JP2813680B2 - Hook device for lifting heavy objects - Google Patents

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 particularly, 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, and is used for lifting a heavy object while eliminating the danger of dropping during lifting. Things.

[0002]

2. Description of the Related Art Conventionally, iron plates have been used on a lot of construction sites as a scaffold for curing soft ground. Depending on the type of work performed at a construction site of this type, the iron plate must be constantly moved, and for that purpose, a lifting operation is performed using a crane or the like. That is, the work of lifting and moving the iron plate as the scaffold is performed by forming a hole for lifting on a desired side surface of the iron plate, passing a wire or the like through the hole, and hooking the wire with a hook.
Then, looking at the structure of the hook frequently used in the above-mentioned work, the hook is suspended by a crane or the like and carried to a position near the iron plate, and the wire passed through the iron plate is hooked on the hook in the air. Due to the use, the opening width between the hook and the fall prevention plate attached to the hook or hook support for preventing the fall is set to be extremely small. Such a structure of the hook was originally devised for danger prevention.

However, in the field work, the work itself of hooking the wire on the laid iron plate is quite a heavy labor, and the hook hook portion (hook tip) is directly drilled in the iron plate. It is inserted into a hole and lifted. In this case, as described above, since the opening width between the fall prevention plate and the hook is extremely small, it is extremely difficult to hook the hook on the iron plate. That is, when hanging an object laid on the ground like an iron plate and lifting it, the fall prevention plate abuts on the ground because the opening width is extremely small at the time of hanging, and it is difficult to hook. Even if hooked, it is difficult to remove the hook when attaching and detaching.

For this reason, a hook without a fall prevention device cannot be used for this kind of work. However, many work sites do not have a fall prevention device and have a large opening width. At present, hooks are used. However, if a hook having a large opening width is used without a fall prevention device for this kind of work, it is quite dangerous. Looking concretely at this point, when the iron plate is lifted by the hook without the fall prevention device, it hardly comes off, but when installing the iron plate on the ground, the lifting holes and hooks are loose due to the slack of the hanging wire etc. In some cases, play occurs between the hooks and the hooks come off the lifting holes. Once the hook is removed from the hole for lifting, it may lead to an accident of falling down of the iron plate, and there is a danger that a person may be laid down and a fatal accident may occur. Actually, at this kind of work site, there are many fatal accidents due to the fall of the steel plate.

[0005]

The inventor of the present invention has made intensive studies to solve the above-mentioned problems of the prior art.
As a result, the present inventors have found that in a hook device including a hook support and a hook rotatably disposed on the support, the hook is unlocked and locked (the tip end of the hook is part of the hook support). Is integrated with the fall prevention part
When the rotation can be reversed by about 180 ° from the state where the locked state is maintained, that is, when the opening width between the hook and the drop-out preventing portion is made to be much larger than the conventional one, When hooking a heavy object such as an iron plate, the tip of the hook can be easily inserted into the hole for hooking the heavy object. It has been found that the hook device can be very smoothly attached and detached without being buried or becoming an obstacle, and several proposals have been made earlier (Japanese Patent Application No. 3-53).
112, 3-216524).

More specifically, the hook device proposed earlier by the present inventors comprises a hook support and a hook rotatably disposed on the support as described above. The hook is locked by a lock piece disposed between the hook support and the hook, and the tip end of the hook and a drop-off preventing portion forming a part of the hook support cooperate to close the hook opening. Was. Therefore, in use, always operate the lock piece to release the locked state of the hook support and the hook, and close the hook opening by the cooperation of the tip of the hook and the drop-off prevention part that forms part of the hook support. The structure had to be released.

However, at the lifting work site, not only heavy objects such as iron plates,
Since there are relatively light objects, the hook device proposed above is inconvenient to operate in order to cope with these objects. For example, when a relatively lightweight object to be lifted is tied with a steel rope and the rope is to be hooked on the hook of the hook device having the above-described structure, the lock piece is operated (unlocked), and the hook tip is used. It is necessary to perform a procedure of opening the part and operating (locking) the lock piece after the rope is hooked on the hook part. The present invention relates to a hook device capable of safely lifting and conveying even a light object as well as a heavy object such as an iron plate, especially a structure suitable for lifting a heavy object, and a lifting apparatus for a light object. An object of the present invention is to provide a hook device having a suitable structure. Furthermore,
In the prior art, a lock member separate from the falling-off prevention member was essential for locking and unlocking the hook portion, but the present invention eliminates the use of the locking member and replaces the locking prevention member with the locking member. It is intended to provide a new and economical hook device with a function.

[0008]

SUMMARY OF THE INVENTION In summary of the present invention,
The present invention relates to a hook device for lifting a heavy object, comprising: (i) a hook (2) having a hook support (1), (ii) a hook rear end (23), (23) is the locking piece (3) when the hook (2) and the hook support (1) are locked.
A first locking portion (231) for locking the rear end (32) of the rear end (3).
An arc-shaped peripheral portion (232) for rotating and guiding the 2), and a hook (2)
The second locking portion (23) that locks the rear end (32) when the
3) wherein the hook rear end (23) is rotatably arranged at the intermediate portion (12) of the hook support (1), and the hooks (2) and (iii) prevent falling off. A drop-off prevention piece (3) having one rear end (32), the rear end (32) being rotatable about the front end (11) of the hook support (1), and End (32)
The present invention relates to a hook device for lifting heavy objects, characterized in that it comprises a falling-off prevention piece (3) disposed by being pressed against a hook rear end (23) by an elastic force.

Hereinafter, the technical configuration of the present invention will be described in detail with reference to the drawings. Note that 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 according to a first embodiment of the present invention, and FIG. 2 is a front view of the hook device (A) with a part cut away. . As shown, the hook device (A) of the present invention comprises a hook support (1).
, Hooks (2), and fall-off prevention pieces (3). In the present invention, the use of the lock member, which is an essential component in this type of hook device, is eliminated, and the locking function is provided in the falling-off preventing piece (3) as described later. Hereinafter, the three main components constituting the hook device (A) of the present invention and their interrelation will be described.

In the first embodiment of the present invention, the hook support (1) has a single plate-like structure as shown in FIGS. 1 and 2, which comprises a tip portion (11) and an intermediate portion ( 12) and the area of the rear end (13). As shown in FIG.
A rear end (23) of the hook (2) is rotatably disposed at an intermediate portion (12) of the hook support (1) via a joining pin (4). The tip (11) of the hook support (1) is a drop-off prevention piece (3)
This is the part where is disposed. At the rear end (13) of the hook support (1), a wire fixing portion (14) for fixing a wire rope connected to a winding mechanism such as a crane is formed.

As shown in FIG. 2, the hook (2) has a hook tip (21), a hook back (22), and a hook rear end (2).
The hook is divided into three areas, and the area of the hook rear end (23) has a forked structure. In the present invention, the forked space portion formed at the hook rear end portion (23, 23 ') of the forked structure has any size in the space space as long as it can accommodate the hook support intermediate portion (12). Is not restricted. In the following description, the hook rear end of the bifurcated structure has a symmetric structure,
Only (23) is used as a symbol at the rear end of the hook. In the present invention, the rear end (23) of the hook (2) having a forked structure is
The intermediate portion (1) of the hook support (1) is connected via the connecting pin (4).
2) It is made to be rotatable. In the present invention, the shape of the hook tip (21) and the hook back (22) is the same as that of a general hook, and may be a shape suitable for hooking the object to be lifted (hook).

In the present invention, the characteristic structure of the hook (2) is at the hook rear end (23). Hook device of the present invention
(A) eliminates the lock member as an independent and separate member which is indispensable in the prior art as described above, and hooks the lock mechanism (lock and unlock) (2).
The structure of the hook (2) and the falling-off prevention piece (3) is a major feature in order to achieve the goal under the cooperation of the two members.

For this reason, the structure of the hook (2) of the present invention, particularly the structure of the rear end (23), is as follows. (A) The rear end portion (23) of the hook is provided with a drop-off preventing piece (3) so that the hook (2) securely maintains the locked state shown in FIG.
It must have a first locking portion (231) for securely engaging the rear end portion (32). The first locking portion (23
1) and the fall prevention piece rear end (32) can be reliably engaged by pressing the fall prevention piece rear end (32) against the hook rear end (23) by the spring bias as described later. Achieved. (B) After releasing the lock, that is, after releasing the engagement between the first locking portion (231) and the rear end portion (32) of the drop-off prevention piece,
When the hook opening width is increased by turning the (2) upward and backward in the opening and closing direction (b) as shown, the rear end (32) is smoothly displaced and falls off in conjunction with the inversion of the hook. In order to prevent the prevention piece (3) from rotating counterclockwise, it is preferable that the hook rear end (23) is an arc-shaped peripheral edge (232). (C) When the lock (2) is fully inverted, that is, when the tip of the hook support (or the wire fixing portion (14)) and the hook back (22) are largely inverted so that they come into contact with each other, It is preferable to provide a second locking portion (233) for engaging and fixing the end portion (32) and for opening the drop-off preventing piece (3) greatly at the time of engagement. That is, at the position where the contact with the arc-shaped peripheral portion (232) ends,
When the (32) is engaged with the second locking portion (233), it is preferable that the spring (32) be largely turned outward (counterclockwise) by the spring biasing force (however, the end position of the inverted rotation). Is shown in FIG. 4), whereby the opening width can be made larger.

As shown in FIGS. 1 and 2, the fall-off prevention piece (3) is divided into a region of a tip end (31) of the fall-off prevention piece and a rear end (32) of a forked structure. In the present invention, the rear end includes a part near the end. In the present invention,
The rear end portion (32) of the fall-preventing piece of the forked structure is rotatably disposed on the front end portion (11) of the hook support (1) via a joining pin (5). At this time, the falling-off prevention piece (3) has the rear end (32) of the peripheral edge (421) always contacting the arc-shaped peripheral edge (231) of the hook rear end (23) by the spring biasing force of the spring (51). It is arranged to be in contact. The biasing of the spring by the spring (51) may be performed in a usual manner, and FIG.
A spring (51) is wound around (5), one end of the spring (71) is on the hook support tip (11) side, and the other end is a drop-off prevention piece.
(3) The embodiment fixed to the side is shown. In FIG. 2, the falling-off prevention piece (3) has its tip (31) at the hook tip (21) by the spring biasing force of the spring (51).
It takes a position to close the hook opening (24) in cooperation with, indicating that further outward rotation (counterclockwise rotation) is restricted. As described above, this is caused by the contact between the first locking portion (231) of the hook rear end (23) and the rear end (32) of the fall-prevention piece, and the counter-clockwise rotation of the fall-prevention piece (3). This is to prevent rotation. However, the drop-off prevention piece of the present invention
(3) is a rotation in the opening / closing direction (a) as shown in the figure, that is, a rotation inward of the hook opening (24) (in the figure,
(The state shown by the dotted line) is permitted.

Therefore, the hook device (A) of the present invention has the above-mentioned structure of the fall-preventing piece (4). When the fall-preventing piece (3) is operated (clockwise) in the state of FIG. The first locking part of the rear end (32) of the drop-off prevention piece (3) and the hook rear end (23)
The engagement (locked state) of (231) is simultaneously released. That is, when the object to be lifted is to be hooked in the state of FIG. 2, for example, when a lightweight object to be lifted tied with a steel rope is to be lifted and moved, ) In the direction of the hook back (22) so that the end of a steel rope (not shown) derived from the object to be lifted is hooked on the hook (2) at the hook opening (24). . After the hooking, the falling-off preventing piece (3) is in its original state (closed state in FIG. 2) by the urging force of the spring, that is, the falling-off preventing piece (3).
The tip of the hook (31) and the hook tip (21) come back into contact with each other, and the rear end (32) of the drop-off prevention piece (3) and the hook rear end (2)
The first locking portion (231) of (3) is engaged, the stable locked state is maintained, and the object to be lifted can be lifted and transported safely. When the drop-off prevention piece (3) closes the hook opening (24) shown in FIG. 2, its rear end (32) abuts on the arc-shaped peripheral portion (232) of the hook rear end (23). Contact, further movement is regulated. That is, the falling-off prevention piece (3) is allowed to rotate in the opening / closing direction (a) in the drawing, but in the closed state, the movement is restricted at the position shown in FIG. This is because, as described above, the drop-off prevention piece rear end (32) and the hook rear end (23)
This is due to the contact relationship. In addition, when the object to be lifted is a heavy object such as an iron plate and has a hole for hooking formed in the heavy object, the falling-off prevention piece (3) is rotated in the direction of the hook back (22). The rear end (3
2) is disengaged from the first locking portion (231) of the hook rear end (23), and then the hook support (1) and the hook shown in FIG.
For example, the hook support (1) is turned counterclockwise so as to take the relative positional relationship of (2), and finally turned upside down as shown in FIG. I just need.

The operation of the hook device (A) of the present invention will be described below with reference to the drawings. The following hook device
The description of the operation in (A) is an example in which the object to be lifted is a heavy object such as an iron plate provided with a hole dedicated to hooking.

In the case of a heavy object such as an iron plate having a high risk in which a hole dedicated to hooking on a hook device is drilled, the falling-off preventing piece (3) and the hook (2) are closed. When the hook is released, the opening (24) of the hook is opened to the maximum, and the hook (2) is hooked into a hole dedicated to a heavy object such as an iron plate so that the dropout prevention piece (3) does not interfere. Must be able to be hooked.
Needless to say, the hook device (A) of the present invention can respond to the above request. FIG. 3 shows a state in which the fall prevention piece (3) is rotated at a position indicated by a dotted line in FIG. 2 so that the first locking portion (231) of the hook rear end (23) and the fall prevention rear end (32) are connected. Is disengaged, 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 (32) of the fall prevention piece (3)
By the bias of the spring, the arc-shaped peripheral edge (23) of the hook rear end (23)
2) Displaces while contacting.

FIG. 4 shows that the relative positional relationship between the hook support (1) and the hook (2) is greatly displaced upward in the opening / closing direction (b) from the state shown in FIG. It shows a state when the position is inverted to the maximum position (at the time of maximum inversion). At the time of this maximum reversal, the hook (2) and the falling-off prevention piece (3) have the following correlation. That is, the rear end portion (32) of the drop prevention piece (3) is displaced while abutting on the arc-shaped peripheral edge portion (231) of the hook rear end portion (23) to reach the second locking concave portion (233). Fits in recess (233). By this fitting, the maximum amount of displacement of the falling-off preventing piece (4) is secured, and further rotation is restricted. If the fall-prevention piece (3) has a cam shape (eccentric shape) as shown in the figure, the spring-preventing piece will cause the fall-prevention piece (3) to be turned outward greatly when fitted into the recess (233). It can be moved open to maximize the opening width of the hook.

FIG. 5 shows the hook support (1) shown in FIG.
FIG. 4 is a view for explaining a use mode of the hook device (A) of the present invention when the hook (2) is in the maximum inverted state with respect to FIG. That is,
Iron plate laid on the ground (E) such as soft ground at a construction site
(I) illustrates a state in which the hook device (A) of the present invention is lifted. FIG. 5 shows a hook support (1).
The fall prevention piece (3) arranged on the steel plate (3) does not hit the ground (E), so the hook hole (H)
(E) shows that the tip (21) of the hook (2) can be inserted very easily. When the iron plate (I) is gradually lifted from the state shown in FIG.
(2) is displaced in the direction opposite to that of FIG. At this time, the falling-off prevention piece (4) also automatically returns to the closed state in FIG. When the closed state shown in FIG. 2 is completed at the time of lifting, the iron plate (I) can be transported to a desired destination quite safely thereafter. The hook device (A) can be easily removed from the iron plate (I) by returning to the state shown in FIG.

FIG. 6 is a perspective view of a hook device (A) for lifting heavy objects according to a second embodiment of the present invention. FIG. 7 shows FIG.
Hook device for lifting heavy objects of the second embodiment shown in (A)
The main part of the hook, that is, the rear end of the hook (23) and the rear end of the fall prevention piece (32)
FIG. The thing of the 2nd example shown in Drawings 6-7 is compared with the above-mentioned 1st example,
(B) the hook support (1) has a forked structure;
(B) The rear end of the hook (23) and the rear end (32) of the drop-preventing piece have a single-plate structure. (C) The spring biasing force is such that one end of the spring body (51) is 6) is substantially the same as that of the first embodiment, except that it is engaged with

[0022]

According to the hook device of the present invention, in which the hook-preventing piece and the hook are rotatably arranged on the hook support, the opening width of the hook tip can be made larger than before, so that the hook is made of an iron plate or the like. It can be hooked very easily and securely to the hole (hook) provided in the heavy-weight structure, and the hook tip and the drop-off prevention piece are integrally locked during lifting and transporting and during attachment / detachment. Therefore, the heavy structure does not come off the hook, and the hook can be attached and detached very easily because the opening width of the drop-off preventing piece and the hook tip is large. Further, in the hook device of the present invention, when the drop-off preventing piece closes the hook opening in cooperation with the hook tip, its rotation is regulated so as to maintain the closed state. Since the rotation of the hook device is permitted, it can be suitably used not only for the heavy object described above but also for a light object, for example, which is a target of a normal hook device. In this case, the fall prevention piece is displaced to the hook back side in the hook opening,
The object to be lifted may be hooked and the fall-preventing piece may be returned to the original position, and the object to be lifted can be safely lifted and conveyed. In the lifting work of the object of
Since the object to be lifted can be prevented from dropping or falling over due to the detachment of the hook, the safety of on-site work can be improved, which is significant.

[Brief description of the drawings]

FIG. 1 is a perspective view of a hook device according to a first embodiment of the present invention.

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

FIG. 3 is an explanatory view of the operation of the hook device of the present invention, which shows a state immediately after the lock is released by releasing the engagement between the rear end of the hook and the rear end of the drop prevention piece.

FIG. 4 is an explanatory view of the operation of the hook device of the present invention, showing a state in which the hook is fully inverted.

FIG. 5 is a view for explaining a use mode of the hook device of the present invention, and shows a state in which an iron plate laid on the ground is lifted when the hook is turned upside down.

FIG. 6 is a perspective view of a hook device according to a second embodiment of the present invention.

FIG. 7 is an enlarged front view of a second embodiment of the present invention in which a part of a main part is cut away.

[Explanation of symbols]

 A: Hook device 1: Hook support 2: Hook 23: Hook rear end 231: First hook Stop portion 232 Arc-shaped peripheral edge portion 232 Second locking portion 3 Fall-off prevention piece 4, 5 Joint pin 51 … Spring body a, b ……… Opening and closing direction I …………… Iron plate H …………………………………………………………………………………………………………………………… E

Claims (9)

(57) [Claims] 1. A hook device for lifting a heavy object, comprising: (i) a hook support (1); (ii) a hook (2) having a hook rear end portion (23); The first part (23) locks the rear end (32) of the drop-off prevention piece (3) when the hook (2) and the hook support (1) are locked.
The locking portion (231), the arc-shaped peripheral portion (232) for rotatably guiding the rear end (32), and the rear end (32) when the hook (2) is maximally inverted.
A second locking portion (233) for locking the hook, and the hook rear end (23) is provided at an intermediate portion (1) of the hook support (1).
A hook (2) rotatably disposed in (2), (iii) a fall-off prevention piece (3) having a fall-off prevention piece rear end (32), wherein the rear end (32) is A drop-off prevention piece disposed rotatably on the tip end (11) of the hook support (1), and the rear end (32) being pressed against the hook rear end (23) by elastic force.
(3) A hook device for lifting heavy objects, comprising: 2. The hook device according to claim 1, wherein the hook support has a single-plate structure or a forked structure. 3. When the hook support (1) has a single-plate structure, the rear end (23) of the hook (2) and the rear end (32) of the drop-off preventing piece (3) have a forked structure. The hook device for lifting heavy objects according to claim 2, wherein 4. When the hook support (1) has a bifurcated structure, the rear end (23) of the hook (2) and the rear end (32) of the drop-off preventing piece (3) have a single-plate structure. The hook device for lifting heavy objects according to claim 2, which is: 5. The heavy object according to claim 1, wherein the hook rear end portion (23) is rotatably disposed on the hook support intermediate portion (12) via the connecting pin (4). Lifting hook device. 6. A rear end portion (32) of the fall prevention piece is provided with a joining pin (5).
The hook device for lifting a heavy object according to claim 1, wherein the hook device is rotatably disposed at a tip end portion (11) of the hook support member via a hook. The rear end portion (32) of the fall prevention piece is provided with a joining pin (5).
The hook device for lifting a heavy object according to claim 6, wherein said hook device is pressed into engagement with a hook rear end portion (23) by a spring body (51) wound around said hook member. 8. The tip (31) of the falling-off prevention piece (3) is fixed to a hook tip (21) by a spring body (51) wound around the joining pin (5).
7. A hook device for lifting a heavy object according to claim 6, wherein the hook opening is closed by being pressed against the hook. 9. The drop-off preventing piece (3) can be turned and returned inward of the hook opening (24) by a spring body (51) wound around the joining pin (5). Item 7. A hook device for lifting heavy objects according to item 6.