Hook for Suspension and Inspection Jig

Abstract

Provided is a suspension hook capable of accurately measuring the opening degree of the hook. 【Solution means】 A base end portion 11 extending downward from a connecting portion 32 for suspension, a curved portion 13 formed to be curved in an arc shape from one end being the lower end of the base end portion 11 toward the other end, a tip portion 12 connected to the other end of the curved portion 13 and extending upward, and an inner portion 30 surrounded by the base end portion 11, the curved portion 13, and the tip portion 12. The base end portion 11, the curved portion 13, and the tip portion 12 have an inner peripheral portion 10a in contact with the inner portion 30 and an outer peripheral portion 10c on the side opposite to the inner peripheral portion 10a. The outer peripheral portion 10c of the base end portion 11 linearly extends in the extending direction and has a first outer peripheral surface 11b located above the center of curvature of the curved portion 13. The outer peripheral portion 10c of the tip portion 12 linearly extends in the extending direction and has a second outer peripheral surface 12b located from below to above the center of curvature of the curved portion 13. The first outer peripheral surface 11b and the second outer peripheral surface 12b are in an outward and parallel positional relationship with each other.

Description

Technical Field

[0001] The present invention relates to a hanging hook and an inspection jig.

Background Art

[0002] An apparatus for lifting and lowering a suspended load such as a winch has a hook for connecting to the suspended load at the lower end of a wire rope, a chain, etc. that hangs down below the apparatus. When an excessive load acts, the tip side of the hook gradually plastically deforms so as to open, and the dimension of the opening of the hook increases. Since the dimension of the opening has increased, it is presumed that an excessive load has acted on the hook and the winch etc. equipped with the hook, and dimension management of the opening is recommended for safety.

[0003] Patent Document 1 discloses a hook as a fixture used for a lifting chain sling. The hook is provided with a mark for notifying an operator that the hook should be deformed and replaced so that the tip side opens. The marks are provided by embossing on the respective side surfaces of the base portion and the tip portion of the hook, and the operator can know the degree of opening of the hook by measuring the distance between these two marks with a caliper or the like.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, the hook disclosed in Patent Document 1 may have torsional variations due to heat treatment or forging during manufacturing, resulting in variations in the initial dimensions between the markings. Also, since the tip portion of the hook is thinner than the root portion, when aligning the height of the markings protruding in the side direction of the hook for the purpose of facilitating measurement of the markings, it is required to increase the height of the markings at the tip portion. However, since the hook is formed by forging, it is difficult to increase the height of the markings, and furthermore, due to forging sag, rounding is formed on the side surface of the markings, making it difficult for calipers or the like to catch. Therefore, it may be difficult to quickly measure the dimensions between the markings using calipers or the like.

[0006] The present invention has been made in view of the above circumstances, and an object thereof is to provide a hanging hook and an inspection jig capable of quickly and accurately measuring the opening degree of the hook.

Means for Solving the Problems

[0007] The hanging hook according to one aspect of the present invention includes a base end portion extending downward from a hanging connection portion in a hanging state, a curved portion extending from the lower end of the base end portion and curved in an arc shape from one end toward the other end, a tip portion connected to the other end of the curved portion and extending upward, and an inner portion surrounded by the base end portion, the curved portion, and the tip portion. The base end portion, the curved portion, and the tip portion have an inner peripheral portion in contact with the inner portion and an outer peripheral portion opposite to the inner peripheral portion. The outer peripheral portion of the base end portion linearly extends in the extending direction and has a first outer peripheral surface located above the center of curvature of the curved portion in a hanging state. The outer peripheral portion of the tip portion linearly extends in the extending direction and has a second outer peripheral surface located from below to above the center of curvature of the curved portion in a hanging state. The first outer peripheral surface and the second outer peripheral surface are in an outward and parallel positional relationship with each other.

[0008] Further, the hanging hook according to one aspect of the present invention includes a base end portion extending downward from a hanging connection portion in a hanging state, a curved portion extending from the lower end of the base end portion and curved in an arc shape from one end toward the other end, a tip portion connected to the other end of the curved portion and extending upward, and an inner portion surrounded by the base end portion, the curved portion, and the tip portion. The base end portion, the curved portion, and the tip portion have an inner peripheral portion in contact with the inner portion and an outer peripheral portion on the side opposite to the inner peripheral portion. The outer peripheral portions of the base end portion and the tip portion have outer peripheral surfaces extending linearly. The first outer peripheral surface, which is the outer peripheral surface of the base end portion, and the second outer peripheral surface, which is the outer peripheral surface of the tip portion, are parallel to each other. In an inspection jig for inspecting the opening of the hanging hook, the opposing inner surfaces of the insertion portions inserted from the curved portion side are parallel, and the hanging hook can be inserted into the insertion portion only when the opening angle of the hanging hook is such that both the linearly extending outer peripheral surface of the base end portion and the linearly extending outer peripheral surface of the tip portion are in sliding contact with the inner surface in parallel.

[0009] Further, the hanging hook according to one aspect of the present invention is a hanging hook having a thick portion extending toward the inner diameter side and a thin portion extending thinner than the thick portion toward the outer diameter side from the thick portion, and includes a base end portion extending downward from a hanging connection portion and having a base end side recess on the outer peripheral surface, and a tip portion facing the base end portion and having a tip end side recess on the outer peripheral surface.

[0010] Further, an inspection jig for inspecting the opening of the hanging hook according to one aspect of the present invention is an inspection jig for inspecting the opening of the hanging hook, and includes a main body portion having a housing portion for inserting and housing the hanging hook therein, and groove portions provided on both end sides in the width direction of the housing portion, formed inside the main body portion, extending linearly in the insertion direction, and preventing movement of the hanging hook in a direction other than the insertion direction. When the hanging hook is housed in the housing portion, the inner surfaces of a pair of groove portions facing each other in the radial direction of the hanging hook are parallel to each other, and the distance between the inner surfaces is set such that the hanging hook can slide in contact.

Advantages of the Invention

[0011] According to the present invention, it is possible to provide a hanging hook and an inspection jig capable of quickly and accurately measuring the opening degree of the hook.

Brief Description of the Drawings

[0012]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Embodiments for Carrying Out the Invention

[0013] Hereinafter, the hanging hook according to the present embodiment will be described with reference to the drawings. In the following description, the "outer diameter side of the hanging hook" refers to the side that radially faces outward from the substantially U-shaped space defined by the base end portion, the curved portion, and the tip end portion, and the "inner diameter side of the hanging hook" refers to the side that radially faces inward toward the substantially U-shaped space.

[0014] [First Embodiment] (Chain Block) FIG. 1 is a side view showing a chain block 1 having a suspension hook 10 according to the present embodiment. In the present embodiment, the case where the suspension hook 10 is applied to a manual chain block 1 will be described, but it can also be applied to an electric chain block, other hoists, chain slings, etc.

[0015] The chain block 1 includes a chain block body 2, an upper hook 3, a load chain 4, a suspension hook 10, and a hand chain 5.

[0016] The chain block body 2 is mainly composed of a frame (not shown) and houses a load sheave with which the load chain 4 meshes, a hand wheel with which the hand chain 5 meshes, a speed reduction mechanism composed of gears, etc.

[0017] The upper hook 3 is connected to the uppermost part of the frame of the chain block body 2 and suspends the chain block 1 by suspending it from a beam of a structure or the like.

[0018] The load chain 4 is fed out from a load sheave provided in the chain block body 2 that supports the load chain 4, and supports the load of the suspended load through a hook, so that the suspended load moves up and down.

[0019] The suspension hook 10 is connected to the lower end of the load chain 4 on the suspended load side and is hooked on the suspended load or the eye part of the suspended load to support the suspended load.

[0020] The hand chain 5 is fed out from the hand wheel of the chain block body 2 and rotates in one direction or the other according to the pulling operation of the operator. When the hand wheel rotates in the rotation direction corresponding to the pulling operation of the hand chain 5, the rotation is transmitted to the load sheave through the speed reduction mechanism, and the suspension hook 10 moves up and down.

[0021] (Suspension hook) FIG. 2 is a side view showing the suspension hook 10 according to the present embodiment.

[0022] Taking the center of the virtual circle 31 shown in FIG. 2 as a reference, the direction along the load chain 4 shown in FIG. 1 is defined as the Z-axis. The X-axis is perpendicular to the Z-axis and is the left-right direction of FIG. 1 that crosses the proximal end side and the distal end side of the suspension hook 10. The Y-axis is perpendicular to the X-axis and the depth direction of FIG. 1 is defined as the Y-axis. The virtual circle 31 is a virtual circle that contacts the inner edge of the curved portion 13 to be described later, and its radius coincides with the minimum curvature radius of the inner edge of the curved portion 13.

[0023] The suspension hook 10 is connected to the lower end of the load chain 4 suspended from the load sheave of the chain block body 2 via a connecting fitting 6.

[0024] The suspension hook 10 has a proximal end portion 11 having a connecting portion 32 for connecting to the connecting fitting 6, a distal end portion 12, a curved portion 13, a proximal end side recess 14, and a distal end side recess 15. The proximal end portion 11, the distal end portion 12, and the curved portion 13 are partial regions of the suspension hook 10, and are integrally formed so as to extend downward from the connecting portion 32 in a state where the suspension hook 10 is suspended.

[0025] Specifically, the suspension hook 10 has a proximal end portion 11, a curved portion 13, and a distal end portion 12 in this order. A connecting portion 32 extends from one end of the proximal end portion 11, one end of the curved portion extends continuously from the other end in the extending direction of the proximal end portion 11, and one end of the distal end portion 12 extends continuously from the other end in the extending direction of the curved portion 13. An inner portion (pocket portion) 30 surrounded in a U-shape by the proximal end portion 11, the curved portion 13, and the distal end portion 12 is formed, and it has an inner edge portion 10b in contact with the inner portion 30 and an outer edge portion 10c as an outer peripheral portion on the side opposite to the inner edge portion 10b. The outer edge portion side of the suspension hook is the outer diameter side of the suspension hook.

[0026] The proximal end portion 11 includes the connecting portion 32 and serves as a joining portion that joins the connecting portion 32 and the curved portion 13.

[0027] The bent portion 13 is a hanging hook 10, which is a portion that supports a hanging portion such as a suspended load or a sling, and is bent toward the bag portion 30 side of the hanging hook 10. The inner edge surface 10a as the inner peripheral portion is the outer surface of the inner edge portion 10b of the thick portion 17 of the bent portion 13, is the surface on the bag portion side, and is in contact with the virtual circle 31. The inner edge surface 10a is connected to the flat surfaces (17a, 17b) of the thick portion 17. A thin portion 16 is formed on the outer edge side (outer edge portion 10c) opposite to the inner edge surface 10a of the thick portion 17. The thin portion 16 has flat surfaces (16a, 16b), and a boundary step portion 13a of the bent portion 13 is formed at the boundary between the flat surfaces (17a, 17b) of the thick portion 17 and the flat surfaces (16a, 16b) of the thin portion 16. An outer edge surface 13b is formed on the outer edge of the thin portion 16 of the bent portion 13. The thick portion 17 bulges from the boundary step portion 13a to both sides in the Y-axis direction to the flat surfaces (17a, 17b) with respect to the thin portion 16.

[0028] The tip portion 12 is a member that extends in a substantially straight line so as to gradually taper from the other end of the bent portion 13 toward the tip of the tip portion 12. The boundary between the thick portion 17 and the thin portion 16 of the tip portion 12 has a boundary step portion 12a that continues from the boundary step portion 13a of the bent portion 13 and extends toward the tip. The tip portion 12 and the base end portion 11 have a predetermined gap so that a hanging portion such as a suspended load can be inserted into the bag portion 30 of the hanging hook 10.

[0029] One end of the thick portion 17 of the base end portion 11 is connected to the connecting portion 32, and extends in a substantially straight line obliquely downward from the connected one end toward the other end. A boundary step portion 11a is formed at the boundary between the thin portion 16 formed on the outer edge side of the base end portion 11 and the thick portion 17 of the base end portion 11, and an outer edge portion 10c extending linearly and an outer edge surface 11b as the first outer peripheral surface are formed on the outer edge of the thin portion 16. The outer edge surface 11b extends linearly obliquely upward continuously from the outer edge surface 13b of the bent portion 13, and the outer edge surface 11c extends linearly from the outer edge surface 13b toward the lower end side (one end side of the base end portion 11) of the connecting portion 32.

[0030] As shown in FIG. 2, the angle θb formed between the X-axis, which is a horizontal plane, and the outer edge surface 11b is larger than the angle θa formed between the X-axis and the outer edge surface 11b in the state where the hanging hook 10 is hung. The angle θc formed between the X-axis and the boundary step portion 11a satisfies the relationship θa < θc < θb.

[0031] Therefore, the thin portion 16 of the base end portion 11 has a larger area than the other thin portions and has a shape that is easy for an operator to pinch and grip with fingertips.

[0032] The angle θb formed between the X-axis, which is a horizontal plane, and the linearly extending outer edge surface 11b in the state where the hanging hook 10 is hung is set to 75° ± 5°, and preferably, it is set in the range of 72° to 78°.

[0033] The thick portion 17 of the tip portion 12 is formed linearly obliquely upward substantially parallel to the thick portion of the curved portion 13 from the thick portion of the base end portion 11. The tip portion 12 is formed linearly obliquely upward from the outer edge surface 13b of the curved portion 13 and has an outer edge surface 12b as a second outer peripheral surface that extends linearly from below the center of the virtual circle 31 upward in the hanging state. The outer edge surface 12b of the tip portion 12 and the outer edge surface 11b of the base end portion 11 are formed parallel to each other.

[0034] The flat surfaces (17a, 17b) of the thick portion 17 are flat from the base end portion 11 to the curved portion 13 so that the bending in the Y-axis direction (twisting of the hook) can be confirmed.

[0035] When defining the relationship between the outer edge surface 11b of the base end portion and the outer edge surface 12b of the tip end portion, the linearly extending outer edge surface 11b of the base end portion 11 is located above the center of the virtual circle 31, and the linearly extending outer edge surface 12b of the tip end portion 12 is located from below to above the center of the virtual circle 31, and the linearly extending outer edge surface 11b of the base end portion 11 and the linearly extending outer edge surface 12b of the tip end portion 12 are parallel to each other. Therefore, the first outer edge surface (linearly extending outer edge surface 11b) linearly extending from the base end portion 11 as the first deformation detection portion and the second outer edge surface (linearly extending outer edge surface 12b) linearly extending from the tip end portion 12 are used to detect the change (deformation) of the opening angle of the hanging hook.

[0036] Since the base end portion 11 and the tip end portion 12 have linear portions provided in parallel to each other on the outer edge of the outer edge portion 10c, it is also possible to visually confirm the presence or absence of the opening of the hanging hook. By simply checking the distance difference between the base end portion 11 and the tip end portion 12 at two points on the straight line, it is possible to examine the degree of opening due to the deformation of the hanging hook 10 without using a dedicated jig or measuring instrument.

[0037] Also, when examining the degree of opening due to deformation using the inspection jig 90 described later, having this parallel portion allows the hanging hook 10 to be surely dropped into and inserted into the groove portion 92 of the inspection jig 90 in a certain posture. Therefore, it can be said that this shape is optimized for inspection by the inspection jig 90.

[0038] The hanging hook 10 has a thick portion 17 extending in the inner edge side (the side of the belly portion 30), which is the inner diameter side of the hanging hook 10, in the Y-axis (depth direction of the paper surface) direction from the base end portion 11 through one end to the other end of the curved portion 13 to the tip end portion 12, a thin portion 16 extending in the Y-axis (depth direction of the paper surface) direction on the outer edge side, which is the outer diameter side of the thick portion 17, and a boundary portion 18 connecting the thick portion 17 and the thin portion 16.

[0039] The boundary portion 18 further has a pair of linear boundary straight portions 18c that are provided at the base end portion 11 and the tip end portion 12 respectively and are part of the boundary portion 18 between the thick portion 17 and the thin portion 16. The pair of boundary straight portions 18c as the second deformation detection portion can detect the opening of the suspension hook 10 visually. The boundary straight portions 18c may be provided parallel to each other, or may be formed to be inclined so as to approach each other as they are separated from the curved portion 13, and may be provided so as to approach each other in parallel when an overload acts on the suspension hook 10.

[0040] The above-mentioned boundary step portion 11a formed linearly obliquely downward from the base end portion 11 and the boundary step portion 12a formed linearly obliquely upward from the tip end portion 12 indicate the inclined surface 18a of the boundary portion 18 that transitions from the thick portion 17 to the thin portion 16.

[0041] The thick portion 17 and the thin portion 16 have the surfaces 17a, 16a on the front side of the paper surface of FIG. 2 and the surfaces 17b, 16b on the back side of the paper surface corresponding to the surfaces 17a, 16a (FIG. 3). The surfaces 17a, 17b of the thick portion 17 and the surfaces 17b, 16b of the thin portion 16 are both parallel to the X-Z plane and the surfaces of each other are parallel. The tip end portion 12 of the thick portion 17 gradually tapers in the Y-axis direction from one end to the other end (the tip) of the tip end portion. Also, the thick portion 17 and the thin portion 16 are formed perpendicular to the bottom surfaces of the base end side recess 14 and the tip end side recess 15 described later.

[0042] Further, the suspension hook 10 is formed such that the width B in the radial direction of the base end portion 11 perpendicular to the extending direction of the base end portion 11 is smaller than the diameter C of a substantially circular virtual circle 31 defined by the inner edge surface 10a on the inner diameter side of the suspension hook 10.

[0043] In the thin-walled portion 16, a base-end side recess 14 that is formed in the base-end portion 11 and recessed toward the inner diameter side of the suspension hook 10, and a tip-end side recess 15 that is formed in the tip-end portion 12 and recessed toward the inner diameter side of the suspension hook 10 are formed. Further, the base-end side recess 14 and the tip-end side recess 15 are provided at positions where a straight line connecting the base-end side recess 14 and the tip-end side recess 15 does not interfere with the hook latch 21 when the hook latch 21 is positioned in the narrow portion 24 described later. Also, the straight line connecting the base-end side recess 14 and the tip-end side recess 15 is formed at a position orthogonal to the outer edge surfaces 11b and 12b that extend linearly.

[0044] The base-end side recess 14 is an outer edge surface 11b that is linearly formed obliquely upward from one-end side outer edge surface 13b of the curved portion 13 of the base-end portion 11, and is formed on the side opposite to the curved portion 13 on the connecting portion 32 side from a position 19 where the bending force acting on the suspension hook 10 becomes maximum when a load acts. The tip-end side recess 15 is formed on the outer edge surface 12b that is linearly formed obliquely upward from the other-end side outer edge surface 13b of the curved portion 13 of the tip-end portion 12. The position 19 where the bending force acting on the suspension hook 10 becomes maximum is arranged at a position where the X-axis crosses the base-end portion 11.

[0045] The bottom surface portions 14a and 15a of the base-end side recess 14 and the tip-end side recess 15 are formed substantially parallel to each other on the linearly formed outer edge surfaces 11b and 12b of the base-end portion 11 and the tip-end portion 12, respectively.

[0046] Here, with reference to FIG. 3, the base-end side recess 14 and the tip-end side recess 15 will be further described. FIG. 3 is a cross-sectional view showing a state in which the suspension hook of FIG. 2 is cut along line A-A and viewed from the arrow direction.

[0047] The base-end side recess 14 has a bottom surface portion 14a that is the bottom surface side of the depression of the base-end side recess 14, and the bottom surface portion 14a is formed in a planar shape. Similarly, the tip-end side recess 15 has a bottom surface portion 15a that is the bottom surface side of the depression of the base-end side recess 14, and the bottom surface portion 15a is formed in a planar shape.

[0048] The base - end - side recess 14 and the tip - end - side recess 15 are markings provided for checking whether the opening distance, which is the opening between the base - end portion 11 and the tip - end portion 12 of the hanging hook 10, is within a predetermined reference dimension value. The width of the base - end - side recess 14 and the tip - end - side recess 15 in the direction along which the outer edge surfaces 11b and 12b extend linearly is set to be slightly wider than the thickness of the outer blade of the caliper. Therefore, for example, with the caliper, when one blade is applied to the base - end - side recess 14 and the other blade is applied to the tip - end - side recess 15 so as to sandwich the base - end - side recess 14 and the tip - end - side recess 15, the opening distance can always be easily measured at the same position. Also, without using a measuring instrument such as a caliper, it is possible to check whether the opening distance is within a predetermined reference dimension value using a gauge for replacement reference.

[0049] Since the bottom surfaces 14a and 15a of both the base - end - side recess 14 and the tip - end - side recess 15 are formed in a planar shape, when applying the blade of the caliper, the orientation of the caliper can be adjusted immediately, and the opening distance can be measured more simply. In addition, when the distance between the base - end - side recess 14 and the tip - end - side recess 15 is greater than a predetermined value, it can be estimated that an overload has acted on the hanging hook 10, and the use of the hanging hook 10 is suspended.

[0050] Since the flat surfaces 17a and 17b of the thick - wall portion 17 are formed parallel to the X - Z plane and are orthogonal to the bottom surfaces 14a and 15a, for example, in dimension confirmation using a gauge or the like, when aligning the gauge or the like with the base - end - side recess 14 and the tip - end - side recess 15, by pressing the gauge or the like against the plane of the thick - wall portion 17, it is possible to prevent the gauge or the like from becoming oblique, and the alignment of the gauge or the like can be easily performed.

[0051] As described above, the thin-walled portion 16 is a thin-walled portion that is thin in the Y-axis (depth of the paper) direction. As shown in FIG. 3, the thin-walled portion 16 at the base end portion 11 is larger than the thin-walled portion 16 at the tip end portion 12 both in the radial direction and in the vertical direction of the paper surface. Thus, as shown in FIG. 2, the thin-walled portion 16 is continuously extended so as to become larger in the order of the tip end portion 12, the bent portion 13, and the base end portion 11, and the thin-walled portion 16 near the portion where the outer edge surface 11b and the outer edge surface 11c of the base end portion 11 intersect is the largest. That is, the thin-walled portion 16 of the base end portion 11 extends outward in the radial direction more than other portions in a flat plate shape that can be gripped by an operator. Thereby, the operator can easily grip the hanging hook 10 by a gripping operation of pinching the thin-walled portion 16, and the workability of the work performed by gripping the hanging hook 10 can be improved.

[0052] As described above, since the bending force acting on the hanging hook 10 is the largest near the position 19 where the bending force of the base end portion 11 is the largest, by increasing the radial dimension of the base end portion 11 in the cross section of the hanging hook 10, the strength of the hanging hook 10 can be improved.

[0053] Since the thin-walled portion 16 of the base end portion 11 has the largest area, numbers and characters as information regarding the hanging hook 10 such as load-bearing capacity are shown on the thin-walled portion 16 by embossing. In FIG. 2, as an example, “MAX95” indicating the MAX value of the opening distance is written. Note that the numbers and characters do not have to be printed by embossing, and may be three-dimensionally shown in a convex shape or a concave shape from the surroundings, or may be printed by a method such as engraving or painting.

[0054] As shown in FIG. 2, the hanging hook 10 further includes a hook latch 21 for preventing the hanging load suspended from the hanging hook 10 from coming off the hanging hook 10, a support shaft 22 that is a rotation shaft of the hook latch 21, and a torsion coil spring 23 that always biases the hook latch 21 toward the inner diameter side of the tip end portion 12.

[0055] The support shaft 22 is provided at a position facing the tip 12 of the base end portion 11. The torsion coil spring 23 is coaxially mounted on the support shaft 22 and always applies an urging force to the hook latch 21 so that the hook latch 21 rotates counterclockwise in FIG. 2. Thereby, the hook latch 21 is always urged toward the portion where it abuts at the tip 12, and the said portion as the third deformation detection part can detect the deformation of the hanging hook 10 visually. In particular, if there is a sharp part or the like on the tip side of the hook latch 21 and an arc-shaped scratch is formed in the narrow part 24 where the hook latch 21 abuts, by observing the change in the radius of the arc-shaped scratch, it becomes possible to detect the degree of deformation of the hanging hook 10 visually. On the inner diameter side of the hanging hook 10, a narrow part 24 with a small axial width of the thick part 17 is formed. The tip of the hook latch 21 is formed in a bifurcated shape, and when the tip of the hook latch 21 rotates and abuts against the tip 12, the bifurcated part fits into both sides of the narrow part 24. Thereby, even if a force in the support shaft direction acts on the hook latch 21, it is possible to prevent the hook latch 21 from shifting in the axial direction of the tip 12 and the suspended load from coming off the hanging hook 10.

[0056] When suspending the suspended load on the hanging hook 10, the hook latch 21 is rotated clockwise in FIG. 2 against the urging force of the torsion coil spring 23, and with the state where the tip of the hook latch 21 and the narrow part 24 of the tip 12 are separated, the sling or the like of the suspended load may be hooked into the hanging hook 10.

[0057] [Second Embodiment] In the first embodiment, the opening distance, which is the opening between the base end portion 11 and the tip portion 12 of the hanging hook 10, is measured using calipers, and it is checked whether the opening distance is within a predetermined reference dimension value. Instead of that, in this embodiment, it is checked using a dedicated inspection jig. In the first embodiment, the hanging hook 10 was described using the X-axis and Z-axis in FIGS. 1 and 2. However, in this embodiment, regarding the axes, independently of the first embodiment, a new X-axis, Y-axis, and Z-axis will be used for explanation from FIGS. 5 to 7. Also, the same components as those in the first embodiment are denoted by the same reference numerals and their description is omitted.

[0058] (Inspection jig 90: Structure) FIG. 5 is a perspective view showing an inspection jig 90 for inspecting the opening of the hanging hook 10 according to the present embodiment. The inspection jig 90 includes a main body portion 91 and a groove portion 92.

[0059] The main body portion 91 has an integrated structure in which four wall portions 91a are combined in a substantially rectangular shape. The four wall portions 91a form a housing portion 91b for housing the hanging hook 10 to be inserted therein. Further, one wall portion 91a of the main body portion 91 (the wall portion 91a on the front side in the direction of the arrow of the Y axis) has an opening 91c communicating with the housing portion 91b. For this reason, the wall portions 91a facing the opening 91c are respectively arranged at both ends in the X-axis direction. This opening 91c is used to detach the hanging hook 10 from the inspection jig 90 when the hanging hook 10 is inserted into the inspection jig 90.

[0060] Further, insertion portions 91f, which are openings for inserting the hanging hook 10, are formed in the upper surface 91d and the lower surface 91e of the main body portion 91 that are substantially perpendicular to the XY plane, and the insertion portions 91f communicate with the housing portion 91b. Note that the inspection jig 90 does not need to be used in the orientation shown in FIG. 5, and functions as the inspection jig 90 regardless of the orientation. Also, the inspection jig 90 can be inserted from either the upper surface 91d side or the lower surface 91e side.

[0061] The groove portion 92 is a part of the housing portion 91b and is provided on both end sides in the X-axis direction of the housing portion 91b. Since the groove portion 92 is surrounded by the four wall portions 91a, it prevents the hanging hook 10 from moving in a direction other than the Z-axis direction. The shape of the groove portion 92 is formed along the thin-walled portion of the hanging hook 10 (at A in FIG. 6). The interval in the X direction connecting the pair of groove portions 92 (that is, the width of the housing portion 91b) is provided slightly larger than the interval between the outer edge surfaces 11b and 12b of the hanging hook 10. Thereby, the hanging hook 10 moves linearly while sliding with respect to the groove portion 92.

[0062] The groove portion 92 is formed to have the same width from the upper surface 91d to the lower surface 91e along the Z-axis direction of the main body portion 91. Thereby, when the hanging hook 10 is inserted into the inspection jig 90, the hanging hook 10 can slide in the Z-axis direction from the upper surface 91d to the lower surface 91e or vice versa. In the groove portion 92, a part along the Z-axis direction, for example, only near the lower surface 91e, may extend inward so as to form the XY plane, and may have a shape that closes the vicinity of the lower surface 91e of the groove portion 92 (or the housing portion 91b). Thereby, the extended portion serves as a stopper, and the hanging hook 10 inserted into the inspection jig 90 from the upper surface 91d becomes non-slidable near the lower surface 91e, so that it is possible to prevent the hanging hook 10 from falling from the side opposite to the insertion side.

[0063] Of the pair of groove portions 92, inner surfaces 92a are respectively provided at the ends in the X-axis direction, and these inner surfaces 92a are formed to be parallel to each other. The distance between the inner surfaces 92a is set such that the linearly extending outer edge surfaces 11b, 12b (FIG. 2) of the hanging hook 10 are accommodated while sliding.

[0064] (Inspection jig 90: Inspection) A case of inspecting the opening of the hanging hook 10 using the inspection jig 90 will be described. FIG. 6 is an explanatory diagram for explaining a state in which the hanging hook 10 is inserted into the inspection jig 90 for inspecting the degree of opening of the hanging hook 10 according to the present embodiment. A shows a state in which the hanging hook 10 can be inserted into the inspection jig 90, and B shows a state in which the hanging hook 10 cannot be inserted into the inspection jig 90. Among A in FIG. 6, the upper figure is a partial cross-sectional view showing a state seen from the arrow direction after cutting the lower figure along the H-H line, and the lower figure is a partial cross-sectional view showing a state seen from the arrow direction after cutting the upper figure along the G-G line.

[0065] When an overload that causes plastic deformation acts on the hanging hook 10, the opening distance between the tip portion 12 and the base portion 11 opens. When this opening distance exceeds a predetermined limit opening distance, the use of the hook is stopped for safety reasons. In the hanging hook 10, since the above inspection as to whether the opening distance is at the limit opening distance is regularly performed, it is desirable that the inspection can be performed as quickly and simply as possible while maintaining accuracy.

[0066] The shortest distance Lmax between the inner surfaces 92a of the pair of groove portions 92 in the X-axis direction of the inspection jig 90 and the shortest distance L between the linear outer edge surfaces 11b and 12b of the hanging hook 10 in the X-axis direction, which is the size of the hanging hook 10, are set to be the same or substantially the same (B in FIG. 6).

[0067] Specifically, the shortest distance Lmax between the inner surfaces 92a of the grooves in the X-axis direction of the inspection jig 90 is set to a value such that when the linear outer edge surfaces 11b and 12b of the hanging hook 10 are inserted into the inspection jig 90, they are accommodated while sliding on the inner surface 92a of the inspection jig 90. For this reason, the hanging hook 10 can be inserted into the inspection jig 90 only when the opening distance is at or below the limit opening distance, and cannot be inserted into the inspection jig 90 when the opening distance exceeds the limit opening distance due to deformation of the hanging hook 10.

[0068] Further, since the linear outer edge surfaces 11b and 12b extending in the hanging hook 10 are parallel to each other, and the inner surfaces 92a at both ends in the X-axis direction of the pair of groove portions 92 of the inspection jig 90 are parallel to each other, even when the opening distance is at or below the limit opening distance, if the relative inclination between the outer edge surfaces 11b and 12b of the hanging hook 10 centered on the Y-axis and the inner surface 92a of the inspection jig 90 does not match, the hanging hook 10 cannot be inserted into the inspection jig 90.

[0069] For example, in Figure 6B, the suspension hook 10 is slightly displaced counterclockwise about the Y-axis direction compared to Figure 6A. In this state, even if the opening distance is within the limit opening distance and the shortest distance Lmax between the inner surfaces 92a of the grooves in the X-axis direction of the inspection jig 90 is substantially the same as the shortest distance L between the linear outer edge surfaces 11b and 12b of the suspension hook 10, the suspension hook 10 cannot be inserted into the inspection jig 90 because the parallel portions do not align linearly at the insertion portion 91f of the inspection jig 90.

[0070] In this case, when the suspension hook 10 is tilted clockwise about the Y-axis direction and the inner surface 92a of the groove of the inspection jig 90 and the linear outer edge surfaces 11b and 12b of the suspension hook 10 are linearly aligned and parallel, the suspension hook 10 can be inserted into the inspection jig 90 (Figure 6A).

[0071] On the other hand, when the opening distance exceeds the limit opening distance due to deformation of the suspension hook 10, even if the suspension hook 10 is tilted clockwise about the Y-axis direction, the shortest distance L between the outer edge surfaces 11b and 12b of the suspension hook 10 is longer than the shortest distance Lmax of the inner surface 92a of the groove of the inspection jig 90. Therefore, no matter how much the suspension hook 10 is tilted at any angle about the Y-axis direction, the suspension hook 10 cannot be inserted into the inspection jig 90.

[0072] In this way, the outer edge surfaces 11b and 12b of the suspension hook 10 and the inner surfaces 92a of the pair of groove portions 92 of the inspection jig 90 are linearly aligned and parallel, and the suspension hook 10 can be inserted into the inspection jig 90 only when the shortest distance L between the linear outer edge surfaces 11b and 12b of the suspension hook 10 is less than or equal to the shortest distance Lmax between the inner surfaces 92a of the pair of groove portions 92 of the inspection jig 90.

[0073] In this state, the angle of the suspension hook 10 is such that both the linearly extending outer edge surface 11b of the base end portion 11 and the linearly extending outer edge surface 12b of the tip end portion 12 are in sliding contact parallel to the inner surface 92a of the inspection jig 90.

[0074] The two inner surfaces 93b and 93c facing each other across the space between the inner surface 93a of the internal plane 93 in the Y-axis direction of the inspection jig 90 and the space into which the suspension hook 10 is inserted are parallel to each other, and are formed so as to be substantially parallel to the surfaces of the flat surfaces (17a, 17b) of the thick portion 17 of the suspension hook 10.

[0075] The shortest distance L2 between the inner surfaces 93b and 93c facing the inner surface 93a of the internal plane 93 in the Y-axis direction of the inspection jig 90 is set such that the dimension of the inspection jig 90 is the same as or substantially the same as the thickness of the thick portion 17 of the suspension hook 10.

[0076] Also, the surface of the surface 94b facing each other across the space between the inner surface 94a of the internal plane 94 in the Y-axis direction of the inner surface 92a of the inspection jig 90 and the space into which the suspension hook 10 is inserted is formed in parallel. Also, the shortest distance L3 is set smaller than the shortest distance L2 of the internal plane 93 of the inspection jig 90, and the dimension is set to be substantially the same as the thickness of the thin portion 16 corresponding to the fin portion of the suspension hook 10.

[0077] Thus, when inserting the non-deformed suspension hook 10 into the inspection jig 90, the surface of the thick portion 17 of the suspension hook 10 is inserted so as to be in sliding contact with any pair of surfaces, namely, the inner surface 93a of the internal plane 93 in the Y-axis direction of the inspection jig 90 and the surfaces 93b and 93c facing it, or the inner surface 94a of the inner surface 92 in the Y-axis direction of the groove portion 92 and the surface 94b facing it.

[0078] On the other hand, when the tip portion 12 of the suspension hook 10 is deformed in the Y-axis direction, the inner surfaces 93a, 93b, and 93c of the internal plane 93 in the Y-axis direction of the inspection jig 90 and the surface of the thick portion 17 of the suspension hook 10 are not parallel, and the dimension of the suspension hook 10 in the Y-axis direction is longer than the thickness of the thick portion 17, so it becomes longer than the shortest distance L2 of the inner surface in the Y-axis direction of the inspection jig 90, and thus the suspension hook 10 cannot be inserted into the inspection jig 90.

[0079] As a result, even though the shortest distance L between the outer edge surfaces 11b and 12b of the hanging hook 10 is deformed to open beyond the reference value and reaches the usage limit of the hanging hook 10, it is possible to prevent the incorrect recognition that it is still a usable non-defective product. Therefore, it is possible to quickly and accurately inspect the opening of the opening with a simple operation.

[0080] Also, even when the hanging hook 10 is deformed so as to be twisted in the Y-axis direction, it is possible to prevent the incorrect recognition that it is still a usable non-defective product.

[0081] Next, a case where the hanging hook 80 is inserted into the inspection jig 100 in the comparative example will be described with reference to FIG. 7.

[0082] In the comparative example, the inspection jig 100 has a structure similar to that of the present embodiment. The difference lies in the shape of the groove portion 102, and even if the cross-sectional shapes of the base end portion 111 and the tip end portion 112 cut in the XY plane are significantly different, the dimensions are set with a margin such that the hanging hook 80 can be inserted. Therefore, as shown in the lower diagram of A in FIG. 7, rattling may occur depending on the cross-sectional shape of the hanging hook 80 that changes due to the inclination of the hanging hook 80.

[0083] In FIG. 7, A shows that the distance between the reference points 113 of the hanging hook 80 is P, and B shows that the distance between the reference points 113 of the hanging hook 80 is P + α. In FIG. 7A, the upper diagram is a partial cross-sectional view showing the state seen from the arrow direction after cutting the lower diagram along the F-F line, and the lower diagram is a partial cross-sectional view showing the state seen from the arrow direction after cutting the upper diagram along the E-E line.

[0084] In the comparative example, reference points 113 are respectively provided on the side surfaces of the base end portion 111 and the tip end portion 112 of the hanging hook 80 by embossing. In such a hanging hook 80, when the measured distance between the reference points 113 exceeds a predetermined range, it is determined that the opening is too wide. The distance between the reference points 113 is measured using a measuring instrument such as a caliper.

[0085] In the structure of the hanging hook 80 in the comparative example, as shown in A of FIG. 7, when the distance P between the punctuation marks 113 of the base end portion 111 and the tip end portion 112 is equal to or less than the reference dimension value, the hanging hook 80 can be inserted into the inspection jig 100.

[0086] On the other hand, when the distance P + α between the punctuation marks 113 of the base end portion 111 and the tip end portion 112 is longer than the reference dimension value, the inclination of the hanging hook 80 cannot be inserted into the inspection jig 100 in the state shown in A of FIG. 7. However, as shown in B of FIG. 7, if the hanging hook 80 is tilted counterclockwise about the Y axis, it can be inserted into the inspection jig 100.

[0087] Thus, when inspecting the opening distance between the base end portion 111 and the tip end portion 112 of the hanging hook 80, depending on the inclination of the hanging hook 80 in the direction around the Y axis, there is a possibility that even if the distance P + α between the punctuation marks 113 exceeds the reference dimension value, it can be determined as a non-defective product.

[0088] On the other hand, in the present embodiment, since the hanging hook 10 has parallel linear outer edge surfaces 11b and 12b, and the groove of the inspection jig 90 has parallel inner surfaces 92a, if the opening distance between the base end portion 11 and the tip end portion 12 of the hanging hook 10 exceeds the limit opening distance even slightly, the hanging hook 10 cannot be inserted into the inspection jig 90. Therefore, the accuracy of non-defective product determination can be improved.

[0089] [Modification Example] In the above first embodiment, the base end side recess 14 and the tip end side recess 15 are formed substantially parallel to each other on the linear outer edge surfaces 11b and 12b of the base end portion 11 and the tip end portion 12, respectively. However, as long as the opening distance of the hanging hook 10 can be measured by sandwiching it from the outside with a caliper or the like, they do not necessarily have to be parallel.

[0090] Further, the shapes of the proximal end side recess 14 and the distal end side recess 15 may be a substantially U shape, a triangular shape, or the like. FIG. 4 is a diagram showing a modified example of the proximal end side recess 14 and the distal end side recess 15 in the hanging hook 10 according to the first embodiment. A and B in FIG. 4 are only different from the hanging hook 10 of the present embodiment in the shape of the recess, and the other shapes are the same. C in FIG. 4 is a shape example when a recess is provided in a hanging hook 60 having no linear portion in the outer shape of the proximal end portion and the distal end portion.

[0091] In such hanging hooks 40, 50, and 60, the proximal end side recesses 44, 54, and 64 may be disposed in a portion above the proximal end portions 41, 51, and 61 on the X-axis passing through the substantially circular center on the inner diameter side of the hanging hooks 40, 50, and 60, and the distal end side recesses 45, 55, and 65 may be disposed near the distal end portions 42, 52, and 62 on the X-axis.

[0092] Regarding the shapes of the respective proximal end side recesses 44, 54, and 64 and the distal end side recesses 45, 55, and 65, in FIG. 4A, the shapes of the proximal end side recess 44 and the distal end side recess 45 are notched in a substantially triangular shape when viewed in the illustrated direction. In FIG. 4B, the shapes of the proximal end side recess 54 and the distal end side recess 55 are notched in a substantially U shape with a curved bottom surface when viewed in the illustrated direction. In FIG. 4C, the shapes of the proximal end side recess 64 and the distal end side recess 65 are notched in a shape in which the radial depth of the hanging hook 60 becomes shallower toward the bending portion direction when viewed in the illustrated direction.

[0093] Further, in the above embodiment, a number is shown as information regarding the hanging hook 10 in the thin portion 16 of the proximal end portion 11, but it may be shown in the thin portion 16 of the bending portion 13 or the distal end portion 12.

[0094] Further, in the above embodiment, the hanging hook 10 for hanging a load has been described as an example, but the hanging hook 10 of the present embodiment may be used for the upper hook 3, the hook for a chain sling, or the like.

[0095] [Supplementary Explanation of the Embodiment] The above-described embodiments all show preferred specific examples of the present invention. The numerical values, arrangement positions of components, order of connection forms, etc. shown in the above embodiments are merely examples and are not intended to limit the present invention. Also, each figure is not necessarily drawn precisely.

[0096] As described above, embodiments of the present invention have been explained. However, the above embodiments merely show a part of the application examples of the present invention and are not intended to limit the technical scope of the present invention to the specific configurations of the above embodiments.

[0097] [Supplementary Note] The content described in some of the above embodiments can be understood as follows, for example.

[0098] (1) Parallel (without thickness limitation) A base end portion 11 extending downward from a suspension connection portion 32 in a suspended state, A curved portion 13 extending from the lower end of the base end portion 11 and curved in an arc shape toward the other end with one end being the lower end, A tip portion 12 connected to the other end of the curved portion 13 and extending upward, An inner portion 30 surrounded by the base end portion 11, the curved portion 13, and the tip portion 12, Comprising, The base end portion 11, the curved portion 13, and the tip portion 12 have an inner edge surface 10a in contact with the inner portion 30 and an outer edge portion 10c on the side opposite to the inner edge surface 10a. The outer edge portion 10c of the base end portion 11 extends linearly in the extending direction and has an outer edge surface 11b located above the center of curvature of the curved portion 13 in a suspended state. The outer edge portion 10c of the tip portion 12 extends linearly in the extending direction and has an outer edge surface 12b located from below to above the center of curvature of the curved portion 13 in a suspended state. The outer edge surface 11b and the outer edge surface 12b are in a parallel positional relationship facing outward from each other.

[0099] As a result, the linear outer edge surface 11b of the base end portion 11 and the linear outer edge surface 12b of the tip end portion 12 are parallel, making it easier for the operator to grip and hold the suspension hook 10, and improving workability.

[0100] Further, since the linear outer edge surface 11b of the base end portion 11 and the linear outer edge surface 12b of the tip end portion 12 are parallel, when the operator slides a finger while holding the suspension hook 10 by hand, it is easy to detect that the suspension hook 10 has deformed and its dimensions have changed.

[0101] Also, in the unlikely event that the suspension hook 10 opens and the opening distance increases, it becomes non - parallel. Therefore, compared with the case where something that was not originally parallel changes, it is easier to notice the change. Thus, it becomes easier to visually detect an abnormality in the opening distance, and the safety of the suspension hook 10 can be improved.

[0102] (2) Hook for inspection jig A base end portion 11 extending downward from the suspension connection portion 32 in a suspended state, A curved portion 13 extending from the lower end of the base end portion 11 and curved in an arc shape from one end toward the other end, A tip end portion 12 connected to the other end of the curved portion 13 and extending upward, An inner portion 30 surrounded by the base end portion 11, the curved portion 13, and the tip end portion 12, is provided, The base end portion 11, the curved portion 13, and the tip end portion 12 have an inner edge surface 10a in contact with the inner portion 30 and an outer edge portion 10c on the side opposite to the inner edge surface 10a. The outer edge portions 10c of the base end portion 11 and the tip end portion 12 have outer edge surfaces 11b and 12b that extend linearly. The outer edge surface 11b which is the outer edge portion 10c of the base end portion 11 and the outer edge surface 12b which is the outer edge portion 10c of the tip end portion 12 are parallel to each other. For the inspection jig 90 that inspects the opening of the suspension hook 10, the opposing inner surfaces 92a of the insertion portions 91f inserted from the curved portion 13 side are parallel. The hanging hook 10 can be inserted into the insertion portion 91f only when the opening angle of the hanging hook 10 is such that both the outer edge surface 11b extending linearly at the base end portion 11 and the outer edge surface 12b extending linearly at the tip end portion 12 are in sliding contact parallel to the inner surface 92a.

[0103] Accordingly, by using the inspection jig 90 with the inner surfaces 92a being parallel, it is possible to inspect the opening of the hanging hook 10 having linear outer edge surfaces 11b and 12b parallel to each other at the base end portion 11 and the tip end portion 12. Therefore, the hanging hook 10 is inserted into the insertion portion 91f only when the outer edge surface 11b extending linearly at the base end portion 11 and the outer edge surface 12b extending linearly at the tip end portion 12 are both in sliding contact parallel to the inner surface 92a.

[0104] Therefore, when the opening distance of the hanging hook 10 exceeds the limit opening distance, it is possible to prevent the hanging hook 10 from being inserted into the inspection jig 90 at an angle other than the proper angle of the hanging hook 10 and being determined to be usable despite reaching the usage limit of the hanging hook 10. Thus, it is possible to simply and accurately determine the abnormality of the opening of the hanging hook 10.

[0105] Also, it is possible to determine whether or not the opening distance of the hanging hook 10 exceeds the limit opening distance without using a measuring instrument such as a caliper. Furthermore, it is possible to inspect whether or not the opening distance is equal to or less than the limit opening distance without knowing the specific opening distance of the hanging hook 10, thus simplifying the work of the operator.

[0106] (3) Recess Moreover, it is possible to provide a base end side recess 14 formed on the outer edge surface 11b and a tip end side recess 15 formed on the outer edge surface 12b.

[0107] Thus, when measuring the distance between the base-end side recess 14 and the tip-end side recess 15 using calipers, it can be measured by sandwiching from the outside of the suspension hook 10. Therefore, the calipers will not shift, and the opening distance of the suspension hook 10 can be stably and accurately measured in a simple manner.

[0108] In addition, since the base-end side recess 14 and the tip-end side recess 15 are formed on the outside of the suspension hook 10, the measurement location can be confirmed at a glance, so the time required for the measurement work can be shortened.

[0109] In addition, since the base-end side recess 14 and the tip-end side recess 15 are formed on the outside of the suspension hook 10, compared with the case where they are formed on the surface between the outside and the inside, they blend in without a sense of incongruity in terms of design, so the design quality can be improved.

[0110] Also, since both the base-end side recess 14 and the tip-end side recess 15 are formed on the linear outer edge surfaces 11b and 12b, compared with the case where they are formed on a curved outer edge surface, it is easier to set the calipers in the base-end side recess 14 and the tip-end side recess 15. Even if the calipers float out from the base-end side recess 14 and the tip-end side recess 15, they will not slide in a direction away, and can immediately return to the inside of the base-end side recess 14 and the tip-end side recess 15.

[0111] (4) Bending force In addition, the base-end side recess 14 can be formed on the side of the connecting portion 32 from the position 19 where the bending force acting on the suspension hook 10 is maximum.

[0112] Thereby, since the base-end side recess 14 is arranged at a position that is relatively difficult to deform by the bending force, the opening distance of the suspension hook 10 can be measured between the base-end side recess 14 and the tip-end side recess 15 that is relatively easy to deform by the bending force, and the opening distance of the suspension hook 10 can be measured more accurately.

[0113] (5) Numbers on the thin part Further, it has a thick portion 17 formed on the inner edge surface 10a and a thin portion 16 thinner than the thick portion 17 formed on the outer edge portion 10c. The base end side recess 14 and the tip end side recess 15 are formed in the thin portion 16, and information regarding the hanging hook 10 can be marked on the thin portion 16.

[0114] As a result, since the area of the thin portion 16 at the base end portion 11 is the largest, information regarding the hanging hook 10 can be displayed larger, and visibility can be improved.

[0115] Also, since information can be marked near the base end side recess 14, if the marked information is related to the opening distance of the hanging hook 10, when measuring the opening distance of the hanging hook 10 with a caliper, the reference value will be displayed near the base end side recess 14, so workability can be improved.

[0116] Also, since the base end side recess 14, the tip end side recess 15, and the thin portion 16 are formed, the dimensions of the base end side recess 14 and the tip end side recess 15 in the thickness direction of the hanging hook 10 can be reduced. As a result, it becomes easier to align the caliper with the bottom surfaces of the base end side recess 14 and the tip end side recess 15, so the measurement work with the caliper can be simplified.

[0117] (6) Deformation detection 1, 2 Further, it has a thick portion 17 formed on the inner edge surface 10a and a thin portion 16 thinner than the thick portion 17 formed on the outer edge portion 10c, and includes linear boundary straight portions 18c provided at the base end portion 11 and the tip end portion 12 respectively, which are part of the boundary portion 18 between the thick portion 17 and the thin portion 16. The outer edge surface 11b and the outer edge surface 12b are the first deformation detection portions for detecting deformation of the hanging hook 10, and the boundary straight portion 18c can be the second deformation detection portion for visually detecting deformation of the hanging hook 10.

[0118] As a result, since the easily visible boundary straight line portion 18c is the second deformation detection portion, it becomes easy to notice the deformation of the suspension hook 10 visually. Therefore, when deformation of the suspension hook 10 is suspected when the second deformation detection portion is visually inspected, by performing measurement in the first deformation detection portion, breakage of the suspension hook 10 can be further prevented and safety can be enhanced.

[0119] Furthermore, the inspection jig 90 has a groove portion 92 that restricts movement of the suspension hook 10 in directions other than the insertion direction, and the thick portion 17 has a shape that cannot enter the groove portion 92. For this reason, when the opening distance of the suspension hook 10 exceeds the limit opening distance, when inserting the suspension hook 10 into the inspection jig 90, at the boundary straight line portion 18c on the base end side of the thick portion 17 and the thin portion 16 of the suspension hook 10, it gets caught on the groove portion 92 (the boundary portion between the inner plane 93 and the inner plane 94) of the inspection jig 90 and thus cannot be inserted. For this reason, the boundary straight line portion 18c also functions as the second deformation detection portion even when inspecting using the inspection jig 90, and since the inspection accuracy can be improved, safety can be enhanced.

[0120] (7) Boundary straight line portion 1 Also, the boundary straight line portions 18c can be parallel to each other.

[0121] As a result, when the suspension hook 10 opens and the opening distance increases, since the boundary straight line portions 18c become non - parallel, compared to the case where those that were not originally parallel change, it becomes easier to notice the change. Thus, it becomes easier to visually detect an abnormality in the opening distance, and the safety of the suspension hook 10 can be improved.

[0122] (8) Boundary straight line portion 2 Also, the boundary straight line portions 18c are formed to be inclined so as to approach each other as they move away from the curved portion 13, and can approach parallel to each other when the suspension hook 10 is deformed.

[0123] As a result, when the suspension hook 10 opens and the opening distance increases, the boundary straight line portion 18c becomes a parallel shape that is easy to visually confirm, so that deformation of the suspension hook 10 can be detected earlier.

[0124] (9) Deformation detection 3 Further, a support shaft 22 is provided at the base end portion 11 and rotates to include a hook latch 21 that abuts against the tip end portion 12. The portion of the tip end portion 12 where the hook latch 21 abuts can function as a third deformation detection portion for visually detecting deformation of the suspension hook 10.

[0125] As a result, in the portion of the tip end portion 12 where the hook latch 21 abuts, scratches, paint peeling, etc. occur due to the hook latch 21 repeatedly abutting and separating. When the suspension hook 10 opens and the opening distance increases, the position of such scratches changes. Therefore, since the deformation of the suspension hook 10 can be confirmed by simply visually observing the position of such scratches, the deformation of the suspension hook 10 can be detected earlier.

[0126] (10) Flat portion Also, it has a thick portion 17 formed on the inner edge surface 10a and a thin portion 16 thinner than the thick portion 17 formed on the outer edge surface 11b. From the outer edge surface 11b upward, the thin portion 16 extends in a flat plate shape wider than other portions, and information regarding the suspension hook 10 can be three-dimensionally marked on the thin portion 16 in a convex shape or a concave shape from the surroundings.

[0127] As a result, the thin portion 16 extending upward from the linear outer edge surface 11b of the base end portion 11 of the hanging hook 10 is wider and extends in a flat plate shape than other portions, so that an operator can easily grip the hanging hook 10 by a gripping operation such as pinching with, for example, the thumb and index finger. Further, since information about the hanging hook 10 is marked in a convex shape or a concave shape on the thin portion 16, when the operator grips the thin portion 16, the fingers are caught by the convex shape or the concave shape and function as a slip prevention, and it is possible to prevent the hanging hook 10 from slipping off the fingers. Therefore, the workability of the work performed by gripping the hanging hook 10 can be improved.

[0128] (11) Angle θb Also, the angle θb formed between the horizontal plane and the outer edge surface 11b in the suspended state can be set to 75° ± 5°.

[0129] Thereby, the dimension of the opening of the hanging hook 10 can be set to an appropriate value. That is, when the above angle is decreased, the dimension of the opening becomes larger, but the hanging depth of the hanging tool becomes shallower, so that a wire rope or the like hooked on the hanging tool is likely to come off. Further, when the angle of the outer edge surface 12b of the tip portion 12 is decreased with the angle with respect to the X-X axis of the opening being fixed at the angle of the present embodiment, the dimension between the inner edge surface 10a and the outer edge surface 12b of the tip portion 12 becomes larger, and a wasteful portion larger than the dimension required to secure the necessary strength is formed, resulting in an increase in weight and cost. On the other hand, when the above angle is increased, the tip portion 12 stands more, so the dimension of the opening becomes smaller, but in order to secure an appropriate dimension of the opening, it is necessary to increase the total length of the hanging hook 10 in the vertical direction, and the weight of the hanging hook 10 increases or the cost rises.

[0130] Therefore, the angle formed between the horizontal plane and the outer edge surface 11b is set to 75° ± 5°, and preferably, it is set in the range of 72° to 78°.

[0131] This can prevent the detachment of a wire rope or the like hooked on the suspension hook 10, while suppressing the vertical dimension of the suspension hook 10 to avoid an increase in weight and cost.

[0132] (12) Concave position In addition, a support shaft 22 as a rotation shaft is provided at the base end portion 11, and a hook latch 21 that abuts against the tip end portion 12 by rotating is provided. In a state where the hook latch 21 abuts against the narrow portion 24 of the tip end portion 12, the base end side concave portion 14 and the tip end side concave portion 15 can be provided at positions where a straight line connecting the base end side concave portion 14 and the tip end side concave portion 15 does not interfere with the hook latch 21.

[0133] This makes it easier to perform the dimension measurement work because the hook latch does not interfere when measuring the dimension between the base end side concave portion 14 and the tip end side concave portion 15 using a caliper or a ruler.

[0134] (13) Hook with a concave portion A suspension hook 10 having a thick portion 17 extending toward the inner diameter side and a thin portion 16 extending thinner than the thick portion 17 on the outer diameter side of the thick portion 17, A base end portion 11 that extends downward from the connecting portion 32 for suspension and has a base end side concave portion 14 on the outer edge surface 11b, A tip end portion 12 facing the base end portion 11 and having a tip end side concave portion 15 on the outer edge surface 12b, is provided.

[0135] This allows the distance between the base end side concave portion 14 and the tip end side concave portion 15 to be measured by sandwiching from the outside of the suspension hook 10 when measuring with a caliper. Therefore, the caliper does not shift, and the opening distance of the suspension hook 10 can be stably and accurately measured by a simple method.

[0136] In addition, since the base end side concave portion 14 and the tip end side concave portion 15 are formed on the outside of the suspension hook 10, the measurement location can be confirmed at a glance, so the time required for the measurement work can be shortened.

[0137] In addition, since the base-end side recess 14 and the tip-end side recess 15 are formed outside the hanging hook 10, they blend in without a sense of incongruity on the surface between the outside and the inside, so the design can be improved.

[0138] (14) Inspection jig An inspection jig 90 for inspecting the opening of the hanging hook 10, A main body portion 91 having a housing portion 91b for inserting and housing the hanging hook 10 therein, Groove portions 92 provided at both end sides in the width direction of the housing portion 91b, formed inside the main body portion 91 and linearly extending in the insertion direction to prevent movement of the hanging hook 10 in a direction other than the insertion direction, is provided with, When the hanging hook 10 is housed in the housing portion 91b, the inner surfaces 92a of a pair of groove portions 92 facing each other in the radial direction of the hanging hook 10 are parallel to each other, and the distance between the inner surfaces 92a is set so that the hanging hook 10 can slide.

[0139] Thereby, the hanging hook 10 having parallel surfaces facing each other at both radial ends of the outer edge surfaces 11b, 12b is inserted into the groove portion 92, and the outer edge surfaces 11b, 12b of the hanging hook 10 slide with respect to the inner surface 92a of the groove portion 92. Therefore, by setting the dimension between the inner surfaces 92a in advance to the limit opening distance of the opening distance of the hanging hook 10, when the opening distance exceeds the limit opening distance, the hanging hook 10 cannot be inserted into the groove portion 92, so the opening of the hanging hook 10 can be easily and accurately discriminated.

[0140] In addition, since the inner surfaces 92a of the groove portions 92 are parallel to each other, the parallel outer edge surfaces 11b and 12b at both radial ends of the hanging hook 10 cannot be inserted into the inspection jig 90 unless they have a specific inclination parallel to the inner surfaces 92a of the groove portions 92. Therefore, even when the opening distance becomes slightly longer, the hanging hook 10 cannot be inserted into the inspection jig 90 unless it has a specific inclination. Thus, it is possible to accurately determine whether the distance L between the parallel outer edge surfaces 11b and 12b at both radial ends of the hanging hook 10, which changes in synchronization with the opening distance, is longer than the reference value Lmax.

Explanation of Signs

[0141] 10 Hanging hook 10a Inner edge surface (inner peripheral portion) 10c Outer edge portion (outer peripheral portion) 11 Base end portion 11b Outer edge surface (first outer peripheral surface) 12 Tip end portion 12b Outer edge surface (second outer peripheral surface) 13 Curved portion 14 Base end side recess 15 Tip end side recess 16 Thin portion 17 Thick portion 18c Boundary straight line portion 19 Position where the bending force is maximum 21 Hook latch 22 Support shaft (rotation shaft) 30 Inner portion 32 Connecting portion 90 Inspection jig 91 Main body portion 91b Accommodating portion 91f Insertion portion 92 Groove portion 92a Inner surface

Claims

1. A base end portion that extends downward from the connecting portion for hanging in a hanging state; a curved portion extending from a lower end of the base portion and curved in an arc shape from the lower end to the other end; a tip portion connected to the other end of the curved portion and extending upward; an inner portion surrounded by the base end portion, the curved portion, and the tip portion; Equipped with The base end portion, the curved portion, and the tip portion each have an inner periphery portion that contacts the inner portion, and an outer periphery portion opposite the inner periphery portion, The outer circumferential portion of the base end portion has a first outer circumferential surface that extends linearly in the extension direction and is located above the center of curvature of the curved portion in a suspended state, The outer circumferential portion of the tip portion has a second outer circumferential surface that extends linearly in the extension direction and is located from below to above the center of curvature of the curved portion in a suspended state, The first outer peripheral surface and the second outer peripheral surface are in a positional relationship in which they face outward and are parallel to each other. A hanging hook characterized by the above.

2. A base end portion that extends downward from the connecting portion for hanging in a hanging state; a curved portion extending from a lower end of the base portion and curved in an arc shape from the lower end to the other end; a tip portion connected to the other end of the curved portion and extending upward; an inner portion surrounded by the base end portion, the curved portion, and the tip portion; Equipped with The base end portion, the curved portion, and the tip portion each have an inner periphery portion that contacts the inner portion, and an outer periphery portion opposite the inner periphery portion, The outer periphery of the base end portion and the outer periphery of the tip end portion have outer periphery surfaces that extend linearly, a first outer circumferential surface which is the outer circumferential surface of the base end portion and a second outer circumferential surface which is the outer circumferential surface of the tip end portion are parallel to each other, The inspection jig for inspecting the opening of the hanging hook has an insertion part that is inserted from the curved part side, and the opposing inner surfaces of the insertion part are parallel to each other, The hanging hook can be inserted into the insertion portion only when the opening angle of the hanging hook is an angle at which the linearly extending outer circumferential surface of the base end portion and the linearly extending outer circumferential surface of the tip end portion are both in sliding contact with the inner surface in parallel. A hanging hook characterized by the above.

3. The hanging hook according to claim 1 or 2, a base end recess formed on the first outer circumferential surface; a tip side recess formed on the second outer circumferential surface; A hanging hook comprising:

4. The hanging hook according to claim 3, The base end recess is formed on the connecting portion side from a position where a bending force acting on the hanging hook is maximum. A hanging hook characterized by the above.

5. The hanging hook according to claim 3, a thick portion formed on the inner periphery and a thin portion formed on the outer periphery that is thinner than the thick portion, the base end recess and the tip end recess are formed in the thin portion, The thin portion has information about the hanging hook written on it. A hanging hook characterized by the above.

6. The hanging hook according to claim 1 or 2, a thick-walled portion formed on the inner circumferential portion and a thin-walled portion formed on the outer circumferential portion that is thinner than the thick-walled portion, and a linear boundary portion that is a part of a boundary between the thick-walled portion and the thin-walled portion and is provided at each of the base end and the tip end, the first outer circumferential surface and the second outer circumferential surface are a first deformation detection portion that detects deformation of the hanging hook, The boundary straight line portion is a second deformation detection portion that visually detects deformation of the hanging hook. A hanging hook characterized by the above.

7. 7. The hanging hook according to claim 6, The boundary straight lines are parallel to each other, which indicates that an overload has been applied. A hanging hook characterized by the above.

8. 7. The hanging hook according to claim 6, The boundary straight line portions are formed with an inclination so as to approach each other as they move away from the curved portion, and approach each other in parallel when the hanging hook is deformed. A hanging hook characterized by the above.

9. The hanging hook according to claim 1 or 2, A hook latch is provided at the base end portion and rotates to abut against the tip end portion, The portion of the tip end with which the hook latch abuts functions as a third deformation detection portion that visually detects deformation of the hanging hook. A hanging hook characterized by the above.

10. The hanging hook according to claim 1 or 2, a thick portion formed on the inner periphery and a thin portion formed on the outer periphery that is thinner than the thick portion, The thin portion extends upward from the first outer circumferential surface in a flat plate shape having a width greater than other portions, The thin portion has information about the hanging hook three-dimensionally written in a convex or concave shape from the surrounding area. A hanging hook characterized by the above.

11. The hanging hook according to claim 1 or 2, In the suspended state, the angle between the horizontal plane and the first outer circumferential surface is set to 75°±5°. A hanging hook characterized by the above.

12. The hanging hook according to claim 3, A hook latch is provided at the base end portion and rotates to abut against the tip end portion, When the hook latch is in contact with the tip end portion, the base end recess and the tip end recess are provided at positions such that a straight line connecting the base end recess and the tip end recess does not interfere with the hook latch. A hanging hook characterized by the above.

13. A hanging hook having a thick portion extending toward an inner diameter side and a thin portion extending toward an outer diameter side from the thick portion and thinner than the thick portion, A base end portion that extends downward from the connecting portion for hanging and has a base end recess on an outer circumferential surface; a tip end portion facing the base end portion and having a tip end recess on an outer circumferential surface; A hanging hook comprising:

14. An inspection jig for inspecting the opening of a hanging hook, a main body portion including a storage portion into which the hanging hook is inserted and stored; a groove portion provided on both ends of the accommodation portion in the width direction, formed inside the main body portion, extending linearly in the insertion direction, and preventing the suspension hook from moving in any direction other than the insertion direction; Equipped with When the hanging hook is accommodated in the accommodation section, inner surfaces of a pair of the groove sections facing each other in a radial direction of the hanging hook are parallel to each other, and a distance between the inner surfaces is set so that the hanging hook makes sliding contact therewith. An inspection tool characterized by:

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