JP2547428Y2 - Mobile crane - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a mobile crane, in particular, a mobile type in which the entire upper surface of the telescopic boom is lower than the eye level of an operator seated in a cab when the telescopic boom is in a down state. It relates to cranes.

[0002]

2. Description of the Related Art As shown in FIG. 3, a movable crane of this type includes a swivel 2 having a turntable 3 and a pair of left and right boom support brackets 4 and 5 erected on the turntable 3. The base boom 6a of the telescopic boom 6 is mounted on the undercarriage 1 so as to be freely rotatable, and the base end of the base boom 6a is located between the pair of left and right boom support brackets 4, 5. Boom base bracket 7 and a pair of left and right boom support brackets 4 and 5
And the telescopic boom 6 is connected to the telescopic boom 6
And an up-and-down cylinder 9 interposed between appropriate positions of the swivel base 2 so as to be able to be driven up and down. Operator's cab 10 for both crane operation
Is installed. The telescopic boom 6 is provided with the base boom 6.
a, a plurality of intermediate booms 6b, 6b,... sequentially inserted and retractably inserted into the base end boom 6a, and a distal end boom 6c inserted and retractably inserted into the most advanced intermediate boom 6b. I have.

A goose neck 6d is provided at the distal end of the telescopic boom 6, that is, at the distal end of the distal boom 6c. The goose neck 6d is rotatably mounted on a lower portion of the goose neck 6d via a support shaft 6e. Cars 6f, 6f ... are attached. A hook block 13 is suspended from the tip of the telescopic boom 6 via a wire rope 12 from the winch device 11 that has passed the hook block suspension pulleys 6f, 6f from the winch device 11.

When the mobile crane travels, the hook block 13 is moved by the winch device 11.
And the hook block 13 is directly or indirectly abutted against the distal end of the telescopic boom 6 to position the telescopic boom 6 forward, and the telescopic boom 6 is brought down and down to a forward traveling state. However, in this traveling state, the entire upper surface of the telescopic boom 6 is in the cab 10
It is configured to be lower than the eye height position P of the operator who sits on the vehicle.

[0005] The mobile crane shown in FIG. 3 has a hook block 1 wound up by a winch device 11.
3 is indirectly abutted against the tip of the telescopic boom 6 and positioned. That is, the upper end of the hook block storage arm 6g is swingable at a position on the gooseneck portion 6d at the distal end of the telescopic boom 6 and deviated below the distal end of the telescopic boom 6 from the support shaft 6e. It is pivotally connected. A receiving portion for receiving the upper end portion of the hook block 13 is provided at the lower end portion of the hook block storage arm 6g. When the hook block 13 is wound up, the upper end portion of the hook block 13 comes into contact with the receiving portion. It is supposed to be. By further winding up the hook block 13 after the hook block 13 is received by the receiving portion, the hook block storage arm 6g is rotated rearward,
The hook block 13 is located at a position close to the lower side of the distal end of the telescopic boom 6. When the hook block 13 is located at a position close to the lower side of the tip of the telescopic boom 6, the wire rope 12 is in a tension state. In this case, the hook block 13 is indirectly positioned at the tip of the telescopic boom 6 via the hook block storage arm 6g. This kind of technology is
This is already known in Japanese Patent No. 31256.

[0006] The mobile crane constructed as described above has a telescopic boom 6 which is in a falling state when it is in its traveling and moving state.
Since the upper surface of the telescopic boom 6 is lower than the height position P of the eyes of the operator, the visual field can be secured over the upper surface of the telescopic boom 6. Further, in this type of mobile crane, since the ground height of the tip of the telescopic boom 6 is low in the traveling movement state, as described above, the hook block 1
3 and the hook block 13 is extended to the telescopic boom 6.
Can be positioned by directly or indirectly abutting against the tip of the telescopic boom 6 at the time of traveling movement. Therefore, the positioning of the hook block 13 at the tip of the telescopic boom 6 can be performed simply by winding the winch device 11 up. Have.

In this type of conventional mobile crane, the winch device 11 is mounted on the telescopic boom 6 above the base end of the base end boom 6a (shown by a solid line in FIG. 3), or a swivel base. 2 is arranged on the swivel base 2 so as to be located outside the other boom support bracket 4. However, in the case where the winch device 11 is arranged as in the former case, there is a problem that the winch device 11 hinders the view over the upper surface of the telescopic boom 6 in the traveling state of the movable crane. Furthermore, such an arrangement of the winch device 11 increases the position of the center of gravity of the mobile crane, and adversely affects the stability during traveling movement. In the case where the winch device 11 is arranged as described above, the hook block 13 is connected to the telescopic boom 6.
When the telescopic boom 6 is raised from the traveling state of the mobile crane directly or indirectly positioned at the tip of the telescopic boom without lowering and driving the winch device 11, the wire rope 12 is broken. there were.

[0008]

According to the present invention, in the traveling state, the winch device 11 does not obstruct the view over the upper side of the telescopic boom 6 in the traveling state of the mobile crane, and the hook block 13 is not disturbed. Even if the telescopic boom 6 is raised without operating the winch device 11 to lower it, the wire rope 12 can be moved from the traveling state of the mobile crane, which directly or indirectly abuts the tip of the telescopic boom 6. Is intended to provide a mobile crane that does not break.

[0009]

Means for Solving the Problems To achieve the above object, the mobile crane of the present invention is configured as follows. A swivel 2 having a turntable 3 and a pair of left and right boom support brackets 4 and 5 erected on the turntable 3 is mounted on the lower traveling body 1 so as to be capable of swiveling. With the base end of the side boom 6a positioned between the pair of left and right boom support brackets 4, 5, the boom base bracket 7 on the base end of the base boom 6a and the pair of left and right boom support brackets 4, 5 are moved. The telescopic boom 6 is pivotally connected by an undulating fulcrum shaft 8, and the telescopic boom 6 is configured to be driven up and down by an undulating cylinder 9 interposed between the telescopic boom 6 and a proper position of the swivel base 2. The lower traveling body 1 is positioned outside the support bracket 5.
Is a mobile crane in which a cab 10 for both traveling operation and crane operation is mounted, and a hook block 13 is suspended from a distal end of the telescopic boom 6 by a wire rope 12 from a winch device 11 . In a mobile crane configured such that the entire upper surface of the telescopic boom 6 is lower than the eye level of the operator seated in the cab 10 in the falling state, the winch device 11 is used.
When the telescopic boom 6 is lying down, the upper end of the telescopic boom 6 is located on the side of the most proximal boom 6a of the telescopic boom 6 so that the upper end thereof is lower than the height of the eyes of the operator seated in the cab 10. A mobile crane which is arranged on the side opposite to the side opposite to the above.

[0010]

According to the mobile crane of the present invention configured as described above, the winch device can be moved when the telescopic boom is lying down.
The upper end of the telescopic boom is located on the side of the base end boom of the telescopic boom and on the side opposite to the driver's cab so that the upper end thereof is lower than the eye level of the operator sitting in the cab .
Thus, the winch device 11 does not obstruct the view through the telescopic boom in the traveling state. In addition, since the winch device 11 is disposed at the base end boom of the telescopic boom 6, the traveling movement state of the mobile crane in which the hook block 13 is directly or indirectly abutted against the distal end of the telescopic boom 6, Even when the telescopic boom 6 is raised without driving down the winch device 11, the wire rope 12 is not broken.

[0011]

FIG. 1 shows an embodiment of a mobile crane according to the present invention.
This will be described with reference to FIG. The mobile crane of the present invention has a feature in the mounting position of the winch device 11 as compared with the conventional mobile crane shown in FIG. 3 and described above. Invite what you have explained.

In FIG. 1, the winch device 11 has the most proximal boom 6a of the telescopic boom 6 such that the upper end of the telescopic boom 6 is lower than the height of the eyes of an operator sitting in the cab 10 when the telescopic boom 6 is in the down state. And on the side opposite to the driver's cab 10. In this example, the winch device 11 includes a base end boom 6a corresponding to the front end of the boom support bracket 4 on the opposite side of the cab 10 of the pair of left and right boom support brackets 4, 5.
It is arranged on the side of. In FIG. 1, 14 is
It is a fleet angle fulcrum pulley arranged at the upper end of the proximal end boom 6a, and guides the wire rope 12 from the winch device 11 to the telescopic boom 6 distal end side via the fleet angle fulcrum pulley 14.

In the embodiment of FIG. 1, the winch device 11 is
An example is shown in which a pair of left and right boom support brackets 4 and 5 are arranged adjacent to the front edge of the boom support bracket 4 opposite to the driver's cab 10 and on the side of the corresponding base end boom 6a. As shown in FIG. 2, the winch device 11 includes a driver cab 1 of a pair of left and right boom support brackets 4 and 5.
The base boom 6a may be located outside the boom support bracket 4 on the opposite side of the base boom 6a. In this case, the winch mounting bracket 15 extends from the upper end of the base end of the base end boom 6a of the telescopic boom 6 to the boom support bracket 4 beyond the upper edge of the boom support bracket 4, and the extended winch is provided. The winch device 11 may be fixed to the mounting bracket 15 in a suspended state. In this case, the winch device 11 can be arranged closer to the base end of the base boom 6a as compared with the case where the winch device 11 is arranged as shown in FIG. 1, so that the fleet angle fulcrum pulley arranged at the distal end of the base boom 6a. The distance between the winch device 11 and the winch device 14 can be increased, so that the effect of preventing the winch device from being turbulent can be improved accordingly.

[0014]

[Effects of the Invention] Although the above two embodiments have been described, in any case, the mobile crane of the present invention is an operator whose upper end of the winch device is seated in the operator's cab when the telescopic boom is in the falling state. Is located on the side of the most proximal boom of the telescopic boom and on the side opposite to the driver's cab so as to be at a position lower than the eye height of the telescopic boom. Not only does not obstruct the field of view of the vehicle, but also does not break the wire rope 12 even when the telescopic boom 6 is raised without driving down the winch device 11 from the traveling state. It has an effect.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of a mobile crane according to the present invention.

FIG. 2 is a side view showing another embodiment of the mobile crane of the present invention.

FIG. 3 is a side view of a conventional mobile crane.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Undercarriage 2 Swivel base 3 Turntable 4 Boom support bracket 5 Boom support bracket 6 Telescopic boom 7 Boom base bracket 8 Raised fulcrum shaft 9 Raised cylinder 10 Operator's cab 11 Winch device 12 Wire rope 13 Hook block 14 Fleet angle fulcrum 15 Winch mounting bracket

Claims (1)

(57) [Scope of request for utility model registration] 1. A turntable having a turntable and a pair of left and right boom support brackets erected on the turntable is mounted on a lower traveling body so as to be freely rotatable and driven, and a base end boom of the telescopic boom is provided. With the base end positioned between the pair of left and right boom support brackets, the boom base bracket on the base end of the base boom and the pair of left and right boom support brackets are pivotally connected to each other by a fulcrum shaft, and Can be driven up and down by an up / down cylinder interposed between the telescopic boom and the swivel base in a proper position, and the running operation of the lower traveling body and the crane Install the cab operations combined, made from the tip of the telescopic boom in wire rope from the winch device suspended from a hook block transfer
A Doshiki crane, in the inclined state of the telescopic boom, side throughout on the telescopic boom, in the mobile crane which is configured to be lower than the height of the eyes of the operator seated in the cab, the winch device, telescopic In the falling state of the boom, the upper end is located on the side of the most proximal boom of the telescopic boom and on the side opposite to the cab so that the upper end thereof is lower than the eye level of the operator sitting in the cab. Mobile crane characterized by the following.