KR20040063045A - bolt fastener with release preventing ring - Google Patents

Abstract

PURPOSE: A bolt coupling unit having a release preventing ring is provided to prevent a bolt from being unnecessarily released from the bolt unit by inserting the release preventing ring into a fixing hole of the bolt. CONSTITUTION: A bolt coupling unit includes a bolt(10), and a release preventing ring(20) fixedly inserted into a fixing slot(13) formed in the bolt(10). The release preventing ring(20) includes a ring section(22), plural joint sections(24), plural latches(26), and a relief groove(28) formed between the ring section(22) and the latch(26). The ring section(22) is buried in the fixing slot(13) of the bolt(10). The joint sections(24) are integrally formed with the ring section(22). The latches(26) extend from the joint sections(24) to mountain portions of the bolt(10).

Description

Bolt fastener with release preventing ring {bolt fastener with release preventing ring}

The present invention relates to the field of anti-loosening of a male screw body such as a bolt, and relates to a bolt fastener including a male threaded body having a spiral fixing groove and a snap ring for anti-loosening inserted into the fixing groove to prevent unscrewing will be.

The male thread and the corresponding female thread each have threads formed spirally along the circumference of the longitudinal axis on their outer and inner circumferential surfaces, and are configured to be engaged with each other through the threads.

In general, the fastening and releasing of the male screw and the female screw is performed by the rotation of the male screw or the female screw, and they are kept in a fixed state to some extent by mutual frictional force.

However, since the engagement state between the male thread and the female thread depends on the mutual frictional force, the engagement between the male thread and the female thread is easily released by external influences such as vibration.

To compensate for this, lock nuts consisting of spring washers or double female threads have been used to prevent loosening of the male threads.

However, since the configuration for preventing the loosening also uses frictional forces such as male threads and female threads or washers, there is a limit to precisely preventing loosening.

In particular, there is a certain amount of backlash in the coupling between the male thread and the female thread that further advances the loosening, and it is impossible to prevent the loosening by the above spring washer and the lock nut.

In addition, in the conventional screw fastening, it was common that the loosening preventing means was provided near the distal end of the male screw body that came out of the female screw body, which has been a factor limiting the use range of the male screw body extremely narrowly.

It is therefore an object of the present invention to provide an anti-loosening male screw fastener configured to be prevented from unintentionally loosening by external influences and to be applied to female threaded holes of various lengths.

In this respect, an object of the present invention is a male screw fastener including a male screw body capable of having a helical fixing groove at various positions in the longitudinal direction of its own body portion, and an anti-loosening snap ring inserted into the male screw body portion fixing groove. To provide.

In addition, the male screw fastener as described above, because its bolt is not rotated in the reverse direction by the loosening prevention piece, when used in the assembly of the device that requires disassembly may also require a configuration for loosening.

In this respect, another object of the present invention is to provide a male screw fastener with a snap release ring that is only broken when a predetermined torque is applied in the engaged state.

1 is a side view of the male screw fastener according to an embodiment of the present invention.

Figure 2 is an exploded perspective view of the male screw fastener of Figure 1;

3 is a front view of the male screw fastener of FIGS. 1 and 2;

4 is a sectional view taken along the line A-A of FIG.

FIG. 5 is a cross-sectional view showing the male screw fastener according to the embodiment of FIGS. 1 to 4 being fastened to a screw hole of a frame.

Figure 6 is a view showing a number of applications of the male screw fastener according to the present invention various applications.

In order to achieve the above object, the present invention is a male screw fastener comprising a male screw body having a fixing groove of the same inclination as the lead angle of its own thread, and a snap ring for preventing loosening inserted into the fixing groove of the male screw body. The release ring snap ring, the central ring portion embedded in the fixing groove; A plurality of connecting portions formed radially integrally with the ring portion; A plurality of latches extending from each of the connecting portions to an upper portion of the threaded rod of the male threaded body in a direction opposite to the screw thread of the male threaded body; And a relief groove provided between the ring portion and the latch to allow deformation of the latch, wherein a separation distance between the latch and a neighboring thread is defined as N times the pitch of the male thread (N = natural number). do.

Now, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in detail.

1 is a side view of the male screw fastener 1 according to the present embodiment as a whole, 2 is an exploded perspective view of the male screw fastener 1 according to the embodiment of FIG.

1 and 2, the male screw fastener 1 according to the present embodiment includes a male screw body 10 (hereinafter referred to as a bolt) and a snap ring 20 for preventing loosening.

The bolt 10, as is well known, comprises a head portion 11 and a body portion 12 having threads 14 formed on at least a portion thereof.

Here, the thread of the threaded 14 forms one lead angle α with respect to a straight line perpendicular to the central axis x of the bolt 10, as shown in FIG. Will be self explanatory.

In addition, the bolt 10 includes a helical fixing groove 13 (see FIG. 2) having the same inclination angle as the lead angle α. In the figure shown, although the fixing groove 13 is shown to be formed in the body portion 12 near the head portion 11 of the bolt, this is only one embodiment, it is not intended to limit the present invention. It can be formed in any part of the body portion 12 of the bolt 10, which will be apparent to those skilled in the art.

The fixing groove 13 is inserted and fixed to the anti-loosening snap ring 20 which forms an important feature of the present invention.

The snap ring 20 is formed of a partially open C-type can be opened at both ends, and thus, can be inserted into the fixing groove (13).

Meanwhile, an unevenness 29 is formed in the inner circumference of the snap ring 20 so that the snap ring 20 can be preferably fixed in the fixing groove 13, and the unevenness ( It is preferable that other irregularities 19 (see FIG. 4) corresponding to 29) are formed.

Accordingly, the unevenness 29 of the snap ring 20 and the unevenness 19 of the fixing groove 13 are engaged with each other. By such engagement, the snap ring 20 is restricted in the circumferential direction. It can be preferably fixed in the fixing groove (13).

At this time, the fixing of the snap ring 20 to the fixing groove 13 can be achieved by various methods, for example, welding, which will be apparent to those skilled in the art.

The anti-loosening snap ring 20 may be made of the same material or different materials as the bolt, and more preferably made of a metal or plastic polymer that is easily elastically deformed.

Figure 3 is a front view showing a male screw fastener in the present embodiment from the front, Figure 4 is a release ring 20 is shown in Figure 1 to show a state fixed in the fixing groove 13 of the bolt 10 A cross-sectional view of the male fastener taken along AA of FIG.

2, 3 and 4, the release preventing snap ring 20 is a circular ring portion 22, a plurality of connecting portions 24 formed radially integrally from the ring portion 22, A plurality of latches 26 extending diffusionally from each of the connections 24 along the threaded direction z of the bolt 10, the ends of each of the latches 26 being a thread angle of the male screw; It is preferable that the angle is the same as (β; see FIG. 1).

Here, the connecting portion 24 is a portion for connecting the ring portion 22 and the latch 26 integrally, and at this time, the latch 26 between each of the latches 26 and the outer peripheral portion of the ring portion 22. ) Is formed with a relief groove 28 which allows the inner side to be deformed toward the ring portion 22.

In addition, each of the latches 26 inserted into the fixing groove 13 of the bolt 10 is positioned below the thread 14 of the bolt 10 near the connecting portion 24, and each of the latches 26 is As it extends in a gentle curve in the opposite direction to this thread z, the tip 26a of each of the latches is positioned above the threaded peak 14a of the thread 14 (see FIG. 3).

In other words, the distance between the screw shaft center and the connecting portion 24 is smaller than the total radius r1 of the bolt 10 (see FIG. 3), and the distance r2 between the screw shaft center and the latch tip 26a. 3 is slightly larger than the total radius r1 of the bolt 10. Herein, the term "overall radius r1" refers to the distance between the central axis of the bolt 10 and the peak of the thread 14, i.e., 1/2 of the outer diameter of the body portion 12 of the bolt 10. it means.

As briefly mentioned above, the relief groove 28 of the release preventing snap ring 20 provides a space in which the latch 26 can be deformed inwards, preferably elastically deformed, and the size of the space is defined by the latch ( To the extent that the tip 26a of 26 is positioned below the thread 14, i.e., the distance r2 between the center of the snap ring 20 and the tip 26a is deformed by the deformation of the latch 26. It is set to allow it to be smaller than the total radius r1 of the bolt 10.

On the other hand, as briefly mentioned above, each of the latches 26 extends in the opposite direction of the thread (z), whereby when the bolt 10 is rotated in the forward direction, the bolt 10 and the snap ring 20 Becomes forwardly forward, and when the reverse rotational force is applied to the advanced bolt 10, the latch 26 of the anti-loosening piece 20 is screwed in the female threaded hole 30 by the elastic restoring force F in the radial direction. (32), the retraction of the bolt (10) is prevented.

This operation will be more clearly understood with reference to FIG. 5, which is a cross-sectional view of the male screw fastener 1 according to the present embodiment cut to show the state in which the female screw hole 30 is fastened to the female screw hole 30.

As shown in Fig. 5, the latch 26 of the loosening prevention piece 20 according to the present embodiment is engaged with the thread 32 of the female threaded hole 30, wherein the latch 26 is a ring portion. It is deformed inward toward 22.

Here, since the latch 26 is extended in the opposite direction to the thread line z and the tip portion 26a is in contact with the threaded valley portion 32a of the female thread or the hole 30 so as to prevent the reverse rotation, the male screw fastener is used. The bolt 10 of (1) proceeds in the reverse direction by the contact of the tip portion 26a of the latch 26 having the elastic restoring force F in the radial direction and the valley portion 32a of the female threaded body 30. Will be prevented.

At this time, since the latch 26 has a shape in which the latch 26 gradually converges from its tip portion 26a to the connecting portion 24 along the screw line direction y, the forward rotation of the male screw fastener 1 is performed by the female screw hole. It can be allowed continuously in 30.

Here, the distance between the end of the latch 26 and the thread 14 of the bolt 10, as shown in FIG. 1, allows the snap ring 20 to advance along the thread of the screw hole 30. In order to achieve this, the bolt pitch P of the bolt 10 is set to N times (N = natural number).

2 and 3, it can be seen that the notch 25 for self-destruction is formed in the connection portion 24 of the snap ring 20 according to the present embodiment.

The self-destruction notch 25 is formed to dismantle the device when the male screw fastener 1 according to the present invention is applied to the assembly of a device that needs to be dismantled.

The notch 25 is sized so that the snap ring 20 can be destroyed when a predetermined rotational torque is applied to the male screw fastener 1, which may vary depending on the material of the snap ring 20.

6 is a view showing an example of application of the male screw fastener 1 according to the present invention in various applications.

As shown in FIG. 6, the above-described anti-loosening snap ring 20 may be fixed at various positions along the longitudinal direction of the body portion 12 of the bolt 10, which may be a female screw hole 30. The anti-loosening male screw fastener enables a wider range of applications than the prior art in which the anti-loosening means were provided at the end of the bolts passed.

As described above, the present invention prevents the loosening mechanically by the latch, so that the loosening of the male screw such as bolts can be more strictly restrained than the fastener for preventing friction loosening using the lock nut or the spring washer. There is an effect of preventing loosening of the male thread without being affected by the backlash inevitably generated during tightening.

In addition, the male screw fastener according to the present invention has an effect that can be applied to the unavoidable device because it is provided with a notch that is caused only by a predetermined rotational torque.

In particular, the male screw fastener according to the present invention has a very wide range of applications than the conventional anti-loosening fastener because the means for preventing loosening can be installed at any position along the body portion of the male screw.

Claims (3)

Male threaded body having a fixing groove of the same inclination as the lead angle (α) of its own thread (14), and a snap ring (20) for preventing loosening inserted into the fixing groove (13) of the male threaded body (10) Male thread fastener (1) comprising a, Here, the release preventing snap ring 20, A central ring portion 22 embedded in the fixing groove; A plurality of connecting portions 24 integrally formed radially with the ring portion 22; A plurality of latches 26 extended from each of the connecting portions 24 to an upper portion of the threaded rod 14a of the male threaded body 10 along the threaded direction Z of the male threaded body 10; A relief groove 28 provided between the ring portion 22 and the latch 26 to allow deformation of the latch 26; A male thread fastener with an anti-loosening snap ring characterized in that the distance between the latch 26 and the neighboring thread 14 is determined by N times (N = natural number) the pitch P of the male screw 10. . The method of claim 1, End of each of the latch 26 is a male screw fastener, characterized in that made of the same angle as the thread angle (β) of the male screw body (10). Investigation or fastener according to claim 1, characterized in that the connection part (24) is formed with a self-destruction notch (25) so that the snap ring (20) can be destroyed when a predetermined rotational torque is applied. .