JP2003138796A - Cylinder lock - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cylinder lock having high resistance to picking. SOLUTION: This cylinder lock allows and prohibits rotary operation to a rotor 2 by moving a tumbler 1 to a prescribed position in the rotor 2 by an unlocking code forming recessed part 6 arranged on a surface of a blade part 5 of an inserted key plate 4 by inserting and forming the rotor 2 having the tumbler 1 in a case 3. The rotor 2 is provided with a foreign matter detecting tumbler 7 freely movable in the moving direction of the tumbler 1, and having one end positioned on a rotary boundary surface to the case 3 of the rotor 2 when the key plate 4 is not inserted. The foreign matter detecting tumbler 7 is provided with a detecting projection 9 fitted to an engaging groove 8 recessed on a side wall surface of the key plate 4, and holding the foreign matter detecting tumbler 7 in a position when the key plate 4 is not inserted even in a state of inserting the key plate 4. The foreign matter detecting tumbler 7 is arranged so that the detecting projection 9 is energized inside the rotor 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylinder lock.

[0002]

2. Description of the Related Art As a cylinder lock having improved resistance to picking and the like, one disclosed in Japanese Patent No. 2519283 is known. In this conventional example, a locking member that can be inserted into an engaging hole formed in the inserted key plate is biased toward the inner side of the rotor at the tip of the rotor.

The locking member is formed so that one end thereof is positioned on the rotation boundary surface of the rotor when the key plate is not inserted, and when a jig or the like is used to operate the tumbler in the rotor, the locking member causes the case to move. It is pushed to the side and crosses the rotation boundary surface to prohibit the rotation of the rotor.

However, this conventional example has the following drawbacks because the locking member is held in the key plate uninserted position by penetrating the locking member through the engagement hole of the key plate. That is, the size of the locking member is related to the ability to detect foreign matter insertion, and if the size is such that the insertion groove of the key plate opened in the rotor is completely closed, foreign matter insertion becomes difficult, and conversely If the member is small, the picking operation that avoids contact with the locking member becomes easy.

On the other hand, the engagement hole on the key plate side needs to have a size through which the locking member can pass. However, the larger the locking member, the less the key plate remains and the strength becomes smaller. The large engagement hole cannot be formed in the blade portion where the unlocking code forming concave portion is formed, and it is necessary to form the large engagement hole in the wide width portion that follows the blade portion (in the present specification, “blade”). "Part" refers to a region in the key plate where the unlocking code forming recess is formed.).

However, when the engaging hole is formed in the portion other than the blade portion as described above, the corresponding locking member is arranged at a position separated from the tumbler in the rotor, and as a result,
For example, it is easy to illegally operate the tumbler while avoiding interference with the locking member by using a jig or the like having an opening through which the locking member penetrates and capable of operating the tumbler.

A key plate having an unlocking code formed on the surface of the blade is disclosed, for example, in JP-A-11-1.
The one described in Japanese Patent No. 3318 is known. In this conventional example, two unlocking code forming recesses are formed on the surface of the blade portion, and when inserted into a cylinder lock, the tumbler inside the rotor follows the unlocking code forming recesses. It is driven to a predetermined position in the rotor. When the unlock code forming recess matches the unlock code preset in the cylinder lock, the end of the tumbler 1 moves to the rotation boundary surface between the rotor and the case, and the rotor can be rotated.

Further, in the above-mentioned conventional example, as shown in FIG. 9 of the same publication, engraving of the unlocking code forming concave portion on the surface layer of the blade portion is performed with the side of the key plate being XY.
It is performed using an end mill type milling cutter while restrained on the table.

However, in such a conventional example, there is a problem that the blade portion is likely to resonate during processing and the cutter life is shortened. In particular, when the groove width of the unlock code forming recess is small, it is necessary to use a cutter having a small diameter, so that the life is further shortened and it becomes difficult to position the unlock code forming recess 6. There is a problem.

[0010]

SUMMARY OF THE INVENTION The present invention has been made to solve the above drawbacks, and an object of the present invention is to provide a cylinder lock having high resistance to picking.

Another object of the present invention is to provide a key plate and an accurate key plate processing method in which an unlock code forming recess can be easily formed in the key plate.

[0012]

According to the present invention, the above object is achieved by inserting the rotor 2 having the tumbler 1 into the case 3 and inserting the blade portion 5 of the inserted key plate 4.
The tumbler 1 is moved to a predetermined position in the rotor 2 by an unlocking code forming concave portion 6 provided on the surface of the rotor 2
A cylinder lock that allows and prohibits a rotation operation on the rotor 2. The rotor 2 is movable in the moving direction of the tumbler 1, and one end of the rotor 2 is positioned on the rotation boundary surface of the rotor 2 with respect to the case 3 when the key plate 4 is not inserted. The foreign matter detection tumbler 7 is disposed, and the foreign matter detection tumbler 7 is fitted into the engagement groove 8 recessed in the side wall surface of the key plate 4, and the foreign matter detection tumbler is inserted even when the key plate 4 is inserted. 7 is provided with a detection projection 9 for holding the key plate 4 in a position when the key plate 4 is not inserted, and the foreign matter detection tumbler 7 provides a cylinder lock arranged so that the detection projection 9 is biased inward of the rotor 2. It is achieved by

A blade portion 5 is provided on the rotor 2 of the cylinder lock.
The tumbler 1 is moved to a predetermined position in the rotor 2 by the unlocking code forming recess 6 formed in the above, and the foreign matter detecting tumbler 7 is provided. In the tumbler 1, the unlocking code forming recess 6 is a regular unlocking code. If both ends of the rotor 2 are located on the rotation boundary surface of the rotor 2, the rotation operation to the rotor 2 is allowed (in this way, the tumbler 1 or the foreign matter detection tumbler 7 is placed on the rotation boundary surface of the rotor 2). A position where one end of the rotor 2 is located and the rotor 2 can be rotated is referred to as a "shear line forming position".

On the other hand, the foreign matter detection tumbler 7 is biased toward the center of the rotor 2 so as to occupy the shear line forming position when the key plate 4 is not inserted, and the foreign matter is inserted into the rotor 2 to tumbler. When the user tries to operate 1, the foreign matter detection tumbler 7 moves from the shearline formation position even if the tumbler 1 is moved to the shearline formation position by a picking operation because the foreign matter moves from a predetermined position due to the foreign matter. The rotor 2 cannot be rotated.

The detection projection 9 provided on the foreign matter detection tumbler 7 is fitted into the engagement grooves 8 formed on both side walls of the blade portion 5 when the blade portion 5 is inserted, so that the key plate 4 is Even if the key plate 4 is inserted, the key plate 4 is held at the position where the key plate 4 is not yet inserted, that is, the shear line forming position, and only when foreign matter other than the setting key plate 4 is inserted, the key line 4 moves from the shear line forming position to the rotor 2. Prohibit rotation operation.

By forming the engaging groove 8 for avoiding the foreign matter detecting tumbler 7 in the side wall portion of the blade portion 5, it is not necessary to consider the decrease in strength due to the formation of the engaging groove 8, so that the foreign matter is eliminated. The detection tumbler 7 can be arranged close to the tumbler 1. Generally, in the picking operation, when a jig or the like is inserted into the rotor 2 and the tumbler 1 is illegally operated, the jig or the like is reciprocally moved in the longitudinal direction of the rotor 2 while applying a rotational force to the rotor 2 to move the tumbler 1 Although it is performed by moving to the shear line position, since the foreign matter detection tumbler 7 is arranged close to the tumbler 1, it becomes extremely difficult to operate only the tumbler 1 while avoiding interference with the foreign matter detection tumbler 7. , Picking operation becomes impossible.

A key plate 4 suitable for the cylinder lock
As the blade portion 5, a blade portion having an engaging groove 8 in the center of the side wall surface can be used.
The unlocking code forming concave portion 6 can be formed on the surface of the blade portion 5 in a state in which the restraining protrusions 10 are fitted into the engaging grooves 8 formed on both side wall surfaces of the blade portion 5 to regulate the movement in the plate thickness direction.

With this structure, when the unlocking code forming recess 6 is provided on the surface of the key blade, both side edges are prevented from moving in the plate thickness direction and fluttering by the projections on the supporting table side. In addition, the position of the unlocking code forming recess 6 can be accurately regulated, and the accuracy can be improved. Further, since the key blade does not vibrate even when the unlocking code forming concave portion 6 is processed, even if a small diameter end mill type milling cutter is used, the cutter will not be broken and the cutter life can be extended. This makes it possible to form the unlocking code forming recess 6 having a narrow width.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of the present invention. In the figure, 3 is a case, and 2 is a rotor rotatably inserted in the case 3.

The rotor 2 has a key plate insertion groove 2a formed longitudinally therethrough, and the key plate insertion groove 2a is formed.
A plurality of tumbler grooves 2b are formed at a predetermined pitch so as to be orthogonal to. A plate-shaped tumbler 1 is slidably mounted in the tumbler groove 2b, and is interposed between a spring seat 2c formed on the tumbler groove 2b side and a spring receiver 1a formed on the tumbler 1. One end of the tumbler spring 11 is urged in the engagement direction with the lock groove 3a on the inner wall surface of the case 3.

The key plate 4 for rotating the rotor 2 is formed by extending a blade portion 5 from one end of a head portion 4a, as shown in FIG. The blade portion 5 has a predetermined plate thickness (t), and the engaging groove 8 is formed on both side walls (cutting edge surface) thereof. As will be described later, the engagement groove 8 is formed so that the front and back can be used or the front and back can be processed.
The center C8 in the width direction is the center line C4 of the plate thickness of the key plate 4.
Placed to match.

An unlocking code forming concave portion 6 is formed on the surface of the blade portion 5. As shown in FIG. 2 (b), the unlocking code forming concave portion 6 is formed by cutting the surface of the blade portion 5, and further, on the front and back surfaces of the blade portion 5, the cross-section center is formed so that it can be used upside down. It is formed at a point symmetrical position with respect to (see FIG. 2C).

Therefore, in this embodiment, the tumbler 1 is engaged with the lock groove 3a on the case 3 side by the urging force of the tumbler spring 11 when the key plate 4 (blade portion 5) is not inserted. As shown in (b), the rotating boundary surface of the rotor 2 with respect to the case 3 is closed by the tumbler 1, so that the rotating operation of the rotor 2 is prohibited. When the key plate 4 is inserted from this state, the key reading protrusion 1c protruding toward the center from the key insertion opening 1b formed in the central portion of the tumbler 1 fits into the unlocking code forming concave portion 6 and the predetermined inside of the rotor 2 is obtained. Held in position. As shown in FIG. 1C, when the unlock code forming concave portion 6 on the key plate 4 side has a set value, the tumbler 1 moves to a shear line forming position where both ends are located on the rotation boundary surface of the rotor 2. The rotation of the rotor 2 is allowed.

In order to improve the picking resistance of the cylinder lock constructed as described above, a foreign matter detecting tumbler 7 is mounted on the cylinder lock. The foreign matter detection tumbler 7
As shown in FIG. 1A, the tumbler 1 is formed of a plate material, and is urged toward the outside of the rotor 2 by a tumbler spring 11. A stopper 7a which also serves as a spring is bulged on the top of the foreign matter detection tumbler 7, and the stopper 7a abuts the inner peripheral wall surface of the case 3 when the key plate 4 is not inserted. In this state, the other end of the foreign matter detection tumbler 7 is located on the rotation boundary surface of the rotor 2, and the rotor 2 can be rotated under the condition that the tumbler 1 is in the shear line forming position.

Further, the foreign matter detecting tumbler 7 is provided with a detecting projection 9 protruding from the key insertion opening 1b. As shown in FIG. 3 (b), the detection protrusion 9 has the engagement groove 8 of the blade portion 5 when the blade portion 5 is inserted into the rotor 2.
It has a size that can be fitted to. The engaging groove 8 is a detection protrusion 9
Is formed at a depth almost equal to or more than.

Therefore, in this embodiment, as shown in FIG.
As shown in (b), even if the key plate 4 is inserted into the rotor 2, the detection projection 9 of the foreign matter detection tumbler 7 is absorbed by the engagement groove 8 of the key plate 4, so that the foreign matter detection tumbler 7 It does not move in the rotor 2 and is held in the key plate 4 uninserted position, that is, the shear line forming position. On the other hand, as shown in FIG.
The tumbler 1 is caused by a foreign substance 12 other than the predetermined key plate 4.
If the foreign matter detection tumbler 7 moves from the shear line forming position, the rotor 2 cannot be rotated.

In order to effectively prevent the picking operation by the foreign matter 12, it is desirable to dispose the foreign matter detection tumbler 7 close to the tumbler 1 which is the target of the illegal operation.
For example, as shown in FIG.
And the interval (d) between the adjacent tumblers 1 are set to be equal to or less than the interval (p) between the tumblers 1 and 1, and it is possible to place the foreign matter detection tumbler 7 and the tumbler 1 in contact with each other.

FIG. 4 shows a method of processing the above-mentioned key plate 4. Unlock code forming recess 6 on the surface of the blade portion 5
For processing, for example, an end mill type milling cutter can be used. At the time of processing, the key plate 4 is first attached to a fixing jig 13 fixed on a surface plate (not shown). The fixed jig 13 includes a movable block 13a and a fixed block 13b corresponding to both side edges of the blade portion 5, and the movable block 13a and the fixed block 13b have a restraining protrusion 10 that can be engaged with the above-described engaging groove 8. Is projected.

To fix the key plate 4 to the fixing jig, first, the engaging protrusion 8 of the fixing block 13b is fitted into the engaging groove 8 on one side wall of the key plate 4, and then the movable block 1 is moved.
4 (b) and 4 (c), the engaging groove 8 on the opposing wall surface is restrained by moving it in the direction of arrow A, and then the head portion 4a of the key plate 4 is pressed by the pressing fitting 13c. In this state, since both side walls of the blade portion 5 are restrained by the restraining protrusions 10 and vertical vibration is prevented from being generated, the unlocking code forming concave portion 6 on the surface of the blade portion 5 using the processing blade 14 is formed. The engraving work can be performed accurately, and since resonance of the machining blade 14 does not occur, even a machining blade having a small diameter can be used for a long period of time without being easily broken.

[0030]

As is apparent from the above description, according to the present invention, the resistance to picking can be increased.

[Brief description of drawings]

1A and 1B are views showing the present invention, in which FIG. 1A is a sectional view, FIG. 1B is a sectional view taken along line 1B-1B of FIG. 1A in a state where a key plate is not inserted, and FIG. Is.

FIG. 2 is a view showing a key plate, (a) is a side view,
(B) is a view taken in the direction of arrow 2B in (a), and (c) is 2 in (b).
It is a C-2C line sectional view.

FIG. 3 is a diagram showing the operation of the foreign matter detection tumbler, in which (a) is 3A-3 in FIG.
A line sectional view, (b) is a figure which shows the key plate insertion state,
(C) is a figure which shows the foreign material insertion state.

4A and 4B are views showing a method for processing a key plate, in which FIG. 4A is a side view, FIG. 4B is a plan view, and FIG.
It is a line sectional view.

[Explanation of symbols]

1 tumbler 2 rotor 3 cases 4 key plate 5 blade part 6 unlocking code forming groove 7 Foreign object detection tumbler 8 engaging groove 9 Detection protrusion 10 Restraint protrusion

Claims (4)

[Claims] Claim: What is claimed is: 1. A rotor provided with a tumbler is formed by inserting it into a case, and the tumbler is moved to a predetermined position in the rotor by an unlocking code forming recess provided on the surface of the blade portion of the inserted key plate. A cylinder lock for permitting and prohibiting rotation operation on the rotor, wherein the rotor is movable in the moving direction of the tumbler and has one end located on the rotation boundary surface with respect to the case of the rotor when the key plate is not inserted. The foreign matter detection tumbler is arranged, and the foreign matter detection tumbler is fitted into the engaging groove formed in the side wall surface of the key plate, and the foreign matter detection tumbler is inserted even when the key plate is not inserted. A detection protrusion that holds the position is provided, and the foreign matter detection tumbler is arranged so that the detection protrusion is biased inward of the rotor. Linda tablets. 2. The distance between the foreign matter detection tumbler and an adjacent tumbler is at least approximately the same as the distance between the tumblers,
The cylinder lock according to claim 1, which is smaller than this. 3. A key plate according to claim 1, wherein an engagement groove into which the detection protrusion of the cylinder lock can be fitted is formed in a central portion of a side wall surface of the blade portion. 4. A key plate in which an unlocking code forming concave portion is formed on the surface of the blade portion in a state in which a restraining protrusion is fitted in engaging grooves formed on both side wall surfaces of the blade portion to restrict movement in the plate thickness direction. Processing method.