Hanging tool

Abstract

To provide a hanging tool which can hang a cargo and capable of smoothly carrying out transporting operations.SOLUTION: A hanging tool for gripping and hanging a cargo comprises: a pair of arms for performing the expansion / contraction of tips; a rotating shaft provided at the tips of the pair of arms and pivotally supported according to an expanding / contracting direction; a rod-shaped operation part for performing the expansion / contraction of the pair of arms or axially rotating the rotating shaft; and a gripping part provided at one end of the rotating shaft and abutted for gripping the cargo based on the expansion / contraction of the pair of arms. The rotating shaft is pivotally supported so that the thrust movement along an axial direction toward the cargo can be possible when the gripping part is abutted based on the expansion / contraction of the pair of arms by an operation of the operation part. The tip of the arm comprises: a biasing member for biasing the rotating shaft to a direction of the thrust movement toward the cargo; and a fixing part for performing a release from a state in which the axial rotation of the rotating shaft is disabled when the thrust movement against the biasing is carried out by the operation of the operation part.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a hoist for transporting cargo (work) handled during production assembly or transportation in the manufacturing field, and relates to a hoist that cooperates with a lifting device that simply moves the cargo up and down, or with a lifting device that moves the cargo up and down with little operating force based on the assistance of a motor when lifting or lowering the cargo. [Background technology]

[0002] 2. Description of the Related Art Conventionally, in factories where industrial products are assembled, there have been hoists used in loading and unloading devices that suspend and move up and down loads related to transport items such as heavy tools, work equipment, finished products, and semi-finished products.

[0003] The above-mentioned loading and unloading devices include a lift device that can be equipped with a lifting device that simply moves the load up and down using an electric motor, and, different from this, an electric balancer (hereinafter also referred to as a loading and unloading assistance device) that generates an assisting force so that a user can move heavy loads up and down to any height with a light operating force.

[0004] In addition, the above-mentioned loading assistance device, for example, detects loads using a load detector, monitors changes in the hanging state of the load using a lifting device (such as an AC servo motor) connected to a rotation angle detector, and controls the device to provide assistance in response to the changes in state, thereby creating a balanced state (a state in which weight balance is appropriately achieved based on the assistance of the motor) of the force (tension related to hanging) generated when hanging the load, making it possible to assist in moving the load smoothly by simply applying a small operating force to the load.

[0005] The cargo is secured by a sling (a device for suspending the cargo) using a lifting device attached to the end of a sling (a linear material such as a sling, link chain, or wire rope) that is pulled out from a designated lifting device.

[0006] Here, cargo objects come in a variety of shapes, so when hoisting (slinging) the cargo object by engaging the sling with the cargo object, it is necessary to ensure that the cargo object is stably suspended by adjusting its center of gravity so that it does not tilt. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Application Publication No. 9-124268 Summary of the Invention [Problem to be solved by the invention]

[0008] In Patent Document 1, in a sling having an arm that clamps a cargo, a clamping surface that bites into the surface of the cargo is provided at the end of the arm in order to securely hold the cargo.

[0009] Here, when there is a demand to clamp and suspend a box-shaped cargo object (such as a container) with a specified transport item stored inside with an arm, and then change the position of the cargo object (rotate it, etc.) to remove the stored transport item, there was room for improvement in the structure of the hoisting device that securely holds the cargo object.

[0010] In view of such problems, the present invention aims to provide a lifting device (or loading device) capable of suspending a load, capable of securely holding the load while changing the load's posture, thereby enabling smooth transport operations. [Means for solving the problem]

[0011] In order to achieve the above object, the lifting device (or loading device) of the present invention comprises: A sling that clamps and suspends cargo, The aforementioned slings are A pair of arms whose tip portions are expanded and contracted to hold the cargo; A rotation shaft is provided at the tip of the pair of arms and is supported in accordance with the direction of expansion and contraction; A rod-shaped operating unit that can expand and contract the pair of arms or rotate the rotation shaft; A gripping portion is provided at one end of the rotating shaft and comes into contact with the load to grip the load based on the expansion and contraction of the pair of arms; Equipped with The aforementioned rotating shaft (at least one of the pair of rotating shafts) When the gripping parts are brought into contact with each other based on the expansion and contraction of the pair of arms by the operation of the operating part, the support is configured to enable thrust movement along the axial direction toward the cargo, The tip of the arm (at least one of the pair of tip parts) is A biasing member biases the rotating shaft in a thrust direction (a force acting in the axial direction of the rotating shaft) toward the load; a fixing portion that releases the rotation shaft from a state in which the rotation shaft is prevented from rotating when a thrust movement against the biasing force is performed by operating the operating portion; The device is configured to have:

[0012] In order to achieve the above object, the lifting device (or the loading device) of the present invention comprises: The above-mentioned rotation axis is A first rotation shaft extending toward the side of the cargo at the tip of the first arm on one side; A second rotation shaft extending toward the other side of the second arm facing the side of the cargo object at the tip of the second arm on the other side; Equipped with The first rotation axis mentioned above is The operating part is attached to the other end opposite to the one end having the grip part facing the side of the cargo. The second rotation axis mentioned above is A shaft portion extending toward the other end opposite to one end having a gripping portion facing the side of the cargo, the shaft portion protruding in a direction intersecting the axial direction and having a cam portion attached thereto that accompanies the above-mentioned thrust movement, The aforementioned fixed part is It is configured such that from an initial state in which it engages with the cam portion to disable axial rotation of the second rotating shaft, it disengages from the cam portion based on thrust movement against the above-mentioned bias, thereby enabling the engagement to be released.

[0013] In order to achieve the above object, the lifting device (or the loading device) of the present invention comprises: The tip of the second arm described above is a retaining member is provided through a shaft portion between one end and the other end of the second rotating shaft to enable the above-mentioned thrust movement; The above-mentioned biasing member is wound around a shaft portion extending from the holding member toward one end side, and is capable of biasing the second rotating shaft by pressing the gripping portion. The aforementioned holding member is The holding member is configured to include the above-mentioned fixing portion that can engage with a cam portion provided on a shaft portion that extends from the holding member toward the other end side.

[0014] In order to achieve the above object, the lifting device (or the loading device) of the present invention comprises: The first arm described above is an unlocked position that allows axial rotation of the first rotation shaft based on an operation of the operation unit; a lock position in which the first rotating shaft is engaged with the operating unit to disable axial rotation of the first rotating shaft; An operating portion engagement mechanism is provided that enables the state of the locking member to be switched between the above states.

[0015] In order to achieve the above object, the lifting device (or the loading device) of the present invention comprises: The above-mentioned gripping portion is A distal end member is attached to one end of the rotating shaft facing a side surface of the load so as to move with the thrust movement described above; A first contact surface portion that is pivotally supported by the end member so as to have an axis in a direction intersecting the rotation axis and that can abut against the cargo while swinging based on the pivotal support; We strive to provide the following:

[0016] In order to achieve the above object, the lifting device (or the loading device) of the present invention comprises: The above-mentioned gripping portion is Further, a leading member is provided which extends upward and forward from the distal member, The preceding member is The above-mentioned first contact surface portion is provided with a second contact surface portion that contacts the upper edge of the cargo before contacting the side surface of the cargo. Effect of the Invention

[0017] According to the present invention, it is possible to provide a lifting device (or a loading device) that can lift and securely hold a load while changing the position of the load. [Brief description of the drawings]

[0018] [Figure 1] 1 is a diagram showing a front configuration of a hoisting tool according to the present embodiment and a lifting device that engages the hoisting tool. [Diagram 2] 1A is a front view of a load held by the sling according to the embodiment, and FIG. 1B is a front view of a load held by the sling according to the embodiment and rotated. [Diagram 3] 1A is a perspective view of a load being gripped by the hoisting tool according to the embodiment, and FIG. 1B is a perspective view of a load being gripped and rotated by the hoisting tool according to the embodiment. [Figure 4] 1A and 1B are enlarged views of a perspective configuration in which an object is gripped by a hoisting tool according to the present embodiment; [Diagram 5] 2 is a schematic diagram showing a gripping member in the suspender according to the embodiment. FIG. [Figure 6] 1 is a schematic diagram showing an operating member in a sling device according to the present embodiment. FIG. [Figure 7] FIG. 1 is a schematic diagram showing an elevator device according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] Hereinafter, a detailed description of the sling 1 according to this embodiment (also referred to as an embodiment of the present invention) will be given with reference to the drawings. Note that the supplementary contents in parentheses in this specification are examples according to the present invention, and the present invention is not limited to these supplementary contents.

[0020] Fig. 1 is a diagram showing a configuration of a hoist 1 as an example of this embodiment and a lifting device 3 that engages the hoist. Figs. 2 to 4 are diagrams showing a configuration in which a load 2a is gripped by the hoist 1 according to this embodiment and the load 2a is rotated while being gripped. Note that the Z direction shown in the upper right of Fig. 3 is the height direction, the Y direction is the front-rear direction, and the X direction is the left-right direction.

[0021] FIG. 1 shows a loading device comprising a hoist 1 equipped with a clamping mechanism 4a capable of clamping and suspending a loading object 2a (such as a box-shaped container capable of storing a specified transported item inside) placed on a floor surface G, and a lifting device 3 attached to and suspended from a specified lift facility (a beam of a specified height: not shown).

[0022] In addition, in the loading / unloading device of this embodiment, when in a stationary state, it generates a force that balances the weight of the sling 1 (suspended load) including the cargo object 2a, thereby maintaining balance, and during the hoisting or lowering operation, an electric motor extends or retracts the link chain 30 in response to even the slightest force applied by a person, making it an example of a loading / unloading assistance device that can drastically reduce the workload.

[0023] As an example, the lifting device 1 is connected (engaged) by a first hook 31 provided at the end of the hanging link chain 30 that is paid out from the lifting equipment 3, and can move up and down as the link chain 30 is extended and retracted by the lifting equipment 3.

[0024] The suspension device 1 in this embodiment is comprised of, as its main components, a horizontal support member 5, a pair of arms 6 (6a, 6b), a holding member 7 (7a, 7b), a rotating shaft 8 (8a, 8b), a gripping member 9 (9a, 9b), a mating member 10 (10a, 10b), a cam member 11, an operating member 12a, and an operating portion engagement mechanism 13a.

[0025] The above-mentioned horizontal support member 5 includes an engagement opening 4b at an upper portion thereof where an opening that enables engagement with the first hook 31 is provided, and a connecting member 5' for pivotally supporting the pair of arms 6. The pair of arms 6 includes a first arm 6a and a second arm 6b pivotally supported at an intersection 6' where the first arm 6a and the second arm 6b cross each other in an X shape.

[0026] The horizontal support member 5 and the pair of arms 6 are formed as a clamping mechanism 4a based on a pantograph structure in which the pair of arms 6 are pivotally supported on the connecting member 5' of the horizontal support member 5. This enables the distal ends of the pair of arms 6 to perform expansion and contraction operations for clamping the cargo 2a.

[0027] The tips of the first arm 6a and the second arm 6b are capable of expanding and contracting (rotating) within a limited angle range, with the intersecting point 6' as a fulcrum, between a contracted position (holding) in which they approach each other to clamp the load 2a, and an expanded position (non-holding) in which they spread out further than the contracted position to clamp the load 2a, enabling the load 2a to be suspended by clamping and grasping it when in the limited setting state set to the contracted position mentioned above.

[0028] The first arm 6a and the second arm 6b are provided at their respective tips with holding members 7 (7a, 7b). The holding members 7 (7a, 7b) include a base for supporting a predetermined shaft portion (an intermediate portion of the shaft) between one end (the side of the side surface 2b of the cargo 2a) of the rotating shaft 8 (8a, 8b) and the other end on the opposite side, through which the holding members 7 (7a, 7b) penetrate.

[0029] The rotating shaft 8 supported by the holding member 7 is held such that its axial direction extends toward the side surface 2b of the cargo 2a, and is held in accordance with the direction of the expanding and contracting motion described above. A gripping member 9 (9a, 9b) (described later) is provided on one end of the rotating shaft 8 that can face the side surface 2b of the cargo 2a.

[0030] 1, a first holding member 7a is provided at the tip of the first arm 6a (one side of the pair of arms 6), and a first rotating shaft 8a is supported by this first holding member 7a. Also, a second holding member 7b is provided at the tip of the second arm 6b (the other side of the pair of arms 6), and a second rotating shaft 8b is supported by this second holding member 7b.

[0031] A first fitting member 10a (fitting member 10) that serves as a distal member for fitting and fixing the first rotating shaft 8a is attached to one end of the first rotating shaft 8a in this embodiment. A rod-shaped operating member 12a is attached to the other end of the first rotating shaft 8a opposite to the one end (first gripping member 9a side).

[0032] The first engaging member 10a supports the first gripping member 9a, which has a first abutment surface portion 9c for abutting against the side surface 2b of the cargo 2a, so as to enable it to swing about an axis in a direction (Y direction) intersecting the axial direction (X direction) of the first rotating shaft 8a.

[0033] In addition, a first bent plate material 14a having an inverted L-shape is attached to the first engagement member 10a, which is a preceding member extending upward and forward, and has a second abutment surface portion 14c that abuts against the upper edge portion 2c of the cargo object 2a before the first abutment surface portion 9c abuts against the side surface 2b of the cargo object 2a.

[0034] 1, the side surface 2b of the cargo 2a in this embodiment is configured to have a slope (taper) that widens toward the bottom of the cargo 2a. The first contact surface 9c is configured based on an elastic material (such as flat rubber) that absorbs shock when contacting the side surface 2b of the cargo 2a and has a non-slip function when contacting.

[0035] From here, the first gripping member 9a in this embodiment first swings in accordance with the inclination of the side surface 2b and comes into contact with the upper edge portion 2c of the cargo object 2a as the second abutment surface portion 14c of the first bent plate material 14a is abutted against the upper edge portion 2c of the cargo object 2a so as to press it down.

[0036] In other words, the first abutment surface portion 9c is capable of swinging to abut against various types of side surface 2b of the cargo object 2a, including a vertical side surface 2b with no inclination, or a tapered side surface 2b with a gradient that narrows as it approaches the bottom of the cargo object 2a.

[0037] In addition, when the respective tips of the pair of arms 6 act to clamp the cargo 2a, the first gripping member 9a works in conjunction with the second gripping member 9b described below to clamp the cargo 2a (the first abutment surface portion 9c abuts against the side surface 2b), so that the clamping state can be maintained stably and reliably.

[0038] The above-mentioned operating member 12a is for allowing an operator (manual force) to clamp the cargo 2a with the respective tips of the pair of arms 6 and to rotate the first rotating shaft 8a. Specifically, it is a rod member that extends linearly at a predetermined interval along the linear arm vertical part 6a1 that extends substantially vertically from the tip of the first arm 6a, and has a handle part 12b at its upper end for the operator to grasp.

[0039] The arm vertical portion 6a1 described above is provided with an operation portion engagement mechanism 13a equipped with a movable locking member 13b that enables switching between a locking position in which the operation member 12a is held (fixed) in a posture extending in an approximately vertical direction and an unlocking position in which the locking is released.

[0040] When the locking member 13b is in the locked position, the operating member 12a enables an operator to grasp the handle portion 12b and move it in the direction of the arrow Y1 shown in Figure 3, thereby enabling the tip portions of the pair of arms 6 (6a, 6b) to expand and contract in order to clamp the cargo 2a.

[0041] At this time, the rotating shaft 8 (first rotating shaft 8a and / or second rotating shaft 8b) of this embodiment is configured to realize a displacement that performs a thrust movement (a force acting in the axial direction of the rotating shaft or a pressure) along the axial direction (X direction) in conjunction with the above-mentioned expansion and contraction operation.

[0042] In addition, when the locking member 13b is in the unlocked position, the operating member 12a enables the first rotating shaft 8a to rotate by an operator gripping the handle portion 12b and moving it in the direction of the arrow Y2 shown in Figure 3.

[0043] Furthermore, when the load 2a is held between the tips of the pair of arms 6 (6a, 6b), the second rotating shaft 8b can also rotate in conjunction with (synchronization with) the axial rotation of the first rotating shaft 8a. This causes the posture of the suspended load 2a (such as a box-shaped container) to change (rotate), allowing the desired transported item stored inside to be smoothly removed.

[0044] As shown in FIG. 1, a second engagement member 10b (engagement member 10) is attached to one end of the second rotating shaft 8b in this embodiment (on the side 2b of the cargo 2a), and the rotating shaft is fitted and fixed thereto. The second engagement member 10b serves as an end member that accompanies the thrust movement described above (moves together with the second rotating shaft 8b).

[0045] In addition, a cam member 11 is attached to the other end of the second rotating shaft 8b opposite to the one end (second gripping member 9b side) of the second rotating shaft 8b. The cam member 11 protrudes in a direction (Z direction) intersecting the axial direction (X direction) and moves together with the second rotating shaft 8b in the above-mentioned thrust movement.

[0046] In addition, in this embodiment, the second retaining member 7b is provided with a pair of fixing members 15 that sandwich the side surfaces of the cam member 11 between them at a through portion on the side surface through which the shaft portion extending toward the other end of the second rotating shaft 8b penetrates.

[0047] The above-mentioned fixing member 15 allows the cam member 11 provided on the other end of the second rotating shaft 8b to move in the axial direction (the X direction related to the above-mentioned thrust movement), but has a wall function that restricts rotation (disables axial rotation) by engaging to prevent the movement of the cam member 11 associated with the axial rotation (the direction of arrow Y2) of the second rotating shaft 8b.

[0048] The second rotating shaft 8b in this embodiment is biased in the direction opposite to the arrow Y3 shown in Fig. 4 by winding a spring member (biasing member) 16 described later. As the distal ends of the pair of arms 6 (6a, 6b) clamp the cargo 2a (expanding and contracting movement associated with gripping), the other end having the cam member 11 moves, and the cam member 11 is displaced in the direction of the arrow Y3 shown in Fig. 4 (disengagement from the fixed member 15).

[0049] From here, when the displacement proceeds in the direction of arrow Y3 shown in Figure 4, the cam member 11 moves from a position where it engages with the fixed member 15 to a position where it disengages from the fixed member 15 and does not engage with it, thereby achieving a state in which the above-mentioned wall function can be disabled, and the second rotating shaft 8b can rotate axially only when this state is reached.

[0050] Furthermore, since the first rotating shaft 8a is capable of axial rotation in conjunction with the axial rotation of the second rotating shaft 8b, the rotating shafts 8 (8a, 8b) are capable of axial rotation only when the cam member 11 is separated from the fixed member 15.

[0051] Similarly to the first engaging member 10a, the second engaging member 10b supports a second gripping member 9b having a first abutment surface portion 9c for abutting against the side surface 2b of the cargo 2a so as to enable it to swing about an axis in a direction (Y direction) intersecting the axial direction (X direction) of the second rotating shaft 8b.

[0052] Similarly to the first mating member 10a, the second mating member 10b is a preceding member that extends upward and forward, and has an inverted L-shaped second bent plate material 14b attached thereto, the second bent plate material 14b having a second abutment surface portion 14c that abuts against the upper edge portion 2c of the cargo object 2a before the first abutment surface portion 9c abuts against the side surface 2b of the cargo object 2a.

[0053] From this point, the second gripping member 9b of this embodiment, like the first gripping member 9a described above, first, the second abutment surface portion 14c of the second bent plate material 14b is abutted against the upper edge portion 2c of the cargo 2a so as to press it, and the first abutment surface portion 9c swings in accordance with the inclination of the side surface 2b and comes into contact.

[0054] In addition, when the respective tips of the pair of arms 6 act to clamp the cargo 2a, the second gripping member 9b works in conjunction with the above-mentioned first gripping member 9a to clamp the cargo 2a with the first abutment surface portion 9c (the first abutment surface portion 9c abuts against the side surface 2b), so that the clamping state can be maintained stably and reliably.

[0055] FIG. 5(A) is a schematic diagram with some parts omitted to show second gripping member 9b of suspender 1 according to this embodiment.

[0056] 5(B) to 5(C) are conceptual diagrams showing the state before and after the second gripping member 9b grips the cargo 2a, based on the cross section taken along line aa in FIG. 5(A).

[0057] As shown in FIG. 5(A), the second holding member 7b provided at the tip of the second arm 6b passes through a specific shaft portion (an intermediate portion of the shaft) between one end of the second rotating shaft 8b and the other end on the opposite side, providing a support that enables the above-mentioned thrust movement.

[0058] A spring member 16 is wound around one end of the second rotating shaft 8b, the shaft portion extending toward the X1 side (second gripping member 9b). A pair of fixing members 15 is attached to the second holding member 7b on the X2 side surface portion through which the other end of the second rotating shaft 8b penetrates.

[0059] 5(A), a second fitting member 10b is attached to one end of the second rotating shaft 8b by fitting and fixing the rotating shaft. The second gripping member 9b is supported by a swing shaft 9d (axis in the Y direction intersecting with the X direction) for swinging the first abutment surface portion 9c on the second fitting member 10b, and a second bent plate material 14b (second abutment surface portion 14c) is attached to the second fitting member 10b so as to extend upward and forward.

[0060] In addition, a cam member 11 is provided at the other end of the second rotating shaft 8b. The cam member 11 is fitted and fixed to a shaft portion extending from the second retaining member 7b toward the X2 side, protrudes in a direction intersecting the axial direction (Z direction), and is allowed to move in conjunction with the above-mentioned thrust movement.

[0061] As shown in FIG. 5(B), the second fitting member 10b fixed to one end of the second rotating shaft 8b is abutted so as to be pressed by the above-mentioned spring member 16, thereby enabling the second rotating shaft 8b to be biased in the direction opposite to the direction of the arrow Y3.

[0062] Based on the force of the spring member 16, the cam member 11 fixed to the other end of the second rotating shaft 8b is arranged in an initial position (initial state) where both sides of the cam member 11 can be engaged by being sandwiched between a pair of fixing members 15.

[0063] When the cam member 11 is disposed at the initial position, the above-mentioned fixed member 15 can be engaged to prevent the movement of the cam member 11 accompanying the axial rotation of the second rotating shaft 8b. Therefore, the fixed member 15 has a wall function that regulates the rotation of the second rotating shaft 8b and the cam member 11.

[0064] In addition, when an operator grasps the handle portion 12b and applies force in the direction of arrow Y1 to bring the gripping members (9a, 9b) into a gripping state in which they clamp the load 2a, thereby bringing the tips of the pair of arms 6 (6a, 6b) closer together and shrinking them (the first abutment surface portion 9c abuts against the side surface 2b), the fixing member 15 makes it possible to move the second rotating shaft 8b and the cam member 11 in the direction of arrow Y3 against the force of the spring member 16.

[0065] As shown in Figure 5 (C), when an operator operates the operating member 12a to clamp the cargo 2a with the respective ends (9a, 9b) of the pair of arms 6 (6a, 6b), the fixing member 15 is displaced from the initial position to a non-engaged position based on the movement of the second rotating shaft 8b and the cam member 11 in the direction of arrow Y3 against the force of the spring member 16, thereby enabling the above-mentioned wall function to be disabled (allowing the axial rotation of the rotating shaft 8).

[0066] FIG. 6 is a schematic diagram showing operation member 12a and operation portion engagement mechanism 13a in suspender 1 according to this embodiment.

[0067] As shown in FIG. 6, the operation portion engagement mechanism 13a provided on the arm vertical portion 6a1 of the first arm 6a includes a lock member 13b, a lock operation portion 13c, and a lock spring member 13d.

[0068] The locking member 13b is formed based on a mechanically movable structure that enables switching between a locking position in which the rod-shaped operating member 12a is held (fixed) in a posture extending in an approximately vertical direction and an unlocking position in which the locking is released.

[0069] The locking spring member 13d applies a biasing force to hold the locking member 13b in the locked position, and when an operator grasps the locking operation part 13c and moves it in the direction of the arrow Y4 against the biasing force, it is possible to switch the state from the locked position to the unlocked position.

[0070] When the operator stops gripping the lock operation portion 13c, the biasing force of the lock spring member 13d causes it to move in the opposite direction to the direction of the arrow Y4, making it possible to switch the state from the unlocked position to the locked position.

[0071] As shown in FIG. 6, the operating member 12a is supported so as to be able to rotate in the direction of the arrow Y2', and is biased by an operating part spring member (not shown) provided at the other end of the first rotating shaft 8a so as to align with the arm vertical part 6a1 and assume a vertical standing position with a predetermined gap therebetween.

[0072] That is, even when the lock member 13b is in the unlocked position, the operating member 12a is kept in a vertically standing position by the biasing force of the operating portion spring member (not shown).

[0073] Then, the worker operates the operating member 12a to clamp the cargo 2a with the respective ends (9a, 9b) of the pair of arms 6 (6a, 6b), and moves the second rotating shaft 8b and the cam member 11 in the direction of arrow Y3 against the force of the spring member 16 to separate them from the fixed member 15. At the same time, when the locking member 13b is moved to the unlocked position, the operating member 12a can be used to rotate in the direction of arrow Y2' against the force of the spring member for the operating section (not shown).

[0074] As a result, the opening of the suspended cargo 2a (such as a box-shaped container) is clamped by the tips of the pair of arms 6 (6a, 6b) and displaced (rotated) from an upward opening to a sideways opening, making it possible to smoothly remove the specified transported item stored inside.

[0075] FIG. 7 is a schematic diagram of the lifting device 3 associated with the hoist 1 of this embodiment, with some parts such as a cover omitted.

[0076] The lifting device 3 shown in Figure 7 has a removable cover (not shown) on a frame 37, and houses therein a control unit 32c, a motor unit 32b, a load sheave 33 (lifting operating unit 32a), a weight detection unit 34, etc.

[0077] In addition, the lifting equipment 3 in this embodiment is suspended from a specified lift facility (a beam of a building or tower, a movable block that can move horizontally along a rail for horizontal movement, a jib lift device, etc.) by a second hook (locking member) 39.

[0078] The control unit 32c includes a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and other storage devices and input / output devices. The control unit 32c enables control of the elevation and lowering of the hoist 1 based on the connection (locking) between the hoist 1 and a first hook (locking member) 31 provided at the end of the hanging of the link chain 30 wound around a load sheave 33 (described later).

[0079] The motor section 32b in the lifting equipment 3 has a reducer attached to a specified load side of an electric motor (drive source, motor) capable of raising and lowering the sling 1 that slings the cargo 2a, and together with this electric motor, forms the motor section (AC servo motor) 32b.

[0080] A brake is provided on the anti-load side of the motor section 32b to lock the motor shaft (output shaft 36) of the motor as required. In addition, the above-mentioned speed reducer is a "strain wave gear reducer" having a function of reducing the rotation speed of the motor to a predetermined speed in this embodiment.

[0081] The wave gear reducer comprises a wave generator having an elliptical outer periphery, a flexspline which is fitted onto the outside of the wave generator and is capable of elastic deformation such that its position changes as it is bent circumferentially by the rotation of the wave generator and which has a large number of external teeth formed on its outer periphery, and a circular spline which is located on the outer periphery of the flexspline and has internal teeth which engage with the external teeth of the flexspline.

[0082] The power of the above-mentioned strain wave gear reducer is extracted and transmitted to the output shaft 36, which is connected to the flexspline as a rotational output. In this embodiment, a reducer with minimal backlash (strain wave gear reducer) is used, which eliminates uncontrollable areas when frequently switching between forward and reverse rotation of the motor to perform up and down movement, thereby achieving a smooth operational feel.

[0083] The output shaft 36 is a motor rotating shaft that outputs increased power (torque) while the rotational speed is reduced by the reducer, and is connected to the load sheave 33, enabling the load sheave 33 to rotate continuously in both forward and reverse directions.

[0084] Link chain 30 is made up of oval rings, each of which is made up of a semicircular arc portion and a straight portion connected to the semicircular arc portion, that are alternately connected to each other, and one end of link chain 30 is fixed (fitted) and connected to a predetermined chain connection portion (pocket groove) provided on load sheave 33. The other end (unloaded side) of link chain 30 is stored in chain storage portion 38.

[0085] The load sheave 33 includes a rotating member that rotates by the transmission of power from the motor unit 32b serving as a drive source. The rotating member has a hollow cylindrical shape and is connected to an output shaft 36. The rotating member winds the link chain 30 around the load sheave 33, enabling the link chain 30 to be wound up and unwound.

[0086] In this embodiment, the position where link chain 30 is wound by load sheave 33 is approximately above where hoisting tool 1 is located, and is located close to the center of gravity of lifting and lowering operating part 32a. The end of the chain opposite to the end of the chain for paying out link chain 30 (first hook 31 side) is fitted into a pocket groove provided in a predetermined part of load sheave 33, enabling the load sheave 33 to be wound around the rotating member.

[0087] In this embodiment, a link chain 30 is used as a sling wound around the load sheave 33, but the present invention is not limited to this and may be a predetermined sling (string-like / linear member) such as a wire rope. For example, when a wire rope is used, a load sheave 33 consisting of a drum-shaped pulley is adopted, and one end of the wire rope is fixed to a fixing part provided on the pulley and wound around the trunk part (cylindrical surface).

[0088] In this embodiment, a position detector 35 for detecting the rotation angle position of the motor is connected to the motor section 32b on a predetermined counter-load side. This position detector 35 is a so-called absolute type rotary encoder, which optically detects the rotation angle position of the motor and outputs a position signal. This position detector 35 can detect the lifting position of the hoist 1 connected to the link chain 30 that is extended or retracted to a predetermined hanging length, and the load 2a held by the hoist 1.

[0089] The weight detection unit 34 of this embodiment is equipped with a strain gauge affixed to the strain body that elastically deforms so as to detect the weight of the cargo 2a and the sling 1 when they are suspended, which is the force transmitted from the link chain 30 wrapped around the load sheave 33, as a reaction force.

[0090] The strain gauge of this embodiment is incorporated into a Wheatstone bridge circuit that converts the strain generated in the strain body according to the weight (the force applied based on the suspension of the cargo 2a and the hoist 1) into an electric signal. The weight detection unit 34 described above detects the weight value applied to the load sheave 33 and outputs a weight signal.

[0091] The control unit 32c in this embodiment is disposed near the load sheave 33 in the lifting operation unit 32a. The control unit 32c is capable of controlling the motor unit 32b based on the position value from the position detection unit 35 and the weight value from the weight detection unit 34. Therefore, the control unit 32c and the associated electrical components such as the power supply are disposed inside a cover so that the control unit 32c can be used in places where it is exposed to powder or water droplets.

[0092] The position detector 35 in this embodiment is disposed on a predetermined anti-load side of the motor unit 32b, but is not limited thereto, and may be disposed on the output shaft 36, which is the output of the reducer, or on the load sheave 33, or may be disposed on both. Furthermore, the detection method is not limited to an optical type, and may be a magnetic type, a capacitance type, or the like.

[0093] Weight detection unit 34 may be a rotary type structure that detects torque from the twist of a motor rotating shaft provided between the reducer and load sheave 33, or a drum-shaped structure that detects the reaction force received by motor unit 32b, as long as it can detect the weight (the force applied to load sheave 33) described above. Furthermore, the detection method is not limited to the strain gauge type, and may be a capacitance type or other type.

[0094] The operating device 40 shown in Fig. 7 is a remote control device for remotely operating the lifting device 3. A balance button 41, a hold button 42, a raise button 43, and a lower button 44 are provided on the remote control body as operating means (each operating button), and a predetermined command can be output based on battery drive when a selective button operation (momentary switch input) is performed.

[0095] In this embodiment, communication with the circuit device (transmitter / receiver circuit) constituting the control unit 32c is possible based on the output from the above-mentioned operation device 40. Hereinafter, the role of each operation button provided on the operation device 40 will be described.

[0096] A predetermined first command is output based on an input by an operator pressing the balance button 41, and the control section 32c receives this command and starts to switch the lifting / lowering operating section 32a to the balance mode.

[0097] Specifically, the control unit 32c detects the force (weight based on the cargo 2a and the sling 1) applied to the load sheave 33 by the weight detection unit 34, performs calculations using the weight value output based on this detection, and assists in canceling the force applied to the load sheave 33 by controlling the motor unit 32b (reducing the load related to lifting and lowering / weight balance based on motor assist) (reducing the load based on the action of the lifting and lowering operating unit 32a).

[0098] Therefore, when the control unit 32c receives a predetermined first command based on the input of the worker pressing the balance button 41, immediately after performing the above-mentioned calculation, it executes the balance mode (normal balanced state) in which the user can transport the cargo 2a with a light operating force.

[0099] On the other hand, a predetermined second command is output based on the input of the operator pressing the hold button 42, and the control unit 32c receives this and performs calculations to control the motor unit 32b to hold the load sheave 33 at the current position, i.e., to keep the lifted position of the hoist 1 that slings and lifts the cargo 2a constant. Therefore, the control unit 32c controls the motor unit 32b from the time of output of this second command to execute (state transition) to the hold mode.

[0100] In either the balance mode or the holding mode, when the operator presses the up button 43 or the down button 44, a predetermined third or fourth command is output. Then, the control unit 32c performs calculations upon receiving the output of the third or fourth command, and compulsorily operates the load sheave 33 based on the control of the motor unit 32b, thereby enabling preferential execution of raising or lowering the sling 1 having the cargo 2a slinged thereon.

[0101] In this embodiment, the first hook 31 and the second hook 39 are not limited to the claw-shaped devices (locking configuration) described above, and locking members having other configurations that can be freely engaged and disengaged may be used as appropriate.

[0102] The lifting device 3 is not limited to a loading assist device (electric balancer) that generates an assisting force so that a user can move a heavy load 2a up and down to any height with a light operating force. In other words, it may be a loading device that has at least a function (electric motor) for lifting / lowering the load 2a.

[0103] While the present invention has been described above based on the preferred embodiment, the present invention is not limited to the above-described embodiment, and various modifications are possible without departing from the spirit and scope of the present invention. [Industrial Applicability]

[0104] As an example of the application of the present invention, it is possible to apply it to a loading device or a loading assistance device that suspends a loading object 2a and enables a predetermined movement. [Explanation of symbols]

[0105] 1: Hanging tool 2a: Cargo 2b: Side of cargo 3: Lifting equipment 4a: Clamping mechanism 4b: Locking opening 5: Horizontal support member 5': Connecting member 6: A pair of arms (first arm 6a, second arm 6b) 6': Intersection 7: Holding member (first holding member 7a, second holding member 7b) 8: Rotating shaft (first rotating shaft 8a, second rotating shaft 8b) 9: gripping member (first gripping member 9a, second gripping member 9b) 9c: First contact surface part 9d: Swing axis 10: Joint member (first joint member 10a, second joint member 10b) 11: Cam member (cam part) 12a: Operation member (operation part) 12b: Handle part 13a: Operation part engagement mechanism 13b: Locking member 13c: Locking operation part 13d: Locking spring member 14a: First bent plate 14b: Second bent plate 14c: Second contact surface part 15: Fixing material 16: Spring member (biasing member) 30: Link Chain 31: First hook 31 32a: Lifting actuator 32b: Motor section 32c: Control section 33: Road Sheave 34: Weight detection unit 35: Position detection unit 36: Output shaft 37: Frame 38: Chain storage section 39: 2nd hook 40: Operating device 41: Balance button 42: Retention button 43: Up button 44: Down button

Claims

1. A sling that clamps and suspends cargo, The sling is: A pair of arms whose tip portions are expanded and contracted to hold the cargo; A rotation shaft provided at the tip portion and supported in accordance with the direction of expansion and contraction; A rod-shaped operating unit that can expand and contract the arm or rotate the rotation shaft; A gripping portion provided at one end of the rotating shaft and abutting against the cargo based on the expansion and contraction of the arm; Equipped with The rotation shaft is When the gripping portion is brought into contact with the load based on the expansion and contraction of the arm by the operation of the operating portion, the support is configured to enable thrust movement along the axial direction toward the load, The tip of the arm is A biasing member biases the rotation shaft in the direction of the thrust movement toward the cargo; a fixing portion that releases the rotation shaft from a state in which axial rotation of the rotation shaft is disabled when the thrust movement against the biasing force is performed by operating the operating portion; and A sling characterized by having:

2. The rotation shaft is A first rotation shaft extending toward a side surface of the cargo at a tip end of the first arm on one side; A second rotation shaft extending toward the other side surface facing the side surface of the cargo at the tip end of the second arm on the other side; Equipped with The first rotation axis is The operation part is attached to the other end opposite to the one end having the grip part, The second rotation axis is a shaft portion extending toward the other end opposite to the one end having the grip portion, the shaft portion protruding in a direction intersecting the axial direction and having a cam portion attached thereto in association with the thrust movement; The fixing portion is A sling characterized in that, from an initial state in which the second rotating shaft engages with the cam portion to disable axial rotation, the sling disengages from the cam portion based on the thrust movement against the biasing force, thereby enabling the engagement to be released.

3. The tip of the second arm is a retaining member that passes through a shaft portion between the one end and the other end of the second rotating shaft and enables the thrust movement; a biasing member that is wound around a shaft portion extending from the holding member toward the one end side and that enables the biasing against the second rotating shaft based on pressing the grip portion, The holding member is 3. The sling according to claim 2, further comprising the fixing portion capable of engaging with the cam portion provided on a shaft portion extending from the holding member toward the other end.

4. The first arm is an unlocked position that allows the first rotation shaft to rotate based on an operation of the operation unit; a lock position in which the first rotating shaft is engaged with the operating portion to disable axial rotation of the first rotating shaft; 3. The sling according to claim 2, further comprising an operating portion engagement mechanism that enables switching of the state of the locking member between the above and the above.

5. The gripping portion is a distal member attached to one end of the rotating shaft so as to move with the thrust movement; A first contact surface portion that is pivotally supported by the end member so as to have an axis in a direction intersecting the rotation axis and that can contact the cargo while swinging based on the pivotal support; The sling according to claim 1 , further comprising:

6. The gripping portion is Further, a leading member is provided which extends upward and forward from the distal member, The preceding member is 6. The lifting device according to claim 5, further comprising a second abutment surface portion that abuts against an upper edge of the cargo object before the first abutment surface portion abuts against a side surface of the cargo object.

Images