JP2001328793A - Crane device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent crane jib separation at the time of being housed. SOLUTION: A crane device 1 is equipped with a jib 3 extending from the forefront of a boom at the time of service and housed in the condition parallel with and close to the boom 2 by a mounting and removing device when out of service, wherein the mounting and removing device 4 is composed of an engaging mechanism 41 and a member 42 to be engaged installed separately on the boom 2 side and jib 3 side, and the engaging mechanism 41 has an engaging member 44 to perform the mounting and removing motions on/from the member 42 to be engaged, while the jib 3 is furnished with a mounting and removal restricting member 6 to be located so as to restrict the mounting and removing motions of the engaging member 44 with the housing motion of the jib 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crane device, and more particularly to a crane device suitable for using a jib.

[0002]

2. Description of the Related Art As shown in FIG. 13, in a conventional crane apparatus 100, a boom 1
There is a case where a cantilever-shaped jib 102 is further added to the tip end of the jib 101 and a hook 103 is hung from the tip end of the jib 102 to perform an operation.

When the jib 102 is not used, the jib 102 shown in FIG.
As shown in the figure, the boom 101 is detachably stored on the side surface of the boom 101 by the attaching / detaching device 104 in a state of being arranged in parallel with the boom 101. The attachment / detachment device 104 includes a jib 1
02 are provided at two locations, near the front end (the end opposite to the base end) and at the middle. FIG. 15 is an illustration of an end face taken along line XX in FIG. 14, and FIG.
5 shows the attaching / detaching device 104 near the jib tip as viewed from the Y direction.

[0004] According to these Figs.
Reference numeral 04 denotes a frame 105 provided on the boom 101, a lock pin 106 held by the frame 105 so as to be able to move forward in the longitudinal direction of the boom 101, and biases the lock pin 106 to a locked state ( A coil spring 107 that presses to the left in FIG. 16) and a locked member 108 fixedly mounted on the jib 102 are provided.

The locked member 108 is erected from the surface of the jib 102 facing the boom 101, and has an engagement hole formed at the tip thereof. The boom 101 and the jib 102 are connected by fitting the tip of the lock pin 106 into the engagement hole. The jib 102 is detached from the boom 101 by moving the lock pin 106 rightward against the elastic force of the coil spring 107 to release the engagement between the locked member 108 and the lock pin 106. .

[0006]

SUMMARY OF THE INVENTION
Since the locked member 108 is released only by the operation of moving the lock pin 106 in the release direction, the boom 1
To prevent accidental release of jib 102 from 01,
A safety device for preventing the movement of the lock pin 106 was indispensable. As this safety device, a manual fixing pin for fixing the movement of the lock pin 106 by simultaneously inserting the lock pin 106 and each of the insertion holes provided in the frame 105 was generally used.

[0007] However, even when such a fixing pin is used to prevent the release, care must be taken at all times so as not to forget to attach the fixing pin, and mounting and releasing the fixing pin is complicated. It was accompanied by sex.

[0008]

SUMMARY OF THE INVENTION It is an object of the present invention to improve the disadvantages of the prior art, to eliminate the complexity of the work, and to provide a crane apparatus having higher reliability in the work of attaching and detaching the jib.

[0009]

According to the first aspect of the present invention, there is provided a crane apparatus having a jib which is extended from the end of the boom when used, and which is stored in a side-by-side state with the attachment / detachment device when not in use. The attachment / detachment device includes a locking mechanism and a locked member which are separately provided on the boom side and the jib side.

The locking mechanism has a locking member for performing an attaching / detaching operation with respect to the member to be locked, and an arrangement for restricting the attaching / detaching operation of the locking member by the storing operation of the jib on either the boom or the jib. Providing a detachable regulating member that becomes
The configuration is adopted.

In the above-described configuration, either the case where the locking mechanism is mounted on the boom and the locked member is mounted on the jib, or the case where the locking mechanism is mounted on the jib and the locked member is mounted on the boom, It may be. Here, a case where the locking mechanism is mounted on the boom and the locked member is mounted on the jib will be described as an example.

When storing the jib, the jib is detached from the end of the boom, and the attachment / detachment device holds the jib so as to be parallel to and close to the boom. Then, the locking member of the locking mechanism performs a certain attachment / detachment operation so as to be coupled to the locked member, and the jib is connected to the boom via these members, thereby realizing the storage.

[0013] At this time, when the jib is accommodated in a fixed storage position, the attachment / detachment restricting member provided on the boom or jib is positioned so as to hinder the attaching / detaching operation of the locking member. Therefore, as long as the jib is at the fixed storage position, the locking member cannot perform the attaching / detaching operation, and the jib effectively maintains the connection state with the boom. Also, to remove the jib,
By displacing the jib from a fixed storage position, the arrangement of the attachment / detachment regulating member is changed, and the attachment / detachment operation of the locking member is enabled.
Thereby, the engagement state between the locking member and the locked member is released, and the jib is released from the boom.

According to a second aspect of the present invention, in addition to the configuration of the first aspect, the attaching / detaching device movably holds the jib from the lower surface side to the side surface of the boom, and controls the movement. A biasing means for biasing is provided, and the attachment / detachment regulating member is arranged to regulate the attachment / detachment operation of the locking member only when the jib is on the side surface of the boom.

In such a configuration, on the lower surface side of the boom, the locking member locks the locked member by the attachment / detachment operation, so that the boom and the jib are connected. Then, when the jib is moved from the lower surface side to the side surface side of the boom in such a connected state by the urging means, the attachment / detachment regulating member is located at the attachment / detachment operation regulating position of the locking member, and the jib is moved to the side of the boom. As long as it is located on the side, the locking member locks the locked member, and the connection between the jib and the boom is maintained.

When the jib is to be removed, the jib is moved from the side surface to the lower surface of the boom by the urging means to enable the attaching / detaching operation of the locking member and release the locked state of the locked member. . This removes the jib from the boom.

According to the third aspect of the present invention, the first or second aspect is provided.
In addition to the configuration of the described invention, the locking mechanism has the locking member movably between the locked position and the released position of the locked member, and the detachment-restricting member is configured to be used when the jib is stored. With the movement to the disposition, a configuration is adopted in which a contact portion is provided which comes into contact with the locking member located on the release position side of the locking position and presses the locking member to the locking position. .

In the above configuration, the locked member is locked when the locking member is at the locking position, and the locked state of the locked member is released when the locking member is at the release position. That is, the locking mechanism locks and releases the locked member by moving the locking member between these two positions.

If the locking member does not sufficiently lock the locked member, the locking member is located halfway from the release position to the locking position. In this configuration, since the attachment / detachment restricting member has the contact portion that comes into contact with the locking member located in the middle as described above, when the jib is stored in the storage position, the engagement is insufficiently locked. The stop member is pressed to its locking position. Therefore, in such a configuration, the same operation as each of the above-described configurations is performed, and the locking member always locks the locked member until the storage of the jib is completed.

The present invention is intended to achieve the above-described object by the above-described configurations.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment (Overall Configuration of Crane Apparatus) A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a perspective view illustrating a main part of a crane device 1 according to the present embodiment. The crane device 1 is mounted on a traveling vehicle (not shown), extends at the tip of the boom 2 when in use, and is stored in the boom 2 via the attachment / detachment devices 4 and 5 when not in use. Jib 3 is provided.

The boom 2 is supported by an upper revolving structure 10 having a cockpit, and can freely move up and down. On the other hand, in use, the jib 3 has its proximal end connected to the distal end of the boom 2 and is extended in a direction extending along the longitudinal direction of the boom 2 or in a state of being bent within a certain acute angle range. (See FIG. 13). In addition, when not in use, as shown in FIG.

Further, the jib 3 is attached to the boom 2 by the attachment / detachment devices 4 and 5 from the side to the bottom (FIG. 1).
(In the direction of the arrow). After the movement, the base end of the jib 3 is moved to the boom 2.
By connecting the jib 3 to the mounting portion 21 at the end of the jig 3 and largely turning the jib 3 along a vertical plane including the boom 2, the arrangement in the use state shown in FIG.

(Removable Device) The jib 3 is connected to the boom 2 via two removable devices 4 and 5. One attachment / detachment device 4 is provided on the distal end portion of the jib 3 (the base end portion of the boom 2), and the other attachment / detachment device 5 is provided at an intermediate portion of the jib 3. For the arrangement of these attachment / detachment devices, see Boom 2
Any arrangement may be used as long as it is along the longitudinal direction, but it is desirable that the number of individual detachable devices is two or more.

Each of these attachment / detachment devices 4 and 5 allows the jib 3 to move freely with respect to the boom 2 and connects them.
When necessary (for example, when the jib is rotated from the lower surface side of the boom 2 to the distal end), the jib 3 can be separated from the boom 2 freely.

Hereinafter, since the main structure of the attaching / detaching device 4 and the attaching / detaching device 5 are the same, the attaching / detaching device 4 will be mainly described, and only the different portions of the attaching / detaching device 5 will be explained.

FIG. 2A shows the attachment / detachment device 4 viewed from the direction of the arrow W in FIG. 1 in a state where the jib 3 is located on the lower surface side of the boom 2. As shown in FIG. 2A, the attaching / detaching device 4 includes a locking mechanism 41 provided on the boom 2.
And a locked member 42 that is mounted on the jib 3 and locked by the locking mechanism 41. Further, the locking mechanism 4
Reference numeral 1 denotes a frame 43 provided on a side surface of the boom 2, a lock pin 44 as a locking member held by the frame 43 so as to be able to move forward in the longitudinal direction of the boom 2, and a lock pin 44. A coil spring 45 for urging (pressing leftward in FIG. 2A) the lock 44 and a release mechanism 46 (see FIG. 1) for releasing the locked state of the locked member 42 by the lock pin 44. It has.

The lock pin 44 has a rod shape, and is provided at its one end side by a coil spring 45 (FIG. 2A).
Is a locking position where the locked member 42 can be locked, and is positioned on the other end side thereof (right side in FIG. 2A) by the release mechanism 46. The released state is the release position.

One end of the lock pin 44 is formed in a substantially wedge-like slope, and a wire of a release mechanism 46 is connected to the other end. In the vicinity of the other end, a projection 47 for engaging with the attachment / detachment regulating member 6 described later is provided upright along a direction orthogonal to its own longitudinal direction.

The release mechanism 46 includes a wire connected to the lock pin 44 and an operation lever disposed near the base end of the boom 2. When the operation lever is operated, the lock pin 44 is connected via the wire. It can be moved to the release position against the tension of the coil spring 45. Therefore, the locking mechanism 41 can be remotely operated. The release mechanism 46 may be configured to apply tension using a rod or a rope instead of a wire.

The lock pin 44 is replaced by a solenoid or a hydraulic or pneumatic cylinder mechanism instead of the coil spring 45.
May be biased to the locking position. In this case, the release mechanism 46 uses an operation circuit of a solenoid or a cylinder mechanism.

On the other hand, the to-be-locked member 42 is a plate-shaped bracket which is provided upright on the surface of the jib 3 facing the boom 2 and, as shown in FIG. A hole 42a is formed. And, this engagement hole 42a
When the distal end of the lock pin 44 is inserted into the lock member 44, the lock state is established and the connection between the boom 2 and the jib 3 is achieved. Also, as shown in FIG.
4 is pulled toward the release position by the release mechanism 46, and the tip of the lock pin 44 is pulled out of the engagement hole 42a.
The engagement state is released, and the jib 3 can be separated from the boom 2.

The attachment / detachment device 4 moves the lock pin 4 in conjunction with the operation of moving the jib 3 to the storage position of the boom 2.
4 has an automatic locking structure for automatically locking the locked member 42. That is, the locked member 42 has a wedge-shaped edge at the tip end thereof, and the locking pin 4
As described above, the leading end of 4 is also formed in a wedge shape. Then, as the jib 3 approaches the boom 2, the shapes of the tips are set so that the inclined surfaces of the tips come into contact with each other.

The automatic locking operation will be described with reference to FIG. FIG. 4A shows a state in which the jib 3 is approaching the boom 2. Next, in FIG. 4B, the tip of the locked member 42 contacts the tip of the lock pin 44,
This shows a state in which the lock pin 44 is pressed by the locked member 42 and starts to retreat. Next, FIG. 4C illustrates a state before the locked member 42 completely retracts the lock pin 44 and is locked. FIG. 4D shows a state in which the lock pin 44 enters the engagement hole 42a and locks the locked member 42.

As described above, the attachment / detachment device 4 moves the jib 3 closer to the boom 2 in order to store the jib 3,
Since the lock pin 44 serving as the locking member has a so-called auto-lock structure in which the locked member 42 is locked, the complexity of manually performing the above operation is eliminated, and operability can be improved. .

The attachment / detachment device 5 is a hydraulic cylinder as an urging means for urging the jib 3 held between the attachment / detachment devices 4 and 5 to move between the lower surface and the side surface of the boom 2. A mechanism 58 is provided. Therefore, boom 2
It is possible to pull up the jib 3 connected on the lower surface side to the side surface side and to hold the jib 3 at the side surface side, that is, the storage position, and to lower the jib 3 by gentle operation as needed.

(Removal control member) Further, the crane device 1
The attachment / detachment restricting member 6 is arranged to regulate the release operation of the lock pin 44 of the attachment / detachment device 4 by the storage operation of the jib 3
have. The attachment / detachment regulating member 6 is in the shape of a strip, and is provided upright on the surface facing the boom 2 on the jib 3 side like the locked member 42. This attachment / detachment regulating member 6
As shown in FIG. 2 (A), when the jib 3 is located on the lower surface side of the boom 2 in a state of being connected by the attaching / detaching device 4, it extends in the same direction as the projection 47 of the lock pin 44. .

The position of the attachment / detachment regulating member 6 in the longitudinal direction of the boom 2 is determined by the lock pin 44 in the locked state.
Of the protrusion 47 near the release position (arrow V in FIG. 2A).
Side). Strictly, the locking position side end 61 of the attachment / detachment regulating member 6 is slightly closer to the release position side than the release position side end 47a of the projection 47.

Further, the lock pin 44 of the attachment / detachment regulating member 6
The arrangement in the radial direction with the center at will be described with reference to FIG. FIG. 5 is an end view taken along the line UU in FIG. 2A, and shows a state in which the jib 3 has moved to the side surface of the boom 2 by a two-dot chain line. As shown here,
The attachment / detachment restricting member 6 is arranged such that its flat plate surface is along and close to the lock pin 44 in the longitudinal direction. Also, since the jib 3 rotates about the lock pin 44, the same can be said whether the jib 3 is located on the lower surface side or the side surface side of the boom 2.

FIG. 6 shows the jib 3 from the direction of arrow T in FIG.
FIG. 6 is a plan view showing a state where is located on the side surface side of the boom 2. Since the attachment / detachment restricting member 6 is set in the above-described arrangement with respect to the lock pin 44, when the jib 3 is turned to the side, the detachment / adjustment restricting member 6 is immediately attached to the release position side end 47a of the projection 47. 6 will be adjacent. Therefore, when the jib 3 is located on the side surface, the attachment / detachment restricting member 6 does not hinder when the jib 3 is located on the lower surface side of the jib 3 boom 2, but moves from the locking position of the lock pin 44 to the release position side. Will be hindered.

Further, the attachment / detachment restricting member 6 is provided with a lock pin 44 located at the release position side of the locking position at the end of the jib 3 as the jib 3 moves from the lower surface to the side surface. The lock pin 4 contacts the projection 47 and
4 is provided with a contact portion 62 for pressing the contact member 4 to the locking position.

The contact portion 62 extends in a direction in which the distal end of the attachment / detachment regulating member 6 is inclined in the direction from the locking position to the release position (rightward in FIG. 6) from the base end to the distal end. It is formed by cutting. The contact portion 62 is provided with the lock pin 44 which should be in the locked state.
Has a function of pressing it between the locking positions when it is located more than the releasing position than the locking position due to some unexpected cause (friction between the lock pin 44 and the frame 43). are doing.

FIG. 7 is an explanatory diagram showing a state in which the lock pin 44 is pressed toward the locking position by the attachment / detachment regulating member 6. According to this, when the lock pin 44 is located near the release position, the protrusion 47 moves from the distal end to the proximal end of the attachment / detachment regulating member 6 with the rotation of the jib 3 from the lower surface to the side surface. , Gradually pressing the lock pin 44 toward the locking position.

(Operation of the First Embodiment) The storage operation of the jib 3 of the crane apparatus 1 having the above configuration will be described with reference to FIGS.

The jib 3 in use is mounted on the mounting portion 21 at the tip of the boom 2 in a direction in which the boom 2 extends (see FIG. 13). At the time of storage, the jib 3 is moved approximately 180 degrees along the vertical plane with the mounting portion 21 as a fulcrum.
[°], and the jib 3 is
Gradually approaching in parallel. As a result, in the attaching / detaching device 4, the locked member 42 approaches the locking mechanism 41, and the inside of the locking mechanism 41 is locked until the distal end of the locked mechanism 42 is locked by retracting the lock pin 44. (Figure 4)
reference). The same operation is performed in the attaching / detaching device 5.

When the detaching devices 4 and 5 are connected (FIG. 2)
(See FIG. 5A.) The jib 3 is urged by the hydraulic cylinder mechanism 58 from the lower surface side to the side surface side of the boom 2 with the lock pin 44 as a fulcrum (see FIG. 5). At this time, if the movement of the lock pin 44 to the locking position is insufficient, the contact portion 62 of the attachment / detachment restricting member 6 presses the protrusion 47 with the rotation of the jib 3, and the lock pin 44 is moved. Move to the locking position (see FIG. 7).

Thus, the jib 3 is stored at the storage position. In such an arrangement, the attachment / detachment regulating member 6 is located immediately on the release position side of the projection 47 of the lock pin 44 (see FIG. 6), and thus the release mechanism 4 is erroneously operated, for example.
Even when the operation lever 6 is released, the lock pin 44 is blocked from moving in the release direction by the attachment / detachment restricting member 6, thereby preventing the jib 3 from falling off accidentally.

When the jib 3 is to be used again, the jib is first moved from the side surface position to the other surface side by the hydraulic cylinder mechanism 58. As a result, the attachment / detachment restricting member 6 retreats from the position where the movement of the lock pin 44 is blocked, so that the release mechanism 4
The lock pin 44 can be moved to the release position by the operation lever 6 to separate the jib 3 from the boom 2 (see FIG. 3).

(Effect of First Embodiment) Crane device 1
As described above, the jib 3 is provided with the attachment / detachment restricting member 6 which is arranged to regulate the attachment / detachment operation of the lock pin 44 by the storage operation of the jib 3, so that an independent operation is required simultaneously with the storage of the jib 3. It is possible to prevent the lock pin 44 from being released without the above. Therefore, unlike a conventional fixing pin which is manually attached and detached, there is no possibility of forgetting to attach it, and it is not necessary to pay attention to forgetting to attach, and further, it is possible to eliminate the complexity of attaching the fixing pin. It is possible. However, in order to more strictly prevent the jib 3 from being accidentally released, the fixing pin 6 and the attachment / detachment regulating member 6 may be used in combination.

Further, in the crane apparatus 1, the arrangement is set such that the attachment / detachment regulating member 6 comes to the operation regulating position of the lock pin 44 together with the movement of the jib 3 to the side of the boom. The attachment / detachment regulating member 6 always regulates the attachment / detachment operation of the lock pin 44, and the attachment / detachment regulation member 6 can always release the attachment / detachment operation of the lock pin 44 when the jib 3 is used.

Further, the attachment / detachment regulating member 6 includes a lock pin 44.
Is provided with a contact portion 62 that presses to the locking position.
At the time when the storage of the jib 3 is completed, it is possible to effectively prevent the lock pin 44 from being shifted from the locked position to the release position or being in an insufficient locked state.

In the attachment / detachment device 4 described above, the locking mechanism 41 is provided on the boom 2 side, and the locked member 42 is provided on the jib 3 side. The locking member 42 may be provided on the boom 2 side. In this case, the attachment / detachment regulating member 6 is also similar to the locked member 42 in the boom 2.
Equipped on the side.

[Second Embodiment] The above-described crane apparatus 1
In the above, the crane device 1 is disclosed in which the jib 3 extended from the tip of the boom 2 is rotated along a vertical plane to move to the lower surface side of the boom, and further stored in the side surface of the boom. Is not particularly limited to the crane device of the type in which the boom is pulled up from the lower surface to the side surface and stored.

In the second embodiment, the jib 3A extending from the end of the boom 2A is rotated along a horizontal plane (actually, a plane inclined by the boom tilt angle from the horizontal plane) to rotate the boom 2A. Disclosed is a crane device 1A that is stored on the side. FIG. 8 shows a view of the crane apparatus 1A as viewed from above.

As shown in FIG. 8, the base end of the jib 3A is rotatably and detachably connected to the distal end of the boom 2A about an axis substantially in a vertical direction. Then, the jib 3A is stored in a folded state in parallel with and close to the boom 2A via the attaching / detaching device 4A (FIG. 9). Removable device 4A
Is provided between the folded jib 3A and the boom 2A, and is disposed at an intermediate portion in the longitudinal direction thereof.

The attachment / detachment device 4A includes a locking mechanism 41A mounted on the boom 2A, and a locked member 42A mounted on the jib 3A and locked by the locking mechanism 41A. As shown in FIG. 10, the locking mechanism 41A
A frame 43A provided on the side surface of the boom 2A, a lock pin 44A as a locking member held by the frame 43A so as to be able to move forward in a substantially vertical direction, and the lock pin 44A is locked. A coil spring 45A for urging (pressing upward in FIG. 10) and a lock pin 44A
And a release mechanism (not shown) for releasing the locked state of the locked member 42A.

The lock pin 44A has a rod-like shape. The lock pin 44A is positioned above by the coil spring 45A is a lock position where the locked member 42A can be locked, and is positioned below by the release mechanism. The state where it is present is the release position. The lock pin 44A has an upper end formed with an inclined surface in a substantially wedge shape, and a lower end connected to a wire of a release mechanism. In the vicinity of the lower end portion, a detachment restricting member 6 described later is provided.
A projection 47A for engaging with A is provided upright along a direction orthogonal to its own longitudinal direction.

The release mechanism is a release mechanism 4 of the crane device 1.
6 is used, but this crane device 1A
Release mechanism, the lock pin 44A
In that it is lowered downward.

On the other hand, the to-be-locked member 42A is a plate-shaped bracket which is erected from the surface of the jib 3A facing the boom 2A, and has an engaging hole 42Aa formed near the tip thereof. The lock pin 4 is inserted into the engagement hole 42Aa.
The boom 2A and the jib 3A are connected with each other by being locked by fitting the distal end of the 4A. When the lock pin 44A is pulled toward the release position by the release mechanism and the tip of the lock pin 44A is pulled out of the engagement hole 42Aa, the engaged state is released.
The jib 3A can be separated from the boom 2A.

Also, since the inclined surface is formed so that the tip of the lock pin 44A becomes wedge-shaped, the jib 3A is moved to the storage position of the boom 2A as in the case of the attachment / detachment device 4 of the crane device 1. Lock pin 4
4A has an automatic locking structure for automatically locking the locked member 42A.

By the way, as shown in FIG. 9, the jib 3A is finally connected and stored at its distal end by fixed support means 7A connected to the boom 2A. In order to connect the jib 3A and the boom 2A by the fixed support means 7A, the connection between the distal end of the boom 2A and the base end of the jib 3A is released from the state shown in FIG.
It is necessary to rotate the jib 3A so that the tip of the jib 3A approaches the side surface of the boom 2A about A.

The crane device 1A includes a detachable restricting member 6A that switches to a state in which the releasing operation (pulling down operation) of the lock pin 44A is restricted by using the rotating operation about the lock pin 44A. I have.

One end of the attachment / detachment regulating member 6A has a jib 3
A is bent to the A side, and the other end is the protrusion 47 of the lock pin 44A.
The arrangement is closer to the side of the boom 2A than to the side A, and is provided on the side of the boom 2A. Further, the attachment / detachment restricting member 6A is rotatably supported on a side surface of the boom 2A at an intermediate portion thereof around a substantially vertical direction, and one end facing the jib is always fixed to the jib 3 by a coil spring 61A.
Pressed to A side.

FIG. 11 shows the attaching / detaching device 4A in the state of FIG.
12 shows an enlarged view of the attachment / detachment regulating member 6A, and FIG. 12 shows an enlarged view of the attachment / detachment device 4A and the attachment / detachment regulating member 6A in the state of FIG. Reference numeral 48A in FIGS.
4A is a receiving member.

When the jib 3A is not yet connected to the boom 2A by the fixed support means 7A, as shown in FIG. 11, one end of the attachment / detachment regulating member 6 is separated from the boom 2A. In such a state, there is nothing to block the movement of the lock pin 44A to the release position side.

Further, when the base end of the jib 3A is separated from the distal end of the boom 2A and the fixed support means 7A is connected, the jib 3A moves one end of the attachment / detachment regulating member 6A toward the boom 2A against the coil spring 61A. When pressed, the other end of the attachment / detachment regulating member 6A moves directly below the projection 47A of the lock pin 44A (FIG. 12B). Therefore, the lock pin 4
4A cannot move to the release position side, and jib 3A
Will not be able to be separated.

When the jib 3A is to be mounted on the tip of the boom 2A again, the connection of the fixed support means 7A is released.
If the base end of the jib 3A is connected to the distal end of the boom 2A, the attachment / detachment restricting member 6A rotates in the pressing direction of the coil spring 61A, and the other end is the projection 47 of the lock pin 44A.
A, the locking mechanism 41A moves from the locked member 4
2A can be released from the locked state.

As described above, even in the crane apparatus 1A having the above-described configuration, the attachment / detachment regulating member 6A is arranged to regulate the releasing operation of the lock pin 44A in conjunction with the storing operation of the jib 3A. It is possible to avoid forgetting to attach the fixing pins, and it is possible to eliminate complicated attaching and detaching operations.

[0069]

According to the first aspect of the present invention, since there is provided an attachment / detachment regulating member which is arranged to regulate the attachment / detachment operation of the locking member by the storage operation of the jib, another operation is required simultaneously with the storage of the jib. The locking member can be locked without performing. Therefore, there is no possibility of forgetting to attach like a fixing pin which is manually attached and detached as in the past,
Also, it is not necessary to pay attention to forgetting to attach, and it is possible to eliminate the complexity of mounting the fixing pin.

According to the second aspect of the invention, the same effect as the first aspect of the invention is provided, and the attachment / detachment regulating member is located at the attachment / detachment operation regulating position of the locking member when the jib is on the side of the boom. Since the arrangement is set, it is particularly suitable for a crane device of the type in which the jib is lifted from the lower surface to the side surface of the boom as in the present invention.

Further, since the release of the attachment / detachment restricting member is performed together with the movement of the jib toward the lower surface of the boom, an independent release operation is not required, and the operability is further improved.

According to the third aspect of the present invention, the jib is provided because it has the above-described effects and the contact portion for pressing the locking member located at the release position side to the locking position. When the lock member is displaced from the lock position to the release position or is in an insufficient lock state during storage, the attachment / detachment restricting member moves the lock member to the lock position by the contact portion. By pressing and moving the jib, it is possible to effectively maintain the holding state of the jib.

Since the present invention is constructed and functions as described above, according to the present invention, it is possible to provide an excellent crane device which has not been achieved conventionally.

[Brief description of the drawings]

FIG. 1 is a partial perspective view showing a first embodiment of the present invention.

2 (A) shows the attaching / detaching device viewed from the direction of arrow W in FIG. 1 in a state where the jib is located on the lower surface side of the boom, and FIG. 2 (B) is the left side of FIG. 2 (A). 2 shows a locked member as viewed from the side.

FIG. 3 is an operation explanatory view showing a state in which a lock pin has moved to a release position side from the state of FIG. 2 (A).

FIG. 4 is an operation explanatory view showing an operation until a locked member is locked by a locking mechanism, and FIG. 4 (A) shows a state in which the jib is approaching a boom; , FIG. 4 (B)
FIG. 4C shows a state in which the lock pin starts being retracted by being pressed by the locked member, FIG. 4C shows a state just before the locked member is locked, and FIG. It shows a state where the locked member is locked.

FIG. 5 is an end view taken along the line UU in FIG.

FIG. 6 is a plan view showing a state in which the jib is located on the side of the boom from the direction of arrow T in FIG. 2 (A).

FIG. 7 is an explanatory view showing a state in which the lock pin is pressed toward the locking position by the attachment / detachment regulating member.

FIG. 8 is a plan view of the second embodiment, showing a state before a jib storage position.

FIG. 9 is a plan view of the second embodiment, showing a storage state of a jib.

FIG. 10 is a perspective view of the attachment / detachment device and attachment / detachment regulating member disclosed in FIG. 8;

11 (A) is an enlarged view of the attachment / detachment device and attachment / detachment regulating member in the state of FIG. 8, and FIG. 11 (B) is FIG.
1A shows a cross-sectional view along the line RR.

12 (A) is an enlarged view of the attachment / detachment device and attachment / detachment regulating member in the state of FIG. 9, and FIG. 12 (B) is FIG.
FIG. 2A is a cross-sectional view taken along the line SS in FIG.

FIG. 13 is a perspective view showing a jib of a conventional crane device.

FIG. 14 is a partial perspective view of a conventional crane device.

FIG. 15 shows an end view along the line XX of FIG. 14;

FIG. 16 is a plan view of the attaching / detaching device as viewed from a Y direction in FIG. 15;

[Explanation of symbols]

 1, 1A Crane device 2, 2A boom 3, 3A jib 4, 4A, 5 Detachable device 6, 6A Detachable restricting member 41, 41A Locking mechanism 42, 42A Locked member 44, 44A Lock pin (locking member) 58 Hydraulic cylinder mechanism (biasing means) 62 Contact part

Claims (3)

[Claims] 1. A crane device having a jib extended from a tip end of a boom when in use and stored in parallel with and adjacent to the boom by an attachment / detachment device when not in use, wherein the attachment / detachment device is connected to the boom side and the boom side. A locking mechanism separately provided on a jib side and a locked member, wherein the locking mechanism has a locking member for performing attachment / detachment operation on the locked member, and the boom or the jib A crane device provided with an attachment / detachment restricting member arranged to restrict the attaching / detaching operation of the locking member by the storage operation of the jib. 2. The attachment / detachment device has an urging means for movably holding the jib between a lower surface side and a side surface side of the boom, and urging the movement thereof. The crane device according to claim 1, wherein the jib is arranged so as to restrict the attaching / detaching operation of the locking member only when the jib is on the side surface of the boom. 3. The locking mechanism holds the locking member movably between a locked position and a released position of the locked member, and the attachment / detachment regulating member is configured to store the jib when the jib is stored. Along with the movement to the arrangement, there is provided an abutting portion that abuts against the locking member located on the release position side of the locking position and presses the locking member to the locking position. The crane device according to claim 1 or 2, wherein