JP2733790B2 - Cylinder lock - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a tumbler-type cylinder lock that cannot be rotated by an illegal method.

(Prior Art) In a conventional tumbler type cylinder lock, a rotor 2 is rotatably housed in a holder 1 as shown in FIGS. 5 to 8, and a spring 4 and a spring 4 are provided in a keyway 3 of the rotor 2. A tumbler 5 urged in a direction projecting outward from the outer peripheral surface 2a of the rotor 2 by the rotor 4 is slidably accommodated therein. When the key 6 is removed, the lock portion 5b of the tumbler 5 is moved from the outer peripheral surface 2a of the rotor 2 to the holder 1 at a position where the contact portion 5a of the tumbler 5 contacts the inner peripheral surface 1a of the holder 1.
Projecting into the groove 1b. Therefore, in this state, the rotor 2
Cannot rotate. As shown in FIG. 5, the tumblers 5 alternately project upward and downward every other sheet. The tumbler 5 is formed with key insertion holes 5c at different positions as shown in FIGS. 7 and 8, and when the key 6 is inserted, the position of the key insertion hole 5c and the key 6 as shown in FIG. The height of the key ridge 6a coincides with the height of the key ridge 6a, so that all the tumblers 5 are immersed in the rotor 2 to enable the rotation of the rotor 2.

(Problems to be Solved by the Invention) However, in such a structure, the key 6 is not used. For example, the rotor 2 is rotated clockwise from the state shown in FIG. Press down against the urging force to lock the lock 5b on the inner peripheral surface of the holder 1.
There is a possibility that the rotor 2 can be rotated without using a key by riding on the end 1c of the groove 1a on the groove 1b side.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has been designed to prevent theft by depressing a tumbler so that a lock portion thereof can ride on an inner peripheral surface of a holder so that a rotor cannot be rotated. It is intended to provide tablets.

(Means for Solving the Problems) In order to solve the above problems, the present invention includes a plurality of tumblers which are biased by springs in a direction protruding from the outer periphery of the rotor and slidably inserted into grooves of the rotor. When the key is removed, the tumbler protrudes into the groove of the holder from the outer periphery of the rotor to disable rotation of the rotor, and when the key is inserted, the tumbler is immersed in the rotor to enable rotation of the rotor. In the cylinder lock described above, teeth are formed at respective abutting portions of the tumbler and the inner peripheral surface of the holder so that the teeth engage with each other when the key is removed.

(Operation) Even if an attempt is made to rotate the rotor by the above configuration, the rotor cannot be rotated because the teeth of the tumbler and the teeth of the inner peripheral surface are engaged with each other. Even if the tumbler is pushed down against the urging force of the spring, the tumbler cannot be raised on the inner peripheral surface of the holder.

Example Next, an example of the present invention will be described in more detail with reference to the drawings.

In the figure, reference numeral 8 denotes a tumbler. Also in this embodiment, a rotatable rotor 2 is accommodated in a holder 7, and a plurality of tumblers 8 are held in the rotor 2. The tumbler 8 is accommodated in a keyway 3 formed in the rotor 2 in a diametric direction, and the tumbler 8 is fixed to the rotor 2 by a spring 4 inserted between a convex piece 8a protruding from a side piece and a step 2b of the rotor 2. It is urged in a direction protruding outward from the outer peripheral surface 2a. When the key 6 is removed, the lock portion 8b of the tumbler 8 projects into the groove 7a of the holder 7.

Although the basic structure described above is not much different from the conventional example, in the present embodiment, as shown in FIGS. 3 and 4, the inner peripheral surface 7b of the holder 7 comes into contact with the tumbler 8 at the tooth portion 7c. Is formed. Similarly, a tooth portion 8c is formed on the tumbler 8, and when the key 6 is withdrawn, the tooth portion 7c of the holder 7 and the tooth portion 8c of the tumbler 8 are formed.
Are urged by the spring 4 to mesh with each other. The looseness between the rotor 2 and the tumbler 8 is suppressed so that the tip of the tooth 8c of the tumbler 8 cannot cross the tip of the tooth 7c of the holder 7. That is, even if the tumbler 8 is depressed while the rotor 2 is urged clockwise and returned while the tumbler 8 is urged clockwise, the tip of the tooth 8c of the tumbler 8 is It is not possible to get over the clockwise tip of the.

The contact portion 5a of the conventional tumbler 5 and the key insertion hole
The positional relationship with key 5c differs depending on the height of key ridge 6a, and when key 6 is removed, each key insertion hole 5c is inserted into key ridge 6a.
Are arranged at the positions corresponding to the heights. In contrast,
The tooth portion 8c which is a contact portion of the tumbler 8 of the present embodiment with the inner peripheral surface 7b of the holder 7 is provided according to the height of the key peak 6a,
As shown in FIGS. 3 and 4, depending on the position,
The protrusion amount of 8b is different. When the protrusion amount is small as shown in FIG. 3, the key insertion hole 8d is provided at a high position, and when the protrusion amount is large as shown in FIG. The positions of 8c and the key insertion hole 8d are set so as to be at the same interval in any tumbler. When the lock portion 8b is in the protruding state, regardless of the amount of protrusion, the key contact surface 8e is indicated by a chain line in FIG. They are aligned at the positions shown and are lined up at the same height.

According to this embodiment, even if one of the tumblers 8 is pressed down against the urging force of the spring 4 in a state where the rotor 2 is urged clockwise using a jig or the like, the teeth of the other tumblers 8 are pressed. Since the portion 8c is engaged with the tooth portion 7c of the holder 7, the rotor 2 does not rotate, and the tooth portion 8c of the tumbler 8 that is depressed cannot get over the tooth portion 7c of the holder 7, and the rotor 2 rotates. It cannot be moved.

Further, in this embodiment, since the positional relationship between the tooth portion 8c of the tumbler 8 and the key insertion hole 8d is the same, the arrangement of the key insertion holes 8d of the tumbler 8 is aligned at the same height when the key 6 is withdrawn. Therefore, even if the inside is seen through the key insertion opening 2c by an endoscope or the like, the arrangement of the key piles and the like are not recognized.

(Effects of the Invention) As is clear from the above description, according to the present invention, the tooth portions are formed at the respective contact portions between the tumbler and the inner peripheral surface of the holder, and the respective tooth portions are formed when the key is removed. Are engaged with each other, the rotor cannot be rotated even if the tumbler is pressed down by using a jig or the like, and therefore, theft does not occur.

[Brief description of the drawings]

FIG. 1 is a front sectional view of a cylinder lock according to an embodiment of the present invention, and FIG.
FIG. 3 is a front sectional view showing a state in which the key according to the embodiment of the present invention is inserted, FIG. 3 is a sectional view taken along line AA of FIG. 1, FIG. 4 is a sectional view taken along line BB of FIG. FIG. 6 is a front sectional view showing a state in which a key of the conventional example is inserted, FIG. 7 is a sectional view taken along line CC of FIG. 5, and FIG. 8 is a line DD of FIG. It is sectional drawing. 1.7 Holder, 2 Rotor, 3 Keyway, 4
…… Spring, 5.8… Tumbler, 6 …… Key,
7c: Tooth, 8c: Tooth.

Claims (1)

(57) [Claims] A plurality of tumblers which are spring-biased in a direction protruding from the outer periphery of the rotor and are slidably inserted into grooves of the rotor; In a cylinder lock, which protrudes into a groove to disable rotation of the rotor and is immersed in the rotor when a key is inserted to enable rotation of the rotor, each of the tumblers and the inner peripheral surface of the holder are separately provided. A toothed portion is formed at a contact portion of the cylinder lock so that each toothed portion is engaged when the key is removed.