JP2010064872A - Device for preventing fall of coil from c-shaped hook - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the fall of a coil locked with a C-shaped hook. <P>SOLUTION: A plate-like stopper 21 provided at a tip of a lower end 13 of the C-shaped hook 10 can be moved by the operation of a handle 25 between a locking position, in which the stopper is projected upward from the tip of the lower end of the hook so as to lock a side surface of the coil W to prevent a fall thereof, and a waiting position, in which the stopper is not projected. With this structure, even in when the loading condition of the coil on the C-shaped hook is unstable or the coil collides with an obstacle such as an adjacent structure in transportation with a crane, a serious accident with a fall of the coil can be prevented. The stopper 21 is fitted to the tip of the lower end of the hook with a fixing bolt slidably inserted into a long hole, and can be held in both of the locking position and the waiting position. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a coil fall prevention device for a C-shaped hook.

  The tip of the C-shaped hook formed in a substantially C-shape is inserted and locked into the inner diameter space of a coil made of a thin metal sheet such as a rolled steel sheet and a wire rod bundled with a coil, and the coil is lifted Has been done.

  The C-shaped hooks known so far are not equipped with means for preventing the workpiece (coil) from dropping. If the loading state of the coil on the C-shaped hook is unstable, or if the coil collides with an obstacle such as an adjacent structure during transportation by a crane, there is a risk that the workpiece may fall and lead to a serious accident.

  Accordingly, an object of the present invention is to prevent a coil from dropping in a C-shaped hook.

  In order to solve this problem, the present invention according to claim 1 is a C-shaped hook in which a lower end portion is inserted and locked into the inner diameter space of the coil to lift the coil, and the coil side is locked to drop the coil. A stopper that is movably provided so as to be able to take a locking position that prevents interference and a retracting position that does not interfere with the side surface of the coil, and a moving means that moves the stopper between the locking position and the retracting position by a user operation And a coil fall prevention device for a C-shaped hook.

  According to a second aspect of the present invention, in the coil drop prevention device for the C-shaped hook according to the first aspect, the stopper is provided at the tip of the lower end portion of the C-shaped hook, and a locking position and a retracted position are provided on a substantially vertical surface. It is a plate-shaped stopper which can be rotated between.

  According to a third aspect of the present invention, in the coil drop prevention device for the C-shaped hook according to the second aspect, an elongated hole is formed in the plate-shaped stopper, and the lower end of the C-shaped hook is fixed by a fixing bolt inserted through the elongated hole. The plate-like stopper is slidably and pivotably connected to the tip. The plate-like stopper takes a locking position with a fixing bolt inserted into one end of the elongated hole, and is lifted upward from this locking position. The retracting position is taken in a state where a fixing bolt is inserted into the other end of the hole and rotated in a predetermined direction.

  According to a fourth aspect of the present invention, in the coil drop prevention device for the C-shaped hook according to the third aspect, the plate-shaped stopper is in contact with the side surface of the plate-like stopper at both the locking position and the retracted position. The abutment plate for regulating is fixed to the lower end portion of the C-shaped hook.

  According to a fifth aspect of the present invention, in the coil drop prevention device for the C-shaped hook according to the second aspect, the plate-shaped stopper is integrally rotated at the tip of the shaft that extends the lower end of the C-shaped hook in a substantially horizontal direction. It is connected, The lever for rotating this shaft is provided in the main body back surface side of a C-shaped hook, It is characterized by the above-mentioned.

  According to a sixth aspect of the present invention, in the coil drop prevention device for the C-shaped hook according to the fifth aspect, the abutment plate for restricting the position of the plate-shaped stopper to the locking position or the retracted position is provided at the lower end of the C-shaped hook. It is provided at the tip and can contact the plate-like stopper, or is provided on the back side of the C-shaped hook main body and can contact the lever.

  According to a seventh aspect of the present invention, in the coil drop prevention device for the C-shaped hook according to the first aspect, the stopper is locked so as to cover the side surface from the upper side of the coil locked to the lower end portion of the C-shaped hook. It is characterized in that it is connected to the main body of the C-shaped hook so as to be rotatable between a locking position and a retracting position where it is retracted upward from the locking position.

  The present invention according to claim 8 is the coil drop prevention device for the C-shaped hook according to claim 1, wherein the stopper is locked so as to cover the side surface from above the coil locked to the lower end of the C-shaped hook. It is connected to the main body of the C-shaped hook so as to be able to move up and down between a locking position and a retracted position where it is retracted upward from the locking position.

  The coil dropping device for the C-shaped hook according to the present invention is provided with a stopper that is movably provided so as to be able to take a locking position that locks the side of the coil to prevent the coil from falling and a retracted position that does not interfere with the side of the coil. And a moving means for moving the stopper between the locking position and the retracted position by a user operation. Therefore, the coil can be prevented from dropping by moving the stopper to the locking position with the lower end of the C-shaped hook inserted and locked in the inner diameter space of the coil. As a result, even if the loading state of the coil on the C-shaped hook is unstable or the coil collides with an obstacle such as an adjacent structure during transportation by a crane, the workpiece is held without falling. Therefore, it is possible to prevent a serious accident due to the workpiece falling.

  Embodiments of the present invention will be described below in detail with reference to the drawings. The present invention is not limited to these examples. For example, in the illustrated embodiment, the coil drop prevention device of the present invention is incorporated in a C-shaped coil designed to lift a relatively narrow coil, but the present invention is also applied to a C-shaped hook having a large coil width. Applicable.

  1 and 2, the C-shaped hook 10 has an upper end 12 and a lower end 13 extending substantially horizontally at the upper end and the lower end of the main body 11, respectively, and is formed in a substantially C shape. The upper end portion 12 is rotatably connected to the lower end of the arm 14, and a suspension pin 15 is connected to the upper end of the arm 14 to enable lifting by the crane hook 1 or the like. A counterweight 16 is attached to the tip of the upper end portion 12. The counterweight 16 is selected and attached according to the weight of the coil W to be lifted by the C-shaped hook 10. The lower end portion 13 is formed to have a laterally extending length corresponding to the width dimension of the coil W to be lifted by the C-shaped hook 10. Protection pads 17 and 18 for preventing the coil W from being damaged are attached to the inner surface of the main body 11 and the upper surface of the lower end portion 13. Further, handles 19, 19 for carrying the C-shaped hook 10 are attached to both side surfaces of the main body 11.

  The coil W is formed by bundling metal thin plates such as rolled steel sheets in a coil shape, and the lower end portion 13 is inserted into the inner diameter space S and is locked on the lower end portion 13 (on the protective pad 18). This state is shown in FIG.

  Further, referring to FIG. 3, the coil drop prevention device 20 attached to the C-shaped hook 10 includes a plate-like stopper 21 that is rotatably provided at the tip of the C-shaped hook lower end portion 13. The stopper 21 has an end portion 22 formed in a semicircular arc shape, and a long hole 23 extending toward the other end side is formed at a position close to the semicircular arc end portion 22. One end 23a of the long hole 23 is formed in a semicircular arc shape concentric with the semicircular arc center of the semicircular arc end portion 22, and the other end 23b is also formed in the same semicircular arc shape in this embodiment. The stopper 21 is slidable along the extending direction of the elongated hole 23 and is rotatable about a fixing bolt 24 that is inserted through the elongated hole 23. A handle 25 is attached near the end opposite to the semicircular arc end 22 of the stopper 21.

  3A and 3B show a state where the stopper 21 is in the locking position. At this time, the fixing bolt 24 is inserted through the other end 23 b of the elongated hole 23 of the stopper 21, and the end opposite to the semicircular arc-shaped end 22 exceeds the protective pad 18 on the surface of the C-shaped hook lower end 13. It protrudes upward and locks the side surface of the coil W (FIG. 1) to prevent the coil W suspended by the C-shaped hook 10 from dropping. Since the abutting plate 26 fixed to the tip surface of the C-shaped hook lower end portion 13 is in contact with the side surface 21a of the stopper 21, the stopper 21 cannot be rotated in any direction from this position and is held at the same position. Is done.

  By holding the handle 25 from this position and pulling up the stopper 21 upward, the fixing bolt 24 is slid toward the semicircular arc-shaped end portion 23a in the long hole 23 and is shown by a two-dot chain line in FIG. Move to position. When the fixing bolt 24 reaches the semicircular arc end 23a of the long hole 23, the stopper 21 can be rotated in the direction of the arrow about the fixing bolt 24 at the position. Thus, the stopper 21 can be reversed 180 degrees from the locking position shown in FIGS. 3 (a) and 3 (b) and moved to the retracted position shown in FIGS. 3 (c) and 3 (d). At this time, since the fixing bolt 24 is inserted through the one end 23a of the elongated hole 23 of the stopper 21, the semicircular arc-shaped end portion 22 does not protrude upward from the protective pad 18, and the coil W is smoothly loaded and unloaded. be able to. When the coil W is locked to the C-shaped hook lower end 13 at the retracted position shown in FIGS. 3C and 3D, the handle 21 is held and the stopper 21 is rotated 180 degrees counterclockwise. ), The stopper 21 falls by its own weight when the hand is released from the handle 25, and the fixing bolt 24 slides toward the end 23b in the long hole 23, It moves to the locking position shown in FIGS.

  Although the C-shaped hook 10 in this embodiment is shown in FIG. 4, since it has substantially the same configuration as that of the first embodiment, the corresponding members and elements are denoted by the same reference numerals and detailed description thereof is omitted.

  Referring to FIGS. 5 to 7 together with FIG. 4, the coil drop prevention device 30 of this embodiment attached to the C-shaped hook 10 is a plate that is rotatably provided at the tip of the C-shaped hook lower end portion 13. The stopper 31 is shaped. At the base end portion of the stopper 31, a square hole 33 (FIG. 7B) into which the angular axis (not indicated) of the fixing bolt 32 is inserted is provided, and the stopper 31 rotates together with the fixing bolt 32. It is configured as follows. The fixing bolt 32 is rotatably inserted through a through hole 13b formed in the tip plate 13a of the C-shaped hook lower end portion 13, and the tip round shaft portion 32a is inserted into the hole of the shaft 34 inside the tip plate 13a. The spring pins 35a and 35b are connected. The shaft 34 extends substantially horizontally to the back surface side of the main body 11 along the C-shaped hook lower end portion 13, and is connected so as to rotate integrally with the lever 37 with a bolt 36 on the back surface side of the main body 11.

  In the above configuration, when the stopper 31 is in the locking position (FIG. 5A), the tip of the stopper 31 protrudes upward beyond the protective pad 18 on the surface of the C-shaped hook lower end 13 so that the side surface of the coil W is The coil W is locked and the coil W suspended by the C-shaped hook 10 is prevented from dropping. At this time, the lever 37 is at the position indicated by the thick solid line in FIG. 6, and the stopper 31 is at the position indicated by the two-dot chain line in FIG.

  When the lever 37 is manually rotated in the direction of the arrow in FIG. 6A from this locking position, the shaft 34 and the fixing bolt 32 are also rotated in the same direction, and the stopper 31 is also rotated in the same direction. Move to the retracted position shown in. A contact plate 39 is fixed to the tip surface of the C-shaped hook lower end portion 13, and the stopper 31 stops at the retracted position when the side surface of the stopper 31 comes into contact with the contact plate 39. In FIG. 6, the stopper in the retracted position is indicated by a one-dot chain line, and the position of the lever 37 at this time is indicated by a thin solid line. Since the stopper 31 does not protrude upward from the protective pad 18 when in the retracted position, the coil W can be smoothly loaded and unloaded. After the coil W is locked to the lower end portion 13 of the C-shaped hook at the retracted position shown in FIG. 5B, when the lever 37 is rotated in the direction of FIG. 6B, the coil W moves to the locking position shown in FIG. Since the rotation of the lever 37 at this time is restricted by the contact plate 38, the stopper 31 is held in the locking position. In this embodiment, the shaft 34 is configured to rotate. However, the shaft is fixed, a long rod-shaped rotating member is passed through the shaft, and fixing bolts 32 and levers 37 are provided at both ends of the rotating member. You may connect so that each may rotate integrally.

  According to the coil fall prevention device 30 of this embodiment, even if the coil W is accidentally loaded when the stopper 31 is in the locking position, the stopper 31 moves in the direction of FIG. 6A because the inner diameter of the coil W hits the stopper 31. Since it rotates and automatically moves to the retracted position, there is an advantage that the stopper 31 is not damaged.

  Although the C-shaped hook 10 in this embodiment is shown in FIG. 8, since it has substantially the same configuration as in the first and second embodiments, the corresponding members and elements are denoted by the same reference numerals and detailed description thereof is omitted. To do. In the C-shaped hook 10 of this embodiment, the upper end portion 12 does not protrude laterally from the fulcrum of the arm 14, so that the counter balance 16 is not necessary.

  Referring to FIG. 9 together with FIG. 8, the coil drop prevention device 40 of this embodiment attached to the C-shaped hook 10 has a stopper 41. The stopper 41 is rotatably connected to the C-shaped hook body 11, and is locked at a position where the stopper 41 is locked so as to cover the side of the coil W locked at the lower end 13 of the C-shaped hook (FIG. 8). ) And a retracted position retracted upward from the locking position. More specifically, the stopper 41 is composed of a pair of substantially C-shaped members formed continuously and integrally from a base portion 41a, an intermediate portion 41b, and a tip portion 41c, and at both ends of the main body 11 at the end portion of the base portion 41a. The bolts 42 are rotatably connected. Since the square shaft of the bolt 42 is fitted in the square hole at the end of the stopper base 41a, the pair of stoppers 41 rotate integrally in synchronization.

  One end of the link 43 is rotatably connected to the side surface of the C-shaped hook body 11, and the other end is rotatably connected to one end of the link arm 44. The other end of the link arm 44 is rotatably connected to the stopper intermediate portion 41b. The end 45 of the link arm 44 on the connection side with the link 43 is bent so that when the link arm 44 is aligned with the link 43 in a straight line (indicated by a two-dot chain line in FIG. 9), It is prevented from rotating further in the counterclockwise direction in FIG. A handle 46 is provided so as to protrude outward from the stopper intermediate portion 41b.

  In the above configuration, when the stopper 41 is in the locking position (FIG. 8), the stopper tip 41c is in a state of covering the side surface of the coil W locked by the C-shaped hook lower end 13 from above. Prevents W from falling. At this time, the stopper 41, the link 43 and the link arm 44 are in the positions indicated by the solid lines in FIG.

  When the stopper 41 is rotated counterclockwise in FIG. 9 while holding the handle 46 by hand from this locking position, it moves to a retracted position indicated by a two-dot chain line in FIG. As described above, since the pair of stoppers 41 move together, even if only one of the handles 46 is operated, the pair of stoppers 41 are integrally rotated simultaneously in the same direction. As the stopper 41 rotates, the link arm 44 connected to the link 43 in a bent state at the locking position gradually goes straight, and the bent end 45 becomes a side surface of the link 43 when aligned completely in a straight line. Since the further movement is restricted at this time, the stopper 41 is held at the retracted position. Since the stopper 41 when in the retracted position does not interfere with the coil W locked to the C-shaped hook lower end portion 13, the coil W can be smoothly loaded and unloaded. After the coil W is locked to the lower end portion 13 of the C-shaped hook at the retracted position, the stopper 41 is rotated clockwise in FIG. 9 to move to the locking position of FIG.

  In this embodiment, no means for restricting the locking position of the stopper 41 is provided, and the position where the stopper 41 hits the coil W and cannot be further rotated clockwise is the locking position. 8 and 9, the stopper intermediate portion 41 b is substantially flush with the upper end of the coil W and is substantially horizontal, and the state where the tip portion 41 c covers the side surface of the coil W to prevent the coil from falling is the locked position. As shown in FIG. 10, for the coil W ′ having a small thickness, the stopper 41 further rotates clockwise from the position of FIG. Contact to prevent the coil from falling. That is, according to the coil drop prevention device 40 of this embodiment, there is an advantage that the coil thickness variation can be allowed within a certain range.

  Although the C-shaped hook 10 in this embodiment is shown in FIG. 11, it has substantially the same configuration as that of the third embodiment, and therefore, corresponding members and elements are denoted by the same reference numerals and detailed description thereof is omitted. As in the third embodiment, in the C-shaped hook 10 of this embodiment, the upper end portion 12 does not project laterally from the arm 14 fulcrum, so that the counter balance 16 is not required.

  Referring to FIG. 12 together with FIG. 11, the coil drop prevention device 50 of this embodiment attached to the C-shaped hook 10 has a stopper 51. The stopper 51 is connected to the C-shaped hook body 11 so as to be slidable in the length direction (vertical direction), and covers the side of the coil W locked to the lower end portion 13 of the C-shaped hook from the upper side. It can move between a locking position (FIG. 11 (a) solid line position) to be locked and a retracted position (FIG. 11 (a) two-dot chain line position) withdrawn upward from the locking position.

  More specifically, the stopper 51 is integrally formed of a base 51a, an intermediate part 51b, and a tip part 51c. The bases 51a are provided in parallel with an interval corresponding to the thickness of the main body 11, The part 51b is provided in parallel with a larger distance from the tip of the base part 51a in a pair so as to extend forward beyond the width of the coil W, and the tip part 51c connects the tips of the pair of intermediate parts 51b. It is formed to hang down. Then, the main body 11 is sandwiched between the pair of base portions 51 a and can be fixed and moved to an arbitrary height position along the main body 11 by the tightening knob 52. Since the screw holes 51d for threading the screw shafts of the tightening knob 52 are provided in the pair of base portions 51a, the tightening knob 52 can be set on either side of the main body 11. ing. Further, a pair of guide rails 53 are provided on the inner side of the main body 11 so as to extend in the vertical direction. The guide rails 53 are engaged with a step in the width direction between the base portion 51 a and the intermediate portion 51 b of the stopper 51 and the stopper 51. Guides up and down movement. A handle 54 is provided in the stopper intermediate portion 51b. Further, protective pads 55 and 56 for preventing the coil W from being damaged are provided on the lower surface of the stopper intermediate portion 51b and the back surface of the stopper tip portion 51c.

  In the above configuration, when the stopper 51 is fixed by the tightening knob 52 at the locking position (solid line position in FIG. 11A), the stopper tip 51c is locked to the C-shaped hook lower end 13. The coil W is covered from the upper side of the coil W to prevent the coil W from falling.

  The tightening knob 52 is loosened from this locking position, the stopper 51 is raised along the main body 11 by the handle 54, and moved to the retracted position indicated by a two-dot chain line in FIG. In this embodiment, since the stopper intermediate portion 51b can be moved up to a height position where it does not interfere with the C-shaped hook upper end portion 12, the stopper tip portion 51c is retracted to an arbitrary height position sufficiently away from the coil W. The fastening knob 52 may be used for fixing. The stopper 51 when in the retracted position does not interfere with the coil W locked to the C-shaped hook lower end 13, so that the coil W can be smoothly loaded and unloaded. After the coil W is locked to the C-shaped hook lower end portion 13 in the retracted position, the tightening knob 52 is loosened and lowered until the stopper 51 comes into contact with the upper end of the coil W, as shown by a solid line in FIG. The coil W is prevented from falling off by moving to the locking position.

  In this embodiment, a coil drop prevention device 70 is attached to a small C-shaped hook 60 having a round bar as a main body. Referring to FIG. 13, this C-shaped hook 60 is formed with a circular ring portion 62 for enabling lifting by a crane hook or the like by forming the upper end of a main body 61 made of a round bar in an annular shape, and the lower end of the main body 61 is The hook portion 63 is formed in a hook shape and can be inserted into the inner diameter space S of the coil W. The main body 61 is provided with a handle 64 for carrying the C-shaped hook 60.

  With reference to FIG. 13 and FIG. 14, the coil drop prevention device 70 of this embodiment attached to the C-shaped hook 60 is slidably connected in the length direction (vertical direction) along the main body 61. The stopper 71 is provided. The stopper 71 is a locking position (FIG. 13 (a) solid line position) that locks the coil W that is locked to the hook portion 63 so as to cover the side surface from above and a retracted position that is retracted upward from the locking position. (FIG. 13 (a) two-dot chain line position).

  More specifically, the stopper 71 includes a front side bracket 71a, a back side bracket 71b, an intermediate part 71c, and a tip part 71d. Each of the front side bracket 71 a and the back side bracket 71 b is formed in a substantially semi-cylindrical shape having a diameter slightly larger than the diameter of the C-shaped hook round bar main body 61, and is connected by a set bolt 72. The stopper 71 can be fixed at an arbitrary height position along the round bar body 61 by the tightening knob 73 so that the round bar body 61 of the C-shaped hook 60 is sandwiched between the front side bracket 71a and the back side bracket 71b. It can be moved. The back side bracket 71b is provided with a screw hole 71e for inserting the screw shaft of the tightening knob 73. When the tightening knob 73 is tightened, the tip of the screw shaft is pressed against the outer surface of the main body 11 to fix the stopper 71. can do.

  In the above configuration, when the stopper 71 is fixed by the tightening knob 73 at the locking position (the solid line position in FIG. 13A), the stopper tip 71d has the coil W locked by the hook 63. The coil W is prevented from falling by covering the side surface from above.

  From this locking position, the tightening knob 73 is loosened, the stopper 71 is raised along the main body 61, and moved to a retracted position indicated by a two-dot chain line in FIG. In this embodiment, since the connecting position of the brackets 71a and 71b to the main body 61 can be moved up to the bending point of the main body 61, the stopper tip 71d can be moved to an arbitrary height position sufficiently separated from the coil W. It may be retracted and fixed with the tightening knob 73. Since the stopper 71 when in the retracted position does not interfere with the coil W locked to the hook portion 63, the coil W can be smoothly loaded and unloaded. After the coil W is locked to the hook portion 63 in the retracted position, the locking knob 73 is loosened to lower the stopper 71 until it comes into contact with the upper end of the coil W, whereby the locking position shown by the solid line in FIG. To prevent the coil W from falling off.

It is the side view (a) and front view (b) of the C-shaped hook in which the coil fall prevention apparatus by one Example of this invention was integrated. It is a perspective view of this C-shaped hook. It is operation | movement explanatory drawing of this coil fall prevention apparatus, (a) And (b) is a principal part enlarged front view and principal part enlarged side view of a stopper latching position, (c) And (d) is the key of a stopper retracting position. It is a principal enlarged front view and a principal part enlarged side view. It is a side view (a) and a front view (b) of a C-shaped hook incorporating a coil drop prevention device according to another embodiment of the present invention. It is operation | movement explanatory drawing of this coil fall prevention apparatus, (a) is a principal part enlarged front view of a stopper latching position, (b) is a principal part enlarged front view of a stopper retracting position. It is a principal part expanded back view for demonstrating the lever operation in this coil fall prevention apparatus. It is the principal part expanded side view (a) of this coil fall prevention apparatus, and the figure (b) which expands and shows the front-end | tip part further. It is the side view (a) and front view (b) of the C-shaped hook in which the coil fall prevention apparatus by another Example of this invention was integrated. It is a principal part expanded side view of this coil fall prevention apparatus. It is a principal part enlarged side view when this coil fall prevention apparatus prevents the fall of a coil with small thickness. It is the side view (a) and front view (b) of the C-shaped hook in which the coil fall prevention apparatus by another Example of this invention was integrated. It is operation | movement explanatory drawing when this coil fall prevention apparatus exists in a stopper latching position, (a) is a principal part enlarged front view, (b) is a principal part enlarged side view. It is the side view (a) and front view (b) of the C-shaped hook in which the coil fall prevention apparatus by another Example of this invention was integrated. It is operation | movement explanatory drawing when this coil fall prevention apparatus exists in a stopper latching position, (a) is a principal part expanded side view, (b) is a principal part enlarged front view.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 C type hook 11 Main body 12 Upper end part 13 Lower end part 20 Coil fall prevention apparatus (Example 1)
21 Stopper 23 Long hole 24 Fixing bolt 25 Handle 26 Contact plate 30 Coil fall prevention device (Example 2)
31 Stopper 32 Fixing bolt 34 Shaft 37 Lever 38, 39 Contact plate 40 Coil fall prevention device (Example 3)
41 Stopper 43 Link 44 Link lever 45 Bending end 46 Handle 50 Coil fall prevention device (Example 4)
51 Stopper 52 Clamping Knob 53 Guide Rail 54 Handle 60 C-Shaped Hook 61 Round Bar Body 62 Round Ring 63 Hook 70 Coil Drop Prevention Device (Embodiment 5)
71 Stopper 73 Tightening knob

Claims (8)

In a C-shaped hook that inserts and locks the lower end portion into the inner diameter space of the coil and lifts the coil, a locking position that locks the side surface of the coil to prevent the coil from falling and a retracted position that does not interfere with the side surface of the coil A coil-falling prevention device for a C-shaped hook, characterized in that it has a stopper movably provided so as to be movable, and a moving means for moving the stopper between a locking position and a retracted position by a user operation . 2. The C-shaped stopper according to claim 1, wherein the stopper is a plate-shaped stopper which is provided at the tip of the lower end portion of the C-shaped hook and is rotatable between a locking position and a retracted position on a substantially vertical surface. Type hook coil fall prevention device. An elongated hole is formed in the plate-shaped stopper, and is slidably and rotatably connected to the tip of the lower end portion of the C-shaped hook by a fixing bolt inserted through the elongated hole. Take the locking position with the fixing bolt inserted into one end, lift it upward from this locking position, insert the fixing bolt into the other end of the elongated hole, and take the retracted position in the state rotated in a predetermined direction The coil fall prevention apparatus of the C-shaped hook of Claim 2 characterized by these. The contact plate for abutting the side surface of the plate-like stopper at both the latching position and the retracted position of the plate-like stopper to restrict the position is fixed to the lower end portion of the C-shaped hook. Item 4. The coil fall prevention device for the C-shaped hook according to Item 3. The plate-like stopper is connected to the tip of a shaft that extends the lower end portion of the C-shaped hook in a substantially horizontal direction so as to rotate integrally, and a lever for rotating the shaft is provided on the back side of the main body of the C-shaped hook. The coil drop prevention device for a C-shaped hook according to claim 2, wherein: A contact plate for restricting the position of the plate-like stopper to the locking position or the retracted position is provided at the tip of the lower end portion of the C-shaped hook and can contact the plate-shaped stopper, or on the back side of the C-shaped hook main body. The coil fall prevention device for a C-shaped hook according to claim 5, wherein the device is provided so as to be able to contact the lever. The stopper is rotatable between a locking position where the stopper is locked so as to cover the side of the coil locked to the lower end of the C-shaped hook and a retracted position where the stopper is retracted upward from the locking position. 2. The coil drop prevention device for a C-shaped hook according to claim 1, wherein the apparatus is connected to a main body of the shaped hook. C-shaped so that the stopper can be moved up and down between a locking position where the stopper is locked so as to cover the side of the coil locked to the lower end of the C-shaped hook and a retracted position where the stopper is retracted upward from the locking position. The coil fall prevention device for a C-shaped hook according to claim 1, wherein the device is connected to the main body of the hook.

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