JP3416361B2 - Variable code type cylinder lock - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a variable code type cylinder lock capable of changing a key code of a cylinder lock.

[0002]

2. Description of the Related Art A door is locked and unlocked by a simple operation of inserting a key into a keyhole of a cylinder lock fixed to a door and rotating the door. It is convenient because it can be prevented from being unlocked, and it is used in a wide range of fields including doors for vending machines and doors for rockers. However, if there is a risk of losing the key or creating a duplicate key, it is necessary to replace the cylinder lock with a different code.

It is expensive to prepare a large number of cylinder locks having different codes, and there is a problem that the work of replacing the cylinder locks is troublesome and time-consuming. In such a case, therefore, the variable code whose key code can be easily changed. It is better to use a type cylinder lock. The variable code type cylinder lock includes the technology described in Japanese Patent Laid-Open No. 3-234275. This variable code type cylinder lock A will be briefly described with reference to FIG.
As shown in the longitudinal sectional view of FIG.
The cylindrical portion 2a of the intermediate ring 2 is rotatably inserted in
The tongue 3 is attached to the shaft portion 2b extending to the rear end (right end in FIG. 14) of the tubular portion 2a, and the plug 4 is rotatably inserted into the tubular portion 2a.

The case 1 is provided with a plurality of rows of driver pin holes 5 arranged in the axial direction of the case 1 on the upper side, and a row of push pin holes 6 on the lower side of the case 1. To
A cover 7 is provided to cover the driver pin hole 5 and the push pin hole 6. A spring 8 and a driver pin 9 are inserted into each driver pin hole 5, a reset pin hole 10 is provided at the rear of the row of driver pin holes 5, a reset pin 11 is inserted into the reset pin hole 10, and each push pin is inserted. In the hole 6, the spring 1
2 and the push pin 13 are inserted.

The intermediate ring 2 has an intermediate pin hole 14 corresponding to each driver pin hole 5 at the locking angle shown in FIG.
And a variable cord pin hole 15 that matches each push pin hole 6
And an intermediate reset pin hole 16 that matches the reset pin hole 10 is provided. An intermediate pin 17 is provided in each intermediate pin hole 14.
The variable code pin 18 is inserted into each variable code pin hole 15, and the intermediate reset pin 19 is inserted into the intermediate reset pin hole 16.

The thickness of the intermediate pin 17 is substantially equal to the length of the intermediate pin hole 14, and the total thickness of the three variable cord pins stacked is approximately equal to the length of the intermediate pin hole 14. The variable code pins 18 have a number (three) that fills at least the variable code pin holes 15, and a larger number of variable code pins 18 are used for key code conversion. It is housed in 6.

The plug 4 is provided with a key hole 20 which is open to the front surface. When the plug 4 is at the locking angle shown in FIG. 14, a tumbler pin hole 21 penetrating the outer peripheral surface of the plug 4 from the key hole 20 is an intermediate pin. Hole 22 with a bottom and a matching hole 14
Corresponds to the intermediate reset pin hole 16. A tumbler pin 23 is inserted into the tumbler pin hole 21, and a hole 22 with a bottom is provided.
The auxiliary reset pin 24 is inserted in the.

In FIG. 14, the tumbler pin hole 21 at the right end is shown.
One variable code pin 18 is inserted into each of the tumbler pin holes 21, and zero, two, and one variable code pin 18 are inserted into each tumbler pin hole 21 toward the left side. In the variable cord type cylinder lock A configured as described above, the first shear line L ₁ is formed on the outer peripheral surface of the intermediate ring 2, and the second shear line L ₂ is formed on the outer peripheral surface of the plug 4. . When inserting a key at the time of initial setting with key codes corresponding to 1, 0, 2 and 1 from the tip toward the rear,
Both end surfaces of the intermediate pin 17 coincide with the first shear line L ₁ and the second shear line L ₂ . On the other hand, reset pin 1
Since the contact surface between 1 and the intermediate reset pin 19 is aligned with the first shear line L ₁ and the auxiliary reset pin 24 is in the position to engage with the second shear line L ₂ , the plug 4 and the intermediate ring are operated by key operation. 2 rotate together, almost 9
The tongue 3 is unlocked at the unlocked position rotated by 0 degree.

In order to convert the key code, the reset pin 11 is pushed in so that the contact surfaces of the intermediate reset pin 19 and the auxiliary reset pin 24 coincide with the second shear line L ₂ (at this time, the reset pin 11 is in the first position). Shearline L
Engage ₁ ). Therefore, only the plug 4 can be rotated, and when the key is rotated by about 180 degrees, the tumbler pin hole 21 is aligned with the variable code pin hole 15.

Next, the key at the time of initial setting is removed, and the second key K having a key code of zero, two, one, and zero is inserted from the tip, and converted into a key code suitable for the second key K. (See FIG. 15). Next, when the second key K is rotated 180 degrees and pulled out, the key code conversion operation is completed.
You can convert it to the key code of the key at the time of initial setting again,
It is also possible to convert to a third key code.

[0011]

The variable code type cylinder lock A as described above has the following problems.
For example, if the key code conversion is performed without noticing that the second key K is shallowly inserted by one pitch of the tumbler pin hole 21, zero, two, one, and the key code that should be zero from the tip is the tip. More raw code, zero, two
Since the key code is converted into a single key code and a code different from the second key K, there is a possibility that the second key K cannot be used. The present invention is intended to solve such problems.

[0012]

In order to achieve the above object, a variable cord type cylinder lock of the present invention is formed in a tubular shape, and driver pin holes and push pin holes are respectively arranged in the axial direction, and a rear portion is provided. A case having a joint pin hole on its side, an intermediate pin hole that is rotatably inserted in the case and that matches the driver pin hole, a variable code pin hole that matches the push pin hole, and the joint pin hole. An intermediate ring having matching openings, a key hole that is rotatably inserted in the intermediate ring and opens on the front surface, a tumbler pin hole that matches the intermediate pin hole through the key hole, and a hole that communicates with the opening. , a plug and tumbler accommodating chamber communicating with the pores are provided, and a driver pin which is biased in a direction engaged into the intermediate pin holes are inserted in the driver pin hole, said intermediate pin hole of the same length An intermediate pin to be inserted into the intermediate pin hole, a tumbler pin to be inserted into the tumbler pin hole, a variable code pin having a number that fills at least the variable code pin hole, and the variable pin to be inserted into the push pin hole. The push pin that is biased in the direction that pushes the cord pin, and the push pin that is housed in the tumbler housing chamber, is biased in the direction that projects outward, and is biased in the opposite direction by the key.
And a complete insertion confirmation tumbler that allows the protrusion to enter the hole of the plug, and a separable upper and lower parts, which are inserted into the joint pin hole and are urged toward the complete insertion confirmation tumbler. In the hole above the plug
Enter the full insertion confirmation tumbler to the protruding portion
A joint pin that presses the joint pin, and the upper and lower connecting surfaces of the joint pin and the outer peripheral surface of the intermediate ring when pushed by the fully inserted key through the complete insertion confirmation tumbler. It is characterized in that the joint pin is provided with an operation portion that is moved to a position where the lower end surface of the joint pin coincides with the outer peripheral surface of the plug.

The operating portion of the joint pin is a reset pin inserted in the case in parallel with the axial direction of the case. A recess having an inclined surface is formed in the upper portion of the joint pin, and the key is a key. When the reset pin is completely inserted into the hole, the reset pin is brought into contact with the inclined surface to move the joint pin. Alternatively, the operating portion of the joint pin comprises a manual operating lever integrally formed on the upper portion of the joint pin.

The upper and lower connecting surfaces of the joint pin are formed into curved surfaces substantially similar to the outer peripheral surface of the intermediate ring.
It is preferable that the engaging projection provided on one end surface engages with the engaging recess provided on the other end surface in a disengageable manner.
An engaging protrusion is formed at an end of the complete insertion confirmation tumbler, and the engaging protrusion can be engaged with an opening of the intermediate ring or an engaging recess formed at a position facing the opening. .

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a variable code type cylinder lock A ₁
2 is a vertical sectional view showing a locked state in which the key is not inserted, and FIG. 2 is a U-U sectional view of FIG. As shown in FIG. 1, an annular peripheral wall 31 projecting toward the inner peripheral surface is provided at the front part (the left end part in FIG. 1) of a case 30 formed in a tubular shape, and a mounting flange 32 is provided at the rear part of the case 30. The mounting holes 33 are provided at two positions above and below the mounting flange 32.

A plurality (eight in this embodiment) of driver pin holes 34 are arranged in the axial direction of the case 30 on the upper side of the case 30, and the same number as the driver pin holes 34 are provided on the lower side of the case 30. The push pin holes 35 are arranged in the axial direction of the case 30. A joint pin hole 36 is provided behind the driver pin hole 34, and a reset pin hole 37 that communicates with the joint pin hole 36 from the rear surface of the case 30 is provided. A portion of the reset pin hole 37 connected to the joint pin hole 36 is formed in the small hole 37a. Case 30
A row of driver pin holes 34, push pin holes 3
Grooves 38 intersecting each other are engraved in the row of 5, and a cover 39 is attached to the grooves 38.

The intermediate ring 40 has a cylindrical portion 40a rotatably inserted into the inner peripheral surface of the case 30, and a shaft portion 40b extending to the rear end of the cylindrical portion 40a. A tongue (not shown) for locking and unlocking is attached to 40b. At the locking position shown in FIG. 1, the tubular portion 40a has an intermediate pin hole 41 which corresponds to each driver pin hole 34, a variable code pin hole 42 which corresponds to each push pin hole 35, and a joint pin hole 36. A matching opening 43 (see FIG. 2) is provided.

The opening 43 is provided with notches 43a, on both sides of which the hole having the same diameter as that of the joint pin hole 36, can be engaged with an engaging projection 61 described later (see FIG. 2). An annular groove 44 that intersects the opening 43 is provided on the outer peripheral surface of the tubular portion 40a (see FIGS. 1 and 2). An engagement recess 45 is provided on the inner peripheral surface of the tubular portion 40a on the side opposite to the opening 43.

The plug 46 inserted in the tubular portion 40a is
A key hole 47 opening to the front, a tumbler pin hole 48 communicating with the plug 46 from the key hole 47 and coinciding with the intermediate pin hole 41 at the locking position shown in FIG. . The tumbler accommodating chamber 49 is provided with a hole 50 (see FIGS. 1 and 2) having the same diameter as the joint pin hole 36, and an opening 51 (see FIG. 1) is provided on the opposite side of the circular hole 50.

The spring 52 and the driver pin 53 are inserted into the respective driver pin holes 34 of the case 30, and the driver pin 5
3 is urged in a direction to engage with the intermediate pin hole 41 of the intermediate ring 40. A spring 54 and a push pin 55 are inserted in each push pin hole 35, and a plurality of (two in FIG. 1) variable code pins 56 are inserted in the initial stage in this embodiment. Therefore, the push pin 55 is biased in the direction of pushing the variable cord pin 56.

In each intermediate pin hole 41 of the intermediate ring 40,
An intermediate pin 57 having a length substantially equal to that of the intermediate pin hole 41 is inserted. A plurality of (three in this embodiment) variable code pins 56 are inserted into each variable code pin hole 42 of the intermediate ring 40, and the total thickness of the stacked variable code pins 56 is the variable code pin hole 42. Is almost equal to the length of.

A tumbler pin 58 is inserted into each tumbler pin hole 48 of the plug 46, and a plate-like complete insertion confirmation tumbler 59 is inserted into the tumbler accommodating chamber 49 (see FIG. 2). Full insertion confirmation tumblers 59, the key insertion hole 60 is provided substantially at the center, the end portion detachably engaging projection 61 is provided on the engaging recess 45 and the opening 43 of the intermediate ring 40, the engaging projection 61 Is provided on the side opposite to
Then , the engagement protrusion 61 is urged in a direction to engage with the engagement recess 45 and the opening 43 by the spring 62 inserted between the tumbler storage chamber 49 and the complete insertion confirmation tumbler 59.

The spring 63 and the upper portion 64a of the joint pin 64 are inserted into the joint pin hole 36 of the case 30. The joint pin 64 includes an upper portion 64a and an upper portion 64a.
And a detachable lower part 64b, and a lower part 64b.
Are inserted into the openings 43 of the intermediate ring 40 and the circular holes 50 of the plug 46. The upper and lower connecting surfaces of the joint pin 64 are formed into a curved surface substantially similar to the outer peripheral surface of the intermediate ring 40, and the engaging projections 65 provided on the end surfaces of the upper portion 64a and the dovetail groove-shaped engaging portions provided on the lower portion 64b. It engages with the recess 66.

A reset pin 68, which is an operating portion of the joint pin 64, and a spring 67 are inserted into the reset pin hole 37 of the case 30. When the reset pin 68 is pushed in against the spring 67, the tip of the reset pin 68 projects into the joint pin hole 36 via the small hole 37a. The upper portion 64a of the joint pin 64 is provided with a concave portion 69 whose upper inner wall is formed in an inclined surface which becomes higher toward the outside. The position of the recess 69 is lower than the tip of the reset pin 68 when the key is not inserted.

Next, the operation of the variable cord type cylinder lock A ₁ constructed as described above will be described with reference to FIGS.
A description will be given in the order of locked state with no key inserted, key insertion at the time of initial setting, locking and unlocking operation, and key code conversion operation. In the locked state where the key is not inserted, as shown in FIGS. 1 and 2, the driver pin 53 pushed by the spring 52 causes the intermediate ring 40 to move.
The first shear line L ₁ that is the outer peripheral surface of the plug 46 and the intermediate pin 57 that is pushed by the driver pin 53 engages the second shear line L ₂ that is the outer peripheral surface of the plug 46.
The tip of the tumbler pin 58 pushed by 7 projects into the key hole 47. Further, the engagement protrusion 61 of the complete insertion confirmation tumbler 59 is engaged with the engagement recess 45 of the intermediate ring 40.
Therefore, neither the plug 46 nor the intermediate ring 40 can rotate.

In such a locked state, when the key K ₁ at the time of initial setting is completely inserted into the key hole 47, the tumbler pin 58 pushed by the key K ₁ pushes the intermediate pin 57, and both end faces of the intermediate pin 57 are pushed. Correspond to the first shear line L ₁ and the second shear line L ₂ (see FIG. 3).

On the other hand, the tip end of the fully inserted key K ₁ pushes the key insertion hole 60 of the complete insertion confirmation tumbler 59, so that the complete insertion confirmation tumbler 59 moves upward by a predetermined amount in the opposite direction to the urging protrusion. 61 is the engaging recess 4 of the intermediate ring 40.
5, the lower part 64 of the joint pin 64
Push up b (see Fig. 4), upper part 6 of joint pin 64
The connecting surface between 4a and the lower portion 64b coincides with the first shear line L ₁ . Further, since the lower portion 64b engages with the second shear line L ₂ , the intermediate ring 40 and the plug 46 can rotate integrally. Therefore, the complete insertion confirmation tumbler 59
Has the function of confirming the complete insertion of the key and becoming one key code.

When the key K ₁ is completely inserted, as shown in FIG. 3, the recess 69 of the joint pin 64 is raised by a predetermined amount.
The sloping surface of the upper part of the is raised to the position where the reset pin 68 can be pushed. When the key K ₁ is rotated approximately 90 degrees to the unlocked position, the lower portion 6 of the joint pin 64, which is disengaged from the upper portion 64a, together with the plug 46 and the intermediate ring 40, is released.
4b rotate integrally (see FIG. 5), and the intermediate ring 4
Tongue (not shown) attached to 0 shaft portion 40b
Moves to the unlocked position and is unlocked. At this time, the engagement protrusion 65 of the upper portion 64a passes through the annular groove 44. When the key K ₁ is pivoted back to the original locking position and the key K ₁ is pulled out, the state shown in FIGS. 1 and 2 is restored.

Next, the key code conversion will be described. From the state where the key K ₁ at the time of initial setting is completely inserted into the key hole 47 of the variable code type cylinder lock A ₁ (see FIGS. 3 and 4), the reset pin 68 is started. Push in (see FIG. 6). By this operation, the upper portion 64a of the joint pin 64, which is pushed by the inclined surface of the recess 69 by the reset pin 68, rises together with the lower portion 64b, the lower portion 46b of the joint pin 64 engages with the first shear line L ₁ , and the lower portion The lower end surface of 64b coincides with the second shear line L ₂ (see FIGS. 6 and 7).

When the key K ₁ is completely inserted, the engagement protrusion 61 of the complete insertion confirmation tumbler 59 is disengaged from the engagement recess 45 of the intermediate ring 40. Therefore, since the reset pin 68 cannot be pushed in when the key K ₁ is not inserted, the joint pin 64 cannot be moved. Only when the key K ₁ is completely inserted and the reset pin 68 is operated, only the plug 46 can be rotated.

Next, when the key K _{1 is used} to rotate only the plug 46 by approximately 180 degrees so that the tumbler pin hole 48 and the variable code pin hole 42 are aligned (see FIG. 8), the variable code pin in the variable code pin hole 42. 56 overlaps with the tumbler pin 58. Since the joint pin 64 cannot be engaged with the opening 51 of the tumbler accommodating chamber 49, it remains in contact with the outer peripheral surface of the plug 46 (see FIGS. 8 and 9). Therefore, it does not matter if the reset pin 68 is released.

Next, when the key K ₁ is pulled out, the engagement protrusion 61 of the tumbler 59 for confirming complete insertion is cut by the spring 62 into the cutout portion 4.
Since it is engaged with 3a, the plug 46 does not rotate. When the second key K ₂ is completely inserted, the tip of the second key K ₂ pushes the key insertion hole 60, and the complete insertion confirmation tumbler 5
9 moves in the direction opposite to the biasing force, the engagement between the engagement protrusion 61 and the notch 43a is released, and the variable code pin 56 is moved according to the position of the tumbler pin 58 pressed by the second key K ₂ . The position fluctuates (see FIG. 10), and each tumbler pin hole 48 moves toward the variable cord pin 5 from the rightmost end toward the left.
6 is two, one, two, zero, one, two, one, one
Individual pieces are inserted and converted into the code of the second key K ₂ . Next, the second key K ₂ is pivotally operated to return to the original locking position (see FIGS. 11 and 12), and the second key K ₂ is pulled out to complete the key code conversion operation.

When the second key K2 is not completely inserted but is inserted shallowly by one pitch of the tumbler pin hole 48, there is a risk that the key code will be different from the second key K2, but the second key K2 If is not completely inserted, the complete insertion confirmation tumbler 59 does not move in the direction opposite to the biasing direction, so that the engaging projection 61 engages with the opening 43 of the intermediate ring 40 and blocks the rotation of the plug 46. Therefore, there is no risk of code conversion in the incompletely inserted state of the key, which is a major feature of the present invention. The lower 64 b of the joint pin 64 is so engaged with the first shear line L1, the rotation operation of the second key K2 is quite impossible.

FIG. 13 shows a second embodiment of the operating portion of the joint pin 64. Instead of the reset pin 68,
The manual operation lever 70 is provided on the upper portion 64a of the joint pin 64.
The case 30 is provided with a notch 71 that allows the vertical movement of the manual operation lever 70. A pin 73 penetrating the notch 71 is fitted into the vertically long hole 72 provided in the upper portion 64a to guide the vertical movement of the joint pin 64. Locking, unlocking, and code converting operations of the variable code cylinder lock A ₁ are the same as those in the first embodiment.

[0035]

Since the present invention is constructed as described above, it has the following effects. (1) In the conventional variable code type cylinder lock, when the code is converted in the incompletely inserted state of the key, there is a risk of becoming an unintended code different from the key, but in the variable code type cylinder lock of the present invention , Such a risk is surely prevented. (2) The complete insertion confirmation tumbler not only has the function of preventing key code conversion due to incomplete insertion of the key, but also has a key code check function as well as a set of tumbler pins, intermediate pins, and driver pins. Anti-theft property is improved. (3) When the key is removed, the complete insertion confirmation tumbler and the intermediate ring are engaged, so the plug will not rotate unnecessarily.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a key-uninserted state of a variable code cylinder lock.

FIG. 2 is a sectional view taken along line U-U of FIG.

FIG. 3 is a vertical cross-sectional view of a variable code cylinder lock with an initialization key inserted.

FIG. 4 is a sectional view taken along line VV of FIG.

5 is a cross-sectional view showing a state in which an unlocking operation is performed in the VV cross-sectional view of FIG.

FIG. 6 is a vertical cross-sectional view of a variable code cylinder lock for explaining an operation of a reset button.

7 is a cross-sectional view taken along the line WW of FIG.

FIG. 8 is a cross-sectional view of a variable code type cylinder lock for explaining a state where an initialization key is rotated 180 degrees.

9 is a sectional view taken along line XX of FIG.

FIG. 10 is a cross-sectional view of the variable code cylinder lock showing a state in which the second key is replaced.

FIG. 11 is a cross-sectional view of the variable code cylinder lock showing a state in which the second key has rotated 180 degrees and returned.

12 is a sectional view taken along line YY of FIG.

FIG. 13 is a sectional view showing a second embodiment of the operating portion of the joint pin.

FIG. 14 is a vertical sectional view showing a conventional example of a variable code type cylinder lock.

15 is a vertical cross-sectional view illustrating key code conversion by the variable code type cylinder lock of FIG.

[Explanation of symbols]

30 case 34 driver pin hole 35 push pin hole 36 joint pin hole 40 intermediate ring 41 intermediate pin hole 42 variable code pin hole 43 opening 45 engagement recess 46 plug 47 key hole 48 tumbler pin hole 49 tumbler accommodating chamber 53 driver pin 55 push Motion pin 56 Variable code pin 57 Intermediate pin 58 Tumbler pin 59 Complete insertion confirmation tumbler 60 Key insertion hole 61 Engagement protrusion 64 Joint pin 65 Engagement protrusion 66 Engagement recess 68 Reset pin 70 Manual operation lever K ₁ Initial setting key K ₂ Two keys

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-3-147988 (JP, A) JP-A-7-158326 (JP, A) JP-A-3-234275 (JP, A) Actual Kaihei 6- 76573 (JP, U) Actually open 59-157061 (JP, U) Actually open 57-68051 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) E05B 27/00-27 /Ten

Claims (5)

(57) [Claims] 1. A case having a cylindrical shape, in which driver pin holes and push pin holes are respectively arranged in the axial direction, and joint pin holes are provided on the rear side, and a case rotatably inserted into the case. An intermediate ring provided with an intermediate pin hole matching the driver pin hole, a variable code pin hole matching the push pin hole, and an opening matching the joint pin hole, and rotatably inserted in the intermediate ring a plug and tumbler pins hole from the opening to keyhole and said key hole matching the intermediate pin hole, and the hole communicating with the opening, and a Tan <br/> bra accommodating chamber communicating with the holes provided in the above A driver pin inserted into the driver pin hole and biased in a direction to engage with the intermediate pin hole, an intermediate pin having the same length as the intermediate pin hole and inserted into the intermediate pin hole, and an insert into the tumbler pin hole And the tumbler pins to be,
Variable code pins having a number that fills at least the variable code pin hole, a push pin inserted in the push pin hole and biased in a direction to push the variable code pin, and housed in the tumbler housing chamber, It is urged in the direction to project outward and is pushed in the opposite direction by the key to push the above
A complete insertion confirmation tumbler that inserts the protrusion into the hole of the lug, and a separable upper and lower part that is inserted into the joint pin hole and directed toward the complete insertion confirmation tumbler.
Energized to enter the hole in the plug and fully insert
Is constituted by the Joy <br/> Ntopin for pressing the lower portion to the protruding portion of the check tumbler, upper portion of the joint pin, the coupling surface of the lower portion, by fully inserted key through the full insertion verifier tumbler push When moved, it is located at a position that matches the outer peripheral surface of the intermediate ring, and the joint pin is provided with an operating portion that moves to a position where the lower end surface matches the outer peripheral surface of the plug. Variable code type cylinder lock. 2. The operating portion of the joint pin comprises a reset pin inserted in the case in parallel with the axial direction of the case, and a recess having an inclined surface is formed in an upper portion of the joint pin, and a key is provided. 2. The joint pin is moved by bringing the reset pin into contact with the inclined surface when is completely inserted into the keyhole.
Variable code type cylinder lock described. 3. The variable cord type cylinder lock according to claim 1, wherein the operating portion of the joint pin comprises a manual operating lever integrally formed on the upper portion of the joint pin. 4. The upper and lower connecting surfaces of the joint pin are formed into curved surfaces that are substantially the same as the outer peripheral surface of the intermediate ring, and the engaging projections provided on one end surface are provided on the other end surface. The variable code cylinder lock according to claim 1, wherein the variable code cylinder lock engages with the fitting recess in a detachable manner. 5. An engagement protrusion is formed at an end of the full insertion confirmation tumbler, and the engagement protrusion is engaged with an opening of the intermediate ring or an engagement recess formed at a position opposite to the opening. The variable code type cylinder lock according to claim 1.