JPH0524835U - Cylinder lock device - Google Patents

Abstract

(57) [Abstract] [Purpose] To increase the strength against breakage of the cylinder lock device. [Structure] A first guard plate 15 and a second guard plate 16 made of hard metal are stacked between a key cylinder 14 rotatably arranged in a case 11 and a front wall 11a of the case 11. Will be placed. The first guard plate 15 is non-rotatably attached to the front wall 11a of the case 11, and the second guard plate 16 is rotatably attached to the key cylinder 14 inside the first guard plate 15. Therefore, the second guard plate 16 is
The second guard plate 16 is protected by the guard plate 15, and it becomes difficult to remove the second guard plate 16 illegally.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a locking device, and more particularly to a cylinder locking device having a great resistance to breakage.

[0002]

[Prior Art]

 Conventional cylinder locks allow a regular key to be rotated into a locked or unlocked position on a key cylinder with a tumbler that engages a groove formed in the 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 is broken and the lock is unlocked. Therefore, as disclosed in Japanese Patent Laid-Open No. 1-250577, a structure has been proposed in which a guard plate is arranged between the cover and the key cylinder. In this structure, only one guard plate is arranged, so that there is a risk that the guard plate is illegally removed by using a tool. Also, as disclosed in U.S. Pat. No. 4,490,988, a lock assembly provided with a plurality of guard plates has been proposed. These multiple guard plates have almost the same diameter and all rotate integrally with the key cylinder, so removing the guard plate located at the front makes it easy to install the guard plate located at the rear. It can be removed and its resistance to destruction is not very great.

[0003]

[Problems to be solved by the device]

 Therefore, an object of the present invention is to provide a cylinder lock device having high strength against breakage.

[0004]

[Means for Solving the Problems]

 In the cylinder lock device according to the present invention, the first guard plate and the second guard plate made of hard metal are superposed between the key cylinder rotatably arranged in the case and the front wall of the case. Are arranged. Prevents rotation of the first guard plate by forming the first guard plate that comes into contact with the front wall of the case with a non-circular cross section and fitting the first guard plate into the recess formed in the front wall of the case To do. Also, the second guard plate that comes into contact with the key cylinder is fitted into the concave portion or the convex portion of the key cylinder so that the second guard plate is rotatably arranged together with the key cylinder. In the embodiment of the present invention, the first guard plate is formed with a step portion into which the second guard plate is fitted. A convex portion is formed on the key cylinder, and a concave portion into which the convex portion of the key cylinder is fitted is formed on the second guard plate.

[0005]

[Action]

 The first guard plate is non-rotatably attached to the front wall of the case, and the second guard plate is rotatably attached to the key cylinder inside the first guard plate. Therefore, the second guard plate is protected by the first guard plate, making it difficult to remove the second guard plate illegally.

[0006]

【Example】

 An embodiment of the cylinder lock device according to the present invention applied to a steering lock device will be described below with reference to FIGS.

The steering lock device 10 according to the present embodiment includes a substantially cylindrical housing 12 arranged in a case 11, and a sleeve 13 rotatably arranged in a through hole 12 a of the housing 12. Have. A key cylinder 14 is rotatably arranged in a housing hole 13a formed in the sleeve 13. In the steering lock device 10, a first guard plate 15 and a second guard plate 16 which are made of hard metal are arranged between the front wall 11a of the case 11 and the key cylinder 14 in an overlapping manner. As shown in FIG. 2, the first guard plate 15 has a step portion 15a to which the second guard plate 16 is fitted and a notch portion 15b formed on the outer periphery, and is formed in a non-circular cross section. It The first guard plate 15 abuts on the front wall 11a of the case 11, and the cutout portion 15b is fitted to the protrusion 11b formed on the front wall 11a. Due to the protrusion 11b, a recess 11c is formed relatively in the front wall 11a of the case 11. By fitting the first guard plate 15 into the recess 11c, the rotation of the first guard plate 15 is blocked.

The second guard plate 16 is in contact with the key cylinder 14 and is formed with an arcuate concave portion 16a into which the convex portion 14a of the key cylinder 14 is fitted. The second guard plate 16 is rotatably arranged together with the key cylinder 14 by fitting the convex portion 14a into the concave portion 16a.

As described above, the first guard plate 15 is non-rotatably attached to the front wall 11 a of the case 11, and the second guard plate 16 is rotatably attached to the key cylinder 14 inside the first guard plate 15. It is installed. Therefore, the second guard plate 16 is protected by the first guard plate 15 guarded by the front wall 11a of the case 11, which makes it difficult to remove the second guard plate 16 illegally. Can be changed. A convex portion is formed on the second guard plate 16 and the convex portion is fitted into a concave portion formed on the key cylinder 14, or the second guard plate 16 itself is formed to have a non-circular cross section so that the key cylinder 14 is formed. You may fit in the formed recessed part. Further, three or more guard plates such as a third guard plate may be provided.

[0010]

[Effect of the device]

 As described above, in the present invention, the second guard plate is more surely protected by the first guard plate, and a cylinder lock device having a large resistance to destruction is obtained, so that a crime such as illegal intrusion or theft can be prevented. It becomes possible to effectively prevent it.

[Brief description of drawings]

FIG. 1 is a partial sectional view of a steering lock device showing an embodiment of the present invention.

FIG. 2 is an exploded perspective view

[Explanation of symbols]

10. ． Steering lock device, 11. ． Case, 1
1a. ． Front wall, 14. ． Key cylinder, 14a. ． Convex part,
15. ． First guard plate, 15a. ． Step, 1
6. ． Second guard plate, 16a. ． Recess,

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[Procedure amendment]

[Submission date] June 11, 1991

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Figure 1]

[Fig. 2] ─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] September 21, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Item name to be amended] Scope of utility model registration request

[Correction method] Change

[Correction] Scope of utility model registration request]

Claims (4)

[Scope of utility model registration request] 1. A first guard plate and a second guard plate, which are made of hard metal, are arranged so as to overlap each other between a key cylinder rotatably arranged in a case and a front wall of a case. , The second guard plate can be rotated together with the key cylinder by abutting the first guard plate on the front wall of the case and fitting the second guard plate abutting on the key cylinder into the concave or convex portion of the key cylinder Cylinder lock device characterized by being placed in. 2. The cylinder lock device according to claim 1, wherein the first guard plate has a step portion into which the second guard plate is fitted. 3. The cylinder lock device according to claim 1, wherein the key cylinder is formed with a convex portion, and the second guard plate is formed with a concave portion into which the convex portion of the key cylinder is fitted. 4. A first guard plate formed by forming a first guard plate that comes into contact with the front wall of the case with a non-circular cross section and fitting the first guard plate into a recess formed in the front wall of the case. "Claim 1" that prevented the rotation of
The cylinder lock device described in 1.