JP3090356B2 - Cylinder lock - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lock device, and more particularly to a cylinder lock having a high resistance to breaking.

[0002]

2. Description of the Related Art In a conventional cylinder lock, a regular key can be rotated to a locked position or an unlocked position on a key cylinder provided with a tumbler which engages a groove formed in a case. In the conventional cylinder lock in which the rotation of the key cylinder is prevented by the tumbler that engages with the groove in the case, there is a risk that the tumbler may be unlocked due to breakage. Therefore,
For example, as disclosed in Japanese Patent Application Laid-Open No. 1-315569, a free-turn type cylinder lock in which a key cylinder freely rotates in a case where a rotational force is applied to a key cylinder to unlock the key cylinder has been proposed. The cylinder lock includes a sleeve rotatably disposed in a case, and a key cylinder rotatably supported in the sleeve. When a regular key is inserted into the key cylinder, the tumbler in the key cylinder is released from the groove formed in the sleeve, and the key cylinder can be rotated relative to the sleeve. Thereby, the sliding ring can be engaged with the lock piece operating member to operate the lock device. When a different type of key is inserted into the key cylinder, the key cylinder is held in engagement with the sleeve by the tumbler, so that the key cylinder rotates together with the sleeve. As a result, the lock piece operating member cannot be rotated, so that the lock device cannot be operated.

[0003] In such a free-turn type cylinder lock, when different types of keys are used, the key cylinder rotates freely. For this reason, since a rotational force for breaking the tumbler cannot be applied, a large resistance to breaking can be given.

[0004]

SUMMARY OF THE INVENTION Incidentally, Japanese Patent Application Laid-Open No. Hei.
The lock device disclosed in Japanese Patent Publication No. 315569 has a disadvantage that the key cylinder cannot be operated smoothly after a different kind of key is used. That is, a torsion spring is provided between the front plate and the key cylinder in order to automatically return the rotated key cylinder to the initial position in the lock device. When a different type of key is inserted into the key cylinder and the sleeve and the key cylinder are freely rotated together, the torsion spring generates a reaction force. However, rotation beyond a certain angle limits rotation of the key cylinder due to the torsion spring. For this reason, there is a risk that the torsion spring is broken or broken.
However, if the torsion spring is not provided, when the key cylinder is rotated using a regular key, the key cylinder does not automatically return to the initial position, so that remote locking or unlocking operation is difficult. There are disadvantages. Further, in the lock device disclosed in the above publication, since the torsion spring is provided at the front of the lock device, there is a danger of freezing in cold and cold regions.

Accordingly, an object of the present invention is to provide a cylinder lock in which the key cylinder can completely rotate freely at the time of unauthorized unlocking by solving the above-mentioned disadvantages.

[0006]

A cylinder lock according to the present invention comprises a sleeve rotatably disposed in a case, a key cylinder engageable with the sleeve by a tumbler and rotatably disposed in the sleeve, and a key. A rotor having a cam formed on the cylinder, a projection or recess engaging with the locking portion of the sleeve, and capable of abutting on the cam of the key cylinder; and a rotor disposed adjacent to the rotor and fitted in a groove of the case. The stopper includes a stopper having a mating projection, and a stopper spring disposed between the stopper and the lever and pressing the stopper toward the rotor. This cylinder lock engages the rotor with the sleeve by moving the rotor and stopper in the axial direction by the cam of the key cylinder when the key cylinder is rotated within a certain angle range relative to the sleeve by the regular key. At the same time, the engagement of the stopper with the case is released, and the rotor is connected to the lever.

Further, the lever is operated by rotating the key cylinder together with the rotor, the stopper and the lever by rotating the key cylinder. However, when the key cylinder is rotated by a different key, the key cylinder rotates together with the sleeve, and the operation of the lever is prevented. Further, a return spring is provided between the case and the lever to automatically return the key cylinder together with the stopper spring after the rotation of the key.

[0008]

[Function] When a regular key is inserted into the key cylinder, the engagement between the tumbler and the sleeve in the key cylinder is released,
The key cylinder can be rotated relative to the sleeve. When the key cylinder is manually rotated from this state, the cam of the key cylinder rotates. At this time, since the rotor is engaged with the sleeve that does not rotate, the rotor is moved inward in the axial direction by the cam of the key cylinder. At the same time, the stopper is moved axially inward integrally with the rotor against the elasticity of the stopper spring. Further, the sleeve is held in a non-rotation state with respect to the case.

Thereafter, when the rotor moves sufficiently in the axial direction with the rotation of the key cylinder, the rotor separates from the sleeve and is engaged with the lever. The protrusion of the stopper is separated from the groove of the case, and the rotor is engaged with the lever via the stopper. Furthermore, when the key cylinder is rotated, the key cylinder is engaged with the rotor and the stopper, so that the key cylinder rotates integrally with the rotor, the stopper and the lever against the elasticity of the return spring, and the lever is locked or unlocked. Moved to position.

When the key is released from the key in this state, the lever, the stopper and the rotor are reversely rotated toward the initial position by the elasticity of the return spring, and then the rotor is pressed against the key cylinder by the elasticity of the stopper spring. . As a result, the rotor is pressed against the cam of the key cylinder and applies a rotational force to the key cylinder, so that the key cylinder is automatically returned to the initial position.

When the key cylinder is rotated by a different key, the key cylinder is held in a state of being connected to the sleeve by a tumbler, and is rotated together with the sleeve. For this reason, since the key cylinder does not rotate relative to the sleeve, the rotor does not move in the axial direction relative to the sleeve. For this reason, the key cylinder is not connected to the lever via the rotor, and rotation of the lever is prevented.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

As shown in FIGS. 1 to 3, a cylinder lock 10 according to the present invention includes a case 11, a sleeve 12 rotatably disposed in the case 11, and a key cylinder rotatably disposed in the sleeve 12. 14 is provided. As shown in FIG. 3, the key cylinder 14 is provided with a plurality of tumblers 13 projecting into the groove 12a of the sleeve 12,
The key cylinder 14 is held in engagement with the sleeve 12 by the tumbler 13. A rotor 16, a stopper 17 and a lever 18 are sequentially provided coaxially with the key cylinder 14.

As is apparent from FIG. 2, the key cylinder 1
4, a cam 15 is formed, and a rotor 16 is formed with a projection 20 that can abut on the cam 15 and engages with the locking portion 12 b of the sleeve 12. As shown in FIGS. 5 to 9, the projection 20 is formed with a pair of inclined surfaces 20 a and 20 b. Further, a hole 21 is provided on the side opposite to the protrusion 20. The hole 21 is provided with an arc-shaped notch 23. As shown in FIG. 4, a projection 14 a disposed in the arc-shaped notch 23 of the rotor 16 is formed on the key cylinder 14.

The stopper 17 disposed adjacent to the rotor 16 has an opening 26 having substantially the same shape as the hole 21 of the rotor 16, a projection 17 a fitted to the groove 11 a of the case 11 and the lever 18, and a circle. And an arc-shaped notch 28. The protrusion 17a is slidably disposed in the groove 11a. A stopper spring 19 for pressing the stopper 17 against the rotor 16 is disposed between the stopper 17 and the lever 18. The lever 18 has an arc-shaped projection 30 formed in the axial direction. The projection 30 of the lever 18 is always engaged with the arc-shaped notch 28 of the stopper 17, and when the stopper 17 is moved in the axial direction, the projection 30 of the lever 18 becomes the notch 23 of the rotor 16. And can be engaged. The lever 18 is provided with a hole 31 to which a rod connected to a lock device (not shown) is connected. A return spring 32 is provided between the case 11 and the lever 18. As shown in FIGS. 2 and 3, the sleeve 12 is formed with a groove 12c having a V-shaped cross section. Groove 12c
A ball 34 pressed by a spring 33 is disposed at the center.

In the above configuration, when the key 40 is not inserted into the cylinder lock 10, the sleeve 12, the key cylinder 14, and the lever 18 are in the locked state shown in FIGS. When the regular key 40 is inserted into the key cylinder 14, the tumbler 13 and the sleeve 12
With the key cylinder 14 and the sleeve 12
Can rotate relative to. When the key cylinder 14 is rotated at an angle of about 30 °, the key cylinder 14 is rotated.
With the rotation of, the rotor 16 moves sufficiently in the axial direction. As shown in FIG. 10 and FIG.
Is separated from the locking portion 12b of the sleeve 12. The arc-shaped projection 30 of the lever 18 engaged with the arc-shaped notch 28 of the stopper 17 is engaged with the rotor 16. At this time, the projection 17a of the stopper 17 is
It is detached from one groove 11a. That is, as shown in FIG.
The key cylinder 14 and the rotor 16 are engaged with each other by contacting the end of the arc-shaped notch 23.

When the key cylinder 14 is further rotated while the key cylinder 14 is engaged with the rotor 16 and the stopper 17, the key cylinder 14 resists the elasticity of the return spring 32, the rotor 16, the stopper 17 and the lever 18.
13 to 15, the lever 18 is moved to the locked position or the unlocked position as shown in FIGS.

When the hand is released from the key 40 in this state, the lever 18, the stopper 17 and the rotor 16 are reversely rotated toward the initial position by the elastic force of the return spring 32, and then the rotor 16 is moved by the elastic force of the stopper spring 19. Pressed against cylinder 14. As a result, the rotor 16 is pressed against the cam 15 of the key cylinder 14 and applies a rotational force to the key cylinder 14.
The key cylinder 14 is automatically returned to the initial position. The rotor 16 and the stopper 17 are also returned to the initial positions shown in FIGS.

When the key cylinder 14 is rotated by a different key, the key cylinder 14 is held in a state of being connected to the sleeve 12 by the tumbler 13 and is rotated together with the sleeve 12. For this reason, the key cylinder 14 is
2, the rotor 16 does not move in the axial direction relative to the sleeve 12. Therefore, as shown in FIGS. 16 and 17, the ball 33 is pushed outward from the V-shaped groove 12 a formed in the sleeve 12 against the elasticity of the spring 34. For this reason, the key cylinder 14, the rotor 16, and the sleeve 12 freely rotate integrally. In this case, since the relative rotation between the key cylinder 14 and the rotor 16 cannot be obtained, the key cylinder 14 is not connected to the lever 18 via the rotor 16. The protrusion 17 a of the stopper 17 is provided in the groove 1 of the case 11.
Since the lever 18 is held in the locked state, the rotation of the lever 18 is prevented.

Thus, the cylinder lock 1 according to the present invention
At 0, the key cylinder 14 rotates together with the sleeve 12 at the time of unauthorized unlocking, and the rotation of the lever 18 is prevented. Therefore, a large external force is not applied to the tumbler 13 at the time of unauthorized unlocking, and a large resistance to breaking is obtained.

The embodiments of the present invention are not limited to the above-described embodiments, and various changes can be made. For example, in the above-described embodiment, an example in which a disk tumbler is used as the tumbler 13 has been described. However, a pin tumbler can be used. Further, instead of forming the cam 15 on the key cylinder 14, the cam 15 may be formed on a rotating member that rotates integrally with the key cylinder 14. In the above-described embodiment, an example is shown in which the rotor is provided with a protrusion that engages with the locking portion of the sleeve. However, a recess may be provided instead of the protrusion.

[0022]

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

[Brief description of the drawings]

FIG. 1 is a sectional view of a cylinder lock according to the present invention.

FIG. 2 is a cross-sectional view at a position 90 ° away from the cross-section of FIG. 1;

FIG. 3 is an exploded perspective view.

FIG. 4 is a sectional view taken along the line AA in FIG. 2;

FIG. 5 is a plan view of a rotor.

FIG. 6 is a sectional view taken along the line AA of FIG. 5;

FIG. 7 is a sectional view taken along the line BB of FIG. 5;

FIG. 8 is a bottom view of the rotor.

FIG. 9 is a side view of a rotor.

10 is a sectional view showing a state in which the key cylinder is rotated by an angle of about 30 ° by a regular key and is rotated in the section of FIG. 1;

FIG. 11 is a cross-sectional view showing a state rotated by an angle of about 30 ° in FIG. 2;

FIG. 12 is a cross-sectional view showing a state rotated by an angle of about 30 ° in FIG. 4;

13 is a cross-sectional view showing a state in which the key cylinder is rotated by an angle of about 90 ° by a regular key and is rotated in the cross section of FIG. 1;

FIG. 14 is a cross-sectional view showing a state rotated by about 90 ° in FIG. 2;

FIG. 15 is a cross-sectional view showing a state rotated by about 90 ° in FIG. 4;

FIG. 16 shows that a key cylinder is rotated by a different type of key,
Sectional view showing the rotated state in FIG.

FIG. 17 is a cross-sectional view showing a state where it is rotated by a different key;

[Explanation of symbols]

10. . 10. cylinder lock; . Case, 11a. . Groove, 12. . Sleeve, 13. . Tumbler, 14. . Key cylinder, 15. . Cam, 16; . Rotor, 17. .
Stopper, 17a. . Projection, 18 ·· lever, 1
9. . Stopper spring, 20. . Projection, 40. .
Key, 32. . Return spring,

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) E05B 29/02 E05B 17/20

Claims (2)

(57) [Claims] 1. A key cylinder, comprising: a sleeve rotatably arranged in a case; and a key cylinder engageable with the sleeve by a tumbler and rotatably arranged in the sleeve. A cylinder lock in which the key cylinder rotates together with the sleeve to prevent the operation of the lever, wherein the key cylinder has a cam formed on the key cylinder; A stopper that is disposed adjacent to the rotor and has a protrusion that fits into the groove of the case; a stopper spring that is disposed between the stopper and the lever and that presses the stopper toward the rotor. When the key cylinder is rotated within a certain angle range relative to the sleeve with a regular key, the cam of the key cylinder By displacing the rotor and the stopper in the axial direction to release the engagement of the rotor with the sleeve, releasing the engagement of the stopper with the case, connecting the rotor to the lever, and rotating the key cylinder, A cylinder lock wherein a lever is operated by rotating a cylinder integrally with a rotor, a stopper and a lever. 2. The cylinder lock according to claim 1, wherein a return spring is provided between the case and the lever.