JPH04315677A - Cylinder lock - Google Patents

Abstract

PURPOSE:To protect a cylinder lock from breakage by setting a key cylinder to the free rotation state at the time of fraudulent unlocking. CONSTITUTION:When a regular key 11 is inserted into a key cylinder 13, the coupling between a tumbler in the key cylinder 13 and a sleeve 16 is released, and the key cylinder 13 is pressed and rotated relatively to the sleeve 16. A rotor 19 is rotated to a lock position or an unlock position together with a lever 21. When a key of a different kind is inserted into the cylinder 13, the key cylinder 13 is held in the hooked state with the sleeve 16 by the tumbler 14 and rotated together with the sleeve 16. The key cylinder 13 is not moved in the axial direction relatively to the sleeve 16. The key cylinder 13 is not connected to the lever 21 via the rotor 19, and the rotation of the lever 21 is prevented.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to locking devices, and in particular to cylinder locks which have a high resistance to breaking.

0002

BACKGROUND OF THE INVENTION Conventional cylinder locks have a key cylinder with a tumbler that engages in a groove formed in a case, which allows a regular key to be rotated to a locked or unlocked position. In conventional cylinder locks in which the rotation of the key cylinder is prevented by a tumbler that engages with a groove in the case, there is a risk that the tumbler may be broken and the lock may be unlocked illegally. Therefore,
For example, as disclosed in Japanese Unexamined Patent Publication No. 1-315569, a free-turn type cylinder lock has been proposed in which the key cylinder rotates freely in the event of unauthorized unlocking by applying a rotational force to the key cylinder. There is. This cylinder lock includes a sleeve rotatably disposed within a case and a key cylinder rotatably supported within the sleeve. When a regular key is inserted into the key cylinder, the tumbler inside the key cylinder separates from the groove formed in the sleeve, allowing the key cylinder to rotate relative to the sleeve. . This allows the sliding ring to engage with the locking piece actuating member to operate the locking device. Furthermore, when a different type of key is inserted into the key cylinder, the key cylinder rotates together with the sleeve because the key cylinder is held in engagement with the sleeve by the tumbler. As a result, the locking piece actuating member cannot be rotated, so the locking device cannot be operated. In such a free-turn type cylinder lock, the key cylinder rotates freely when different types of keys are used. Therefore, since it is not possible to apply a rotational force that would destroy the tumbler, it is possible to provide a large resistance against destruction.

0003

[Problem to be solved by the invention] By the way, JP-A-1-
The locking device disclosed in Japanese Patent No. 315569 has a drawback that the key cylinder cannot be smoothly rotated after a different type of key is used. That is, there is a rotated key in the locking device.
A torsion spring is provided between the front plate and the key cylinder to automatically return the cylinder to its initial position. When a different type of key is inserted into the key cylinder and the sleeve and key cylinder are freely rotated together, the torsion spring generates a reaction force. However, when the key cylinder is rotated beyond a certain angle, the rotation of the key cylinder is limited by the torsion spring. Therefore, there is a risk that the torsion spring will be damaged or destroyed. However, if the torsion spring is not provided, the key cylinder will not automatically return to its initial position when the key cylinder is rotated using a regular key, resulting in smooth locking or unlocking operations. There is a drawback that it is difficult to Furthermore, in the locking device disclosed in the above-mentioned publication, the sliding ring moves in the axial direction of the cylinder, so that the locking device as a whole becomes larger and has a more complicated structure. SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a cylinder lock which eliminates the above-mentioned drawbacks and allows the key cylinder to rotate completely freely in the event of unauthorized unlocking.

0004

[Means for Solving the Problems] A cylinder lock according to the present invention includes a sleeve rotatably disposed within a case;
It is equipped with a key cylinder that can be engaged with the sleeve by a tumbler and is rotatably disposed within the sleeve, and is capable of handling different types of keys.
When the key cylinder is rotated with
The lever rotates with the lever, preventing the lever from operating. A rotor is provided which is engaged with the key cylinder moved axially inwardly when the regular key is inserted into the key cylinder and rotates together with the lever at the same time. The key cylinder is pressed outward in the axial direction by a spring, and when a regular key is inserted into the key cylinder, the key presses against the spring's elasticity.
The cylinder is moved axially inward. The tumbler projects from the key cylinder and is engaged with the sleeve.

[0005]

[Operation] When a regular key is inserted into the key cylinder, the key
The engagement between the tumbler in the cylinder and the sleeve is released,
The key cylinder can be pressed and rotated relative to the sleeve. When the key cylinder is manually pressed and rotated, the rotor is rotated with the lever into the locked or unlocked position. When the key cylinder is rotated by a different type of key, the key cylinder is held in a locked state with the sleeve by the tumbler, and is rotated together with the sleeve. Therefore, the key cylinder is not axially moved relative to the sleeve. Therefore, the key cylinder is not connected to the lever via the rotor, and rotation of the lever is prevented.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described below with reference to FIGS. 1 to 5. First, as shown in FIGS. 1 to 3, the cylinder lock 10 according to the present invention includes a case 17 and a sleeve rotatably disposed within a hole 17a formed in the case 17.
a sleeve 16 and a key rotatably disposed within the sleeve 16;
It has a cylinder 13. The sleeve 16 has an accommodation hole 16a formed in the length direction, a tumbler groove 23 (FIGS. 2 and 3) formed in the length direction communicating with the accommodation hole 16a, and a die-casting groove. It has a die-cutting hole 24. The key cylinder 13 has a key formed in the length direction.
Groove 13a and a plurality of slots 13b formed in the radial direction
and has. The key cylinder 13 is rotatably disposed within the receiving hole 16a of the sleeve 16. The key cylinder 13 also has a protrusion 13d that can be engaged with the hole 19a of the rotor 19. The plurality of tumblers 14 are
It is disposed so as to be slidable within each slot 13b of the key cylinder 13 and projectable from the key cylinder 13 into the tumbler groove 23 of the outer sleeve 16. The tumbler spring 15 shown in FIG.
3 and the tumbler 14 is placed between the key cylinder 1 and the tumbler 14.
3 to the outside. A guide groove 25 is formed inside the sleeve 16, through which the protrusion 13c of the key cylinder 13 passes. At the front of the case 17 are a key cylinder 13 and a sleeve.
A cap 12 is attached to prevent the tab 16 from falling off. A rotor 19 is provided inside the case 17, and a lever 2 operatively connected to a locking device is attached to the rotor 19.
1 is attached by an E-ring 22. The rotor 19 is provided with a tumbler 14 similar to the key cylinder 13. The tumbler 14 of the rotor 19 is arranged so as to be able to engage with a tumbler groove 17a formed in the case 17. A spring 18 is disposed between the key cylinder 13 and the rotor 19, and the key cylinder 13 is always urged outward. A return spring 20 is disposed in a recess 30 formed in the case 17 to provide elasticity to automatically return the lever 21 to its initial position after the lever 21 is rotated. As shown in Figure 3,
A roller 27 is disposed in a recess 26 formed on the outer surface of the case 17, and the roller 27 is pressed radially inward by a spring 28 disposed inside a plate 29. The roller 27 provides an elastic feel when rotational force is applied to the sleeve 16.

In the above structure, when the key 11 is not inserted into the key cylinder 13, the tumbler 14 projects into the tumbler groove 23 of the sleeve 16. Further, the tumbler 14 of the rotor 19 projects into the tumbler groove 17a. Next, as shown in FIGS. 4 and 5, when the regular key 11 is inserted into the keyway 13a of the cylinder lock 10, each of the plurality of tumblers 14 moves to a retracted position where they do not protrude from the key cylinder 13. . Therefore, the key cylinder 13 together with the key 11 can be pressed inward in the axial direction against the elasticity of the spring 18. When the key cylinder 13 is pressed inward in the axial direction, the protrusion 1 provided on the key cylinder 13
3c is guided along a guide groove 25 formed inside the sleeve 16, and the tip of the key 11 is inserted into the rotor 19. The key cylinder 13 and the rotor 19 are connected by the key 11, and the tumbler 14 in the rotor 19 is removed from the tumbler groove 17a. At this time, the protrusion 13d provided on the key cylinder 13 is inserted into the recess 19 of the rotor 19.
a, the connection between the key cylinder 13 and the rotor 19 becomes even more reliable. Therefore, by rotating the key 11, the lever 21 can be manually rotated to the lock position or the unlock position. After rotating the lever 21, the key 11
When the hand is released, the lever 21, rotor 19 and key cylinder 13 are automatically returned to their initial positions by the elasticity of the return spring 20. When a different type of key is inserted into the key cylinder 13, the tumbler 14 does not move to the unlocked position.
It is held in a locked state in the tumbler groove 23. For this reason, even if a different type of key is rotated, the sleeve 16 will not hold the spring 2.
8, the key cylinder 13 and rotor 19 are not connected. Also, since the tumbler 14 of the rotor 19 is engaged with the tumbler groove 17a, the rotor
To prevent unauthorized rotation of the motor 19.

[0008]

As described above, in the cylinder lock according to the present invention, a cylinder lock having a high resistance to breaking can be obtained, so that crimes such as unauthorized entry or theft can be effectively prevented.

[Brief explanation of the drawing]

[Fig. 1] An exploded perspective view of a cylinder lock according to the present invention.

[Figure 2
] Cross-sectional view along the length direction

[Figure 3] Cross-sectional view taken along line A-A in Figure 2

[Fig. 4] Cross-sectional view showing the state in which the key is inserted in Fig. 2

[Fig. 5] Cross-sectional view taken along line B-B in Fig. 4

[Explanation of symbols]

Claims (4)

[Claims] Claim 1: Comprising a sleeve rotatably disposed within a case, and a key cylinder rotatably disposed within the sleeve and engageable with the sleeve by a tumbler, When the key cylinder is rotated with the key, the key cylinder rotates together with the sleeve and the lever operation is blocked.Insert the regular key into the key cylinder and push it axially inward. A cylinder lock characterized in that it is provided with a rotor that is connected to a key cylinder that is moved and rotated together with a lever at the same time. Claim 2: The key cylinder is pressed outward in the axial direction by a spring, and when a regular key is inserted, the key cylinder is moved inward in the axial direction against the elasticity of the spring. Cylinder lock described in . 3. The cylinder lock according to claim 1, wherein the tumbler of the rotor protrudes from the rotor and engages with the case. 4. The cylinder according to claim 1, wherein when the regular key is inserted into the key cylinder and moved axially inward, the key cylinder is engaged with the lever by the key or directly. Tablet.