JPH0578090A - 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 to improve safety at the site by composing the device of a hook supporting body, a hook comprising a first and a second engagement parts, and a falling prevention part whose back end part can be rotated and joined to the back end part of the hook by means of impact resilience. CONSTITUTION:A hook device A is composed of a hook supporting body 1, a first engagement part 23 which engages with the back end part 32 of a falling prevention piece when a hook is locked, and a hook 2 having a second engagement part 233 which engages with the back end part 23 of the falling prevention piece upon the maximum inversion of an arc-like peripheral part 232 and the hook 2. The back end part 23 of the hook 2 is rotatively disposed in the middle of the hook supporting body 1 and the back end part 32 of the failing prevention piece can be rotated toward the tip part of the hook supporting body 1 so that it is joined to and engaged with the back end part 23 of the hook by means of impact resilience. As a result, the falling prevention piece 3 is disposed.

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. Further, depending on the type of work at this kind 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. Furthermore,
In the prior art, in order to lock and unlock the hook portion, a lock member separate from the fall prevention member was indispensable, but the present invention eliminates the use of the lock member, and It seeks to provide a new, economical hook device that is functional.

[0008]

The present invention will be summarized as follows.
The present invention provides a hook device for lifting a heavy object, comprising: (i) a hook support (1); (ii) a hook (2) having a hook rear end (23), (23) does not come off when the hook (2) and the hook support (1) are locked.
A first locking part (231) for locking the rear end part (32), the rear end part (3)
Circular arc-shaped peripheral part (232) for turning and guiding 2) and hook (2)
The second locking portion (23) that locks the rear end portion (32) at the maximum reversal of
Hooks (2), (iii) which are composed of 3) and whose rear end portion (23) is rotatably arranged in the intermediate portion (12) of the hook support body (1). A fall prevention piece (3) having a rear end portion (32), wherein the rear end portion (32) is rotatably attached to the front end portion (11) of the hook support (1) and Edge (32)
The present invention relates to a hook device for lifting a heavy object, comprising: a fall prevention piece (3) arranged in pressure contact with a rear end portion (23) of a hook by elastic force.

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 according to a first embodiment 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 a hook support (1).
It consists of three main components: the hook (2), and the cap (3). In the present invention, the use of the lock member, which is an essential component of this kind of hook device, is eliminated, and the locking function is provided to the fall prevention piece (3) as described later. Hereinafter, the three main constituent elements of the hook device (A) of the present invention and their mutual relationships will be described.

In the first embodiment of the present invention, the hook support member (1) has a single plate-like structure as shown in FIGS. 1 and 2, which has a tip portion (11) and an intermediate portion ( 12) and the area of the rear end (13). As shown in FIG.
The rear end portion (23) of the hook (2) is rotatably disposed on the intermediate portion (12) of the hook support body (1) via the joining pin (4). The tip (11) of the hook support (1) is attached to the captive piece (3).
Is a part for arranging. 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 is of any size as long as it accommodates the hook support intermediate portion (12). Is not restricted by. In the following description, the hook rear end of the bifurcated structure has a symmetrical structure,
Only (23) is used as the graphic symbol for the rear end of the hook. In the present invention, the rear end (23) of the bifurcated hook (2) is
The intermediate portion (1) of the hook support (1) is connected via the connecting pin (4).
It is rotatably installed in 2). 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). Hook device of the present invention
(A) eliminates the lock member as an independent and separate member that is essentially used in the prior art as described above, and hooks the lock mechanism (lock and unlock) with the hook (2).
The hook (2) and the cap (3) have a great feature because they are intended to be achieved in cooperation with the cap and the cap (3).

Therefore, as the structure of the hook (2) of the present invention, particularly the structure of the rear end portion (23), the one defined as follows is adopted. (B) The rear end part (23) of the hook is designed to prevent the hook (2) from maintaining the locked state shown in FIG.
It must have a first locking portion (231) that securely engages the rear end portion (32). The first locking portion (23
1) and the rear end portion (32) of the fall-preventing piece are securely engaged by making the rear end portion (32) of the fall-preventing piece always come into pressure contact with the rear end portion (23) of the hook by spring bias as described later. To be 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 fall prevention piece, the hook
(2) When the hook opening width is increased by largely reversing and rotating the (2) upward in the opening / closing direction (b), the rear end part (32) is smoothly displaced and dropped in conjunction with the hook reversing operation. In order to prevent the prevention piece (3) from rotating counterclockwise, the hook rear end portion (23) is preferably an arcuate peripheral edge portion (232). (C) When the lock (2) is maximally inverted, that is, when the tip of the hook support (or the wire fixing part (14)) and the hook back (22) are largely inverted so that they come into contact with each other, the fall prevention piece It is preferable to provide a second engagement portion (233) for engaging and fixing the end portion (32) and for opening the drop-out preventing piece (3) largely during engagement. That is, at the portion where the contact relationship with the arcuate peripheral portion (232) ends, the rear end portion of the fall prevention piece
When the (32) engages with the second locking portion (233), it is preferable to make a large outward reversal rotation (counterclockwise rotation) by the spring biasing force (however, the reverse rotation end position). Are shown in FIG. 4), which allows a larger opening width.

As shown in FIGS. 1 and 2, the fall prevention piece (3) is divided into a fall prevention piece tip portion (31) and a bifurcated structure rear end portion (32). In the present invention, the rear end portion also includes a portion near the end portion. In the present invention,
The fall prevention piece rear end portion (32) of the bifurcated structure is rotatably disposed on the tip end portion (11) of the hook support body (1) through a joining pin (5). At this time, the fall-preventing piece (3) is always pressed by the spring biasing force of the spring (51) so that the peripheral edge (421) of the rear end (32) always becomes the arcuate peripheral edge (231) of the hook rear end (23). It is arranged so as to abut. The spring biasing by the spring (51) may be performed in a normal manner.
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 fall prevention piece.
(3) The one fixed on the side is shown. In FIG. 2, the fall-preventing piece (3) has a tip portion (31) of the hook tip portion (21) due to the spring biasing force of the spring (51).
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 due to the abutting relationship between the first locking portion (231) of the hook rear end portion (23) and the rear end portion (32) of the fall prevention piece, as described above. This is to prevent the rotation. However, the fall prevention piece of the present invention
(3) 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 has the above-mentioned structure of the fall prevention piece (4), and when the fall prevention piece (3) is operated (clockwise) in the state of FIG. First locking part of the rear end part (32) of the fall-out prevention piece (3) and the rear end part (23) of the hook
The engagement (lock state) of (231) is released at the same time. That is, when the object to be lifted is hooked in the state of FIG. 2, for example, when the lightweight object to be lifted which is tied with a steel rope is to be lifted and moved, the fall prevention piece (3 ) Is moved toward the back of the hook (22), and the end of the steel rope (not shown) drawn out from the object to be hung is hooked on the hook (2) at the hook opening (24). .. After hooking, the fall prevention piece (3) is in its original state (closed state in FIG. 2) due to the spring biasing force, that is, the fall prevention piece (3).
When the tip end (31) of the hook and the tip end of the hook (21) come back into contact with each other, the rear end (32) of the fall 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 safely lifted and transported. When the hook-up opening (24) shown in FIG. 2 is closed, the rear end portion (32) of the fall prevention piece (3) contacts the arcuate peripheral edge portion (232) of the hook rear end portion (23). It touches and further movement is regulated. That is, the falling prevention piece (3) is allowed to rotate in the opening / closing direction (a) in the figure, but in the closed state, the movement is restricted at the position shown in FIG. As described above, this is the rear end portion (32) of the fall prevention piece and the rear end portion (23) of the hook.
This is due to the abutting relationship of. 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, rotate the fall prevention piece (3) in the hook back (22) direction. Of the fall prevention piece (3).
2) and the first engaging portion (231) of the hook rear end portion (23) are disengaged, and then the hook support (1) and the hook shown in FIG.
For example, the hook support body (1) is rotated counterclockwise so that the relative positional relationship of (2) is obtained, and finally, as shown in FIG. Good.

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 (3) 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 (3) 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. In FIG. 3, the fall-prevention piece (3) is rotated at the portion indicated by the dotted line in FIG. 2 to remove the first locking portion (231) of the hook rear end (23) and the fall-prevention rear end (32). This shows a state in which the hook support (1) and the hook (2) are slightly displaced upward in the opening / closing direction (b) by disengaging the engagement. At this time, the rear end portion (32) of the fall prevention piece (3) is
Due to the spring bias, the arcuate peripheral edge (23) of the hook rear end (23)
2) Displaces while touching.

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 fall prevention piece (3) have the following mutual relationship. That is, the rear end portion (32) of the fall prevention piece (3) is displaced while contacting the arcuate peripheral edge portion (231) of the hook rear end portion (23) to reach the second locking recess (233), Fit into the recess (233). This fitting secures the maximum displacement amount of the fall prevention piece (4) and restricts further rotation. If the cap (3) has a cam shape (eccentric shape) as shown in the figure, when it is fitted into the recess (233), the cap (3) is largely turned upside down by the spring biasing force. It can be moved open to maximize the opening width of the hook.

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 (3) arranged on the ground does not hit the ground (E), the hole (H) for exclusive use in hooking that is 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. Further, in order to remove the hook device (A) from the iron plate (I), it can be easily removed by returning to the state of FIG.

FIG. 6 is a perspective view of a hook device (A) for lifting a heavy object 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 rear end (23) of the hook and the rear end (32) of the cap
3 shows the arrangement relationship of. The second embodiment shown in FIGS. 6 to 7 is compared with the first embodiment described above.
(A) The hook support (1) has a bifurcated structure,
(B) The rear end portion (23) of the hook and the rear end portion (32) of the fall-preventing piece have a single-plate structure, and (c) the spring biasing mode is such that one end of the spring body (51) is pin ( It is substantially the same as that of the first embodiment except that it is engaged with 6).

[0022]

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 in the hole (hooking port) provided in the heavy structure, and the hook tip and the fall-prevention piece are locked together during lifting and transporting. 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 fall prevention piece and the hook tip portion 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, displace the fall prevention piece inside the hook opening to the back of the hook,
It is only necessary to hook the object to be lifted and return the fall prevention piece to the original position, and it is possible to safely hoist and carry the object to be lifted.As described above, the hook position of the present invention is not limited to heavy structures and various types. In the lifting work of the object of
Since it is possible to prevent the object to be lifted from falling due to the hook coming off and falling accidents, it is possible to improve the safety of on-site work, which is significant.

[Brief description of drawings]

FIG. 1 is a perspective view of a hook device according to a first embodiment 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 the engagement between the rear end portion of the hook and the rear end portion of the drop prevention piece is released and the lock is released.

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.

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 in which a part of a main part of a second embodiment of the present invention is cut away.

[Explanation of symbols]

 A …………………… Hook device 1 …………………… Hook support 2 …………………… Hook 23 ……………… Hook rear end 231 ……………… First section Stop part 232 ……………… Circular arc-shaped peripheral part 232 ……………… Second locking part 3 …………………… Fall-out prevention piece 4, 5 ……………… Joining pin 51 ……………… … Spring body a, b …………… Opening and closing direction I …………………… Iron plate H ………………… Lifting hole E ………………… Ground

Claims (9)

[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 (23), The first part (23) locks the rear end part (32) of the cap (3) when the hook (2) and the hook support (1) are locked.
The locking portion (231), the arcuate peripheral edge portion (232) for rotationally guiding the rear end portion (32), and the rear end portion (32) at the maximum reversal of the hook (2)
A second locking portion (233) for locking the hook, and the hook rear end portion (23) has an intermediate portion (1) of the hook support body (1).
(2) a hook (2) rotatably disposed, (iii) a fall prevention piece (3) having a rear end portion (32) of the fall prevention piece, wherein the rear end portion (32) is A fall-prevention piece rotatably attached to the front end (11) of the hook support (1), and the rear end (32) of the hook support (1) being pressed against the rear end (23) of the hook by elastic force.
(3) A hook device for lifting a heavy object, comprising: 2. The hook device for lifting a heavy object according to claim 1, wherein the hook support member (1) has a single plate structure or a bifurcated structure. 3. When the hook support (1) has a single plate structure, the hook (2) has a rear end portion (23) and a fall prevention piece (3).
The hook device for lifting heavy objects according to claim 1, wherein the rear end portion (32) has a bifurcated structure. 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 fall prevention piece (3) have a single plate structure. The hook device for lifting heavy objects according to claim 1. 5. The heavy article according to claim 1, wherein the hook rear end portion (23) is rotatably disposed on the hook support intermediate portion (12) through a joining pin (4). Hook device for lifting. 6. The rear end portion (32) of the fall prevention piece has a joining pin (5).
The hook device for lifting a heavy object according to claim 1, wherein the hook device is rotatably disposed on the tip end portion (11) of the hook support member via the. 7. The stopper pin rear end portion (32) has a joining pin (5).
The heavy-weight lifting hook device according to claim 6, wherein the hook body is wound around the spring body (51) and is pressed and locked to the rear end portion (23) of the hook. 8. The hook tip portion (21) of the fall prevention piece (3) is formed by a spring body (51) wound around a joint pin (5).
The hook device for lifting a heavy object according to claim 6, wherein the hook device is pressed against and closes the hook opening (24). 9. The fall-preventing piece (3) is capable of rotating and returning the hook opening (24) inward by a spring body (51) wound around the joint pin (5). Item 7. A hook device for lifting heavy objects according to Item 6.