JPH03137375A - Cylinder lock - Google Patents

Abstract

PURPOSE:To prevent undue unlocking by equipping each tumbler with a key insert hole in the position corresponding to the height of key ridge, and providing these tumblers with differently positioned contacting parts which restrict the amount of protrusion. CONSTITUTION:A plurality of tumblers 8 are energized by a spring 4 and inserted slidably in a groove 3 provided in a rotor 2. When key is pulled off, the tumblers 8 protrude into a groove 3 from the peripheral surface 2a of the rotor 2 to turn it out of capability of rotating, and when the key is inserted, the tumblers 8 are immerged in the rotor 2 to make it rotatable. In this cylinder lock, the tumblers 8 shall be of such different types that the key insert holes are formed in the positions corresponding to the respective heights of key ridge. The tumblers 8 also have differently positioned contacting parts which restrict the amount of protrusion from the rotor 2 while contacting the inside surface 7b of the holder 7. Thereby the rotor is hindered from rotating even though the tumblers 8 are depressed by the use of any jig etc.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a tumbler-type cylinder lock in which it is difficult to read the height of the tumbler and produce a duplicate key.

(Prior Art) For example, cylinder locks that are widely used in automobile doors, key switch parts, building doors, etc. have a rotatable rotor inside the holder and a plurality of tumblers inside this rotor. When the key is removed, the tumbler protrudes into the groove on the inner circumferential surface of the holder, making it impossible to rotate the rotor, and when the key is inserted, the tumbler is recessed into the rotor, allowing the rotor to rotate. is being used.

5 to 8 show examples of the conventional structure of this type of cylinder lock. A rotor 2 is rotatably housed in a holder 1, and a spring 4 is inserted into a keyway 3 of the rotor 2. A tumbler 5 biased by the spring 4 in a direction protruding outward from the outer periphery 2a of the rotor 2 is slidably accommodated therein. When the key 6 is removed and removed, the locking part 5b of the tumbler 5 is moved from the outer peripheral surface 2a of the rotor 2 into the groove lb of the holder 1 at a position where the contact part 5a of the tumbler 5 contacts the inner peripheral surface la of the holder l. It has come to stand out. The amount of protrusion at this time is regulated by the contact portion 5a of the tumbler 5 hitting the inner circumferential surface 1a of the holder 1, but since the external shapes of the plurality of tumblers 5 are all the same, the amount of protrusion is the same size. Become. On the other hand, as shown in FIGS. 7 and 8, the key insertion holes 5c are not provided at the same position but at positions corresponding to the heights of the corresponding key peaks, so that when the key is inserted to the specified position, The key insertion hole 5c is pushed by the key thread 6a of the key 6, the tumbler 5 moves, and the tip of the lock portion 5b is retracted to the outer peripheral surface of the rotor 2.

FIG. 5 is a diagram showing the positions of the tumblers 5 when the key 6 is removed, and the tumblers 5 are arranged in the rotor 2 alternately in opposite directions. And when key 6 is removed,
Each tumbler 5 protruding in the same direction moves to the same position, so that the key insertion hole 5c is in a position corresponding to the key thread 6a. Further, when the key 6 is inserted as shown in FIG. This makes it possible to rotate.

(Problem to be Solved by the Invention) In the case of the above structure, the position of the key insertion hole 5c when the key 6 is removed corresponds to the height of the corresponding key thread 6a. Each tumbler 5 with an endoscope magnifier
A duplicate key can be manufactured by reading the position of the key insertion hole 5C, which compromises the safety of the key. Furthermore, since the amount of movement of each tumbler 5 is the same, for example, from the state shown in FIG. 5b into the groove l on the inner circumferential surface 1a of the holder 1.
There is a possibility that the rotor 2 may be rotated by the so-called picking means in which the key is caused to ride on the end portion 1c on the b side, and this point has also been a factor in reducing the safety of the key.

The present invention has been made in view of the above problems, and is a cylinder designed to prevent theft by reading the height of the tumbler and making it more difficult to produce a duplicate key or unlock it by special means. The purpose is to provide locks.

(Means for Solving the Problems) In order to solve the above problems, the present invention provides a plurality of tumblers that are spring-biased in a direction protruding from the outer periphery of the rotor and are slidably inserted into grooves of the rotor. When the key is removed, this tumbler protrudes from the outer periphery of the rotor into the groove of the holder, making it impossible to rotate the rotor, and when the key is inserted, it sinks into the rotor, allowing the rotor to rotate. In such a cylinder lock, the plurality of tumblers are composed of a plurality of types of tumblers each having a key insertion hole formed at a position corresponding to the height of the key crest, and these plurality of tumblers are arranged on the inner circumference of the holder. The tumbler is comprised of a plurality of tumblers with different positions of abutting portions that abut against the surface and restrict the amount of protrusion from the rotor.

(Function) With the above configuration, when the key is removed,
The amount of protrusion of each tumbler that protrudes in the same direction is a height that is not related to the height of the key ridge, and the position of the key insertion hole is also a position that is not related to the height of the key ridge. Therefore, even if the position of the key insertion hole is detected, the corresponding height of the key crest cannot be determined, making it impossible to manufacture a duplicate key.

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

In the figure, 8 is a tumbler. Also in this embodiment, a rotatable rotor 2 is housed in a holder 7, and a plurality of tumblers 8 are held within this rotor 2. This tumbler 8 is housed in a key groove 3 formed in the diametrical direction of the rotor 2, and a spring 4 inserted between a convex piece 8a protruding from the side and a stepped portion 2b of the rotor 2 moves the rotor 2. is biased in a direction to protrude outward from the outer circumferential surface 2a. When the key 6 is removed or removed, the lock portion 8b of the tumbler 8 protrudes into the groove 7a of the holder 7.

Although the basic structure is not much different from the conventional example, the tumbler 8 in this embodiment has the following structure. That is, each tumbler does not have the same external shape as in the conventional case, but has a toothed portion 8c formed at the contact portion with the inner circumferential surface 7b of the holder 7.
A plurality of positions of this southern part 8C are provided to lock part 8b.
The amount of protrusion is different. That is, although FIGS. 3 and 4 show tumblers for key ridges of the same height, in FIG. 3 the amount of protrusion of the lock portion 8b is small, and in FIG. The position of the tooth portion 8C is set so that A plurality of positions of the tooth portions 8c are set for the tumblers with respect to the key peaks of other heights so that the amount of protrusion of the lock portion 8b is different. Therefore, the position of the key groove 8e when the key is removed is arranged at a position that has no relation to the height of the key 6a.

In addition, in this embodiment, a lower part 7C is formed on the inner circumferential surface 7b side of the holder 7 at the abutting part that comes into contact with the tooth part 8C of the tumbler 8, and when the key 6 is removed, the lower part 7C contacts the tooth part 7C of the holder 7. The tooth portion 8C of the tumbler 8 is biased by a spring 4 into an engaged state. The looseness between the rotor 2 and the tumbler 8 is suppressed within a range in which the tip of the toothed portion 8c of the tumbler 8 cannot overcome the tip of the toothed portion 7c of the holder 7. That is, even if the tumbler 8 is pushed down while the rotor 2 is biased clockwise and the tumbler 8 is biased clockwise and returned, the tip of the teeth 8c of the tumbler 8 will not touch the teeth of the holder 7. The clockwise end of the portion 7c cannot be climbed over.

According to this embodiment, the arrangement of the key insertion holes 8d of the tumbler 8 when the key 6 is removed has no relation to the height of the key thread 6a, so the interior can be seen through the key insertion opening 2c using an endoscope or the like. Even if someone looks into it, the arrangement of the keys will not be recognized.

Further, according to this embodiment, the rotor 2 is
Press either tumbler 8 while biasing it clockwise.
Even if the tumbler 8 is pushed down against the biasing force of the spring 4, the teeth 8c of the other tumblers 8 are engaged with the teeth 7c of the holder 7, so the rotor 2 does not rotate, and the tumbler 8 that is pushed down does not rotate. The southern part 8c cannot get over the toothed portion 7C of the holder 7, and the rotor 2 cannot be rotated.

(Effects of the Invention) As is clear from the explanation below, according to the present invention, when the key is removed, the arrangement of the key insertion holes in the tumbler has no relation to the height of the key thread, so that the internal view is Even if the inside is looked into through the key insertion slot with a magnifying glass or the like, the arrangement of the key piles, etc. will not be recognized, making it impossible to manufacture duplicate keys. Furthermore, since the amount of movement of each tumbler is different, it is difficult to use a jig or the like to push down the tumbler and rotate the rotor. Therefore, the safety of the cylinder lock is improved compared to the conventional one, and unlocking by unauthorized means is prevented, making it possible to prevent damages such as car theft and home invasion.

[Brief explanation of the drawing]

Fig. 1 is a front sectional view of a cylinder lock according to an embodiment of the present invention;
The figure is a front sectional view showing the state in which the key of the embodiment of the present invention is inserted, FIG. 3 is a Δ-A sectional view of FIG. 1, FIG. 4 is a BB sectional view of FIG. 6 is a front sectional view of the conventional example showing the state in which the key is inserted; FIG. 7 is a CC sectional view of FIG. 6; and FIG. It is a diagram. ■・7... Holder, 2... Rotor, 3... Keyway, 4... Spring, 5, 8... Tumbler 16
...Key 7c...teeth, 8c...teeth.

Claims (1)

[Claims] (1) Equipped with a plurality of tumblers that are spring-biased in a direction that protrudes from the outer periphery of the rotor and are slidably inserted into the groove of the rotor, and when the key is removed, the tumblers are inserted into the groove of the holder from the outer periphery of the rotor. In the cylinder lock, the plurality of tumblers are arranged at the height of the key ridge, and the cylinder lock protrudes from the top of the cylinder to prevent the rotor from rotating. It consists of multiple types of tumblers with key insertion holes formed at corresponding positions, and these multiple types of tumblers have different positions of contact parts that contact the inner peripheral surface of the holder and regulate the amount of protrusion from the rotor. A cylinder lock characterized by being composed of multiple tumblers.