Lifting hook pulley block for crane

Abstract

A hook pulley block for a crane includes at least one housing at least partially covering a rope pulley, a load hook for lifting a load, a crossbar connecting the at least one housing and the load hook, where the housing includes a handle for guiding the hook pulley block.

Description

Technical Field

[0001] This utility model relates to a hook pulley block, specifically to a hook pulley block for a crane. Background Art

[0002] A rope hoisting crane's hook pulley block typically consists of two rope pulleys with a crane hook positioned between them for moving the load. As the hook pulley block rises or falls, the rope pulleys rotate with the movement of the ropes. A safety hazard exists between the rope pulleys and the hoisting rope when a user attempts to grasp the hook block to guide it into the correct position. The user's fingers may become trapped between the rope pulleys and the hoisting rope, potentially causing serious injury to the user's fingers in the worst-case scenario. Utility Model Content

[0003] Therefore, one object of this invention is to provide a device for solving the above-mentioned problems. This invention is based on a hook pulley block with a handle. A hook pulley block for a crane includes: at least one housing that at least partially covers a rope pulley; a load hook for lifting and lowering a load; and a crossbar connecting the at least one housing and the load hook. The housing includes a handle for guiding the hook pulley block, and the housing includes two covers that can be fastened to each other, with the handle disposed opposite to the crossbar on the covers. The handle allows the user to easily grasp and guide the hook pulley block in a safe and reliable manner. Attached Figure Description

[0004] The present invention will now be described in more detail with reference to preferred embodiments and the accompanying drawings, in which:

[0005] Figure 1 A basic view of an exemplary hoisting device is shown;

[0006] Figure 2 This is an external view of the hook pulley block;

[0007] Figure 3 This is a front view of the hook pulley block;

[0008] Figure 4 A partial exploded view of the hook pulley block is shown. DETAILED DESCRIPTION

[0009] This utility model relates to a hook pulley block 1 for cranes, and particularly for bridge cranes, low headroom cranes, wall-mounted jib cranes or gantry cranes. Figure 1A simplified example of a lifting device for a bridge crane is shown. A hook pulley block 1 is part of the lifting device, which includes a lifting mechanism 2 having a rope drum 3 for winding the lifting rope 5. The hook pulley block 1 can move vertically by lengthening and shortening the free length of the lifting rope 5. The lifting mechanism 2 can move along the main beam via a trolley. The trolley can move from left to right along a first guide rail along the main beam via wheels. The wheels can be located beside the ends of the rope drum 3. The main beam can move transversely along a second guide rail, so that the main beam is typically supported at its ends by the second guide rail, where another set of wheels is arranged below the ends of the main beam. The second guide rail can be supported by the columns of the building. This allows the crane to move in both the x and y directions.

[0010] The lifting mechanism 2 may include a motor 4 and a transmission device for operating the rope drum 3. The rope drum 3 may have a single layer or multiple layers of winding for the lifting rope 5. The lifting rope 5 may be a synthetic rope, a metal rope, or a combination thereof. Figure 1 In this design, a 1×4 rope winding method is used, employing a single lifting rope 5, with four upper and lower rope sections visible between the rope drum 3 and the hook pulley block 1. However, other rope winding methods can be used.

[0011] Figure 2 An external view of a hook pulley block 1 according to one embodiment is shown. Figure 3 The front view of the hook pulley block 1 is shown. Figure 4 A simplified exploded view of the hook pulley block 1 is shown.

[0012] Reference Figure 2 The diagram illustrates a hook pulley assembly 1 according to one embodiment, comprising a load hook 11 and two housings 12. The load hook 11 and housings 12 are connected to each other by a crossbar 13. The term "crossbar" herein refers to any type of rigid structure suitable for connecting the load hook 11. The crossbar 13 is preferably made of metal. Each housing 12 can accommodate at least one rope pulley 14. The rope pulley 14 and the crossbar 13 may have a common central axis A, thus the rope pulley 14 is fastened to the crossbar 13, for example, via screws and end plates. The load hook 11 may be at least partially arranged in the area between the two housings 12.

[0013] A load hook 11 is attached to a crossbar 13 to lift a load. The load hook 11 can be secured to the crossbar 13 using, for example, a locking ring or a locking sleeve with a bearing. The bearing allows the load hook 11 to rotate about the vertical axis of the crossbar 13. The load hook 11 may include a safety latch 17 to prevent the load from slipping off the load hook 11.

[0014] The housing 12 may include two covers 18 that can be fastened to each other and also to the crossbar 13. The covers 18 may be arranged to completely cover the rope pulley 14 in the transverse direction of the central axis A. At least one flange 16 may be present on the circumference of the housing 12, arranged to at least partially radially cover the edge of the rope pulley 14 when the two covers 18 are fastened together, thereby preventing accidental contact with the rope pulley 14 by the user. To facilitate opening and closing of the housing 12, at least one nut or screw 15 may be fixed to one end of the central axis A.

[0015] The rope pulley 14 is rotatable, and the hoisting rope 5 can move freely within the housing 12 without contacting the housing 12. The cover 18 of the housing 12 can be correctly aligned in the correct position by means of, for example, screw holes and screws. For example, the cover 18 can be fastened to each other using four screws.

[0016] The housing 12 also includes a handle 19 for guiding the hook pulley block 1. The term "handle" herein can refer to any type and shape of structure—that is attached to the housing or to a part of the housing that a user can grasp. It can be a rod, a hole, a profile, or a rope. The handle 19 may extend from the housing 12 as a protrusion. The handle 19 may be located on both housings such that when the handles 19 are opposite each other on the hook pulley block 1, the user can grasp the handle 19 from either side. Thus, to grasp the handle 19, it is not necessary to rotate the hook pulley block 1 or for the user to move to the other side of the hook pulley block 1. The user can control the lifting from the most suitable side while observing other actions besides lifting.

[0017] The handle 19 can be positioned on the cover 18 facing away from the crossbar 13. This allows the user to see the handle 19 immediately when viewing the hook pulley block 1. When precision is required, the handle 19 helps guide the load to the correct position. It can also help reach slightly off-center positions if the load hook 11 cannot be lowered directly to the correct position.

[0018] Handle 19 can be attached to cover 18 as a separate component. This allows handle 19 to be adapted to existing hook pulley assemblies. Handle 19 can be, for example, a push-pull handle, an offset handle, a knob, a shaped handle, or a cup handle. For example, handle 19 can be attached to cover 18 by gluing or using fasteners. Handle 19 can be made of durable and shock-resistant materials, such as polycarbonate (PC), high-density polyethylene (HDPE), acrylonitrile butadiene styrene (ABS), or high-impact polystyrene (HIPS). Handle 19 can also be made of natural materials, such as rubber, wood, or metal. Handle 19 and cover 18 or housing 12 can be made of a combination of different materials. In some embodiments, handle 19 can be a rope, such as a synthetic rope, wherein at least one end of the rope is attached to cover 18 or housing 12.

[0019] Alternatively, the handle 19 can be integrated as part of the cover 18 and manufactured together with the cover 18 as a separate part. This allows for the omission of additional manufacturing steps for the handle 19 and additional fastening steps for attaching the handle 19 to the cover 18. The one-piece part can be manufactured in the same manner as the ordinary cover 18, for example, using die casting or injection molding.

[0020] Handle 19 can be arranged to absorb shock waves during an impact. If handle 19 is made of a material that is too brittle, it may break under impact. However, if handle 19 is made of a material that is too stiff, it may damage the load to be lifted or the surrounding structure. Therefore, it can preferably be made of an impact-resistant material that is strong enough to withstand minor impacts without damaging handle 19 or surrounding objects. Handle 19 can have a damping effect, for example, in the form of an additional pad 25 arranged at least partially on the outer surface of handle 19, or handle 19 itself can act as a damper. Pad 25 can be made of a material different from the rest of handle 19, such as a material with low hardness and high flexibility, such as rubber or silicone or foam.

[0021] The cross-section of the handle 19 can vary; for example, the middle portion of the handle 19 may be the thinnest, and the cross-section may increase towards the end portions of the handle 19—where the handle 19 is attached to the cover 18 or the housing 12. The longitudinal cross-section of the handle 19 can also vary alternatively or additionally; for example, the upper edge of the handle 19 may be the thickest at the top portion and thin towards the bottom portion. The top edge of the handle 19 may have a convex shape, such that the middle portion of the top edge is lower than the end portions.

[0022] like Figure 2-4As shown, the handle 19 can be formed as a horizontal bar located at the lower portion of the cover 18, protruding from the outer surface of the housing and having an opening (not visible). For safety reasons, it is preferable that the user grips the handle 19 from above, with fingertips pointing downwards. This allows the hook pulley assembly 1 to be held stably. The opening of the handle 19 can be formed in a frustoconical shape, such that the bottom portion is smaller than the top portion. An additional barrier may even be present to prevent the user from gripping the handle 19 from the bottom portion. The bottom portion can also be closed, thus the handle 19 forms a cup.

[0023] The one-piece cover 18 may include a slightly protruding sidewall 20, which is formed as an extension of the handle end. The sidewall 20 may be hollow or concave from the other side, so that the thickness of the sidewall 20 remains constant. This facilitates the manufacture of the handle 19 and provides greater rigidity to the handle 19.

[0024] The handle 19 can be located in the lower half of the housing 12, particularly in the lower third of the housing 12, and even more particularly in the lower quarter of the housing 12. The handle 19 can be located at the bottom edge of the cover 18. This allows the user to grip the handle 19 in the most ergonomic position without having to raise their arm excessively above their head. Its location at the bottom of the housing 12 also prevents the user from accidentally contacting the lifting rope 5, which could result in hand abrasions or, in the worst case, fingers being trapped between the rope pulley 14 and the lifting rope 5.

[0025] The housing 12 may also include finger guards 21 attachable to the housing 12. The finger guards 21 may have two protective portions or walls for each rope section, or the housing 12 may include two finger guards 21, one for each rope section. As the rope pulley 14 rotates within the housing 12, the finger guards 21 allow the hoisting rope 5 to move freely back and forth within the housing 12, but prevent the user's fingers from contacting the area between the rope pulley 14 and the hoisting rope 5.

[0026] Figure 2 and Figure 3 The finger guard 21 shown can slide along the periphery of the housing 12 during lifting. When the hook pulley block 1 is in its lowest position, the lifting rope 5 is almost vertical. When the hook pulley block 1 is in its highest position, i.e., close to the lifting mechanism 2, the angle of the lifting rope 5 differs from the vertical axis by approximately 35 degrees. By arranging the sliding finger guard 21, the finger guard 21 follows the rope angle, ensuring that the gap between the housing 12 and the lifting rope 5 does not become too wide. Changes in the rope angle guide and move the sliding finger guard 21.

[0027] The finger guard 21 may be curved and has a slightly curved first edge 22, which is arranged to slide beneath and follow the curve of the flange 16 of the housing 12. The finger guard 21 may have a second curved edge 23 opposite to the first edge 22, which is also arranged to slide beneath and follow the curve of the flange 16 of the housing 12. A slit 24 may be included between the first edge 22 and the guard portion to accommodate the flange 16 when the hoisting rope 5 is nearly vertical.

[0028] The finger protector 21 can be made from two identical parts, which can be attached to each other, for example, using screws. To save on material costs and provide a lighter weight, the finger protector 21 can have a honeycomb structure.

[0029] The finger guard 21 can be made of the same material as the cover 18, especially ABS, which has good machinability, surface quality, and chemical resistance. It is a sufficiently rigid material to maintain its shape and withstand impact well. Die casting or injection molding are also preferred.

Claims

1. A hook pulley block for a crane, comprising: At least one housing that at least partially covers a rope pulley. A load hook, used for lifting and lowering loads. A crossbar, which connects the at least one housing and the load hook, Its characteristics are, The housing includes a handle for guiding the hook pulley assembly, and the housing includes two covers that can be fastened to each other, with the handle disposed away from the crossbar on the covers.

2. The hook pulley block according to claim 1, characterized in that, The handle is integrated as part of the cover and is manufactured together with the cover as a separate part.

3. The hook pulley block according to claim 1, characterized in that, The handle is located at the lower half of the housing.

4. The hook pulley block according to claim 1, characterized in that, The handle is located at the lower third of the housing.

5. The hook pulley block according to claim 1, characterized in that, The handle is located at the lower quarter of the housing.

6. The hook pulley block according to any one of claims 1 to 5, characterized in that, The handle is formed as a horizontal bar that protrudes from the surface of the housing and has holes.

7. The hook pulley block according to claim 6, characterized in that, The bottom portion of the hole is narrower than the top portion of the hole.

8. The hook pulley block according to claim 1, characterized in that, The handle is made of shock-resistant material configured to absorb shock waves during an impact.

9. The hook pulley block according to claim 1, characterized in that, The cover includes protruding sidewalls.

10. The hook pulley block according to claim 1, characterized in that, The housing also includes a finger guard that can be attached to the housing.

11. The hook pulley block according to claim 10, characterized in that, The finger guard can slide along the periphery of the housing during hoisting.

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