Hook device

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

[Technical field]

[0001] The present invention relates to a hook device that allows the sling wire to be removed from a remote location such as the driver's seat of a crane and is provided with a double locking mechanism that reliably prevents the hook from coming off during lifting operations. [Background technology]

[0002] As a hook device suitable for use in conventional harbor and river construction, the two applicants jointly developed a hook as described in Patent Document 1. This hook device uses a crane to hoist a work such as a sling-type base protection block (also called a wave-dissipating base protection block) via a hook that is maintained in a closed state by a lock arm that stops in a locked position under its own weight, and after suspending it at a specified location in a harbor or river, by pulling an operating wire from a remote location such as the driver's seat of the crane, the hook automatically unlocks under its own weight and the sling wire can be removed, eliminating the need for an operator to climb onto the block and perform the work manually, allowing work to be carried out safely and smoothly. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2019-023122 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in this hook device, the hook is merely held in the closed state by a locking arm that stops in the hook engaging position under its own weight. If, during lifting operations, the operating wire gets caught on an external structure or the like and a force is applied in the direction pulling the operating wire, the locking arm will move from the hook engaging position to the hook release position, causing the hook to come off and the workpiece to fall together with the sling wire, which could lead to a serious accident.

[0005] Therefore, the problem that the present invention aims to solve is to solve the above problems, and in a hook device that is configured to safely perform the operation of removing the hook from the workpiece after it has been lowered by remote control, not only does the hook stay in the hook engagement position by its own weight, but also provides an additional locking mechanism to forcibly hold the hook engagement position, thereby preventing the risk of the hook accidentally coming loose during the lifting operation and the workpiece falling. [Means for solving the problem]

[0006] In order to solve this problem, the present invention according to claim 1 comprises a main body having a hanging ring at the upper end, a hook rotatably connected to the lower end of the main body, and a hook that rotates by its own weight. On one side of the body Hook lock position to lock and keep hook closed and the hook release position where the hook is open. The main body can be moved On the other side of the lock arm pin A rotatably connected lock arm; A lock arm operating means is connected to the tip of the lock arm in order to move the lock arm from the hook engaging position to the hook releasing position, and is mounted between the base end of the lock arm and the other end of the main body when the lock arm is in the hook engaging position. The hook device is characterized by comprising a stopper that acts to forcibly hold the lock arm in the hook engaging position, and a stopper operating means for removing the stopper from the lock arm.

[0007] The present invention according to claim 2 is characterized in that, in the hook device according to claim 1, 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 operating wire engaged with stopper means that can be inserted into a space formed in the other end of the lock arm.

[0008] The present invention according to claim 3 is characterized in that in the hook device according to claim 2, both the lock arm operating wire and the stopper operating wire can be remotely controlled.

[0009] The present invention according to a fourth aspect is characterized in that, in the hook device according to the second or third aspect, the lock arm operating wire and the stopper operating wire are painted in different colors. Effect of the Invention

[0010] According to the present invention as set forth in claim 1, a stopper is provided that acts to forcibly hold the lock arm in the hook locking position when attached to the lock arm in the hook locking position, so that even if the lock arm operating means gets caught on an external structure or the like and a pulling force is applied during lifting work using this hook device, the lock arm is forcibly held in the hook locking position and the hook is maintained in the closed state. Therefore, it is possible to prevent the risk of the hook accidentally coming loose during lifting work and the workpiece falling.

[0011] According to the hook device of the present invention, a double locking mechanism for maintaining the hook in a closed state is operated by the lock arm which moves to the hook locking position by its own weight and the stopper which is attached to the lock arm and forcibly holds the hook in the hook locking position. In order to release the hook in a closed state, it is necessary to pull the stopper operating means (wire) to remove the stopper from the lock arm, and further pull the lock arm operating means (wire) to move the lock arm from the hook locking position to the hook release position. The hook will not come off unless the separately provided operating means are separately operated in a predetermined order. As a practical matter, it is almost unthinkable that such an operation will be performed accidentally except by manual operation by an operator, so this hook device is very useful as a very safe hook device.

[0012] Furthermore, according to the present invention as set forth in claim 2, 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, so that one end of each of these operating means (wires) is engaged at a position spaced apart by a distance substantially 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, etc., resulting in a hook device with higher safety.

[0013] Furthermore, according to the present invention as set forth in claim 3, both the lock arm operating means (wire) and the stopper operating means (wire) can be remotely operated, so that an operator can operate these operating means from a remote location, such as the crane operator's seat, eliminating the need for the operator to stand on a block on the water surface and perform the work manually, allowing work to be carried out safely and smoothly.

[0014] Furthermore, according to the present invention as set forth in claim 4, the lock arm operation means (wire) and the stopper operation means (wire) are painted in different colors, making it possible to prevent erroneous operation. [Brief description of the drawings]

[0015] [Figure 1] 1 is a side view showing the overall state of use of the crane hook and the sling wire when a workpiece (not shown) is being hoisted by the hook according to an 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 hook is locked in the closed state by the tip of the hook being locked by the lock arm. [Diagram 2] 2 is an enlarged side view showing the hook and its associated members in FIG. 1. [Diagram 3] FIG. 3 is an enlarged side view showing a main part of FIG. 2 in a further enlarged manner. [Figure 4] 1 is an enlarged side view showing a state in which the lock arm is pulled by an operating wire (lock arm operating means) to move the lock arm from a hook engaging position to a hook releasing position, thereby opening the hook under its own weight. FIG. [Diagram 5] FIG. 5 is an enlarged side view showing a main part of FIG. 4 in a further enlarged manner. BEST MODE FOR CARRYING OUT THEINVENTION

[0016] The structure and operation of a hook according to one embodiment of the present invention will be described in detail below with reference to FIGS.

[0017] The 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.

[0018] A suspension ring 16 is formed at the upper end of the main body 11, which is connected to a crane hook 15 via a suspension material 14 such as a chain sling. The main body 11 is a plate-like member that is generally long and narrow in the vertical direction, with its middle portion protruding in one direction to form a protruding portion 27 (Fig. 3). When a stopper plate 23 (described later) is attached to the lock arm 13, the protruding portion 27 works together with a base end spacer 21b (described later) to forcibly hold the lock arm 13 in the hook-engaged state.

[0019] Hook 12 is rotatably connected to the lower end of main body 11 by hook pin 17, and can be in an open state (Figures 4 and 5) in which it hangs downward due to its own weight, or in a closed state (Figures 1 to 3) in which its tip is locked by lock arm 13, as described below.

[0020] The lock arm 13 has its base end rotatably connected to approximately the center of the main body 11 by a lock arm pin 18, and tends to rotate downward (clockwise in the figure) due to its own weight, so that it can engage the tip of the hook 12 and maintain the hook 12 in the closed state. However, by pulling the lock arm operating wire 20 engaged in the engaging hole 19 at the tip, the lock arm 13 rotates upward (counterclockwise in the figure) and the engagement with the tip of the hook 12 is released, so that the closed state of the hook 12 can be released and it can be moved to the open state.

[0021] In this embodiment, the lock arm 13 is formed by connecting a pair of elongated plate-like members in parallel on both sides of the main body 11 with spacers 21a, 21b, and is configured to lock the tip of the hook 12 by sandwiching it between the pair of elongated plate-like members and between the main body 11 and the tip spacer 21a. A lock arm tip portion 22 having a locking hole 19 is fixed to the outer surface of the tip spacer 21a.

[0022] This hook device 10 further includes a stopper plate 23 that can be attached to the space between the pair of elongated plate-like members constituting the lock arm 13 and between the main body protrusion 27 and the base end spacer 21b when the lock arm 13 is in the hook engagement position, and a stopper operation wire 24 connected to the stopper plate 23 in order to remove the stopper plate 23 attached to the lock arm 13. When the stopper plate 23 is attached to the lock arm 13, even if an operation of pulling the lock arm operation wire 20 is performed on the lock arm 13 that is in the hook engagement position, the main body protrusion 27 of the lock arm 13 and the stopper plate 23 interfere with each other, preventing the lock arm 13 from rotating, and the lock arm 13 is locked at the hook engagement position and forcibly prevented from moving to the hook release position, thereby preventing an accident in which the hook 12 opens and the workpiece falls.

[0023] 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 where they can be operated by a worker on the ground. In order to eliminate operating errors by the worker, these operating wires are colored to be clearly distinguishable from one another; for example, the lock arm operating wire 20 is painted white, and the stopper operating wire 24 is painted red. Furthermore, it is preferable to attach a plate with the word "lock arm" or the like to the lock arm operating wire 20 and the word "stopper" or the like to the stopper operating wire 24 near the part where the worker holds them in his / her hand to prevent operating errors.

[0024] When using this hook device 10 to lift a workpiece (not shown) such as a wave dissipating block or a base protection block, the hook 12 to which the sling wire 26 looped around the workpiece is engaged is closed, and the sling 14 connected to the sling 16 is hooked onto the crane hook 15 for crane operation (Fig. 1). At this time, the tip of the hook 12 is engaged with the lock arm 13 which rotates downward (clockwise in the drawing) under its own weight and stops at the hook engagement position, and the stopper plate 23 attached to the base end of the lock arm 13 prevents the lock arm 13 from rotating from the hook engagement position to the hook release position, so the hook 12 is locked in the closed position. When lifting a workpiece in the state shown in Figures 1 to 3, even if the lock arm operating wire 20 happens to get caught on an external structure or the like and an external force acts to pull the lock arm 13, the stopper blade 13 forcibly prevents the lock arm 13 from rotating, so that the lock arm 13 is securely locked in the hook engagement position, preventing an accident in which the hook 12 accidentally opens and the workpiece falls.

[0025] The workpiece lifted by the hook device 10 is placed at a predetermined location in a harbor or river, and then the sling wire 26 can be removed by a worker from the crane driver's seat or the like by remote control. That is, the worker first pulls the stopper operating wire 24 to remove the stopper 23 from the lock arm 13, and then pulls the lock arm operating wire 20 to rotate the lock arm 13 from the hook locking position (FIGS. 1 to 3) to the hook release position (phantom line in FIG. 2). When the lock arm 13 that has locked the hook 12 moves to the hook release position and the lock on the hook 12 is released, the hook 12 rotates clockwise in the figure by its own weight and moves to the open state (FIGS. 4 and 5), and the sling wire 26 is automatically released. This eliminates the need for a worker to stand on a block on the water surface to remove the sling wire as in the conventional case, and the sling wire 26 can be safely and reliably removed by remote control.

[0026] The hook device according to the present invention has been described in detail above based on the illustrated embodiment, but the present invention is not limited to this and can be implemented with a wide variety of modifications and changes within the scope of the invention described in the claims. [Explanation of symbols]

[0027] 10 Hook device 11 Main unit 12. Hook 13 Lock Arm 14 Hanging material 15 Crane Hook 16 Hanging ring 17 Hook pin 18 Lock arm pin 19 Locking hole 20 Lock arm operating wire 21a, 21b spacer 22 Lock arm tip 23 Stopper plate 24 Stopper operation wire 25 Shackle 26 Sling Wire 27 Body protrusion

Claims

1. a hook device comprising: a main body having a hanging ring at an upper end; a hook rotatably connected to a lower end of the main body; a lock arm rotatably connected to the other side of the main body by a lock arm pin so as to be movable between a hook engagement position where the tip of the hook is engaged with one side of the main body by its own weight to maintain the hook in a closed state, and a hook release position where the hook is in an open state; a lock arm operating means connected to the tip of the lock arm for moving the lock arm from the hook engagement position to the hook release position; a stopper that is attached between the base end of the lock arm and the other end of the main body when the lock arm is in the hook engagement position, thereby acting to forcibly hold the lock arm in the hook engagement position; and a stopper operating means for removing the stopper from the lock arm.

2. 2. The hook device according to claim 1, wherein 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 operating wire engaged with a stopper means that can be inserted into a space formed in the other end of the lock arm.

3. 3. The hook device according to claim 2, wherein both the lock arm operating wire and the stopper operating wire are remotely operable.

4. 4. The hook device according to claim 2, wherein the lock arm operating wire and the stopper operating wire are painted in different colors.

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