JPS58178010A - Burglarproof sleeve - 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 an anti-theft sleeve for preventing the head of a threaded bolt or the like from being processed and unduly loosened using a screwdriver or the like.

In general, in places where removal is not required and a certain amount of tightening torque is required, if the threaded part is tightened with more than a certain torque, the threaded part will break off from the head, and you will have to retighten or loosen it afterwards. A threaded bolt is used.

This threaded bolt is used, for example, when installing a steering fixer for fixing a steering key lock.To explain this using an example, as shown in FIG. A steering link key lock 9 as shown in FIG. 2 is fixed by a threaded bolt B so as to sandwich the steering column 11 between the main body 9a and the steering fixer 9b.

Conventionally, this type of threaded bolt, as shown in Fig. 3,
The threaded part 1, the head part 2, and the threaded part 3 are continuous, and a constricted part 4 is formed between the threaded part 1 and the head part 2 so that it will break when a certain torque is applied to the blade. It is formed.

On the other hand, the steering fixer 9b is made of cast metal, and as shown in FIG.
The inner diameter d of the threaded bolt B is larger than the outer diameter of the mark 2 until the mark 2 of the threaded bolt B is buried.
A weight stepped portion 14 is formed which comes into contact with the bottom edge 13 of.

The deeper part is formed to have an inner diameter d2 so that the threaded part 3 can be inserted therethrough, and when the threaded bolt B has been fitted with #A and the threaded part 1 is threaded, the threaded part 3 should be inserted above the -setting surface P. The un part 2 is designed not to protrude.

With the above configuration, the main body 9a of the steering key lock 9 is fixed to the steering column 11, and locks the steering wheel 10 when the key is pulled out.
Without the key, the car cannot be easily moved even if the door is opened.

However, we cannot guarantee that there will be no theft of cars with this type of structure.
For example, use a gold mine or the like to force the entire steering fixer 9b, form a minus groove in the diametrical direction of the threaded bolt BOuA section 2, and then loosen it with a flat head screwdriver in the same way as loosening a bolt with a normal minus groove. There was a fear that if the steering key lock 9 was removed, the lock would be released and the Arashi could be stolen.

This usually involves interference with other parts, and it is very difficult to use gold mines etc., but for a skilled person, it is not impossible, and it is not perfect in terms of theft prevention. Ta.

In addition to the steering key lock, parts that use screw bolts are often important safety parts, so even if the item is not intended for theft, it is easy to use the method described above to screw it off. It was extremely dangerous to have the bolts loosened.

Comparing the materials, the steering fixer 9b is usually made of cast material, and its hardness is HB = 1 in terms of Brinell hardness.
411 to 280, and bolts and general automobile steel plates also have an HRB of 70 to 10 on the Rockwell hardness B scale.
The hardness is approximately 0, and all of these are HRC30 or less on the Rockwell hardness C scale. However, some commercial gold mines have a HHC of nearly 50.
Machining a groove in the f-mouth part itself is easy, but there were some problems with the above-mentioned means of stealing.

Therefore, in view of the conventional situation, it is an object of the present invention to provide a structure that prevents bolts used on both sides from loosening. In order to achieve this object, the present invention provides an anti-theft sleeve that surrounds the outer periphery of the head of a threaded vehicle bolt, etc., and has a hardness of HRC50 or higher, which is higher than the height of the four parts. The anti-theft sleeve is also made so that no force can be used to prevent the teeth of the gold ore from reaching the inside of the sleeve.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the drawings showing embodiments thereof, with the same reference numerals assigned to the same parts as in the conventional structure.

FIG. 5 is a diagram showing a first embodiment of the present invention.

In this embodiment, the fixing method using the twisting pole (B) is the same as the conventional one.

5 is an anti-theft sleeve, and the nuclear anti-theft sleeve 5 has a hardness of HRC50 or more, and the steering fixer 9
It has a cylindrical shape with a height from the general surface P of b to the engaging step portion 14, and itself is similar to the steering fixer 9b.
It is fitted into the upper part 12a of the bolt insertion hole 12 formed in the hole 12, and once it is fitted due to the friction caused by the fitting, it cannot be removed.

With this configuration, even if an attempt is made to create a negative groove by the method described above due to a complete burnout, etc., the anti-theft sleeve 5 will not have any teeth, and the head 2 surrounded by the anti-theft sleeve 5 will not have a negative groove, etc. Since it cannot be machined, there is no need to worry about it being loosened with a flat head screwdriver.

FIG. 6 is a diagram showing a second embodiment of the invention.

This embodiment is applied to a thin member in which the head 2 has to protrude upward from the general surface P, and 6 is an anti-theft sleeve having a hardness of HHC50 or higher. The nuclear anti-theft sleeve 6 is provided with a bottom plate 6a formed with a hole 6a for loosely fitting a bolt into the anti-theft sleeve 5 shown in the second embodiment. , plate-cutting bolt B is fixed in the fully screwed state, surrounds the barrel part 2 in a cylindrical shape, and has a height equal to or higher than the head height. .

With this configuration, even if an attempt is made to make a negative groove by the above-mentioned method due to a complete burnout, etc., the security will not be left on the anti-theft sleeve 6, and the stamp part 2 surrounded by this anti-theft sleeve will be
Since it is not possible to machine slotted grooves, there is no need to worry about loosening with a flat head screwdriver.

Further, in the case of this embodiment, the anti-theft sleeve 6 can be used in the same convenient manner as a washer, so it is effective when used as a replacement for a thin member.

FIG. 7 is a diagram showing a third embodiment of the present invention.

The structure of this embodiment is almost the same as that of the second embodiment, but a washer 7 is incorporated to prevent loosening due to vibrations of the vehicle.

With this configuration, in addition to the effects described in the second embodiment, loosening can be further prevented.

FIG. 8 is a diagram showing a fourth embodiment of the invention.

Like the third embodiment, this embodiment is also intended to prevent loosening, and the area around the threaded bolt insertion hole of the anti-theft sleeve 8 is formed into a toothed washer shape as shown in FIG. , to prevent slackness.

With this configuration, in addition to the effects described in the second embodiment, loosening can be more reliably prevented.

In the above embodiment, the steering key lock was explained as an example, but of course it is not necessary for this part, and the anti-theft sleeve shape is not limited to a cylindrical shape, but a polygonal cross-sectional shape. Needless to say, it may be (ゝ0) As explained above, according to the present invention, there is no need to machine a flathead groove in the head of the bolt and loosen it with a flathead screwdriver. This not only improves the performance of the bolt, but also sufficiently prevents possession of the bolt when the bolt is used in a part that is exposed to the outside of the vehicle.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing the mounting position of the steering key lock, Fig. 2 is a perspective view showing the steering key lock, Fig. 3 is a perspective view showing the threaded bolt, and Fig. 4 is a perspective view showing the threaded bolt. FIG. 5 is a sectional view taken along line A-A in FIG. 2 showing the assembled state of the anti-theft sleeve according to the first embodiment of the present invention. FIG. 7 is a sectional view showing an assembled state of the anti-theft sleeve according to the second embodiment of the invention, FIG. 7 is a sectional view showing the anti-theft sleeve according to the third embodiment of the invention, and FIG. Embodiment 1 FIG. 9 is a front view of the theft prevention sleeve which is the fourth embodiment of the present invention. 2 Figure 7 Figure 8 Figure 9 49-

Claims (1)

[Claims] il+ Surrounds the outer periphery of the bolt head and its height is higher than the height of the bolt hole, Rockwell hardness HRC5
an anti-theft sleeve having a hardness of 0 or more;
.