Turnbuckle loosening prevention device

Abstract

To provide a novel loosening prevention tool for a turnbuckle.SOLUTION: A loosening prevention tool for a turnbuckle for preventing a screw rod of a turnbuckle from loosening includes: a coil spring part made of a coil wire that is wound around in a predetermined direction, and fitted to a trough part of the screw rod; and a tightening part extending outward from an end on a tip side of the screw rod of the coil spring part and capable of interfering a turnbuckle frame body. When the screw rod rotates so as to retreat, the tightening part interferes with the turnbuckle frame body and the coil spring part tightens the screw rod.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a turnbuckle loosening prevention device that prevents a turnbuckle from loosening. [Background technology]

[0002] Metal fittings called "turnbuckles" are used to adjust the tension of wires, ropes, etc. A turnbuckle has a frame body with a left-handed threaded hole at one end in the longitudinal direction and a right-handed threaded hole at the other end, and a left-handed threaded rod and a right-handed threaded rod that screw into the left and right threaded holes, respectively. The turnbuckle is used with each threaded rod screwed into the left and right threaded holes of the frame body, and by rotating the frame body in one direction, both the left-handed threaded rod and the right-handed threaded rod are tightened or loosened, thereby adjusting the tension. Turnbuckles are widely used to suspend and secure components, but they can gradually rotate due to vibrations, etc., causing the wire to loosen. If the turnbuckle rotates and the wire loosens, it could lead to serious accidents, such as components falling, so the turnbuckle must be periodically retightened, which requires a large maintenance burden.

[0003] In order to prevent the turnbuckle from loosening, Patent Documents 1 and 2 propose metal fittings that are fixed to the end of the threaded rod screwed into the turnbuckle. These metal fittings are shaped so that they cannot rotate within the frame of the turnbuckle, and by firmly fixing these metal fittings so that they do not rotate relative to the threaded rod, the rotation of the threaded rod and the turnbuckle frame is prevented. These metal fittings can prevent the turnbuckle from loosening, but since these metal fittings are firmly fixed to the threaded rod, they cannot be easily removed when you want to loosen the turnbuckle. In addition, these metal fittings are heavy because they require strength, and carrying a large number of them to install them in multiple places places a heavy burden on workers. Furthermore, since the metal fittings themselves have a complex shape, it takes a huge amount of effort and cost to install them on all turnbuckles at sites where hundreds of thousands of turnbuckles are used, such as highways and elevated railways. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 63-107636 [Patent Document 2] JP 2010-101435 A Summary of the Invention [Problem to be solved by the invention]

[0005] To provide a new turnbuckle loosening prevention device. [Means for solving the problem]

[0006] The means for solving the problems of the present invention are as follows. 1. A turnbuckle loosening prevention device that prevents the threaded rod of a turnbuckle from loosening, A coil spring portion that is composed of a coil wire wound in a predetermined direction and that fits into a valley portion of the threaded rod; A tightening portion that extends outward from the end portion of the coil spring portion on the threaded rod tip side and can interfere with the turnbuckle frame; having When the threaded rod is rotated so as to retreat, the tightening portion interferes with the turnbuckle frame body, and the coil spring portion tightens the threaded rod. 2. The coil spring has a loosening portion extending outward from the end of the coil spring on the rear end side of the threaded rod, The coil spring portion has a large diameter portion in which at least 1 / 4 of a turn from the end portion on the rear end side of the threaded rod does not come into contact with the threaded rod into which it is fitted, The turnbuckle loosening prevention device described in 1. is characterized in that when the threaded rod rotates forward and both the tightening portion and the loosening portion interfere with the turnbuckle frame, the end portion of the coil spring portion on the rear end side of the threaded rod does not come into contact with the threaded rod. 3. A turnbuckle loosening prevention device as described in 1. or 2., characterized in that the coil spring portion is wound with 1 to 7 turns. Effect of the Invention

[0007] In the turnbuckle loosening prevention device of the present invention (hereinafter also referred to as the loosening prevention device), when the threaded rod rotates backward, the tightening portion interferes with the turnbuckle frame body, and a force is applied in the direction in which the coil spring portion tightens. Then, as the coil spring portion tightens the threaded rod, the friction between the coil spring portion and the threaded rod increases, and it is possible to prevent the turnbuckle from rotating in the loosening direction. Since the turnbuckle loosening prevention device of the present invention is formed from coil wire, it is lightweight and less expensive than conventional devices. The loosening prevention device of the present invention can prevent the turnbuckle from rotating in the loosening direction, but does not prevent the turnbuckle from rotating in the tightening direction, so it does not interfere with inspection work. The anti-loosening device of the present invention having a loosening portion loses its anti-loosening effect when the threaded rod is rotated while applying force to the loosening portion in a direction that moves the coil spring portion away from the threaded rod, so that the turnbuckle can be easily loosened and the anti-loosening device can be easily removed. [Brief description of the drawings]

[0008] [Figure 1] (a) is a perspective view of the tightening side of the anti-loosening device, and (b) is a perspective view of the loosening side. [Diagram 2] FIG. 13 is a diagram showing the state in which a loosening prevention device is fitted onto the threaded rod of a turnbuckle. [Diagram 3] Enlarged views from two directions of the anti-loosening device fitted onto a right-handed threaded rod. [Figure 4] FIG. 2 is an enlarged view of the right-hand threaded rod portion with a loosening prevention device fitted onto the threaded rod of the turnbuckle. [Diagram 5] 13 is a diagram explaining how a loosening prevention device fitted onto a threaded rod prevents the threaded rod from rotating in the backward direction. [Figure 6] 13 is a diagram explaining how a loosening prevention device fitted onto a threaded rod prevents the threaded rod from rotating in the backward direction. [Figure 7] A diagram explaining that the anti-loosening device fitted to the threaded rod does not prevent the threaded rod from rotating in the forward direction. [Figure 8] A diagram explaining that the anti-loosening device fitted to the threaded rod does not prevent the threaded rod from rotating in the forward direction. [Figure 9] A diagram explaining that the anti-loosening device fitted to the threaded rod does not prevent the threaded rod from rotating in the forward direction. [Figure 10] FIG. 13 is a diagram illustrating that the threaded rod can be rotated in the backward direction even when a loosening prevention device is fitted onto the threaded rod. [Figure 11] FIG. 13 is a diagram illustrating that the threaded rod can be rotated in the backward direction even when a loosening prevention device is fitted onto the threaded rod. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] In this specification, the end of the threaded rod screwed into the turnbuckle frame that is located inside the turnbuckle is referred to as the front end, and the other end is referred to as the rear end, and the movement of the threaded rod into the turnbuckle frame is referred to as the forward movement, and the movement of the threaded rod so as to come off the turnbuckle frame is referred to as the backward movement.

[0010] The loosening prevention device of the present invention will be described with reference to the drawings. FIG. 1 shows perspective views from two directions of a loosening prevention device 100 according to one embodiment of the present invention. One embodiment of the loosening prevention device 100 is for right-handed threads, and the left-handed version has the opposite winding direction to the right-handed version of the loosening prevention device 100. The left-handed version can be made symmetrical to the right-handed version, and in order to easily distinguish it from the right-handed version, it can be colored a different color, be made of a coil wire with a different cross-sectional shape, or have a different shape for either or both of the tightening portion and the loosening portion, etc.

[0011] One embodiment of the anti-loosening device 100 is composed of a coil wire wound in a predetermined direction, and has a coil spring portion 1 that fits into the valley portion of a right-handed threaded rod (hereinafter also referred to as simply the threaded rod), a tightening portion 2 that extends outward from an end 12 (hereinafter also referred to as the tightening portion side end) of the coil spring portion 1 on the tip side of the threaded rod and is capable of interfering with a turnbuckle frame, and a loosening portion 3 that extends outward from an end 13 (hereinafter also referred to as the loosening portion side end) on the rear end side of the threaded rod and is capable of interfering with the turnbuckle frame. The loosening prevention device 100 is fitted into the right-handed threaded rod from the end 13 (loosening part side end) on the rear end side of the threaded rod and fits into the valley part of the right-handed threaded rod. The coil spring part 1 has a large diameter part 11 that does not come into contact with the fitted threaded rod, about 1 / 2 turn from the end 13 on the rear end side of the threaded rod.

[0012] The cross-sectional shape of the coil wire is not limited, and for example, a steel wire having a substantially circular or substantially rectangular shape can be used, but it is preferable to use a steel wire or round steel having a substantially circular cross-sectional shape because the coil wire fits easily into the thread groove and is less prone to wear. The cross-sectional shape of the coil wire is not limited to a perfect circle, and may be elliptical or egg-shaped. The outer diameter of the coil wire may be any size that allows it to fit into the thread groove of the threaded rod.

[0013] The coil spring portion 1 is formed so that the inner diameter of the portion excluding the large diameter portion 11 is smaller than the outer diameter of the threaded rod and larger than the diameter of the circle formed by the bottom of the thread groove. The coil spring portion 1 is formed with about 2 turns, and about 1 / 2 turns from the loosening portion side end portion 13 are the large diameter portion 11, so that about 3 / 2 turns of the coil spring portion 1 come into contact with the threaded rod. The longer the contact length between the coil spring portion 1 and the threaded rod, the larger the contact area becomes and the larger the frictional force becomes, improving the effect of preventing loosening. However, if the number of turns is too large, the coil spring portion 1 becomes bulky and difficult to attach and detach from the threaded rod. Therefore, it is preferable that the coil spring portion 1 has 1 to 7 turns.

[0014] Large diameter portion 11 is a portion that does not come into contact with the threaded rod when the threaded rod is fitted into coil spring portion 1, and is formed approximately 1 / 2 turn from loosening portion side end 13. Large diameter portion 11 needs to be formed at least 1 / 4 turn from loosening portion side end 13, and preferably 3 / 4 turn or less. The loosening prevention device 100 is fitted into the threaded rod from the loosening portion side end 13 of the coil spring portion 1, and the loosening portion side end 13 of the coil spring portion 11 is the large diameter portion 11. Since the portion of the loosening prevention device 100 into which the threaded rod is first fitted has a large diameter, that is, the large diameter portion 11, the device is easy to fit into the threaded rod initially without requiring a large force, and is therefore easy to install. Furthermore, since the loosening prevention device 100 includes the large diameter portion 11, the device can be easily fitted into the thread groove at the tip of the threaded rod, and therefore the device can be fitted even if there is some error in the machining dimensions of the threaded rod.

[0015] The shape of the tightening part 2 is not particularly limited, but as shown in one embodiment example, it is preferable that the tightening part 2 includes, in order from the end 12 (tightening part side end 12) on the tip side of the threaded rod, an extension part 21 extending outward, a folded part 22 folded back in the opposite direction to the winding direction of the coil spring part 1, and a contact part 23 that interferes with the frame of the turnbuckle when the threaded rod rotates to move backward. The tightening part 2 with this shape has spring elasticity because the contact part 23 can deform with the folded part 22 as the starting point. Then, when the contact part 23 interferes (contacts) with the turnbuckle frame, the vibration and impact transmitted from the turnbuckle frame to the contact part 23 can be absorbed and attenuated by this spring elasticity, so that metal fatigue is unlikely to occur, and in particular, breakage at the tightening part side end 12, which is the connection point between the coil spring part 1 and the tightening part 2, can be prevented.

[0016] The shape of the loosening portion 3 is not particularly limited, but for the same reason as the tightening portion 2 in one embodiment, it is preferable that it has, in order from the end 13 on the rear end side of the threaded rod (loosening portion side end 13), an extension portion 31 extending outward, a folded portion 32 folded back in the direction opposite to the winding direction of the coil spring portion 1, and a contact portion 33 that interferes with the frame of the turnbuckle when the threaded rod is rotated forward. The loosening portion 3 is connected to the large diameter portion 11 that does not come into contact with the threaded rod 300, and is therefore capable of moving in the circumferential direction of the threaded rod. The loosening portion 3 is formed in a position where it interferes (comes into contact) with the frame of the turnbuckle before the tightening portion 2 when the threaded rod rotates so as to move forward, and is formed so that the loosening portion side end portion 13 does not come into contact with the threaded rod when the threaded rod rotates so as to move forward and both the tightening portion 3 and the loosening portion 2 that have moved in the circumferential direction interfere with the turnbuckle frame.

[0017] The function of the loosening prevention device of the present invention will be described below with reference to the drawings. Note that, although the description will be given using a right-handed threaded rod as an example, the device functions similarly on a left-handed threaded rod. A (right) threaded rod 300 and a (left) threaded rod 310 are screwed into the turnbuckle frame body 200, and anti-loosening devices 100, 110 are fitted into the tip portions of the respective threaded rods (FIGS. 2 to 4). The diameter of the coil spring portion 1 expands when it is fitted onto the threaded rod 300, and therefore the positional relationship between the loosening portion 3 and the tightening portion 2 changes (FIG. 3) compared to before attachment to the threaded rod (FIG. 1). It is preferable that the loosening prevention device 100 is fitted so that two or more revolutions of the thread are exposed from the tightening portion side end 12 of the loosening prevention device 100 so that the loosening prevention device 100 will not come off even if the threaded rod 300 rotates backward relative to the loosening prevention device 100.

[0018] In FIG. 4, when the threaded rod 300 is rotated in the direction indicated by the symbol A, it retreats relative to the turnbuckle frame body 200, and when it is rotated in the direction indicated by the symbol B, it advances relative to the turnbuckle frame body 200. When the threaded rod 300 rotates in the backward direction (direction A), the contact portion 23 of the tightening portion 2 comes into contact with the turnbuckle frame body 200 (Figs. 5 and 6). In this state, when the threaded rod 300 tries to rotate further in the backward direction (direction A), stress is generated in the contact portion 23 (tightening portion 2) in the opposite direction (direction B) to the direction of rotation of the threaded rod. This stress is transmitted to the tightening portion side end portion 12 and acts to reduce the diameter of the coil spring portion 1, i.e., to tighten the threaded rod 300 (Fig. 6). Furthermore, as the coil spring portion 1 tightens the threaded rod 300, the friction between the loosening prevention device 100 and the threaded rod 300 increases, so that the loosening prevention device 100 can prevent the threaded rod 300 from rotating in the backward direction (direction A). As the force attempting to rotate the threaded rod 300 in the backward direction increases, the tightening portion side end portion 12 tightens the threaded rod more tightly, increasing the friction between the loosening prevention device 100 and the threaded rod 300, so that the loosening prevention device 100 can effectively prevent the threaded rod 300 from rotating in the backward direction and loosening the turnbuckle.

[0019] In the loosening prevention device 100, the contact portion 23 can deform starting from the folded-back portion 22, so the fastening portion 2 has spring elasticity. When the contact portion 23 of the loosening prevention device 100 is in interference (contact) with the turnbuckle 200, vibrations and impacts are transmitted from the turnbuckle frame body 200 to the fastening portion 2, but these are absorbed and attenuated by the spring elasticity of the fastening portion 2. Therefore, the loosening prevention device 100 is less susceptible to metal fatigue, and in particular, breakage at the fastening portion side end portion 12 can be prevented.

[0020] Conversely, when the threaded rod 300 rotates in the forward direction (direction B), first, the contact portion 33 of the loosening portion 3 comes into contact with the turnbuckle frame body 200 (FIGS. 7 and 9(a)). The loosening portion 3 is connected to the large diameter portion 11 that does not come into contact with the threaded rod 300, and therefore can move in the circumferential direction of the threaded rod. Therefore, when the threaded rod 300 rotates further in the forward direction (direction B), the loosening portion 3 moves in the circumferential direction, and the extension portion 21 of the tightening portion 2 as well as the loosening portion 3 come into contact with the turnbuckle frame body 200 (FIGS. 8 and 9(b)). Even in this state, the loosening portion side end portion 13 and the large diameter portion 11 do not come into contact with the threaded rod 300.

[0021] In this state, when threaded rod 300 is further rotated in the forward direction (direction B), stress is generated in loosening portion 3 and tightening portion 2 in the opposite direction to the direction of threaded rod rotation (direction A). The stress transmitted to loosening portion side end 13 acts to reduce the diameter of coil spring portion 1, but this stress is small because it is also distributed to tightening portion 2, and coil spring portion 1 cannot be deformed any further, so loosening portion side end 13 and large diameter portion 11 do not come into contact with threaded rod 300. Therefore, loosening portion side end 13 of the coil spring does not tighten threaded rod 300. In addition, the stress transmitted to the fastening portion side end portion 12 acts to increase the diameter of the coil spring portion 1, so that the fastening of the threaded rod 300 becomes weaker. That is, when the threaded rod 300 rotates in the forward direction (direction B), the loosening portion side end 13 hardly tightens the threaded rod 300, and the tightening portion side end tightens the threaded rod 300 less, so that the friction between the loosening prevention device 100 and the threaded rod 300 is smaller than when they are simply fitted together. And, when fitted onto the threaded rod 300, the loosening prevention device 100 hardly impedes the rotation of the threaded rod 300 in the forward direction (direction B), so it does not impede the maintenance work of tightening the turnbuckle.

[0022] Furthermore, the loosening prevention device 100 can be easily removed from the threaded rod 300. To remove the loosening prevention device 100 from the threaded rod 300, hold only the loosening portion 3 without touching the tightening portion 2, and rotate the threaded rod 300 in the backward direction (direction A) (FIGS. 10 and 11). As a result, the loosening portion side end 13 widens, the tightening at the portion connected to the large diameter portion 11 weakens, and no force is generated to tighten the threaded rod 300 starting from the tightening portion 2. This reduces friction between the loosening prevention device 100 and the threaded rod 300, allowing the threaded rod 300 to easily rotate in the backward direction (direction A). When the threaded rod 300 rotates in the backward direction (direction A), the threaded rod 300 retreats relative to the loosening prevention device 100, allowing the loosening prevention device 100 to be easily removed from the threaded rod 300.

[0023] The loosening prevention device of the present invention is not limited to the above-mentioned embodiment, and may include various modifications, changes, and improvements to each disclosed element (including elements described in the claims, specification, and drawings) within the scope of the present invention and based on the technical idea of ​​the present invention. Also, various combinations, substitutions, and selections of each disclosed element are possible within the scope of the claims of the present invention. [Explanation of symbols]

[0024] 100 (for right-hand threads) Anti-loosening tool 1 Coil spring part 11 Large diameter section 12 Tip end (tightening end) 13 Rear end (loosening portion end) 2 Fastening section 21 Extension part 22 Turning section 23 Contact part 3 Loosening section 31 Extension part 32 Turning section 33 Contact part 200 Turnbuckle frame 300 (right) threaded rod 110 (for left-handed threads) Anti-loosening tool 310 (left) threaded rod

Claims

1. A turnbuckle loosening prevention device that prevents the threaded rod of a turnbuckle from loosening, A coil spring portion that is composed of a coil wire wound in a predetermined direction and that fits into a valley portion of the threaded rod; A tightening portion that extends outward from the end portion of the coil spring portion on the threaded rod tip side and can interfere with the turnbuckle frame; having When the threaded rod is rotated so as to retreat, the tightening portion interferes with the turnbuckle frame body, and the coil spring portion tightens the threaded rod.

2. The coil spring has a loosening portion extending outward from an end portion of the coil spring portion on the rear end side of the threaded rod, The coil spring portion includes a large diameter portion in which at least ¼ of a turn from an end portion on the rear end side of the threaded rod does not come into contact with the threaded rod into which it is fitted, The turnbuckle loosening prevention device according to claim 1, characterized in that when the threaded rod rotates forward and both the tightening portion and the loosening portion interfere with the turnbuckle frame, the end portion of the coil spring portion on the rear end side of the threaded rod does not come into contact with the threaded rod.

3. The turnbuckle loosening prevention device according to claim 1 or 2, characterized in that the coil spring portion is wound in a range of 1 to 7 turns.

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