Lifting and unloading equipment

Abstract

To provide a suspended load unloading tool capable of carrying out unloading work while controlling a lowering speed with high work efficiency and high safety.SOLUTION: A suspended load unloading tool 1 comprises: a sheave 10; a sheave support 20 that rotatably supports the sheave 10; and a brake 30. The brake 30 is integrated with the sheave support 20, and provided with columnar parts 31, 33, and 34 for winding a rope R below the sheave 10. A suspended load 80 is fastened to one of both ends of the rope R wound on the sheave 10 from above, the rope on the other end side is wound on the columnar part 31, and the rope R on the end side is gripped by an operator to be used.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a lifting and lowering tool used when lifting and lowering a load from a high place.

Background Art

[0002] When lowering branches of a felled tree, building materials, etc. from a high place, a pulley and a rope may be used. In this case, the pulley is suspended from a branch protruding from a standing tree or a structure extending horizontally in a building structure, and a rope is wound around the pulley from above. Of the two ends of the rope hanging down from both sides of the pulley, one end is tied to the load to be lowered as a suspended load, and while the operator holds the rope on the other end side, the force being held is reduced, and the rope being held is raised while rotating the pulley, so that the suspended load can be lowered while adjusting the descending speed. However, in such a method, when the suspended load is heavy, it is difficult for the operator to control the descending speed of the suspended load only by the force of holding the rope.

[0003] Therefore, a load-lowering assist tool having a portion for winding a rope has been proposed (see Patent Document 1). This was proposed for the purpose of lifting and lowering members disassembled on a temporary scaffold, and a member having an arm portion inclined upward from the horizontal direction is attached to the upper part of the vertical support of the building frame member. The pulley is suspended from this arm portion, and after winding a rope around the pulley in the same manner as above, a suspended load is tied to one end of the rope. On the other hand, a load-lowering assist tool is attached to the lower part of the vertical support. The load-lowering assist tool includes a cylindrical brake portion, and after winding the rope on the opposite side of the suspended load around this brake portion, the operator holds the rope on the tip side. By winding the rope around the cylindrical brake portion, frictional resistance occurs between the outer peripheral surface of the brake portion and the rope, so that a greater braking force acts compared to the case where the operator brakes the descending speed of the suspended load only by the force of holding the rope. Therefore, even when the suspended load is heavy, the burden on the operator can be reduced and the suspended load can be lowered while controlling the descending speed.

[0004] However, in the case of the unloading aid described in Patent Document 1, if the position from which the pulley is suspended is changed in order to change the unloading location, the mounting position of the unloading aid must often also be changed. Since attaching the unloading aid is time-consuming, there was a problem of poor work efficiency when unloading work was carried out while changing the unloading location. In addition, since the unloading aid is attached to the lower part of the vertical support column, a worker is required on the ground side to hold the rope in addition to the worker who is performing tasks such as tying the load to the rope at a high place, which also contributed to the decrease in work efficiency.

[0005] Furthermore, in the case of the unloading aid described in Patent Document 1, if the load on the end of the rope to which the suspended load is attached is W, the rope will also pull on the point on the vertical support where the unloading aid is attached, so a load of W will be applied there as well, and a load of 2W will be applied to the point from which the pulley is suspended. In reality, the rope to which the suspended load is attached is somewhat slack before it starts to descend, so the suspended load will fall a little between the start of descent and the time when tension is applied to the rope. Taking into account the impact load from this fall, a load of more than 2W will be applied to the point from which the pulley is suspended. Therefore, if the suspended load is heavy, the load on the point from which the pulley is suspended will be very large, and the object from which the pulley is suspended will need to have great mechanical strength. For example, if the suspended load is a branch from a felled tree, suspending the pulley from a branch that is overhanging from a standing tree may cause the branch to break, which is dangerous.

[0006] Furthermore, while the unloading aid described in Patent Document 1 is equipped with a clamp for attaching the brake unit to a vertical support column which is a round pipe, this clamp cannot be used when attaching the brake unit to other objects such as tree trunks or square pipes. In such cases, a separate method of attachment is required, and skill is needed to ensure that the brake unit does not come off. If, by any chance, the brake unit comes off the object it is attached to unintentionally while the unloading aid is in use, the brake unit, which is being pulled by a rope, may fly towards the pulley, potentially endangering workers at heights. [Prior art documents] [Patent Documents]

[0007] [Patent Document 1] Japanese Patent Publication No. 2019-31903 [Overview of the project] [Problems that the invention aims to solve]

[0008] Therefore, in view of the above circumstances, the present invention aims to provide a load lowering device that can lower a suspended load with high work efficiency and safety while controlling the descent speed. [Means for solving the problem]

[0009] To solve the above problems, the load lowering device according to the present invention is: "Sheave and, A sheave support that rotatably supports the sheave, The sheave support is integrated with a brake section, The brake section has a columnar portion below the sheave for winding the rope. Occasionally, The columnar portion has a second columnar portion, at least one of which is a free end. The second columnar portion has a plurality of stoppers protruding from the outer surface at the end which is the free end, and the protruding directions of the plurality of stoppers are different They are something that "exist".

[0010] When using the load lowering device of the present invention, a rope is wrapped around the sheave from above, and a load is tied to one end of the rope hanging down from both sides of the sheave to form a suspended load. The other end of the rope is then wrapped around the columnar section, and the worker then grips the end of the rope. With the load of the suspended load applied to one end of the rope and tension applied to the rope by the worker gripping the other end, when the gripping force is reduced, the wrapped rope attempts to slide along the outer surface of the columnar section, but frictional resistance is generated between the outer surface of the columnar section and the rope. Therefore, a larger braking force is applied compared to when the worker applies braking to the descent speed of the suspended load using only the force of gripping the rope. Consequently, even when the suspended load is heavy, the burden on the worker is reduced, and the suspended load can be lowered while controlling the descent speed.

[0011] Furthermore, in this configuration, the brake section, which has a columnar part for winding the rope, is integrated with the sheave support that supports the sheave. Therefore, unlike the unloading aid in Patent Document 1, where the mounting position of the brake section had to be changed when the position of the pulley was changed due to a change in the unloading location, in the present invention, it is sufficient to change only the suspension position of the unloading device. As a result, even when unloading work is carried out while changing the location where the unloaded load is lowered, it can be operated efficiently.

[0012] Furthermore, in the case of the load unloading aid described in Patent Document 1, the brake unit was attached to the vertical support column below the pulley, requiring a worker on the ground to grip the rope in addition to the worker at the height. In contrast, in the load unloading device of the present invention, the sheave support and the brake unit are integrated, so the worker at the height can also perform the task of gripping the rope and controlling the descent speed of the suspended load. Therefore, it is possible to reduce the number of workers and the workload of the workers on the ground, and consequently improve the efficiency of the load unloading operation.

[0013] Furthermore, in the load lowering device of the present invention, since the sheave support and the brake section are integrated, if the load applied to the end of the rope to which the load is tied is W, then the load applied to the point from which the load lowering device is suspended is also approximately equal to W. Therefore, compared to the load lowering aid of Patent Document 1, which had a load of approximately 2W applied to the point from which the pulley was suspended, the mechanical strength required of the structure from which the load lowering device is suspended is smaller. Consequently, even if, for example, a branch overhanging from a standing tree is used as the structure from which the load lowering device is suspended, the risk of the branch breaking and the load lowering device falling together is greatly reduced, allowing for safer load lowering operations.

[0014] Furthermore, with the unloading aid described in Patent Document 1, when attempting to attach the brake unit to the trunk of a standing tree, such as when using felled tree branches as the suspended load, the clamp used for attaching to the vertical support cannot be used, requiring additional ingenuity, and technical skill is needed to ensure that it does not come off. Moreover, if the brake unit were to unintentionally detach from the object to which it is attached while using the unloading aid, the brake unit could fly towards the pulley, potentially endangering workers at height. In contrast, the unloading device of the present invention does not have any components that could fly towards workers at height, thus enabling safe unloading of suspended loads.

[0015] The lifting and lowering device according to the present invention has the above configuration in addition to the above configuration, The columnar portion may have a first columnar portion whose axial direction is parallel to the rotational support axis of the sheave.

[0016] Since the axial direction of the first columnar section is parallel to the rotation axis of the sheave, it is possible to make the rotation direction when the rope is wrapped around the sheave and the rotation direction when the rope is wrapped around the columnar section nearly identical. As a result, the frictional resistance between the outer surface of the columnar section and the rope does not become excessively large, and as the force with which the worker grips the rope is reduced, the rope slides easily along the outer surface of the columnar section, and the rope rises smoothly while the sheave rotates. This makes it possible to control the descent speed of the rope on the suspended load side and lower the suspended load smoothly.

[0017] The lifting and lowering device according to the present invention has the above configuration in addition to the above configuration, "The columnar portion has a second columnar portion, at least one of which is a free end." The second columnar portion may have a plurality of stoppers protruding from the outer circumferential surface at the end which is the free end, and the protruding directions of the plurality of stoppers are different.

[0018] Since the second columnar section has a free end, there is a risk that the rope wrapped around the second columnar section may come off from the free end. However, in this configuration, the free end has a stopper that protrudes from the outer surface. Therefore, the presence of this stopper prevents the rope wrapped around the second columnar section from moving and coming off from the free end.

[0019] Furthermore, there are times when it is necessary to stop the suspended load from descending during the lowering process. In this configuration, the free end of the second columnar section has multiple stoppers protruding from the outer surface, and the protrusion directions of these stoppers are different from each other. Therefore, by hooking the end of the rope wrapped around the second columnar section onto two of these stoppers and tying it using a half hitch (stopper knot), the rope can be fixed in place so that it does not move. This allows the suspended load to be stopped from descending.

[0020] That is, the stoppers protruding in different directions at the free end of the second columnar portion have the function of preventing the rope wound around the columnar portion from coming off from the free end, and the function of serving as an object to which the rope is to be tied when it is desired to stop the movement of the suspended load. The unloading aid of Patent Document 1 has a cylindrical brake portion with both ends being free ends, and has stoppers extending outward in a flange shape at each end. However, with the stopper of Patent Document 1 having such a configuration, although it can prevent the rope from coming off from the free end, it cannot tie and fix the rope when it is desired to stop the movement of the suspended load.

[0021] As described above, according to the present invention, it is possible to provide a suspended load lowering tool capable of performing the work of lowering a suspended load while controlling the lowering speed with high work efficiency and high safety.

Brief Description of the Drawings

Embodiments for Carrying Out the Invention

[0023] [[ID=2:5]] [[ID=2:6]]Hereinafter, a suspended load lowering tool 1 which is an embodiment of the present invention and its usage method will be described with reference to the drawings. First, the configuration of the suspended load lowering tool 1 will be mainly described with reference to Figure 1. The suspended load lowering tool 1 includes a sheave 10, a sheave support 20 that rotatably supports the sheave 10, and a brake portion 30 integrated with the sheave support 20. [[ID=2:7]]<00:00107>[[ID=2:8]]

[0024] [[ID=2:9]] The sheave 10 is a disc-shaped rotating body that rotates around the support shaft 11. A groove 12, which has a semi-circular cross-sectional shape with a depression in the center, is formed on the outer surface of the sheave 10, and when a rope is wrapped around it, the rope is held within this groove 12. The support shaft 11 corresponds to the "rotating support shaft" of the present invention. In this document, the "up and down" direction in the lifting and lowering device 1 refers to the vertical direction when the support shaft 11 is considered as the horizontal direction.

[0025] The sheave support 20 has a pair of support plates 21 and 22, and a closing portion 23 that closes the gap S between the pair of support plates 21 and 22 from above. The sheave 10 is positioned between the pair of support plates 21 and 22 and is rotatably supported at both ends by support shafts 11 attached to the support plates 21 and 22, respectively. Both of the pair of support plates 21 and 22 are flat plates, but in this embodiment one is formed to be thicker than the other. For convenience of explanation, the thicker support plate will be referred to as support plate 21, and the other as support plate 22.

[0026] The closing portion 23 may be configured to connect the upper ends of both support plates 21 and 22, but in this embodiment, it is connected to only one of the support plates 21 or 22 so that the gap S can be opened and closed. Specifically, the closing portion 23 is a thick, flat plate and extends from the upper end of support plate 21 toward support plate 22, thereby forming an inverted L shape together with support plate 21.

[0027] The support plate 22 rotates around the pivot shaft 11 and can be tilted relative to the support plate 21. When the upper end of the support plate 22 is not in contact with the closing part 23, the gap S can be opened. On the other hand, when the upper end of the support plate 22 is in contact with the closing part 23, the gap S can be closed by maintaining that state. As a means of maintaining the state in which the upper end of the support plate 22 is in contact with the closing part 23, the case in this example uses a bolt 26. The support plate 22 has a hole (not shown in the drawing) through which the shaft of the bolt 26 passes, and the closing part 23 has a female threaded part (not shown in the drawing) for fastening the male threaded part of the bolt 26. The bolt 26 may be a type that is turned by hand or a type that is rotated with a tool.

[0028] Furthermore, the means for maintaining the closed state of the gap S is not limited to using bolts 26 as described above. For example, the upper end of the support plate 22 can be kept in contact with the closing part 23 by having locking pieces protrude in the same direction from both support plates 21 and 22 and passing pins through holes provided in each locking piece. If bolts are not used to maintain the closed state of the gap S, the closing part 23 does not need to be a thick flat plate and may be a small rod-shaped closing part. Also, the means for opening and closing the gap S is not limited to rotating the support plate 22 around the pivot shaft 11 as described above. For example, the gap S can be kept closed by configuring the support plate 22 to be foldable around the hinge axis, opening the gap S when folded in half, and then fastening the support plate 22 to the closing part 23 with bolts or the like when both sides of the hinge axis are in the shape of a single plate.

[0029] In this embodiment, the sheave support 20 is further equipped with a lifting device 28. The lifting device 28 is used when suspending the load lowering device 1 from some structure and is attached to the upper surface of the closing portion 23 so as to protrude upward. Here, a ring-shaped lifting device 28 is shown as an example, but other shapes such as a hook shape may also be used. Note that the lifting device 28 is not necessarily required; the load lowering device 1 can be suspended from some structure using a rope separate from the rope wrapped around the sheave 10, by passing it through the excess space in the closed gap S.

[0030] The brake section 30 has columnar sections 31, 33, and 34. Each of the columnar sections 31, 33, and 34 has a portion located below the sheave 10, and a rope can be wrapped around this portion. The columnar section 31 is cylindrical, and its entirety is located below the sheave 10, with its axial direction parallel to the support shaft 11. In other words, the columnar section 31 corresponds to the "first columnar section" of the present invention.

[0031] The columnar sections 33 and 34 are each cylindrical in shape and extend downward from the lower end of the support plate 21. In other words, when the support axis 11 is in the horizontal direction, the axial direction of the columnar sections 33 and 34 is in the vertical direction. The columnar sections 33 and 34 extend parallel to each other with a gap between them, and their respective lower ends are fixed to the columnar section 31. Therefore, the columnar sections 33 and 34 serve both as objects around which the rope is wound and as supports for the columnar section 31 on the sheave support 20. Since the upper ends of the columnar sections 33 and 34 extend from the support plate 21 and their lower ends are fixed to the columnar section 31, they do not have free ends.

[0032] On the other hand, the columnar portion 31 has free ends at both ends that are not fixed anywhere. In other words, the columnar portion 31 corresponds to both the "first columnar portion" and the "second columnar portion" of the present invention. The columnar portion 31 extends toward the support plate 22 from the location where the columnar portions 33 and 34 are fixed, and also extends toward the opposite side. Therefore, a rope can be wrapped around the columnar portion 31 on both sides of the location where the columnar portions 33 and 34 are fixed. At one of the two free ends of the columnar portion 31, a stopper 36 protrudes upward and a stopper 37 protrudes downward. At the other of the two free ends, a stopper 38 protrudes downward. In other words, the protruding directions of the stoppers 36, 37, and 38 are perpendicular to the axial direction of the columnar portion 31. The stoppers 36, 37, and 38 are all cylindrical or cylindrical in shape, with an outer diameter of cross-section smaller than the outer diameter of the cross-section of the columnar portion 31. The stoppers 36 and 37 are formed from a single cylindrical or cylindrical member that penetrates the columnar portion 31, with each end portion protruding from the outer circumferential surface of the columnar portion 31, and thus protrude in opposite directions along the same straight line.

[0033] Although the example given illustrates that the columnar portion 31 is cylindrical, it may also be cylindrical, and although the example given illustrates that the columnar portions 33 and 34 are cylindrical, they may also be cylindrical. Furthermore, the columnar portions 31, 33, and 34 can be columnar or cylindrical with a polygonal cross-sectional shape having rounded corners.

[0034] Next, the method of using the load lowering device 1 with the above configuration will be explained using Figures 2 and 3. First, the load lowering device 1 is suspended from some structure. The structure from which the load lowering device 1 is suspended may be a branch extending from a standing tree, or a part of a building structure that extends horizontally from a vertical support or wall, or in a direction slightly upward from the horizontal. Since the load lowering device 1 of this embodiment is equipped with a lifting device 28, the load lowering device 1 can be suspended using this lifting device 28. Figure 2 illustrates the case where the load lowering device 1 is suspended from a branch 92 extending from the trunk 91 of a standing tree 90.

[0035] In this state, the rope R is wrapped around the sheave 10 from above. The load lowering device 1 of this embodiment can open and close the gap S between the pair of support plates 21 and 22, so the gap S can be left open and the middle portion of the rope R can be wrapped around the sheave 10. After that, the gap S is closed.

[0036] Of the ends of the rope R hanging down from both sides of the sheave 10, the load to be unloaded is tied to one end to form a suspended load 80, and the other end of the rope is wrapped around one of the columnar parts 31, 33, or 34, and the end of the rope beyond that is grasped by the worker's hand H.

[0037] Figure 2 illustrates the case where the rope R is wrapped around the columnar section 31. After wrapping the rope R around the columnar section 31, the load of the suspended load 80 is applied to one end of the rope R, and tension is applied to the rope R by the worker gripping the other end of the rope R. When the force gripping the rope R is reduced, the wrapped rope R attempts to slide along the outer surface of the columnar section 31, but frictional resistance is generated between the outer surface of the columnar section 31 and the rope R. Therefore, a larger braking force is applied compared to when the worker applies braking to the descent speed of the suspended load using only the force gripping the rope R. Consequently, even when the suspended load 80 is heavy, the burden on the worker is reduced, and the suspended load 80 can be lowered while controlling the descent speed.

[0038] In particular, the axial direction of the columnar portion 31 is parallel to the support axis 11 of the sheave 10. Therefore, the direction of rotation when the rope R is wrapped around the sheave 10 and the direction of rotation when the rope R is wrapped around the columnar portion 31 are almost the same. As a result, the frictional resistance generated between the outer surface of the columnar portion 31 and the rope R does not become excessively large, and as the force with which the worker grips the rope R is reduced, the rope R slides smoothly along the outer surface of the columnar portion 31, and the rope R rises smoothly while the sheave 10 rotates. This makes it possible to control the descent speed of the rope R on the suspended load 80 side and lower the suspended load 80 smoothly.

[0039] Furthermore, since both ends of the columnar section 31 are free ends, it is easy to wrap the rope R around the columnar section 31, resulting in good work efficiency. The rope R can also be wrapped around the columnar section 31 by passing the free end through a loop made in the middle of the rope R. For example, as shown in Figure 2, the loop made in the rope R on the opposite side of the suspended load 80 is passed between the columnar section 33 and the columnar section 34, and then the columnar section 31 is passed through the loop from the free end, positioned inside the stopper 38. Furthermore, the rope R can be pulled out in the opposite direction from between the columnar section 33 and the columnar section 34 and wrapped around the columnar section 31 at least once inside the stoppers 36 and 37. In this way, the entire length of the columnar section 31 can be used for wrapping the rope R, and even though both ends of the columnar section 31 are free ends, the presence of the stoppers 36, 37, and 38 prevents the wrapped rope R from coming off the free ends. Furthermore, if the sole purpose is to prevent the rope R from coming off its free end, it is sufficient to have only one of the stoppers 36 and 37, which protrude from the top and bottom, respectively.

[0040] Furthermore, the load lowering device 1 allows the rope R on the opposite side of the load 80 to be wrapped around the portion below the sheave 10 on either the columnar portion 33 or 34, rather than the columnar portion 31, and then the end of the rope R can be gripped and used by the worker. As a result, frictional resistance is generated between the outer surface of the columnar portion 33 or columnar portion 34 and the rope R, similar to the above, resulting in a greater braking force compared to when the worker applies braking to the descent speed of the load solely by gripping the rope R. Therefore, even when the load 80 is heavy, the burden on the worker can be reduced, and the load 80 can be lowered while controlling the descent speed.

[0041] In particular, the axial direction of the columnar sections 33 and 34 is vertical when the direction of the support shaft 11 is considered horizontal. Therefore, the direction of rotation when the rope R is wrapped around the sheave 10 is different from the direction of rotation when the rope R is wrapped around the columnar section 33 or columnar section 34. As a result, compared to when the rope R is wrapped around the columnar section 31, the frictional resistance between the outer surface of the columnar sections 33 and 34 and the rope R is greater, and when the force with which the worker grips the rope R is reduced, the rope R is less likely to slide along the outer surface of the columnar sections 33 and 34. In other words, the upward movement of the rope R while rotating the sheave 10 is more effectively braked. Consequently, the columnar sections 33 and 34 are suitable for use when the suspended load 80 is heavier and the descent speed is reduced while lowering the suspended load 80.

[0042] The number of times the rope R is wrapped around the columnar sections 31, 33, and 34 can be appropriately set depending on the weight of the suspended load 80 and the desired descent speed. The more times the rope is wrapped, the greater the frictional resistance between the outer surfaces of the columnar sections 31, 33, and 34 and the rope R, thereby allowing for a greater braking force on the descent of the suspended load 80.

[0043] There are times when it is necessary to stop the suspended load 80 from descending during the lowering process. In such cases, as shown in Figure 3, the number of times the rope R is wrapped around the columnar section 31 is increased, and the ends of the rope R are then hooked onto both the stoppers 36 and 37 that protrude upwards and downwards, respectively, and tied using a half hitch (stopper knot). This fixes the rope R in place so that it does not move, thus stopping the suspended load 80 from descending. The two stoppers 36 and 37, which protrude in different directions at one of the free ends of the columnar section 31, serve to prevent the rope R wrapped around the columnar section 31 from coming off the free end, and also serve as targets to which the rope R can be tied when it is desired to stop the movement of the suspended load 80. Note that the stoppers 36 and 37 correspond to the "multiple stoppers protruding from the outer surface at the free end" of the second columnar section in this invention, and "stoppers with different protruding directions".

[0044] As described above, in the load lowering device 1 of this embodiment, the brake section 30, which has columnar parts 31, 33, and 34 around which a rope R is wrapped to brake the descent of the load 80, is integrated with the sheave support 20 that supports the sheave 10. Therefore, unlike the load lowering aid of Patent Document 1, which required changing the mounting position of the brake section when changing the position where the pulley is suspended to change the load lowering location, it is sufficient to change only the suspension position of the load lowering device 1. As a result, when lowering work is carried out while changing the location where the load 80 is lowered, the work can be carried out efficiently.

[0045] Furthermore, in the case of the unloading aid described in Patent Document 1, the brake unit was attached to the vertical support column below the pulley, requiring a worker on the ground to grip the rope in addition to the worker at the height. In contrast, in the unloading device 1 of this embodiment, the sheave support 20 that supports the sheave 10 and the brake unit 30 are integrated, and the brake unit 30 is located very close to the sheave 10, so the worker at the height can also perform the task of gripping the rope R and controlling the descent speed of the unloaded load 80. As a result, it is possible to reduce the number of workers and the workload of the workers on the ground, and ultimately improve the efficiency of unloading the unloaded load.

[0046] Furthermore, in the load lowering device 1, the sheave support 20 that supports the sheave 10 and the brake section 30 are integrated. Therefore, if the load at the end of the rope R to which the load 80 is tied is W, the load on the point from which the load lowering device 1 is suspended is also approximately equal to W. Consequently, compared to the load lowering aid of Patent Document 1, where a load of approximately 2W was applied to the point from which the pulley was suspended, the required mechanical strength of the structure from which the load lowering device 1 is suspended is smaller. Therefore, even if, for example, a branch overhanging from a standing tree is used as the structure from which the load lowering device 1 is suspended, the risk of the branch breaking and the load lowering device 1 falling together is greatly reduced, allowing for safer operation of lowering the load 80.

[0047] Furthermore, with the unloading aid described in Patent Document 1, when attempting to attach the brake unit to the trunk of a standing tree, such as when using felled tree branches as the suspended load, the clamp used for attaching to the vertical support cannot be used, requiring a separate ingenuity, and technical skill is needed to ensure that it does not come off. Moreover, if the unloading aid were to unintentionally detach from the object to which it was attached during use, the brake unit could fly towards the pulley, potentially endangering workers at height. In contrast, the suspended load unloading device 1 does not have any components that could fly towards workers at height, thus enabling the unloading of the suspended load 80 with high safety.

[0048] Although preferred embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various improvements and design changes are possible without departing from the spirit of the present invention, as shown below.

[0049] For example, in the above embodiment, the axial direction of the columnar portion 31, which is located entirely below the sheave 10, is shown to be parallel to the support shaft 11 of the sheave 10. However, the brake portion 30 can be configured to include a columnar portion whose axial direction is different. For example, the brake portion 30 may include a columnar portion that connects the lower ends of two columnar portions 33 and 34 that extend downward from the lower end of the support plate 21.

[0050] Furthermore, the above example illustrates a case in which the columnar portion 31 is supported by the sheave support 20 via two columnar portions 33 and 34 that extend downward from the support plate 21. However, the example is not limited to this, and the columnar portion 31 can also be supported by the sheave support 20 via a single columnar portion that extends downward from the support plate 21. [Explanation of Symbols]

[0051] 1. Lifting and unloading equipment 10 Sheaves 11. Support shaft (rotation support shaft) 20 Sieve support 30 Brake section 31 Columnar part (first columnar part, second columnar part) 33,34 Columnar part 36,37 Stoppers (Multiple stoppers protruding in different directions from the outer surface at the free end) R Rope

Claims

1. Sheave and, A sheave support that rotatably supports the sheave, The sheave support is integrated with a brake section, The brake section has a columnar portion below the sheave for winding the rope, The columnar portion has a second columnar portion, at least one of which is a free end. The second columnar portion has a plurality of stoppers protruding from the outer surface at the end which is the free end, and the protruding directions of the plurality of stoppers are different. A lifting and lowering device characterized by the following features.

2. The columnar portion has a first columnar portion whose axial direction is parallel to the rotational support axis of the sheave. The lifting and lowering device according to feature 1.

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