JP7060215B2 - Crane attachment - Google Patents

Description

The present invention relates to an attachment for a crane, and more specifically, to reduce the labor of placing it on the ground in an attachment for a crane used by connecting to a spreader of a container crane when handling an open container. Regarding attachments for cranes that can be.

Conventionally, when loading and unloading open-type containers such as open-top containers, flat rack containers, and flatbed containers, cargo handling work is performed by attaching an attachment (over-height attachment) dedicated to open-type containers to the spreader of the container crane. (For example, see Patent Document 1). When removing the attachment from the spreader, the attachment is placed on the ground, but as shown in Patent Document 1, in the conventional attachment, the twist lock pin protrudes downward from the lower end of the pillar portion constituting the attachment. ing. Therefore, if the twist lock pin is grounded as it is and the attachment is placed on the ground, it is unstable and a large load is applied to the twist lock pin.

Therefore, conventionally, a pedestal provided with a fitting hole into which a twist lock pin can be fitted is placed on the ground, and an attachment is placed on the pedestal. However, each time the attachment is placed on the ground, it is necessary to transport the pedestal to the mounting position of the attachment and align the fitting hole of the pedestal with the twist lock pin of the attachment, so the attachment is placed on the ground. It took a lot of time and effort to put it on.

Jikkai Sho 52-123973

The present invention has been made in view of the above circumstances, and an object of the present invention is to place it on the ground in a crane attachment used by connecting to a spreader of a container crane when loading and unloading an open container. The purpose is to provide an attachment for a crane that can reduce labor.

The attachment for a crane of the present invention for achieving the above object has a frame structure having four pillars extending in the vertical direction and a beam portion connecting the pillars, and the frame structure. A connecting mechanism for detachably connecting the body to the spreader of the container crane, a twist lock pin protruding downward from the lower end of each of the pillars, and a support receiving member arranged in the vicinity of each of the twist lock pins, respectively. The support receiving member has a rotary connecting portion for rotatably connecting the support receiving member to the pillar portion, and the support receiving member has a lower end of the support receiving member in the vertical direction due to the rotation connecting portion. A first position where the twist lock pin is exposed above the lower end of the twist lock pin that extends , and a lower end of the twist lock pin that extends in the vertical direction at the lower end of the support receiving member. It is a configuration that can be moved to a second position located below, and in a state where the support receiving member is arranged at the second position, when the lower end of the support receiving member is brought into contact with the ground, the frame structure is formed. It is characterized in that the load of the body, the connecting mechanism, the twist lock pin, and the rotating connecting portion is supported by the support receiving member .

According to the present invention, the twist lock pin is exposed by arranging the support receiving member rotatably connected to the pillar portion via the rotary connecting portion at the first position, and is opened by the crane attachment. The type container is ready for cargo handling. Then, when the crane attachment is placed on the ground, the support receiving member is simply rotated from the first position to the second position by the rotary connecting portion, and the lower end of the support receiving member is grounded on the ground. Crane attachments can be placed on the ground. Therefore, it is possible to reduce the labor of placing the crane attachment on the ground as compared with the case of using the conventional cradle.

In the embodiment of the crane attachment of the present invention, it is an explanatory diagram schematically illustrating a state in which the attachment is attached to a spreader of a container crane and an open container is engaged under the attachment in a perspective view. It is explanatory drawing which schematically exemplifies the state which supported and received member of the attachment of FIG. 1 is arranged in the 1st position, with a perspective view. It is explanatory drawing which schematically exemplifies the state which supported and received member of the attachment of FIG. 1 is arranged in the 2nd position, with a perspective view. It is explanatory drawing which enlarges and exemplifies the lower part of the pillar part of the attachment of FIG. 1, FIG. The state where the member is arranged in the second position is shown. It is explanatory drawing which magnified and exemplifies the lower part of the pillar part of the attachment of FIG. 1, FIG. The state where the receiving member is arranged in the second position is shown. FIG. 6A is an explanatory view illustrating a state in which the support / receiving member of the attachment of FIG. 1 is arranged at the first position in a cross-sectional view, and FIG. 6B is an attachment of another embodiment according to the present invention. It is explanatory drawing which illustrates the state which arranged the support receiving member in the 1st position in the cross-sectional view. FIG. 7A is an explanatory view schematically illustrating still another embodiment of the attachment for a crane of the present invention in an enlarged side view of the lower part of the pillar portion, and FIG. 7A shows a state in which the support receiving member is arranged at the first position. 7 (b) shows a state in which the support receiving member is arranged at the second position. FIG. 8A is an explanatory view schematically illustrating still another embodiment of the attachment for a crane of the present invention in an enlarged side view of the lower part of the pillar portion, and FIG. 8A shows a state in which the support receiving member is arranged at the first position. 8 (b) shows a state in which the support receiving member is arranged at the second position.

Hereinafter, the attachment for a crane of the present invention will be described based on the embodiment shown in the figure.

As illustrated in FIG. 1, the crane attachment 1 (hereinafter referred to as attachment 1) according to the embodiment of the present invention is attached to the spreader (hanging tool) 20 of the container crane when loading and unloading the open container 30. Used. The open container 30 is a container with an open upper portion used when loading a large cargo or the like, and examples thereof include an open top container, a flat rack container, and a flat bed container.

In the drawing of the present application, the width direction of the open container 30 when loading and unloading the open container 30 using the attachment 1 is the X direction, and the length of the open container 30 orthogonal to the X direction in the horizontal direction. The direction (longitudinal direction) is the Y direction, and the vertical direction (height direction of the open container 30) is the Z direction.

As shown in FIGS. 2 and 3, the attachment 1 has a frame structure 2 having four column portions 2a extending in the Z direction and a beam portion 2b connecting the column portions 2a to each other, and a frame structure 2. A connecting mechanism 3 that detachably connects to the spreader 20 of the container crane, a twist lock pin 4 that protrudes downward from the lower end of each pillar portion 2a, and a support receiving member arranged in the vicinity of each twist lock pin 4. 6 and a rotary connecting portion 5 for rotatably connecting the respective support receiving members 6 to the pillar portion 2a.

The four pillar portions 2a are composed of tubular members having a rectangular cross section. The four pillar portions 2a are arranged at positions corresponding to the engagement holes provided at the upper ends of the four corners of the open type container 30. In this embodiment, the upper portions of the adjacent column portions 2a are connected to each other by the two beam portions 2b extending in the X direction and the two beam portions 2b extending in the Y direction. The number and arrangement of the beam portions 2b are not particularly limited, and for example, four or more beam portions 2b may be provided. The width dimension (X direction) and the length dimension (Y direction) of the frame structure 2 are set to substantially the same dimensions as the width dimension and the length dimension of the open container 30. That is, the frame structure 2 is formed with dimensions that do not protrude outward from the open container 30 in a plan view.

In this embodiment, as the connecting mechanism 3, the fitting portion 3a into which the twist lock pin of the spreader 20 can be fitted and the twist lock pin are locked to the fitting portion 3a at the upper end of each pillar portion 2a. A locking portion 3b is provided. By fitting the twist lock pin of the spreader 20 into the fitting portion 3a and locking the twist lock pin to the fitting portion 3a by the locking portion 3b, the spreader 20 and the frame structure 2 are connected to each other. Become.

The twist lock pin 4 of the attachment 1 is configured to be engageable with an engagement hole provided at the upper end of the open container 30. In this embodiment, the fitting portion 3a of the attachment 1 and the twist lock pin 4 are connected by an interlocking mechanism, and when the twist lock pin of the spreader 20 fitted to the fitting portion 3a is rotated, the spreader 20 is used. The twist lock pin 4 of the attachment 1 rotates in conjunction with the movement of the twist lock pin. That is, by operating the twist lock pin of the spreader 20, the twist lock pin 4 of the interlocking attachment 1 can be operated. In a state where the twist lock pin of the spreader 20 and the fitting portion 3a are locked by the locking portion 3b, the twist lock does not come off from the fitting portion 3a even if the twist lock of the spreader 20 is rotated. ..

The connecting mechanism 3 is not limited to the configuration of this embodiment, and may be any configuration as long as the spreader 20 and the frame structure 2 can be connected. Further, in this embodiment, the twist lock pin 4 of the attachment 1 to be interlocked can be operated by operating the twist lock pin of the spreader 20 by the interlocking mechanism, but the twist lock is not provided. It is also possible to manually rotate the pin 4.

The support receiving member 6 has a first position in which the lower end of the support receiving member 6 is located above the lower end of the twist lock pin 4 and the twist lock pin 4 is exposed by the rotation connecting portion 5, and the support receiving member 6. The lower end of the member 6 is movable to a second position located below the lower end of the twist lock pin 4.

As shown in FIG. 2, when the support receiving member 6 is arranged at the first position, the twist lock pin 4 is exposed and the twist lock pin 4 is provided in the upper end portion of the open container 30. It becomes a state where it can be engaged with. That is, by arranging the support receiving member 6 at the first position, the attachment 1 can handle the cargo of the open container 20.

As shown in FIG. 3, when the support receiving member 6 is arranged at the second position, when the lower end of the support receiving member 6 is grounded to the ground, the attachment 1 (frame structure 2, connecting mechanism 3, twist lock pin) is attached. 4 and the load of the rotary connecting portion 5) are supported by the support receiving member 6, and the twist lock pin 4 is not loaded. That is, by arranging the support receiving member 6 at the second position, the lower end of the support receiving member 6 is brought into contact with the ground, and the attachment 1 can be placed on the ground as it is.

As shown in FIGS. 4 (b) and 5 (b), the support receiving member 6 of this embodiment is a square flat plate-shaped bottom plate located below the twist lock pin 4 in a state of being arranged at the second position. The portions 6a are arranged on the upper ends of the three side plate portions 6b extending from the edges of the three sides of the bottom plate portion 6a in the normal direction (Z direction) of the bottom plate portion 6a, and the three side plate portions 6b. The mediating portion 6c and the mediating portion 6c are formed of a substantially box-shaped member joined to each other. The support receiving member 6 has one surface of the upper portion and the side portion open in a state of being arranged at the second position.

A flap plate 7 is attached to the edge of the remaining one side of the bottom plate portion 6a to which the side plate portion 6b is not provided via an urging hinge portion. The flap plate 7 is arranged so as to extend in the normal direction of the bottom plate portion 6a when an external force exceeding a certain level is not applied, and is configured to rotate around the urging hinge portion when an external force exceeding a certain level is applied. ing.

The rotary connecting portion 5 of this embodiment is configured to have a hinge portion (hinge) 5a that connects the side surface of the pillar portion 2a and one end surface of the support receiving member 6. The outer surface of the side plate portion 6b facing the opening where the flap plate 7 of the support receiving member 6 is provided and the side surface of the pillar portion 2a parallel to the side plate portion 6c are connected by the hinge portion 5a.

The attachment 1 further has a lock mechanism 8 for fixing the support / receiving member 6 at the first position and the second position, respectively. The lock mechanism 8 of this embodiment is configured to have a connecting plate 8a for connecting the support receiving member 6 and the pillar portion 2a, and a fixing pin 8b for fixing the connecting plate 8a in a predetermined direction. An elongated hole through which the fixing pin 8b can be inserted is formed at one end of the connecting plate 8a, and a round hole through which the support shaft 8c is inserted is formed at the other end of the connecting plate 8a.

The connecting plate 8a is arranged outside the pillar portion 2a and the support receiving member 6, and one end of the connecting plate 8a is provided via a fixing pin 8b on the side plate portion 6b on which the hinge portion 5a of the supporting receiving member 6 is not provided. Are connected. The other end of the connecting plate 8a is connected to the side surface of the pillar portion 2a parallel to the side plate portion 6b where the hinge portion 5a is not provided via the support shaft 8c. The lock mechanism 8 has a locked state in which the connecting plate 8a is fixed in a predetermined direction by changing the position of the fixing pin 8b in the elongated hole formed at one end of the connecting plate 8a, and the connecting plate 8a is It is configured to switch to the unlocked state that is not fixed. In the unlocked state in which the connecting plate 8a is not fixed, the connecting plate 8a is in a state of being rotatable with respect to the pillar portion 2a about the support shaft 8c, and the support receiving member 6 is connected around the fixing pin 8b. It becomes rotatable with respect to the plate 8a.

The frame structure 2, the connecting mechanism 3, the twist lock pin 4, the rotating connecting portion 5, the support receiving member 6, the flap plate 7, and the locking mechanism 8 are formed of, for example, a metal such as steel.

As shown in FIGS. 4 (b) and 5 (b), when the support receiving member 6 is arranged at the second position, the bottom plate portion 6a of the support receiving member 6 is located below the twist lock pin 4. , The mediation portion 6c and the side plate portion 6b of the support receiving member 6 are located below the pillar portion 2a. Then, the upper end of the mediation portion 6c of the support receiving member 6 and the lower end of the pillar portion 2a come into contact with each other, and the twist lock pin 4 is surrounded by the support receiving member 6 and the flap plate 7. The hinge portion 5a is in an open state, and the connecting plate 8a is in a state of extending in the Z direction. When the fixing pin 8b is moved to a predetermined position of the elongated hole in which the connecting plate 8a is locked, the connecting plate 8a is fixed in the direction extending in the Z direction, so that the support receiving member 6 is placed in the second position. It is in a fixed state with respect to the portion 2a.

As shown in FIGS. 4A and 5A, in a state where the connecting plate 8a is released from the fixing pin 8b, the support receiving member 6 is closed with respect to the pillar portion 2a in the direction in which the hinge portion 5a closes. When rotated, the support receiving member 6 rotates from the second position to the first position. When the support receiving member 6 rotates from the second position to the first position, the flap plate 7 rotates around the urging hinge portion by hitting the flap plate 7 with the twist lock pin 4.

In the state where the support receiving member 6 is arranged at the first position, the support receiving member 6 is located on the side of the pillar portion 2a, and the twist lock pin 4 is exposed. The hinge portion 5a is closed, and the side plate portion 6b to which the hinge portion 5a of the support receiving member 6 is connected and the side surface of the pillar portion 2a face each other. The bottom plate portion 6a of the support receiving member 6 is located on the upper side, and the mediation portion 6c is located on the lower side. The lower end of the support receiving member 6 arranged at the first position is located at substantially the same height as the lower end of the pillar portion 2a. The connecting plate 8a extends in a substantially horizontal direction, and when the fixing pin 8b is moved to a predetermined position of a long hole in which the connecting plate 8a is locked, the connecting plate 8a is fixed in a direction extending in a substantially horizontal direction. By doing so, the support receiving member 6 is in a state of being fixed to the pillar portion 2a at the first position.

In this embodiment, as shown in FIG. 6A, the support receiving member 6 is located in the region between the pillar portions 2a adjacent to each other in the X direction in a state where the support receiving member 6 is arranged at the first position. It will be in the state of. That is, the support receiving member 6 is in a state of being arranged at a position that does not protrude to the outside of the open type container 30 in a plan view.

Next, how to use this attachment 1 will be described.

As shown in FIG. 3, the attachment 1 is placed on the ground with the support receiving member 6 arranged at the second position. As shown in FIG. 1, when the attachment 1 is attached to the spreader 20 of the container crane, the spreader 20 is moved directly above the attachment 1 placed on the ground, and the spreader 20 and the frame structure 2 are moved by the connecting mechanism 3. And concatenate. In this embodiment, the twist lock pin of the spreader 20 is fitted into the fitting portion 3a, and the locking portion 3b is operated to lock the twist lock pin with respect to the fitting portion 3a, whereby the spreader 20 and the frame structure are formed. 2 is connected to each other.

Next, the spreader 20 and the attachment 1 are slightly raised to separate the support receiving member 6 from the ground. Then, the lock mechanism 8 releases the fixing of the support / receiving member 6 at the second position, the support / receiving member 6 is rotated from the second position to the first position, and the support / receiving member 6 is placed at the first position by the lock mechanism 8. To fix. As a result, the twist lock pin 4 of the attachment 1 can be engaged with the engagement hole provided at the upper end portion of the open container 30.

Then, when loading and unloading the open container 30, the attachment 1 is moved directly above the open container 30 and the twist lock pin 4 of the attachment 1 is inserted into the engagement hole of the open container 30. Then, the twist lock pin of the spreader 20 is operated to engage the twist lock 4 of the interlocking attachment 1 with the engagement hole of the open container 30. As a result, the attachment 1 and the open container 30 are connected to each other. Then, after the open container 30 is transferred and the open container 30 is placed at the target position, the twist lock pin of the spreader 20 is operated to engage the twist lock pin 4 of the interlocking attachment 1 and the open container 30. The engagement with the joint hole is released, and the open container 30 is separated from the attachment 1.

When the loading and unloading of the open container 30 is completed and the attachment 1 is removed from the spreader 20, the spreader 20 and the attachment 1 are lowered to the vicinity of the ground. Then, the lock mechanism 8 releases the fixing of the support / receiving member 6 at the first position, the support / receiving member 6 is rotated from the first position to the second position, and the support / receiving member 6 is moved to the second position by the lock mechanism 8. To fix. As a result, the lower end of the support receiving member 6 is positioned below the lower end of the twist lock pin 4.

Then, the spreader 20 and the attachment 1 are further lowered, and the lower end of the support receiving member 6 is brought into contact with the ground. When the lower end of the support receiving member 6 is brought into contact with the ground, the load of the attachment 1 is supported by the support receiving member 6, and the twist lock pin 4 is not loaded. In this embodiment, the load of the frame structure 2, the connecting mechanism 3, the twist lock pin 4, the rotating connecting portion 5, and the locking mechanism 8 is applied to the bottom plate portion 6a in a state where the entire surface of the bottom plate portion 6a is in contact with the ground. It is in a state of being supported by the side plate portion 6b and the mediation portion 6c. The twist lock pin 4 is surrounded by the support receiving member 6 and the flap plate 7 without touching the ground.

Next, the connection between the spreader 20 and the frame structure 2 by the connection mechanism 3 is released. In this embodiment, the twist lock of the spreader 20 is released from the fitting portion 3a of the attachment 1 by releasing the locking of the twist lock pin with respect to the fitting portion 3a by the locking portion 3b and raising the spreader 20. Then, when the spreader 20 is raised and the spreader 20 and the attachment 1 are separated from each other, the attachment 1 becomes independent on the ground.

As described above, the attachment 1 of the present invention is in a state where the open container 30 can be loaded and unloaded by the attachment 1 by arranging the support receiving member 6 rotatably connected to the pillar portion 2a at the first position. Become. Then, when the attachment 1 is placed on the ground, the support receiving member 6 is rotated from the first position to the second position by the rotation connecting portion 5, and the lower end of the support receiving member 6 is simply grounded on the ground. Therefore, the attachment 1 can be stably placed on the ground. That is, in the conventional attachment, every time the attachment is placed on the ground, it is necessary to transport the pedestal to the mounting position of the attachment and align the fitting hole of the pedestal with the twist lock pin of the attachment. However, in the attachment 1 of the present invention, such work becomes unnecessary. Therefore, it is possible to reduce the labor of placing the attachment 1 on the ground as compared with the case of using the conventional cradle.

A cell guide for guiding the container is provided in the hold of the container ship, and the container is loaded along the cell guide. As in this embodiment, the first position of the support receiving member 6 is provided. However, if it is set in the area between the adjacent pillar portions 2a, the support receiving member 6 does not protrude to the outside of the open type container 30 in a plan view when the open type container 30 is loaded and unloaded. Therefore, even when the open type container 30 is loaded and unloaded in the hold, the open type container 30 can be loaded and unloaded without the support receiving member 6 coming into contact with the cell guide. In this embodiment, as shown in FIG. 6A, the case where the first position is set in the region between the pillar portions 2a adjacent to each other in the X direction is illustrated, but is shown in FIG. 6B. The same effect can be obtained when the first position is set in the region between the pillar portions 2a adjacent to each other in the Y direction as in the embodiment.

When the rotary connecting portion 5 is composed of a hinge portion 5a that connects the side surface of the pillar portion 2a and one end surface of the support receiving member 6 as in this embodiment, the rotating connecting portion 5 and the support receiving member 6 are very large. Can be configured simply. Further, as in this embodiment, when the support receiving member 6 is composed of a substantially box-shaped member to which the bottom plate portion 6a, the side plate portion 6b, and the mediating portion 6c are joined, the support receiving member 6 is arranged at the second position. In this state, the twist lock pin 4 is surrounded by the side plate portion 6b, so that the side plate portion 6b makes it difficult for the sea breeze to hit the twist lock pin 4, which is advantageous for suppressing deterioration of the twist lock pin 4. .. Further, if the flap plate 7 is provided in the opening through which the twist lock pin 4 of the support receiving member 6 passes as in this embodiment, the flap plate 7 makes it more difficult for the sea breeze to hit the twist lock pin 4, so that the twist lock is made. It is more advantageous to suppress the deterioration of the pin 4.

As in this embodiment, if the support receiving member 6 is configured to have a lock mechanism 8 for fixing the support receiving member 6 at the first position and the second position, respectively, the support receiving member 6 arranged at the first position or the second position is unintentionally provided. It is possible to more reliably avoid the rotation to. Therefore, it is not essential to provide the lock mechanism 8 on the attachment 1, but it is preferable to provide the lock mechanism 8.

The locking mechanism 8 is not limited to the configuration of this embodiment, and may be configured as shown in FIGS. 7A and 7B, for example. The configuration of the attachment 1 other than the locking mechanism 8 shown in FIGS. 7A and 7B is the same as that of the above-exemplified embodiment.

The lock mechanism 8 of the embodiment shown in FIGS. 7A and 7B has a cord-like body 8d having one end connected to the support receiving member 6 and the other end of the cord-like body 8d provided on the pillar portion 2a. It is configured to have connecting tools 8e and 8f to which the portions are detachably connected. Examples of the cord-shaped body 8d include a wire rope and a chain. The pillar portion 2a includes a connecting tool 8e used in a state where the support receiving member 6 is arranged in the first position, and a connecting tool 8f used in a state where the support receiving member 6 is arranged in the second position. It is joined. In a state where the other end of the cord-shaped body 8d is not connected to the connecting tools 8d and 8f, the support receiving member 6 is in a state in which the support receiving member 6 can rotate with respect to the pillar portion 2a.

As shown in FIG. 7A, when the other end of the cord-like body 8d is connected to the connector 8e with the support receiving member 6 arranged at the first position, the cord-like body 8d is in a tense state (tensioned). The support receiving member 6 is fixed at the first position. As shown in FIG. 7B, when the other end of the cord-shaped body 8d is connected to the connector 8f with the support receiving member 6 arranged at the second position, the cord-shaped body 8d becomes tense. The support receiving member 6 is fixed at the second position.

The rotary connecting portion 5 and the support receiving member 6 are not limited to the configuration of the above-described embodiment, and may also have other configurations as shown in FIGS. 8A and 8B, for example. The configurations of the frame structure 2, the connecting mechanism 3, and the twist lock pin 4 of the attachment 1 shown in FIGS. 8A and 8B are the same as those of the above-exemplified embodiment.

The rotary connecting portion 5 of this embodiment is composed of a support shaft 5b provided at the lower part of the pillar portion 2a. The support receiving member 6 includes an arm portion 6d having one end rotatably supported by a support shaft 5b and rotatable with respect to the pillar portion 2a, and a bottom plate portion 6e joined to the other end of the arm portion 6d. It is composed of. A support shaft 5b and an arm portion 6d are provided on two opposite side surfaces of the pillar portion 2a so as to sandwich the pillar portion 2a, and the other ends of the two arm portions 6d are formed on one bottom plate portion 6e. It is joined. The arm portion 6d and the bottom plate portion 6e are joined in a direction in which the longitudinal direction (extending direction) of the arm portion 6d and the surface direction of the bottom plate portion 6e are orthogonal to each other.

As shown in FIG. 8A, when the support receiving member 6 is arranged at the first position, the arm portion 6d extends in a substantially horizontal direction, and the bottom plate portion 6e is above the lower end of the twist lock pin 4. It is positioned and the twist lock pin 4 is exposed. As shown in FIG. 8B, when the support receiving member 6 is arranged at the second position, the arm portion 6d extends in the Z direction, and the bottom plate portion 6e is located below the twist lock pin. .. In the attachment 1 of this embodiment, the bottom plate portion 6e is grounded to the ground, and the attachment 1 is placed on the ground.

1 Crane attachment 2 Frame structure 2a Pillar part 2b Beam part 3 Connecting mechanism 3a Fitting part 3b Locking part 4 Twist lock pin 5 Rotating connecting part 5a Hinge part 5b Support shaft 6 Support receiving member 6a Bottom plate part 6b Side plate part 6c Mediation part 6d Arm part 6e Bottom plate part 7 Flap plate 8 Lock mechanism 8a Connecting plate 8b Fixing pin 8c Support shaft 8d Cord-shaped body 8e, 8f Connecting tool 20 Spreader 30 Open type container

Claims (4)

A frame structure having four pillars extending in the vertical direction and a beam connecting the pillars, and a connecting mechanism for detachably connecting the frame structure to a spreader of a container crane, respectively. A twist lock pin protruding downward from the lower end of the pillar portion, a support receiving member arranged in the vicinity of each of the twist lock pins, and each of the support receiving members are rotatably connected to the pillar portion. It has a rotary connecting part and
In the support receiving member, the lower end of the support receiving member is positioned above the lower end of the twist lock pin extending in the vertical direction by the rotation connecting portion, and the twist lock pin is exposed. The structure is such that the lower end of the support receiving member can be moved to one position and the second position located below the lower end of the twist lock pin extending in the vertical direction, and the support receiving member is in the second position. When the lower end of the support receiving member is grounded to the ground, the load of the frame structure, the connecting mechanism, the twist lock pin, and the rotary connecting portion is supported by the support receiving member. Attachment for cranes characterized by being in a state . The attachment for a crane according to claim 1, further comprising a locking mechanism for fixing the support receiving member at the first position and the second position, respectively. A flap plate rotatable with respect to the support receiving member is provided at the opening of the support receiving member through which the twist lock pin passes when moving between the first position and the second position. The crane according to claim 1 or 2 , wherein when the support receiving member is arranged at the second position, the side of the twist lock pin is surrounded by the support receiving member and the flap plate . attachment. The crane attachment according to any one of claims 1 to 3, wherein the first position is set in an area between adjacent pillar portions.

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