JP7343259B2 - Hook latch retaining mechanism and hook - Google Patents

Description

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

Generally, a hook is provided with an arm-shaped member called a hook latch, and the hook latch is biased in the closing direction by a spring or the like to prevent a wire rope, etc. hung from 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 no longer pulled downward by the load of the suspended load. As a result, part of the loop (eye) of the wire rope wraps around to the outside from the tip of the hook, and a load is applied to a part of the eye, causing the wire rope to come off, known as the "wisdom ring phenomenon" ("back slipping phenomenon"). ) may occur.

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

Further, in Patent Document 2, a sub-retention stop (3) is rotatably attached to the main removal stop (2), and the sub-retention stop (3) is operated by a sub-torsion spring (16) at the tip of the hook. It is biased towards the part. Further, Patent Document 3 discloses a configuration in which a guide rod (22) of a hook tip cover (9) that covers the tip side of a crane hook (2) is movable along a guide groove (15) of a retainer (7). is disclosed.

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

Incidentally, the hook latch release prevention mechanisms disclosed in Patent Documents 1 to 3 have complicated structures and have poor operability. For example, in the configuration disclosed in Patent Document 1, a detachment prevention tool (21) is attached to cover the detachment prevention tool (9), and a spring (22) that applies a biasing force to the detachment prevention tool (21) is further attached. ing. Therefore, the number of parts is large and the structure is complicated. Also. When removing the wire rope from the hook, it is necessary to operate both the stopper (9) and the remover (21), resulting in poor operability when removing the wire rope.

In addition, in the configuration disclosed in Patent Document 2, a sub-stop (3) is rotatably attached to the main stop (2), and the sub-stop (3) is driven by a sub-torsion spring (16). It is biased 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 retainer (3) while resisting the biasing force of the secondary torsion spring (16), which may result in poor operability when hanging the wire rope. It has become.

In addition, in the configuration disclosed in Patent Document 3, in addition to the guide groove (15), the retainer (7) is provided with a regulating convex part (27) and a posture stabilizing convex part (29), and the hook tip cover (9 ) It is necessary to provide a guide rod (22) and an inner pin (28) inside the inner pin. Therefore, the structure is complicated. Furthermore, in order for the retainer (7) to cover or release the hook tip, the hook tip cover (9) must be slid, resulting in poor operability.

The present invention has been made based on the above circumstances, and an object thereof is to provide a hook latch retaining mechanism and a hook that have a small number of parts, a simple structure, and good operability. It is.

In order to solve the above problems, according to a first aspect of the present invention, a hook latch, which is rotatably provided on a hook body and is biased to close a hook opening, extends from the hook tip of the hook body. The hook latch is a detachment prevention mechanism that prevents the hook latch from rotating away, and includes an engagement/disengagement stopper that is formed of a member having spring properties and is rotatably attached to the hook latch. An engagement/disengagement stopper is attached to the clutch so as to be rotatable between a first overturned position away from the rotational fulcrum of the hook latch or a second overturned position on the side of the rotational fulcrum and an upright position. The hook latch is provided with a main deformation portion that undergoes elastic deformation as the engagement/disengagement stopper rotates, and the hook latch has a main deformation portion that is elastically deformed as the engagement/disengagement stopper rotates. The hook latch is also provided with a deformation acting part that causes a large elastic deformation to the main deformation part, and the hook latch has an engagement/disengagement stopper that is arranged between the upright position and the first overturning position, or between the upright position and the second overturning position. There is provided a hook latch release preventing mechanism characterized in that a posture transition part is provided in which the engaging/disengaging stopper is moved to the overturning position by a restoring force from the main deformation part when the hook latch is located between the overturning positions. Ru.

Another aspect of the present invention is that, in the above-described invention, the engagement/disengagement stopper is provided with a leg portion extending from the main deformation portion toward the hook latch, and the deformation acting portion presses the leg portion to Preferably, the biasing convex portion is a biasing convex portion that elastically deforms the main deformable portion or the main deformable portion.

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 biasing protrusion protrudes from each side wall, and the biasing protrusion protrudes from each side wall. Preferably, the portions are each pressed by a biasing projection.

In addition, 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 a ceiling wall that exists between the pair of side walls. is provided with a shaft protrusion protruding from the top wall for pivotally supporting the ends of the pair of legs, and a biasing protrusion protrudes from each of the shaft protrusions. Preferably, each of the legs is pressed by a biasing protrusion.

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 of the hook latch is provided with a first shaft hole, and the hook latch is provided with a pair of side walls facing each other. A second shaft hole is provided in 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 stopper. When the hook latch is viewed from the side, In this case, the axis connecting the center of the first axial hole and the center of the second axial hole intersects the extending direction of the first leg and the extending direction of the second leg when the main deformable portion is in contact with the tip of the hook. It is preferable that you do so.

Another aspect of the present invention is that in the above 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 are provided with elongated holes. A long shaft hole is provided, and the engagement/disengagement stopper includes a first shaft portion inserted into the long shaft hole on one side wall, and a second shaft portion inserted into the long shaft hole on the other side wall. A first leg section that connects the main deformation section and the first shaft section and a second leg section that connects the main deformation section and the second shaft section are provided, and the hook latch is viewed from the side. In this case, it is preferable that the longitudinal direction of the shaft elongated hole intersects the extending direction of the first leg portion and the extending direction of the second leg portion in a state in which the main deformable portion is in contact with the tip of the hook.

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

Moreover, in order to solve the above-mentioned problem, according to a second aspect of the present invention, there is provided a hook including a hook main body and a hook latch rotatably provided on the hook main body, the hook latch comprising: It has a hook latch retaining mechanism that prevents the hook body from rotating away from the hook tip, and the hook latch retaining mechanism is formed of a member having spring properties and is rotatably attached to the hook latch. The engaging/disengaging stopper is configured to move the hook latch between a first overturned position away from the rotational fulcrum of the hook latch or a second overturned position on the side of the rotational fulcrum and an upright position. The hook latch is rotatably attached, and the engagement/disengagement stopper is provided with a main deformation part that undergoes elastic deformation as the engagement/disengagement stopper rotates. The hook latch is provided with a deformation acting part that causes a larger elastic deformation to the main deformation part when the hook is in the upright position than when it is in the overturning position. A posture transition part is provided in which the engaging/disengaging stopper is moved to the falling position by a restoring force from the main deformation part when the stopper is located between the falling position or between the standing position and the second falling position. A hook featuring:

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

1 is a side view showing the configuration of a hook according to a first embodiment of the present invention. FIG. FIG. 2 is a side view showing the configuration of a hook latch included in the hook shown in FIG. 1. FIG. FIG. 2 is a perspective view showing the configuration of the hook latch with the engagement/disengagement spring attached according to the first embodiment of the present invention. 4 is a plan view showing the configuration of the hook latch shown in FIG. 3. FIG. 4 is a front view showing the configuration of the hook latch shown in FIG. 3. FIG. FIG. 2 is a plan view showing the configuration of a locking/disengaging spring included in the hook shown in FIG. 1 . FIG. 2 is a side view showing a state in which the engagement/disengagement spring is located at an upright position rotated clockwise from the engagement position shown in FIG. 1; FIG. 8 is a diagram showing a state in which the engagement/disengagement spring is located in a release position rotated clockwise from the upright position shown in FIG. 7; It is a perspective view which shows the structure of the hook latch in the state which concerns on the 2nd Embodiment of this invention, and the engagement/disengagement spring is attached. 10 is a plan view showing the configuration of the hook latch shown in FIG. 9. FIG. 11 is a cross-sectional view showing a state in which the hook latch is cut along the width direction near the opening in FIG. 10. FIG. It is a side view which shows the structure of the hook based on the 3rd Embodiment of this invention. It is a side view which shows the structure of the hook latch based on the 3rd Embodiment of this invention, (A) shows the shape seen from the side wall side, and (B) shows the shape seen from the side wall side. It is a top view which shows the structure of the engagement/disengagement spring based on the 3rd Embodiment of this invention. 13 is a diagram showing the positional relationship between the first shaft portion and the second shaft portion when the locking/disengaging spring is located at the locking position as shown in FIG. 12. FIG. It is a figure which shows the positional relationship of the 1st axial part and the 2nd axial part when the engagement/disengagement spring is located in the upright (neutral) position. FIG. 7 is a plan view showing the shape of the engagement and disengagement spring when the engagement and disengagement spring is in an upright (neutral) position. It is a side view which shows the hook latch based on the modification of this invention.

[First embodiment]
Hereinafter, a hook latch retaining mechanism 100 and a hook 10 including the hook latch retaining mechanism 100 according to a first embodiment of the present invention will be described based on the drawings. In the following description, the Z direction refers to the direction in which the hook 10 is hung, the Z1 side refers to the upper side in the hanging direction of the hook 10, and the Z2 side refers to the upper side in the hanging direction of the hook 10. . Further, the X direction refers to the direction perpendicular to the Z direction and from the hook tip 22 toward the closed space S1 (the left-right direction in FIG. 1), the X1 side refers to the right side in FIG. 1, and the X2 side refers to the direction in the figure. Points 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 (the left side in FIG. In contrast, 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 release prevention mechanism 100>
FIG. 1 is a side view showing the configuration of a hook 10 according to a first embodiment of the present invention. As shown in FIG. 1, the hook 10 includes a hook body 20, a hook latch 30, a rotation shaft 40, a latch biasing spring 50, and an engagement/disengagement spring 60.

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

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

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

FIG. 2 is a side view showing the configuration of the hook latch 30 included in the hook 10, in which (A) shows the shape seen from the side wall 32 side, and (B) shows the 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, 33. The ceiling wall 31 is a portion facing the outside on the opposite side from the closed space S1. Further, the side wall 32 is a wall surface extending from one edge in the width direction of the ceiling wall 31 toward the closed space S1 side. Further, the side wall 33 is a wall surface facing the closed space S1 from the other edge in the width direction of the ceiling wall 31, and faces the side wall 32.

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

A shaft support hole 34 is provided on one side in the longitudinal direction of the hook latch 30. The shaft support hole 34 passes through the pair of side walls 32 and 33 coaxially in the width direction. The rotation shaft 40 mentioned above is inserted into this shaft support hole 34. Thereby, the hook latch 30 rotates about the shaft support hole 34 and the rotation shaft 40 as fulcrums.

Further, a latch biasing spring 50 is arranged in an internal space P1 (see FIG. 3) on the inside side surrounded by the top wall 31 and the pair of side walls 32 and 33 of the hook latch 30. The latch biasing spring 50 is a spring that provides a biasing force that causes the hook latch 30 to move toward the movement prevention wall 24 with the rotation shaft 40 (the shaft support hole 34) as a fulcrum. The latch biasing spring 50 may be, for example, a torsion coil spring, but a spring other than the torsion coil spring may be used. By applying such a biasing force to the hook latch 30 by the latch biasing spring 50, the state in which the tip portion 35 of the top wall 31 of the hook latch 30 collides with the movement prevention wall 24 can be maintained.

Furthermore, shaft holes 36 are provided in the pair of side walls 32 and 33 of the hook latch 30 at positions closer to the distal end side of the hook latch 30 than the shaft support holes 34 are. The shaft hole 36 constitutes a hook latch retaining mechanism 100 together with an engagement/disengagement spring 60 which will be described later. Note that 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 latch 30. As shown in FIGS. 3 to 5, the hook latch 30 is provided with a spring biasing convex portion 37. As shown in FIGS. The spring-biased convex portion 37 is a portion that protrudes more than other portions of the hook latch 30 in the width direction of the hook latch 30. Specifically, the spring-biased convex portion 37 is a portion that protrudes in a direction away from the respective surfaces of the side walls 32 and 33. Note that the spring-biased convex portion 37 protrudes toward the outside on the opposite side from the internal space P1. Further, the spring-biased convex portion 37 corresponds to a deformation acting portion.

Here, the spring biased 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 63 (to be described later) is in contact with (riding on) the top portion 37a, even if you release the hand holding the leg 63, the leg 63 will not contact the top portion 37a. The state can be maintained.

Further, the inclined portion 37b is a portion that is provided at an angle with respect to the longitudinal direction of the hook latch 30, unlike the top portion 37a. Therefore, when the hand holding the leg 63 is released while the leg 63 is in contact with the inclined portion 37b, which will be described later, a restoring force (one pair (biasing force in the direction in which the leg portion 63 closes) causes the leg portion 63 to move toward the base of the inclined portion 37b. Note that the inclined portion 37b corresponds to a posture transition portion.

Next, the engagement/disengagement spring 60 will be explained. FIG. 6 is a plan view showing the configuration of the engagement/disengagement spring 60. Note that the engagement/disengagement spring 60 corresponds to an 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 using the shaft hole 36 as a fulcrum. A pair of leg portions 63 (described later) of this engagement/disengagement spring 60 are configured to exert biasing forces in the direction of closing each other. That is, when the engagement/disengagement spring 60 is removed from the hook latch 30, the shaft portion 61 sides of the pair of legs 63 are provided so as to approach each other (close to each other), as shown by the two-dot chain line in FIG. . On the other hand, the state shown by the solid line in FIG. 6 is when the shaft portion 61 is inserted into the shaft hole 36 of the hook latch 30. Furthermore, by being deformed as shown by the solid line from the two-dot chain line in FIG. When the portion 63 crosses over, a larger biasing force is generated.

At one end of the rotation of the locking and disconnecting spring 60, the locking and disconnecting spring 60 is locked to the hook tip 22. In this locked state, the loop (eye) of the wire rope is difficult to enter into 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 loop (eye) of the wire rope from entering the gap S2. On the other hand, at the other end of the rotation of the engagement and disengagement spring 60, the engagement and disengagement spring 60 abuts on the hook 10 near the attachment hole 21.

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

This engagement/disengagement spring 60 has a pair of shaft portions 61 . The pair of shaft portions 61 are portions that are inserted into the shaft hole 36 of the hook latch 30, and the engagement/disengagement spring 60 is rotatable about the shaft portions 61 (shaft hole 36) as a fulcrum. Note that the length of the shaft portion 61 is set 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. This prevents the leg 63 from slipping out of the shaft hole 36 when the leg 63 climbs over the spring-biased convex portion 37 . However, if the urging force in the direction of closing the pair of legs 63 is very large, the length of the shaft 61 may be approximately the same as the depth of the shaft hole 36; It may be shorter than the hole 36. Furthermore, regardless of the biasing force in the direction of closing the pair of legs 63, if the penetration depth of the shaft hole 36 is sufficiently deep, the length of the shaft portion 61 is approximately the same as the depth of the shaft hole 36. Alternatively, the length of the shaft portion 61 may be shorter than the shaft hole 36.

Note that the engagement/disengagement spring 60 may be provided with a retaining portion for preventing the shaft portion 61 from coming off from the shaft hole 36. In this case, the retaining portion may be configured to extend in the direction in which it is bent, for example, substantially perpendicular to the shaft portion 61, but since it prevents the shaft portion 61 from coming off from the shaft hole 36, If so, the retaining portion does not need to extend substantially perpendicularly to the shaft portion 61.

Furthermore, the engagement/disengagement spring 60 is provided with a pair of leg portions 63 . One end side (base end side) of this 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 a tip abutting portion 64, which will be described later.

This leg portion 63 comes into contact with the spring biasing convex portion 37 at a midway portion thereof. Here, as shown in FIG. 3, the leg portion 63 can come into contact with the spring biasing convex portion 37 at a portion closer to the shaft portion 61. Particularly, when the pair of legs 63 separates (opens) from each other by climbing over the spring-biased convex portion 37 , the leg portions 63 pass through the apex portion of the spring-biased convex portion 37 . Then, when the leg portion 63 passes the apex portion of the spring-biased convex portion 37, the engagement/disengagement spring 60 is elastically deformed so that the distance between the pair of leg portions 63 is widest.

This leg portion 63 is a portion that can be bent and deformed using the tip abutting portion 64 side (base side; proximal end side) as a fulcrum. Further, the pair of leg portions 63 are portions that apply urging force in the direction of closing each other. That is, as shown in FIG. 6, the state after the shaft portion 61 is inserted into the shaft hole 36 (the state shown by the solid line) is different from the state before the shaft portion 61 is inserted into the shaft hole 36 (the state shown by the two-dot broken line). The pair of leg portions 63 are deformed so as to open from each other compared to the state shown in FIG. Due to this deformation, a biasing force is applied to the pair of leg portions 63 in the direction of closing each other.

In addition, when providing a retaining portion that is continuous with the shaft portion 61, by forming the retaining portion in a shape that can be elastically deformed (for example, a torsion spring shape, a coil spring shape, etc.), the above-mentioned elastic deformation can be prevented. Elastic deformation of the retaining portion may also be involved.

Further, as shown in FIGS. 3 and 6, the tip abutting portion 64 is a portion that is continuous to the other end side of the pair of leg portions 63 and is a portion located between the pair of leg portions 63. . This tip contact portion 64 is provided in a curved shape such that the center side in the width direction (Y direction) faces the shaft portion 61 so as not to interfere with the hook tip 22 of the hook body 20 (see FIG. 1). . This tip abutting portion 64 is a portion that mainly applies a biasing force in a direction in which the pair of leg portions 63 close together, and corresponds to a main deformation portion. That is, as shown in FIG. 6, the state after the shaft portion 61 is inserted into the shaft hole 36 (the state shown by the solid line) is different from the state before the shaft portion 61 is inserted into the shaft hole 36 (the state shown by the two-dot broken line). The tip abutting portion 64 is elastically deformed to have a larger curvature than the state shown in FIG. Therefore, the tip abutting portion 64 provides a biasing force in the direction in which the pair of legs 63 close together. The tip abutting portion 64 is curved so that the center 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 body 20.

Note that not only the tip contact portion 64 but also the leg portion 63 may correspond to the main deformation portion. Further, the elastic deformation that increases the distance between the pair of legs 63 may be achieved by bending deformation of the pair of legs 63, and may be achieved by elastically deforming the tip abutting part 64. It's okay to be. Moreover, elastic deformation such that the distance between the pair of leg parts 63 is widened may be realized by both the bending deformation of the pair of leg parts 63 and the elastic deformation of the tip abutting part 64.

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

<About the action>
The operation of the hook 10 and the hook latch retaining 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 an embodiment of the present invention, and is a diagram 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 an embodiment of the present invention, in which the engagement/disengagement spring 60 is located at a release position rotated clockwise from the upright position shown in FIG. FIG.

As described above, the engagement/disengagement spring 60 is formed from the wire rod 60a having spring properties. As shown in FIG. 1, the tip abutting portion 64 of the locking/disengaging spring 60 is located at a locking position (an example of a falling position; referred to as a first falling position) where it is locked to the hook tip 22. At this time, the pair of legs 63 of the engagement/disengagement spring 60 are in contact with not the top portion 37a of the spring biasing convex portion 37 but the midway portion of the inclined portion 37b or the end side of the spring biasing convex portion 37. (Pushing in the end side). Therefore, a biasing force is applied to the engagement/disengagement spring 60 in a direction such that the tip abutting portion 64 comes into contact with the hook tip 22. Therefore, the state in which the tip abutting portion 64 is in contact with the hook tip 22 is maintained.

When the disengagement spring 60 is rotated from such a state where the tip abutting portion 64 is in contact with the hook tip 22 to the upright position as shown in FIG. It approaches the top portion 37a of the convex portion 37. This top portion 37a is not inclined with respect to the longitudinal direction of the hook latch 30 (see FIG. 4), so when the pair of legs 63 is pushing the top portion 37a, the engagement/disengagement spring 60 is supported by hand or the like. Even without it, the standing position shown in FIG. 7 can be maintained, or the biasing force can be resisted with a light force. However, when the engagement and disengagement spring 60 is located in the upright position as shown in FIG. It is elastically deformed.

From the state shown in FIG. 7, the engagement/disengagement spring 60 is slightly rotated clockwise in FIG. Then, the pair of legs 63 pushes in the inclined portion 37b of the spring biasing protrusion 37, so that the biasing force that releases the opened state in which the pair of legs 63 separate from each other causes the engagement and disengagement spring 60 to further move as shown in FIG. The hook rotates clockwise at , thereby locking it to the release position shown in FIG. The unspring 60 rotates. Then, unless a force is applied to the engagement/disengagement spring 60, the top portion 37a cannot be climbed over, so the engagement/disengagement spring 60 is maintained at the release position.

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

Note that even when the engagement and disengagement spring 60 is rotated slightly counterclockwise from the state where the engagement and disengagement spring 60 is located in the upright position as shown in FIG. Since it comes into contact with the inclined portion 37b of the portion 37, the engagement and disengagement spring 60 rotates counterclockwise from the position shown in FIG. 7 due to the biasing force that releases the opened state in which the pair of legs 63 separate from each other. Thereby, the locking/disengaging spring 60 rotates to a locking position where the tip abutting portion 64 abuts the hook tip 22 as shown in FIG. Then, unless a force is applied to the locking/disengaging spring 60, the top portion 37a cannot be climbed over, so the locking/disengaging spring 60 is maintained at the locking position.

<About effects>
The hook 10 and the hook latch retaining mechanism 100 configured as described above are formed of a member having spring properties (wire material 60a), and include a disengagement spring 60 (disengagement stopper) rotatably attached to the hook latch 30. The engagement/disengagement spring 60 (engagement/disengagement stopper) is located at an overturning position (first overturning position) on the distal end side away from the rotational fulcrum (rotation shaft 40) of the hook latch 30 with respect to the hook latch 30. Alternatively, it is attached so as to be rotatable between an overturned position (second overturned position) on the base end side that is the rotation fulcrum side (rotation shaft 40 side) and an upright position, and is attached to the engagement spring 60 (disengagement stopper). ) is provided with a leg portion 63 (main deformation portion) that undergoes the largest elastic deformation when the engagement/disengagement spring 60 (engagement/disengagement stopper) rotates. Furthermore, when the hook latch 30 is located at the upright position, the leg portion 63 (main deformable portion) ) is provided with a spring-biased convex portion 37 (deformation acting portion) that causes large elastic deformation. Further, in the hook latch 30, when the engagement/disengagement spring 60 (engagement/disengagement stopper) is located between the upright position and the overturning position (locking position (first overturning position) or release position (second overturning position)), Then, the engagement/disengagement spring 60 (engagement/disengagement stopper) moves to the overturning position (locking position (first overturning position) or release position (second overturning position)) due to the restoring force from the leg portion 63 (main deformation part). An inclined portion 37b (posture transition portion) is provided.

Therefore, when the tip abutting portion 64 (locking/disengaging stopper) is located at the locking position, the loop (eye) of the wire rope moves along the locking/disengaging spring 60, thereby causing the hook tip 22 and the hook latch 30 to move. It is possible to prevent the loop (eye) of the wire rope from entering the gap S2 between the two. Furthermore, as described above, the hook latch 30 having the same shape as the current hook is provided with the shaft hole 36, and the hook latch retaining mechanism 100 is further attached with the engagement spring 60 (disengagement stopper). Can be configured. Therefore, the number of parts is small and the structure can be simple.

Further, when the pair of legs 63 is in contact with the top portion 37a of the spring biasing convex portion 37 (deformation acting portion), the engagement/disengagement spring 60 (engagement/disengagement stopper) is in the upright (neutral) state shown in FIG. However, when the hook is slightly rotated from the upright (neutral) position toward the hook tip 22 side, the pair of legs 63 comes into contact with the inclined portion 37b. At this time, due to the restoring force from the leg portion 63 (main deformation portion), the locking/disengaging spring 60 (locking/disengaging stopper) can be rotated toward the locking position, and the hook tip 22 is brought into contact with the tip abutting portion. 64 can be locked. In addition, as long as the pair of legs 63 does not climb over the top portion 37a, the locking/disengaging spring 60 (locking/disengaging stopper) can be maintained at the locking position.

Furthermore, by rotating the engagement/disengagement spring 60 from the upright (neutral) position shown in FIG. 7 to the release position shown in FIG. 8, the tip abutting portion 64 moves to the side opposite to the hook tip 22 (Z1 side; The released state located on the proximal end side) can be maintained. At this time, as long as the pair of legs 63 does not climb over the top portion 37a, the engagement spring 60 (disengagement stopper) can remain in the release position.

Further, in this embodiment, the engagement/disengagement spring 60 (engagement/disengagement stopper) is provided with a leg portion 63 extending from the tip contact portion 64 (main deformation portion) toward the hook latch 30, and the deformation acting portion is It is a spring biasing convex portion 37 (biasing convex portion) that presses the leg portion 63 and elastically deforms the leg portion 63 or the tip abutting portion 64 (main deformation portion).

Therefore, when climbing over the top portion 37a of the spring biasing convex portion 37 (biasing convex portion), the pair of legs 63 are largely elastically deformed so as to open from each other. Therefore, although the engagement and disengagement spring 60 (engagement and disengagement stopper) has a simple configuration, it is possible to generate a relatively large biasing force when climbing over the top portion 37a. Therefore, switching of the locking and disengaging spring 60 (locking and disengaging stopper) between the locking position and the upright (neutral) position is made clear. Therefore, it is possible to prevent the locking/disengaging spring 60 (locking/disengaging stopper) from rotating unintentionally from the locking position.

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 biasing convex portion 37 (biasing convex portion) is provided on each of the side walls 32 and 33. The pair of legs 63 protrudes from the spring biasing convex portion 37 (biasing convex portion), respectively.

Therefore, when the pair of legs 63 crosses the top portion 37a of the spring biasing convex portion 37 (biasing convex portion), the pair of legs 63 deforms so that the pair of legs 63 open from each other. I can do it. Therefore, although the engagement/disengagement spring 60 (engagement/disengagement stopper) has a simple structure, the pair of legs 63 are in the direction of closing each other at the tip abutting part 64 (main deformation part) when climbing over the top portion 37a. It can generate a large restoring force. Therefore, switching of the locking and disengaging spring 60 (locking and disengaging stopper) between the locking position and the upright (neutral) position is made clear. Therefore, it is possible to prevent the locking/disengaging spring 60 (locking/disengaging stopper) from rotating unintentionally from the locking position.

[Second embodiment]
Hereinafter, a hook latch retaining mechanism 100B and a hook 10 including the hook latch retaining mechanism 100B according to a second embodiment of the present invention will be described based on the drawings. Note that in this embodiment, the same components as those in the first embodiment described above will be described using the same reference numerals.

<About the configuration of the hook latch release prevention mechanism 100B>
This embodiment uses a hook latch retaining mechanism 100B that is different from the first embodiment. FIG. 9 is a perspective view showing the configuration of the hook latch 30B with the engagement/disengagement spring 60B attached. Further, FIG. 10 is a plan view showing the configuration of the hook latch 30B. FIG. 11 is a sectional view showing a state in which the hook latch 30B is cut along the width direction near the opening 39B in FIG.

As shown in FIGS. 9 to 11, the hook latch 30B of the present embodiment includes 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 35B similar to the tip 35. However, the hook latch 30B according to the present embodiment has different parts from 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. This shaft protrusion 38B is a portion that protrudes in a direction away from the surface of the ceiling wall 31B (in a direction opposite to the interior space P1). Further, a shaft hole 36B is provided so as to pass through 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 shaft protrusion 38B is provided with a spring biasing protrusion 37B. This spring biasing convex portion 37B is a portion for biasing the pair of leg portions 63B in a direction in which the distance between the pair of leg portions 63B becomes narrower. Therefore, the spring-biased convex portion 37B protrudes toward the center in the width direction (Y direction) of the hook latch 30B.

Further, as shown in FIGS. 9 to 11, an opening 39B is provided in the top wall 31B. The opening 39B is a cutout portion of 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 engagement/disengagement spring 60B will be explained. The engagement and disengagement spring 60B is different from the engagement and disengagement spring 60 described in the first embodiment, and the pair of leg portions 63B are portions that apply urging force in the direction of opening each other.

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

Also in this embodiment, when the distal end abutting portion 64B of the disengagement spring 60B is located at the engaged position where it is engaged with the hook distal end 22, the pair of leg portions 63B of the disengagement spring 60B are It abuts not on the top portion 37Ba of the biasing protrusion 37B but on the middle part of the inclined portion 37Bb or on the end side of the spring biasing protrusion 37B (the end side is pushed in). Here, since the pair of legs 63B applies a biasing force in the direction of increasing the distance from each other, the pair of legs 63B does not try to move toward the top portion 37Ba of the spring biasing convex portion 37B, but is biased by the spring. It maintains a state in which it is in contact with the end side of the convex portion 37B. Therefore, a biasing force is applied to the engagement/disengagement spring 60B in a direction such that the tip abutting portion 64B comes into contact with the hook tip 22. Therefore, the state in which the tip abutting 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 such a state where the tip abutting portion 64B is in contact with the hook tip 22, the pair of legs 63B approaches the top portion 37Ba. However, at this time, each of the leg parts 63B is pushed in by the spring-biased convex part 37B so that the distance between the pair of leg parts 63B becomes narrower. When the pair of leg portions 63B are approaching the top portion 37Ba (when the engagement/disengagement spring 60B is present at the position corresponding to FIG. The leg portion 63B is closed most narrowly, and the tip abutting portion 64B or the pair of leg portions 63B is flexibly deformed.

When the engagement/disengagement spring 60B is slightly rotated toward the side opposite to the hook tip 22 from the state approaching the top portion, the pair of legs 63B abuts the inclined portion 37Bb of the spring biasing convex portion 37B. . Therefore, due to the biasing force (restoring force) that releases the closed state so that the pair of legs 63B approaches each other, the disengagement spring 60B further moves toward the side opposite to the hook tip 22 (position corresponding to FIG. 8). Rotate. Unless a force toward the hook tip 22 is applied to the engagement spring 60B, the top portion 37Ba cannot be overcome, so the engagement spring 60B is maintained at the release position.

Note that even when the pair of legs 63B slightly rotates the engagement/disengagement spring 60B toward the hook tip 22 from the upright position approaching the top portion 37Ba, the pair of legs 63B remains in the position of the spring. It comes into contact with the inclined portion 37Bb of the biasing convex portion 37B. Therefore, the engagement and disengagement spring 60B further rotates toward the hook tip 22 side by the biasing force that releases the closed state so that the pair of legs 63B approaches each other. Since the top portion 37Ba cannot be climbed over unless a force is applied to the engagement spring 60B, the engagement spring 60B is maintained at the engagement position.

<About effects>
Also in the hook 10 and the hook latch release prevention mechanism 100B having the above-described configurations, the tip contact portion 64B (disengagement stopper) is similar to the hook 10 and the hook latch release prevention mechanism 100 of the first embodiment described above. When the wire rope is located at the locking position, the wire rope loop (eye) moves along the locking and disengaging spring 60B, and the wire rope loop (eye) moves into the gap S2 between the hook tip 22 and the hook latch 30B. can be prevented from entering. Further, the hook latch release 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 upright (neutral) position toward the hook tip 22 side, the pair of leg portions 63B abut against the inclined portion 37Bb. At this time, due to the restoring force from the tip contact portion 64B (main deformation portion), the locking/disengaging spring 60B (locking/disengaging stopper) can be rotated toward the locking position, and the hook tip 22 is brought into contact with the tip. The contact portion 64B can be locked. In addition, as long as the pair of legs 63B does not climb over the top portion 37Ba, the engagement/disengagement spring 60B (disengagement stopper) can be maintained at the engagement position.

Further, by rotating the engagement/disengagement spring 60B from the upright (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) from the hook tip 22 is maintained. be able to. At this time, as long as the pair of legs 63B does not climb over the top portion 37Ba, the engagement/disengagement spring 60B (engagement/disengagement stopper) can be maintained at the release position.

In addition, in this embodiment, when the pair of legs 63B are rotated relative to the tip abutting portion 64B (main deformation portion) so as to close each other, the spring biasing convex portion 37B (biasing convex portion) is rotated. When climbing over the top portion 37Ba, the pair of leg portions 63B or the tip contact portions 64B (main deformation portions) are flexibly deformed in the direction of closing each other. Therefore, although the engagement and disengagement spring 60B (engagement and disengagement stopper) has a simple configuration, it is possible to generate a relatively large biasing force when climbing over the top portion 37Ba. Therefore, switching of the engagement/disengagement spring 60B (engagement/disengagement stopper) between the engagement position and the upright (neutral) position is made clear. Therefore, it is possible to prevent the locking/disengaging spring 60B (locking/disengaging stopper) from rotating unintentionally from the locking position.

Furthermore, in this embodiment, the hook latch 30B is provided with a pair of side walls 32B, 33B that face each other, and a top wall 31B that exists between the pair of side walls 32B, 33B. A shaft protrusion 38B for pivotally supporting the ends of the pair of legs 63B is provided on the wall 31B and protrudes from the top wall 31B. Further, the spring biasing protrusions 37B (biasing protrusions) protrude from the respective shaft protrusions 38B, and the pair of legs 63B are each pressed by the spring biasing protrusions 37B (biasing protrusions). be done.

Therefore, the pair of legs 63B can be rotated to close each other when climbing over the top portion 37Ba of the spring biasing convex part 37B (biasing convex part). 63B or the tip abutting portion 64B (main deformable portion) can be flexibly deformed. Therefore, although the engagement and disengagement spring 60B (disengagement stopper) has a simple configuration, when climbing over the top portion 37Ba, 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 done. Therefore, switching of the engagement/disengagement spring 60B (engagement/disengagement stopper) between the engagement position and the upright (neutral) position is made clear. Therefore, it is possible to prevent the locking/disengaging spring 60B (locking/disengaging stopper) from rotating unintentionally from the locking position.

[Third embodiment]
Hereinafter, a hook latch retaining mechanism 100C and a hook 10 including the hook latch retaining mechanism 100C according to a third embodiment of the present invention will be described based on the drawings. Note that in this embodiment, the same components as those in the first embodiment described above will be described using the same reference numerals.

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

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

As shown in FIGS. 12 to 14, in the hook latch 30C of this embodiment, the shaft hole 36C formed in the side wall 32C and the shaft hole 36C formed in the side wall 33C are arranged in the width direction (Y direction). They are not placed on the same straight line but at different positions. In the following description, the shaft hole 36C provided in the side wall 32C will be referred to as a first shaft hole 36C1, and the shaft hole 36C provided in the side wall 33 will be referred to as a second shaft hole 36C2. These first shaft hole 36C1 and second shaft hole 36C2 constitute a hook detachment prevention mechanism 100C together with a later-described engagement/disengagement spring 60C.

Note that 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 offset significantly, but are offset within a range in which each shaft portion 61C, which will be described later, can be inserted satisfactorily. Further, an axis L connecting the center of the first shaft hole 36C1 and the center of the second shaft hole 36C2 is provided to intersect with the ceiling wall 31C at a predetermined angle θ. This angle θ may be 90 degrees, or may be any appropriate angle other than 90 degrees. Note that the first shaft hole 36C1 and the second shaft hole 36C2 having such a positional relationship correspond to a deformation acting part and a posture transition part.

Next, the engagement/disengagement spring 60C will be explained. As shown in FIG. 14, the engagement/disengagement spring 60C is a member that rotates with respect to the hook latch 30C using the first shaft hole 36C1 and the second shaft hole 36C2 described above as fulcrums. At one end of this rotation, the engagement/disengagement spring 60C is engaged with the hook tip 22. This 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, the first shaft portion 61C1 can be deeply inserted into the first shaft hole 36C1, and thus serves as a reference when the engagement/disengagement spring 60C rotates. On the other hand, the second shaft portion 61C2 is inserted not so deeply (shallowly) into the second shaft hole 36C2. Therefore, as will be described later, even if the tip contact portion 64C is deformed to reduce its diameter (the engagement/disengagement spring 60C is deformed torsionally), the rotation of the engagement/disengagement spring 60C is stabilized. The configuration allows for the following.

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

Here, when no biasing force is applied to the engagement/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 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 inserted into the first shaft hole 36C1 and the second shaft hole 36C2, which are in an offset positional relationship as shown in FIGS. 13(A) and 13(B), respectively. When inserted, a predetermined biasing force is generated on the engagement/disengagement spring 60C. The direction of this biasing force is such that the tip abutting portion 64C of the engagement/disengagement spring 60C can be pressed against the hook tip 22 (ie, counterclockwise in FIG. 12).

However, when the distal end contact portion 64C of the disengagement spring 60C is engaged with the hook distal end 22 as shown in FIG. It may also be a state in which no biasing force is generated. In this case, when the engaging/disengaging spring 60C is rotated clockwise from the position of the engaging/disengaging spring 60C shown in FIG. arise.

Further, the engagement/disengagement spring 60C is provided with a tip contact portion 64C. As shown in FIG. 12, the tip abutting portion 64C is a portion that abuts the hook tip 22 of the hook body 20. In this embodiment, the tip abutting portion 64C is designed to draw one or more spirals. (in a loop). Note that a hollow portion located inside the spiral (loop-shaped) tip contact portion 64C is defined as a loop hole 64C1. The hook tip 22 is inserted into the loop hole 64C1.

In addition, a leg portion 63C (hereinafter referred to as the first leg portion 63C1 as necessary) is attached so as to connect the end of the tip abutting portion 64C on one side (Y1 side) in the width direction and the first shaft portion 61C1. ) is provided. Similarly, the leg portion 63C (hereinafter referred to as the second leg portion 63C2 as needed) is connected so as to connect the end of the other widthwise side (Y2 side) of the tip abutting portion 64C 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 the action>
The operation of the hook 10 and the hook detachment prevention mechanism 100C having the above configuration will be explained below.

As shown in FIG. 12, when the tip abutting portion 64C is in the locking position where it is locked to the hook tip 22, the urging force of the locking and disengaging spring 60C in the counterclockwise direction in FIG. 60C, or a state in which no biasing force is generated in either the counterclockwise or clockwise direction.

From this state, the engagement/disengagement spring 60C is rotated clockwise in FIG. 12 to stand up (neutral) so that the first leg 63C1 and the second leg 63C2 overlap when the engagement/disengagement spring 60C is viewed from the side. When rotated to the position, a large biasing force is stored in the engagement/disengagement spring 60C. This situation will be explained based on 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 locking/disengaging spring 60C is located at the locking position as shown in FIG. 12. 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 in the upright (neutral) position. Further, FIG. 17 is a plan view showing the shape of the engagement and disengagement spring 60C when the engagement and disengagement spring 60C is in the upright (neutral) position.

When the locking and disengaging spring 60C rotates from the locking position shown in FIG. 15 to the upright (neutral) position shown in FIG. 16, the relative positions of the first leg 63C1 and the second leg 63C2 change. 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 extending direction of the first leg portion 63C1 in FIG. 15 . However, in FIG. 16, the position of the second shaft portion 61C2 overlaps with the extending direction of the first leg portion 63C1. In addition, 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 viewed from above, the engagement/disengagement spring 60C has a shape as shown in FIG. 17. That is, due to the relative position 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, the tip contact portion 64C is forcibly deformed, and the loop hole 64C1 is in a reduced diameter state. Note that, depending on the positional relationship with respect to the side wall 32C and the side wall 33C, at least one of the first leg portion 63C1 and the second leg portion 63C2 may bend or incline in a manner other than that shown in FIG. 17. Such deformations may occur.

In such a diameter-reduced state of the loop hole 64C1, in the vicinity of the tip abutting portion 64C centered on the loop hole 64C1 (near the area A surrounded by the dashed line in FIG. 17) of the engagement/disengagement spring 60C, A large spring force (biasing force) that eliminates the diameter reduction of the loop hole 64C1 is stored. However, when the engagement and disengagement spring 60C is located in the upright position corresponding to FIG. 1, the engagement and disengagement spring 60C is located in an independent position. Therefore, unless an external force is applied to the engagement and disengagement spring 60C, the engagement and disengagement spring 60C does not rotate toward either the hook tip 22 side or the side away from the hook tip 22.

Here, the engagement and disengagement spring 60C is slightly rotated toward the hook tip 22 side from the state where the engagement and disengagement spring 60C is located in the above-mentioned upright (neutral) position. Then, a large biasing force that eliminates the diameter reduction state of the tip contact portion 64C acts, and the locking/disengaging spring 60C rotates from the upright (neutral) position to the locking position as shown in FIG. try to. At this time, when the hand holding the locking and disengaging spring 60C is released, the locking and disengaging spring 60C rotates by its own biasing force and is located at the locking position as shown in FIG. 12. The locking and disengaging spring 60C can maintain the locked state in which the tip abutting portion 64C is in contact with the hook tip 22 by its own biasing force.

On the other hand, when the engaging/disengaging spring 60C is rotated slightly away from the hook tip 22 from the above-mentioned upright (neutral) position, the tip abutting portion 64C is contracted. A large urging force acts to eliminate the diameter condition. Therefore, the engagement/disengagement spring 60C attempts to rotate from the upright (neutral) position to the release position (position corresponding to FIG. 8) on the opposite side of the hook tip 22. At this time, when the hand holding the engagement and disengagement spring 60C is released, the engagement and disengagement spring 60C rotates by its own biasing force and is located at the above-mentioned release position. The engagement and disengagement spring 60C can maintain the disengaged state in which the distal end abutting portion 64C is located on the opposite side (Z1 side; upper side) from the hook distal end 22 by its own biasing force.

<About effects>
In the hook 10 and the hook latch retaining mechanism 100C configured as described above, the engagement spring 60C (engagement/disengagement stopper) comes into contact with the hook tip 22, and when the engagement/disengagement spring 60C (engagement/disengagement stopper) rotates. A tip contact portion 64C (main deformation portion) where the largest elastic deformation occurs is provided. In addition, when the hook latch 30C (engagement/disengagement stopper) is located in the upright position, the tip of the hook latch 30C is in contact with the tip more than when it is in the overturned position (first overturned position or second overturned position). A first axial hole 36C1 and a second axial hole 36C2 (deformation action section) are provided to cause large elastic deformation to the portion 64C (main deformation section). Furthermore, the first shaft hole 36C1 and the second shaft hole 36C2 also serve as a posture transition section. That is, the first shaft hole 36C1 and the second shaft hole 36C2 (posture transition portion) are arranged so that the engagement/disengagement spring 60C (engagement/disengagement stopper) is in the upright position, the overturned position (locked position (first overturned position)) or the released position ( When the disengagement spring 60C (engagement/disengagement stopper) is located between the inversion position (locking position (first inversion position)), the restoring force from the tip contact portion 64C (main deformation part) position) or the release position (second overturning position)).

Therefore, in this embodiment as well, similarly to the configurations in the first and second embodiments described above, when the tip contact portion 64C (locking/disengaging stopper) is located at the locking position, the wire 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. Moreover, the hook latch release prevention mechanism 100C has a small number of parts and can have a simple structure.

Furthermore, when the engagement/disengagement spring 60C (engagement/disengagement stopper) is slightly rotated from the upright (neutral) position toward the hook tip 22 side, the first shaft hole 36C1 ( The first shaft portion 61C1) and the second shaft hole 36C2 (second shaft portion 61C2) are about to transition from the positional relationship shown in FIG. 17 to the positional relationship shown in FIG. 14. At this time, the locking/disengaging spring 60C (locking/disengaging stopper) can be rotated toward the locking position, and the hook tip 22 can lock the tip abutting portion 64C. Moreover, as long as the center of the tip abutting portion 64C does not exceed the axis L in the rotating direction of the engagement spring 60C, the engagement spring 60C (disengagement stopper) cannot maintain the state in which it is located at the engagement position. can.

Furthermore, by rotating the engagement/disengagement spring 60C from the upright (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) from the hook tip 22 is maintained. be able to. At this time as well, as long as the center of the tip abutting portion 64C does not exceed the axis L, the engagement/disengagement spring 60C (disengagement stopper) can be maintained at the release position.

Further, in this embodiment, a first shaft hole 36C1 is provided in one side wall 32C of the hook latch 30C, and a second shaft hole 36C2 is provided in the other side wall 33C of the hook latch 30C. Further, the engagement/disengagement spring 60C (disengagement stopper) has a first shaft portion 61C1 inserted into the first shaft hole 36C1, a second shaft portion 61C2 inserted into the second shaft hole 36C2, and a tip contact portion 64C (main a first leg portion 63C1 that connects the deformed portion) and the first shaft portion 61C1, and a second leg portion 63C2 that connects the tip contact portion 64C (main deformable portion) and the second shaft portion 61C2. is provided, and when the hook latch 30C is viewed from the side, the axis L connecting the center of the first shaft portion 61C1 and the center of the second shaft portion 61C2 is such that the tip contact portion 64C (main deformation portion) When in contact with the tip 22, the extending direction of the first leg portion 63C1 and the extending direction of the second leg portion 63C2 intersect.

Therefore, by slightly rotating the center of the tip abutting portion 64C from the state where it exists on the axis L toward the hook tip 22 side, the engagement spring 60C can be attached to the tip abutting portion 64C (main deformable portion). It becomes possible to switch from the standing (neutral) position to the locked position by using force (restoring force). In addition, by slightly rotating the center of the tip abutting portion 64C from the state on the axis L to the side opposite to the hook tip 22, the engagement/disengagement spring 60C becomes the tip abutting portion 64C (main deformation portion). It becomes possible to switch from the standing (neutral) position to the released position by using the biasing force (restoring force) of. Moreover, the state in which the locking and disengaging spring 60C is located at the locking position can be maintained by using the urging force generated in the locking and disengaging spring 60C (locking and disengaging stopper). Moreover, the state in which the engagement and disengagement spring 60C is located at the release position can be maintained by using the urging force generated in the engagement and disengagement spring 60C (disengagement stopper).

Further, in this embodiment, the engagement/disengagement spring 60C (engagement/disengagement stopper) is formed from the wire rod 60a having spring properties, and the tip abutting section 64C (main deformation section) is formed by winding the wire rod 60a into a loop shape. It is formed by turning. Therefore, in the loop-shaped tip contact portion 64C (main deformation portion), a large biasing force can be generated by reducing the diameter. Thereby, the locking and disengaging spring 60C can be switched from the standing (neutral) position to the locking position by using the urging force (restoring force) of the tip abutting part 64C (main deformation part), and can also be switched from the standing (neutral) position to the locking position. It becomes possible to switch from the neutral) position to the release position.

<Modified example>
Although each embodiment of the present invention has been described above, the present invention can be modified in various other ways. This will be discussed below.

In the third embodiment described above, the first shaft hole 36 and the second shaft hole 36C2 are provided separately. However, it is also possible to provide an elongated shaft hole in which the first shaft hole 36 and the second shaft hole 36C2 are integrated. An example of such a configuration is shown in FIG. FIG. 18 is a side view showing a hook latch 30D according to a modification of the present invention. In the configuration shown in FIG. 18, the hook latch 30D on which the engagement/disengagement spring 60C is supported has a top wall 31D similar to the top wall 31, side walls 32D and 33D similar to the side walls 32 and 33, and a shaft support hole 34. A shaft support hole 34D and a tip 35D similar to the tip 35 are provided.

In the configuration shown in FIG. 18, an elongated shaft hole 39D is provided so as to penetrate through the side wall 32D and the side wall 33D. Note that the shaft elongated hole 39D corresponds to a deformation acting part and a posture transition part. The shaft hole 39D is an elongated 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 if the hook latch 30D has the long shaft hole 39D, the locking and disengaging spring 60C can be placed in the locking position shown in FIG. 1, the upright (neutral) position shown in FIG. 4, and the release position shown in FIG. It can be located in any position.

Moreover, 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 becomes easier to assemble to the hook latch 30D.

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

Further, in each of the above-described embodiments, the engagement and disengagement springs 60, 60B, and 60C made of the wire rod 60a are described as the engagement and disengagement stoppers. However, the engagement and disengagement stopper is not limited to the engagement and disengagement springs 60, 60B, and 60C made of the wire rod 60a. For example, an axial spring, a spiral spring, or a disc spring may be used for the tip abutting portion. Furthermore, any type of engagement/disengagement stopper may be used as long as it generates an urging force due to a change in the position of the second shaft hole 36C2 relative to the first shaft hole 36 when the engagement/disengagement stopper rotates. Also good. For example, a planar spring may be used, or a combination of one or more S springs may be used, or a part of the figure-eight wire may be cut out, and the vicinity of the cut out portion may be used as the shaft. Anything is fine.

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

10...Hook, 20...Hook body, 21...Mounting hole, 22...Hook tip, 23...Shaft hole, 24...Movement prevention wall, 30, 30B, 30C, 30D...Hook latch, 31, 31B, 31C, 31D...Top 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 Hole, 36C1...First shaft hole (corresponding to the deformation action part and posture transition part), 36C2...Second shaft hole (corresponding to the deformation action part and posture transition part), 37, 37B...Spring biased convex part (deformation action part) ), 37a, 37Ba...Top portion, 37b, 37Bb...Slanted portion (corresponding to posture transition part), 38B...Shaft protrusion, 39B...Opening, 39D...Shaft elongated hole, 40... Rotation shaft, 50... Latch biasing spring, 60, 60B, 60C, 60D... Engagement/disengagement spring (corresponding to engagement/disengagement stopper), 60a... Wire rod, 61, 61B... Shaft portion, 61C1... First shaft portion, 61C2... Second shaft part, 63, 63B... Leg part (corresponding to the main deformation part), 63C... Leg part, 63C1... First leg part, 63C2... Second leg part, 64, 64B... Tip contact part, 64C ...Tip abutting part (corresponding to the main deformation part), 64C1...Loop hole, 100, 100B, 100C...Hook latch retaining mechanism, A...area, S1...closed space, S2...gap, L...axis

Claims (8)

A hook latch retaining mechanism that prevents a hook latch rotatably provided on a hook body and biased to close a hook opening from rotating away from a hook tip of the hook body. hand,
an engagement/disengagement stopper formed of a member having spring properties and rotatably attached to the hook latch;
The engagement/disengagement stopper rotates with respect to the hook latch between a first overturned position away from the rotational fulcrum of the hook latch , and a second upright position on the side of the rotational fulcrum. installed so that it is possible to
The engagement/disengagement stopper is provided with a main deformation portion that undergoes elastic deformation as the engagement/disengagement stopper rotates;
The hook latch is provided with a deformation acting portion that causes a larger elastic deformation to the main deformation portion when the engagement/disengagement stopper is located at the upright position than when it is located at any of the overturned positions. I was being treated,
Furthermore, when the hook latch is located between the upright position and the first overturning position and between the upright position and the second overturning position, the hook latch is provided with a A posture transition portion is provided for shifting the engaging/disengaging stopper to any of the overturning positions by a restoring force;
A hook latch release prevention mechanism characterized by: The hook latch release prevention mechanism according to claim 1,
The engagement/disengagement stopper is provided with a leg portion extending from the main deformation portion toward the hook latch,
The deformation acting part is a biasing convex part that presses the leg part and elastically deforms the leg part or the main deformation part.
A hook latch release prevention mechanism characterized by: The hook latch release prevention mechanism according to claim 2,
The hook latch is provided with a pair of side walls facing each other, and
The biasing protrusion protrudes from each of the side walls,
The pair of leg portions are each pressed by the biasing convex portion,
A hook latch release prevention mechanism characterized by: The hook latch release 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, and
A shaft protrusion for pivotally supporting the ends of the pair of legs is provided on the ceiling wall and projects from the ceiling wall,
The biasing protrusion protrudes from each of the shaft protrusions,
The pair of leg portions are each pressed by the biasing convex portion,
A hook latch release prevention mechanism characterized by: The hook latch release prevention mechanism according to claim 1,
The hook latch is provided with a pair of side walls facing each other, and
A first shaft hole is provided in one of the side walls of the hook latch, and a second shaft hole is provided in the other side wall of the hook latch,
The engagement/disengagement stopper connects a first shaft portion inserted into the first shaft hole, a second shaft portion inserted into the second shaft hole, and the main deformation portion and the first shaft portion. A first leg portion and a second leg portion connecting the main deformation 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 axial hole and the center of the second axial hole is the same as that of the first leg when the main deformable portion is in contact with the tip of the hook. intersects the stretching direction of the second leg and the stretching direction of the second leg,
A hook latch release prevention mechanism characterized by: The hook latch release prevention mechanism according to claim 1,
The hook latch is provided with a pair of side walls facing each other, and
An elongated shaft-shaped elongated hole is provided in one of the side walls and the other side wall of the hook latch,
The engagement/disengagement stopper includes a first shaft portion that is inserted into the elongated shaft hole of one of the side walls, a second shaft portion that is inserted into the elongated shaft hole of the other side wall, and the main deformation portion. A first leg portion that connects the first shaft portion and a second leg portion that connects the main deformation portion and the second shaft portion are provided,
When the hook latch is viewed from the side, the longitudinal direction of the shaft elongated hole is in the extending direction of the first leg portion and the extending direction of the second leg portion when the main deformation portion is in contact with the tip of the hook. intersects with the direction
A hook latch release prevention mechanism characterized by: The hook latch release prevention mechanism according to any one of claims 1 to 6,
The main deformation part is formed by winding a wire into a loop shape,
A hook latch release prevention mechanism characterized by: A hook comprising a hook body and a hook latch rotatably provided on the hook body,
a hook latch retaining mechanism that prevents the hook latch from rotating away from the hook tip of the hook body;
The hook latch disengagement prevention mechanism is formed of a member having spring properties and includes an engagement/disengagement stopper rotatably attached to the hook latch,
The engagement/disengagement stopper rotates with respect to the hook latch between a first overturned position away from the rotational fulcrum of the hook latch , and a second upright position on the side of the rotational fulcrum. installed so that it is possible to
The engagement/disengagement stopper is provided with a main deformation portion that undergoes elastic deformation as the engagement/disengagement stopper rotates;
The hook latch is provided with a deformation acting portion that causes a larger elastic deformation to the main deformation portion when the engagement/disengagement stopper is located at the upright position than when it is located at any of the overturned positions. I was being treated,
Furthermore, when the hook latch is located between the upright position and the first overturning position and between the upright position and the second overturning position, the hook latch is provided with a A posture transition portion is provided for shifting the engaging/disengaging stopper to any of the overturning positions by a restoring force;
A hook characterized by:

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