JP4002664B2 - Hook device for lifting heavy objects - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a hook device used when lifting a heavy object such as an iron plate or a block body at a construction site or the like.
More specifically, the present invention can reliably and easily hang a heavy object such as an iron plate or a block body, eliminate the risk of dropping when lifting, and easily remove it from the heavy object. The present invention relates to a hook device that can be used exclusively for lifting heavy objects.
[0002]
[Prior art]
Conventionally, iron plates (laying iron plates) weighing several tons have been used on many construction sites as a scaffold for soft ground. Depending on the type of work at this type of construction site, the iron plate must be moved constantly, and for that purpose, lifting work is performed using a crane or the like.
That is, the work of lifting and moving the iron plate as the above-mentioned scaffold is made by making a hole for lifting in a desired part of the iron plate, passing a wire through this hole, and hooking the wire on the hook. Is doing.
[0003]
As a structure of a conventional hook device that is frequently used for lifting an iron plate (also called a laid iron plate) having a weight of several tons, there is the following structure.
(i) There is a structure in which a drop prevention plate that is urged by a resilient force and abuts against the tip of the hook is disposed on the hook body, and the opening width of the hook tip is set to be extremely small. Needless to say, the reason for narrowing the opening width of the tip of the hook is to prevent the wire from coming off as much as possible.
[0004]
(ii) In addition, there is a structure in which the hook device is constituted by a separate hook support and a hook part, and both members (hook support and hook part) can be rotated with respect to each other. Note that when the heavy object is lifted, the tip of the hook support and the tip of the hook come into contact with each other, thereby fulfilling the function of preventing falling.
The hook device described above is of a type in which a wire attached to a heavy object is simply hooked on the hook portion, and the opening width of the hook tip when the hook support and the hook portion are rotated is extremely narrow. Is set.
[0005]
However, in the field work, the work itself is very hard work to hang the wire on the laying iron plate that weighs several tons. The hook part of the hook device (hook tip) It is directly inserted into a lifting hole drilled in the laid iron plate and lifted. In this case, as described above, since the opening width of the hook tip portion is set to be extremely small, the operation itself of hooking the hook tip portion on the laying iron plate is extremely difficult. That is, when hooking and lifting an object laid on the ground like a laid iron plate, in the conventional hook device, the hook opening width of the hook portion is set to be extremely small, so it cannot be easily hooked. Moreover, even if it can be hooked, it is difficult to remove the hook part at the time of detachment.
[0006]
For this reason, it is originally impossible to use a hook device without a fall prevention device for this type of work, but there are no fall prevention devices at many work sites and the opening width is set large. At present, the one having a hook portion is used.
However, it is quite dangerous to use a hook device having a hook part with a large opening width without a fall prevention device for this type of work.
If this point is seen concretely, when the laying iron plate which is a heavy article is lifted with the hook apparatus without a drop-off prevention device, it will hardly come off. However, when the laying iron plate is installed on the ground, looseness of the suspension wire or the like causes play between the lifting hole and the hook part, and the hook part often comes off the hole. Once the hook part is removed from the hole, it will lead to a fall accident of the iron plate, and there is a danger that a person will lay down and lead to a fatal accident. In reality, there are many fatal accidents due to the fall of the iron plate that weighs several tons at this kind of work site.
[0007]
The present inventors have intensively and studied to solve the problems of the prior art described above, and have already proposed several new hook devices.
For example, the present inventors configured the hook device as a separate hook part and a hook support body having a drop-off prevention part, and the hook part is rotatably disposed on the hook support body. The part is substantially unlocked and released from the locked state (the state in which the hook portion is in contact with the drop-off preventing portion formed integrally with the hook support body and the hook opening portion is closed). When it is structured to be able to rotate 180 °, that is, when the opening width between the hook part and the drop-off prevention part formed integrally with the hook support is configured to be extremely large compared to the conventional case, The hook part can be easily inserted into the hooking hole provided in the heavy object when the heavy object such as a laid iron plate laid on the ground is hooked. The drop-off prevention part is ground when It has been found that it is easy to detach and attach the hook part because it does not abut against or be buried in the throat, and a hook device having a new structure based on these findings has been proposed previously (Japanese Patent Application No. 3). -53112 and 3-216524).
[0008]
The hook device proposed previously by the present inventors, which is particularly useful for lifting a laid iron plate, is initially in the process of hooking the laid iron plate in the laid state to the hook portion and transporting it to another laying location. It is possible to exhibit the excellent effects of. That is, the proposed hook device can easily and surely hook the hook portion into the lifting hole of the laid iron plate, can surely prevent the falling during transportation, and is laid at another laying place. In this case, even if the lifting rope is loosened, it is possible to exert excellent effects such as that the hook portion does not come off from the laid iron plate.
[0009]
The hook device of the above-mentioned configuration proposed by the present inventors (see Japanese Patent Application Nos. 3-53112 and 3-216524) conveys the laying iron plate to the laying place, lays it, and then hooks the hook device from the laying iron plate. From the viewpoint of workability when removing the whole, there is room for improvement.
That is, in the hook device proposed previously by the present inventors, since the operation of detaching (removing) the entire hook device from the laying iron plate is a method depending on the worker, the structure of the drop-off preventing portion described above. Although there is an advantage based on the above, it is not easy to detach (remove) the entire hook device, in particular, the hook portion from the iron plate having a weight of several tons.
[0010]
Also in this regard, the present inventors have previously proposed a hook device provided with a mechanism for facilitating the detachment of the hook device from the laid iron plate (see Japanese Patent Application No. 4-267923).
The above-mentioned proposal (Japanese Patent Application No. 4-267923) for facilitating the detachment of the hook portion is a characteristic of the earlier hook devices of the present inventors (see Japanese Patent Application Nos. 3-53112 and 3-216524). That is, when the lock is released, the hook portion and the hook support are turned and rotated approximately 180 °, and the characteristic is that the back portion of the hook portion is turned and turned to the position where it abuts the side portion of the hook support. .
[0011]
That is, the above-mentioned proposal (Japanese Patent Application No. 4-267923) relating to the easy attachment / detachment of the hook portion by the present inventors described above when the back portion of the hook is in contact with the side portion of the hook support. An extraction lock for assisting the removal of the hook part from the heavy object while maintaining the relationship is configured as follows.
That is, the extraction lock is configured by disposing a main body of the extraction lock on the hook support side and an engaging portion for engaging the extraction lock main body on the hook portion side.
[0012]
The above-described means for facilitating the detachment of the hook portion proposed by the present inventors is, for example, that the hook portion is hooked on a laid iron plate, transported and laid to a predetermined laying place, and then the hook portion is moved from the laid iron plate to the operator. It can be easily detached without imposing a burden on.
this is,
(1). The hook device previously proposed by the present inventors is premised on the use of a crane (hoist),
(2) Therefore, when removing and attaching the hook part from a heavy object such as a laid iron plate having a weight of several tons, the power of the crane can be used without depending on the human power of the operator.
(3) For this reason, if the power of the crane is used under the engagement relationship between the extraction lock main body and the engaging portion of the extraction lock described above, the hook portion can be easily removed from the heavy object. Can do.
[0013]
[Problems to be solved by the invention]
As described above, the hook device for lifting heavy objects previously proposed by the present inventors (see Japanese Patent Application Nos. 3-53112, 3-216524, and 4-267923) is improved to a certain extent. It is superior to the conventional one in safety and removal.
That is, the superiority of the hook device for lifting heavy objects previously proposed by the present inventors is manifested when the hook device is used in a normal use mode.
The normal usage mode described above is the following mode.
That is, in the case of an object to be lifted, for example, a laid iron plate having a weight of several tons, a hook portion is inserted into the laid iron plate in advance in order to facilitate lifting work on one side and in the vicinity of the central end portion. And a hole having a long hole in a direction perpendicular to the laying direction of the laying iron plate for positive insertion and locking of the conventional hook portion. It is formed as follows.
The normal use of the various improved hook devices previously proposed by the inventors described above is as follows (details will be described later with reference to the drawings). It is a mode of hooking in the minor axis direction.
[0014]
However, in the normal use mode of the hook device previously proposed by the present inventors, the hooking direction of the hook portion with respect to the hole portion of the laying iron plate is used in the conventional hook device or originally in this kind of work. The direction is opposite to the hooking direction of the hook portion of the hook device that does not have the prohibited drop-off prevention mechanism. In the above-described lifting operation, the use of a hook device having a large opening without a drop-off prevention (slack prevention) mechanism is prohibited, but it is actually used as described above.
That is, the hook device having a large opening width of the hook portion without the conventional drop-off prevention (slack prevention) mechanism is used in such a manner that the hook portion is hooked in the long hole (long diameter) direction of the hole portion of the long hole. This is a normal use mode.
In the usage mode of the conventional hook device described above, when the hook iron plate is lifted by hooking the hook portion in the direction of the long hole (long diameter) of the hole portion, the hook portion is also inclined as the iron plate is gradually inclined. The suspension ring (fixed ring of the wire rope) at the upper part of the hook part is pulled in the lateral direction with respect to the wire rope fixed to the tip of the crane. For this reason, a hook front-end | tip part rotates in the said long hole, and a laying iron plate comes to be settled in the optimal lifting position of a hook part.
[0015]
On the other hand, as described above, the normal usage mode of the hook device previously proposed by the present inventors is different from the conventional usage mode, that is, the hooking direction of the hook portion with respect to the laying iron plate is completely different. .
When the hook device previously proposed by the present inventors is used in a conventional usage mode, the tip end portion of the drop-off prevention portion integrally formed with the hook support at the time of lifting interferes with the laying iron plate. The hook portion cannot be rotated inside the hole portion of the laid iron plate, and a problem that the lifting posture cannot be normally taken is caused (see FIGS. 9 to 11 described later).
[0016]
Further, in the hook device comprising the hook portion proposed by the present inventors and the hook support body having the drop-off preventing portion formed integrally with the hook portion (which will also be described in detail later with reference to the drawings), A relatively long drop-off prevention unit formed integrally with the hook support may contact other components when lifting the laid iron plate or installing the laid iron plate in a predetermined place after lifting. There is a problem of contact.
[0017]
The present invention eliminates the problems seen when the hook device previously proposed by the present inventors is illegally used and allows any hooking mode of the hook portion with respect to the hooking hole portion of the laying iron plate. It is an object of the present invention to provide a hook device for lifting heavy objects such as a laid iron plate that can be used and is excellent in safety, operability, and removal.
[0018]
The present inventor has intensively studied a solution to the above-mentioned problem. As a result, the present inventor made the basic configuration of the hook device a conventional hook device configuration, in other words, a configuration in which a hook support body and a hook portion manufactured as separate members were rotatably joined, In the direction of the back of the hook portion of the hook support so as not to contact the object to be suspended (heavy object) suspended from the hook portion with the stopper piece that closes the tip opening portion of the hook portion. When the structure of rotating and refracting is added along with the rotation, the above problem is solved, in other words, it can be used without a sense of incongruity under the same usage as the conventional type. And found that there was no problem in workability.
The present invention has been completed on the basis of the above knowledge, and the present invention provides a hook device for lifting heavy objects that is excellent in safety, operability, and removal.
[0019]
[Means for Solving the Problems]
In summary, the present invention provides a hook device (A) that is attached to the tip of a wire of a lifting device and lifts a heavy object.
(i) A hook having a tip end portion (11) rotatably joined to the hook (3) at one end and a wire fixing portion (12) for fixing a wire from the lifting device to the other end. Support (1),
(ii). A hook (3) comprising a hook-shaped tip portion (31) and a rear end portion (32, 32 ') of a bifurcated structure, between the rear end portion (32, 32') of the bifurcated structure A hook (3) that rotatably joins the front end portion (11) of the hook support (1) into the space of the rear end portion (32, 32 ') via a joint pin (2) exaggerated on ),
(iii) A detachment preventing portion (4) for closing the opening (3a) of the hook (3) when lifting a heavy load to prevent the heavy load from coming off the hook tip (31). Stop (4)
(iii) -1.The tip (41a) is disposed so as to substantially contact the hook tip (31) of the hook (3), and the rear end (41b) is a bifurcated structure of the hook (3). A closing piece (41) arranged in the vicinity of the rear end (32, 32 ′),
(iii) -2. For a closing piece disposed at the lower portion of the tip end portion (11) of the hook support (1) in the space of the rear end portion (32, 32 ') of the bifurcated structure of the hook (3) An upper support arm (42),
The intermediate part (42a) is joined so as to be rotatable in the space of the rear end part (32, 32 ') of the bifurcated structure,
The front end portion (42b) is rotatably joined to the rear end portion (41b) of the closing piece (41), and
That rear The end (42c) serves as an operating lever that guides the upper support arm (42) for closing in the same direction when the hook support (1) rotates in the direction of the back (33) of the hook (3). Configured as
(iii) -3. A closing piece lower stage support arm (disposed in the lower part of the closing upper stage support arm (42) in the space of the rear end (32, 32 ') of the bifurcated structure of the hook (3) ( 43)
The rear end (43a) is rotatably joined in the space of the rear end (32, 32 ') of the bifurcated structure, and
The tip (43b) is rotatably joined to the intermediate part (41c) of the closing piece (41),
(iii) -4. The upper support arm (42) for the closing piece and the lower support arm (43) for the closing piece are used when the hook support (1) rotates in the direction of the back (33) of the hook (3). The arms (42, 43) rotate in the same direction via the operation lever (42c), and the closing piece (41) is moved from the closing position of the hook opening (3a) to the opening position in conjunction with the rotation. Is to be displaced
The present invention relates to a hook device for lifting a heavy article.
[0020]
Hereinafter, the technical configuration and embodiments of the present invention will be described in detail with reference to the drawings.
Needless to say, the present invention is not limited to the illustrated one.
[0021]
1-5 is a figure explaining the 1st embodiment of the hook apparatus (A) for heavy load lifting of this invention.
FIG. 1 is a front view of a hook device (A) for lifting heavy objects according to the present invention, and FIG. 2 is an overall perspective view.
3 to 5 are longitudinal sectional views (cross-sectional view cut along a plane parallel to the paper surface in FIG. 1) of the heavy load lifting hook device (A) of the present invention, and in particular, a hook opening (3a FIG. 6 is a diagram for explaining the configuration and operation of a slip-off preventing portion (4) including a closing piece (41) that closes the opening portion of FIG.
[0022]
1 to 3 can be said to show the state when the lifting device (A) for lifting heavy objects according to the present invention lifts an object to be lifted (heavy object such as a laid iron plate).
Accordingly, FIGS. 1 to 3 show the organic relationship between the components (members) of the weight lifting hook device (A) of the present invention under the state where the predetermined weight is lifted. It is shown.
[0023]
As shown in FIGS. 1 to 3, the heavy load lifting hook device (A) of the present invention is roughly divided into (i) a hook support (1), (ii) a hook (3), and (iii). It consists of three components of the locking part (4).
[0024]
(i) The hook support (1) is a hook support (1) manufactured separately from other members, and has a hook-shaped hook with a bifurcated rear end on one end side ( 3) A wire for fixing a wire from a lifting device such as a crane (not shown) on the other end side having a tip end portion (11) that is rotatably joined by a joining pin (2) at the rear end portion. It is comprised with the plate-shaped body which has a fixing | fixed part (12).
[0025]
The weight lifting device (A) of the present invention will be described in detail with reference to FIG. 5, which will be described later, in FIGS. As a configuration for assisting the removal of the hook device (A) from the laid iron plate after the iron plate is lifted and set at a predetermined installation location, one having a removal lock (5) is shown.
That is, in FIGS. 1 to 3, as the extraction lock (5), an extraction lock main body (51) on the hook support (1) side and an engaging portion on the back (33) side of the hook (3). A structure in which (52) is arranged is shown.
However, it should be noted that, in the heavy load lifting device (A) of the present invention, the above-described removal lock (5) is a desired component and is not essential.
[0026]
(ii) The hook (3) is manufactured separately from the hook support (1), and has a hook-shaped tip (31) and a bifurcated rear end (32, 32 ′), and the front end portion (11) of the hook support (1) can be freely rotated through the joining pin (2) in the space of the rear end portion (32, 32 ′) of the bifurcated structure. It is configured so that it can be disposed.
In the rear end portion (32, 32 ') of the bifurcated structure of the present invention, the space space formed by the bifurcated structure connects the tip end portion (11) of the hook support (1) via the joining pin (2). While being rotatably arranged, it is configured to have a size that can accommodate upper and lower support arms (42, 43) of a stopper portion (4) to be described later.
[0027]
(iii) The locking part (4) is one of the major features of the hook device (A) of the present invention, which closes the opening (3a) of the hook (3) when lifting heavy objects. Thus, it has a function of preventing the heavy object from coming off from the hook tip (31). In addition, the anti-separation part (4) is rotated upward so as not to come into contact with the heavy object when the heavy object is lifted and installed at a predetermined installation location and the heavy object is removed from the hook part. It has a function of refraction and releasing the closed state of the hook opening (3a) to make it open.
[0028]
In the heavy equipment lifting hook device (A) according to the first embodiment of the present invention, the detachment preventing portion (4) is roughly classified into (iii) -1. Closing piece (41), (iii) -2. It consists of three components: an upper support arm (42) for use, and (iii) -3. A lower support arm (43) for a closing piece.
[0029]
(iii) -1. As shown in the figure, the closing piece (41) is arranged so that the tip end portion (41a) thereof is substantially in contact with the hook tip end portion (31) of the hook (3), and thereafter The end (41b) is disposed in the vicinity of the rear end (32, 32 ') of the bifurcated structure of the hook (3).
The arrangement relationship that the tip (41a) substantially abuts on the hook tip (31) of the hook (3) is that heavy objects suspended in the hook do not fall off the hook during transportation. It is not always necessary that both (41a, 31) are in contact with each other.
[0030]
(iii) -2. The upper support arm (42) for the closing piece is provided in the space of the rear end (32, 32 ') of the bifurcated structure of the hook (3) and via the safety pin (2). The hook support (1) is disposed and disposed below the tip end (11) of the hook support (1).
A specific arrangement mode of the upper support arm (42) for the closing piece is as follows.
(1) The substantially intermediate portion (42a) is rotatably disposed via a joining pin (42a ′) in the space of the rear end portion (32, 32 ′) of the bifurcated structure.
(2) The front end portion (42b) is rotatably disposed on the rear end portion (41b) of the closing piece (41) via a joining pin (42b ′).
(3) The rear end (42c) rotates the closing upper support arm (42) in the same direction when the hook support (1) rotates in the direction of the back (33) of the hook (3). It is configured to be an operation lever for moving guidance. The rear end (42c) may be referred to as an operation lever (42c).
[0031]
(iii) -3. The closing lower arm (43) is a lower portion of the closing upper support arm (42) in the space of the rear end portion (32, 32 ') of the bifurcated structure of the hook (3). Arranged and arranged.
A specific arrangement mode of the upper support arm (43) for closing is as follows.
(1) The rear end portion (43a) is rotatably disposed through the joining pin (43a ′) in the space of the rear end portion (32, 32 ′) of the bifurcated structure.
(2) The distal end portion (43b) is rotatably disposed at a substantially intermediate portion (41c) of the closing piece (41) via a joining pin (43b ′).
[0032]
In the upper support arm (42) for the closing piece and the lower support arm (43) for the closing piece configured as described above, the hook support (1) rotates in the direction of the back portion (33) of the hook (3). When both the arms (42, 43) rotate in the same direction via the operation lever (42c), the closing piece (41) is opened from the closing position of the hook opening (3a) in conjunction with the rotation. It can be displaced to a position.
The displacement of the closing piece (41) from the closing position to the opening position in conjunction with the rotation of the arms (42, 43) is caused by the fact that the tip (41a) of the closing piece (41) is suspended from the hook portion. This is done by turning and refracting upward so as not to come into contact with a heavy object (for example, a part of a laid iron plate).
Although this point will be described later in detail, it is shown in FIGS. That is, paying attention to the closing piece (41), FIG. 3 shows the initial state of the closing piece (41), and FIGS. 4 to 5 show the final state after the rotation and refraction of the closing piece (41).
[0033]
In the heavy article hanging hook device (A) of the present invention, the closing lower arm (43) may be joined to the closing piece (41) as follows.
That is, the distal end portion (43b) of the closing lower arm (43) and the substantially intermediate portion (41c) of the closing piece (41) are joined to each other via the joining pin (43b ′) so as to be rotatable. As shown in FIG. 4, the spring may be elastically biased to increase the closing force of the closing piece (41) via the spring (43b ″).
[0034]
Next, with reference to FIGS. 3-5, operation | movement description of the hook apparatus (A) for heavy article suspension of this invention, especially operation | movement description of a detachment prevention part (4) are given.
(i) FIG. 3 shows a state in which the heavy load lifting device (A) of the present invention suspends a heavy load (not shown) as described above. At this time, as shown in the figure, the locking part (4) is arranged at a position to close the hook opening (3a).
(ii). FIG. 4 shows that the hook device (A) for lifting heavy objects according to the present invention transports and installs heavy objects to a predetermined installation place, and lifts heavy wire lifting wire ropes and the like from the hook part (3). The state when removing is shown. At this time, as shown in the figure, the locking part (4) is disposed at a position where the hook opening (3a) is opened.
As shown in FIG. 4, the control lever (42c) is moved counterclockwise from the state of FIG. 3 as shown in FIG. 4, in other words, the hook support (1) is hooked with respect to the hook (3). When manually rotated in the direction of rotating in the direction of the back portion (33) of (3), the closing piece (41), the upper support arm (42) for the closing piece that is the main body of the operation lever (42c), and Since the three members of the lower support arm (43) for the closing piece are connected to each other so as to be rotatable, these three members (41, 42, 43) are arranged in the direction of manual rotation of the operation lever (42c). Will be rotated.
[0035]
Although the rotation trajectory between FIGS. 3 and 4 of the locking part (4) is not shown in the drawing, the arrangement of the two support arms (42, 43) indicates that the blocking piece (41) The rotation trajectory is such that the tip (41a) of the hook part (3) does not come into contact with a part of the heavy wire lifting wire rope or the laid iron plate existing in the hook part (3), and as a whole, That is, the trajectory of turning and refraction so as to be drawn in the direction of the rear end portion (32, 32 ') of the bifurcated structure is to be finished.
[0036]
(iii). FIG. 5 shows that the operation lever (42c) shown in FIG. 4 is rotated manually by reversing the hook support (1) toward the back (33) of the hook (3). A mode performed in conjunction with the rotation will be described. Even in this case, as described with reference to FIG. 4, the closing piece (41) of the locking portion (4) can be rotated and refracted from the closing position of the hook opening (3a) to the opening position. it can.
[0037]
In the heavy article hanging hook device (A) of the present invention, the heavy iron load is applied to the hook tip portion (31) after transporting and installing the iron plate as a heavy object to a predetermined installation location (this state) Should be considered as shown in Fig. 4 or Fig. 5.) Removing the hook device from the installed iron plate (sampling operation) requires considerable labor.
1 to 5 show the structure of a removal lock (5) that assists (supports) the removal.
In particular, as shown in FIGS. 1 and 5, when the hook support (1) is in an arrangement relationship that substantially contacts the back portion (33) of the hook (3), the hook device (A) is maintained while maintaining the arrangement relationship. As an extraction lock (5) for assisting the removal of a heavy object from an extraction lock body (51) disposed on the side of the hook support (1) and a back part (33) of the hook (3) It shows what consists of the latching | locking part (52) arrange | positioned by the side.
[0038]
The use mode of the extraction lock (5) is shown in FIG.
As shown in FIG. 5, after a heavy object such as a laying iron plate is conveyed and set to a predetermined position by the hook device (A) of the present invention, it is engaged with the extraction lock body (51) of the extraction lock (5). Lock part 52. Next, the wire fixing portion (12) of the hook support (1) is pulled upward using the force of a lifting device such as a crane (not shown). As a result, the hook tip (31) is rotated and easily removed from the hooking hole of the laid iron plate.
[0039]
FIG. 6 is a longitudinal cross-sectional view of the heavy load lifting device (A) according to the second embodiment of the present invention, and corresponds to FIG. 3 according to the first embodiment.
A characteristic point of the heavy load lifting device (A) of the second embodiment of the present invention shown in FIG. 6 is that the hook support (1) is always rotated in the direction of the back (33) of the hook (3). It is the point which prevented the dynamic state. In addition, the thing of said 1st embodiment (refer FIG. 3) is a type in which a hook support body (1) always rotates to the back part (33) direction of the hook (3) of a hook support body (1). is there.
[0040]
The type in which the hook support (1) always rotates in the direction of the back part (33) of the hook (3) can be used for cranes, etc. during lifting of heavy objects or installation of heavy objects at a predetermined location. There is a risk that the hook support (1) will rotate and actuate the operation lever when the wire rope from the lifting device sags for some reason. In such a case, the hook opening (3a) is in an open state, and there is a risk that a heavy object may come off from the hook part (3).
[0041]
In order to eliminate the above-described problems, in the hook device (A) for lifting heavy objects according to the second embodiment of the present invention, as shown in FIG.
(i) The tip (11) of the hook support (1) is configured to have a locking projection (11a) on its peripheral edge, and
(ii) The upper support arm (42) for the closing piece is configured to have a locking recess (42d) for locking the locking protrusion (11a).
With the hook support body (1) and the upper support arm (42) for the closing piece, the hook of the hook support body (1) is engaged by the engagement of the locking projection (11a) and the locking recess (42d). The rotation of (3) in the direction of the back (33) is prevented.
Needless to say, the engagement lock of the hook support (1) and the upper support arm (42) for the closing piece is released manually by operating the lever for the upper support arm (42) for the closing piece. (42c) is performed by rotating counterclockwise.
[0042]
Next, regarding the advantage in use of the heavy load lifting hook device (A) of the present invention, the hook device previously proposed by the inventors in which the drop-off preventing portion is integrally formed (Japanese Patent Application No. 3-53112, ibid. Reference is made to the drawings in connection with Japanese Patent No. 3-216524.
Incidentally, the device previously proposed by the present inventors is indicated by an English symbol (B), and the drop-off prevention portion formed integrally with the hook support (1) is a locking portion ( It is shown by the symbol (4 ′) in relation to 4).
[0043]
7 to 8 are views for explaining one advantage in using the hook device (A) of the present invention.
As shown in FIG. 7, the hook device (B) proposed by the present inventors conveys the laid iron plate (C) and the ground (D) near the structure such as the edge of the wall (E). If you try to install it on the wall, the drop-off prevention part (4 ') hits the wall (E), and it cannot be installed in an appropriate installation location, or it cannot be removed from the hooked iron plate (C) There is. In the figure (C ₁ ) Indicates a lifting hole for the laid iron plate.
On the other hand, the hook device (A) of the present invention shown in FIG. 8 is appropriately installed even if there is no allowance between the iron plate (C) and the wall (E) due to the structure of the stopper (4). It is possible to easily remove the hook (3) from the hole of the laid iron plate (C).
[0044]
9-14 is a figure explaining the other advantage on use of the hook apparatus (A) of this invention.
Here, FIGS. 9-11 is a figure explaining the usage aspect of the hook apparatus (B) which the present inventors proposed previously. On the other hand, FIGS. 12-14 is a figure explaining the usage condition of the hook apparatus (A) of this invention corresponding to the said FIGS. 9-11.
Compare the usage of the hook device (B) previously proposed by the inventors shown in FIGS. 9 to 11 and the usage of the hook device (A) of the invention shown in FIGS. For example, the advantages of using the hook device (A) of the present invention are obvious. Hereinafter, this point will be specifically described.
[0045]
FIG. 9 shows a case in which the hook device (B) proposed previously by the present inventors is used and a hole (C ₁ ) Shows a mode of hooking the hooked iron plate (C) from the longitudinal direction.
In addition, the hole (C ₁ ) Is easily understood with reference to FIG. Such a hole (C ₁ ) In which the hook is hooked from the longitudinal direction is not that of the normal normal use of the hook device (B).
In this case, the drop prevention part (4 ′) and the hook tip of the hook device (B) clamp the laying iron plate (C) as shown in FIG. 9, and the hook rotates to the normal hook position. Can not do.
Note that the generation of the clamping force described above is based on the point that the lifting force by the crane wire is applied to the wire fixing portion and the turning point of the hook that is pivotably joined to the hook support as shown in FIG. This is because there is a gap in the direction of force. The magnitude of the deviation is indicated by the symbol W in FIG.
[0046]
It is clear how dangerous the suspended state of the iron plate (C) shown in FIGS. As a matter of course, an excessive bending force is applied to the entire hook device (B), and there is a risk of failure such as bending of the hook support or hook portion or bending of the drop-off prevention portion (4 ′). Note that the use of the hook device (B) described above is prohibited in the crane safety regulations, JIS standard B-2803, hook usage standards, and the like.
[0047]
FIG. 12 shows a case where the hook device (A) of the present invention is used and a hole (C ₁ ) Shows a mode of hooking the hooked iron plate (C) from the longitudinal direction. That is, the laying iron plate (C) is to be lifted by the hook device (A) of the present invention in the same manner as in FIG.
In this case, as shown in FIG. 13, the locking device (4) of the hook device (A) is automatically turned and refracted according to the thickness of the laying iron plate (C). The clamp state as shown in (B) is avoided, and the hook (3) has a hole (C ₁ ) Can be rotated to a normal lifting position, and the state shown in FIG.
[0048]
As described with reference to FIGS. 12 to 14, the heavy load lifting hook (A) according to the present invention is configured so that when the operator hooks the hook (3) on the hole in the laid iron plate, The lifting operation can be performed safely even when hooked in any of the radial directions.
This point is greatly different from the hook device (B) previously proposed by the present inventors described with reference to FIGS.
[0049]
Further, in the lifting work of this type of laid iron plate, the use of a hook device without a detachment prevention device is prohibited, but it is actually used.
In addition, the mode of the use hooks a hook in the major axis direction of the hole of a laying iron plate from a workability viewpoint.
On the other hand, the hook device (A) of the present invention can be replaced with the hook device without the locking device because it can obtain the same workability as the hook device without the locking device as described above. In addition, high workability and safety can be obtained.
[0050]
【The invention's effect】
A hook device for lifting heavy objects such as a laid iron plate weighing several tons according to the present invention comprises a stopper for closing an opening of the hook during lifting of heavy objects, and the disconnection The stop portion is configured to bend and bend upward manually without being in contact with a heavy object suspended from the hook portion in conjunction with the rotation of the hook support.
For this reason, the hook device for lifting heavy objects of the present invention is
(i) A hook device having a drop-off prevention portion formed integrally with the hook support previously proposed by the present inventors (see Japanese Patent Application Nos. 3-53112 and 3-216524), or
(ii) A conventional hook device without a locking device,
Compared to the above, it is excellent in operability and safety.
[Brief description of the drawings]
FIG. 1 is a front view of a hook device (A) according to a first embodiment of the present invention.
FIG. 2 is a perspective view of a hook device (A) according to a first embodiment of the present invention.
FIG. 3 is a cross-sectional view of the hook device (A) according to the first embodiment of the present invention.
FIG. 4 is a sectional view of the hook device (A) according to the first embodiment of the present invention, and is a view for explaining the operation of the detachment preventing portion (4) by manual operation.
FIG. 5 is a sectional view of the hook device (A) according to the first embodiment of the present invention, and is a view for explaining the operation of the detachment preventing portion (4) due to the turning operation of the hook support (1).
6 is a cross-sectional view of a hook device (A) according to a second embodiment of the present invention, corresponding to FIG.
FIG. 7 is a view for explaining the installation work of a laying iron plate (C) by a conventional hook device (B) integrated with a drop-off prevention part (4 ′).
FIG. 8 is a view for explaining the installation work of the laid iron plate (C) by the hook device (A) of the present invention, and corresponds to FIG. 7;
FIG. 9 is a diagram for explaining a lifting operation of a laying iron plate (C) by a conventional hook device (B) with a drop-off prevention unit (4 ′), showing an initial state of lifting.
FIG. 10 is a diagram for explaining a lifting operation of the iron plate (C) by a conventional hook device (B) integrated with a drop-off prevention part (4 ′), and shows a state during lifting and conveying.
11 is a cross-sectional view taken along the line II of FIG.
FIG. 12 is a view for explaining the lifting work of the laying iron plate (C) by the hook device (A) of the present invention, and shows a state of the initial lifting corresponding to FIG. 9;
FIG. 13 is a diagram for explaining the lifting work of the laying iron plate (C) by the hook device (A) of the present invention. ₁ FIG.
FIG. 14 is a diagram for explaining the lifting work of the laying iron plate (C) by the hook device (A) of the present invention, and shows that the hook (3) at the initial stage of lifting is returned from the position of FIG. 13 to the normal position. It is.
[Explanation of symbols]
A ......... Hook device of the present invention
1 ......... Hook support
11 ………… The tip
12 ………… Wire fixing part
11a ......... Locking protrusion
2 …………… Joint Pin
3 ......... Hook
31 ………… The tip
32, 32 '......... (rear end)
33 …… Back
3a ............ Opening
4 ......... Release prevention part
41 ………… Occlusion piece
42 ………… Occlusion piece upper stage support arm
43 ………… Closed lower support arm
41a ......... tip
41b ......... Rear end
41c ......... intermediate part
42a ......... intermediate part
42b ......... tip
42c: Rear end (operating lever)
42d ......... Lock recess
43a ......... Rear end
43b ......... Tip
5 ......... Extraction lock
51 ………… Lock body for removal
52 ………… Locking part
B ......... Conventional hook device
4 '………… Integral drop-off prevention part of conventional hook device
C ......... Plate iron plate
C ₁ ………… Hooks for the iron plate
D ......... the ground
E ......... Structure

Claims (5)

A hook device (A) that is attached to the tip of a wire of a lifting device and lifts a heavy object, wherein the hook device (A) includes:
(i) A hook having a tip end portion (11) rotatably joined to the hook (3) at one end and a wire fixing portion (12) for fixing a wire from the lifting device to the other end. Support (1),
(ii). A hook (3) comprising a hook-shaped tip portion (31) and a rear end portion (32, 32 ') of a bifurcated structure, between the rear end portion (32, 32') of the bifurcated structure A hook (3) that rotatably joins the front end portion (11) of the hook support (1) into the space of the rear end portion (32, 32 ') via a joint pin (2) exaggerated on ),
(iii) A detachment preventing portion (4) for closing the opening (3a) of the hook (3) when lifting a heavy load to prevent the heavy load from coming off the hook tip (31). Stop (4)
(iii) -1.The tip (41a) is disposed so as to substantially contact the hook tip (31) of the hook (3), and the rear end (41b) is a bifurcated structure of the hook (3). A closing piece (41) arranged in the vicinity of the rear end (32, 32 ′),
(iii) -2. For a closing piece arranged at the lower part of the tip end portion (11) of the hook support (1) in the space of the rear end portion (32, 32 ') of the bifurcated structure of the hook (3) An upper support arm (42),
The intermediate part (42a) is joined so as to be rotatable in the space of the rear end part (32, 32 ') of the bifurcated structure,
The front end portion (42b) is rotatably joined to the rear end portion (41b) of the closing piece (41), and
Its After the end (42c) hook support (1) is a hook (3) of the back (33) closed for the upper support arm (42) operating lever for rotating the guide in the same direction when rotating in the direction of Configured to be
(iii) -3. A closing piece lower stage support arm (disposed in the lower part of the closing upper stage support arm (42) in the space of the rear end (32, 32 ') of the bifurcated structure of the hook (3) ( 43)
The rear end (43a) is rotatably joined in the space of the rear end (32, 32 ') of the bifurcated structure, and
The tip (43b) is rotatably joined to the intermediate part (41c) of the closing piece (41),
(iii) -4. The upper support arm (42) for the closing piece and the lower support arm (43) for the closing piece are used when the hook support (1) rotates in the direction of the back (33) of the hook (3). The arms (42, 43) rotate in the same direction via the operation lever (42c), and the closing piece (41) is moved from the closing position of the hook opening (3a) to the opening position in conjunction with the rotation. Is to be displaced
A hook device for lifting heavy objects, comprising: The front end portion (11) of the hook support body (1) has a locking projection (11a) at the periphery thereof, and the upper support arm (42) for the closing piece locks the locking projection (11a). It has a concave portion for locking (42d), and the hook protrusion (11a) and the concave portion for locking (42a) are engaged with the hook support (1) to the back portion (33) of the hook (3). The heavy load lifting hook device according to claim 1, wherein rotation is prevented. The engagement between the locking projection (11a) and the locking recess (42d) is released by manual operation of the rear end (operation lever) (42c) of the upper support arm (42) for the closing piece. Item 3. A heavy equipment lifting hook device according to Item 2. The distal end portion (43b) of the lower support arm (43) for the closing piece is joined to the intermediate portion (41c) of the closing piece (41) by a joining pin (43b ′) so as to be rotatable, and the spring (43b ″). The weight lifting hook device according to claim 1, wherein the hook device is elastically biased so as to increase the closing force of the closing piece (41) through the hook. When the hook support (1) is in an arrangement relationship in which the hook support (1) substantially contacts the back (33) of the hook (3), and for removing the heavy object from the hook device (A) while maintaining the arrangement relationship. The lock (5) is composed of an extraction lock body (51) disposed on the hook support (1) side and a locking portion (52) disposed on the hook (3) side. The hook device for lifting heavy objects according to claim 1.

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