Hoisting tool

Abstract

To provide an easy-to-handle hoisting tool.SOLUTION: A hoisting tool includes a chain connected to an object to be hoisted, and a hoisting tool main body that suspends the object via the chain. The hoisting tool main body includes an exterior part including a hook part that is hooked onto a hoisting machine, a wheel that is rotatably attached to the exterior part and has a fitting part formed on an outer circumferential side face to fit with the chain, a locking mechanism that can restrict the rotation of the wheel, and a brake mechanism that brakes the rotation of the wheel. The wheel is vertically movable relative to the exterior part, and the locking mechanism includes biasing means that biases the wheel upward while allowing the wheel to move vertically, and a pair of opposing meshing parts that come into contact with and separate from each other by changing the position of the wheel in the vertical direction. One meshing part is fixed to the wheel, and the other meshing part is fixed to the exterior part, and the brake mechanism includes a brake shoe that presses against the wheel, and adjustment means that adjusts the pressing force of the brake shoe against the wheel.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a lifting tool used for lifting heavy objects, etc. [Background technology]

[0002] As an example of such a hoisting device, as disclosed in Patent Document 1, a hoisting pulley is known that includes a rope connected to an object to be hoisted and a main body that suspends the object via the rope.

[0003] The main body comprises a pair of snatch plates arranged opposite each other, a hoisting hardware attached between the pair of snatch plates and hung on a lifting machine, a rope sheave around which a rope is wound and attached rotatably between the pair of snatch plates, and a stopping means for stopping the rotation of the rope sheave.

[0004] A single sheave shaft is inserted through the rope sheave and the pair of snatch plates. The sheave shaft is configured so that its position can be changed in the vertical direction relative to the snatch plates, and is placed on a spring attached to the snatch plates so that it can expand and contract in the vertical direction.

[0005] Therefore, unless a load greater than the spring force is applied to the rope sheave, the rope sheave is positioned toward the upper side of the snatch plate, and when a load greater than the spring force is applied, the rope sheave's position relative to the snatch plate is changed from the upper side to the lower side.

[0006] The stopping means has a corrugated inner waveform teeth formed on the inner surface of a hollow (annular) rope sheave, and a sector-shaped body fixed to the inside of the snatch plate facing the inner waveform teeth from below, and outer waveform teeth that mesh with the inner waveform teeth are formed on the upper surface of the sector-shaped body.

[0007] When using the hoist pulley of the above configuration to hoist an object, the rope is wound around the outer periphery of the rope sheave, both ends are connected to the object, and the hoist is hung on a hoist.

[0008] In this state, the lifting pulley is lifted by the lifting machine, but if the center of gravity of the object to be lifted deviates from the lifting center line (an imaginary line extending vertically through the position where the main body is lifted) when the lifting machine begins to lift the main body, the wheel will rotate and the main body will move toward the center of gravity of the object to be lifted, and the position of the main body will be automatically adjusted so that the center of gravity of the object to be lifted and the lifting center line overlap.

[0009] When the load is lifted from the ground, the rope sheave is subjected to a load greater than the spring force, so the position of the rope sheave relative to the snatch plate changes from the upper side to the lower side. As a result, the inner corrugated teeth and the outer corrugated teeth mesh with each other, and the rope sheave is fixed to the snatch plate so that it does not rotate. This makes it possible to lift the load while preventing the position of the main body relative to the load from changing. [Prior art documents] [Patent documents]

[0010] [Patent Document 1] Special Publication No. 49-1823 Summary of the Invention [Problem to be solved by the invention]

[0011] However, in a hoist pulley of the above configuration, the rope sheave is allowed to rotate freely until the internal corrugated teeth and external corrugated teeth mesh and the rope sheave is fixed to the snatch plate to prevent it from rotating. This means that the rope sheave can rotate at unintended times, making it difficult to handle.

[0012] In view of the above circumstances, an object of the present invention is to provide a hanging device that is easy to handle. [Means for solving the problem]

[0013] The sling of the present invention comprises: A long chain that is connected to an object to be lifted; A hoisting tool main body that suspends an object to be hoisted via the chain, the hoisting device main body has an exterior part including a hook part to be hung on a hoisting machine, a wheel rotatably attached to the exterior part, the wheel having an engagement part formed on an outer circumferential side surface to engage with the chain, a locking mechanism switchable between a state in which the rotation of the wheel is restricted and a state in which the restriction on the rotation of the wheel is released, and a brake mechanism that brakes the rotation of the wheel; The wheel is movable up and down relative to the exterior part, the locking mechanism includes a biasing means for biasing the wheel upward while allowing the wheel to move up and down, and a pair of meshing portions disposed opposite each other in the vertical direction, the pair of meshing portions moving toward and away from each other as the wheel is moved up and down relative to the exterior portion, One of the pair of meshing portions is fixed to the wheel, The other of the pair of meshing portions is fixed to the exterior portion, The brake mechanism includes a brake shoe that presses against the wheel, and an adjustment means that adjusts the pressing force of the brake shoe against the wheel.

[0014] To hoist an object to be hoisted using the hoisting tool having the above-described configuration, a chain having both ends connected to the object to be hoisted is hung on the wheel, and the hung portion of the exterior part is hung on a hoisting machine.

[0015] While the wheel is not subjected to a load greater than the biasing force of the biasing means, the wheel can rotate if an external force exceeding the braking force of the brake mechanism is applied, so that the position of the sling body can be changed along the chain.

[0016] When the exterior is lifted by the hoist and a load greater than the biasing force of the biasing means is applied to the wheel, the wheel tries to remain in place while the exterior continues to be lifted, causing the position of the wheel relative to the exterior to change from the upper side to the lower side. As a result, the meshing portion fixed to the wheel and the meshing portion fixed to the exterior mesh with each other, restricting the rotation of the wheel.

[0017] Furthermore, in the suspension device configured as described above, the rotation of the wheel can be braked by increasing the pressing force of the brake shoe against the wheel using the adjustment means, thereby preventing the wheel from rotating at an unintended time, thereby improving ease of use.

[0018] In the sling of the present invention, The wheel has an outer circumferential side surface formed with a fitting groove into which the chain fits and a brake abutment portion with which the brake shoe abuts, The brake contact portion may be formed at a bottom portion of the fitting groove.

[0019] With the hanging device of the above configuration, the fitting groove into which the chain fits and the brake abutment portion against which the brake shoe abuts are formed integrally, thereby enabling the device to perform the function of making it difficult for the wheel to rotate with a simple structure.

[0020] In the sling of the present invention, The adjustment means has a lever exposed to the outside of the exterior body, The lever may be configured so that its position changes in response to a pressing force of the brake shoe against the wheel.

[0021] With the sling configured as described above, it is possible to check the strength of the braking force that the brake mechanism is applying to the rotational motion of the wheel by looking at the direction of the lever, thereby improving ease of use.

[0022] In the sling of the present invention, The hoist body has a switching restriction means for restricting switching of the locking mechanism to a state in which rotation of the wheel is restricted, The switching control means may be provided on the exterior portion and configured to directly or indirectly embrace the wheel from below when the exterior portion is tilted toward one end or the other end of the chain.

[0023] In the lifting device of the above configuration, when the exterior part is pulled diagonally upward by the hoisting machine (when the exterior part is so-called being pulled diagonally), the wheel is directly or indirectly embraced from below by the switching control means, and the wheel cannot be repositioned downward relative to the exterior part.

[0024] As a result, the locking mechanism cannot be switched to a state that restricts wheel rotation, so by leaving the wheels in a rotatable state, it is possible to prevent the object to be lifted from being lifted while being subjected to a lateral force, thereby making it possible to lift the object safely. Effect of the Invention

[0025] As described above, the suspension device of the present invention has the excellent effect of being easy to handle. [Brief description of the drawings]

[0026] [Figure 1] FIG. 1 is an external view of a sling according to one embodiment of the present invention. [Diagram 2] FIG. 2 is a front view of the suspender main body of the suspender according to the embodiment. [Diagram 3] FIG. 3 is a front view of the portion of the sling body of the sling according to the embodiment excluding the exterior part. [Figure 4] FIG. 4 is a partial cross-sectional view of FIG. [Diagram 5]FIG. 5 is an explanatory diagram of a wheel of the sling according to the embodiment, where (a) is a view taken along the line V in FIG. 4 and is a cross-sectional view taken along the line BB in (a). [Figure 6] FIG. 6 is an explanatory diagram of the operation of restricting the rotation of the wheel by the locking mechanism in the sling device according to the embodiment, where (a) is an explanatory diagram of the state before the rotation of the wheel is restricted by the locking mechanism, and (b) is an explanatory diagram of the state after the rotation of the wheel is restricted by the locking mechanism. [Figure 7] FIG. 7 is an explanatory diagram of the operation of restricting the operation of the locking mechanism by the switching restriction means of the hanging device according to the same embodiment, where (a) is an explanatory diagram of the state before the operation of the locking mechanism is restricted by the switching restriction means, and (b) is an explanatory diagram of the state after the operation of the locking mechanism is restricted by the switching restriction means. [Figure 8] FIG. 8 is a perspective view of a rotation shaft of the suspender according to the same embodiment. [Figure 9] FIG. 9 is an explanatory diagram of the suspension tool according to the embodiment in use. [Figure 10] FIG. 10 is an explanatory diagram of the suspension tool according to the embodiment in use. [Figure 11] FIG. 11 is an explanatory diagram of a sling device according to another embodiment of the present invention. [Figure 12] FIG. 12 is an explanatory diagram of the locking mechanism of the sling according to the embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0027] Hereinafter, a hanging device according to one embodiment of the present invention will be described with reference to the accompanying drawings, in which the up-down and left-right directions are based on the state shown in Figs.

[0028] As shown in Figure 1, the hoisting device 1 of this embodiment comprises a long chain 2, both ends of which can be connected to an object to be hoisted (e.g., a heavy object), and a hoisting device main body 3 that suspends the object to be hoisted via the chain 2.

[0029] Both ends of the chain 2 in the longitudinal direction are provided with connecting means 20 such as couplings, hooks, shackles, etc., and these connecting means 20 connect both ends of the chain 2 to an object to be suspended.

[0030] The chain 2 of this embodiment is formed by connecting a plurality of rings 200. Each ring 200 is elliptical and annular, and has a pair of parallel straight portions 200a and an arc portion 200b connecting an end of one adjacent straight portion 200a to an end of the other straight portion 200a.

[0031] As shown in FIG. 2, the hoisting device main body 3 has an exterior part 30 including a hanging part 300 to be hung on a hoisting machine (e.g., a crane, etc.), a wheel 31 to which a chain 2 is hung on its outer peripheral side and which is rotatably attached to the exterior part 30, a locking mechanism 32 that can be switched between a state in which the rotation of the wheel 31 is restricted (locked state) and a state in which the restriction on the rotation of the wheel 31 is released (unlocked state), a brake mechanism 33 that brakes the rotation of the wheel 31, and a switching restriction means 34 that prevents the locking mechanism 32 from switching from the locked state to the unlocked state.

[0032] The exterior portion 30 of this embodiment has a pair of plates 301 arranged facing each other with a gap therebetween, and a roller shaft 302 arranged between the pair of plates 301.

[0033] One axial end of roller shaft 302 is attached to one plate 301, and the other axial end is attached to the other plate 301. In the suspender 1 of this embodiment, roller shaft 302 constitutes suspended portion 300.

[0034] The wheel 31 is disposed between a pair of plates 301. A rotation shaft P1 is inserted through a through hole in the center of the wheel 31 and through each of the pair of plates 301 (specifically, shaft insertion portions 320, described later, formed on each of the pair of plates 301). This allows the wheel 31 to be rotatably attached to the exterior portion 30.

[0035] As shown in FIG. 4, the outer peripheral side surface of the wheel 31 in this embodiment is formed with a fitting groove 310 into which the chain 2 fits, and a brake abutment portion 311 against which a brake shoe 35 (described later) abuts.

[0036] As shown in FIG. 5( a ), the fitting groove 310 is formed so as to open on the outer circumferential side surface of the wheel 31 , and is formed so as to continue around the entire periphery of the outer circumferential side surface of the wheel 31 .

[0037] The fitting groove 310 in this embodiment has a deep groove portion 310a formed on the outer peripheral side surface of the wheel 31, the deep groove portion 310a being formed so as to be continuous around the entire circumference of the outer peripheral side surface of the wheel 31, and a plurality of shallow groove portions 310b formed on the outer peripheral side surface of the wheel 31, the plurality of shallow groove portions 310b being formed so as to be aligned along the circumferential direction of the wheel 31.

[0038] The depth of each of the shallow groove portions 310b is shallower than the deep groove portions 310a (see FIG. 5(b)).

[0039] Each of the shallow groove portions 310b has a pair of shallow groove forming portions 310c formed to be aligned in the thickness direction of the wheel 31 with the deep groove portion 310a interposed therebetween.

[0040] One of the pair of shallow groove forming portions 310c is continuous with the deep groove portion 310a on one side in the thickness direction of the wheel 31 (one side in the groove width direction of the deep groove portion 310a), and the other of the pair of shallow groove forming portions 310c is continuous with the deep groove portion 310a on the other side in the thickness direction of the wheel 31 (the other side in the groove width direction of the deep groove portion 310a).

[0041] The shallow groove portions 310b are formed so as to be arranged at intervals in the circumferential direction of the wheel 31.

[0042] 5(b), the ring 200 is configured to enter the shallow groove portion 310b in a horizontal orientation (horizontal to the outer peripheral side surface of the wheel 31), and the ring 200 is configured to enter the deep groove portion 310a in a vertical orientation (vertical to the outer peripheral side surface of the wheel 31). Therefore, when the chain 2 is hung on the wheel 31, the shallow groove portion 310b and the horizontally oriented ring 200 are engaged with each other in the circumferential direction of the wheel 31.

[0043] The brake contact portion 311 is configured by a deep groove portion 310a. That is, the deep groove portion 310a serves as a portion into which the vertically oriented ring 200 is inserted and a portion into which the brake mechanism 33 (the brake shoe 330 described later) is inserted.

[0044] The bottom surface of the brake abutment portion 311 is formed so that its cross section in the radial direction is linear, and a brake shoe 330 (described later) abuts against this bottom surface. The chain 2 is hung on the upper side of the wheel 31, but the lower side of the wheel 31 is left open, so that the brake shoe 330 can abut against the bottom surface of the brake abutment portion 311 from the lower side of the wheel 31.

[0045] As shown in FIG. 3, the locking mechanism 32 has an axis insertion portion 320 formed in the exterior portion 30, through which the rotation axis P1 inserted in the wheel 31 is inserted while allowing it to move up and down, a biasing means 321 that biases the wheel 31 upward while allowing the wheel 31 to move up and down, and a pair of meshing portions 322, 323 that are arranged opposite each other in the vertical direction and that move toward and away from each other as the position of the wheel 31 relative to the exterior portion 30 is changed in the vertical direction.

[0046] The shaft insertion portion 320 is configured as a long hole (long hole extending in the up-down direction) formed in the exterior portion 30. Therefore, while the rotation shaft P1 is allowed to move in the up-down direction when inserted into the shaft insertion portion 320, the movement of the rotation shaft P1 in the left-right direction is restricted. Similarly, while the wheel 31 through which the rotation shaft P1 is inserted is allowed to move in the up-down direction when the rotation shaft P1 is inserted into the shaft insertion portion 320, the movement of the wheel 31 through which the rotation shaft P1 is inserted is also allowed to move in the up-down direction, but the movement of the wheel 31 in the left-right direction is restricted.

[0047] The biasing means 321 receives from below the rotating shaft P1 in a state in which it is inserted into the shaft insertion portion 320. In addition, the biasing means 321 biases the rotating shaft P1 upward in a state in which the rotating shaft P1 is permitted to move up and down in the shaft insertion portion 320, so that the wheel 31 in which the rotating shaft P1 is inserted is also subjected to an upward biasing force in a state in which the wheel 31 is permitted to move up and down.

[0048] Therefore, when a load greater than the biasing force of the biasing means 321 is applied to the wheel 31 while the exterior part 30 is being lifted by a hoisting machine, the wheel 31 changes its position relative to the exterior part 30 downward, and when the load goes from exceeding the biasing force of the biasing means 321 to falling below the force, the wheel 31 changes its position relative to the exterior part 30 upward (returns).

[0049] The biasing force of the biasing means 321 is set to a degree that keeps the pair of interlocking portions 322, 323 from interlocking with each other until the object to be suspended leaves the ground surface as the hoisting tool main body 3 is hoisted.

[0050] The biasing means 321 may be formed of an elastic body capable of elastic deformation, such as a torsion spring. In this case, the biasing means 321 includes a spiral mounting portion 321a through which a fixing shaft is inserted, and a pair of extending portions 321b extending from the mounting portion 321a, and one of the extending portions 321b pushes up the rotation axis P1.

[0051] Of the pair of meshing portions 322, 323, one of the meshing portions 322 is a wheel side meshing portion 322 that is attached to the wheel 31 by bolting, and the other of the pair of meshing portions 323 is an exterior side meshing portion 323 that is attached to the exterior portion 30 and is immovable up and down relative to the exterior portion 30.

[0052] The wheel side meshing portion 322 and the exterior side meshing portion 323 are formed with teeth 3220, 3230 which mesh with each other.

[0053] The wheel side meshing portion 322 is formed in a disk shape, and the teeth portion 3220 are formed on the entire outer periphery of the wheel side meshing portion 322. In addition, the wheel side meshing portion 322 may be fixed to the front or back surface of the wheel 31.

[0054] Furthermore, since the wheel side meshing portion 322 is concentric with the wheel 31, when the position of the wheel 31 relative to the exterior part 30 has not been changed downward by the biasing force of the biasing means 321, the distance between the tooth portion 3220 of the wheel side meshing portion 322 and the tooth portion 3230 of the exterior side tooth portion 323 remains constant even when the wheel 31 rotates.

[0055] The exterior side meshing portion 323 is positioned in a position aligned below the wheel side meshing portion 322 and is fixed to the exterior portion 30 (in this embodiment, the inner surface of the plate 301) with the tooth portion 3230 facing the tooth portion 3220 of the wheel side meshing portion 322.

[0056] Here, the positional relationship between the wheel side meshing portion 322 and the exterior side meshing portion 323 will be described. As shown in Fig. 6(a), the exterior side meshing portion 323 is disposed inside the wheel side meshing portion 322. Furthermore, when the wheel 31 is not subjected to a load larger than the biasing force of the biasing means 321, the wheel 31 is disposed on the upper side relative to the exterior portion 30, so that the exterior side meshing portion 323 faces the wheel side meshing portion 322 and is disposed at a position away from the wheel side meshing portion 322 on the lower side.

[0057] When a load greater than the biasing force of the biasing means 321 is applied to the wheel 31 during lifting of the sling main body 3, the wheel side meshing portion 322 remains in place together with the wheel 31, while the exterior side meshing portion 323 is lifted upward together with the exterior part 30. As a result, as shown in Figure 6(b), the position of the wheel 31 relative to the exterior part 30 changes from the upper side to the lower side, the exterior side meshing portion 323 approaches the wheel side meshing portion 322, and the teeth 3230 of the exterior side meshing portion 323 mesh with the teeth 3220 of the wheel side meshing portion 322.

[0058] The toothed portion 3220 and the toothed portion 3230 can be configured with rounded wavy teeth or triangular teeth, but if the toothed portion 3220 and the toothed portion 3230 are formed with triangular teeth as in this embodiment, the contact area between the toothed portion 3220 and the toothed portion 3230 in the circumferential direction of the wheel 31 can be easily secured, so that the effect of restricting the rotation of the wheel 31 by the meshing of the toothed portion 3230 and the toothed portion 3230 can be easily enhanced, and the rotation of the wheel 31 can be minimized. Accordingly, the position of the hoisting tool main body 3 relative to the suspended object during hoisting (for example, the position of the hoisting center line of the hoisting tool main body 3 relative to the center of gravity of the suspended object) is less likely to shift.

[0059] In this manner, the suspension device main body 3 of this embodiment is configured to switch between a state in which the rotation of the wheel 31 is restricted and a state in which the restriction on the rotation of the wheel 31 is released, depending on the position of the wheel 31 relative to the exterior part 30.

[0060] As shown in FIG. 4, the brake mechanism 33 has a brake shoe 330 that is in sliding contact with the wheel 31, and an adjustment means 331 that adjusts the pressing force of the brake shoe 330 against the wheel 31.

[0061] The brake shoe 330 is constantly in contact with the bottom surface of the brake contact portion 311, and is configured to generate a braking force against the rotation of the wheel 31 when the wheel 31 attempts to rotate or when the wheel 31 has rotated. The brake shoe 330 is made of a material that can generate a frictional force between the brake shoe 330 and the bottom surface of the brake contact portion 311, and for example, steel, resin material, sintered material, etc. can be used.

[0062] The adjustment means 331 has a pushing operation portion 3310 that pushes the brake shoe 330 inward in the radial direction of the wheel 31 , and an adjustment operation portion 3311 that adjusts the pressing force of the pushing operation portion 3310 against the brake shoe 330 .

[0063] The pushing operation unit 3310 is configured to move in a direction toward and away from the brake shoe 330 in the radial direction of the wheel 31, and the adjustment operation unit 3311 is the part that is operated when moving the pushing operation unit 3310 in a direction toward or away from the wheel 31.

[0064] The pushing operation portion 3310 has a pushing operation shaft 3310a, one end of which abuts against the brake shoe 330, a shaft holding portion 3310b that holds the operating shaft 3310a in a state in which it can slide in a direction toward and away from the wheel 31, and a shaft biasing portion 3310c that biases the operating shaft 3310a in a direction away from the wheel 31.

[0065] The adjustment operation part 3311 is configured with an elongated lever. The adjustment operation part 3311 is attached to the exterior part 30 at a middle part between one end and the other end in the longitudinal direction so as to be rotatable relative to the exterior part 30.

[0066] One end of the adjustment operation unit 3311 in the longitudinal direction is configured as an operation unit 3311a that is pulled by the user, and the other end of the adjustment operation unit 3311 in the longitudinal direction is configured as an axis pushing unit 3311b that pushes the pushing operation axis 3310a toward the wheel 31.

[0067] In the adjustment means 331 of this embodiment, when the operation part 3311a is pulled downward, the entire adjustment operation part 3311 rotates and the shaft pressing part 3311b moves upward. When the shaft pressing part 3311b moves upward, it presses the pushing operation shaft 3310a toward the wheel 31 side (the brake shoe 330 side), so that the pushing operation shaft 3310a presses the brake shoe 330, and the rotation of the wheel 31 is suppressed.

[0068] When the operating state of the operating portion 3311a is released, the pushing operation shaft 3310a is pushed by the shaft biasing portion 3310c and moves in a direction away from the wheel 31, and when the shaft pushing portion 3311b is pushed back (pushed down) by the pushing operation shaft 3310a, the adjustment means 331 rotates and returns to its original state.

[0069] In addition, since the adjustment operation unit 3311 in this embodiment is configured as a lever as described above, it is possible to adjust the position of the pushing operation unit 3310 (i.e., the pressing force on the brake shoe 330) depending on how much the adjustment operation unit 3311 is turned (pulled).

[0070] The shaft pressing portion 3311b may be operated by being held directly in the user's hand, or may be operated by being pulled by attaching a stick or a string to it.

[0071] As shown in Figure 7(a), the switching control means 34 has a movement control part 340 that controls the downward movement of the wheel 31 relative to the exterior part 30, and a connecting shaft 341 that rotatably connects the movement control part 340 to the exterior part 30.

[0072] The movement restricting portion 340 is configured to enable the position of the wheel 31 relative to the exterior portion 30 to be changed downward in an upright state in which the upper and lower ends of the exterior portion 30 are aligned in a straight line in the vertical direction, and to prevent the position of the wheel 31 relative to the exterior portion 30 from being changed downward in an inclined state in which the positions of the upper and lower ends of the exterior portion 30 are misaligned in the direction in which one end and the other end of the chain 2 are aligned.

[0073] The movement restricting portion 340 in this embodiment is configured to engage (embrace) the rotation axis P1 from below when the exterior portion 30 switches from the upright state to the inclined state, as shown in FIG. 7(b), and to move away from the rotation axis P1 when the exterior portion 30 switches from the inclined state to the upright state, as shown in FIG. 7(a).

[0074] The movement regulating portion 340 in this embodiment has a rotary connecting portion 3400 that is rotatably connected to the exterior portion 30 at a position spaced upward from the rotation axis P1, and a pair of engaging claw portions 3401 extending from the rotary connecting portion 3400, the engaging claw portions 3401 being arranged side by side with a gap between them.

[0075] A connecting shaft 341 is inserted through the rotary connecting part 3400 and the plate 301, so that the rotary connecting part 3400 is configured to be rotatable about the connecting shaft 341. Therefore, the rotary connecting part 3400 swings like a pendulum with respect to the exterior part 30.

[0076] The rotary coupling part 3400 is disposed at a position where the rotary axis P1 is interposed between a pair of engaging claw parts 3401. The rotary coupling part 3400 of this embodiment is disposed so as to overlap with the outer surface of the plate 301. A coupling shaft 341 is inserted through the rotary coupling part 3400 and the plate 301, so that the rotary coupling part 3400 is configured to be rotatable with respect to the plate 301 (exterior part 30).

[0077] At the tip of each engaging claw 3401, a return portion 3401a is formed which protrudes toward the adjacent engaging claw 3401 side.

[0078] Here, as shown in Figure 8, the rotating shaft P1 in this embodiment comprises an axle main body portion P10 that is inserted into the center of the wheel 31, a guided axle portion P11 that extends outward from the axle main body portion P10 along the axial direction of the axle main body portion P10 and is inserted into the axle insertion portion 320 of the plate 301, and an engaged portion P12 that extends outward from the tip of the guided axle portion P11 along the axial direction and is engaged with the movement regulating portion 340 from below.

[0079] The shaft main body P10 is cylindrical, but both end faces (both end faces in the horizontal direction perpendicular to the vertical direction and the axial direction) of the guided shaft portion P11 are flat to match the shape of the shaft insertion portion 320, and the bottom surface of the engaged portion P12 is flat with which the return portion 3401a can be engaged from below. When the rotating shaft P1 is viewed from the axial direction, the engaged portion P12 is formed in a semicircular shape, but may have a shape other than a semicircular shape as long as the return portion 3401a of the engaging claw portion 3401 can be engaged.

[0080] In addition, the guided shaft portion P11 and the engaged portion P12 may be formed only at one end or the other end of the shaft main body portion P10, or may be formed at both one end and the other end of the shaft main body portion P10.

[0081] When the exterior 30 is in an upright state, the rotation coupling portion 3400 is disposed above the rotation axis P1, and the pair of engagement claws 3401 are disposed on both sides of the rotation axis P1 (at positions spaced apart on the left and right sides). The return portions 3401a of the engagement claws 3401 are also disposed on both sides of the rotation axis P1. In this case, even when the arrangement position of the wheel 31 with respect to the exterior 30 changes from the upper side to the lower side, the wheel 31 remains in non-contact with the rotation axis P1, so that the arrangement position of the wheel 31 can be changed. In other words, the rotation of the wheel 31 can be restricted by the lock mechanism 32.

[0082] When the exterior part 30 changes from an upright state to an inclined state, the rotation axis P1 moves laterally together with the exterior part 30. At this time, the connecting shaft 341 and the movement restricting part 340 also move laterally, but since the pair of engaging claw parts 3401 maintain a drooping posture, the movement restricting part 340 becomes in a state rotated relatively to the rotation axis P1, and the engaging claw part 3401 goes around to the underside of the engaged part P12.

[0083] In this case, even if the position of the wheel 31 with respect to the exterior part 30 is to be changed from the upper side to the lower side, the wheel 31 is held to the exterior part 30 by the switching restriction means 34, and therefore the position of the wheel 31 with respect to the exterior part 30 cannot be changed from the upper side to the lower side. As a result, the rotation of the wheel 31 cannot be restricted by the lock mechanism 32.

[0084] The configuration of the suspender 1 according to this embodiment is as described above. Next, a method of using the suspender 1 will be described.

[0085] When the lifting tool 1 is used to lift an object O to be lifted, the chain 2 is hung on the outer circumferential side surface of the wheel 31, and both ends are connected to the object O to be lifted.

[0086] Since wheel 31 receives a braking force from brake mechanism 33, even if the length from the position where chain 2 is hooked on wheel 31 to one end (hereinafter referred to as the length on one end side) and the length from the position where chain 2 is hooked on wheel 31 to the other end (hereinafter referred to as the length on the other end side) are unequal as shown in Fig. 1, wheel 31 does not rotate and this state can be maintained. Therefore, the length on one end side and the length on the other end side of chain 2 can be roughly adjusted in advance according to the position of the center of gravity of suspended object O.

[0087] Then, the hanging portion 300 is hung on a hoisting machine, and the position of the hoisting tool main body 3 is adjusted.

[0088] Before the hoist main body 3 is lifted, the wheel 31 is not subjected to a load greater than the biasing force of the biasing means 321. Therefore, the wheel 31 is in a state in which it is pulled upward with respect to the exterior 30 by the biasing force of the biasing means 321 (see FIG. 6(a)). At this time, the teeth 3230 of the exterior side meshing portion 323 and the teeth 3220 of the wheel side meshing portion 322 are separated from each other, so that the wheel 31 is subjected to a braking force from the brake mechanism 33 but is in a rotatable state.

[0089] When adjusting the position of the hoisting device main body 3, the hoisting device main body 3 is moved to one end side or the other end side of the chain 2 while rotating the wheel 31. For example, the position of the hoisting device main body 3 may be set to match the center of gravity G of the object to be lifted O as shown in Figs. 8 and 9, but it may also be set to a position offset from the center of gravity G of the object to be lifted. At this time, the hoisting device main body 3 can be easily moved by operating the adjustment operation part 3311 as a lever to weaken the braking force applied to the wheel 31 by the brake mechanism 33.

[0090] In addition, since the brake mechanism 33 of this embodiment can adjust the pressing force of the brake shoe 330 against the wheel 31 by the adjustment means 331, it is possible to prevent the wheel 31 from rotating too much as long as a braking force against the rotation of the wheel 31 is generated within the range in which the wheel 31 can rotate. In this way, by preventing the wheel 31 from rotating excessively, it is possible to easily adjust the position of the hoisting device main body 3.

[0091] Then, the hoisting tool main body 3 is hoisted by a hoisting machine. When the hoisting tool main body 3 starts to be hoisted by the hoisting machine, if the position of the center of gravity G of the object to be hoisted O is displaced from the hoisting center line CL (a virtual line extending in the vertical direction through the position where the hoisting tool main body 3 is hoisted), the wheel 31 can be rotated to move the position of the hoisting tool main body 3 to the one end side or the other end side of the chain 2 by pulling the hoisting tool main body 3 toward the one end side or the other end side of the chain 2 with a force larger than the braking force of the brake mechanism 33. Therefore, when the hoisting tool main body 3 is hoisted, the position of the hoisting tool main body 3 is automatically adjusted so that the position of the center of gravity G of the object to be hoisted O and the hoisting center line CL overlap.

[0092] Furthermore, when the position of the wheel 31 relative to the exterior part 30 is changed from the upper side to the lower side and the teeth 3220 of the wheel side meshing part 322 mesh with the teeth 3230 of the exterior side meshing part 323, the rotation of the wheel 31 is completely restricted.

[0093] As described above, according to the suspension device 1 of this embodiment, the rotation of the wheel 31 can be braked by increasing the pressing force of the brake shoe 330 against the wheel 31 using the adjustment means 331, as described above, so that the wheel 31 can be prevented from rotating at an unintended timing, thereby improving ease of use.

[0094] Furthermore, in the sling 1 of this embodiment, the teeth 3220 of the wheel-side meshing portion 322 are formed on the outer circumferential edge portion of the wheel-side meshing portion 322, which is formed with an outer diameter larger than that of the wheel 31, thereby reducing the load on the teeth 3220. Also, since the load on the teeth 3220 is reduced, it is possible to reduce the size of the teeth 3220 and increase the number of the teeth 3220.

[0095] Furthermore, in the suspension device 1 of this embodiment, the fitting groove 310 into which the chain 2 fits and the brake abutment portion 311 against which the brake shoe 330 abuts are formed integrally, thereby enabling the device to perform the function of making it difficult for the wheel 31 to rotate with a simple structure.

[0096] Furthermore, since the brake mechanism 33 has an adjustment means 331 for adjusting the braking force applied to the rotation of the wheel 31, which is configured by a lever, the operator can check the strength of the braking force that the brake mechanism 33 is applying to the rotational movement of the wheel 31 by looking at the direction of the lever, thereby improving ease of use.

[0097] In the lifting device 1 of this embodiment, when the exterior part 30 is pulled diagonally upward by the hoisting machine (when the exterior part 30 is in a so-called diagonally pulled state), the switching control means 34 puts the locking mechanism 32 in a state where it is unable to control the rotation of the wheel 31. Therefore, by leaving the wheel 31 in a rotatable state, it is possible to prevent the object to be lifted O from being lifted while being subjected to a lateral force, and therefore it is also possible to lift the object to be lifted O safely.

[0098] Incidentally, the sling device according to the present invention is not limited to the above-described embodiment, and it goes without saying that various modifications can be made without departing from the spirit and scope of the present invention.

[0099] Although not specifically mentioned in the above embodiment, the wheel side meshing portion 322 and the exterior side meshing portion 323 may be arranged only on the front side or rear side of the wheel 31, or may be arranged on both the front side and rear side of the wheel 31.

[0100] In the above embodiment, the biasing means 321 is configured to push up the rotation shaft P1 from below, but is not limited to this configuration. For example, the biasing means 321 may be configured to pull up the rotation shaft P1 from above.

[0101] Although not specifically mentioned in the above embodiment, the strength can be increased by increasing the tooth width of both the teeth 3220 of the wheel side meshing portion 322 and the teeth 3230 of the exterior side meshing portion 323. It is also possible to provide the wheel side meshing portion 322 and the exterior side meshing portion 323 on one side and the other side of the wheel 31, respectively, so as to support the wheel 31 on both sides.

[0102] In the above embodiment, the biasing means 321 is configured as a torsion spring, but is not limited to this configuration. For example, the biasing means 321 may be configured as a leaf spring, a spring spring, or a tension coil spring.

[0103] 11, the biasing means 321 may be formed of a compression coil spring. In this case, the locking mechanism 32 may be configured to have a push-up part 324 that receives the biasing force of the biasing means 321 and pushes up the rotation shaft P1 (specifically, the engaged part P12 of the rotation shaft P1), and an adjustment mechanism 325 that adjusts the compression force of the biasing means 321.

[0104] As shown in FIG. 12, the push-up portion 324 has an abutment head 3240 that abuts against the underside of the engaged portion P12 of the rotation shaft P1, a first extension shaft 3241 that extends downward from the abutment head, and a second extension shaft 3241 that extends downward from the tip of the first extension shaft 3241.

[0105] The upper surface of the abutting head 3240 abuts against the lower surface of the engaged portion P12 of the rotation shaft P1 as described above, and the lower surface of the abutting head 3240 abuts against the biasing means 321.

[0106] The first extension shaft 3241 has a smaller diameter than the abutment head 3240, and the second extension shaft 3242 has a smaller diameter than the first extension shaft 3241. In addition, the first extension shaft 3241 and the second extension shaft 3242 are inserted into the inside of the biasing means 321.

[0107] The adjustment mechanism 325 has a base portion 3250 fixed to the exterior portion, a movable portion 3251 attached so as to be movable up and down relative to the base portion 3250, and a lower support portion 3252 that receives the lower end of the biasing means 321 and is configured to move up and down together with the movable portion 3251.

[0108] 12 is formed in a bolt shape and is screwed into the base part 3250. Specifically, the movable part 3251 has a screw thread formed on its outer circumferential surface and includes a movable shaft part 3251a that can be screwed into a screw hole formed in the base part 3250, and a movable head part 3251b that is connected to one end (lower end) in the axial direction of the movable shaft part 3251a.

[0109] 12 is formed in a bolt shape and is screwed into the base part 3250. Specifically, the movable part 3251 has a screw thread formed on its outer circumferential surface and includes a movable shaft part 3251a that can be screwed into a screw hole formed in the base part 3250, and a movable head part 3251b that is connected to one end (lower end) in the axial direction of the movable shaft part 3251a.

[0110] The movable shaft portion 3251a has an insertion recess 3251c that opens at the other end (upper end) in the axial direction, and the second extension shaft 2342 is slidable in the up-down direction. An insertion recess 3251c is formed.

[0111] The lower support portion 3252 has an annular shape, is placed on the tip of the movable shaft portion 3251a, and has the second extension shaft 3242 inserted through its center.

[0112] The lock mechanism 32 having this configuration can change the compression amount of the biasing means 321 by adjusting the vertical position of the movable shaft portion 3251a, thereby making it possible to adjust the force pushing up the rotation shaft P1.

[0113] In the above embodiment, the wheel side meshing portion 322 has a spur gear shape, but it may have a shape other than a spur gear shape.

[0114] In the above embodiment, the wheel side meshing portion 322 is formed in a disk shape, and the teeth 3220 are formed around the entire circumference of the outer periphery, but the present invention is not limited to this configuration. For example, the wheel side meshing portion 322 may be formed in a ring shape, and the teeth 3220 may be formed around the entire circumference of the inner periphery. However, when the wheel side meshing portion 322 is formed in a disk shape and the teeth 3220 are formed on the outer periphery, it is easier to increase the outer diameter of the wheel side meshing portion 322, so it is easier to reduce the size of the teeth 3220, and it is also easier to increase the number of teeth 3220, so the load (burden) applied to the teeth 3220 of the wheel side meshing portion 322 can be reduced. [Explanation of symbols]

[0115] Reference Signs List 1... sling, 2... chain, 3... sling body, 20... connecting means, 30... exterior, 31... wheel, 32... locking mechanism, 33... brake mechanism, 34... switching restriction means, 300... hooked portion, 301... plate, 302... roller shaft, 310... engagement groove, 311... brake abutment portion, 320... shaft insertion portion, 321... biasing means, 322... meshing portion, 322... wheel side meshing portion, 323... exterior side meshing portion, 330... brake shoe, 331... adjustment means, 340... movement restricting portion, 341... connecting shaft, 3220... teeth portion, 3230... teeth portion, 3310... push operation portion, 3311... adjustment operation portion, 3400... rotation connecting portion, 3401... engagement claw portion, 3401a... return portion, P1... rotation shaft, P10... shaft main body portion, P11... guided shaft portion, P12... engaged portion

Claims

1. A long chain that is connected to an object to be lifted; A hoisting tool main body that suspends an object to be hoisted via the chain, the hoisting device main body has an exterior part including a hook part to be hung on a hoisting machine, a wheel rotatably attached to the exterior part, the wheel having an engagement part formed on an outer circumferential side surface to engage with the chain, a locking mechanism switchable between a state in which the rotation of the wheel is restricted and a state in which the restriction on the rotation of the wheel is released, and a brake mechanism that brakes the rotation of the wheel; The wheel is movable up and down relative to the exterior part, the locking mechanism includes a biasing means for biasing the wheel upward while allowing the wheel to move up and down, and a pair of meshing portions disposed opposite each other in the vertical direction, the pair of meshing portions moving toward and away from each other as the wheel is vertically displaced relative to the exterior portion, One of the pair of meshing portions is fixed to the wheel, The other of the pair of meshing portions is fixed to the exterior portion, The brake mechanism includes a brake shoe that presses against the wheel, and an adjustment means that adjusts the pressing force of the brake shoe against the wheel. Hanging device.

2. The wheel has an outer circumferential side surface formed with a fitting groove into which the chain fits and a brake abutment portion with which the brake shoe abuts, The brake abutment portion is formed at the bottom of the fitting groove. The sling of claim 1.

3. The adjustment means has a lever exposed to the outside of the exterior body, The lever is configured to change its position in response to a pressing force of the brake shoe against the wheel. The sling according to claim 1 or 2.

4. The hoist body has a switching restriction means for restricting switching of the locking mechanism to a state in which rotation of the wheel is restricted, The switching restriction means is provided on an exterior part and is configured to directly or indirectly hold the wheel from below when the exterior part is inclined toward one end side or the other end side of the chain. The sling according to claim 1 or 2.

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