JP4916751B2 - Cylinder lock device - Google Patents

Description

The present invention relates to a cylinder lock device .

As a cylinder lock capable of changing the unlocking code, one described in Patent Document 1 is known. In this conventional example, the cylinder lock has a holding rod (code changing body) interposed between the tumbler in the plug and the drive pin on the cylinder case side, and this holding rod is formed on the outer peripheral wall of the plug. The unlocking code can be changed by moving it to the receiving groove (changed body storage recess).
Japanese Patent No. 3101678

  This type of cylinder lock is different from the unlock key used in the state where the cord change body is held in the plug and the unlock key used in the state where the code change body is moved into the change body storage recess. In addition, there is a case where an operation of giving an unlock key corresponding to the state of the cylinder lock to different lock operators is performed.

  For example, when a new house is built, an unlocking key corresponding to the cylinder lock before the code change is given to the construction contractor so that the user can freely enter and exit the room, and the code is changed after the work is completed. Unlocking with the unlocking key possessed by the contractor can be made impossible without replacement.

  However, in the above-described conventional example, the unlocking key before and after the code change has a difference corresponding to the thickness dimension of the code changing body in the depth of the code forming recess for operating the corresponding tumbler. For example, it is not possible to completely prevent the operation of the cylinder lock after changing the code by reducing the depth of the code forming recess of the unlocking key set for a construction company.

The present invention has been made in order to eliminate the above drawbacks, and a cylinder using a code variable cylinder lock having improved security performance by making it impossible to provide compatibility of the unlocking key before and after the code change. To provide a locking device.

According to the present invention, the object is
A plug 5 holding a pin-shaped tumbler 4 that can be moved forward and backward in the key insertion recess 2 is inserted into the cylinder case 6, and is inserted into a driver receiving hole 6a opened in the cylinder case 6, and is plugged by a compression spring 14a. A cylinder lock 10 that urges the tumbler 4 in a direction to protrude into the key insertion recess 2 by a drive pin 14 that is biased to the side,
An unlocking key 1 inserted into the key insertion recess 2;
The cord changing body 7 stacked on the tumbler 4 and held in the plug 5 is moved to the changing body storage recess 8 formed in the rotational boundary 1b between the plug 5 and the cylinder case 6 to change the unlocking code. A cylinder locking device,
The tumbler 4 is formed in such a length that the other end is located in the tumbler accommodation hole 3 when one end is located on the open wall surface of the tumbler accommodation hole 3 of the key insertion recess 2.
The unlocking key forming recess 1a is formed in the unlocking key 1 used before changing the unlocking code, and the tumbler 4 is moved to a position in the plug 5 that is uniquely determined by the unlocking code forming recess 1a. The boundary between the cord change body 7 and the drive pin 14 is made to coincide with the rotation boundary 1b between the plug 5 and the cylinder case 6,
The cylinder lock 10 is disposed opposite to the tumbler 4 and is urged toward the center of the plug 3 by a compression spring 14a having a larger spring force than the compression spring 14a urging the tumbler 4. 12 and
The unlocking key 1 to be used after changing the unlocking code is mounted in the mounting hole 11 opened in the front and back direction of the unlocking key 1 so as to be able to pass through the key insertion recess 2, and the second tumbler the tumbler driver 9 extrudable pushed 12 the tumbler 4 in the cylinder case 6 side, the boundary between the tumblers 4 and drive pin 14 coincides with the rotation boundary 1b between the plug 5 and the cylinder casing 6 position This is achieved by providing a cylinder lock device that is movably held on the tumbler 4 side beyond the tumbler housing hole 3 open wall.
Similarly,
A plug 5 holding a pin-shaped tumbler 4 that can be moved forward and backward in the key insertion recess 2 is inserted into the cylinder case 6, and is inserted into a driver receiving hole 6a opened in the cylinder case 6, and is plugged by a compression spring 14a. A cylinder lock 10 that urges the tumbler 4 in a direction to protrude into the key insertion recess 2 by a drive pin 14 that is biased to the side,
An unlocking key 1 inserted into the key insertion recess 2;
The cord changing body 7 stacked on the tumbler 4 and held in the plug 5 is moved to the changing body storage recess 8 formed in the rotational boundary 1b between the plug 5 and the cylinder case 6 to change the unlocking code. A cylinder locking device,
The tumbler 4 is formed in such a length that the other end is located in the tumbler accommodation hole 3 when one end is located on the open wall surface of the tumbler accommodation hole 3 of the key insertion recess 2.
The unlocking key forming recess 1a is formed in the unlocking key 1 used before changing the unlocking code, and the tumbler 4 is moved to a position in the plug 5 that is uniquely determined by the unlocking code forming recess 1a. While making the boundary between the cord change body 7 and the drive pin 14 coincide with the rotation boundary 1b between the plug 5 and the cylinder case 6,
The unlocking key 1 used after the unlocking code is changed is biased in the pushing direction of the tumbler 4 by the compression spring 13 having a spring force larger than that of the compression spring 14a for biasing the tumbler 4. can pass through the key insertion recess 2 by being movably accommodated in the mounting hole 11, and the tumbler driver 9 extrudable said tumbler 4 in the cylinder case 6 side, the tumblers 4 and drive This is achieved by providing a cylinder locking device that is held movably on the tumbler 4 side beyond the open wall surface of the tumbler housing hole 3 until the boundary with the pin 14 coincides with the rotational boundary 1b between the plug 5 and the cylinder case 6. The
The above-described code variable cylinder lock 10 is
A plug 5 containing a pin-shaped tumbler 4 is inserted into a cylinder case 6 in a tumbler receiving hole 3 opened in a key insertion recess 2 for inserting the unlocking key 1, and is laminated on the tumbler 4. The cord changing body 7 held by the plug 5 is moved to the changing body storing recessed portion 8 recessed at the rotational boundary between the plug 5 and the cylinder case 6 to change the unlocking code,
The tumbler 4 is formed in such a length that the other end is located in the tumbler accommodation hole 3 when one end is located on the open wall surface of the tumbler accommodation hole 3 of the key insertion recess 2.
After the code change, one end is positioned at the rotation boundary of the cylinder case 6 by the tumbler driving body 9 which is incorporated in the unlocking key 1 and can pass through the key insertion recess 2 and is movable in the moving direction of the tumbler 4. It can be configured to be driven to the unlocked position.

  The cord variable cylinder lock 10 is formed by inserting a plug 5 holding an appropriate number of tumblers 4 into a cylinder case 6. When the unlocking key 1 is inserted into the key insertion recess 2 of the plug 5, the tumbler 4 moves to a position in the plug 5 that is uniquely determined by the unlocking code forming recess 1 a formed in the unlocking key 1. When the unlocking cord forming recess 1a is adapted to the cylinder lock 10, one end of the tumbler 4 is positioned on the rotation boundary 1b with the cylinder case 6, and thereafter the rotation operation to the plug 5 is allowed.

  In a state where the cord changing body 7 is stacked on the tumbler 4 and held in the plug 5, the plug 5 can rotate when either one of the upper and lower ends of the cord changing body 7 is positioned at the rotation boundary 1 b with the cylinder case 6. When the cord changing body 7 is moved from the stacking position on the tumbler 4 to the changing body storing concave portion 8 from this state, the plug 5 is subsequently moved when one end of the tumbler 4 is positioned at the rotation boundary 1b with the cylinder case 6. Only be rotatable.

  The modified body storage recess 8 can be formed on the inner periphery of the cylinder case 6 in addition to being formed on the outer periphery of the plug 5 as will be described later in the embodiment. In this case, the cylinder lock 10 is newly provided with a position where the unlocking key can be inserted / removed at the position where the cord change body 7 and the change body storage recess 8 are directly facing each other, and the code change body 7 moves to the change body storage recess 8 Once the plug 5 is rotated to the position where the unlocking key can be inserted / removed, the unlocking key 1 is exchanged at that position, the code changer 7 is pushed into the changer storage recess 8, and the initial locking rotation is performed. This can be done by returning it to the position.

  On the other hand, since the tumbler 4 is formed in such a length that the other end is located in the tumbler accommodation hole 3 when one end is located on the open wall surface of the tumbler accommodation hole 3 of the key insertion recess 2, After moving to the change body storage recess 8, even if the unlocking key 1 having a cross-sectional shape that matches the cross-sectional shape of the key insertion recess 2 is inserted, one end is positioned at the rotation boundary 1 b between the plug 5 and the cylinder case 6. I can't let you. In order to allow the plug 5 to rotate by positioning one end of the tumbler 4 at the rotation boundary 1b, it is necessary to enter the tumbler housing hole 3 beyond the wall surface of the key insertion recess 2 and push out the tumbler 4. Since the unlock key 1 cannot be inserted into the key insertion recess 2 in the first place, the cylinder lock 10 after the code change is operated only by filling the code formation recess of the unlock key 1 that can be used before the change. I can't.

  On the other hand, the unlocking key 1 used for the cylinder lock 10 incorporates a tumbler driving body 9 that can pass through the key insertion recess 2 and is movable in the moving direction of the tumbler 4. When the unlocking key 1 is inserted, the tumbler driving body 9 moves to a position facing the tumbler 4, and then when it is moved into the tumbler housing hole 3 by appropriate means, one end of the tumbler 4 is positioned at the rotation boundary 1b. The plug 5 can be rotated.

  The driving of the tumbler driving body 9 can be performed by using the second tumbler 12 incorporated in the cylinder lock 10 or using an urging means such as a compression spring 13 incorporated in the tumbler driving body 9. The second tumbler 12 is housed in the second tumbler housing hole 3 opened to the wall surface facing the wall surface on the side where the tumbler housing hole 3 of the key insertion recess 2 is opened, and protrudes into the key insertion recess 2. Be energized. As shown in the embodiment, the second tumbler 12 is biased by a drive pin 14 arranged in the cylinder case 6 or in the second tumbler housing hole 3 formed in the bottom. It may be a compression spring housed in the housing.

  Further, when the tumbler driving body 9 is urged in the pushing direction of the tumbler 4 and incorporated in the unlocking key 1, a driving force can be applied to the tumbler 4 without the presence of the second tumbler 12.

  Furthermore, the present invention in which the boundary between the tumbler 4 and the tumbler driver 9 is set in the tumbler housing hole 3 after the code change has the following advantages. That is, the code change is performed by adjusting the effective length of the tumbler 4 by the code change body 7, and as shown in the conventional example, the operation before and after the code change is performed by the unlocking key 1 that does not have the tumbler drive body 9. In this case, the difference in the effective length of the tumbler 4, that is, the thickness of the cord changing body 7 is limited to the plate thickness of the unlocking key 1, and a large dimension cannot be taken.

  On the other hand, in the present invention in which the boundary between the tumbler 4 and the tumbler driving body 9 enters the tumbler housing hole 3 and is unlocked after changing the cord, the effective length difference of the tumbler 4 can be increased. . As a result, for example, it is possible to configure a so-called grand master key system by arranging a plurality of code change bodies 7 within this effective length difference, or to change a plurality of types of codes.

  According to the present invention, it is possible to improve the crime prevention performance by making it impossible to provide compatibility of the unlock key before and after the code change.

  1 and 2 show an embodiment of the present invention configured as a cylinder lock used for a front door lock of a house. The entrance lock includes a cylinder lock 10 in which a plug 5 is inserted into a cylinder case 6 and a locking device such as a box lock (not shown). The cylinder case 6 is provided with a cover 16 that is biased toward the front side of the entrance door by a spring 15 so as to cover a mounting hole opened in the entrance door, and is connected to a locking device at the rear end of the plug 5. The connected connector 17 is fixed.

  The plug 5 includes a guide protrusion 2a corresponding to a guide groove 1c, which will be described later, in the longitudinal direction, and a key insertion recess 2 into which the general cross-section of the unlocking key 1 can be inserted. One end of the key insertion recess 2 is opened. The tumblers 4 are arranged in the longitudinal direction of the plug 5 at an appropriate pitch in the tumbler housing holes 3.

  As shown in FIG. 2 (b), the unlocking key 1 is formed by a plate-like member having a substantially rectangular general cross section having two guide grooves 1c on a wide surface, and is provided at one end for operation not shown. A head is formed. Further, an unlocking code forming recess 1 a is formed at a portion corresponding to the plug 5 when inserted into the key insertion recess 2. The unlocking key 1 is formed in a point-symmetric cross-sectional shape so that it can be inserted into the key insertion recess 2 in an upside down posture.

  The cylinder housing 6 that holds the plug 5 is provided with a driver accommodation hole 6a, and a drive pin 14 is attached thereto. As shown in FIGS. 1 and 2, the drive pin 14 faces each tumbler 4 attached to the plug 5 when the plug 5 is in the initial rotation position. The drive pin 14 is urged toward the plug 5 by a compression spring 14a, and the tumbler 4 is urged in a direction in which one end protrudes into the key insertion recess 2 at the initial rotation position.

  As shown in FIGS. 1 and 2, when the unlock key 1 is not inserted, the drive pin 14 enters the rotation boundary 1b between the plug 5 and the cylinder case 6, and the rotation of the plug 5 with respect to the cylinder case 6 is prohibited. It becomes locked. When the unlocking key 1 is inserted from this state, as shown in FIG. 3, one end of the tumbler 4 moves to a position determined by the depth of the unlocking cord forming recess 1a, and the inserted unlocking key 1 is authentic. If so, the boundary between the plug 5 and the drive pin 14 coincides with the rotation boundary 1b of the plug 5, and the plug 5 can be rotated (unlocked state).

  As described above, the cylinder lock 10 includes a code variable portion that can change the unlocking code in addition to the general portion in which the unlocking code is previously determined as one type by the combination of the tumbler 4 and the drive pin 14. .

  In this embodiment, the cord variable portion is disposed at the tail end of the plug 5, and moves in and out of the key insertion recess 2 from the wide surface of the key insertion recess 2, and the second is disposed opposite to the tumbler 4. A tumbler 12 and a disk-shaped cord changing body 7 are provided. The tumbler 4 and the second tumbler 12 are urged toward the center of the plug 5 by a drive pin 14 on the cylinder case 6 side, and the spring force of the compression spring 14 a that urges the second tumbler 12 urges the tumbler 4. It is set larger than that of the compression spring 14a.

  The cord change body 7 is disposed at the boundary between the tumbler 4 and the drive pin 14 and the second tumbler 12 and the drive pin 14, and the cord change body storage recess into which the cord change body 7 can be fitted on the outer periphery of the plug 5. 8 is formed. The change body storage recess 8 is provided at a position facing the drive pin 14 when the plug 5 is rotated by a predetermined angle (45 ° in this embodiment), and is fitted as shown in FIG. The cord changing body 7 is formed to a depth that does not protrude from the outer periphery of the plug 5.

  The operation of the cylinder lock 10 configured as described above will be described by taking as an example a case where it is used as a front door lock of a newly built house. First, as shown in FIGS. 1 and 2, the tumbler 4, the second tumbler 12, and the cord changing body 7 are configured so that the drive pin 14 is not connected to the plug 5 in the state where the unlock key 1 is not inserted into the plug 5. The rotation boundary 1b of the plug 5 is blocked, and the rotation of the plug 5 is restricted.

  On the other hand, the unlocking key 1 shown in FIG. When the primary key is inserted into the plug 5, the boundary between the tumbler 4 of the general part and the drive pin 14 coincides with the rotational boundary 1b of the plug 5, and the code variable body 7 An unlocking cord forming recess 1a whose boundary with the drive pin 14 coincides with the rotation boundary 1b of the plug 5 is provided, and a construction person can freely perform the unlocking and unlocking operation using the primary key. it can.

  When the construction by the primary key user is completed and the house is handed over, the unlocking key 1 shown in FIG. 4 is handed over to the landlord as the final key. The final key has the same general portion as the primary key, and a tumbler driver 9 is incorporated in the code variable portion in place of the unlocking cord forming recess 1a.

  As shown in FIG. 4B, the tumbler driving body 9 includes a bottom piece 9a provided with a guide protrusion 9b and a head piece provided with a guide recess 9c into which the guide protrusion 9b is slidably inserted. It is formed by laminating pieces 9d and is urged in the separation direction by a compression spring 9e. The tumbler driving body 9 is formed at a height that allows the key piece recessed portion 2 of the plug 5 to pass through in a state where the head piece 9d and the bottom piece 9a are in contact with each other.

  The mounting hole 11 on the side of the unlocking key 1 that accommodates the tumbler driving body 9 penetrates in the thickness direction of the unlocking key 1, and the open end corresponding to the head piece 9d is reduced in diameter, The open end on the side corresponding to the bottom piece 9a is caulked to prevent the tumbler drive body 9 from falling off. In a state where the tumbler driving body 9 is accommodated in the mounting hole 11, the head piece 9 d and the bottom piece 9 a are pressed against the open end periphery of the mounting hole 11 by the urging force of the compression spring 9 e, and enter the mounting hole 11. Prevent intrusion of dust.

  When the unlocking key 1 configured as described above is inserted into the plug 5, the bottom piece 9a corresponds to the second tumbler 12 and the head piece 9d corresponds to the tumbler 4 as shown in FIG. . As described above, the spring force of the compression spring 14a that biases the second tumbler 12 is greater than the spring force of the compression spring 14a on the tumbler 4 side (more precisely, the spring force of the compression spring 14a on the tumbler 4 side and the tumbler drive). The tumbler drive body 9 is mounted with the head piece 9d in a state where the bottom piece 9a and the head piece 9d are in contact with each other. It is pushed up until it is pressed against the reduced diameter end of the hole 11.

  In this state, the tumbler 4 and the second tumbler 12 are set to have a length located at the rotation boundary 1b between the cylinder case 6 and the plug 5, so that the plug 5 can be rotated by inserting the final key. it can. When the plug 5 is rotated, the cord changing body 7 is left in the driver receiving hole 6a, and when the plug 5 is rotated to a position where the cord changing body 7 faces the changing body storing recess 8 as shown in FIG. The code change body 7 is pushed out by the drive pin 14 and falls into the change body storage recess 8.

  When the plug 5 is rotated again to the initial position from this state, each cord change body 7 is left in the corresponding change body storage recess 8 as shown in FIG. When the final key is removed in this state, the drive pin 14 enters the tumbler housing hole 3 of the plug 5 to close the rotation boundary 1b of the plug 5 and enters a locked state.

  Further, even if the primary key is inserted in this state, the rotation boundary 1b of the plug 5 is blocked by the drive pin 14 as shown in FIG. 5B, and the locked state cannot be released. Further, as shown in FIG. 4A, the tumbler driving body 9 of the final key pushes one end of the tumbler 4 upward by δ from the contour of the unlocking key 1, more precisely from the surface of the guide groove 1c. The other end is positioned at the rotation boundary 1 b of the plug 5. For this reason, in order to position the tumbler 4 at the normal position by modifying the unlocking cord forming recess 1a of the primary key shown in FIG. 5 (b), the meat exceeding the general cross-sectional shape of the unlocking key 1 is used. In this case, the unlocking key 1 cannot be inserted into the key insertion recess 2, and as a result, the unauthorized unlocking operation of the cylinder lock 10 using the primary key is completely blocked. The

  Further, in this embodiment, a secondary key using the code changing body 7 stacked on the second tumbler 12 is set. As shown in FIG. 6, the unlocking code forming recess 1a of the secondary key changes the boundary between the cord changing body 7 and the drive pin 14 on the tumbler 4 side and the second tumbler 12 on the second tumbler 12 side. It is formed to such a depth that the tumbler 4 and the second tumbler 12 are moved until the boundary with the body 7 is positioned at the rotation boundary 1 b of the plug 5.

  When the plug 5 is rotated from this state, the cord changer 7 on the second tumbler 12 side falls into the corresponding changer storage recess 8. After that, when the secondary key is removed again after returning to the initial position, the drive pin 14 enters the plug 5 and is locked as shown in FIG. Even if the primary key that has been used from this locked state is inserted, the drive pin 14 on the second tumbler 12 side closes the rotation boundary 1b of the plug 5 as shown in FIG. 7B. The plug 5 cannot be rotated.

  Further, when the final key is inserted in a state where it can be unlocked by the secondary key, the cord changer 7 on the tumbler 4 side that remains in the plug 5 is pushed out to the driver accommodation hole 6a side. Thereafter, when the plug 5 is rotated, the code change body 7 is also moved into the change body storage recess 8 as shown in FIG.

  Even if the secondary key is inserted after the code is changed, the rotation boundary 1b of the plug 5 is closed by the drive pin 14 on the tumbler 4 side as shown in FIG. Thereafter, the unlocking operation can be performed only with the last key.

  In the above, the case where the tumbler driving body 9 is formed by connecting the head piece 9d and the bottom piece 9a as a whole so as to be extendable and contractible has been shown. Etc. can also be formed.

  FIG. 8 shows another embodiment of the present invention. In the description of this embodiment, components that are substantially the same as those of the above-described embodiment are denoted by the same reference numerals in the drawing, and description thereof is omitted.

  In this embodiment, the second tumbler 12 that is essential in the above-described embodiment is eliminated, and the tumbler driving body 9 is movably accommodated in the mounting hole 11 whose bottom is closed by the bottom plate 1d. The tumbler driver 9 is urged toward the tumbler 4 by a compression spring 13 interposed between the tumbler driver 9 and the bottom plate 1d. The spring force of the compression spring 13 accommodated in the mounting hole 11 is set larger than the spring force of the compression spring 14 that urges the drive pin 14 on the tumbler 4 side. The tumbler 4 is pushed up to a position where the tumbler driving body 9 contacts the reduced diameter portion of the mounting hole 11 as shown in FIGS.

  Therefore, in this embodiment, the cord is changed by rotating the plug 5 from the state shown in FIGS. 8A and 8B and moving the cord changing body 7 stacked on the tumbler 4 to the changing portion storing recess 8. Action is taken.

  In this embodiment, the tumbler 4 used as the second tumbler 12 in the above embodiment is used as the third tumbler 18 for setting the secondary key. As shown in FIG. 3A, when the primary key is inserted in the third tumbler 18 in a state where the code change bodies 7 are stacked, the boundary between the code change body 7 and the drive pins 14 is plug 5. The length coincides with the rotation boundary 1b, and unlocking operation using the primary key is allowed.

  On the other hand, as shown in FIG. 6, the secondary key has an unlocking cord forming recess 1a in which the boundary between the third tumbler 18 and the cord changing body 7 coincides with the rotation boundary 1b of the plug 5. When the plug 5 is rotated using this secondary key, the unlocking operation using the primary key becomes impossible as described above.

  Next, when the plug 5 is rotated using the final key, the code change body 7 on the third tumbler 18 side moves to the change body storage recess 8 as shown in FIG. The unlocking key 1 that can be used is limited to the last key.

It is sectional drawing which shows this invention. It is a figure which shows a cylinder lock apparatus, (a) is the sectional view on the 2A-2A line of FIG. 1, (b) is sectional drawing of the general sectional part of an unlocking key, (c) is sectional drawing which shows an unlocking code formation recessed part It is. It is a figure which shows the state which inserted the primary key, (a) is a figure corresponding to FIG. 2 (a), (b) is a figure corresponding to FIG. FIGS. 2A and 2B are diagrams illustrating a state where a final key is inserted, in which FIG. 2A corresponds to FIG. 2A illustrating an initial rotation position, FIG. 2B is a cross-sectional view illustrating a tumbler driving body, and FIG. FIG. It is a figure which shows the code change completion state, (a) is a figure which shows the state which extracted the unlocking key, (b) is a figure which shows the state which inserted the primary key. It is a figure which shows the state which inserted the secondary key, (a) is a figure corresponding to FIG. 2 (a), (b) is a figure corresponding to FIG. The figure which shows completion of code change, (a) is a figure which shows the state which extracted the unlocking key after the code change with the secondary key, (b) is the primary key inserted after the code change with the secondary key The figure which shows a state, (c) is a figure which shows the state which inserted the secondary key after the code change with the last key. 4A and 4B are diagrams showing another embodiment of the present invention, in which FIG. 2A is a diagram corresponding to FIG. 2A, FIG. 2B is a diagram corresponding to FIG. 1, and FIG. is there.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Unlocking key 2 Key insertion recessed part 3 Tumbler accommodation hole 4 Tumbler 5 Plug 6 Cylinder case 7 Code change body 8 Changed body storing recessed part 9 Tumbler drive body 10 Cylinder lock 11 Mounting hole 12 2nd tumbler 13 Compression spring

Claims (3)

A drive pin that inserts a plug holding a pin-shaped tumbler into the key insertion recess into the cylinder case, is installed in a driver accommodation hole established in the cylinder case, and is urged toward the plug by a compression spring A cylinder lock that urges the tumbler in the direction of popping out into the key insertion recess,
An unlocking key inserted into the key insertion recess,
A cylinder locking device for changing an unlocking code by moving a cord changing body stacked on the tumbler and held in a plug to a changing body storing recess recessed at a rotation boundary between the plug and the cylinder case,
The tumbler is formed in such a length that the other end is located in the tumbler accommodation hole when one end is located on the tumbler accommodation hole opening wall surface of the key insertion recess,
The unlocking key forming recess is formed in the unlocking key used before the unlocking code is changed, and the code changer and the drive are moved by moving the tumbler to a position in the plug uniquely determined by the unlocking code forming recess. Match the pin boundary with the rotation boundary between the plug and cylinder case,
And the cylinder lock is disposed opposite to the tumbler, and has a second tumbler that is urged toward the center of the plug by a compression spring having a larger spring force than the compression spring that urges the tumbler.
The unlocking key to be used after changing the unlocking code is mounted in a mounting hole opened in the front and back direction of the unlocking key, can pass through the key insertion recess, and is pushed up by the second tumbler. movably said tumbler to tumbler driver extrudable the cylinder case side, the boundary between the tumbler and the drive pin exceeds the tumbler accommodating hole open wall to a position that coincides with the rotation boundary between the plug and the cylinder casing to the tumbler side Cylinder lock device held in A drive pin that inserts a plug holding a pin-shaped tumbler into the key insertion recess into the cylinder case, is installed in a driver accommodation hole established in the cylinder case, and is urged toward the plug by a compression spring A cylinder lock that urges the tumbler in the direction of popping out into the key insertion recess,
An unlocking key inserted into the key insertion recess,
A cylinder locking device for changing an unlocking code by moving a cord changing body stacked on the tumbler and held in a plug to a changing body storing recess recessed at a rotation boundary between the plug and the cylinder case,
The tumbler is formed in such a length that the other end is located in the tumbler accommodation hole when one end is located on the tumbler accommodation hole opening wall surface of the key insertion recess,
The unlocking key forming recess is formed in the unlocking key used before the unlocking code is changed, and the code changer and the drive are moved by moving the tumbler to a position in the plug uniquely determined by the unlocking code forming recess. While making the boundary with the pin coincide with the rotation boundary between the plug and the cylinder case,
The unlocking key used after changing the unlocking code is biased in the pushing direction of the tumbler by a compression spring having a larger spring force than the compression spring that biases the tumbler, and moves into the bottomed mounting hole. a freely by being capable of accommodating through said key insertion recess, and the rotation of said tumbler driver extrudable the cylinder case side tumblers, the tumblers and drive pins with the boundary plug and cylinder case A cylinder locking device that is movably held on the tumbler side beyond the tumbler accommodation hole open wall surface to a position that coincides with the boundary. The code change body is stacked on the second tumbler so as to be stored in a change body storage recess,
The cylinder lock device according to claim 1, wherein the unlocking code can be changed by changing the position of the code changing body.

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