Bolt nut set

Abstract

To provide a bolt nut set in which loosening is prevented.SOLUTION: In a bolt nut set, a notch part and a groove are provided in an axial direction of a nut 1 and a seat metal 3, which are engaged to synchronize the rotations of the nut and the seat metal. With this configuration, the bolt nut set can greatly reduce the loosening of a screw and repeatedly used without exposing a screw surface to outside and without using a tool but only by an operation of the bolt 2 and accompanying lever and hook. Further, the rotations of the bolt and the nut can be synchronized by easily fixing the seat metal and the bolt. With this configuration, the bolt nut set can perform a screw loosening-prevention that can be repeatedly used without exposing a screw surface to outside and without using a tool but only by an operation of the bolt and accompanying lever and hook.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a bolt and nut set that can be easily attached and detached without using tools and does not become loose. [Background technology]

[0002] The present invention relates to a bolt and nut set consisting of a bolt and a nut. Screws can become loose due to vibration or movements such as rotation, swivel, and swing in the area where they are used. In particular, when a screw is used as a fulcrum for rotation, swivel, or swing, the rotating, swivel, or swing movement applies a torque to the screw in the rotational direction, making the screw prone to loosening. To prevent loosening, a double nut or other structure can be considered, but the thread surface is exposed when the nut side is operated, which makes the thread more susceptible to deterioration. In addition, many of them have multiple parts that need to be operated, so you need to understand their structure, and many of them require tools to tighten them.

[0003] As an improvement measure, Patent Document 1 discloses that the outer slanted edge of a dish-shaped washer is pressurized and bent from both sides to prevent loosening. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Jpn. Jpn. Published No. 46-016665 Summary of the Invention [Problem to be solved by the invention]

[0005] Conventional techniques cause loosening of screws. Specifically, in conventional techniques, even if the bolt and nut in a bolt-nut set are screwed tight, the screw will loosen with continued use, and the screw must be tightened again with a tool. In particular, when snowboarding on a snowy mountain, it may be difficult to obtain tools. An object of the present invention is to provide a bolt and nut set that does not loosen. [Means for solving the problem]

[0006] In order to solve the above problems and achieve the purpose, a notch or groove is added to the axial direction of the nut and washer, and by engaging these, the rotation of the nut and washer is synchronized, and thus the rotation of the nut and bolt is synchronized. Furthermore, the rotation of the bolt and nut is synchronized by easily stopping the rotation of the washer and bolt with a lever. Effect of the Invention

[0007] According to the present invention, a bolt and nut set that does not loosen can be provided. [Brief description of the drawings]

[0008] [Figure 1] 1 shows a screw structure of a comparative example. [Diagram 2] 2 to 10 show the structure of the present invention. Fig. 2 is an explanatory diagram showing a method of implementing the bolt and nut set (Example 1). [Diagram 3] Figure 3 shows the parts diagram of the nut. [Figure 4] Figure 4 shows a detailed view of the nut groove. [Diagram 5] Figure 5 shows the parts diagram of a washer. [Figure 6] Figure 6 shows a detailed view of the washer groove. [Figure 7] FIG. 7 is an explanatory diagram showing a method for implementing the bolt and nut set (Example 2). [Figure 8] FIG. 8 shows a parts diagram of the washer having the structure shown in FIG. [Figure 9] FIG. 9 shows a parts diagram of the bolt and lever of the structure shown in FIG. [Figure 10] FIG. 10 is an explanatory diagram showing a method for implementing the bolt and nut set (Example 3). [Figure 11] FIG. 11 is an explanatory diagram showing a method for implementing the bolt and nut set (Example 4). [Figure 12] FIG. 12 is an explanatory diagram showing a method for implementing the bolt and nut set (Example 5). [Figure 13] FIG. 13 shows an example of a comparative example of the screw structure of a hinge of a highback of a snowboard. [Figure 14] FIG. 14 shows an example in which the bolt and nut set according to the present invention is applied to the screw structure of the hinge of a highback of a snowboard. [Figure 15] FIG. 15 shows the experimental results regarding loosening of the screws in the comparative example, the first embodiment, and the second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, specific examples will be described with reference to the accompanying drawings. Note that the embodiment is not limited to the specific examples described below.

[0010] [Comparative Example] In the following description of FIG. 1, the direction of gravity is referred to as the "Z-axis direction." The directions of the axes perpendicular to the Z-axis direction are referred to as the "X-axis direction" and the "Y-axis direction." The XY plane is the horizontal plane. Therefore, the X-axis direction and the Y-axis direction are perpendicular to each other. In addition, in the following description, the Z-axis direction coincides with the "axial direction" of the screw.

[0011] FIG. 1 shows an exploded view and an assembly view of a comparative example. The nut 1 and bolt 2 tighten together, via a washer 3 intended to prevent loosening, a fixed member or a member 4 that moves in a rotating, swiveling, oscillating, linear motion, etc., and a member that moves in a rotating, swiveling, oscillating, linear motion, etc., or a fixed member 5. In this comparative example, a torque in the rotational direction is applied to the screw by the rotating, pivoting, and swinging motion, and the screw that engages the nut 1 and the bolt 2 becomes easily loose.

[0012] FIG. 2 is an exploded view and an assembly view of the first embodiment of the device of the present invention. By adding a notch or groove in the axial direction of the nut 1 and washer 3 and engaging these, the rotation of the nut 1 and washer 3 is synchronized, thereby synchronizing the rotation of the nut 1 and bolt 2.

[0013] Fig. 3 is a parts diagram of the nut 1. Specifically, Fig. 3 shows three views of the nut 1 shown in Fig. 2. Hereinafter, screw sizes will be indicated based on JIS B 0205:2001 (metric threads, coarse threads) in the Japanese Industrial Standards (JIS). For example, the thread size of the female screw portion formed in the nut 1 is M6 (thread root diameter 6 mm). However, the thread size is not limited and may be any other size from M20 to M3. FIG. 4 shows the cutout portion of the nut 1. Hereinafter, an example in which two cutout portions, a first cutout portion 100 and a second cutout portion 101, are formed as the cutout portion shown in FIG. In addition, although the notch width is set at 4 mm, there is no restriction on the width of the notch as long as the notch is not deformed by rotational force. However, even for small diameter screws, the width of the notch in the circumferential direction should preferably be at least 2 mm. Since the first cutout portion 100 and the second cutout portion 101 are formed by a cutting tool or the like, if they do not have a certain degree of width, the cutting tool cannot be inserted, making manufacturing difficult. Therefore, if the width is about 2 mm or more, it can be easily manufactured even with inexpensive cutting tools. Although there are two notches, the number is not limited. As long as the notch width is secured, the number of notches is not limited. However, one or two notches are preferable. Increasing the number of notches complicates manufacturing and reduces the number of threaded portions. This results in too few areas where the screws mesh, which may affect strength, etc. On the other hand, if there are two notches and the ratio of notches to threaded portions is about the same, there is little effect on strength, etc. Even if there are two cutouts, as long as they are positioned opposite each other like the first cutout 100 and the second cutout 101 shown in Fig. 4, both can be manufactured with a single cutting tool, so the manufacturing load remains the same. In this way, by limiting the number of cutouts to two or less, strength can be improved and manufacturing costs can be reduced. For example, the notch is formed by cutting a part of the circumference of the nut 1 with a file, grinder, or cutting tool. 4, it is desirable to form the notches at opposing positions symmetrically about the center point in the circumferential direction of the nut 1. By forming the notches at opposing positions in this way, if the cutting tool is sufficiently longer than the diameter of the nut 1, multiple notches can be formed in one cutting operation, and the notches can be formed efficiently. In this way, the nut 1 has a female thread portion and a first fitting portion formed in the circumferential direction. The ratio of the female thread portion to the first fitting portion is not limited. Because the female thread portion is formed, when the male thread portion of the bolt 2 is inserted into the nut 1, the threads mesh, and the nut 1 and the bolt 2 can be loosened or tightened by moment. On the other hand, the first cutout portion 100 and the second cutout portion 101, which are examples of the first fitting portion, become the recesses of the fitting portion. Therefore, the protrusions of the second fitting portion of the washer 3 are inserted into the first cutout portion 100 and the second cutout portion 101 and engage with them. Therefore, the dimensions of the first cutout portion 100 and the second cutout portion 101 are manufactured to match the dimensions of the second fitting portion of the washer 3.

[0014] FIG. 5 is a part drawing of a washer. Fig. 6 is a detailed view of the cutout portion of the washer, showing the washer 3 in Fig. 2 as viewed from below. The third cutout portion 200 and the fourth cutout portion 201 of the washer 3 respectively engage with the first cutout portion 100 and the second cutout portion 101 of the nut 1. Therefore, the circumferential positions and dimensions (including the fit) of the third cutout portion 200 and the fourth cutout portion 201 of the washer 3 are formed to match the first cutout portion 100 and the second cutout portion 101 of the nut 1. The nut 1 is provided with one or more notches or grooves to form a first fitting portion. Meanwhile, the washer 3 is provided with notches or sliding portions that engage with the notches or grooves of the nut to form a second fitting portion. The nut 1 and washer 3 are engaged by fitting the first fitting portion and the second fitting portion in this way, so that the washer 3 moves linearly in the axial direction (the Z-axis direction in FIG. 1), but its rotation is synchronized with the rotation of the nut 1 (rotation around the Z-axis, i.e., yaw axis rotation). Since no threads are formed on the inner circumference of washer 3, there is no constraint between bolt 2 and washer 3 even when bolt 2 passes through the through hole of washer 3. Therefore, washer 3 moves linearly in the axial direction. Since the bolt 2 is in contact with the washer 3, the rotations of the nut 1 and bolt 2 are synchronized, and loosening of the screw can be significantly reduced. That is, the head of the bolt 2 serves as a handle for inputting a moment, and the size of the head of the bolt 2 is larger than the size of the through hole of the washer 3. Therefore, the washer 3 does not come off the bolt 2, and is pressed against the nut 1 side (downward in the Z-axis direction in FIG. 1) by the head of the bolt 2. This pressing causes the first fitting portion and the second fitting portion to engage, and the engaged state is maintained without coming off in the Z-axis direction. The number and width of the notches in the washer 3 are not limited, just like the notches in the screw. Bolt 2 is composed of a head, which is an example of a moment input part, and a female screw part. The moment part is preferably large enough to be held by hand. Since the moment is input to the head, if the diameter is larger than the female screw part, it is easier to transmit a large moment.

[0015] [Example 2] FIG. 7 shows an exploded view and an assembly view of the second embodiment of the device of the present invention. Compared to Example 1, Example 2 is different in that a lever 6 is added to the bolt 2. Furthermore, the lever 6 realizes a "second synchronizing portion" that synchronizes rotation with the washer 3. The second synchronizing portion is realized by the lever 6 and the washer 3. Compared to the first embodiment, the washer 3 has a disk portion having a larger diameter than the first embodiment in order to realize the second synchronizing portion. A fixing portion capable of fixing a protrusion formed on the lever 6 is formed in the circumferential direction of the disk portion. The fixing portion is formed, for example, at a position where the protrusion of the lever 6 comes into contact. The shape, etc. of the fixing portion is not important as long as the protrusion of the lever 6 can be caught therein. The lever 6 is formed in a direction from the head toward the circumference. The lever 6 is formed with a protrusion that protrudes in the direction of the washer 3. By adding notches to the nut 1 and washer 3 and engaging them, the nut 1 and washer 3 are synchronized in the rotational direction, and furthermore, the bolt 2 is equipped with a lever 6, which utilizes the elastic deformation of the washer 3 to fix it in one operation. This synchronizes the rotation of the nut 1 and bolt 2, and the screw will not loosen. This completely prevents the possibility of the screw loosening caused by rapidly turning the nut when the bolt is not tight enough, as seen in the structure shown in Figure 2. The threaded surface is not exposed to the outside, and the lever 6 is provided on the bolt 2, so that when screwing, the lever 6 can be used to rotate the bolt, and since there is only one operating part, the screwing and fixing operations can be easily performed. The bolt 2 and the lever 6 can be operated manually, so no tools are required, and the lever 6 is fixed by elastic deformation of the lever 6, so it can be used repeatedly.

[0016] Fig. 8 is a diagram showing a part diagram of washer 3 in Example 2. Washer 3 is provided with a notch for engaging with a nut and a groove that serves as a fixing portion for fixing to a bolt. This groove is a 3 mm spherical shape in Fig. 6, but since it is for fixing the protrusion of lever 6, it is not limited to this shape.

[0017] Figure 9 shows a parts diagram of the bolt 2 and lever 6 of the structure shown in Figure 7. Lever 6 is rotatably mounted on the head of bolt 2 (with the Y-axis as the center of rotation, a so-called pitch rotation) and is fixed to the washer by a ball (projection) at its tip. The lever portion is formed into a rod shape that extends in the radial direction. The position where the lever portion is formed and its length are determined by the positional relationship that allows it to be fixed to washer 3. As a result, bolt 2 and washer 3 are synchronized in the rotational direction, and washer 3 is synchronized with the rotation of nut 1, so the screw will not loosen. The ball (projection) at the tip of lever 6 is for fixing to washer 3 and is not limited to this shape. However, it is preferable that the projection has a size of φ3 or more to ensure strength.

[0018] [Example 3] 10 is a diagram illustrating a method of implementing the bolt and nut set. Compared with Example 1, Example 3 is different in that the first and second fitting portions are realized by grooves, not by notches. The nut 1 and the washer 3 are provided with grooves and are engaged to synchronize the nut and the washer. The rest of the structure is the same as in Figure 7. The groove is easier to manufacture than the notch, and leaves more of the threaded portion.

[0019] [Example 4] FIG. 11 is an explanatory diagram showing a method of implementing the bolt and nut set. The washer 3 and bolt 2 are fixed by hooking the washer 3 with a lever 6 and a hook 7 attached to the bolt 2. Example 4 differs from Example 2 in that it has a structure in which the washer 3 is hooked with the hook 7, not with the protrusion of the lever 6. Such a structure of the hook 7 makes it easier for the user to perform the hooking operation. The rest of the structure is the same as in FIG. 7.

[0020] [Example 5] FIG. 12 is an explanatory diagram showing a method of implementing the bolt and nut set. To secure washer 3 and bolt 2, hook 7 installed inside lever 6 installed on washer 3 is hooked onto the head of bolt 2 and lever 6 is lowered to secure the bolt head. The bolt head may be pinched between hook 7 and lever 6 when lever 6 is lowered. Many bolt heads have multiple sawtooth grooves, and the contact surfaces of hook 7 and lever 6 with the head of bolt 2 may be shaped to have grooves that fit into the multiple grooves of bolt 2, and the multiple grooves may be hooked onto the multiple grooves of bolt 2. The rest of the structure is the same as in Figure 7.

[0021] A typical example is a screw used in the hinge of a highback used in a snowboard binding. Since this screw is used outdoors in the snow, it is necessary to easily attach and remove it without using tools and to prevent it from loosening. When using a snowboard, the highback is used standing upright on the snowboard to support the snowboard boots, but when transporting or not in use, it is folded up around the hinge of the binding. The highback hinge uses a screw for rotating and adjusting the position of the highback, and the highback is folded up when boarding the lift or taking a break to put on and take off boots, and is stood up when in use, so the screw becomes the fulcrum of the hinge and this nut rotates following the movement of the highback. In order not to impede this rotational movement, the screw must be tightened appropriately, and cannot be tightened too tightly. Because the hinge needs to pivot every time the boot is put on or taken off, this screw often becomes loose, and if the loosening continues, the screw will fall out, causing the highback to be unable to support the boot, creating a very dangerous situation. For this reason, there is a need for screws that will not loosen while maintaining an appropriate tightening force.

[0022] FIG. 13 shows an example of a comparative example of the screw structure of a hinge of a highback of a snowboard. The nut 1 rotates following the reciprocating highback 8. The bolt 2 is tightened, but even if a washer 3 or the like is used to prevent loosening, the screw may loosen as the highback 8 moves back and forth.

[0023] FIG. 14 shows an example in which the bolt and nut set according to the present invention is applied to the screw structure of the hinge of a highback of a snowboard. The nut 1 has a notch or a groove. The number of notches or grooves is not important. Figure 12 shows an example of two notches. The washer 3 has a notch or groove that fits into the notch or groove of the nut. Also, a number of holes or grooves are provided for connection with the bolts 2. The bolt 2 is provided with a lever 6 or a hook (not shown) for synchronizing the rotation with a washer. This synchronizes the rotation of the bolt 2 and the nut 1, and prevents loosening even when the highback 8 rotates.

[0024] FIG. 15 shows the change in loosening torque with respect to the reciprocating motion of the highback for a prototype comparison product, a bolt set in which notches are made in the nut 1 and washer 3 to synchronize their rotation (Example 1), and a bolt set in which notches are made in the nut 1 and washer 3 and the bolt and washer are further fixed (Example 2). In Example 2, a simple device was used in which the washer and bolt were fixed with a clip after the bolt was tightened. M5 screws were used, and the standard torque for M5 screws is 3 Nm, but to make it easier to rotate the highback, they were tightened with a torque of 1.5 Nm, which makes the screws easier to loosen. The highback was moved from the bottom to the top around the hinge of the highback, and then reciprocated from the top to the bottom. This motion was taken as the highback reciprocating motion, and the number of such movements was plotted on the horizontal axis of the graph in FIG. In addition, the torque required to loosen the screw after a certain number of times was measured, and this torque was taken as the loosening torque and is plotted on the vertical axis of FIG. In the case of the screw, the screw torque dropped to 0.3 Nm, which is the measurement limit of the torque wrench, after one full stroke of the high back, and loosening occurred. However, in the bolt set with the rotation-synchronized parts of Nut 1 and Washer 3, the torque did not drop until four full strokes of the high back, and the number of strokes until loosening was greatly improved. Furthermore, in the case of a rotationally synchronized nut-washer-bolt product in which the bolt 2 and washer 3 were fixed, no loosening occurred even after 10 reciprocations.

[0025] This structure prevents the serious defect of loosening of screws, and has great potential for use in a variety of products and industries that use screws. This structure may also be applied to furniture, building materials, etc. However, this structure is suitable for products used in environments where it is difficult to carry tools and where there is vibration or the like that can easily loosen screws, such as snowboards, skis, snowmobiles, child seats for automobiles, baby strollers, and wheelchairs. [Explanation of symbols]

[0026] 1 Nut 2 Volts 3 Washer 4 Fixed components or components that rotate, pivot, swing, move linearly, etc. 5. Rotating, swiveling, oscillating, linear, etc., moving parts or fixed parts 6 Lever 7. Hook 8 High Back

Claims

1. A bolt and nut set comprising: a nut having a female thread portion formed in a portion of its circumference in the circumferential direction and a first fitting portion formed in a portion of its circumference in the circumferential direction; a moment input portion that receives a moment in the circumferential direction and a bolt having a male thread portion that is inserted into the female thread portion; and a washer that is sandwiched between the nut and the bolt, has a through hole, and is formed with a second fitting portion that fits with the first fitting portion, The first fitting portion and the second fitting portion are formed in the axial direction of the nut and the washer, and when the nut and the washer are fitted in the axial direction, the first fitting portion and the second fitting portion engage with each other, and when either the nut or the washer rotates, the rotation is transmitted by the first fitting portion and the second fitting portion, and the other, which is different from the one to which the rotation has occurred, rotates in sync with the rotation, and the bolt passes through the through hole, and the male thread portion is inserted into the female thread portion, and when the moment is applied to the moment input portion, the male thread portion is inserted into the female thread portion, and a bolt and nut set is formed with the washer sandwiched between the moment input portion and the nut.

2. The bolt and nut set according to claim 1 , wherein the bolt further comprises a lever portion formed radially from the head portion and having a protrusion that hooks onto the washer.

3. 2. The bolt and nut set according to claim 1, wherein the washer has a hook that catches on the head of the bolt and a lever portion that fixes the hook to the head of the bolt.

4. The bolt and nut set according to claim 1 , wherein the first fitting portion and the second fitting portion are notched portions or grooves.

5. The bolt and nut set according to any one of claims 1 to 3, wherein the female screw portion and the male screw portion are in a range from M3 to M20.

6. 4. The bolt and nut set according to claim 1, wherein the first fitting portion and the second fitting portion are cutout portions formed in the nut and the washer, respectively, and the widths of the cutout portions of the nut and the washer are from 2 mm to 15 mm.

7. The bolt and nut set according to claim 6 , wherein the notch portions of the nut and the washer are formed at one or two locations on each of the nut and the washer.

8. The bolt and nut set according to any one of claims 1 to 3, which is used for a hinge of a highback of a snowboard.

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