JP2593113Y2 - Jib mountable crane truck - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention provides a boom mounted on a self-propelled vehicle, and a hanging load hook can be hung via two upper and lower sheaves provided at the end of the boom. The present invention relates to a jib-attachable crane truck capable of detachably attaching a jib to a boom tip.

[0002]

2. Description of the Related Art In this type of jib-attachable crane truck, crane work can be performed from the jib tip by attaching a jib to the boom tip or from the boom tip by removing the jib. it can. Also, in this type of jib-attachable crane truck, when traveling, the vehicle travels in a state where the boom is tilted substantially horizontally on the vehicle,
On the other hand, when attaching the downward swing type jib to the boom tip, it is necessary to raise the boom with the base end side of the jib pivotally attached to the boom tip via the jib support.

FIGS. 5 and 6 show a conventional jib-attachable crane truck. FIG. 5 shows a traveling state of the crane truck, and FIG. 6 shows a working state when the downward swing type jib is mounted.

The conventional jib-attachable crane truck shown in FIGS. 5 and 6 has a self-propelled vehicle 101 on which a boom (telescopic boom) 102 is mounted so as to be able to move up and down. An upper sheave 130 and a lower sheave 140 are provided at two upper and lower positions between the upper and lower sheaves 131 so that a hanging load hook can be suspended via the upper and lower sheaves. The jib 107 is configured to be detachably attached. The lower part of the side plate 131 of the boom tip 103 is
Since the lower sheave 140 is attached, the boom 102
Projecting substantially below the lower surface 102a (the downward projecting portion 1).
31a). In this type of crane truck, the lower sheave 140 of the boom tip 103 is used to prevent the wire 118 that suspends the hanging hook from interfering with the boom lower surface 102a during crane operation by the boom 102. , It is necessary to be located considerably below (height H ₁ ) below the boom lower surface 102a.

[0005]

However, in the conventional jib-attachable crane truck shown in FIGS. 5 and 6, the lower portion of the boom tip portion 103 (lower protruding portion 131a) and the lower sheave 140 are located below the boom lower surface 102a. Since the boom 102 is located considerably below, when the boom 102 is stored in a horizontal position as shown in FIG. 5, the lower protruding portion 131a and the lower sheave 140 are positioned at the driver's eye level E in the cab 111.
It will be located at almost the same height as. Therefore, in this conventional jib-attachable crane truck,
There is a problem that the lower protruding portion 131a of the boom tip portion 103 and the lower sheave 140 obstruct the front view from the cab 111.

In this type of jib-attachable crane truck, for example, as shown in FIG. 6, when the jib 107 is hung downward during the jib attaching operation, the jib 1
It is necessary to secure a gap S for preventing the lower end 07 from interfering with the lower protruding portion 131a of the boom tip or the lower sheave 140. In this conventional jib-attachable crane truck, as described above, The lower protruding portion 131a of the tip portion 103 and the lower sheave 140 are
Since it is located considerably lower than 2a, it is necessary to increase the length L of the jib support 106 attached to the boom tip 103 to secure the gap S. As described above, when the length L of the jib support 106 is increased, the weight borne by the boom 102 increases, and there is a problem that performance (for example, extra lifting force) decreases.

[0007] In view of the above-mentioned problems of the conventional jib-attachable crane truck, the present invention makes it possible to widen the field of view from the operator's cab during traveling and to shorten the length of the jib support used when attaching the jib. It is another object of the present invention to provide a jib-attachable crane vehicle capable of reducing the weight borne by the boom.

[0008]

SUMMARY OF THE INVENTION According to the present invention, a boom is mounted on a vehicle having a cab for traveling so that the boom can be raised and lowered, and a hook for lifting a load is provided via two sheaves provided at the end of the boom. In a jib-attachable crane truck in which the jib can be detachably attached to the boom tip via a jib support, the lower sheave at the boom tip is a side plate at the boom tip. It is held by a separate sheave support, and the sheave support is pivotally moved up and down with respect to the side plate at the end of the boom between a lower position where the lower sheave is used and an upper position where it is stored. A vertical driving device is provided between the side plate at the end of the boom and the sheave support for pivoting the sheave support up and down.

[0009]

With the jib-attachable crane truck of the present invention, the lower sheave of the upper and lower sheaves provided at the boom tip is held by the sheave support, and the sheave support is held against the side plate at the boom tip. Since the up-and-down driving device can be pivoted up and down, if the sheave support is raised to the upper position, the sheave support and the lower sheave are held at the upper position (storage position). In this state, the downward projecting width of the sheave support and the lower sheave from the lower surface of the boom is small, and the sheave support and the lower sheave are respectively located above the positions of the lower projecting portion and the lower sheave of the conventional boom tip. Will be located at Therefore, when the vehicle is running (the boom is stored in a substantially horizontal attitude), an effect is obtained in that the forward view from the driver's cab is widened by the amount that the sheave support and the lower sheave are located above.

Further, when the width of the lower end of the sheave support and the lower sheave projecting from the lower surface of the boom is reduced as described above, when the jib is hung down with the boom largely raised during the jib mounting operation, The effect that the jib can be brought closer to the end of the boom by the reduction of the protruding width can be obtained, and as a result, the length of the jib support can be shortened.

When the sheave support is moved down by the vertical drive device when performing the crane operation by the boom, the lower sheave can be held in the normal use position, and the crane operation by the boom can be performed without any trouble. it can.

[0012]

As described above, according to the jib-attachable crane truck of the present invention, the lower sheave and the sheave support of the boom tip are moved up and down with respect to the side plate at the boom tip by the vertical drive device. Since the lower sheave and the sheave support are held at the upper position, the front view from the driver's cab is widened during driving and driving is facilitated. The length of the jib support can be shortened, the weight burden on the boom can be reduced, and the crane performance (for example, extra lifting power) can be improved. Even if the lower sheave can be held at the upper position as described above, the lower sheave can be positioned at the lower movement position by the vertical drive device, so that crane work by the boom can be performed without any trouble. I can do it.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS.
A multi-stage boom (telescopic boom) 2 is mounted on a vehicle 1 having a driving cab 11 for traveling. The telescopic boom 2 is mounted on a swivel (not shown) on the vehicle 1 so as to be horizontally pivotable, and each telescopic boom is telescopically extensible by a telescopic mechanism provided in the boom. And can be freely raised and lowered by the raising and lowering cylinder 20. The driving cab 11 is provided at the front of the vehicle 1.

The boom tip 3 has a pair of left and right side plates 31, 31 at predetermined intervals as shown in FIG. An internal space 32 is formed between the side plates 31. Brackets 33, 33 for supporting sheave supports 41, 41 of a lower sheave block 4, which will be described later, are formed at a lower end of the left and right side plates 31, 31 on the boom tip side so as to protrude downward by a small length. This bracket 33,
The downward protruding length of the 33 from the boom lower surface 2a is, for example, about half the downward protruding length of the conventional boom tip portion 103 from the boom lower surface 102a shown in FIG.

The boom tip 3 is provided with an upper sheave 30 and a lower sheave 40 at two locations above and below it. The upper sheave 30 includes left and right side plates 31, 3 of the boom tip 3.
It is attached between one.

The lower sheave 40 is supported by a shaft 42 between a pair of left and right sheave supports 41, 41 which are separate from the side plates 31, 31 of the boom tip 3. The lower sheave 40, the sheave supports 41, 41 and the shaft 42 constitute the sheave block 4.

The sheave supports 41 are made of a steel plate having an appropriate area and have the same shape.
The shaft 42 of the lower sheave 40 is provided at a position near the center of each of the sheave supports 41, 41. Each of the sheave supports 41 has two protrusions 41 protruding in directions separated by an angle of about 90 to 100 ° about a shaft 42 supporting the lower sheave 40.
a, 41b are formed. Each sheave support 41,
The space between the outer surfaces 41 is designed to be slightly smaller than the space between the inner surfaces between the side plates 31 of the boom tip 3 as shown in FIG.

The lower sheave 40 and both sheave supports 4
The sheave block 4 including the shafts 1 and 41 and the shaft 42 is provided on one of the projecting portions 41 a and 4
1a is pivotally attached to brackets 33, 33 provided below the boom tip side side plates 31, 31 by pivots 13, 13 so as to be vertically pivotable at the bottom of the boom tip 3.

The sheave block 4 is vertically pivoted about pivots 13, 13 by a vertical drive unit 5. The vertical drive device 5 uses a hydraulic cylinder in the illustrated example. The upper end of the hydraulic cylinder 5 is connected to the outer surface of one of the side plates 31 of the boom tip 3 and the lower end of the hydraulic cylinder 5 is connected to a sheave. Axis 4 of block 4
It is connected to 2.

The sheave block 4 is moved by a telescopic operation of a vertical drive unit (hydraulic cylinder) 5 so that the pivot 1
1, the upper half can be accommodated in the internal space 32 between the side plates 31, 31 at the time of upward movement, and substantially at the time of downward movement, as shown in FIG. The whole can be exposed below the lower ends of the upper sheaves 31, 31. In addition, sheave block 4
When the sheave block 4 is located at the upper position (storage position) as shown in FIG. 1, the lower end of the sheave block 4 is substantially the same height as the lower end of the bracket 33 below the side plate 31, and as shown in FIG. In the state where the lower sheave 40 is located at the (use position), the lower sheave 40 can be lowered to a height at which normal crane work by the telescopic boom 2 can be performed.

Pin holes 44, 44 are formed in the sheave supports 41, 41, respectively. On the other hand, pin holes 34, 34 that overlap with the pin holes 44 on the sheave support 41 when the sheave block 4 is at the lower position are formed in the lower portions of the side plates 31, 31 of the boom tip 3 on the side of the boom base end. Have been. And
The pin holes 44, 44 on the sheave support 41, 41 side and the pin holes 34, 34 on the side plate 31, 31 side
By connecting the sheave blocks 4 and 14,
At a lower position with high strength.

As shown in FIG. 3, a jib (ruffing jib) 7 is attached to the boom tip 3 via a jib support 6. The jib support 6 has its base end side pin-coupled to upper, lower, left and right (total four) brackets 36 provided at the distal end of the boom distal end 3, respectively.
It is connected to the front of. The jib 7 has a base end pivotally connected to a tip end of the jib support 6 so as to be able to swing up and down in a vertical plane. The jib 7 is suspended from the jib support 6 and the sub-wire 21 is wound up by a winch on the swivel side, thereby forming the upper mast 22, the connecting rod 23, and the lower mast 24 provided on the jib support 6. , And the tension wire 25 so that the jib support 6 can stand upright. The main hook 18 can be raised and lowered by a winch with the jib 7 standing upright, so that the sub hook 19 can be moved up and down from the jib tip.

In the jib-attachable crane truck of this embodiment, when the vehicle 1 is driven, the sheave block 4 is positioned at the upper position (storage position) by the vertical drive device (hydraulic cylinder) 5 as shown in FIG. Keep it. Then, the downward projecting width of the sheave block 4 (the boom lower surface 2a)
Forward view from the downward projecting width) H ₂ is smaller cab 11 from widens. That is, the lower end of the sheave blocks 4, by a height H ₃ from the lower protruding width H ₁ of the conventional example shown in FIG. 5 can be located above, correspondingly, the front view of the upper side becomes wider. In addition, when the front view is widened in this way,
Driving while the vehicle is running becomes easier.

[0024] Also, in this way, to reduce the downward projecting width of H ₂ from the boom underside 2a of the sheave block 4, at the time of the jib attachment work, the telescopic boom as shown in FIG. 3 2
When lowered drooping jib 7 with the large standing raised state, minutes of reduced the downward projecting width H _2, it is possible to approximate the jib 7 to the boom tip 3, the length M of the jib support 6 as a result Can be shortened. As described above, when the length M of the jib support 6 is reduced, the weight of the jib support 6 can be reduced, and the weight of the telescopic boom 2 can be reduced.

When a crane operation is performed by the telescopic boom 2, the sheave block 4 is moved downward by a vertical drive unit (hydraulic cylinder) 5, as shown in FIG. Then, the lower sheave 40 can be held in the normal use position, and the crane operation by the telescopic boom 2 can be performed without any trouble.

In this embodiment, the vehicle 1 is run or the jib 7 is attached while the sheave block 4 is held at the upper position (storage position). Can be removed from the boom tip 3 as needed. In that case, the respective pivots 13, 13 are pulled out and the hydraulic cylinder 51 is connected to the shaft 42.
(Or separate the hydraulic cylinder 51 from the side plate 31).
Remove from). As described above, if the entire sheave block 4 (or the hydraulic cylinder 51 is included) is removed from the boom tip 3, the weight load on the telescopic boom 2 is reduced by that amount, and the extra lifting force can be further increased. .

In this embodiment, the hydraulic cylinder 5 for moving the sheave block 4 up and down is provided only on the outer surface of the one side plate 31 of the boom tip 3, but the hydraulic cylinder 5 is attached to each side plate 31, 31 may be provided on each outer surface (two in total). Further, when loading and unloading a light-weight object during crane work by the telescopic boom 2, the sheave block 4 can be supported only by the hydraulic cylinder 5 without being fixed by the pin 14.

[Brief description of the drawings]

FIG. 1 is a partial side view of a jib-attachable crane truck according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view taken along the line II-II of FIG.

FIG. 3 is an explanatory view when the jib is mounted on the crane truck in FIG. 1;

FIG. 4 is an explanatory view at the time of crane operation by a boom in the crane truck of FIG. 1;

FIG. 5 is a partial side view of a conventional jib-attachable crane truck.

FIG. 6 is an explanatory view when the jib is mounted on the crane truck in FIG.

[Explanation of symbols]

1 is a vehicle, 2 is a boom (extendable boom), 3 is a boom tip, 4 is a sheave block, 5 is a vertical drive (hydraulic cylinder), 6 is a jib support, 7 is a jib, 11 is a cab,
13 is a pivot, 30 is an upper sheave, 31 is a side plate, 40 is a lower sheave, and 41 is a sheave support.

Claims (1)

(57) [Scope of request for utility model registration] 1. A boom (2) is mounted on a vehicle (1) having a cab (11) for traveling so as to be able to move up and down, and two sheaves (30, 30) provided at a boom tip (3).
The jib (7) can be detachably attached to the boom tip (3) via a jib support (6) so that the hanging hook (17) can be hung via the jig support (6). An attachable crane truck, wherein a lower sheave (40) at the boom tip (3) is held by a sheave support (41) formed separately from a side plate (31) at the boom tip (3), The sheave support (41) can be moved up and down with respect to the side plate (31) of the boom tip (3) between a lower position where the lower sheave (40) is used and an upper position where it is stored. A vertical drive device (5) for pivoting the sheave support (41) up and down between the side plate (31) of the boom tip portion (3) and the sheave support (41). Jib mounting characterized by that Possible type crane truck.