JP3856780B2 - Variable code cylinder lock - Google Patents

Description

The present invention relates to a variable code cylinder lock capable of changing a key code as required.

  In the case of a cylinder lock installed in a hotel guest room door, if the key is stolen or the guest of the guest room is inadvertently lost, there is a risk that the key will be unlocked without permission by a third party who has illegally obtained the key. There is a need to replace the cylinder lock.

However, when the entire lock is replaced, the economic burden on the lock installer is great, the labor of the replacement work is increased, and the room cannot be used safely until the lock replacement is completed.
As an improvement measure, there has been provided a variable code cylinder lock configured such that the key code can be changed as necessary and the original key cannot be used after the change (for example, Patent Document 1).

In the conventional variable code cylinder lock, a plurality of driver pin holes communicating with the inner peripheral surface are provided in a cylinder case in which a plug is rotatably inserted, and the driver pin and the driver pin are connected to the inner peripheral surface in the driver pin hole. A cord pin hole penetrating from the key hole of the plug to the outer peripheral surface of the plug is provided at a position corresponding to the driver pin hole, and at least one cord pin hole has a predetermined code pin. In addition to the cylinder lock in which a change pin facing the driver pin is inserted,
A plurality of first pin operating portions formed to a depth that makes the contact surface of the change pin and driver pin or the contact surface of the code pin and driver pin coincide with the outer peripheral surface of the plug when inserted into the keyhole. Service key and
It comprises a combination with a change key having at least one second pin operating portion formed to a depth that makes the contact surface of the code pin and the change pin coincide with the outer peripheral surface of the plug when inserted into the key hole. .

In this variable code cylinder lock, when the plug is rotated to the key change position, the change pin that has been fed into the driver pin hole is accommodated in a pocket portion formed on the outer peripheral surface of the plug. When the key code is changed, it becomes possible to use another service key that is different in the depth of the first pin operation section at the corresponding location, and the original service key cannot be used.

Although it is impossible in principle in a normal use form, there has been reported a case where the lock is unlocked by the original service key which has been disabled. As a result of analyzing this case, if the pitch interval of the key code setting is smaller than a certain value, the effect of component wear due to long-term use is added to the machining error of the component, and the plug and key vibrate. When inserted, the probability is low, but it was found that even the original service key was accidentally unlocked.

  This type of variable code cylinder lock requires a change key with a cross-section so as to mediate between the original service key before the key code change and the new service key after the key code change. The production cost of the system increased, and the management of the change key was complicated.

Registered Utility Model No. 2568653

The problem to be solved by the present invention is to improve so that the use of the change key is not necessary and the reuse of the original key, which has been disabled by changing the key code, can be surely eliminated.

The main feature of the present invention is that a cylinder case into which a plug is rotatably inserted is provided with a plurality of driver pin holes communicating with the inner peripheral surface, and the driver pins and the driver pins are disposed in the driver pin holes in the direction of the inner peripheral surface. A cord pin hole penetrating from the key hole of the plug to the outer peripheral surface of the plug is provided at a position corresponding to the driver pin hole, and at least one cord pin hole is provided with a predetermined code pin. Inserting a change pin facing the driver pin, and a cylinder lock having a pocket portion formed on the outer peripheral surface of the plug;
A first key having a first pin operating portion formed to a depth that makes the contact surface of the change pin and the driver pin or the contact surface of the code pin and the driver pin coincide with the outer peripheral surface of the plug when inserted into the key hole. When,
A combination with a second key having at least one second pin operating portion formed to a depth that makes the contact surface of the code pin and the change pin coincide with the outer peripheral surface of the plug when inserted into the key hole. Consists of
When the plug is rotated to the key change position by the second key, a communication hole penetrating the key hole is formed in the pocket portion in which the change pin fed from the driver pin hole is accommodated. The inner end of the resist pin inserted into the pocket is inserted into the communication hole, and the inner end of the resist pin protrudes into the key hole by accommodating the change pin in the pocket. In the second key, an escape portion through which the inner end portion of the resist pin can pass is formed in the second key.

In the variable code cylinder lock of the present invention, the pocket portion on the outer peripheral surface of the plug is formed so as to accommodate the resist pin together with the change pin, and the inner end portion of the resist pin is plugged from the communication hole at the bottom of the pocket portion. This resist pin is restrained so that it cannot move during the normal operation of locking / unlocking, so that the inner end portion does not form an escape portion through which the resist pin can pass. The first key cannot be inserted to the required depth as a result of being disturbed by the inner end.
Therefore, even if there is a machining error, parts wear, or the like, it is possible to reliably eliminate those who illegally use the original first key.

Also, since the key code is changed directly by the second key to be used next, there is no need for a change key as in the conventional method, the manufacturing cost of the entire set can be reduced, and complicated management of the change key is also possible. Save.

If a code pin and a change pin are inserted into only one or several specific code pin holes and only a code pin is inserted into the remaining code pin holes, the number of key codes that can be changed is naturally limited. It will be. In such an embodiment, the second key has a first pin operation unit in addition to the second pin operation unit.
Therefore, when it is desired to increase the number of key codes that can be changed to the maximum in response to a request for application of the cylinder lock, the code pins and change pins are inserted into all the code pin holes. In this case, the second key has only the second pin operation unit. Each component is made of a metal material having high mechanical strength.

  1 to 7 show a variable code cylinder lock according to a first embodiment of the present invention. FIG. 1 is a right side view of the entire cylinder lock. A cylindrical plug 2 is rotatably fitted in a cylindrical cylinder case 1, and a front end portion of the plug 2 is partially spherical on the front surface of the cylinder case 1. The rear end shaft portion of the plug 2 protrudes from the rear surface of the cylinder case 1. A state is shown in which the first key KA currently in use is inserted into the keyhole 3 of the plug 2 until halfway.

For example, when this cylinder lock is applied to a door (not shown) at the entrance / exit of a room, the cylinder case 1 is fitted in the door mounting hole, and is fastened and fixed to the door by a mounting nut fitted in the outer peripheral screw portion. Is done. A dead bolt is interlocked to the rear end shaft portion of the plug 2, and the dead bolt engages with a strike (not shown) provided on the side column of the doorway according to the rotation direction of the plug 2 during normal operation. The door is detached and the door is locked or unlocked with respect to the side pillar.

  In the first embodiment, a cord pin 5 and a change pin 6 are inserted into all of the cord pin holes 4 formed in the radial direction in parallel along the length direction of the plug 2. For convenience of explanation, the cross-sectional views of FIGS. 2 to 7 show pin arrangements at one specific location, but the same pin arrangement is used at the remaining locations. However, the lengths of the cord pins 5 are not common in the pin arrangement of each cross section, and in order to obtain many key differences, it is desirable that the lengths of the cord pins 5 be different from each other by a certain length dimension (pitch interval).

Correspondingly, the pin operation part (usually referred to as “key mountain”) formed by the concavo-convex part on the edge part or the abdominal part face of the side end face of the key is formed differently in the depth dimension. .
In the first embodiment, as shown in FIG. 1, the first pin operating portion 7 of the first key KA is constituted by an inverted frustoconical concave portion formed on one edge portion slope of the side end face of the plate-like key body. Has been. In the other second key KB, the first pin operation unit 7 and the second pin operation unit 8 are formed in the same manner. The length dimensions of the change pins 6 are all the same in each pin arrangement.
As described above, each pin operating portion is an inverted frustoconical concave portion, but in order to simplify the illustration and to facilitate comparison of the depth relationship, each pin operating portion is depicted as a simple flat surface. This flat surface corresponds to the bottom surface of the inverted frustoconical recess.

A spring 10 for moving and energizing the driver pin 9 in the direction of the plug 2 is constituted by a compression coil spring. One end of the spring 10 is inserted into a spring receiving recess 11 of the driver pin 9, and the other end of the spring 10 is a cylinder case. 1 is in contact with the spring receiving plate 12 that is fixed to 1.
The resist pin 13 is composed of a large-diameter head and a small-diameter inner end 15, and the depth of the pocket 14 is equal to the sum of the length of the change pin 6 and the length of the head of the resist pin 13. It has become. The inner end portion 15 of the resist pin 13 is set to a dimension such that a part of the inner end portion 15 protrudes into the key hole 3 when the head of the resist pin 13 comes into contact with the bottom surface of the pocket portion 14.

FIG. 2 shows a pin arrangement when the first key KA currently in use is pulled out from the key hole 3, and the driver pin 9 pushed by the spring 10 has an inner end at the driver pin hole 16. The plug 2 protrudes from the cord pin hole 4, thereby preventing the plug 2 from rotating relative to the cylinder case 1.
At this time, the dead bolt is engaged with the strike, and the door in the closed state is locked to the side column.

When the first key KA is inserted into the key hole 3 to a predetermined depth, the inner end portion of the cord pin 5 is pushed by the first pin operating portion 7 of the first key KA as shown in FIG. The change pin 6 moves in the centrifugal direction, the driver pin 9 is entirely immersed in the driver pin hole 16 against the bias of the spring 10, and the contact surface between the change pin 6 and the driver pin 9 is the outer periphery of the plug 2. Match the face.
Therefore, the rotation restriction of the plug 2 with respect to the cylinder case 1 is released. When the plug 2 is rotated by the first key KA in the normal operation direction shown in FIG. 3, that is, in the clockwise direction, the dead bolt is released from the strike at a predetermined angle, for example, 90 degrees, and the door is released. Locked.

  In the process of inserting the first key KA into the key hole 3, the tip cam surface portion of the first key KA contacts the inner end portion of the registration pin 13, but when the normal operation mode is set, the head of the registration pin 13 is set. Since there is a certain space between the inner portion of the cylinder case 1 and the inner peripheral surface of the cylinder case 1, the resist pin 13 whose inner end 15 is pressed by the first key KA Move in the direction and allow the first key KA to pass.

If the driver pin hole for escape is provided in the cylinder case 1 and the driver pin and the urging spring are inserted into the cylinder case 1, the first key KA can be removed from the plug 2 in the unlocked position. After the door has been opened and the person has entered and exited and the article has been carried in and out, when the door is closed and the first key KA is rotated in the reverse direction, the door is locked again and finally the first key KA is removed from the keyhole 3. .
Thus, the normal operation as a cylinder lock is no different from a general cylinder lock.

When the first key KA currently in use is stolen or the first key KA is lost, it is necessary to change the key code in order to ensure security. For the key code changing operation, the second key KB to be used next is directly used.
In the second key KB, the second pin operation unit 8 involved in the key code change is formed on an edge slope on the opposite side to the first pin operation unit 7.
Since the second pin operating portion 8 of the second key KB is formed shallower by the length of the change pin 6 than the first pin operating portion 7 of the original first key KA, the second key KB has a predetermined depth. When inserted into the keyhole 3 until then, the contact surface of the cord pin 5 and the change pin 6 coincides with the outer peripheral surface of the plug 2 as shown in FIG.

Thus, since the entire change pin 6 and driver pin 9 are immersed in the driver pin hole 16 against the bias of the spring 10, the rotation restriction of the plug 2 with respect to the cylinder case 1 is released.
Therefore, when the plug 2 is rotated by a predetermined angle (90 degrees in the first embodiment) by the second key KB in the direction opposite to that during normal operation, that is, in the counterclockwise direction in FIG. 4, as shown in FIG. The pin hole 16 faces the pocket portion 14. The change pin 6 is automatically fed from the driver pin 6 to the pocket portion 14 by the force of the spring 10 acting via the driver pin 9 at the moment when both faces are established.

The plug 2 having received the change pin 6 in the pocket portion 14 is returned to the initial insertion / removal position as shown in FIG. 6 by rotating the second key KB in the reverse direction.
The cord pin 5 and the driver pin 9 are moved in the centripetal direction by the biasing force of the spring 10 at the moment when the second key KB is extracted from the key hole 3.
As shown in FIG. 7, the driver pin 9 enters the cord pin hole 4 deeper than the original first key KA by the length of the change pin 6 moved to the pocket portion 14. The inner end protrudes into the key hole 3 longer by the length of the change pin 6.

The key code change is completed by the above operation, and the normal key is exchanged from the first key KA to the second key KB, but the cylinder lock body is not used, but is used as it is.
The second key KB is provided with a relief portion 17 through which the inner end portion 15 of the resist pin 13 can pass without resistance on the slope of the edge portion opposite to the first pin operation portion 7. KB can be inserted into the keyhole 3 without any problem.

On the other hand, when a person who has stolen or picked up the original first key KA tries to insert the first key KA into the key hole 3, the tip cam portion of the first key KA is the inner end portion of the check pin 13. Even if 15 is pushed back toward the communication hole 18, the change pin 6 is only pressed against the inner peripheral surface of the cylinder case 1 via the resist pin 13, so that the change pin 6 and the resist pin 13 are connected to the pocket portion 14. Movement within is completely constrained.
Therefore, the original first key KA is obstructed by the inner end 15 of the registration pin 13 and cannot be inserted into the key hole 3 to the required depth.

As a result, the reuse of the original first key KA is completely eliminated, and the risk of unauthorized opening and unlocking by the theft is eliminated.
In addition, the formation portion of the escape portion through which the inner end portion of the resist pin can pass is not limited to the edge portion of the side end surface of the plate-like key body, and can be formed on the abdomen surface of the key body. The number and shape of the parts and the arrangement angle are not particularly limited. In the accompanying drawings, the change pin is drawn relatively long for easy understanding, but it is actually a thinner disk.

It is a right view of the variable code | cord cylinder lock which concerns on Example 1 of this invention, and has shown the state which inserted the 1st key currently in use to the halfway. FIG. 2 is a cross-sectional view of the cylinder lock of FIG. 1 at a specific location, with the first key being removed. FIG. 5 is a cross-sectional view at the specific one position, showing a state in which the first key is inserted to a predetermined depth and the plug is rotatable. FIG. 4 is a cross-sectional view at one specific location, showing a state in which a second key to be used next is inserted to a predetermined depth and the plug is rotatable, and the change pin is inserted from the cord pin hole of the plug into the driver of the cylinder case. It is fed into the pin hole. FIG. 6 is a cross-sectional view of the one specific position, showing a state in which the plug is rotated to the cord changing position by the second key and the change pin is received from the driver pin hole into the pocket portion. It is a transverse cross section in the above-mentioned one specific place, and shows the state where the plug was returned to the insertion and removal position with the 2nd key. It is a transverse cross section in the above-mentioned specific one place, and shows the state where the 2nd key was extracted from the plug.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cylinder case 2 Plug 3 Key hole 4 Code pin hole 5 Code pin 6 Change pin 7 1st pin operation part 8 2nd pin operation part 9 Driver pin 10 Spring 11 Circular recess 12 Spring support plate 13 Resist pin 14 Pocket part 15 Resist Inner end of pin 16 Driver pin hole 17 Escape part 18 Communication hole KA 1st key KB 2nd key

Claims (1)

A cylinder case with a plug inserted rotatably is provided with a plurality of driver pin holes communicating with the inner peripheral surface, and a driver pin and a spring for urging the driver pin toward the inner peripheral surface are inserted into the driver pin hole. A cord pin hole penetrating from the key hole of the plug to the outer peripheral surface of the plug is provided at a position corresponding to the driver pin hole, and at least one cord pin hole faces the driver pin in addition to a predetermined cord pin. Insert a change pin, a cylinder lock formed with a pocket portion on the outer peripheral surface of the plug,
A first key having a first pin operating portion formed to a depth that makes the contact surface of the change pin and the driver pin or the contact surface of the code pin and the driver pin coincide with the outer peripheral surface of the plug when inserted into the key hole. When,
A combination with a second key having at least one second pin operating portion formed to a depth that makes the contact surface of the code pin and the change pin coincide with the outer peripheral surface of the plug when inserted into the key hole. Consists of
When the plug is rotated to the key change position by the second key, a communication hole penetrating the key hole is formed in the pocket portion in which the change pin fed from the driver pin hole is accommodated. The inner end of the resist pin inserted into the pocket is inserted into the communication hole, and the inner end of the resist pin protrudes into the key hole by accommodating the change pin in the pocket. A variable code cylinder lock in which the second key is formed with an escape portion through which the inner end of the resist pin can pass.

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