anti-drop member

Abstract

A fall-preventing member (1) is a fall-preventing member (1) for a nut (N) provided on a bolt (B) to which the nut (N) is attached, and has a bolt holding portion (2b) into which the bolt (B) is inserted, and a nut holding portion (3) provided integrally with the bolt holding portion (2b) and provided on the outer periphery of the nut (N) to prevent rotation of the nut (N) by a restoring force.

Description

[0001] This application is a divisional application of the patent application with application number 202080012170.5, filed on February 6, 2020, and with the title “Anti-falling piece”. TECHNICAL FIELD

[0002] The present application relates to an anti-falling piece.

[0003] This application claims priority from patent application No. 2019-020673 filed in Japan on February 7, 2019, the contents of which are hereby incorporated by reference. BACKGROUND

[0004] In order to prevent a nut mounted on a bolt from falling off, an anti-falling piece is sometimes installed on the bolt. For example, Patent Document 1 discloses an anti-falling piece that has a first coil spring portion in a ring shape, a second coil spring portion disposed on the first coil spring portion and wound around the bolt, and a connecting portion connecting the first coil spring portion and the second coil spring portion. The anti-falling piece can be installed on the bolt in the same manner as the nut. Thus, the anti-falling piece prevents the nut from moving in the axial direction of the bolt by being wound around the bolt.

[0005] Patent Document 1: Japanese Patent No. 5200190

[0006] The anti-falling piece described above needs to be fixed to the bolt with a strong force because it prevents the nut from loosening by being wound around the bolt. Therefore, when the nut is detached from the bolt, for example, at the time of maintenance or disassembly, it is difficult to detach the anti-falling piece from the bolt because the anti-falling piece bites the nut or the like. Therefore, when the conventional anti-falling piece is detached, it is detached by breaking the anti-falling piece with a tool or the like. SUMMARY

[0007] The present application is made in view of the above-described circumstances, and aims to easily detach an anti-falling piece.

[0008] A first aspect of the present application is an anti-falling piece that is an anti-falling piece for a nut provided on a bolt on which the nut is mounted, the anti-falling piece having a bolt holding portion into which the bolt is inserted, and a nut holding portion that is provided integrally with the bolt holding portion and that is provided on the outer periphery of the nut and that prevents rotation of the nut by a restoring force.

[0009] In the first aspect described above, a second aspect of the present application has a handle portion connected to the bolt holding portion and capable of changing the diameter of the bolt holding portion.

[0010] In the second aspect described above, a third aspect of the present application has the handle portion protruding outward more than the nut holding portion in the radial direction of the bolt.

[0011] According to a fourth aspect of the present application, in any one of the above first to third aspects, the bolt holding portion and the nut holding portion are formed by one wire.

[0012] According to a fifth aspect of the present application, in any one of the above first to fourth aspects, the nut holding portion is in contact with the outer circumferential surface of the nut and is polygonal in shape.

[0013] According to the anti-falling member of the above aspect of the present application, the nut is held by the nut holding portion, and thus rotation of the nut is prevented by the restoring force. Therefore, the anti-falling member of the above aspect of the present application can be detached from the bolt without damage and is easy to detach from the bolt. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 is a front view of the anti-falling member of an embodiment of the present application when a bolt is not installed.

[0015] Figure 2 is a front view of the anti-falling member of an embodiment of the present application when a bolt is installed.

[0016] Figure 3 is a perspective view of the anti-falling member of an embodiment of the present application.

[0017] Figure 4 is a side view of the anti-falling member of an embodiment of the present application when a bolt is installed. DETAILED DESCRIPTION

[0018] Hereinafter, an embodiment of the anti-falling member of the present application will be described with reference to the drawings.

[0019] The anti-falling member 1 of the present embodiment is formed by bending one wire 6, as shown in Figures 1-3 has a movable portion 2 and a nut holding portion 3.

[0020] The movable portion 2 has a handle portion 2a, a bolt holding portion 2b, and a winding portion 2c. The handle portion 2a is a portion in which two protrusions 4 curved in a V shape are arranged so as to cross each other. In addition, the two protrusions 4 of the handle portion 2a are continuous with the bolt holding portion 2b and the winding portion 2c. Thus, the handle portion 2a can change the inner diameter of the bolt holding portion 2b by changing the width (distance from the direction at right angles to the bolt axial direction) between the later-described bent portions 5 provided continuously in the bolt holding portion 2b. Further, the handle portion 2a protrudes more outward in the radial direction than the nut holding portion 3 when viewed from the bolt axial direction. Here, the bolt axial direction refers to the direction in which the bolt B shown in Figure 4 extends.

[0021] The bolt retaining portion 2b is continuously formed at the end of the handle portion 2a, and has two curved portions 5 that are semi-circularly bent. The two curved portions 5 are connected to each of the two protrusions 4, and overlap each other in the bolt axial direction by changing the crossing angle of the protrusions 4, thereby making the two curved portions 5 annular when viewed from the bolt axial direction. Furthermore, the bolt B is inserted into the central cavity of the bolt retaining portion 2b, and is held in a state of engagement with the thread groove G. That is, the bolt retaining portion 2b holds the bolt B by clamping it between the two curved portions 5.

[0022] The winding portion 2c is a helical spring-shaped part formed by repeatedly winding the metal wire 6 coaxially. This winding portion 2c is formed adjacent to (continuously with) the bolt holding portion 2b on the side opposite to the handle portion 2a, and both ends of the winding portion 2c are connected to two curved portions 5. Furthermore, when force is applied to the end of the handle portion 2a, the winding portion 2c can elastically deform in the diameter reduction direction, thereby changing the position of the handle portion 2a.

[0023] The nut retaining part 3 is continuously formed with one end of the handle part 2a, bent into a hexagonal shape (polygonal shape), and as shown... Figure 3 The part shown is wound multiple times. This nut retaining part 3 is coaxially arranged with the bolt retaining part 2b (bent part 5), which is annular when viewed from the bolt axial direction when force is applied to the handle part 2a. As shown... Figure 2 As shown, when the anti-loosening component 1 is installed on the bolt B, the nut retaining part 3 is disposed on the outer periphery of the nut N. At this time, the inner side of the nut retaining part 3 is fixed in a state of contact with each surface of the outer periphery of the hexagonal nut N. That is, the nut retaining part 3 is fixed in a state of contact with the outer peripheral surface of the nut N.

[0024] The bolt retaining part 2b of the anti-loosening component 1 is in Figure 1 In this state, in the direction that reduces the intersection angle of the protrusions 4, the operator applies force to the handle portion 2a from both sides, causing the bent portion 5 of the bolt retaining portion 2b to overlap in the bolt axial direction. Therefore, the bent portion 5 of the bolt retaining portion 2b appears annular when viewed from the bolt axial direction. In this state, as... Figure 1 and Figure 4 As shown, the operator inserts the anti-loosening component 1 into the bolt B from the side where the nut retaining portion 3 is formed. Then, by releasing the handle portion 2a, the operator generates a force (restoring force) to return to its original direction. Therefore, the bolt B is in a state where the bent portion 5 of the bolt retaining portion 2b applies force from both sides towards the direction in which the bolt B is clamped. Here, when making... Figure 1 In the direction where the intersection angle of the protrusions 4 of the anti-slip member 1 decreases, if the operator applies force to the handle 2a from both sides, the intersection angle of the protrusions 4 decreases, thereby making the anti-slip member 1... Figure 2The state shown.

[0025] When such an anti-loosening component 1 is installed on bolt B, as Figure 2 As shown, viewed from the bolt axial direction, the bolt retaining part 2b and the nut retaining part 3 are arranged coaxially. At this time, the nut retaining part 3 is fixed while applying force to the nut N in the direction of tightening (rotation direction).

[0026] In this state, if the nut retaining part 3 is subjected to a load in the direction of loosening of the nut N (the direction of rotation opposite to the tightening direction) due to vibration or other reasons, it will flex in the expansion direction (relaxation direction). At this time, a flexural restoring force is generated in the nut retaining part 3, and the nut retaining part 3 returns to its original position, that is, to the position when the anti-detachment member 1 is installed on the nut N. Thus, the nut N is in a state where rotation is prevented by the nut retaining part 3. Therefore, the anti-detachment member 1 according to this embodiment can prevent the nut N from falling off by preventing the rotation of the nut N by the nut retaining part 3.

[0027] According to the anti-loosening component 1 of this embodiment, the rotation of the nut N is prevented by the applied force (the flexural restoring force of the nut retaining part 3), thereby eliminating the need to securely install the anti-loosening component 1 on the bolt B and preventing the application of large forces to the bolt B. Therefore, for example, during maintenance or disassembly, the anti-loosening component 1 can be easily removed when removing the nut N from the bolt B. The anti-loosening component 1 is not damaged during disassembly and can therefore be reused.

[0028] Furthermore, according to the anti-loosening component 1 of this embodiment, the inner diameter of the bolt retaining portion 2b can be changed using the handle portion 2a. Therefore, when the anti-loosening component 1 is installed on the bolt B, it is not necessary to rotate the anti-loosening component 1 along the thread groove G from the bolt axial direction to move it to the position where the nut N is provided. That is, the anti-loosening component 1 can be directly installed at the position where the nut N is provided by flexing the bolt retaining portion 2b so that its inner diameter is larger than the bolt's outer diameter. Therefore, the installation of the anti-loosening component 1 is easy.

[0029] Furthermore, according to the anti-loosening member 1 of this embodiment, the nut retaining portion 3 is a hexagonal shape with the same external shape as the nut N. Therefore, when the nut retaining portion 3 is installed on the nut N, it will not deviate from the nut N, and can reliably hold the nut N. Thus, the anti-loosening member 1 can reliably prevent the nut N from falling off.

[0030] Furthermore, according to the anti-detachment component 1 of this embodiment, the movable part 2 and the nut retaining part 3 are formed by processing a metal wire 6. Therefore, it is easy to form and easy to transmit force to each part.

[0031] Furthermore, according to this embodiment, the handle portion 2a protrudes further radially outward than the nut retaining portion 3. This allows the operator to easily grip the handle portion 2a, and facilitates the installation of the anti-slip component 1.

[0032] Preferred embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments. The various shapes, combinations, etc. of the constituent components shown in the above embodiments are examples, and various modifications can be made according to design requirements, etc., without departing from the scope of the present invention as defined by the claims.

[0033] In the above embodiment, the nut retaining part 3 is hexagonal in shape, but the present invention is not limited thereto. The nut retaining part 3 can be configured in various shapes (polygonal shapes) to match the outer shape of the nut N. In addition, for example, if the nut retaining part 3 is quadrilateral, the nut N can be retained in the same way as when the nut retaining part 3 is hexagonal, even in the case of a hexagonal nut N.

[0034] Furthermore, in the above embodiment, the anti-loosening member 1 is formed with a handle portion 2a, but the present invention is not limited thereto. For example, even without the handle portion 2a and when the inner diameter of the bolt retaining portion 2b cannot be changed, the anti-loosening member 1 can be moved to the position where the nut N is provided by rotating along the thread groove G of the bolt B, thereby installing the anti-loosening member 1 onto the nut N.

[0035] Furthermore, in the above embodiment, the handle portion 2a of the anti-loosening member 1 protrudes radially outward more than the nut retaining portion 3, but the present invention is not limited thereto. The handle portion 2a may also be formed radially inward more than the nut retaining portion 3. In this case, the anti-loosening member 1 will not protrude significantly radially outward from the nut N, and will not obstruct the surrounding structure of the nut N and bolt B.

[0036] According to the embodiments of the present invention, the anti-loosening component can be removed from the bolt without damaging the anti-loosening component, and the removal of the anti-loosening component from the bolt is easy.

[0037] Explanation of reference numerals in the attached figures

[0038] 1 Anti-fall-off component

[0039] 2 movable parts

[0040] 2a Handle

[0041] 2b Bolt Retaining Part

[0042] 2c winding section

[0043] 3 Nut Retention Section

Claims

1. An anti-loosening member, which is an anti-loosening member for a nut provided on a bolt to which the nut is attached, the anti-loosening member having: a bolt holding portion into which the bolt is inserted; and a nut holding portion provided integrally with the bolt holding portion and provided on an outer periphery of the nut and blocking rotation of the nut by a restoring force, the anti-loosening member further including a coil portion in a spiral spring shape, a force in a direction in which the bolt is clamped by the bolt holding portion being generated by the coil portion, the bolt holding portion having two curved portions that clamp and hold the bolt, both ends of the coil portion being connected to the two curved portions, respectively, a force in a direction in which the bolt is clamped by the two curved portions being generated by the coil portion.

2. The anti-loosening member according to claim 1, having a handle portion connected to the bolt holding portion and capable of changing a diameter of the bolt holding portion. the handle portion protruding outward more than the nut holding portion in a radial direction of the bolt. the bolt holding portion, the coil portion, and the nut holding portion are formed of one metal wire. the nut holding portion is in contact with an outer peripheral surface of the nut and is provided in a polygonal shape. the nut holding portion is in contact with an outer peripheral surface of the nut and is provided in a polygonal shape. ​ 3. The anti-dropout according to claim 2, wherein, ​ 4. The anti-dropout member according to any one of claims 1 to 3, wherein ​ 5. The anti-dropout member according to any one of claims 1 to 3, wherein ​ 6. The anti-dropout according to claim 4, wherein, ​

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