JP3621767B2 - Lifting hook device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lifting hook device used when lifting heavy objects such as iron plates and block bodies.
[0002]
[Prior art]
Conventionally, in a construction site or the like, when a workpiece having a weight such as an iron plate or a block body is lifted and transported by a crane, a lifting hook device (hereinafter referred to as a drop-off preventing function) has been provided to ensure the safety of transporting work. The work is carried using a hook device.
[0003]
As this type of hook device, for example, the upper end of the hook is rotatably supported in the middle part of the hook support body having a wire fixing portion for locking the wire of the crane at the upper end, and the tip of the hook and the hook support body are There has been proposed a hook device that can maintain the closed state by preventing the relative rotation of the hook support and the hook in the closed state of the hook device in contact with the tip (Japanese Patent Laid-Open No. 6-92587). ).
[0004]
In this hook device, the hook is inserted into a perforated portion formed at the end of the iron plate or the like to lock the hook to the iron plate or the like, and the hook device is closed to prevent relative rotation of the hook support and the hook. This reliably prevents the workpiece from falling off the hook device being conveyed.
[0005]
The hook device further includes a locking piece rotatably supported in the vicinity of the wire fixing portion of the hook support, and a hooked portion that can be engaged with the locking piece is provided on the hook. By rotating the hook approximately 180 ° from the closed state of the hook device and engaging the locking piece with the locked portion in the opened state of the hook device in which the back portion of the hook is in contact with the hook support. The open state of the hook device can be maintained. In other words, after the workpiece is conveyed, the hook device is kept open and the hook device is lifted by a crane, so that the hook device can be easily removed from the workpiece.
[0006]
[Problems to be solved by the invention]
However, in the above conventional hook device, in the work of removing the hook device from the work, first, the release lever is operated to release the hook device from the closed state, and the hook device is rotated approximately 180 ° to open the hook device. The holding piece needs to be rotated and engaged with the locked part while holding, and in order to hold the hook device in an open state, operation of the release lever and operation of the locking piece are required, and operability is improved. Not necessarily good. Further, in the conventional hook device, the engaging piece is pivotally supported on the side portion of the hook support so that the locking piece swings during the operation, which disturbs the work. There is also complexity. Therefore, improvement of these points is desired.
[0007]
The present invention has been made to solve the above-described problems, and an object thereof is to provide a lifting hook device that can improve workability better.
[0008]
[Means for Solving the Problems]
A lifting hook device according to claim 1 includes a hook support body having a wire fixing portion at a rear end, a hook whose rear end is rotatably supported by an intermediate portion of the hook support body, and the hook support body. And a restricting means for restricting relative rotation around the support shaft of the hook, wherein the restricting means is pivotally supported by the hook so as to be swingable, and has an engaging member having two engaging portions. An arc-shaped sliding contact portion formed around the support shaft of the hook support body and capable of sliding contact with the engagement member in accordance with relative rotation of the hook support body and the hook, and provided at the sliding contact portion. A first engaged portion that engages with one engagement portion of the engagement member in a closed state of the hook device in which the hook support is brought into contact with the tip of the hook support to prevent relative rotation of the hook and the hook support. And between the support shaft of the hook support and the wire fixing portion. The hook member is engaged with the other engagement portion of the engagement member, and the hook device and the hook support member are spaced apart from each other. A second engaged portion to be blocked, and formed on the hook support, and engaged with any one of the engaging portions in the state between the closed state and the open state, and A third engaged portion that inhibits only relative rotation of the hook and the hook support in the opening state, and a direction in which the engaging portions of the engaging member and the engaged portions are engaged with each other. And an urging means for urging the engaging member.
[0009]
According to this hook device, the engaging member is swung to selectively engage the two engaging portions of the engaging member with respect to the first to third engaged portions provided on the hook support. As a result, the hook device is in a closed state, an open state, or a state between them, and a state in which the hook and the hook support are prevented from rotating relative to each other in the open state. For this reason, in a series of work transfer operations such as a work for locking the hook device with respect to the work and a work for removing the hook device from the work, the hook device is changed to each of the above states by a swinging operation of one member, that is, the engaging member. This makes it possible to improve the operability of the hook device.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings.
1 and 2 show an embodiment of a lifting hook device according to the present invention. As shown in these drawings, the lifting hook device 10 (hereinafter, abbreviated as the hook device 10) is provided with a hook support body having a wire fixing portion 16 for locking a crane wire or the like at the rear end (upper end). 12 and a hook 14 rotatably supported on an intermediate portion of the hook support 12.
[0011]
As shown in the figure, the hook 14 is integrally provided with a pair of fixing pieces 15a and 15b at its upper end. Then, with the hook support 12 interposed between the fixed pieces 15a and 15b, the shaft body 17 is inserted over the fixed pieces 15a and 15b and the hook support 12, so that the hook support 12, the hook 14 is rotatably connected. To be precise, the hook support 12 and the hook 14 are connected to the shaft 17 so as to be relatively rotatable.
[0012]
An engaging member 18 is disposed on the hook 14 at a position below the hook support 12 between the fixed pieces 15a and 15b. The engaging member 18 is a member having a locking claw 20 (one engaging portion) on an upper surface portion, and is attached to a shaft body 24 extending over the fixing pieces 15a and 15b. 24 is supported so as to be swingable around the shaft 24, and the locking claw 20 is pressed against the sliding contact portion 30 of the hook support 12 by the spring force of the torsion coil spring 28 inserted through the shaft body 24. Is being energized.
[0013]
As shown in FIG. 2, the distal end portion of the engagement member 18 (the right end portion in FIG. 2) extends outward from the hook 14 between the fixed pieces 15 a and 15 b, and the extended portion 22 A protrusion 22a (the other engaging portion) extending in the width direction of the hook 14 (direction orthogonal to the paper surface in FIG. 2) is provided. In this embodiment, the protrusion dimension of the protrusion 22a is set to be appropriately longer than the dimension of the hook support 12 in the width direction and does not protrude outside the fixed pieces 15a and 15b.
[0014]
On the other hand, a substantially arc-shaped sliding contact portion 30 centering on the shaft body 17 is formed integrally with the hook support body 12 at a connection portion with the hook 14.
[0015]
The sliding contact portion 30 is a portion where the engaging member 18 comes into sliding contact with the relative rotation of the hook support 12 and the hook 14, and a concave portion 32 (first cover) is formed on the peripheral surface thereof as shown in FIG. (Engagement part) is formed. The recess 32 is provided so that the locking claw 20 is interposed when the hook device 10 is in a closed state where the tip of the hook 14 and the tip of the hook support 12 are in contact, that is, the state shown by the solid line in FIG. In this way, the engaging claw 20 is interposed in the recess 32, so that the engaging claw 20 engages with the wall surface of the recess 32 to open the hook support 12 and the hook 14, that is, the hook 14. Relative rotation of the hook support 12 and the hook 14 in the direction in which the tip and the tip of the hook support 12 are separated from each other is prevented, whereby the hook device 10 is kept closed.
[0016]
Further, the hook support 12 is formed with a pair of protruding portions 34 on both sides in the width direction at a portion between the shaft body 17 and the wire fixing portion 16.
[0017]
As shown in FIG. 2, these projecting portions 34 are formed in a substantially mountain shape projecting leftward, and a concave portion 35 (second engaged portion) is formed on the upper surface portion, while the lower surface portion is formed. A contact portion 36 (third engaged portion) is formed.
[0018]
The contact portion 36 is a process of relatively rotating the hook 14 and the hook support 12 in the opening direction from the closed state, that is, the engagement member 18 is biased toward the sliding contact portion 30 by the torsion coil spring 28. When the hook 14 and the hook support 12 are rotated relative to each other in the opening direction in a state where the locking claw 20 is in contact with a portion other than the concave portion 32, the projection 22a of the engagement member 18 is contacted. In this way, when the abutting portion 36 abuts on the protrusion 22a, the hook support 12 and the hook 14 are more relative to each other in the opening direction (the state indicated by the two-dot chain line in FIG. 2). The rotation is prevented.
[0019]
On the other hand, the concave portion 35 is in an opened state of the hook device 10 (shown by a one-dot chain line in FIG. The projection 22a of the engaging member 18 can be interposed when the engagement member 18 is in the state), and the projection 22a is interposed in the recess 35 in this way, so that the closed direction (opposite to the opening direction) is formed. The hook device 12 and the hook 14 are prevented from rotating relative to each other in the direction, so that the hook device 10 is kept open.
[0020]
In order to interpose the protrusion 22 a in the recess 35, the engaging member 18 is moved farthest from the sliding contact portion 30 (position indicated by a one-dot chain line in FIG. 2), and the contact portion 36 is in contact with the protrusion 22 a of the engaging member 18. In this state, the hook device 10 is opened, and the engaging member 18 is swung so that the protrusion 22a is interposed in the recess 35. Here, the concave portion 35 is formed on the swing locus of the protrusion 22a in the opened state of the hook device 10, and accordingly, the engagement member 18 is swung according to the biasing force of the torsion coil spring 28. Along with this, the protrusion 22a can naturally intervene in the recess 35.
[0021]
Next, the effect of the hook apparatus 10 comprised as mentioned above is demonstrated using FIGS.
[0022]
When the workpiece B such as an iron plate is lifted and transported using the hook device 10, first, the hook device 10 is secured to the wire fixing portion 16 via a shackle or the like to lock the hook device 10 to the wire W. Attach to.
[0023]
Then, the engaging member 18 is swung through the extended portion 22, and for example, as shown in FIG. 3, the hook device 10 so that the contact portion 36 of the protruding portion 34 contacts the protrusion 22 a of the engaging member 18. In this state, the hook 14 is inserted between the workpiece B and the ground while the tip of the hook 14 is inserted into the punched portion Ba of the workpiece B. Thereby, the preparation for lifting the workpiece B by the hook device 10 is completed.
[0024]
At this time, even if the hook support 12 rotates in the opening direction with respect to the hook 14 due to the weight of the wire fixing portion 16 or the weight of the wire W or the shackle, the abutment portion 36 abuts on the protrusion 22a to support the hook. Since the relative rotation of the body 12 and the hook 14 in the opening direction is prevented, the protrusion 22a of the engaging member 18 is interposed in the recess 35 of the protruding portion 34, thereby unexpectedly holding the hook device 10 in the open state. There is no inconvenience.
[0025]
When the winding of the wire W is started by driving the crane, as shown in FIG. 4, the hook support 12 and the hook 14 are relatively rotated in the closing direction by the weight of the work B, and the work B is The hook 14 bites into the perforated part Ba as it rises vertically.
[0026]
When the workpiece B is completely lifted in this way, as shown in FIG. 5, the hook 14 is completely inserted into the perforated portion Ba of the workpiece B, and the locking claw 20 is interposed in the concave portion 32 of the sliding contact portion 30. As a result, relative rotation of the hook support 12 and the hook 14 in the opening direction is prevented, and the hook device 10 is kept closed. The workpiece B is lifted and conveyed by the crane while the hook device 10 is maintained in the closed state as described above, so that the workpiece B can be conveyed while being reliably prevented from falling off the hook 14. Done.
[0027]
Then, after the work B is transported to the target location, the work B is placed on the ground and the hook device 10 is detached from the work B, whereby the work work of transporting the work B using the hook device 10 is completed. In this case, the extension member 22 is pressed to swing the engaging member 18, and the hook 14 and the hook support 12 are thus moved relative to each other in the state where the locking claw 20 is separated from the sliding contact portion 30. After the rotation, the hook device 10 can be detached from the workpiece B by pulling the hook 14 out of the punched portion Ba of the workpiece B.
[0028]
However, when the work B is placed on the ground in a prone posture at the target location, as shown in FIG. 6, the lower part of the hook 14 is buried in the ground with the work B underlaying. Therefore, the hook device 10 may not be easily detached from the work B.
[0029]
In such a case, the engaging member 18 is swung by the pressing of the extended portion 22 so that the locking claw 20 is separated from the sliding contact portion 30. In this state, the hook 14 and the hook support 12 are moved. As shown in FIG. 7, the hook device 10 is set in the open state by interposing the protrusion 22a of the extended portion 22 in the recess 35 of the protruding portion 34, as shown in FIG. Then, the hook device 10 can be easily detached from the workpiece B by winding the wire W by driving the crane and pulling the hook device 10 upward.
[0030]
That is, when the hook device 10 is in the open state, the protrusion 22a of the protruding portion 22 is interposed in the recess 35 of the protruding portion 34 as described above, thereby preventing relative rotation of the hook support 12 and the hook 14 in the closing direction. Therefore, when the hook device 10 is pulled up, the entire hook device 10 rotates as indicated by an arrow in the figure, whereby the hook 14 is pulled out from the punched portion Ba of the workpiece B.
[0031]
In this way, by removing the hook device 10 from the work B by the power of the crane used for transporting the work B, the hook device 10 can be easily attached to the work even in the situation described above, which is difficult to remove by the operator's force. Can be removed from B.
[0032]
As described above, according to the hook device 10 described above, the engaging member 18 is swung through the extended portion 22 to engage with the recess 32 provided in the sliding contact portion 30 of the hook support 12. The engaging claw 20 of the coupling member 18 is interposed, the protrusion 22a of the engaging member 18 is interposed in the recess 35 formed in the protruding portion 34 of the hook support 12, and the contact portion formed in the protruding portion 34 36, the hook device 10 is selectively closed, opened, or a state between the hook device 10 and the hook support 12 in the opening direction. It is possible to prevent relative rotation. Therefore, in a series of work transfer operations such as the operation of locking the hook device 10 with respect to the work and the operation of removing the hook device 10 from the work, the hook device 10 is simply moved by swinging the engaging member 18 via the extended portion 22. It is possible to switch to each of the above states.
[0033]
Therefore, when removing the hook device from the workpiece, the operability of the hook device 10 can be further improved as compared with the conventional hook device of this type that requires the operation of the release lever and the swinging operation of the locking piece. Thereby, workability | operativity of workpiece conveyance work can be improved.
[0034]
Moreover, since the engaging member 18 is urged by the torsion coil spring 28 and the recess 35 is formed integrally with the hook 14, a member for holding the hook device 10 in an open state is unexpected during operation. It does not get in the way of work by swinging. Therefore, the engagement piece for holding the hook device in the open state is pivotally supported on the side portion of the hook support pair so that the locking piece may be swung unexpectedly during the operation. Compared with this type of apparatus, the workability can be improved.
[0035]
The hook device 10 is an example of a lifting hook device according to the present invention, and its specific configuration can be appropriately changed without departing from the gist of the present invention.
[0036]
For example, the shape and position of the locking claw 20 or the protrusion 22a of the engaging member 18, or the engaged portion with respect to the locking claw 20 and the protrusion 22a, that is, the recess 32 formed in the sliding contact portion 30 Depending on the purpose of use of the hook device 10, the shape and forming position of the concave portion 35 and the abutting portion 36 formed in the protruding portion 34 may be a required closed state, an open state, or a state between them. What is necessary is just to select suitably so that the state which prevents the relative rotation of the hook 14 and the hook support body 12 to a direction may be obtained.
[0037]
In the hook device 10 of the above embodiment, the abutment portion 36 is formed in the protruding portion 34, and the abutment portion 36 abuts on the protrusion 22 a of the extended portion 22, thereby opening the hook support 12 and the hook 14. Relative rotation in the direction is prevented, but a protrusion is formed on the peripheral surface of the sliding contact portion 30, and this protrusion and engagement member are associated with relative rotation of the hook support 12 and the hook 14. You may comprise so that the relative rotation to the opening direction of the hook support body 12 and the hook 14 may be prevented, when the 18 latching claws 20 contact | abut.
[0038]
【The invention's effect】
As described above, according to the lifting hook device of the present invention, the engaging member is swung to selectively engage with the first to third engaged portions provided on the hook support. By engaging the two engaging portions of the joint member, the relative rotation of the hook and the hook support in the direction in which the hook device is in a closed state, an open state, or a state between them is opened is prevented. Since the restricting means for restricting the relative rotation of the hook support and the hook is configured so as to be in a state of being carried out, in a series of work conveying work such as the work of locking the hook device to the work and the work of removing the hook device from the work The hook device can be changed to the above states by operating one member, that is, the engaging member. Therefore, when removing the hook device from the workpiece, the operability is better than the conventional lifting hook device of this type, which requires the operation of the release lever and the swinging operation of the locking piece. Sexuality is enhanced.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an embodiment of a lifting hook device according to the present invention.
FIG. 2 is a cross-sectional view showing the hook device.
FIG. 3 is a schematic view showing a state in which the hook device is used (step of hooking a hook tip on a perforated portion of a workpiece)
FIG. 4 is a schematic view showing a usage state of the hook device (a state immediately after starting to lift a workpiece);
FIG. 5 is a schematic view showing a usage state of the hook device (a state in which a workpiece is completely lifted);
FIG. 6 is a schematic view showing a usage state of the hook device (a state where the work is placed on the ground after the work is conveyed).
FIG. 7 is a schematic view showing a usage state of the hook device (a state just before the hook device is removed from the workpiece);
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Lifting hook apparatus 12 Hook support body 14 Hook 16 Wire fixing part 17, 24 Shaft body 18 Engaging member 20 Locking claw 22 Extension part 22a Protrusion 28 Torsion coil spring 30 Sliding contact part 32, 35 Recess 34 Protrusion part 36 Contact part

Claims (1)

A hook support body having a wire fixing portion at the rear end, a hook whose rear end is rotatably supported by an intermediate portion of the hook support body, and relative rotation around the support shaft of the hook support body and the hook are restricted. In the hook device comprising the restricting means, the restricting means is pivotally supported by the hook so as to be swingable, and is formed around the support shaft of the hook support body and an engaging member having two engaging portions. And an arcuate sliding contact portion that can be brought into sliding contact with the engagement member in association with relative rotation of the hook support and the hook, and the hook contact and the hook support support are brought into contact with each other. A first engaged portion that engages with one engagement portion of the engagement member in a closed state of the hook device to prevent relative rotation of the hook and the hook support, and the support shaft and the wire of the hook support Provided at a portion between the fixed portion and the other of the engaging members. A second engaged portion that engages with the joint portion and prevents relative rotation of the hook and the hook support in an open state of the hook device in which the hook tip and the hook support tip are separated from each other; and the hook A hook formed on the support body and engaged with either one of the engagement members in the state between the closed state and the open state, and the hook support body in the open state. From a third engaged portion that prevents only relative rotation, and an urging means that urges the engaging member in a direction to engage each engaging portion and each engaged portion of the engaging member. A lifting hook device characterized by comprising:

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