Hoisting accessory device and method for hoisting object using hoisting accessory device

Abstract

To provide a technique that is able to reduce an inclination angle of an object to the ground.SOLUTION: A hoisting accessory device for hoisting an object includes a plurality of wire portions each of which has one end connected to a hoisting fulcrum portion and the other end connected to the object. A specific wire portion of the plurality of wire portions includes: a first cylindrical portion; a second cylindrical portion coupled to the first cylindrical portion and movable in an axial direction of the specific wire portion with respect to the first cylindrical portion, the second cylindrical portion being movable between a shortest position at which a length of the specific wire portion in the axial direction is shortest and a longest position at which the length of the specific wire portion is longest; and a lock portion that restricts the second cylindrical portion from moving in a first direction from the shortest position toward the longest position and that allows the second cylindrical portion to move in a second direction opposite to the first direction.SELECTED DRAWING: Figure 6

Description

[Technical Field]

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

[0002] Patent Document 1 discloses a suspending device for suspending an object. This suspending device 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. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-011122 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 portion of the object to which the wire portion located near the center of gravity is connected is tilted so that it is positioned lower than the portions to which the other wire portions are connected. In other words, the object is suspended by the hoisting device while being tilted relative to the ground. It is desirable to reduce the angle of inclination of the object relative to the ground.

[0005] This specification provides a technique that can reduce the tilt angle of an object relative 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 portions, each having one end connected to a fulcrum and the other end connected to the object. A specific wire portion of the plurality of wire portions may include a first pillar portion, a second pillar portion connected to the first pillar portion and movable in an axial direction of the specific wire portion relative to the first pillar portion, the second pillar 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, and a lock portion that restricts movement of the second pillar portion in a first direction from the shortest position toward the longest position and allows movement of the second pillar portion in a second direction opposite to the first direction.

[0007] Assume a situation in which an object is suspended using the above-described lifting device. In the initial state, the length of the specific wire section is at its maximum, and the lengths of the multiple wire sections are the same. When the object is viewed from above, the multiple wire sections are arranged at approximately equal intervals from the geometric center of the object. The specific wire section is connected to the wire section that is closest to the center of gravity of the object. In this case, the fulcrum of the lifting device is located above the geometric center of the object and away from the center of gravity of the object. In this situation, when the object is suspended using the lifting device, the portion to which the specific wire section is connected is located lower than the portions to which the other wire sections are connected. When the suspended object is lowered, the underside of the portion of the object to which the specific wire section is connected first touches the ground. When the object is further lowered, a load acts on the specific wire section in a direction that shortens the length of the specific wire section. In this case, the second columnar portion of the specific wire section moves in the second direction, thereby shortening the length of the specific wire section. 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 viewed from above. When the object is then suspended using the hoisting device, the inclination angle of the object relative to the ground becomes smaller than when the specific wire portion is at its maximum length. Therefore, the inclination angle of the object relative 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 restricts movement of the second columnar portion in the first direction and allows movement of the second columnar portion in the second direction, and when the locking portion is located at the unlocked position, the locking portion may allow movement of the second columnar portion in both the first and second directions, and may be located at the unlocked position when the second columnar portion is located at the shortest position, and may be located at the locked position when the second columnar portion is located at the longest position, and the second columnar portion may move from the shortest position to the longest position.

[0009] According to the above configuration, by positioning the second pillar portion at the shortest position, the lock portion is positioned at the unlocked position. This allows the second pillar portion to be moved in the first direction, thereby lengthening the length of the specific wire portion again. This allows the worker to repeatedly use the lifting device, improving worker convenience.

[0010] In a third aspect, in the 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, the movement of the second pillar portion in the first direction can be restricted every time the lock portion moves to the lock position, while the second pillar portion moves from the longest position to the shortest 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 locking portion from the unlocked position to the locked position, and a retaining portion that is movable between a retaining position that retains the locking portion at the unlocked position and a non-retaining position that does not retain the locking 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 may 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 pillar-shaped portion reaches the shortest position, the locking portion can be reliably positioned in the unlocked position, and when the second pillar-shaped portion reaches the longest position, the locking portion can be reliably positioned in the locked position.

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

[0017] When the multiple wire units include a wire unit that does not include a first columnar unit, a second columnar unit, and a lock unit, the worker must work so that the wire unit is not connected to a position closest to the center of gravity of the object. In other words, the worker must know the position of the center of gravity of the object in advance. With the above configuration, the worker does not need to know the position of the center of gravity of the object. Therefore, user convenience 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 suspension process for suspending the object using the suspension device while the plurality of wire portions are connected to the object, and a proximity process for lowering the object after the suspension 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 tilt angle of the object relative to the ground can be reduced. [Brief explanation 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. [Figure 2] FIG. 10 is a diagram showing a configuration in which the rail 30 is positioned at the shortest position. [Figure 3] FIG. 10 is a diagram showing a configuration in which the rail 30 is positioned at the longest position. [Figure 4] 5A and 5B are diagrams showing the operation of the rail 30 and the locking portion 52. [Figure 5] FIG. 3 is a view of the rail 30 as seen from the positive Z direction side. [Figure 6] 1A to 1C are diagrams showing the procedure for lifting an object 100 using the lifting device 10. DETAILED DESCRIPTION OF THE INVENTION

[0021] (Example) The lifting device 10 will be described with reference to Figures 1 to 5. The lifting device 10 in Figure 1 is a sling-type lifting device, and is used to suspend an object 100. As an example, the object 100 is a building material, a frame, 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 a detailed description of the wire portions 12B to 12D will be omitted.

[0023] The wire portion 12A will be described with reference to Figures 1 to 5. In the following, the direction of the central axis A of the wire portion 12A in Figure 2 is defined as the "X direction," the vertical direction in Figure 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 includes a first tubular portion 14, a second tubular portion 16, an extension unit 18 (see FIG. 2), and an upper attachment portion 20. The first tubular portion 14 and the second tubular portion 16 extend along the central axis A (see FIG. 2). The first tubular portion 14 and the second tubular portion 16 have a cylindrical shape. The upper attachment portion 20 is connected to an end portion 14A of the first tubular portion 14 on the negative X-direction side. The upper attachment portion 20 is attached to a hook 200 of a crane or the like. As shown in FIG. 2, a portion of the second tubular portion 16 is housed within the first tubular portion 14 and connected to the first tubular portion 14. As shown in FIG. 1, the second tubular portion 16 extends in the positive X-direction from an end portion 14B of the first tubular portion 14 on the positive X-direction side. A lower attachment portion 22 is provided at the end portion of the second tubular portion 16 on the positive X-direction side. The lower attachment part 22 is attached to a hook part 102A provided on the front left part of the upper surface of the object 100.

[0025] As shown in FIG. 2, the telescopic unit 18 is housed within the first tubular 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 tubular portion 16 is connected to the end of the rail 30 on the positive side in the X direction. The rail 30 is configured to be movable within the first tubular portion 14 along the X direction. As the rail 30 moves, the second tubular portion 16 moves, changing the length of the wire portion 12A. The rail 30 is provided with a plurality of recesses 40. The 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 Z-direction side. The first stopper portion 42 and the second stopper portion 44 protrude from the surface of the rail 30 on the positive Z-direction side. The first stopper portion 42 is provided at the end of the rail 30 on the negative X-direction side, and the second stopper portion 44 is provided at the end of the rail 30 on the positive X-direction side. 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 spacing between the first stopper portions 42 and the spacing between the second stopper portions 44 are greater 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 from the end of the first arm portion 54 on the positive side in the Z direction toward the negative side in the X direction. Although not shown in the figure, 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 recessed 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 and Z directions. The second surface 64 includes a first inclined surface 66, a connecting surface 67, a flat surface 68, and a second inclined surface 70. The second inclined surface 70, the flat surface 68, and the first inclined surface 66 are arranged in this order in the positive Z direction. The first inclined surface 66 and the second inclined surface 70 are inclined toward the negative X-direction as they extend in the negative Z direction. The flat surface 68 is a flat surface parallel to a plane including the Y and Z directions. 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 and Y directions. Although not shown, the size of the locking portion 52 in the Y direction is smaller than the left-right size of the recessed portion 40 of the rail 30.

[0030] (Operation of the rail 30 and locking 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 below. 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 at its longest 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 locking portion 52 are separated by the first stopper portion 42, and the locking portion 52 is not held by the arm portion 50. Therefore, the biasing force of the compression spring S causes the end of the locking portion 52 on the negative Z-direction side to be positioned within the recess 40 of the rail 30. Hereinafter, the position of the arm portion 50 when it is not holding the locking 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 positioned between two recesses 40 that are lined up 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 recessed portion 40. In this case, as shown in FIG. 4(C), the biasing force of the compression spring S causes the locking portion 52 to be positioned within the recessed portion 40 of the rail 30. Then, in response to a load acting on the rail 30 in the negative X direction, 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 in the state shown in FIG. 4(C), even if a load acting on the rail 30 in the positive X direction is applied, the rail 30 does not move in the positive X direction. This is because the first surface 62 of the locking portion 52 is flat, and the first surface 62 abuts against the surface of the recessed portion 40 on the negative X direction side, thereby restricting the movement of the rail 30 in the positive X direction. Hereinafter, 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 will be referred to as the "locked 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 locking portion 52. Because the first inclined surface 66 is inclined, the locking portion 52 moves in the positive Z direction as the arm portion 50 moves in the negative X direction. This positions the locking portion 52 on the positive Z direction side of the rail 30. That is, the locking portion 52 is held by the arm portion 50. In this state, the rail 30 can move in both the positive and negative X directions in the X direction between the longest and shortest positions. That is, the locking portion 52 allows the rail 30 to move in both the positive and negative X directions. Hereinafter, the position of the locking portion 52 in which the rail 30 is allowed to move in both the positive and negative X directions will be referred to as the “unlocked position.” Furthermore, 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 the position shown in FIG. 2, when the operator pulls the rail 30 in the positive X direction, 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 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 reaches its maximum, the lock portion 52 of this embodiment repeatedly moves between the locked position (see FIGS. 4A and 4C) and the unlocked position (see FIG. 4B) until the rail 30 moves from the maximum length position to the shortest length position. Then, each time the lock portion 52 is placed in the locked position, movement of the arm portion 50 in the positive X direction is restricted.

[0036] (Method for suspending an object 100 using a suspension device 10) Referring 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. For clarity, FIG. 6 simplifies the configuration of the wire portions 12A-12D, and omits the hooks 102A-102D and the hook 200 of the object 100. The object 100 in FIG. 6 is an object whose center of gravity is located at the front left. In the initial state shown in FIG. 6(A), the lengths of the wire portions 12A-12D are at their maximum. That is, the rails 30 of the wire portions 12A-12D are located at their longest positions (see FIG. 2). Furthermore, when the hoisting device 10 and the object 100 are viewed from above, the wire portions 12A-12D are connected to the hooks 102A-102D (see FIG. 1) of the object 100 at substantially equal intervals from the geometric center of the object 100. In this state, when the lifting device 10 and the object 100 are viewed from above, the fulcrum of the lifting 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), the center of gravity of the object 100 is located at the front left, so the object 100 is tilted so that the front left part is located lower than the rear right part.

[0038] Next, as shown in FIG. 6(C), the object 100 is lowered. Because the object 100 is inclined so that the left front portion is positioned lower than the right rear portion, the left front portion of the object 100 hits the ground first. As the object 100 is further lowered, a load acts on the rail 30 of the wire portion 12A connected to the left front portion of the object 100 in a direction that moves the rail 30 in the negative X direction. This causes the rail 30 to move in the negative X direction, shortening the length of the wire portion 12A. 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 from the initial state. In other words, the fulcrum portion approaches above the center of gravity of the object 100 (approach process). When the object 100 is suspended using the hoisting device 10 in this state, the object 100 becomes approximately parallel to the ground.

[0039] If the object 100 is still inclined with respect to the ground even after the above procedure is performed, the hanging process and the approaching process are repeated, whereby the wire portions 12A to 12D contract, and the object 100 lifted by the lifting device 10 becomes substantially parallel to the ground.

[0040] As described above, the sling 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 a 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 tubular portion 14 (an example of a "first columnar portion"), a second tubular portion 16 connected to the first tubular portion 14 and movable in the axial direction of the wire portion 12A relative to the first tubular portion 14, the second tubular portion 16 being movable between a shortest position where the length of the wire portion 12A is shortest along the central axis A of the wire portion 12A (an example of an "axial direction") and a longest position where the length of the wire portion 12A is longest, and a locking portion 52 that restricts movement of the second tubular portion 16 in the positive X direction (an example of a "first direction") from the shortest position toward the longest position, while allowing movement of the second tubular portion 16 in the negative X direction (an example of a "second direction").

[0041] With the above configuration, as shown in FIG. 6, when object 100 is suspended using hoisting device 10, the portion to which wire portion 12A is connected is located lower than the portions to which other wire portions 12B to 12D are connected. When object 100 suspended by hoisting device 10 is lowered, the underside of object 100 at the portion to which wire portion 12A is connected first touches the ground. When object 100 is further lowered, a load acts on wire portion 12A in a direction that shortens the length of wire portion 12A. In this case, second tubular portion 16 of wire portion 12A moves in the negative X-direction. This shortens the length of wire portion 12A. As wire portion 12A shortens, the position of the center of gravity of object 100 and the position of the fulcrum of hoisting device 10 become closer when viewed from above. Thereafter, when the object 100 is suspended using the hoisting device 10, the inclination angle of the 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 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. The locking portion 52 is in the unlocked position when the second tube portion 16 is in the shortest position, and is in the locked position when the second tube portion 16 is in the longest position. The locking portion 52 is in the unlocked position while the second tube portion 16 is moving 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. This allows the second tubular portion 16 to be moved in the positive X direction, thereby lengthening the length of the wire portion 12A again. This allows the worker to repeatedly use the lifting device 10, improving worker convenience.

[0044] Furthermore, the locking portion 52 repeatedly moves between the locked position and the unlocked position while the second cylindrical portion 16 moves from the longest position to the shortest position.

[0045] According to the above configuration, the second cylindrical portion 16 can be restricted from moving in the positive X direction every time the locking portion moves to the locking position until the second cylindrical portion 16 moves from the longest position to the shortest position.

[0046] The wire portion 12A further includes a compression spring S (an example of a "biasing member") that biases the locking 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 locking portion 52 in the unlocked position and a non-holding position that does not hold the locking 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 locking portion 52 can be reliably positioned in the unlocked position, and when the second tubular portion 16 reaches the longest position, the locking portion 52 can be reliably positioned in the locked position.

[0048] The lifting device 10 further includes a first stopper portion 42 and a second stopper portion 44. The first stopper portion 42 prevents the second tubular portion 16 from moving in the positive X direction beyond the longest position, and moves the arm portion 50 from the holding position to the non-holding position when the second tubular portion 16 reaches the longest position. The second stopper portion 44 prevents the second tubular portion 16 from moving in the negative X direction beyond the shortest position, and moves the arm portion 50 from the non-holding position to the holding position when the second tubular portion 16 reaches the shortest 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 plurality of wire portions 12A to 12D includes a first cylindrical portion 14, a second cylindrical portion 16, and a lock portion 52.

[0051] When the plurality of wire portions 12A to 12D include a wire portion that does not include the first tubular portion 14, the second tubular portion 16, and the lock portion 52, the worker must adjust the wire portion so that it is not connected to a position closest to the center of gravity of the target object 100. In other words, the worker must 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, 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 examples are listed below.

[0053] (First Modification) The number of wire portions provided in the sling device 10 is not limited to four, but 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 positioned 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 locking portion 52 may be adjustable by an operator.

[0058] (Sixth Modification) The member that restricts the second cylindrical 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 cylindrical portion 16 reaches the longest position may be separate members. Also, the member that restricts the second cylindrical 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 cylindrical portion 16 reaches the shortest position may be separate members.

[0059] (Seventh Modification) It is sufficient that one or more of the wire portions include a “first columnar portion,” a “second columnar portion,” and a “lock portion.” When the number of wire portions is four, it is preferable that three or more wire portions include a “first columnar portion,” a “second columnar portion,” and a “lock portion.”

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

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

[0062] 10: Lifting device, 12A to 12D: Wire portion, 14: First tubular portion, 14A, 14B: End portions, 16: Second tubular portion, 18: Telescopic 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, a plurality of wire portions, each of which has one end connected to a suspension support portion and the other end connected to the object; A specific wire portion among the plurality of wire portions is A first columnar portion; a second columnar portion connected to the first columnar portion and movable in the 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 pillar portion in a first direction from the shortest position toward the longest position and allows movement of the second pillar portion in a second direction opposite to the first direction; A lifting device comprising:

2. The locking portion is movable between a locked position and an unlocked position, The locking portion is When the lever is positioned at the lock position, the second pillar 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 pillar 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 lock position; The lifting device of claim 1 , wherein the second post is in the unlocked position while moving from the shortest position to the longest position.

3. The locking portion is The lifting device according to claim 2 , wherein the second pillar repeatedly moves between the locked position and the unlocked position while moving from the longest position to the shortest position.

4. The specific wire portion further includes: a biasing member that biases the locking portion from the unlocked position to the locked position; a holding portion movable between a holding position that holds the lock portion at the unlock position and a non-holding position that does not hold the lock portion; It is equipped with The holding portion is When the second columnar portion reaches the shortest position, it moves from the non-retaining position to the retaining position, The lifting device according to claim 2 , wherein the second post moves from the retaining position to the non-retaining position when the second post reaches the longest position.

5. The lifting 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; 5. The lifting device of claim 4, wherein the second stopper portion restricts the second pillar 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 pillar portion reaches the shortest position.

6. 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.

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

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