JPH0252749B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a cylinder lock, and more particularly to a cylinder lock suitable for a door of a room or the like that is used by an unspecified number of people. In the case of locks, such as the entrances and exits of each room in a hotel, which are used by an unspecified number of people and where the user is often left with the responsibility of keeping the key to the door, it is easy for the lock to be lost, and a master key must be prepared. is necessary,
Moreover, the scope of responsibility for security management tends to be unclear, and in addition, when keys are duplicated due to malicious use, it is often necessary to replace the entire key with a new one. First, a conventional cylinder lock will be explained.
FIG. 1 is a front view showing the appearance of a typical cylinder lock. In the figure, the cylinder lock consists of a cylinder part A and a mounting part B. The mounting part B is attached so as to sandwich a door plate etc. from both the front and back sides, and the cylindrical cylinder part A is inserted into the mounting part B. . The cylinder part A is composed of an outer cylinder 1 and an inner cylinder 2. The outer cylinder 1 is fixed to the mounting part B, and the inner cylinder 2 has a keyway 20 carved in the axial direction of the cylinder so that it can be secured inside the door. is engaged with a latch portion (not shown). The cylinder lock itself is locked and unlocked when the latch portion moves into the locked or unlocked state in conjunction with the rotation of the inner cylinder 2. The rotation of the inner cylinder 2 is caused by the rotation of the outer cylinder 1.
The boundary between the pins placed in the pin holes that communicate with the
This is possible by inserting the key and aligning it with the boundary between the inner and outer cylinders. FIGS. 2A and 2B are sectional views illustrating the relationship between the above-mentioned key and pin state. In the figure, the pin holes 11a, 12a, 13a of the outer cylinder 1 and the pin holes 21a, 22a, 23a of the inner cylinder 2 are aligned in the direction of the keyway, and the lock is in the rotation position where the lock is in the locked state. Assuming that there is an inner cylinder 2, the pin holes 11a and 21a, 12a and 22a, 13 of the inner and outer cylinders are
a and 23a are in communication. These pin holes have outer cylinder pins 16a, 17a,
18a are respectively fitted, and the inner cylinder pins 26a, 27a, 28a are in contact with the outer cylinder pin and are pressed toward the inner cylinder side by the spring 10 disposed at the bottom of the pin hole on the outer cylinder side. has been done. Here, when the key 3 is inserted into the key groove, the key 3 is inserted into the inner cylinder pins 26a, 2
It is inserted while pushing 7a and 28a back toward the outer cylinder. The inner cylindrical pins 26a, 27a and 28a each have unique dimensions in the longitudinal direction of the cylinder, and the pin configuration of each dimension provides identification of the lock corresponding to the shape of the key. In this conventional example, the inner cylinder pin 26a is shorter than the inner cylinder pin 27a, and the inner cylinder pin 27a and the inner cylinder pin 28a have the same length, so that the pin of the key 3 is pushed back as shown in FIG. If the pin configuration corresponds to "low", "low", and "high" from the tip side, the boundary between each pin will match the boundary between the inner and outer cylinders, making the inner cylinder 2 rotatable. , if the shape of the crest of the key 3' does not correspond to the pin configuration, as shown in Figure B, for example, the inner cylinder pin 26a
The outer cylinder pin 16a bites into the inner cylinder side without reaching the outer circumference of the inner cylinder 2, and conversely, the inner cylinder pin 28a is pushed back too far into the key crest and bites into the outer cylinder side. It is locked to the cylinder 1 with a pin and cannot be rotated, making it impossible to unlock it. In this way, if there is only one type of key for one lock, security concerns arise every time the key is lost or copied by a malicious user. Moreover, the scope of their responsibility is unclear, and in many cases the entire lock must be replaced with a new one. Additionally, in order to deal with this problem, conventional methods have been devised to create a double lock system in which two cylinder locks are installed in one mounting part and each lock is unlocked using a different key, but this naturally increases the size of the device and locks the door. In the past, renovations were costly and troublesome. Therefore, two types of keys are always required to unlock the door.
A cylinder lock was developed in which when Party A owned one key and Party B owned the other key, the lock could only be operated in the presence of Party A and Party B (see Japanese Patent Publication No. 42-21170). This cylinder lock is provided with two or more rows of grooves on the outer casing around the inner cylinder, and any one of the grooves in each row has a large diameter, and a large diameter screwdriver is inserted into it. The same number of keys as the groove rows are prepared, and each key is provided with a recess into which the pin can be inserted deeper than specified, at a location corresponding to a large diameter groove in the corresponding groove row. After unlocking with the second key, when locking with the second key, the second key is pressed at the relay position between the first key and the second key.
Since the key can be pulled out, there is a drawback that the lock may be incomplete depending on the position where the key is pulled out. The present invention eliminates the drawbacks of the above-mentioned prior art and provides the first
To provide a cylinder lock which makes it impossible to pull out the second key at a relay position between the key and the second key. In order to achieve the above object, the present invention consists of an inner cylinder and an outer cylinder, and pins are connected to pin holes of the inner and outer cylinders aligned in the direction of the key groove of the inner cylinder, respectively, and the pins are connected to the key groove. By inserting the key, the boundary between the pins communicating with the pin holes of the inner and outer cylinders is aligned with the boundary between the inner and outer cylinders, and the inner cylinder is made rotatable, and the lock is in the first rotational position where the lock is in the locked state and the lock is in the locked state. A cylinder lock that locks and unlocks the lock by rotating between a second rotational position, which is an unlocking position, and includes two different types of keys that can be inserted into one cylinder lock, and a first and second rotational position.
A third rotational position, which is a key relay point, is set between the rotational position of and the second and third rotational positions, and the first
and a second key, and a pin hole in an arbitrary groove row of the outer cylinder at the first rotational position and the first rotation of the outer cylinder at the second and third rotational positions. Each pin hole in a groove row different from that at the moving position is made larger in diameter, and a ball with a larger diameter is loaded into each pin hole.
The inner cylindrical pins corresponding to the large-diameter balls at the first, second, and third rotational positions are made shorter and shorter, while the pin holes at the third rotational position, which is the key relay point, are made shorter and smaller. A pin hole is provided in the outer cylinder at the rotational position on the axially symmetric side, and a key locking pin is loaded into the pin hole so as to be pressed against the outer peripheral wall of the inner cylinder, and the first,
A notch is provided on the opposite side of the blade of the second two keys to receive the key locking pin,
The notch formed in the first key is configured to form a cylinder lock with a gentle slope on the tip side. Hereinafter, the present invention will be explained in detail with reference to the accompanying drawings. FIGS. 3A, 3B, and 3C are schematic front views illustrating the rotation of the inner cylinder of the cylinder lock according to the present invention. In the figure, the cylinder portion consists of an outer cylinder 1 and an inner cylinder 2, and the inner cylinder 2 has a keyway 20 carved therein. Figure A shows a case where the inner cylinder 2 is in the first rotation position a where the lock is in the locked state,
is in an upright position. Figure B shows a case where the inner cylinder 2 is in the second rotational position b where the lock is in the unlocked state, and the keyway 20 is rotated 320 degrees clockwise from the upright position.
It is in a rotated position. Figure C shows a case where the inner cylinder 2 is at the third rotational position C set as a relay point, and the keyway 20 is in a position rotated 40 degrees clockwise from the upright position. . Note that these rotation angles are determined by the material of the cylinder part and the stroke of the latch part engaged with the inner tube, and the above is just an example. Next, the structure of the pins arranged in the outer cylinder will be explained in correspondence with each rotational position. Fourth
The figure is a sectional view showing an example of a cylinder section in which the present invention is implemented. In the figure, the cylinder portion consists of an outer cylinder 1 and an inner cylinder 2, and the inner cylinder 2 having a keyway 20 is rotatably fitted inside the outer cylinder 1. However, when actually inserting and rotating the key, the pin configuration and key shape (described later) are compared.
The lock by the pin must be released. Now, the outer cylinder 1 has pin holes 11a, 12a...15a, 11b, 12b aligned in the axial direction at radial positions a, b, and c corresponding to the respective rotational positions.
...15b, 11c, 12c...15c (see FIG. 6) are provided with pin positions in the axial direction aligned circumferentially. FIG. 4 shows the first pin holes 11a, 11b, and 11c as an example, and the inner cylinder 2 is in the first rotation position in the locked state, and the pin hole 11a on the outer cylinder side and the inner cylinder side pin hole 2
1a are in communication with each other. With the key not inserted, the outer cylinder pin 16a is urged by the spring 10 to push the inner cylinder 26a into the hole bottom, and is also halfway inserted into the pin hole 21a on the inner cylinder side, rotating the inner cylinder 2. It is immovably locked. The outer cylinder pins 16b and 1 are in two other rotational positions that do not correspond to the inner cylinder pin.
6c is similarly pressed against the outer circumferential wall of the inner cylinder 2 by spring force. Further, at a radial position c of the outer cylinder 1 corresponding to the third rotational position which is a relay point position, a key locking pin is provided on the axially symmetrical side of the circumference with respect to the pin hole 11c and the outer cylinder pin 16c. 36c is pin hole 3
It is disposed inside 1c and is pressed against the inner cylinder 2 by spring force. Note that the pin position of this key locking pin 36c may be moved slightly along the keyway. FIG. 5 is a side view showing an example of the pair key according to the present invention. The first key 3A and the second key 3B shown in the figure are provided corresponding to the cylinder part, and the part inserted into the key groove has the shape of the cross section perpendicular to the cylinder axis. Corresponding to the cross section of the keyway, both keys are identical.
The difference between the two keys is the shape of a "mountain" provided on the blade of the key along the direction of the keyway in order to push back the inner cylinder pin, which corresponds to the inner cylinder pin closest to the grip side. The “mountain” (position indicated by line 11) is
The first key 3A is at a "high" level, but the second key 3B is at a "low" level, with a "mountain" (line 15) corresponding to the inner cylinder pin closest to the tip.
) is set to "low" for the first key 3A.
However, the second key 3B is set to the "high" level. The middle three pin positions (line 1
2, 13 or 14) “Mountain”
is ``slightly high'' or ``slightly low'', which is common to the two keys. Of course, there is no problem in forming either position to be "high" or "low", and the configuration becomes the distinguishing property that is compared with each cylinder lock. The two keys are provided with a notch 30A or 30B on the butt part on the opposite side of the key blade to receive the key locking pin, and the notch 30A of the first key has a gently sloped end. It's getting old,
When pulling out the key, the pin head of the key locking pin can be slipped, but the notch 30 of the second key
B is notched at an acute angle and is deeply engaged with the key locking pin, so that the second key 3B cannot be removed at the third rotational position, which is the relay point. FIG. 6 is a sectional view illustrating the state of the key and pin configuration at each rotational position according to the present invention. In the figure, the cylinder part is an outer cylinder 1 and an inner cylinder 2.
and a first key 3A in the keyway of the inner cylinder 2.
Alternatively, a state in which the second key 3B is inserted is shown. Among the five pin positions along the direction of the keyway, for the middle three pin positions (positions indicated by lines 12, 13, and 14), the "mountain" level of the two keys is the same as described above. The pin configuration of the inner and outer cylinders is the same at all rotational positions and corresponds to the above level, and the boundary between the pins coincides with the boundary between the inner and outer cylinders and does not affect the rotation of the inner cylinder 2. . In this embodiment, the inner cylinder pin is provided in four types with different length dimensions, and the "mountain" of each key is "high", "slightly high", "slightly low", or "low".
The design is such that the border between the pins and the inner and outer cylinders coincides with the border between the inner and outer cylinders. In this embodiment, the pin holes of the inner cylinder 2 at the pin positions at both ends (positions indicated by lines 11 or 15) are loaded with pins that should correspond to "high", that is, the shortest and smallest pins. Now, FIGS. 6-A and 6-B show the case where the inner cylinder 2 is in the first rotational position where the lock is in the locked state. The pin configuration of the outer cylinder 1 corresponding to this rotational position is that the pin hole 11a is a normal pin hole and a normal outer cylinder pin 16a is loaded, but the pin hole 11a is a normal pin hole and a normal outer cylinder pin 16a is loaded.
The hole a has a larger diameter than usual, and instead of a pin, a ball with a diameter that cannot enter the pin hole of the inner cylinder is loaded. Figure A shows the state in which the first key 3A is inserted in the above state. Pin hole 21a of inner cylinder
Since the "mountain" of the key 3A corresponding to is "high", the inner cylinder pin 26a is pushed back sufficiently, and the outer cylinder pin 16
The boundary with a corresponds to the boundary between the inner and outer cylinders. pin hole 2
Since the "mountain" of the key 3A corresponding to 5a is "low", the short and small inner cylinder pin 30a does not reach the boundary, and normally the outer cylinder pin would enter the inner cylinder side and lock the inner cylinder. , as described above, the pin hole 15 on the outer cylinder side
Since the large-sized ball 20a is loaded in the ball 20a, it cannot enter the inner cylinder side, and therefore the first key 3A can rotate in all five pin holes. Figure B shows the second key 3B inserted in the same state, and since the "mountain" of this key 3B is "high" with respect to the pin hole 25a, the inner cylinder pin 30
The outer end of the inner cylinder pin 26a is now in contact with the ball 20a, but since it is "lower" than the pin hole 21a, the outer end of the inner cylinder pin 26a does not reach the boundary between the inner and outer cylinders and enters the outer cylinder pin 16a. Then, the inner cylinder 2 is locked.
That is, the second key 3B cannot rotate the inner cylinder at the first rotation position. Figure 6-
A and -B show the case where the inner cylinder 2 is at the third rotational position set as a relay point. The pin configuration of the outer cylinder 1 corresponding to this rotational position is opposite to the first rotational position, in which a ball 16C is loaded into the pin hole 11C, and a normal outer cylinder pin 20C is loaded into the pin hole 15C. . Therefore, as shown in Figure A, the first key 3A cannot rotate the inner cylinder 2, and as shown in Figure B, the second key 3B can rotate the inner cylinder 2. Make it. In addition, in this rotational position, as mentioned above, in addition to the normal outer cylinder pin, the key locking pin 36C is provided on the outer cylinder 1, and is similarly biased by a spring and locks into the notch of the key 3A. 30A or the notch 30B of the key 3B, but as shown in Figure A, the tip of the notch 30A of the key 3A has a gentle slope, so use this gentle slope to insert the pin head of the locking pin 36C. While holding down, press key 3A.
However, as shown in Figure B, both sides of the notch 30B of the key 3B are at right angles and are locked to the locking pin 36C, making it impossible to move in the direction of the keyway. , the second key cannot be removed in this position. Figure 6-A
and -B shows the case where the inner cylinder 2 is in the second rotational position where the lock is in the unlocked state, and the bottle configuration of the outer cylinder 1 corresponding to this rotational position is such that the key locking pin is The structure of the outer cylinder pin in the third rotational position is exactly the same, and the function is also the same, except that the first key 3A is not connected to the inner cylinder 2, as shown in Figure A. I couldn't turn it, so...
As shown in B, the second key 3B enables the inner cylinder 2 to rotate. Note that the second key 3B can be freely inserted and removed at this rotational position. That is, in this embodiment, depending on the key shape and pin configuration, the two keys have the functions shown in the table below at three rotational positions.

[Table] And the cylinder lock with the above functions is
It is operated as follows. When unlocking, first move the first lock at the first rotation position.
Insert the key and rotate the inner cylinder clockwise. Even if the second key is inserted in this rotation position, it will not rotate. When the first key is used to rotate the inner cylinder to the third rotational position, the first key cannot be rotated at that position, so it is removed. Instead, the second key is inserted and the rotation is continued until the inner cylinder reaches the second rotational position, and the lock is unlocked by the latch part that engages with the inner cylinder. . When locking, only the second key can rotate the inner cylinder at the second rotational position, so the second key is inserted and the inner cylinder is rotated counterclockwise. The rotation passes through the third rotation position on the way, but the second key cannot be removed at that position, even if
Even if the second key can be removed, the first key cannot be rotated in any direction from the third rotational position, so the second key can be used to move the inner cylinder to the first rotational position.
Rotate the latch to the rotation position to complete locking. To summarize, unlocking is done by the first key from the first rotation position to the relay point, and the second key is used from the relay point to the second rotation position, and locking is done by the second key. Just use the keys. The first key cannot rotate in the second and third rotational positions and therefore cannot participate in locking. If the second key comes out at the third rotational position, both locking and unlocking are incomplete as described above. Then, in the first rotation position, the lock state is reached;
Since it is clear that the lock is in the unlocked state at the second rotational position, it is possible to confirm whether the lock is locked or unlocked by looking at the cylinder part where the key is removed, based on the angle of the keyway. There are various ways to use the above cylinder lock, but when using it as a room key, the customer
One possible method is to carry the first key with you at all times and leave the second key with the hotel each time you go out, or if you use it as a safe deposit box lock, the first key is kept by the manager and the second key is left with you every time you unlock it. One possible method would be for the customer to be present and hold the second key, which is used to unlock and lock the second stage. In any case, since two keys are required to unlock the lock, it is impossible to unlock the lock even if you obtain only one key, making it difficult for fraud to occur and being extremely effective from a security standpoint. Furthermore, since the first key is responsible for the first stage of unlocking, and the second key is responsible for the second stage of unlocking and locking, the scope of responsibility is also clear. As explained above, according to the present invention, the second
Since the key cannot be removed at the third rotation position,
To provide an excellent cylinder lock that has superior security, is difficult to commit fraud, has a clear scope of management responsibility, and can be modified by simply replacing the cylinder head of an ordinary lock, as is clear from the structure.

[Brief explanation of drawings]

Figure 1 is a front view of a general example of a cylinder lock, Figure 2 is a front view of a general example of a cylinder lock.
3 is a schematic front view of the inner cylinder of the present invention, FIG. 4 is a sectional view showing an example of the cylinder part according to the present invention, and FIG. 5 is a sectional view of the relationship between a conventional key and a pin. A side view of the key, FIG. 6 is a sectional view illustrating the key and pin configuration according to the present invention at each rotational position. A... Cylinder part, 1... Outer cylinder, 2... Inner cylinder, 3, 3A, 3B... Key, 10... Spring, 1
1a to 15c...Outer cylinder pin hole, 16a to 20c...
...Outer cylinder pin or ball, 20...Keyway, 2
1a to 25c...Inner cylinder pin hole, 26a to 30c...
...Inner cylinder pin or pole, 30A, 30B...
Notch, 31C... Locking pin hole, 36C... Locking pin, a... First rotation position, b... Second rotation position, c... Third rotation position.

Claims (1)

[Claims] 1 Consisting of an inner cylinder and an outer cylinder, pins are connected to pin holes of the inner and outer cylinders aligned in the direction of key grooves of the inner cylinder, and the pin holes of the inner and outer cylinders are connected by inserting a key into the key groove. The boundary between the pins connected to the inner and outer cylinders is aligned with the boundary between the inner and outer cylinders to enable rotation of the inner cylinder.
A cylinder lock that locks and unlocks by rotating between a first rotational position where the lock is locked and a second rotational position where the lock is unlocked, and which can be inserted into one cylinder lock. In addition to having keys of two different shapes, a third rotation position, which is a key relay point, is set between the first rotation position and the second rotation position, and communicates with the pin hole of the inner and outer cylinders. The structure of the pin is made different between the first rotational position and the second and third rotational positions, and the first key and the second key are made to correspond to each other. A pin hole in an arbitrary groove row of the outer cylinder at the position and a pin hole in a groove row different from that in the first rotation position of the outer cylinder at the second and third rotational positions are each made to have a large diameter. A large-diameter ball is loaded into the inner cylinder pin, which corresponds to the large-diameter ball at the first rotation position, second rotation position, and third rotation position. A pin hole is provided in the outer cylinder at the rotation position on the axially symmetrical side to the pin hole at the rotation position 3, and a key locking pin is loaded into the pin hole so as to be pressed against the outer peripheral wall of the inner cylinder,
A notch for receiving the key locking pin is provided in the first and second keys on the opposite side from the blade, and the notch formed in the first key has a gently sloped tip. A cylinder lock characterized by: