JP3654848B2 - Cylinder lock - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cylinder lock using a tumbler made of a plate member, and in particular, using a plate tumbler having the same action as a pin tumbler, which is expensive to manufacture but is difficult to tamper with. The present invention relates to a cylinder lock that can prevent unauthorized unlocking by a picking tool with an inexpensive configuration.
[0002]
[Prior art]
Cylinder locks are widely used for various locks of automobiles and doors of buildings. An example of a conventional configuration of this type of cylinder lock is shown in FIGS. 4 is an exploded perspective view showing a cylinder lock using a tumbler formed of a plate member (hereinafter referred to as a plate tumbler), FIG. 5 is a sectional view taken along line AA in FIG. 4 , and FIG. FIG . 7 is an axial sectional view of the cylinder lock when the key plate is not inserted into the key hole, and FIG. 7 is an axial sectional view of the cylinder lock when the key plate is inserted into the key hole of FIGS. FIG. 8 is a longitudinal sectional view showing a cylinder lock using a tumbler formed of pins (hereinafter referred to as a pin tumbler).
[0003]
4 and 5 , a key hole 2 having a rectangular cross section is formed in the center of the substantially cylindrical rotor 1 so as to penetrate in the axial direction. Four slit-shaped tumbler insertion holes 3 are formed on the outer periphery of the rotor 1 at predetermined intervals in a direction perpendicular to the axial direction. A plate tumbler 4 is inserted into each of these tumbler insertion holes 3 so as to be detachable.
[0004]
A rectangular window portion 4a through which the key plate 5 passes is formed at the center of the plate tumbler 4, and the height h of the window portion 4a is different for each plate tumbler. Further, a step portion 4b is integrally formed on one side of the plate tumbler 4, and two convex portions 4c are integrally formed on the other side. When the four plate tumblers 4 are respectively inserted into the tumbler insertion holes 3, the tumbler springs 6 mounted between the stepped portions 4 b and the locking portions 1 a formed on the inner surface of the tumbler insertion holes 3 of the rotor 1 are used. The plate tumbler 4 is urged in a direction protruding from the outer periphery of the rotor 1. As shown in FIG. 5 , the movement range of the plate tumbler 4 is restricted by the convex portion 4 c being guided in the guide groove 1 b formed in the inner surface of the tumbler insertion hole 3 of the rotor 1.
[0005]
As shown in FIG. 4 , a notch 5a is formed on one side of the key plate 5 at a position that aligns with each plate tumbler 4 when the key plate 5 is inserted into a predetermined position in the key hole 2. The depth of 5a corresponds to the height h of the window portion 4a of each plate tumbler 4 respectively. When the key plate 5 is not inserted into the key hole 2 of the rotor 1, the plate tumbler 4 protrudes from the outer periphery of the rotor 1 and is formed on the inner periphery of the lock case 7 that accommodates the rotor 1 as shown in FIG. The rotation is locked by fitting into the stopper 7a.
[0006]
In a state in which the key plate 5 is inserted into the key hole 2 of the rotor 1, the window portion 4 a of the plate tumbler 4 is fitted into the notch portion 5 a of the key plate 5 as shown in FIG. The plate tumbler 4 is released from the locking portion 7 a of the lock case 7 by being pushed down against the urging force. As a result, the rotor 1 can rotate with respect to the lock case 7.
[0007]
As shown in FIG. 8, a cylinder lock using a pin tumbler has a cylindrical rotor 11 rotatably accommodated in a lock case 12, and a key plate 14 is removably inserted into a central key hole 13. ing. The rotor 11 is formed with four round hole-shaped tumbler insertion holes 15 perpendicular to the axial direction in a straight line at predetermined intervals, and pin tumblers 16 having different lengths are inserted in the insertion holes 15 in the axial direction. It is inserted movably.
[0008]
Each of the lock cases 12 is formed with a driver pin insertion hole 17 penetrating at a right angle in the axial direction at a position aligned with the tumbler insertion hole 15 of the rotor 11. Each insertion hole 17 has a cylindrical shape. A driver 18 is inserted. The driver 18 is pressed against the pin tumbler 16 by a spring 20 that is mounted between the driver 18 and a cover 19 that covers the lock case 12. Reference numeral 21 denotes a stopper pin that regulates the position of the lock case 12 in the axial direction.
[0009]
In the cylinder lock configured as described above, when the key plate 14 is not inserted into the key hole 13 of the rotor 11, the driver 18 is pushed by the spring 20 and inserted into the tumbler insertion hole 15 of the rotor 11. Yes. In this state, the rotor 11 cannot rotate. When the key plate 14 is inserted into the key hole 13 as shown in FIG. 8 , the pin tumbler 16 is fitted into the notch 14 a of the key plate 14 and pushed up. As a result, the engagement between the driver 18 and the tumbler insertion hole 15 is released, and the rotor 11 can rotate. At this time, by properly maintaining the relationship between the length of the pin tumbler 16 and the depth of the notch portion 14 a of the key plate 14, the lower ends of the four drivers 18 can be aligned with the outer peripheral surface of the rotor 11.
[0010]
[Problems to be solved by the invention]
In the cylinder lock using the conventional plate tumbler 4 configured as described above, since the lower side of the window portion 4a of the plate tumbler 4 is arranged on a straight line in the axial direction of the rotor 1, an incorrect answer by the picking tool is obtained. It was easy to lock. Further, since the notch 5a is formed only on one surface of the key plate 5, the arrangement of the plate tumblers 4 is restricted, and only four normal plate tumblers are used. This has also been a cause of easy unauthorized unlocking. Further, in the cylinder lock using the conventional pin tumbler 16 shown in FIG. 8 , there is an advantage that it takes time for unauthorized unlocking by the picking tool by forming the tip of the pin tumbler 16 in a substantially hemispherical shape. However, since the pin tumblers 16 are arranged in a straight line, the number of the pin tumblers 16 is restricted, which is a drawback of preventing unauthorized unlocking. Further, the pin tumbler 16 has a drawback that the manufacturing cost is increased.
[0011]
The present invention has been made in view of such a situation, and an object thereof is to provide an inexpensive cylinder lock that can prevent unauthorized unlocking by a picking tool or the like.
[0012]
[Means for Solving the Problems]
To achieve the above object, the present invention comprises a lock case, a rotor rotatably inserted in the lock case, and a plurality of rotors formed in a direction perpendicular to the axial direction of the rotor. In the state where the key plate is not inserted into the key hole formed in the axial direction of the rotor, the tumbler is disposed on the inner side of the lock case. The rotor protrudes to restrain the rotor against rotation with respect to the lock case, and when the key plate is inserted into the key hole of the rotor, the tumbler retreats from the inner surface of the lock case to release the restraint of the rotor. In the cylinder lock, a plurality of recesses having different diameters and depths are formed at different positions in the length direction and width direction of at least one surface of the key plate, Formed in the above On one side of the window portion through which the plate is inserted, there is provided a protruding portion having a substantially hemispherical tip that can be engaged with one of the recessed portions formed in the key plate, and the protruding portion is engaged with the recessed portion. The tumblers are retracted from the inner surface of the lock case when they are combined.
[0013]
According to said structure, the position of the protrusion part provided in the window part of the board tumbler is each aligned with one of the several recessed part formed in the different position of the arbitrary surfaces of a key board, and a protrusion part is a recessed part. Since each plate tumbler is retracted from the inner surface of the lock case when engaged, the degree of freedom in arranging the plate tumblers can be increased and the number of tumblers can be increased. In addition, since the protruding portion has a substantially hemispherical tip, and thus has the same function as a pin tumbler that requires time for unauthorized unlocking, unauthorized unlocking with a picking tool can be performed with an inexpensive configuration. Can be prevented.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a configuration example of an embodiment of the present invention will be described with reference to the drawings. In the configuration examples shown in FIGS . 1 to 3 , the same reference numerals are given to the portions corresponding to the portions of the conventional example shown in FIGS. 4 to 8 , and description thereof will be omitted as appropriate.
[0015]
FIG. 1 is an exploded perspective view showing a first configuration example of the present invention, and shows a case where the number of plate tumblers 4 is four. The configuration of the rotor 1 is substantially the same as that of the conventional example shown in FIG. 4, and the positions of the protruding portions 4 d formed on one side of the window portion 4 a of the plate tumbler 4 are different. The positions of the recesses 5a formed in the key plate 5 are also different in the length direction and the width direction. When the key plate 5 is inserted into the key hole 2, the protruding portions 4d formed on the respective plate tumblers 4 and having a substantially hemispherical tip are engaged with the concave portions 5a at the corresponding positions. The operation is the same as in the conventional example. Here, as is apparent from FIG. 1, the protruding portion 4 d in the present configuration example has a substantially hemispherical tip, thereby making the front shape substantially the same as the front shape of the pin tumbler. . Therefore, the protruding portion 4d according to this configuration example has the same action as a pin tumbler that requires time for unauthorized unlocking by picking. On the other hand, unlike the pin tumbler, the manufacturing cost can be suppressed. The cylinder lock according to the example can prevent unauthorized unlocking by the picking tool with an inexpensive configuration.
[0016]
FIG. 2 is an exploded perspective view showing a second configuration example of the present invention, and FIG. 3 is a cross-sectional view taken along line AA of FIG. In the present configuration example, the number of plate tumblers 4 is 4 in the upper part and 4 in the lower part in total, and each of the four plate tumblers 4 is formed by inserting four tumblers formed on the upper and lower surfaces of the outer periphery of the rotor 1. This is the case of inserting into the hole 3. Also in this case, the positions of the protruding portions 4d formed on one side of the window portion 4a of the plate tumbler 4 are different. Further, concave portions 5a are formed at positions facing the protruding portions 4d of the respective plate tumblers 4 on both sides of the key plate 5, and when the key plate 5 is inserted into the key hole 2, the protruding portions 4b of the respective plate tumblers 4d are formed. It engages with the concave portions 5a at the positions facing each other.
[0017]
Although the operation of this configuration example is the same as that of the conventional example, since the number of plate tumblers 4 is as many as eight, unauthorized unlocking with a picking tool or the like becomes more difficult. In addition, as is apparent from FIG. 3, the protruding portion 4d in the present configuration example has a substantially hemispherical tip, and the front shape thereof is substantially the same as the front shape of the pin tumbler. Therefore, like the protruding portion 4d in the cylinder lock shown in FIG. 1, it has the same action as a pin tumbler that requires time for unauthorized unlocking by picking. On the other hand, unlike the pin tumbler, the manufacturing cost can be suppressed and the cost is low. With this configuration, a cylinder lock that can prevent unauthorized unlocking by the picking tool can be obtained. Note that the number of the plate tumblers 4 is not limited to eight, and may be any other number if possible in design.
[0018]
【The invention's effect】
As described above, according to the cylinder lock of the present invention, a plurality of recesses having different diameters and depths are formed at different positions on at least one surface of the key plate, and the position and shape of the tumbler inserted into the rotor are set as described above. Since it is formed to be engageable with the recess, the number of tumblers can be increased, and unauthorized unlocking by a picking tool or the like can be prevented. In addition, the projecting portion to be engaged with the concave portion has a substantially hemispherical tip, and thus has the same function as a pin tumbler that requires time for unauthorized unlocking, so it is less expensive than a pin tumbler. Moreover, it is possible to prevent unauthorized unlocking similar to a pin tumbler.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view showing a first configuration example of an embodiment of a cylinder lock of the present invention.
FIG. 2 is an exploded perspective view showing a second configuration example of the present invention.
3 is a cross-sectional view taken along line AA in FIG.
FIG. 4 is an exploded perspective view showing a configuration example of a cylinder lock using a conventional plate tumbler.
5 is a cross-sectional view taken along line AA in FIG.
6 is an axial sectional view showing a state when a key plate is not inserted into the cylinder lock of FIG.
7 is an axial sectional view showing a state when a key plate is inserted into the cylinder lock of FIG. 5. FIG.
FIG. 8 is an axial sectional view showing a configuration example of a cylinder lock using a conventional pin tumbler.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Rotor 2 Key hole 3 Tumbler insertion hole 4 Plate tumbler 4a Window part 4d Protrusion part 5 Key plate 5a Concave part 7 Lock case

Claims (1)

A lock case,
A rotor rotatably inserted in the lock case;
A plate-shaped tumbler that is removably inserted in a plurality of tumbler insertion holes formed in a direction perpendicular to the axial direction of the rotor,
In a state in which the key plate is not inserted into the key hole formed in the axial direction of the rotor, the tumbler protrudes toward the inner surface side of the lock case and restrains the rotor so as not to rotate with respect to the lock case. In the cylinder lock in which the tumbler is retracted from the inner surface of the lock case to release the restraint of the rotor when the key plate is inserted into the key hole,
A plurality of recesses having different diameters and depths are formed at different positions in the length direction and width direction of at least one surface of the key plate, and the key plate is formed at substantially the center of the tumbler. When one of the window portions is provided with a protrusion that has a substantially hemispherical tip, which can be engaged with one of the recesses formed on the key plate, the protrusion engages with the recess. A cylinder lock characterized in that each tumbler is retracted from the inner surface of the lock case.

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