JPH0978904A - Wrongful unlocking preventing device for lock - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a look body from being cut to destruction by a drill, etc., make impossible the insertion of a foreign matter into a key hole, and also enable its manufacture at a low cost. SOLUTION: This device is formed of a leg plate 2 inserted to the key hole 1 of a lock 5 and held in an insert position by an internal tumbler structure, and a cap body 4 provided continuously to the rear end part of the leg plate 2 so as to cover the front surface of the lock 5. The leg plate 2 can be held in the insert position also by the attracting force of a magnet provided on the front side of the cap body 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an unauthorized unlocking prevention device for a lock, which prevents unauthorized unlocking due to external damage such as a drill.

[0002]

2. Description of the Related Art In a conventional cylinder lock or the like, a tumbler pin is moved from a predetermined position by hitting a blade of a drill near the boundary between a lock body and a rotor and breaking the upper end or the lower end of the tumbler body or the tumbler. There is a risk that it may be unlocked illegally by dropping it and losing its function as a lock.

In order to prevent the lock from being broken by these drills, it has been proposed to form the entire lock with a metal having a high hardness, but this method requires a high cost for producing the lock. Since the keyhole is exposed above, there is a risk of being unlocked illegally by inserting a wire-like object into the keyhole and operating a pin tumbler or the like.

[0004]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to prevent the breakage of the lock body by a drill or the like, prevent the insertion of foreign matter into the keyhole, and prevent the lock from being manufactured at low cost. It is to provide a correct lock prevention device.

[0005]

Means for Solving the Problems Hereinafter, referring to the accompanying drawings, reference numerals in the accompanying drawings will be referred to. In the lock unauthorized access preventing device shown in claim 1, the leg plate 2 is inserted into the keyhole 1 of the lock 5,
The tumbler structure inside the lock holds it in the insertion position. A lock 5 is attached to the rear end of the leg plate 2.
The cap body 3 is continuously provided so as to cover the front surface of the.

In the illegal unlocking prevention device according to claim 2, the lock 5
The leg plate 2 is inserted into the keyhole 1 of the lock plate 1, and the cap body 3 is connected to the rear end of the leg plate 2 so as to cover the front surface of the lock 5. Further, a magnet 4 is provided on the front side of the cap body 3, and the leg plate 2 is held at the insertion position by being attracted to the front surface of the lock 5.

In the unauthorized unlocking prevention device according to claim 3, the lock 5
The leg plate 2 is inserted into the keyhole 1 of the lock plate 1, and the cap body 3 is connected to the rear end of the leg plate 2 so as to cover the front surface of the lock 5. Further, a magnet 8 is provided on the front side of the cap body 3, and the leg plate 2 is held at the insertion position by being attracted to the front side of the lock 5. Further, the magnet key is provided with a magnet 7 which is abutted on the back side of the cap body 3 and attracts the magnet 8 on the cap body 3 side to extract the leg plate 2 from the key hole 1.

In the unauthorized unlocking prevention device according to claim 4, the lock 5
A recess 9 is provided on the front side of itself or a member to which the lock 5 is attached, a groove 10 is provided on the inner peripheral surface of the recess 9, and a lock is provided at the rear end of the leg plate 2 inserted into the keyhole 1 of the lock 5. 5 is provided with a cap body 3 for covering the front face portion, and a C-shaped stop ring 12 engaging with the groove 10 and having a through hole 13 at the end is housed in the cap body 3, and the operation tool is pushed into the through hole 13. The operation hole 14 for inserting is provided on the back side.

In the illegal unlocking prevention device according to claim 5, the lock 5
A recess 9 is provided on the front side of itself or a member to which the lock 5 is attached, a groove 10 is provided on the inner peripheral surface of the recess 9, and a lock is provided at the rear end of the leg plate 2 inserted into the keyhole 1 of the lock 5. A cap body 3 is provided for covering the front surface of the cap body 5, and a stop plate 11 that fits in the groove 10 and engages with the back surface of the cap body 3 is provided.

In the illegal unlocking prevention device according to claim 1, the leg plate 2 is provided.
The pin tumbler 16 is engaged with the locking recess 15 provided in the leg plate 2, and the leg plate 2 is held at the insertion position. Also leg plate 2
The cap body 3 connected to the rear end portion completely covers the front surface of the lock 5. When removing this device,
The magnetic key 17 having a single polarity or a non-single polarity abuts and attracts the cap body 3 to pull out the leg plate 2 from the insertion position.

In the illegal unlocking prevention device according to claims 2 and 3, magnets 4 and 8 provided on the front side of the cap body 3 connected to the rear end of the leg plate 2 are attracted to the front side of the lock 5. As a result, the leg plate 2 is held at the insertion position of the keyhole 1. When removing this device, the magnet keys 17 and 6 having the magnets 18 and 7 provided so that the magnet 4 provided on the cap body 3 attracts from the back side of the cap body 3 can be removed from the back side of the cap body 3. Butt and adsorb, and pull out the leg plate 2 from the insertion position.

In the illegal unlocking prevention device of the fourth aspect, the leg plate 2 is held at the insertion position of the key hole 1 by the C-shaped retaining ring 12 accommodated in the cap body 3 engaging with the groove 10. . When removing this device, the operation tool is inserted into the operation hole 14 and the through hole 13 provided at the end of the C-shaped ring 12 is inserted.
When a suitable operation tool is engaged with the through holes 13 so that the through holes 13 are attracted to each other, the locking portion 19 is disengaged from the groove 10 and is housed in the cap body 3. By pulling out the device in this state, the leg plate 2 can be pulled out from the insertion position.

In the illegal unlocking prevention device according to claim 5, the stop plate 1 is provided.
The leg plate 2 is held at the insertion position of the key hole 1 by fitting 1 into the groove 10 and engaging with the back surface of the cap body 3. When removing this device, the stop plate 11 is detached from the groove 10 by engaging the operation tool with the through hole 20 provided at the end portion of the stop plate 11 so as to draw the respective through holes 20 toward each other. After that, the magnet key 17 is abutted against the back side of the cap body 3 to adsorb and pull out the leg plate 2 to the keyhole 1
Pull out from.

[0014]

1 to 3, the lock 5 is fixed to a door 21 and a flange 22 on the front surface of the lock 5 is tapered. The edge of the cap body 3 covering the front side of the lock 5 is tapered so as to be flush with the surface of the collar 22. The back side of the cap body 3 is made of high hardness metal or ceramic.

In the embodiment shown in FIGS. 4, 5 and 10, the lock 5 is a handle lock device 2 fixed to the door 21.
It is attached to 3. In the embodiment shown in FIGS. 3, 6 and 8, the annular magnet 4 is provided on the front side of the cap body 3, and the polarity of the magnet attracted to the front side of the lock 5 is the N pole. The polarity of the magnet 18 provided on the magnet key 17 used for removing this device is such that the side attracted to the back side of the cap body 3 is the N pole.

In the embodiment shown in FIG. 9, the cap body 3
6 cylindrical magnets 8 are embedded on the front side of
The polarities of the respective magnets are as shown in FIG. The magnet key 6 for removing the device is embedded with magnets 7 in the same arrangement as the magnets 8 provided on the cap body 3, and when the magnet key 6 is abutted on the back side of the cap body 3. The polarities of the magnets 8 provided on the cap body 3 and the magnets 7 provided on the magnet key 6 are aligned so as to attract each other.

[0017]

As described above, in the unauthorized unlocking prevention device of the present invention, by covering the front side of the lock 5 with the cap body 3, it is possible to prevent the act of breaking the lock by a drill and to wire the key hole 1 with a wire. It is impossible to operate the pin tumbler etc. by inserting the picking tool in the shape of a square, and the unauthorized unlocking is prevented.

The edge of the cap body 3 may be tapered as shown in FIGS. 1 to 3, or the front surface of the handle lock device 23 and the back surface of the cap body 3 may be aligned as shown in FIG. Alternatively, by setting the handle lock device so that it comes to a position where the handle lock device is inserted more than the front face portion, it is difficult to grip the cap body 3 with pliers or the like, and the prevention device is prevented from being illegally pulled out from the key hole 1. Furthermore, by making the front side of the cap body 3 and the magnets 7 and 8 arranged on the magnet key 6 have arbitrary polarities and arbitrary arrangements, it is possible to make counterfeiting of the magnet key 6 difficult and prevent the prevention device. Precisely protected from unauthorized withdrawal.

[Brief description of drawings]

FIG. 1 is a perspective view of an illegal unlocking prevention device according to an embodiment of the invention of claim 1. FIG.

FIG. 2 is a longitudinal sectional view of a lock equipped with the illegal unlocking prevention device of FIG.

FIG. 3 is a perspective view of an illegal unlocking prevention device according to an embodiment of the invention of claim 2;

FIG. 4 is a longitudinal sectional view of a lock equipped with the illegal unlocking prevention device of FIG.

FIG. 5 is an exploded perspective view of an unauthorized unlocking prevention device according to an embodiment of the invention of claim 5;

FIG. 6 is a vertical cross-sectional view in another embodiment of the invention of claim 2;

7 is a longitudinal sectional view of a lock equipped with the illegal unlocking prevention device of FIG.

8 is a perspective view of an unauthorized unlocking prevention device and a magnetic key of FIG. 6. FIG.

FIG. 9 is a perspective view of an unauthorized unlocking device and a magnet key according to an embodiment of the invention of claim 3;

FIG. 10 is a perspective view of an unauthorized unlocking prevention device according to an embodiment of the invention of claim 4;

11 is a rear view of the unauthorized unlocking prevention device of FIG.

[Explanation of symbols]

 1 keyhole 2 leg plate 3 cap body 4 magnet 5 lock 6 magnet key 7 magnet 8 magnet 9 recess 10 groove 11 stop plate 12 stop ring 13 through hole 14 operation hole 15 locking recess 16 pin tumbler 17 magnet key 18 magnet 19 locking Part 20 Through hole 21 Door 22 Collar part 23 Handle locking device

Claims (5)

[Claims] 1. A leg plate 2 that is inserted into a keyhole 1 of a lock 5 and is held at an insertion position by an internal tumbler structure, and a cap body that is connected to the rear end of the leg plate 2 and covers the front surface of the lock 5. A device for preventing unauthorized unlocking of a lock consisting of 3. 2. A leg plate 2 inserted into a keyhole 1 of a lock 5,
It comprises a cap body 3 which is connected to the rear end of the leg plate 2 and covers the front surface of the lock 5, and a magnet 4 is provided on the front side of the cap body 3, and the leg plate 2 is attached by the attraction force of the magnet 4. Unauthorized unlocking prevention device for the lock held at the insertion position. 3. A leg plate 2 inserted into a keyhole 1 of a lock 5,
A cap main body 3 that is continuously provided at the rear end of the leg plate 2 and covers the front surface of the lock 5, a magnet 8 that is provided on the cap main body 3, and that attracts the cap main body 3 to the front surface of the lock 5.
An unlocking and unlocking prevention device for a lock consisting of a magnetic key 6 provided with a magnet 7 that is abutted against the back surface of the cap body 3 and attracts the magnet 8 on the side of the cap body 3 to extract the leg plate 2 from the key hole 1. 4. A leg plate to be inserted into the key hole 1 of the lock 5 by providing a recess 9 on the front side of the lock 5 itself or a member to which the lock 5 is attached, and forming a groove 10 on the inner peripheral surface of the recess 9. A cap body 3 for covering the front surface of the lock 5 is provided at the rear end of the lock 2, and a C-shaped stop ring 12 having a through hole 13 at the end that engages with the groove 10 is transferred to the cap body 3. An unauthorized unlocking prevention device for a lock having an operation hole 14 on the back side for pushing an operation tool into the hole 13. 5. A leg plate to be inserted into the key hole 1 of the lock 5 by providing a recess 9 on the front side of the lock 5 itself or a member to which the lock 5 is attached, and forming a groove 10 on the inner peripheral surface of the recess 9. A cap body 3 for covering the front surface of the lock 5 is provided at the rear end portion of the lock 2, and a stop plate 11 that is fitted into the groove 10 and engages with the back surface of the cap body 3 is provided. apparatus.