JPS623317Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of the mounting portion of a steering lock device for an automobile.

Automobile steering lock devices are used to prevent automobile theft, and one known structure for attaching them to the steering shaft is one in which the steering shaft is held between the lock device body and a set cover, and the lock is secured with a set bolt. It is being

Fig. 1 shows a conventional example of this type of lock device, and 1 is a lock device main body having a key insertion hole 2 and incorporating an ignition switch mechanism, a lock bar drive mechanism, etc. as appropriate. Attachment legs 3, 3 are integrally provided on the upper surface and protrude from the casing.
A U-shaped recess 4 is formed between the mounting legs 3 according to the outer shape of the steering shaft, and a lock bar 5 protrudes when the key is removed from the bottom of the recess 4. , 3 are provided with screw holes 6, 6 for set bolts. Reference numeral 7 designates a set cover, which is provided with an arcuate portion 8 corresponding to the outer shape of the steering shaft, and further provided with holes 9, 9 for set bolts on both sides of the arcuate portion 8.
10 is a set bolt, and 11 is a steering shaft. To attach it to the steering shaft 11, as shown in the figure, clamp the steering shaft 11 between the locking device main body 1 and the set cover 7, and then insert the hole 9.
This is done by screwing the set bolt 10 that passes through the screw hole 6 into the screw hole 6, but since it is necessary to prevent the set bolt 10 from being removed for the purpose of preventing theft, the set bolt 10 is provided with a narrow diameter portion 10a. It is common practice to thread the narrow diameter portion 10a after tightening.

However, in the conventional example of such a structure, if a groove is formed in the threaded part using a chisel or the like, it is not impossible to loosen the set bolt 10 again using a screwdriver or the like. Since the attached locking device can be removed, there is a problem in that the purpose of preventing theft cannot be completely achieved.

The present invention was made with the aim of solving the problems in the conventional example as described above, and involves providing a protrusion around the screw hole for the set bolt on the lock device body, and using this protrusion to connect the screw hole for the set bolt on the set cover. When the set bolt is tightened, the protrusion is crushed by the collar of the set bolt and the lock device main body and set cover are caulked together, so that the lock device main body and the set cover are fixed simply by screwing. Not only that, but mechanical caulking is also used, so even if the set bolt is removed, the lock device itself cannot be removed, making this an automotive steering lock device that more reliably prevents vehicle theft. This is what was provided.

Embodiments of the present invention will be described below based on the drawings. FIG. 2 shows the flange 10b of the set bolt 10.
A tapered surface 10c of a caulking surface is provided in the lower surface recess of the
An example is shown in which the protrusion 12 provided around the screw hole 6 on the top surface of the mounting leg 3 of the lock device main body is crushed by the tapered surface 10c to form a caulked part 12a that wraps around the hole 9 of the set cover 7. ing.

FIG. 3 shows a chamfer 9a in the hole 9 of the set cover 7.
The caulked portion 12a is chamfered 9.
Pressure is applied to a to make it flush with the upper surface of the set cover 7. In this case, the flange 1 of the set bolt 10
The lower surface of 0b may remain flat.

Further, in FIG. 4, the hole 9 is chamfered 9a, and the lower surface of the collar 10b has a protrusion 10d having a V-shaped cross section.
is provided, and the protrusion 12 is crushed by the protrusion 10d, and the caulked portion 12a has a cross section Y.
A strong caulked part is obtained in the shape of a letter.

In any of the above cases, after the set bolt 10 is tightened, it is bent at the narrow diameter portion 10a, and the head portion is removed, as shown in each figure b.

Note that the caulked part formed by crushing the protrusion not only holds down the set cover, but also bulges toward the set bolt and pressurizes its threaded part, making it difficult for the set bolt itself to come off and making it easier to remove the locking device. Prevention will be more complete. Therefore, the protruding length of the protrusion and the shape of the lower surface of the flange of the set bolt need only be selected so that these effects can be sufficiently exerted, and are not limited to the embodiments shown in FIGS. 2 to 4. do not have.

As mentioned above, in the present invention, the protrusion provided around the screw hole is crushed and the locking device body and set cover are caulked together, so the locking device cannot be easily removed and the purpose of preventing theft is not achieved. Moreover, since the projection is automatically crushed by tightening the set bolt, there is no need for any extra man-hours or materials, and a more sufficient effect can be obtained with the same cost and work content as the conventional method. This has the advantage that it can be used.

[Brief explanation of the drawing]

Figure 1 is a partially cutaway front view of the conventional example, Figures 2 to 4 are sectional views of essential parts of the embodiment of the present invention, and a in Figures 2 to 4 shows before tightening the set bolt. , b show the state after tightening the set bolt, respectively. 1 is a lock device main body, 6 is a screw hole, 7 is a set cover, 9 is a hole, 10 is a set bolt, 10b is a collar, 11 is a steering shaft, and 12 is a protrusion.

Claims (1)

[Scope of utility model registration request] A steering lock device for an automobile is installed by clamping the steering shaft between the lock device body and the set cover, and fixing the set cover to the lock device body by screwing with a set bolt. A protrusion is provided around the screw hole for the set bolt, and this protrusion is inserted into the set bolt hole of the set cover, and when the set bolt is tightened, the protrusion is crushed by the collar of the set bolt to caulk the locking device body and the set cover. An automobile steering lock device characterized by: