Suspended load unloading tool

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 felled trees, 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, the rope is wound around the pulley in the same manner as above, and 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 is provided with a cylindrical brake portion. 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 is generated between the outer peripheral surface of the brake portion and the rope. Therefore, 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 of Patent Document 1, when changing the position where the pulley is suspended in order to change the unloading location, it is often necessary to also change the attachment position of the unloading aid. Since it takes time to attach the unloading aid, there is a problem of poor work efficiency when proceeding with the unloading operation while changing the unloading location. In addition, since the unloading aid is attached to the lower part of the vertical support, a worker who grips the rope on the ground side is required separately from the worker who performs operations such as tying the load to the rope at a high place, and this has also been a cause of reducing work efficiency.

[0005] Furthermore, in the case of the unloading aid of Patent Document 1, assuming that the load applied to the end of the rope to which the suspended load is tied is W, the point on the vertical support where the unloading aid is attached is also pulled by the rope, so a load of W is also applied there, and a load of 2W is applied to the point where the pulley is suspended. In reality, the rope to which the suspended load is tied sags slightly before starting to descend, so the suspended load drops a little until tension is applied to the rope after starting to descend. Considering the impact load caused by this drop, a load of 2W or more is applied to the point where the pulley is suspended. Therefore, when the suspended load is heavy, the load applied to the point where the pulley is suspended becomes extremely large, and a large mechanical strength is required for the object from which the pulley is suspended. For example, when using the branch of a felled tree as the suspended load, if a pulley is suspended from a branch protruding from a standing tree, the branch may break, which is dangerous.

[0006] In addition, the unloading aid of Patent Document 1 is provided with a clamp for attaching a braking part to a vertical support column which is a round pipe. However, when attaching the braking part to other objects such as the trunk of a standing tree or a square pipe, this clamp cannot be used, and separate contrivances for attachment are necessary. Also, techniques are required to attach it so that it does not come off. In the unlikely event that the braking part accidentally detaches from the attachment object during the use of the unloading aid, the braking part pulled by the rope may fly towards the pulley, posing a danger to the worker at height.

Prior Art Documents

Patent Documents

[0007]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0008] Therefore, in view of the above circumstances, an object of the present invention is to provide a suspended load unloading tool that can perform the work of lowering a suspended load while controlling the lowering speed with high work efficiency and high safety.

Means for Solving the Problems

[0009] To solve the above problems, the suspended load unloading tool according to the present invention “comprises a sheave, a sheave support body that rotatably supports the sheave, and a braking part integrated with the sheave support body, and the braking part has a columnar part for winding a rope below the sheave.”

[0010] When using the hoisting and lowering tool of the present invention, a rope is wound around the sheave from above. Among both ends of the rope hanging down from both sides of the sheave, a load is tied to one end as a suspended load, and after winding the rope on the other end side around the columnar portion, the operator then holds the rope on the tip side. When a load is applied to one end of the rope and the operator holds the other end side, causing tension in the rope, if the force of holding the rope is reduced, the wound rope tries to slide along the outer peripheral surface of the columnar portion, but frictional resistance occurs between the outer peripheral surface of the columnar portion and the rope. Therefore, compared to the case where the operator brakes the lowering speed of the suspended load only by the force of holding the rope, a greater braking force acts. Thus, 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 lowering speed.

[0011] Also, in this configuration, the brake portion having a columnar portion for winding the rope is integrated with the sheave support body that supports the sheave. Therefore, different from the hoisting and lowering assisting tool of Patent Document 1 where the mounting position of the brake portion had to be changed when changing the position of suspending the pulley along with the change of the hoisting and lowering location, in the present invention, it is sufficient to only change the suspending position of the hoisting and lowering tool. Thus, even when proceeding with the hoisting and lowering operation while changing the place to lower the suspended load, the operation can be performed efficiently.

[0012] Also, in the case of the hoisting and lowering assisting tool of Patent Document 1, since the brake portion was attached to the vertical support below the pulley, an operator who holds the rope on the ground side was required separately from the operator at a high place. In contrast, in the hoisting and lowering tool of the present invention, since the sheave support body and the brake portion are integrated, it is also possible for the operator at a high place to hold the rope and control the lowering speed of the suspended load. Therefore, it is possible to reduce the number of operators and the workload of the operator on the ground side, and ultimately improve the efficiency of the operation of lowering the suspended load.

[0013] Furthermore, in the hoisting and lowering tool of the present invention, since the sheave support and the brake part are integrated, if the load applied to the end of the rope where the suspended load is tied is W, the load applied to the point where the hoisting and lowering tool is suspended is also approximately equal to W. Therefore, compared with the load-lowering assisting tool of Patent Document 1 in which a load of about 2W is applied to the point where the pulley is suspended, the mechanical strength required for the structure to which the hoisting and lowering tool is suspended is smaller. Therefore, as a structure to which the hoisting and lowering tool is suspended, for example, even if a branch protruding from a standing tree is used, the risk of the branch breaking and the hoisting and lowering tool falling together is significantly reduced, and the safety is high, and the operation of lowering the suspended load can be performed.

[0014] Also, in the load-lowering assisting tool of Patent Document 1, when trying to attach the brake part to the trunk of a standing tree, etc., in the case of using a branch of a felled tree as a suspended load, the clamp for attaching to the vertical support cannot be used, and separate ingenuity is required, and technology is also required to attach it so that it does not come off. And during the use of the load-lowering assisting tool, if the brake part accidentally comes off the attachment object, there is a risk that the brake part will fly towards the pulley and pose a danger to the worker at a high place. On the other hand, the hoisting and lowering tool of the present invention does not have a member that may fly towards the worker at a high place, so it is highly safe and the operation of lowering the suspended load can be performed.

[0015] In addition to the above configuration, the hoisting and lowering tool according to the present invention "As the columnar part, it can be configured to have a first columnar part whose axial direction is parallel to the rotation support shaft of the sheave."

[0016] Since the axial direction of the first columnar portion is parallel to the rotation support axis of the sheave, it is possible to make the turning direction when the rope is wound around the sheave and the turning direction when the rope is wound around the columnar portion substantially the same. Therefore, the frictional resistance generated between the outer peripheral surface of the columnar portion and the rope does not become excessively large, and as the force with which the operator grips the rope is reduced, the rope easily slides along the outer peripheral surface of the columnar portion, and the rope smoothly rises while rotating the sheave. As a result, it is possible to smoothly lower the suspended load while controlling the lowering speed of the rope on the suspended load side.

[0017] In addition to the above configuration, the suspended load lowering tool according to the present invention "has a second columnar portion in which at least one end is a free end as the columnar portion, and the second columnar portion has a plurality of stoppers protruding from the outer peripheral surface at the end that is the free end, and the protruding directions of the plurality of stoppers are different" can be adopted.

[0018] Since the second columnar portion has an end that is a free end, there is a risk that the rope wound around the second columnar portion may come off from the free end. In this configuration, however, it has stoppers protruding from the outer peripheral surface at the free end. Therefore, the presence of this stopper can prevent the rope wound around the second columnar member from moving and coming off from the free end.

[0019] Also, there may be a case where it is desired to stop the suspended load from descending during the operation of lowering the suspended load. In this configuration, the second columnar portion has a plurality of stoppers protruding from the outer peripheral surface at the free end, and the protruding directions of the plurality of stoppers are different from each other. Therefore, the further tip side of the rope wound around the second columnar portion can be hooked on two of these plurality of stoppers and tied by a method called a half hitch (stopping knot), so that the rope can be fixed so as not to move. As a result, it is possible to stop the suspended load from descending.

[0020] That is, the stoppers protruding in different directions at the free end of the second columnar portion serve both to prevent the rope wound around the columnar portion from coming off the free end and to serve as an object to which the rope can 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 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 that can perform the operation of lowering the suspended load while controlling the lowering speed with high work efficiency and high safety.

Brief Description of the Drawings

[0022]

Figure 1

Figure 2

Figure 3

Modes for Carrying Out the Invention

[0023] 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 FIG. 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.

[0024] The sheave 10 is a disk-shaped rotating body that rotates around the support shaft 11. On the outer peripheral surface of the sheave 10, a groove portion 12 having a semi-circular arc shape that is recessed in the center in cross-section is formed, and when a rope is wound around it, the rope is held in the groove portion 12. Note that the support shaft 11 corresponds to the "rotating support shaft" of the present invention. In this written description, the "vertical" direction in the hoisting and lowering tool 1 refers to the vertical direction when the support shaft 11 is in the horizontal direction.

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

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

[0027] The support plate 22 is rotatable around the support shaft 11, is inclined with respect to the support plate 21, and can keep the gap S open when the upper end of the support plate 22 does not contact the closing portion 23. On the other hand, when the upper end of the support plate 22 is in contact with the closing portion 23, the gap S can be kept closed by maintaining this state. Here, as a means for maintaining the state where the upper end of the support plate 22 is in contact with the closing portion 23, the case of using the bolt 26 is exemplified. A hole (not shown in the drawing) through which the shaft portion of the bolt 26 passes is provided in the support plate 22, and an internal thread portion (not shown in the drawing) for fastening the male thread portion of the bolt 26 is formed in the closing portion 23. The bolt 26 may be of a type that is turned by hand or a type that is rotated by a tool.

[0028] Note that the means for maintaining the closed state of the gap S is not limited to using the bolt 26 as described above. For example, by protruding locking pieces in the same direction from both of the support plates 21 and 22 and passing a pin through the holes provided in each of the locking pieces, the state where the upper end of the support plate 22 is in contact with the closing portion 23 can also be maintained. When a bolt is not used to maintain the closed state of the gap S, it is not necessary to make the closing portion 23 into a thick flat plate shape, and it may be a small rod-shaped closing portion. Further, the means for opening and closing the gap S is not limited to rotating the support plate 22 around the support shaft 11 as described above. For example, the support plate 22 may be configured to be foldable in two around a hinge shaft, the gap S may be kept open in the folded state, and the support plate 22 may be fastened to the closing portion 23 with a bolt or the like in a state where both side surfaces of the hinge shaft are in a single plate shape, whereby the closed state of the gap S can be maintained.

[0029] In addition, in the present embodiment, the sheave support 20 further includes a suspension tool 28. The suspension tool 28 is used when suspending the hoisting and lowering tool 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 suspension tool 28 is illustrated, but other shapes such as a hook shape may also be used. Note that the suspension tool 28 is not necessarily required. By passing a rope different from the rope wound around the sheave 10 through the surplus space in the closed gap S, the hoisting and lowering tool 1 can be suspended from some structure using this rope.

[0030] The brake portion 30 has columnar portions 31, 33, and 34. The columnar portions 31, 33, and 34 all have portions located below the sheave 10, and a rope can be wound around those portions. The columnar portion 31 is cylindrical, is entirely located below the sheave 10, and its axial direction is parallel to the support shaft 11. That is, the columnar portion 31 corresponds to the "first columnar portion" of the present invention.

[0031] The columnar portions 33 and 34 are each columnar and extend downward from the lower end of the support plate 21. That is, when the support shaft 11 is in the horizontal direction, the axial directions of the columnar portions 33 and 34 are in the vertical direction (the vertical direction). The columnar portions 33 and 34 extend in parallel with a space therebetween, and the lower ends of each are fixed to the columnar portion 31. Therefore, the columnar portions 33 and 34 have both the function of being an object around which a rope is wound and the function of supporting the columnar portion 31 by the sheave support 20. Since the upper ends of the columnar portions 33 and 34 each extend from the support plate 21 and the lower ends are fixed to the columnar portion 31, they do not have free ends.

[0032] On the one hand, both ends of the columnar portion 31 are free ends not fixed anywhere. That is, the columnar portion 31 corresponds to the "first columnar portion" of the present invention and also corresponds to the "second columnar portion" of the present invention. The columnar portion 31 extends toward the support plate 22 side from the location where the columnar portions 33 and 34 are fixed, and also extends toward the opposite side. Therefore, ropes can be wound around both sides of the location where the columnar portions 33 and 34 are fixed in the columnar portion 31. Among the two free ends of the columnar portion 31, at one end, the stopper 36 protrudes upward and the stopper 37 protrudes downward. At the other end of the two free ends, the stopper 38 protrudes downward. That is, the protruding directions of the stoppers 36, 37, and 38 are directions perpendicular to the axial direction of the columnar portion 31. The stoppers 36, 37, and 38 are all cylindrical or tubular with an outer diameter of the cross section smaller than the outer diameter of the cross section of the columnar portion 31. The stoppers 36 and 37 are respectively constituted by both end portions protruding from the outer peripheral surface of the columnar portion 31 in a single cylindrical or tubular member penetrating the columnar portion 31, and protrude in opposite directions on the same straight line.

[0033] Note that the case where the columnar portion 31 is cylindrical is exemplified, but it may also be columnar. The case where the columnar portions 33 and 34 are columnar is exemplified, but they may also be cylindrical. Further, the columnar portions 31, 33, and 34 can be columnar or tubular having a polygonal cross-sectional shape with rounded corners.

[0034] Next, the usage method of the lifting and lowering tool 1 with the above configuration will be described with reference to FIGS. 2 and 3. First, the lifting and lowering tool 1 is suspended from some structure. The structure from which the lifting and lowering tool 1 is suspended is a branch protruding from a standing tree or a structure of a building structure, which is a portion extending horizontally from a vertical column or wall surface, or in a direction inclined slightly upward from the horizontal direction. Since the lifting and lowering tool 1 of the present embodiment is provided with the suspension tool 28, the suspension tool 28 can be used to suspend the lifting and lowering tool 1. FIG. 2 exemplifies the case where the lifting and lowering tool 1 is suspended from a branch 92 protruding from the trunk 91 of a standing tree 90.

[0035] In this state, the rope R is wound around the sheave 10 from above. Since the hoisting and lowering tool 1 of the present embodiment can open and close the gap S between the pair of support plates 21 and 22, the gap S is kept open, and the middle portion of the rope R can be wound around the sheave 10. Then, the gap S is closed.

[0036] Of the two end portions of the rope R hanging down from both sides of the sheave 10, a load to be lowered is tied to one end portion to form a suspended load 80, and after the rope on the other end portion side is wound around any of the columnar portions 31, 33, and 34, the rope on the more end portion side is gripped by the hand H of the operator.

[0037] FIG. 2 shows a case where the rope R is wound around the columnar portion 31. After the rope R is wound around the columnar portion 31, the load of the suspended load 80 is applied to one end portion of the rope R, and when the force for gripping the rope R is reduced in a state where the other end portion side of the rope R is gripped by the operator and tension is applied to the rope R, the wound rope R tends to slide along the outer peripheral surface of the columnar portion 31, but frictional resistance occurs between the outer peripheral surface of the columnar portion 31 and the rope R. Therefore, a greater braking force acts compared to the case where the operator brakes the lowering speed of the suspended load only by the force for gripping the rope R. Therefore, even when the suspended load 80 is heavy, the burden on the operator can be reduced and the suspended load 80 can be lowered while controlling the lowering speed.

[0038] In particular, the axial direction of the columnar portion 31 is parallel to the support shaft 11 of the sheave 10. Therefore, the turning direction when the rope R is wound around the sheave 10 and the turning direction when the rope R is wound around the columnar portion 31 are substantially the same. Therefore, the frictional resistance generated between the outer peripheral surface of the columnar portion 31 and the rope R does not become excessively large, and as the operator reduces the force for gripping the rope R, the rope R smoothly slides along the outer peripheral surface of the columnar portion 31, and the rope R smoothly rises while rotating the sheave 10. Thereby, the suspended load 80 can be smoothly lowered while controlling the lowering speed of the rope R on the suspended load 80 side.

[0039] In addition, since both ends of the columnar portion 31 are free ends, it is easy to wrap the rope R around the columnar portion 31, and the working efficiency is good. The free end can also be passed through a portion of the rope R that is formed into a loop in the middle, and then the rope R can be wrapped around the columnar portion 31. For example, as shown in FIG. 2, the portion of the rope R on the side opposite to the suspended load 80 that is formed into a loop is passed between the columnar portion 33 and the columnar portion 34, and then the columnar portion 31 is passed through the loop portion from the free end and positioned inside the stopper 38. Further, the rope R can be pulled out in the opposite direction from between the columnar portion 33 and the columnar portion 34 and wrapped around the columnar portion 31 one or more times inside the stoppers 36 and 37. By doing so, the entire length of the columnar portion 31 can be used for winding the rope R, and even though both ends of the columnar portion 31 are free ends, the wound rope R is prevented from coming off from the free end due to the presence of the stoppers 36, 37, and 38. Note that only one of the stoppers 36 and 37 that project upward and downward, respectively, is sufficient if it is only for the purpose of preventing the rope R from coming off from the free end.

[0040] Furthermore, the suspended load lowering tool 1 can wind the rope R on the side opposite to the suspended load 80 around a portion below the sheave 10 at either the columnar portion 33 or 34 instead of the columnar portion 31, and then the operator can grip and use the rope R on the end side thereof. Thereby, similarly to the above, since frictional resistance is generated between the outer peripheral surface of the columnar portion 33 or the columnar portion 34 and the rope R, a greater braking force acts compared to the case where the operator brakes the lowering speed of the suspended load only by the force of gripping the rope R. Therefore, even when the suspended load 80 is heavy, the burden on the operator can be reduced, and the suspended load 80 can be lowered while controlling the lowering speed.

[0041] In particular, when the axial direction of the columnar portions 33 and 34 is the vertical direction (perpendicular direction) with the direction of the support shaft 11 being the horizontal direction, the turning direction when the rope R is wound around the sheave 10 is different from the turning direction when the rope R is wound around the columnar portion 33 or the columnar portion 34. Therefore, compared with the case where the rope R is wound around the columnar portion 31, the frictional resistance generated between the outer peripheral surface of the columnar portions 33 and 34 and the rope R becomes larger, and when the force with which the operator grips the rope R is reduced, the rope R hardly slides along the outer peripheral surface of the columnar portions 33 and 34. That is, more braking is applied to the upward movement in which the rope R rotates the sheave 10 while ascending. Therefore, the columnar portions 33 and 34 are suitable for use when lowering the suspended load 80 while reducing the descending speed when the suspended load 80 is heavier.

[0042] Note that the number of times the rope R is wound around the columnar portions 31, 33, and 34 can be appropriately set according to the weight of the suspended load 80 and the speed at which the suspended load 80 is desired to be lowered. As the number of windings increases, the frictional resistance generated between the outer peripheral surface of the columnar portions 31, 33, and 34 and the rope R becomes larger, so that more braking can be applied to the descent of the suspended load 80.

[0043] There may be a case where it is desired to stop the suspended load 80 from descending during the operation of lowering the suspended load 80. In that case, as shown in FIG. 3, after increasing the number of windings around the columnar portion 31, the further end side of the rope R is hooked to both of the stoppers 36 and 37 that project upward and downward respectively, and tied by a method called a half hitch (stopping knot). As a result, the rope R is fixed so as not to move, so that the suspended load 80 can be stopped from descending. At one of the free ends of the columnar portion 31, the two stoppers 36 and 37 projecting in different directions serve both to prevent the rope R wound around the columnar portion 31 from coming off from the free end and to serve as an object to which the rope R is to 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 "plural stoppers projecting from the outer peripheral surface at the end which is the free end of the second columnar portion" in the present invention and are "stoppers having different projecting directions".

[0044] As described above, according to the hoisting and lowering tool 1 of the present embodiment, the brake portion 30 having the columnar portions 31, 33, and 34 around which the rope R is wound to brake the lowering of the suspended load 80 is integrated with the sheave support 20 that supports the sheave 10. Therefore, unlike the hoisting and lowering assisting tool of Patent Document 1 in which the attachment position of the brake portion had to be changed when changing the position where the pulley was suspended as the hoisting and lowering location was changed, it is sufficient to only change the suspension position of the hoisting and lowering tool 1. Therefore, when proceeding with the hoisting and lowering operation while changing the location where the suspended load 80 is lowered, the operation can be performed efficiently.

[0045] Further, in the case of the hoisting and lowering assisting tool of Patent Document 1, since the brake portion was attached to the vertical support below the pulley, an operator who grips the rope on the ground side was required separately from the operator at a high place. On the other hand, in the hoisting and lowering tool 1 of the present embodiment, the sheave support 20 that supports the sheave 10 and the brake portion 30 are integrated, and since the brake portion 30 is in the immediate vicinity of the sheave 10, it is also possible for the operator at a high place to perform the operation of gripping the rope R and controlling the lowering speed of the suspended load 80. Therefore, it is possible to reduce the number of operators and the workload of the operator on the ground side, and ultimately improve the efficiency of the operation of lowering the suspended load.

[0046] Furthermore, in the hoisting and lowering tool 1, since the sheave support 20 that supports the sheave 10 and the brake portion 30 are integrated, if the load at the end of the rope R where the suspended load 80 is tied is W, the load applied to the point where the hoisting and lowering tool 1 is suspended is also approximately equal to W. Therefore, compared with the hoisting and lowering assisting tool of Patent Document 1 in which a load of about 2W was applied to the point where the pulley was suspended, the mechanical strength required for the structure to which the hoisting and lowering tool 1 is suspended is smaller. Therefore, as a structure to which the hoisting and lowering tool 1 is suspended, for example, even if a branch protruding from a standing tree is used, the risk of the branch breaking and the hoisting and lowering tool 1 falling together is significantly reduced, and the operation of lowering the suspended load 80 can be performed with high safety.

[0047] In addition, in the unloading aid of Patent Document 1, when the branches of the felled tree are used as suspended loads, for example, when trying to attach the brake part to the trunk of a standing tree, etc., the clamp for attaching to the vertical support cannot be used, and separate contrivances are required. Also, technology is needed to attach it so that it does not come off. And if the unloading aid accidentally comes off the attachment object during use, there is a risk that the brake part will fly towards the pulley, posing a danger to the worker at height. In contrast, since the suspended load unloading tool 1 does not have a member that may fly towards the worker at height, it is highly safe and can perform the operation of lowering the suspended load 80.

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

[0049] For example, in the above embodiment, the case where the axial direction of the columnar part 31, which is entirely located below the sheave 10, is parallel to the support shaft 11 of the sheave 10 is illustrated. However, the brake part 30 may be configured to include a columnar part having an axial direction different from this. For example, the brake part 30 may include a columnar part connecting the lower ends of the two columnar parts 33, 34 extending downward from the lower end of the support plate 21.

[0050] Also, in the above, the case where the columnar part 31 is supported by the sheave support 20 via the two columnar parts 33, 34 extending downward from the support plate 21 is illustrated. However, it is not limited to this, and the columnar part 31 can also be supported by the sheave support 20 by a single columnar part extending downward from the support plate 21.

Explanation of reference numerals

[0051] 1 Suspended load unloading tool 10 Sheave 11 Support shaft (rotating support shaft) 20 Sheave support 30 Brake part 31 Columnar part (first columnar part, second columnar part) 33, 34 Columnar parts 36, 37 Stoppers (a plurality of stoppers protruding in different directions from the outer peripheral surface at the end which is the free end) R Rope

Claims

1. a sheave; a sheave support that rotatably supports the sheave; and a brake portion integrated with the sheave support, wherein the brake portion has a columnar portion for winding a rope below the sheave. The hoisting and lowering tool is characterized by this.

2. The hoisting and lowering tool according to Claim 1, characterized in that the columnar portion includes a first columnar portion whose axial direction is parallel to the rotation support axis of the sheave.

3. The columnar portion includes a second columnar portion having at least one free end, wherein the second columnar portion has a plurality of stoppers protruding from the outer peripheral surface at the free end, and the protruding directions of the plurality of stoppers are different. The hoisting and lowering tool according to Claim 1 or Claim 2, characterized by this.

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