JP2001012119A - Lock device having protective cap - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lock device having a protective cap which is strong against the violent breakage by the drilling, and the illegal unlocking by a picking tool. SOLUTION: A protective cap 4 is fitted in an annular clearance 3 between a fixed case 1 and a rotor 2, and engaged with an annular recessed part 6 provided on a reverse side of an inner circumferential flange part 5 of the fixed case 1 and an annular receiving groove 7 provided on an outer circumference of a side wall part of the protective cap 4 across a C-ring shaped locking member 8, a notched part 9 communicating with the annular recessed part 6 is provided in the inner circumferential flange part 5 of the fixed case 1, and the locking member 8 is elastically deformed in the centripetal direction by an operation member inserted from the notched part 9, and evacuated from the annular recessed part 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lock device with a protective cap for preventing violent destruction of a tumbler lock mechanism by drilling and illegal unlocking by inserting a picking tool into a keyhole.

[0002]

2. Description of the Related Art In a drill breaking protection type locking device disclosed in Japanese Patent Application Laid-Open No. 10-8797, the entire front surface of a fixed case and a rotor is covered by a front wall portion of a hard disk having high hardness. The side wall portion of the guard disk exposed to the outside is formed in a truncated cone shape whose diameter decreases toward the front wall portion, and the inner surface receiving groove at the thick base end of the guard disk and the fixing cable are formed.
With a retaining ring engaged with the outer surface receiving groove of the front end cylindrical part of the
The guard disk is rotatably connected to the fixed case, and
A through hole communicating with the keyhole of the guard disk is provided in the front wall of the guard disk.

In this locking device, when a thief tries to break the tumbler locking mechanism inside with a drill tool and hits the drill bit against the front wall of the guard disk, the guard disk rotates together with the drill bit. To do
The drill bit is prevented from advancing through the guard disk and the drill bit is prevented from approaching the tumbler lock mechanism. When the authorized administrator unlocks the lock device,
The guard disk is rotated appropriately to align the through hole of the guard disk with the key hole of the rotor, and then the key is inserted into the key hole through the through hole.

[0004] However, in the conventional drill destruction protection type locking device constructed as described above, it is impossible to remove the guard disk once it is mounted. Therefore, it is necessary to provide a key insertion through hole in the guard disk. Therefore, there is a problem that protection against unauthorized unlocking by inserting a picking tool is not perfect.

[0005]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a locking device with a protective cap which is strong against both violent destruction by drilling and unauthorized unlocking by a picking tool.

[0006]

The lock device with a protective cap according to the first aspect of the present invention is provided with an annular gap 3 between the fixed case 1 and the rotor 2. A protective cap 4 for covering the head of the rotor 2 is fitted into the annular gap 3, an annular recess 6 is provided on the back side of the inner peripheral flange 5 of the fixed case 1, and an annular receiving groove 7 is formed on the outer periphery of the side wall of the protective cap. Is provided, and the C-ring-shaped locking member 8 is straddled and engaged with the annular concave portion 6 and the annular receiving groove 7 to thereby prevent the protective cap 4 from being pulled out and to fix the fixed case 1.
A notch 9 communicating with the annular recess 6 is provided in the inner peripheral flange 5 of
An operating member 10 for elastically deforming the locking member 8 in the centripetal direction to escape from the annular concave portion 6 is inserted through the cutout portion 9. According to the invention of claim 2, the core member 13 slidable with respect to the operation member 10 is connected to the operation member 1.
The magnet 22 for adsorbing the protective cap 4 is fixed to the tip of the core member 13.

In the lock device of the present invention thus configured, the locking member 8 is engaged with both the annular concave portion 6 and the annular receiving groove 7 so that the protective cap 4 cannot be removed. Therefore, the head of the rotor 2 is always covered with the protective cap 4, and the picking tool cannot be inserted into the keyhole 11 of the rotor 2 and unlocked illegally. When the drill bit strikes the protective cap 4 in an attempt to violently destroy the internal tumbler lock mechanism 24 by drilling, the protective cap 4 merely engages with the drill bit and rotates. Moving forward is impossible. When the authorized administrator intends to perform the unlocking operation, the operation member 10 may be inserted through the notch 9 and the locking member 8 may be elastically deformed in the centripetal direction. Yes, the workability of the entire unlocking operation is not degraded.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the illustrated embodiment, the protective cap 4 is made of a rigid steel material or a magnetic ceramic material having sufficiently high hardness. The operating member 10 is formed in a cylindrical shape corresponding to the annular gap 3, and has
Four arc-shaped projections 12 are formed at intervals of degrees. Four arc-shaped notches 9 are provided in the inner peripheral flange portion 5 of the fixed case 1 at intervals of 45 degrees. The arc-shaped projection 12 is inserted into the arc-shaped notch 9, and is a part that performs the essential function of the operation member 10. The arc-shaped projection 12 is pressed so as to easily press the circular circumferential surface of the locking member 8 to elastically deform in the centripetal direction.
Is formed with a tapered surface portion 12a on the inner surface side.

A cylindrical core member 13 is fitted inside the cylindrical operation member 10, and is inserted into an axially long slot 14 in the side wall of the operation member 10 and a round hole 15 in the side wall of the core member 13. Is a slot 17 extending in the axial direction of the side wall of the core member 13 while the first guide pin 16 is inserted therethrough.
A second guide pin 19 is inserted into the round hole 18 in the side wall of the operating member 10 and the operating member 10 and the core member 13 are slidable with each other along the axial direction. Core member 1
A compression coil spring 21 is housed between the hollow bottom wall 20 and the second guide pin 19 to urge the core member 13 to return. A magnet 22 is fixed to the opening at the distal end of the core member 13. The first guide pin 16 and the second
At both ends of the guide pin 19, retaining rings 23 are mounted.

In this embodiment, when the operating member 10 is slid with respect to the core member 13 and the arc-shaped projection 12 is inserted to a predetermined depth from the arc-shaped notch 9, the entire cross-section of the locking member 8 has a protective cap. 4 is pushed into the annular receiving groove 7 at this stage.
Abuts the front wall of. Therefore, when the arc-shaped projection 12 of the operation member 10 is pulled out from the arc-shaped notch 9 in a state where both the operation member 10 and the core member 13 are grasped and the positional relationship between them is maintained, the protective cap 4 is moved to the magnet 22. Is automatically extracted from the annular gap 3 while being adsorbed to the protective cap, thereby improving the workability of removing the protective cap.

Thereafter, when one of the operating member 10 and the core member 13 is released, the core member 13 advances to the distal end side of the operating member 10, and the whole or main part of the protective cap 4 is moved to the operating member 10. Protruding from the tip opening of the. The protective cap 4 may be stored while being separated from the magnet 22 or may be stored while adsorbed on the magnet 22. However, considering the convenience of reattachment, it is better to keep the protective cap 4 adsorbed on the magnet 22. Easy to handle.
In re-attaching the protective cap 4, the locking member 8 is pushed against the edge surface of the inner peripheral flange 5 of the fixed case 1,
That is, it is elastically deformed in the diameter reducing direction and passes through the inner peripheral flange 5. When it comes to the annular recess 6, the locking member 8 is elastically deformed in the centrifugal direction, that is, in the direction of the enlarged diameter, and engages over both the annular recess 6 and the annular receiving groove 7.

[0012]

As described above, according to the first aspect of the present invention, the protective cap 4 covering the head of the rotor 2 is fitted into the annular gap 3 between the fixed case 1 and the rotor 2, and the inner peripheral flange of the fixed case 1 is provided. The C-ring shaped locking member 8 is straddled with the annular concave portion 6 of FIG. 5 and the annular receiving groove 7 on the outer periphery of the side wall portion of the protective cap to thereby prevent the protective cap 4 from being pulled out. When the drill bit abuts against the protective cap 4 due to violent destruction of the internal tumbler lock mechanism 24, the protective cap 4 merely rotates together with the drill bit and does not move forward. On the other hand, when the authorized administrator tries to insert the key into the keyhole 11 of the rotor 2, the operating member 10 is inserted into the annular recess 6 from the cutout 9 of the inner peripheral flange 5 of the fixed case 1, and the locking member 8 is inserted. The protective cap 4 can be easily removed by elastically deforming in the centripetal direction to escape from the annular recess 6, so that there is no need to provide a through hole for key insertion in the protective cap 4, and this lock device can be used. Can not apply picking tools. Therefore, according to the first aspect of the present invention, it is possible to obtain a locking device that is strong against both violent destruction by drilling and unauthorized unlocking by a picking tool.

According to the second aspect of the present invention, the core member 13 slidable with respect to the operation member 10 is fitted to the operation member 10, and the magnet 22 to which the protective cap 4 is attracted is fixed to the tip of the core member 13. Therefore, the operation of removing the protective cap 4 can be easily performed.

[Brief description of the drawings]

FIG. 1 is a front view of a lock device with a protective cap according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view taken along line AA of FIG.

FIG. 3 is a longitudinal sectional view of the lock device in a state where an operation member is inserted.

FIG. 4 is a plan view of the operation member.

FIG. 5 is a rear view of the operation member.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fixed case 2 Rotor 3 Annular gap 4 Protective cap 5 Inner peripheral flange 6 Annular recess 7 Annular receiving groove 8 Locking member 9 Notch 10 Operating member

Claims (2)

[Claims] An annular gap (3) is provided between the fixed case (1) and the rotor (2), and a protective cap (4) covering the head of the rotor (2) is fitted into the annular gap (3).
An annular recess 6 is provided on the back side of the protective cap, and an annular receiving groove 7 is provided on the outer periphery of the side wall of the protective cap. As a result, the removal of the protective cap 4 is stopped, the notch 9 communicating with the annular concave portion 6 is provided in the inner peripheral flange portion 5 of the fixed case 1, and the locking member 8 is elastically deformed in the centripetal direction to remove the protective member 4 from the annular concave portion 6. A lock device with a protective cap in which an operating member 10 to be removed is inserted from the cutout portion 9. 2. A core member 13 slidable with respect to the operation member 10 is fitted to the operation member 10, and a magnet 22 for adsorbing the protective cap 4 is fixed to a tip of the core member 13. Item 2. A lock device with a protective cap according to Item 1.