JP2003247364A - Locking and unlocking device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a locking and unlocking device capable of increasing resistance force against an illegal unlocking such as a picking or the like, preventing the unlocking when an unlocking operation is made without using any duplicate key such as an illegal unlocking operation or the like and promoting security. <P>SOLUTION: The locking and unlocking device 1 is so constituted that tumbler pins 17 are moved to a cylinder lock 3 having the tumbler pins 17 penetrating an outside cylinder 7 and an inside cylinder 11 by inserting the duplicate key 51 into a key-hole 13 and that a shear line 25 is made to coincide with a boundary section 27 between the outside and inside cylinders 7 and 11 to release rotation restriction of the inside cylinder 7. The device 1 includes the inside cylinder 11 equipped with the circular key hole 13, the duplicate key 51 having a columnar insertion section 51 and having a dimple 59 formed in the outer circumferential surface, an engaging projection section 33 projected to the inside of the key hole 13 and an engaging recess section 61 formed on the outer circumferential surface of the duplicate key 51 to be engaged with the engaging projection section 33. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a locking / unlocking device provided with a cylinder lock and a key for locking / unlocking the cylinder lock.

[0002]

2. Description of the Related Art In recent years, a crime called picking in which a tumbler in a key hole is operated by a special tool for illegal unlocking has frequently occurred. Therefore, in order to prevent such unauthorized unlocking, measures are being taken to prevent unauthorized unlocking by making the cylinder lock portion of the locking / unlocking device difficult to pick.

As this type of cylinder lock, as shown in FIGS. 8 and 9, for example, there is one using a recess 73 in the shape of a mortar, a so-called key 73 having dimples 71 provided at predetermined positions on the front and back surfaces. In this cylinder lock, the tumbler pin is moved according to the dimples 71 of the key 73 inserted into the key hole, and the shear line of the tumbler pin is aligned with the boundary with the outer cylinder externally inserted into the inner cylinder. Release the rotation restriction from the outer cylinder and unlock.

As shown in FIG. 11, this cylinder lock 75
Is the tumbler pin 77 with the key 73 removed.
Is pushed by the spring 79 and penetrates the outer cylinder 81 and the inner cylinder 83, so that the inner cylinder 83 cannot be rotated. On the other hand, as shown in FIG. 10, when the compound key 73 is inserted into the key hole 76, the tumbler pin 77 at a predetermined position is retracted, and the shear line 85 of the tumbler pin 77 causes the outer cylinder 81 and the inner cylinder 8 to move.
The inner cylinder 83 can be rotated in line with the boundary portion 87 with respect to 3.

[0005]

However, in the above-described dimple type cylinder lock, the tumbler pin at a predetermined position is retracted in accordance with the dimple of the key inserted in the key hole, and the shear line of the tumbler pin is inserted into the outer cylinder. In terms of canceling the rotation restriction of the inner cylinder in conformity with the boundary with the cylinder, it follows the conventional pin cylinder mechanism having a structure in which peaks and valleys are formed on the side edges of the joint key.

In the cylinder lock, since the tumbler pin is contacted in a direction perpendicular to the dimple forming surface of the lock, it is not possible to secure a large distance in the contacting direction of the tumbler pin, increasing the difference in the key. Becomes difficult. That is, the distance in the direction in which the tumbler pin abuts depends on the thickness of the key. On the other hand, if the thickness of the compound key is increased, the key hole becomes larger, which makes it easier to unlock the lock.

Further, the cylinder lock having the above-mentioned structure has a construction in which a compound key formed in a substantially plate shape is used, and since the shape of the key hole is formed in a substantially slit shape, both end portions of the slit are utilized. It has a structure that enables unauthorized unlocking operations such as rotating the cylinder lock, and it is also possible to deal with unauthorized operations such as picking with regard to the shape of the lock and the key hole. Is desired.

The present invention has been made in view of the above circumstances, and provides a locking / unlocking device having a structure of a lock and a cylinder lock capable of improving the resistance against illegal unlocking such as picking. In addition, unauthorized unlocking operations,
An object of the present invention is to obtain a locking / unlocking device in which unlocking is impossible when the unlocking operation is performed without using a lock and the crime prevention is improved.

[0009]

[Means for Solving the Problems] Next, means for solving the above problems will be described with reference to the drawings corresponding to the embodiments. Locking / unlocking device 1 according to claim 1 of the present invention
Includes an outer cylinder 7 and an inner cylinder 11 that is rotatable with respect to the outer cylinder 7, and a cylinder lock 3 in which a tumbler pin 17 is disposed so as to extend across the outer cylinder 7 and the inner cylinder 11. By inserting a compound key 51 into the key hole 13 formed in the inner cylinder 11, the tumbler pin 17 is moved from the key hole 14 to a predetermined position in the radial direction, and a boundary portion between the outer cylinder 7 and the inner cylinder 11 is moved. A locking / unlocking device 1 for releasing rotation restriction of the inner cylinder 7 by aligning a shear line 25 of the tumbler pin 17 with the inner cylinder 11 having a key hole 13 formed in a circular hole shape. An insertion part 55 to be inserted into the key hole 13 is formed in a cylindrical shape having a continuous circular cross section, and a recessed part 59 is formed on the outer peripheral surface of the insertion part 55 so as to correspond to the tumbler pin 17. A predetermined position in the key hole 13 of the inner cylinder 11 An engaging projection 33 that is disposed and projects inward of the key hole 13, and an engaging recess 61 that is formed on the outer peripheral surface of the compound key 51 and that engages with the engaging projection 33. Is characterized by.

According to this locking / unlocking device 1, the insertion portion 55 of the compound key 51 has a cylindrical shape with a circular cross section, and the key hole 13 is formed.
Since the shape of the inner cylinder 11 is a circular hole, even if a tool or the like is locked in the key hole 13 when an illegal unlocking operation is performed on the cylinder lock 3, the inner cylinder 11
It is impossible to perform an operation to rotate the, so that crime prevention can be obtained.

According to a second aspect of the present invention, the locking / unlocking device is characterized in that the insertion portion 55 of the compound key 51 is provided with a small diameter portion 57 having a different outer diameter via a step portion in the axial direction.

According to this locking / unlocking device 1, not only the concave portion (dimple) 59 but also the small diameter portion 5 is formed in the shape of the compound key 51.
7 can be formed, and the combination of the small-diameter portion 57 and the concave portion 59 can form a key difference.

In the locking / unlocking device according to the third aspect of the present invention, the engagement projection 33 is formed in a long ridge shape parallel to the axial direction of the inner cylinder 11, and the engagement recess 61 is formed by: It is characterized in that it is formed in a long groove parallel to the axial direction of the insertion part 55.

According to this locking / unlocking device, the engagement state between the engagement convex portion 33 and the engagement concave portion 61 becomes elongated in the axial direction,
The rotation operation of the engagement key 51 on the engagement recess 61 side can be reliably transmitted to the inner cylinder 11 on the engagement projection 33 side, and the locking / unlocking operation of the inner cylinder 11 by the engagement key 51 can be performed.

According to a fourth aspect of the present invention, there is provided the locking / unlocking device, wherein the inner cylinder 1
1 is formed with an insertion hole 29 in the radial direction.
9 is provided with a sliding piece 31 whose tip is the engaging convex portion 33 so as to be slidable in the radial direction of the inner cylinder 11, and the inner peripheral surface of the outer cylinder 7 corresponds to the insertion hole 29. A space portion 35 is formed in the space portion 35, the base end of the sliding piece 31 is abutted in the space portion 35 to support the engaging convex portion 33 in the key hole 13 in a protruding state, and the sliding piece 31 is also formed. A support piece 37 that is crushed by sliding is provided.

According to this locking / unlocking device 1, when the engaging convex portion 33 is pressed when a tool or the like is inserted into the key hole 13 in order to perform an unauthorized unlocking operation, the engaging hole 33 is inserted into the insertion hole 29. Along with this, the sliding piece 31 moves backward to the space portion 35 of the outer cylinder 7, and the support piece 37 supporting the sliding piece 31 is crushed in the space portion 35. As a result, the sliding piece 31 is located at the boundary portion 27 between the outer cylinder 7 and the inner cylinder 11,
It becomes impossible to rotate the inner cylinder 11 with respect to the outer cylinder 7, that is, an unauthorized unlocking operation becomes impossible.

In the locking / unlocking device of the fifth aspect, the support piece 37 is made of a thin circular pipe.

According to this locking / unlocking device, since the base end of the sliding piece 31 located at the boundary 27 between the inner cylinder 11 and the outer cylinder 7 and the supporting piece 37 are not in close contact with each other. During the normal operation, the sliding piece 31 and the supporting piece 37 do not hinder the rotation of the inner cylinder 11 with respect to the outer cylinder 7 without any trouble.

[0019]

1 is a side sectional view showing an embodiment of a locking / unlocking device according to the present invention, FIG. 2 is a side sectional view of a cylinder lock of the locking / unlocking device, and FIG. 3 is a cylinder of the locking / unlocking device. It is a front view of a lock.

As shown in FIG. 1, the locking / unlocking device 1 of the present invention.
The cylinder lock 3 constituting the outer cylinder 7 is provided inside the outer cylinder 5.
Install so that they cannot rotate relative to each other. The outer cylinder 5 has a base end 5a fixed to a lock box (not shown) on the main body side of the lock mechanism, and the front half 5
b protrudes from the door surface, and the outer circumference is covered with a decorative ring 9 or the like. An inner cylinder 11 having a key hole 13 is rotatably provided inside the outer cylinder 7. Through holes 15 are formed in the outer cylinder 7 and the inner cylinder 11 in the radial direction across the both. The through hole 15 has one end opening to the key hole 13 and the other end opening to the outer peripheral surface of the outer cylinder 7.

A plurality of through holes 15 are arranged along the axial direction of the key hole 13, and as shown in FIG. 4, at each of left and right positions inclined by about 45 ° with respect to the axis of the key hole 13. A plurality of holes are provided along the axial direction of the key hole 13, that is, in the present embodiment, the through holes 15 are three directions with respect to the axial direction of the key hole 13.

The through hole 15 has a small diameter hole on the front end side opening in the key hole 13 and a large diameter hole on the rear end side opening on the outer peripheral surface of the outer cylinder 7. The boundary between the small diameter hole and the large diameter hole is a step portion 16 in the inner cylinder 11.

A tumbler pin 17 is provided in each through hole 15. The tumbler pin 17 is the outer cylinder 7.
Is attached to the through-hole 15 in advance before attaching to the outer casing 5. The tumbler pin 17 is a stepped pin 18 on the tip side.
And a driver pin 19 on the rear end side. The stepped pin 18 has a flange-shaped corner portion 18a on the rear end side,
The tip side is formed in a conical shape. The driver pin 19 is
It has a recess 19a on the rear end side and is coaxial with the stepped pin 18 and contacts the rear end surface of the stepped pin 18.

In the tumbler pin 17, the corner 18a of the stepped pin 18 comes into contact with the step 16 of the through hole 15,
With the tip of the stepped pin 18 protruding to the key hole 13 by a predetermined size, further projection is stopped (see FIG. 2). A curved thin plate-shaped lid member 21 is attached to the outer peripheral surface of the outer cylinder 7 to close the opening of the through hole 15 located on the outer peripheral surface of the outer cylinder 7.

Recess 21 and recess 19 of driver pin 19
A compressed spring 23 is arranged between the a and the a. Therefore, the tumbler pin 17 is in a state where the tip of the tumbler pin 17 is projected into the key hole 13 in a normal state (when the compound key is not inserted (see FIG. 2)), and the spring 23 is pressed by the tip.
It is adapted to retreat into the through hole 15 against the biasing force of. The tumbler pin 17 is divided into two parts, a stepped pin 18 and a driver pin 19, and the boundary between them is a so-called shear line 25. The shear line 25 is set at a different position from the tip of each tumbler pin 17. That is, the rotation restriction of the inner cylinder 11 is not released unless the shear line 25 of each tumbler pin 17 coincides with the boundary portion 27 with the outer cylinder 7.

A pair of insertion holes 2 are formed at the inner side of the key hole 13 of the inner cylinder 11 so as to penetrate in the radial direction and face each other.
9 is formed. Each of the insertion holes 29 is an elongated hole that is long in the axial direction of the inner cylinder 11, and sliding pieces 31 that are arranged so as to face each other around the axis of the inner cylinder 11 are fitted and inserted. Sliding piece 31
Is formed in a substantially rectangular plate shape and is slidable in the insertion hole 29 in the radial direction of the inner cylinder 11. The length of the sliding piece 31 is formed to be slightly longer than the thickness of the inner cylinder 11. Also, the sliding piece 3
The front end of 1 is formed into a curved surface and has a substantially semicylindrical shape to form an engaging projection 33. With the sliding piece 31 fitted and attached to the inner cylinder 11, the engaging convex portion 33 at the tip is provided with the key hole 1.
It projects like a ridge in 3. The base end of the sliding piece 31 is substantially flush with the outer peripheral surface of the inner cylinder 11.

A space portion 35 is formed in the inner peripheral surface of the outer cylinder 7 at a position opposite to the inner peripheral surface of the inner cylinder 11 so as to correspond to each insertion hole 29. The space portion 35 is formed in a substantially recessed groove shape along the axial direction of the outer cylinder 7. A support piece 37 is fitted in the groove-shaped space 35. The support piece 37 is made of a material that can be crushed, preferably a material that is deformed by an external force and does not return to its original shape, that is, a plastic material. In the present embodiment, the support piece 37 is formed of a circular pipe, and is preferably made of a circular pipe. , Made of thin pipe. The support piece 37 is located in the space 35, does not protrude from the inner peripheral surface of the outer cylinder 7, and
Abuts on the base end of the sliding piece 31.

In the boundary portion between the inner cylinder 11 and the outer cylinder 7, the inner cylinder 11 with respect to the outer cylinder 7 is located at a position (lower part in the drawing) facing the position where the tumbler pin 17 is arranged.
Locking portion 3 for temporarily holding the rotation of the inner cylinder 11 and for providing a click feeling when the inner cylinder 11 is rotated with respect to the outer cylinder 7.
9 are provided. The locking portion 39 is a substantially rod-shaped locking member 41.
And a biasing member 43 such as a spring that biases the locking member 41 from the inner peripheral surface of the outer cylinder 7 to the outer peripheral surface of the inner cylinder 11.
A groove 45 is formed on the outer peripheral surface of the inner cylinder 11 along the axial direction, and the locking member 41 is engaged with the groove 45 to temporarily stop the rotation of the inner cylinder 11 with respect to the outer cylinder 7.

A connecting daruma 47, which is interlockingly connected to a lock mechanism (not shown), is connected to the rear end of the inner cylinder 11. The connecting duller 47 is rotatably supported at the rear end of the outer cylinder 7.

Next, the compound key 51 used in the locking / unlocking device 1 will be described. As shown in FIG. 5, the compound key 51 is composed of a knob portion 53 and an insertion portion 55.
The knob portion 53 is formed in a substantially rectangular plate shape. Insertion part 55
Is formed in a columnar shape having a continuous circular cross section. As shown in FIG. 5, the insertion portion 55 of the present embodiment has a small diameter in the middle portion, that is, the outer diameter is different via the step portion, is formed in multiple steps, and is provided with the small diameter portion 57. The tip is formed in a conical shape.

On the outer peripheral surface of the insertion portion 55, there is formed a so-called dimple 59, which is a substantially mortar-like recess for retracting the tumbler pin 17 into the through hole 15 and disposing the tumbler pin 17 at a predetermined position in the axial direction. The dimple 59 has such a depth that the positions of the different sea lines 25 coincide with the boundary portion 27 as described above. The dimple 59 is also combined with the outer diameter of the insertion portion 55, that is, the diameter of the small diameter portion 57 in the insertion portion 55 and the depth of the dimple 59 realize a key difference.

Further, on both side surfaces of the distal end portion of the insertion portion 55 of the compound key 51, which are located on the outer side in the radial direction, FIG.
As shown in FIG. The engagement concave portion 61 is a substantially U-shaped concave groove that is elongated along the axial direction of the insertion portion 55. In the present embodiment, these engaging recesses 61 are arranged in a direction orthogonal to the plate surface of the knob portion 53. Then, the engaging projection 33 in the key hole 13 of the inner cylinder 11 is configured to be fitted to each other, that is, the outer shape of the engaging projection 33 and the groove shape of the engaging recess 61 are set to be substantially the same shape. It

Next, the locking / unlocking device 1 configured as described above.
The operation of will be described. As shown in FIGS. 2 and 3, when the compound key 51 is not inserted, each tumbler pin 17 is biased by the spring 23 so that the tip of the tumbler pin 17 projects into the key hole 13. Further, the shear line 25 of each tumbler pin 17 is discontinuous, and as a result, the driver pin 19 is arranged at the boundary portion 27 between the outer cylinder 7 and the inner cylinder 11. Therefore, the rotation of the inner cylinder 11 is restricted with respect to the outer cylinder 7.

When the regular compound key 51 shown in FIG. 5 is inserted into the cylinder lock 3, the engaging recess 61 at the tip of the compound key 51 engages with the engaging protrusion 33 in the key hole 13. . At the same time, each tumbler pin 17 falls into a predetermined dimple 59 provided on the joint key 61, or the tumbler pin 17 abuts on the outer peripheral surface of the small diameter portion 57 or the like of the insertion portion 55, and the through hole 15 of the through hole 15 is formed. Move to a predetermined position in the axial direction. As a result, the shear line 2 of each tumbler pin 17
As shown in FIG. 1, 5 is continuous on a straight line and coincides with the boundary portion 27 between the outer cylinder 7 and the inner cylinder 11. That is, the inner cylinder 11
Is in a state where the rotation restriction is released.

Then, when the joint key 51 is rotated, the engagement concave portion 61 and the engagement convex portion 33 are engaged with each other in the circumferential direction in the axial direction, transmitting the operation force in the rotation direction and sliding. The base end of the moving piece 31 and the support piece 37 are separated from each other, and the tumbler pin 17 is separated at the boundary of the shear line 25, and the inner cylinder 11 is rotated with respect to the outer cylinder 7, that is, unlocked.

The insertion part 55 of the key 51 and the key hole 1
3 means that the outer diameter of the compound key 51 and the inner diameter of the key hole 13 are in a fitted state and the engaging concave portion 61 and the engaging convex portion 33 are in a fitted state at the tip portion thereof. The shape of the inside of the hole 13 and the shape of the fitting key insertion portion 55 match, so that the rotating operation of the fitting key 51 is transmitted to the inner cylinder 11, and the inner cylinder 11 can be rotated.

Here, for example, when a tool such as a screwdriver is used for the inner cylinder 11 of the cylinder lock 3 in order to illegally unlock the locking / unlocking device 1, the tool or the like is inserted into the key hole 13. Although it will be inserted, it cannot be meshed with the engaging convex portion 33 because it has a shape that does not fit properly into the key hole 13, and thus the engaging convex portion 33 is pressed. Then, the sliding piece 31 having the engaging convex portion 33 as the tip slides radially outward in the insertion hole 29 of the inner cylinder 11 and presses the supporting piece 37 that is in contact with the base end. . As shown in FIG. 7, the supporting piece 37 is deformed, that is, is crushed by the pressing force, and the sliding piece 31 slides and retreats in the insertion hole 29, and its base end is the space portion 35 of the outer cylinder 7.
It will be moved in. As a result, the sliding piece 31 is positioned at the boundary portion 27 between the inner cylinder 11 and the outer cylinder 7, and even if the sliding piece 31 is forced to rotate, the inner cylinder 11 cannot be rotated, that is, Lock operation becomes impossible.

Therefore, the locking / unlocking device 1 configured as described above
Then, in order to rotate the inner cylinder 11 of the cylinder lock 3 with respect to the outer cylinder 7, a compound key 51 for moving each tumbler pin 17 to a predetermined position in the axial direction of the through hole 15 is inserted into the key hole 13. The shear line 25 of each tumbler pin 17 is connected to the boundary 2
7, the shape of the key hole 13 and the outer shape of the insertion portion 55 of the dowel key 51 are matched in the key hole 13, and the engaging concave portion 61 and the engaging convex portion 33 are fitted to each other. Should be

As a result, the lock hole 13 of the cylinder lock 3 has a circular shape as compared with the conventional locking / unlocking device which rotates the inner cylinder of the cylinder lock by using the flat key, and thus the key is locked. Even if an illegal operation is performed on the hole 13, that is, an attempt is made to rotate the inner cylinder 11, it is structurally impossible to rotate the inner cylinder 11 because the shape does not hang in the rotation direction. It is possible to obtain a locking / unlocking device with high crime prevention. Further, in particular, compared to the conventional flat-plate-shaped compound key, by making the shape of the insertion part 55 of the compound key 51 cylindrical, the depth of the dimples 59 can be configured in multiple stages, and the insertion part 55 Since it is possible to combine the outer diameter with the small-diameter portion 57 or the like, it is possible to increase the number of different combinations.

According to the above locking / unlocking device 1, the inner cylinder 1
1 is provided with a sliding piece 31 that can slide in the radial direction, and a crushable support piece 37 is provided on the outer cylinder 7 on the outer peripheral side of the sliding piece 31. By inserting a tool or the like into the key hole 13, the sliding piece 31 moves to the boundary portion 27 between the outer cylinder 7 and the inner cylinder 11, which causes the inner cylinder 11 to rotate with respect to the outer cylinder 7. Therefore, if an unauthorized unlocking operation is attempted by something other than the lock 51, the cylinder lock 3 becomes inoperable, that is, the locked state can be maintained and rendered unusable. The crime of unlocking can be prevented.

In the embodiment described above, the key 5 is
As the structure of No. 1, the small-diameter portion 57 is provided in a substantially midway portion of the insertion portion 55.
It may be formed at other positions together with the dimples 59 formed in the insertion portion 55, and various combinations such as the formation positions of the small diameter portion 57 and the dimples 59, the diameter of the small diameter portion 57, etc. It is possible to increase the key difference.

Further, the position of the sliding piece 31 having the engaging convex portion 33 arranged in the key hole 13 of the cylinder lock 3 is located at the back of the key hole 13 and corresponds to the engaging convex portion 33. Although the engaging concave portion 61 of the combined key insertion portion 55 is arranged at the tip of the insertion portion 55, the engaging convex portion 33 is arranged in the middle portion of the key hole 13 and the intermediate portion of the combined key insertion portion 55 is formed. For example, the engaging concave portion 61 may be provided in the portion, and the arrangement position thereof may be other positions.

[0043]

As described above, in the locking / unlocking device according to the present invention, the shape of the insertion portion of the compound key is a circular column shape and the shape of the key hole is a circular hole. Even if you try to lock a tool in the key hole to perform an unauthorized unlocking operation, it is not possible to rotate the inner cylinder because the shape does not hang in the rotation direction, so crime prevention is high. A locking / unlocking device can be obtained. In this locking / unlocking device, in order to rotate the inner cylinder of the cylinder lock with respect to the outer cylinder, a dowel key for moving each tumbler pin to a predetermined axial position is inserted into the key hole, and the shear line of each tumbler pin is inserted. Must be aligned with the boundary part, and in the key hole, the shape of the key hole and the outer shape of the insertion part of the dowel key must match, and the engaging concave portion and the engaging convex portion must be fitted together. Therefore, the duplicate key cannot be easily duplicated, which also makes it possible to obtain a locking / unlocking device having high crime prevention.

Further, as compared with the conventional flat plate-shaped compound key, since the shape of the insertion part of the compound key is columnar, the depth of the recess can be configured in multiple stages and the outer diameter of the insertion part can be made. Can be combined with a small-diameter portion or the like, so that it is possible to increase the number of different combinations.

Further, by making the engaging projection and the engaging recess elongated in the axial direction, the engaging state of the engaging projection and the engaging recess is such that the engagement in the circumferential direction is long. The rotation operation of the engagement key on the engagement recess side can be reliably transmitted to the inner cylinder on the engagement projection side, and the locking / unlocking operation of the inner cylinder by the engagement key can be performed.

In addition, a sliding piece that can slide in the inner cylinder in the radial direction is provided, and a crushable support piece is provided on the outer cylinder on the outer peripheral side of the sliding piece. Inserting a tool, etc., into the key hole causes the sliding piece to move to the boundary between the outer cylinder and the inner cylinder, which makes the inner cylinder unrotatable with respect to the outer cylinder. Cylinder lock becomes inoperable if an attempt is made to perform a proper unlocking operation with something other than a lock key, that is, the locked state can be maintained and rendered unusable, and the crime of unauthorized unlocking can be prevented beforehand. be able to.

Further, when the supporting piece is made of a thin circular pipe, the base end of the sliding piece located at the boundary between the inner cylinder and the outer cylinder and the supporting piece are not in close contact with each other. Therefore, during normal operation, the sliding piece and the support piece do not interfere with each other, and the inner cylinder can be rotated with respect to the outer cylinder without any trouble. Then, when the sliding piece moves backward, it is easily crushed, and it is possible to surely make a transition to the unlockable state against an unauthorized unlocking operation.

[Brief description of drawings]

FIG. 1 is a side sectional view showing an embodiment of a locking / unlocking device according to the present invention.

FIG. 2 is a side sectional view of a cylinder lock of the locking / unlocking device.

FIG. 3 is a front view of a cylinder lock of the locking / unlocking device.

FIG. 4 is a front sectional view of a cylinder lock of the locking / unlocking device.

FIG. 5 is a side view showing a joint key of the locking / unlocking device.

FIG. 6 is a front view showing a key of the locking / unlocking device.

FIG. 7 is a front sectional view showing an operating state of the locking / unlocking device.

FIG. 8 is a perspective view showing a joint key of a conventional locking / unlocking device.

FIG. 9 is a sectional view of the combined key.

FIG. 10 is a cross-sectional view showing a cylinder lock of a conventional locking / unlocking device.

FIG. 11 is a cross-sectional view showing a cylinder lock of a conventional locking / unlocking device.

[Explanation of symbols]

1 ... Locking / unlocking device 3 ... Cylinder lock 7 ... Outer cylinder 11 ... Inner cylinder 13 ... Key hole 17 ... Tumbler pin 25 ... Shearline 27 ... Border 29 ... Insertion hole 31 ... Sliding piece 33 ... Engaging projection 35 ... Space section 37 ... Support piece 51 ... Joint key 55 ... insertion part 57 ... Thin portion 59 ... Recess (dimple) 61 ... Engagement recess

Claims (5)

[Claims] 1. A cylinder lock having an outer cylinder and an inner cylinder rotatable with respect to the outer cylinder, wherein a tumbler pin is disposed so as to extend through the outer cylinder and the inner cylinder. By inserting a dowel key into the key hole, the tumbler pin is moved to a predetermined position in the radial direction from the key hole, and the shear line of the tumbler pin is aligned with the boundary between the outer cylinder and the inner cylinder. A locking / unlocking device for canceling the rotation restriction of the inner cylinder, wherein the inner cylinder has a key hole formed in a circular hole shape, and a cylindrical shape in which an insertion portion inserted into the key hole has a continuous circular cross section. And a fitting key formed on the outer peripheral surface of the insertion portion so as to correspond to the tumbler pin, and an engaging projection that is arranged at a predetermined position in the key hole of the inner cylinder and projects inwardly of the key hole. And an engaging protrusion formed on the outer peripheral surface of the joint key. Unlocking apparatus characterized by comprising engaging recess for engaging and. 2. The locking / unlocking device according to claim 1, wherein the insertion portion of the compound key is provided with a small diameter portion having a different outer diameter via a step portion in the axial direction. 3. The engaging convex portion is formed in a long ridge shape parallel to the axial direction of the inner cylinder, and the engaging concave portion is parallel to the axial direction of the inserting portion. The locking / unlocking device according to claim 1 or 2, wherein the locking / unlocking device is formed in a long groove. 4. An insertion hole is formed in the inner cylinder in the radial direction, and a sliding piece having a tip end serving as the engaging projection is provided in the insertion hole so as to be slidable in the radial direction of the inner cylinder. A space portion is formed on the inner peripheral surface of the outer cylinder so as to correspond to the insertion hole, and the engagement convex portion projects into the key hole by abutting the base end of the sliding piece in the space portion. Supported by
The locking / unlocking device according to claim 1, wherein a supporting piece that is crushed by sliding of the sliding piece is provided. 5. The locking / unlocking device according to claim 4, wherein the support piece is made of a thin circular pipe.