Automatic locking crane hook

Abstract

The present invention relates to an automatic locking crane hook. A locking lever is provided with a lever body in which a lever hole through which a hook end of a hook body passes and a locking rod which is inserted into or released from a locking hole of the hook body are formed; and a pair of lever connection portions which are inserted into hook hinge shafts of the hook body via elongated holes and supported to be linearly movable. An elastic member for linear movement is deformed to generate a recovery force when the locking lever linearly moves to the outside in the lengthwise direction of the elongated holes. An elastic member for rotation is deformed to generate a recovery force when the locking lever is rotated to a position of opening the entrance of the hook body. A support block is supported to be rotatable and vertically movable relative to the shaft of the hook body. An elastic member for a support block exerts an elastic force onto the support block in the downward direction.

Description

Automatic locking crane hook

[0001] The present invention relates to a crane hook, and more specifically, to a crane hook connected to a chain of a hoist block equipped in a crane and used for transporting heavy objects.

[0002] Generally, stationary cranes are installed and operated at various construction and industrial sites to transport equipment necessary for work to target locations, while mobile cranes are used in places where installing stationary cranes is difficult. These cranes are equipped with a hoist block. A crane hook used for transporting heavy loads is connected to the chain of the hoist block.

[0003] A crane hook has a slot in the hook body to attach a wire rope or towing hook connected to a heavy load. A locking lever is installed in the hook body to open and close the entrance of the slot. The locking lever locks to the hook body while keeping the entrance of the slot closed to prevent the wire rope or towing hook from detaching from the slot during the transport of the heavy load.

[0004] According to conventional crane hooks, a user manually inserts a wire rope or towing hook into the insertion space of the hook body and operates the locking lever. However, depending on the volume and height of the heavy load or the working environment, if the wire rope or towing hook above the load is located out of reach or inaccessible to the user, the user may be unable to operate the crane hook by hand. Countermeasures for this are required.

[0005] The objective of the present invention is to provide an automatic locking crane hook that can be conveniently used regardless of the volume and height of the heavy object or the working environment.

[0006] An automatic locking crane hook according to the present invention for achieving the above objectives comprises a hook body, a locking lever, an elastic member for linear movement, an elastic member for rotation, a support block, and an elastic member for the support block.

[0007] The hook body extends downward in a bent shape from the upper part of the hook to form a fitting space, an entrance is formed between the extended hook end and the upper part of the hook, a locking groove is formed on the outer side of the hook end, hook hinge shafts are formed protruding horizontally from the left and right sides of the upper part of the hook, and a shaft extends upward from the upper part of the hook.

[0008] The locking lever comprises a lever body having a lever hole formed to pass through a hook end and a locking rod formed around the outer periphery of the lever hole that is inserted into or separated from the locking groove, and a pair of lever connecting parts that extend from the lever body spaced apart from each other and are inserted into hook hinge axes through elongated holes to be supported so as to be rotatable and linearly movable.

[0009] The linear movement elastic member is mounted on the hook body and the locking lever, and deforms to generate a restoring force when the locking lever moves linearly outward along the length of the slots. The rotational elastic member is mounted on the hook body and the locking lever, and deforms to generate a restoring force when the locking lever rotates to a position that opens the entrance of the hook body.

[0010] The support block is supported so that the shaft is inserted into the hollow through the lower opening, allowing it to rotate and move up and down relative to the shaft. An elastic member for the support block is mounted between the support block and the shaft to apply a downward elastic force to the support block, and when the locking lever is maintained in a linearly outwardly moved state and rotates to reach the open position, the lever connecting parts are pressed against the bottom of the support block to maintain the position of the locking lever.

[0011] In an additional aspect, the automatic locking crane hook according to the present invention may include a latch groove formed on the inner side of the hook end, a lever hinge shaft installed in the lever body across the lever hole in the left-right direction, a latch fitted onto the lever hinge shaft and fitted into or separated from the latch groove as it rotates within the lever hole, and an elastic member for the latch mounted between the latch and the lever body that deforms when the latch is separated from the latch groove to generate a restoring force.

[0012] The automatic locking crane hook of the present invention can be conveniently used even when the wire rope or towing hook on the upper side of the heavy object is located out of reach of the user's hand or inaccessible, depending on the volume and height of the heavy object or the working environment.

[0013] FIG. 1 is a perspective view of an automatic locking crane hook according to one embodiment of the present invention.

[0014] Figure 2 is a perspective view showing a portion of Figure 1.

[0015] FIG. 3 is a perspective view showing the area in FIG. 1 where a latch is mounted on the locking lever.

[0016] FIG. 4 is a perspective view showing the state in which the locking lever has moved to the open position.

[0017] Fig. 5 is a longitudinal section of Fig. 4.

[0018] FIG. 6 is a perspective view showing the state before the locking lever is released from the support block and reaches the closed position.

[0019] FIG. 7 is a perspective view showing the state in which the locking lever is locked in the closed position.

[0020] FIG. 8 is a perspective view showing an elastic member for a support block of another example mounted within the support block.

[0021] The present invention will be described in detail below with reference to the attached drawings. Here, the same reference numerals are used for identical components, and repetitive descriptions and detailed descriptions of known functions and components that could unnecessarily obscure the essence of the invention are omitted.

[0022] The embodiments of the present invention are provided to more fully explain the invention to those with average knowledge in the art. Accordingly, the shapes and sizes of the elements in the drawings may be exaggerated for clearer explanation.

[0023] FIG. 1 is a perspective view of an automatic locking crane hook according to an embodiment of the present invention. FIG. 2 is a perspective view showing a portion of FIG. 1. FIG. 3 is a perspective view showing an area in FIG. 1 where a latch is mounted on the locking lever. FIG. 4 is a perspective view showing the state in which the locking lever has moved to an open position. FIG. 5 is a longitudinal cross-sectional view of FIG. 4. FIG. 6 is a perspective view showing the state before the locking lever is released from the support block and reaches the closed position. FIG. 7 is a perspective view showing the state in which the locking lever is locked in the closed position.

[0024] Referring to FIGS. 1 to 7, an automatic locking crane hook (100) according to one embodiment of the present invention comprises a hook body (110), a locking lever (120), an elastic member for linear movement (130), an elastic member for rotation (140), a support block (150), and an elastic member for the support block (160).

[0025] The hook body (110) extends downward in a bent shape from the upper part of the hook (111) to form a fitting space. An opening is formed between the extended hook end (112) and the upper part of the hook (111) of the hook body (110). The hook body (110) may be formed in a roughly C-shape. The hook body (110) can be hung by inserting a wire rope or a towing hook connected to a heavy object into the fitting space through the opening.

[0026] A locking groove (113) is formed on the outer side of the hook end (112) of the hook body (110). The locking groove (113) is formed to allow the locking rod (123) of the locking lever (120) to be inserted. The locking groove (113) may be formed with the left and right sides open.

[0027] Hook body (110) has hook hinge shafts (114) formed that protrude horizontally from the left and right sides of the hook upper portion (111). The hook hinge shafts (114) are formed so that they can be inserted into the elongated holes (127) of the lever connecting portions (126). A shaft (115) extends upward from the hook upper portion (111) of the hook body (110).

[0028] The locking lever (120) comprises a lever body (121) and a pair of lever connecting parts (126). The lever body (121) has a lever hole (122) formed therein for passing a hook end (112). The lever body (121) has a locking rod (123) formed around the outer edge of the lever hole (122) that is inserted into or separated from the locking groove (113).

[0029] When the locking lever (120) is opened or closed, the lever body (121) passes the hook end (112) through the lever hole (122), causing the locking rod (123) to be inserted into or separated from the locking groove (113) on the outside of the hook end (112). The lever body (121) may be formed with a constricted shape on the left and right sides. The user can easily operate the locking lever (120) by grasping the constricted parts of the lever body (121) with their fingers.

[0030] A pair of lever connecting parts (126) extend from the lever body (121) so as to be spaced apart from each other. The lever connecting parts (126) are fitted onto hook hinge axes (114) through elongated holes (127) and supported so as to be rotatable and linearly movable.

[0031] When the lever connecting parts (126) are linearly moved inward and the hook hinge shafts (114) are positioned at the front edges of the elongated holes (127), the locking rod (123) of the lever body (121) is fitted into the locking groove (113) on the outside of the hook end (112).

[0032] When the lever connecting parts (126) are linearly moved outward so that the hook hinge shafts (114) are positioned at the rear edges of the elongated holes (127), the locking rod (123) of the lever body (121) is separated from the locking groove (113) on the outside of the hook end (112).

[0033] The linear movement elastic member (130) is mounted on the hook body (110) and the locking lever (120) and deforms to generate a restoring force when the locking lever (120) moves linearly outward along the length direction of the elongated holes (127). The linear movement elastic member (130) enables the locking lever (120) to return to its original position by the restoring force when the external force applied to the locking lever (120) along the length direction of the elongated holes (127) is removed.

[0034] For example, the linear movement elastic member (130) may be made of a tension spring. One end of the tension spring may be supported by the upper part of the hook (111) and the other end may be supported by the lever body (121) so as to be tensioned when the locking lever (120) moves linearly outward.

[0035] The rotational elastic member (140) is mounted on the hook body (110) and the locking lever (120) and deforms to generate a restoring force when the locking lever (120) rotates to a position that opens the entrance of the hook body (110). The rotational elastic member (140) allows the locking lever (120) to return to its original position by the restoring force when an external force applied to the locking lever (120) in the rotational direction is removed.

[0036] For example, the rotational elastic member (140) may consist of a pair of torsion springs, the first ends (140a) of which are connected to each other. The torsion springs insert the hook hinge shafts (114) into the central spaces to surround the hook hinge shafts (114). The first ends (140a) of the torsion springs connected to each other are supported on the upper end (111) of the hook.

[0037] The torsion springs are supported by inserting the second ends (140b) into spring guide grooves (128) formed on the inner side of the lever connections (126), and move under the guidance of the spring guide grooves (128) according to the linear movement of the lever connections (126).

[0038] As the lever connecting portions (126) move linearly, the second ends (140b) of the torsion springs supported by the lever connecting portions (126) move, so the spring guide grooves (128) guide the second ends (140b) of the torsion springs to move smoothly. The spring guide grooves (128) allow the second ends (140b) of the torsion springs to be easily inserted through the open rear portions.

[0039] The lever connection parts (126) are formed in a protruding shape having spring guide grooves (128), and in the release position, the protruding parts can be restrained by contacting the lower surface of the support block (150).

[0040] The support block (150) supports the shaft (115) by inserting it into the hollow through the lower opening so that it can rotate and move up and down relative to the shaft (115). The upper portion of the support block (150) can be connected to the chain of the hoist block.

[0041] The support block (150) allows the shaft (115) to rotate, thereby enabling the position of the hook body (110) to be adjusted. The support block (150) fixes the locking lever (120) in an open position while in a lowered state relative to the shaft (115), and can raise from this state to release the locking lever (120).

[0042] The support block (150) can be supported rotatably and vertically with respect to the shaft (115) via balls (116), a ball seating groove (152) for the support block, and a ball seating groove (117) for the shaft. The balls (116) are arranged along the outer surface of the shaft (115). The balls (116) smoothly guide the rotation of the support block (150) between the shaft (115) and the support block (150).

[0043] The ball seating groove (152) for the support block is formed along the hollow inner surface of the support block (150) to partially seat the balls (116). The ball seating groove (152) for the support block has a semicircular cross-section and can accommodate approximately half of the balls (116). As the support block (150) moves up and down, the balls (116) seated in the ball seating groove (152) for the support block can be raised and lowered.

[0044] The shaft ball seating groove (117) is formed along the outer surface of the shaft (115) to partially seat the balls (116). Since the shaft ball seating groove (117) has a width that is vertically longer than the diameter of the balls (116), it guides the movement of the balls (116) by the lifting of the hook body (110). The shaft ball seating groove (117) has an arc-shaped cross-section with a radius of curvature larger than the radius of curvature of the balls (116) and can accommodate approximately half of the balls (116). Depending on the size of the radius of curvature of the shaft ball seating groove (117), the distance of the hook body (110) required for fixing and releasing the locking lever (120) can be adjusted.

[0045] As another example, the ball seating groove (152) for the support block has a vertical width longer than the diameter of the ball (116), thereby guiding the lifting of the balls (116) by the lifting of the hook body (110). The ball seating groove (152) for the support block has an arc-shaped cross-section with a radius of curvature larger than the radius of curvature of the ball (116) and can accommodate approximately half of the ball (116). In this case, the ball seating groove (117) for the shaft has a semicircular cross-section and can accommodate approximately half of the ball (116).

[0046] The support block (150) may have a ball injection hole (153) communicating with a ball seating groove (152) for the support block. Balls (116) can be injected through the ball injection hole (153) and received in the ball seating groove (152) for the support block and the ball seating groove (117) for the shaft. When all balls (116) are received in the ball seating groove (152) for the support block and the ball seating groove (117) for the shaft, the ball injection hole (153) can be covered by a cover.

[0047] The support block (150) may include a block body (151), a plug (156), and a sealing member (158). The block body (151) has a hollow formed therein for inserting an upper portion of the shaft (115) through a lower opening. The block body (151) has an expansion groove formed in the lower portion that extends radially from the hollow.

[0048] The plug (156) has a hollow formed therein for inserting the lower portion of the shaft (115). The upper portion of the plug (156) is inserted into an expansion groove, and the lower portion extends to surround the lower portion of the block body (151). The plug (156) has a spring mounting groove (157) formed on its upper inner surface.

[0049] A sealing member (158) is installed between the lower portion of the block body (151) and the lower portion of the plug (156). The sealing member (158) may be made of an O-ring or the like to seal the gap between the lower portion of the block body (151) and the lower portion of the plug (156). The sealing member (158) can block foreign substances or moisture from entering through the gap between the block body (151) and the plug (156).

[0050] An elastic member (160) for the support block is mounted between the support block (150) and the shaft (115) to apply an elastic force downward to the support block (150). The elastic member (160) for the support block maintains the position of the locking lever (120) by keeping it in a linearly outwardly moved state and rotating it to reach an open position, thereby pressing the lever connecting parts (126) against the bottom of the support block (150).

[0051] The elastic member (160) for the support block is deformed to generate a restoring force when the support block (150) rises relative to the shaft (115) by receiving a lifting force from the chain of the hoist block. When the lifting force applied to the support block (150) is removed, the elastic member (160) returns the support block (150) by the restoring force.

[0052] The elastic member (160) for the support block may be composed of a plurality of compression springs. The compression springs may be received in a spring mounting groove (157) formed on the inner circumference of the support block (150), and their lower ends may be supported at the bottom of the spring mounting groove (157).

[0053] The support ring (166) can support the upper ends of the compression springs while encircling the shaft (115). The support ring (166) can be received in the spring mounting groove (157). The snap ring (167) can be fitted into a ring mounting groove formed along the outer surface of the shaft (115) and positioned above the support ring (166) to restrict the upward movement of the support ring (166). The snap ring (167) is fitted into the ring mounting groove with one end open and fixed to the shaft (115). The snap ring (167) can be received in the spring mounting groove (157).

[0054] In this way, the lower ends of the compression springs are supported at the bottom of the spring mounting groove (157) of the support block (150), and the upper ends are supported on the shaft (115) by the support ring (166) and the snap ring (167). Thus, when the support block (150) rises relative to the shaft (115), the springs can be compressed to generate a restoring force.

[0055] In addition, the automatic locking crane hook (100) may include a latch groove (118), a lever hinge shaft (124), a latch (170), and an elastic member (180) for the latch.

[0056] A latch groove (118) is formed on the inner side of the hook end (112). The latch groove (118) is formed to allow the tip portion of the latch (170) to be inserted through the upper opening. A lever hinge shaft (124) is installed on the lever body (121) across the lever hole (122) in the left-right direction.

[0057] The latch (170) is fitted onto the lever hinge shaft (124) and rotates within the lever hole (122), thereby being fitted into or removed from the latch groove (118). With the locking rod (123) of the locking lever (120) fitted into the locking hole (113) of the hook body (110), the latch (170) mounted on the locking lever (120) is fitted into the latch groove (118) of the hook body (110), so that the locking lever (120) can be double-securely locked against the hook body (110).

[0058] The latch (170) is formed so that its tip portion is fitted into the latch groove (118). Protrusions (125) that align and support the latch (170) are formed on the left and right inner walls of the lever hole (122), thereby allowing the latch (170) to be stably fitted into or removed from the latch groove (118).

[0059] A pressing projection (171) may be formed on the rear upper side of the latch (170). When the user rotates the pressing projection (171) backward, the tip portion of the latch (170) that was fitted into the latch groove (118) may be separated from the latch groove (118).

[0060] The elastic member (180) for the latch is mounted between the latch (170) and the lever body (121) and deforms to generate a restoring force when the latch (170) is separated from the latch groove (118). The elastic member (180) for the latch allows the latch (170) to return to its original position by the restoring force when an external force applied to the latch (170) in a rotational direction is removed.

[0061] For example, the elastic member (180) for the latch may consist of a pair of torsion springs with one end connected to the other. The torsion springs insert the lever hinge shaft (124) into the central spaces to surround both sides of the lever hinge shaft (124). The torsion springs may have one end connected to the other supported by the latch (170) and the other end supported by the lever body (121).

[0062] An example of the operation of an automatic locking crane hook (100) having the above-described configuration is described as follows with reference to FIGS. 1 to 7.

[0063] First, as shown in FIGS. 1 to 3, when the locking lever (120) is positioned to close the entrance of the hook body (110), the locking rod (123) of the locking lever (120) is fitted into the locking groove (113) of the hook body (110), and the latch (170) mounted on the locking lever (120) is fitted into the latch groove (118) of the hook body (110).

[0064] In this state, the user rotates the latch (170) backward to separate it from the latch groove (118) and pulls the locking lever (120) outward to separate the locking rod (123) from the locking groove (113). At this time, the elastic member (180) for the latch is deformed. As the locking lever (120) moves outward under the guidance of the elongated holes (127) fitted into the hook hinge shafts (114) of the hook body (110), the linear movement elastic member (130) is deformed. The second end portions (140b) of the rotation elastic member (140) move under the guidance of the spring guide grooves (128) of the locking lever (120).

[0065] Continuing, as illustrated in FIGS. 4 and 5, the user rotates the locking lever (120) to a position where the locking lever (120) is pulled outward and the opening of the hook body (110) is opened. At this time, the rotational elastic member (140) is deformed.

[0066] The support block (150) is slightly pushed upward from the shaft (115) of the hook body (110) by the lever connection portions (126) of the locking lever (120), and accordingly, the elastic member (160) for the support block is deformed.

[0067] Then, since the lever connecting parts (126) are pressed against the bottom of the support block (150) by the restoring force of the elastic member (160) for the support block, the locking lever (120) can be fixed in a rotated state in an open position by being pulled outward. At this time, the pressing projection (171) of the latch (170) can be pressed against the bottom of the support block (150) while rotated backward.

[0068] In this state, the chain of the hoist block connected to the support block (150) is lowered by the operation of the crane so that the open hook body (110) allows the wire rope or towing hook of a heavy object to be inserted, and then rises again.

[0069] Then, the hook body (110) rises with a wire rope or towing hook inserted to lift a heavy object. Then, the support block (150) rises from the shaft (115) of the hook body (110) on which the load of the heavy object is attached. At this time, the elastic member (160) for the support block is deformed.

[0070] When the support block (150) rises from the shaft (115), the locking lever (120) is released from being fixed to the support block (150). Then, as shown in FIG. 6, the locking lever (120) rotates in a direction that closes the opening of the hook body (110) by the restoring force of the rotational elastic member (140), and accordingly, the locking rod (123) of the locking lever (120) is positioned at the entrance of the locking groove (113) of the hook body (110).

[0071] Continuing, as illustrated in FIG. 7, the locking lever (120) moves linearly inward, guided by the elongated holes (127) by the restoring force of the linear movement elastic member (130). Accordingly, the locking rod (123) of the locking lever (120) is fitted into the locking groove (113) of the hook body (110).

[0072] The latch (170) is moved inward together with the locking lever (120) and then inserted into the latch groove (118) of the hook body (110) by the restoring force of the elastic member (180) for the latch. As a result, the locking lever (120) can be locked to the hook body (110) in the closed position.

[0073] In this way, according to the automatic locking crane hook of the present embodiment, after a user operates the locking lever to open the entrance of the hook body, the locking lever can be automatically locked by closing the entrance of the hook body during the process of lifting a heavy object according to the operation of the crane.

[0074] Accordingly, the automatic locking crane hook of the present embodiment can be conveniently used even when the wire rope or towing hook on the upper side of the heavy object is located out of reach of the user's hand or inaccessible, depending on the volume and height of the heavy object or the working environment.

[0075] FIG. 8 is a perspective view showing an elastic member for a support block of another example mounted within the support block.

[0076] Referring to FIG. 8, the elastic member (260) for the support block may be made of a disc spring. The disc spring may include a spring base (261) and an elastic deformation part (262). The spring base (261) has a shaft (115) inserted into its hollow. The spring base (261) may be formed in the shape of a circular ring.

[0077] The elastic deformation portion (262) is formed in a shape that extends downwardly in a radial direction from the outer surface of the spring base (261). The elastic deformation portion (262) is received in a spring mounting groove (257) formed on the inner surface of the support block (150), and its lower end is supported at the bottom of the spring mounting groove (257).

[0078] The elastic deformation portion (262) may be formed in a divided shape along the outer circumference of the spring base (251) or in a continuous shape along the outer circumference of the spring base (251).

[0079] The snap ring (267) is fitted into a ring mounting groove formed along the outer surface of the shaft (115) and positioned on the upper side of the spring base (261) to restrict the upward movement of the spring base (261). The snap ring (267) can be received in the spring mounting groove (257).

[0080] In this way, the lower end of the disc spring is supported at the bottom of the spring mounting groove (257) of the support block (150) and the upper end is supported on the shaft (115) by the snap ring (267), so when the support block (150) rises relative to the shaft (115), the elastic deformation part (262) can be bent to generate a restoring force.

[0081] The present invention has been described with reference to an embodiment illustrated in the accompanying drawings, but this is merely illustrative, and those skilled in the art will understand that various modifications and equivalent alternative embodiments are possible therefrom. Accordingly, the true scope of protection of the present invention should be determined only by the appended claims.

Claims

1. A hook body extending downward in a bent shape from the upper end of the hook to form a fitting space, having an entrance formed between the extended hook end and the upper end of the hook, having a locking groove formed on the outer side of the hook end, having hook hinge shafts formed protruding horizontally from the left and right sides of the upper end of the hook, and having a shaft extending upward from the upper end of the hook; A locking lever comprising: a lever body having a lever hole formed to pass through the hook end and a locking rod formed around the outer periphery of the lever hole that is fitted into or separated from the locking groove; and a pair of lever connecting parts extending from the lever body spaced apart from each other and fitted into the hook hinge axes through elongated holes to be supported so as to be rotatable and linearly movable; A linear movement elastic member mounted on the above hook body and locking lever, which deforms to generate a restoring force when the locking lever moves linearly outward along the longitudinal direction of the above slots; A rotatable elastic member mounted on the above-mentioned hook body and locking lever, which deforms to generate a restoring force when the locking lever rotates to a position that opens the entrance of the above-mentioned hook body; A support block that inserts the shaft into a hollow through a lower opening and supports it so as to be rotatable and vertically movable relative to the shaft; and An elastic member for a support block, mounted between the support block and the shaft to apply a downward elastic force to the support block, and maintaining the position of the locking lever by pressing the lever connecting portions against the bottom of the support block when the locking lever is maintained in a state of linear outward movement and rotates to reach an open position; Automatic locking crane hook including 2. In Paragraph 1, A latch groove formed on the inner side of the above hook end, and A lever hinge shaft installed on the lever body across the lever hole in the left-right direction, and A latch that is fitted onto the lever hinge shaft and is fitted into or separated from the latch groove as it rotates within the lever hole, and An automatic locking crane hook characterized by including an elastic member for a latch mounted between the latch and the lever body, which deforms to generate a restoring force when the latch is separated from the latch groove.

3. In Paragraph 1, The above-mentioned rotational elastic member is composed of a pair of torsion springs whose first ends are connected to each other, and An automatic locking crane hook characterized in that the torsion springs surround the hook hinge shafts, the first ends connected to each other are supported at the upper end of the hook, the second ends are inserted and supported in spring guide grooves formed on the inner side of the lever connecting parts, and move under the guidance of the spring guide grooves according to the linear movement of the lever connecting parts.

4. In Paragraph 3, An automatic locking crane hook characterized in that the lever connecting parts are formed in a protruding shape having the spring guide grooves, and in the release position, the protruding parts are in contact with and restrained by the lower surface of the support block.

5. In Paragraph 1, Balls arranged along the outer surface of the shaft, and A ball seating groove for a support block formed along the hollow inner surface of the support block to partially seat the balls, and It includes a ball seating groove for the shaft formed along the outer surface of the shaft to partially seat the balls, and An automatic locking crane hook characterized in that either the ball seating groove for the support block or the ball seating groove for the shaft has a width that is vertically longer than the diameter of the ball, thereby guiding the lifting of the balls by the lifting of the hook body.

6. In Paragraph 1, The elastic member for the support block above is composed of a plurality of compression springs, and The above compression springs are received in spring mounting grooves formed on the inner circumference of the support block, and their lower ends are supported on the bottom of the spring mounting grooves; A support ring that supports the upper ends of the compression springs while wrapping around the shaft, and An automatic locking crane hook characterized by including a snap ring that is fitted into a ring mounting groove formed along the outer surface of the shaft and positioned on the upper side of the support ring to restrict the upward movement of the support ring.

7. In Paragraph 6, The above support block is, A block body having a hollow formed to insert the upper portion of the shaft through a lower opening, and an expansion groove formed in the lower portion extending radially from the hollow, and A plug having a hollow formed for inserting the lower portion of the shaft, an upper portion inserted into the expansion groove, a lower portion extended to surround the lower portion of the block body, and a spring mounting groove formed on the upper inner surface, and An automatic locking crane hook characterized by including a sealing member mounted between the lower portion of the block body and the lower portion of the plug.

8. In Paragraph 1, The elastic member for the support block above is made of a disc spring, and The above-described disc spring comprises a spring base into which the shaft is inserted in a hollow, and an elastic deformation part that is formed in a shape extending downwardly in a radial direction from the outer surface of the spring base and is received in a spring mounting groove formed on the inner surface of the support block, with its lower end supported at the bottom of the spring mounting groove; An automatic locking crane hook characterized by including a snap ring that is fitted into a ring mounting groove formed along the outer surface of the shaft and positioned on the upper side of the spring base to restrict the upward movement of the spring base.

9. In Paragraph 8, The above support block is, A block body having a hollow formed to insert the upper portion of the shaft through a lower opening, and an expansion groove formed in the lower portion extending radially from the hollow, and A plug having a hollow formed for inserting the lower portion of the shaft, an upper portion inserted into the expansion groove, a lower portion extended to surround the lower portion of the block body, and a spring mounting groove formed on the upper inner surface, and An automatic locking crane hook characterized by including a sealing member mounted between the lower portion of the block body and the lower portion of the plug.

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