JPS6323431Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a device for preventing loosening of a rope for an auxiliary boom.

For cranes equipped with a multi-stage boom consisting of a base boom with a plurality of telescopic boom tubes fitted in a telescopic manner, and an auxiliary boom attached to the front end of the multi-stage boom, it is possible to improve the efficiency of cargo handling work. In order to cope with increased use, a winch drum for cargo handling work using a multi-stage boom and a winch drum for cargo handling work using an auxiliary boom are provided independently. The auxiliary boom can be stored by folding it onto the side of the multi-stage boom or by inserting it into the multi-stage boom, but in either case, when the auxiliary boom is stored, it must be pulled out from the winch drum used for cargo handling by the auxiliary boom. The middle part of the rope is passed through a folding guide provided at the base end of the auxiliary boom or the tip of the base boom, and the tip is fixed to the appropriate position at the tip of the auxiliary boom or to the base that supports the multi-stage boom. There is. By the way, when the auxiliary boom is stored, the rope is neatly wound around the winch drum when the multi-stage boom is horizontal because the fulcrum of the multi-stage boom is located in front of the winch drum for the auxiliary boom. However, when the multi-stage boom was raised, it sometimes became loose and wound up in a disorderly manner. The present invention aims to prevent the occurrence of this problem.

Next, the configuration of the present invention will be explained based on an embodiment shown in the drawings.

Reference numeral 1 denotes a truck crane body, which has a rotatable base 2 at its rear upper part and is equipped with an outrigger 3 for stably supporting the vehicle body 1 by cutting it off the ground during cargo handling operations. A base boom 4 is supported on the base 2 via pins 4', and a multi-stage boom A is formed by fitting a plurality of telescopic boom tubes onto the base boom 4 in a telescopic manner. This multi-stage boom A is raised and raised by a hoisting cylinder 5 interposed between a base end portion of the base boom 4 and the base 2. Reference numeral 6 denotes an auxiliary boom, which is rotatably connected to and detached from the multi-stage boom A through a pivot shaft 7 in a state where it is extended in front of the tip and a state where it is folded and stored on the side of the base boom 4. At the tips of the multi-stage boom A and the auxiliary boom 6, main and sub-hook blocks 8 and 9 for lifting loads are respectively provided. Winch drums 10 and 11 are located spaced apart from each other in the rear.
It is suspended by ropes 12 and 13 pulled out from the ropes so as to be able to move up and down. The sub-hook block 9 consists of a hook a, a support part b that rotatably supports the hook a, and a hook block body C integrally connected to the support part b, and the end of the rope 13 is connected to a pin C within the hook block body C. It is fixed at '.

Reference numeral 14 denotes a folding guide provided at the base end of the auxiliary boom 6, and when the auxiliary boom 6 is folded and stored on the side of the base boom 4 using attachments 15 and 16, the rope 13 is attached to the folding guide. I try to keep it in contact with. This folding guide may be provided at the tip of the base boom 4. When the auxiliary boom 6 is stored, the rope 13 passes through the turn-back guide 14 and the guide 17 provided at the tip of the auxiliary boom 6, and then passes through the rope 13.
It is fixed to the base 2 with pins 18 via sub-hook blocks 9 that support the three ends. Reference numeral 19 denotes support brackets on which the pin 18 is supported, and a pair of support brackets are provided on the left and right sides. Reference numeral 20 denotes a U-shaped stopper, the lower end of which is fixed on the outside of the support brackets 19, 19, and the bent portion thereof is located upward.
When the sub-hook block 9 is rotated about the pin 18 in the lifting direction of the base boom 4, this stopper 20 comes into contact with the sub-hook block 9 and makes further rotation of the sub-hook block 9 impossible. In this contact state, the position of the center of gravity of the sub-hook block 9 with respect to the pin 18 is
A stopper 20 is disposed on the opposite side from the base 2.

Next, the operation will be explained with reference to FIG.

In Figure 2, the two-dot chain line indicates the first
As in the figure, the auxiliary boom 6 is folded and stored on the side surface of the multi-stage boom A, and the auxiliary hook block 9 is shown fixed to the pin 18.

When the base boom 4 is raised from this state with the extension of the hoisting cylinder 5, the rope 13 is loosened between the folding guide 14 and the drum 11, but this slack is absorbed by the weight of the sub-hook block 9. . This state is shown by the solid line in FIG. In this state, the center of gravity of the sub-hook block 9 is located on the opposite side of the base 2 with respect to the pin 18, so next the base boom 4
When the rope 13 is laid down, the rope 13 receives its own gravity due to the weight of the sub-float block 9 as a tension force. Therefore, even when the rope is laid down, a desired tension force is applied to the rope, so that problems such as irregular winding do not occur.

In the above embodiments, the auxiliary boom was folded and stored on the side surface of the base boom, but the auxiliary boom may also be inserted into the multi-stage boom and pulled out when in use. In this case, the folding guide tool 14 is provided at the tip of the base boom 4, and the guide tool 17 is provided at an appropriate location at the base end of the base boom 4.

In summary, since the present invention is constructed as described in the claims of the utility model registration, loosening of the rope for the auxiliary boom can be prevented as much as possible when the auxiliary boom is stored. Since the sub-hook block is not stored separately from the rope end, the sub-hook block can be easily stored.

[Brief explanation of drawings]

FIG. 1 is a side view of a crane showing one embodiment of the present invention, and FIG. 2 is an explanatory view of the operation of the present invention. 2: Base, 4: Base boom, A: Multistage boom,
6: Auxiliary boom, 11: Winch drum, 13:
rope, 14: folding guide, 17: guide,
C: Hook block body, a: Hook, 9: Sub hook block, 20: Stopper.

Claims (1)

[Claims for Utility Model Registration] Used by being attached to the tip of a multi-stage boom, which is equipped with a base boom that is supported on a base so that it can be raised and lowered freely, and a boom tube that is telescopically inserted into the base boom, and when the boom is not used. Sometimes, an auxiliary boom is inserted and stored inside the multi-stage boom or folded and stored on the side of the base boom in the multi-stage boom, and a winch installed on the base is connected to the tip of the auxiliary boom attached to the tip of the multi-stage boom. In a crane comprising a rope that is pulled out and has its tip fixed to a sub-hook block, the sub-hook block is connected to a hook block body to which the tip of the rope is fixed and a hook attached to the lower end of the hook block body. At the same time, a rope folding guide is provided at the tip end of the base boom or the base end of the auxiliary boom, and a bracket is further provided for detachably engaging the hook at an appropriate position on the base. When the auxiliary boom is not in use, the rope between the winch and the sub-hook block is hung around the folding guide, and the hook of the sub-hook block fixed to the tip thereof is engaged with the bracket, and the multi-stage boom is The main body of the hook block is configured to rotate in the same direction as the multi-stage boom is raised, and a stopper is provided on the bracket or at a suitable position on the base near the bracket, and this stopper is configured to rotate when the multi-stage boom is raised. When the elevation angle exceeds a predetermined value, the hook block body is engaged with the hook block body which rotates as the multi-stage boom is raised, thereby preventing rotation of the hook block body in the elevation direction. A device to prevent the rope from loosening for the auxiliary boom.