JPH0351492Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a cylinder lock in which the key number cannot be read from the keyhole of the rotor.

[Prior art]

Conventionally, the rotor of a cylinder lock could not be opened without a key.
There is No. 1251, which works by applying rotational force to the rotor and engaging the protruding shoulder 13 of the cylinder of the uppermost tumbler with the inner circumference 14 of the rotor using a wire, and the force of the spring will keep it in that state even if the wire is removed. Because it is retained, it can be unlocked without a key.
This is to prevent malicious unlocking. However, even in such a case, as shown in FIGS. 3 and 4, a plurality of tumblers 3 set on the rotor 1 are brought into contact with the cylinder recess 15 by the force of the spring, and the fitting surface with the key, that is, the rear end edge of the key hole. Since the row of keys is a step relative to the key pile, it is possible to decipher the key number, and it is now easy to duplicate keys, so there was still a risk of theft.

[Means for solving problems]

In the present invention, a shoulder 6 is formed on the side of the tumbler as shown in FIGS. 1 and 2, and a stopper 7 is provided near the tumbler insertion opening of the tumbler groove 4 corresponding to this shoulder. The shoulder 6 engages to restrict the protrusion of the key from the rotor, and the rear edge 9 of the key hole of the tumbler protruding into the key insertion slot in the center of the rotor is arranged so as not to be arranged relative to the key thread. It is characterized by preventing the number from being deciphered.

〔Example〕

The cylinder lock according to the present invention is a cylinder lock in which a plurality of tumblers 3 are set via springs 2 in tumbler grooves 4 provided in multiple stages in a rotor 1, and each tumbler has a cylinder lock opposite to the spring receiver 5 on the head side of the tumbler. A notched shoulder 6 is provided on the side of the tumbler at a position where the dimension with the rear edge 9 of the key hole 8 in the center of the tumbler is constant, and after each tumbler is inserted into the tumbler groove 4 via a spring, The outer end of the tumbler groove on the side corresponding to the shoulder 6 is caulked inward to form a stopper 7, and in the natural state where the tumbler is biased toward the head side by the spring, the rear end of the keyhole of each of the plurality of tumblers is The edges 9 are arranged in a straight line parallel to the axis of the rotor.

[Effect]

In the cylinder lock according to the present invention, the position of each tumbler 3 in its natural state without a key inserted is determined by the engagement between the tumbler shoulder 6 and the stopper 7 of the rotor, as shown in FIG. are located in a straight line parallel to the axis of the rotor. Therefore, even if you look at the state of protrusion of each tumbler from the key insertion slot in the upper part of the rotor, it is impossible to read the key threads because they are all the same.

〔effect〕

This invention makes it impossible to decipher the key number from the key insertion slot, and is useful in preventing theft of automobiles and other items equipped with cylinder locks, as well as preventing the tumbler from falling off from the rotor during the assembly process. be.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view taken along line A-A in Fig. 2, which shows an example of the present invention, Fig. 2 is a partial longitudinal cross-sectional side view, Fig. 3 is a cross-sectional view taken along line B-B in Fig. 4, which shows a conventional product, and Fig. 4. is a partially vertical side view of the conventional product. 1...Rotor, 2...Spring, 3...Tumbler, 4
...Tumbler groove, 5...Spring holder, 6...Shoulder, 7...Stopper, 8...Key hole, 9...Rear end edge.

Claims (1)

[Scope of utility model registration request] In a cylinder lock in which a plurality of tumblers 3 are set via springs 2 in tumbler grooves 4 provided in multiple stages in the rotor 1, a central portion of the tumbler is placed on the side opposite to the spring receiver 5 on the head side of each tumbler. A shoulder 6 is formed by a notch at a position where the dimension with the rear edge 9 of the keyhole 8 is constant, and after each tumbler is inserted into the tumbler groove 4 via a spring, the tumbler on the side corresponding to the shoulder 6 is inserted. The outer end of the groove is caulked inward to form the stopper 7, and in the natural state where the tumbler is biased toward the head side by the spring, the position of the rear edge 9 of the key hole of each of the plurality of tumblers is parallel to the axis of the rotor. Cylinder locks arranged in a straight line.