Hanging device

Abstract

To provide a hanging device capable of efficiently transporting a rectangular parallelepiped concrete block. [Solution] A hanging device (10) that hangs and transports at least one block row (101) at a time, each row consisting of a plurality of rectangular parallelepiped concrete blocks (100). The plurality of concrete blocks (100) are arranged in the block row (101) with their face shells (102) in contact with each other. When viewed from the front, a front side stress imaginary line (L1) extending from the lower end of the front side clamping portion (23) in a direction perpendicular to the front side clamping portion (23) passes over the face shell (102) at the other end, and a back side stress imaginary line (L2) extending from the lower end of the back side clamping portion (33) in a direction perpendicular to the back side clamping portion (33) passes over the face shell (102) at one end.

Description

[Technical Field]

[0001] The present invention relates to a suspension device. [Background technology]

[0002] Conventionally, rectangular concrete blocks are used for block walls, building walls, foundations, etc. When building a block wall, a large number of concrete blocks are stacked on pallets and transported by truck or other means to a nearby stacking location. The concrete blocks are then manually carried from the pallets to the stacking location by workers.

[0003] For example, when transporting large, special concrete blocks such as concrete blocks for revetments or long concrete blocks for gutters, it is possible to use the hanging devices described in Patent Documents 1 and 2. However, these hanging devices cannot transport small, rectangular parallelepiped concrete blocks used in block walls and the like. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 09-227065 [Patent Document 2] Japanese Patent Application Laid-Open No. 2004-210487 Summary of the Invention [Problem to be solved by the invention]

[0005] The task of manually carrying concrete blocks used in block walls and other structures from pallets to the stacking location places a great strain on the worker's body, requires a lot of manpower and time, and is inefficient.

[0006] The present invention was developed in light of the above circumstances, and its object is to provide a hanging device that can efficiently transport rectangular parallelepiped concrete blocks. [Means for solving the problem]

[0007] The present invention 1is a suspension device for suspending and transporting at least one block row in which a plurality of rectangular parallelepiped concrete blocks are lined up at once, the plurality of concrete blocks being lined up in the block row with their face shells in contact with each other, the suspension device comprising: a front-side arm and a rear-side arm that intersect with each other in a front view; and a center part that is arranged at an intersection of the front-side arm and the rear-side arm and rotatably integrates the front-side arm and the rear-side arm at the intersection, the front-side arm having a front-side hook portion provided at one end, a front-side first arm that extends from the front-side hook portion to the intersection, a front-side clamping portion provided at the other end via the intersection, and a front-side second arm that extends from the front-side clamping portion to the intersection, the rear-side arm having a rear-side hook portion provided at one end, a rear-side first arm that extends from the rear-side hook portion to the intersection, and a rear-side arm that is arranged at the other end via the intersection, a front-side clamping portion and a rear-side second arm portion extending from the rear-side clamping portion to the intersection portion, the front-side hook portion and the rear-side hook portion are hangers attached to the heavy machine, the front-side clamping portion has a front-side clamping portion extending in a hanging direction from the front-side second arm portion, the rear-side clamping portion has a rear-side clamping portion extending in a hanging direction from the rear-side second arm portion, and in conjunction with the front-side hook portion and the rear-side hook portion being displaced upward, a lower end of the front-side clamping portion moves in a direction perpendicular to the block. a clamping state in which the lower end of the back-side clamping portion contacts the face shell at one end of the block row, and the lower end of the back-side clamping portion contacts the face shell at the other end of the block row, and in the clamping state, in a front view, a front-side stress imaginary line extending from the lower end of the front-side clamping portion in a direction perpendicular to the front-side clamping portion passes over the face shell at the other end, and a back-side stress imaginary line extending from the lower end of the back-side clamping portion in a direction perpendicular to the back-side clamping portion passes over the face shell at the one end. In a non-clamping state before being displaced to the clamping state, the front side second arm portion and the rear side second arm portion are extended in a horizontal direction, and the front side first arm portion and the rear side first arm portion are extended while being curved in an oblique direction. It is characterized by the following. The suspension device of the present invention 2 is a suspension device for suspending and transporting at least one block row in which a plurality of rectangular parallelepiped concrete blocks are lined up at once, wherein the plurality of concrete blocks are lined up in the block row with their face shells in contact with each other, and the suspension device comprises a front arm and a rear arm that intersect with each other when viewed from the front, and a center part that is disposed at the intersection of the front arm and the rear arm and rotatably integrates the front arm and the rear arm at the intersection, and the front arm has one end a front side hook portion provided at one end, a front side first arm portion extending from the front side hook portion to the intersection portion, a front side clamping portion provided at the other end via the intersection portion, and a front side second arm portion extending from the front side clamping portion to the intersection portion, and the rear side arm has a rear side hook portion provided at one end, a rear side first arm portion extending from the rear side hook portion to the intersection portion, a rear side clamping portion provided at the other end via the intersection portion, and a rear side second arm portion extending from the rear side clamping portion to the intersection portion, and the front side hook portion and the rear side hook portion are attached to a heavy machine The front side clamping portion has a front side clamping portion extending downward from the front side second arm portion, and the back side clamping portion has a back side clamping portion extending downward from the back side second arm portion, and in conjunction with the front side hook portion and the back side hook portion being displaced upward, a clamping state is reached in which a lower end of the front side clamping portion comes into contact with a face shell at one end of the block row, and a lower end of the back side clamping portion comes into contact with a face shell at the other end of the block row, and in the clamping state, when viewed from the front, a front side imaginary stress line extending from the lower end of the rear side clamp portion in a direction perpendicular to the front side clamp portion passes over the face shell at the other end, and a rear side imaginary stress line extending from the lower end of the rear side clamp portion in a direction perpendicular to the rear side clamp portion passes over the face shell at one end, and a rotation limiting mechanism is provided which limits the rotation angle of the front side arm and the rear side arm with respect to a horizontal plane to a predetermined angle when the center part is suspended in the air without gripping the block row, and the rotation limiting mechanism is provided with a front side center part and a rear side center part which constitute the center part,The device is provided with a front-side anti-sway part that connects the front-side center part and the front-side first arm, and a rear-side anti-sway part that connects the rear-side center part and the rear-side first arm, wherein the front-side center part and the rear-side center part each have a vertical linear groove formed therein, one end of the front-side anti-sway part is rotatably fixed to the front-side first arm, and the other end of the front-side anti-sway part has a front-side regulating part that can move vertically along the linear groove depending on the rotation angle of the front-side arm, one end of the rear-side anti-sway part is rotatably fixed to the rear-side first arm, and the other end of the rear-side anti-sway part has a rear-side regulating part that can move vertically along the linear groove depending on the rotation angle of the rear-side arm, and when the front-side regulating part and the rear-side regulating part are positioned at the upper ends of the linear groove, the rotation angle of the front-side arm and the rear-side arm is positioned at the predetermined angle with respect to the horizontal plane. [Effects of the Invention]

[0008] According to the present invention, the force applied by the front clamp to one end of the face shell extends to the other end of the face shell, and the force applied by the rear clamp to the other end of the face shell extends to one end of the face shell. Because the clamping force of the front and rear clamps acts on all concrete blocks, concrete blocks near the center of the arrangement can be prevented from falling, and one or more rows of blocks can be clamped and lifted simultaneously. Therefore, by using a lifting device, rectangular parallelepiped concrete blocks can be transported efficiently. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a front view showing the suspension device in Example 1 suspending and transporting a plurality of rectangular parallelepiped concrete blocks. FIG. [Figure 2] FIG. 2 is a front view showing the suspension device in a non-clamping state. [Figure 3] FIG. 10 is a front view showing how the left and right handle parts can be selectively fixed in the hanging device. [Figure 4] FIG. [Figure 5] 4 is a cross-sectional view showing the suspension device, which corresponds to the cross section taken along the line AA in FIG. 3. FIG. [Figure 6] FIG. 2 is a front view showing the suspension device in a suspended state. [Figure 7] FIG. 4 is a cross-sectional view showing the suspension device, which corresponds to the cross section taken along the line BB in FIG. 3. [Figure 8] 4 is a cross-sectional view showing the suspension device, which corresponds to the cross section taken along the CC position in FIG. 3. FIG. [Figure 9] 4 is a cross-sectional view showing the suspension device in Example 2, which corresponds to the cross section taken along the line BB in FIG. 3. FIG. [Figure 10] 4 is a cross-sectional view showing the suspension device, which corresponds to the cross section taken along the CC position in FIG. 3. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0010] A preferred embodiment of the present invention is shown below. [1] The present invention provides a suspension device for suspending and transporting at least one row of blocks in which a plurality of rectangular parallelepiped concrete blocks are lined up at once, the plurality of concrete blocks being lined up in the row of blocks with their face shells in contact with each other, the suspension device comprising: a front-side arm and a rear-side arm that intersect with each other in a front view; and a center part that is disposed at the intersection of the front-side arm and the rear-side arm and rotatably integrates the front-side arm and the rear-side arm at the intersection, the front-side arm having a front-side hook portion provided at one end, a front-side first arm that extends from the front-side hook portion to the intersection, a front-side clamping portion provided at the other end via the intersection, and a front-side second arm that extends from the front-side clamping portion to the intersection, the rear-side arm having a rear-side hook portion provided at one end, a rear-side first arm that extends from the rear-side hook portion to the intersection, and a rear-side arm that is disposed at the other end via the intersection. and a rear-side second arm portion extending from the rear-side clamping portion to the intersection portion, the front-side hook portion and the rear-side hook portion are hangers attached to the heavy machine, the front-side clamping portion has a front-side clamping portion extending in a downward direction from the front-side second arm portion, the rear-side clamping portion has a rear-side clamping portion extending in a downward direction from the rear-side second arm portion, and in conjunction with the front-side hook portion and the rear-side hook portion being displaced upward, the lower end of the front-side clamping portion moves to both ends of the block row. The rear side clamping portion contacts the face shell at one end of the block row, and the lower end of the rear side clamping portion contacts the face shell at the other end of the block row, creating a clamped state.In this clamped state, when viewed from the front, a front side stress virtual line extending from the lower end of the front side clamping portion in a direction perpendicular to the front side clamping portion passes over the face shell at the other end, and a rear side stress virtual line extending from the lower end of the rear side clamping portion in a direction perpendicular to the rear side clamping portion passes over the face shell at one end.

[0011] With this configuration, the force applied by the front clamp to one end of the face shell extends to the other end of the face shell, and the force applied by the back clamp to the other end of the face shell extends to one end of the face shell. Because the clamping force of the front and back clamps acts on all of the concrete blocks, concrete blocks near the center of the arrangement can be prevented from falling, and one or more rows of blocks can be clamped and lifted simultaneously. Therefore, by using a lifting device, rectangular parallelepiped concrete blocks can be transported efficiently.

[0012] [2] In the suspension device described in [1] above, the front clamping portion and the rear clamping portion may hang down vertically in a non-clamping state before being shifted to the clamping state. With this configuration, the angle between the front clamping portion and the rear clamping portion in the clamping state can be made close to vertical, and the clamping force by the front clamping portion and the rear clamping portion can be applied to the block row at an angle close to horizontal.

[0013] [3] In the suspension device described in [1] or [2] above, in the clamping state, the lower end of the front clamping portion and the lower end of the back clamping portion may each contact a lower region of the face shell in the height direction. With this configuration, most of the clamping force by the front clamping portion and the back clamping portion can be applied to the lower region of the block row.

[0014] [4] In the suspension device described in any one of [1] to [3] above, in the non-clamping state before being shifted to the clamping state, the front-side second arm and the rear-side second arm may be configured to extend horizontally. With this configuration, the front-side second arm and the rear-side second arm can be placed on the upper surface of the block row in the non-clamping state, making it easy to set up the suspension device.

[0015] [5] In the suspension device described in any one of [1] to [4] above, the difference between the length of the front clamping portion and the rear clamping portion and the length of the row of blocks to be suspended and transported at one time may be 30 mm or less. With this configuration, force can be applied to the face shell more efficiently than when the length of the front clamping portion and the rear clamping portion is too larger or too smaller than the length of one or more rows of blocks to be suspended and transported at one time.

[0016] [6] In the suspension device described in any one of [1] to [5] above, in a suspended state in which the suspension device is suspended in the air without gripping the block row, a rotation limiting mechanism is provided that limits the rotation angle of the front side arm and the rear side arm with respect to a horizontal plane to a predetermined angle, and the rotation limiting mechanism includes a front side center part and a rear side center part that constitute the center part, a front side swing-stop part that connects the front side center part and the front side first arm part, and a rear side swing-stop part that connects the rear side center part and the rear side first arm part, and the front side center part and the rear side center part each have a linear groove part formed in the vertical direction, and One end of the front side anti-sway part is rotatably fixed to the front side first arm, and the other end of the front side anti-sway part has a front side regulating part that can move up and down along the linear groove part depending on the rotation angle of the front side arm, one end of the rear side anti-sway part is rotatably fixed to the rear side first arm, and the other end of the rear side anti-sway part has a rear side regulating part that can move up and down along the linear groove part depending on the rotation angle of the rear side arm, and when the front side regulating part and the rear side regulating part are positioned at the upper end of the linear groove part, the rotation angle of the front side arm and the rear side arm may be positioned at the predetermined angle with respect to the horizontal plane.

[0017] With this configuration, a rotation limiting mechanism that limits the rotation angle of the front arm and rear arm to a predetermined angle when suspended in mid-air can be realized with a simple structure, making the rotation limiting mechanism less susceptible to failure and improving the durability of the suspension device.

[0018] [7] In the suspension device described in any one of [1] to [6] above, the front clamping portion and the rear clamping portion may be made of handle parts formed separately from the front arm and the rear arm, and the front second arm and the rear second arm may be provided with a plurality of fixing portions to which the handle parts can be selectively fixed. With this configuration, rows of blocks with different widths can be clamped by selecting the fixing positions of the handle parts.

[0019] [8] In the hanging device described in [7] above, the pitch of the multiple fixing parts may be 40 mm or less. With this configuration, when carrying concrete blocks of different thicknesses, the difference between the horizontal distance between the lower ends of the front clamping part and the rear clamping part and the width of the row of blocks can be reduced in the non-clamped state before transitioning to the clamping state. This reduces the tilt angle of the clamping parts in the clamping state, allowing the clamping force of the front clamping part and the rear clamping part to be applied to the row of blocks at an angle close to horizontal.

[0020] [9] In the suspension device described in any one of [1] to [8] above, the lower ends of the front clamping portion and the rear clamping portion may have anti-slip portions. With this configuration, the front clamping portion and the rear clamping portion can effectively hold the face shells at both ends of the block row by frictional force.

[0021]

[10] In the suspension device described in any one of [1] to [9] above, the difference between the height of the front clamping portion and the rear clamping portion and the height of the block row may be 20 mm or less. With this configuration, in the clamped state, the lower ends of the front clamping portion and the rear clamping portion can be easily brought into contact with the lower region of the face shell.

[0022] Example 1 An embodiment of the present invention will be described in detail below with reference to FIGS. 1 to 8. FIG. 1 shows a hoisting device 10 in this embodiment hoisting and transporting a plurality of rectangular parallelepiped concrete blocks 100. As shown in FIG. 1, the plurality of rectangular parallelepiped concrete blocks 100 are hoisted and transported as a set of block rows 101. Each concrete block 100 is used for a block wall or the like, and may be, for example, a concrete formwork block or a hollow concrete block. The plurality of concrete blocks 100 are arranged in the block row 101 with their face shells 102 in contact with each other. The hoisting device 10 can hoist any type of concrete block 100, such as foundation blocks, horizontal reinforcement blocks, or corner blocks.

[0023] In the following description of each component, for convenience, the positive X-axis side shown in each drawing will be referred to as the front side, the negative X-axis side as the rear side, the positive Y-axis side as the top side, the negative Y-axis side as the bottom side, the positive Z-axis side as the left side, and the negative Z-axis side as the right side. Concrete blocks 100 are arranged with their length direction as the front-to-back direction, their height direction as the up-down direction, and their thickness direction as the left-to-right direction to form a block row 101. For convenience of explanation, some of the components may be exaggerated or simplified in each drawing. Furthermore, the dimensional proportions of each part may differ from the actual ones.

[0024] As shown in FIG. 1, the suspension device 10 includes a front-side arm 20, a rear-side arm 30, a center part 40, and a rotation limiting mechanism 60. The front-side arm 20 and the rear-side arm 30 intersect with each other when viewed from the front. The center part 40 is disposed at the intersection of the front-side arm 20 and the rear-side arm 30, and rotatably integrates the front-side arm 20 and the rear-side arm 30 at the intersection. The rotation limiting mechanism 60 limits the rotation angle of the front-side arm 20 and the rear-side arm 30 to a predetermined angle α when the front-side arm 20 and the rear-side arm 30 are suspended in the air without gripping the block row 101 (see FIG. 6).

[0025] The suspension device 10 can be in a suspended state (see Figure 6), a clamped state (see Figure 1) in which the lower ends of the left and right handle parts 23, 33 described later are in contact with the face shells 102 at both ends of the block row 101, and a non-clamped state (see Figure 2) before transitioning to the clamped state.

[0026] 1, the front side arm 20 includes a front side hook portion 21, a front side first arm portion 22, a left handle part (front side clamping portion) 23, a front side second arm portion 24, and a front side grip portion 25. The front side arm 20 is made of a metal plate having a thickness of about 9 mm to 12 mm.

[0027] The front side hook portion 21 is provided at the right end of the front side arm 20. The front side first arm portion 22 extends in a curved manner from the front side hook portion 21 to the center part 40. The left side handle part 23 is provided at the left end of the front side arm 20 (the other end via the intersection part). The front side second arm portion 24 extends in a straight line from the left side handle part 23 to the center part 40. The extension dimension of the front side second arm portion 24 is longer than the extension dimension of the front side first arm portion 22. The front side grip portion 25 is provided on the upper side of the front side second arm portion 24 and extends parallel to the front side second arm portion 24.

[0028] The rear-side arm 30 has the same shape as the front-side arm 20, but is a left-right inverted version of the front-side arm 20. The rear-side arm 30 includes a rear-side hook portion 31, a rear-side first arm portion 32, a right-side handle part (rear-side clamping portion) 33, a rear-side second arm portion 34, and a rear-side grip portion 35.

[0029] The rear side hook portion 31 is provided at the left end of the rear side arm 30, and the rear side first arm portion 32 extends in a curved manner from the rear side hook portion 31 to the center part 40. The right handle part 33 is provided at the right end of the rear side arm 30 (the other end via the intersection part). The rear side second arm portion 34 extends in a straight line from the right handle part 33 to the center part 40. The extension dimension of the rear side second arm portion 34 is longer than the extension dimension of the rear side first arm portion 32. The rear side grip portion 35 is provided on the upper side of the rear side second arm portion 34 and extends parallel to the rear side second arm portion 34.

[0030] An operator can lift the front arm 20 and the rear arm 30 by grasping the front grip portion 25 and the rear grip portion 35. The front grip portion 25 and the rear grip portion 35 are preferably rubber grips.

[0031] The front hook portion 21 and the rear hook portion 31 are hangers that are attached to heavy machinery. The front hook portion 21 and the rear hook portion 31 each have a circular hole formed therethrough.

[0032] Fig. 2 shows a front view of the suspension device 10 in a non-clamping state before being changed to the clamping state. As shown in Fig. 2, the front-side second arm 24 and the rear-side second arm 34 are extended horizontally in the non-clamping state. As a result, in the non-clamping state, the front-side second arm 24 and the rear-side second arm 34 are placed on the upper surface of the block row 101. The left-right length dimension of the front-side second arm 24 and the rear-side second arm 34 is a length dimension that allows approximately 5 to 12 concrete blocks 100 to be lifted and carried at a time.

[0033] Figure 3 shows how the left and right handle parts 23, 33 can be selectively fixed in the suspension device 10. In Figure 3, the handle parts 23, 33 at the position where the distance between the left and right handle parts 23, 33 is greatest are shown by solid lines, and the handle parts 23, 33 at the position where the distance is smallest are shown by dashed double-dashed lines.

[0034] The front-side arm 20 and the rear-side arm 30 are each formed with a plurality of handle fixing portions (fixing portions) 11 that can selectively fix the left and right handle parts 23, 33. This allows the fixing positions of the handle parts 23, 33 on the front-side arm 20 and the rear-side arm 30 to be changed.

[0035] Each handle fixing portion 11 is a circular hole formed through the front-side arm 20 and the rear-side arm 30. The handle fixing portions 11 of the front-side arm 20 are formed on the front-side second arm portion 24 at a constant pitch P in the left-right direction. The handle fixing portions 11 of the rear-side arm 30 are formed on the rear-side second arm portion 34 at a constant pitch P in the left-right direction.

[0036] The pitch P of the handle fixing portions 11 is preferably 40 mm or less. The pitch P of the handle fixing portions 11 may be changed depending on the specifications of the concrete blocks 100 to be transported. When transporting hollow concrete blocks of different thicknesses (specifically, thicknesses of 100 mm, 120 mm, 150 mm, and 190 mm), the pitch P of the handle fixing portions 11 is preferably 35 mm.

[0037] Fig. 4 shows an exploded front view of the suspension device 10. As shown in Fig. 4, the front-side arm 20 and the rear-side arm 30 are formed with first fixing portions 12 used for fixing to a front-side anti-sway part 63 and a rear-side anti-sway part 64, which will be described later. In addition, the front-side arm 20 and the rear-side arm 30 are formed with second fixing portions 13 used for fixing to the center part 40. Both the first fixing portion 12 and the second fixing portion 13 are circular through holes.

[0038] The center part 40 has a front-side center part 61 and a rear-side center part 62. The front-side center part 61 is disposed in front of the front-side arm 20, and the rear-side center part 62 is disposed behind the rear-side arm 30. The front-side center part 61 and the rear-side center part 62 are made of metal plate material with a thickness of about 9 mm to 12 mm. Both the front-side center part 61 and the rear-side center part 62 are triangular in front view.

[0039] A center grip portion 43 is provided on the rear center part 62. The center grip portion 43 extends horizontally. An operator can grasp the center grip portion 43 to lift the suspension device 10. The center grip portion 43 is preferably a rubber grip.

[0040] The front-side center part 61 and the rear-side center part 62 each have one upper fixing part 41 and two lower fixing parts 42. The upper fixing part 41 and the lower fixing parts 42 are both circular through holes.

[0041] The upper fixing parts 41 are provided on the upper ends of the front center part 61 and the rear center part 62. The front center part 61 and the rear center part 62 are connected to each other at the upper fixing parts 41 by fastening members T (see FIG. 5).

[0042] As shown in FIG. 4 , the lower fixing portions 42 are provided at both left ends of the lower ends of the front-side center part 61 and the lower-side center part 40. The front-side center part 61, the front-side arm 20, and the rear-side center part 62 are connected together by fastening a fastening member T to the lower fixing portion 42 on the left side of the front-side center part 61, the second fixing portion 13 of the front-side arm 30, and the lower fixing portion 42 on the left side of the rear-side center part 62. The front-side center part 61, the rear-side arm 30, and the rear-side center part 62 are connected together by fastening a fastening member T to the lower fixing portion 42 on the right side of the front-side center part 61, the second fixing portion 13 of the rear-side arm 30, and the lower fixing portion 42 on the right side of the rear-side center part 62. The fastening member T may be, for example, an M14 bolt or nut.

[0043] Fig. 5 shows a cross-sectional view of the suspension device 10 corresponding to the cross section taken along the line AA in Fig. 3. As shown in Fig. 5, the rotation limiting mechanism 60 includes a front-side center part 61, a rear-side center part 62, a front-side swing-stop part 63, a rear-side swing-stop part 64, a front-side restricting part 65, and a rear-side restricting part 66. The front-side restricting part 65 and the rear-side restricting part 66 are each formed by a single stepped pin 67.

[0044] A vertical linear groove 69 is formed through each of the front-side center part 61 and the rear-side center part 62 (see FIG. 4). The linear groove 69 is located at the center of the front-side center part 61 and the rear-side center part 62 in the left-right direction and extends vertically in the up-down direction. In this embodiment, the vertical dimension of the linear groove 69 is 80 mm, but this may be changed as appropriate depending on various conditions.

[0045] As shown in Figure 4, the front side anti-sway part 63 and the rear side anti-sway part 64 are metal plates with circular holes formed through them at both ends. The front side anti-sway part 63 and the rear side anti-sway part 64 have the same shape. The front side anti-sway part 63 connects the front side center part 61 and the front side arm 20. The rear side anti-sway part 64 connects the rear side center part 62 and the rear side arm 30.

[0046] The holes on one end of the front-side anti-sway part 63 and the rear-side anti-sway part 64 are anti-sway fixing parts 71. By inserting a pin into the anti-sway fixing part 71 of the front-side anti-sway part 63 and the first fixing part 12 of the front-side arm 20, the front-side anti-sway part 63 and the front-side arm 20 are rotatably fixed. By inserting a pin into the anti-sway fixing part 71 of the rear-side anti-sway part 64 and the first fixing part 12 of the rear-side arm 30, the rear-side anti-sway part 64 and the rear-side arm 30 are rotatably fixed.

[0047] The holes on the other end sides of the front side anti-sway part 63 and the rear side anti-sway part 64 are restricting and fixing parts 72 for fixing the front side restricting part 65 and the rear side restricting part 66 (see FIG. 5).

[0048] 5, the front-side restricting portion 65 and the rear-side restricting portion 66 are provided on a stepped pin 67. The stepped pin 67 has a stepped cylindrical shape integrally having the front-side restricting portion 65, the rear-side restricting portion 66, and a large-diameter portion 68. The diameter of the large-diameter portion 68 is larger than the diameters of the front-side restricting portion 65 and the rear-side restricting portion 66.

[0049] The front-side regulating portion 65 passes through the regulating and fixing portion 72 of the front-side swing-stop part 63 and is disposed in the linear groove portion 69. The rear-side regulating portion 66 passes through the regulating and fixing portion 72 of the rear-side swing-stop part 64 and is disposed in the linear groove portion 69. The front-side regulating portion 65 and the rear-side regulating portion 66 move up and down along the linear groove portion 69 according to the rotation angles of the front-side arm 20 and the rear-side arm 30.

[0050] FIG. 6 shows a front view of the suspension device 10 in a suspended state. In the suspended state, as shown in FIG. 6, the front-side restricting portion 65 and the rear-side restricting portion 66 are positioned at the upper ends of the linear groove portions 69. This restricts the rotation angle of the front-side arm 20 and the rear-side arm 30, and in the suspended state, they are positioned at a predetermined angle α with respect to the horizontal plane H. The predetermined angle α may be, for example, 10 to 30 degrees. The rotation limiting mechanism 60 has a simpler structure than conventional rotation limiting mechanisms, which have a complex structure equipped with a switch mechanism for turning the rotation angle restriction state on and off. This makes the rotation limiting mechanism 60 less prone to malfunction and improves the durability of the suspension device 10. Note that the front-side restricting portion 65 and the rear-side restricting portion 66 are positioned near the vertical center of the linear groove portions 69 in the clamped state and are positioned lower than that in the non-clamped state.

[0051] As shown in FIG. 4, the left and right handle parts 23, 33 are formed separately from the front-side arm 20 and the rear-side arm 30. Each handle part 23, 33 has a grip part 51, an attachment part 52, and an overhang part 53. The left and right handle parts 23, 33 have the same shape and are attached to the front-side arm 20 and the rear-side arm 30 in a mirror image. The left handle part 51 corresponds to the front-side grip part, and the right handle part 51 corresponds to the rear-side grip part. The handle parts 23, 33 are made of metal plate material with a thickness of approximately 6 mm to 9 mm.

[0052] As shown in Fig. 2, the clamping portion 51 extends downward from the front-side second arm 24 and the rear-side second arm 34 when the handle parts 22, 23 are fixed to the front-side arm 20 and the rear-side arm 30. The clamping portion 51 hangs vertically in the non-clamping state. This allows the tilt angle of the clamping portion 51 in the clamping state to be close to vertical, as shown in Fig. 1, and allows the clamping force of the left and right handle parts 23, 33 to be applied to the block row 101 at an angle close to horizontal.

[0053] The lower end of the grip part 51 has an anti-slip part 54. This allows the handle part to hold the face shells 102 at both ends of the block row 101 well by friction. The anti-slip part 54 is preferably formed using a plurality of metal square bars. This makes it easy to form the anti-slip part 54.

[0054] The protruding portion 53 protrudes horizontally along the lower edges of the front-side second arm portion 24 and the rear-side second arm portion 34 (see FIG. 8). In the non-clamped state, the protruding portion 53 is disposed along the upper surface of the block row 101 (see FIG. 2).

[0055] FIG. 7 shows a cross-sectional view of the suspension device 10 corresponding to the cross section at position BB in FIG. 3. As shown in FIG. 7, the clamping portion 51 has a rectangular shape that is long in the front-to-rear direction in a side view. The anti-slip portion 54 is provided over the entire length of the clamping portion 51 in the front-to-rear direction. The difference between the length dimension (front-to-rear dimension) D1 of the clamping portion 51 and the length dimension (front-to-rear dimension) of the block row 101 should be 30 mm or less. Specifically, for example, if the length dimension of the block row 101 is 380 mm, the length dimension D1 of the clamping portion 51 should be 390 mm. This allows for more efficient application of force to the face shell 102 than when the clamping portion 51 is too long or too short compared to the block row 101.

[0056] The difference between the height dimension (vertical dimension) D2 of the clamping portion 51 and the height dimension (vertical dimension) of the block row 101 is preferably 20 mm or less. Specifically, for example, if the height dimension of the block row 101 is 190 mm, the height dimension D2 of the clamping portion 51 is preferably 180 mm. This makes it easier for the lower end of the clamping portion 51 to abut against the lower end of the face shell 102 in the clamped state.

[0057] 8 shows a cross-sectional view of the suspension device 10 corresponding to the cross-section at position CC in FIG. 3. As shown in FIG. 8, the mounting portion 52 has a pair of metal plates that can clamp the front-side arm 20 and the rear-side arm 30, respectively. The mounting portion 52 is erected on the upper surface of the protruding portion 53. Four fixing holes 55 are formed in the mounting portion 52. Each fixing hole 55 is a circular hole that penetrates the two metal plates that make up the mounting portion 52 in the front-to-rear direction. The four fixing holes 55 are formed side by side in the left-to-right direction at intervals equal to the pitch P of the handle fixing portions 11.

[0058] The mounting portion 52 is fixed to the front arm 20 and the rear arm 30 by a fixing part 56 having three pins. The spacing between the pins of the fixing part 56 is equal to the pitch P of the handle fixing portion 11. By being fixed by the three pins of the fixing part 56, the handle parts 23, 33 are firmly fixed to the front arm 20 and the rear arm 30 without wobbling.

[0059] In a plan view, the protruding portion 53 has a triangular shape that is longer in the front-to-rear direction than in the left-to-right direction, and the dimension in the front-to-rear direction gradually decreases from the clamping portion 51 side toward the center part 40 side. The dimension in the left-to-right direction of the protruding portion 53 is equal to or slightly larger than the thickness dimension of the concrete block 100.

[0060] Next, an example of a transport operation of the concrete block 100 using the hanging device 10 will be described.

[0061] First, as shown in Figure 3, the worker selects the fixing positions of the handle parts 23, 33 and fixes the handle parts 23, 33 to the front arm 20 and the rear arm 30. The width dimension (left-right dimension) of the block row 101 varies depending on the standard and number of concrete blocks 100. By selecting the fixing positions of the handle parts 23, 33, the worker can reuse the hanging device 10 to lift and transport block rows 101 with different width dimensions.

[0062] The worker fixes the left and right handle parts 23, 33 in positions symmetrical to each other with respect to the center of the center part 40 in the left-right direction. The distance between the left and right grip parts 51 should be minimized relative to the width of the block row 101 to be carried. This makes the distance between the left and right grip parts 51 and the face shells 102 at both ends of the left and right ends equal to or less than the pitch P of the handle fixing parts 11.

[0063] The worker may adjust the fixing positions of the handle parts 23, 33 to the width dimension of the pallet on which the concrete blocks 100 are stacked. This allows the lifting device 10 to clamp, lift, and transport a row of concrete blocks 100 as a block row 101 from the concrete blocks 100 stacked on the pallet.

[0064] It is preferable that the block row 101 is made up of only concrete blocks 100 of the same standard, so that the hoisting device 10 can stably lift and transport the block row 101.

[0065] Furthermore, it is preferable that the block rows 101 are made up of the same type of concrete blocks 100. Specifically, for example, it is advisable to transport the blocks separately into a block row 101 made up of only basic concrete blocks 100 and a block row 101 made up of only horizontal reinforcement concrete blocks 100. This allows only the basic concrete blocks 100 to be lined up in a row at the stacking site, and only the horizontal reinforcement concrete blocks 100 to be lined up in a row, allowing for efficient stacking work such as for a block wall.

[0066] Next, as shown in FIG. 2, the worker sets the suspension device 10 in a non-clamped state on the block row 101 to be transported. Specifically, the worker uses heavy machinery or the like to lift the hook portion of the suspension device 10, which is suspended in mid-air, and positions it above the block row 101 to be transported. Next, the worker grasps and lifts the front-side grip portion 25 and the rear-side grip portion 35, horizontally positions the front-side second arm portion 24 and the rear-side second arm portion 34, and places the suspension device 10 on the top surface of the block row 101. This sets the suspension device 10 in a non-clamped state on the block row 101. At this time, each concrete block 100 in the block row 101 is freestanding, and the face shells 102 do not necessarily need to be in close contact with each other. The worker can set the suspension device 10 on the top surface of the block row 101 and release their hands, making it easy to set the suspension device 10.

[0067] Next, as shown in Figure 1, a worker lifts the suspension device 10 using heavy machinery or the like. As the front hook portion 21 and the back hook portion 31 are displaced upward, the left and right clamping portions 51 tilt, and the lower ends of the left and right clamping portions 51 come into contact with the face shells 102 at both left and right ends of the block row 101, pressing against the face shells 102 at both left and right ends. The pressing force from the left and right clamping portions 51 causes the face shells 102 of the concrete blocks 100 to come into close contact with each other, and the suspension device 10 enters a clamping state. In the clamping state, the tilt angle of the clamping portions 51 is small and is close to vertical.

[0068] In the clamping state, as viewed from the front, a front-side imaginary stress line L1 extending perpendicularly from the lower end of the left clamping section 51 (the lower end of the front-side clamping section) passes over the right-end face shell 102. As a result, the force applied by the left clamping section 51 to the left-end face shell 102 of the block row 101 extends to the right-end face shell 102 of the block row 101. In addition, a rear-side imaginary stress line L2 extending perpendicularly from the lower end of the right clamping section 51 (the lower end of the rear-side clamping section) passes over the left-end face shell 102. As a result, the force applied by the right clamping section 51 to the right-end face shell 102 of the block row 101 extends to the left-end face shell 102 of the block row 101. The clamping force by the left and right clamping sections 51 acts on all of the concrete blocks 100 that make up the block row 101.

[0069] The front side stress imaginary line L1 and the rear side stress imaginary line L2 are symmetrical with respect to the left-right center of the block row 101. This allows the clamping forces of the left and right clamping portions 51 to act on the block row 101 in a balanced manner.

[0070] In addition, in the clamping state, the lower ends of the left and right clamping sections 51 each come into contact with the lower ends of the face shell 102. As a result, more than half of the portions of the front-side stress virtual line L1 and the back-side stress virtual line L2 that extend into the block row 101 pass through the lower region U of the block row 101. The lower region U is the region below the center of the concrete block 100 in the height direction, and is shown by hatching in FIG. 1. Most of the clamping force of the left and right clamping sections 51 acts on the lower region U of the block row 101.

[0071] The worker further lifts the clamped suspending device 10 using heavy machinery or the like. Then, the suspending device 10 is suspended in mid-air while clamping the block row 101. The block row 101 is lifted without falling due to the clamping force of the left and right clamping parts 51.

[0072] With the lifting device 10 held up, the worker moves the heavy equipment to the location where the concrete blocks 100 are to be stacked. While the heavy equipment is moving, the lifting device 10 swings back and forth and side to side while clamping the block row 101. However, the block row 101 is firmly held by the clamping force of the left and right clamping parts 51, preventing it from falling.

[0073] The worker moves the heavy equipment to the stacking location for the concrete blocks 100 and then lowers the lifting device 10 into a predetermined location. The block row 101 is placed in a predetermined location and stands on its own, and the lifting device 10 is placed on the top surface of the block row 101 in an unclamped state. The worker grasps the front grip portion 25 and the rear grip portion 35 and slides the lifting device 10 forward or backward of the block row 101. The worker lifts the lifting device 10 with the heavy equipment and places it in a suspended state. The worker moves the heavy equipment close to the pallet and sets the lifting device 10 on the next block row 101 to be transported.

[0074] In this way, workers can easily transport a row of blocks 101 weighing about 100 kg, which would be difficult to carry manually at once, from the pallet to the stacking location using the lifting device 10. By using the lifting device 10, workers can reduce the strain on their bodies, and even a small number of people can efficiently transport the concrete blocks 100 in a short amount of time.

[0075] <Example 2> Next, a suspension device 90 according to a second embodiment of the present invention will be described with reference to Figures 9 and 10. The suspension device 90 of this embodiment differs from the first embodiment in that it can lift and transport two sets of block rows 101. The two sets of block rows 101 are arranged as close as possible to each other in the front and rear. Note that the same components as those in the first embodiment are designated by the same reference numerals, and redundant explanations will be omitted.

[0076] The suspension device 90 according to this embodiment is the suspension device 10 of the first embodiment, with the left and right handle parts 23, 33 replaced with handle parts 91, 91. The suspension device 90 includes a front arm 20, a rear arm 30, a center part 40, left and right handle parts 91, 91, and a rotation limiting mechanism 60.

[0077] The left and right handle parts 91, 91 are formed separately from the front-side arm 20 and the rear-side arm 30, as in the first embodiment, and each has a grip portion 92, an attachment portion 93, and an overhang portion 94. The attachment portion 93 has the same configuration as the attachment portion 52 in the first embodiment.

[0078] The dimensions in the front-rear direction of the clamping portion 92 and the overhanging portion 94 are approximately twice the dimensions in the front-rear direction of the clamping portion 51 and the overhanging portion 53 of Example 1. In a plan view, the overhanging portion 94 has a triangular shape that is longer and thinner in the front-rear direction than the overhanging portion 53 of Example 1.

[0079] Similar to the first embodiment, the clamping portion 92 has a rectangular shape that is long in the front-to-rear direction in side view. Similar to the first embodiment, the difference between the length dimension D1 of the clamping portion 92 and the length dimension of the two sets of block rows 101 is preferably 30 mm or less. Specifically, for example, if the length dimension of the two sets of block rows 101 is 780 mm, the length dimension D1 of the clamping portion 92 is preferably 800 mm. This allows the clamping portion 92 to apply force to the face shells 102 of the two sets of block rows 101 more efficiently than when the clamping portion 92 is too long or too short for the two sets of block rows 101 it carries, similar to the first embodiment.

[0080] The clamping portion 92 hangs down vertically in the non-clamping state, similar to Example 1. The difference between the height D2 of the clamping portion 92 and the height of the block row 101 is preferably 20 mm or less, similar to Example 1.

[0081] In this embodiment, as in the first embodiment, the clamping force of the left and right handle parts 91, 91 acts on all of the concrete blocks 100 in the two sets of block rows 101, preventing the concrete blocks 100 near the center of the arrangement from falling and enabling the two sets of block rows 101 to be simultaneously lifted and clamped. Therefore, by using the hanging device 90, the rectangular parallelepiped concrete blocks 100 can be transported more efficiently.

[0082] <Other Examples> The present invention is not limited to the embodiments described above and illustrated in the drawings, and the following embodiments are also included within the technical scope of the present invention. (1) The hanging devices 10, 90 in the above embodiments may be used to transport decorative blocks. (2) In the above embodiment, the gripping portions 51 (92) of the left and right handle parts 23, 33 (91, 91) hang down vertically in the non-clamped state. However, the gripping portions of the left and right handle parts may be inclined relative to the vertical in the non-clamped state as long as the conditions of the front-side stress virtual line L1 and the back-side stress virtual line L2 in the clamped state can be realized. (3) In the above embodiment, in the clamped state, the lower ends of the left and right handle parts 23, 33 (91, 91) each contact the lower region U in the height direction of the face shell 102. However, this is not limiting, and for example, when transporting a row of blocks with a small width (such as a small number of concrete blocks or thin concrete blocks), the lower ends of the left and right handle parts may contact the upper region U in the height direction of the face shell as long as the conditions of the front side stress virtual line L1 and the back side stress virtual line L2 in the clamped state can be realized. (4) In the above embodiment, in the non-clamped state, the front-side second arm 24 and the back-side second arm 34 extend horizontally. However, this is not limiting, and in the non-clamped state, the front-side second arm and the back-side second arm may extend obliquely upward from both the left and right ends toward the center part, or may be curved. (5) In the above embodiment, the difference between the length dimension D1 of the clamping portion 51 (92) and the length dimension of the row of blocks 101 to be suspended and transported at one time is 30 mm or less, but this length difference may be changed as appropriate depending on the size of the concrete blocks to be transported. (6) In the above embodiment, a specific configuration of the rotation limiting mechanism 60 has been described, but a rotation limiting mechanism with a different configuration may also be used. (7) In the above embodiment, the front-side clamping portion and the rear-side clamping portion are formed as handle parts 23, 33 (91, 91) separately from the front-side arm 20 and the rear-side arm 30, and the fixing positions of the handle parts 23, 33 (91, 91) are selectable. However, the front-side clamping portion and the rear-side clamping portion do not have to be formed as separate parts from the front-side arm and the rear-side arm, and may be provided at fixed positions on the front-side arm and the rear-side arm. [Explanation of symbols]

[0083] 10,90...Hanging device 11...Handle fixing part (fixing part) 20...Front arm 21...Front hook 22...Front side first arm part 23,91...Left handle part (front clamping part) 24...Front side second arm part 30...Rear arm 31…Back hook 32...First arm on the back side 33,91...Right handle part (rear clamp part) 34...Second arm on the back side 40...Center part 51,92...Pinch part (front side pinch part, back side pinch part) 54…Non-slip part 60...Rotation limiting mechanism 61...Front center part 62...Back center part 63...Front side stopper part 64...Back side stopper part 65...Front side restriction part 66...Rear side regulation part 69...Linear groove 100...Concrete block 101...Block row 102...Face shell α...predetermined angle D1: Length of the front and back clamps D2: Height of front and rear clamps H…Horizontal surface L1: Front side stress imaginary line L2: Virtual stress line on the rear side P...Pitch of the handle fixing part

Claims

1. A lifting device for lifting and transporting at least one block row in which a plurality of rectangular parallelepiped concrete blocks are arranged at once, wherein the plurality of concrete blocks are arranged in the block row with their face shells in contact with each other; a front arm and a rear arm that intersect with each other in a front view; a center part that is disposed at an intersection of the front arm and the rear arm and rotatably integrates the front arm and the rear arm at the intersection, the front side arm has a front side hook portion provided at one end, a front side first arm portion extending from the front side hook portion to the intersection portion, a front side clamping portion provided at the other end via the intersection portion, and a front side second arm portion extending from the front side clamping portion to the intersection portion, the rear side arm has a rear side hook portion provided at one end, a rear side first arm portion extending from the rear side hook portion to the intersection portion, a rear side clamping portion provided at the other end via the intersection portion, and a rear side second arm portion extending from the rear side clamping portion to the intersection portion, The front hook portion and the rear hook portion are suspension points attached to heavy equipment, The front side clamping portion has a front side clamping hand portion extending downward from the front side second arm portion, the rear side clamping portion has a rear side clamping portion extending downward from the rear side second arm portion, In conjunction with the upward displacement of the front-side hook portion and the rear-side hook portion, a clamping state is achieved in which a lower end portion of the front-side clamping portion contacts a face shell at one end of the block row, and a lower end portion of the rear-side clamping portion contacts a face shell at the other end of the block row, In the clamped state, when viewed from the front, a front-side stress imaginary line extending from a lower end of the front-side clamp portion in a direction perpendicular to the front-side clamp portion passes over the face shell at the other end, and a rear-side stress imaginary line extending from a lower end of the rear-side clamp portion in a direction perpendicular to the rear-side clamp portion passes over the face shell at the one end, A suspension device characterized in that, in a non-clamped state before being displaced to the clamped state, the front side second arm and the back side second arm extend horizontally, and the front side first arm and the back side first arm extend and curve in an oblique direction.

2. A lifting device for lifting and transporting at least one block row consisting of a plurality of rectangular parallelepiped concrete blocks at a time, wherein the plurality of concrete blocks are arranged in the block row with their face shells in contact with each other; a front arm and a rear arm that intersect with each other in a front view; a center part that is disposed at an intersection of the front arm and the rear arm and rotatably integrates the front arm and the rear arm at the intersection, the front side arm has a front side hook portion provided at one end, a front side first arm portion extending from the front side hook portion to the intersection portion, a front side clamping portion provided at the other end via the intersection portion, and a front side second arm portion extending from the front side clamping portion to the intersection portion, the rear side arm has a rear side hook portion provided at one end, a rear side first arm portion extending from the rear side hook portion to the intersection portion, a rear side clamping portion provided at the other end via the intersection portion, and a rear side second arm portion extending from the rear side clamping portion to the intersection portion, The front hook portion and the rear hook portion are suspension points attached to heavy equipment, The front side clamping portion has a front side clamping hand portion extending downward from the front side second arm portion, the rear side clamping portion has a rear side clamping portion extending downward from the rear side second arm portion, In conjunction with the upward displacement of the front-side hook portion and the rear-side hook portion, a clamping state is achieved in which a lower end portion of the front-side clamping portion contacts a face shell at one end of the block row, and a lower end portion of the rear-side clamping portion contacts a face shell at the other end of the block row, In the clamped state, when viewed from the front, a front-side stress imaginary line extending from a lower end of the front-side clamp portion in a direction perpendicular to the front-side clamp portion passes over the face shell at the other end, and a rear-side stress imaginary line extending from a lower end of the rear-side clamp portion in a direction perpendicular to the rear-side clamp portion passes over the face shell at the one end, a rotation limiting mechanism that limits the rotation angle of the front arm and the rear arm relative to a horizontal plane to a predetermined angle when the arm is suspended in the air without gripping the block row, The rotation limiting mechanism includes a front center part and a rear center part that configure the center part; a front side swing-stop part that connects the front side center part and the front side first arm part; a rear side swing-stop part that connects the rear side center part and the rear side first arm part, The front-side center part and the rear-side center part each have a vertical linear groove formed therein, One end of the front side swing-stop part is rotatably fixed to the front side first arm portion, and the other end of the front side swing-stop part has a front side regulating part that can move up and down along the linear groove portion according to the rotation angle of the front side arm, One end of the rear side swing-stop part is rotatably fixed to the rear side first arm portion, and the other end of the rear side swing-stop part has a rear side regulating part that can move up and down along the linear groove portion according to the rotation angle of the rear side arm, A suspension device characterized in that, when the front side regulating portion and the rear side regulating portion are positioned at the upper end of the linear groove portion, the rotation angle of the front side arm and the rear side arm is positioned at the specified angle with respect to the horizontal plane.

3. The suspension device according to claim 1 or 2, wherein the front clamping portion and the rear clamping portion hang down vertically in a non-clamping state before being changed to the clamping state.

4. 3. The suspension device according to claim 1, wherein in the clamping state, lower ends of the front clamping portion and the rear clamping portion each contact a lower region of the face shell in a height direction.

5. 3. The suspension device according to claim 1, wherein the difference between the length of the front clamping portion and the rear clamping portion and the length of the row of blocks suspended and transported at one time is 30 mm or less.

6. the front side clamping portion and the rear side clamping portion are made of handle parts formed separately from the front side arm and the rear side arm, The suspension device according to claim 1 or 2, wherein the front-side second arm portion and the rear-side second arm portion are provided with a plurality of fixing portions that can selectively fix the handle parts.

7. 7. The suspension device according to claim 6, wherein the pitch of the plurality of fixing portions is 40 mm or less.

8. 3. The suspension device according to claim 1, wherein lower ends of the front clamping portion and the rear clamping portion have anti-slip portions.

9. 3. The suspension device according to claim 1, wherein a difference between a height dimension of the front side clamping portion and the rear side clamping portion and a height dimension of the block row is 20 mm or less.

Images