JP3314052B2 - Locking device with protective cap - 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 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 internal tumbler locking mechanism 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 according to the first aspect of the present invention will be described with reference to the reference symbols in the accompanying drawings. the internal thread portion 7 is provided on the peripheral surface, the head outside of the rotor 2
The external thread 6 is provided on the peripheral surface, and all the threads of the internal thread 7 are
The fixed case 1 and the rotor 2 are passed through the male screw portion 6.
The annular gap 3 fitted protection cap 4 between, protective cab
By positioning the female thread 7 of the cap 4 in the annular recess 8 on the back side of the male thread 6 of the rotor 2 , the protective cap 4 is
A magnet 10 for holding the protective cap 4 is fixedly attached to the tip of the rotation operating member 9 of the protective cap 4 so as to hold the stationary case 1 so as to rotate freely . In the lock device according to the second aspect of the invention, one or both of the male screw portion 6 of the head 5 of the rotor 2 and the female screw portion 7 of the protective cap 4 are formed with one or less ridges.

In the lock device of the present invention thus configured, when the protective cap 4 is fitted to the annular gap 3 between the inner peripheral flange 5 of the fixed case 1 and the head of the rotor 2 to a predetermined depth, The female thread 7 on the protective cap 4 and the male thread 6 on the rotor 2 are no longer meshed with each other.
Only idles. Then, since the female thread 7 of the protective cap 4 comes into contact with the male thread 6 of the rotor 2, the removal of the protective cap 4 is stopped.

When the drill bit hits the protective cap 4 in an attempt to violently destroy the internal tumbler lock mechanism 12, the protective cap 4 merely rotates together with the drill bit and does not move forward. Also,
Even if a thief tries to turn the protective cap 4 by hand, the protective cap 4 cannot be properly grasped.
To the front, and the female screw 7 on the protective cap 4 side
Cannot be engaged with the start end of the male screw portion 6 on the rotor 2 side.

When the legitimate administrator attempts to insert the key into the keyhole 11 of the rotor 2, if the protective cap 4 is attracted by the magnet 10 of the rotary operating member 9, the protective cap 4 can be reliably pulled toward the user. it can. Therefore, the starting end of the internal thread 7 on the protective cap 4 side can be easily engaged with the starting end of the external thread 6 on the rotor 2 side, and the operation of removing the protective cap 4 can be easily performed.

[0010]

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 rotation operation member 9 is made of a round bar material, and a magnet 10 is embedded and fixed at the tip. A drive rod 13 is fixed to the center of the rotary operation member 9 so as to penetrate the magnet 10, and an elliptical drive projection 14 is provided on a distal end surface of the drive rod 13. An elliptical passive recess 15 is provided in the front wall of the protective cap 4, and the driving projection 14 is connected to the passive recess 15.
The rotational force from the rotary operation member 9 is transmitted to the protective cap 4. The front wall portion of the protective cap 4 is formed in a truncated conical shape so that there is no grip. The front wall portion may be formed flush with the front wall portion of the fixed case 1 or may be recessed further.

[0011]

As described above, in the lock device of the present invention, the tip 4a of the protective cap 4 covering the head 5 of the rotor 2 is provided.
A female screw portion 7 is provided on the inner peripheral surface of
An external thread 6 is provided, and all the threads of the internal thread 7 are male threads.
The protective cap 4 is fitted into the annular gap 3 between the fixed case 1 and the rotor 2 so that the protective cap 4 passes through the protective cap 4.
The female screw 7 of the rotor 2 is positioned in the annular recess 8 on the back side of the male screw 6 of the rotor 2 so that the protective cap 4 is fixed.
The protective cap 4 is fixed even if the drill bit hits the protective cap 4 in an attempt to violently destroy the internal tumbler lock mechanism 12 because the base 1 is held so as to be able to idle.
The drill bit only idles with respect to case 1 and rotates with the drill bit, but does not advance.

In addition, even if a thief tries to turn the protective cap 4 by hand, the protective cap 4 cannot be properly grasped.
Pull the protective cap 4 forward, and place it in the annular recess 8.
It is extremely difficult to engage the starting end of the female screw portion 7 of the protective cap 4 with the starting end of the male female screw portion 6 of the rotor head 5,
There is no removal of the protective cap 4 by a thief. On the other hand, when the legitimate administrator tries to insert the key into the keyhole 11 of the rotor 2, the protection cap 4 can be attracted by the magnet 10 of the rotary operation member 9, and the protection cap 4 can be pulled forward. Since the starting end of the internal thread 7 of the protective cap 4 can easily be engaged with the starting end of the external thread 6 of the rotor 2, the protective cap 4 can be easily removed.

As described above, since the protective cap 4 can be easily removed as needed, there is no need to provide a key insertion through-hole in the protective cap 4, and a picking tool cannot be applied to this lock device. Therefore, according to the present invention,
A locking device that is strong against both violent destruction by drilling and unauthorized unlocking by a picking tool is obtained.

In the lock device according to the second aspect of the present invention, one or both of the male screw portion 6 of the head 5 of the rotor 2 and the female screw portion 7 of the protective cap 4 are formed with one or less peaks. The male thread 6
The engagement operation between the start ends of the female screw portion 7 and the female screw portion 7 is more difficult, and the security is further improved.

[Brief description of the drawings]

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

FIG. 2 is a longitudinal sectional view of a main part of the lock device in a state where a rotary operation member is inserted.

FIG. 3 is a longitudinal sectional view of a main part of the lock device in a state where a protective cap is removed by the rotation operation member.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fixed case 2 Rotor 3 Annular clearance 4 Protective cap 5 Rotor head 6 Female thread part 7 Male thread part 8 Annular concave part 9 Rotation operation member 10 Magnet

Claims (2)

(57) [Claims] An internal thread portion is provided on an inner peripheral surface of a tip portion of a protective cap for covering a head portion of a rotor.
A male screw 6 is provided on the outer peripheral surface of the head of
Fixing case 1 so that the whole mountain passes through male thread 6.
The protective cap 4 is fitted into the annular gap 3 between the rotor and the rotor 2, and the female screw portion 7 of the protective cap 4 is positioned in the annular recess 8 on the back side of the male screw portion 6 of the rotor 2 to provide protection.
The cap 4 is held to the fixed case 1 so as to be idle.
Allowed, protective cap 4 of the rotary operation to the distal end of the member 9 comprising a protective cap 4 is fixed a magnet 10 for attracting the protective cap with the lock device. 2. The locking device with a protective cap according to claim 1, wherein one or both of the male screw portion 6 of the head 5 of the rotor 2 and the female screw portion 7 of the protective cap 4 is formed with one or less peaks.