JPH0578091A - Hook device for suspending heavy object - Google Patents

Abstract

PURPOSE:To provide a hook device which can be preferably used for not only heavy objects but also light objects and allows improving safety at the site by composing the device of a plate-like hook supporting body, a hook having a back end part with a forked structure, a lock piece for the hook, and a falling prevention piece provided across the hook supporting body. CONSTITUTION:A hook device is composed of a plate-like hook supporting body 1, a hook 2 whose back end part 23 with a forked structure is disposed across the intermediate part 12 of the hook supporting body 1 in a manner that the hook 2 can be rotated, a lock piece 3 which cooperates with the hook supporting body 1 to lock and unlock the inverse rotation of the hook 2, and a falling prevention piece 4 having a back end part 42 with a forked structure. The back end part 42 with a forked structure cooperates with the back end part 23 of the hook to allow the hook opening 24 of the falling prevention piece 4 to be rotated inwardly while preventing the reverse rotation so that the falling prevention piece 4 is rotatively provided across the tip 11 of the hook supporting body 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hook device used for lifting heavy objects such as iron plates and blocks. More specifically, the present invention relates to a hook device that can reliably and easily hook a heavy object such as an iron plate or a block body and that is used for lifting a heavy object while eliminating the risk of dropping during lifting. It is a thing.

[0002]

2. Description of the Related Art Conventionally, iron plates have been used laid on the ground as a curing scaffold for soft ground at many construction sites. Depending on the type of work at this type of construction site, the iron plate must be constantly moved, and for that purpose, lifting work is performed using a crane or the like. That is, the above-described work of lifting and moving the iron plate as the scaffold is performed by forming a hole for lifting in a desired side surface of the iron plate, passing a wire or the like through the hole, and hooking this with a hook. Looking at the structure of the hook that is often used in the above-mentioned work, the hook is hung by a crane and carried to the vicinity of the iron plate, and the wire passed through the iron plate is hooked on the hook in the air. Due to the fact that it is used, the opening width between the hook and the fall prevention plate attached to the hook support for preventing fall and the hook is set to be extremely small. The structure of such a hook was originally devised to prevent danger.

However, in the field work, the work of hooking a wire on the laid iron plate is quite a heavy labor, and the hooking part (hook end part) of the hook is directly drilled in the iron plate. It is performed by inserting it into a hole and lifting it. In this case, since the opening width between the fall prevention plate and the hook is extremely small as described above, it is extremely difficult to hook the hook on the iron plate. That is, when an object laid on the ground such as an iron plate is hooked and hoisted, the fall prevention plate comes into contact with the ground because the opening width is extremely small during hooking, and it is difficult to hook it. Even if it is hooked, it will be difficult to remove the hook when detaching.

Therefore, originally, it is not possible to use a hook without a fall prevention device for this kind of work, but in many work sites there is no fall prevention device and the opening width is large. Currently, hooks are used. However, when a hook having a large opening width is used for this type of work without a fall prevention device, it is considerably dangerous. Looking at this point concretely, it rarely comes off when the iron plate is lifted with a hook without a fall prevention device, but when the iron plate is installed on the ground, the lifting wire and the hook for loosening due to looseness of the hanging wire etc. There are many cases where play occurs between the hooks and the hooks come off the lifting holes. Once the hook comes off the lifting hole, there is a risk that the steel plate may fall over, causing a person to become an underlay and a fatal accident. In reality, in this kind of work site, there are many fatal accidents due to the fall of the iron plate.

[0005]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention The present inventor has made earnest studies to solve the above-mentioned problems of the prior art.
As a result, the inventors of the present invention have unlocked and locked the hook device (the tip of the hook is a part of the hook support body) in the hook device including the hook support body and the hook rotatably arranged on the support body. It has an integral relationship with the fall prevention part
When it is possible to reversely rotate about 180 ° from the state where the lock state is maintained), that is, when the opening width of the hook and the dropout prevention portion is set to be extremely large compared to the conventional one, the ground surface is opened. It is easy to insert the tip of the hook into the hole for hooking heavy objects such as iron plates laid on the floor, and the fall prevention part may come into contact with the ground during detaching work. It was found that a hook device which is buried and does not become an obstacle, and which can be attached and detached extremely smoothly can be provided, and several proposals have been made earlier (Japanese Patent Application No. 3-53).
112, No. 3-216524).

More specifically, the hook device previously proposed by the present inventors comprises a hook support and a hook rotatably disposed on the support as described above, and when not in use. It is structured such that it is locked by a hook support and a lock piece arranged between the hooks, and the tip of the hook and a captive part forming a part of the hook support work together to close the hook opening. It was Therefore, during use, the lock piece must be operated to release the locked state between the hook support and the hook, and the hook opening is blocked by the cooperation of the tip of the hook and the drop-out prevention part that forms a part of the hook support. It had a structure in which the condition had to be released.

However, at the hoisting work site, not only heavy objects such as iron plates but also heavy objects as hoisting objects.
Since there are comparatively lightweight objects, the hook device proposed above is inconvenient to operate in order to deal with these. For example, when a relatively light lifting object is bound with a steel rope and the rope is hooked on the hook of the hook device of the above-mentioned structure to be lifted, the operation of the lock piece (unlock), the hook tip It is necessary to open the part and operate the lock piece after the rope is hooked on the hook (lock). The present invention is a hook device capable of safely hoisting and transporting not only a heavy object such as an iron plate but also a light object to be hoisted, a structure particularly suitable for hoisting a heavy object, and a hoisting operation of a light object. An object of the present invention is to provide a hook device having a suitable structure.

[0008]

The present invention will be summarized as follows.
The present invention relates to a hook device for lifting a heavy object, including (i) a plate-shaped hook support (1), and (ii) a rear end portion (23) of a bifurcated structure, and the rear end portion (23). ) Is rotatably mounted on the intermediate portion (12) of the hook support (1), and (iii) rotatably disposed in the forked space of the hook rear end portion (23). And in cooperation with the hook support (1), the hook (2)
Locking piece to lock or unlock the reverse rotation of (3)
, (Iv) Fall-out prevention piece (4) having a rear end portion (42) of the bifurcated structure
The rear end portion (42) cooperates with the hook rear end portion (23) to allow the fall prevention piece (4) to rotate inside the hook opening (24). A hook for lifting a heavy object, characterized in that the hook support body (1) comprises a fall prevention piece (4) rotatably mounted on the tip (11) of the hook support body (1) so as to restrict the outward rotation. It relates to the device.

The technical configuration of the present invention will be described in detail below with reference to the drawings. The present invention is not limited to the illustrated one.

FIG. 1 is a perspective view of a hook device (A) for lifting a heavy object of the present invention, and FIG. 2 is a front view in which a part of the hook device (A) is cut away. As shown, the hook device (A) of the present invention comprises four main components: a hook support (1), a hook (2), a locking piece (3), and a cap (4). It is a thing. Hereinafter, the hook device (A) of the present invention
The four main components that make up the above and their interrelationships will be described.

The hook support (1) has a single plate-like structure as shown in FIGS. 1 and 2, which has a tip portion (11),
It is divided into an intermediate portion (12) and a rear end portion (13).
As shown in FIG. 2, the middle part (12) of the hook support (1)
At, the rear end portions (23, 23 ') of the hook (2) are rotatably arranged. Further, the lower peripheral edge portion of the intermediate portion (12) is engaged with a tip convex portion (31) of a lock piece (3) which will be described later, and in the state of FIG. ) Is formed with a recess (121) for locking (stopping). Hook support
The tip portion (11) of (1) is a portion where the fall prevention piece (4) is arranged. A wire fixing portion (14) for fixing a wire rope connected to a winding mechanism such as a crane is formed at the rear end portion (13) of the hook support body (1).

As shown in FIG. 2, the hook (2) has a hook front end (21), a hook back (22), and a hook rear end (2).
The area of the hook rear end portion (23) is divided into the area 3) and has a bifurcated structure. In the present invention, the bifurcated space portion formed at the hook rear end portions (23, 23 ′) of the bifurcated structure has a size that accommodates the lock piece (3) described later, and any space in the bifurcated space portion. Not subject to restrictions. In the following description, since the hook rear end of the bifurcated structure has a symmetrical structure, only (23) is adopted as the graphic symbol of the hook rear end. In the present invention, the rear end portion (23) of the hook (2) having a bifurcated structure has the intermediate portion (12) of the hook support body (1) through the joint pin (5).
It is rotatably proud of. In the present invention, the shapes of the hook tip portion (21) and the hook back portion (22) are similar to those of a general hook, and may be any shapes suitable for hooking an object to be hung.

In the present invention, the characteristic structure of the hook (2) is the hook rear end (23). That is, the rear end of the hook
The reference numeral (23) has an arcuate peripheral edge portion (231), and a rear end portion (42) of a fall prevention piece (4) described later is brought into contact with the peripheral edge portion (231) by a spring biasing force. Further, a concave portion (232) is provided on the upper portion of the hook rear end portion (23) following the circular arc-shaped peripheral portion (231). The arcuate peripheral edge (2) of the hook rear end (23) described above.
31) and the concave portion (232) are the hook device of the present invention described later.
It has an important function as explained in the explanation of operation (A). That is, the hook support (1) and the hook of FIG.
When the lock (stop) state of (2) is unlocked by operating the lock piece (3) and the hook (2) is rotated in the upward direction in the opening / closing direction (b) in the figure, Arc-shaped peripheral part
The arcuate shape of (231) smoothly displaces the hook rear end (41) that abuts the peripheral edge (231) by the spring biasing force, and rotates the fall prevention piece (4) counterclockwise ( Counterclockwise rotation). And at maximum inversion,
That is, when the tip portion (13) (or the wire fixing portion (14)) of the hook support (1) and the hook back portion (22) are largely inverted so that they come into contact with each other, the recessed portion (232) is prevented from falling off. Rear end (4
It engages with 2) to invert the fall prevention piece (4) to the maximum, and prevents further rotation (counterclockwise rotation).

As shown in FIG. 2, the lock piece (3) is divided into a lock piece tip convex portion (31), an intermediate portion (32) and a rear end portion (33). The lock piece middle portion (32) is rotatably arranged in the forked space of the hook rear end portion (23) via the joint pin (6). At that time, the lock piece (3) is arranged so that the spring biasing force of the spring (61) causes the convex portion (31) of the lock piece tip to always be pressed against the lower peripheral edge of the hook support intermediate portion (12). To be done. The spring biasing by the spring (61) may be performed in a normal manner.
A spring (61) is wound around and one end is fixed to the wall surface in the forked space. The relative positional relationship between the hook support (1) and the hook (2) shown in FIG.
The protrusion (31) of the tip of the lock piece is engaged with the recess (121) formed in the lower peripheral edge of the hook support intermediate portion (12) by the spring biasing force, and the hook (2) is turned and turned ( This shows a state in which the upward rotation in the opening / closing direction (b) is locked (stopped). In order to facilitate the operation of the lock piece (3), the lock piece rear end (33) is provided with a hook rear end (23).
It is preferable to project it from the side surface to the outside to facilitate the manual operation.

As shown in FIGS. 1 and 2, the fall prevention piece (4) is divided into a region of the fall prevention piece front end (41) and a rear end portion (42) of the bifurcated structure. In the present invention, the rear end portion also includes a portion near the end portion. In the present invention,
The fall-preventing piece rear end portion (42) of the bifurcated structure is rotatably arranged on the tip end portion (11) of the hook support body (1) via a joining pin (7). At this time, the fall-prevention piece (4) is always pressed by the spring biasing force of the spring (71) so that the peripheral edge portion (421) of the rear end portion (42) always becomes the arcuate peripheral edge portion (231) of the hook rear end portion (23). It is arranged so as to abut. It should be noted that the spring urging by the spring (71) may be performed in a normal manner.
A spring (71) is wound around (7), one end of the spring (71) is on the hook support tip (11) side, and the other end is a fall prevention piece.
(4) The one fixed on the side is shown. In FIG. 2, the fall-preventing piece (4) has a tip portion (41) of the hook tip portion (21) due to the spring biasing force of the spring (71).
The position is such that the hook opening (24) is closed in cooperation with the position, and further outward rotation (counterclockwise rotation) is restricted. This is, as described above, the arc-shaped peripheral edge portion (231) of the hook rear end portion (23) and the rear end portion (42) of the fall prevention piece.
This is because the anti-clockwise rotation of the fall prevention piece (4) is prevented by the abutting relationship of. However, the fall prevention piece of the present invention
(4) is a rotation in the opening / closing direction (a) as shown in the drawing, that is, a rotation inward of the hook opening (24) (in the figure,
The state indicated by the dotted line) is permissible.

Therefore, the hook device (A) of the present invention can be used without operating the lock piece (3) in the state of FIG. 2 because of the structure of the above-mentioned fall prevention piece (4). .. That is, the object to be lifted is hooked in the state shown in FIG.
When attempting to carry, for example, a light lifting object bound with a steel rope to carry it,
While manually rotating the fall prevention piece (4) toward the hook back (22), the hook opening (24) is enlarged, and
Steel rope derived from the object to be hoisted (not shown)
Hook the end of the hook on the hook (2). After hooking, the fall prevention piece (4) is in its original state (closed state in FIG. 2) by the spring biasing force, that is, the tip of the fall prevention piece (4).
Since the positional relationship where the (41) and the tip end portion (21) of the hook come into contact with each other is restored, the object to be hoisted can be safely hoisted and transported. When the hooking opening (24) shown in FIG. 2 is closed, the rear end portion (42) of the fall prevention piece (4) contacts the arcuate peripheral edge portion (231) of the hook rear end portion (23). It touches and further movement is regulated. That is, the fall prevention piece (4) is allowed to rotate in the opening / closing direction (a) in the figure, but its movement is restricted at the position shown in FIG. 2 in the closed state. This is due to the contact relationship between the rear end portion (42) of the fall prevention piece and the rear end portion (23) of the hook as described above. If the object to be hoisted is a heavy object such as an iron plate and has a hook hole formed in the heavy object, operate the lock piece (3) to move the hook support shown in FIG. The relative positional relationship between the body (1) and the hook (2) may be used by largely reversing and rotating upward in the opening / closing direction (b).

The operation of the hook device (A) of the present invention will be described below with reference to the drawings. The following hook devices
The operation description in (A) is based on the case where the object to be hoisted is a heavy object such as an iron plate having a hole for exclusive use for hooking.

In the case of a heavy object such as an iron plate which has a hole for hooking the hook device in the object to be hoisted, the fall prevention piece (4) and the hook (2) are closed. When the hook is released, the hook opening (24) is opened to the maximum, and the hook (2) is attached to a heavy hole such as an iron plate to prevent the fall prevention piece (4) from getting in the way. Must be something that can be hooked to.
It goes without saying that the hook device (A) of the present invention can answer the above-mentioned request. FIG. 3 is a depression formed in the peripheral portion of the lock piece tip projection (31) and the hook support intermediate portion (12) by pushing down the lock piece (3) shown in FIG. 2 by a manual operation. It shows a state in which the engagement of (121) is released and the hook support (1) and the hook (2) are slightly displaced upward in the opening / closing direction (b). At this time,
The rear end portion (42) of the drop-out prevention piece (4) is displaced by being biased by a spring while contacting the arcuate peripheral edge portion (231) of the hook rear end portion (23).

In FIG. 4, the relative positional relationship between the hook support (1) and the hook (2) is further displaced upward in the opening / closing direction (b) from the state of FIG. 3 so that the hook (2) of FIG. It shows the state when it is reversed to the maximum position (at the time of maximum inversion). At the maximum reversal, the hook (2) and the cap (4) have the following mutual relationship. That is, the rear end portion (42) of the fall prevention piece (4) is displaced while coming into contact with the arcuate peripheral edge portion (231) of the hook rear end portion (23) to reach the concave portion (232), and the concave portion (232). To fit. This fitting secures the maximum displacement amount of the fall prevention piece (4) and restricts further rotation. If the cap (4) has a cam shape (eccentric shape) as shown in the figure, when it is fitted into the recess (232), the cap (4) will rotate largely outward due to the spring biasing force. Then, the opening width of the hook can be maximized.

FIG. 5 shows the hook support (1) shown in FIG.
It is a figure explaining the usage mode of the hook device (A) of the present invention in the maximum reversal state of the hook (2) to. That is,
An iron plate laid on the ground (E) such as soft ground at a construction site
The state of (I) when being lifted by the hook device (A) of the present invention will be described. Figure 5 shows the hook support (1)
Since the fall-prevention piece (4) arranged on the ground does not touch the ground (E), the hole (H) for exclusive use in hooking drilled in the iron plate (I) and the ground
It shows that the tip (21) of the hook (2) can be inserted very easily into (E). When the iron plate (I) is gradually lifted by a crane from the state shown in Fig. 5, the hook
(2) is displaced in the direction opposite to that of Fig. 2 → Fig. 4 so that it becomes a closed state. At this time, the fall prevention piece (4) also automatically returns to the closed state shown in FIG. When the closed state of FIG. 2 is completed during lifting, the iron plate (I) can be transported to the desired destination completely safely thereafter. To remove the hook device (A) from the iron plate (I), the hook device (A) can be easily removed by returning to the state shown in FIG.

[0021]

In the hook device according to the present invention, in which the fall-preventing piece and the hook are rotatably arranged on the hook support, the opening width of the hook tip portion can be made larger than that of the prior art. It can be hooked very easily and surely into the hole (hooking port) provided in the heavy structure, and the hook tip and the drop-out prevention piece are locked together during the lifting and transporting. The object does not come off the hook, and the hook can be attached / detached very easily because the opening width of the fall prevention piece and the tip of the hook is large. Further, in the hook device of the present invention, when the fall prevention piece cooperates with the hook tip and closes the hook opening, its rotation is restricted so as to maintain the closed state. Since it is allowed to rotate to, it can be suitably used not only for the above-mentioned heavy object but also for a light object, which is an object of an ordinary hook device. In this case, it is sufficient to displace the fall-prevention piece toward the back side of the hook in the hook opening, hook the object to be lifted, and return the fall-prevention piece to its original position. As described above, the hook position of the present invention can prevent the falling of the object to be lifted due to the disengagement of the hook, a fall accident, etc. in the lifting work of various objects as well as the heavy structure, and therefore the safety of the field work. Since it is possible to improve the property, its significance is great.

[Brief description of drawings]

FIG. 1 is a perspective view of a hook device of the present invention.

2 is a partially cutaway front view of the hook device shown in FIG. 1 of the present invention. FIG.

FIG. 3 is an operation explanatory view of the hook device of the present invention, showing a state immediately after unlocking the lock piece from the hook support body.

FIG. 4 is an operation explanatory view of the hook device of the present invention, and shows a state when the hook is maximally reversed.

FIG. 5 is a diagram illustrating a usage mode of the hook device of the present invention, showing a state in which an iron plate laid on the ground is lifted when the hook is turned upside down.

[Explanation of symbols]

 A …………………… Hook device 1 …………………… Hook support 2 …………………… Hook 3 ………………… Lock piece 4 ………………… Piece 5,6,7 ………… Joining pin 61,71 ……………… Spring body a, b ………… Opening / closing direction I …………………… Steel plate H ……………… For lifting Hole E …………………… Ground

Claims (11)

[Claims] 1. A hook device for lifting a heavy object, comprising: (i) a plate-shaped hook support member (1); and (ii) a rear end portion (23) of a bifurcated structure. A hook (2) rotatably mounted on the intermediate portion (12) of the hook support (1), and (iii) rotatably arranged in the forked space of the hook rear end portion (23). A locking piece (3) for locking or unlocking the reverse rotation of the hook (2) in cooperation with the hook support (1), and (iv) the rear end (42) of the bifurcated structure. The fall prevention piece (4) having the rear end portion (42) working in cooperation with the hook rear end portion (23) to the inside of the hook opening (24) of the fall prevention piece (4). A fall prevention piece that is rotatably mounted on the tip (11) of the hook support (1) so that it can rotate but restricts outward rotation.
(4) A hook device for lifting heavy objects, characterized by comprising: 2. The plate-shaped hook support (1) has an intermediate portion.
The recess (121) for maintaining the locked state of the hook (2) when the hook (2) is not inverted by engaging with the tip projection (31) of the lock piece (3) in the (12). Hook device for lifting heavy objects. 3. The bifurcated hook rear end portion (23) is arranged on the hook support body (1) via a joining pin (5) at an intermediate portion (12) of the hook support body (1). The hook device for lifting heavy objects according to claim 1, which is a thing. 4. The bifurcated hook rear end (23) has an arcuate peripheral edge (231), and engages with the rear end (42) of the fall prevention piece when the hook (2) is maximally inverted. The hook device for lifting heavy objects according to claim 1, wherein the hook device has a recess (232). 5. The intermediate portion (32) of the lock piece (3) is pivoted in the forked space of the rear end portion of the hook and below the intermediate portion (12) of the hook support body via a joining pin (6). The hook device for lifting a heavy object according to claim 1, which is arranged freely. 6. A hook support body, in which a tip projection (31) of a lock piece (3) is wound by a spring body (61) wound around a joint pin (6).
The hook device for lifting a heavy object according to claim 5, wherein the hook device is pressed against the peripheral portion of (1). 7. The rear end (33) of the locking piece (3) projects from the rear end (23) of the hook, and when the hook (2) is maximally reversed, the rear end (23) and the hook support (1). The hook device for lifting a heavy object according to claim 1, which is sandwiched between the two. 8. The drop-preventing piece (4) is arranged on the hook support (1) via a joining pin (7) at the tip (11) of the hook support (1). Item 2. A hook device for lifting a heavy object according to Item 1. 9. The rear end portion (42) of the fall-out preventing piece (4) is hooked by the spring body (71) wound around the joint pin (7).
The hook device for lifting heavy objects according to claim 8, which is pressed against the hook. 10. The tip end portion (41) of the fall prevention piece (4) is attached to a hook tip end portion (2) by a spring body (71) wound around a joint pin (7).
The hook device for lifting a heavy object according to claim 8, which is pressed against the opening (24) to close the hook opening (24). 11. The fall-preventing piece (4) is capable of turning and returning inward of the hook opening (24) by a spring body (71) wound around a joint pin (7). Item 9. A hook device for lifting heavy objects according to Item 8.