JP7598397B2 - Mechanism for attaching and detaching a sling in a heavy load suspension device - Google Patents

Description

The present invention relates to devices for suspending heavy objects, such as cranes, and in particular to the attachment and detachment of mechanisms for preventing the sling from coming loose when slinging or removing the sling.

Various proposals have been made to prevent devices such as cranes from coming off when used to suspend heavy loads. For example, Patent Document 1 discloses a hook with a stopper for slinging and fastening that is equipped with an inward-opening stopper that prevents the slinging and fastening member hung on the hook from coming off, and a lock lever that prevents the stopper from opening from the closed position of the hook opening, and does not require machining of the hook body for the notch that engages the lock lever, and also makes it easy to repair damaged notches.

Figure 12 is a diagram to explain the conventional ball removal process.

When removing the sling, the wire rope 110 attached around the heavy load to be suspended is removed from the hook 101. An anti-slip device 102 is attached to the hook 101. The worker hooks the hand hook 120 onto the hand hook portion 104 of the anti-slip device 102 and lifts the anti-slip device 102 to release the hook 101 from its stopper. With the stopper released, the crane operator operates the crane to remove the wire rope 110 from the hook 101, completing the sling removal work. The procedure for slinging is the opposite of this.

JP 2021-169362 A

However, in the above-mentioned conventional slinging and removal work, the crane is operated with the hand hook attached to the hand hook portion of the sling prevention device, which creates the risk of injury due to interference with the hook or wire. In addition, there are cases where the work is done on unstable footing, which creates the risk of injury due to falling.

The present invention has been made in consideration of the above problems, and aims to provide a mechanism for attaching and detaching a sling in a heavy load suspension device that allows the safe attachment and detachment of a locking mechanism when slinging and removing the sling.

In order to solve the above problems, the present invention provides a sling attachment/detachment mechanism for a heavy load suspension device, which includes a hook and a hook winding means, and a locking device that extends vertically from the base of the hook to the tip of the hook to close the opening of the hook. The mechanism is characterized in that the hook is hooked to the center of a sling having a load suspension part to which a heavy load is attached, and a hook receiving part is provided, where the hook is hooked to the center of the sling, and a sloping part with a sloping surface that slopes diagonally upward from both the left and right ends of the hook receiving part, and a rod-shaped lateral protrusion is provided that protrudes horizontally to the outside of the lateral side of the hook locking device, and the sloping surface is slid by operating the winding means to bring the lateral protrusion into contact with the sloping surface of the sloping part and open and close the hook locking device.

Here, the side protrusions are preferably provided on both the left and right sides of the hook removal prevention device, the inclined surfaces of the inclined portions are preferably provided corresponding to the left and right side protrusions, and the inclined surfaces of the inclined portions are preferably inclined toward the side opposite to the hook removal side of the hook receiving portion.

According to this, the sling that suspends the load has a hook receiving portion and an inclined portion, the hook anti-detachment device has a side protrusion, and the side protrusion is brought into contact with the inclined surface of the inclined portion by operating the crane, and the inclined surface is slid to open and close the hook anti-detachment device to attach and detach the hook, thereby realizing a sling attachment/detachment mechanism for a heavy load hoisting device that can safely attach and detach the anti-detachment mechanism when slinging and detaching the sling.

The present invention can also be configured as a sling for a heavy load suspension device, comprising a hook and a hook winding means, and a device for preventing the hook from coming off extending vertically from the base of the hook to the tip of the hook to close the opening of the hook, the sling comprising a load slinging part to which a heavy load is attached, a hook receiving part to which the hook is hooked at the center of the sling, and an inclined part having an inclined surface that slopes diagonally upward from both the left and right ends of the hook receiving part, and a rod-shaped lateral protrusion that protrudes horizontally to the outside of the side of the hook prevention device comes into contact with the inclined surface of the inclined part by operating the winding means, and slides on the inclined surface to open and close the hook prevention device.

Furthermore, the present invention may be a hook for a heavy load suspension device, which includes a hook and a hook winding means, and is provided with a fall prevention device that extends vertically from the base of the hook to the tip of the hook to close the opening of the hook, and which has a rod-shaped lateral protrusion that protrudes horizontally to the outside of the side of the hook fall prevention device, and which, by operating the winding means, comes into contact with the inclined surface of a sling that includes a load sling to which a heavy load is attached, a hook receiving portion to which the hook is hooked at the center of the sling, and an inclined portion having an inclined surface that slopes diagonally upward from both the left and right ends of the hook receiving portion, and which slides on the inclined surface to open and close the hook fall prevention device.

As described above, the hanging device attachment/detachment mechanism in the heavy load hoisting device of the present invention provides a hook receiving portion and an inclined portion on the hoisting device that suspends the load, provides a side protrusion on the hook's anti-detachment device, and allows the side protrusion to come into contact with the inclined surface of the inclined portion by simply operating the crane, sliding the inclined surface to open and close the hook anti-detachment device and attach/detach the hook, so that the anti-detachment mechanism can be safely attached and detached when slinging and detaching the heavy load hoisting device.

FIG. 2 is a diagram showing a configuration example of a suspending tool of a suspension device. FIG. 4 is an enlarged side view showing the vicinity of the inclined portion of the hoisting tool. FIG. 4 is an enlarged front view showing the vicinity of the inclined portion of the hoisting tool. FIG. 2 is an enlarged front view showing the vicinity of the suspension part of the suspension device. FIG. 2 is an enlarged side view showing the vicinity of the suspension part of the suspension device. A diagram to explain the procedure for removing the ball using the suspension device. A diagram to explain the procedure for removing the ball using the suspension device. A diagram to explain the procedure for removing the ball using the suspension device. A diagram to explain the procedure for removing the ball using the suspension device. A diagram to explain the procedure for removing the ball using the suspension device. A diagram to explain the procedure for removing the ball using the suspension device. FIG. 13 is a diagram for explaining the conventional ball removal process.

The following describes the mechanism for attaching and detaching the sling in the heavy load suspension device according to the present invention, with reference to the drawings.

The heavy load suspending device of this embodiment is a device for suspending heavy loads, such as a crane, and is composed of a suspending part, such as a hook at the tip of the crane, a hoisting means, such as a crane, for hoisting the suspending part, and a hoisting tool to which a load (heavy load) is attached and suspended from the suspending part.

Figure 1 shows an example of the configuration of the suspension device's suspending tool.

The sling 10 is a member for attaching and suspending a load (heavy object), and comprises an inclined portion 11, a hook receiving portion 12, and a load suspending portion 13. The sling 10 is formed, for example, in the shape of the character "工" and has load suspending portions 13 from which a load is suspended at its four corners. The shape of the sling 10 is not limited to the shape shown in Figure 1, but since the load suspended by the load suspending portions 13 is a heavy object, and considering the weight balance, it is preferable that the load suspending portions 13 be provided at positions that are equidistant from the center of the sling 10, and it can be said that the shape shown in Figure 1 is one of the optimal shapes.

The inclined portion 11 and the hook receiving portion 12 are members that connect to the hanging portion of the suspension device, and are provided so as to be located at the center (center of gravity) of the sling 10 from the viewpoint of the weight balance described above. Here, an example is shown in which the inclined portion 11 and the hook receiving portion 12 are provided from the top surface of the sling 10 toward the top.

Figure 2 is an enlarged side view showing the vicinity of the inclined portion 11 of the sling, and Figure 3 is a front view of the same.

The hook receiving portion 12 is a cylindrical member onto which the hook, which is the hanging portion of the suspension device, is hooked.

The inclined portion 11 is a member that extends obliquely upward from positions near both the left and right ends of the hook receiving portion 12. The inclined portion 11 has an inclined surface 11a that extends upward at an angle of approximately 65° from the horizontal. The lateral protrusions of the anti-slip device of the hanging portion, which will be described later, come into contact with this inclined surface 11a and slide on the inclined surface 11a. In other words, the inclined surfaces 11a of the inclined portion 11 are provided to correspond to the lateral protrusions of the anti-slip device.

The inclined portion 11 is provided so that the inclined surface 11a is inclined toward the side opposite to the hook-hanging/unhanging side of the hook receiving portion 12. In other words, the hook is hung on the side opposite to the inclined portion 11, and is unhanged from the side opposite to the inclined portion 11.

Figure 4 is an enlarged front view of the suspension device near the suspension part, and Figure 5 is its side view.

The suspension part 20 of the suspension device is a hook or other member for suspending the suspension tool 10, and is provided with a hook 21 at the tip of the suspension device.

The hook 21 is equipped with a slip-prevention device 22. The slip-prevention device 22 prevents the hook 21 from slipping off when the hook 21 is hooked onto the hook receiving portion 12 of the sling 10, and functions as a slip-prevention device by extending vertically from the base of the hook 21 to close the opening of the hook 21. The slip-prevention device 22 is attached to the hook 21 by a member extending horizontally. This horizontally extending member and the upper end of the slip-prevention device 22 are rotatably connected. The slip-prevention device 22 is biased by a spring or the like so that it is perpendicular from the base of the hook 21 (the connection portion with the horizontally extending member) toward the needle tip in order to close the open portion of the hook 21.

The side of the anti-slip device 22 near its upper end is provided with a lateral protrusion 23 made of a rod-shaped member that protrudes horizontally outward on the left and right. The lateral protrusions 34 extending outward on the left and right sides have a length that allows them to abut the inclined surface 11a of the inclined portion 11 of the sling 10 in a corresponding shape to the left and right, respectively, and slide on the inclined surface 11a. In order to allow smooth sliding on the inclined surface 11a, the lateral protrusions 23 are preferably made of a cylindrical rod-shaped member or a rod-shaped member shaped such that the contact surface with the inclined surface 11a is parallel to the inclined surface 11a.

The hook hook 24 is also provided in the same manner as in conventional anti-detachment devices. In this embodiment, the hook hook 24 functions to restrict the rotation (opening) of the anti-detachment device 22, but can also be used as an emergency hook to hook in the event of an operational malfunction.

The procedure for removing the ball using a heavy load suspension device configured in this way will be explained using Figures 6 to 11.

In FIG. 6, the hook 21 is hooked on the hook receiving portion 12 of the sling 10. The anti-slip device 22 closes the opening of the hook 21, and the anti-slip function is being exerted. At this time, the lateral protrusion 23 is located at the upper end of the inclined surface 11a of the inclined portion 11.

When the hook 21 is hoisted by the crane's hoisting operation, as shown in FIG. 7, the lateral protrusion 23 slides downward along the inclined surface 11a from the upper end thereof, and the hook 21 begins to disengage downward from the hook receiving portion 12.

As the crane continues to hoist the load, and the side protrusion 23 slides downward along the inclined surface 11a, as shown in FIG. 8, the side protrusion 23 is pressed toward the inside of the hook 21 by the inclined surface 11a, causing the anti-slip device 22 to rotate and change the opening of the hook 21 from a closed state to an open state. The hand hook portion 24 then moves upward as if it is being lifted.

When the rope is wound up further, as shown in Figure 9, the anti-detachment device 22 opens completely, allowing the hook 21 to be removed from the hook receiving portion 12.

In this state, when the crane is operated to travel and the hook 21 is released from the hook receiving portion 12, the side protrusion 23 slides to the vicinity of the bottom end of the inclined surface 11a, as shown in Figure 10.

Then, as shown in FIG. 11, the hook 21 is released from the hook receiving portion 12, the release prevention device 22 returns to its original state (closed state), and the ball removal operation is completed.

The slinging work is performed in the opposite order to the above, and when the side protrusion 23 is brought into contact with the bottom end of the inclined surface 11a and slid upward, the force with which the side protrusion 23 is pressed inwardly of the hook 21 by the inclined surface 11a rotates the anti-detachment device 22 into an open state, and the hook 21 can be hung on the hook receiving portion 12. When the side protrusion 23 is slid further upwardly along the inclined surface 11a, the force with which the side protrusion 23 is pressed inwardly of the hook 21 by the inclined surface 11a weakens, and the anti-detachment device 22 rotates into a closed state due to the force of a spring or the like, thereby exerting its function of preventing the hook 21 from being removed from the hook receiving portion 12.

The heavy load hoisting device configured as described above has a hook receiving section for hooking the hook at the center of the hoist that suspends the load, and an inclined section that extends diagonally upwards. The hook side is provided with a rod-shaped lateral protrusion that protrudes horizontally outward to the left and right on the hook side of the hook prevention device. The lateral protrusion is brought into contact with the inclined surface of the inclined section by operating the crane, and the inclined surface is slid to open and close the hook prevention device to hang and remove the hook. This reduces the frequency with which the worker's hands are involved in the slinging and removal work, ensuring safety during the work.

In this way, the heavy load suspension device of the present invention makes it possible to attach and detach the hook during slinging and detaching work by operating the crane alone, eliminating the risk of the worker interfering with the hook or wire, and allowing the anti-detachment mechanism to be safely attached and detached during slinging and detaching.

The above describes the hanging device attachment/detachment mechanism in the heavy load suspension device according to the present invention based on the embodiment, but the present invention is not limited to this. Various design changes are possible as long as the object of the present invention can be achieved and do not deviate from the gist of the invention, and all of these are included within the scope of the present invention.

The lifting device attachment/detachment mechanism in the heavy load suspension device of the present invention is useful as a device for suspending heavy loads, such as a crane, and is particularly suitable for attaching and detaching the anti-detachment mechanism when slinging and removing the load.

REFERENCE SIGNS LIST 10 Lifting tool 11 Inclined portion 11a Inclined surface 12 Hook receiving portion 13 Load lifting portion 20 Lifting portion 21, 101 Hook 22, 102 Anti-dislodgement device 23 Side protrusion 24, 104 Hand hook portion 110 Wire rope 120 Hand hook

Claims (5)

A sling attachment/detachment mechanism for a sling device for a heavy load, comprising a hook and a hook winding means, the hook being provided with a locking device that extends vertically from a base of the hook to a needle tip of the hook and closes an opening of the hook,
The sling has a hook receiving portion to which a hook is attached at the center of the sling, which has a load slinging portion to which a heavy load is attached, and an inclined portion having an inclined surface that slopes obliquely upward from both the left and right ends of the hook receiving portion,
A rod-shaped lateral protrusion is provided to protrude horizontally outward from the lateral side of the hook prevention device,
A hoisting device attachment/detachment mechanism for a heavy load suspending device, characterized in that the hoisting means is operated to bring the side protrusions into contact with the inclined surface of the inclined portion and slide the inclined surface to open and close the hook anti-detachment device. The side protrusions are provided on both the left and right sides of the hook stopper device,
2. The hoisting device attaching/detaching mechanism for a hoisting device for a heavy load according to claim 1, wherein the inclined surfaces of the inclined portion are provided corresponding to the left and right side protrusions, respectively. 2. The mechanism for attaching and detaching a hoist in a suspension device for a heavy load according to claim 1, wherein the inclined surface of the inclined portion is inclined toward an opposite side to the side where the hook is attached and detached in the hook receiving portion. A sling for a heavy load suspension device, comprising a hook and a hoisting means for the hook, the hook being provided with a device for preventing the hook from coming off extending vertically from the base of the hook to the tip of the hook and closing an opening of the hook,
The sling includes a load sling portion to which a heavy load is attached, a hook receiving portion to which a hook is hooked at the center of the sling, and an inclined portion having an inclined surface that slopes obliquely upward from both left and right ends of the hook receiving portion,
A sling device characterized in that a rod-shaped lateral protrusion protruding horizontally outward from the side of the hook anti-slip device is brought into contact with the inclined surface of the inclined portion by operating the winding means, and slides on the inclined surface to open and close the hook anti-slip device. A hook for a heavy load suspension device, comprising a hook and a winding means for the hook, and a locking device for preventing the hook from coming off, the locking device extending vertically from the base of the hook to the tip of the hook and closing an opening of the hook,
The hook retaining device includes a rod-shaped lateral protrusion that protrudes horizontally outward from a side of the hook retaining device,
A hook for a heavy load suspension device, characterized in that, by operating the hoisting means, the side convex portion comes into contact with the inclined surface of a suspension device which includes a load suspension part to which a heavy load is attached, a hook receiving part to which a hook is hooked at the center of the suspension device, and an inclined portion having inclined surfaces that slope diagonally upward from both the left and right ends of the hook receiving part, and slides along the inclined surface to open and close the hook's anti-detachment device.

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