JPH0348992B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a key device comprising a disc tumbler type cylinder lock and a key plate.

A disc tumbler type cylinder lock has a rotor rotatably fitted into a cylinder. This rotor has a predetermined number of sliding grooves drilled in the radial direction in the axial direction, into which plate-shaped tumblers are inserted and arranged while being biased in the radial direction by a spring. There is. On the other hand, an engagement groove is formed in the inner circumferential surface of the cylinder into which the rotor is fitted in the longitudinal direction, through which the tip of the tumbler in the protruding direction engages and disengages. Normally, the tip of the tumbler in the protruding direction is fitted into the engagement groove by the biasing force of the spring, so that the rotor cannot rotate relative to the cylinder. In this state, when a predetermined key plate is inserted into the key insertion hole provided approximately in the center of the rotor, the tumbler is pulled back until its protruding tip is at least flush with the outer peripheral surface of the rotor, and the cylinder is The engagement groove and tumbler are disengaged. Therefore, the rotor moves to a freely rotatable state with respect to the cylinder.
Key devices with this configuration are widely used for locking automobile doors and ignitions, household doors, container lids, and the like.

In recent years, the number of thefts related to automobiles has increased, and countermeasures have been urgently needed, but it is said that this is largely due to the small number of changes (number of types of combinations) of the above-mentioned key devices. The theoretical number of tumblers is determined by the type of tumbler and the number of tumblers used, so if you simply want to increase the number of tumblers, you can increase the type of tumbler and the number of tumblers used, but if you do this, the key device itself Not only does it become larger and cause problems when assembling the cylinder lock to doors, etc.
The key plate becomes inconvenient to carry and cannot be put to practical use. Furthermore, as shown in Fig. 1, the conventional key plate A has key grooves engraved on its upper and lower edges.
Since the pitch p between B ₁ and _{B 7} is a constant length,
Since the number of changes is naturally reduced, and the pitch p can be easily measured by a third party, it is easy to manufacture counterfeit key plates, and improvements have been desired in terms of preventing theft.

The present invention has been made in view of this point, and its purpose is to provide a key device that increases the number of changes and further prevents theft.

An embodiment of the present invention will be described below with reference to the drawings.

The key device shown in FIG. 2 is a key device for an automobile door, and locks and unlocks the door in cooperation with a door lock device (not shown). In this key device, if the rotor in the cylinder lock 20 is not rotatable relative to the cylinder and the door lock device is locked at that time,
It is impossible to unlock the door lock device and therefore the door cannot be opened. Next, when the key plate 10 is inserted into the cylinder lock 20 and rotational force is applied, the rotor rotates, and the door lock device becomes unlocked by the rotation. This makes it possible to open the door.

FIG. 3 is an outline view showing an embodiment of a key plate in a key device of the present invention having a large number of changes.
Group keyways 1 (C ₁ to C ₇ ) are carved. On the other hand, a second group of key grooves 2C' ₁ to C' ₇ are carved in the lower edge symmetrically with the first group of key grooves 1, so that the key plate can be rotated 180 degrees without directionality. It is a so-called reversible key that can be used without any problems. Pitch p ₁ between the keyways 1 of the first group
p ₆ has unequal length, and the number of stages are (a), (b),
In the four steps (C) and (D) (positions P ₁ to P ₄ ), the step difference is selected to have a size D. Similarly, the pitches p ₁ to _{p 6} between the keyways 2 of the second group have unequal lengths, and the number of stages is (E), (F), (G), and (H) (positions). P ₅ to P ₈ ), and the step size is selected to be D. A tumbler 3 (composed of tumblers _E1 to _E7 ), which will be described later, is engaged with either the first group of keyways 1 or the second group of keyways 2.

FIG. 4 shows one of the tumblers 3, which is housed in the rotor 5 while being urged downward by a spring 4. In this figure, a predetermined key plate 10 is inserted,
A state in which the upper wall of the rectangular hole of the tumbler 3 is in contact with any one of the first group of keyways 1 of the key plate 10 is shown. In this state with the key plate 10 inserted, the lower end of the tumbler 3 does not protrude from the outer peripheral surface of the rotor 5, but in the state where the key plate 10 is pulled out, the lower end of the tumbler 3 protrudes from the outer peripheral surface of the rotor 5, and the lower end of the tumbler 3 does not protrude from the outer peripheral surface of the rotor 5. The rotor 5 is engaged with (fits into) the engagement groove on the inner circumferential surface of the rotor 5, thereby preventing rotation of the rotor 5.

When using the key plate 10 configured as described above, the tumbler dimension L (distance between the upper wall of the rectangular hole and the lower end of the tumbler 3) is based on the tumbler 3 for position P ₁ (L ₀ ). , becomes as follows.

For position P ₁ ...L=L ₀ For position P ₂ ...L=L ₀ -D For position P ₃ ...L=L ₀ -2D For position P ₄ ...L=L ₀ -3D Therefore, in this key device, 4 tiers on the top (I,
A key plate 10 having a total of 8 key grooves, 4 stages (E, H, G, J) at the bottom;
A total of 4 corresponding to the key grooves of this key plate 10
Since different types of tumblers are used and the pitches between the keyways are of unequal length, the number of changes increases significantly. Incidentally, the method of making the pitches of unequal lengths may be changed proportionally or may be changed randomly.
Furthermore, since the pitches are of unequal length, it is difficult to manufacture imitation key plates.

Note that the number of steps of the key groove of the key plate, the number of tumblers, etc. are not limited to those of the above embodiment. Further, in the above embodiments, the present invention has been described with respect to a reversible key, but the same effect can be obtained even if the present invention is applied to a key plate in which the upper and lower key grooves are asymmetrical. Furthermore, if the length of the key device is constant, it is possible to have a larger number of keyways with unequal pitches than with equal pitches.

As explained above, according to the present invention, the number of changes can be increased without substantially increasing the size of the key device, and furthermore, it is difficult to manufacture counterfeit key plates, and the key can be prevented from being stolen. equipment can be provided.

[Brief explanation of drawings]

Fig. 1 is an external view showing a key plate of a conventional key device, Fig. 2 is an explanatory diagram of a key device used for an automobile door, and Fig. 3 is an example of a key plate of a key device according to the present invention. The external view shown in FIG. 4 is a sectional view of the cylinder lock when the key plate of FIG. 3 is inserted. 1C ₁ to C ₇ .... Keyway of the first group, 2C' ₁ to C' ₇ ...
2nd group, 3E ₁ to E ₇ ... tumbler, 4 ... spring, 5 ... rotor, 10 ... key plate, 2
0...Cylinder lock.

Claims (1)

[Claims] 1. A key device comprising a cylinder lock in which a tumbler that protrudes and retracts from the outer peripheral surface of the rotor engages and disengages from an engagement groove on the inner peripheral surface of the cylinder, and a key plate that draws the tumbler into the rotor when inserted into the cylinder lock. . A key device, wherein key grooves that engage with the tumbler are carved at unequal pitches on the upper and lower edges of the key plate.