Equipment hanging jig

Abstract

To provide a tool for hanging equipment which can be fixed to a structure such as a beam without working at a high place.SOLUTION: A first cylinder which extends along a first direction and in which a first long hole is formed, a second cylinder which is inserted into the first cylinder and is movable along the first direction, and a second cylinder which is provided on one end side of the first cylinder, At least one pair of claws movable between a close position where the claws are close to each other with one end interposed therebetween and a separated position where the claws are separated from each other when viewed in a second direction perpendicular to the first direction, and an interlocking mechanism that is connected to the second cylinder and the pair of claws and interlocks the movement of the second cylinder with the movement of the pair of claws, when the second cylinder moves to the other end side opposite to the one end, the pair of claw portions is moved to the close position.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a jig for suspending equipment from a structure such as a beam. [Background technology]

[0002] Equipment hanging jigs for suspending equipment from structures such as beams are known. For example, Patent Document 1 discloses a jig that is fixed with bolts to the bottom flange of an H-shaped steel beam, and that can hang a ceiling substrate as equipment. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2023-166667 Summary of the Invention [Problem to be solved by the invention]

[0004] The jig disclosed in Patent Document 1 requires the work of fastening the jig to the bottom flange of the H-beam with bolts. H-beams, which are beams, are often installed at high altitudes. Therefore, the work of fastening the jig to the bottom flange of the H-beam with bolts is done at high altitudes. To perform work at high altitudes, it is necessary to set up scaffolding or use an aerial work vehicle, which poses problems of longer work times and increased construction costs.

[0005] An object of the present invention is to provide a jig for lifting equipment that can be fixed to a structure such as a beam without working at a height. [Means for solving the problem]

[0006] The equipment lifting jig of the present invention comprises: a first tube extending along a first direction and having a first long hole formed therein, with the first direction as its longitudinal direction; a second tube inserted inside the first tube or surrounding the outside of the first tube and movable along the first direction; at least a pair of claws provided on one end of the first tube and facing each other across one end when viewed along a second direction perpendicular to the first direction, and movable between a close position where they are close to each other and a separated position where they are far from each other; and a linkage mechanism connected to the pair of claws and linking the movement of the second tube with the movement of the pair of claws, wherein the linkage mechanism moves the pair of claws to the separated position when the second tube moves toward one end, and moves the pair of claws to the close position when the second tube moves toward the other end opposite the one end. [Effects of the Invention]

[0007] According to the present invention, it is possible to obtain an equipment lifting jig that can be fixed to a structure such as a beam without working at a height. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a front view showing a schematic configuration of the equipment lifting jig according to the first embodiment. [Figure 2] FIG. 2 is a side view showing a schematic configuration of the equipment lifting jig according to the first embodiment. [Figure 3] FIG. 3 is a plan view showing a schematic configuration of the equipment lifting jig according to the first embodiment. [Figure 4] FIG. 4 is a front view of the fixing portion. [Figure 5] FIG. 5 is a side view of the fixing part. [Figure 6] 6 is a cross-sectional view showing a cross section of the first plate portion taken along line VI-VI shown in FIG. [Figure 7] 7 is a cross-sectional view showing a cross section of the first plate portion taken along line VII-VII shown in FIG. [Figure 8]8 is a cross-sectional view showing a cross section of the first plate portion taken along line VIII-VIII shown in FIG. [Figure 9] 9 is a cross-sectional view taken along line IX-IX shown in FIG. [Figure 10] FIG. 10 is a cross-sectional view showing a cross section taken along line XX shown in FIG. [Figure 11] FIG. 11 is a front view showing the equipment lifting jig and the beam with the pair of claws in the separated position. [Figure 12] FIG. 12 is a front view of the equipment lifting jig showing a state in which the second plate portion is in contact with the lower flange. [Figure 13] FIG. 13 is a front view showing a state in which the first plate portion of the equipment hanging jig is in contact with the lower flange with the pair of claw portions in the separated position. [Figure 14] FIG. 14 is a front view of the equipment hanger with a pair of claws positioned close to each other. [Figure 15] FIG. 15 is a diagram for explaining a method for fixing the equipment hanging jig using a pushing portion. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, an equipment lifting jig according to one embodiment of the present invention will be described in detail with reference to the drawings. However, the present invention is not limited to the embodiment described below.

[0010] [Embodiment 1] <Outline of equipment lifting jig configuration> Fig. 1 is a front view showing a schematic configuration of the equipment hanging jig according to embodiment 1. Fig. 2 is a side view of the equipment hanging jig according to embodiment 1. Fig. 3 is a plan view of the equipment hanging jig according to embodiment 1.

[0011] The equipment lifting jig 1 is used to suspend equipment from a structure such as a beam 100. The equipment lifting jig 1 is fixed to a bottom flange 101 of the beam 100 formed from an H-shaped steel as shown in FIG. 1. Equipment (not shown) attached to the equipment lifting jig fixed to the bottom flange 101 is suspended from the beam 100 via the equipment lifting jig 1. The equipment lifting jig 1 includes a fixed part 2, a movable part 3, claw parts 4, and an interlocking mechanism 5. The fixed part 2, the movable part 3, the claw parts 4, and the interlocking mechanism 5 are formed of, for example, metal.

[0012] <Fixed part> Fig. 4 is a front view of the fixed part. Fig. 5 is a side view of the fixed part. The fixed part 2 comprises a first tube 21, a first plate part 22, a rib plate 23, and a second plate part 24.

[0013] The first tube 21 is a cylindrical member. The cross-sectional shape of the first tube 21 is, for example, rectangular. The central axis direction of the first tube 21, i.e., the direction in which the first tube 21 extends, is defined as the first direction. A Z axis is defined as being parallel to the first direction, with the positive direction along the Z axis being upward and the negative direction along the Z axis being downward.

[0014] 1 and 4, the direction parallel to the depth direction of the paper is defined as the second direction. A Y-axis parallel to the second direction is defined, with the positive direction along the Y-axis being the forward direction and the negative direction along the Y-axis being the backward direction.

[0015] The direction parallel to the first direction (Z axis) and the second direction (Y axis) is defined as the third direction. The X axis is defined as parallel to the third direction, and the positive direction along the X axis is defined as the rightward direction, and the negative direction along the X axis is defined as the leftward direction.

[0016] Two vertically extending elongated holes are formed side by side on each of the front and rear surfaces of first cylinder 21. The elongated hole formed on the top is interlocking elongated hole (first elongated hole) 25, and the elongated hole formed on the bottom is equipment elongated hole 26. Interlocking elongated hole 25 and equipment elongated hole 26 penetrate through the front and rear surfaces of first cylinder 21. The upper end of first cylinder 21 is one end 21a, and the lower end is the other end 21b.

[0017] The first plate portion 22 is joined to one end 21a of the first cylinder 21. The first plate portion 22 extends to the right and left from one end 21a of the first cylinder 21, and is a member having an overall plate-like shape.

[0018] Fig. 6 is a cross-sectional view showing a cross section of the first plate portion taken along line VI-VI shown in Fig. 3. Fig. 7 is a cross-sectional view showing a cross section of the first plate portion taken along line VII-VII shown in Fig. 3. Fig. 8 is a cross-sectional view showing a cross section of the first plate portion taken along line VIII-VIII shown in Fig. 3.

[0019] As shown in FIGS. 6 to 8, the first plate portion 22 includes a top plate 22a, a bottom plate 22b, and two side plates 22c. The top plate 22a forms the top surface of the first plate portion 22. The bottom plate 22b faces the top plate 22a and forms the bottom surface of the first plate portion 22. The two side plates 22c are provided in front of and behind the top plate 22a and the bottom plate 22b. The two side plates 22c are joined to the top plate 22a and the bottom plate 22b at their front and rear. The joining of the top plate 22a and the side plates 22c and the joining of the bottom plate 22b and the side plates 22c are performed, for example, by welding.

[0020] The first plate portion 22 is a member having an overall plate-like shape including a top plate 22a, a bottom plate 22b, and a side plate 22c. The first plate portion 22 is formed by joining the top plate 22a, the bottom plate 22b, and the side plate 22c, so that the cross section (cross section cut along a plane parallel to the first direction and the second direction) when viewed from the side as shown in Fig. 7 is a closed cross section. This allows the first plate portion 22 to be both lightweight and highly rigid.

[0021] 6 and 7, an opening 22d penetrating the bottom plate 22b is formed in the bottom plate 22b. One end 21a of the first tube 21 abuts against the top plate 22a through the opening 22d formed in the bottom plate 22b. One end 21a of the first tube 21 is joined to the top plate 22a. The joining of the one end 21a of the first tube 21 to the top plate 22a is performed by, for example, welding.

[0022] 4 and 5, the rib plate 23 is joined to the left and right side surfaces of the first tube 21. The rib plate 23 is joined to the first tube 21 by, for example, welding. The welding between the rib plate 23 and the first tube 21 is performed between the side surface of the first tube 21 and the rib plate 23.

[0023] The surface of the rib plate 23 that is joined to the first tube 21 has elongated holes 23a that penetrate the rib plate 23 and extend vertically. The elongated holes 23a formed in the rib plate 23 are joining elongated holes (second elongated holes) provided for joining to the first tube 21. For example, the inner peripheral surface of the elongated holes 23a is welded to the side surface of the first tube 21. This increases the area where the first tube 21 and the rib plate 23 are welded, making it possible to more firmly join the rib plate 23 to the first tube 21.

[0024] As shown in Figures 7 and 8, the width of the upper end 23b of the rib plate 23 in the front-to-rear direction is wider than the width of the first tube 21. The upper end 23b of the rib plate 23 abuts against the bottom plate 22b of the first plate portion 22. The upper end 23b of the rib plate 23 is joined to the bottom plate 22b. The joining of the upper end 23b of the rib plate 23 to the bottom plate 22b is performed, for example, by welding. Since the width of the upper end 23b of the rib plate 23 in the front-to-rear direction is wider than the width of the first tube 21, the area to be welded can be increased. By joining the rib plate 23 joined to the first tube 21 to the bottom plate 22b in this manner, the first tube 21 can be joined to the first plate portion 22 more firmly than when the first tube 21 is joined to the first plate portion 22 only at one end 21a. This prevents deformation or breakage due to twisting that occurs when a horizontal load is applied to the first tube 21.

[0025] As shown in FIG. 4 and other figures, two second plates 24 are provided. The two second plates 24, which form a pair, are provided on one end 21a of the first tube 21. When viewed in the front-rear direction, the pair of second plates 24 are provided opposite each other with the one end 21a of the first tube 21 in between. Specifically, the pair of second plates 24 are provided on the first plate 22 and extend upward from the top surface of the first plate 22. When the second plates 24 are deformed in directions away from each other, they function as leaf springs that exert a biasing force in directions toward each other.

[0026] When viewed in the front-to-rear direction, each of the second plate portions 24 is bent so as to convex toward the opposing other second plate portion 24. Returning to FIG. 1 , the distance D1 between the convex portions of the pair of second plate portions 24 is smaller than the width D2 of the bottom flange 101 of the beam 100. In addition, the distance D3 between the upper ends of the pair of second plate portions 24 is larger than the width D2 of the bottom flange 101 of the beam 100.

[0027] <Movable part> The movable part 3 is provided so as to be movable up and down relative to the fixed part 2. As shown in FIGS. 1 and 2, the movable part 3 includes a second tube 31, a limiting protrusion 32, and an equipment mounting part 33. The second tube 31 is a cylindrical member extending in the up-down direction. The cross-sectional shape of the second tube 31 is, for example, rectangular. The second tube 31 is inserted inside the first tube 21 and is provided so as to be movable up and down relative to the first tube 21.

[0028] 9 is a cross-sectional view taken along line IX-IX in FIG. 1. Note that FIG. 9 omits the illustration of an interlocking mechanism 5, which will be described later. As shown in FIG. 9, the limiting protrusions 32 are joined to the front and rear surfaces of the second tube 31. The limiting protrusion 32 joined to the front surface of the second tube 31 protrudes forward from the front surface of the second tube 31. The limiting protrusion 32 joined to the rear surface of the second tube 31 protrudes rearward from the rear surface of the second tube 31.

[0029] Each of the limiting protrusions 32 passes through an interlocking slot 25 formed in the first cylinder 21 and protrudes forward and backward from the first cylinder 21. Because the limiting protrusions 32 formed on the second cylinder 31 pass through the interlocking slots 25, the range in which the second cylinder 31 can move up and down is limited to the range in which the limiting protrusions 32 abut against the upper and lower ends of the interlocking slots 25. The limiting protrusions 32 are linked to the interlocking mechanism 5 and have the function of transmitting the movement of the second cylinder 31 to the interlocking mechanism 5, which will be described in detail below.

[0030] Fig. 10 is a cross-sectional view showing a cross section taken along line XX shown in Fig. 1. As shown in Fig. 10, the equipment mounting portion 33 includes an enclosing portion 33a, a connecting portion 33b, and a mounting protrusion 33c. As shown in Figs. 1, 2, and 10, the enclosing portion 33a is a frame-shaped member that surrounds the periphery of the first tube 21. The connecting portion 33b is provided to pass through the equipment slot 26 and is joined to the second tube 31 and the enclosing portion 33a. By joining the connecting portion to the enclosing portion 33a and the second tube 31, the vertical movement of the second tube 31 and the vertical movement of the enclosing portion 33a are linked.

[0031] The mounting protrusions 33c are provided on the front and rear surfaces of the enclosing portion 33a. Various types of equipment to be suspended from the beam 100 using the equipment suspension jig 1 are attached to the mounting protrusions 33c. There are no particular limitations on the equipment suspended from the beam 100 using the equipment suspension jig 1, and examples include a display board or electronic bulletin board that displays information. Note that the position at which the mounting protrusions 33c are provided is not limited to the exemplified position, and they may be provided on the left or right side of the enclosing portion 33a.

[0032] The second cylinder 31, which is provided so as to be movable up and down, is constantly subjected to a force moving it downward due to its own weight and the weight of the attached equipment.

[0033] <Claws> Returning to FIGS. 1 to 3, the claws 4 are attached to the first plate 22 so as to be rotatable about a rotation axis extending in the front-rear direction. When viewed along the front-rear direction, two claws 4 arranged opposite each other with one end 21a of the first tube 21 sandwiched therebetween constitute a pair of claws 4. As shown in FIGS. 2 and 3, a pair of claws 4 is provided at the front and rear of the first plate 22. This can be said to mean that the equipment lifting jig 1 has two pairs of claws 4 arranged side by side in the front-rear direction. Note that the number of pairs of claws 4 arranged side by side in the front-rear direction is not limited to two. The thickness of each of the claws 4 along the front-rear direction is thinner than the width of the second plate 22 along the front-rear direction.

[0034] Each of the pair of claws 4 can be rotated to move between a close position where they are close to each other and a far position where they are far from each other. Each claw 4 has a recess 41 that recesses in a direction from the close position to the far position. As shown in FIG. 1 , a bottom flange 101 of a beam 100 to which the equipment lifting jig 1 is fixed fits into the recess 41 when the claws 4 are in the close position. That is, the equipment lifting jig 1 is fixed to the beam 100 by clamping the bottom flange 101 between the claws 4. Note that by varying the size of the claws 4 and the recess 41 depending on the shape and size of the object to be clamped by the claws 4, the equipment lifting jig 1 can be fixed to structures other than the beam 100.

[0035] <Interlocking mechanism> The interlocking mechanism 5 interlocks the vertical movement of the second cylinder 31 with the movement of the claw portion 4.

[0036] The interlocking mechanism 5 includes a first arm (claw-side arm) 51 and a second arm 52 that connect the restricting protrusion 32 provided on the second cylinder 31 to the claw portion 4. As shown in Fig. 1, the left claw portion 4 and the right claw portion 4 are each connected to the restricting protrusion 32 via the first arm 51 and the second arm 52, but both have the same configuration. Therefore, the configuration in which the left claw portion 4 is connected to the restricting protrusion 32 will be described, and a description of the configuration in which the right claw portion 4 is connected to the restricting protrusion 32 will be omitted.

[0037] The first arm 51 is formed integrally with the claw portion 4. Therefore, the first arm 51 is attached to the first plate portion 22 so as to be rotatable around a rotation axis extending in the front-rear direction together with the claw portion 4. The first arm 51 and the claw portion 4 may be formed by integral molding, or may be formed by joining separately formed parts by welding or the like.

[0038] The first arm 51 extends rightward from the claw 4 that is integrally formed with the first arm 51. In other words, the first arm 51 extends toward the claw 4 that faces the claw 4 that is integrally formed with the first arm 51. The first arm 51 also extends to the opposite side of one end 21a of the first cylinder 21.

[0039] The first arm 51 is formed so that its thickness in the vertical direction becomes thinner the further it is from the claw portion 4 with which it is integrally formed. By making the portion close to the claw portion 4, which is likely to receive load, thicker and making the portion thinner the further away from there, it is possible to ensure both strength and weight reduction.

[0040] One end of the second arm 52 is rotatably connected to the right end of the first arm 51 about a rotation axis extending along the front-rear direction. The other end of the second arm 52 is rotatably connected to the limiting protrusion 32 about a rotation axis extending along the front-rear direction. At the rear of the first cylinder 21, the claw portion 4 and the limiting protrusion 32 are also connected via the first arm 51 and the second arm 52.

[0041] The first arm 51 and the second arm 52 of the interlocking mechanism 5 connect the claws 4 and the limiting protrusion 32, so that when the movable part 3 including the second cylinder 31 moves upward, the pair of claws 4 move to a separated position, and when the movable part 3 moves downward, the pair of claws 4 move to a close position. Note that the second cylinder 31 may have a portion to which the second arm 52 is connected, separate from the limiting protrusion 32.

[0042] As described in the explanation of the equipment mounting portion 33, a force is constantly acting on the second tube 31 to move it downward due to its own weight and the weight of the equipment being mounted. Therefore, a force is constantly acting on the pair of claws 4 to move them to the close position. In addition, because the first arm 51 extends from the claw 4, with which it is integrally formed, to the opposite side of one end 21a of the first tube 21, the path from the claw 4 to the limiting protrusion 32 can be lengthened. This makes it possible to further increase the force that moves the pair of claws 4 to the close position, which is generated by the force that moves the second tube 31 downward.

[0043] <Procedure for fixing equipment lifting fixtures> 11 is a front view showing the equipment lifting jig and a beam with a pair of claws in a spaced apart position. The distance D4 between the pair of claws 4 in the spaced apart position is wider than the width D2 of the lower flange 101 of the beam 100. At this time, the limiting protrusion 32 (second tube 31, movable part 3) is pushed up to a position where it has moved upward. When fixing the equipment lifting jig 1 to the beam 100, first, the first plate part 22 is placed opposite the lower flange 101 as shown in FIG.

[0044] 12 is a front view of the equipment lifting jig showing the second plate portion abutting against the lower flange. Next, as shown in FIG. 12, the entire equipment lifting jig 1 is pushed upward. The distance D3 between the upper ends of the pair of second plate portions 24 is wider than the width D2 of the lower flange 101, so the upper ends of the second plate portions 24 do not abut against the lower flange 101. On the other hand, the distance D1 between the convex portions of the pair of second plate portions 24 is smaller than the width D2 of the lower flange 101, so the convex portions of the second plate portions 24 abut against the lower flange 101.

[0045] FIG. 13 is a front view showing the first plate portion of the equipment lifting jig abutting the lower flange with the pair of claws in the spaced apart position. Next, the entire equipment lifting jig 1 is further pushed upward. This spreads the second plate portion 24, bringing the equipment lifting jig 1 even closer to the lower flange 101. Furthermore, because the distance D4 between the pair of claws 4 in the spaced apart position is greater than the width D2 of the lower flange 101, the equipment lifting jig 1 can be pushed up until the first plate portion 22 abuts the lower flange 101 without the claws 4 interfering with the lower flange. In this state, the pair of second plate portions 24, which were once spread apart, have returned to a shape close to their original shape before being spread apart. As a result, as shown in FIG. 13, the lower flange 101 is sandwiched from above and below between the first plate portion 22 and the convex portion of the second plate portion 24.

[0046] Figure 14 is a front view of the equipment sling fitting with a pair of claws in a close position. With the first plate 22 in contact with the lower flange 101 of the beam 100 (the state shown in Figure 13), the pair of claws 4 can be moved to the close position by moving the movable part 3 including the second tube 31 downward. At this time, the pair of claws 4 provided at the rear also move to the close position.

[0047] When the movable part 3 is moved downward, the second plate part 24 is caught on the lower flange 101 of the beam 100, so the fixed part 2 including the first tube 21 does not move downward, and only the movable part 3 moves downward. This activates the interlocking mechanism 5, and the pair of claw parts 4 moves to the close position.

[0048] Since the distance D5 between the pair of claws 4 in the close position is narrower than the width D2 of the lower flange 101 of the beam 100, the end of the lower flange 101 fits into the recess 41 formed in the claw 4, and the equipment lifting jig 1 is fixed to the beam 100. Here, in order to operate the interlocking mechanism 5 and move the pair of claws 4 to the close position, it is necessary to move only the movable part 3 downward without moving the fixed part 2. Furthermore, in order for the pair of claws 4 to sandwich the lower flange 101 when they move to the close position, the lower flange 101 needs to be positioned between the pair of claws 4 when they move to the close position. In other words, it is necessary to move the movable part 3 downward with the first plate part 22 abutting against the lower flange 101. In the equipment lifting jig 1, when a downward force is applied to move the movable part 3 downward as described above, the second plate part 24 gets caught on the lower flange 101, restricting the downward movement of the fixed part 2, and the first plate part 22 remains in contact with the lower flange 101. Therefore, once the first plate part 22 is brought into contact with the lower flange 101, the pair of claw parts 4 can be clamped between the lower flange 101 by simply moving the movable part 3 downward, thereby fixing the equipment lifting jig 1 to the beam 100. Note that, even if the second plate part 24 is not provided, it is also possible to move only the movable part 3 downward as long as an upward force is continuously applied to the fixed part 2 including the first tube 21.

[0049] By attaching equipment to the equipment mounting portion 33 (see also FIG. 1 etc.) of the equipment lifting jig 1, the equipment can be suspended from the beam 100. Note that the greater the force that moves the movable portion 3 downward, the greater the force with which the pair of claw portions 4 clamp the lower flange 101, thereby firmly securing the equipment lifting jig 1 to the beam 100. The weight of the equipment attached to the equipment mounting portion 33 acts in a direction that moves the movable portion 3 downward, so the weight of the equipment being suspended in the equipment lifting jig 1 is used as a force for firmly securing the equipment lifting jig 1 to the beam 100.

[0050] Therefore, the equipment suspending jig 1 can be firmly fixed to the beam 100 without performing any work to increase the force with which the pair of claws 4 clamp the lower flange 101 near the pair of claws 4 and the lower flange 101. This eliminates the need to work at a high altitude where the beam 100 is installed, making it easier to suspend equipment from a structure such as the beam 100. Furthermore, when working at a high altitude, it is necessary to set up scaffolding for work at high altitudes. However, this scaffolding is no longer necessary, so the time and cost required for setting up the scaffolding can be reduced. This reduces the time and cost required for suspending equipment from a structure such as the beam 100.

[0051] Furthermore, the claws 4 that clamp the lower flange 101 of the beam 100 are thinner in the front-to-rear direction than the first plate 22, and have a smaller area in contact with the lower flange 101. As a result, the pressure applied by the claws 4 to the contact area with the lower flange 101 is greater, making it less likely for the claws 4 to slip relative to the lower flange 101. This prevents the equipment from shifting together with the equipment lifting jig 1, even if an external force is applied to the equipment lifting jig 1 in the front-to-rear direction, which is the extension direction of the beam 100.

[0052] Furthermore, even if the beam 100 is installed at an angle in the front-to-rear direction, by joining one end 21a of the first tube 21 and the first plate portion 22 at an angle that matches the inclination of the beam 100, the first tube 21 can be made vertical and the equipment lifting jig 1 can be fixed to the beam 100. Furthermore, as described above, since the claw portion 4 does not easily slip on the lower flange 101, even if the beam 100 is installed at an angle, it is possible to stably hang the equipment from the beam 100 via the equipment lifting jig 1.

[0053] Furthermore, because the second plate portion 24 is hooked onto the lower flange 101 of the beam 100, the equipment lifting jig 1 remains fixed to the beam 100 even when the pair of claw portions 4 are in the separated position and are not clamping the lower flange 101. Therefore, if the claw portions 4 move to the separated position for some reason after the equipment is hung from the beam 100 via the equipment lifting jig 1, it is possible to prevent the equipment or the equipment lifting jig 1 from immediately falling.

[0054] FIG. 15 is a diagram illustrating a method for fixing the equipment lifting jig using a push-in portion. In FIG. 15, the other end 21b of the first tube 21 is enlarged and partially shown in cross section. As shown in FIG. 15, a push-in portion 6 may be used to fix the equipment lifting jig 1. The push-in portion 6 is formed with an outer diameter that allows it to be inserted into the inside of the first tube 21 from the other end 21b side. The push-in portion 6 inserted into the inside of the first tube 21 abuts against the lower end of the second tube 31. Therefore, by pushing in the push-in portion 6, the movable portion 3 including the second tube 31 can be moved upward.

[0055] Furthermore, since the pushing portion 6 extends downward from the other end of the first tube 21, by the worker holding the pushing portion 6, it becomes possible to position the equipment lifting jig 1 upward without using scaffolding.

[0056] For example, with equipment attached to the equipment mounting portion 33 in advance, the equipment lifting jig 1 is lifted using the push-in portion 6, the first plate portion 22 is pressed against the lower flange 101 of the beam 100, and then the push-in portion 6 is pulled out. The weight of the equipment causes the movable portion 3, including the second tube 31, to move downward. As the movable portion 3 moves downward, the lower flange 101 of the beam 100 is clamped between the pair of claw portions 4, completing the fixation of the equipment lifting jig 1 and the hanging of the equipment. In this way, by attaching the equipment to the equipment mounting portion 33 in advance and then lifting the equipment lifting jig 1 using the push-in portion 6, even if the equipment is to be installed at a high altitude, the installation work does not need to be performed at a high altitude. This reduces the time and cost required for the work.

[0057] The push-in portion 6 may be formed in a cylindrical shape into which the first cylinder 21 is inserted, and may be configured to abut against the surrounding portion 33a of the movable portion 3 from below.

[0058] Furthermore, in the above explanation, an example of a configuration has been described in which the second tube 31 is inserted into the inside of the first tube 21, but the second tube 31 may be formed in a cylindrical shape that surrounds the outside of the first tube 21. In this case, the limiting protrusion 32 is formed so as to protrude from the inner peripheral surface of the second tube 31 and pass through the interlocking elongated hole 25. [Explanation of symbols]

[0059] 1 Equipment lifting jig 2 Fixed part 21 First Cylinder 21a one end 21b other end 22 First plate portion 22a Top plate 22b Bottom plate 22c side plate 22d aperture 23 Rib Plate 23a long hole 23b Top edge 24 Second plate 25 Interlocking slot 26 Long hole for equipment 3 Moving parts 31 Second Cylinder 32 Restriction convex part 33 Equipment mounting part 33a Enclosed section 33b Connection part 33c Mounting protrusion 4 Claws 41 Recess 5 Interlocking mechanism 51 First Arm 52 Second Arm 6 Push-in section 100 beams 101 Lower flange

Claims

1. a first tube extending along a first direction; a second tube inserted inside the first tube or surrounding the outside of the first tube and movable along the first direction; at least a pair of claws provided on one end side of the first cylinder, facing each other across the one end when viewed along a second direction perpendicular to the first direction, and movable between a close position where they are close to each other and a separated position where they are far from each other; a linking mechanism that is connected to the movement of the second cylinder and the pair of claws and links the movement of the second cylinder with the movement of the pair of claws, The interlocking mechanism moves the pair of claw portions to a spaced apart position when the second cylinder moves toward the one end, and moves the pair of claw portions to a close position when the second cylinder moves toward the other end opposite the one end.

2. The equipment lifting jig according to claim 1 , wherein each of the claws has a recess formed therein that is recessed in a direction from the close position toward the separated position.

3. The equipment lifting jig according to claim 1 , wherein the pair of claw portions are arranged in a plurality of pairs along the second direction.

4. a first plate portion joined to the one end of the first cylinder and extending from the one end toward the pair of claw portions; The equipment lifting jig according to claim 1 , wherein the claw portion is rotatably supported by the first plate portion.

5. The equipment lifting jig according to claim 4, wherein a cross section of the first plate portion cut along a plane parallel to the first direction and the second direction is a closed cross section.

6. a rib plate welded to the first cylinder and the first plate portion; The equipment lifting jig according to claim 4, wherein the rib plate is welded to the first cylinder from a third direction side perpendicular to the first direction and the second direction.

7. a second elongated hole having a longitudinal direction in the first direction is formed in a surface of the rib plate that is joined to the first tube, The equipment lifting jig according to claim 6, wherein an inner peripheral surface of the second elongated hole and the first cylinder are welded together.

8. the interlocking mechanism has a claw-side arm formed integrally with the claw portion and extending toward the opposing claw portion, The equipment lifting jig according to claim 1 , wherein the claw-side arm is formed so as to become thinner as it moves away from the claw portion with which it is integral.

9. The device further includes a pair of second plate portions that are provided on one end side of the first tube and that are opposed to each other across the one end when viewed along the second direction, When viewed along the second direction, each of the second plate portions is bent so as to be convex toward the opposing second plate portion, The equipment lifting jig according to claim 1 , wherein the distance between the pair of second plate portions is shorter than the distance between the pair of claw portions in the spaced apart position.

10. a first elongated hole having a longitudinal direction in the first direction is formed in the first cylinder; The equipment lifting jig according to claim 1 , further comprising a limiting protrusion provided on the second cylinder, passing through the first elongated hole, and limiting the range of movement of the second cylinder.

11. The equipment lifting jig according to claim 1 , further comprising an equipment mounting portion that is formed integrally with the second cylinder and that is capable of mounting equipment on the outside of the first cylinder.

12. The equipment lifting jig according to claim 1, further comprising a pushing portion attached to the other end of the first tube and moving the second tube toward the one end by moving the pushing portion toward the one end.

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