JP6227919B2 - Hook release prevention device - Google Patents

Description

  The present invention relates to a hook detachment preventing device that prevents a wire rope hung on a crane hook from being unexpectedly detached.

  As shown in FIG. 6, the crane hook 2 is generally provided with a detachment stop 31 that closes the hook 4 so as to be opened and closed. The stopper 31 is formed in a bar shape extending in the vertical direction, and its upper end is rotatably provided on the base 5 on the side of the hook 4 of the crane hook 2, and its lower end contacts the inner end 6 of the crane hook 2. It is urged by a spring (not shown) so as to contact.

  As a result, the locking stopper 31 does not rotate with respect to the force from the inside of the hook 4 of the crane hook 2 but rotates with respect to the force from the outside to open the hook 4. Yes. That is, when the wire rope 3 is slung on the crane hook 2, the locking stopper 31 rotates by the force received from the wire rope 3 and allows the hook 4 to pass from the outside to the inside, and conversely The formed wire rope 3 is prevented from passing through the hook 4 from the inside to the outside and coming off from the crane hook 2.

JP 2001-253679 A

  By the way, in the work currently performed at the construction site etc., there is an operation of hanging a long load 32 such as a rod tube on the crane hook 2 via the wire rope 3 and dropping the long load 32 to the ground. . In this operation, the lower end of the long load 32 is placed on the ground, and the crane hook 2 is lowered while moving and turning the crane. Therefore, the wire rope 3 hung on the crane hook 2 may be loosened in this process.

  At this time, the stopper 31 does not move even if the wire rope 3 hits from the inside, and the wire rope 3 does not come off from the crane hook 2, but rarely the wire rope 3 is attached to the hook 4 of the stopper 31. It is generally known that there is a possibility that a phenomenon called a wisdom wheel phenomenon may occur that moves outward, moves the stopper 31, and comes off the crane hook 2.

  As shown in FIGS. 6 and 7, the wisdom wheel phenomenon means that one side of the crane hook 2 (when the wire rope 3 rises in an unloaded state due to the twisting, rotation, or wind of the wire rope 3 ( Here, the wire rope 3 located on the front side of the paper surface passes over the tip of the crane hook 2 and wraps around the other side of the crane hook 2 (here, the back side of the paper surface), and the wire rope 3 is hung on the outside of the stopper 31. Thus, when the load of the load 32 is again applied to the wire rope 3, the wire rope 3 pushes the release stopper 31 from the outside of the hook 4 of the crane hook 2 and is completely detached from the crane hook 2.

  As a means for preventing the wisdom ring phenomenon, a hook with a safety device described in Patent Document 1 is known. The hook with a safety device is provided with a cover that rotatably covers the tip of the crane hook at the base of the crane hook and a spring that presses the cover against the tip of the crane hook. According to the hook with a safety device, it is considered that the wire rope slung around the crane hook can be prevented from being pushed from the outside of the hook and the occurrence of the wisdom ring phenomenon can be prevented.

  However, the hook with a safety device has a problem in that workability is poor because the cover must be raised with one hand and the slinging work must be performed with the other hand.

  Accordingly, an object of the present invention is to provide a hook detachment prevention device that can prevent the wire rope from coming off the crane hook due to the wisdom wheel phenomenon and that is excellent in workability.

In order to prevent the wire rope hung on the crane hook from coming off, the present invention was devised to achieve this object. The upper end of the present invention is rotatable around an axis extending in the horizontal direction at the base of the hook side of the crane hook. 1 is a hook detent device provided with a detent that is biased by a spring so that the lower end abuts on the inner side of the tip of the crane hook. The detent device is slidable in the longitudinal direction and extends in the horizontal direction. It is provided so as to be pivotable around an axis, and is slid upward along the anti- separation at the time of storage, and is rotated so as to bring the lower end side close to the anti-separation, and overlaps with the anti-detent , hooking tip cover covering said off-hook tip at its lower end is slid downward along the detachment preventing while being rotated so as to separate from the stop A hook the latch apparatus characterized by comprising.

The hook tip cover may be provided with a rotation restricting means for restricting the rotation of the hook tip cover with respect to the detachment stopper when the hook tip cover is slid and deployed to a position in contact with the hook tip.

The hook tip cover may include a groove-shaped cover main body that covers the release stopper when the hook end cover is stacked and stored on the release stopper.

  ADVANTAGE OF THE INVENTION According to this invention, it can prevent that a wire rope remove | deviates from a crane hook by the ring phenomenon of wisdom, and can provide the hook removal prevention apparatus excellent in workability | operativity.

It is a perspective explanatory view of the hook detachment prevention device concerning the present invention, and shows the state where the hook tip cover was developed. It is a perspective explanatory view of a hook detachment prevention device, (a) shows the state removed from the crane hook, (b) shows the detachment prevention with the hook tip cover removed, and (c) shows the hook detachment from the detachment prevention. Show the cover. It is a perspective explanatory view of a hook detachment prevention device concerning the present invention, and shows the state where a hook tip cover was stored. It is explanatory drawing which shows the procedure which expand | deploys the stored hook front-end | tip cover. FIG. 5 is an explanatory diagram showing a continuation procedure of FIG. 4. It is explanatory drawing explaining the ring phenomenon of wisdom. It is explanatory drawing explaining the ring phenomenon of wisdom.

  Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. In the present embodiment, the up and down direction indicates a direction based on the horizontal direction, and is not limited to the vertical direction. For example, the upper part includes an oblique upper part and the lower part includes an oblique lower part.

  As shown in FIGS. 1 and 2 (a), the hook release preventing device 1 according to the present embodiment has an upper end hooked to the crane hook 2 to prevent the wire rope 3 hung from the crane hook 2 from coming off. The base 5 on the side of the mouth 4 is provided so as to be rotatable, and the lower end is provided with a spring 7 biased by a spring so that the lower end abuts against the inner end 6 of the crane hook 2. A hook tip cover 9 which is provided so as to be rotatable and overlaps with the stopper 7 when stored and covers the tip 8 (hereinafter referred to as the hook tip 8) of the crane hook 2 when deployed, and a hook tip cover for the stopper 7 9 and a rotation restricting means 10 for restricting the rotation of 9.

  As shown in FIGS. 1, 2 (a) and 2 (b), the stopper 7 is formed in a rod shape having a cross-sectional groove shape. That is, the stopper 7 includes a central plate portion 11 that forms a groove-shaped bottom portion, and a pair of side plate portions 12 that are provided on both the left and right sides of the central plate portion 11 and form a groove-shaped side portion.

  The center plate part 11 is formed in a substantially rectangular shape in which the dimension between the upper end and the lower end is longer than the dimension in the width direction. Further, a cutout portion 13 is formed at the lower end of the central plate portion 11, which is cut out in an arc shape along the tip inner side portion 6 of the crane hook 2.

  The side plate portion 12 is provided so as to protrude downward on both the left and right sides of the central plate portion 11. That is, the stopper 7 is disposed so that the groove-shaped opening is directed downward. Further, the side plate portion 12 includes a shaft support portion 14 that is pivotally supported by the base portion 5 of the crane hook 2 and a guide groove 15 for guiding the hook tip cover 9. The shaft support 14 is formed with a shaft hole 17 through which a support shaft 16 provided on the base 5 of the crane hook 2 is rotatably inserted.

  The guide groove 15 extends in a straight line in the vertical direction in parallel with the center plate portion 11, and is bent from the upper end of the development groove portion 18 and linearly extends in a direction away from the center plate portion 11. A transition groove 19 and a storage groove 20 that is bent from the inner upper end (extension end) of the transition groove 19 and extends downward are provided. Further, the guide groove 15 is formed through the side plate portion 12 in the left and right side plate portions 12.

  As shown in FIGS. 1 and 2C, the hook tip cover 9 includes a cover main body 21 and a guide rod 22 provided in the cover main body 21 and slidably and rotatably guided in the guide groove 15. Prepare.

  The cover body 21 is formed in a groove shape that covers the stopper 7 when it is superimposed on the stopper 7. That is, the cover main body 21 constitutes a groove-shaped bottom part and covers the central plate part 11, and is provided on both the left and right sides of the main cover part 23 to form groove-shaped side parts and covers the side plate part 12. A pair of sub-cover portions 24. The main cover portion 23 is configured to cover the hook distal end portion 8 with a front end portion 25 located on the distal end side of the crane hook 2.

  The guide rod 22 is made of round steel having a circular cross section, and is provided so as to span between the sub cover portions 24. The guide rods 22 are inserted into the guide grooves 15 of the respective side plate portions 12, can move along the guide grooves 15, and can rotate within the guide grooves 15. The guide rod 22 is positioned near the lower end of the developing groove 18 when the hook tip cover 9 covers the hook tip 8. Further, the guide rod 22 is disposed so that the hook tip cover 9 is stored on the stopper 7 when it is moved to the storing groove 20.

  In addition, the guide rod 22 may be divided into left and right so as to extend from the respective sub-cover portions 24 toward the detachment stop 7 side. In this case, the guide groove 15 may not penetrate the side plate portion 12.

  As shown in FIG. 2A, the rotation restricting means 10 restricts the rotation of the hook tip cover 9 relative to the stopper 7 when the hook tip cover 9 covers the hook tip 8. The rotation restricting means 10 is provided on the side plate portions 12 on both the left and right sides of the stopper 7 so as to protrude to the side plate portion 12 and on the sub cover portion 24 of the hook tip cover 9. And an inner pin 28 that is guided by the restricting projection 27 when the hook tip cover 9 covers the hook tip 8. The restricting convex portion 27 is formed to extend in the longitudinal direction of the developing groove portion 18, and guides the inner pin 28 over a predetermined slide length when the hook tip cover 9 slides along the developing groove portion 18. It is supposed to be. Further, the regulating convex portion 27 is formed along the edge on the opposite side to the central plate portion 11 side of both edges of the developing groove portion 18. The restricting convex portion 27 is formed such that the protruding end guides the sub cover portion 24 of the cover main body 21. The inner pin 28 is provided so as to protrude inwardly (on the side plate portion 12 side) to the sub cover portion 24 on the opposite side (rear end side) from the front end portion 25 with the guide rod 22 as a boundary. The inner pin 28 is formed in a circular cross section, and its outer peripheral surface comes into contact with the restricting convex portion 27. The inner pin 28 comes into contact with the lower end of the restricting convex portion 27 when the hook tip cover 9 covers the hook tip 8.

  Further, as shown in FIGS. 2A and 2B, the side plate portion 12 is provided with a posture stabilizing protrusion for guiding the sub cover portion 24 of the cover main body 21 to stabilize the posture of the cover main body 21. A portion 29 is provided. The posture stabilizing convex portion 29 is formed so as to extend along the edge on the central plate portion 11 side of both edges of the developing groove portion 18. The posture stabilizing convex portion 29 is configured such that the protruding end guides the sub cover portion 24 and guides the sub cover portion 24 together with the regulating convex portion 27 to stabilize the posture of the cover main body 21.

  Next, the operation of this embodiment will be described.

As shown in FIG. 3, when the wire rope 3 is hanged on the crane hook 2, the hook tip cover 9 is previously placed on the stopper 7 and stored, and the main cover portion 23 of the hook tip cover 9 or The wire rope 3 is pressed against the central plate portion 11 of the stopper 7 from the hook tip side of the hook 4 toward the hook center. As a result, the stopper 7 that overlaps the hook tip cover 9 rotates in the direction away from the hook tip 8 about the support shaft 16 ( downward ), so that the wire rope 3 passes through the hook 4 and the crane hook 2 It is hung on the sling 30. When the wire rope 3 passes through the hook 4, the stopper 7 returns to the original posture by the biasing force of the spring. The wire rope 3 can be easily hung on the crane hook 2 by simply pressing the wire rope 3 against the hook tip cover 9 or the stopper 7.

  When the wire rope 3 is slung, the hook tip cover 9 is unfolded according to the procedure shown in FIGS.

  As shown in FIG. 4A, the guide rod 22 of the stored hook tip cover 9 is positioned in the storing groove 20. Further, the inner pin 28 is not in contact with other members such as the stopper 7 and does not restrict the movement of the hook tip cover 9. The inner pin 28 is positioned between the side plate portion 12 of the stopper 7 and the auxiliary cover portion 24 of the hook tip cover 9.

  As shown in FIG. 4B, first, the hook tip cover 9 is slid upward along the stopper 7. As a result, the guide rod 22 is moved from the storage groove 20 into the transition groove 19.

  Next, as shown in FIG. 4C, the main cover portion 23 of the hook tip cover 9 is slid in a direction away from the central plate portion 11 of the stopper 7. The guide rod 22 is moved from the transition groove 19 into the deployment groove 18.

  Thereafter, as shown in FIG. 5 (d), the front side of the hook tip cover 9 is rotated about the guide rod 22 in a direction away from the detachment stopper 7. At this time, since the rear end 26 of the main cover portion 23 is offset toward the front end side relative to the sub cover portion 24, the rear end 26 of the main cover portion 23 abuts against the stopper 7 and the hook front end cover 9 rotates. It does not disturb the movement.

  As shown in FIG. 5E, the hook tip cover 9 is slid to the tip side (downward) while maintaining the posture. As a result, the guide rod 22 is moved to the distal end side along the development groove 18. The inner pin 28 has an outer peripheral surface in contact with an edge far from the developing groove 18 out of both edges extending in the longitudinal direction of the restricting convex portion 27, and the inner pin 28 rotates upward with the guide rod 22 as the center. Movement is regulated. The hook tip cover 9 is brought into contact with the hook tip portion 8 so that downward sliding is restricted. At this time, the inner pin 28 is restricted from turning upward by the restricting convex portion 27. For this reason, the hook tip cover 9 is not rotated by its own weight or the like, and the hook tip cover 9 is held in a predetermined posture.

  As shown in FIG. 1, since the hook tip cover 9 covers the hook tip 8, the wire rope 3 positioned on one side of the crane hook 2 gets over the hook tip 8 and wraps around the other side of the crane hook 2. Even so, the wire rope 3 does not push the stopper 7 from the outside and does not come off the crane hook 2.

  Thus, in order to prevent the wire rope 3 hung on the crane hook 2 from coming off, the upper end is rotatably provided at the base 5 on the side of the hook 4 of the crane hook 2, and the lower end is the inside of the tip of the crane hook 2. In a hook release prevention device 1 having a release stop 7 biased by a spring so as to come into contact with the portion 6, the release stop 7 is provided to be slidable in the longitudinal direction and rotatably provided, and the release stop 7 when stored. And the hook tip cover 9 that covers the hook tip 8 during deployment is provided, so that it is possible to prevent the wire rope 3 from being detached from the crane hook 2 due to the wisdom ring phenomenon, and to easily perform the slinging operation. it can.

  Further, since the hook tip cover 9 is provided with the rotation restricting means 10 for restricting the rotation of the hook tip cover 9 with respect to the stopper 7 when the hook tip cover 9 is slid to the position where it abuts against the hook tip 8, the hook tip cover 9 Even when pushed from the wire rope 3, the hook tip cover 9 does not rotate and escape from the wire rope 3, and the occurrence of the wisdom ring phenomenon can be reliably prevented.

  Further, the rotation restricting means 10 protrudes toward the side plate portion 12 on the restricting convex portion 27 provided on the side plate portions 12 on both the left and right sides of the stopper 7 and protruding to the side, and the sub cover portion 24 of the hook tip cover 9. Provided with the inner pin 28 that comes into contact with the restricting convex portion 27 when the hook tip cover 9 covers the hook tip portion 8, the rotation of the hook tip cover 9 can be reliably restricted with a simple structure. . In addition, a particularly high processing accuracy is not required, and it can be manufactured at a low cost.

  Since the hook tip cover 9 is provided with the groove-shaped cover main body 21 that covers the stopper 7 when it is superimposed on the stopper 7, the hook tip cover 9 can be stored integrally with the stopper 7 with a simple structure. Further, a regulating convex portion 27 and a posture stabilizing convex portion 29 are interposed between the side plate portion 12 and the sub cover portion 24, and the hook tip cover is formed to reduce the gap between the side plate portion 12 and the sub cover portion 24. It is possible to prevent the wire rope 3 from being caught between 9 and the stopper 7.

  The rear end 26 of the main cover portion 23 may be in contact with the stopper 7 when the hook tip cover 9 is deployed. The hook tip cover 9 during deployment can be further stabilized.

  Further, the rotation restricting means 10 is not limited to the above. For example, the guide rod 22 is formed in a rectangular cross section having two parallel surfaces, and the two surfaces are formed so as to be in sliding contact with both edges of the developing groove portion 18 to restrict the rotation of the hook tip cover 9. It is good. In this case, a widened portion (not shown) that allows the guide rod to rotate may be formed at the upper end of the developing groove 18.

DESCRIPTION OF SYMBOLS 1 Hook detachment prevention device 2 Crane hook 3 Wire rope 4 Hook 5 Base part 6 Inner tip part 7 Detachment prevention 8 Hook tip part 9 Hook tip cover 10 Rotation restriction means 21 Cover main body

Claims (3)

In order to prevent the wire rope hung from the crane hook from coming off, the upper end of the crane hook is provided at the base on the hook side so that it can rotate around an axis extending in the horizontal direction, and the lower end contacts the inner side of the tip of the crane hook. In a hook release prevention device having a release stop biased by a spring to contact,
The detachment stopper is provided slidably in the longitudinal direction and is provided rotatably about an axis extending in the horizontal direction, and is slid upward along the detachment stopper during storage and the lower end side is brought close to the detachment stopper. It is rotated so that it is overlapped with the detachment stopper, and is rotated so as to separate the lower end side from the detachment stopper when deployed, and is slid downward along the detachment stopper and covers the hook tip at the lower end side. A hook release prevention device comprising a hook tip cover. The hook disengagement according to claim 1, further comprising a rotation restricting means for restricting the rotation of the hook front end cover with respect to the stopper when the hook front end cover is slid and deployed to a position in contact with the hook front end. Stop device. 3. The hook release prevention device according to claim 1, wherein the hook tip cover includes a groove-shaped cover body that covers the release prevention when the hook end cover is stacked and stored on the release prevention.

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