WO2021006001A1 - Hook latch latching mechanism, and hook - Google Patents

Abstract

Provided are a hook latch latching mechanism and a hook that have a low number of components, are easy to manufacture, and have excellent operability.　This hook/latch latching mechanism 100 comprises a releasable stopper 60 that is turnably attached to a hook latch 30, the releasable stopper 60 being attached so as to be capable of turning from a first fallen position on the distal-end side of the hook latch or a second proximal-end-side fallen position on the turning-fulcrum side of the hook latch 30 to an upright position, a main deforming part 63 that undergoes the greatest elastic deformation during turning being provided to the releasable stopper 60, a deformation operation part 37 that causes the main deforming part 63 to undergo greater elastic deformation when the releasable stopper 60 is positioned at the upright position than when the releasable stopper 60 is positioned at the fallen position being provided to the hook latch 30, and an orientation transition part 37b that causes the releasable stopper 60 to transition to the fallen state due to restoring force from the main deformation part 64 when the releasable stopper 60 is positioned between the upright position and the fallen position being provided to the hook latch 30.

Description

Hook latch disengagement mechanism and hook

The present invention relates to a hook latch disengagement mechanism and a hook.

Generally, the hook is provided with a member called an arm-shaped hook latch, and the hook latch is urged in the closing direction by a spring or the like to prevent the wire rope or the like hooked on the hook from coming off. There is. However, when a part of the suspended load hung on the hook via the wire rope lands, the wire rope is not pulled downward by the load of the suspended load. Therefore, a part of the wire rope ring (eye) wraps around from the hook tip side to the outside, and when a load is applied to the part of the eye, the wire rope comes off, which is the "wisdom ring phenomenon" ("back slip phenomenon"). Also called.) May occur.

As a hook latch detachment prevention mechanism for preventing such a "wheel of wisdom phenomenon" from occurring, for example, the configurations disclosed in Patent Documents 1 to 3 are known. In Patent Document 1, in addition to the detachment prevention device (2), the detachment prevention device (6) is attached, and the detachment prevention device (6) is configured to cover while pressing the tip of the hook. There is.

Further, in Patent Document 2, a secondary stopper (3) is rotatably attached to the main stopper (2), and the secondary stopper (3) is attached to the tip of the hook by a secondary torsion spring (16). It is being urged toward the part. Further, in Patent Document 3, the guide rod (22) of the hook tip cover (9) covering the tip side of the crane hook (2) can be moved along the guide groove (15) of the stopper (7). Is disclosed.

Japanese Unexamined Patent Publication No. 2001-253679 Japanese Patent No. 6350732 Japanese Unexamined Patent Publication No. 2015-20897

By the way, the hook latch detachment prevention mechanism as disclosed in Patent Documents 1 to 3 has a complicated structure and poor operability. For example, in the configuration disclosed in Patent Document 1, a detachment preventive device (21) is attached so as to cover the detachment preventive device (9), and a spring (22) that gives an urging force to the detachment preventive device (21) is further attached. ing. Therefore, the number of parts is large and the structure is complicated. Also. When removing the wire rope hung on the hook, it is necessary to operate both the stopper (9) and the stopper (21), and the operability when removing the wire rope is poor.

Further, in the configuration disclosed in Patent Document 2, a secondary stopper (3) is rotatably attached to the main stopper (2), and the secondary stopper (3) is provided by a secondary torsion spring (16). It is urged toward the tip of the hook. Therefore, even in the configuration disclosed in Patent Document 2, the number of parts is large and the structure is complicated. Also. When hanging the wire rope on the hook, it is necessary to operate the secondary stopper (3) while resisting the urging force of the secondary torsion spring (16), so the operability when hanging the wire rope is poor. It has become.

Further, in the configuration disclosed in Patent Document 3, in addition to the guide groove (15), a convex portion for regulation (27) and a convex portion for posture stabilization (29) are provided in the stopper (7), and the hook tip cover (9) is provided. ), It is necessary to provide a guide rod (22) and an inner pin (28). Therefore, the structure is complicated. Further, in order for the stopper (7) to cover the hook tip or release the covering state, it is necessary to slide the hook tip cover (9), which is in a state of poor operability.

The present invention has been made based on the above circumstances, and an object of the present invention is to provide a hook latch disengagement mechanism and a hook having a small number of parts, a simple structure, and good operability. Is.

In order to solve the above problems, according to the first aspect of the present invention, a hook latch rotatably provided on the hook body and urged to close the hook opening is provided from the hook tip of the hook body. It is a hook latch disengagement mechanism that prevents the clutch from rotating apart, and is provided with a disengagement stopper that is formed of a springy member and is rotatably attached to the hook latch. It is rotatably attached to the clutch between the first overturning position away from the rotation fulcrum of the hook latch or the second overturning position on the rotation fulcrum side and the upright position, and is engaged / disengaged stopper. Is provided with a main deformation portion in which elastic deformation occurs with the rotation of the engagement / disengagement stopper, and the hook latch is provided with a hook latch when the engagement / disengagement stopper is located in the upright position, rather than in the overturned position. Also, a deformation action part that causes a large elastic deformation with respect to the main deformation part is provided, and the hook latch has a disengagement stopper between the standing position and the first overturning position, or between the standing position and the second. Provided is a hook latch disengagement prevention mechanism provided with a posture transition portion in which the engagement / disengagement stopper is shifted to the overturned position by a restoring force from the main deformed portion when the clutch is located between the overturned positions. To.

Further, another aspect of the present invention is that, in the above-described invention, the engaging / disengaging stopper is provided with a leg portion from the main deforming portion toward the hook latch, and the deforming acting portion presses the leg portion to form the leg. It is preferably an urging convex portion that elastically deforms the portion or the main deformed portion.

Further, another aspect of the present invention is that, in the above-described invention, the hook latch is provided with a pair of side walls facing each other, and the urging convex portion protrudes from each side wall, and the pair of legs. It is preferable that each portion is pressed by the urging convex portion.

Further, as another aspect of the present invention, in the above-described invention, the hook latch is provided with a pair of side walls facing each other and a top wall existing between the pair of side walls, and the top wall. Is provided with shaft protrusions for axially supporting the ends of the pair of legs protruding from the top wall, and the urging protrusions project from the respective shaft protrusions, and the pair It is preferable that the legs of the above are pressed by the urging protrusions, respectively.

Further, as for another aspect of the present invention, in the above-described invention, the hook latch is provided with a pair of side walls facing each other, and one side wall of the hook latch is provided with a first shaft hole. A second shaft hole is provided on the other side wall of the clutch, and the engagement / disengagement stopper has a first shaft portion inserted into the first shaft hole, a second shaft portion inserted into the second shaft hole, and a main deformation. When the hook latch is viewed from the side, the first leg portion connecting the portion and the first shaft portion and the second leg portion connecting the main deformed portion and the second shaft portion are provided. In addition, the axis connecting the center of the first shaft hole and the center of the second shaft hole intersects the stretching direction of the first leg and the stretching direction of the second leg when the main deformed portion is in contact with the tip of the hook. It is preferable that it is.

Further, another aspect of the present invention is that, in the above-described invention, the hook latch is provided with a pair of side walls facing each other, and one side wall and the other side wall of the hook latch have an elongated hole shape. A long hole for the shaft is provided, and the engagement / disengagement stopper has a first shaft portion to be inserted into the long hole for the shaft on one side wall, and a second shaft portion to be inserted into the long hole for the shaft on the other side wall. A first leg portion that connects the main deformed portion and the first shaft portion and a second leg portion that connects the main deformed portion and the second shaft portion are provided, and the hook latch is viewed from the side. At that time, it is preferable that the longitudinal direction of the long hole for the shaft intersects the extending direction of the first leg portion and the extending direction of the second leg portion in a state where the main deformed portion is in contact with the tip of the hook.

Further, as for another aspect of the present invention, in the above-mentioned invention, it is preferable that the main deformed portion is formed by winding the wire rod in a loop shape.

Further, in order to solve the above-mentioned problems, according to the second aspect of the present invention, the hook includes a hook main body and a hook latch rotatably provided on the hook main body, and the hook latch is a hook latch. It has a hook latch detachment prevention mechanism that prevents the hook body from rotating away from the hook tip, and the hook latch detachment prevention mechanism is formed of a springy member and is rotatably attached to the hook latch. The engagement / disengagement stopper is provided, and the engagement / disengagement stopper is between the first overturning position away from the rotation fulcrum of the hook latch or the second overturning position on the rotation fulcrum side and the upright position with respect to the hook latch. Is rotatably attached, the engagement / disengagement stopper is provided with a main deformation portion that elastically deforms with the rotation of the engagement / disengagement stopper, and the hook latch is provided with the engagement / disengagement stopper in an upright position. The hook latch is provided with a deforming action portion that causes a larger elastic deformation with respect to the main deforming portion than when it is located at the overturned position, and the hook latch has an engaging / disengaging stopper at the standing position and the first position. There is a posture transition part in which the engagement / disengagement stopper is shifted to the fall position by the restoring force from the main deformation part when it is located between the overturned position or between the standing position and the second overturned position. A hook featuring the above is provided.

According to the present invention, it is possible to provide a hook latch disengagement prevention mechanism and a hook having a small number of parts, a simple structure, and good operability.

It is a side view which shows the structure of the hook which concerns on 1st Embodiment of this invention. It is a side view which shows the structure of the hook latch provided in the hook shown in FIG. It is a perspective view which shows the structure of the hook latch in the state which the engaging / disengaging spring is attached according to the 1st Embodiment of this invention. It is a top view which shows the structure of the hook latch shown in FIG. It is a front view which shows the structure of the hook latch shown in FIG. It is a top view which shows the structure of the engagement / disengagement spring provided in the hook shown in FIG. FIG. 5 is a side view showing a state in which the engaging / disengaging spring is located at an upright position rotated clockwise from the locking position shown in FIG. It is a figure which shows the state which the engaging / disengagement spring is located at the release position which rotated clockwise from the standing position shown in FIG. It is a perspective view which shows the structure of the hook latch in the state which the engaging / disengaging spring is attached according to the 2nd Embodiment of this invention. It is a top view which shows the structure of the hook latch shown in FIG. It is sectional drawing which shows the state which cut the hook latch along the width direction in the vicinity of the opening of FIG. It is a side view which shows the structure of the hook which concerns on 3rd Embodiment of this invention. It is a side view which shows the structure of the hook latch which concerns on 3rd Embodiment of this invention, (A) shows the shape seen from the side wall side, (B) shows the shape seen from the side wall side. It is a top view which shows the structure of the engagement spring which concerns on 3rd Embodiment of this invention. It is a figure which shows the positional relationship of the 1st shaft part and 2nd shaft part at the time of the state which the engaging / disengaging spring is positioned at the locking position as shown in FIG. It is a figure which shows the positional relationship of the 1st shaft part and 2nd shaft part at the time of the state which the engaging / disengaging spring is located in the standing (neutral) position. It is a top view which shows the shape of the engaging / disengaging spring when the engaging / disengaging spring is in the standing (neutral) position. It is a side view which shows the hook latch which concerns on the modification of this invention.

[First Embodiment]
Hereinafter, the hook 10 including the hook latch disengagement prevention mechanism 100 and the hook latch disengagement prevention mechanism 100 according to the first embodiment of the present invention will be described with reference to the drawings. In the following description, the Z direction refers to the direction in which the hook 10 is suspended, the Z1 side refers to the upper side in the suspension direction of the hook 10, and the Z2 side refers to the upper side in the suspension direction of the hook 10. .. Further, the X direction refers to a direction perpendicular to the Z direction from the hook tip 22 toward the closed space S1 (left-right direction in FIG. 1), the X1 side refers to the right side in FIG. 1, and the X2 side is a diagram. Refers to the left side in 1. Further, the Y direction refers to a direction perpendicular to the Z direction and the X direction, the Y1 side refers to the side where the side wall 32 is located with respect to the side wall 33 (left side in FIG. 3), and the Y2 side refers to the side wall 32. On the other hand, it refers to the side where the side wall 33 is located (the right side in FIG. 3).

<About the configuration of the hook 10 and the hook latch detachment prevention mechanism 100>
FIG. 1 is a side view showing the configuration of the hook 10 according to the first embodiment of the present invention. As shown in FIG. 1, the hook 10 includes a hook main body 20, a hook latch 30, a rotating shaft 40, a latch urging spring 50, and a engaging / disengaging spring 60.

The hook body 20 is a member for loading a load made of a metal such as steel. An attachment hole 21 for attaching to a separate member is provided on the upper side (Z1 side) of the hook body 20. Further, the shape of the hook body 20 on the lower side (Z2 side) of the mounting hole 21 is a hook that goes diagonally upward after passing through the lower end side located diagonally lower than the mounting hole 21 and reaches the hook tip 22. It is provided in the shape.

Such a hook body 20 is provided with a shaft hole 23 into which the rotating shaft 40 is inserted, and a hook latch 30 is attached via the rotating shaft 40 inserted into the shaft hole 23. Further, in the vicinity of the hook tip 22 of the hook body 20, a movement blocking wall 24 for receiving the tip 35 of the hook latch 30, which will be described later, is also provided. The movement blocking wall 24 is a rising wall surface that appears by cutting out a part of the hook main body 20. Although the rotation shaft 40 corresponds to the rotation fulcrum, the shaft hole 23 may correspond to the rotation fulcrum.

Next, the hook latch 30 will be described. As shown in FIG. 1, the hook latch 30 is a portion that forms a closed space S1 with the hook main body 20. When a part of the wire rope loop (eye) is located in the closed space S1, even if the wire rope moves to the hook latch 30 side, the tip portion 35 of the hook latch 30 exists on the tip side of the hook body 20. By colliding with the movement blocking wall 24, a part of the wire rope ring (eye) is prevented from coming out of the closed space S1.

FIG. 2 is a side view showing the configuration of the hook clutch 30 included in the hook 10. FIG. 2A shows a shape seen from the side wall 32 side, and FIG. 2B shows a shape seen from the side wall 33 side. As shown in FIG. 2, the hook latch 30 has a top wall 31 and a pair of side walls 32 and 33. The top wall 31 is a portion facing the outside on the side opposite to the closed space S1. Further, the side wall 32 is a wall surface that faces the closed space S1 side from one edge portion in the width direction of the top wall 31. Further, the side wall 33 is a wall surface facing the closed space S1 side from the other edge portion in the width direction of the top wall 31, and faces the side wall 32.

The hook latch 30 is provided in a hollow shape between the pair of side walls 32 and 33 by bending the plate member into a U shape (U shape). However, the hook latch 30 may be a solid member between the pair of side walls 32 and 33. When the space between the pair of side walls 32 and 33 is provided in a hollow shape, the latch urging spring 50 can be easily arranged in the hollow portion. On the other hand, when the space between the pair of side walls 32 and 33 is provided solidly, the shaft hole 36 described later can be formed long, and the leg portion 63 of the engagement / disengagement spring 60 described later can be inserted long.

Of the hook latch 30, one side in the longitudinal direction is provided with a shaft support hole 34 that penetrates the pair of side walls 32 and the side wall 33 on the coaxial line in the width direction. The above-mentioned rotating shaft 40 is inserted into the shaft support hole 34. As a result, the hook latch 30 rotates with the shaft support hole 34 and the rotation shaft 40 as fulcrums.

Further, the latch urging spring 50 is arranged in the internal space P1 (see FIG. 3) on the inner side surrounded by the top wall 31 of the hook latch 30 and the pair of side walls 32 and 33. The latch urging spring 50 is a spring that applies an urging force such that the hook latch 30 faces the movement blocking wall 24 with the rotation shaft 40 (shaft support hole 34) as a fulcrum. Examples of the latch urging spring 50 include a torsion coil spring, but a spring other than the torsion coil spring may be used. By applying such an urging force to the hook latch 30 by the latch urging spring 50, it is possible to maintain a state in which the tip portion 35 of the top wall 31 of the hook latch 30 collides with the movement blocking wall 24.

Further, of the pair of side walls 32 and 33 of the hook latch 30, shaft holes 36 are provided at positions facing the tip end side of the hook latch 30 from the shaft support hole 34, respectively. The shaft hole 36, together with the engagement / disengagement spring 60 described later, constitutes the hook latch disengagement prevention mechanism 100. The shaft hole 36 of the side wall 32 and the shaft hole 36 of the side wall 33 are located on the same straight line in the width direction (Y direction).

FIG. 3 is a perspective view showing the configuration of the hook latch 30 with the engagement / disengagement spring 60 attached. FIG. 4 is a plan view showing the configuration of the hook latch 30. FIG. 5 is a front view showing the configuration of the hook clutch 30. As shown in FIGS. 3 to 5, the hook latch 30 is provided with a spring-loaded urging convex portion 37. The spring-armed convex portion 37 is a portion that overhangs the other portion of the hook latch 30 in the width direction of the hook latch 30. Specifically, the spring-loaded convex portion 37 is a portion that protrudes in a direction away from the surfaces of the side walls 32 and 33. The spring-loaded convex portion 37 projects outward on the side opposite to the internal space P1. Further, the spring-loaded urging convex portion 37 corresponds to the deformation acting portion.

Here, the spring-loaded urging convex portion 37 is provided with a top portion 37a and an inclined portion 37b. The top portion 37a is a portion provided horizontally with respect to the longitudinal direction of the hook latch 30. Therefore, when the leg portion 63, which will be described later, is in contact with (riding on) the top portion 37a, the leg portion 63 is in contact with the top portion 37a even if the hand holding the leg portion 63 is released. It is possible to maintain the state.

Further, unlike the top portion 37a, the inclined portion 37b is a portion provided so as to be inclined with respect to the longitudinal direction of the hook latch 30. Therefore, when the hand holding the leg 63 is released while the leg 63, which will be described later, is in contact with the inclined portion 37b, the tip contact portion 64 tries to return to the original state (a pair of restoring forces). The leg 63 moves toward the base side of the inclined portion 37b due to the action of the urging force in the direction of closing the leg 63. The inclined portion 37b corresponds to the posture transition portion.

Next, the engagement / despring 60 will be described. FIG. 6 is a plan view showing the configuration of the engagement / disengagement spring 60. The engagement / disengagement spring 60 corresponds to the engagement / disengagement stopper. As shown in FIG. 1, the engagement / disengagement spring 60 is a member that rotates with respect to the hook latch 30 with the shaft hole 36 as a fulcrum. The pair of leg portions 63 (described later) of the engagement / disengagement spring 60 are configured to exert urging forces in a direction to close each other. That is, when the engagement / disengagement spring 60 is removed from the hook latch 30, the shaft portions 61 side of the pair of leg portions 63 are provided so as to approach each other (close to each other) as shown by the alternate long and short dash line in FIG. .. On the other hand, when the shaft portion 61 is inserted into the shaft hole 36 of the hook latch 30, it is in the state shown by the solid line in FIG. Further, since the pair of legs 63 exert a urging force in the direction of closing each other by being deformed from the two-dot chain line as shown by the solid line in FIG. 6, the top portion 37a of the spring urging convex portion 37 is formed by the pair of legs. When the part 63 gets over it, a larger urging force is generated.

On one end side of the rotation of the engagement / disengagement spring 60, the engagement / disengagement spring 60 is locked to the hook tip 22. In this locked state, the wire rope loop (eye) is difficult to enter the gap S2 (see FIGS. 4 and 5) between the hook tip 22 and the hook latch 30. That is, the engagement / disengagement spring 60 is a member that prevents the ring (eye) of the wire rope from entering the gap S2. On the other hand, on the other end side of the rotation of the engagement / disengagement spring 60, the engagement / disengagement spring 60 comes into contact with the vicinity of the mounting hole 21 of the hook 10.

The engagement / disengagement spring 60 shown in FIGS. 3 and 6 is formed of a springy material. In the present embodiment, the engagement / disengagement spring 60 is formed of a wire rod 60a, and examples of the wire rod 60a having a spring property include hard steel wire, piano wire, and linear stainless steel for spring. It may be formed from other materials.

This engagement / disengagement spring 60 has a pair of shaft portions 61. The pair of shaft portions 61 is a portion to be inserted into the shaft hole 36 of the hook latch 30, and the engaging / disengaging spring 60 can rotate around the shaft portion 61 (shaft hole 36) as a fulcrum. The length of the shaft portion 61 is provided to be sufficiently longer than the penetration depth of the shaft hole 36 so that the shaft portion 61 can slide along the shaft hole 36. As a result, when the leg 63 gets over the spring-loaded convex portion 37, the leg 63 is prevented from coming out of the shaft hole 36. However, when the urging force in the direction of closing the pair of legs 63 is very large, the length of the shaft portion 61 may be about the same as the depth of the shaft hole 36, and the length of the shaft portion 61 is the shaft. It may be shorter than the hole 36. Further, when the penetration depth of the shaft hole 36 is sufficiently deep regardless of the urging force in the direction of closing the pair of leg portions 63, the length of the shaft portion 61 is about the same as the depth of the shaft hole 36. The length of the shaft portion 61 may be shorter than that of the shaft hole 36.

The engagement / disengagement spring 60 may be provided with a retaining portion for preventing the shaft portion 61 from coming out of the shaft hole 36. In this case, the retaining portion may be configured to extend in the bent direction so as to be substantially perpendicular to the shaft portion 61, for example, but the shaft portion 61 is prevented from coming out of the shaft hole 36. If there is, the retaining portion does not have to extend substantially perpendicular to the shaft portion 61.

Further, the engagement / disengagement spring 60 is provided with a pair of leg portions 63. One end side (base end side) of the leg portion 63 is provided so as to be continuous with the shaft portion 61. Further, the other end side (side tip side) of the leg portion 63 is provided so as to be continuous with the tip contact portion 64 described later.

The leg portion 63 is a portion that comes into contact with the spring-loaded urging convex portion 37 in the middle portion thereof. Here, as shown in FIG. 3, the leg portion 63 is in contact with the spring-loaded urging convex portion 37 at a portion closer to the shaft portion 61. In particular, when the pair of leg portions 63 are separated from each other (open) over the spring-urged convex portion 37, the leg portion 63 passes through the apex portion of the spring-urged convex portion 37. Then, when the leg portion 63 passes through the apex portion of the spring urging convex portion 37, the engagement / disengagement spring 60 is elastically deformed so that the distance between the pair of leg portions 63 is widest.

The leg portion 63 is a portion that can be flexed and deformed with the tip contact portion 64 side (base side; base end side) as a fulcrum. Further, the pair of legs 63 are portions that give urging forces in a direction to close each other. That is, as shown in FIG. 6, in the state after the shaft portion 61 is inserted into the shaft hole 36 (the state shown by the solid line), the state before the shaft portion 61 is inserted into the shaft hole 36 (two-dot broken line). Compared with the state shown), the pair of legs 63 are deformed so as to open each other. Then, due to this deformation, the pair of legs 63 are given urging forces in the directions of closing each other.

In addition, when the retaining portion is provided so as to be continuous with the shaft portion 61, the retaining portion is formed into a shape that can be elastically deformed (for example, a torsion spring shape, a coil spring shape, etc.) Elastic deformation of the retaining portion may be involved.

Further, as shown in FIGS. 3 and 6, the tip contact portion 64 is a portion continuous with the other end side of the pair of leg portions 63, and is a portion located between the pair of leg portions 63. .. The tip contact portion 64 is provided in a shape in which the central side in the width direction (Y direction) is curved toward the shaft portion 61 so as not to interfere with the hook tip 22 (see FIG. 1) of the hook body 20. .. The tip contact portion 64 is a portion where the pair of leg portions 63 mainly apply an urging force in a direction to close each other, and corresponds to a main deformed portion. That is, as shown in FIG. 6, in the state after the shaft portion 61 is inserted into the shaft hole 36 (the state shown by the solid line), the state before the shaft portion 61 is inserted into the shaft hole 36 (two-dot broken line). Compared with the state shown), the tip contact portion 64 is elastically deformed so as to have a larger curvature. Therefore, the tip contact portion 64 gives an urging force in the direction in which the pair of leg portions 63 are closed to each other. The tip contact portion 64 is curved so that the central side in the width direction (Y direction) faces the shaft portion 61 so as not to interfere with the hook tip 22 (see FIG. 1) of the hook main body 20.

Note that not only the tip contact portion 64 but also the leg portion 63 may correspond to the main deformed portion. Further, the elastic deformation such that the distance between the pair of legs 63 is widened may be realized by the bending deformation of the pair of legs 63, and is realized by the elastic deformation of the tip contact portion 64. May be done. Further, elastic deformation may be realized so that the distance between the pair of leg portions 63 is widened by both the bending deformation of the pair of leg portions 63 and the elastic deformation of the tip contact portion 64.

The tip contact portion 64 is not limited to the curved shape as shown in FIG. For example, the tip contact portion 64 may be provided in a shape in which a loop portion corresponding to the torsion spring exists.

<About action>
The operations of the hook 10 and the hook latch disengagement prevention mechanism 100 having the above configuration will be described below.

FIG. 7 is a side view showing the configuration of the hook 10 according to the embodiment of the present invention, and is a view showing a state in which the engagement / disengagement spring 60 is located in the upright position. FIG. 8 is a side view showing the configuration of the hook 10 according to the embodiment of the present invention, in which the engagement / disengagement spring 60 is located at a release position rotated clockwise from the standing position shown in FIG. It is a figure which shows.

As described above, the engagement / disengagement spring 60 is formed of a wire rod 60a having a spring property. Then, as shown in FIG. 1, the tip contact portion 64 of the engagement / disengagement spring 60 is located at a locking position (an example of a tipping position; a first tipping position) locked to the hook tip 22. At this time, the pair of leg portions 63 of the deengagement spring 60 are in contact with the intermediate portion of the inclined portion 37b instead of the top portion 37a of the spring urging convex portion 37, or the end side of the spring urging convex portion 37. (The end side is pushed in). Therefore, the engagement / disengagement spring 60 is given an urging force in the direction in which the tip contact portion 64 abuts on the hook tip 22. Therefore, the state in which the tip contact portion 64 is in contact with the hook tip 22 is maintained.

When the engaging / disengaging spring 60 is rotated to the upright position as shown in FIG. 7 from the state where the tip contact portion 64 is in contact with the hook tip 22, the pair of leg portions 63 are spring-loaded. It approaches the top portion 37a of the convex portion 37. Since the top portion 37a is not inclined with respect to the longitudinal direction of the hook latch 30 (see FIG. 4), the engagement / disengagement spring 60 is supported by hand or the like when the pair of legs 63 pushes the top portion 37a. The standing position shown in FIG. 7 can be maintained without it, or the urging force can be resisted with a light force. However, when the engagement / disengagement spring 60 is located at the upright position as shown in FIG. 7, the engagement / disengagement spring 60 opens the pair of legs 63 most widely and the curvature of the tip contact portion 64 becomes the largest. It is elastically deformed.

From such a state shown in FIG. 7, the engagement / disengagement spring 60 is slightly rotated clockwise in FIG. Then, since the pair of leg portions 63 pushes the inclined portion 37b of the spring urging convex portion 37, the engagement / disengagement spring 60 is further increased by the urging force for canceling the open state of the pair of leg portions 63 so as to be separated from each other. Rotates clockwise, thereby engaging up to the release position as shown in FIG. 8 (position on the side opposite to the hook tip 22 (Z1 side; upper side); an example of a fall position; a second fall position). The despring 60 rotates. Then, unless a force is applied to the engagement / disengagement spring 60, the top portion 37a cannot be overcome, so that the engagement / disengagement spring 60 is maintained in the released position.

Here, the standing position corresponds to the case where the leg portion 63 is in contact with the top portion 37a (when it is pushed in), but even in other cases, the engagement / disengagement spring 60 cannot be supported by a hand or the like. Also applies when the standing posture as shown in FIG. 7 can be maintained. Further, the standing position may refer to the position between the first fall position and the second fall position described above.

Even when the engagement / disengagement spring 60 is slightly counterclockwise from the state where the engagement / disengagement spring 60 is located at the upright position as shown in FIG. 7, the pair of legs 63 are spring-loaded and convex. Since it comes into contact with the inclined portion 37b of the portion 37, the engagement / disengagement spring 60 rotates counterclockwise from the position shown in FIG. 7 by the urging force for canceling the open state in which the pair of leg portions 63 are separated from each other. As a result, the engaging / disengaging spring 60 rotates to a locking position where the tip contact portion 64 abuts on the hook tip 22 as shown in FIG. Then, unless a force is applied to the engaging / disengaging spring 60, the top portion 37a cannot be overcome, so that the engaging / disengaging spring 60 is maintained in the locked position.

<About the effect>
The hook 10 and the hook latch disengagement prevention mechanism 100 having the above configuration are formed of a member having a spring property (wire material 60a) and are rotatably attached to the hook latch 30 (engagement / disengagement stopper). The engagement / disengagement spring 60 (engagement / disengagement stopper) is provided with respect to the hook latch 30 at a tipping position (first overturning position) on the tip side away from the rotation fulcrum (rotation shaft 40) of the hook latch 30. Alternatively, it is rotatably attached between the tipping position (second tipping position) on the base end side, which is the rotation fulcrum side (rotating shaft 40 side), and the standing position, and the engaging / disengaging spring 60 (engaging / disengaging stopper). ) Is provided with a leg portion 63 (main deformation portion) in which the largest elastic deformation occurs when the engagement / disengagement spring 60 (engagement / disengagement stopper) rotates. Further, in the hook latch 30, when the engagement / disengagement spring 60 (engagement / disengagement stopper) is located in the upright position, the leg portion 63 (main deformed portion) is in the hook latch 30 than when it is located in the first overturning position or the second overturning position. ) Is provided with a spring-loaded urging convex portion 37 (deformation acting portion) that causes a large elastic deformation. Further, when the engagement / disengagement spring 60 (engagement / disengagement stopper) is located between the standing position and the overturning position (locking position (first overturning position) or releasing position (second overturning position)) on the hook latch 30. In addition, the engagement / disengagement spring 60 (engagement / disengagement stopper) shifts from the leg portion 63 (main deformed portion) to the overturning position (locking position (first overturning position) or releasing position (second overturning position)) due to the restoring force. An inclined portion 37b (posture transition portion) to be made to be made is provided.

Therefore, when the tip contact portion 64 (engagement / disengagement stopper) is located at the locking position, the wire rope ring (eye) moves along the engagement / disengagement spring 60, so that the hook tip 22 and the hook latch 30 It is possible to prevent the loop (eye) of the wire rope from entering the gap S2 between them. Further, as described above, the hook latch disengagement prevention mechanism 100 is provided by providing the shaft hole 36 in the hook latch 30 having the same shape as that of the current hook and further attaching the engagement / disengagement spring 60 (engagement / disengagement stopper). Can be configured. Therefore, the number of parts is small and the structure can be simplified.

Further, when the pair of leg portions 63 are in contact with the top portion 37a of the spring-armed convex portion 37 (deformation action portion), the engagement / disengagement spring 60 (engagement / disengagement stopper) stands up (neutral) as shown in FIG. Although it is located at the position, when it is slightly rotated from the standing (neutral) position to the hook tip 22 side, the pair of leg portions 63 abut on the inclined portion 37b. At this time, the restoring force from the leg portion 63 (main deformed portion) can rotate the engaging / disengaging spring 60 (engaging / disengaging stopper) toward the locking position, and the tip contact portion with the hook tip 22. 64 can be locked. Moreover, as long as the pair of legs 63 does not get over the top portion 37a, the engagement / disengagement spring 60 (engagement / disengagement stopper) can be maintained in the locked position.

Further, by rotating the engagement / disengagement spring 60 from the standing (neutral) position shown in FIG. 7 to the release position shown in FIG. 8, the tip contact portion 64 is on the opposite side (Z1 side; upper side; The released state located on the base end side) can be maintained. Even at this time, as long as the pair of legs 63 does not get over the top portion 37a, the engagement / disengagement spring 60 (engagement / disengagement stopper) can be maintained in the released position.

Further, in the present embodiment, the engagement / disengagement spring 60 (engagement / disengagement stopper) is provided with a leg portion 63 from the tip contact portion 64 (main deformation portion) to the hook latch 30. The leg portion 63 is pressed to elastically deform the leg portion 63 or the tip contact portion 64 (main deformed portion) as a spring-biased convex portion 37 (biased convex portion).

Therefore, when the top portion 37a of the spring urging convex portion 37 (urging convex portion) is overcome, the pair of leg portions 63 are greatly elastically deformed so as to open each other. Therefore, although the engagement / disengagement spring 60 (engagement / disengagement stopper) has a simple structure, a relatively large urging force can be generated when the top portion 37a is overcome. Therefore, it is clarified that the engagement / disengagement spring 60 (engagement / disengagement stopper) is switched between the locking position and the standing (neutral) position. Therefore, it is possible to prevent the engagement / disengagement spring 60 (engagement / disengagement stopper) from rotating from the locking position unintentionally.

Further, in the present embodiment, the hook latch 30 is provided with a pair of side walls 32 and 33 facing each other, and the spring urging convex portion 37 (urging convex portion) is provided with the side walls 32 and 33, respectively. The pair of leg portions 63 are pressed by the spring-armed convex portions 37 (biased convex portions), respectively.

Therefore, the pair of leg portions 63 are deformed so that the pair of leg portions 63 are opened to each other by the pair of leg portions 63 when the top portion 37a of the spring-urged convex portion 37 (the urging convex portion) is overcome. Can be done. Therefore, although the engagement / disengagement spring 60 (engagement / disengagement stopper) has a simple structure, the pair of legs 63 are oriented so as to close each other at the tip contact portion 64 (main deformed portion) when the top portion 37a is overcome. Great restoring force can be generated. Therefore, it is clarified that the engagement / disengagement spring 60 (engagement / disengagement stopper) is switched between the locking position and the standing (neutral) position. Therefore, it is possible to prevent the engagement / disengagement spring 60 (engagement / disengagement stopper) from rotating from the locking position unintentionally.

[Second Embodiment]
Hereinafter, the hook 10 provided with the hook latch detachment prevention mechanism 100B and the hook latch detachment prevention mechanism 100B according to the second embodiment of the present invention will be described with reference to the drawings. In the present embodiment, the same configuration as that of the first embodiment described above will be described with reference to the same reference numerals.

<About the configuration of the hook latch detachment prevention mechanism 100B>
In this embodiment, a hook latch disengagement prevention mechanism 100B different from that in the first embodiment is used. FIG. 9 is a perspective view showing the configuration of the hook latch 30B with the disengagement spring 60B attached. Further, FIG. 10 is a plan view showing the configuration of the hook latch 30B. FIG. 11 is a cross-sectional view showing a state in which the hook latch 30B is cut along the width direction in the vicinity of the opening 39B in FIG.

As shown in FIGS. 9 to 11, the hook latch 30B of the present embodiment has a top wall 31B similar to the top wall 31, side walls 32B and 33B similar to the side walls 32 and 33, and a shaft similar to the shaft support hole 34. It has a support hole 34B and a tip portion 35B similar to the tip portion 35. However, the hook latch 30B according to the present embodiment has a portion different from that of the hook latch 30 according to the first embodiment.

As shown in FIGS. 9 to 11, the hook latch 30B is provided with a pair of shaft protrusions 38B. The shaft protrusion 38B is a portion that protrudes in a direction away from the surface of the top wall 31B (direction opposite to the internal space P1). Further, a shaft hole 36B is provided so as to penetrate the shaft protrusion 38B. The shaft hole 36B is a portion into which the shaft portion 61B of the engagement / disengagement spring 60B is inserted.

Here, the protruding portion 38B for the shaft is provided with a spring-loaded urging convex portion 37B. The spring-biased convex portion 37B is a portion for urging the pair of leg portions 63B in a direction in which the distance between the pair of leg portions 63B is narrowed. Therefore, the spring-loaded convex portion 37B protrudes toward the center of the hook latch 30B in the width direction (Y direction).

Further, as shown in FIGS. 9 to 11, the top wall 31B is provided with an opening 39B. The opening 39B is a portion cut out from the top wall 31B in order to insert each shaft portion 61B into the shaft hole B36 without interfering with the top wall 31B.

Next, the deengagement spring 60B will be described. The engaging / disengaging spring 60B is different from the engaging / disengaging spring 60 described in the first embodiment, and the pair of leg portions 63B is a portion that gives an urging force in a direction to open each other.

<About action>
The operation of the hook 10 and the hook latch detachment prevention mechanism 100B having the above configuration will be described below.

Also in the present embodiment, when the tip contact portion 64B of the engagement / disengagement spring 60B is located at the locking position locked to the hook tip 22, the pair of leg portions 63B of the engagement / disengagement spring 60B are spring-loaded. It is in contact with the intermediate portion of the inclined portion 37Bb instead of the top portion 37Ba of the bulging portion 37B, or the end side of the spring-loaded urging convex portion 37B (the end side is pushed in). Here, since the pair of legs 63B give an urging force in a direction in which the distance between the legs 63B is widened, the pair of legs 63B do not try to move toward the top portion 37Ba of the spring urging convex portion 37B, but instead urge the spring. The state of being in contact with the end side of the convex portion 37B is maintained. Therefore, the engagement / disengagement spring 60B is given an urging force in the direction in which the tip contact portion 64B contacts the hook tip 22. Therefore, the state in which the tip contact portion 64B is in contact with the hook tip 22 is maintained.

When the engagement / disengagement spring 60 is rotated to the upright (neutral) position from the state where the tip contact portion 64B is in contact with the hook tip 22, the pair of leg portions 63B approaches the top portion 37Ba. However, at this time, each leg 63B is pushed by the spring-loaded convex portion 37B so that the distance between the pair of leg portions 63B is narrowed by the spring-loaded urging convex portion 37B. Then, when the pair of leg portions 63B is approaching the top portion 37Ba (when the engaging / disengaging spring 60B is present at the position corresponding to FIG. 8; when the engaging / disengaging spring 60B is located at the standing position), the pair of engaging / disengaging springs 60B are paired. The leg portion 63B is closed to the narrowest position, and the tip contact portion 64B or the pair of leg portions 63B is bent and deformed.

When the engagement / disengagement spring 60B is slightly rotated toward the side opposite to the hook tip 22 from the state of approaching the top portion, the pair of leg portions 63B abut on the inclined portion 37Bb of the spring urging convex portion 37B. .. Therefore, the engagement / disengagement spring 60B is further directed to the side opposite to the hook tip 22 (position corresponding to FIG. 8) by the urging force (restoring force) that cancels the closed state in which the pair of legs 63B are close to each other. And rotate. Then, unless a force toward the hook tip 22 is applied to the engagement / disengagement spring 60B, the top portion 37Ba cannot be overcome, so that the engagement / disengagement spring 60B is maintained in the released position.

Even when the engagement / disengagement spring 60B is slightly rotated toward the hook tip 22 side from the state where the pair of legs 63B is located at the upright position approaching the top portion 37Ba, the pair of legs 63B are springs. It abuts on the inclined portion 37Bb of the urging convex portion 37B. Therefore, the engagement / disengagement spring 60B further rotates toward the hook tip 22 side by the urging force that cancels the closed state in which the pair of leg portions 63B approach each other. Then, unless a force is applied to the engaging / disengaging spring 60B, the top portion 37Ba cannot be overcome, so that the engaging / disengaging spring 60B is maintained in the locked position.

<About the effect>
Also in the hook 10 and the hook latch disengagement mechanism 100B having the above configuration, the tip contact portion 64B (engagement / disengagement stopper) is similar to the hook 10 and the hook latch disengagement mechanism 100 of the first embodiment described above. Is located at the locking position, the wire rope ring (eye) moves along the engagement / disengagement spring 60B, so that the wire rope ring (eye) is in the gap S2 between the hook tip 22 and the hook latch 30B. It is possible to prevent the intrusion. Further, the hook latch detachment prevention mechanism 100B has a small number of parts and can have a simple structure.

Further, when the engagement / disengagement spring 60B (engagement / disengagement stopper) is slightly rotated from the standing (neutral) position to the hook tip 22 side, the pair of leg portions 63B abut on the inclined portion 37Bb. At this time, the restoring force from the tip contact portion 64B (main deformed portion) can rotate the engagement / disengagement spring 60B (engagement / disengagement stopper) toward the locking position, and the tip touches the hook tip 22. The contact portion 64B can be locked. Moreover, as long as the pair of legs 63B does not get over the top portion 37Ba, the engagement / disengagement spring 60B (engagement / disengagement stopper) can be maintained in the locked position.

Further, by rotating the engagement / disengagement spring 60B from the standing (neutral) position to the release position, the release state in which the tip contact portion 64B is located on the opposite side (Z1 side; upper side) of the hook tip 22 is maintained. be able to. Even at this time, as long as the pair of legs 63B does not get over the top portion 37Ba, the engagement / disengagement spring 60B (engagement / disengagement stopper) can be maintained in the released position.

Further, in the present embodiment, when the pair of leg portions 63B are rotated with respect to the tip contact portion 64B (main deformed portion) so as to close each other, the spring urging convex portion 37B (biased convex portion) When overcoming the top portion 37Ba, the pair of leg portions 63B or the tip contact portion 64B (main deformed portion) bends and deforms in a direction to close each other. Therefore, although the engagement / disengagement spring 60B (engagement / disengagement stopper) has a simple structure, a relatively large urging force can be generated when the top portion 37Ba is overcome. Therefore, it is clarified that the engagement / disengagement spring 60B (engagement / disengagement stopper) is switched between the locking position and the standing (neutral) position. Therefore, it is possible to prevent the engagement / disengagement spring 60B (engagement / disengagement stopper) from rotating from the locking position unintentionally.

Further, in the present embodiment, the hook latch 30B is provided with a pair of side walls 32B and 33B facing each other and a top wall 31B existing between the pair of side walls 32B and 33B. The wall 31B is provided with a shaft protrusion 38B for axially supporting the ends of the pair of legs 63B so as to project from the top wall 31B. Further, the spring urging convex portion 37B (the urging convex portion) protrudes from each of the shaft protruding portions 38B, and the pair of leg portions 63B are pressed by the spring urging convex portion 37B (the urging convex portion), respectively. Will be done.

Therefore, the pair of legs 63B can be rotated so as to close each other when overcoming the top portion 37Ba of the spring-armed convex portion 37B (the urging convex portion), and at that time, the pair of legs The 63B or the tip contact portion 64B (main deformation portion) can be flexed and deformed. Therefore, although the engagement / disengagement spring 60B (engagement / disengagement stopper) has a simple configuration, when the top portion 37Ba is overcome, a large restoring force is generated in the pair of legs 63B in the direction in which the pair of legs 63B close each other. Can be made to. Therefore, it is clarified that the engagement / disengagement spring 60B (engagement / disengagement stopper) is switched between the locking position and the standing (neutral) position. Therefore, it is possible to prevent the engagement / disengagement spring 60B (engagement / disengagement stopper) from rotating from the locking position unintentionally.

[Third Embodiment]
Hereinafter, the hook 10 provided with the hook latch detachment prevention mechanism 100C and the hook latch detachment prevention mechanism 100C according to the third embodiment of the present invention will be described with reference to the drawings. In the present embodiment, the same configuration as that of the first embodiment described above will be described with reference to the same reference numerals.

<About the configuration of the hook latch detachment prevention mechanism 100C>
In this embodiment, a hook latch disengagement prevention mechanism 100C different from that of the first embodiment and the second embodiment is used. FIG. 12 is a side view showing the configuration of the hook 10 according to the third embodiment of the present invention. 13A and 13B are side views showing the configuration of the hook latch 30C according to the third embodiment of the present invention, in which FIG. 13A shows a shape seen from the side wall 32C side, and FIG. 13B shows a shape seen from the side wall 33 side. The shape is shown. FIG. 14 is a plan view showing the configuration of the engagement / disengagement spring 60C.

Regarding the hook latch 30C according to the present embodiment, the hook latch 30B of the present embodiment has the same top wall 31C as the top wall 31, the side walls 32C and 33C similar to the side walls 32 and 33, and the same as the shaft support hole 34. It has a shaft support hole 34C and a tip portion 35C similar to the tip portion 35. However, the hook clutch 30C according to the present embodiment has a portion different from the hook clutch 30 according to the first embodiment and the hook clutch 30B according to the second embodiment.

As shown in FIGS. 12 to 14, in the hook latch 30C of the present embodiment, the shaft hole 36C formed in the side wall 32C and the shaft hole 36C formed in the side wall 33C are formed in the width direction (Y direction). It is not on the same straight line but at different positions. In the following description, the shaft hole 36C provided in the side wall 32C is referred to as a first shaft hole 36C1, and the shaft hole 36C provided in the side wall 33 is referred to as a second shaft hole 36C2. The first shaft hole 36C1 and the second shaft hole 36C2 together with the engaging / disengaging spring 60C described later constitute a hook disengagement prevention mechanism 100C.

In the configurations shown in FIGS. 13A and 13B, the second shaft hole 36C2 is offset so as to be located closer to the top wall 31C than the first shaft hole 36C1. However, the first shaft hole 36C1 and the second shaft hole 36C2 are not largely offset, and the respective shaft portions 61C, which will be described later, are offset within a range that can be satisfactorily inserted. Further, the axis L connecting the center of the first shaft hole 36C1 and the center of the second shaft hole 36C2 is provided so as to intersect the top wall 31C at a predetermined angle θ. This right angle θ may be 90 degrees, or may be an appropriate angle other than 90 degrees. The first shaft hole 36C1 and the second shaft hole 36C2 having such a positional relationship correspond to a deformation action portion and a posture transition portion.

Next, the deengagement spring 60C will be described. As shown in FIG. 14, the engagement / disengagement spring 60C is a member that rotates with respect to the hook latch 30C with the first shaft hole 36C1 and the second shaft hole 36C2 described above as fulcrums. On one end side of this rotation, the engagement / disengagement spring 60C is locked to the hook tip 22. The engagement / disengagement spring 60C has a first shaft portion 61C1 inserted into the first shaft hole 36C1 and a second shaft portion 61C2 inserted into the second shaft hole 36C2. Here, as shown in FIG. 14, the length of the first shaft portion 61C1 is provided to be sufficiently longer than the length of the second shaft portion 61C2. Therefore, since the first shaft portion 61C1 can be deeply inserted into the first shaft hole 36C1, it serves as a reference when the engagement / disengagement spring 60C rotates. On the other hand, the second shaft portion 61C2 is inserted into the second shaft hole 36C2 not so deeply (shallowly). Therefore, as described later, even when the tip contact portion 64C is deformed so as to reduce the diameter (the engaging / disengaging spring 60C is deformed so as to be twisted), the rotation of the engaging / disengaging spring 60C is stabilized. It is structured so that

However, the length of the first shaft portion 61 and the length of the second shaft portion 62 may be about the same length.

Here, in a state where no urging force is applied to the disengagement spring 60C, the first shaft portion 61C1 and the second shaft portion 61C2 are located on the same straight line in the width direction (Y direction), or In FIG. 12, it is preferable that the first shaft portion 61C1 is located closer to the top wall 31 side of the hook latch 30C than the second shaft portion 61C2. In that case, the first shaft portion 61C1 and the second shaft portion 61C2 are respectively provided in the first shaft hole 36C1 and the second shaft hole 36C2 which are offset as shown in FIGS. 13 (A) and 13 (B). At the time of insertion, a predetermined urging force is generated in the engagement / decoupling spring 60C. The direction of this urging force is such that the tip contact portion 64C of the engagement / disengagement spring 60C can be pressed against the hook tip 22 (that is, the counterclockwise direction in FIG. 12).

However, when the tip contact portion 64C of the engagement / disengagement spring 60C is locked to the hook tip 22 as shown in FIG. 12, the engagement / disengagement spring 60C is oriented in either counterclockwise or clockwise in FIG. It may be in a state where no urging force is generated. In this case, when the engaging / disengaging spring 60C is rotated in the clockwise direction from the position of the engaging / disengaging spring 60C shown in FIG. 12, an urging force that opposes the clockwise rotation is generated due to the deformation of the engaging / disengaging spring 60C. Occurs.

Further, the engagement / disengagement spring 60C is provided with a tip contact portion 64C. As shown in FIG. 12, the tip contact portion 64C is a portion that contacts the hook tip 22 of the hook body 20, and in the present embodiment, the tip contact portion 64C draws a spiral of one or more turns. Is provided (in a loop). The hollow portion located inside the spiral (loop-shaped) tip contact portion 64C is referred to as the loop hole 64C1. The hook tip 22 is inserted into the loop hole 64C1.

Further, the leg portion 63C (hereinafter, if necessary, the first leg portion 63C1) is referred to so as to connect the end portion of the tip contact portion 64C on one side (Y1 side) in the width direction with the first shaft portion 61C1. ) Is provided. Similarly, the leg portion 63C (hereinafter, if necessary, referred to as the second leg portion 63C2) so as to connect the other end (Y2 side) of the tip contact portion 64C in the width direction with the second shaft portion 61C2. ) Is provided. In FIG. 14, the first leg portion 63C1 and the second leg portion 63C2 are provided in a straight line, but may be provided in a curved shape.

<About action>
The operations of the hook 10 and the hook detachment prevention mechanism 100C having the above configuration will be described below.

As shown in FIG. 12, when the tip contact portion 64C is located at the locking position locked to the hook tip 22, the urging force of the engaging / disengaging spring 60C in the counterclockwise direction in FIG. 12 is the engaging / disengaging spring. It is in a state where it is generated at 60C, or there is no urging force in either the counterclockwise direction or the clockwise direction.

From this state, the engaging / disengaging spring 60C is rotated clockwise in FIG. 12, and when the engaging / disengaging spring 60C is viewed from the side, the first leg portion 63C1 and the second leg portion 63C2 overlap each other (neutral). When rotated to the position, a large urging force is stored in the engagement / disengagement spring 60C. This situation will be described with reference to FIGS. 15 to 17. FIG. 15 is a diagram showing the positional relationship between the first shaft portion 61C1 and the second shaft portion 61C2 when the engagement / disengagement spring 60C is positioned at the locking position as shown in FIG. Further, FIG. 16 is a diagram showing the positional relationship between the first shaft portion 61C1 and the second shaft portion 61C2 when the engagement / disengagement spring 60C is located in the upright (neutral) position. Further, FIG. 17 is a plan view showing the shape of the engagement / disengagement spring 60C when the engagement / disengagement spring 60C is in the upright (neutral) position.

When the engagement / disengagement spring 60C rotates from the locking position as shown in FIG. 15 to the standing (neutral) position as shown in FIG. 16, the relative positions of the first leg portion 63C1 and the second leg portion 63C2 change. To do. Specifically, when the engagement / disengagement spring 60C is viewed from the side, the position of the second shaft portion 61C2 does not overlap with the extension direction of the first leg portion 63C1 in FIG. However, in FIG. 16, the position of the second shaft portion 61C2 overlaps with the stretching direction of the first leg portion 63C1. In the case of the positional relationship shown in FIG. 16, it is preferable that the center of the tip contact portion 64C exists on the axis L.

At this time, when the engagement / disengagement spring 60C is viewed in a plan view, it has a shape as shown in FIG. That is, the tip contact portion 64C is forcibly deformed by the relative positional change between the first shaft portion 61C1 and the tip contact portion 64C and the second shaft portion 61C2 and the first leg portion 63C1, and the loop hole 64C1 Is in a reduced diameter state. In addition to the one shown in FIG. 17, at least one of the first leg portion 63C1 and the second leg portion 63C2 of the engagement / disengagement spring 60C bends or inclines depending on the positional relationship with respect to the side wall 32C and the side wall 33C. Etc. may be deformed.

In such a reduced diameter state of the loop hole 64C1, in the engagement / disengagement spring 60C, the vicinity of the tip contact portion 64C centered on the loop hole 64C1 (near the region A surrounded by the alternate long and short dash line in FIG. 17) A large spring force (urging force) that eliminates the diameter reduction of the loop hole 64C1 is stored. However, in the state where the engagement / disengagement spring 60C is located at the upright position corresponding to FIG. 1, the engagement / disengagement spring 60C is located at the independent position. Therefore, unless an external force is applied to the engaging / disengaging spring 60C, the engaging / disengaging spring 60C does not rotate in either the direction of the hook tip 22 side or the side away from the hook tip 22.

Here, from the state where the engagement / disengagement spring 60C is located at the above-mentioned standing (neutral) position, the engagement / disengagement spring 60C is slightly rotated toward the hook tip 22 side. Then, a large urging force that eliminates the reduced diameter state of the tip contact portion 64C acts, so that the engagement / disengagement spring 60C rotates from the standing (neutral) position to the locking position as shown in FIG. try to. At this time, when the hand holding the engagement / disengagement spring 60C is released, the engagement / disengagement spring 60C is rotated by its own urging force and is located at the locking position as shown in FIG. Then, the engagement / disengagement spring 60C can maintain the locked state in which the tip contact portion 64C is in contact with the hook tip 22 by the urging force possessed by itself.

On the other hand, even when the engaging / disengaging spring 60C is rotated slightly away from the hook tip 22 from the state where the engaging / disengaging spring 60C is located at the above-mentioned standing (neutral) position, the tip contact portion 64C is contracted. A large urging force that eliminates the diameter state acts. Therefore, the engagement / disengagement spring 60C tries to rotate from the standing (neutral) position to the release position (position corresponding to FIG. 8) on the side opposite to the hook tip 22. At this time, when the hand holding the engaging / disengaging spring 60C is released, the engaging / disengaging spring 60C is rotated by its own urging force and is located at the above-mentioned release position. Then, the engaging / disengaging spring 60C can maintain the released state in which the tip contact portion 64C is located on the opposite side (Z1 side; upper side) of the hook tip 22 due to the urging force possessed by the spring 60C.

<About the effect>
In the hook 10 and the hook latch disengagement prevention mechanism 100C having the above configuration, the engagement / disengagement spring 60C (engagement / disengagement stopper) abuts on the hook tip 22 and the engagement / disengagement spring 60C (engagement / disengagement stopper) rotates. A tip contact portion 64C (main deformed portion) that causes the largest elastic deformation is provided. Further, when the engagement / disengagement spring 60C (engagement / disengagement stopper) is located at the upright position, the hook latch 30C is in contact with the tip more than when it is located at the overturning position (first overturning position or second overturning position). The first shaft hole 36C1 and the second shaft hole 36C2 (deformation action part) that cause a large elastic deformation with respect to the part 64C (main deformation part) are provided. Further, the first shaft hole 36C1 and the second shaft hole 36C2 also serve as a posture transition portion. That is, in the first shaft hole 36C1 and the second shaft hole 36C2 (posture transition portion), the engagement / disengagement spring 60C (engagement / disengagement stopper) is in the standing position and the overturning position (locking position (first overturning position) or release position (locking position (first overturning position)). When it is located between (second overturning position)), the engaging / disengaging spring 60C (engaging / disengaging stopper) is moved from the tip contact portion 64C (main deformed portion) by the restoring force to the overturning position (locking position (first overturning position)). Position) or release position (second fall position)).

Therefore, also in the present embodiment, when the tip contact portion 64C (engagement / disengagement stopper) is located at the locking position, the wire is similar to the configuration in the first embodiment and the second embodiment described above. By moving the rope loop (eye) along the engagement / disengagement spring 60C, it is possible to prevent the wire rope loop (eye) from entering the gap S2 between the hook tip 22 and the hook latch 30C. Become. Further, the hook latch detachment prevention mechanism 100C has a small number of parts and can have a simple structure.

Further, when the engaging / disengaging spring 60C (engaging / disengaging stopper) is slightly rotated from the standing (neutral) position to the hook tip 22 side, the first shaft hole 36C1 (mainly deformed portion) is restored by the restoring force of the tip contact portion 64C (main deformed portion). The first shaft portion 61C1) and the second shaft hole 36C2 (second shaft portion 61C2) attempt to shift from the positional relationship shown in FIG. 17 to the positional relationship shown in FIG. At this time, the engagement / disengagement spring 60C (engagement / disengagement stopper) can be rotated toward the locking position, and the tip contact portion 64C can be locked to the hook tip 22. Moreover, in the rotation direction of the engagement / disengagement spring 60C, as long as the center of the tip contact portion 64C does not exceed the axis L, the engagement / disengagement spring 60C (engagement / disengagement stopper) can be maintained in the locked position. it can.

Further, by rotating the engagement / disengagement spring 60C from the standing (neutral) position to the release position, the release state in which the tip contact portion 64C is located on the opposite side (Z1 side; upper side) of the hook tip 22 is maintained. be able to. Even at this time, as long as the center of the tip contact portion 64C does not exceed the axis L, the engagement / disengagement spring 60C (engagement / disengagement stopper) can be maintained in the release position.

Further, in the present embodiment, the one side wall 32C of the hook latch 30C is provided with the first shaft hole 36C1, and the other side wall 33C of the hook latch 30C is provided with the second shaft hole 36C2. Further, in the engagement / disengagement spring 60C (engagement / disengagement stopper), the first shaft portion 61C1 inserted into the first shaft hole 36C1, the second shaft portion 61C2 inserted into the second shaft hole 36C2, and the tip contact portion 64C (main). The first leg portion 63C1 that connects between the deformed portion) and the first shaft portion 61C1, and the second leg portion 63C2 that connects between the tip contact portion 64C (main deformed portion) and the second shaft portion 61C2. When the hook latch 30C is viewed from the side, the tip contact portion 64C (main deformed portion) is hooked on the axis L connecting the center of the first shaft portion 61C1 and the center of the second shaft portion 61C2. It intersects the stretching direction of the first leg portion 63C1 and the stretching direction of the second leg portion 63C2 in a state of being in contact with the tip 22.

Therefore, by slightly rotating the center of the tip contact portion 64C toward the hook tip 22 side from the state where it exists on the axis L, the engaging / disengaging spring 60C is attached to the tip contact portion 64C (main deformed portion). It is possible to switch from the standing (neutral) position to the locking position by using the force (restoring force). Further, by rotating the center of the tip contact portion 64C slightly opposite to the hook tip 22 from the state where it exists on the axis L, the engagement / disengagement spring 60C becomes the tip contact portion 64C (main deformed portion). It is possible to switch from the standing (neutral) position to the releasing position by using the urging force (restoring force) of. Further, the urging force generated in the engagement / disengagement spring 60C (engagement / disengagement stopper) can be utilized to maintain the state in which the engagement / disengagement spring 60C is located at the locking position. Further, the urging force generated in the engagement / disengagement spring 60C (engagement / disengagement stopper) can be utilized to maintain the state in which the engagement / disengagement spring 60C is located at the release position.

Further, in the present embodiment, the engagement / disengagement spring 60C (engagement / disengagement stopper) is formed of a wire rod 60a having a spring property, and the tip contact portion 64C (main deformed portion) winds the wire rod 60a in a loop shape. It is formed by turning. Therefore, in the loop-shaped tip contact portion 64C (main deformed portion), a large urging force can be generated by reducing the diameter. As a result, the engagement / disengagement spring 60C can be switched from the standing (neutral) position to the locking position by using the urging force (restoring force) of the tip contact portion 64C (main deformed portion), and also stands (upright). It is possible to switch from the neutral) position to the release position.

<Modification example>
Although each embodiment of the present invention has been described above, the present invention can be variously modified in addition to the above. This will be described below.

In the above-mentioned third embodiment, the first shaft hole 36 and the second shaft hole 36C2 are separately provided. However, a long hole-shaped shaft hole such that the first shaft hole 36 and the second shaft hole 36C2 are integrated may be provided. An example of such a configuration is shown in FIG. FIG. 18 is a side view showing a hook latch 30D according to a modified example of the present invention. In the configuration shown in FIG. 18, the hook latch 30D on which the disengagement spring 60C is supported is the same as the top wall 31D similar to the top wall 31, the side walls 32D and 33D similar to the side walls 32 and 33, and the shaft support hole 34. The shaft support hole 34D and the tip portion 35D similar to the tip portion 35 are provided.

In the configuration shown in FIG. 18, a long shaft hole 39D is provided so as to penetrate the side wall 32D and the side wall 33D. The long hole 39D for the shaft corresponds to the deformation action portion and the posture transition portion. The long hole 39D for the shaft is a long hole-shaped shaft hole. The first shaft portion 61C1 is inserted into the long shaft hole 39D from the side wall 32D side, and the second shaft portion 61C2 is inserted from the side wall 33D side. Therefore, even in the configuration in which the long hole 39D for the shaft exists in the hook latch 30D, the engagement / disengagement spring 60C has the locking position shown in FIG. 1, the standing (neutral) position shown in FIG. 4, and the releasing position shown in FIG. It can be positioned at any position.

Further, in the configuration shown in FIG. 18, the first shaft portion 61C1 and the second shaft portion 61C2 can be easily moved inside the long shaft hole 39D. Therefore, the engagement / disengagement spring 60C can be more easily assembled to the hook latch 30D.

Further, in each of the above-described embodiments, the respective shaft portions 61, 61B, and 61C are integrated with the leg portion 63, respectively. However, the respective shaft portions 61, 61B, 61C may be provided separately from the leg portions 63.

Further, in each of the above-described embodiments, the engagement / disengagement springs 60, 60B, 60C composed of the wire rod 60a are described as the engagement / disengagement stoppers. However, the engagement / disengagement stopper is not limited to the engagement / disengagement springs 60, 60B, 60C composed of the wire rod 60a. For example, a shaft spring, a spiral spring, or a disc spring may be used for the tip contact portion. Further, what kind of engaging / disengaging stopper is as long as it generates an urging force by changing the position of the second shaft hole 36C2 with respect to the first shaft hole 36 when the engaging / disengaging stopper rotates. Is also good. For example, a planar spring may be used, or one or a plurality of S springs may be combined, and a part of the figure 8 wire is cut out and the vicinity of the cut out portion is used as the shaft portion. It may be a thing.

Further, in the above-described embodiment, the first shaft portion 61 and the second shaft portion 62 are configured to be located on the same plane when the engagement / disengagement spring 60 is not attached to the hook latch 30. .. However, in a state where the engagement / disengagement spring 60 is not attached to the hook latch 30, the first shaft portion 61 and the second shaft portion 62 may be configured to be located on different planes.

10 ... Hook, 20 ... Hook body, 21 ... Mounting hole, 22 ... Hook tip, 23 ... Shaft hole, 24 ... Movement blocking wall, 30, 30B, 30C, 30D ... Hook latch, 31, 31B, 31C, 31D ... Heaven Wall, 32, 32B, 32C, 32D, 33, 33B, 33C, 33D ... Side wall, 34, 34B, 34C, 34D ... Shaft support hole, 35, 35B, 35C, 35D ... Tip, 36, 36B, 36C ... Shaft Holes, 36C1 ... 1st shaft hole (corresponding to deformation action part and posture transition part), 36C2 ... 2nd shaft hole (corresponding to deformation action part and posture transition part), 37, 37B ... Spring-loaded urging convex part (deformation action) (Corresponding to the portion and the urging convex portion), 37a, 37Ba ... Top portion, 37b, 37Bb ... Inclined portion (corresponding to the posture transition portion), 38B ... Shaft protrusion, 39B ... Opening, 39D ... Shaft slot, 40 ... Rotating shaft, 50 ... Latch urging spring, 60, 60B, 60C, 60D ... Engagement / disengagement spring (corresponding to engagement / disengagement stopper), 60a ... Wire rod, 61, 61B ... Shaft part, 61C1 ... First shaft part, 61C2 ... 2nd shaft part, 63, 63B ... Leg part (corresponding to the main deformed part), 63C ... Leg part, 63C1 ... 1st leg part, 63C2 ... 2nd leg part, 64, 64B ... Tip contact part, 64C ... Tip contact part (corresponding to the main deformed part), 64C1 ... Loop hole, 100, 100B, 100C ... Hook latch disengagement prevention mechanism, A ... Area, S1 ... Closed space, S2 ... Gap, L ... Axis

Claims (8)

1. A hook latch disengagement mechanism that prevents the hook latch, which is rotatably provided on the hook body and is urged to close the hook opening, from rotating away from the hook tip of the hook body. hand,
   It is made of a springy member and has a engaging / disengaging stopper rotatably attached to the hook latch.
   The engagement / disengagement stopper can rotate with respect to the hook latch between a first overturning position away from the rotation fulcrum of the hook latch or a second overturning position on the rotation fulcrum side and an upright position. Attached to
   The engagement / disengagement stopper is provided with a main deformation portion in which elastic deformation occurs as the engagement / disengagement stopper rotates.
   The hook latch is provided with a deformation acting portion that causes a larger elastic deformation with respect to the main deformation portion when the engagement / disengagement stopper is located at the upright position than when it is located at the overturning position. ,
   Further, the hook latch is restored from the main deformed portion when the engagement / disengagement stopper is located between the standing position and the first overturning position, or between the standing position and the second overturning position. A posture transition portion is provided in which the engagement / disengagement stopper is displaced to the tipping position by force.
   The hook latch detachment prevention mechanism is characterized by this.
2. The hook latch disengagement prevention mechanism according to claim 1.
   The engagement / disengagement stopper is provided with a leg portion from the main deformed portion to the hook latch.
   The deforming action portion is an urging convex portion that presses the leg portion to elastically deform the leg portion or the main deforming portion.
   The hook latch detachment prevention mechanism is characterized by this.
3. The hook latch disengagement prevention mechanism according to claim 2.
   The hook latch is provided with a pair of side walls facing each other, and also
   The urging protrusions protrude from the respective side walls and
   The pair of legs are pressed by the urging protrusions, respectively.
   The hook latch detachment prevention mechanism is characterized by this.
4. The hook latch disengagement prevention mechanism according to claim 2.
   The hook latch is provided with a pair of side walls facing each other and a top wall existing between the pair of side walls.
   The top wall is provided with a shaft protrusion for axially supporting the ends of the pair of legs so as to project from the top wall.
   The urging convex portion protrudes from each of the shaft projecting portions.
   The pair of legs are pressed by the urging protrusions, respectively.
   The hook latch detachment prevention mechanism is characterized by this.
5. The hook latch disengagement prevention mechanism according to claim 1.
   The hook latch is provided with a pair of side walls facing each other, and also
   One side wall of the hook latch is provided with a first shaft hole, and the other side wall of the hook latch is provided with a second shaft hole.
   The engagement / disengagement stopper connects the first shaft portion inserted into the first shaft hole, the second shaft portion inserted into the second shaft hole, and the main deformed portion and the first shaft portion. A first leg portion and a second leg portion connecting the main deformed portion and the second shaft portion are provided.
   When the hook latch is viewed from the side, the axis connecting the center of the first shaft hole and the center of the second shaft hole is the first leg portion in a state where the main deformed portion is in contact with the tip of the hook. Crosses the stretching direction of the second leg and the stretching direction of the second leg.
   The hook latch detachment prevention mechanism is characterized by this.
6. The hook latch disengagement prevention mechanism according to claim 1.
   The hook latch is provided with a pair of side walls facing each other, and also
   One side wall of the hook latch and the other side wall are provided with an elongated shaft hole having an elongated hole shape.
   The engagement / disengagement stopper includes a first shaft portion inserted into the shaft elongated hole on one side wall, a second shaft portion inserted into the shaft elongated hole on the other side wall, and a main deformed portion. A first leg portion that connects between the first shaft portion and a second leg portion that connects between the main deformed portion and the second shaft portion are provided.
   When the hook latch is viewed from the side, the longitudinal direction of the long hole for the shaft is the extension direction of the first leg portion and the extension of the second leg portion in a state where the main deformed portion is in contact with the hook tip. Crossing the direction,
   The hook latch detachment prevention mechanism is characterized by this.
7. The hook latch disengagement prevention mechanism according to any one of claims 1 to 6.
   The main deformed portion is formed by winding the wire rod in a loop shape.
   The hook latch detachment prevention mechanism is characterized by this.
8. A hook having a hook main body and a hook latch rotatably provided on the hook main body.
   The hook latch has a hook latch disengagement prevention mechanism for preventing the hook latch from rotating away from the hook tip of the hook body.
   The hook latch disengagement mechanism is formed of a member having a spring property, and includes a engaging / disengaging stopper rotatably attached to the hook latch.
   The engagement / disengagement stopper can rotate with respect to the hook latch between a first overturning position away from the rotation fulcrum of the hook latch or a second overturning position on the rotation fulcrum side and an upright position. Attached to
   The engagement / disengagement stopper is provided with a main deformation portion in which elastic deformation occurs as the engagement / disengagement stopper rotates.
   The hook latch is provided with a deformation acting portion that causes a larger elastic deformation with respect to the main deformation portion when the engagement / disengagement stopper is located at the upright position than when it is located at the overturning position. ,
   Further, the hook latch is restored from the main deformed portion when the engagement / disengagement stopper is located between the standing position and the first overturning position, or between the standing position and the second overturning position. A posture transition portion is provided in which the engagement / disengagement stopper is displaced to the tipping position by force.
   A hook that features that.

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