JPH0319580Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to an improvement of a cylinder lock in which a plurality of disc tumblers are arranged in tandem on a rotor within the cylinder lock.

Conventional technology Conventionally, this type of cylinder lock has a disc tumbler (hereinafter referred to as tumbler) in through holes formed at intervals in the rotor, and this tumbler is locked in a vertical groove formed in the inner wall of the cylinder lock case. It is inserted with a biased spring to make it work.

When the duplicate key is inserted into the key insertion hole of the rotor, each tumbler biased by the spring comes out of the longitudinal groove and sinks into the rotor, and the rotor freely rotates with the rotation of the key, allowing it to be locked or unlocked. The operation is performed.

Problems that the invention aims to solve: As mentioned above, each tumbler biased by a spring is engaged in a vertical groove formed in the case, so the rotor cannot be rotated with anything other than a duplicate key. However,
If an unauthorized tool, such as a thin wire or a thin plate, is inserted into the key insertion hole and the rotor is urged in the unlocking direction while repeating the sliding operation, the top edge a of the tumbler will move to the corner edge b of the vertical groove. (See Figure 3)
Therefore, there is a drawback that if all the tumblers are locked by unauthorized operation, the rotor will be rotated in the unlocking direction.

Means for solving the problem A vertical groove is formed in the case of the cylinder lock and the inner wall surface of this case, and a plurality of sawtooth grooves are formed along the vertical groove and in the circumferential direction, and the cylinder lock is inserted into the case and is spaced apart. A rotor with a through hole formed therein, a spring fitted into the through hole of the rotor and biasing each tumbler, a tumbler biased by the spring, a key insertion hole formed in the center of the tumbler, and an outer peripheral side portion. A plurality of serrations are formed on the tumbler, and when each tumbler is operated with an unauthorized tool, the serrations and the serration grooves are sequentially engaged with each other.

Effect: An unauthorized tool was inserted into the rectangular key (not shown) insertion hole formed in the center of multiple tumblers installed in the rotor, and this tool resisted the spring that constantly biased each tumbler. When the tumblers are pushed down into the rotor, the saw teeth formed on the outer circumferential side of each tumbler are sequentially locked in the saw tooth grooves formed on the case from the beginning, so the rotor can be rotated while sequentially releasing these locks. Must.

Example Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a longitudinal sectional view of the main parts of the present invention, in which 1 is a cylinder lock case, 2 is a rotor rotatably inserted into this cylinder lock case, and a plurality of rotors are installed at intervals on this rotor. A tumbler 3 is formed with through holes 2', and a rectangular key insertion hole 3' is formed in the center of these through holes 2'.
The spring 4 always urges the tumbler 3 toward the outer circumferential side of the rotor 2, and the tumbler 3 is engaged in the vertical groove 1' formed on the inner wall surface of the case 1. For operations other than the duplicate key, it is always locked in this vertical groove 1'.

FIG. 2 is a longitudinal side view of a conventional conventional lock, in which 1 is a case of a cylinder lock, 2 is a rotor, and 3 is a tumbler that is fitted together with a spring 4 into a plurality of through holes 2' formed in the rotor 2. It is. This spring 4 comes into contact with the protrusion 3'' of the tumbler 3 and biases it. Also, a rectangular key insertion hole 3' is formed in the center of the tumbler 3, and the tumbler 3 is provided with a rectangular key insertion hole 3'.
A plurality of saw teeth 3b are formed on the outer circumferential side 3a. Further, a plurality of sawtooth grooves 1a are formed in the circumferential direction along the vertical grooves 1' formed on the inner wall surface of the case 1, so that the sawtooth grooves 1a are successively engaged with these sawtooths 3b when the lock is illegally unlocked.

Therefore, when using a duplicate key, all tumblers 3
However, when rotating the rotor 2 with an unauthorized tool, the saw teeth 3b of each tumbler 3 are sequentially engaged with the saw tooth grooves 1a of the case 1 from the beginning, so the rotor 2 The rotation operation is troublesome and cannot be easily rotated.

Effects of the Invention As described above, the present invention provides that when the rotor is rotated in the unlocking direction with an unauthorized tool, the plurality of serrations formed on the tumbler and the plurality of serration grooves formed on the case each Since the locks are sequentially locked, it takes time to rotate the rotor while sequentially releasing the locks, so this has the effect of significantly improving theft prevention performance.

[Brief explanation of the drawing]

The figure shows the prior art and the embodiment of the present invention.
The figure is an enlarged cross-sectional view of the present invention, FIG. 2 is a vertical cross-sectional view with a part of the cylinder lock cut away, and FIG. 3 is an enlarged cross-sectional view of a conventional cylinder lock. 1...Case, 1'...Vertical groove, 1a...Sawtooth groove, 2...Rotor, 2'...Through hole, 3...Tumbler, 3b...Sawtooth, 4...Spring.

Claims (1)

[Scope of utility model registration request] A cylinder lock case and a rotor having a vertical groove formed on the inner wall surface of the case, a plurality of sawtooth grooves formed along the vertical groove and in the circumferential direction, and inserted into the case and having through holes formed at intervals. A spring is inserted into the through hole of the rotor and biases each tumbler, a tumbler is biased by the spring, a key insertion hole is formed in the center of the tumbler, and a plurality of saw teeth are formed on the outer circumferential side of each tumbler. A cylinder lock characterized in that when the tumbler is operated with an unauthorized tool, the serrations and the serration grooves are sequentially locked.