JP7728009B2 - Nut fall prevention device - Google Patents

Description

The present invention relates to a nut fall-off prevention device.

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 bolt's threads. 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 portion 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.

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 elastic wire. This nut fall-off prevention device includes a ring portion and a pair of operating portions formed on both ends of the wire for expanding the diameter of the ring portion. The ring portion is formed in the center of the wire. The ring portion grips the outer surface of the bolt. One end of the wire 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.

JP 2009-52648 A Japanese Patent Application Laid-Open No. 2019-203516

However, the nut fall-off prevention devices disclosed in Patent Documents 1 and 2 have a problem in that there is a high risk of multiple nut fall-off prevention devices accidentally connecting with each other. The present invention solves this problem. The object of the present invention is to reduce the risk of accidental connection.

The nut fall-off prevention device of the present invention will be explained based on the drawings. Note that the reference symbols used in this section are intended to facilitate understanding of the invention and are not intended to limit the scope of the invention to that shown in the drawings.

In order to solve the above-mentioned problems, according to one aspect of the present invention, the nut disengagement prevention device 10 comprises 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 the annular portion 40 and the intersection point 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 annular portion 40 of the ring portion 20 lies.

Furthermore, 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 across distance between opposing locations on the annular portion 40 in a direction perpendicular to the central axis L of the annular portion 40. Furthermore, 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 when viewed from the center of the annular portion 40 in a direction perpendicular to the central axis L of the annular portion 40.

When the minimum distance D between the surfaces of a pair of continuous portions 22, 22 that are the back surfaces when viewed from the opposing surfaces is greater than the minimum value φA described above, the possibility of a pair of continuous portions 22, 22 of a nut fall-off prevention device 10 entering the following section is reduced. This section is the annular portion 40 of the ring portion 20 of another nut fall-off prevention device 10 of the same size. This reduces the possibility of the pair of continuous portions 22, 22 of the former nut fall-off prevention device 10 being pressed against the annular portion 40 of the ring portion 20 of the latter nut fall-off prevention device 10, causing the former nut fall-off prevention device 10 to connect with the latter nut fall-off prevention device 10. This reduces the risk of multiple nut fall-off prevention devices 10, 10 accidentally connecting with each other.

This invention reduces the risk of accidental connections.

FIG. 1 is a plan view of a nut fall-off prevention device according to an embodiment of the present invention. FIG. 1 is a side view of a nut fall-off prevention device according to an embodiment of the present invention. FIG. 2 is a rear view of a nut fall-off prevention device according to an embodiment of the present invention. 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.

The present invention will now be described in detail with reference to the drawings. In the following description, identical parts will be designated by the same reference numerals. Their names and functions are also identical. Therefore, detailed descriptions thereof will not be repeated.

[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.

The nut fall-off prevention device 10 in this embodiment comprises a ring portion 20 and a pair of continuous portions 22, 22.

In this embodiment, the ring portion 20 and the pair of continuous portions 22, 22 are constructed from 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 by the minimum value φA of the span between opposing points on the annular portion 40 in a direction perpendicular to the central axis L of the annular portion 40.

The pair of continuous portions 22, 22 is made up of both ends of the wire material described above. More specifically, in this embodiment, the pair of continuous portions 22, 22 is made up of both ends of the wire material described above that are bent. As a result, the pair of continuous portions 22, 22 is provided so as to be continuous with each end of the portion that constitutes the ring portion 20. Note that in this embodiment, the minimum spacing C between the pair of continuous portions 22, 22 is smaller than the minimum distance φB between locations on the outer periphery of the annular portion 40 that are opposite each other when viewed from the center of the annular portion 40, in a direction perpendicular to the central axis L of the annular portion 40. On the other hand, the minimum spacing C between the pair of continuous portions 22, 22 is larger than the minimum distance φA 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 distance D between the surfaces of the pair of continuous portions 22, 22 that are the back surfaces when viewed from the opposing surfaces is greater than the minimum distance φA across the annular portion 40 between the opposing locations in the direction perpendicular to the central axis L of the annular portion 40.

The pair of continuous portions 22, 22 in this embodiment are aligned and face each other. Furthermore, as is particularly clear in Figures 2 and 3, the pair of continuous portions 22, 22 in this embodiment both rise from the ring portion 20. As a result, the pair of continuous portions 22, 22 in this embodiment each protrude in a direction that intersects with the plane along which the annular portion 40 of the ring portion 20 runs.

[Description of manufacturing method]
The nut disengagement 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 .

[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.

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 a 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. As a result, the pair of continuous portions 22, 22 are subjected to a force that moves 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 material 24 is deformed and bent.

When the pair of connecting members 24 bends, 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 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 position. As the annular portion 40 returns to its original position, it tightens the bolt 120. As the annular portion 40 tightens the bolt 120, the nut disengagement prevention device 10 according to this embodiment is fixed to the bolt 120. Figure 4 shows the nut disengagement prevention device 10 according to this embodiment fixed to the bolt 120. When the nut disengagement prevention device 10 according to this embodiment is fixed to the bolt 120, movement of the nut 122 is prevented when the nut 122 loosens, preventing the nut 122 from falling off.

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

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

For example, the continuous portion 22 may consist of a plate-shaped member attached to the end of the wire rod of the ring portion 20. The continuous portion 22 may also include other components in addition to the plate-shaped member. In other words, the configuration of the continuous portion 22 is not limited to that described above.

10... Nut fall prevention device 20... Ring portion 22... Continuous portion 40... Annular portion 42... Intersection portion 120... Bolt 122... Nut

Claims (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 .