JPH03247877A - Cylinder lock - Google Patents

Abstract

PURPOSE:To prevent unlocking of a cylinder lock by a false key by preventing the insertion of picking tool by a method in which a small key inserting hole is formed in a rotor handle and a cylinder, and a thin plate key to be broken by less than breaking torque of a tumbler is used. CONSTITUTION:A tumbler 4 movable toward the direction of crossing the axial direction is provided in a cylinder 2 rotatably housed in housings 1. A rotor handle 5 is rotatably held on the outside of the cylinder 2 and a small key inserting hole 7 is formed in the handle 5 and the cylinder 2. A thin plate key to be broken by less than the breaking torque of the tumbler 4 and capable of being inserted into the hole 7 is also provided. When the thin plate key is inserted into the hole 7 and reaches a given position in the cylinder 2, the cylinder 2 and the handle 5 are connected in the turning direction by a rotor lock pin 12 as the tumbler 4 moves to make unlocking possible. Illegal unlocking can thus be made impossible because the thin plate key is broken by less than breaking torque of the tumbler 4 when a false key is inserted.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a tumbler type cylinder lock, and particularly to a cylinder lock with improved ability to prevent unauthorized release.

(Prior Art) Tumbler type cylinder locks have conventionally been used in main switches of motorcycles, steering lock devices, and other fields.

This tumbler type cylinder lock houses a key rotor in the cylinder body, and by inserting the key into the key groove, the tumbler can be moved and the key rotor rotated, and locking and unlocking are performed by rotation of the key rotor. be.

However, conventional cylinder locks can be illegally unlocked by the following methods.

■Method by picking. Here, picking refers to the act of applying torque to the rotor using a special tool that is hooked into the keyhole, and unlocking the lock by sequentially aligning the tumblers with long and thin pins.

■A method of forcibly rotating the rotor (cylinder) using a drill to break the tumbler.

■A method of forcibly rotating the rotor (cylinder) using a flathead screwdriver and pliers to break the tumbler.

■How to make an unauthorized key without a step in the tumbler engagement part of the official key and break the tumbler.

Various cylinder locks have been developed to prevent such unauthorized unlocking of cylinder locks. For example, the Tokuko Sho 60
-The device shown in Publication No. 12511 can be locked and unlocked simply by inserting a thin plate key into the loose insertion hole without rotating the key, and in particular uses a flexible plate of about 0.2 m as the key. It is also possible to use a curved sliding type, so that the width of the free insertion hole can be made as small as possible, thereby almost completely eliminating the possibility of illegal objects being inserted through the free insertion hole.

(Problem to be solved by the invention) Since the above cylinder lock has a thin loose insertion hole,
The picking tool does not fit. In other words, the rigidity of the tool is lost to the tumbler return spring. Therefore, it is possible to prevent unauthorized cancellation due to the above-mentioned (2) picking.

Further, when attempting to unlock the cylinder lock with an unauthorized key, the unauthorized key is also made of a thin plate, so the unauthorized key will be broken with a torque weaker than the breaking torque of the tumbler. Therefore, it is possible to prevent unauthorized release using the unauthorized key.

However, in the above-mentioned cylinder lock, the key insertion hole of the lock body (the tumbler moves when the key is inserted, allowing free rotation or axial movement, generally referred to as a rotor or cylinder) is exposed to the outside. Because of this, it is possible to drive in with a flat head screwdriver or dig in with a drill, making it possible to forcibly move the lock body.

For this reason, it is impossible to prevent the above-mentioned (1) unauthorized release using a drill, and (3) unauthorized release using a flat head screwdriver, pliers, etc.

The present invention has been made in consideration of the above circumstances, and an object of the present invention is to provide a cylinder lock that cannot be unlocked illegally by any method such as picking, drilling, flat head screwdriver, unauthorized key, etc.

[Structure of the invention]

(Means for Solving the Problems) In order to achieve the above object, the present invention rotatably accommodates a cylinder in a housing, includes a tumbler movable in a direction crossing the axial direction, and A rotor and knob is rotatably held on the outside of the cylinder, a thin key insertion hole is formed in the rotor and knob and the cylinder, and a thin plate key that can be inserted into the key insertion hole and breaks at a tumbler breaking torque or less is provided, A rotor lock pin is provided which connects the cylinder and the rotor/knob in the rotational direction by movement of the tumbler when the thin plate key is inserted into the key insertion hole and reaches the proper position in the cylinder.

(Function) Since a thin key insertion hole is formed in the rotor/knob and cylinder, a picking tool cannot be inserted, and unauthorized release due to picking can be prevented. Further, even if an attempt is made to unlock the door with an unauthorized key, the unauthorized key also becomes a thin plate, so the unauthorized key will be broken with a torque weaker than the breaking torque of the tumbler, thereby preventing unauthorized unlocking by the unauthorized key.

In addition, since the cylinder is housed in the housing and the rotor/knob is rotatably held outside the cylinder, even if the rotor/knob is rotated with a flathead screwdriver or drill, only the rotor/knob will rotate and the cylinder will (lock body)
does not rotate. Therefore, unauthorized release using a flat head screwdriver, drill, etc. can be prevented.

(Example) Hereinafter, a first example of the cylinder lock according to the present invention will be described.
This will be explained with reference to FIGS. 7 to 7.

In the cylinder lock, a cylinder 2 is rotatably housed in a substantially cylindrical housing 1, and a connecting shaft 3 is connected to the inner side of the cylinder 2 (on the left side in FIGS. 1 to 3). The connecting shaft 3 is connected to a lock bar (not shown),
By rotating together with the cylinder 2, locking and unlocking are performed.

Inside the cylinder 2, a large number of tumblers 4 are provided which are movable in a direction perpendicular to the axial direction of the cylinder 2. A rotor-cum-knob 5 is provided on the outer side of the cylinder 2 (on the right side in FIGS. 1 to 3), and guards the outer side of the cylinder 2. A base portion 5a of the rotor/knob 5 is rotatably held in the housing 1 and rotates independently of the cylinder 2. The rotor-cum-knob 5 is formed in an external shape that allows it to be easily rotated by holding it between fingers.

A thin key insertion hole 7 into which a thin plate key (having a thickness of about 0.5 mm or less) 6 can be inserted from the outside is formed in the rotor/knob 5 and the cylinder 2. Thin key 6
has the strength to break at less than the breaking torque of the tumbler 4,
The material is, for example, non-magnetic stainless steel. A key guide 8 for guiding insertion of a thin plate key 6 is provided on the rotor-cum-knob 5. Further, the cylinder 2 is provided with a key guide/tumbler guide 9 that guides the insertion of the thin plate key 6 and guides the movement of the tumbler 4.

The key guide 8 and the key guide/tumbler guide 9 have, for example, a two-part structure in order to facilitate the formation of the thin key insertion hole 7, and are inserted into the cylinder 2 or the rotor/knob 5 (
or cast).

The phases of the rotor/knob 5 and the cylinder 2 are matched by a rotor positioning ball 10, so that the rotor/knob 5 and the key insertion hole 7 of the cylinder 2 are aligned. The rotor positioning ball 10 is always urged by a return spring 11 from the rotor-cum-knob 5 side toward the cylinder 2 side.

The cylinder 2 is provided with a rotor lock pin 12 that can connect the rotor-cum-knob 5 and the cylinder 2 in the rotational direction. The rotor lock pin 12 is biased from the cylinder 2 toward the rotor/knob 5 by a lock pin spring 13, and is engaged with a lock pin insertion hole 14 formed in the rotor/knob 5. The cylinder 2 is connected in the rotational direction.

When the thin plate key 6 is not inserted into the key insertion hole 7,
As shown in FIGS. 1 and 5, the tumbler 4 is moving upward in FIGS. 1 and 5 due to the bias of the tumbler return spring 15, and the rotor lock pin 1
It comes into contact with the saw-shaped part formed on the side of 2,
The rotor lock pin 12 is pushed inward against the bias of the lock pin spring 13.

Also, when the thin plate key 6 is inserted into the key insertion hole 7,
As shown in FIGS. 2 and 6, the tumbler 4 is pushed by the thin plate key 6, and the tumbler return spring 15
When the rotor lock pin 12 moves backward against the bias of the rotor lock pin 12 and disengages from the rotor lock pin 12, the rotor lock pin 12 is pushed into the lock pin insertion hole 1 by the bias of the lock pin spring 13.
4 to connect the cylinder 2 and the rotor/knob 5 in the rotational direction.

Note that the reference numeral 16 indicates a cylinder thrust stopper ring.

In this cylinder lock, when unlocking with the regular thin plate key 6, first, the rotor positioning ball 10 is used to unlock the cylinder lock.
The cylinder 2 and the rotor/knob 5 are aligned in phase to align the key insertion hole 7, and then the thin plate key 6 is inserted into the key insertion hole 7 from the right side in FIGS. 1 to 3.

When the thin plate key 6 is inserted, the effective portion of the thin plate key 6 causes the tumbler 4 to retreat in a direction perpendicular to the axial direction of the cylinder 2 against the bias of the tumbler return spring 15.

When the tumbler 4 moves, the engagement between the tumbler 4 and the rotor lock pin 12 is disengaged, and the rotor lock pin 12 moves toward the rotor knob 5 due to the bias of the lock pin spring 13 and is inserted into the lock pin insertion hole 14. Engage cylinder 2
and the rotor/knob 5 are integrally coupled in the rotational direction.

So, if you pinch the rotor/knob 5 between your fingers and rotate it,
The cylinder 2 rotates at the same time, and the connecting shaft 3 connected to the cylinder 2 also rotates. When the connecting shaft 3 rotates, a lock bar (not shown) moves and the locked state is released.

Next, if an attempt is made to illegally unlock the cylinder lock with a picking tool, a normal picking tool cannot be inserted into the thin key insertion hole 7, and unauthorized unlocking becomes impossible. Furthermore, if the picking tool is made thin, it can be inserted into the key insertion hole 7, but the tumbler return spring 15
Since the rigidity of the pi-soking tool is weakened by the bias, it is still impossible to perform unauthorized release.

If an attempt is made to release the unauthorized key using an unauthorized key, the unauthorized key also becomes a thin plate, and the unauthorized key is broken with less than the breaking torque of the tumbler 4. Therefore, unauthorized release cannot be performed even with an unauthorized key.

If an attempt is made to break the tumbler by forcibly rotating the cylinder 2 with a drill, flat head screwdriver, pliers, etc., the cylinder 2 cannot be directly rotated because it is housed within the housing 1.

Even if the rotor/knob 5 is rotated, the rotor/knob 5 and the cylinder 2 are normally not connected and can freely rotate with each other, so only the rotor/knob 5 rotates and the cylinder 2 rotates. do not. Therefore, it is not possible to illegally release the license by using a drill, a flathead blower, or the like.

As described above, according to the above embodiment, picking, drilling,
It is possible to provide a cylinder lock that cannot be unlocked illegally by any method such as a flathead screwdriver or an unauthorized key.

Note that since the thin plate key 6 can be formed into a card shape, a key holder is not required and it can be stored in a wallet or the like like any other card. In this case, by making the material of the thin plate key 6 non-magnetic stainless steel, it is possible to prevent an adverse effect on other cards.

〔Effect of the invention〕

As explained above, in the present invention, since thin key insertion holes are formed in the rotor/knob and cylinder, a picking tool cannot be inserted, and unauthorized release due to picking can be prevented.

Furthermore, even if an attempt is made to unlock the door with an unauthorized key, since the unauthorized key also becomes a thin plate, the unauthorized key will break with less than the breaking torque of the tumbler, thereby preventing unauthorized unlocking by the unauthorized key.

In addition, since the cylinder is housed in the housing and the rotor/knob is rotatably held outside the cylinder, even if the rotor/knob is rotated with a flathead screwdriver or drill, only the rotor/knob will rotate and the cylinder will (lock body)
does not rotate. Therefore, unauthorized release using a flat head screwdriver, drill, etc. can be prevented.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view showing an embodiment of the cylinder lock according to the present invention, FIG. 2 is a longitudinal cross-sectional view showing the thin plate key inserted into the key insertion hole in the above embodiment, and FIG. 2 is a cross-sectional view taken along line m-m in FIG.
V-IV line arrow sectional view, Figure 5 is V-V in Figure 1
6 is a sectional view taken along the line VI-VI in FIG. 2, and FIG. 7 is a side view showing the thin plate key in the above embodiment. 1...Housing, 2...Cylinder, 3...Connection shaft, 4...Tumbler, 5...Rotor and knob, 6...Thin plate key, 7...Key insertion hole, 12...・Rotaro Nkupin, 13...Lock pin spring,
14...Lock bin insertion hole, 15...Tumbler return spring.

Claims (1)

[Claims] A cylinder is rotatably accommodated in a housing, a tumbler movable in a direction crossing the axial direction is provided in the cylinder, a rotor/knob is rotatably held outside the cylinder, and the rotor/knob and A thin key insertion hole is formed in the cylinder, and a thin plate key that can be inserted into the key insertion hole and breaks at less than the tumbler breaking torque is provided, and this thin plate key is inserted into the key insertion hole and comes to the correct position in the cylinder. A cylinder lock, sometimes comprising a rotor lock pin that connects the cylinder and the rotor/knob in the rotational direction by movement of the tumbler.