JP2001124043A - Nut - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a nut capable of giving a large rotational resistance to a bolt, certainly preventing this and a bolt fixing an object from loosening, and assuring easy rotating operation of the nut relative to the bolt. SOLUTION: The nut includes a body 2 and a loosening preventing member 3 installed on the nut body 2. The loosening preventing member 3 is equipped with resilient pieces 32b and 32c, which have a pressing part 33 and a resistance giving part 34 formed spirally. When the nut is engaged with a bolt 100 and rotated, the pressing part 33 abuts to an object H to generate pressing, and accordingly the resistance giving part 34 makes displacement and touches the threads 103 of the bolt 100 to give them a resilient force, and thereby the nut and bolt can certainly be prevented from loosening.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved nut, and more particularly, to an improved nut capable of preventing a bolt from being loosened.

[0002]

2. Description of the Related Art When an object to be fixed is fixed with a bolt and a nut by screwing the nut to the bolt and tightening, a loosening of the screw occurs between the nut and the bolt after the object to be fixed is fixed. There are cases. For this reason, conventionally, a nut has been proposed that prevents loosening of a screw between a tightened nut and a bolt. The nut a has a seat b1 on its lower surface as shown in FIGS. 10A and 10B, for example.
, And an elastic disk-shaped loosening prevention member c fixed to the upper surface side of the nut body b. A plurality of cutting grooves c1 are radially formed on the inner peripheral side of the loosening prevention member c.
By providing c1, a plurality of elastic pieces c2 are provided therebetween.
c2, and the tip portions of the elastic pieces c2... c2 are used as resistance applying portions c3... c3, and the resistance applying portions c3.
A bolt insertion hole c4 for passing the bolt 100 is formed on the inner peripheral side of the bolt. Then, as shown in FIG.
Are screwed into the bolt 100 from the lower surface side, the resistance applying portions c3... C3 abut against the slope of the thread 103 of the male screw 101 of the bolt 100 and are elastically deformed, and apply an elastic force to the thread 103. This applies a rotational resistance to the nut body b on the bolt 100. Therefore, from this state,
The nut body b is fixed to the object H by the seat surface b1 of the nut body b.
The bolt H is tightened against the rotation resistance to fix the object H until it comes into contact with the bolt 100, so that the screw between the nut body b and the bolt 100 is loosened by the rotation resistance due to the elastic force of the loosening prevention member c. Can be suppressed. However, in this case, since the resistance applying portions c3... C3 are brought into contact with the slope of the thread 103 of the male screw 101 of the bolt 100 to be elastically deformed and only apply the elastic force accompanying the elastic deformation, 100 cannot have enough rotational resistance. When the resistance applying portions c3... C3 of the loosening prevention member c reach the male screw 101 of the bolt 100, rotational resistance is applied to the nut body b and the bolt 100. Therefore, the resistance applying portions c3.
01, the rotation operation of the nut body b with respect to the bolt 100 from the time when the seat surface b1 of the nut body b comes into contact with the fixed object H also exerts a rotational resistance, and the rotation operation of the nut body b is difficult. The rotational operation of the nut body b becomes more difficult as the rotational resistance applied to the bolt 100 from the resistance applying portions c3... C3 increases. As a result, in this case, there is a problem that it is difficult to apply an excessively large rotational resistance to the bolt 100 from the resistance applying portions c3 to c3, and it is difficult to reliably prevent the screw between the nut body b and the bolt 100 from being loosened. .

[0003]

DISCLOSURE OF THE INVENTION The present invention has been proposed in view of the above circumstances, and a large rotational resistance can be applied to a bolt to reduce the loosening of a screw between a nut and a bolt that fixes an object. An object of the present invention is to provide a nut that can be reliably prevented and that can easily rotate the nut with respect to the bolt.

[0004]

The present invention solves the above-mentioned problems by providing a nut having the following features. According to the first invention of the present application, the nut main body 2 including the nut main body 2 and the plate-shaped loosening prevention member 3 having elasticity includes a female screw 21, and the female screw 21 is provided from the lower surface side of the nut main body 2. The object to be fixed H can be fixed to the lower side of the nut main body 2 by the nut main body 2 and the bolt 100 by being screwed and fastened to the male screw 101 of the bolt 100. A bolt 10 is provided inside the diameter of the loosening prevention member 3.
0 is provided with a resistance applying portion 34 for applying a rotational resistance to the nut main body 2.
Is arranged below the female screw 21. Further, the loosening prevention member 3 is provided with a pressing portion 33, and the pressing portion 33 is pressed from the fixed object H when fixing the fixed object H with the bolt 100 and the nut main body 2. Imparting section 3
4 is the male screw 1 of the bolt 100 screwed with the nut body 2
01, and the resistance applying section 34 applies the rotational resistance to the nut body 2 to the bolt 100 by this pressing.

[0005] A second invention of the present application includes the nut body 2 according to the first invention of the present application, and a plate-shaped loosening prevention member 3 having elasticity. The nut body 2 is provided with a female screw 21.
0, and the nut 1 and the bolt 1 are attached to the lower side of the nut 2
00 and the object H can be fixed. A resistance applying portion 34 for applying a rotational resistance to the nut body 2 to the bolt 100 is provided on the inner side of the loosening prevention member 3,
A nut main body mounting portion 31 is provided on the radial outside of the loosening prevention member 3, and the nut main body mounting portion 31 is mounted on the lower surface side of the nut main body 2, so that the resistance applying portion 34 is connected to the female screw 21 of the nut main body 2. Is coordinated below. Further, a pressing portion 33 is provided between the resistance applying portion 34 and the nut main body mounting portion 31 in the loosening prevention member 3, and the pressing portion 33 fixes the fixed object H with the bolt 100 and the nut main body 2. At this time, the loosening prevention member 3 is deformed by being pressed from the fixed object H, and the resistance applying portion 34 presses the male screw 101 of the bolt 100 screwed to the nut main body 2 by this deformation, The resistance applying part 34 applies the rotational resistance to the nut body 2 to the bolt 100.

According to a third invention of the present application, the loosening prevention member 3 according to the first or second invention of the present application is formed of a disk-shaped member, and a nut body mounting portion 31 is provided on the outer peripheral side. On the peripheral side, elastic pieces 32a, 32b, 32c having elasticity extending inward in the radial direction from the nut main body attaching section 31 are provided, and the elastic pieces 32a, 32b, 32c include a resistance applying section 34 on the distal end side. In addition, a pressing portion 33 is provided radially outside the resistance applying portion 34.

According to a fourth aspect of the present invention, there is provided a nut body 2 according to any one of the first to third aspects of the present invention, on a lower surface side of which is provided a seat surface 23 for abutting against an object to be fixed H, and a loosening prevention member. 3 is pressed downward from the seating surface 23 of the nut main body 2 so that when the nut H is fixed with the nut main body 2 and the bolt 100, the pressing portion 33 comes into contact with the fixed object H. And is pressed from the fixed object H.

According to a fifth aspect of the present invention, the nut 1 according to any one of the first to third aspects of the present invention is a ring-shaped pressing operation which is separate from the nut body 2 to which the loosening prevention member 3 is attached. A member 5 is provided, and the pressing operation member 5 is arranged between the pressing portion 33 of the loosening prevention member 3 and the object H, thereby fixing the object H with the nut body 2 and the bolt 100. At this time, the pressing portion 33 is pressed from the fixed object via the pressing operation member 5.

According to a sixth aspect of the present invention, the resistance applying section 34 according to any one of the first to fifth aspects of the present invention is configured such that the bolt 100
Is formed in a spiral shape along the lead of the male screw 101.

According to a seventh aspect of the present invention, the resistance applying section 34 according to any one of the first to sixth aspects of the present invention is configured such that the bolt 100
From one end in the circumferential direction on the front side with respect to the tightening direction of the nut body 2 with respect to the other end so as to gradually increase the amount of protrusion in the radially inward direction.

According to an eighth aspect of the present invention, the inner diameter of the resistance applying portion 34 according to any one of the first to seventh aspects of the present invention is larger than the root diameter R2 of the male screw 101 of the bolt 100, and
It is formed smaller than the thread diameter R3 of the male screw 101 of the bolt 100, and when the nut body 2 is screwed into the bolt 100, the resistance applying portion 34 can be inserted into the screw groove 103 of the male screw 101 of the bolt 100, With the pressing of the pressing portion 33 when the fixing object H is fixed by the nut body 2 and the bolt 100, the resistance applying portion 34 comes into contact with and presses the male screw 101 of the bolt 100.

In the first to fourth inventions of the present application, when the fixing object H is fixed by the bolt 100 and the nut main body 2, the pressing portion 33 is pressed from the fixing object H to be loosened. The prevention member 3 is deformed, and the deformation causes the resistance applying portion 34 to press the male screw 101 of the bolt 100 screwed to the nut main body 2, so that the resistance applying portion 34 causes the bolt 100 to rotate against the nut main body 2. Shall be given. By doing so, the nut body 2
By simply screwing the nut 100 onto the bolt 100, the resistance applying portion 34 does not press the male screw 101 of the bolt 100 screwed onto the nut body 2, and the rotation operation of the nut body 2 with respect to the bolt 100 can be facilitated. . On the other hand, bolt 10
When the fixing object H is fixed between the nut body 2 and the nut body 2, the loosening prevention member 3 is forcibly deformed by the pressing portion 33 and the bolt 100 screwed to the nut body 2 by the resistance applying portion 34.
To press the male screw 101, a large rotational resistance can be applied to the bolt 100, and the nut body 2 and the bolt 1
00 can be reliably prevented from loosening.

In the fifth invention of the present application, the nut operating body 5 and the bolt 100 are arranged by arranging the pressing operation member 5 between the pressing portion 33 of the loosening prevention member 3 and the fixed object H.
When the fixing object H is fixed by the above, the pressing portion 33 is pressed from the fixing object via the pressing operation member 5. For example, when the pressing portion 33 is directly contacted with the fixed object H and pressed, the seating surface 23 of the nut body 2 contacts the fixed object H after the pressing portion 33 contacts the fixed object H. Until,
Since the pressing portion 33 rotates together with the rotation of the nut body 2 and slides on the upper surface of the fixed object H, the pressing portion 33 has a sliding scratch on the upper surface of the fixed object H. However, in the fifth invention, when the nut 1 body 2 is screwed into the bolt 100 and rotated, the loosening prevention member 3
Can be brought into contact with and pressed by the pressing portion 33, thereby preventing the pressing portion 33 from being scratched on the upper surface of the object H.

In the sixth aspect of the present invention, since the resistance applying portion 34 is formed in a spiral shape along the lead of the male screw 101 of the bolt 100, the nut body 2 is
Even if it is screwed and rotated to the
00 can be rotated along the male screw 101,
The rotation operation of the nut body 2 with respect to the bolt 100 can be performed smoothly.

In the seventh aspect of the present invention, the resistance applying portion 34 is gradually moved from one end in the circumferential direction, which is the front side with respect to the tightening direction of the nut body 2 to the bolt 100, to the other end in the radially inward direction. Is formed so as to increase the amount of protrusion to the front. For example, as shown in FIG. 8, a long portion having a long distance V <b> 1 from the nut body attachment portion 31 is provided at one end in the circumferential direction on the front side with respect to the loosening direction of the nut 100 with respect to the bolt 100 (Y direction in the drawing). A nut 34a is formed at the other end in the circumferential direction, which is on the rear side with respect to the direction in which the nut body 2 is tightened with respect to the bolt 100 (the X direction in the drawing). If the short portion 34b having a short distance V2 from the main body mounting portion 31 is formed, the loosening prevention member 3 fixed to the nut main body 2 can be used.
Are rotated together with the rotation of the bolt 100 in the illustrated clockwise direction toward the tightening direction, when the loosening prevention member 3 is deformed due to the pressing of the pressing portion 33, the long side 34a of each resistance applying portion 34 Male screw 10 of bolt 100 in order
1 and is easily elastically deformed by contact with the bolt 1, and the elastic force can be reliably applied to the male screw 101 of the bolt 100. In addition, the long portion 34a is located on the rear side with respect to the tightening direction of the nut body 2 with respect to the bolt 100, and is located on the front side with respect to the loosening direction of the nut body 2 with respect to the bolt 100. The rotation resistance applied to the bolt 100 from the resistance applying part 34 is larger when the nut body 2 is rotated in the tightening direction side with respect to the bolt 100 than when the nut body 2 is rotated in the tightening direction side with respect to the bolt 100. Become. Therefore, when the nut body 2 is operated in the tightening direction with respect to the bolt 100, the rotation operation can be performed with a small rotation resistance, and the rotation operation of the nut body 2 can be easily performed. After fixing, the bolt 10 of the nut body 2
A large rotational resistance is applied to the loosening direction side with respect to 0, so that loosening of the nut body 2 with respect to the bolt 100 can be reliably prevented.

In the eighth aspect of the present invention, when the nut body 2 is operated in the tightening direction with respect to the bolt 100, the resistance applying portion 34 is inserted into the thread groove 103 of the male screw 101 of the bolt 100, 2 can be rotated on the bolt 100 with almost no rotational resistance, and the rotation operation of the nut body 2 can be facilitated. On the other hand, after the fixing object H is fixed with the nut body 2 and the bolt 100, the resistance applying portion 34 abuts against the male screw 101 of the bolt 100 and presses to apply resistance to the bolt 100, and the bolt of the nut body 2 10
Looseness to zero can be reliably prevented.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be specifically described below with reference to the drawings. 1 is a sectional view of an embodiment of the nut of the present invention, FIG. 2 is a plan view of a loosening prevention member, FIG. 3A is a sectional view taken along line III-III of FIG.
FIG. 4B is a sectional view taken along line IV-IV of FIG.

The nut 1 of the present invention includes a nut body 2 and
A slack preventing member 3. The nut main body 2 has substantially the same configuration as a general nut, and includes a regular hexagonal tool engaging portion 29 for engaging a tool on the outer periphery. Further, a screw hole 20 penetrating from the lower surface side to the upper surface side is provided, and a female screw 21 is engraved in the screw hole 20, and the female screw 21 is formed in the male screw 101 of the bolt 100 shown in FIG. The nut body 2 is screwed from the lower surface side. On the lower surface side of the nut body 2, a seating surface 23 that comes into contact with the object H when the object H (shown in FIG. 4) is fixed by the nut body 2 and the bolt 100, and a radial inside of the seating surface 23. And an anti-loosening member mounting portion 22 which is arranged at a predetermined position. The loosening prevention member mounting portion 22 is for mounting the loosening prevention member 3, and is formed by being depressed in a circular shape from the lower surface of the nut main body 2.

In the present embodiment, the loosening prevention member 3 is formed in a disk shape from a material having elasticity.
A nut body mounting portion 31 is provided, and three elastic pieces 32 a, 32 b, 3
2c is provided. The nut body attachment portion 31 is for attaching to the looseness prevention member attachment portion 22 of the nut body 2 and has a diameter capable of fitting into the looseness prevention member attachment portion 22 of the nut body 2 and has a flat shape over the entire circumference. Is formed.

The elastic pieces 32a, 32b, 32c are integrally extended radially inward from the nut body attaching portion 31, and are juxtaposed at predetermined intervals along the circumferential direction. A pressing portion 33 is provided on the outer peripheral side of each elastic piece 32a, 32b, 32c.
, And a resistance applying portion 34 is provided on the inner peripheral side. The pressing portion 33 is used to operate the resistance applying portions 34... 34, and is bent downward from the nut main body mounting portion 31 to protrude below the nut main body mounting portion 31.

The resistance applying portions 34 are formed so as to extend radially inward so as to face diagonally upward from the pressing portion 33. Inner peripheral diameter R of resistance applying portions 34.
1 is a male screw 1 of a bolt 100 to which the nut body 2 is screwed.
01 is smaller than the screw thread diameter R2 and the bolt 100
Is formed to be larger than the root diameter R3 of the male screw 101, so that a bolt insertion hole 37 through which a bolt is inserted is formed inside the diameter. The resistance applying portions 34... 34 are formed with the female screw 21 of the nut body 2 and the male screw 101 of the bolt 100 with which the nut body 2 is screwed.
Are arranged side by side in the circumferential direction so as to form a spiral along the lead. Specifically, the rear-side resistance applying portion 32a shown in FIG.
The right front end side of FIG.
Terminal 3 on the right rear end side of the resistance application section 32c on the right side shown in the figure.
34, the pressing portions 33 of the resistance applying portions 34... 34 sequentially in the counterclockwise direction as shown in FIGS. 3 (A) and 3 (B).
The end portion 36 is disposed at a position higher than the start end portion 35 by a distance of approximately one pitch P between the female screw 21 of the nut body 2 and the male screw 101 of the bolt 100 from the start end 35. Has been ranked.

The loosening prevention member 3 is formed such that the nut body mounting portion 31 is provided with the loosening prevention member mounting portion 22 of the nut body 2.
Is attached by an attaching means. In this embodiment, the nut body attaching portion 31 is attached to the nut body 2 by using a welding means such as spot welding.
To fix it. In this fixed state, as shown in FIG. 4, the resistance applying portions 34... 34 are arranged below the female screw 21 so as to be continuous with the lower end of the female screw 21. 34, the screw grooves 10 of the male screw 101 of the bolt 100
2 are sequentially inserted with a gap therebetween so as not to come into contact with the male screw 101. Also, in this fixed state,
The pressing portion 33 protrudes from the lower surface of the nut body 2.

Next, the function of the nut 1 of this embodiment will be described. For example, when the object H is fixed with a general bolt 100 having a head 110 and a male screw 101, as shown in FIG.
Is inserted from below into a bolt through hole H1 drilled in the fixed object H to project upward from the fixed object H, and the male screw 101 of the projected bolt 100 is inserted into the female screw 101 of the nut 1. The screw 21 is screwed from the lower surface side. At this time, the resistance applying portions 34... 34 are formed in the screw grooves 102 of the male screw 101 of the bolt 100 so as not to come into contact with the male screw 101, and the spiral shape along the lead of the male screw 101 of the bolt 100. , Even if the nut body 2 screwed to the male screw 101 of the bolt 100 is rotated with respect to the bolt 100, the resistance applying portions 34... It is possible to prevent the rotation of the bolt body 100 from being applied to the bolt 100 from the resistance applying portions 34... 34, and to smoothly rotate the nut body 2 with respect to the bolt 100.

Further, when the nut 1 screwed to the bolt 100 is rotated, as shown in FIG. 4, the pressing portion 33 of the loosening prevention member 3 in the nut 1 is located ahead of the seating surface 23 of the nut body 2. Abuts on the object H to be fixed. Further, when the nut 1 is rotated from this state, the loosening prevention member 3
The portion between the pressing portion 33 and the nut main body attaching portion 31 in is deformed, and the pressing portion 33 is pressed upward by the fixed object H and pushed up. 34 are also displaced upward with the pushing of the pressing portion 33, and the distal ends of the resistance applying portions 34.
And moves to the root 104 of the male screw 101 along the slope (see 15). When the resistance applying portions 34 move to the valley portion 104, even if the pressing portion 33 is further pushed up, the resistance applying portions 34.
34 cannot be moved, and as the pressing portion 33 is subsequently pushed up, the resistance applying portions 34... 34 attempt to elastically deform so as to curve downward, and as a result, the bolt 100
An elastic force is applied to the slope of the thread 103 below the male screw 101.

When the seat surface 23 of the nut body 2 comes into contact with the object H as shown in FIG. 5, the pushing-up of the pressing portion 33 stops, and the loosening prevention member 3 is further deformed. And the resistance applying portions 34.
00 while pressing the valley 104 of the male screw 101 in the radial direction to apply an elastic force.
Is pressed downward to maintain the state where the elastic force is applied. Further, the nut body 2 cannot rotate with respect to the bolt 100 in a state where the seat surface 23 of the nut body 2 is in contact with the fixed object H, and the tightening of the nut body 2 and the bolt 100 is completed. Therefore, in this state, the nut body 2 and the bolt 100 apply a rotational resistance due to the elastic force of the loosening prevention member 3 and do not loosen even when vibration or the like is applied. Can be kept. In the present embodiment, after the pressing portion 33 comes into contact with the fixed object H, the nut main body 2 is moved 1 /
The seating surface 23 of the nut main body 2 is set so as to contact the fixed object H when it is rotated about 12 rotations.
3 comes into contact with the fixed object H, and then the seat surface 23 of the nut body 2
Of the nut body 2 with respect to the bolt 100 required for the nut body 2 to come into contact with the fixed object H, in other words, the nut body 2
Of the pressing portion 33 from the seating surface 23 of the vehicle (shown in FIG. 4)
Can be changed as appropriate.

When the fixing object H is fixed as described above, the elastic force of the loosening prevention member 3 is reduced by the bolt 1 until immediately before the seating surface 23 of the nut body 2 contacts the fixing object H.
The rotation operation of the nut main body 2 with respect to the bolt 100 can be facilitated without having to perform the adjustment for 00.

In the present embodiment, the pressing portion 33 is provided so as to protrude below the seating surface 23 of the nut main body 2 so that the pressing portion 33 is brought into direct contact with the object H and pressed. However, the present invention is not limited to this embodiment. For example, the pressing member 5 may be brought into contact with the object H via the ring-shaped pressing member 5 and pressed. Specifically, as shown in FIG.
Is composed of a nut 1 main body 2, a loosening prevention member 3 fixed to the lower surface of the nut 1 main body 2, and a ring-shaped pressing operation member 5 separate from the nut 1 main body 2. Also, nut 1 body 2
A pressing operation member insertion hole 38 into which the pressing operation member 5 can be inserted is formed deeper than the thickness of the pressing operation member 5 from the lower surface inside the radially inner side of the seating surface 23 on the lower surface of the press operation member 5. The pressing portion 33 of the loosening prevention member 3 is inserted into the hole 38.
Is coordinated. Then, the pressing operation member 5 is placed on the fixed object H, and the nut 1 main body 2 is screwed into the bolt 100 and is rotated. The pressing operation member 5 is fitted and inserted, and the pressing portion 33 of the loosening prevention member 3 contacts the upper surface of the pressing operation member 5.
When the nut 1 main body 2 is further rotated from this state, as shown in FIG.
And presses the pressing portion 33 of the loosening prevention member 3 upward.
As a result, similarly to the above, the resistance applying portions 34... 34 apply an elastic force to the male screw 101 of the bolt 100. In a case where the pressing portion 33 is directly contacted with the fixed object H and pressed as in the above embodiment, after the pressing portion 33 contacts the fixed object H, the seating surface 23 of the nut body 2 is fixed. Until the pressing portion 33 contacts the object H, the pressing portion 33 rotates together with the rotation of the nut body 2 and slides on the upper surface of the fixed object H, so that the pressing portion 33 has a sliding scratch on the upper surface of the fixed object H. However, if the pressing portion 33 is pressed through such a ring-shaped pressing operation member 5, the upper surface of the pressing operation member 5 is scratched by the pressing portion 33, and the upper surface of the fixed object H is pressed. It is possible to prevent the sliding damage of the portion 33.

In this embodiment, spot welding is used as a means for attaching the loosening prevention member 3 to the nut body 2. However, the present invention is not limited to the form using the welding means. As shown in FIG. 7, a part of the nut body 2 may be caulked to attach the loosening prevention member 3, and may be changed as appropriate. In the present embodiment,
With the loosening prevention member 3 and the nut main body 2 attached and fixed, when the nut main body 2 is screwed into the bolt 100, the resistance applying portions 34... 34 are inserted into the screw groove 102 of the male screw 101 of the bolt 100 and the male screw 101. Are inserted sequentially with a gap between them so that they do not contact the
... 34 is a screw groove 102 of a male screw 101 of a bolt 100
Alternatively, it may be inserted while abutting on the male screw 101. When the nut is inserted into the male screw 101 while being in contact with the male screw 101, it is preferable that the nut body 2 is abutted against the male screw 101 so as not to deform the resistance applying portions 34. Resistance applying section 34
.. 34 are of such a degree that they do not deform.
Thus, it is possible to prevent the rotation resistance from being hardly applied to the bolt 100, thereby making it difficult to rotate the nut body 2 with respect to the bolt 100. However, even in this case, since the resistance is applied due to the contact between the resistance applying portions 34... 34 and the male screw 101, the resistance applying portions 34. , Male screw 1
When the nut body 2 is screwed into the bolt 100 in order to prevent the bolt 100 from coming into contact with the bolt 100, no rotational resistance is applied to the bolt 100 from the resistance applying portions 34. preferable.

In this embodiment, each of the resistance applying portions 34... 34 of the loosening prevention member 3 is evenly projected radially inward from the nut main body mounting portion 31 in the circumferential direction so that the distance from the nut main body mounting portion 31 is increased. 8, for example, as shown in FIG. 8, each of the resistance applying portions 34... 34 is formed in a counterclockwise circumferential direction on the front side in the loosening direction (Y direction in the drawing) of the nut body 2 with respect to the bolt 100. The amount of protrusion from the nut body attachment portion 31 to the radially inward side is sequentially increased at one end side of the nut body 2 so that the counterclockwise movement of the nut body 2 in the circumferential direction of the resistance applying portions 34. A long portion 34a having a long distance V1 from the nut main body attachment portion 31 is formed at one end on the direction side, and a clockwise side in the circumferential direction which is the tightening direction side (X direction in the drawing) of the nut main body 2 with respect to the bolt 100. At the other end, from the long part 34a By reducing the amount of projection of the inner direction may be formed a short end 34b of the distance V2 from the nut body mounting portion 31. By doing so, when the loosening prevention member 3 fixed to the nut main body 2 rotates together with the rotation operation of the bolt 100 of the nut main body 2 in the clockwise tightening direction shown in the figure, the pressing unit 33 is pressed. When the loosening prevention member 3 is deformed, the resistance imparting portion 34 is sequentially contacted with the male screw 101 of the bolt 100 from the long portion 34a side to be elastically deformed and easily elastically deformed. The elastic force can be applied to. In addition, the long portion 34 a is the bolt 10 of the nut body 2.
0, and is located on the front side with respect to the direction in which the nut body 2 is loosened with respect to the bolt 100. Therefore, the rotational resistance applied to the bolt 100 from the resistance applying portion 34 is limited to the nut body 2 The rotation of the nut body 2 in the tightening direction of the bolt 100 is larger than the rotation of the nut body 2 in the tightening direction of the bolt 100. Accordingly, when the nut body 2 is operated in the tightening direction with respect to the bolt 100, the rotation operation can be performed with a small rotation resistance, and the rotation operation of the nut body 2 can be easily performed. Is fixed, a large rotational resistance is applied to the side of the nut body 2 in the loosening direction with respect to the bolt 100, and the bolt 1 of the nut body 2
00 can be prevented from loosening.

The pressing portion 33 of the loosening prevention member 3 is not limited to the one formed by bending and projecting downward.
For example, as shown in FIG. 9, the elastic pieces 32 b and 32 c are bent from the nut main body attaching portion 31 and extend straight obliquely downward, and a portion outside the diameter of the elastic pieces 32 b and 32 c is used as a pressing portion 33. By pressing the protrusions 51 provided on the upper surface of the pressing operation member 5 to deform the elastic pieces 32b and 32c, the resistance applying portion 34 formed on the distal end side of the elastic pieces 32b and 32c is attached to the male screw 101 of the bolt 100. You may make it contact and apply an elastic force.

Further, the resistance applying portion 34 of the loosening prevention member 3
Is not limited to a configuration in which the valley 104 of the male screw 101 of the bolt 100 and the slope of the screw thread 103 are pressed, and as shown in FIG.
May be pressed. However, in this case, the rotation resistance by the resistance applying portion 34 is smaller than when the valley 104 of the male screw 101 and the slope of the screw thread 103 of the bolt 100 are pressed. It is more advantageous to press the valley 104 of the male screw 101 and the slope of the thread 103.

In this embodiment, when the bolts 100 and the nut body 2 are screwed together with the resistance applying portions 34... 34 of the loosening prevention member 3, the male members of the bolt 100 are not pressed. Although it does not abut against the screw 101, the present invention is not limited to this form, and the resistance applying portions 34.
4 may slightly contact the male screw 101 of the bolt 100. Also in this case, since the resistance applying portions 34... 34 rotate with the nut main body 2 along the leads of the male screw 101 of the bolt 100, the nut main body 2 can be rotated with a small rotational resistance with respect to the bolt 100.

On the other hand, in this embodiment, three elastic pieces 32
a, 32b, and 32c.
The numbers of a, 32b, and 32c are not particularly limited. or,
The elastic pieces 32a, 32b, and 32c are not limited to those arranged side by side at a predetermined interval.
2a, 32b, and 32c are separated, and elastic pieces 32a, 32
b and 32c may be juxtaposed so that there is almost no space between them, and can be changed as appropriate.

In this embodiment, the resistance applying portions 34... 34 of the loosening prevention member 3 are formed for the right-handed screw and formed in a spiral shape along the lead of the right-handed screw. In that case, the resistance applying sections 34... 34
May be formed in a spiral shape along the lead of the left-hand thread.

On the other hand, the bolt 100 for screwing the nut 1 of the present invention can be used not only for the one having the head 110 but also for one having a male screw, for example, an anchor bolt.

[0036]

As described above, according to the present invention, the resistance applying portion 34 does not press the male screw 101 of the bolt 100 screwed to the nut body 2 only by screwing the nut body 2 to the bolt 100. , Nut body 2 for bolt 100
Can be easily rotated. On the other hand, bolt 100
When the fixing object H is fixed between the nut body 2 and the nut body 2, the loosening prevention member 3 is forcibly deformed by the pressing portion 33, and the male screw 101 of the bolt 100 screwed to the nut body 2 by the resistance applying portion 34. , A large rotational resistance can be applied to the bolt 100, and the nut body 2 and the bolt 10
0 can be reliably prevented from loosening.

According to the fifth invention of the present application, the pressing operation member 5 is arranged between the pressing portion 33 of the loosening prevention member 3 and the object H, so that the loosening prevention member 3 is provided on the upper surface of the pressing operation member 5. Can be brought into contact with and pressed by the pressing portion 33, thereby preventing the pressing portion 33 from being scratched on the upper surface of the object H.

According to a sixth aspect of the present invention, the resistance applying section 34
By forming the bolt 100 in a spiral shape along the lead of the male screw 101, even if the nut main body 2 is screwed and rotated with the bolt 100, the resistance applying portion 34 can be connected to the bolt 10.
The nut 100 can be rotated along the 0 male screw 101, and the rotation operation of the nut body 2 with respect to the bolt 100 can be performed smoothly.

According to a seventh aspect of the present invention, the resistance applying section 34
Pressing is performed by gradually increasing the amount of protrusion in the radially inward direction from one end in the circumferential direction, which is the front side with respect to the tightening direction of the nut body 2 with respect to the bolt 100, from the other end. When the loosening prevention member 3 is deformed due to the pressing of the portion 33, the bolts 10 are sequentially arranged from the other end of each resistance applying portion 34.
The male screw 101 of the bolt 100 can be elastically deformed by being brought into contact with the male screw 101 and easily elastically deformed. Further, when the nut body 2 is operated in the tightening direction with respect to the bolt 100, the rotation operation can be performed with a small rotation resistance and the rotation operation of the nut body 2 can be easily performed. After the fixation, a large rotational resistance is applied to the nut body 2 in the loosening direction side with respect to the bolt 100, and the loosening of the nut body 2 with respect to the bolt 100 can be reliably prevented.

According to an eighth aspect of the present invention, when the nut body 2 and the bolt 100 are screwed together, the nut body 2 is
The rotation operation can be performed with almost no rotation resistance, and the rotation operation of the nut body 2 can be easily performed. On the other hand, nut body 2 and bolt 10
After the fixing object H is fixed at 0, the resistance applying portion 34 comes into contact with the male screw 101 of the bolt 100 and presses it to
A resistance is applied to 00, and loosening of the nut body 2 with respect to the bolt 100 can be reliably prevented.

[Brief description of the drawings]

FIG. 1 is a sectional view of an embodiment of a nut according to the present invention.

FIG. 2 is a plan view of a loosening prevention member.

FIG. 3A is a sectional view taken along line III-III in FIG. 2;
FIG. 4B is a sectional view taken along line IV-IV of FIG.

FIG. 4 is a sectional view showing a state where the nut of the present invention is screwed into a bolt.

FIG. 5 is a cross-sectional view of a state in which a nut is tightened to fix an object to be fixed with a bolt and a nut.

FIG. 6 is a sectional view of a state where a nut according to another embodiment is screwed into a bolt.

FIG. 7 is a cross-sectional view showing a state in which a nut is tightened to fix an object to be fixed with a bolt and a nut according to another embodiment.

FIG. 8 is a plan view of another embodiment of a loosening prevention member.

FIG. 9 is a cross-sectional view of a state in which a loosening prevention member according to still another embodiment is attached to a nut body and screwed to a bolt.

10 (A) is a plan view of a conventional nut, and FIG. 10 (B) is a cross-sectional view taken along line II of FIG. 10 (A).

FIG. 11 is a sectional view showing a state in which a conventional nut is screwed into a bolt.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Nut 2 Nut main body 3 Loose prevention member 32a, 32b, 32c Elastic piece 33 Pressing part 34 Resistance applying part 100 Bolt

Claims (8)

[Claims] 1. A nut body (2) and an elastic plate-shaped loosening prevention member (3). The nut body (2) has a female screw (21).
Is the male screw of the bolt (100) from the lower side of the nut body (2).
(101) is screwed and tightened, so that the object (H) can be fixed with the nut body (2) and the bolt (100) below the nut body (2) to prevent loosening. Inside the diameter of the member (3), a bolt (100) is provided with a resistance applying section (34) for applying rotational resistance to the nut body (2), and the resistance applying section (34) is provided on the female part of the nut body (2). screw
(21), the loosening prevention member (3) is further provided with a pressing portion (33), and the pressing portion (33) is fixed by the bolt (100) and the nut body (2). When the fixing object (H) is pressed from the fixing object (H) when fixing the fixing object (H), the resistance applying part (34) is screwed into the nut (2) with the male screw (101) of the bolt (100). ), And the resistance causes the resistance applying section (34) to be attached to the bolt (100) by the nut body (2).
A nut characterized by imparting rotational resistance to the nut. 2. A nut body (2) and an elastic plate-shaped loosening prevention member (3). The nut body (2) has a female screw (21).
Is the male screw of the bolt (100) from the lower side of the nut body (2).
(101) is screwed and tightened, so that the object (H) can be fixed with the nut body (2) and the bolt (100) below the nut body (2) to prevent loosening. Inside the member (3), a bolt (100) is provided with a resistance applying portion (34) for applying rotational resistance to the nut body (2) .On the outside of the anti-loosening member (3), a nut body mounting portion is provided. (31) is provided, and this nut body mounting portion (31) is mounted on the lower surface side of the nut body (2), so that the resistance applying portion (34) is formed on the female screw (21) of the nut body (2). A pressing portion (33) is provided between the resistance applying portion (34) of the loosening prevention member (3) and the nut main body mounting portion (31), and the pressing portion (33) When the fixing object (H) is fixed by the bolt (100) and the nut body (2), the loosening prevention member (3) is deformed by being pressed from the fixing object (H). By When the resistance applying section (34) presses the male screw (101) of the bolt (100) screwed into the nut body (2), the resistance applying section (34) attaches the bolt (100) to the nut body (2). A nut characterized by imparting rotational resistance to the nut. 3. A loosening prevention member (3) is formed of a disk-shaped member, and a nut body mounting portion (31) is provided on an outer peripheral side,
On the inner peripheral side, elastic pieces (32a) (32b) (32c) having elasticity extended inward in the radial direction from the nut body attaching portion (31) are provided,
The elastic pieces (32a), (32b), and (32c) have a resistance applying portion (34) on the distal end side, and a pressing portion (33) on the radial outside of the resistance applying portion (34).
The nut according to claim 1 or 2, wherein the nut is provided. 4. An object to be fixed (H) is provided on the lower surface of the nut body (2).
The nut body (2) is provided with a seating surface (23) that comes into contact with the nut body (2), and the pressing portion (33) of the loosening prevention member (3) is protruded below the seating surface (23) of the nut body (2). (2) When fixing the fixed object (H) with the bolt (100), the fixed object (H) comes into contact with the fixed object (H) and is pressed from the fixed object (H). The nut according to claim 1. The nut (1) includes a ring-shaped pressing member (5) which is formed separately from a nut body (2) to which a loosening prevention member (3) is attached. Is disposed between the pressing portion (33) of the loosening prevention member (3) and the fixed object (H), so that the nut body (2) and the bolt (100) fix the fixed object (H). When fixing the pressing member (33), the pressing operation member
The nut according to any one of claims 1 to 3, wherein the nut is pressed from an object to be fixed via (5). 6. A bolt (100) having a resistance applying portion (34) formed of a male screw.
The nut according to any one of claims 1 to 5, wherein the nut is formed in a spiral shape along the lead of (101). 7. A resistance applying portion (34) is gradually moved radially inward from one end in the circumferential direction, which is the front side with respect to the tightening direction of the nut body (2) with respect to the bolt (100), from the other end. The nut according to any one of claims 1 to 6, wherein the nut is formed so as to increase a protrusion amount of the nut. 8. An inner diameter of the resistance applying portion (34) is equal to a bolt (100).
Larger than the root diameter (R3) of the male screw (101) and the bolt (1
00) is formed smaller than the thread diameter (R3) of the male screw (101), and when the nut body (2) is screwed into the bolt (100),
The resistance applying part (34) can enter the screw groove (103) of the male screw (101) of the bolt (100), and the fixed object (H) is fixed with the nut body (2) and the bolt (100). When the pressing part (33) is pressed, the resistance applying part (34) is turned into the male screw of the bolt (100).
The nut according to any one of claims 1 to 7, wherein the nut is brought into contact with and pressed against (101).