JP2952241B1 - Method for preventing unauthorized unlocking of cylinder lock and cylinder lock - Google Patents

Abstract

An object of the present invention is to securely prevent unauthorized unlocking through a key insertion slot (30). A part for operating a tumbler mechanism (60) is disposed inside such that it cannot be accessed from a key insertion opening (30) exposed to the outside. As unlocking conditions, not only A but also B is added. A. The rotating ring 20 includes a key holder 24 for holding a key 40 inserted through the key insertion slot 30, and the key holder 24 is locked at a first position facing the key insertion slot 30 of the fixed frame 10. 40 is set in the key holder 24 through the key insertion slot 30. B. Rotating the rotating ring 20 holding the key 40 in the key holding part 24 to a position 180 ° away from the first position A in the circumferential direction. In the second position, the working part of the tumbler mechanism 60 is not accessible from the key slot 30.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique of a cylinder lock in which a part for operating a tumbler mechanism is arranged at a position circumferentially separated from a key insertion opening by a predetermined angle.
The present invention relates to technology for preventing unauthorized unlocking.

[0002]

BACKGROUND OF THE INVENTION Generally, a cylinder lock comprises a fixed frame including a circular guide, a rotating body connected to the frame and rotatable while being guided by the guide, and an unlocking mechanism depending on the presence or absence of a key. A tumbler mechanism that can be brought into a lockable state or an unlockable state. As the tumbler mechanism, there are a plurality of types such as a pin type and a disk type, and an effective key difference can be easily obtained in any case.

[0003] In such cylinder locks,
The part that activates the tumbler mechanism was located so that it could be accessed through the key insertion opening (ie, the key insertion opening). Therefore, there is a possibility that an unauthorized operation may be performed by operating from outside through the key insertion slot without using the key. In order to prevent unauthorized unlocking from the key insertion slot, a conventional technique of closing the key insertion slot itself with a cap or cover can be applied. For example, Japanese Utility Model Publication No. 6-33165 and Japanese Utility Model Publication No. 3-36678 are techniques based thereon.

[0004]

The technique of closing the key insertion opening with a cap or the like is based on the idea of eliminating an access opening for unauthorized unlocking. However, this technique has a problem that if the cap or the like is damaged, the key insertion opening is exposed to the outside again. Therefore, there are some difficulties in reliably preventing unauthorized unlocking.

Therefore, the present invention has been made in consideration of the above points,
An object of the present invention is to provide a technology capable of more reliably preventing unauthorized unlocking through a key insertion slot. Another object of the present invention is to provide a cylinder lock having a relatively simple structure, although illegal unlocking can be more reliably prevented.

[0006]

According to the present invention, a portion for operating the tumbler mechanism is arranged inside such that it cannot be accessed from a key insertion opening exposed to the outside. Specifically, the following two unlocking conditions A and B are set.
A. The rotating body has a key holding portion for holding a key inserted through the key insertion opening, and the key holding portion holds the key through the key insertion opening at the first position facing the key insertion opening of the fixed frame. Set in the part. B. The rotator holding the key in the key holder is moved from the first position of A to a second position in which the key holder of the rotator and the key insertion slot of the frame are circumferentially separated (for example, 90 ° in the circumferential direction). 18
(0 ° away). In the second position,
The operating part of the tumbler mechanism is located inside such that it is not accessible from the key slot. Thereby, access to the operating portion from the key insertion opening can be reliably prevented.

In a preferred form of the cylinder lock according to the present invention, the rotating body is a ring-shaped rotating ring,
The tumbler mechanism is of a pin type. The rotation ring is rotatable between a first position where the key holding portion faces the key insertion opening of the fixed side frame and a second position separated from the first position by a predetermined angle in the circumferential direction. .
And the key set in the key holder of the rotating ring,
In the first position, without hitting the pin tumbler of the tumbler mechanism, the pin tumbler is hit in the second position, and the operating member for unlocking is unlocked.

The present invention can be widely applied to cylinder locks. However, when locking and unlocking, in addition to inserting a key, a rotating body such as a rotating ring is rotated.
In particular, it is suitable for those which are not frequently used, for example, locks in safes and warehouses. The present invention can be applied not only as a single cylinder lock but also as a means for preventing unauthorized unlocking of another relatively large lock such as a padlock.

[0009]

EXAMPLE shown in the figure is a case of applying the lock of the safe, cross-sectional structure diagram of FIG. 1 is a cylinder lock, Figure 2 Figure 1
It is sectional drawing in alignment with line 2-2 in FIG. Outer frame 10
Is integrated with a safe to be locked, and forms a casing of the cylinder lock 100.
The frame 10 has a rectangular parallelepiped internal space 1 at the center.
2. There is a ring-shaped guide groove 14 near the outer periphery. The guide groove 14 has a circular shape over one circumference, and is a portion in which the rotating ring 20 fits and couples. The guide groove 14 has guide surfaces on both the inner and outer sides, and guides the rotating motion of the rotating ring 20 smoothly by the guiding action. Part of the guide groove 14
It faces the key insertion slot 30 on the frame 10 side. Also,
The internal space 12 at the center of the frame 10 is a portion for accommodating an operating member 50 for locking and unlocking. Actuating member 50
Cannot move in the locked state, that is, in the unlocking disabled state, but can slide and move in the internal space 12 as indicated by the arrow p in the unlocked state. This operating member 50
Is a handle of a safe (not shown) through the link member 80.
It is connected to. So, if you operate the handle of the safe,
The operating force is transmitted to the operating member 50 through the link member 80, whereby the operating member 50 can be slid and moved to open the safe. The link member 80 for transmitting the operation force is also connected to a dial device.

The tumbler mechanism 60 sets the unlockable state or the unlockable state. Tumbler mechanism 6
Numeral 0 denotes a pin system mainly composed of a pin tumbler 62 composed of a driver pin 62a and a tumbler pin 62b separated from each other. In the example shown in the drawing, the number of pins is four, and each of the pin tumblers 62 receives the force of the spring 64 while operating the operating member 50 and the frame 1.
The guide groove 14 can be moved in the radial direction from the inner portion of the guide groove 14. Each pin tumbler 6
The second driver pin 62a and the tumbler pin 62b are separated from each other by the inner wall surface 12w of the inner space 12 of the frame 10.
When it coincides with the so-called shear line, the driver pin 62a of each pin tumbler 62 can move together with the operating member 50.

It is the key 40 that makes the pin dividing portion coincide with the shear line. The key 40 is a predetermined key mountain 40.
k, and the cut portion of the pin can be made coincident with the shear line by the key mountain 40k. Key 40
The rotation ring 20 is inserted from the key insertion slot 30 of the frame 10.
Is set in the key holding section 24 of FIG. The key holding unit 24
The recess extends in the radial direction of the rotating ring 20, and the hole width of the outer portion 24o is small, and the hole width of the inner portion 24i is slightly larger (see FIGS. 3 and 4). The inner peripheral portion 24i having a large hole width is large enough to fit the pin, and the pin hits a step between the portion 24i and the outer peripheral portion 24o having a small diameter, so that it does not protrude further in the radial direction. It has become. The rotating ring 20 has a cam surface 24c at a position adjacent to the key holder 24 for guiding the movement of the pin tumbler 62.

The key 40 is set from the key insertion slot 30 of the frame 10 to the key holder 24 on the side of the rotating ring 20. At the stage of setting the key 40, the key 40 is set as shown in FIG.
As shown in FIG. 1, the rotary ring 20 is at a position (first position) separated by 180 ° in the circumferential direction from the state of FIG. When in the first position shown in FIG. 5, the key holder 24 faces the key insertion slot 30 on the frame 10 side. However, the tip of each internal pin tumbler 62
It hits the inner peripheral wall surface of the rotating ring 20 and is not affected by the key 40. At the time of actual unlocking, the rotating ring 20 holding the key 40 in the key holding portion 24 is
It is necessary to rotate 180 ° in the circumferential direction from the first position shown in FIG. 5 along the direction of arrow x to the second position shown in FIG. As the rotating ring 20 rotates, the cam surface 24c of the rotating ring 20 guides the pin tumblers 60 toward the key ridge 40k of the key 40 while contacting the tip of each pin tumbler 60. As a result, when the rotating ring 20 is rotated by 180 °, the division between the driver pin 62a and the tumbler pin 62b of each pin tumbler 62 matches the inner wall surface 12w (the so-called shear line) of the internal space 12 of the frame 10. Will do.

In order to facilitate insertion and extraction of the key 40 from the key holding portion 24, for example, a crescent-shaped notch is provided in the rotating ring 20, and a hook portion is provided on one surface of the key 40. Of course you can. Further, a stopper 70 is provided on the link member 80. The stopper 70 is inserted into the notch groove 72 on the rotating ring 20 side only when the rotating ring 20 is at the second position shown in FIG. Allow 50 moves. The stopper 70 is provided on the cam surface 2 of the rotating ring 20.
The act of unauthorized unlocking is completely shut out using the portion of 4c.

[Brief description of the drawings]

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

FIG. 2 is a sectional view taken along line 2-2 of FIG.

FIG. 3 is a sectional view of a key holding unit.

FIG. 4 is a partial front view of a key holding unit facing a key insertion slot.

It is a cross-sectional structure diagram showing the different alternative states and [5] Figure 1 of the cylinder lock of Figure 1.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Frame 12 Internal space 14 Guide groove (guide part) 20 Rotating ring (rotating body) 24 Key holding part 24c Cam surface 30 Key insertion opening 40 Key 50 Operating member 60 Tumbler mechanism 62 Pin tumbler 100 Cylinder lock

Claims (4)

(57) [Claims] 1. A frame including a key insertion opening and a circular guide portion, and a key holding portion for holding a key inserted through the key insertion opening, and coupled to the frame,
A rotator that can be rotated while being guided by the guide portion, and a tumbler that can be put into an unlockable state or an unlockable state depending on whether or not a key is set in a key holding portion of the rotator. This is a method for preventing unauthorized unlocking of a cylinder lock provided with a mechanism.
And B. A method for preventing unauthorized unlocking of a cylinder lock. A. Setting the key in the key holder through the key insertion opening at a first position where the key holding unit of the rotating body faces the key insertion opening of the frame; B.
The rotating body holding the key in the key holding part is the first of the A
From the above position to the second position where the key holding portion of the rotating body and the key insertion opening of the frame are circumferentially separated. 2. The unauthorized unlocking prevention method according to claim 1, wherein said tumbler mechanism is of a pin type including a driver pin and a tumbler pin. 3. A frame integrated with an object to be locked, the frame including a key insertion port, a ring-shaped guide groove and an internal space, and a locking and unlocking device housed in the internal space of the frame. Member for holding a key inserted through the key insertion slot, a rotating ring rotatable while being guided by a guide groove of the frame, the operating member, the frame and the guide groove A tumbler mechanism including a pin tumbler movable in a radial direction over the cylinder lock, wherein the rotation ring has a first position where the key holding portion faces a key insertion opening of the frame, and a first position thereof. The key can be rotated between a position and a second position circumferentially separated by a predetermined angle, and a key set in a key holding portion of the rotating ring is the first key. A cylinder lock, wherein the operating member is unlocked in the second position without hitting the pin tumbler of the tumbler mechanism in the second position. 4. The cylinder lock according to claim 3, wherein the rotating ring includes a cam surface for guiding the movement of the pin tumbler at a portion adjacent to the key holding portion.