JPH0445690B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a locking screw that does not loosen even when subjected to vibration or rotation.

<Conventional technology> Bolts (or screws) and nuts are generally used in combination to secure fastened materials such as multiple plates or pipes, but this method prevents vibration and rotation. In places where there is a lot of water, there is a problem that even if the nut is tightened quite firmly, the nut will naturally loosen over a long period of time, and the nut will no longer function properly, or there is a risk that this will occur.

Therefore, in order to prevent the nut from loosening, conventional methods have been used to prevent the nut from loosening, such as hitting the tip of the bolt after tightening the nut to make this part thicker, as shown in Figure 4. After screwing the nut 2 onto the bolt 1, a pin 3 is inserted into the hole at the tip of the bolt 1 to fix the nut 2, as shown in FIG. A means for fitting and fixing the cap 4 has been implemented.

<Problems to be Solved by the Invention> However, while the above-mentioned conventional technology allows nuts etc. to be fixed by a predetermined means, the nuts etc. are fixed almost permanently to the bolt, so it is difficult to fix the nuts etc. many times. It was also difficult to repeatedly attach and detach the device.

Once a nut, etc. has been fixed to a bolt during a movement, if the fixed material to be tightened becomes thin due to wear or dryness and becomes loose, the nut cannot be further tightened, so make adjustments. There were problems such as difficulty in

The present invention relates to a completely new technique developed in view of these conventional problems.

<Means for Solving the Problems> The present invention fundamentally improves the above-mentioned conventional problems. a cylindrical body having a cylindrical body at its tip end having a first threaded member provided thereon, and an inner circumferential surface provided with a thread that can be screwed into the thread on the outer circumferential surface of the first threaded member; a second threaded member having a through hole bored therein with a thread having the same diameter and direction as the inner periphery of the first threaded member; and a through hole between the thread on the inner periphery of the first threaded member and the second threaded member. and a third screw having screws on the outer circumferential surface that can be screwed into the screws of the
A screw in which the third screw member is screwed into the second screw member and the first screw member with respect to the direction or pitch of the screw in which the first screw member is screwed into the second screw member. The directions or pitches of the images are different.

<Operation> In the present invention, as described above, the first screw member and the second screw member are screwed together, and the third screw member is screwed to the first screw member and the second screw member. With this structure, these screw members can be strongly connected to each other, and thereby the screws can be prevented from loosening.

In the present invention, as described above, the third screw member is screwed into the second screw member and the first screw member with respect to the direction or pitch of the screw where the first screw member is screwed into the second screw member. Since the screws are configured to have different directions or pitches, the connection between these three screw members can be made stronger and the screws can be prevented from loosening due to vibration or the like.

<Example> An example of the locking screw according to the present invention will be specifically explained with reference to the drawings. In FIGS. 1 and 2, 5 is a first screw member, and the tip thereof has a A cylindrical body 6 having a predetermined inner diameter and outer diameter is provided,
Further, screws 5a and 5b are provided on the outer circumferential surface and the inner circumferential surface of this cylindrical body 6, respectively.

Next, reference numeral 7 denotes a second screw member, which has a cylindrical body 8 at its tip end having an inner diameter approximately equal to the outer diameter of the cylindrical body 6 of the first screw member 5, and has a cylindrical body 8 on the inner circumferential surface of the cylindrical body 8. A screw 7a that can be screwed into the screw 5a of the first screw member 5 is provided. Further, a through hole 9 having an inner diameter equal to the inner diameter of the cylinder body 6 and penetrating into the cylinder body 8 is bored in the center of the base of the second screw member 7. A screw 9a having the same diameter and direction as the screw 5b of the first screw member 5 is provided on the peripheral surface.

Furthermore, 10 is a third screw member, which includes the cylinder body 6 of the first screw member 5 and the through hole 9 of the second screw member 7.
A screw 10a is provided on the outer circumferential surface of the screw 10a and has an outer diameter that can be inserted into each of the screws 5b and 9a of the first screw member 5 and the second screw member 7, respectively.

When assembling and using the locking screw according to the present invention, as shown in FIG.
The first screw member 5 is inserted from one direction of the through hole 13 drilled in the hole 13, and the second screw member 7 is inserted from the other direction, so that the screw 5a of the first screw member 5 and the second screw member 7
These plate materials 1 are screwed together with the screws 7a.
1 and 12 are firmly tightened and fixed by these screw members 5 and 7.

Next, the third screw member 10 is inserted into the cylinder body 6 of the first screw member 5 through the through hole 9 of the second screw member 7, and the screw 10a of the third screw member 10 is inserted into the screw 9b of the screw members 5, 7. 5b, respectively, thereby preventing the threaded members 5 and 7 from loosening.

In the above embodiment, as shown in FIG. 3, the thread direction of the screw 5a of the first screw member 5 (right-hand thread direction) and the thread direction of the screw 10a of the third screw member 10 (left-hand thread direction) are different. It is configured with a reverse screw direction,
As a result, when the first screw member 5 or the second screw member 7 tries to rotate in a predetermined direction due to vibration or the like, this is prevented by the action of the reverse screw, and the screw members 5 and 7 It is configured to prevent the screw from loosening.

Alternatively, the screw pitch of the screw 5a (or screw 7a) of the first screw member 5 and the screw pitch of the screw 5b (or screw 9a, screw 10a) are configured to be different from each other as shown in the figure.

Therefore, due to the difference in screw pitch, the screw members 5 and 7 can be screwed together more tightly, thereby preventing them from loosening due to vibration or the like.

<Effects of the Invention> Since the locking screw according to the present invention has the structure and function as described above, by screwing the three screw members together, the locking screw interposed therebetween can be tightened. Can tighten materials strongly.

Furthermore, in the present invention, since the thread directions or pitches of the three screw members are changed as described above, the screwing of the three screw members can be made more reliable, and therefore, Even when the material to be fastened moves due to vibration, rotation, etc., the threaded connection of the screw member does not loosen and can maintain its state as it is.

[Brief explanation of the drawing]

FIG. 1 is an explanatory cross-sectional view of the locking screw of the present invention;
FIG. 2 is an explanatory diagram of parts, FIG. 3 is an explanatory diagram showing the direction of screws, and FIGS. 4 and 5 are explanatory diagrams of a conventional example. 1 is a bolt, 2 is a nut, 3 is a pin, 4 is a cap, 5, 7, 10 are screw members, 5a, 5b, 7
Numerals a, 9a and 10a are screws, 6 and 8 are cylindrical bodies, 9 is a through hole, and 11 and 12 are plate materials.

Claims (1)

[Claims] 1. A first threaded member having a cylindrical body having threads on the outer circumferential surface and an inner circumferential surface, respectively, at the tip; and an inner circumferential surface provided with a screw that can be screwed into the thread on the outer circumferential surface of the first threaded member. a second threaded member having a cylindrical body at its tip and having a threaded through hole bored in the center of the base having the same diameter and direction as the inner periphery of the first threaded member; The first screw member is combined with a third screw member having screws on the outer peripheral surface that can be screwed into the inner circumferential screw of the first screw member and the screw of the through hole of the second screw member, respectively, and the first screw member is connected to the second screw member. A loosening device characterized in that the direction or pitch of the screws of the third screw member screwed into the second screw member and the first screw member is configured to be different from the direction or pitch of the screws screwed into the screw member. Set screw.