JPH054314B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention includes a chain block that can rotate near the top of a truck loading platform, horizontally move in any direction, and move up and down, and an arm lock device that prevents arm rotation. This relates to truck cranes.

[Conventional technology] Conventionally, as a truck crane, (1)
As disclosed in Publication No. 65085, a support column is fixed with a clamp to a support frame fixed to the front part of the loading platform of a truck, and the base end of a horizontal first arm is attached to the upper end of the column. A truck crane having a structure in which the base end of a second arm is pivotally connected to the tip of the first arm by a vertical shaft, and a hoist is attached to the tip of the second arm. ) As disclosed in Japanese Utility Model Publication No. 54-39798, the lower part of the support is fixed to the front of the truck bed, and a swing support located at a lower level than the roof of the driver's cabin is attached to the top of the support. The proximal end of the telescopic boom, which is rotatably fitted and consists of an outer cylinder, an inner cylinder slidably fitted into the outer cylinder, and a rack and pinion type telescoping device, is attached to the lower part of the swing column by a horizontal shaft. A plurality of locking holes are provided in the inner cylinder, a locking plug pressed by a spring is attached to the outer cylinder, a chain block is installed at the tip of the telescoping boom, and a locking chain is installed. A truck crane is known which has a structure in which one end of the locking chain is connected and a link of the locking chain is locked to a locking member attached to the upper end of the swing column.

[Problem to be solved by the invention]

In the case of the truck crane mentioned in (1) above, in order to increase the lifting height of the hoist, it is necessary to increase the height of the support, but if the height of the support is increased,
Since the height of the truck crane increases, it is necessary to increase the height of the covered garage in which the truck crane is stored, which increases the construction cost of the covered garage. Additionally, existing garages with low roofs cannot accommodate truck cranes. Furthermore, as the height of the truck crane increases, stability during travel deteriorates.

In the case of the truck crane described in (2) above, the telescopic boom has a complicated structure, is heavy, and is expensive. When adjusting the elevation angle of the telescopic boom, the entire heavy telescopic boom must be supported by hand. Since it is necessary to rotate upward or downward, the operability of adjusting the elevation angle is poor, and furthermore, the base end of the telescoping boom is pivoted to the lower part of the swing column located at a position lower than the roof of the operator's cab. Because of this, it is not possible to load items high on the platform near the support and swivel supports, which reduces the truck's loading capacity, and the telescopic boom cannot be supported vertically, so chain blocks are used. It is not possible to bring the lifted load close to the support.

This invention allows the height of the truck crane to be lowered when the truck crane is traveling and when it is stored, and also allows the cargo to be loaded at a high height even in a position near the operator's cab on the loading platform.Furthermore, the structure is simple. To provide a truck crane having an arm locking device which can be manufactured at low cost, allows easy height adjustment of a chain block, and locks the arm with a simple device to prevent the arm from turning when the truck crane is traveling. The purpose is to

[Means to solve the problem]

In order to achieve the above object, in the truck crane having the arm lock device of the present invention, the base end of the horizontal first arm 3 disposed above the loading platform 4 of the truck 1 is fixed to the loading platform 4 of the truck 1. The base end of the second arm 7 is pivotally connected to the pivot support member 8 by a horizontal shaft 9, and the base end of the second arm 7 is rotatably fitted to the vertical shaft 6 fixed to the upper part of the support frame 5. The support member 8 is rotatably attached to the tip of the first arm 3 about a vertical shaft 10, and a guide rail 11 extending horizontally at the bottom of the second arm 7 is fixed to the swing support member 8, and A proximal end of a support leg 12 for upwardly tilted support of the second arm is foldably attached to the intermediate portion of the second arm 7 by a horizontal shaft 13, and the guide rail 11 is attached to the tip of the support leg 12 for upwardly tilted support of the second arm. A guide member 14 is provided which is guided by the second arm 7.
A chain block 15 is attached to the tip of the
An arm lock fitting 17 fitted to the second arm 7 is fixed to the upper part of the vertical shaft 6.

[Effect]

When the first arm 3 is rotated around the vertical axis 6 with respect to the support frame 5, the chain block 15 attached to the tip of the second arm 7 is rotated around the vertical axis 6, and the second arm 7 is rotated around the vertical axis 6. When the chain block 15 is rotated about the vertical axis 10 with respect to the first arm 3, the turning radius of the chain block 15 can be adjusted to an arbitrary size. Further, in a state where the second arm 7 is rotated upward about the horizontal axis 9 and tilted upward, the middle part of the second arm 7 is supported by the guide rail 11 via the supporting leg 12 for supporting the upwardly tilted second arm. When the chain block 15 is supported, the chain block 15 is supported at a high level position, and when the second arm 7 is laid down with the second arm upwardly tilted support leg 12 folded relative to the second arm 7, the chain block 15 is at a low level. Supported in level position.

The first arm 3 is connected to the vertical axis 6 relative to the support frame 5.
The chain block 15 can be moved in any horizontal direction by rotating the second arm 7 about the vertical axis 10 relative to the tip of the first arm 3.

Moreover, when the second arm 7 and the guide rail 11 are rotated to a position where they overlap with the upper part of the first arm 3,
The first arm 3, the second arm 7, and the guide rail 11 are folded so as not to be bulky. Furthermore, the first arm 3 is arranged to extend through the lower part of the arm lock fitting 17, and the second arm 7, which is erected in an inclined state, is arranged in a position overlapping the first arm 3. , second
When the arm 7 is rotated to lie down and fitted into the arm lock fitting 17, the first arm 3 and the second arm 7 are locked so that they do not rotate.

〔Example〕

Next, the present invention will be explained in detail using illustrated examples.

FIGS. 1 to 17 show an embodiment of the present invention, in which a support frame 5 is constructed by fixing a support column 20 to a frame body 19 that is provided with mounting seats 18 on both left and right sides. The support frame 5 is placed on the front end of the loading platform 4 of the truck 1 and is removably fixed with bolts 21, and the lower part of the vertical shaft 6 is fixed to the upper end of the support column 20. The base end of the horizontal first arm 3, which is disposed at a slightly higher level than the roof of the first arm 3, is fitted to the vertical shaft 6 via a bearing so as to be rotatable and not move in the vertical direction.
Further, a vertical shaft 10, which is integrally provided at the lower part of the swing support member 8, is attached to the tip of the first arm 3 via a bearing so as to be rotatable and not move in the vertical direction. The proximal end portion of is pivotally connected to the pivot support member 8 by a horizontal shaft 9.

A guide rail 11 with an upwardly opening groove-shaped cross-section and an inwardly directed flange at its upper part is disposed to extend horizontally at the lower part of the second arm 7, and the guide rail 11 has an upwardly-opening groove-shaped cross section in the lower part of the guide rail 11. A cross-sectional reinforcing member 22 is fixed by welding, and the base ends of the guide rail 11 and the reinforcing member 22 are fixed to the swing support member 8 by welding. body 23 in
, the lower end of the metal plate support fitting 24 is connected to the bolt 25.
The upper end of the support fitting 24 is detachably connected to the tip of the second arm 7 by a bolt 26.

Second arm upwardly tilted support leg 1 with groove-shaped cross section
The base end of the support leg 12 is pivotally attached to the middle of the second arm 7 by a horizontal shaft 13 above a position close to the tip of the guide rail 11, and on both left and right sides of the tip of the support leg 12, a disc-shaped The guide members 14 are fixed or rotatably attached, and each guide member 14 is movably fitted into grooves on both left and right sides of the guide rail 11, and furthermore, a handle 27 for rotating the support leg is provided on the distal end side of the support leg 12. is attached, and a stopper 28 for engaging the guide member 14 is fixed to the distal end of the guide rail 11. When the guide member 14 is engaged with the stopper 28, the distal end side of the support leg 12 is attached to the second arm 7. The second arm 7 is supported in an upwardly inclined state, being inclined so as to be deviated toward the distal end side. Further, the spring support fitting 29 fixed to the second arm upwardly tilted support support leg 12 and the second arm 7
The spring support fitting 30 fixed to is connected via a tension spring 31 for rotation in the direction of protrusion of the support leg.

An engagement fitting 33 for engaging the lower hook 32 of the chain block 15 is fixed to the upper rear part of the support column 20, and extends in the arm longitudinal direction to the upper part of the base end side of the first arm 3. The rear part of the support member 35, which is a horizontal plate extending in the front-rear direction and to which the rotation stopper 34 is fixed, is connected to the vertical axis 6.
A fixed position stopper 37 is placed on the upper end surface and fixed by a plurality of screws 36, and fixed to the lower part of the support member 35 for engaging the rotation stopper 34. The extending groove-shaped receiving fitting 38 is connected to the supporting member 3.
5 and is fixed by welding.

A second arm fitting groove 1 is provided in the groove-shaped receiving fitting 38.
6 is provided, and the arm lock fitting 17 is constituted by the support member 35 and the groove-shaped receiving fitting 38. As shown in FIG. When the first arm 3 is rotated until it hits the fixed position stopper 37, and the second arm 7 is rotated from a position overlapping the first arm 3, as shown in FIGS. 16 and 17. First, the second arm 7 is fitted into the groove-shaped receiving fitting 38, and the first arm 3 and the second arm 7 are locked against rotation. After locking the first arm 3 and the second arm 7 so that they do not rotate, the lower hook 32 of the chain block 15 is engaged with the engagement fitting 33 fixed to the column 20, and the chain block 1
If the load chain 39 of No. 5 is tensed, even if the truck crane vibrates in the vertical direction while traveling, the second
It is possible to prevent the arm 7 from shaking in the vertical direction.

1 and 2 show the chain block 15.
The first arm 3 and the second arm 7 are shown disposed at a low level and above the loading platform 4 of the truck 1 for loading and unloading cargo. When moving the chain block 15 from a low level position to a high level position, the second arm 7
When the worker pushes up with his hand and rotates upward about the horizontal shaft 9, the support leg 12 projects downward from the second arm 7 due to the tension of the tension spring 31 for rotation in the direction of protrusion of the support leg. When the guide member 14 at the tip of the upwardly tilted support leg 12 of the second arm hits the stopper 28 at the tip of the guide rail 11, let go of the second arm 7. Even if the guide rail 11 supports the guide member 14 and the support leg 12, the second arm 7
The chain block 15 is supported in a diagonally upwardly erect state, so that the chain block 15 is held at a high level position, as shown in FIG.

In addition, when moving the chain block 15 from a high level position to a low level position, the worker supports the second arm 7 with one hand and moves the rotation handle 27 to the base end side of the guide rail 11 with the other hand. The support leg 12 is rotated in the folding direction by pressing the support leg 12 in the direction of folding, and the second arm 7 is rotated in the folding direction.

When running the truck crane or storing it in a garage, as shown in FIG. The first arm 3 is arranged so as to stand up diagonally upward, and then the first arm 3 is placed so as to overlap with the first arm 3.
As shown in the figure, the second arm 7 is rotated to fall down and fitted into the groove-shaped receiving fitting 38. When the truck crane is to be run, the lower hook 32 of the chain block 15 is engaged with the engagement fitting 33 to tension the load chain 39.

18 and 19 show other examples of arm lock devices, and in the case of FIG. 18,
The lower part of a vertical engagement pin 40 is fixed to the front part of the support member 35 to constitute an arm lock fitting 17, and the lower part of the second arm 7 has a pin hole into which the engagement pin 40 is inserted. 41 is provided. In the case of FIG. 19, the groove-shaped receiving fitting 38 is placed on the support member 35 above the vertical shaft 6 and fixed by welding.

When carrying out this invention, the stopper 28 may be omitted and a stopper for stopping the rotation in the protruding direction of the leg that engages with the supporting leg 12 may be fixed to the second arm 7, and The spring 31 may be omitted. The engaging metal fitting 33 may be fixed to the frame body 19 instead of being fixed to the column 20.

〔Effect of the invention〕

Since the present invention is configured as described above, it produces the effects described below.

By folding the second arm upwardly tilted support leg 12 so as to overlap the second arm 7, and lowering the second arm 7 supporting the chain block 15, the center of gravity of the truck crane is lowered and the truck crane is lowered. Since the height of the crane can be lowered, the truck crane can be run in a stable state and can be stored in a garage with a low roof. The chain block 1
5 can be held at a high level position to increase the lifting height of the chain block 15.Furthermore, the supporting leg 12 can be simply folded so as to overlap the second arm 7, and the second arm 7 can be laid down, or the second arm 7 can be By performing a simple operation of rotating the arm 7 upward and supporting it by the support leg 12 protruding from the second arm 7, the chain block 15 can be
The level of the chain block 15 can be easily adjusted, and the level of the chain block 15 can be adjusted by rotating the second arm 7 in the vertical direction without the need to rotate the first arm 3 in the vertical direction. Therefore, the vertical rotation operation can be performed with a relatively small force.

In addition, by appropriately combining the rotation of the first arm 3 and the rotation of the second arm 7, the loading platform
Luggage can be loaded near the support frame 5, and even near the support frame 5, the load can be loaded high on the loading platform 4. Moreover, especially in the case of this invention, the first arm 3
is arranged so as to extend through the lower part of the arm lock fitting 17, and the second arm 7, which is erected in an inclined state, is arranged in a position overlapping above the first arm 3, and then the second arm 7 is laid down. By performing a simple operation of rotating and fitting into the groove 16 of the arm lock fitting 17, the first arm 3
Moreover, the second arm 7 can be locked so as not to rotate, and the structure of the rotation locking device is also simple.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a partially longitudinal side view showing a truck crane in which the first and second arms are arranged in series and the chain block is arranged at a low level. Figure 2 is a partially cutaway vertical side view showing an enlarged part of Figure 1, and Figure 3 is an A--
4 is an enlarged sectional view taken along the line B-B in FIG. 2, FIG. 5 is an enlarged sectional view taken along the line C-C in FIG. 2,
Fig. 6 is a partially longitudinal side view showing the chain block attachment part at the tip of the second arm, Fig. 7 is a partially longitudinal side view showing the vicinity of the arm lock fitting, Fig. 8 is its plan view, and Fig. 9 is the Sectional view taken along line D-D in Figure 7, 1st
FIG. 0 is a partially longitudinal side view showing a state in which the second arm 7 of the truck crane is tilted upward;
FIG. 11 is a partially cutaway vertical side view showing an enlarged part of FIG. 10, and FIG.
A partially longitudinal side view showing a state in which the arm has been rotated to a predetermined position above the driver's cab in a truck, and FIG. 13 shows a state in which the rotation stopper of the first arm is engaged with the fixed position stopper of the arm lock fitting. A side view, FIG. 14 is a sectional view taken along line E-E in FIG. 13,
FIG. 15 is a partially longitudinal side view showing the crane in a folded state above the driver's cab of the truck;
Figure 16 is a side view showing the anti-swivel locking device in a folded crane;
It is a sectional view taken along the line FF in the figure. Figure 18 and 1
FIG. 9 is a partially longitudinal side view showing another example of the arm lock device. In the figure, 1 is a truck, 2 is a driver's cab, 3 is a first arm, 4 is a loading platform, 5 is a support frame, 6 is a vertical axis, 7 is a second arm, 8 is a swing support member, 9 is a horizontal axis, 10 is a vertical axis, 11 is a guide rail, 12 is a support leg for supporting the second arm upwardly tilted, 13 is a horizontal axis,
14 is a guide member, 15 is a chain block, 1
6 is a groove for fitting the second arm, 17 is an arm lock fitting, 20 is a column, 27 is a rotating handle, 28 is a stopper, 31 is a tension spring for rotating the supporting leg in the protruding direction, 34
is a rotation stopper, 35 is a support member, 36 is a screw,
37 is a fixed position stopper, and 38 is a groove-shaped receiving fitting.

Claims (1)

[Claims] 1 The base end of the horizontal first arm 3 placed above the loading platform 4 of the truck 1 rotates about the vertical axis 6 fixed to the upper part of the support frame 5 fixed to the loading platform 4 of the truck 1. The base end of the second arm 7 is pivotally attached to a pivot support member 8 about a horizontal shaft 9, and the pivot support member 8 is rotatably attached to the distal end of the first arm 3 about a vertical shaft 10. A guide rail 11 is fixed to the swing support member 8 and extends horizontally at the lower part of the second arm 7, and is attached to the middle part of the second arm 7 at the base of the support leg 12 for upwardly tilting support of the second arm. The end portion of the second arm is foldably attached to the horizontal shaft 13, and a guide member 14 guided by the guide rail 11 is provided at the tip of the second arm upwardly inclined supporting support leg 12.
A chain block 15 is attached to the tip of the
A truck crane having an arm lock device in which an arm lock fitting 17 fitted to the second arm 7 is fixed to the upper part of the vertical shaft 6.