JPS5929133Y2 - Bolt and nut loosening device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a loosening prevention device for bolts and nuts, and particularly to a loosening prevention device used when a fixed object such as a rail is elastically fixed with a clip.

For example, to fix railway rails, both sides of the rail are held down with elastic clips and these clips are tightened with bolts and nuts. Bolts and nuts must be tightened to prevent them from loosening.

Various devices have been proposed to correct the loosening mentioned above, but all of them have complicated structures and are expensive, and in the case of railways that use a large number of bolts and nuts, the economic burden is high. There is a problem that the device is large, and the tightening operation is troublesome and the work cost is high.Therefore, there is a strong desire for a loosening claw device that has a simple structure, is inexpensive, and is easy to operate.

This idea was created in view of the above points, and focused on the fact that the top surface of the rail fixing clip is an arcuate surface, and uses this arcuate surface and the bolt insertion hole to prevent loosening IE. The purpose of the present invention is to provide a device that can effectively prevent loosening by applying simple processing to the tightening surfaces of bolts and nuts.

Hereinafter, embodiments of this invention will be described based on the accompanying drawings.

The locking device of this invention has a bolt 1, a nut 2, and an elongated hole through which the shaft of the bolt is inserted in an arcuate surface, and a clip 6 that elastically fixes the object by tightening the bolt 1 and nut 2. In the tightening seat surface of the bolt 1 or nut 2, a recessed groove 3 is formed along the direction intersecting the axis from both sides of the outer circumference and deepens toward the solid axis. Projecting step portions 4, 4 on both sides along the groove direction
It is configured with the following.

1 to 5 show a first example in which a nut 2 for tightening a clip 6 of a rail 5 is provided with a loosening correction device, and a recess 3
As shown in FIG. 2, it is formed into an arcuate surface that matches the upper curved surface of the clip 6.

The protruding step portions 4, 4 provided on both sides of the recess 3 are formed along the direction of the arcuate surface and have a width that fits into a bolt insertion elongated hole 7 provided in the clip 6.

The recess 3 is set to match the curved surface of the clip 6 when the nut 2 is screwed into the anchor bolt 8 and the clip 6 is tightened, thereby causing the first loosening of the nut 2.

That is, the tightening seat surface of the nut 2 is lowest on both sides due to the formation of the recess 3, and in order for the nut 2 to rotate in the loosening direction, the lowest portions on both sides must pass the top of the clip 6. First, since the pressure contact elasticity of the clip 6 is always acting, the first loosening prevention occurs due to the pressure contact between the recess 3 and the upper surface of the clip 6.

Next, when the nut 2 is tightened, the projecting steps 4 and 4 on both sides fit into the elongated hole 7, and engage with the upper side edge 7a of the elongated hole 7 in the rotational direction, so that the projecting steps 4 and 4 A second locking mechanism is generated.

The protruding step portion 4 can be formed by reducing the cutting amount at the center of the nut 2 and leaving a band-shaped protruding portion when forming the recess 3 by cutting, and the step portion 4 is parallel to both sides sandwiching the screw hole 9. is formed.

Although the protruding step portions 4, 4 in the first example are formed by right-angled surfaces, they may be formed by inclined surfaces 4a as in the second example shown in FIGS. 6 and 7. With such an inclined surface 4a, when tightening the nut 2, the protruding step portions 4, 4 can be smoothly placed back on the upper side edge 7a of the elongated hole 7,
Tightening work becomes easier.

In addition, when adopting the inclined surface 4a, the entire length of the protruding step 4 may be made into an inclined surface as shown by the dashed line in FIG. 7, but if the nut 2 is rotated as shown by the solid line in In this case, only the two end portions that contact the upper side edges may be inclined surfaces 4a, and the remaining middle portion may be left at right angles.

Next, FIG. 8 shows a third example showing a different shape of the recess 3, in which the recess 3 is formed into an inverted square shape when viewed from the front.

FIG. 9 shows a fourth example in which the tightening seat surface is formed by the collar 10, and the collar 10 is provided with a recess 3 and a step 4.

The fifth example shown in FIG. 10 is applied to the bolt 1, and the same effect applies to the bolt of the collar body.

The locking device of this invention has the above-mentioned structure and is used for the rail clip 6 or a similar portion having an arcuate upper surface and performing elastic fixing.

As shown in FIG. 1, the nut 2 is screwed into the anchor bolt 8 passing through the elongated hole 7 of the clip 6 and tightened. When the predetermined tightening force is reached, the recess 3 is aligned with the arcuate surface of the clip 6. When the recess 3 and the clip 6 are pressed against each other, a first loosening mechanism is generated, and the protruding step portions 4 and 6 on both sides are prevented from loosening.
4 fits into the elongated hole 7 and engages with the upper side edge 7a of the elongated hole 7, thereby creating a second locking mechanism.

In this way, by simply screwing in the nut 2 or bolt 1, the four parts 3 and the protruding step parts 4, 4 exert a two-step loosening effect, and even if vibrations etc. are applied, the elasticity of the clip 6 is Due to the above-mentioned loosening prevention, the bolt 1 or nut 2 will not loosen.

As mentioned above, according to this invention, bolts, nuts,
The arc-shaped surface is provided with a long hole through which the shaft of the bolt is inserted, and the clip elastically fixes the fixed object by tightening the bolt or nut. A recess is formed in the intersecting direction, and a protruding step is provided on both sides of the recess along the groove direction to engage the elongated hole of the clip, so that the recess comes into pressure contact with the object to be tightened when the bolt or nut is tightened. At the same time, since the protruding step engages with the side edge of the bolt insertion hole and groove, the locking effect is also generated in this part, and the synergistic effect of both locking mechanisms prevents bolts and nuts from tightening. Effective loosening correction can be obtained only by tightening.

In addition, since bolts and nuts only need to be provided with a recess and a protruding step on the tightening surface side, processing is easy, and there is no need for washers or separate loosening means, so the cost is low. , it is also economical to use a large number of them.

Furthermore, since the protruding step portions on both sides of the bolt and nut engage with the elongated hole of the clip, the bolt shaft is held in the center of the elongated hole in the width direction, and contact between the bolt shaft and the clip is prevented. No excessive force is applied to the threads of bolts or nuts, and no damage occurs.

Furthermore, since loosening can be corrected by simply screwing in bolts and nuts, tightening work is easy and efficient, and work costs can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing a first example of the locking device according to the invention in use, FIG. 2 is an enlarged front view showing the main parts of the same, FIG. 3 is a side view of the same, and FIG. Figure 5 is a perspective view of the same, Figure 6 is a side view showing the second example of the same, and Figure 7 is a side view of the same.
The figure is a bottom view of the same, and FIG. 8 is a front view showing the third example of the same.
FIG. 9 is a front view showing the fourth example, and FIG. 10 is a front view showing the fifth example. 1...Bolt, 2...Natsuto, 3...
...Recessed portion, 4...Protruding step, 4a...Slanted surface, 6...Clip, 7...Bolt insertion elongated hole.

Claims (1)

[Scope of utility model registration request] It consists of a bolt, a nut, and a clip, which has an elongated hole in an arcuate surface through which the shaft of the bolt is inserted, and elastically fixes the object to be fixed by tightening the bolt or nut.
A recess that deepens from both sides toward the solid axis is formed in the tightening seat surface that presses against the arc-shaped surface of the nut clip, and a recess that deepens from both sides toward the solid axis is formed along the direction intersecting the axis. A device for correcting loosening of bolts and nuts, which has a protruding step that engages with the elongated hole when tightening.