Nut fall prevention device

Abstract

To suppress a risk of incidentally continuing.SOLUTION: A nut fall-off preventing tool 10 is equipped with a ring portion 20, and a pair of continuing portions 22 and 22. The ring portion 20 has a wire. The wire annularly bends to form an annular portion 40 and a crossover place 42. The continuing portions 22 are provided so as to respectively continue to both ends of the wire of the ring portion 20. The pair of continuing portions 22 and 22 deforms so as to approach each other when the pair of continuing portions 22 and 22 receives force in a direction approaching each other. The pair of continuing portions 22 and 22 respectively projects so as to oppose to each other in directions intersecting a surface along the annular portion 40 of the ring portion 20.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a nut fall-off prevention device. [Background technology]

[0002] Patent Document 1 discloses a nut fall-off prevention device. This nut fall-off prevention device includes a spiral coil spring portion and a pair of ring-shaped pressing portions. The coil spring portion has an inner diameter smaller than the outer diameter of the threads of the bolt. The coil spring portion has an overlapping portion that partially overlaps in a planar view. The pressing portions are provided at both ends of the coil spring portion, facing each other and extending in a planar direction away from the central axis of the coil spring portion. This nut fall-off prevention device is configured so that the inner diameter of the coil spring portion is larger than the outer diameter of the thread when the pressing portions are brought close to each other. This allows the coil spring portion of this nut fall-off prevention device to be fitted along the thread groove of the bolt. At least one end of the pressing portions is provided with a linear protrusion that extends further toward the central axis than the coil spring portion. The nut fall-off prevention device disclosed in Patent Document 1 can be attached with one touch, has a simple structure, and is durable for long-term use.

[0003] Patent Document 2 discloses a nut fall-off prevention device. This nut fall-off prevention device is attached to the tip of a bolt to prevent the nut threaded onto the bolt from falling off. This nut fall-off prevention device is made of an elastic wire rod. This nut fall-off prevention device includes a ring portion and a pair of operating portions formed on both ends of the wire rod to operate the ring portion to expand its diameter. The ring portion is formed in the center of the wire rod. The ring portion grips the outer peripheral surface of the bolt. One end of the wire rod contacts the nut to restrict its movement, and is displaced in a direction that reduces the diameter of the ring portion due to frictional force caused by rotational force in the nut loosening direction. The nut fall-off prevention device disclosed in Patent Document 2 can prevent the nut and the nut from rotating together and falling off, even when the frictional force between them becomes large. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2009-52648 [Patent Document 2] Japanese Patent Application Publication No. 2019-203516 Summary of the Invention [Problem to be solved by the invention]

[0005] However, the nut fall-off prevention devices disclosed in Patent Documents 1 and 2 have a problem in that there is a high possibility that multiple nut fall-off prevention devices will accidentally connect with each other. The present invention solves this problem. An object of the present invention is to reduce the possibility of accidental connection. [Means for solving the problem]

[0006] The nut fall-off prevention device of the present invention will be described with reference to the drawings. Note that the reference numerals used in this section are intended to facilitate understanding of the invention and are not intended to limit the scope of the invention to the illustrated scope.

[0007] In order to solve the above-mentioned problems, according to one aspect of the present invention, a nut disengagement prevention device 10 includes a ring portion 20 and a pair of continuous portions 22, 22. The ring portion 20 has a wire material. This wire material is bent into a ring shape to form a ring portion 40 and an intersection 42. The continuous portions 22 are provided so as to be continuous with both ends of the wire material of the ring portion 20. When the pair of continuous portions 22, 22 receives a force in a direction that moves them toward each other, they deform so as to be able to move toward each other. The pair of continuous portions 22, 22 each protrude opposite each other along a direction that intersects with the plane along which the ring portion 40 of the ring portion 20 extends.

[0008] In addition, the minimum value D of the distance between the surfaces of the pair of continuous portions 22, 22 that are the back surfaces when viewed from the opposing surfaces of the pair of continuous portions 22, 22 is larger than the minimum value φA of the across distance in the direction perpendicular to the central axis L of the annular portion 40 between the opposing portions of the annular portion 40. Furthermore, the minimum value C of the spacing between the pair of continuous portions 22, 22 described above is smaller than the minimum value φB of the distance in the direction perpendicular to the central axis L of the annular portion 40 between points on the outer periphery of the annular portion 40 that are opposite each other when viewed from the center of the annular portion 40.

[0009] When the minimum value D of the distance between the surfaces of the pair of continuous portions 22, 22 that are the back faces of the opposing surfaces is greater than the minimum value φA described above, the possibility of the pair of continuous portions 22, 22 of a certain nut falling-off prevention device 10 entering the next-described portion is reduced. This portion is the annular portion 40 of the ring portion 20 of another nut falling-off prevention device 10 of the same size. This reduces the possibility of the pair of continuous portions 22, 22 of the former nut falling-off prevention device 10 being pressed against the annular portion 40 of the ring portion 20 of the latter nut falling-off prevention device 10, causing the former nut falling-off prevention device 10 and the latter nut falling-off prevention device 10 to become connected to each other. As a result, the risk of multiple nut falling-off prevention devices 10, 10 accidentally becoming connected to each other is reduced. [Effects of the Invention]

[0010] The present invention reduces the risk of accidental connections. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a plan view of a nut fall-off prevention device according to an embodiment of the present invention. [Figure 2] FIG. 1 is a side view of a nut fall-off prevention device according to an embodiment of the present invention. [Figure 3] FIG. 2 is a rear view of a nut fall-off prevention device according to an embodiment of the present invention. [Figure 4] 1 is a diagram showing a state in which a nut fall-off prevention device according to an embodiment of the present invention is fixed to a bolt. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0012] The present invention will be described in detail below with reference to the drawings. In the following description, the same components are designated by the same reference numerals. Their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

[0013] [Configuration Description] Fig. 1 is a plan view of a nut falling-off prevention device 10 according to an embodiment of the present invention. Fig. 2 is a side view of the nut falling-off prevention device 10 according to an embodiment of the present invention. Fig. 3 is a rear view of the nut falling-off prevention device 10 according to an embodiment of the present invention. The configuration of the nut falling-off prevention device 10 according to this embodiment will be described with reference to Figs. 1 to 3.

[0014] The nut falling-off prevention device 10 according to this embodiment includes a ring portion 20 and a pair of continuous portions 22, 22.

[0015] The ring portion 20 and the pair of continuous portions 22, 22 in this embodiment are made of wire. The ring portion 20 consists of the wire excluding both ends. These portions form the annular portion 40 and the intersection point 42. The nominal diameter of the bolt 120 suitable for use with the nut disengagement prevention device 10 in this embodiment is determined based on the minimum value φA of the span between opposing points in this annular portion 40 in a direction perpendicular to the central axis L of the annular portion 40.

[0016] The pair of continuous portions 22, 22 is formed from both ends of the wire material described above. More specifically, the pair of continuous portions 22, 22 according to this embodiment is formed by bending both ends of the wire material described above. As a result, the pair of continuous portions 22, 22 is provided so as to be continuous with each end of the portion constituting the ring portion 20. In this embodiment, the minimum value C of the spacing between the pair of continuous portions 22, 22 is smaller than the minimum value φB of the distance between locations on the outer periphery of the annular portion 40 that are opposite each other as viewed from the center of the annular portion 40, in a direction perpendicular to the central axis L of the annular portion 40. Meanwhile, the minimum value C of the spacing between the pair of continuous portions 22, 22 is larger than the minimum value φA of the across distance between opposing locations on the annular portion 40, in a direction perpendicular to the central axis L of the annular portion 40. Naturally, the minimum value D of the distance between the surfaces of the pair of continuous portions 22, 22 that correspond to the back surfaces when viewed from the opposing surfaces is greater than the minimum value φA of the span between the opposing portions of the annular portion 40 in a direction perpendicular to the central axis L of the annular portion 40.

[0017] The pair of continuous portions 22, 22 according to this embodiment are aligned and face each other. As is particularly clear from Figures 2 and 3, the pair of continuous portions 22, 22 according to this embodiment both rise from the ring portion 20. As a result, the pair of continuous portions 22, 22 according to this embodiment each protrude in a direction intersecting the plane along which the annular portion 40 of the ring portion 20 runs.

[0018] [Manufacturing method explanation] The nut fall-off prevention device 10 according to this embodiment is manufactured through a wire processing process in which a known wire is processed by a known method to form the ring portion 20 and the pair of continuous portions 22, 22 as shown in Figures 1 and 2.

[0019] [Instructions for use] The nut falling-off prevention tool 10 according to this embodiment is used to prevent a nut 122 that has been screwed onto a bolt 120 from coming off the bolt 120. The nut falling-off prevention tool 10 according to this embodiment is used in the following procedure.

[0020] The nut fall-off prevention device 10 according to this embodiment is often stored in a pocket or other storage means (not shown). This storage means often stores a large number of nut fall-off prevention devices 10 according to this embodiment. A person using the nut fall-off prevention device 10 according to this embodiment (hereinafter referred to as the "user") picks up one of the many nut fall-off prevention devices 10 from the storage means. The user pinches the pair of continuous portions 22, 22 of the nut fall-off prevention device 10 picked up from the storage means and brings them closer together. This causes the pair of continuous portions 22, 22 to be subjected to a force in a direction that draws them closer together. As a result of the pair of continuous portions 22, 22 receiving this force, the diameter of the annular portion of the ring portion 20 increases. In addition, the pairing member 24 is deformed to bend.

[0021] When the pair of spacers 24 deforms, the user fits the annular portion 40 onto the bolt 120 while pinching the pair of continuous portions 22, 22. Once the annular portion 40 is fitted onto the bolt 120, the user releases their hands from the pair of continuous portions 22, 22. When the user's hands are released from the pair of continuous portions 22, 22, the annular portion 40 returns to its original state. As the annular portion 40 returns to its original state, it tightens the bolt 120. As the annular portion 40 tightens the bolt 120, the nut falling-off prevention device 10 according to this embodiment is fixed to the bolt 120. FIG. 4 is a diagram showing the nut falling-off prevention device 10 according to this embodiment fixed to the bolt 120. When the nut falling-off prevention device 10 according to this embodiment is fixed to the bolt 120, movement of the nut 122 is hindered when the nut 122 loosens, and therefore, the nut 122 is prevented from falling off.

[0022] [Effect description] According to the nut falling-off prevention device 10 of this embodiment, the risk of multiple nut falling-off prevention devices 10, 10 accidentally connecting with each other is reduced.

[0023] <Description of Modified Examples> The above-described nut fall-off prevention device 10 is an example used to embody the technical concept of the present invention. The above-described nut fall-off prevention device 10 can be modified in various ways within the scope of the technical concept of the present invention.

[0024] For example, the continuous portion 22 may be made of a plate-like member attached to the end of the wire rod of the ring portion 20. The continuous portion 22 may have some other components in addition to the plate-like member. In other words, the configuration of the continuous portion 22 is not limited to that described above. [Explanation of symbols]

[0025] 10...Nut fall prevention device 20...Ring section 22...Continuous section 40...Annular section 42...Intersection 120...volts 122...Nut

Claims

[Claim 1] a ring portion having a wire rod that is bent into a ring shape to form a ring portion and an intersection point; A nut falling-off prevention tool including a pair of continuous portions provided so as to be continuous with both ends of the wire rod of the ring portion, the pair of continuous portions are deformed to approach each other when subjected to a force in a direction in which they approach each other, the pair of continuous portions protrude opposite to each other along a direction intersecting a plane along which the annular portion of the ring portion is aligned, a minimum value of the distance between the surfaces of the pair of continuous portions that correspond to the back surfaces when viewed from the opposing surfaces of the pair of continuous portions is greater than a minimum value of the span between the opposing locations of the annular portion in a direction perpendicular to the central axis of the annular portion, A nut fall-off prevention device characterized in that the minimum value of the spacing between the pairs of continuous portions is smaller than the minimum value of the distance in a direction perpendicular to the central axis of the annular portion between points on the outer periphery of the annular portion that are opposite each other when viewed from the center of the annular portion.

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