Lifting device and method for suspending an object using the lifting device

Abstract

To provide a technique capable of reducing the inclination angle of an object with respect to the ground. [Solution] A sling device for suspending an object includes a plurality of wire parts, one end of each of which is connected to a fulcrum and the other end of each of which is connected to the object. A specific wire part of the plurality of wire parts includes a first columnar part, a second columnar part connected to the first columnar part and movable in the axial direction of the specific wire part relative to the first columnar part, the second columnar part being movable between a shortest position where the axial length of the specific wire part is shortest and a longest position where the axial length of the specific wire part is longest, and a locking part that restricts the second columnar part from moving in a first direction from the shortest position toward the longest position and allows the second columnar part to move in a second direction opposite to the first direction.

Description

[Technical field]

[0001] TECHNICAL FIELD The technology disclosed herein relates to a hanging device and a method for suspending an object using the hanging device. [Background technology]

[0002] Patent Document 1 discloses a hoisting device for suspending an object. This hoisting device includes a plurality of wire parts, each of which has one end connected to a fulcrum and the other end connected to the object. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2013-011122 A Summary of the Invention [Problem to be solved by the invention]

[0004] When an object is viewed from above, the position of the center of gravity of the object may not coincide with the position of the geometric center of the object. When such an object is suspended using a hoisting device, the part of the object to which the wire part located near the center of gravity is connected is inclined so as to be located lower than the part to which the other wire parts are connected. In other words, the object is suspended by the hoisting device in a state in which the object is inclined with respect to the ground. It is desirable to reduce the inclination angle of the object with respect to the ground.

[0005] This specification provides a technique that can reduce the inclination angle of an object with respect to the ground. [Means for solving the problem]

[0006] In a first aspect disclosed in the present specification, a sling device for suspending an object may include a plurality of wire parts, each having one end connected to a fulcrum and the other end connected to the object. A specific wire part of the plurality of wire parts may include a first columnar part, a second columnar part connected to the first columnar part and movable in an axial direction of the specific wire part relative to the first columnar part, the second columnar part being movable between a shortest position where the axial length of the specific wire part is shortest and a longest position where the axial length of the specific wire part is longest, and a locking part that restricts the second columnar part from moving in a first direction from the shortest position to the longest position and allows the second columnar part to move in a second direction opposite to the first direction.

[0007] Assume a situation in which an object is suspended using the above-mentioned hoisting device. In an initial state, the length of the specific wire part is maximum, and the lengths of the multiple wire parts are the same. When the object is viewed from above, the multiple wire parts are arranged at approximately equal intervals from the geometric center of the object. The specific wire part is connected to the position of the multiple wire parts that is closest to the center of gravity of the object. In this case, the fulcrum of the hoisting device is located above the geometric center of the object and is away from the center of gravity of the object. In this situation, when the object is suspended using the hoisting device, the part to which the specific wire part is connected is located lower than the parts to which the other wire parts are connected. When the suspended object is lowered, the lower surface of the part of the lower surface of the object to which the specific wire part is connected touches the ground first. When the object is further lowered, a load acts on the specific wire part in a direction that shortens the length of the specific wire part. In this case, the second columnar part of the specific wire part moves in the second direction. This shortens the length of the specific wire part. By shortening the length of the specific wire portion, the position of the center of gravity of the object and the position of the fulcrum of the hoisting device become closer when the object is viewed from above. When the object is then suspended using the hoisting device, the inclination angle of the object with respect to the ground becomes smaller than the inclination angle when the specific wire portion is at its maximum length. Therefore, the inclination angle of the object with respect to the ground can be reduced.

[0008] In a second aspect, in the first aspect, the locking portion may be movable between a locked position and an unlocked position. When the locking portion is located at the locked position, the locking portion may restrict the second columnar portion from moving in the first direction and allow the second columnar portion to move in the second direction, and when the locking portion is located at the unlocked position, the locking portion may allow the second columnar portion to move in the first direction and the second direction, and when the second columnar portion is located at the shortest position, the locking portion may be located at the unlocked position, and when the second columnar portion is located at the longest position, the locking portion may be located at the locked position, and the second columnar portion may move from the shortest position to the longest position.

[0009] According to the above configuration, the locking portion is located in the unlocked position by positioning the second pillar portion at the shortest position. Therefore, the second pillar portion can be moved in the first direction, and the length of the specific wire portion can be lengthened again. Therefore, the worker can use the lifting device repeatedly, improving the convenience of the worker.

[0010] In a third aspect, in the above second aspect, the locking portion may repeatedly move between the locked position and the unlocked position until the second columnar portion moves from the longest position to the shortest position.

[0011] According to the above configuration, during the time when the second columnar portion moves from the longest position to the shortest position, the second columnar portion can be restricted from moving in the first direction every time the lock portion moves to the locked position.

[0012] In a fourth aspect, in the second or third aspect, the specific wire portion may further include a biasing member that biases the lock portion from the unlocked position to the locked position, and a retaining portion that is movable between a retaining position that retains the lock portion at the unlocked position and a non-retaining position that does not retain the lock portion. The retaining portion may move from the non-retaining position to the retaining position when the second columnar portion reaches the shortest position, and move from the retaining position to the non-retaining position when the second columnar portion reaches the longest position.

[0013] According to the above configuration, when the second columnar portion reaches its shortest position, the locking portion can be reliably positioned in the unlocked position, and when the second columnar portion reaches its longest position, the locking portion can be reliably positioned in the locked position.

[0014] In a fifth aspect, in the fourth aspect, the hoisting device may further include a first stopper portion and a second stopper portion. The first stopper portion may restrict the second columnar portion from moving in the first direction beyond the longest position and move the holding portion from the holding position to the non-holding position when the second columnar portion reaches the longest position, and the second stopper portion may restrict the second columnar portion from moving in the second direction beyond the shortest position and move the holding portion from the non-holding position to the holding position when the second columnar portion reaches the shortest position.

[0015] According to the above configuration, the configuration of the lifting device can be simplified compared to a configuration in which the member that restricts the second columnar portion from moving in the first direction beyond the longest position and the member that moves the holding portion from the holding position to the non-holding position when the second columnar portion reaches the longest position are separate members, and / or a configuration in which the member that restricts the second columnar portion from moving in the second direction beyond the shortest position and the member that moves the holding portion from the non-holding position to the holding position when the second columnar portion reaches the shortest position are separate members.

[0016] In a sixth aspect, in any one of the first to fourth aspects, each of the plurality of wire portions may include the first columnar portion, the second columnar portion, and the lock portion.

[0017] When the multiple wire parts include a wire part that does not include a first columnar part, a second columnar part, and a lock part, the worker needs to work so that the wire part is not connected to a position closest to the center of gravity of the object. That is, the worker needs to know the position of the center of gravity of the object in advance. According to the above configuration, the worker does not need to know the position of the center of gravity of the object. Therefore, the convenience of the user is improved.

[0018] In a seventh aspect, a method for suspending an object using the suspension device described in the first aspect may include a hanging process for suspending the object using the suspension device with the plurality of wire portions connected to the object, and a proximity process for lowering the object after the hanging process and placing the object on the ground, thereby shortening the length of a particular wire portion and bringing the suspension support portion closer to above the center of gravity of the object.

[0019] According to the above configuration, the inclination angle of the object with respect to the ground surface can be reduced. [Brief description of the drawings]

[0020] [Figure 1] 1 is a schematic diagram of the lifting device 10 in a state in which an object 100 is being lifted. [Diagram 2] FIG. 13 is a diagram showing a configuration in which the rail 30 is positioned at the shortest position. [Diagram 3] FIG. 13 is a diagram showing a configuration in which the rail 30 is positioned at the longest position. [Figure 4] 5A to 5C are diagrams showing the operation of the rail 30 and the lock portion 52. [Diagram 5] FIG. 3 is a view of the rail 30 from the positive Z direction side. [Figure 6] 1A to 1C are diagrams showing a procedure for hoisting an object 100 using the hoisting device 10. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] (Example) The hoisting device 10 will be described with reference to Fig. 1 to Fig. 5. The hoisting device 10 in Fig. 1 is a sling-type hoisting device, and is used to suspend an object 100. As an example, the object 100 is a building material, a framework, or a panel.

[0022] The hoisting device 10 includes four wire portions 12A to 12D. In the hoisting device 10 of this embodiment, the four wire portions 12A to 12D have the same structure. In the following, the wire portion 12A will be described in detail as an example, and detailed descriptions of the wire portions 12B to 12D will be omitted.

[0023] The wire portion 12A will be described with reference to Fig. 1 to Fig. 5. In the following, the direction of the central axis A of the wire portion 12A in Fig. 2 is defined as the "X direction", the vertical direction in Fig. 2 is defined as the "Z direction", and the direction perpendicular to the X direction and Z direction is defined as the "Y direction".

[0024] As shown in FIG. 1, the wire portion 12A has a first tube portion 14, a second tube portion 16, an extension unit 18 (see FIG. 2), and an upper attachment portion 20. The first tube portion 14 and the second tube portion 16 extend along the direction of the central axis A (see FIG. 2). The first tube portion 14 and the second tube portion 16 have a cylindrical shape. The upper attachment portion 20 is connected to an end portion 14A of the first tube portion 14 on the negative side in the X direction. The upper attachment portion 20 is attached to a hook 200 of a crane or the like. As shown in FIG. 2, a part of the second tube portion 16 is accommodated in the first tube portion 14 and is connected to the first tube portion 14. As shown in FIG. 1, the second tube portion 16 extends in the positive direction in the X direction from an end portion 14B of the first tube portion 14 on the positive side in the X direction. A lower attachment portion 22 is provided at an end portion of the second tube portion 16 on the positive side in the X direction. The lower attachment portion 22 is attached to a hook portion 102A provided on the left front portion of the upper surface of the target object 100.

[0025] As shown in FIG. 2, the telescopic unit 18 is housed in the first tube portion 14. The telescopic unit 18 includes a rail 30 and a locking mechanism 32. The rail 30 extends along the X direction (i.e., the direction of the central axis A). The second tube portion 16 is connected to the end of the rail 30 on the positive side of the X direction. The rail 30 is configured to be movable within the first tube portion 14 along the X direction. When the rail 30 moves, the second tube portion 16 moves, and the length of the wire portion 12A changes. The rail 30 is provided with a plurality of recesses 40. The plurality of recesses 40 are arranged at equal intervals along the X direction. As shown in FIG. 5, the length of the recesses 40 in the Y direction is smaller than the length of the rail 30 in the Y direction.

[0026] A first stopper portion 42 and a second stopper portion 44 are provided on the surface of the rail 30 on the positive side in the Z direction. The first stopper portion 42 and the second stopper portion 44 protrude from the surface of the rail 30 on the positive side in the Z direction. The first stopper portion 42 is provided at the end of the rail 30 on the negative side in the X direction, and the second stopper portion 44 is provided at the end of the rail 30 on the positive side in the X direction. The first stopper portion 42 and the second stopper portion 44 are provided at both ends in the Y direction. In the Y direction, the first stopper portion 42 and the second stopper portion 44 are provided outside the recess 40. In the Y direction, the interval between the first stopper portions 42 and the interval between the second stopper portions 44 are larger than the size of the recess 40.

[0027] 2, the locking mechanism 32 includes an arm portion 50 and a lock portion 52. The arm portion 50 is disposed so as to be movable on the rail 30. The arm portion 50 includes a first arm portion 54 extending in the Z direction, and a second arm portion 56 extending in the negative X direction from an end of the first arm portion 54 on the positive Z direction side. Although not shown, the length of the first arm portion 54 in the Y direction is substantially the same as the length of the rail 30 in the Y direction.

[0028] A spring receiving portion 60 formed by recessing in the negative Z direction is provided on the surface of the locking portion 52 on the positive Z direction side. A compression spring S attached to the first cylindrical portion 14 is disposed in the spring receiving portion 60. The compression spring S biases the locking portion 52 in the negative Z direction relative to the first cylindrical portion 14.

[0029] The locking portion 52 further includes a first surface 62 on the negative X-direction side and a second surface 64 on the positive X-direction side. The first surface 62 is a flat surface parallel to a plane including the Y-direction and the Z-direction. The second surface 64 includes a first inclined surface 66, a connecting surface 67, a flat surface 68, and a second inclined surface 70. In the positive Z-direction, the second inclined surface 70, the flat surface 68, and the first inclined surface 66 are arranged in this order. The first inclined surface 66 and the second inclined surface 70 are inclined toward the negative X-direction side as they move toward the negative Z-direction. The flat surface 68 is a flat surface parallel to a plane including the Y-direction and the Z-direction. The connecting surface 67 connects the first inclined surface 66 and the flat surface 68. The connecting surface 67 is a flat surface parallel to a plane including the X-direction and the Y-direction. Although not shown in the figure, the size of the locking portion 52 in the Y-direction is smaller than the size of the recess 40 of the rail 30 in the left-right direction.

[0030] (Operation of rail 30 and lock portion 52) The wire portion 12A in Fig. 1 expands and contracts as the rail 30 (see Fig. 2) moves along the X direction. The rail 30 is configured to be movable between a shortest position (see Fig. 2) where the length of the wire portion 12A is shortest, and a longest position (see Fig. 3) where the length of the wire portion 12A is longest. The operation of the rail 30 and the locking mechanism 32 will be described. Note that the state where the length of the wire portion 12A is longest will be described as the initial state.

[0031] As shown in FIG. 3, when the rail 30 is in the maximum position, the surface of the first arm portion 54 on the negative X-direction side abuts against the first stopper portion 42. In this case, the arm portion 50 and the lock portion 52 are separated by the first stopper portion 42, and the lock portion 52 is not held by the arm portion 50. Therefore, the end of the lock portion 52 on the negative Z-direction side is disposed in the recess 40 of the rail 30 by the biasing force of the compression spring S. Hereinafter, the position of the arm portion 50 when the arm portion 50 is not holding the lock portion 52 as shown in FIG. 3 will be referred to as the "non-holding position."

[0032] When a load in the negative X-direction acts on the rail 30, the rail 30 moves in the negative X-direction. When the rail 30 moves in the negative X-direction, the surface of the recess 40 on the positive X-direction side comes into contact with the second inclined surface 70 of the locking portion 52, as shown in FIG. 4(A). Because the second inclined surface 70 is inclined, the locking portion 52 moves in the positive Z-direction as the rail 30 moves in the negative X-direction. As a result, the locking portion 52 becomes disposed between the two recesses 40 that are aligned in the X-direction, as shown in FIG. 4(B).

[0033] When the rail 30 moves further in the negative X-direction, the locking portion 52 is positioned on the positive Z-direction side of the recess 40. In this case, as shown in FIG. 4C, the locking portion 52 is disposed in the recess 40 of the rail 30 by the biasing force of the compression spring S. Then, in response to the load in the negative X-direction acting on the rail 30, the rail 30 and the locking portion 52 operate in the same manner as described above, and the rail 30 moves in the negative X-direction. Note that, even if a load in the positive X-direction acts on the rail 30 in the state of FIG. 4C, the rail 30 does not move in the positive X-direction. This is because the first surface 62 of the locking portion 52 is a flat surface, and the first surface 62 abuts against the surface of the recess 40 in the negative X-direction, thereby restricting the movement of the rail 30 in the positive X-direction. In the following, the position of the locking portion 52 where the movement of the rail 30 in the positive X-direction is restricted and the movement of the rail 30 in the negative X-direction is permitted is referred to as the "lock position".

[0034] As shown in FIG. 2, when the rail 30 moves further in the negative X-direction, the surface of the first arm portion 54 on the positive X-direction side abuts against the second stopper portion 44. As a result, the surface of the second arm portion 56 of the arm portion 50 on the negative X-direction side abuts against the first inclined surface 66 of the lock portion 52. Since the first inclined surface 66 is inclined, the lock portion 52 moves in the positive Z-direction as the arm portion 50 moves in the negative X-direction. As a result, the lock portion 52 is disposed on the positive Z-direction side of the rail 30. That is, the lock portion 52 is held by the arm portion 50. In this state, the rail 30 can move in the positive X-direction and the negative X-direction in the range from the maximum position to the minimum position. That is, the lock portion 52 allows the rail 30 to move in the positive X-direction and the negative X-direction. Hereinafter, the position of the lock portion 52 at which the rail 30 is allowed to move in the positive X-direction and the negative X-direction is referred to as the "unlocked position". Moreover, the position of the arm portion 50 that holds the lock portion 52 in the unlocked position will be referred to as the "holding position."

[0035] After FIG. 2, when the rail 30 is pulled in the positive X-direction by the worker, the rail 30 moves in the positive X-direction. Then, as shown in FIG. 3, the surface of the first arm portion 54 on the negative X-direction side abuts against the first stopper portion 42. This restricts the movement of the arm portion 50 in the positive X-direction. Then, the arm portion 50 and the lock portion 52 are separated, and the lock portion 52 is placed in the locked position by the biasing force of the compression spring S. In this way, after the length of the wire portion 12A becomes the longest, the lock portion 52 of this embodiment repeatedly moves between the locked position (see FIGS. 4A and 4C) and the unlocked position (FIG. 4B) until the rail 30 moves from the longest position to the shortest position. Then, every time the lock portion 52 is placed in the locked position, the movement of the arm portion 50 in the positive X-direction is restricted.

[0036] (Method for suspending an object 100 using a hoisting device 10) With reference to FIG. 6, a method for suspending an object 100 substantially parallel to the ground using the hoisting device 10 of this embodiment will be described. In FIG. 6, for ease of viewing, the configuration of the wire parts 12A-12D is simplified, and the hook parts 102A-102D of the object 100 and the hook 200 are omitted. The object 100 in FIG. 6 is an object whose center of gravity is located at the left front. In the initial state shown in FIG. 6(A), the lengths of the wire parts 12A-12D are at their maximum. That is, the rails 30 of the wire parts 12A-12D are located at their maximum positions (see FIG. 2). In addition, when the hoisting device 10 and the object 100 are viewed from above, the wire parts 12A-12D are connected to the hook parts 102A-102D of the object 100 (see FIG. 1) at substantially equal intervals from the geometric center of the object 100. In this state, when the hoisting device 10 and the object 100 are viewed from above, the fulcrum of the hoisting device 10 supported by the hook 200 is located above the geometric center of the object 100.

[0037] First, the object 100 is suspended using the suspension device 10 (suspension process). As shown in Fig. 6(B), since the center of gravity of the object 100 is located at the left front, the object 100 is tilted so that the left front part is located lower than the right rear part.

[0038] Next, as shown in FIG. 6(C), the object 100 is lowered. Since the object 100 is inclined so that the left front part is located lower than the right rear part, the left front part of the object 100 hits the ground first. By further lowering the object 100, a load acts on the rail 30 of the wire part 12A connected to the left front part of the object 100 in a direction to move the rail 30 in the negative X direction. As a result, the rail 30 moves in the negative X direction, and the length of the wire part 12A becomes shorter. Then, when the hoisting device 10 and the object 100 are viewed from above, the fulcrum of the hoisting device 10 moves to the left front part from the initial state. That is, the hoisting fulcrum part approaches the upper part of the center of gravity of the object 100 (approaching process). In this state, when the object 100 is suspended using the hoisting device 10, the object 100 becomes approximately parallel to the ground.

[0039] If the target object 100 is inclined with respect to the ground even after the above procedure is performed, the hanging process and the approach process are repeatedly performed, whereby the wire portions 12A-12D contract, and the target object 100 hoisted by the hoisting device 10 becomes approximately parallel to the ground.

[0040] As described above, the hoisting device 10 for suspending the target object 100 includes a plurality of wire portions 12A-12D, each of which has an upper end connected to the hook 200 (an example of a "suspension fulcrum") and a lower end connected to the target object 100. The wire portion 12A (an example of a "specific wire portion") includes a first tube portion 14 (an example of a "first columnar portion") and a second tube portion 16 connected to the first tube portion 14 and movable in the axial direction of the wire portion 12A relative to the first tube portion 14, the second tube portion 16 being movable between a shortest position where the length of the wire portion 12A in the direction of the central axis A (an example of an "axial direction") is shortest and a longest position where the length of the wire portion 12A is longest, and a lock portion 52 that restricts the second tube portion 16 from moving in the positive X direction (an example of a "first direction") from the shortest position toward the longest position, and allows the second tube portion 16 to move in the negative X direction (an example of a "second direction").

[0041] According to the above configuration, as shown in FIG. 6, when the object 100 is suspended using the hoisting device 10, the part to which the wire portion 12A is connected is located lower than the parts to which the other wire portions 12B to 12D are connected. When the object 100 suspended by the hoisting device 10 is lowered, the lower surface of the part of the lower surface of the object 100 to which the wire portion 12A is connected first touches the ground. When the object 100 is further lowered, a load acts on the wire portion 12A in a direction to shorten the length of the wire portion 12A. In this case, the second tube portion 16 of the wire portion 12A moves in the negative direction of the X direction. This shortens the length of the wire portion 12A. By shortening the length of the wire portion 12A, the position of the center of gravity of the object 100 and the position of the fulcrum of the hoisting device 10 become closer when the object 100 is viewed from above. Thereafter, when the target object 100 is suspended using the hoisting device 10, the inclination angle of the target object 100 with respect to the ground becomes smaller than the inclination angle when the wire portion 12A is at its maximum length. Therefore, the inclination angle of the target object 100 with respect to the ground can be reduced.

[0042] The locking portion 52 is movable between a locked position (see FIG. 3) and an unlocked position (see FIG. 2). When the locking portion 52 is in the locked position, it restricts the second tube portion 16 from moving in the positive X direction and allows the second tube portion 16 to move in the negative X direction. When the locking portion 52 is in the unlocked position, it allows the second tube portion 16 to move in both the positive and negative X directions. When the second tube portion 16 is in the shortest position, the locking portion 52 is in the unlocked position, and when the second tube portion 16 is in the longest position, it is in the locked position. The locking portion 52 is in the unlocked position until the second tube portion 16 moves from the shortest position to the longest position.

[0043] According to the above configuration, by positioning the second tubular portion 16 at the shortest position, the lock portion 52 is positioned at the unlocked position. Therefore, the second tubular portion 16 can be moved in the positive X-direction, and the length of the wire portion 12A can be lengthened again. Therefore, the worker can repeatedly use the lifting device 10, improving the convenience for the worker.

[0044] Furthermore, the lock portion 52 repeatedly moves between the locked position and the unlocked position until the second cylindrical portion 16 moves from the maximum position to the minimum position.

[0045] According to the above configuration, during the time when the second tube portion 16 moves from the longest position to the shortest position, the lock portion can restrict the second tube portion 16 from moving in the positive X-direction every time the lock portion moves to the locked position.

[0046] The wire portion 12A further includes a compression spring S (an example of a "biasing member") that biases the lock portion 52 from the unlocked position to the locked position, and an arm portion 50 (an example of a "holding portion") that is movable between a holding position that holds the lock portion 52 in the unlocked position and a non-holding position that does not hold the lock portion 52. The arm portion 50 moves from the non-holding position to the holding position when the second cylindrical portion 16 reaches the shortest position, and moves from the holding position to the non-holding position when the second cylindrical portion 16 reaches the longest position.

[0047] According to the above configuration, when the second tubular portion 16 reaches the shortest position, the lock portion 52 can be reliably positioned in the unlocked position, and when the second tubular portion 16 reaches the longest position, the lock portion 52 can be reliably positioned in the locked position.

[0048] The hoisting device 10 further includes a first stopper portion 42 and a second stopper portion 44. The first stopper portion 42 restricts the second tube portion 16 from moving in the positive X-direction beyond the maximum position, and moves the arm portion 50 from the holding position to the non-holding position when the second tube portion 16 reaches the maximum position. The second stopper portion 44 restricts the second tube portion 16 from moving in the negative X-direction beyond the minimum position, and moves the arm portion 50 from the non-holding position to the holding position when the second tube portion 16 reaches the minimum position.

[0049] According to the above configuration, the configuration of the lifting device 10 can be simplified compared to a configuration in which the member that restricts the second tubular portion 16 from moving in the positive X-direction beyond the longest position and the member that moves the arm portion 50 from the holding position to the non-holding position when the second tubular portion 16 reaches the longest position are separate members, and / or a configuration in which the member that restricts the second tubular portion 16 from moving in the negative X-direction beyond the shortest position and the member that moves the arm portion 50 from the non-holding position to the holding position when the second tubular portion 16 reaches the shortest position are separate members.

[0050] Each of the wire portions 12A to 12D includes a first tubular portion 14, a second tubular portion 16, and a lock portion 52.

[0051] When the multiple wire portions 12A-12D have a wire portion that does not include the first tubular portion 14, the second tubular portion 16, and the lock portion 52, the worker needs to adjust the wire portion so that it is not connected to a position closest to the center of gravity of the target object 100. That is, the worker needs to know the position of the center of gravity of the target object 100 in advance. With the above configuration, the worker does not need to know the position of the center of gravity of the target object 100. Therefore, the convenience for the user is improved.

[0052] Although specific examples of the technology disclosed in this specification have been described in detail above, these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and variations of the specific examples exemplified above. Modifications of the above embodiments are listed below.

[0053] (First Modification) The number of wire portions provided in the hoisting device 10 is not limited to four, and may be two, three, or five or more.

[0054] (Second Modification) In the above embodiment, the first tubular portion 14 is attached to the hook 200, and the second tubular portion 16 is attached to the object 100. In a modification, the first tubular portion 14 may be attached to the object 100, and the second tubular portion 16 may be attached to the hook 200.

[0055] (Third Modification) The locking portion 52 may be located only in the locking position.

[0056] (Fourth Modification) The locking portion 52 may be configured to be maintained in the locking position until the second tubular portion 16 moves from the maximum position to the minimum position.

[0057] (Fifth Modification) The position of the lock portion 52 may be adjustable by an operator.

[0058] (Sixth Modification) A member that restricts the second tube portion 16 from moving in the positive X direction beyond the maximum position and a member that moves the arm portion 50 from the holding position to the non-holding position when the second tube portion 16 reaches the maximum position may be separate members. Also, a member that restricts the second tube portion 16 from moving in the negative X direction beyond the shortest position and a member that moves the arm portion 50 from the non-holding position to the holding position when the second tube portion 16 reaches the shortest position may be separate members.

[0059] (Seventh Modification) One or more of the wire parts may include a “first columnar portion”, a “second columnar portion”, and a “locking portion”. When the number of wire parts is four, three or more of the wire parts may include a “first columnar portion”, a “second columnar portion”, and a “locking portion”.

[0060] (Eighth Modification) The "object" is not limited to building materials, frameworks, and panels, but may be a stretcher, etc.

[0061] The technical elements described in this specification or drawings have technical utility either alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the technologies illustrated in this specification or drawings can achieve multiple objectives simultaneously, and achieving one of these objectives is itself technically useful. [Explanation of symbols]

[0062] 10: hoisting device, 12A-12D: wire portion, 14: first tubular portion, 14A, 14B: end portion, 16: second tubular portion, 18: extension unit, 20: upper mounting portion, 22: lower mounting portion, 30: rail, 32: locking mechanism, 40: recess, 42: first stopper portion, 44: second stopper portion, 50: arm portion, 52: locking portion, 54: first arm portion, 56: second arm portion, 60: spring receiving portion, 62: first surface, 64: second surface, 66: first inclined surface, 67: connection surface, 68: flat surface, 70: second inclined surface, 100: object, 102: hook portion, 200: hook, A: central axis, S: compression spring

Claims

1. A hoisting device for suspending an object, comprising: The wire portion includes a plurality of wire portions, each of which has one end connected to a fulcrum portion and the other end connected to the object, A specific wire portion of the plurality of wire portions is A first columnar portion; a second columnar portion connected to the first columnar portion and movable in an axial direction of the specific wire portion relative to the first columnar portion, the second columnar portion being movable between a shortest position where the axial length of the specific wire portion is shortest and a longest position where the axial length of the specific wire portion is longest; a locking portion that restricts movement of the second columnar portion in a first direction from the shortest position toward the longest position and allows movement of the second columnar portion in a second direction opposite to the first direction; Equipped with The lock portion is movable between a locked position and an unlocked position, The lock portion is When the lever is positioned at the lock position, the second columnar portion is restricted from moving in the first direction and allowed to move in the second direction; When the lever is positioned at the unlocked position, the second columnar portion is allowed to move in the first direction and the second direction; When the second pillar portion is located at the shortest position, the second pillar portion is located at the unlocked position, When the second pillar portion is at the longest position, the second pillar portion is at the locked position; The lifting device is positioned in the unlocked position while the second post moves from the shortest position to the longest position.

2. The lock portion is The lifting device according to claim 1 , wherein the second post portion repeatedly moves between the locked position and the unlocked position while moving from the maximum length position to the minimum length position.

3. The specific wire portion further includes: a biasing member that biases the lock portion from the unlocked position to the locked position; a holding portion movable between a holding position in which the lock portion is held at the unlock position and a non-holding position in which the lock portion is not held; It is equipped with The holding portion is When the second columnar portion reaches the shortest position, the second columnar portion moves from the non-retaining position to the retaining position, The lifting device according to claim 1 , wherein the second post moves from the retaining position to the non-retaining position when the second post reaches the maximum position.

4. The hoisting device further includes a first stopper portion and a second stopper portion, the first stopper portion restricts the second columnar portion from moving in the first direction beyond the longest position, and moves the holding portion from the holding position to the non-holding position when the second columnar portion reaches the longest position, The suspension device of claim 3, wherein the second stopper portion restricts the second columnar portion from moving in the second direction beyond the shortest position, and moves the holding portion from the non-holding position to the holding position when the second columnar portion reaches the shortest position.

5. The suspension device according to claim 1 , wherein each of the plurality of wire portions includes the first post portion, the second post portion, and the lock portion.

6. 10. A method for suspending an object utilizing the suspension apparatus of claim 1, comprising: a hanging process of hanging the object using the hanging device in a state in which the plurality of wire portions are connected to the object; a proximity process in which the object is lowered and placed on the ground after the hanging process, thereby shortening the length of the specific wire portion and bringing the hanging support portion closer to the center of gravity of the object; A method comprising:

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