JP3137118U - Bolts and nuts that do not loosen due to strong vibration - Google Patents

Abstract

[PROBLEMS] To realize bolts and nuts that can be manufactured at low cost by conventional simple machining techniques, can use the conventional bolt and nut standards as they are, and do not loosen even under strong vibrations.
A bolt 1 includes a nut portion 3 for tightening a bolt 9. The direction of tightening is threaded so that the nut 5 and bolt 9 always rotate in opposite directions. The elastic body 7 is sandwiched between the nut 5 and the bolt 9 so as to transmit the rotational motion. After the workpiece 4 is tightened with the bolt 1 and the nut 5, when the nut 5 is rotated by vibration or the like, the movement is transmitted to the elastic body 7, and when the bolt 9 is rotated in the same direction, The bolt 9 does not loosen, but tightens the elastic body 7 and the nut 5. As a result, the nut 5 cannot rotate for loosening. Bolts and nuts that do not loosen are realized using a structure that cancels out in the opposite direction.
[Selection] Figure 1

Description

In the present invention, when the nut tightened on the bolt loosens, the nut rotates and loosens. The bolts and nuts that do not loosen against vibrations, and that the rotation of the nut counterclockwise counteracts with the rotation of the nut counteracts the rotation of the nut and the other bolt and the nut does not move. is.

If a conventional bolt and nut are tightened with a strong force and then subjected to strong vibrations, the strong force tightened will cause the nut to loosen with the same repulsive force due to the principle of the screw. The nut started to loosen with a slight trigger. To prevent the nut from loosening, place a spring washer or chrysanthemum washer between the bolt and nut to prevent it from coming loose. This was not as effective as expected. In addition, the bolt and nut are bonded with an adhesive, the nut is fixed with another fixing plate, etc., is not turned around, a hole is made in the bolt and nut, a pin is inserted as a lock to fix the bolt and nut, and the nut is not turned. The idea of doing was done.
In any of these methods, the manufacturing process or the assembly process is increased, and the cost is increased due to the complexity of processing and the like.

The present invention should be able to be easily manufactured using the conventional work technology as it is. In addition, the bolts and nuts (screws) that do not loosen even with continuous vibration are realized, considering that the existing standards such as bolt and nut sizes and pitches can be used as they are.

As shown in FIG. 1, a bolt and a nut (screw) that are not loosened by vibration are provided with an inner nut portion 3 on which the bolt 9 can be rotated and tightened.
A clockwise (or counterclockwise) thread 2 is attached to the outer portion of the bolt 1. The nut portion 3 on the inner side of the bolt 1 is provided with a screw thread in the opposite direction, which is different from the screw thread of the outer portion. The workpiece 4 or the like 4 is sandwiched and tightened with a nut 5 having a thread in the same direction as the thread of the outer portion of the bolt 1.
The both sides of the nut 5 are irregularly provided with irregularities 6 in order to increase the frictional resistance. Next, an elastic body 7 having a high frictional resistance (irregular irregularities 6 are provided to increase the frictional resistance) is inserted. As a result, the back-returning rotation of the nut 5 can be transmitted to the elastic body 7 as it is. In order to tighten the elastic body 7, the bolt 9 is rotated and fastened to the nut portion 3 of the bolt 1. The inner surface of the head of the bolt 9 is irregularly provided with irregularities 6 in order to increase the frictional resistance. (FIG. 5) When the reference bolt 9 is loosened, the direction of rotation is tightened by the inner nut portion 3 with the opposite screw thread different from the screw thread 2 of the outer portion of the bolt 1, so that the nut 5 is loosened. The rotation opposite to the rotation direction is always taken. After the workpiece is tightened with the bolt 1 and the nut 5, when the nut 5 is rotated by vibration or the like, the movement is transmitted to the elastic body 7, and when the bolt 9 is rotated in the same direction, the bolt 9 Since it rotates along the screw thread of the nut part 3, it does not loosen but tightens the elastic body 7. As a result, the elastic body 7 is tightened and the nut 5 cannot be rotated for loosening.
A nut that has received strong vibration or the like rotates and loosens along the thread 2 of the outer part of the bolt 1, and the nut inside the opposite direction is different from the thread 2 of the outer part on the inner diameter part of the bolt 1. Utilizing the property of the bolt 9 that rotates and loosens along the thread of the portion 3, the rotation of the nut 5 and the rotation of the bolt 9 are opposite to each other so that the rotating forces cancel each other and the nut 5 does not loosen. .
The material of the elastic body 7 is synthetic rubber, plastic, metal or the like. Further, the thickness of the elastic body 7 varies depending on the length of the bolt 1 and the thickness of the nut 5 and the workpiece 4.

Conventionally, the nut is tightened with a strong force so as not to loosen. Therefore, if the tightening force was too strong, the screw thread was broken. In addition, a. In order to prevent loosening, the adhesive was fixed on the bolt and nut, and the nut was fixed with another fixing plate to prevent it from moving, or a hole was made in the bolt and nut, and a pin was inserted to prevent loosening. B. As a simple method, a spring washer and a nut with nylon were used to prevent loosening. In each of the methods, the assembly work process and parts were separately required, resulting in an increase in cost. The method of B could not completely prevent the nut from loosening.
The present invention attaches an inner nut portion 3 with a screw thread in the opposite direction different from the outer thread 2 to the inside of a bolt of various lengths without changing the standard size of the conventional bolt. A bolt 9 is inserted into the nut portion 3 and rotated to tighten the elastic body 7 so that the nut 5 comes into contact with the elastic body. By sandwiching an elastic body between the nut 5 and the head of the bolt 9, the rotating force cancels out because the rotation of the nut 5 and the rotation of the bolt 9 are opposite to each other. As a result, the nut 5 tightening the workpiece 4 does not loosen. With a nut that has been tightened only with a conventional strong force, the nut may begin to loosen with a slight trigger under strong and continuous vibration. The present invention utilizes the action of canceling out the rotating forces because the rotation of the nut 5 and the rotation of the bolt 9 are opposite to each other on the premise of being loosened.
As an effect of the present invention, in the work of tightening with a strong force, it is not necessary to have the skill level to stop at the last minute to break the screw thread. Anyone can easily tighten with normal power. In particular, in a process where vibrations occur continuously or intermittently, the rotation of the nut 5 is stopped by the rotation of the bolt 9 and does not loosen. In order to inherit the length, size, etc. of conventional bolts as they are, even if products are manufactured using conventional bolts and nuts (screws) as parts, the bolts of the present invention can be used without changing the production process. Nuts (screws) can be used as they are.

As shown in FIG. 1, the bolt and nut (screw) that does not loosen even with vibration according to the present invention is provided with an inner nut portion 3 into which the bolt 9 can be rotated and inserted.
A clockwise (or counterclockwise) thread 2 is attached to the outer portion of the bolt 1. The inner nut portion 3 is provided with an opposite thread different from the outer thread 2.
The workpiece 4 is fastened with a nut 5 having a screw thread in the same direction as the screw thread 2 of the outer portion of the bolt 1 and the bolt 1. Next, the tip end portion of the thread 2 of the bolt 1 protruding from the nut 5 is inserted into the hole of the elastic body 7 having high frictional resistance. Thereafter, the bolt 9 is inserted into the nut portion 3 of the bolt 1 and rotated to tighten the elastic body 7. The thickness of the elastic body varies depending on the thickness of the workpiece and the nut. The elastic body 7 is sandwiched between the nut 5 and the bolt 9.
When the nut 5 loosens and tries to rotate, the movement is transmitted to the elastic body 7. Bolt 9 has
The rotational motion of the nut 5 is transmitted from the elastic body 7 as it is. When the bolt 9 is rotated in the same direction, the bolt 9 is inserted into an inner nut having an oppositely threaded thread 3 different from the thread 2 of the outer part of the bolt 1, so that the rotation of the bolt 9 is not loosened. On the contrary, the elastic body 7 is tightened.
As a result, the rotation of the nut 5 cancels out by the rotation of the bolt 9, and the nut 5 does not loosen.

  The perspective view for showing the example of the present invention.   Side view and front view of bolt 1 A screw thread 2 that is clockwise (or counterclockwise) is attached to the outer shape of the bolt 1. The inner part is provided with a thread 3 opposite to the outer part, which is different from the outer part. The length and inner diameter of the inner part are changed depending on the size of the bolt 1 and the like. Further, the pitch of the thread 2 and the thread 3 is changed depending on the workpiece. Bolt 1 is a bolt having a nut portion of bolt 9.   Side view and front view of nut 5 Irregularities 6 are irregularly formed on both sides of the nut.   Side view and front view of elastic body 7 Irregularities 6 are irregularly formed on both surfaces of the elastic body.   Front view and side view of bolt 9 Irregularities 6 are irregularly formed inside the head of the bolt. The thread 8 of the bolt 9 is the same as the thread 3 of the inner part of the bolt 1.   Front view and side view of elastic body 7 bonded to bolt 9   Sectional drawing which shows the state when used. It is an assembly structure diagram of the bolt 1 and nut 5 and the elastic body 7 and the counter-rotating bolt 9 for sandwiching the workpiece 4. The thickness of the elastic body of the anti-rotation bolt varies depending on the thickness of the workpiece to be sandwiched.

Explanation of symbols

1 Bolt body with a nut on the inside.
2 A clockwise (or counterclockwise) thread.
32 Threads in the opposite direction that are different from the 2 thread. Nut portion 4 of bolt 9 Work piece 5 Nut 6 Concave and convex portion 7 for increasing frictional resistance Elastic thread 8 Opposite screw thread different from screw thread 2 of the outer portion of the bolt body. Same as 3.
9 Bolt with 6 irregularities inside the bolt head

Claims (5)

  Attach the screw thread 2 that is clockwise (or counterclockwise) to the outer part of the bolt 1, and attach the nut part 3 of the screw thread that is opposite to the outer thread 2 to the inner diameter part of the inner side of the same bolt. Bolt. See [Figure 2]   Nut with irregularities on both sides to increase frictional resistance. See (Figure 3)   Elastic body with unevenness on both sides to increase frictional resistance. See (Figure 4)   A bolt with irregularities on the inner surface of the head of the bolt 9 in order to increase the frictional resistance. See (Figure 5)   A bolt having a structure in which the elastic body 5 is directly attached to the inner part of the head of the bolt 9. See (Fig. 6)

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