JP2527130B2 - Screw locking device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screw loosening prevention device capable of preventing loosening of screw members such as bolts, nuts and tacks after tightening.

[0002]

2. Description of the Related Art Conventionally, as a screw loosening prevention device,
Application for utility model registration No. 54774 published in 1987 (hereinafter referred to as Device 1), application for utility model registration No. 895 for 1987
There was a device (hereinafter referred to as device 2) published in Japanese Patent No. 15 publication.

Of these, Device 1 is as shown in FIG.
Device 2 has a head B of a screw member A as shown in FIG.
A washer D is attached to the back surface C side of the head portion B, and a serrated head projection E is formed on the back surface C of the head portion B as a slope having an upward slope toward the rotation direction (direction of arrow a in the figure) when tightening the screw. The washer D is provided with a saw-toothed washer protrusion F that meshes with the head protrusion E on the surface of the washer D. Both protrusions E and F are free to rotate in the tightening direction, but rotate in mesh with each other in the opposite direction. Is regulated to prevent the screw member A from loosening.

In Invention 1, the washer D as shown in FIG.
On the right half of the center line XX on the back surface of the washer, there is provided a biting protrusion H that bites into the object to be tightened G when the washer D is tightened by the screw member A. A loosening stop projection I is provided to regulate and prevent the loosening.

In the above-mentioned device 2, as shown in FIG. 10 (b), on the back surface of the washer D, the biting protrusion H that bites into the mounting material G when the washer D is tightened by the screw member A and the washer D in the opposite direction. Plural pairs are provided as a pair, which are adjacently provided with a loosening protrusion I that regulates the rotation and prevents the loosening.

[0006]

In the loosening prevention device of the above inventions 1 and 2, the back surface C of the head B of the screw member A has a saw-tooth shape with a slope inclined upward in the direction of rotation when tightening the screw. Since the head projection E is formed and the saw-toothed washer projection F that meshes with the head projection E is formed on the surface of the washer D, once the both are tightened, the vertical surfaces of both projections E and F are mutually Although the screw member A is prevented from loosening by meshing with each other, since a large number of protrusions having a complicated shape must be formed in each of the head B and the washer D of the screw member A, there is a problem that the manufacturing cost becomes high. is there. In this locking device, since the vertical surfaces of the protrusions E and F are engaged with each other as described above, the head B of the screw member A is rotated and then the screw member A is removed from the mounting member G after tightening. In this case, if the projections E and F that are meshed with each other are forcibly released from the engagement, the projections E and F may be damaged, and there is a problem that they cannot be used repeatedly.

An object of the present invention is to provide a screw locking device which has a simple structure, is easy to assemble, and is inexpensive to manufacture.

[0008]

As shown in FIGS. 1 to 5, a screw locking device according to claim 1 of the present invention includes a screw member 1 such as a bolt and a nut, and a back surface side of a head portion 2 thereof. And a washer 3 arranged on the back surface of the head 2, and a head projection 4 is abutted on the back surface of the head 2 along the circumferential direction thereof. In a screw loosening preventive device in which a meshable washer protrusion 5 is abutted and a biting protrusion 6 is provided along the circumferential direction of the back surface of the washer 3, the washer protrusion 5 has an obtuse angle with respect to the head protrusion 4. It is characterized in that it is formed in a chevron shape and is projected at a ratio of one to several head projections 4.

According to a second aspect of the present invention, as shown in FIG. 7, in the screw loosening prevention device, the washer protrusion 5 has a tightening slope 10 on the front side in the tightening direction, and a tightening slope on the front side in the tightening direction. It is characterized in that it is formed on a slope gentler than 11.

According to a third aspect of the present invention, in the screw loosening prevention device, the biting protrusion 6 on the back surface of the washer 3 is formed in an obtuse angled shape with respect to the head protrusion 4, and with respect to several head protrusions 4. It is characterized in that it is formed by projecting at a ratio of one piece.

As shown in FIG. 7, the screw locking device according to claim 4 of the present invention, as shown in FIG.
Among these, the tightening slope 14 on the front side in the tightening direction is formed to be more gentle than the loosening slope 15 on the front side in the tightening direction.

As shown in FIG. 6, a screw locking device according to a fifth aspect of the present invention comprises a screw member 1 such as a bolt and a nut, and a washer 3 arranged on the back side of a head portion 2 thereof. Then, the head projection 4 is abutted along the circumferential direction of the back surface of the head 2, and the washer projection 5 capable of meshing with the head projection 4 is projected along the circumferential direction of the surface of the washer 3. In a screw loosening prevention device which is in contact with and has a biting projection 6 protruding along the circumferential direction of the back surface of the washer 3, the head projection 4 is formed into an obtuse angle mountain shape than the washer projection 5, and several It is characterized in that it is provided in a ratio of one with respect to the washer protrusion 5.

According to a sixth aspect of the present invention, as shown in FIG. 8, the screw loosening prevention device has a tightening slope 12 on the front side in the tightening direction of the head projection 4 and a loosening slope 13 on the rear side in the tightening direction. It is characterized in that it is formed on a gentler slope.

As shown in FIG. 8, a screw locking device according to a seventh aspect of the present invention is a biting projection 6 on the back surface of the washer 3.
Is formed in a mountain shape having an acute angle with respect to the head projection 4 and is provided at a ratio of several to one head projection 4.

[0015]

In the screw locking device according to the first aspect of the present invention, since the washer protrusion 5 is formed in an angular shape with an obtuse angle than the head protrusion 4, the head 2 of the screw member 1 is rotated to rotate the screw member. When 1 is tightened on the tightening target 15, the washer protrusion 5
Is engaged in a valley between two head projections 4 adjacent to each other, and the two head projections 4 are pushed outward to bite into the valley. As a result, the resistance of the screw member 1 in the rotating direction is increased, and the screw member 1 is less likely to loosen. Further, since the washer protrusions 5 are provided at a ratio of one to several head protrusions 4, when the screw member 1 is tightened, the frictional resistance between the washer protrusions 5 and the head protrusions 4 is too large. It is easy to tighten. Further, the washer protrusion 5
As for the close contact between the head projection 4 and the head projection 4, the washer projection 5 further penetrates into the valley when vibration is applied after tightening, so that the washer projection 5 and the head projection 4 are locked more firmly, and the vibration is intense. Even if it is attached to the tightening target 15, the screw does not loosen.

In the screw loosening prevention device according to the second aspect of the present invention, the tightening slope 10 on the front side in the tightening direction of the washer protrusion 5 is formed to be more gentle than the lock slope 11 on the front side in the tightening direction. Therefore, the frictional resistance at the time of tightening the screw is small, and the frictional resistance at the time of loosening the screw is large, so that the screw is easily tightened and is not easily loosened. Further, since the slope of the tightening slope 10 of the washer protrusion 5 is gentle, noise generated by friction between the slope 10 and the head protrusion 4 during tightening becomes gentle (quiet).

In the screw loosening prevention device according to claim 3 of the present invention, the biting protrusion 6 on the back surface of the washer 3 is formed in an obtuse angled angle with respect to the head protrusion 4, and with respect to several head protrusions 4. 1
Even if the washer 3 is turned upside down, the biting protrusion 6 is the same as the washer protrusion 5 because the protrusions are provided at a ratio of 4 pieces.
Therefore, when the washer 3 is attached to the screw member 1, it is not necessary to care about the front and back of the washer 3, and the assembly is simplified.

According to a fourth aspect of the present invention, in the loosening preventive device of the present invention, of the biting projections 6 on the back surface of the washer 3, the tightening slope 14 on the front side in the tightening direction is gentler than the locking slope 15 on the front side in the tightening direction. Washer 3 because it is formed on the slope
When the reverse side is reversed, the biting protrusion 6 is engaged with the head protrusion 4 similarly to the washer protrusion 5 of claim 2, so that the frictional resistance when tightening the screw is small and the frictional resistance when loosening is large, The screws are easy to tighten and difficult to loosen.

In the screw locking device according to the fifth aspect of the present invention, since the head projection 4 is formed in an angular shape with an obtuse angle than the washer projection 5, the head 2 of the screw member 1 is rotated to rotate the screw member 1. When 1 is tightened to the tightening target 15, the tip of the head projection 4 is locked in a valley between two adjacent washer projections 5, and the two washer projections 5 are pushed outward to spread the valley. Bite into. As a result, the resistance of the screw member 1 in the rotating direction is increased, and the screw member 1 is less likely to loosen. In addition, since the head projection 4 is provided so as to project to one of several washer projections 5, when the screw member 1 is tightened, the frictional resistance between the head projection 4 and the washer projection 5 is too large. It is easy to tighten. Further, the head projection 4
The tight contact between the washer protrusion 5 and the washer protrusion 5 makes the head protrusion 4 further penetrate into the valley when vibration is applied after tightening, so that the head protrusion 4 and the washer protrusion 5 are locked more firmly, and the vibration is intense. Even if it is attached to the tightening target 15, the screw does not loosen.

According to the sixth aspect of the present invention, in the screw loosening prevention device, the tightening slope 12 on the front side in the tightening direction of the head projection 4 is formed to be more gentle than the loosening slope 13 on the rear side in the tightening direction. Therefore, the frictional resistance at the time of tightening the screw is small, and the frictional resistance at the time of loosening is large, so that the screw is easily tightened and is not easily loosened. Further, since the inclination of the tightening slope 12 of the head projection 4 is gentle, noise generated by friction between the slope 12 and the washer projection 5 during tightening becomes gentle (quiet).

In the screw locking device according to claim 7 of the present invention, the biting projection 6 formed on the back surface of the washer 3 is, like the washer projection 4 formed on the front surface, a chevron shape with a sharper angle than the head projection 4. Even if the washer 3 is turned upside down, the biting protrusion 6 meshes with the head protrusion 4 in the same manner as the washer protrusion 5, so that the washer 3 can be used without any problem, and when the washer 3 is attached to the screw member 1. The washer 3 does not need to care about the front and back, and the assembly is easy.

In the screw loosening preventive device of the present invention, the tightening can be loosened by applying a constant force to the head 2 of the screw member 1 in the direction opposite to the tightening direction with a spanner or an appropriate tool. In addition, if the screw member 1 is tightened again after being loosened once, the screw member 1 can be tightened as it is, and the screw member 1 is hardly loosened as it is.

[0023]

Embodiment 1 FIGS. 1 to 3 show a first embodiment of a screw locking device of the present invention, in which the screw member 1 is a bolt, and the head of the metal screw member 1 is shown. A metal washer 3 is attached to the back surface side of 2. This washer 3 is shown in Figure 3.
The screw material rod 20 before rolling the screw of the screw member 1 shown in FIG.
After loosely covering it, screw 21 (Fig. 1) on the same rod material rod 20.
By making the outer diameter of the screw 12 larger than the inner diameter of the washer 3 so as not to come off from the screw material rod 20, and the root portion 22 of the screw material rod 20 where the screw 12 is not cut. You can slide it up and down.

On the back surface of the head 2 of the screw member 1, as shown in FIG.
As shown in FIG. 2, a chevron-shaped head projection 4 is formed along the circumferential direction.
Are projected continuously. Each head protrusion 4 is an isosceles triangle in which the tightening slope 13 on the rear side in the tightening direction (arrow direction in FIGS. 1 and 2) and the loosening slope 12 on the front side in the tightening direction have the same inclination angle. The angle θ of the projection tip of the head projection 4 is set to 60 degrees.

On the surface of the washer 3, three angled washer protrusions 5 having an obtuse angle with the head protrusion 4 are provided along the circumference of the washer 3 at regular intervals (every 120 degrees). There is.
Each washer protrusion 5 is an isosceles triangle in which the tightening slope 10 on the front side in the tightening direction and the loosening slope 11 on the front side in the tightening direction have the same inclination angle, and the angle φ of the protrusion tip of the washer protrusion 5 is set. Is larger than 60 degrees of the head projection 4 by 90 degrees. The washer protrusion 5 is hardened to increase its hardness so that the head protrusion 4 can be easily bitten, or the washer 3 is made of a material harder than the screw member 1 to form the head protrusion 4.
If it is easy to bite into the body, the adhesion between the washer protrusion 5 and the head protrusion 4 is further enhanced, and the loosening prevention effect is enhanced.

Further, three biting projections 6 are provided on the back surface of the washer 3 in the circumferential direction. The biting protrusion 6 is formed in exactly the same shape and projecting position as the washer protrusion 5, and when the washer 3 is put on the screw material rod 20 before the screw of the screw member 1 shown in FIG. It can be assembled without worrying about the front and back of No. 3 (the assembling work becomes easy and the productivity is improved). The shape and the number of protrusions of the bite protrusion 6 may be different from those of the washer protrusion 5, but in that case, when the washer 3 is attached to the screw member 1, it is necessary to check the front and back of the washer 3 for assembly. Be troublesome.

[0027]

Second Embodiment The embodiment shown in FIG. 4 is a case where the screw member 1 is a nut. Also in this case, the head 2 of the metallic screw member 1
Similar to the case of FIG. 1, the metal washer 3 is caulked on the back side of the so as not to fall off.

A mountain-shaped head projection 4 is also formed on the back surface of the head 2 in FIG. 4, and the shape, the number, and the like are the same as those of the head projection 4 in FIG.

The washer 3 shown in FIG. 4 also has a washer projection 5 on its front surface and a biting projection 6 on its back surface, which are the same as the washer projection 5 and the biting projection 6 shown in FIG.

[0030]

Third Embodiment The embodiment of FIG. 5 is a case where the screw member 1 is a tack of a golf shoe. Also in this case, the washer 3 is loosely fitted to the root portion 22 of the metal screw rod 20, and the annular fitting recess 24 formed on the outer periphery of the root portion 22 is inserted into the fitting hole of the washer 3. The circumferential washer 25 is press-fitted to prevent the washer 3 from coming off.

As in the case of FIGS. 1 and 4, the head 2
A head projection 4 is formed on the back surface 3, a washer projection 5 is formed on the front surface of the washer 3, and a biting projection 6 is formed on the back surface.
The tightening target 15 in FIG. 5 is a shoe sole, and the screw rod 21 of the screw member 1 is screwed into a receiving jig 26 embedded in the tightening target 15 in advance for tightening.

[0032]

Fourth Embodiment The embodiment shown in FIG. 6 is similar to the first embodiment when the screw member 1 is a nut. Also in this case, the metal washer 3 is caulked on the back side of the head 2 of the metallic screw member 1 so as not to fall off, as in the case of FIG.

On the back surface of the head 2 of the screw member 1, chevron-shaped head projections 4 are evenly spaced (12) along the circumferential direction.
There are three protrusions at intervals of 0 degree. Each head projection 4
Is an isosceles triangle in which the tightening slope 13 on the rear side in the tightening direction (the direction of the arrow in FIG. 6) and the loosening slope 12 on the front side in the tightening direction have the same inclination angle.
The angle θ of the tip of the projection is 90 degrees.

On the surface of the washer 3, a mountain-shaped washer projection 5 having a sharper angle than the head projection 4 is continuously provided along the circumferential direction thereof. Each washer protrusion 5 is an isosceles triangle in which the tightening slope 10 on the front side in the tightening direction and the loosening slope 11 on the front side in the tightening direction have the same inclination angle, and the angle φ of the protrusion tip of the washer protrusion 5 is set. Is head projection 4 of 9
It is as small as 60 degrees with respect to 0 degrees. In this case,
The head protrusion 4 is hardened to increase the hardness and the washer protrusion 5
If the head 2 is made of a material harder than the washer 3 so that it can easily bite into the washer protrusion 5, the head protrusion 4
And the washer protrusion 5 are more closely attached, and the loosening prevention effect is enhanced.

[0035]

[Embodiment 5] In the embodiment shown in FIG. 7, a head projection 4 is formed on a head 2 of a screw member 1 and a washer is attached to the surface of a washer 3 attached to the screw member 1 as in the first embodiment. The protrusion 5 is formed, and the biting protrusion 6 is formed on the back surface.

Similar to the first embodiment, the head projection 4 is formed into an acute isosceles triangle having a tip angle θ of 60 degrees, and continuously projects along the circumferential direction of the back surface of the head 2. It is set up.

In the washer projection 5, the tightening slope 10 on the front side in the tightening direction (the direction of the arrow in FIG. 7) is formed more gently than the loosening slope 11 on the front side in the tightening direction. The angle φ ₂ of the tightening slope 10 is 45 degrees, and the angle φ ₁ of the loosening slope 11 is 35 degrees. Note that three washer protrusions 5 are provided at intervals along the circumferential direction of the surface of the washer 3.

In the biting protrusion 6, the tightening slope 14 on the front side in the tightening direction (the direction of the arrow in FIG. 7) is formed more gently than the loosening slope 15 on the front side in the tightening direction. The tightening slope 14 has an angle δ ₁ of 45 degrees, and the locking slope 15 has an angle δ ₂ of 35 degrees. The biting protrusions 6 are spaced apart from each other along the circumferential direction of the back surface of the washer 3 in the same manner as the washer protrusions 5.
One is projected.

[0039]

Sixth Embodiment In the embodiment shown in FIG. 8, a head projection 4 is formed on a head 2 of a screw member 1 as in the fourth embodiment, and a washer projection is formed on the surface of a washer 3 attached to the screw member 1. 5 is formed.

In the head projection 4, the tightening slope 12 in the front in the tightening direction (arrow direction in FIG. 8) is formed more gently than the loosening slope 13 in the rear in the tightening direction. The angle θ ₁ of the tightening slope 12 is 45 degrees, and the angle θ ₂ of the loosening slope 13 is 35 degrees. It should be noted that three head projections 4 are provided on the back surface of the head 2 at intervals along the circumferential direction.

The washer projection 5 is formed into an acute isosceles triangle having a tip angle φ of 60 degrees, and is continuously projected along the circumferential direction of the surface of the washer 3.

The biting projection 6 has a tip angle δ of 60.
It is formed in an isosceles triangle with an acute angle and is continuously projected along the circumferential direction of the back surface of the washer 3 like the washer projection 5.

In the screw loosening prevention device of the present invention,
A desired number of head projections 4 formed on the screw member 1 and washer projections 5 formed on the washer 3 can be produced, but basically, the projections formed in an acute angle are circular. A large number of protrusions are formed continuously in the direction and one obtuse angle-shaped protrusion is formed in the circumferential direction at a ratio of one to several of the acute angle protrusions.

Further, when the head projection 4 and the washer projection 5 are brought into close contact with each other by tightening the screw, the number and arrangement of the projections must be configured so that they can engage with each other.

[0045]

The loosening prevention device of the present invention has the following effects. . When the screw member 1 is rotated and tightened on the tightening target 15, the head protrusion 4 and the washer protrusion 5 are brought into complete contact with each other.
The screw member 1 is hard to loosen. . Further, since the adhesion between the head projection 4 and the washer projection 5 is increased by the vibration, the screw member 1 does not loosen and come off even when it is attached to the tightening target 15 that vibrates violently. . Further, since either one of the head protrusion 4 and the washer protrusion 5 is reduced in number, the frictional resistance when the screw member 1 is rotated and tightened is small, and the screw member 1 is easy to rotate and requires a light force. Can be tightened. Further, the noise generated when the head projection 4 and the washer projection 5 collide with each other during tightening is quiet. . Particularly, in the screw loosening prevention device according to claim 2 or claim 4 or claim 6, there is little rotational friction in the tightening direction,
Since the rotational friction in the loosening direction becomes large, the screws are easy to tighten and difficult to loosen. In addition, the sound generated when the head projection 4 and the washer projection 5 collide with each other during tightening becomes quieter. . In the screw loosening prevention device according to claim 3, 4 or 7, since the washer protrusion 5 and the biting protrusion 6 formed on the front and back surfaces of the washer 3 are the same, the front and back sides of the washer 3 should be taken care of during assembly. It is easy and quick to assemble without the need for

[Brief description of drawings]

FIG. 1 is a view showing a first embodiment of a screw locking device of the present invention, and is a side view before tightening a screw member.

FIG. 2 is a side view showing a state in which a screw member of the locking device is tightened.

3A is a side view showing a state before assembly of the screw locking device of FIG. 1, and FIG. 3B is a front view of a washer in the locking device.

FIG. 4 is a side view of a second embodiment of the screw locking device of the present invention in a partially cut state.

FIG. 5 is a side view of a third embodiment of the screw locking device of the present invention in a partially cut state.

FIG. 6 is a side view of the fourth embodiment of the screw locking device according to the present invention.

FIG. 7 is a side view of a portion of the fifth embodiment of the screw locking device of the present invention.

FIG. 8 is a partial side view of a sixth embodiment of the screw locking device according to the present invention.

9A is a side view showing an example of a conventional screw locking device, and FIG. 9B is a rear view of a washer of the screw locking device.

FIG. 10A is a side view showing another example of a conventional screw locking device, and FIG. 10B is a rear view of a washer of the screw locking device.

[Explanation of symbols]

 1 screw member 2 head 3 washer 4 head protrusion 5 washer protrusion 6 biting protrusion 10 washer protrusion tightening slope 11 washer protrusion loosening slope 12 head protrusion tightening slope 13 head protrusion loosening slope 14 biting Protrusion tightening slope 15 Biting protrusion loosening slope

Claims (7)

(57) [Claims] 1. A screw member 1 such as a bolt and a nut, and a washer 3 arranged on the back surface side of a head portion 2 thereof, and a head projection 4 is provided along the circumferential direction of the back surface of the head portion 2. Rushed,
A screw in which a washer protrusion 5 capable of meshing with the head protrusion 4 is abutted along the circumferential direction on the front surface of the washer 3 and a biting protrusion 6 is provided along the circumferential direction on the back surface of the washer 3. 2. The screw according to claim 1, wherein the washer projection 5 is formed in an obtuse angled shape with respect to the head projection 4 and is provided at a ratio of one to several head projections 4. Anti-loosening device. 2. The screw according to claim 1, wherein the tightening slope 10 of the washer projection 5 on the front side in the tightening direction is formed more gently than the loosening slope 11 on the front side in the tightening direction. Anti-loosening device. 3. The washer 3 has a biting projection 6 formed on the back surface of the washer 3 in an obtuse angled shape with respect to the head projection 4, and is provided at a ratio of one to several head projections 4. The anti-loosening device according to claim 1 or 2, characterized in that. 4. The tightening slope 14 on the front side in the tightening direction of the biting protrusion 6 on the back surface of the washer 3 is formed to be more gentle than the loosening slope 15 on the front side in the tightening direction. Locking device for 3 screws. 5. A screw member 1 such as a bolt or a nut, and a washer 3 arranged on the back surface side of a head portion 2 thereof, and a head projection 4 is provided along the circumferential direction of the back surface of the head portion 2. Rushed,
A screw in which a washer protrusion 5 capable of meshing with the head protrusion 4 is abutted along the circumferential direction on the front surface of the washer 3 and a biting protrusion 6 is provided along the circumferential direction on the back surface of the washer 3. In the anti-loosening device, the head projection 4 is formed in an obtuse angled shape with respect to the washer projection 5, and the head projection 4 is provided at a ratio of one to several washer projections 5. Locking device. 6. The screw according to claim 5, wherein the tightening slope 12 on the front side in the tightening direction of the head projection 4 is formed more gently than the loosening slope 13 on the rear side in the tightening direction. Locking device. 7. The bite protrusion 6 on the back surface of the washer 3 is formed in a mountain shape having an acute angle with respect to the head protrusion 4, and one head protrusion 4 is formed.
The anti-loosening device according to claim 5 or 6, wherein the locking device is provided so as to project at a ratio of several pieces.