Container hoisting accessory

Abstract

To provide a container hoisting accessory capable of easily mounting a portal arm suspended from a hoisting machine on a container.SOLUTION: This container hoisting accessory 10 is provided with a portal arm 1 formed of a horizontal member 11 connecting upper parts of two vertical members 12, 13, a locking part 2 locked to a lower hook of a hoisting machine, and an engaging part 3 engaged with two side walls C1 and C2 so that the container C can be reversed and provided on the two vertical members 12, 13. At least one of the engaging portions 3 provided on the longitudinal members 12 and 13 is a locking engaging portion 50 having a holding plate 54 that abuts against the outer surface of the C1 of the sidewall and extends from the upper surface to the inner surface to hold the C1 of the sidewall, and a locking portion 55 that is constantly biased toward the inside of the gate-shaped arm 1 and holds the container C together with the holding plate 54, and the locking engaging portion 50 is locked by inserting the locking portion 55 into the C1a of the through hole from the outside.SELECTED DRAWING: Figure 2

Description

[Technical Field]

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

[0002] Patent Document 1 discloses that a gantry arm that is suspended from the lower hook of a hoist and can be hoisted up and down by the hoist is engaged with both ends of a container that stores cargo. The container can be turned over around an axis that is a straight line connecting both lower ends of the gantry arm by an operator operating a handle attached to the gantry arm.

[0003] The engagement between the gantry arm and the container consists of a container holder and a container retaining plate. The container holder abuts against the underside of the container's flange to support the container from vertically below. The container retaining plate is attached to the gantry arm so that it and the container holder sandwich the container's flange. The container is attached by inserting it into the container holder from a horizontal direction perpendicular to the direction connecting the two lower ends of the gantry arm. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2023-036104 [Patent Document 2] Patent No. 6483298 Summary of the Invention [Problem to be solved by the invention]

[0005] In the technology disclosed in Patent Document 1, when engaging a container with a gate-shaped arm, the container needs to be slid horizontally so that the flange formed on the periphery of the container and supported from below by the container holder is sandwiched between the container holder and the container pressing plate, making the operation of engaging the container with the gate-shaped arm cumbersome.

[0006] In addition to the above-mentioned containers, containers that are roughly rectangular parallelepipeds with only the top open and two opposing side surfaces with through-holes that allow workers to reach in and grasp the container may also be used as containers for storing cargo. In this case, it is conceivable to hold the container by clamping the upper sides of the container with both lower ends of the above-mentioned gate-shaped arms and inserting support members into the through-holes to hold the container, but the operation of engaging such a container with the gate-shaped arms is cumbersome.

[0007] Furthermore, Patent Document 2 discloses a hoisting device that includes a main frame, a pair of arms that are attached to the main frame in a manner that allows them to move freely toward and away from each other, and an arm drive mechanism that can drive the pair of arms to move toward and away from each other. However, with this hoisting device, the pair of arms must be slid each time a container is gripped or released. Therefore, the operation of gripping and releasing the same container repeatedly is cumbersome.

[0008] The present invention has been made in consideration of the above circumstances, and has an object to provide a rotatable container hoisting device that allows a portal arm suspended from a hoist to be easily attached to a container. [Means for solving the problem]

[0009] A container hoisting device according to one aspect of the present invention comprises a portal arm formed from two vertical members and a horizontal member connecting the upper parts of the vertical members; a locking portion provided on the horizontal member for locking onto a lower hook of a hoist; and engaging portions provided on each of the two vertical members for engaging with the two side walls so as to enable a container to be inverted, the container containing cargo and having through holes in the two opposing side walls for gripping by an operator. At least one of the engaging portions provided on the vertical members is a locking type engaging portion having a holding plate that abuts the outer surface of the side wall and extends from the upper surface to the inner surface of the side wall to hold the side wall, and a locking portion that is constantly biased inward of the portal arm and holds the container together with the holding plate. The locking type engaging portion is locked when the locking portion is inserted from the outside into the through hole. [Effects of the Invention]

[0010] According to the present invention, it is possible to provide a rotatable container lifting device that allows a portal arm suspended from a hoist to be easily attached to a container. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a perspective view showing the configuration of a container hoisting device according to this embodiment. [Figure 2] FIG. 2 is a front view showing the configuration of the container hoisting device according to this embodiment. [Figure 3] FIG. 3 is an enlarged view of the area surrounded by the dashed line A in FIG. [Figure 4] 4 is a perspective view showing a locking engagement portion of the container hoisting device shown in FIG. [Figure 5] 5 is a cross-sectional view showing a locking engagement portion of the container hoisting device shown in FIG. [Figure 6] FIG. 6 is a partially enlarged view showing the locking engagement portion of the container hoisting device shown in FIG. [Figure 7] FIG. 7 is an enlarged view of the area surrounded by the dashed line B in FIG. [Figure 8] 8 is a perspective view showing a rotary engaging portion of the container hoisting device shown in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, the container hoisting device 10 according to this embodiment will be described with reference to the drawings.

[0013] Fig. 1 is a perspective view showing the configuration of a container hoisting device 10 according to this embodiment. Fig. 2 is a front view showing the configuration of a container hoisting device 10 according to this embodiment. In the following description, "one end side" refers to the right side on the paper, and "the other end side" refers to the left side on the paper.

[0014] [structure] (Container lifting equipment) The container hoisting device 10 includes a portal arm 1, a locking portion 2, and an engaging portion 3.

[0015] The container C suspended by the container hoisting device 10 is a substantially rectangular parallelepiped with only the top open, capable of accommodating cargo inside. The container C has through-holes C1a, C2a in at least two opposing side walls C1, C2, which allow workers to grasp the container C. The through-holes C1a, C2a are preferably oblong holes to ensure ease of operation for workers, but may have other shapes.

[0016] When the portal arm 1 is holding a container C as shown in Figure 1, it has a horizontal member 11 extending in a substantially horizontal direction, a first vertical member 12 erected in a substantially vertical direction and connected to one end of the horizontal member 11, and a second vertical member 13 connected to the other end of the horizontal member 11.

[0017] The locking portion 2 is fixed to the upper portion of the cross member 11 near the center between the two end arms. The locking portion 2 is an eye portion that is locked to the lower hook of a hoist (not shown). This allows the container hoisting device 10 to raise and lower the container C to be hoisted in response to the hoisting of a wire rope, chain, or the like by the hoist.

[0018] The locking portion 2 is slidably connected to a slide rail 21 formed in the extension direction on the upper part of the cross member 11. As a result, the locking portion 2 can be slid on the slide rail 21 and fixed in the desired position with a bolt, thereby adjusting the balance of the inclination of the container hoisting device 10.

[0019] The engaging portion 3 has a locking engaging portion 50 connected to the lower portion of the first vertical member 12, and a rotatable engaging portion 70 connected to the lower portion of the second vertical member 13. The locking engaging portion 50 and the rotatable engaging portion 70 are engaged with the side walls C1, C2 of the container C to rotatably hold the container C.

[0020] The first vertical member 12 of the portal arm 1 has an upper end fixed to the horizontal member 11 in a state where it cannot move relative to the horizontal member 11, and has a locking engagement part 50 on its lower side, which engages with the side wall C1 of the container C. The first vertical member 12 has a handle 12a on the side opposite the second vertical member 13 that can be grasped by an operator.

[0021] The upper end of the second vertical member 13 of the portal arm 1 is not connected to the horizontal member 11, but is connected by a diagonal member 13b that connects a point slightly below the upper end to a point slightly toward the other end of the horizontal member 11. The lower end of the diagonal member 13b is fixed in a state where it cannot move relative to the second vertical member 13, and the upper end of the diagonal member 13b is connected to the horizontal member 11 via a rotation axis 14 whose axis is perpendicular to the extension direction of the horizontal member 11 and the extension direction of the second vertical member 13.

[0022] This allows the second vertical member 13 to rotate around the pivot axis 14 toward the outside of the gantry arm 1 (counterclockwise in Figure 1), and also rotate around the pivot axis 14 toward the inside of the gantry arm 1 (clockwise in Figure 1).

[0023] In particular, since the pivot shaft 14 is provided closer to the locking portion 2 of the horizontal member 11 than above in the extension direction of the second vertical member 13, when the portal arm 1 is suspending the container C, a clockwise moment acts on the second vertical member 13 around the pivot shaft 14. This makes it difficult for the holding portion 75, which will be described later, to come out of the through-hole C2a.

[0024] On the other hand, a pin 15 is inserted horizontally from the same direction into the second vertical member 13 and the horizontal member 11 above the diagonal member 13b of the second vertical member 13 and near the other end of the horizontal member 11, and fixed thereto, and a wire 16 is looped between the two pins 15, connecting the second vertical member 13 and the horizontal member 11.

[0025] Therefore, the second vertical member 13 is prevented from rotating excessively toward the inside of the portal arm 1. The limit angle of rotation of the second vertical member 13 toward the inside of the portal arm 1 is set to an angle at which the angle between the second vertical member 13 and the horizontal member 11 is slightly smaller than a right angle.

[0026] In addition, the second vertical member 13 has a handle 13a that can be held by an operator on the side opposite the side approaching the first vertical member 12, and a holder 5 that holds a remote controller 4 (hereinafter simply referred to as "remote control 4") that has a button 4a for operating the winding up and down of the hoist.

[0027] (Lock-type engagement part) Here, the locking engagement portion 50 of the portal arm 1 will be described.

[0028] Fig. 3 is an enlarged view showing an area surrounded by a dashed line in Fig. 2. Fig. 4 is a perspective view showing the locking engagement portion 50 of the container hoisting device 10 shown in Fig. 3. Fig. 5 is a cross-sectional view showing the locking engagement portion of the container hoisting device shown in Fig. 3. Fig. 6 is a partial enlarged view showing the locking engagement portion of the container hoisting device shown in Fig. 3.

[0029] The locking engagement portion 50 includes a first support portion 52 , a first inverted portion 53 , a holding plate 54 , and a lock portion 55 .

[0030] The first support part 52 is a hollow member fixed at one end to the vicinity of the lower end of the first vertical member 12 and at the other end to a holding plate 54 that holds the container C (FIG. 5). In other words, the weight of the container C is applied to the first vertical member 12 via the first support part 52.

[0031] The first reversing unit 53 has a first reversing shaft 53a inserted through the hollow portion of the first support unit 52 and a bearing 53b that slidably supports the first reversing shaft 53a within the hollow portion. The first reversing unit 53 extends from the first vertical member 12 to the holding plate 54 in a direction parallel to the horizontal member 11. This allows the container C to be turned integrally with the first reversing shaft 53a via the holding plate 54.

[0032] The first reversing portion 53 further includes a first contact plate 56 and a first plunger 57 .

[0033] The first abutment plate 56 is a plate-like member formed in an arc shape concentric with the first reversing shaft 53a. The first plunger 57 is fixed at a position where its tip can abut against the first abutment plate 56 regardless of the reversing angle of the container C. The first plunger 57 is fixed to the first vertical member 12 together with the first reversing part 53. The first abutment plate 56 is fixed to the flange part of the first support part 52, and due to this fixation, the first abutment plate 56 is provided in a state parallel to the holding plate 54.

[0034] The first abutment plate 56 has a first hole 56a into which the tip of the first plunger 57 fits when the lock-type engagement portion 50 is engaged with the container C, and a second hole 56b into which the tip of the first plunger 57 fits when the container C is at its inversion limit angle. A ball (not shown) at the tip of the first plunger 57 always abuts against the first abutment plate 56, and when it fits in the first hole 56a and the second hole 56b, further inversion of the container C is prevented. In other words, the container C can only be inverted between the angle at which the tip of the first plunger 57 fits in the first hole 56a and the angle at which it fits in the second hole 56b.

[0035] Furthermore, the first hole 56a is a through-hole that penetrates the first contact plate 56, and the second hole 56b is a shallow hole that does not penetrate the first contact plate 56. As a result, when the container C is at an initial angle where it is not tilted, the tip of the first plunger 57 penetrates the first contact plate 56, and therefore the container C will not invert unless an operator manually pulls out the first plunger 57. On the other hand, when the container C is tilted to the inversion limit angle and the tip of the first plunger 57 is engaged in the second hole 56b, the operator can manually invert the container C in the returning direction, causing the tip of the first plunger 57 to ride up through the second hole 56b, thereby enabling the container C to invert.

[0036] The holding plate 54 has a plate portion 54a that abuts against the side wall C1 of the container C over a large area (for example, more than half of the side wall C1). The holding plate 54 also has a hook portion 54b that bends from the plate portion 54a at its upper portion. The hook portion 54b extends horizontally from the portion that abuts against the side wall C1 of the container C toward the inside of the portal arm 1 and also extends downward (FIG. 3). This allows the hook portion 54b to engage with the upper edge of the side wall C1. The horizontal length of the hook portion 54b of the holding plate 54 is approximately the same as or slightly greater than the thickness of the side wall C1. As described above, the holding plate 54 is a flat plate overall, and only its upper portion is shaped so that it can fit into the upper portion of the side wall C1 of the container C. When the holding plate 54 is attached to the container C, as shown in FIG. 3, it abuts against the outer surface of the side wall C1 and extends from the upper surface to the inner surface of the side wall C1 to hold the side wall C1.

[0037] The locking portion 55 has a support shaft 55a fixed to the holding plate 54, a locking plate 58 that rotates around the support shaft 55a in the direction of contacting the holding plate 54, and a coil spring 59 that is arranged on the support shaft 55a and constantly biases the locking plate 58 toward the holding plate 54.

[0038] 6, the support shaft 55a is provided so as to be rotatable about an axis that is parallel to the surface of the holding plate 54 and perpendicular to the extension direction of the first vertical member 12. This support shaft 55a is rotatably attached to a pivotal support member 60 that is fixed to the holding plate 54. The pivotal support member 60 is disposed opposite to a bearing bent portion 61a of a connecting plate 61 that is connected to the back side of the lock plate 58, and is inserted into insertion holes (reference numerals omitted) formed in the pivotal support member 60 and the bearing bent portion 61a.

[0039] The locking plate 58 is a plate-like member connected to the holding plate 54 side by screws or the like so as to sandwich the connecting plate 61 between the locking plate 58 and the holding plate 54. The upper part of the locking plate 58 is pressed against the holding plate 54 by the biasing force of a coil spring 59. When the locking plate 58 is pressed against the holding plate 54, the locking plate 58 is inclined relative to the holding plate 54 so that the lower end side is separated from the holding plate 54 and the upper end side is in contact with the holding plate 54.

[0040] A protrusion 62 that protrudes toward the inside of the container C is attached to the locking plate 58 immediately below the position where it abuts against the upper holding plate 54. The protrusion 62 is formed in a generally triangular shape, extending horizontally from the locking plate 58 toward the container C and then bending diagonally downward to extend toward the locking plate 58. When the locking plate 58 is in a position where it abuts against the holding plate 54, the protrusion 62 is inserted into the through-hole C1a of the container C (FIG. 1).

[0041] The locking plate 58 has a release lever 58a that extends obliquely upward from a position where it abuts against the upper holding plate 54 toward the first vertical member 12. When an operator operates the release lever 58a and the locking plate 58 rotates in a direction away from the container C against the biasing force of the coil spring 59, the protrusion 62 comes out of the through-hole C1a (FIG. 1), and the lock on the container C by the locking plate 58 is released.

[0042] (Rotating engagement part) Next, the rotary engagement portion 70 of the portal arm 1 will be described.

[0043] Fig. 7 is an enlarged view showing an area surrounded by a dashed line B in Fig. 2. Fig. 8 is a perspective view showing the rotary engaging portion 70 of the container hoisting device 10 shown in Fig. 7.

[0044] The pivotable engagement part 70 has a second support part 72, a second reversing part 73, an abutment plate 74, and a holding part 75. The structures of the second support part 72 and the second reversing part 73 are generally the same as those of the first support part 52 and the first reversing part 53 of the locking engagement part 50, so they will be described without showing them in the drawings.

[0045] The second support part 72 is a hollow member having one end fixed to the vicinity of the lower end of the second vertical member 13 and the other end fixed to an abutment plate 74 that abuts against the container C. In other words, the weight of the container C is applied to the second vertical member 13 via the second support part 72.

[0046] The second reversing unit 73 has a second reversing shaft 73a inserted through the hollow portion of the second support unit 72 and a bearing (not shown) that slidably supports the second reversing shaft 73a within the hollow portion. The second reversing unit 73 extends from the second vertical member 13 to the abutment plate 74 in a direction parallel to the horizontal member 11. As a result, the container C is turned integrally with the second reversing shaft 73a via the abutment plate 74.

[0047] The second reversing portion 73 further includes a second abutment plate 76 and a second plunger 77 .

[0048] The second abutment plate 76 is a plate-like member formed in an arc shape concentric with the second reversing shaft 73a. The second plunger 77 is fixed in a position where its tip can abut against the second abutment plate 76 regardless of the reversing angle of the container C. The second plunger 77 is fixed to the second vertical member 13 together with the second reversing part 73. In addition, the second abutment plate 76 is fixed to the flange part of the second support part 72, and due to this fixation, the second abutment plate 76 is provided in a state parallel to the abutment plate 74.

[0049] The second abutment plate 76 has a first hole 76a into which the tip of the second plunger 77 fits when the rotary engagement portion 70 is engaged with the container C, and a second hole 76b into which the tip of the second plunger 77 fits when the container C is at its inversion limit angle. A ball (not shown) at the tip of the second plunger 77 always abuts against the second abutment plate 76, and when it fits in the first hole 76a and the second hole 76b, further inversion of the container C is prevented. In other words, the container C can only be inverted between the angle at which the tip of the second plunger 77 fits in the first hole 76a and the angle at which it fits in the second hole 76b.

[0050] Furthermore, in the pivotable engagement unit 70, like the first abutment plate 56 in the locking engagement unit 50, the first hole 76a may be a through-hole that penetrates the second abutment plate 76, and the second hole 76b may be a shallow hole that does not penetrate the second abutment plate 76. Alternatively, a ball plunger may be used that can release the tip of the second plunger 77 from the first hole 76a and the second hole 76b without the need for a release operation by an operator when the container C is at an initial angle where the container C is not tilted. In this case, even if the tip of the second plunger 77 is engaged with the first hole 76a that corresponds to the initial angle of the container C when the operator is working to invert the container C, the operator can manually invert the container C by simply performing an operation to release the first plunger 57, without operating the second plunger 77.

[0051] The abutment plate 74 is a plate-shaped member that abuts against the outer surface of the side wall C2 of the container C when the second vertical member 13 rotates toward the container C. The abutment plate 74 rotates around the rotation shaft 14 and abuts against the outer surface of the side wall C2 of the container C, as shown in FIG.

[0052] The holding portion 75 is formed such that a portion of the upper portion of the contact plate 74 is bent toward the container C and protrudes horizontally. The holding portion 75 is inserted into the through-hole C2a when the contact plate 74 rotates and abuts against the side wall C2 of the container C. With the holding portion 75 inserted into the through-hole C2a, the tip of the holding portion 75 is positioned inside the inner surface of the side wall C2 of the container C ( FIG. 7 ). Furthermore, a protruding portion 75a that protrudes upward is formed on a portion of the tip of the holding portion 75 that is inside the side wall C2. This prevents the holding portion 75 from coming out of the through-hole C2a after the holding portion 75 is inserted into the through-hole C2a and the load of the container C is applied.

[0053] [Effect] Next, the operation of the container hoisting device 10 according to this embodiment will be described.

[0054] The starting state is when the container C is placed on a flat surface such as a floor or workbench, a hoist is fixed above the container C by a beam or the like, and the lower hook of the hoist holds the container hoisting device 10 in a suspended state via the locking part 2. The worker operates the button 4a on the remote control 4 of the container C to lower the lower hook of the hoisting device and lower the container hoisting device 10 above the container C.

[0055] The worker grasps the handle 13a of the second vertical member 13 and rotates it slightly in the direction in which the second vertical member 13 moves away from the first vertical member 12, i.e., in the direction in which the portal arm 1 opens. In this state, the worker lowers the container hoisting device 10 and, while grasping the handle 12a, hooks the upper part of the holding plate 54 of the locking engagement part 50 onto the upper part of the side wall C1 of the container C. At this time, the protrusion 62 of the locking plate 58 of the locking part 55 slides on the outer surface of the side wall C1 of the container C, and when it is lowered to the position of the through-hole C1a in the side wall C1, the protrusion 62 is inserted into the through-hole C1a by the biasing force of the coil spring 59.

[0056] The side wall C1 of the container C is restricted from moving upward and along the first reversal shaft 53a by the holding plate 54, and is restricted from moving downward and in a direction perpendicular to the first vertical member 12 and parallel to the side wall C1 by the protrusion 62. Therefore, by inserting the protrusion 62 into the through-hole C1a, the movement of the container C is restricted.

[0057] Next, the worker releases the handle 12a that he had been holding and rotates the handle 13a in a direction in which the second vertical member 13 approaches the first vertical member 12, i.e., in a direction in which the portal arm 1 closes. At this time, the worker rotates the second vertical member 13 until the abutment plate 74 abuts against the outer surface of the side wall C2 of the container C. This causes the holding portion 75 to be inserted into the through-hole C2a (FIG. 7).

[0058] The movement of the side wall C2 of the container C on the first reversing shaft 53a in the direction from the first vertical member 12 to the second vertical member 13 is restricted by the abutment plate 74, and the movement of the side wall C2 in the up-down direction and in a direction perpendicular to the second vertical member 13 and parallel to the side wall C2 is restricted by the holding part 75. Therefore, by inserting the holding part 75 into the through-hole C2a, the movement of the container C is restricted.

[0059] The second vertical member 13 can rotate around the pivot axis 14, but when a load is applied from the side wall C2 of the container C while the holding portion 75 is inserted into the through hole C2a, the raised portion 75a of the holding portion 75 gets caught inside the side wall C2, so that the holding portion 75 will not come out even if a force is applied in a direction that causes the holding portion 75 to come out of the through hole C2a.

[0060] Furthermore, as mentioned above, when the portal arm 1 is suspending the container C, a clockwise moment acts on the second vertical member 13 around the pivot axis 14, which more reliably prevents the holding portion 75 from coming loose.

[0061] In this way, when the container C engages with the first vertical member 12 and the second vertical member 13 by the locking engagement parts 50 and the rotating engagement parts 70, the worker operates the button 4a on the remote control 4 to wind up the lower hook of the hoist. Because the container C is held by the locking engagement parts 50 and the rotating engagement parts 70 from both horizontal sides, it can maintain a stable suspended state.

[0062] Thereafter, the worker can invert the suspended container C around the first inversion shaft 53a and the second inversion shaft 73a, for example, by releasing the first plunger 57 and the second plunger 77 of the locking engagement part 50 and the rotating engagement part 70 at a predetermined height. In this case, when the container C is inverted and the tips of the first plunger 57 and the second plunger 77 fit into the second holes 56b and 76b, further inversion of the container C is prevented. Therefore, the positions of the second holes 56b and 76b of the first abutment plate 56 and the second abutment plate 76 are set in advance so that inversion of the container C is stopped at a desired rotation angle during the inversion operation of the container C.

[0063] A worker can also perform the task of dumping cargo from a container C held at a predetermined inversion angle into another container. For such tasks, the operation mode of the hoist may be set to float mode. In float mode, when the worker does not apply force, the container C does not rise or fall but remains suspended in mid-air, and the worker can raise or lower the container C simply by applying vertical force to the suspended container C. Therefore, when performing the task of inverting a container C as described above, workability can sometimes be improved by combining the operation with float mode.

[0064] Conversely, after the worker has completed the work of inverting and discharging the cargo in the container C, he releases the first plunger 57 and the second plunger 77 to invert the angle of the container C to the angle at the start of the work. When the tips of the first plunger 57 and the second plunger 77 fit into the first holes 56a, 76a of the first abutment plate 56 and the second abutment plate 76, the inversion of the container C is prevented. Thereafter, the worker operates the button 4a on the remote control 4 to move the container hoisting device 10 to the desired position, and lowers the container C onto flat ground or the like.

[0065] The worker operates the handle 13a of the second vertical member 13 to rotate the second vertical member 13 in the direction to open the gate-shaped arm 1. At this time, because the container C is placed on a flat surface or the like, the holding portion 75 is biased downward within the through-hole C2a of the side wall C2 due to the weight of the rotatable engagement portion 70. Therefore, when the rotatable engagement portion 70 is rotated in the direction to open the gate-shaped arm 1, the raised portion 75a of the holding portion 75 does not get caught in the through-hole C2a.

[0066] The worker rotates the second vertical member 13 sufficiently to remove the holding portion 75 of the rotary engagement portion 70 from the through-hole C2a, and then rotates the release lever 58a of the locking plate 58 in a direction away from the container C against the biasing force of the coil spring 59. As a result, the protruding portion 62 of the locking plate 58 rotates together with the locking plate 58 toward the first vertical member 12 and comes out of the through-hole C1a of the container C, and the lock on the container C by the locking plate 58 is released.

[0067] In this state, the worker raises the container hoisting device 10 by operating the button 4a on the remote control 4. Because the holding plate 54 is only lightly fitted into the upper part of the side wall C1 of the container C, it is released upward from the container C as the container hoisting device 10 is raised. In addition, the worker releases his / her hand from the release lever 58a when the protruding portion 62 of the locking plate 58 rises above the through-hole C1a of the side wall C1, and also releases his / her hand from the handle 13a of the rotatable engagement portion 70 when the abutment plate 74 of the rotatable engagement portion 70 rises above the container C.

[0068] This completes the series of operations of the container hoisting device 10.

[0069] [Variations] In the above embodiment, one of the portal arms 1 is the first vertical member 12 and the other is the second vertical member 13, but both may be the first vertical members 12. In this case, there is an effect that the portal arm structure can be simplified by the absence of the second vertical member 13, but the tolerance for variation in the length of the container C that can be suspended by the container hoisting device 10 in the direction of the horizontal member 11 is higher when the second vertical member 13 is used.

[0070] In the above embodiment, the first plunger 57 and the second plunger 77 are used, but the type thereof is not important as long as the tip of the plunger can roll or slide on the first abutment plate 56 and the second abutment plate 76 to fit into the first holes 56a, 76a and the second holes 56b, 76b and can be released by manual operation, such as a ball plunger, a spring plunger, an index plunger, etc.

[0071] In the above embodiment, the coil spring 59 is disposed on the support shaft 55a and is used to constantly urge the lock plate 58 toward the holding plate 54, but other urging members may be used as long as they can constantly urge the lock plate 58 toward the holding plate 54.

[0072] [Supplementary explanation of the embodiment] The above-described embodiments each show a preferred specific example of the present invention. The numerical values, components, arrangement positions of the components, order of connection, etc. shown in the above-described embodiments are merely examples and are not intended to limit the present invention. Furthermore, the drawings are not necessarily strict illustrations.

[0073] Although the embodiments of the present invention have been described above, the above embodiments merely illustrate some of the application examples of the present invention, and it is not intended that the technical scope of the present invention be limited to the specific configurations of the above embodiments.

[0074] [Note] The contents of the above-described embodiments can be understood, for example, as follows.

[0075] (1) Locking engagement part The container hoisting device 10 comprises a portal arm 1 formed of two vertical members 12, 13 and a horizontal member 11 connecting the upper portions of the vertical members 12, 13, a locking portion 2 provided on the horizontal member 11 and locked to a lower hook of a hoist, and engagement portions 3 provided on each of the two vertical members 12, 13, which are engaged with the two side walls C1, C2 so as to be able to turn over a container C that contains cargo and has through holes C1a, C2a in the two opposing side walls C1, C2 for an operator to grip. At least one of the engagement portions 3 provided on the vertical members 12, 13 is a locking engagement portion 50 having a holding plate 54 that abuts against the outer surface of the side wall C1 and extends from the upper surface to the inner surface of the side wall C1 to hold the side wall C1, and a locking portion 55 that is always biased toward the inside of the portal arm 1 and holds the container C together with the holding plate 54, and the locking engagement portion 50 is locked when the locking portion 55 is inserted from the outside into the through hole C1a.

[0076] As a result, when engaging the container hoisting device 10 with the container C, by lowering the container hoisting device 10 so that the holding plate 54 fits into the side wall C1 of the container C and abuts against the outer surface, the locking portion 55 is inserted into the through hole C1a from the outside, locking the locking engagement portion 50. Therefore, the container hoisting device 10 can be easily attached to the container C without any special work, simply by lowering the container hoisting device 10 so that the holding plate 54 fits into the side wall C1 of the container C.

[0077] (2) Rotating engagement part Furthermore, the vertical members 12, 13 have a first vertical member 12 on which a locking engagement portion 50 is provided, and a second vertical member 13 that can rotate in a direction away from the first vertical member 12, 13 around a rotation axis 14 connected to the horizontal member 11, and the engagement portion 3 of the second vertical member 13 is a rotatable engagement portion 70 that has an abutment plate 74 that abuts against the outer surface of the side wall C2 when the second vertical member 13 rotates toward the container C, and a holding portion 75 that protrudes from the abutment plate 74 toward the container C and holds the container C together with the abutment plate 74. After the locking engagement portion 50 engages with the container C, the rotatable engagement portion 70 rotates the second vertical member 13 toward the container C, so that the abutment plate 74 abuts against the side wall C2 and the holding portion 75 can be inserted into the through hole C2a.

[0078] As a result, when engaging the container hoisting device 10 with the container C, after the locking engagement portion 50 has engaged with one side of the container C, the container C can be held by the abutment plate 74, which rotates from the outside toward the container C on the other side of the container C to abut against the side wall C2, and the holding portion 75, which is inserted into the through-hole C2a. This eliminates the need to slide the first vertical member 12 and the second vertical member 13 constituting the portal arm 1 each time to grip and release the container C, improving work efficiency. Furthermore, even if the dimensions of the container C in the direction connecting the first vertical member 12 and the second vertical member 13 vary slightly depending on the manufacturer, or vary with each use due to bending due to the weight inside the container C, deterioration over time, individual differences, etc., the rotating abutment plate 74 abuts against the container C from the outside of the container C in a pressing manner, and individual dimensional differences can be absorbed.

[0079] (3) Container inversion The locking engagement part 50 and the rotating engagement part 70 have a first reversal shaft 53a as the reversal center of the container C, a first abutment plate 56 and a second abutment plate 76 formed in an arc shape concentric with the center of the second reversal shaft 73a, and a first plunger 57 and a second plunger 77 fixed in a position where their tips can abut against the first abutment plate 56 and the second abutment plate 76 regardless of the reversal angle of the container C. The first abutment plate 56 and the second abutment plate 76 engage with the container C. The container C has first holes 56a, 76a into which the tips of the first plunger 57 and the second plunger 77 fit when the part 3 is engaged, and second holes 56b, 76b into which the tips of the first plunger 57 and the second plunger 77 fit when the container C is at its limit angle of inversion, and the container C can be inverted between the angle at which the tips of the first plunger 57 and the second plunger 77 fit into the first holes 56a, 76a and the angle at which they fit into the second holes 56b, 76b.

[0080] As a result, when the tips of the first plunger 57 and the second plunger 77 engage with the first holes 56a, 76a and the second holes 56b, 76b, the container C is prevented from inverting. Therefore, by simply providing the first plunger 57 and the second plunger 77 and the first holes 56a, 76a and the second holes 56b, 76b, the movable inversion angle range of the container C can be more easily determined.

[0081] (4) Rotating shaft In addition, the second vertical member 13 on which the rotatable engagement portion 70 is provided is located closer to the center of the second vertical member 13 of the horizontal member 11 and can have a rotation axis 14 that rotates the second vertical member 13 in a direction toward and away from the container C.

[0082] As a result, the rotation shaft 14 that rotates the second reversing shaft 73a of the second vertical member 13 is provided closer to the center than the end of the horizontal member 11, so the second vertical member 13 is located outward in the direction of the horizontal member 11 from the rotation shaft 14. As a result, a moment of rotation toward the container C is always applied to the rotation type engagement part 70 provided on the second vertical member 13 around the rotation shaft 14 due to its own weight and the weight of the container C. Therefore, the force required by the worker to operate the second vertical member 13 can be reduced, and operability can be improved.

[0083] (5) Handle In addition, the second vertical member 13 on which the pivotable engagement portion 70 is provided may have a handle 13a that can be grasped by the operator when pivoting the second vertical member 13 in a direction away from the first vertical member.

[0084] This allows the operator to carry out the work by always holding the handle 13a provided at a predetermined position on the second vertical member 13, thereby improving workability.

[0085] (6) Upward protrusion of the holding part Furthermore, the tip of the holding portion 75 inserted into the through-hole C2a may have a protruding portion 75a that protrudes upward and can prevent the holding portion 75 from coming out of the through-hole C2a after a load is applied to the container C. This makes it possible to prevent the holding portion 75 from coming out of the through-hole C2a after the holding portion 75 is inserted into the through-hole C2a and the load of the container C is applied thereto. [Explanation of symbols]

[0086] 1 Gantry arm 2 Locking part 3 Engagement part 10 Container lifting equipment 11 Lateral members 12 First vertical member (vertical member) 13 Second vertical member (vertical member) 13a Handle 14 Rotating shaft 50 Locking engagement part (engagement part) 53a First reversal axis (reversal center) 54 Retaining plate 55 Rock Club 56 1st contact plate 56a 1st hole 56b 2nd hole 57 First plunger 70 Rotating engagement part (engagement part) 73a Second reversal axis (reversal center) 74 Contact plate 75 Holding part 75a Ridge 76 Second contact plate 76a 1st hole 76b 2nd hole 77 Second plunger C Container C1, C2 side wall C1a, C2a through hole

Claims

1. a portal arm formed of two vertical members and a horizontal member connecting the upper portions of the vertical members; a locking portion provided on the cross member and locked to a lower hook of a hoist; a container that accommodates cargo and has through holes in two opposing side walls for an operator to grip, the container being engaged with the two side walls in a manner that allows the container to be turned over, and engaging portions provided on each of the two vertical members; Equipped with At least one of the engagement portions provided on the vertical member is a holding plate that abuts against an outer surface of the side wall and extends from the upper surface to the inner surface of the side wall to hold the side wall; a locking portion that is always biased inwardly of the portal arm and holds the container together with the holding plate; a locking engagement portion having The locking engagement portion is locked by inserting the locking portion into the through hole from the outside. A container lifting device characterized by:

2. The container sling according to claim 1, The vertical member includes a first vertical member provided with the locking engagement portion, and a second vertical member that is rotatable around a rotation axis connected to the horizontal member in a direction away from the first vertical member. and The engaging portion of the second vertical member is a contact plate that contacts the outer surface of the side wall when the second vertical member rotates toward the container; a holding portion that protrudes from the contact plate toward the container and holds the container together with the contact plate; A rotary engagement portion having After the locking engagement portion engages with the container, the second vertical member rotates toward the container, causing the abutment plate to abut against the side wall and the holding portion to be inserted into the through hole. A container lifting device characterized by:

3. The container sling according to claim 1 or 2, The engagement portion is a contact plate formed in an arc shape concentric with the container's inversion center; a plunger fixed at a position where its tip can contact the contact plate regardless of the container's inversion angle; and the abutment plate has a first hole into which the tip of the plunger fits, and a second hole into which the tip of the plunger fits when the container is at the inversion limit angle, The container is reversible between an angle at which the tip of the plunger fits into the first hole and an angle at which the tip of the plunger fits into the second hole. A container lifting device characterized by:

4. The container sling according to claim 2, The rotation shaft is provided on the horizontal member closer to the center than the second vertical member, and rotates the second vertical member in a direction to move the second vertical member toward and away from the container. A container lifting device characterized by:

5. The container sling according to claim 2, The second vertical member provided with the pivotable engagement portion has a handle that can be grasped by an operator when pivoting the second vertical member in a direction away from the first vertical member. A container lifting device characterized by:

6. The container sling according to claim 2, a tip end of the holding portion inserted into the through hole has an upwardly protruding portion that can prevent the holding portion from coming out of the through hole after a load is applied to the container; A container lifting device characterized by:

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