JPS6332412Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to an improvement of a through bolt for fastening parts to be tightened, and allows tightening work from only one side without fixing the bolt head. It is an object of the present invention to provide a through bolt that can be tightened without requiring fine adjustment of tightening tools such as those that facilitate work.

When fastening bulky components, etc., rather than simple plate-shaped fastened parts on the assembly line of automobiles or industrial machinery, if the upper part of the bolt cannot be fixed, using a through bolt and nut can be used. The bolts may rotate in the tightening direction,
In addition, there was a drawback that the material escaped in the axial direction, resulting in extremely poor workability.

For example, in the structure of the mounting and tightening part of a body mount for an automobile part, as shown in Fig. 1, the conventional structure connects the vehicle body A and the floor B via a rubber C having a relatively high natural vibration. If you try to tighten the nut D from below the vehicle, you will need to fix the neck with a wrench or the like to prevent the bolt E from rotating together.

If the neck of the bolt cannot be fixed, the rotation of the nut D causes the bolt E to rotate together, and the force F from the tightening direction causes it to escape upward, making it difficult to tighten with the tightening tool. it takes time. The present invention has the structure described in the claims for utility model registration, so that when the bolt is inserted into the fastened member, the short claws provided on the large diameter side of the locking ring will cause the bolt to be fastened. It is locked to the edge of the hole to prevent the bolt from escaping or slipping out when the nut is tightened, and the claw of the long leg comes into contact with the periphery of the bolt hole of the object to be fastened, and the claw of the short leg is locked and the long leg of the bolt is locked. The frictional resistance created by the contact of the claws prevents the bolts from rotating together when tightening nuts, eliminating the need for fine adjustments to tightening tools such as impact wrenches, and improving the workability of tightening work with through bolts. This has the effect of shortening the working time.

This effect is also possible when the positions of the bolts and nuts are reversed, and even when the bolts are passed from below, with the conventional structure, the bolts fall and workability is poor, but with the present invention, The action of the short toenails can be effective in preventing the bolt from falling off.

The configuration of the illustrated example will be explained below.

FIG. 2 schematically shows only the main structure of an embodiment of the present invention.

In FIG. 2, a bolt neck 2 of a through bolt 1 is provided with a locking portion 3 in the form of a groove. A locking ring 4 shown in FIG. 3 is fitted onto the through bolt 1, and the locking ring 4 is formed into a truncated conical shape by pressing a plate material such as a spring steel plate. The inner hole 5 is sized to allow the bolt neck 2 to pass through, and the small-diameter side edge 6 is formed with a pawl 7 that is fitted and locked into the locking portion 3 of the bolt neck 2. On the large diameter side edge 8, substantially rectangular long toenails 9 and short toenails 10 are arranged alternately on the circumference and extend in the generatrix direction.

The locking ring body 4 having the above structure is externally fitted onto the through bolt 1 with the large diameter side edge 8 facing the bolt neck 11 side.

In the above structure, the locking portion 3 of the bolt neck 2
may be a continuous portion of unevenness formed on the outer peripheral surface of the neck portion 2.

In addition, the long toenail 9 is connected to a bolt hole 17 which will be described later.
It has an angle with respect to the inner surface of the bolt 1 toward the direction of rotation of the bolt 1, that is, it has a slightly twisted shape.

Figure 2 shows the through bolt 1 fitted with the locking ring 4.
1 shows a structure in which the floor 12 and the frame 13 are firmly fastened with a nut 16 via a bush 14 and a body mount 15 having a cushioning rubber structure.

In the structure shown in Fig. 2, the bolt hole 2 of the floor 12
2 and the bolt holes 17 and 18 of the bush 14, when the through bolt 1 with the lock ring 4 fitted onto the outside is inserted from the direction of arrow G, the pawl 10 of the lock ring 4 is elastically deformed and the bolt hole 16 is inserted into the bolt hole 16. , 17 and after passing through the bolt hole 17, it expands and the flange 1 of the bush 14
The through bolt 1 comes into contact with the bolt hole edge 20 which is the lower surface of the bolt hole 17 of No. 9, and prevents the through bolt 1 from escaping in the direction of the arrow H. At this time, the long claw 9 is elastically deformed in the diametrical direction on the side surface, and the bolt hole 1 of the flange 19 is
It is in elastic contact with the inner surface of 7.

Since the long claw 9 is twisted as described above, when the nut is tightened, the side edge 24 of the long claw 9 comes into contact with the bolt hole 17 so as to bite into the bolt hole 17, thereby providing a rotation prevention function. Furthermore, even when rotating the bolt, the claws 9 of the locking ring 4 that rotate together with the bolt come into contact with each other and the resistance is small, but when the bolt is rotated, the edge 24 comes into contact with the bolt hole 17 so as to bite into it. Provides anti-rotation function.

The tip edge 23 of the long claw 9 is in contact with the lower surface of the washer 21. In addition, when the washer 21 is not present, it hits the lower surface of the bolt neck 11. Since the long toenail 9 is twisted as described above, the tip edge 23 of the long toenail 9 intersects with a circle imaginary around the axis of the bolt neck 11 or washer 21. Therefore, if the locking ring body 4 and the bolt neck part 2 rotate relative to each other, the tip edge 23 of the long claw 9 and the washer 21 will move even in the plane of a relatively large width A (see FIG. 4). We will come into contact with each other.

Therefore, the resistance at that time will be very large.

In addition, as is clear from FIG. 2, the locking ring body 4
The length of the claws 9 and 10 is determined by the distance between the bolt hole edge 20 of the flange in which the bolt hole of the object to be fastened is drilled and the lower surface of the bolt neck 11 or the lower surface of the washer 21 and the locking of the bolt neck 2. The dimensions are selected to be optimal in relation to the position of the portion 3.

With the above structure, when the nut 16 is applied to the through bolt 1, the force in the axial direction of the bolt is applied to the through bolt 1 because the short claw 10 of the locking ring 4 is locked with the bolt hole edge 20. The nut 1 is prevented from escaping in the direction of arrow H due to the force in the axial direction of the nut 1, and the friction between the short leg claw 10 and the bolt hole edge 20 and the elastic contact between the long leg claw 9 and the bolt hole 17 prevent the nut 1 from escaping in the direction of arrow H.
This prevents the bolts from rotating together due to tightening in step 6.
Work efficiency is greatly improved and work time can be shortened.

Therefore, according to the present invention, the claws on the large-diameter side edge of the locking ring fitted onto the bolt 1 can prevent the bolt from falling off and prevent it from rotating together with the nut 16, thereby making it possible to prevent the tightening tool from rotating. Since fine adjustments are not required, this method has the effect of significantly shortening the working time compared to conventional tightening methods.

Furthermore, in the present invention, the long claw of the locking ring is slightly twisted at an angle toward the direction of rotation of the bolt, so when tightening the nut, the long claw is Since the part edge comes into contact with the bolt hole so as to bite into it, together with the claws on the small-diameter side edge of the locking ring being locked into the locking part of the bolt, a large rotation prevention function is obtained. In addition, the long claws of the locking ring are formed into a substantially rectangular shape and are slightly twisted at an angle toward the direction of rotation of the bolt. Since the tip edge of the toenail touches the washer, etc. in such a way as to intersect with the circle centered on the axis of the washer, the side edge may bite into the bolt hole and the small diameter side edge of the locking ring. Combined with the fact that the pawl is engaged with the locking part of the bolt, a great anti-rotation function is achieved. Therefore, according to the present invention, it is possible to more accurately prevent the bolts from rotating together due to the tightening of the nuts. In addition, since rotation of the bolt in the opposite direction to the tightening direction is prevented by the biting of the side edges and tip edge and the biting of the claws on the small diameter side edge, loosening of the bolt can be prevented. It is possible.

[Brief explanation of the drawing]

Fig. 1 is an exploded longitudinal sectional view showing a conventional fastening structure using a through bolt, Fig. 2 is an exploded longitudinal sectional view showing a fastening structure according to an example of the implementation of the present invention, and Fig. 3 is a perspective view of an example of a locking ring. Figures 4 and 4 are plan views showing one half of the locking ring body, with one half omitted, and Figure 5 is a longitudinal sectional view of the locking ring body. 1: Through bolt, 2: Bolt neck, 3: Locking part, 4: Locking ring, 5: Inner hole, 6: Small diameter side edge,
7: Nail, 8: Large diameter side edge, 9: Long toenail, 10:
Short toenails, 11: bolt neck, 23: tip edge, 24: lateral edge.

Claims (1)

[Scope of utility model registration request] A bolt with a locking part consisting of a protrusion or groove on the circumference of the bolt neck has a locking ring body formed into a conical shape by pressing a plate material, with its large diameter side facing the bolt neck. The inner hole of the locking ring is large enough to allow the bolt to pass through, and the small diameter side edge of the locking ring has a pawl that is locked to the locking part of the bolt. The large-diameter side edge is formed into a generally rectangular shape with a tip edge that touches the bolt neck or the washer under the bolt neck, and is slightly twisted at an angle toward the direction of rotation of the bolt. A through bolt characterized in that shaped long toenails and short toenails are arranged alternately on the circumference and extend in the generatrix direction.