JP2993785B2 - Hook locking structure of self-propelled crane - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a self-propelled crane such as a crane truck and the like, which relates to a structure in which a lifting hook is locked to prevent the suspension hook from wobbling during traveling.

[0002]

2. Description of the Related Art A self-propelled crane such as a crane truck mounts a swivel on a traveling body, mounts a telescopic boom on the swivel, and installs a hoisting winch and the like.
The telescopic boom is adapted to be raised and lowered by a raising and lowering cylinder, and a suspending hook is suspended via a wire on a sheave pivotally supported at the tip of the telescopic boom, and the hoisting hook winds the wire. It is designed to be raised and lowered by being wound up or extended by a winch. Therefore, when the load is hooked on the lifting hook, the lifting hook is raised by the winding of the wire by the hoisting winch or the erecting operation of the telescopic boom to lift the load.

In this type of self-propelled crane, it is necessary to retract the telescopic boom while the vehicle is running and to move the telescopic boom forward to the retracted state. The hanging hook which hangs down may fluctuate, and in order to prevent this, it is necessary to hook the hanging hook to the vehicle body side and lock it.

[0004]

Conventionally, a ring-shaped anchor is attached to a vehicle body or a swivel base, and the lifting hook is hooked on the anchor ring.

[0005] However, the lifting hook is usually provided with a closing stopper at the tip end opening of the hook portion in the form of a hook in order to prevent the suspended load from coming off. That is, the lifting hook has a closed ring structure by the closing stopper. To lock such a lifting hook to the ring-shaped anchor provided on the vehicle body or the swivel base, both have a ring structure. Then, the worker opens the closing stopper of the lifting hook and dives through the ring-shaped anchoring device, whereby the lifting hook is hooked on the anchoring device.

However, when such a lifting hook is hooked on the anchor, the lifting hook suspended from the tip of the telescopic boom via a wire is brought closer to the anchor provided on the vehicle body or the swivel in advance. It is necessary to move the lifting hooks in a crane operation cab provided on the vehicle body or the swivel base.

In other words, the operation for bringing the lifting hook close to the anchor and the operation for lowering the telescopic boom after the lifting hook is hooked on the anchor are performed in the driver's cab, and the lifting hook is engaged with the anchor. To stop it, it is necessary to perform it at the place of the anchorage outside the cab. If the crane operator intends to perform these series of operations by himself, it is necessary to perform the operations while moving back and forth between the operator's cab and the anchoring device, which is difficult. In addition, if these are to be performed by different workers, extra special workers are required.

The present invention has been made in view of such circumstances, and an object of the present invention is to enable a worker in an operator's cab to easily anchor and release a lifting hook without leaving the operator's cab. And a hook locking structure for a self-propelled crane.

[0009]

Means for Solving the Problems] To solve the above problems
According to the present invention, a turntable is provided on a traveling vehicle body, and the turntable is provided on the turntable.
Equipped with a telescopic boom that can be raised and lowered,
Close the wire to the sheave at the end of the
The hanging hook that forms a closed ring structure
While the vehicle is traveling, attach the lifting hook to the vehicle or swivel
A self-propelled clay that runs while being hooked on the anchors provided
In the hook locking structure for a vehicle,
Position below telescopic boom stored when in line state
And project upward on the support surface of the car body or the swivel base.
The mooring hook is provided with
At least its distal end will be toward the base end of the telescopic boom
To a horizontal plane perpendicular to the vertical direction.
The height of the mooring hook is such that the tip portion that is inclined is moored.
A lifting hook that contacts the support surface at a position where it can engage with the hook;
Is set to face the opening of the
The lifting hook suspended by the wire.
Move sideways from the proximal end to the distal end of the telescopic boom
Pull the lifting hook so that it can be inserted into and removed from the mooring hook.
It is characterized by being hooked and locked.

[0010]

According to the present invention, a lifting hook hanging by a wire is attached to a mooring hook projecting upward from a car body or a swivel base from the base end of the telescopic boom toward the distal end by operating the telescopic boom. And move it sideways,
A lifting hook can be sunk into the slanting tip of the mooring hook in a ring-throw manner, and the lifting hook can be pulled sideways and the lifting hook hooked to the mooring hook is laid down to hang the lifting hook. The state of being locked to the anchor hook can be maintained.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to one embodiment shown in FIGS.

FIG. 3 is a side view showing the crane truck.
Indicates a running vehicle body. The traveling vehicle body 1 is driven by front wheels 2 and rear wheels 3, and at least one of the wheels 2 or 3 is driven by an engine (not shown). Of course, four-wheel drive may be used.

Outriggers 4 are attached to the vehicle body 1 at front, rear, left and right, respectively. These outriggers 4 project to the side of the vehicle body 1 during crane work and are attached to the tips of these outriggers 4 as is well known. The vehicle body 1 is supported by extending the jack 5 and bringing the ground plate 6 at the lower end into contact with the ground.

A swivel 7 is mounted on the vehicle body 1. The swivel 7 is provided with an operator's cab 8 in which the driver can perform both a traveling operation and a crane operation. That is, the operator's cab 8 of the present embodiment is a dual-purpose operator's cab that can be operated in either the traveling operation or the crane operation.

A telescopic boom 10 is mounted on the swivel base 7 so as to be able to be raised and lowered. The telescopic boom 10 connects a plurality of stages of the boom so as to be able to expand and contract, and can be extended by a telescopic cylinder (not shown). An up-and-down cylinder 12 is stretched between the swivel 7 and the lower surface of the base end boom 11, and the up-and-down cylinder 12
Is raised and lowered. Although not shown on the swivel 7,
A winch is provided, by which the wire 17 is wound or unwound.

The distal boom 13 of the telescopic boom 10
A distal end member 14 is provided at the distal end of the head, and sheaves 15 and 16 are rotatably attached to the distal end member 14.

The wire 17 fed from the winch is
Through the intermediate sheaves 18, 19 and the like,
Are wound around the upper sheave 15 and the lower sheave 16, and are suspended from the lower sheave 16. This hanging wire 1
A lifting hook 20 is suspended from 7.

As will be described in detail later, the lifting hook 20 is constituted by connecting a hook portion 22 to a frame 21 so as to be freely rotatable, as shown in FIG. The wire 17 is wound around the lifting sheave 23 freely.

Therefore, when the wire 17 is wound up by the winch while the extension posture and the undulation posture of the telescopic boom 10 are held, the lifting hook 20 is lifted toward the tip constituting member 14, and the wire 17 is lifted. When extended, the lifting hook 20 is lowered. Therefore, a crane operation is performed by hooking a load on the lifting hook 20.

The lifting hook 20 may have the same structure as that of the related art. As shown in FIG. 1, a hook-shaped hook portion 22 is rotatably connected to a frame 21. In this case, the hook portion 22 is attached to the frame 21 via a support shaft 24 and a joint 25 so as to be vertically and horizontally pivotable.

The hook portion 22 is provided with a closing stopper 26 to prevent the suspended load from coming off. The closing stopper 26 is rotatably attached to the base of the hook portion 22 having a hook shape via a pin 27 and is urged by a torsion spring 28 so that the tip of the closing stopper 26 is hooked. The distal end of the hook 22 is in contact with the distal end of the hook 22 from the inside, and the opening of the distal end of the hook 22 is surrounded by a closing ring. Therefore, the wire or the rope of the luggage hooked on the hook portion 22 is held by the closing stopper 26 so as not to come off from the hook portion 22. Lifting hook 2 as above
0 may have the same structure as the conventional one.

In the present embodiment, an anchoring tool is provided at the tip end of the vehicle body 1, that is, an anchoring hook 30 is provided at a position indicated by X in FIG. When the vehicle 1 is running and the telescopic boom 10 is retracted forward, the anchoring hook 30 is located almost directly below the telescopic boom 10, and is provided to protrude from the upper surface 1 a of the vehicle body 1. I have. The base of the anchoring hook 30 extends vertically from the upper surface 1a of the vehicle body 1, but the distal end portion 31 is formed to be inclined obliquely upward toward the rear of the vehicle body 1, that is, toward the base end side of the telescopic boom 10. . The inclination angle θ is an acute angle with respect to the vertical line.

The height of the tip of the mooring hook 30 is
As will be described later, when the lower end of the lifting hook 20 is brought into contact with the upper surface (support surface) 1a of the vehicle body 1 as shown in FIG. ing. In other words, the height of the mooring hook 30 is
The upper surface 1a is located at a position where the portion 31 can engage with the anchor hook 30.
Facing the opening of the ring of the lifting hook 20 that abuts
And so on.

In the vicinity of the anchoring hook 30, the rear of the vehicle body 1 relative to the anchoring hook 30, that is, the telescopic boom 10
A guide plate 35 is provided at the base end of the guide plate 35. The guide plate 35 has a predetermined width in a direction orthogonal to the plane of FIG. 1 and extends vertically from the upper surface 1 a of the vehicle body 1. The distal end 36 of the guide plate 35 is inclined obliquely toward the rear of the vehicle body 1, that is, toward the base end of the telescopic boom 10. The operation of the lifting hook locking structure of the crane truck having such a configuration will be described.

While the crane truck is running, the telescopic boom 10
Is contracted as shown in FIG. In this case, the lifting hook 2 suspended from the distal end constituent member 14 of the telescopic boom 10 by the wire 17 is used.
In order to prevent 0 from wobbling, the lifting hook 20 is hooked on the anchoring hook 30 and locked.

That is, as shown by the imaginary line in FIG. 1, the lifting hook 20 is hooked on the anchoring hook 30, and the frame 21 is laid down so that it falls down forward. It is designed to keep the stationary state. In order to lock the lifting hook 20 to the anchor hook 30 in such a posture, the following operation is performed.

That is, before the telescopic boom 10 is brought into the retracted position as shown in FIG. 3, the telescopic boom 10 is contracted and held in a correct forward position. Then, the standing state of the telescopic boom 10 is adjusted, and the lifting hook 20 suspended from the distal end component member 14 of the telescopic boom 10 by the wire 17 is located directly above a position behind the anchoring hook 30, that is, FIG. As shown in FIG. 3A, the anchoring hook 30 and the guide plate 35 are opposed to each other just above a substantially intermediate position. In this state, the winch is operated to operate the wire 17.
And the lifting hook 20 is lowered. The lowering position of the lifting hook 20 is behind the anchoring hook 30 in the vehicle body.

In this case, as shown in FIG. 1, the hook 20 has a hook-shaped hook portion 22 attached to a frame 21 via a joint 25 so as to be horizontally pivotable. In some cases, the surface (which looks like a ring shape) just descends in a posture facing the paper surface as shown by the solid line in FIG. However, in such a case, the outer surface of the hook portion 22 slides on the guide plate 35, and the direction of the hook portion 22 is changed by the sliding action with the guide plate 35 in the process of descending. It turns to.

This state is shown in FIG. The present invention, as shown in FIG.
By tilting the telescopic boom 10 forward with the lower end of the hook portion 22 floating away from the upper surface 1a of the vehicle body 1, the lifting hook 20 is moved substantially horizontally toward the front (indicated by an arrow a). The tip of the anchoring hook 30 may be inserted into the hook portion 22 of the lifting hook 20 with the tip of the anchoring hook 30 sunk.

However, in this embodiment, in order to perform the insertion operation more reliably, as shown in FIG. 2A, the lower end of the hook portion 22 is floated from the upper surface 1a of the vehicle body 1. Further, the wire 17 is drawn out, the lifting hook 20 is lowered as shown by the arrow b, and the lower end of the hook portion 22 is brought into contact with the upper surface 1a of the vehicle body 1 as shown in FIG.
In this state, the frame 21 of the lifting hook 20 is moved in the direction of arrow c by tilting the telescopic boom 10 forward, and the hook portion 22 is inclined. Due to the inclination of the hook portion 22, the tip of the anchoring hook 30 is inserted under the hook portion 22.

When the telescopic boom 10 is further tilted forward, the frame 21 of the lifting hook 20 falls down as shown in FIG. 2C, and the hook portion 22 remains locked to the anchoring hook 30. Get to sleep.

In this state, the telescopic boom 10 is moved all the way forward and the wire 17 is tensioned by winding the wire 17 with a winch. Then, the lifting hook 20 is moved to the position shown in FIG.
(C) As shown by the arrow d in the figure, the state where the lifting hook 20 is pulled by the wire 17 is maintained, whereby the lifting hook 20 is hooked and locked by the anchor hook 30. In this case, since the tip end of the anchor hook 30 is inclined backward, the lifting hook 20 is prevented from coming off the anchor hook 30.

The above-mentioned locking operation can be locked if the operator operates the crane in the cab 8, that is, operates the telescopic boom 10 to move the lifting hooks 20 in the order shown in FIG. 2. Since there is no need to open and close the closing stopper 26, the operator does not need to go out of the operator's cab 8 to hook the lifting hook 20 to the anchor hook 30. Therefore, the work of locking the lifting hook 20 is simplified, and work efficiency is improved.

When the lifting hook 20 locked as described above is detached from the anchoring hook 30, basically, as shown in FIG.
The case may be reversed. That is, when the operator raises the telescopic boom 10 in the driver's cab 8, the lifting hook 20 that has been locked down on the anchoring hook 30 and has fallen forward is raised rearward. Then, when the telescopic boom 10 is further erected or the wire 17 is wound up after the hook portion 22 becomes substantially vertical, the hook portion 22 becomes the tip portion 31 of the anchoring hook 30 which is inclined rearward and obliquely upward. The hook portion 22 moves obliquely rearward and upward while sliding on the lower surface, and the hook portion 22 automatically comes off the tip portion 31 of the anchoring hook 30.

Therefore, also in this case, it is not necessary for the operator to come out of the operator's cab 8 in order to remove the lifting hook 20 from the mooring hook 30, and the lifting hook 20 can be easily released. In the above embodiment, the case where the anchor hook 30 is provided on the vehicle body 1 has been described, but the anchor hook 30 may be formed on the upper surface of the swivel 7.

Further, in the above embodiment, when the lifting hook 22 is to be locked to the anchoring hook 30, FIG.
As shown in the figure, the lower end of the hook portion 22 is connected to the upper surface 1a of the vehicle body 1.
However, the present invention is not limited to this, and as described above, the lower end of the hook portion 22 is connected to the vehicle body 1 as shown in FIG. The lifting hook 20 may be moved substantially horizontally (indicated by an arrow a) in a state where the lifting hook 20 is away from the upper surface 1a so that the hook portion 22 is locked to the anchor hook 30. Further, as shown in FIG. 4, the structure of the mooring hook may be a structure in which the whole is already inclined from the base. The guide plate 35 may be omitted.

The telescopic boom 10 is not limited to be retracted during running, but may be retracted and stored. In this case, the tip of the anchor hook 30 is inclined forward. Further, the present invention is not limited to the crane vehicles shown in the embodiments, but is applicable to truck cranes and other self-propelled cranes.

[0038]

As described above, according to the present invention, the lifting hook can be locked to the mooring hook by operating the telescopic boom from the cab to move the lifting hook in a substantially horizontal direction. Alternatively, the lifting hook can be removed from the anchoring hook by raising the telescopic boom. Therefore, the operation of locking and releasing the lifting hook can be simplified, and the operator does not need to step down from the operator's cab to operate the locking and releasing of the lifting hook and the anchoring hook. No need for special workers,
Work efficiency is improved. Moreover, it can be realized with a simple structure in which the anchor hook having the above shape is provided on the vehicle body or the swivel base, and the cost is low.

[Brief description of the drawings]

FIG. 1 is a view showing one embodiment of the present invention, and is a diagram showing a detailed structure of a lifting hook and a mooring hook provided in a portion X in FIG. 3;

FIGS. 2A to 2C are explanatory views illustrating an operation of locking the lifting hook to the anchor hook according to the embodiment, and FIGS.

FIG. 3 is a side view showing the entire structure of the crane truck of the embodiment.

FIG. 4 is a view showing the structure of a lifting hook and a mooring hook according to another embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Body, 2, 3 ... Wheel, 7 ... Turning table, 8 ... Driver cab, 1
0 ... Telescopic boom, 12 ... Undulating cylinder, 14 ... Tip component, 17 ... Wire, 20 ... Lifting hook, 21 ... Frame, 22 ... Hook portion, 26 ... Closing stopper, 30 ... Tethering hook, 31 ... Tip inclined portion , 35 ... guide plate.

Claims (1)

(57) [Claims] 1. A swivel base is provided on a traveling vehicle body, and the swivel base is equipped with a telescopic boom that can be raised and lowered.
A hook locking structure of a self-propelled crane that travels in a state where the lifting hook which forms a closed ring structure is suspended by a hook and the above-mentioned lifting hook is hooked on a tether provided on the vehicle body or a swivel table while the traveling vehicle is running in, the tether is positioned below the telescopic boom is stored when the vehicle is in a traveling state of the vehicle or turning base supporting
From the mooring hook that is provided on the holding surface and protrudes upward
Ri, the anchoring hook, at least the tip portion is telescopic boom
To the horizontal plane perpendicular to the vertical direction
The height of the mooring hook is inclined obliquely upward, and the height of the mooring hook is
A lifting hook that contacts the support surface at a position where it can engage with the hook;
Is set to face the opening of the
Ri, so that the hoisting hook engaged is hooked to be inserted into and removed from the anchoring hook is moved sideways toward the front end side of the lifting hook is suspended by the wire from the proximal end side of the telescopic boom A hook locking structure for a self-propelled crane, characterized in that: