JPH0319581Y2 - - 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 Problems The purpose of the present invention is to eliminate the above-mentioned drawbacks by forming a vertical groove in the case of the cylinder lock and the inner wall surface of the case, and forming a plurality of one-sided grooves along the vertical groove and in the circumferential direction. A rotor is inserted into the case and has through holes formed at intervals, a spring is fitted into the through hole of the rotor and urges each tumbler, and the spring is attached to the rotor. When each tumbler is rotated in one direction with an unauthorized tool, a key insertion hole is formed in the center of the tumbler, and a plurality of saw teeth are formed on the outer peripheral side with an inclined surface in one direction. The sawtooth and the sawtooth groove are sequentially locked, and when the tumbler is rotated to the other side, the sawtooth forming an inclined surface in one direction of the tumbler slides on the inclined surface in one direction of the sawtooth groove. is to provide.

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 was used to force each tumbler against the spring that was constantly biased. When the tumblers are pushed down into the rotor, the saw teeth formed on the outer peripheral side of each tumbler are sequentially engaged with the saw tooth grooves formed on the case from the beginning, and the tumblers inside the rotor are pushed down in the opposite direction. When the tumbler is rotated, the serrations on the inclined surface in one direction of the tumbler slide against the spring on the upper surface of the sawtooth groove on the inclined surface in one direction on the case of the cylinder lock, and are returned to the original position.

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

FIG. 1 is an enlarged cross-sectional view of the present invention, in which 1 is a case of a cylinder lock, 2 is a rotor rotatably inserted into the case of this cylinder lock, and a plurality of rotors are arranged at intervals on this rotor. A through hole 2' is formed,
A tumbler 3 with a rectangular key insertion hole 3' formed in the center and a spring 4 that comes into contact with and biases a protrusion 3'' formed on the tumbler 3 are fitted into these through holes 2', respectively. This 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. It is always locked in the vertical groove 1'.

Further, a rectangular key insertion hole 3' is formed in the center of the tumbler 3, and a plurality of saw teeth 3b each having an inclined surface in one direction are formed on the outer peripheral side 3a of the tumbler 3. In addition, when the lock is illegally unlocked, a sawtooth groove 1a having an inclined surface in one direction that sequentially engages with these sawtooths 3b is formed along the vertical groove 1' formed on the inner wall surface of the case 1 and in the circumferential direction. Multiple forms are formed.

Therefore, in the present invention, when a duplicate key is used, all the tumblers 3 are sunk into the rotor 2, but when the rotor 2 is rotated with an unauthorized tool, the serrations 3b of each tumbler 3 are turned in sequence from the beginning. It locks into the sawtooth groove 1a of the case 1.

Effects of the invention As described above, in the present invention, when the rotor is rotated using an unauthorized tool, the saw teeth of each tumbler are sequentially engaged with the saw tooth grooves of the case from the beginning, so that the rotor cannot be rotated. Since it is cumbersome and cannot be easily rotated, it not only has excellent theft prevention properties, but also has an inclined surface in one direction that makes it easy to rotate in the other direction.
This has the effect that it is not troublesome to return to the original position.

[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 vertical groove is formed in the case of the cylinder lock and the inner wall surface of the case, and along the longitudinal groove, a plurality of serrated grooves are formed with an inclined surface on one side in the circumferential direction, and the grooves are inserted into the case and spaced apart. A rotor with a through hole formed therein, a spring fitted into the through hole of the rotor and urging each tumbler, a tumbler urged by the spring, a key insertion hole formed in the center of the tumbler, and a key insertion hole formed in the outer peripheral side. When each tumbler is formed with a plurality of serrations each having an inclined surface in one direction and is rotated in one direction with an unauthorized tool, the tumbler is sequentially engaged with the serration groove and rotated in the other direction. A cylinder lock characterized in that saw teeth forming an inclined surface in one direction of a tumbler slide on an inclined surface in one direction of a sawtooth groove.