JPS5919710A - Fastener for locking - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to a locking fastener.

Conventionally, in the case of a male thread, a fastener for locking has a vertical keyway in the effective thread of the bolt, and a conical shape with a protrusion that fits into the keyway of the bold. A washer is provided on the back side of the washer to prevent slippage. After fitting the washer into the pole 1- and tightening a separately prepared hexagonal nut, the conical part of the washer is inserted with a tool such as a chisel. Some nuts are crushed toward the center of the hole to prevent the nut from rotating.

In the case of a female thread, a disc-shaped spring steel piece with a tongue piece having an inner diameter approximately equal to the inner diameter of the female thread is integrally provided on the end face of the nut, and the repulsion of the spring steel piece is Some bolts generate surface pressure and create friction on the contact surface between the bolt and the nut to prevent loosening.

All of these have disadvantages in that they are bulky and expensive, and lack reliable locking effects.

The present invention has been made to eliminate the above-mentioned drawbacks.
To provide a locking fastener which is less expensive, less bulky, and which can reliably exhibit the locking effect.

Hereinafter, one embodiment of the present invention will be described in detail based on the drawings.

The figures show one embodiment of the present invention, and FIGS.
The figure is a diagram showing an example applied to a hexagonal bold, and Figures 3, 4, and 5 are diagrams showing an example applied to a hexagonal nut.
FIGS. 6 to 11 are diagrams showing other embodiments.

Hereinafter, the application to the hexagonal hole shown in FIG. 1 will be described in detail.

In the figure, the notch (2) has a substantially oval cross-sectional shape in the longitudinal direction of the threaded portion, and the depth of the notch in the axial direction is approximately equal to the root of the thread. Further, the length of the notch (2) formed in the vertical direction of the threaded portion may be the length of one thread of the thread, or may be the length of a plurality of threads. In addition, it may be formed at the tip of the threaded part, it may be formed at the threaded part in the middle, it may be formed at the rear end of the thread, and it can be formed over the entire length of the thread. It's good to wear.

The sphere (7) attached to the notch (2) has a diameter that is approximately the same as the diameter of the circle inscribed in the triangle formed by the side of the crest of the male thread and the depth of the notch (2). A sphere may be used, and the size of the sphere (7) may be appropriately determined depending on the depth of the notch (2) to be formed.

The position where the sphere (7) is attached to the notch (2) is close to the screw thread side of a part of the corner (maximum depth position) of the notch (2), and is integrally attached with an adhesive. It is set up and configured. The adhesive does not need to have strong adhesive properties; rather, it is preferable that the adhesive does not fall off easily. That is, when screwed together with the female screw, the sphere (7) comes into contact with the wall of the valley of the female screw, creating frictional resistance and separating from the adhesive, and thereafter, as the screw rotates, the sphere (7) ) slides in close contact with the surface of the notch and the wall of the valley of the female thread, so the sphere (7) is held in place by wrapping it with hardening grease or tape used for sealing, for example. However, it is not limited to adhesives.

The present invention configured as described above can be used in a normal manner, or, in the case of the hexagonal bold described above, it is sufficient to screw the hole into the female thread until it reaches a predetermined position. . At this time, the 73 sphere (7) attached to the notch (2) has a diameter of a circle approximately inscribed in the side of the threaded thread, as described above, so the screw There is no problem with fitting, and it is easily screwed together.

If there is a concern about the dimensional accuracy or error of the male and female threads, the depth of the notch (2) described above or the diameter of the attached sphere (7) may be selected. Preferably, it is desirable to attach a sphere having a diameter slightly larger than the diameter of a circle inscribed in the triangle formed by the side of the thread and the depth of the notch. In this case, the screwing force for screwing becomes extremely large; or rather, in this case, the sphere can be easily separated from the adhesive, creating a state in which the sphere can slide freely, and the male thread Produces a good result in which the female screws are tightly screwed together.

If the bolt screwed together in this way is subjected to a force that tries to rotate in the opposite direction (a force that tries to loosen the screw or loosen it), the ball (7) mentioned above will automatically connect the screw and the female screw. It is in a biting state and acts as a wedge, preventing the bold itself from rotating in the opposite direction.

That is, when the notches (2) formed in the bold are screwed together, they form a triangular shape with the - side being a gentle arc, forming a wedge-like shape, so that they will rotate in the opposite direction. Even if such force and action are applied, the sphere attached to the notch will not be able to slide, and therefore the detent and loosening effect will be strong and sufficient.

As described in detail above, the present invention exhibits an ideal locking effect, but if you intentionally try to reverse the rotation of the bolt, one of the male or female threads, or Both threads will be crushed, but not only will the threads be crushed, but the attached sphere 73 will further dig into the threads, and in some cases, the thread body itself may break. However, it goes without saying that the above-mentioned untwisting force requires an extremely large force.

Next, an example of application to a bold case where the cross-sectional shape of the notch (2) is approximately W-shaped will be described (see FIG. 2).

This embodiment not only has the effect of preventing loosening, but also allows reverse rotation if necessary, and also makes it possible to separate it from the cage. The notch (2) has a substantially W-shaped cross-sectional shape, and when a reverse rotation force of more than a predetermined value is applied, the sphere (7) or the W-shaped peak is crushed and climbed over the peak, and the W-shaped part on the opposite side is crushed. It is rolled and accommodated in the valley (position (7')). Therefore, at this point, reverse rotation of the bold is easily possible and the hole can be removed. The height of the W-shaped peak for reverse rotation or to prevent loosening is selected arbitrarily, and as mentioned above, the depth of the valley of the W on the opposite side (position (7')) is also selected as a matter of course. Of course, it is deeper than the diameter of the sphere (7).

In addition, when reusing the ball, it is possible to reuse it by attaching the sphere to the notch in a position other than the position where it was first attached, close to the thread.

Next, an example in which the cross-sectional shape of the notch (2) is approximately U-shaped will be described (see FIG. 5).

Similar to the above-mentioned case where the cross-sectional shape of the notch is approximately W-shaped, this embodiment not only has the effect of slackening, but also allows reverse rotation if necessary, and further facilitates manufacturing and processing. This is how it was done. In other words, it is shaped like a U-shape with a straight line to facilitate the production and modification of molds such as punching tables. While crushing the pile, it climbs over the pile and rolls into the groove on the opposite side (position (7')).
As in the case described above, the nut can be easily rotated in the reverse direction at this point and can be reused.
There is C.

By the way, the method to find the diameter of the sphere (7) is as follows:
Based on the pitch of the thread, for example, if the thread is 1" thick (M) 2 x 1.75, the diameter of the sphere will be approximately 1.01χ as the standard dimension, and these can be calculated using the trigonometric formula, function value, etc. It can be easily obtained by

Furthermore, the notch can be formed at the same time as the raw material is forged and forged, and it is preferable to form the notch in a step before forming the screw.

Furthermore, the material of the rough assener of the present invention is not limited to the sphere, regardless of whether it is made of metal, non-metal, synthetic resin, or the like.

In addition, it is possible to freely change the hardness of the male thread and the female thread so that only one of them can be replaced.

As described above in detail, the present invention is characterized in that a notch is formed in the longitudinal direction of the wedge part and a sphere is attached to the notch, or the above-mentioned notch ( 2) may be provided in the middle of the entire length of the screw, or may be provided only at the tip of the screw (see FIGS. 6 and 7).

Furthermore, the number of the notches is not limited to just one, but it is also possible to have a plurality of grooves (see Figure 8.9.10), and the number of attached spheres is also limited to one. Good too.

Furthermore, the notch is not limited to being parallel to the axis; it may also be formed with a slope (see FIG. 11).

As described in detail above, although the present invention has an extremely simple configuration, it is possible to obtain a reliable effect of preventing loosening.The effects will be listed below.

■ It is now possible to securely prevent loosening.

(2) It can also be removed depending on the shape of the notch.

■ Applicable to all screw fasteners.

■ After fastening, it is not visible from the outside and does not damage the appearance.

■ The notch can be easily formed using a press, a sawmill, etc.

■ Leads to savings in materials and transportation costs due to reduced weight.

Therefore, the present invention can be used not only for mechanical assemblies, vehicles, bridges, and architectural structures, but also for semi-permanent fastening and complete fastening. It can be used in a variety of fields, and its practical value in industry is extremely great.

[Brief explanation of drawings]

The figures show one embodiment of the present invention. Fig. 1 shows an example in which a single line of abbreviated notches is formed in a hexagonal bold, A is a front view, 13 is a cross-sectional end view of the main part, and Fig. 2 is An example is shown in which a single approximately W-shaped notch is formed in a hexagonal nut, A is a front view, B is a cross-sectional end view of the main part, and Figure 3 is a hexagonal nut in which a single approximately W-shaped notch is formed. An example is shown, A is a cross-sectional view, B is a cross-sectional end view of the main part in the longitudinal direction of A, FIG. 4 shows an example where a substantially W-shaped notch is formed in a hexagonal nut, A is a cross-sectional explanatory view, B is an explanatory view of the longitudinal cross-sectional end surface of A. FIG. Figure 6 is a front view showing an example in which a hexagonal nut is provided with a single rectangular notch in the middle of the entire length of the screw, and Figure 7 is a hexagonal nut with a single rectangular notch formed in the middle of the entire length of the screw. 8, 9, and 10 are explanatory diagrams of the threaded portion showing an example in which multiple notches are formed at the tip. FIG. FIG. 3 is a front view showing an example in which a notch is formed with a slope. ■... Threaded part, 2... Notch, 3 - Top of the thread, 4 - Bottom of the thread, 5... Top of the thread, 6 Bottom of the thread, 7.7' ··sphere. Patent Applicant: Sato Ryohei No.A No. 3 No. 4 No. 4 No. 5 No. 8 No. 9

Claims (1)

[Claims]! A loosening fastener 2 characterized in that a notch is formed in the longitudinal direction of a threaded part and a sphere is attached to the notch. The locking fastener 3 according to claim 1, in which the cutout has a substantially W-shaped cross section.The locking fastener 4 according to claim 1, in which the cutout has a substantially U-shaped cross-section Loosening fastener 5 according to claim 11. Claim 1, wherein the fastener is a screw having an external thread.
The locking fastener 6 according to claims 1 to 3. The locking fastener 6 according to claims 1 to 4, wherein the fastener is a screw having a female thread.