Sling

Abstract

To provide a sling that is usable even for a rod-like workpiece different in length and sectional shape by adjusting one part according to the sectional shape and length of the workpiece.SOLUTION: There is provided a sling 10 for hanging a rod-like workpiece 50, and the sling comprises a slide part 14 which has claw fitting parts 15 at both ends respectively and is adjustable in distance between the claw fitting parts 15 according to the length of the workpiece 50, a claw part 16 which has a workpiece receiving pin 16f capable of engaging the workpiece 50 respectively, and can project the workpiece receiving pin 16f toward the workpiece 50 and fit it to the claw fitting part 15 of the slide part 14, and a clip part 28 which mutually fixes the claw fitting part 15 and claw part 16, wherein the claw part 16 is replaceable according to the sectional shape of the workpiece 50.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a lifting device, and more particularly to a lifting device suitable for stably lifting a relatively large and heavy rod-shaped workpiece, such as an ingot for casting. [Background technology]

[0002] For example, to move a relatively large and heavy rod-shaped workpiece such as a cast ingot, gravestone, or steel material, it is often necessary to lift the workpiece using the power of a machine such as a crane. In this case, the workpiece to be lifted is hung from the hook of the crane and moved, but the workpiece cannot be directly hooked to the hook. For this reason, a method of using a hoisting tool to hook the workpiece to the hook has been used in the past. Also, various structures of hoists used in this case are known (see, for example, Patent Document 1 and Patent Document 2).

[0003] In Patent Document 1, the hoisting device includes a pair of opening / closing rods pivotally connected to each other at their upper parts, a hoisting fitting connected to the upper parts of the opening / closing rods, arm members connected to the lower parts of each opening / closing rod, a locking claw member fixed to the lower part of each arm member, and a guide rod connecting the arm members so that they can move relatively on the same axis.The structure disclosed has a fixing mechanism interposed between the pair of opening / closing rods to fix the opening / closing angle of the opening / closing rods.

[0004] Patent Document 2 discloses a structure in which a pair of gripping arms that are opened and closed by an actuator are provided with detachable gripping claws at the lower portions thereof, and the gripping claws are used to grip and release heavy objects. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2014-55060 A [Patent Document 2] Japanese Utility Model Application Publication No. 2-139887 Summary of the Invention [Problem to be solved by the invention]

[0006] In the structure described in Patent Document 1, the locking claws are inserted under the workpiece according to the length of the rod-shaped workpiece by sliding the horizontal arm by operating the opening and closing rod, and the ingot can be placed on the locking claws, and in that state, the hook of the crane side is hung on the upper hanging metal fitting and lifted. However, if the diameter of the workpiece is different, the interval between the locking claws needs to be changed according to the diameter of the workpiece. In other words, since the locking claws are fixed, a hanging tool that has an interval between the locking claws that matches the diameter of the workpiece must be prepared. Therefore, there are problems in that it takes time to change the hanging tool, and further, it is necessary to prepare many types of hanging tools, and it is necessary to store and manage many types of hanging tools, which requires time and space.

[0007] The structure described in Patent Document 2 is designed to allow the gripping jaws to be detachably replaced and to be replaced when the gripping jaws become worn. However, the distance between the two gripping jaws attached to the lower parts of the left and right gripping arms cannot be changed. Therefore, there was a problem that it could not be used when the diameter of the workpiece changed.

[0008] Therefore, a technical problem arises that must be solved in order to provide a lifting device that can be used in the same way even if the length or cross-sectional shape of a rod-shaped workpiece changes by adjusting parts of it according to the length and cross-sectional shape of the workpiece, and the present invention aims to solve this problem. [Means for solving the problem]

[0009] The present invention has been proposed to achieve the above-mentioned object, and the invention described in claim 1 provides a hanging device for suspending a rod-shaped workpiece, comprising a slide section having claw mounting portions at both ends, the distance between the claw mounting portions being adjustable according to the length of the workpiece, a pair of claw portions each having a work receiving pin capable of engaging with the workpiece, the work receiving pins protruding toward the workpiece and each being attached to the claw mounting portions of the slide section, and a pair of clip portions each fixing the claw mounting portions and the claw portions, and the claw portions are replaceable according to the cross-sectional shape of the workpiece.

[0010] According to this configuration, by adjusting the distance between the claw mounting parts according to the length of the rod-shaped workpiece and locking the adjusted position between the claw mounting parts with the locking part, the changed rod-shaped workpiece can be stably hung using the same hanging tool. Also, if the cross-sectional shape of the rod-shaped workpiece is changed, by replacing the claw parts attached to the claw mounting parts of the sliding part with claw parts corresponding to the cross-sectional shape of the workpiece, the changed workpiece can be stably hung using the same hanging tool.

[0011] The invention described in claim 2 provides a hanging device having the configuration described in claim 1, wherein the claw mounting portion has a pin hole opening on the underside, the claw portion has a positioning pin that is inserted and arranged to be slidable in the vertical direction into the pin hole and an engageable claw provided on the outer surface of the claw portion, and the clip portion has a catch portion that engages with the engageable claw of the claw portion to prevent the positioning pin inserted into the pin hole from falling out.

[0012] According to this configuration, the claw portion attached to the claw attachment portion by inserting a positioning pin into the pin hole of the claw attachment portion is locked from coming off when the catch portion of the clip portion is engaged with the engaged claw of the claw portion. This allows the claw portion to be replaceably attached and held on the claw attachment portion, i.e., the slide portion side.

[0013] The invention described in claim 3 provides a suspension device having the configuration described in claim 1, wherein the slide portion comprises a plurality of rails that move linearly relative to each other and bearing balls arranged between the rails.

[0014] According to this configuration, when the slide portion is moved linearly along the multiple rails, the slide portion can be moved smoothly with the rolling of the bearing balls disposed between the rails. Effect of the Invention

[0015] According to the present invention, even if the length, cross-sectional shape, etc. of a rod-shaped workpiece changes, by adjusting the length of the slide or replacing the claw portion according to the length, cross-sectional shape, etc. of the workpiece, the same hanging device can be used to stably hang the rod-shaped workpiece, making it easier to store and manage the hanging device and reducing costs. [Brief description of the drawings]

[0016] [Figure 1] 1 is an overall schematic diagram of a hoist shown as one example according to an embodiment of the present invention, together with a rod-shaped workpiece to be suspended by this hoist. [Diagram 2] 2 is an enlarged cross-sectional view taken along line AA in FIG. 1; [Diagram 3] 1A is an enlarged oblique view of the claw portion and clip portion of the same hanging device, where (a) is a diagram showing the state in the middle of attaching the claw portion to the claw portion attachment portion, (b) is a diagram showing the state after the claw portion has been attached to the claw portion attachment portion, and (c) is a diagram of the claw portion as viewed from the attachment surface side. [Figure 4] 5A and 5B are diagrams illustrating the procedure for attaching the claw portion to the claw portion attachment portion, and correspond to the cross section B-B of FIG. 3(b), in which (a) is a diagram illustrating the state in which the claw portion is positioned below the claw portion attachment portion, (b) is a diagram illustrating the state in which the positioning pin of the claw portion is inserted into the pin hole of the claw attachment portion, (c) is a diagram illustrating the intermediate locking state in which the catch portion of the clip portion is engaged with the engaged claw of the claw portion, and (d) is a diagram illustrating the state in which the catch portion of the clip portion has finished engaging and locking the engaged claw of the claw portion. [Diagram 5]1 is an explanatory diagram of the procedure for lifting a rod-shaped workpiece using the same lifting tool, where (a) shows the lifting tool being lowered to the position of the workpiece to be suspended, (b) shows a pair of claws of the lifting tool engaged with the underside of the workpiece to be suspended, and (c) shows the workpiece being suspended by the lifting tool. [Figure 6] 6A and 6B are detailed views of a portion corresponding to FIG. 5A, where (a) is a perspective view of FIG. 5A and (b) is an enlarged cross-sectional view taken along CC in FIG. 5A. [Figure 7] 10A and 10B are cross-sectional views showing modified examples of a rod-shaped workpiece and a claw portion corresponding to the workpiece, where (a) is a diagram when the cross-sectional shape of the rod-shaped workpiece is square, and (b) is a diagram when the cross-sectional shape of the workpiece is H-shaped. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] In order to achieve the object of providing a hanging device that can be used the same way even if the length or cross-sectional shape of a rod-shaped workpiece changes by adjusting parts of it according to the length and cross-sectional shape of the workpiece, the present invention provides a hanging device for hanging a rod-shaped workpiece, the hanging device comprising: a slide section having a claw mounting section at each end, the distance between the claw mounting sections being adjustable according to the length of the workpiece, a pair of claw sections each having a pin that can engage with the workpiece and the pins protruding toward the workpiece so that they can be attached to the claw mounting sections of the slide section, and a pair of clip sections that each fix the claw mounting sections to the claw sections, the claw sections being configured to be replaceable according to the cross-sectional shape of the work. EXAMPLES

[0018] An embodiment of the present invention will be described in detail below with reference to the accompanying drawings. In the following embodiment, when the number, value, amount, range, etc. of components are mentioned, the number is not limited to the specific number, and may be more or less than the specific number, unless otherwise specified or when it is clearly limited to a specific number in principle.

[0019] In addition, when referring to the shape or positional relationship of components, etc., this includes things that are substantially similar or approximate to those shapes, etc., unless otherwise specified or considered to be clearly different in principle.

[0020] In addition, the drawings may exaggerate characteristic parts to make the features easier to understand, and the dimensional ratios of the components may not be the same as the actual ones. In addition, in cross-sectional views, hatching of some components may be omitted to make the cross-sectional structure of the components easier to understand.

[0021] In the following description, the expressions indicating directions such as up, down, left, right, etc. are not absolute, but are appropriate when each part of the sling of the present invention is in the posture depicted, but if the posture is changed, the interpretation should be changed accordingly. Also, the same elements are given the same reference numerals throughout the description of the embodiment.

[0022] 1 and 2 show a hoist 10 according to an embodiment of the present invention together with a rod-shaped workpiece 50 suspended by the hoist 10, with FIG. 1 being an overall schematic view of the hoist 10 and FIG. 2 being an enlarged cross-sectional view taken along line AA in FIG. 1. Note that in the embodiment in FIGS. 1 and 2, a workpiece 50 having a circular cross-sectional shape is used as the rod-shaped workpiece 50. Also, the workpiece 50 is, for example, a round bar ingot for casting, made of Inconel, with an outer diameter of 70 to 80 mm, a length of 500 to 880 mm, and a weight of 27 to 55 kg.

[0023] 1 and 2, the sling 10 according to this embodiment has a sling 12 whose upper part is pivotally connected to each other by a support shaft 11, a slide part 14 connected to the lower part of the sling 12 by a support shaft 13, claw part attachment parts 15 formed separately on both horizontal ends of the slide part 14, and claw parts 16 attached to the claw part attachment parts 15. Although not shown, a suspension ring for engaging a suspension hook of a crane or the like is attached to the upper part of the sling 12 via the support shaft 11. Also, the sling 12, the claw part attachment part 15, and the claw part 16 are all equipped in pairs on the left and right as shown in FIG. 1. Therefore, in this embodiment, the left side in FIG. 1 is called the first sling 12a, the first claw part attachment part 15a, and the first claw part 16a, and the right side is called the second sling 12b, the second claw part attachment part 15b, and the second claw part 16b to distinguish them from each other. Furthermore, when there is no need to distinguish between them, the sling is indicated by the reference numeral 12, the claw attachment portion by the reference numeral 15, and the claw by the reference numeral 16. Each portion will be described below in order.

[0024] The slings 12 are formed into approximately the same elongated rod-like shape from thick metal plate material such as steel, and each upper part is connected to the crane's suspension hook so that it can rotate around the support shaft 11, and each lower part is connected to the slide section 14 via the support shaft 13 so that it can rotate around the support shaft 13.

[0025] The slide portion 14 has a first rail mounting portion 14a and a second rail mounting portion 14b that move linearly relative to each other, and a guide rail portion 14c interposed between the first rail mounting portion 14a and the second rail mounting portion 14b. The slide portion 14 is also provided with a locking portion 17 that locks and fixes the adjusted positions of the first rail mounting portion 14a and the second rail mounting portion 14b after they move linearly relative to each other.

[0026] The first rail mounting portion 14a and the second rail mounting portion 14b are formed from a metal plate material such as steel, and are formed to have approximately the same width in the height direction.

[0027] A slit-like guide hole 18 extending in the left-right direction is formed in the approximate middle of the second rail mounting portion 14b in the height direction as shown in Fig. 1. The first rail mounting portion 14a and the second rail mounting portion 14b are stacked in the front-rear direction with the guide rail portion 14c and the lock portion 17 sandwiched therebetween.

[0028] One end (rear end) of the lock shaft 17a, which penetrates the lock shaft mounting hole 19 from front to back and is attached to the second rail mounting part 14b together with the friction member 17e, is fixed to the first rail mounting part 14a by the retaining member 20, and the other end (front end) of the lock shaft 17a penetrates the guide hole 18 of the second rail mounting part 14b from front to back and protrudes to the front surface of the second rail mounting part 14b. A lock lever 17b is attached to the other end of the lock shaft 17a protruding to the front surface side of the second rail mounting part 14b so as to be rotatable together with the lock shaft 17a. A friction member 17c is attached to the lock shaft 17a between the lock lever 17b and the second rail mounting part 14b via a washer 21, and a friction member 17d and the friction member 17e are attached between the retaining member 20 and the second rail mounting part 14b.

[0029] The lock section 17 is composed of the above-mentioned lock shaft 17a, lock lever 17b, friction member 17c, friction member 17d, friction member 17e, etc. When the lock lever 17b is rotated together with the lock shaft 17a, for example, in a clockwise direction, a large frictional force is generated between the second rail mounting section 14b and the friction member 17c, friction member 17d, and friction member 17e due to the action of a cam section (not shown) provided on the lock lever 17b, and a locked state in which movement in the left-right direction is not possible between the first rail mounting section 14a and the second rail mounting section 14b can be achieved. Conversely, when the lock lever 17b is rotated counterclockwise together with the lock shaft 17a, the frictional forces between the second rail mounting part 14b and the friction members 17c, 17d and 17e are attenuated by the action of a cam portion provided on the lock lever 17b, and the movement lock between the first rail mounting part 14a and the second rail mounting part 14b is released, so that the locked state can be switched to the unlocked state. Conversely, the unlocked state can also be switched to the locked state.

[0030] A pair of guide rail portions 14c are provided along the longitudinal direction of the first rail mounting portion 14a and the second rail mounting portion, respectively, corresponding to the upper and lower positions of the guide hole 18 of the second rail mounting portion 14b. Each guide rail portion 14c has a first rail 22, a second rail 23, and an intermediate rail 24 arranged between the first rail 22 and the second rail 23. The order of the arrangement of the first rail 22, the second rail 23, and the intermediate rail 24 in the front and rear is reversed from the top to the bottom. That is, as shown in FIG. 2, the guide rail portion 14c provided above the guide hole 18 is arranged in the order of the first rail 22, the intermediate rail 24, and the second rail 23 from the second rail mounting portion 14b side, and the first rail 22 is fixed to the inner surface of the second rail mounting portion 14b, and the second rail 23 is fixed to the inner surface of the first rail mounting portion 14a. In contrast, the guide rail portion 14c provided below the guide hole 18 is arranged in the order of the second rail 23, intermediate rail 24, and first rail 22 from the second rail mounting portion 14b side, with the second rail 23 fixed to the inner surface of the second rail mounting portion 14b and the first rail 22 fixed to the inner surface of the first rail mounting portion 14a.

[0031] Moreover, the first rail 22, the second rail 23, and the intermediate rail 24 are each formed with both side portions bent at a substantially right angle to have a substantially U-shaped cross section. Furthermore, a bearing guide groove 22a is provided on the outer surface of the side portion of the first rail 22, and a bearing guide groove 23a is provided on the inner surface of the side portion of the second rail 23. Furthermore, a bearing guide groove 24a is provided on the inner surface of the side portion of the intermediate rail 24, corresponding to the bearing guide groove 22a of the first rail 22. Furthermore, on both corresponding side surfaces of the first rail 22, the second rail 23, and the intermediate rail 24, a bearing guide groove 24b is provided on the outer surface of the side portion of the intermediate rail 24, corresponding to the bearing guide groove 23a of the second rail 23. In addition, a plurality of bearing balls 25 are interposed between the bearing guide groove 22a of the first rail 22 and the bearing guide groove 24a of the intermediate rail 24, and between the bearing guide groove 24b of the intermediate rail 24 and the bearing guide groove 23a of the second rail 23.

[0032] When a force is applied to move the first rail mounting portion 14a and the second rail mounting portion 14b in the left-right direction relative to each other with the lock portion 17 set in the unlocked state, the first rail mounting portion 14a and the second rail mounting portion 14b can move in the longitudinal direction of the guide rail portion 14c due to the guide action of the first rail 22, the second rail 23, the intermediate rail 24, and the bearing balls 25 attached between the first rail mounting portion 14a and the second rail mounting portion 14b. Note that the guide rail portion 14c uses three rails, the first rail 22, the second rail 23, and the intermediate rail 24, but it does not necessarily have to be three rails, and may be composed of two or more (multiple) rails that move linearly relative to each other.

[0033] The claw attachment portion 15 is composed of a first claw attachment portion 15a attached to the left end of the first rail attachment portion 14a and a second claw attachment portion 15b attached to the right end of the second rail attachment portion 14b, with the first claw portion 16a of the claw portion 16 replaceably attached to the first claw attachment portion 15a and the second claw portion 16b of the claw portion 16 replaceably attached to the second claw attachment portion 15b. The first claw attachment portion 15a and the second claw attachment portion 15b are each configured symmetrically, and the first claw portion 16a and the second claw portion 16b are also each configured symmetrically. Therefore, for the claw portion mounting portion 15, the configuration of the first claw portion mounting portion 15a will be described, and for the claw portion 16, the configuration of the first claw portion 16a will be described. The second claw portion mounting portion 15b will be given the same symbol as the first claw portion mounting portion 15a, and similarly, the second claw portion 16b will be given the symbol as the first claw portion 16a, and duplicate explanations will be omitted.

[0034] Fig. 3 is a partially enlarged perspective view showing the configuration of the first claw attachment portion 15a and the first claw portion 16a, and Fig. 4 is a cross-sectional view showing a structure for attaching the first claw portion 16a to the first claw attachment portion 15a. The configuration of the first claw attachment portion 15a and the first claw portion 16a will be described below with reference to Figs. 3 and 4 in addition to Figs. 1 and 2.

[0035] As shown in Fig. 3, the first claw attachment portion 15a has a claw support 26 that hangs down from the left end of the first rail attachment portion 14a. A clip attachment hole 27 that is cut out from the outer surface of the claw attachment portion 15 to the underside is provided on the lower end side of the claw support 26. A clip 28 that locks the claw 16, which will be described later, is attached inside the clip attachment hole 27. In addition, a pair of pin holes 29 that open to the underside are provided on the underside of the claw support 26, one on each side of the clip attachment hole 27.

[0036] Similarly, as shown in FIG. 3, the first claw portion 16a has a flat rectangular claw portion body 16c attached to the lower surface of the claw portion support 26. A pair of positioning pins 16d are provided vertically upward on the upper surface of the claw portion body 16c in correspondence with a pair of pin holes 29 provided on the lower surface of the claw portion support 26. The pair of positioning pins 16d are inserted and arranged in the pin holes 29 so as to be slidable in the vertical direction, and the first claw portion 16a can be positioned relative to the first claw portion attachment portion 15a. In addition, an engaged claw 16e with a tip bent downward is attached to the outer peripheral surface of the claw portion body 16c provided at a position corresponding to the clip portion 28, and a work receiving pin 16f is provided on the outer peripheral surface arranged opposite the engaged claw 16e and facing the workpiece 50 in a state of protruding approximately horizontally on the side facing the workpiece 50.

[0037] Then, this first claw portion 16a can be arranged at a predetermined position on the underside of the first claw portion attachment portion 15a by aligning the work receiving pin 16f with the workpiece 50, aligning the engaged claw 16e with the clip portion 28, and sliding the pair of positioning pins 16d into the pin holes 29 until they abut against the underside of the first claw portion attachment portion 15a. Furthermore, when the first claw portion 16a is arranged at a predetermined position on the underside of the first claw portion attachment portion 15a and then fixed with the clip portion 28, the first claw portion 16a can be fixed and held against the first claw portion attachment portion 15a so as not to come off.

[0038] 3 and 4, the clip portion 28 has a first clip piece 28a whose lower end is rotatably held by a support shaft 30 in the clip attachment hole 27, and a second clip piece 28b whose upper end is rotatably held by a support shaft 32 slidably attached in an elongated hole 31 of the first clip piece 28a and which can be folded relative to the first clip piece 28a. The lower end of the second clip piece 28b has a catch portion 33 which engages with the engaged claw 16e of the first claw portion 16a and locks the positioning pin 16d of the first claw portion 16a to prevent it from coming off.

[0039] When the first claw portion 16a is attached to the lower surface of the first claw portion attachment portion 15a, the clip portion 28 is in a state in which the first clip piece 28a and the second clip piece 28b are arranged on the outside as shown in Fig. 4(a) and (b), and when the first claw portion 16a is attached to the first claw portion attachment portion 15a, the catch portion 33 is arranged at a position away from the engaged claw 16e of the first claw portion 16a. Also, when the first claw portion 16a is arranged on the lower surface of the first claw portion attachment portion 15a, the lower end side of the second clip piece 28b is rotated inward to move the catch portion 33 below the engaged claw 16e of the first claw portion 16a as shown in Fig. 4(c), so that the catch portion 33 can be engaged with the engaged claw 16e. Furthermore, when the second clip piece 28b is rotated toward the first clip piece 28a and folded onto the first clip piece 28a, the catch portion 33 lifts the engaged claw 16e in conjunction with the folding action, and the first claw portion 16a can be positioned and held on the underside of the first claw portion mounting portion 15a while locking the prevention of the positioning pin 16d inserted into the pin hole 29 from falling out.

[0040] For example, when the hanging load of clip portion 28 is 80 kg and cylindrical workpiece support pin 16f with an outer diameter of 10 mm is arranged as shown in Fig. 2, the shear load received by workpiece support pin 16f, which is a load support portion at one point, is 38 kg (≒ shear stress 4.7 MPa).If the safety factor is 6, the allowable shear stress τ of the load support portion material (material of workpiece support pin 16f) is 29 MPa or more, so that materials such as SS400 (τ = 90 MPa) and SUS304 (τ = 78 MPa) can be used for workpiece support pin 16f.

[0041] Figures 5 and 6 are operation state diagrams of the hoist 10 shown in Figures 1 to 4. An example of the operation of suspending and moving a workpiece 50 will now be described with reference to Figures 5 and 6 in addition to Figures 1 to 4. In Figures 5 and 6, a plurality of rod-shaped workpieces 50 of approximately the same length are stacked and arranged in a container 100, and gaps S are provided between the workpieces 50 into which the workpiece receiving pins 16f can be inserted.

[0042] First, prior to hanging, the support shaft 11 of the hoisting tool 10 is hung by a crane (not shown) and moved above the container 100. In addition, the hoisting tool 10 moved above the container 100 has the distance between the claw attachment parts 15 (between the first claw attachment part 15a and the second claw attachment part 15b) temporarily fixed with a margin relative to the length of the workpiece 50, and is set on the workpiece 50 as shown in Figures 1, 5(a) and 6.

[0043] Next, the locking by the locking portion 17 is released, and the support shaft 11 is lifted upward by a crane until the claw attachment portions 15 on both the left and right sides are in close contact with the end faces of the workpiece 50. Then, the workpiece receiving pin 16f enters the underside of the outer circumferential surface of the workpiece 50 so as to be adjacent to it, and the locking portion 17 is locked as necessary. Figure 5(b) shows this state.

[0044] Next, when the support shaft 11 is further lifted by the crane as shown in Fig. 5(c), the workpiece 50 and the hoist 10 are lifted together with the workpiece support pin 16f supporting the underside of the outer peripheral surface of the workpiece 50. The lifted workpiece 50 and the hoist 10 are then moved, for example, to a receiving platform (predetermined position) of a cutting machine for the next process. Once the workpiece 50 and the hoist 10 have been moved to the predetermined position, the lock by the locking portion 17 is released, the distance between the claw attachment portions 15 is increased, the workpiece support pin 16f is removed from the underside of the workpiece 50, and the workpiece returns to above the container 100, and the same operation is repeated.

[0045] Therefore, with the hoist 10 of this embodiment, even if the length of rod-shaped workpiece 50 changes, by adjusting the distance between the claw mounting parts 15 in accordance with the length of workpiece 50 and locking the adjusted position between the claw mounting parts 15 with lock part 17, the changed rod-shaped workpiece 50 can be stably hung using the same hoist 10. In other words, even for workpieces 50 with varying lengths, they can be stably hung using the same hoist 10 by adjusting the distance between the claw mounting parts 15.

[0046] In the above embodiment, the case where the workpiece 50 has a circular cross section has been described, but the cross section is not limited to the circular cross section, and the workpiece 50 may be used to suspend a square cross section as shown in FIG. 7(a) or an H-shaped cross section as shown in FIG. 7(b). That is, when suspending a square cross section as shown in FIG. 7(a), the claw portion 16 is replaced with the claw portion 16 provided with four workpiece receiving pins 16f that abut against the bottom surface 50a and the side surface 50b of the workpiece 50 to support it. When suspending a H-shaped cross section as shown in FIG. 7(b), the claw portion 16 is replaced with the claw portion 16 provided with four workpiece receiving pins 16f that support the workpiece 50 by sandwiching the bottom surface 50c and the central wall 50d.

[0047] Furthermore, the present invention can be modified in various ways without departing from the spirit of the present invention, and it is natural that the present invention covers such modifications. [Explanation of symbols]

[0048] 10: Hanging device 11: Support shaft 12 :Sling 13: Support shaft 14: Slide section 15: Claw attachment part 16: Claw part 16e: Engaged claw 16f: Workpiece receiving pin 17: Rock Section 18: Guide hole 22: First Rail 23: The second rail 24: Intermediate rail 33: Catch section 50: Work

Claims

1. A hoisting tool for suspending a rod-shaped workpiece, a slide portion having claw attachment portions at both ends, the distance between the claw attachment portions being adjustable according to the length of the work; A pair of claw portions each having a pin that can be engaged with the workpiece, the pin protruding toward the workpiece, and each of the claw portions being attachable to the claw attachment portion of the slide portion; a pair of clip portions each for fixing the claw attachment portion and the claw portion; Equipped with A lifting tool characterized in that the claw portions are replaceable according to the cross-sectional shape of the workpiece.

2. The claw attachment portion has a pin hole opened on a lower surface thereof, The claw portion has a positioning pin that is inserted into the pin hole and an engaged claw that is provided on an outer circumferential surface of the claw portion, The clip portion has a catch portion that is engaged with the engaged claw of the claw portion to prevent the positioning pin inserted into the pin hole from falling out.

2. The sling according to claim 1 .

3. 2. The sling according to claim 1, wherein the slide portion comprises a plurality of rails that move linearly relative to one another, and bearing balls disposed between the rails.

Images