fixing means (10.4) for at least one fastening chain (10.5, 10.6), which fixing means is arranged under the load receiving lug (10.1) during lifting operation in the vertical direction, characterised in that the crossmember (10.2) comprises, as a shortening means for the respective fastening chains (10.5, 10.6), at least one hook (10.3) in each case at the ends, for shortened hanging of the respective fastening chain (10.5).

2. Chain suspension according to claim 1, characterised in that the load receiving lug (10.1) and the fixing means (10.4) are hung in a common drilled hole of the crossmember (10.2), preferably in a central lug (10.2.1) of the crossmember (10.2).

3. Chain suspension according to either of the preceding claims, characterised in that the fixing means (10.4) is a hook, on which at least one of the fastening chains (10.5, 10.5), fixed to the crossmember (10.2) at the end, can be hung.

4. Chain suspension according to any of the preceding claims, characterised in that the load receiving lug (10.1) and / or at least one of the fastening chains (10.5, 10.6) and / or the fixing means (10.4) are connected to the crossmember (10.2) via connecting links, in particular CW connecting links.

5. Device for load receiving on a double hook (3.1) comprising at least one, preferably at least two, chain suspensions (10) according to any of the preceding claims, which can be hung on different hooks of the double hook of a crane by means of their load receiving lugs (10.1), characterised in that a load (4) can be fastened selectively with two, three or four fastening points (1.5.1, 1.6.1, 2.5.1, 2.6.1) by means of the chain suspension (10).

6. Lifting equipment, in particular crane, ideally mobile crane, comprising at least one double hook (3.1) and a device according to claim 6 as load receiving means.

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