JPH0661890U - Hook retractable crane - Google Patents

Abstract

(57) [Abstract] [Purpose] A hook retractable crane that can be stored and arranged in a safe state without the risk of interfering with the load on the loading platform and that can be stably stored with a simple structure. provide. [Structure] A hook main body 4 having a hanging hook 6 at a boom tip 2 is suspended via a wire 3 wound around a winch device, and the hook main body 4 is stored along with the boom 1. In the hook retractable crane configured as described above, the hanging hook 6 is supported by the hook body 4 so as to be rotatable in the horizontal direction when the hook body 4 is retracted.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a hook retractable crane in which a hook is retracted along a boom.

[0002]

[Prior art]

 Conventionally, as a hook retractable crane of this type, as shown in FIGS. 4 and 5, a hook body c is hung from a tip portion a1 of a boom a via a wire b and is also hung on the hook body c. The lower hook c1 is horizontally supported, and is configured to raise and lower the hook body c and the hanging hook c1 by a hoisting / unwinding operation of a winch device (not shown) in which the wire b is wound. When hoisting c, the arm d suspended from the boom tip a contacts the hook body c, and the arm d is turned to the boom a side by using the hoisting force of the wire b by the winch device. By doing so, as shown in FIG. 5, the hook main body c is stored and arranged along the boom a.

[0003]

[Problems to be solved by the device]

 However, in the conventional device described above, when the hook main body c shown in FIG. 5 is stored, the hook main body c is stored along the boom a, but the hanging hook c1 is rotated vertically on the hook main body c. Since it is movably supported, there is a problem that the hanging hook c1 may swing up and down due to vibrations and the like during traveling and may interfere with a load on the loading platform, resulting in damage and danger.

[0004]

[Means for Solving the Problems]

 In the hook retractable crane of the present invention, the hook body having the hanging hook at the boom tip is suspended through the wire wound around the winch device, and the hook body is retracted along the boom. In the hook retractable crane configured as described above, the hanging hook is supported rotatably in the horizontal direction on the hook body when the hook body is retracted.

[0005]

[Action]

 When the crane work is completed and the hook body is retracted along the boom, the hanging hook is supported by the hook body so as to be rotatable in the horizontal direction, so that it can be rotated in the vertical direction. The hanging hook does not swing up and down due to vibrations during traveling.

[0006]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a peripheral portion of a boom tip portion of a hook retractable crane according to the present invention, and FIG. 2 shows a hook body and a hanging hook provided on the hook body.

In the figure, reference numeral 1 denotes a multi-stage telescopic boom (hereinafter simply referred to as a boom) configured to be telescopic, and a hook main body 4 is hung from a boom tip portion 2 via a wire 3.

For example, the boom 1 is configured to be rotatable about a base end portion thereof and to be erected.

The wire 3 is wound around a winch device (not shown) provided on the base end side of the boom 1, and can be wound and unwound by the operation of the winch device.

The tip of the wire 3 is appropriately wound between a pulley 21 provided on the boom tip 2 and a pulley 41 provided on the hook body 4 to suspend the hook body 4.

An arm 5 is suspended from the boom tip portion 2. The arm 5 is rotatably supported by a pivot 52 at a position where an upper end 51 of the pulley 21 is offset from the pivot 22 of the pulley 21 and is rotatable in the extension and contraction direction of the boom 1, and a lower end 53 of the arm 5 is hooked. The contact portion is in contact with the upper end of the main body 4.

An upper end portion 61 of the hanging hook 6 is horizontally supported by a pin 62 on the hook body 4. The pin 62 is arranged in a direction orthogonal to the pivot 42 of the pulley 41, so that the hanging hook 6 is rotatably supported by the hook main body 4 in the horizontal direction during storage.

Further, the boom 1 is provided with a stopper 11 that prevents the hook body 4 from rotating toward the boom 1 side and disposes the hook body 4 at the storage position.

Next, the operation of the hook retractable crane thus configured will be described.

First, when performing a normal crane operation, the hook body 4 and the hanging hook 6 are moved up and down by hoisting or unwinding the wire 3 by the operation of the winch device, and at the same time, the boom is extended, contracted, raised and lowered, and swung. By doing so, the suspended object hooked on the suspension hook 6 is transferred to the target position.

When the crane operation is completed and the hook is to be retracted, first, the boom 1 is expanded, contracted, undulated, and swung while the hook body 4 is hung from the boom tip 2 to an appropriate length by the winch device. Then, the boom 1 is placed in the storage position. After that, the wire 3 is wound up by the winch device to lift the hook body 4 and the hanging hook 6 toward the boom tip 2 side. When the hook body 4 and the hanging hook 6 rise, the lower end portion 53 of the arm 5 provided on the boom tip portion 2 comes into contact with the upper end of the hook body 4.

When the wire 3 is further wound by the winch device with the lower end portion 53 of the arm 5 in contact with the upper end of the hook body 4, the pivot shaft 22 of the pulley 21 and the pivot shaft 52 of the arm 5 are connected to each other. By this offset, the winding force acts to rotate the arm 5 in the clockwise direction in FIG. 1 about the pivot shaft 52, whereby the arm 5 and the hook main body 4 rotate in the clockwise direction. .

In this way, the arm 5 and the hook main body 4 rotate in the clockwise direction, and the hook main body 4 contacts the stopper 11 of the boom 1, so that the hook main body 4 moves to the boom 1 as shown in FIG. Stored along.

Here, when the hook body 4 is stored and arranged, the hanging hook 6 is rotatable in the horizontal direction about the pin 62, and does not rotate in the vertical direction. The suspension hook does not swing up and down due to vibrations during movement, etc., and there is no risk of interfering with a load on the loading platform and the storage hook can be stored and arranged in a safe state.

[0021]

[Effect of device]

 As described above, according to the present invention, when the hook body is retracted, the hook body is arranged along the boom, and the hanging hook pivotally supported on the hook body is horizontally rotated. Since it is freely supported and does not rotate in the vertical direction, the hanging hook does not swing up or down due to vibrations during traveling movement, and there is no risk of interfering with the load on the loading platform, etc. In addition, it can be stored stably with a simple configuration.

[Brief description of drawings]

FIG. 1 is a side view showing a peripheral portion of a boom tip portion of a hook retractable crane according to the present invention.

FIG. 2 is a side view showing a hook body and a hanging hook of a hook retractable crane according to the present invention.

FIG. 3 is a side view showing a state in which the hook body and the hanging hook are stored and arranged.

FIG. 4 is a side view showing a hook main body and a hanging hook of a conventional hook retractable crane.

FIG. 5 is a side view showing a state in which a hook main body and a hanging hook are stored and arranged in a conventional hook retractable crane.

[Explanation of symbols]

 2 Boom tip 3 Wire 4 Hook body 6 Hanging hook

Claims (1)

[Scope of utility model registration request] 1. A hook body having a hanging hook at a boom tip end is hung via a wire wound around a winch device, and the hook body is arranged to be retracted along the boom. A hook retractable crane, wherein the hanging hook is supported by the hook body so as to be horizontally rotatable when the hook body is retracted.