JPS6353401B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a locking bolt,
In particular, it relates to locking bolts for socket screw bolts.

Generally, even if a nut is firmly tightened to a bolt, once the nut begins to loosen due to vibration or other impact, the nut will easily rotate in the direction of loosening, resulting in the phenomenon of nut loosening. Therefore, over the past many years, various efforts have been made to prevent the nut from loosening, and measures have been taken to prevent the nut from rotating in the direction of loosening. For example, there are double nut systems and systems in which the washer and nut have a special locking mechanism, but these have not yet been sufficient. Therefore, as new locking bolts,
In literature such as No. 57-57913, the nut tightening position of the bolt is separated, and after tightening the nut at this nut tightening position, the nut is tightened by the tightening force of the separated bolt against the nut in opposite directions. A locking bolt has been proposed that has a mechanism to prevent rotation in the direction of loosening. Although this mechanism is certainly effective as a locking mechanism and can be expected to produce some results, it is also a structure that separates the main body of the bolt.
There are some restrictions on the dimensions of the bolt body,
There are problems such as manufacturing time and effort, lack of mass productivity, and high cost.In addition, it is difficult to screw in the tightening nut if the head side and separate side, which make up the main body of the bolt, are not sufficiently screwed together. There were problems with the lock being difficult to tighten and release.

In view of the above, the present invention is easy to tighten and release screw bolts and nuts, is versatile enough to manufacture screw bolts and lock nuts in a variety of sizes, is easy to manufacture, and is inexpensive with excellent mass production. The purpose of the present invention is to provide a locking bolt.

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

Reference numeral 1 is a built-in screw bolt, and the bolt body 2 and bolt head 3 are respectively provided with threads a and b, and the pitch relationship of the threads a and b is shown in Figures 1 and 2. As shown in Figure 3, a > b, or as shown in Figure 3, a < b. In either case, the pitch relationship must be different, for example, if a = 1.5 m/m. bb=1.0
m/m or if a=2.0m/m then b=1.5m/
m, or conversely if a=1.0m/m then b=1.5
m/m or if a=1.5m/m then b=2.0m/m
It is better to have this pitch relationship. In particular, it is more effective if the screw b is a thin screw. As shown in FIGS. 3 and 4, this screw bolt 1 is provided with an engaging portion 4 for tightening, which may have any shape such as a groove type or a hexagonal hole type as shown. This allows the screw bolt 1 to be tightened to the fixing member 5,
6. Reference numeral 7 designates a lock nut, which has a screw c on its inner circumferential surface that engages with a screw b formed on the bolt head 3 of the screw bolt 1 to increase the friction coefficient of the threaded surface, and its shape is as follows. It is preferably composed of a circular seat surface 7a and a engaging portion 7b for a spanner or a box spanner, and the purpose is to increase the friction area between the circular seat surface 7a and the fixed member 5 to be tightened. When the lock nut 7 is embedded in the fixed member 5 to be tightened as in the invention shown in FIG. 5, it is preferable to insert a box spanner into the engaging portion 7b to rotate the lock nut 7. In this way, in the second invention, since the lock nut 7 is of the embedded type, the fitting hole 8 is provided in the fixing member 5 to be tightened. The other configurations of the screw bolt 1, bolt body 2, bolt head 3, and lock nut 7 are the same as in the previous example, and their explanations will be omitted. It is also possible to use a commercially available screw bolt 1 and to have a screw b carved into the bolt head 3.

Next, to explain an example of the usage state of the present invention, the screw bolt 1 is inserted into the screw hole 9 of the fixed member 5, 6 to be tightened, and then the screw bolt 1
Insert a hexagonal wrench into the engaging portion 4 and screw in the screw bolts 1 one after the other and tighten. Then, by clamping the lock nut 7 with a spanner, nut wrench, etc., and sequentially inserting the screws c into the screws b of the screw bolt 1, the lock nut 7 will be inserted through the seat surface 7a and the screw c. It is firmly held in a locked state by the fixed members 5, 6 to be tightened and the screw bolt 1. In this case, while maintaining the tightening force of the screw bolt 1, the seat surface 7a of the lock nut 7 is pressed against the surface of the fixed member 5 to be tightened, creating a large friction force on the seat surface and maintaining a strong lock. It will be done. Furthermore, as shown in FIG. 6, the screw holes 9 of the fixing members 5 and 6 to be tightened and the screwing surface A of the screw a of the screw bolt 1, the screw c of the lock nut 7, and the screw b of the screw bolt 1. Since the screwing surface B and the lock nut 7 are in opposite directions, loosening of the lock nut 7 is prevented and a strong locked state is maintained. That is, the threaded surface A between the thread a of the bolt body 2 of the screw bolt 1 and the thread d of the fixed member 6 to be tightened, and the thread b of the bolt head 3 of the screw bolt 1 that faces this.
It is configured to be tightened by the threaded surface B of the lock nut 7 and the screw c, and an improvement in axial force can be expected. Therefore, when the lock nut 7 is tightened with a torque above a certain level, even if the lock nut 7 loosens, the tightening force of the screw bolt 1 is maintained, and a sufficient loosening prevention effect can be expected. The lock can be easily released by first unscrewing the lock nut 7 and then unscrewing the screw bolt 1. Although not shown in the drawings, it is believed that the locking force can be strengthened by inserting a washer such as a washer with claws in the above-mentioned interval. In the illustration, the thread a is carved only in a part of the bolt body 2 of the screw bolt 1, but it is of course possible to carve the thread a all over the bolt body 2 depending on the situation.

As described in detail above, the present invention has a configuration in which screws are carved into the bolt body and head of the screw bolt, and the screw pitches are different, so that locking and unlocking are simple and workable as described above. It is very useful as it can be used repeatedly without any damage even after repeated use. Tightening due to the pitch difference and tightening force in opposite directions on the threaded surface of the screw bolt's thread, that is, the opposing thread of the thread on the bolt body of the screw bolt and the thread on the bolt head. The screw bolt is tightened by pressing the mating surface. This has the effect of increasing the axial force of the bolt, and if the lock nut is tightened with a torque above a certain level, even if the lock nut loosens, the tightening force of the screw bolt will be maintained. , a sufficient loosening prevention effect can be expected. Furthermore, since both the screw bolt seating surface and the lock nut seating surface are configured to be clamped to the fixed member to be tightened, it is highly expected that the seating surface area will be expanded and the coefficient of friction will be increased, and the seating surface will be prevented from sinking. It is very effective in avoiding this phenomenon. Further, this improvement in the friction coefficient of the seat surface is synergistic with the opposing screw surfaces, so that the locking force is strong and the lock nut is less likely to loosen. In addition, since the screw bolt has a structure in which threads are carved into the bolt body and the bolt head, there are no dimensional restrictions, and in principle, it is possible to process everything from small bolts to large bolts, making it highly versatile. Furthermore, since threading of the bolt body and bolt head can be performed simultaneously during machining, work efficiency and mass production can be improved, reducing costs and improving work efficiency. In addition, since the screw bolt has a structure in which a screw is carved into the bolt head, it is possible to tighten the fixed member to be tightened from one side (the front side), which is expected to expand the number of places where it can be used and improve workability. It has no inferiority in workability to conventional tightening bolts. Furthermore, the axial dimensions of the bolt body of the screw bolt can be changed freely, allowing for versatile use. Furthermore, even if the lock nut loosens due to an impact, etc., the tightening force of the screw bolt does not change and it is less likely to loosen.This has many practical effects.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; FIG. 1 is a sectional view, FIG. 2 is a sectional view of another example, FIG. 3 is a reduced plan view, and FIG. 4 is a reduced plan view of another example. , FIG. 5 is a sectional view showing an example of an embedded locking bolt of the present invention, and FIG. 6 is an enlarged sectional view illustrating the screwing surface of the screw. 1...screw bolt, 2...bolt body,
3...Bolt head, 4...Engaging part, 5, 6...Fixing member to be tightened, 7...Lock nut, 7a...Seat surface, 7b...Latching part, 8...Fitting hole, 9 ...screw hole, a, b, c, d...screw.

Claims (1)

[Scope of Claims] 1. A screw bolt having a tightening engagement portion in which a bolt body and a bolt head are respectively threaded, and the bolt body and the bolt head have different thread pitches; It consists of a lock nut that is screwed onto the thread of the bolt head of this screw bolt, and the seat surface of the screw bolt and the seat surface of the lock nut are pressed against the fixed member to be tightened in order to expand the seating surface area. The screw bolt is tightened by pressing the opposing threaded surfaces of the threaded portion of the bolt body and the threaded portion of the bolt head of the screw bolt, and is characterized in that the seating surface pressure is increased. locking bolt. 2. A screw bolt with threads carved into the bolt body and the bolt head, and a tightening engagement portion with different thread pitches between the bolt body and the bolt head, and the bolt of this screw bolt. A lock nut is screwed onto the screw of the head, and the screw bolt and the lock nut have a structure in which the bearing surface of the screw bolt and the bearing surface of the lock nut are pressed against the fixed member to be tightened in order to expand the seating surface area, and the lock nut is is embedded in the fixed member to be tightened, and is tightened by pressing the opposing threaded surfaces of the threaded part of the bolt body of the screw bolt and the threaded part of the bolt head, and the bearing surface pressure is A locking bolt that is characterized by its ability to expand.