Anti-detachment device and anti-detachment system

Abstract

To reduce manufacturing costs and prevent loosening of bolts and nuts. [Solution] A fall prevention device 100 made of a spirally wound wire prevents a bolt portion 200 having a cylindrical portion with a male thread formed on its outer circumference and a nut portion 400 having a female thread formed on its inner circumference and corners formed on its outer circumference that are screwed onto the male thread from falling off after being screwed together, comprising: a coil portion 20 that passes through the cylindrical portion; a receiving portion 10 located on one side of the coil portion 20 that receives the outer circumference; a locking portion 40 located on the other side of the coil portion 20 that locks onto the object to be locked; and a rotating portion 30 that applies a twisting motion to the receiving portion 20 in a direction that loosens the bolt portion 200 and the nut portion 400.

Description

Technical Field

[0001] The present invention relates to a detachment prevention tool and a detachment prevention system, and particularly to a detachment prevention tool and a detachment prevention system for preventing fasteners such as bolts and nuts from detaching.

Background Art

[0002] Patent Document 1 discloses a detachment prevention tool 1 having the following configuration. That is, based on FIG. 1 thereof, the detachment 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, and a fourth coil spring portion 6 in which a fourth coil wire 6A is formed in a substantially hexagonal shape.

[0003] Here, the detachment prevention tool 1 prevents the nut 22 fastened to the bolt 21 from detaching therefrom (paragraph 0001). However, as shown in FIG. 3 of Patent Document 1, the third coil spring portion 4 abuts against the upper surface of the nut 22 to prevent loosening (paragraph 0050).

[0004] It should be noted that in the detachment prevention tool 1 of Patent Document 1, it is described that the attachment of the detachment prevention tool 1 to the bolt 21 to which the nut 22 is fastened can be performed 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 detachment 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 [Overview of the project] [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 using the anti-loosening device 1, it deforms to some extent when attached to a bolt 21 with a nut 22 fastened to it, causing misalignment of a pair of 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 pair of corresponding tops 3B, 4B, etc., 6B fit into the same groove of the socket.

[0010] Therefore, the objective of this invention is to reduce manufacturing costs and prevent loosening of bolts and nuts. [Means for solving the problem]

[0011] In order to solve the above problems, the present inventors conducted diligent research and found that the problems of the invention described in Patent Document 1 can be solved by modifying the structure of the fall prevention device so as to change the role played by the part of the fall prevention device.

[0012] Specifically, the present invention is A first member having a cylindrical portion with a male thread formed on its outer circumference (for example, "bolt portion 200" in Figure 1) and a second member having a female thread formed on its inner circumference and a corner formed on its outer circumference (for example, "nut portion 400" in Figure 1) that is screwed onto the male thread, and a wire spirally wound to prevent the two from falling off after being screwed together, is provided with a fall prevention device (for example, "fall prevention device 100" in Figure 1), wherein the first member has a cylindrical portion with a male thread formed on its outer circumference (for example, "bolt portion 200" in Figure 1), and the second member has a female thread formed on its inner circumference and a corner formed on its outer circumference that is screwed onto the male thread, and a wire spirally wound to prevent the two from falling off after being screwed together, The coil portion (for example, "coil portion 20" in Figure 2) is passed through the cylindrical portion, A receiving portion located on one side of the coil portion and receiving the outer circumference (for example, "receiving portion 10" in Figure 2), A locking portion (for example, "locking portion 40" in Figure 2) is located on the other side of the coil portion and locks onto a locking object in the surrounding area (for example, "hanger 600" in Figure 1), A rotating part (for example, "rotating part 30" in Figure 2) that applies a torsional motion to the receiving part such that the first member and the second member loosen, It is equipped with.

[0013] The detachment prevention system of the present invention is The above-mentioned anti-detachment device, The first member and the second member to which the aforementioned fall prevention device is attached, It is equipped with. [Brief explanation of the drawing]

[0014] [Figure 1] This is a schematic diagram showing an example of the configuration of the fall prevention system according to Embodiment 1 of the present invention. [Figure 2A] Figure 1 is a front view of the fall prevention device 100. [Figure 2B] Figure 1 is a rear view of the fall prevention device 100. [Figure 2C] Figure 1 is a right side view of the fall prevention device 100. [Figure 2D] It is a left side view of the anti - detachment device 100 shown in FIG. 1. [Figure 2E] It is a plan view of the anti - detachment device 100 shown in FIG. 1. [Figure 2F] It is a bottom view of the anti - detachment device 100 shown in FIG. 1. [Figure 2G] It is a right - upper perspective view of the anti - detachment device 100 shown in FIG. 1. [Figure 2H] It is a left - upper perspective view of the anti - detachment device 100 shown in FIG. 1. [Figure 2I] It is a right - lower perspective view of the anti - detachment device 100 shown in FIG. 1. [Figure 2J] It is a left - lower perspective view of the anti - detachment device 100 shown in FIG. 1. [Figure 3] It is an explanatory view of dimensions and the like of each part of the anti - detachment device 100 shown in FIG. 1. [Figure 4] It is a schematic diagram showing a configuration example of the anti - detachment system according to Embodiment 2 of the present invention. [Figure 5A] It is a front view of the anti - detachment device 100 shown in FIG. 4. [Figure 5B] It is a rear view of the anti - detachment device 100 shown in FIG. 1. [Figure 5C] It is a right side view of the anti - detachment device 100 shown in FIG. 1. [Figure 5D] It is a left side view of the anti - detachment device 100 shown in FIG. 1. [Figure 5E] It is a plan view of the anti - detachment device 100 shown in FIG. 1. [[ID=四十二]] [Figure 5F] It is a bottom view of the anti - detachment device 100 shown in FIG. 1. [Figure 5G] It is a right - upper perspective view of the anti - detachment device 100 shown in FIG. 1. [Figure 5H] x It is a left - upper perspective view of the anti - detachment device 100 shown in FIG. 1. [Figure 5I] y It is a right - lower perspective view of the anti - detachment device 100 shown in FIG. 1. [Figure 5J] It is a left - lower perspective view of the anti - detachment device 100 shown in FIG. 1. [Figure 6] It is an explanatory view of dimensions and the like of each part of the anti - detachment device 100 shown in FIG. 4. [Explanation of Symbols]

[0015] 10 Receiving part 20 Coil section 30 Rotating parts 32 Part 1 34 Part 2 36 Part 3 40 Locking part 42 Proximal end 44 Tip 46 Nodes 48 Middle section 100 Fall prevention device 200 bolt section 300,400 Nut part 500 joist support 600 hangers 700 fastening part 800 Embodiment of the Metal Fitting Invention

[0016] Hereinafter, an embodiment of the fall prevention device of the present invention will be described with reference to the drawings.

[0017] (Embodiment 1) Figure 1 is a schematic diagram showing an example of the configuration of the fall prevention system according to Embodiment 1 of the present invention. Figure 1A shows a schematic front view of the fall prevention system. Figure 1B shows a side perspective view of Figure 1A. Embodiment 1 describes an example in which the fall prevention device 100 is used as a part for a suspended ceiling.

[0018] Figures 1A and 1B show the fall prevention device 100, the bolt portion 200, the nut portions 300 and 400, the joist support 500, and the hanger 600, which will be explained below.

[0019] The anti-loosening device 100 prevents the nuts 300 and 400 fastened to the bolt 200 from falling off. Specifically, the anti-loosening device 100 of Embodiment 1 prevents the nuts 300 and 400, which are screwed onto the bolt 200, from loosening and falling off the bolt 200. The detailed configuration of the anti-loosening device 100 will be described later with reference to Figure 2, but for example, it is made of stainless steel (such as SUS304), and if the size of the bolt 200 is W3 / 8, the pitch of the threads / roots of the male screw is 1.5 mm, so for example, it is manufactured by winding a coil wire of a predetermined length with a diameter of φ1.40±0.02 mm.

[0020] The bolt portion 200, along with the nut portions 300 and 400, is for connecting the joist hanger 500 to the suspension point via the hanger 600. The bolt portion 200 has a cylindrical portion with male threads formed on its outer circumference, with its upper end fixed to a suspension point (not shown) and its lower end open. The nut portion 300 is screwed onto the cylindrical portion of the bolt portion 200, then passed through a through hole (not shown) in the hanger 600, and then the nut portion 400 is screwed onto it. Subsequently, the fall prevention device 100 is attached to the bolt portion 200, the nut portion 400, and the hanger 600 in a manner described later.

[0021] The joist support 500 typically supports a joist (not shown). The joist support 500 is usually connected to the joist perpendicularly via a clip (not shown). The joist support 500 is not an essential part of the fall prevention system, and its length, width, height, material, etc., are not limited.

[0022] The hanger 600 is used to secure the joist support 500 to the bolt section 200. As described above, the hanger 600 is fixed to the bolt section 200 while positioned between the nut section 300 and the nut section 400. The hanger 600 is not an essential part of the fall prevention system, and its length, width, height, and material are not limited.

[0023] Figure 2 shows the external view of the fall prevention device 100 shown in Figure 1 from various angles. Figure 2A is a front view, Figure 2B is a rear view, Figure 2C is a right side view, Figure 2D is a left side view, Figure 2E is a top view, Figure 2F is a bottom view, Figure 2G is an upper right perspective view, Figure 2H is an upper left perspective view, Figure 2I is a lower right perspective view, and Figure 2J is a lower left perspective view.

[0024] The fall prevention device 100 can be broadly divided into a receiving portion 10, a coil portion 20, a rotating portion 30, and a locking portion 40, as shown in Figures 2A, 2C, and 2G, for example, as described below.

[0025] The receiving portion 10 has a hexagonal shape when viewed from the front, as shown in Figures 2A and 2G. The receiving portion 10 is the part that receives the hexagonal outer circumference of the nut portion 400, as shown in Figures 1A and 1B. The shape of the receiving portion 10 corresponds to the shape of the nut portion 400; if the nut portion 400 is, for example, an octagonal nut with an octagonal cylindrical portion, then the receiving portion 10 should be octagonal. The number of turns of wire to form the receiving portion 10 depends on the strength and diameter of the wire, but can be, for example, 2 to 5 turns.

[0026] The coil portion 20 is circular in shape when viewed from the front, as shown in Figures 2A and 2G. The coil portion 20 is the part that passes through the cylindrical portion of the bolt portion 200. The coil portion 20 only needs to be able to pass through the cylindrical portion of the bolt portion 200, so it can also be rectangular in shape, for example. The number of turns of wire to form the coil portion 20 depends on the strength and diameter of the wire, but can be, for example, 3 to 7 turns.

[0027] The rotating part 30 has a "roughly V-shape" in a front view, as shown in Figure 2A, for example, and a "roughly U-shape" in a plan view, as shown in Figure 2E. The rotating part 30 includes a first part 32 extending from the receiving part 10, a second part 34 extending perpendicular to the first part 32, and a third part 36 extending perpendicular to the second part 34 to the coil part 20, as shown in Figure 2E. The rotating part 30 is used to impart a twisting motion to the receiving part 10 in a direction that loosens the bolt part 200 and the nut part 400.

[0028] The locking portion 40 applies an elastic force to the receiving portion 10 in a direction that tightens the bolt portion 200 and the nut portion 400. The locking portion 40 includes, for example, a base portion 42 extending from the coil portion 20, and a tip portion 44 that is folded back from the base portion 42 and locks onto a surrounding object to be locked, such as the hanger 600 shown in Figure 1.

[0029] The fall prevention device 100 of Embodiment 1 is characterized in that, as shown in Figure 2H, for example, the receiving portion 10 is located on one side of the coil portion 20 (the left rear side in Figure 2H), and the locking portion 40 is located on the other side (the right front side in Figure 2H).

[0030] Figure 3 is an explanatory diagram of the dimensions of each part of the fall prevention device 100 shown in Figure 1. Figure 3A corresponds to Figure 2A, and Figure 3B corresponds to Figure 2C. Note that, to avoid redundancy, the reference numerals shown in Figure 2 are not shown in Figure 3.

[0031] As shown in Figures 3A and 2A, the receiving portion 10 can have a length of, for example, 8.2 mm for each of its six sides and a length of, for example, 17 mm between opposite sides. These dimensions assume that the size of the nut portion 40 is W3 / 8. Also, as shown in Figures 3B and 2C, the receiving portion 10 can have a height of, for example, 4.9 mm. This is the value when the wire is turned approximately 3.5 times.

[0032] As shown in Figures 3A and 2A, the inner diameter of the coil section 20 can be, for example, φ11.5 ± 0.1 mm. Furthermore, as can be derived from Figures 3B and 2C, the height of the coil section 20 can be, for example, 6.9 mm (= total height of the fall prevention device 100 14.5 mm - height of the rotating section 30 7.6 mm). This value is obtained when the wire is wound approximately four times.

[0033] As shown in Figures 3A and 2A, the length of the first portion 32 of the rotating part 30 can be, for example, 33 mm, the length of the third portion 36 can be, for example, 29.6 mm, and the angle between the third portion 36 and the base end portion 42 can be 133°. Also, as shown in Figures 3B and 2C, the height of the rotating part 30 can be, for example, 7.6 mm.

[0034] As shown in Figures 3A and 2A, the locking portion 40 can have a base end portion 42 with a length of, for example, 20.75 mm, a tip end portion 44 with a length of, for example, 3.7 mm, and a radius of R1.4 at the bent portion between the base end portion 42 and the tip end portion 44.

[0035] Furthermore, the height of the fall prevention device 100 can be set to, for example, 14.5 mm, as shown in Figures 3B and 2C.

[0036] Referring again to Figures 1A and 1B, the method of using the fall prevention device 100 of Embodiment 1 will be explained. First, as previously described, the hanger 600 is fixed to the bolt portion 200 by being sandwiched between the nut portion 300 and the nut portion 400.

[0037] Subsequently, the fall prevention device 100 is passed through the cylindrical portion of the bolt portion 200 from the receiving portion 10 side, and the receiving portion 10 is attached to the outer circumference of the hexagonal portion of the nut portion 400. As a result, the six sides of the receiving portion 10, consisting of sides 1, 2, ..., 6, and the faces of the hexagonal portion of the nut portion 400, consisting of faces 1, 2, ..., 6, face

[0038] Furthermore, since the inner circumference of the coil portion 20 is smaller than the outer circumference of the hexagonal portion of the nut portion 400, it does not reach the outer circumference of the hexagonal portion of the nut portion 400. For this reason, as will be described later, by rotating the rotating portion 30, an elastic force in the direction that tightens the bolt portion 200 and the nut portion 400 can be applied to the receiving portion 10.

[0039] Next, the tip 44 of the locking portion 40 of the fall prevention device 100 is locked to the hanger 600 as shown in Figure 1B. However, this locking may be done prior to attaching the receiving portion 10 to the nut portion 400.

[0040] Next, for example, using Figure 2H as an example, place your finger on the lower side of the second portion 34 of the rotating part 30 and start rotating it counterclockwise. This direction of rotation is the direction in which the nut part 400 loosens relative to the bolt part 200. Note that if the nut part 400 has just been firmly fixed to the bolt part 200, this rotation will not loosen the nut part 400 from the bolt part 200.

[0041] As the rotation of the rotating part 30 progresses, each side of the receiving part 10 is pushed apart by the corners between the faces of the bolt part 200. Specifically, each side of the receiving part 10 deforms in a manner that expands radially with respect to the axis of the receiving part 10 until the rotation angle reaches 30°. When the rotation angle of the receiving part 10 exceeds 30°, the opposing relationships between side 1 and face 1, side 2 and face 2, ..., side 6 and face 6 shift to opposing relationships between side 1 and face 2, side 2 and face 3, ..., side 6 and face 1.

[0042] In this way, the attachment of the fall prevention device 100, which spans the bolt portion 200, the nut portion 400, and the hanger 600, is completed. As a result, the angle between the third portion 36 and the tip portion 42 shown in Figure 3A widens from approximately 133° to 163°, causing the receiving portion 10 and the locking portion 40 to twist, and an elastic force is applied to the fall prevention device 100 that tries to return it to its original state.

[0043] Since this elastic force acts in the direction that tightens the nut portion 400 relative to the bolt portion 200, it is possible to prevent the nut portion 400 from loosening and detaching from the bolt portion 200.

[0044] (Embodiment 2) Figure 4 is a schematic diagram showing an example of the configuration of the fall prevention system of Embodiment 2 of the present invention. Figure 5 is an external view of the fall prevention device 100 shown in Figure 4 from various directions. Figure 6 is an explanatory diagram of the dimensions of each part of the fall prevention device 100 shown in Figure 4. Figures 4 to 6 correspond to Figures 1 to 3, respectively, and the same parts are denoted by the same reference numerals in each figure. Embodiment 2 describes an example in which the fall prevention device 100 is used as a part for a pipe fastening fitting.

[0045] Figure 4A shows a first perspective view of the fall prevention system. Figure 4B shows a second perspective view of the fall prevention system. Figures 4A and 4B show a fitting 800 attached to the outer circumference of a pipe (not shown), a pair of fastening parts 700 located opposite each other at the hinge portion of the fitting 800, a bolt portion 200 and a nut portion 400 that fix the fastening parts 700 to each other, and a fall prevention device 100 attached across the bolt portion 200 and nut portion 400 and the fastening parts 700.

[0046] Those skilled in the art will be able to understand, by comparing Figure 5 with Figure 2, that the fall prevention device 100 of Embodiment 2 and the fall prevention device 100 of Embodiment 1 differ in general terms in terms of the structure and shape of the locking portion 40.

[0047] Specifically, in the case of the fall prevention device 100 of Embodiment 1, the base end 42 and tip end 44 of the locking portion 40 form a J shape in a front view, as shown in Figure 2A, for example, and the base end 42 and tip end 44 of the locking portion 40 form an I shape in a side view, as shown in Figure 2C, for example.

[0048] In contrast, in the case of the fall prevention device 100 of Embodiment 2, the locking portion 40 has a joint portion 46 and an intermediate portion 48, and the intermediate portion 48 and tip portion 44 of the locking portion 40 form an I shape in a front view, as shown in Figure 5A, for example, and the intermediate portion 48 and tip portion 44 of the locking portion 40 form a J shape, and the intermediate portion 48 is long enough to extend to a position where the tip portion 44 exceeds the receiving portion 10.

[0049] Thus, the fall prevention device 100 of Embodiment 2 adopts a shape that takes into account the position of the fastening portion 700, which is the object to be locked, while realizing a structure with the receiving portion 10, coil portion 20, and locking portion 40 in that order.

[0050] In other words, the fall prevention device 100 of Embodiment 1 and the fall prevention device 100 of Embodiment 2 have the same arrangement of the receiving part 10, coil part 20, and locking part 40, but the structure and shape of the locking part 40 differ depending on the positional relationship between the fall prevention device 100 and the object to be locked.

[0051] Next, the dimensions of the fall prevention device 100 of Embodiment 2, as illustrated in Figures 6A and 6B, will be explained in comparison with the dimensions of the fall prevention device 100 of Embodiment 1, as illustrated in Figures 3A and 3B. In Embodiment 1, the dimensions were illustrated assuming that the size of the bolt portion 200 and the nut portion 400 is W3 / 8, but in Embodiment 2, the dimensions are illustrated assuming that they are M10.

[0052] As shown in Figures 6A and 5A, the receiving portion 10, like in Embodiment 1, can have the length of each of its six sides set to, for example, 8.2 mm, and the length between opposite sides set to, for example, 17 mm. Furthermore, as shown in Figures 6B and 5C, the receiving portion 10 can have a height of, for example, 3.3 mm. This value is for approximately three turns of wire.

[0053] As shown in Figures 6A and 5A, the coil section 20 can have an inner diameter of, for example, φ11.0 mm. Furthermore, as shown in Figures 6B and 5C, the coil section 20 can have a height of, for example, 5 mm. This value is obtained when the wire is wound approximately four times.

[0054] As shown in Figures 6A and 5A, the length of the first part 32 of the rotating part 30 can be, for example, 27.5 mm, the length of the third part 36 can be, for example, 26 mm, and the angle between the third part 36 and the tip part 42 can be 165°. Also, as shown in Figures 6B and 5C, the height of the rotating part 30 can be, for example, 9 mm.

[0055] As shown in Figures 6A and 5A, the locking portion 40 can have a total length of the base portion 42 and the intermediate portion 48 in plan view of, for example, 27.5 mm. As shown in Figures 6B and 5C, the length of the base portion 42 can be 13.4 mm, the length of the intermediate portion 48 can be 17 mm, the length of the tip portion 44 can be, for example, 3 mm, the angle between the base portion 42 and the intermediate portion 48 can be 44°, and the angle between the intermediate portion 48 and the tip portion 44 can be 60°.

[0056] Furthermore, as shown in Figures 6B and 5C, the height of the fall prevention device 100 can be, for example, 12.6 mm (= height of the rotating part 30 9 mm + height of the coil part 20 5 mm - wire diameter 1.4 mm).

[0057] The anti-detachment device and anti-detachment system of the present invention have been described above with reference to Embodiments 1 and 2, but the anti-detachment device of the present invention is not limited to these uses. That is, the anti-detachment device can be applied to a variety of uses by changing the length and shape of the locking part according to the object to be locked, and by changing the diameter and number of turns of the receiving part and coil part according to the size of the bolt part and nut part.

[0058] For example, the fastener is not limited to a combination of a bolt and a nut; the bolt may be fastened to a hole with internal threads rather than a nut. In such cases, for example, the head of a so-called hexagonal bolt may be supported by the receiving part 10 to prevent the bolt from falling out of the hole.

Claims

1. A fall prevention device comprising a first member having a cylindrical portion with a male screw formed on its outer circumference, and a second member having a female screw formed on its inner circumference and a corner formed on its outer circumference, which is screwed into the male screw, is provided to prevent the two members from falling apart after being screwed together, the device comprising a wire wound in a spiral shape, The coil portion is passed through the cylindrical portion, A receiving portion located on one side of the coil portion and receiving the outer circumference, A locking portion located on the other side of the coil portion and which engages with a locking object in the surrounding area, A rotating part that applies a torsional motion to the receiving part such that the first member and the second member loosen, It is equipped with.

2. The aforementioned rotating part is roughly V-shaped when viewed from the front and roughly U-shaped when viewed from above. The fall prevention device according to claim 1.

3. The fall prevention device according to claim 1, The first member and the second member to which the aforementioned fall prevention device is attached, Equipped with, Anti-dropping system.

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