JP2022187836A - hook device - Google Patents

Abstract

To provide a highly safe hook device having a double locking mechanism.SOLUTION: A hook device 10 comprises: a body 11 having a suspension ring 16; a hook 12 rotatably connected to the body; a lock arm 13 that is rotatably connected to the body and that can take a hook locking position (solid line) and a hook releasing position (virtual line); a lock arm operation wire 20 that moves the lock arm from the hook locking position to the hook releasing position; a stopper plate 24 mounted to the lock arm to forcibly hold the lock arm at the hook locking position; and a stopper operation wire 24 for removing the stopper plate from the lock arm. As long as the stopper arm is mounted to the lock arm, the lock arm is held at the hook locking position even when the lock arm operation wire is pulled. Thus, the falling accident of a workpiece caused by unexpected opening of a hook 12 can be prevented.SELECTED DRAWING: Figure 2

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hook device provided with a double locking mechanism that enables the work of removing a slinging wire from a remote location such as the operator's seat of a crane and reliably prevents the hook from coming off during hoisting work. .

As a hook device suitable for use in conventional harbor construction and river construction, the two applicants have jointly developed a hook as described in Patent Document 1. This hook device lifts a workpiece such as a slinged reinforced block (also known as a wave-dissipating reinforced block) with a crane through a hook that is maintained in a closed state by a lock arm that stops at a locked position under its own weight. After suspending the hook at a designated location in a harbor or river, by pulling the operating wire from a remote location such as the operator's seat of a crane, the hook automatically unlocks due to its own weight and the slinging wire can be removed. Workers can safely and smoothly work without the need to ride on blocks and manually work.

JP 2019-023122

However, in this hook device, the hook is only held in the closed state by the lock arm that stops at the hook locking position due to its own weight. When a force acts in the direction of pulling the hook, the lock arm moves from the hook locking position to the hook releasing position, the hook comes off, and there is a danger that the work will fall down together with the slinging wire, leading to a serious accident.

SUMMARY OF THE INVENTION Accordingly, the problem to be solved by the present invention is to solve the above-mentioned problems, and to provide a hook device configured so that the operation of removing the hook from the suspended work can be safely performed by remote control. In addition to stopping at the hook locking position, an additional locking mechanism is provided to forcibly hold the hook locking position, preventing the risk of the hook accidentally coming off and the workpiece dropping during lifting. It is to prevent it before it happens.

In order to solve this problem, the present invention according to claim 1 has a main body having a hanging ring at the upper end, a hook rotatably connected to the lower end of the main body, and the tip of the hook is locked by its own weight. a lock arm rotatably connected to the main body so as to stop at a hook locking position for maintaining the hook in a closed state and to be movable from the hook locking position to the hook opening position by a lock arm operating means; and a stopper operating means for removing the stopper from the locking arm. It is characterized by a hook device.

According to a second aspect of the present invention, in the hook device according to the first aspect, the lock arm operation means is a lock arm operation wire engaged with one end of the lock arm, and the stopper operation means is formed at the other end of the lock arm. and a stopper operating wire that is engaged with stopper means that can be inserted into the space where the stopper is operated.

The present invention according to claim 3 is characterized in that, in the hook device according to claim 2, both the lock arm operation wire and the stopper operation wire can be operated remotely.

The present invention according to claim 4 is characterized in that, in the hook device according to claim 2 or 3, the lock arm operating wire and the stopper operating wire are painted in different colors.

According to the first aspect of the present invention, the stopper is provided to forcefully hold the lock arm at the hook engaging position when the lock arm is attached to the hook engaging position. When the hook device is used for lifting, even if the lock arm operating means is caught by an external structure and a pulling force is applied, the lock arm is forced to the hook locking position. to keep the hook closed. Therefore, it is possible to prevent the work from dropping due to accidental disconnection of the hook during the lifting operation.

According to the hook device of the present invention, the hook is closed by the lock arm that tends to move to the hook locking position by its own weight and the stopper that is attached to the lock arm and forcibly holds the hook locking position. A double locking mechanism will work to keep it in place. In order to open the hook in the closed state, the stopper operation means (wire) is pulled to remove the stopper from the lock arm, and the lock arm operation means (wire) is pulled to release the lock arm from the hook locking position. It must be moved into position and cannot be unhooked unless separately provided operating means are operated separately in a predetermined sequence. Since it is practically unthinkable for such an operation to be carried out inadvertently other than by an operator's manual operation, it is very useful as a highly safe hook device.

Further, according to the second aspect of the present invention, the lock arm operating means (wire) is engaged with one end of the lock arm, and the stopper operating means (wire) is engaged with the stopper means inserted near the other end of the lock arm. Being locked, one end of each of these operating means (wires) will be locked at a position separated by a distance approximately equal to the axial length of the lock arm. Therefore, it is almost impossible for both of these operating means (wires) to get caught on an external structure or the like, resulting in a hook device with higher safety.

Furthermore, according to the third aspect of the present invention, both the lock arm operation means (wire) and the stopper operation means (wire) can be operated remotely, so that the operator can operate them from a remote location such as a crane driver's seat. can be operated, and the operator does not have to stand on a block or the like on the surface of the water and perform the work manually, and the work can be performed safely and smoothly.

Furthermore, according to the fourth aspect of the present invention, since the lock arm operation means (wire) and the stopper operation means (wire) are painted in different colors, erroneous operation can be prevented.

FIG. 2 is a side view showing the overall state of use including a crane hook and a slinging wire when a work (not shown) is lifted by a hook according to one embodiment of the present invention; In this state of use, the lock arm is securely held in the hook-locked state by the stopper, and therefore the tip of the hook is locked in the closed state by being locked by the lock arm. 2 is an enlarged side view showing an enlarged hook and its related members in FIG. 1; FIG. FIG. 3 is an enlarged side view showing a further enlarged portion of FIG. 2; FIG. 10 is an enlarged side view showing a state in which the lock arm is moved from the hook locking position to the hook releasing position by pulling the lock arm with an operating wire (lock arm operating means), thereby opening the hook by its own weight. FIG. 5 is an enlarged side view showing a further enlarged portion of FIG. 4;

The configuration and action of a hook according to an embodiment of the present invention will be described in detail below with reference to FIGS. 1 to 3. FIG.

This hook device 10 has a main body 11, a hook 12 and a lock arm 13, substantially similar to the hook device according to the prior art.

A suspension ring 16 is formed at the upper end of the main body 11 and connected to a crane hook 15 via a suspension member 14 such as a chain sling. The main body 11 is generally a plate-like member elongated in the vertical direction, and an intermediate portion of the main body 11 protrudes in one direction to form a projecting portion 27 (FIG. 3). When the stopper plate 23, which will be described later, is attached to the lock arm 13, the protruding portion 27 cooperates with the base-end spacer 21b, which will be described later, to forcibly hold the lock arm 13 in the hook-locked state. Fulfill.

The hook 12 is rotatably connected to the lower end of the main body 11 by a hook pin 17. The hook 12 hangs downward under its own weight in an open state (FIGS. 4 and 5), and its tip is secured by a lock arm 13 as will be described later. and a locked closed state (FIGS. 1-3).

The base end of the lock arm 13 is rotatably connected to a substantially central portion of the main body 11 by a lock arm pin 18, and the weight of the lock arm 13 tends to rotate downward (clockwise in the drawing). The tip of the hook 12 can be locked to keep the hook 12 closed, but the lock arm 13 can be moved upward (counterclockwise in the figure) by pulling the lock arm operating wire 20 that is locked in the locking hole 19 at the tip. Since the hook 12 is disengaged from the tip of the hook 12, the closed state of the hook 12 can be released and the hook 12 can be shifted to the open state.

In this embodiment, the lock arm 13 is formed by connecting a pair of elongated plate members in parallel on both sides of the main body 11 with spacers 21a and 21b. and the spacer 21a on the distal end side. A locking arm distal end portion 22 having a locking hole 19 is fixed to the outer surface of a distal spacer 21a.

In the hook device 10, when the lock arm 13 is in the hook locking position, the lock arm 13 is provided between the pair of elongated plate-like members constituting the lock arm 13 and between the body projecting portion 27 and the base end side spacer 21b. A stopper plate 23 mountable in the space and a stopper operation wire 24 connected to the stopper plate 23 for removing the stopper plate 23 mounted on the lock arm 13 are provided. When the stopper plate 23 is attached to the lock arm 13, even when the lock arm operating wire 20 is pulled with respect to the lock arm 13 at the hook locking position, the main body of the lock arm 13 does not move. The lock arm 13 cannot be rotated due to the interference between the projecting portion 27 and the stopper plate 23, and the lock arm 13 is locked at the hook engaging position and is forcibly prevented from moving to the hook releasing position. It is possible to prevent an accident in which the cover opens and the work falls.

In this embodiment, both the lock arm operating wire 20 and the stopper operating wire 24 pass through a shackle 25 suspended from the crane hook 15 and extend to a position operable by an operator on the ground. In order to eliminate operation errors by the operator, these operation wires are colored so that they can be clearly distinguished. For example, the lock arm operation wire 20 is painted white and the stopper operation wire 24 is painted red. It is Further, a plate or the like with characters such as "lock arm" attached to the lock arm operation wire 20 and "stopper" attached to the stopper operation wire 24 is attached to prevent erroneous operation. preferably.

When a work (not shown) such as a wave-dissipating block or foot protection block is to be hoisted using this hook device 10, the hook 12 that engages the slinging wire 26 hung around the work is closed. It is carried out by hooking the hanging member 14 connected to the hanging ring 16 to the crane hook 15 and operating the crane (Fig. 1). At this time, the tip of the hook 12 is engaged with the lock arm 13 which rotates downward (clockwise in the figure) by its own weight and stops at the hook engaging position, and is attached to the base end of the lock arm 13. The stopper plate 23 prevents the lock arm 13 from rotating from the hook engaging position to the hook releasing position, so that the hook 12 is locked in the closed state. 1 to 3, even if the lock arm operating wire 20 is hooked on an external structure or the like and an external force acts to pull the lock arm 13, the stopper Since the blade 13 forcibly prevents the rotation of the lock arm 13, the lock arm 13 is securely locked at the hook engaging position, thereby preventing an accident in which the hook 12 is accidentally opened and the work is dropped. .

The operation of removing the slinging wire 26 after the work lifted using the hook device 10 is installed at a predetermined location in a harbor or river can be remotely controlled by an operator from the crane operator's seat. That is, the operator first removes the stopper 23 from the lock arm 13 by pulling the stopper operating wire 24, and then pulls the lock arm operating wire 20 to move the lock arm 13 to the hook locking position (FIGS. 1 to 3). ) to the hook release position (virtual line in FIG. 2). When the lock arm 13 that has locked the hook 12 moves to the hook open position and the lock on the hook 12 is released, the hook 12 rotates clockwise in the figure by its own weight and enters the open state ( 4, FIG. 5), the slinging wire 26 is automatically removed. Therefore, it is not necessary for a worker to remove the slinging wire by standing on a block on the surface of the water as in the conventional case, and the slinging wire 26 can be removed safely and reliably by remote control.

Although the hook device according to the present invention has been described in detail above based on the illustrated embodiments, the present invention is not limited to this, and can be variously modified or modified within the scope of the invention described in the claims. can be implemented by

10 Hook device 11 Main body 12 Hook 13 Lock arm 14 Suspension member 15 Crane hook 16 Suspension ring 17 Hook pin 18 Lock arm pin 19 Locking hole 20 Lock arm operation wires 21a, 21b Spacer 22 Lock arm tip 23 Stopper plate 24 Stopper operation wire 25 Shackle 26 Slinging wire 27 Main body protrusion

Claims (4)

A main body having a hanging ring at the upper end, a hook rotatably connected to the lower end of the main body, and the tip of the hook is locked by its own weight to keep the hook closed. A lock arm rotatably connected to the main body so as to be movable from a hook locking position to a hook releasing position by an arm operating means, and a lock arm that hooks when attached to the lock arm at the hook locking position. A hook device comprising a stopper for forcibly holding the hook at a stop position and a stopper operating means for removing the stopper from the lock arm. The lock arm operating means is a lock arm operating wire engaged with one end of the lock arm, and the stopper operating means is a stopper engaged with stopper means that can be inserted into a space formed at the other end of the lock arm. A hook device according to claim 1, characterized in that it is an operating wire. 3. The hook device according to claim 2, wherein both the lock arm operating wire and the stopper operating wire are remotely operable. 4. The hook device according to claim 2, wherein said lock arm operating wire and said stopper operating wire are painted in different colors.

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