Anti-detachment device and anti-detachment system

Abstract

[Problem] To achieve all of reduction in manufacturing cost, easy disengagement from bolts and nuts, and prevention of loosening of bolts and nuts. [Solution] The present invention comprises: a tool coil spring part 100 having a shape corresponding to the inner wall shape of a socket of an attachment / detachment tool; a circular bolt coil spring part 200 that is brought into contact with a threaded groove of a bolt 1000; a polygonal nut coil spring part 300 that is brought into contact with a side surface of a nut 2000; and a linking part 400 that links the bolt coil spring part and the nut coil spring part together. The nut coil spring part 300 has a tip section 310 from the tip to the boundary with respect to the linking part. The tip section is positioned across adjacent side-surface edges 2100, 2200 of the nut 2000.

Description

Technical Field

[0001] The present invention relates to a fall prevention tool and a fall prevention system, and particularly to a fall prevention tool and a fall prevention system for preventing a nut from falling off a bolt.

Background Art

[0002] Patent Document 1 discloses a fall prevention tool 1 having the following configuration. That is, with reference to FIG. 1 thereof, the fall prevention tool 1 has, from top to bottom, a second coil spring portion 3 in which a second coil wire 3A is formed in a substantially triangular shape, a first coil spring portion 2 in which a first coil wire 2A is formed in a substantially circular shape, a third coil spring portion 4 in which a third coil wire 4A is formed in a substantially triangular shape, an extension portion 5 in which an extension coil wire extends in the vertical direction, a fourth coil spring portion 6 in which a fourth coil wire 6A is formed in a substantially hexagonal shape, and is configured to be located.

[0003] Here, the fall prevention tool 1 is for preventing a nut 22 fastened to a bolt 21 from falling off therefrom (paragraph 0001), but as shown in FIG. 3 of Patent Document 1, the third coil spring portion 4 abuts on the upper surface of the nut 22 to prevent loosening (paragraph 0050).

[0004] Note that in the fall prevention tool 1 of Patent Document 1, it is described that the fall prevention tool 1 can be attached to the bolt 21 to which the nut 22 is fastened using a general socket tool such as a socket wrench (paragraphs 0013, 0021, 0043, 0047 to 0049).

[0005] Furthermore, looking at FIG. 1 of Patent Document 1, it can be evaluated that the three respective tops 3B of the second coil spring portion 3, the three respective tops 4B, 4C, 4D of the third coil spring portion 4, and the corresponding three tops 6B of the fourth coil spring portion 6 are designed to be aligned along the axial direction of the fall prevention tool 1.

[0006] If this assessment is correct, the reason for this design is understood to be that the inner wall of the socket has 12 grooves formed to correspond to common nuts (for example, hexagonal nuts or dodecagonal nuts), and that a pair of corresponding tops 3B, 4B, etc., 6B fit into the same groove. [Prior art documents] [Patent Documents]

[0007] [Patent Document 1] Japanese Patent Publication No. 2020-012545 [Disclosure of the Invention] [Problems that the invention aims to solve]

[0008] However, in the manufacturing process of the fall prevention device 1, the bending work required to align the three points such as the top 3B, 4B, and 6B is difficult and time-consuming, so it is undeniable that manufacturing costs will be high.

[0009] Furthermore, when the anti-loosening device 1 is used, it deforms to some extent when attached to a bolt 21 fastened with a nut 22, causing misalignment of the corresponding tops 3B, 4B, etc., 6B. Therefore, when attempting to remove the anti-loosening device 1 attached to the bolt 21 using a socket tool, it is undeniable that it is difficult to ensure that all of the corresponding tops 3B, 4B, etc., 6B fit into the same groove of the socket.

[0010] For these reasons, the inventor of Patent Document 1 likely considered whether any of the second coil spring section 3 to the fourth coil spring section 6 could be excluded by alternative modifications to other components, and thus created the fall prevention device 1 by adopting an approach of excluding the fourth coil spring section 6, as shown in Figure 4.

[0011] However, the invention described in Patent Document 1 solves the problem that simply pressing the upper surface of the nut 22 may not provide sufficient anti-loosening effect (paragraph 0009). Therefore, the approach of excluding the fourth coil spring portion 6 (paragraph 0048), which directly prevents rotation by contacting the side surface of the nut 22, is a backward-looking change because it impairs the anti-rotation effect.

[0012] Upon closer examination, if the fourth coil spring portion 6 is not excluded, and rotational force is applied to the nut 22, the force will be applied evenly and comprehensively, from the fourth coil spring portion 6 through the extension portion 5 towards the third coil spring portion 4. As a result, the fall prevention device 1 is less likely to deform plastically, and the fall prevention device 1 is more likely to return to its original state from the deformed state. Therefore, it is thought that the rotation of the nut 22 can be effectively prevented.

[0013] In contrast, when the fourth coil spring portion 6 is excluded and rotational force is applied to the nut 22, the force is applied locally and concentratedly to the boundary between the extension portion 5 and the third coil spring portion 4. As a result, the anti-detachment device 1 is prone to plastic deformation, and it is difficult for the anti-detachment device 1 to return to its original state from the deformed state. Therefore, it is unlikely that the rotation of the nut 22 can be effectively prevented.

[0014] Therefore, it seems more rational to adopt the approach of excluding the third coil spring portion 4 rather than adopting the approach of excluding the fourth coil spring portion 6. Although the approach of excluding the second coil spring portion 3 was also considered, the inventors have not yet come up with a clever way to replace its function of allowing the anti-drop device 1 to be attached and detached using a general socket tool (paragraph 0021, etc.) by changing other components.

[0015] Therefore, while adopting an approach of excluding the third coil spring portion 4, the present invention provides a detachment prevention tool that maintains an effect equivalent to that of preventing rotation in the loosening direction by abutting against the upper surface of the nut 22 included in the third coil spring portion 4.

Means for Solving the Problems

[0016] In order to solve the above problems, the detachment prevention tool of the present invention includes a coil spring portion for a tool having a shape corresponding to the inner wall shape of the socket of the attachment / detachment tool, a circular coil spring portion for a bolt that abuts against the thread groove of the bolt, a polygonal coil spring portion for a nut that abuts against the side surface of the nut, a connecting portion that connects the coil spring portion for the bolt and the coil spring portion for the nut, and for the coil spring portion for the nut, the tip portion from the tip to the boundary with the connecting portion is located across the adjacent side surface of the nut.

[0017] The coil spring portion for the tool has a triangular shape The coil spring portion for the nut may have a hexagonal shape.

[0018] The length of the tip portion may be 1.5 times or more the width of the side surface of the nut.

[0019] The detachment prevention system of the present invention includes the above detachment prevention tool, a bolt and a nut to which the detachment prevention tool is attached, and

Brief Description of the Drawings

[0020] [Figure 1] It is a front view of the detachment prevention tool of the embodiment of the present invention. [Figure 2] It is a rear view of the detachment prevention tool of the embodiment of the present invention. [Figure 3] It is a right side view of the detachment prevention tool of the embodiment of the present invention. [Figure 4] This is a left-hand view of a fall prevention device according to an embodiment of the present invention. [Figure 5] This is a plan view of a fall prevention device according to an embodiment of the present invention. [Figure 6] This is a bottom view of a fall prevention device according to an embodiment of the present invention. [Figure 7] This is a perspective view of a fall prevention device according to an embodiment of the present invention. [Figure 8] This is an explanatory diagram showing examples of dimensions for each part of the fall prevention device according to an embodiment of the present invention. [Figure 9] This figure shows the bolt 1000 and nut 2000 with the anti-detachment device shown in Figure 1 attached. [Explanation of symbols]

[0021] 100 Tool Coil Spring Section 200-volt coil spring section 300 Coil spring section for nuts 310 Tip 400 Connection section 1000 volts 2000 nuts 2100,2200 Embodiment of the adjacent side edge invention

[0022] Hereinafter, an embodiment of the fall prevention device of the present invention will be described with reference to the drawings.

[0023] Figures 1 to 7 all show the external appearance of the fall prevention device, with Figure 1 being a front view, Figure 2 a rear view, Figure 3 a right side view, Figure 4 a left side view, Figure 5 a top view, Figure 6 a bottom view, and Figure 7 a perspective view.

[0024] The anti-dropping device is broadly classified into the following components: a coil spring section 100 for tools, a coil spring section 200 for bolts, a coil spring section 300 for nuts, and a connecting section 400. This anti-dropping device is manufactured, for example, by winding coil wires of approximately the same diameter and predetermined length, made of stainless steel (such as SUS304).

[0025] The tool coil spring section 100 is, for example, the part in which the coil wire is wound once in a plan view in a shape that is, for example, an equilateral triangle (more precisely, the midpoint of each side is convex outwards), as shown in Figure 5.

[0026] The tool coil spring section 100 is housed in the socket of a fastening tool, such as a socket wrench (not shown), when attaching or detaching the anti-loosening device to a bolt 1000 (see Figure 9) that has been fastened with a nut 2000 (see Figure 9).

[0027] The shape of the tool coil spring portion 100 does not necessarily have to be triangular; it can be square or octagonal, for example, as long as it corresponds to the shape of the inner wall of the socket. Furthermore, the number of turns of the tool coil spring portion 100 does not necessarily have to be one; it can be two, for example.

[0028] The bolt coil spring section 200 is a part that is continuous with the tool coil spring section 100, as shown in Figure 5, for example, and in which the coil wire is wound in a circular shape in a plan view, for example, about four times.

[0029] In this example, the bolt coil spring section 200 includes a small circular section of approximately two turns and a large circular section of slightly less than one turn. However, the number of turns in the bolt coil spring section 200 is illustrative and may be more or less than this.

[0030] Furthermore, the bolt coil spring section 200 has a diameter slightly smaller than the outer diameter of the threaded portion of the bolt 1000, so that the nut 2000 makes contact with the threaded groove of the bolt 1000 under pressure.

[0031] The coil spring portion 300 for the nut is, for example, as shown in Figure 5, a portion in which the coil wire is wound approximately 1.25 times in a hexagonal shape in a plan view, and its total length is approximately 7.5 sides of the hexagonal shape, and it includes a tip portion 310 that is approximately 0.25 turns long, with one end being the tip and the other end being perpendicular to the connecting portion 400.

[0032] The coil spring portion 300 for the nut is in contact with the side surface of the nut 2000 fastened to the bolt 1000, with its tip portion 310 in contact with adjacent side surfaces 2100 and 2200 of the nut 2000.

[0033] The length of the tip portion 310 depends on the thickness and strength of the wire material constituting the anti-loosening device, but it is preferable that the length be at least 1.5 times the circumferential length (width) of the adjacent side edges 2100 and 2200 in order to reliably prevent loosening from the bolt 1000 and nut 2000.

[0034] Furthermore, a gripping portion for gripping the fall prevention device may be provided, continuous with the tip portion 310. The gripping portion is not limited to this, but it is conceivable that it be circular in shape with a diameter of about 1 cm.

[0035] The shape of the coil spring portion 300 for the nut does not necessarily have to be hexagonal; for example, it could be dodecagonal, as long as it corresponds to the shape of the nut 2000.

[0036] In this embodiment, the reason for providing the tip portion 310 is to give the coil spring portion 300 for the nut sufficient strength to resist deformation even when force is applied to it, thereby preventing the nut 2000 from loosening.

[0037] Furthermore, as can be intuitively understood by those skilled in the art by looking at Figure 1 of Patent Document 1, the length of the coil wires of the fourth coil spring portion 6, which corresponds to the "nut coil spring portion 300," is only slightly less than six and a half sides of the fourth coil spring portion 6. Therefore, even when the third coil spring portion 4 is absent, the fourth coil spring portion 6 can be appropriately deformed.

[0038] The connecting portion 400 extends, for example, in a direction perpendicular to the plane direction of the bolt coil spring portion 200 and the nut coil spring portion 300, as shown in Figure 1, and is the portion that connects the bolt coil spring portion 200 and the nut coil spring portion 300.

[0039] The precise dimensions of each part of the fall prevention device will be explained later, but for example, as shown in Figure 1, the thickness of the connecting part 400 is approximately the same as the thickness of the tool coil spring part 100 and the bolt coil spring part 200, but it may be thicker or not.

[0040] However, if the thickness of the connecting portion 400 is set to the extent shown in Figure 1, the coil spring portion 300 for the nut will be positioned at approximately half the height of the nut 2000, making it possible to stably attach the anti-loosening device to the bolt 1000 and the nut 2000.

[0041] Furthermore, as shown in Figure 5, for example, the axes of the tool coil spring section 100, the bolt coil spring section 200, and the nut coil spring section 300 are approximately aligned. Therefore, the ratio of the diameter of the tool coil spring section 100, the side length of the bolt coil spring section 200, and the side length of the nut coil spring section 300 is geometrically approximately 1:2√3 (≒3.46):2.

[0042] Figure 8 is an explanatory diagram illustrating the dimensions of each part of the anti-loosening device. The dimensions of each part of the anti-loosening device can be as follows, assuming that the nut 2000 is of the M22 fine-thread nut type (size).

[0043] <Coil strands> Wire diameter (d): φ1.80±0.02mm, <Tool coil spring section 100> Inner diameter (ID): φ18.90-0.2mm to φ18.90+0mm <Coil spring section for bolt 200> Number of coil turns: 3.289 <300mm coil spring section for nuts> Side length (S): 32.00 mm <Connection part 400> Thickness (m): Length from the bottom surface of the bolt coil spring section 200 to the bottom surface of the nut coil spring section 300): 18.00 mm

[0044] For reference, Table 1 summarizes examples of dimensions for each part of the anti-loosening device for sizes other than M22 fine thread. Note that the values ​​shown in Table 1 are just examples; for example, when using a larger nut, you should increase the side length (S) and thickness (m) accordingly, and decrease the number of coil turns.

[0045] For example, in the case of a so-called M12 special nut, possible modifications include changing the side length (S) to 24.00 mm, the thickness (m) to 11.00 mm, and the number of coil turns to 3.210.

[0046] [Table 1]

[0047] Figure 9 shows the anti-loosening device shown in Figure 1, etc., attached to the bolt 1000 and nut 2000. This anti-loosening device is attached to the bolt 1000 and nut 2000 using a socket (not shown) and through a tool coil spring section 100.

[0048] Specifically, as shown in Figure 9, the bolt coil spring portion 200 of this anti-drop device comes into contact with the threaded groove of the bolt 1000, the nut coil spring portion 300 comes into contact with the side surface of the nut 2000, and further, the tip portion 310 comes into contact with adjacent side surfaces 2100 and 2200 of the nut 2000. However, in the installed state, no misalignment occurs between the tops of the tool coil spring portion 100 and the nut coil spring portion 300.

[0049] Therefore, the anti-detachment device of this embodiment can be manufactured at a lower cost because it is easy to bend, can be easily detached from the bolt and nut, and prevents the bolt and nut from loosening.

Claims

1. A tool coil spring section shaped to match the inner wall shape of the socket of the detachable tool, A circular coil spring portion for bolts that contacts the threaded groove of the bolt, A polygonal coil spring portion for nuts that contacts the side surface of the nut, A connecting portion that connects the bolt coil spring portion and the nut coil spring portion, It has, The tops of the bolt coil spring portion and the connecting portion are not located between the corresponding tops of the tool coil spring portion and the nut coil spring portion, which are located in the same radial direction from their respective axes. The coil spring portion for the nut is a fall prevention device in which the tip portion, from the tip to the boundary with the connecting portion, is positioned along the adjacent side of the nut.

2. The aforementioned coil spring portion for the tool is triangular in shape. The coil spring portion for the nut has a hexagonal shape. The fall prevention device according to claim 1.

3. The length of the tip portion is 1.5 times or more the width of the side surface of the nut. The fall prevention device according to claim 1.

4. The fall prevention device according to claim 1, The bolt and nut to which the aforementioned anti-detachment device is attached, Equipped with, Anti-dropping system.

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