Transport Hook

Abstract

The present invention relates to a transport hook for lifting and moving a load, wherein the transport hook (1) comprises a lever portion (2) with a coupling element (4) with which the transport hook (1) can be connected to a lifting device, and comprises a hook shank (3) which can engage in a hole (102) of the load (101) for lifting and moving the load (101.The hook shank (3) is connected with an angle section (14) to the lever portion (2) in such a way that an angle (o) between a line extending from the coupling element (4) to a vertex (SP) of the angle section (14) and a line extending along the hook shank (3) that is smaller than 90°.The hook can be used to pick up a load on an upwardly facing surface through a small opening and lift it securely. The transport hook can be provided with different locking elements that safely prevent the transport hook from being accidentally released.

Claims

1. A transport hook for lifting and moving a load comprising a plate-shaped section in which a hole is formed, wherein the transport hook comprises a substantially straight lever section with a coupling element with which the transport hook can be connected to a lifting device, and comprises a substantially approximately straight hook shank, wherein the hook shank is connected with an angle section to the lever portion in such a way that an angle is formed between a line extending from the coupling element to a vertex located on the inner surface of the angle section and a line extending along the hook shank, which is smaller than 90°, the hook shank and the angle section forming a continuous strand of approximately uniform thickness so that, for lifting and moving a load, the hook shank and the angle section can engage in the hole of the load and the hook shank or the angle section can engage behind an edge of the hole.

2. The transport hook according to claim 1, wherein the transport hook comprises a lever section with a coupling element with which the transport hook can be connected to a lifting device, and comprises a hook shank which can engage in a hole of the load for lifting and moving the load, wherein at least the hook shank is a round structure comprising a substantially round cross-section.

3. The transport hook according to claim 1, wherein the coupling element is formed as a coupling opening on the lever portion and/or the coupling means is arranged on the free end of the lever portion facing away from the hook shank.

4. The transport hook according to claim 1, wherein the transport hook is formed in one piece by cast, pressed from a powder, machined from a solid material or forged from a semi-finished product.

5. The transport hook according to claim 1, wherein the lever portion is plate-shaped, comprising a length (L) that is many times greater than a width (B) or thickness (H) of the lever portion.

6. The transport hook according to claim 1, wherein the hook shank is connected to the lever portion 2 by an angle section, which is formed adjacent to the angle section with an engagement area, wherein the engagement area, the angle section and the hook shank are each formed as a round structure with a substantially round cross-section.

7. The transport hook according to claim 6, wherein the diameter (D) of the engagement area, the angle section and the hook shank are substantially equal to the thickness (H) of the plate-shaped lever portion.

8. The transport hook according to claim 1, wherein a width (B) of the lever portion at a free end facing away from the hook shank is larger than a width (B) of the lever portion adjacent to the hook shank.

9. The transport hook according to claim 1, wherein the lever portion is many times longer than the engagement section of the hook shank.

10. A transport hook for lifting and moving a load according to claim 1, wherein the transport hook comprises a lever portion with a coupling element (4), via which the transport hook can be connected to a lifting device, and a hook shank that can engage through a hole of the load, wherein the hook shank is connected with an angle section to the lever portion, wherein a safety device is provided that comprises a locking part movably arranged on the transport hook in such a manner that it can form a protrusion on the hook shank so that a hook shank engaged through the hole can no longer escape from the hole.

11. The transport hook according to claim 10, wherein the locking part is loaded by means of a spring so that it can be moved against the resilience in such a way that it does not form a protrusion on the hook shank and the latter can be pulled out of the hole.

12. The transport hook according to claim 10, wherein the locking part comprises a locking rod, which is slidably mounted on the transport hook in the longitudinal direction.

13. The transport hook according to claim 10 wherein the lever portion comprises a retaining bracket, which is designed to retain the safety device.

14. The transport hook according to claim 10 wherein the angle section has a through hole, which forms a guide for the locking part.

15. The transport hook according to claim 10 wherein the locking part comprises a handle for actuating the locking part, wherein the handle can also be designed as a stop for fixing one or both end positions of the movable locking part.

16. The transport hook according to claim 14 wherein a latching mechanism is provided to releasable fix the movable locking part in one of its end positions.

17. The transport hook according to claim 1, wherein the transport hook comprises a locking element that secures the transport hook in the hole of the load.

18. The transport hook according to claim 17, wherein the locking element is connected to the hook shank in a swivel joint and is preferably elastically pretensioned into a locking position in which it protrudes from the hook shank, or into a position in which it rests against the hook shank.

19. The transport hook according to claim 17, wherein the locking element is adapted to lay against a surface of the hook shank when the engaging section is engaged through the hole of the load and elastically swivels to the locking position after engaging through the hole.

20. A lifting system for lifting and moving a load comprising a single or at least two substantially circular holes within a top surface of the load, the lifting system comprising: a single or two or more transport hooks, according to claim 1, wherein each of the transport hooks is connected to a rope or a chain and the ropes or chains are positioned at an end facing away from the transport hook so that they can be connected to a gripper of the lifting device.

21. A method of lifting and moving a structure comprising at least one hole within a plate-shaped section on a top surface of the load with at least one transport hook, comprising a hook shank, an angle section and a lever portion and the transport hook according to claim 1, wherein a hook shank of the transport hook is inserted through the preferably circular hole, an end of the lever portion remote from the hook shank with a lifting device with a tensile force, with a force vector loaded in a direction away from the hole, whereby the hook shank or the angle section are inserted into the circular hole and engage behind an edge of the hole to lift the structure.

22. The Method according to claim 21, characterized in that the diameter of the circular hole corresponds at least to the thickness of the plate-shaped section.

23. The method according to claim 21 wherein - the load in the area of the hole has a thickness that is smaller than twice the maximum diameter of the hook shank, and/or - a maximum hole diameter that is not larger than twice the maximum diameter of the hook shank, and/or - that the maximum hole diameter is smaller than a hook shank length (HSL), and/or - the hole is oval and, in particular, approximately circular.

Description

[0069] The figures show in detail:

[0070] FIG. 1: Transport hook with safety device in a view from the side;

[0071] FIG. 2: Transport hooks of FIG. 1 without a safety device in a perspective view;

[0072] FIG. 3: Top view of transport hook of FIG. 2;

[0073] FIG. 4: Transport hook of FIG. 2 from the side and in a sectional view along a central longitudinal axis;

[0074] FIG. 5: Transport hook with locking element pretensioned into the locking position;

[0075] FIG. 6: Transport hook with locking element, which is pressed into the locking position and held there by means of the safety device;

[0076] FIG. 7: Sketch of lifting system with two or three transport hooks;

[0077] FIG. 8: Sketched representation of the process steps for gripping and lifting a load with a transport hook; and

[0078] FIGS. 9a, 9b Transport hook with another locking element in the release position and the locking position;

[0079] FIGS. 10a 10b, 10c Transport hook with safety device with wings and nose.

[0080] FIG. 1 shows a transport hook 1 with which a load 101, for example a floor element of an event tent, can be lifted.

[0081] The transport hook 1 comprises a lever portion 2, a hook shank 3 and a retaining bracket 6 connected to a safety device 7 that can secure the transport hook 1 in engagement with and in a partial pass through a hole 102 in the load 101.

[0082] The lever portion 2 has a free end 2a and a coupling opening 4, acting as coupling element, close to a free end 2a remote from the hook shank 3.Adjacent to the hook shank 3 is an angle section 14 connecting the hook shank and the lever portion 2.The angle section is bent so that the lever portion 2 and the hook shank 3 are arranged at an angle to each other.

[0083] The lever portion 2 has an engagement region 15 adjacent to the angle section 14, which has substantially the same cross-sectional shape as the angle section 14 and the hook shank 3 to engage a hole 102 of a load 101 in certain situations, as explained below.

[0084] In the present embodiment, the engagement region 15, the angle section 14 and the hook shank 3 comprise a roughly circular cross-section that has somewhat flattened lateral surfaces 16. Preferably, the cross-section is shaped to be substantially edge-free so that it is free to rotate in a hole 102 around a hole axis 105, which runs centrally through the hole 102 and is perpendicular to a plate-shaped portion of the load in which the hole 102 is made. Substantially free of edges means that only an obtuse angle of, for example, more than 100° and in particular more than 150° is formed at edges. With such edges, the risk of entanglement with protrusions formed at the edge of the hole is low. Thus, in the embodiment example shown in FIG. 1, the flattened surfaces 16 with the approximately circular surfaces in cross-section each form edges 17, which enclose such an obtuse angle that there is no danger of entanglement.

[0085] The hook shank 3 is comprised of an engagement section 3a and a free end 3b remote from the angle section, which has a blunt shape, e.g. in the form of a ball segment.

[0086] In the embodiment example, the transport hook 1 is formed as a one piece or formed from one piece. This means, for example, that the transport hook 1 has been cut out of a plate material, produced in a casting process, pressed from powder or forged from a semi-finished product.

[0087] The safety device 7 comprises a mounting plate 7a and a locking part, which in the present embodiment is formed of a hollow cylinder 7b and a locking rod 7c with a free end 7d.The locking part further comprises a handle 9 that is connected to the locking rod 7c.The hollow cylinder 7b has an internal thread and the rear portion of the locking rod 7c has an external thread, which are engaged each other. With a lock nut 7e, on the one hand, the disk-shaped handle 9 is fixed to the locking part and, on the other hand, the relative position of the locking rod 7c to the hollow cylinder 7b can be adjusted. This allows the length of the locking part to be adjusted and adapted to the size of the hole 102 of a load 101 to be lifted with the transport hook 1.

[0088] The hollow cylinder 7b is slidably mounted in a through hole 10 of the retaining bracket 6.A compression spring (not shown) is arranged in the through hole 10, which is supported on the mounting plate 7a and applies a force to the locking part 7b, 7c, 7e, which pushes the locking part away from retaining bracket 6.

[0089] The locking rod 7c is slidably mounted in a through-hole 8, which extends through the angle section 14 and joins on the side of the hook shank 3 remote from the retaining bracket 6, so that the locking rod protrudes with its free end 7d on the hook shank 3 in a locking position (FIG. 1).

[0090] The through holes 8, 10 are aligned with each other, i.e. a center axis A10 of the hole 10 coincides with a center axis A8 of hole 8.

[0091] In the present embodiment, the handle 9 also serves as a stop to limit the movement of the locking parts 7b, 7c, 7e between the locking position and a release position.

[0092] In the locking position, the locking pin 7c on the hook shank 3 protrudes with its free end 7d and the handle 9 strikes the lever portion 2 at the engagement region 15.In the release position, the locking pin 7c is fully retracted with its free end 7d into the through hole 8 of the transport hook 1 and the handle 9 strikes the retaining bracket 6.The locking part can thus extend and retract with respect to the through hole 10.

[0093] In this release position, the locking rod can optionally be fixed by means of a locking mechanism (not shown), so that the locking rod is advantageously protected from damage, for example, in storage or during transport of the transport hook to a location where it is used. This locking mechanism can be activated, for example, by rotating the locking part around its longitudinal axis using the handle 9.The locking mechanism can also be designed in such a way that the handle 9 or other means can also be use to secure the locking part in the locking position, so that it cannot unintentionally move back to the release position.

[0094] The mounting plate 7a can have a through hole through which the locking part protrudes backwards via the locking plate 7a in the release position. This through hole then forms a further linear guide for the locking part. In the present embodiment example, mounting plate 7a is designed without through-hole. As an alternative to the handle 9, the mounting plate can provide a stop for the locking part in order to limit its movement into the release position.

[0095] The angle section 14 connects the engagement region 15 with the hook shank 3 at an angle, wherein the angle in the embodiment is less than 90°.In other embodiments of the transport hook, the angle can be approximately 90° or 90°.A connecting line V that extends through a coupling point and a vertex SP of angle section 15.The coupling point is the connection point at which, for example, a lifting device engages to lift the transport hook 1.In the present embodiment, the coupling point is the center point 4A of the coupling opening 4 where the transport hook 1 can be connected to the lifting device 200.The vertex SP is arranged at the inner surface of the angle section. A hook line HL runs along the inner surface of the hook shank 3.The connecting line V and the hook line HL intersect at an angle α that is smaller than 90° and preferably smaller than 85° and in particular smaller than 80° or smaller than 75°.

[0096] The smaller the angle α is, the more strongly the hook shank 3 engages behind a plate-shaped portion of a load in which the transport hook 1 is hooked in a hole, and the less it is necessary to arrange the lever portion 2 perpendicular to the plate-shaped portion of the load.

[0097] The hook shank 3 may have a partial sheath or coating 13, which, for example, has a nonskid surface and/or is made of an elastic material to mitigate or prevent damage to the edges of the holes.

[0098] FIG. 2 shows the transport hook 1 of FIG. 1 in a perspective view without the safety device 7.FIG. 2 shows the through hole 10 within a receptacle 6a for the safety device 7, and attachment points 11 in which the mounting plate 7a can be connected to the transport hook 1, for example screwed or positively received via corresponding connection elements not shown. In addition, FIG. 2 shows the through hole 8 for the locking rod 7c.

[0099] In the embodiment, the lever portion 2 is designed as a flat structure, i.e. it has two flat side walls 12, which run essentially parallel to each other. The side walls 12 can also extend at an angle to each other so that a thickness H (FIG. 3) and/or a width B of the lever portion 2 changes over the length L or part of the length of the lever portion.

[0100] The lever portion 2 has a first width B1 directly adjacent its engagement section 15 and a second width B2 near the free end 2a, which is approximately twice the width B1.In the embodiment example, the transition from the first width B1 to the second width B2 is stepwise, but the widening of the lever portion 2 along its length can also be carried out continuously.

[0101] The enlarging is designed in such a way that it points to the same side as the hook shank 3.The center of the coupling opening 4 can be offset a bit from a central longitudinal axis MLA (FIG. 4a) of the remaining lever portion 2.In the present embodiment, the offset corresponds approximately to the radius of coupling opening 4.Since the offset with respect to the central longitudinal axis MLA is directed towards the side on which the hook shank 3 is arranged, the angle α between the connecting line V and the hook line HL explained above is smaller than without offset, whereby angular deflection or engaging behind by the hook shank 3 is more pronounced.

[0102] FIG. 3 shows the transport hook 1 of FIG. 2 viewed from above. The transport hook 1 of the embodiment comprises a substantially uniform thickness H along its entire length L. This means, a diameter D of the substantially round or circular hook shank 3 corresponds to the thickness of the flat lever portion 2.The thickness H may also vary, for example, be smaller at the free end 2a than near the connection section 3c.

[0103] The transport hook 1 is of mirrored design with reference to a central longitudinal plane MLE (MLE is perpendicular to the drawing plane of FIG. 3).This means that the transport hook 1 can consist of two cast or molded parts that are joined together, for example welded together. This allows through holes 8 and 10 to be formed in the respective halves, thereby saving reworking of transport hook 1.

[0104] The top view of FIG. 3 shows, as in FIG. 2, the through hole 8 for the locking rod 7c of the safety device 7, the through hole 10 and the attachment points 11.

[0105] FIG. 4 comprises a Figure a) showing the transport hook 1 in a side view, a Figure b) showing another embodiment of the transport hook 1 with a free locking end 3e on the hook shank 3, and a Figure c) showing a section through the transport hook 1 of Figure a) along the central longitudinal plane MLE and parallel to the side walls 12. The transport hook in Figure c) comprises an optional magnet 19, in particular a permanent magnet, which additionally secures the transport hook 1 in the hole 102 if the load 101 is made of magnetic metal or comprises a metal that is attracted by the magnet 19.

[0106] FIG. 4a is substantially the same as the illustration of the transport hook 1 in FIG. 1, only without the safety device 7.Reference is therefore made to the description of FIG. 1.

[0107] FIG. 4b shows an alternative embodiment of the transport hook 1. This transport hook 1 comprises a lock in the form of a free locking end 3e that is connected to the engagement section 3c.The free locking end 3e protrudes from the engagement section 3c in a direction away from the lever portion 2 and extends in the longitudinal direction of the transport hook 1.The free locking end 3e and the engagement section 3c thereby form a kind of double nose, which reliably secures the transport hook 1 in the hole 102 of the load 101 when the transport hook 1 is not or not yet subjected to a tensile force by the transport device.

[0108] FIG. 4c shows a section through the transport hook 1 of FIG. 4a without the locking device 7.In this Figure, the courses of the through holes 8 and 10 within the hook shank 3 and the retaining bracket 6, respectively, can be seen for the first time. It is obvious that the center axis A10 of through hole 10 and the center axis A8 of through hole 8 are in line, that is, the two center axes A8 and A10 coincide. This allows through holes 10 and 8 to be created in two steps from one side, starting with through hole 10. It is also possible to drill the through hole 10 and the through hole 8 simultaneously with two tools from opposite sides.

[0109] In the further, a magnet 14 is connected to the transport hook 1, for example glued on or connected by force and/or form-fit. The magnet 14 provides an additional safeguard if the load 101 to be lifted is made of magnetic material or comprises magnetic material, for example metal particles in a reinforced plastic. The magnet 14 is preferably a permanent magnet which secures the transport hook 1 on the load 101, and which is easily released from the load 101 when the load 101 is lifted at a preferably predetermined weight.

[0110] FIG. 5 shows a transport lever 1 without retaining bracket 6 for connecting to a safety device 7.To secure the transport hook 1 in a hole 102 of a load 101, the transport hook 1 comprises a locking element 5 in the area of the hook shank 3, which is connected in the swivel joint S to the engagement section 3c. The locking element 5 is elastically pretensioned in the locking position shown and can be pressed against the tension force, for example by hand, on the hook shank 3 to be inserted into the hole 102 of a load 101 together with the hook shank 3 or the engagement section 3c. When the locking element 5 has passed completely through the hole 102, it is automatically moved by the elastic force into the locking position shown, thereby securing the transport hook 1 in the hole 102 of the load 101.

[0111] FIG. 6 shows a transport lever 1 with the safety device 7 and the locking element 5, which in this case is elastically pretensioned into a release position in which it lies against the hook shank 3. From this position, it can be moved by the safety device 7 against the elastic force into the locking position shown. For this purpose, the locking rod 7c presses with the free end 7d on the locking element 5, moves it to the locking position shown and fixes it in this position.

[0112] To set the locking element 5 in the locking position, the locking rod 7c can be secured in the position shown, for example by means of a locking mechanism (not shown) via the handle 9, for example the handle 9 on the locking rod 7c can be rotated to secure it in the telescoped position. To remove the transport hook 1 from the hole 102 of the load 101, it is then only necessary to release the locking rod 7c by the handle 9. The elastic recoil force acting on the locking element 5 can then push the locking element 5 back to the release position, which simultaneously moves the locking rod 7c back into the through hole 8 when the spring force of the locking element 5 is greater than the spring force applied to the locking rod 7c.

[0113] If a locking mechanism is provided for fixing the locking part in the locking position and in the release position, then the spring for acting on the locking part 7b, 7c, 7e can be omitted completely. This applies to all the embodiments explained, since the locking part is then held in a defined manner in the locking position as well as in the release position without a spring. However, the application of a spring is advantageous since the locking part always automatically assumes a defined position. The spring can also be arranged in such a way that the locking part is pressed into the release position. In this case, however, a locking mechanism should be provided that can fix the locking part in the locking position.

[0114] A transport hook 1 according to further embodiment is formed with a movable safety lever 20 on the lever portion 2 (FIGS. 9a, 9b). The safety lever 20 is pivotally mounted by means of a swivel joint 21 adjacent to the coupling opening on the side of the lever portion 2, from which the hook shank 3 also extends away. The safety lever 20 can be folded away from the hook shank 3 a short distance until the safety lever strikes the hook shank with a stop element 22 and a further swivel movement is blocked (FIG. 9b).

[0115] In the release position (FIG. 9a), the safety lever 20 is directly connected to the lever portion 2.The transport hook 1 can thus be inserted into a hole 102 of a load 101 with the hook shank 3 and pulled out again, the lever portion 2 being arranged approximately parallel to the surface of the load 101 for this purpose.

[0116] In the locked position, the safety lever 20 protrudes from the lever portion 2 on the same side as the hook shank 3 (FIG. 9b). This allows the hook leg to engage behind an edge at the hole 102 of a load 101.The lever portion 2 cannot be moved toward the surface of the load 101, so that the transport hook 1 cannot be removed from the hole 102.

[0117] The safety lever 20 thus forms a movable locking part on the transport hook 1, which can be used to secure the transport hook to the hole 102.

[0118] The safety lever can be secured in its end positions with a corresponding fixing device. This fixing device (not shown) may comprise, for example, a spring that is arranged between the lever portion 2 and the safety lever 20 and which pushes them apart. A fixing ring can wrap around the lever portion 2 and be displaced along the lever portion so that it also encloses the safety lever 20 resting against the lever portion 2 and secures it in its position resting against the lever portion 2 (FIG. 9a).By displacing the locking ring in the direction of the hook shank 3, the safety lever 20 can be released. Latching means can also be provided in instead of the spring, or in addition to the spring, which fix the safety lever in its end positions according to FIG. 9a and/or FIG. 9b. Instead of a pivotable safety lever, another movable locking part that is not pivotable can also be provided, which can form a protrusion that can be changed by the lever portion 2.

[0119] FIG. 7 shows in drawing a) an example of a first lifting system 100 supporting a plate-shaped load 101 or a structure with a plate-shaped section. The load 101 comprises three substantially circular holes 102 with a diameter slightly larger than the diameter D of the hook shank 3 (FIG. 3) of the transport hooks 1 which engage through the holes 102 of the load 101.The transport hooks 1 can be connected by ropes or chains 103 to a lifting device 200, which is shown in drawing a) as a directional arrow. The ropes 103 can be connected directly or via a connecting element 104 to the lifting device 200, for example a crane.

[0120] Drawing a) shows a second lifting system 100 supporting a plate-shaped load 101 or a structure with a plate-shaped section. The structure 101 comprises four substantially circular holes 102 with a diameter slightly larger than the diameter D of the hook shank 3 (FIG. 3) of the transport hooks 1 which engage through the holes 102 of the load 101. The transport hooks 1 can be connected by ropes or chains 103 to a lifting device 200, which is shown in drawing b) as a directional arrow. The ropes 103 can be connected directly or via a connecting element 104 to the lifting device 200, for example a crane.

[0121] Drawing c) shows a lifting system 100 with a load 101 in the form of a box or hollow structure. In the top surface 101 of the load 101, which forms a plate-shaped section, two holes 102 are inserted in which the transport hooks 1 engage. The transport hooks 1 are connected to a lifting device 200 via ropes 103, as shown in the drawings a) and b) of FIG. 7.

[0122] In FIG. 8, four hand-drawn sketches illustrate the process steps necessary to use one or more transport hooks 1 to grip and lift a load 101 with a substantially circular hole 102 in a plate-shaped section.

[0123] Drawing a) shows the transport hook 1 with the lever portion 2 and the hook shank 3, how it is brought to the circular hole 102 of load 101, for example by hand. In drawing b) the hook shank 3 is passed through the circular hole 102 of load 101 and protrudes downwards from the plate-shaped load 101.The lever portion 2 of transport hook 1 lies substantially flat on the top surface 101a of the load 101.

[0124] In drawing c) the transport hook 1 is connected via the coupling opening 4 to a lifting device 200 shown as a directional arrow in drawing c), for example a crane, and a tensile force is applied to the transport hook 1. This causes the transport hook 1 to rotate in the hole 102 of the load 101 around a lower edge of the inner peripheral wall 104 and the hook shank 3 to be swiveled toward a rear side 101b of the load 101.The transport hook 1 assumes the position shown in drawing c) as the end position when the load 101 is lifted by one of the lifting systems 100 of FIG. 7 comprising several holes 102 and several transport hooks 1.Also drawn in the drawing c) is the straight line V connecting the point of application of the lifting device 200 to the lever portion with the vertex SP of the angle section 14.The angle α between the straight line V and a second straight line on the top surface of the hook shank is less than 90°.

[0125] In drawing d), the single transport hook 1 has been moved by the lifting device 200, shown as a directional arrow in drawing d), to an end position in which the transport hook 1 carries the weight of the load 101.The load 101 hangs downward substantially vertically from the transport hook.

[0126] In the embodiment example shown in FIGS. 8a) to 8d), the plate-shaped section of load 101 comprising the hole 102 is thin compared to the hook shank 3.In the case of a thin load 101, by which is meant that it is thin in the area of the hole 102 compared to the thickness of the hook shank 3, it is sufficient if the hole 102 is only slightly larger than the cross-sectional area or the maximum diameter D of the hook shank 3.

[0127] However, thicker loads can also be lifted with the transport hook 1.The thicker the load 101 is in the area of the hole 102, the larger the hole 102 must be to allow the hook shank 3 and the angle section 14 to be inserted into the hole 102.This also depends on how much the hook shank 3 is bent relative to the lever portion 2.

[0128] Tests have shown that the maximum hole diameter should preferably not be larger than twice the maximum diameter D of the hook shank 3, in particular not larger than 1.8 times the maximum diameter D of the hook shank 3, or not larger than 1.5 times the maximum diameter D of the hook shank 3, or not larger than 1.3 times the maximum diameter D of the hook shank 3, so that the hook shank and the angle section can be inserted into the hole, on the one hand, and cannot escape, on the other hand, when the transport hook is under tension during lifting.

[0129] The thickness of the load in the area of hole 102 is preferably not larger than 2 times the maximum diameter D of the hook shank 3, in particular not larger than 1.5 times the maximum diameter D of the hook shank 3 or not larger than 1.3 times the maximum diameter D of the hook shank 3.

[0130] To prevent accidental escape, the maximum hole diameter should be smaller than a hook shank length HSL (FIG. 3 a), which is the distance between the free end 3b of the hook shank and the side of the lever portion 2 remote from the hook shank 3.The maximum diameter of the hole is preferably smaller than 0.8 times the length of the hook shank HSL, in particular smaller than 0.7 times the length of the hook shank HSL or smaller than 0.5 times the length of the hook shank HSL or smaller than 0.3 times the length of the hook shank HSL. This limits the maximum thickness of the load in the area of the hole.

[0131] The hole 102 is preferably circular. It may also deviate from the circular shape, whereby it is functional that the smallest hole diameter does not deviate from the largest hole diameter by more than 50%, preferably not more than 25% and in particular not more than 10%.

[0132] FIGS. 10a- 10c show the transport hook 1 of FIG. 1 in a modified form. The transport hook 1 comprises the lever portion 2 with the coupling opening 4 and the hook shank 3 which can engage through a hole 102 of a load 101 (both not shown) to lift and transport the load 101 by means of a lifting system 100 (not shown).The transport hook 1 comprises a safety device with which it can secured in the hole 102 or is secured when the transport hook 1 is subjected to a tensile force by the lifting system 100, so that the transport hook 1 cannot be unintentionally moved out of the hole 102 when the safety device is active.

[0133] To prevent the transport hook 1 from being inserted too deep into the hole 102, the transport hook 1 comprises a wing element 18, which may comprise two separate wings 18.1 and 18.2.The wing element 18 is connected to the transport hook 1 at a rear side 2b of the transport hook 1 facing the hook shank 3, preferably firmly connected by means of adhesion, a material-or force-fitting manner, etc. The wings 18.1.18.2 project laterally from the transport hook 1 in a view from above of the transport hook 1 as shown in FIG. 10a).The transport hook 1 has a diameter D in the area where the wing element 18 or - the wings 18.1, 18.6 is/are connected to the transport hook 1 (see FIG. 2).For example, the distance AFF between the outer ends 18.1a, 18.2a, the ends pointing away from the transport hook 1, can then correspond approximately twice the diameter D of the transport hook 1 in this area. However, the distance AFF can also be larger or smaller. The distance AFF can also be referred to as the span width of the wing element 18.

[0134] The wing element 18, when connected to the transport hook1 as shown, may protrude below the lower surface 2b of the lever portion 2 or the transport hook 1 in the vicinity of the connection area with the wing element 18, or may be arranged in a recess not explicitly shown, so that the wing element 18 does not protrude above the rear side of the transport hook 1, but is preferably planar with the surrounding surface of the transport hook 1.

[0135] The transport hook 1 further comprises a nose 23 formed on a top surface of the transport hook 1.In the embodiment shown, the nose 23 protrudes in a dormer shape from the top surface 2c facing away from the hook shank 3.The nose 23 comprises a planar front panel 23a facing the retaining bracket 6, which in the embodiment example shown is substantially parallel to the outer surface 6b of the retaining bracket 6 facing the nose 23.

[0136] The nose 23 is connected to the transport hook 1 in the area where there is an opening of the through hole 8, which forms an opening and guide for the locking rod 7c in the angle section 14.The nose 23 extends the through hole 23 and the front panel 23a advantageously forms a flat attachment surface for a drill for creating the through hole 8 in the angle section 14 of the transport hook 1.At the same time, the nose extends the guide area for the locking rod 7c and the locking rod 7c is better protected in the extended through hole 8.

[0137] The top surface of the nose 23 can run parallel to a central longitudinal axis of the locking rod 7c that is not shown. The height HN of the nose 23 in the area of the front panel 23a perpendicular to the central axis of the locking rod 7c can be selected in such a way that the nose 23 completely covers the handle 9 in a front view of the transport hook 1.This prevents the handle 9 from being unintentionally released from the locking position shown when the load is being picked up or transported. Thus, the last-described nose 23 reliably prevents, for example, a rope of the lifting system 100 or an unevenness of the load 101 from unintentionally moving the handle and thus no longer ensuring the safety of transport.

[0138] At its end facing the angle section 14, the nose 23 may have a distance NT from a tangent T, which bears against the surface of a leading end of transport hook 1, which distance depends on the diameter D of the hook shank 3 and/or the angle section 14.The distance NT can preferably be approximately twice the diameter D. However, the distance NT can also be smaller or larger than twice the diameter.

[0139] As shown in FIG. 10b, the height HN of the front panel 23a can be determined by an extension part 24, which is part of the nose 23 and is pre-formed together with the nose 23 or formed separately to the nose 23 and subsequently connected to the nose 23.In the latter case, the extension part 24 can be formed of a material different from the material of the nose 23, for example a plastic, and can be replaced in case of wear or damage.

[0140] The nose 23 can also comprise a locking element, be means of which the locking rod 7c can be secured in the locking position and preferably also in the rest position. For example, this locking element can be a slider that engages or latches into recesses on the locking rod 7c.In a solution, the extension 24 can form the locking element. Other known mechanisms for securing the locking rod 7c in fixed positions relative to the through hole 8 are included in the invention. With such a solution, the retaining bracket 6 can be omitted altogether, resulting in material savings and cost savings. FIG. 10b shows an embodiment in which handle 9 forms the end of the locking rod 7c.

[0141] Even if this is not explicitly shown in FIG. 10b, the retaining bracket 6 can be formed in a plate-like shape with a thickness in the longitudinal direction of transport hook 1 that is substantially smaller than that as shown in FIG. 10b, for example a steel plate with a thickness of 3 mm or 0.5 cm or 1 cm or some other dimension. In this case, the spring element not shown, which pretensions the locking rod 7c into the locking or resting position, would be arranged outside the retaining bracket 6 and would bear with one end against an outer side of the retaining bracket and with the other end against the handle. The spring is preferably a coil spring which encloses the locking rod 7c.In this embodiment, there is no requirement for a mounting plate 7a as provided for in the embodiments explained above. The spring element can be protected against contamination by an elastic sleeve.

TABLE-US-00001 Reference list: 1 Transport hook 2 Lever section 2a free end 2B Rear side 2c Surface 3 Hook shank 3a Intervention section 3b free end 3c Free fuse end 4 Coupling aperture 4A Plate center 5 Fuse element 6 Retaining plate 6a Receiver 6b Outer surface 7 Connecting device 7a Mounting plate 7b Hollow cylinder 7c Locking rod 7d free end 7e lock nut 8 Through hole 9 Handle bar 10 Through hole 11 Attachment point 12 Hole wall 13 Coating 14 Angle section 15 Engaging portion 16 flattened surface 17 Edge 18 Blade element 18.1a Blade tip 18.2 Blades 18.2a Blade tip MLE Median Longitudinal Plane A8 Center axis A10 Center axis α Angle