JP2001199673A - Heavy object lifting hook - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heavy object lifting hook securing safety and efficiency in work. SOLUTION: In this hook, a hook support body 1 having a two-stage structure is disposed with a pin C at a middle portion between connection pins A, B. The pin C restricts a position of a hook part 3 in a lifting state with the pin C abutted on a rear part 31a of the hook part 3 turned counterclockwise, restricts a final position of the hook part 3 in a lifting down state with the pin C abutted on the rear part 31a of the hook part 3 turned clockwise, restricts a closing position of a detachment prevention part 4 to an opening 3a when the hook part 3 is in the lifting state with the pin C abutted on a rear part 41 of the detachment prevention part 4 energized counterclockwise, and restricts a final position of the detachment prevention part 4 in a clockwise turn of the detachment prevention part 4 from the closing position.

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 can securely and easily hook a heavy object such as an iron plate or a block body, and completely eliminates the danger of a heavy object falling from the hook portion during lifting, and completely removes the hook portion. TECHNICAL FIELD The present invention relates to a hook device for lifting a heavy object, which facilitates removal of the heavy object from the hook.

[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. In addition, this type of iron plate is called a sheet iron plate. Depending on the type of work performed at this type of construction site, the iron sheet must be constantly moved, and for that purpose, lifting work is frequently performed using a claim or the like. That is, in the above-described work of lifting and moving the iron sheet as a scaffold at the construction site, a hole for lifting is previously drilled on a desired side surface of the iron sheet, and an operator (operator) can open the hole in this hole. This is done by passing it through a wire or the like and hooking it on a hook.

[0003] Looking at the structure of a hook device frequently used in the above-described lifting and hanging (hanging) work,
The hook is suspended by a crane or the like and transported to the vicinity of the iron sheet, and the wire passed through the iron sheet is used to hook the hook in the air. There is a structure in which an opening width between a fall prevention plate and a hook attached to prevent the fall is set to be extremely small. The hook device provided with such a fall-off / fall-prevention plate is originally devised for danger prevention.

[0004] However, in the field work, the work of hooking the wire on the laid iron plate of several tons laid is quite a heavy labor, and the hook hook portion (hook tip portion) is directly attached to the wire. 2. Description of the Related Art It has been practiced to insert a lift into a lifting hole drilled at a predetermined position on an iron sheet and lift it. In this case, as described above, since the opening width between the fall prevention plate and the hook is extremely small, the operation itself of hooking the hook on the hook iron plate is extremely difficult. In other words, when a heavy object laid on the ground such as an iron plate is hooked and lifted by a hook, the opening width of the hook is set to be extremely small at the time of hooking, so that the fall prevention plate is attached to the ground during the hooking operation. As a result, the tip of the hook cannot be hooked on the iron sheet, and even if the hook is hooked, it is difficult to transport the iron sheet to a predetermined position, lay it, and then remove the hook from the iron sheet.

For this reason, a hook without a fall prevention device cannot be used for this type 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, when using a hook with a large opening width without a fall prevention device for this type of work,
It goes without saying that it is quite dangerous.

When this point is concretely examined, when the iron sheet is lifted by the hook without the fall-off prevention device, the iron sheet hardly comes off from the hook portion due to the weight of the iron sheet, but the iron sheet is placed on the ground. When laying, looseness of the hanging wire causes play between the lifting hole and the hook, and the hook often comes off the lifting hole. Once the hook is removed from the lifting hole, it could lead to several tons of steel plate falling accidents, which could lead to people being laid down and causing death. Actually, there are many deaths and serious injuries caused by falling down of the iron plate in this kind of work site.

[0007]

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, in a hook device comprising a hook support portion and a hook portion rotatably disposed on the hook support portion, in a locked state of both (the tip of the hook portion is hooked) (A state in which the lock state is maintained in an integrated relationship with the tip of the drop-off prevention part that forms part of the support.)
Is released, and the hook portion is approximately 180 degrees with respect to the hook support portion.
°, when it is made to be able to rotate in reverse, that is, when the opening width of the hook portion and the dropout prevention portion is made to be extremely large compared to the conventional case, the weight of a heavy iron sheet or the like laid on the ground At the time of hooking work, the tip of the hook part can be easily inserted into the hole for hooking the heavy object, and at the time of detaching work, the detachment prevention part comes into contact with the ground or buried in the ground and detaches (removes) work It has been found that a hook device in which the hook portion can be attached and detached from the object to be lifted very smoothly can be obtained without hindrance, and several proposals have been made earlier (Japanese Patent No. 283).
3671, Japanese Patent No. 2,833,674).

More specifically, the hook device proposed earlier by the present inventors has a hook support portion integrally formed with a drop-off preventing portion as described above, and a pivotal movement of the hook support portion. The hook portion is freely arranged, and when not in use, is locked by a lock member, which is a third member provided between the hook support portion and the hook portion. The structure has a structure in which the drop-off preventing portions forming part of the body cooperate to close the opening of the hook portion. Therefore, in use, the lock piece must be operated to release the locked state of the hook support and the hook, and the hook formed by the cooperation of the tip of the hook and the drop-off prevention part forming a part of the hook support. In this structure, the closed state of the opening of the opening must be released.

[0009] However, in the lifting work site, since not only heavy objects such as the above-mentioned iron sheets but also relatively light objects exist as lifting objects, the proposals described in the prior proposals have been made in order to cope with these. The operability of the hook device is not always satisfactory. For example, when a relatively lightweight object to be lifted is tied with a steel wire rope and the rope is to be hooked on the hook portion of the hook device having the above-described structure, and the hook is to be lifted, in the hook device proposed earlier, Procedures of operating the lock piece (unlocking), opening the tip of the hook, and operating (locking) the lock piece after hooking the rope on the hook are necessary.

For this reason, the present inventors need a locking member separate from the falling-off preventing member in order to improve the above-mentioned disadvantage, that is, to lock and unlock the hook portion and the falling-off preventing portion. In order to improve the prior proposal, a hook device was proposed in which the use of a lock member was eliminated and the fall-off prevention member had its function (Japanese Patent Application No. Hei 3-2668).
No. 60, Japanese Patent No. 2813680).

The above-mentioned hook device for lifting a heavy object proposed by the present inventors includes: (i) a hook support portion;
(ii) a hook portion having a hook rear end portion, wherein the rear end portion of the hook portion locks the rear end portion of the following fall-prevention piece when locking the hook portion and the hook support portion. A locking portion, an arc-shaped peripheral edge portion for rotatingly guiding the falling-off prevention piece, and a second locking portion for locking a rear end portion of the falling-off prevention piece when the hook portion is fully inverted. A hook portion having a rear end portion rotatably disposed at an intermediate portion of the hook support portion, and (iii) a drop-off preventing piece having a rear end portion, wherein a rear end of the drop-off preventing piece is provided. Part is rotatably attached to the tip end side of the hook support part, and the rear end part of the drop prevention piece is pressed against the rear end side of the hook part by elastic force. , And a hook device.

However, the hook device having a new structure by the present inventor (Japanese Patent No. 2813680) has the following improvements. That is, in the hook device proposed earlier, the opening of the hook portion is set to the widest angle in order to release the locked state of the hook support portion and the hook portion and to hook the hook portion on the laid iron plate. In order to make the back part abut against the hook support part,
At the time of the 0 ° reverse rotation, the drop-off preventing piece rotatably disposed at the tip of the hook supporter is displaced in a direction not accommodated inside the opening of the hook, and is stated in another word. For example, it is configured to be displaced so as to protrude in a direction forward of the opening of the hook portion.

[0013] For this reason, the falling-out prevention piece is oriented in the correct direction with respect to the hook hole of the oval (elongated) shape arranged on the iron sheet when the iron sheet is hooked. It is desirable to arrange them, but when they are arranged in the wrong direction, an excessive load is applied to the hook device, which may cause damage to the members of the hook part, or may not be able to lift the iron sheet correctly. You.

Note that the arrangement relationship (correct or incorrect) between the above-mentioned falling-off preventing piece (referred to as a retaining portion in the present invention) and an oval (elongated) hole for hooking provided on the iron plate. The arrangement relationship is illustrated by a diagram for describing an embodiment of the present invention described later. Needless to say, the hook device according to the present invention can normally operate the hook device regardless of the arrangement relationship.

The present invention further improves the hook device proposed by the inventors of the present invention (Japanese Patent No. 2813680), and releases the locked state of the hook support portion and the hook portion.
In order to allow a heavy object such as an iron sheet to be hooked by the hook portion, the opening of the hook support portion should be approximately 18 in order to make the opening widest.
It is an object of the present invention to provide a hook device which is excellent in convenience with a new structure in which a stopper portion (drop-off preventing piece) is displaced inside an opening portion of a hook portion when it is turned by 0 ° inversion.

[0016]

SUMMARY OF THE INVENTION In general, the present invention relates to a hook device used for lifting a heavy object, the hook device comprising: 1. A hook support (1) having a two-piece structure in which two pieces of a plate material having a desired planar shape are arranged at a predetermined interval. 2. a wire fixing portion (2) provided at one end (upper portion) (11) of the two-piece hook support (1); The intermediate part (1) of the two-piece hook support (1)
3. a hook part (3) in which a rear part (31) of the hook part (3) is rotatably interposed via a joining pin (A) in 2); The other end (lower part) (13) of the two-piece hook support (1) is connected to the rear part (41) of the retaining part (4) via the joining pin (B) through the opening of the hook part (3). It is interposed rotatably so as to rotate (clockwise) from the part (3a) toward the rear part (31) of the hook part (3), and is arranged to rotate counterclockwise with respect to the joining pin (B). 4. the activated detent (4); A pin (C) arranged at a substantially intermediate portion between the joining pin (A) and the joining pin (B) of the two-stage hook support (1), wherein (i) the hook portion (3). The hanging position of the hook (3) is regulated by rotating the hook portion (3) counterclockwise to abut the rear portion (31) of the hook portion (3), and the final position of the hanging portion is determined by the hook. The part (3) is rotated clockwise to abut the rear part (31) of the hook part (3) to regulate it, and (ii) the hook part (3) of the stopper part (4). The closing position of the opening (3a) at the time of suspension is regulated by contacting the rear part (41) of the retaining part (4) urged counterclockwise, and
5. a pin (C) for regulating the final position of the clockwise rotation of the retaining portion (4) from the blocking position, and The hook part (3) and the stopper part (4) are (iii).
When the hook portion (3) is in a position at the time of suspension with the rear portion (31) abutting on the pin (C), the peripheral side of the rear portion (31) of the hook portion (3) is the pin (C). The hook portion (3) is configured to engage with the peripheral side of the rear portion (41) of the hook portion (4) in contact with the hook portion (4) to prevent the rotation of the hook portion (3) in the hanging direction (clockwise). iv) Rotate the stopper (4) toward the rear (31) of the hook (3) (clockwise).
To release the engagement of the rear portion (31) of the hook portion (3) and the rear side (41) of the rear portion (41) of the retaining portion (4) on the peripheral side surface, and to displace the hook portion (3) to the suspended position. The peripheral surface of the rear portion (31) of the hook portion (3) and the peripheral surface of the rear portion (41) of the retaining portion (4) are slid and displaced, and the rear portion (31) of the hook portion (3) is connected to the joining pin ( C), the end portion (311) of the rear portion (31) of the hook portion (3) and the end portion (411) of the rear portion (41) of the retaining portion (4) when displaced to the final position during hanging. ) Are configured to engage with each other.

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. Further, in the present invention, the rotation (rotation) direction of each member is described as clockwise or counterclockwise in the arrangement shown in the drawing, but if the arrangement is different, the rotation (rotation) direction is naturally described. It goes without saying that is different.

FIG. 1 is a perspective view of the hook device (H) for lifting heavy objects according to the present invention, and FIG. 2 is a front view of the hook device (H) for lifting heavy objects of the present invention. As shown,
The hook device (H) according to the present invention includes a two-piece hook support (1) in which two plate members each having a substantially L-shaped planar shape are arranged at a desired interval, and a wire in the space. The fixing part (2), the hook part (3), and the retaining part (4) are arranged in the manner shown in the drawing.

The hook device (H) of the present invention is provided as a separate component which is an essential component (member) for locking the hook portion and the stopper portion (fall-out preventing portion) in this type of hook device. The use of the locking member is eliminated, and the locking function is realized by the cooperation of the hook portion (3) and the retaining portion (4) as described later.

In the hook device (H) of the present invention, the hook support (1) has a two-piece structure constituted by arranging two plate members having a desired flat shape at a predetermined interval as shown in the figure. Is not limited to For example, it goes without saying that the hook support (1) may have an integrated base, and the other portion may have a bifurcated structure or two plates. is there. However, the two-plate structure shown is economical and the hook device can be easily manufactured.

In the hook device (H) of the present invention, a wire fixing portion (2), a hook portion (3), and a hook portion (3) are provided on the hook support (1) by utilizing the two-piece space. , And a stopper portion (4). Hereinafter, regarding the above-mentioned three components (2, 3, 4) disposed on the hook support (1), particularly, the configuration of the hook portion (3) and the retaining portion (4) and the mutual relationship between the two. explain in detail. In the hook device (H) of the present invention, the pin (C) for regulating the positions of the hook (3) and the retaining portion (4) has an extremely important function, as described later. It should be noted that

The wire fixing section (2) is for fixing an end of a wire rope connected to a winding mechanism provided on a crane or the like, and is provided at one end (1) of the hook support (1). (Upper part) (11).

The hook portion (3) has a rear portion (31) rotatably mounted on the hook support (1) via a joining pin (A) at an intermediate portion (12) of the hook support (1). Fixed.

When the hook part (3) is turned clockwise approximately 180 ° with respect to the hook support (1), the opening part of the hook part (3) is opened as described later. It is rotatably interposed and fixed to the hook support (1) via the connecting pin (B) so as to rotate (clockwise) from (3a) toward the rear part (31). In addition, retaining part (4)
As shown in the figure (particularly see FIG. 2), the hook support (1) is interposed by the spring (43) so as to be always resiliently biased counterclockwise with respect to the joining pin (B). It is fixed.

Next, the pin (C) for regulating the positions of the hook portion (3) and the retaining portion (4) will be described in detail. In order to better understand the configuration of the pin (C), reference should also be made to FIGS.

As shown in the drawing, the pin (C) is provided at a substantially intermediate portion between the joining pin (A) and the joining pin (B) provided on the hook support (1). ,And,
It has the following function in relation to the hook part (3). . The position of the hook portion (3) at the time of suspension, that is, the hook portion (3) maintains the arrangement relationship shown in FIGS. 1 to 3 with respect to the hook support (1) and the retaining portion (4). For this purpose, the hook portion (3) has a function of rotating the hook portion (3) counterclockwise to abut the rear portion (31) of the hook portion (3), thereby regulating the hanging position. . Also, from the position at the time of suspending the hook part (3),
The hook portion (3) is rotated clockwise, that is, the hook portion (3) is rotated clockwise so that the opening (3a) of the hook portion (3) is largely opened. 3) It has a function of restricting the final position at the time of hanging by bringing the rear portion (31) into contact (see FIG. 5).

The pin (C) has the following function in relation to the retaining portion (4). . The closing position of the opening (3a) at the position where the hook portion (3) of the retaining portion (4) is suspended, that is, the retaining portion (4) is the hook support (1) and the hook portion (3). In order to maintain the arrangement shown in FIGS. 1 to 3, the rear part (41) of the retaining part (4) spring-biased counterclockwise with respect to the joining pin (B) abuts. By doing so, it has a function of regulating the closing position of the detachment preventing portion (4). . Further, when the stopper (4) is rotated clockwise from the closed position of the stopper (4), the final position of the clockwise rotation is regulated.

Next, the interrelationship between the hook portion (3), the retaining portion (4) and the joining pin (C) in the hook device (H) of the present invention will be described. In addition, the following description should also refer to FIGS.

[0029] When the hook part (3) is in the position at the time of suspension with the rear part (31) abutting on the pin (C), the peripheral side (31a) of the rear part (31) of the hook part (3) is The rear portion (4) of the retaining portion (4) which contacts the pin (C)
The hook portion (3) is configured to be engaged with the peripheral side (41a) to prevent the hook portion (3) from rotating in the hanging direction (clockwise). In addition, as shown in FIG. 3, in the above-described state, the stopper portion (4) can be rotated clockwise so as to release (unlock) engagement with the hook portion (3). It is composed of

[0030] Further, from the above-mentioned state, the stopper portion (4) is rotated clockwise to rotate the rear portion (31) of the hook portion (3) and the peripheral side surfaces (31a, 41a) of the rear portion (41) of the stopper portion (4). Release the hook at the hook (3)
Is displaced to the hanging position (reversed rotation), the peripheral side surface (3a) of the rear part (31) of the hook part (3) and the peripheral side surface (41a) of the rear part (41) of the retaining part (4) The hooks (3) are slid and displaced from each other, and
When (1) comes into contact with the pin (C) and is displaced to the final position at the time of suspension, the end (311) of the rear part (31) of the hook part (3) and the rear part (41) of the stopper part (4). ) Are configured to engage.

The engagement method of the two members (3, 4) shown in FIG. 5 is such that the projection formed on the end (311) of the hook (3) and the end of the stopper (4) are formed. This is a concave-convex engagement type using the concave portion formed in (411). In the present invention, it goes without saying that the above-mentioned engagement system may be configured as desired.

Hereinafter, the operation of the hook device (H) according to the present invention and an example of its use will be described with reference to the drawings. In addition,
In the following description of the hook device (H), the heavy object to be lifted is an iron sheet having a hole dedicated to hooking. It goes without saying that the object to be lifted in the present invention is not limited to the iron sheet.

When an iron plate, that is, a hole for exclusive use of hook device (H), which is to be hooked, is drilled at a predetermined position, the iron plate having a weight of several tons is lifted by the hook device.
Hook part (3) and detachment prevention part (4) of hook device (H)
When the hook is unlocked and the hook (3) is lifted, the hook (3) is used to efficiently hook and lift the iron plate in the laid state by the hook (3). It is an important requirement that the opening (3a) of (3) can be opened to the widest width (widest angle), and (ii) that the retaining portion (4) does not interfere with the hooking work, in particular. . The hook device (H) of the present invention meets these requirements as described below. Further, the hook device (H) of the present invention is excellent in workability when removing (pulling out) the hook portion (3) from the iron sheet after lifting the iron sheet of several tons and transporting it to a predetermined position. ing.

FIG. 3 is a longitudinal sectional view of the hook device (H) of the present invention. That is, it is a longitudinal sectional view of the hook device (H) shown in FIGS. Hook device (H) of the present invention
In FIG. 3, the state shown in FIG. 3 can be said to be the initial state of the work of lifting the iron plate. Needless to say, the hook device (H) in the state of FIG.
In order to put the hook into use, the locked state is released at the hook portion (3) and the locking portion (4) in the locked state, and the opening (3a) of the hook portion (3) is lifted by the iron plate. In order to do so, the opening must be widest. That is,
It must be turned clockwise up to the maximum with respect to the hook support (1).

In the hook device (H) of the present invention, engagement between the peripheral side surface (31a) of the rear portion (31) of the hook portion (3) and the peripheral side surface (41a) of the rear portion (41) of the retaining portion (4). In order to release the lock between the hook portion (3) and the locking portion (4) in the locked state, the counterclockwise elastic force of the spring body (43) causes the rear portion (4) of the locking portion (4).
1) The retaining portion (4) where the pin (C) is in contact with the pin (C)
The two members (3, 4) may be displaced in the direction of the arrow in the figure and displaced to the position indicated by the dashed line to release the locked state of both members (3, 4).
That is, the distal end portion (42) of the retaining portion (4) is rotated in the direction of the arrow shown in the figure by the elastic force of the spring body (43) in the direction of the rear portion (31) of the hook portion (3). It should be done.

FIG. 4 shows a state in which the hook portion (3) and the stopper portion (4) are unlocked, and the hook support (1) is moved toward the back of the hook portion (3), that is, the counterclockwise direction shown by the arrow. When pivoted around, the peripheral side surface (31a) of the hook part (3) and the peripheral side surface (41a) of the stopper part (4) slide with each other, and the tip part (42) of the stopper part (4). Is approaching while rotating clockwise in the direction of the arrow in the figure toward the rear part (31) of the hook part (3), and the opening part (31a) of the hook part (3) is largely opened. is there.

FIG. 5 shows that the hook support (1) is further rotated counterclockwise from the stage of FIG. 4 so as to approach the back of the hook (3), and (a) the hook (3). The slide displacement on the peripheral side surface (31a) of the hook portion (3) and the peripheral side surface (41a) of the release prevention portion (4) is finished, and (b) the hook portion (3) The end (31) of the rear part (31)
1) is at the end (41) of the rear portion (41) of the retaining portion (4).
1) Entering into the lower side, (c). The end (311) of the hook portion (3) and the end (411) of the stopper portion (4) are engaged and fixed, and the hook portion (3) This shows a state where the opening (3a) is opened to the widest width. In other words, the hook part (3) is maximally inverted from the state shown in FIG. 3 with respect to the hook support (1), and the end part (41) of the stopper part (4).
1 shows a state in which the clockwise rotation is prevented by being engaged and fixed in 1).

FIG. 6 shows the hook device (H) in a state in which the hook portion (3) shown in FIG. 5 is maximally inverted relative to the hook support (1) and the clockwise rotation is prevented. FIG. 6 is a diagram for explaining an example of use of ()), that is, an example of lifting an iron plate.
That is, FIG. 6 shows a hook device (H) according to the present invention for lifting an iron plate (I) laid on the ground (E) as shown and having a hole (O) at a desired position. Is a description of a usage example.

As shown, in the hook device (H) of the present invention, the hook device (1) is turned upside down with respect to the hook support (1), and is fixed by the cooperation (engagement relationship) with the retaining portion (4). The hook portion (3) has a retaining portion (4) in front of the opening (3a) and a rear portion (31) of the hook portion (3).
To turn, approach, close and compactly folded,
In other words, since the space in front of the opening (3a) can be increased, the tip (32) of the hook (3) can be smoothly inserted and pulled into the hole (O) of the iron sheet (I). Can be hung. Further, as described above, since the retaining portion (4) is compactly folded at the rear portion (31) of the hook portion (3), the retaining portion (4) is connected to the hook portion (3).
When the work of hooking the iron sheet (I) to the hole (O) by the above-mentioned work does not come into contact with the ground (E), the work of hooking the iron sheet (I) by the hook part (3) is performed smoothly. .

When a wire connected to a hoist such as a crane is connected to the wire fixing portion (2) of the hook device (H), and the hook device (H) is slightly lifted from the state shown in FIG. 3) Hole (O) of iron plate (I)
Insertion into.

Next, after the hook (3) is completely inserted (hooked) into the hole (O) of the iron plate (I), the engagement of the hook (3) and the stopper (4) is performed. Is released (unlocked). That is, the engagement between the hooks (3) and the ends (311 and 411) of the retaining portions (4) is released. When the hook device (H) is further lifted by a claim or the like, the positional relationship between the hook portion (3) and the retaining portion (4) is changed in the direction opposite to that of FIG. 3 → FIG.
→ FIG. 3), and finally, both members come into contact with each other, and reach the locked state again. Thus, the iron sheet can be safely transported to a desired position.

In the hook device (H) according to the present invention, as described above, the stopper (4) for closing the opening (3a) of the hook (3) unlocks both members to release the hook (3). ), When the opening (3a) is opened at the widest angle, the retaining portion (4) is compactly rotated toward the rear portion (31) of the hook portion (3) as shown in FIGS. It can be folded. The advantage of this is shown in FIGS.

FIG. 7 shows the opening (3a) of the hook (3).
FIG. 4 is a view for explaining a first mode when the iron plate (I) is lifted with the opening at the widest angle. In FIG. 7, the hook portion (3) has a tip (32) of the hook portion (3) in a short diameter direction of the hole portion (O) with respect to the hole portion (O) drilled in the iron sheet (I). And trying to lift the iron plate (I). In this type of hook device for lifting an iron sheet (I), the manner in which the hook portion (3) is inserted into the hole (O) of the iron sheet (I) is correct.

The correct use of the hook device (H) described above, that is, the hole (O) of the iron plate (I) of the hook (3)
In the correct insertion mode, the hook device (H) of the present invention as well as the hook device proposed by the present inventors (for example, Patent No. 2,833,671 or Patent No. 2,833,674). In addition, the iron sheet (I) can be efficiently and safely lifted. However,
Hook device (H) operator (construction site worker)
In some cases, the hook (3) is often inserted in the longitudinal direction of the hole (O) as shown in FIG. Such an insertion mode is likely to occur when the hole (O) has an elliptical (oval) shape having a short diameter and a long diameter and the shape of the hook portion.

In the case of the erroneous insertion described above, the hook device proposed by the present inventors (for example, Japanese Patent No. 2,832)
No. 3,671 or Patent No. 2,833,674), that is, the stopper portion (drop-off preventing piece) is rotated in the opposite direction to the present invention, and is turned so as to be located in front of the opening (3a). In the hook device of the moving type, it is easy to insert the hook portion into the hole (O), but the hook portion (3) and the retaining portion (drop-off preventing piece) are directly attached to the iron plate ( There is a problem in that there is a moment when I) is pinched, and a large weight is applied to the hook device to deform the hook device.

FIG. 8 shows that in the hook device (H) of the present invention, the hook portion (3) is erroneously inserted into the hole (O) of the iron plate (I) in the major axis direction of the hole (O). Even if it is inserted, since the retaining part (4) is compactly folded toward the rear part (31) of the hook part (3), it is possible to smoothly lift the iron plate (I). FIG. As described above, the hook device (H) of the present invention
Can be inserted into the slot (O) of the long hole formed in the iron sheet (I) when lifting the iron sheet (I) from any direction (either in the short diameter direction or the long diameter direction). ) Can be safely and reliably lifted.

Next, after the iron sheet (I) is transported to a predetermined position and laid, the hook device (H), particularly the hook part (3) is removed from the iron sheet (I) weighing several tons. The operation of extracting (extracting) will be described.

The state immediately after the iron sheet (I) is transported to a predetermined position by the hook device (H) of the present invention and laid,
This will be described with reference to FIG. FIG. 3 does not show the iron sheet (I) immediately after being laid, but the iron sheet (I)
Can be considered to be laid in the horizontal direction at the bottom of the hook portion (3) which stands upright in FIG. The bottom of the hook portion (3) and the vicinity thereof bite into the ground (E) below the iron plate (I) (see FIG. 6) due to its own weight of several tons. You can think that you are.

The hook portion (3) in the above-described state can be easily removed (extracted) from the iron sheet (I) as described below. That is, in the hook device (H) of the present invention, as described above, the hook device (H)
Is in the state shown in FIG. 3 immediately after it is laid at a desired position after transporting the iron sheet (I). In this state, the lock (4) is rotated clockwise to unlock the hook (3) and the lock (4), and the hook support (1) is connected to the hook (3). 3), the state shown in FIG. 3 → FIG. 4 → FIG. 5, and the hook part (3) and the retaining part (4) are locked again in the arrangement shown in FIG.

When the hook device (H) in the state of FIG. 5 is pulled up by a crane or the like (not shown), the hook portion (3) is locked together with the stopper portion (4). Since the two members (3, 4) are pulled upward while maintaining the locked state in accordance with the pulling by the like, the tip (32) of the hook portion (3) is placed on the iron plate (I).
From the hole (O). The operation of removing (pulling out) the hook portion (3) from the laid iron plate (I) weighing several tons requires a considerable amount of labor on the operator, but the hook device (H) of the present invention. In, such work is greatly reduced.

[0051]

The hook device according to the present invention can prevent the lifting object from falling off from the hook portion, dropping, and falling accident in the lifting work of various objects as well as heavy structures such as iron plate. Therefore, the safety of field work can be improved. In addition, after lifting a heavy structure such as an iron plate and laying or installing it at a desired place, the hook portion can be very easily and efficiently removed (extracted) from the heavy structure, thereby improving the efficiency of actual work. Can be improved.

[Brief description of the drawings]

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

FIG. 2 is a front view of the hook device of the present invention.

FIG. 3 is a longitudinal sectional view of the hook device of the present invention.

FIG. 4 is an explanatory view of the operation of the hook device of the present invention, showing a state immediately after the engagement between the hook portion and the retaining portion is released (unlocked).

FIG. 5 is an explanatory view of the operation of the hook device of the present invention, showing a state in which the hook portion is turned upside down and the opening is at the widest angle (widest width).

FIG. 6 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 portion is turned upside down and the opening is set to the widest angle.

FIG. 7 is a diagram illustrating a first hooking mode of the hook device of the present invention with respect to the hole of the iron sheet.

FIG. 8 is a view for explaining a second hooking mode with respect to the hole of the iron sheet of the hook device of the present invention.

[Explanation of symbols]

 H Hook device 1 Hook support 2 Hook support 2 Wire fixing portion 3 Hook portion 31 Hook portion rear portion 311 ………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………. ……………………………………………………………………………………………………………………………………………………………………………………. Of the end 43 …………………………………………………………………………………………… Joining pin B ……………… Joining pin C …………… Pin E ………… Ground I ………… …… Iron sheet O …………… Holes in the iron sheet

Claims (4)

[Claims] 1. A hook device used for lifting a heavy object, the hook device comprising: 1. A hook support (1) having a two-piece structure in which two pieces of a plate material having a desired planar shape are arranged at a predetermined interval. 2. a wire fixing portion (2) provided at one end (upper portion) (11) of the two-piece hook support (1); The intermediate part (1) of the two-piece hook support (1)
3. a hook part (3) in which a rear part (31) of the hook part (3) is rotatably interposed via a joining pin (A) in 2); The other end (lower part) (13) of the two-piece hook support (1) is connected to the rear part (41) of the retaining part (4) via the joining pin (B) through the opening of the hook part (3). It is interposed rotatably so as to rotate (clockwise) from the part (3a) toward the rear part (31) of the hook part (3), and is arranged to rotate counterclockwise with respect to the joining pin (B). 4. the activated detent (4); A pin (C) arranged at a substantially intermediate portion between the joining pin (A) and the joining pin (B) of the two-stage hook support (1), wherein (i) the hook portion (3). The hanging position of the hook (3) is regulated by rotating the hook portion (3) counterclockwise to abut the rear portion (31) of the hook portion (3), and the final position of the hanging portion is determined by the hook. The part (3) is rotated clockwise to abut and regulate the rear part (31) of the hook part (3), and (ii) the hook part (3) of the stopper part (4). The closing position of the opening (3a) in the position at the time of suspension is adjusted to the rear part (41) of the retaining part (4) urged counterclockwise.
5. A pin (C) that regulates the final position of the clockwise rotation of the stopper portion (4) from the closed position while restricting the stopper portion (4). The hook part (3) and the stopper part (4) are: (iii) When the hook part (3) is in a position at the time of suspension with its rear part (31) in contact with the pin (C). The hook (3) is hung in the direction in which the hook (3) is suspended by engaging the periphery of the rear (31) of the hook (3) with the periphery of the rear (41) of the retaining portion (4) abutting on the pin (C). (Iv) rotation of the hook (3) is prevented from rotating (clockwise), and (iv).
1) Rotate (clockwise) in the direction to hook part (3)
When the hook (3) is displaced to the hanging position by releasing the engagement of the rear portion (31) of the rear portion (31) and the rear portion (41) of the rear portion (41) with the peripheral side surface, the rear portion of the hook portion (3) is disengaged. The peripheral side surface of (31) and the peripheral side surface of the rear portion (41) of the stopper portion (4) are slid and displaced, and the rear portion (3) of the hook portion (3) is displaced.
When 1) abuts on the joining pin (C) and is displaced to the final position when suspended, the end (311) of the rear portion (31) of the hook portion (3) and the rear portion (3) of the retaining portion (4). 41) The hook device, characterized in that the end (411) of (41) is configured to engage. 2. A rear portion (31) of the hook portion (3) has a substantially triangular planar shape, and its peripheral surface slides on the peripheral surface of the rear portion (41) of the retaining portion (4). When the end (311) is in the final position at the time of suspension in which the end (311) is rotated clockwise with respect to the joining pin (A) and comes into contact with the joining pin (C), the stopper (4) The hook device according to claim 1, wherein the hook device is configured to engage with an end (411) of a rear portion (41). 3. The hook device according to claim 1, wherein the retaining portion (4) is urged counterclockwise by a spring body against the joining pin (B). 4. The hook device according to claim 1, wherein the hook support (1) has an integrated base and the other part has a two-piece structure.