JPH09235922A - Variable code type cylinder lock - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to surely engage with a variable code type cylinder lock by constituting the variable code type cylinder lock of a variable tumbler moving with a key and a tumbler plate engaging both ends of the variable tumber with each other, and releasing the engagement when the projection of a retractor is engaged therein. SOLUTION: A tumbler T is constituted of a variable tumbler 53 moving with a key to be inserted and a tumbler plate 52 having engagements 56 engaging both ends of the variable tumbler 53 with each other. One end of the tumbler T is detachable to an engaged recess section 44 formed on the internal circumference of a case 31, and when the other end is engaged in a side bar engaged groove 55 formed in the tumbler plate 52, a side bar 42 releasing the engagement with the engaged recess section 44 is inserted into one side of a plug 36. A projection 49 provided to one end thereof is brought into contact with the internal circumference of the case 31, and a retractor 48 bringing the other end into contact with the variable tumbler 53 is provided to the other side of the plug 36. When the projection 49 of the retractor 48 is engaged in the engaged recess section 44, the engagement of the variable tumber 53 with the tumbler plate 52 is released.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a variable code cylinder lock capable of improving the operability and safety of keys and increasing the certainty of operation.

[0002]

2. Description of the Related Art As a variable code type cylinder lock capable of changing a key code of a cylinder lock and returning to an old code, there is a technique described in JP-A-7-324531. This variable cord type cylinder lock is, as shown in FIGS. 14 and 15, a front surface of the cylindrical case 1 (the left end surface in FIG. 14).
Is provided with a peripheral wall 2 for preventing the plug 5 from protruding, and a hole 4 is provided in a flange 3 provided at the rear end of the case 1.
The flange 3 is screwed into the hole 4 (not shown).
Is attached to the back surface of the door D.

A plug 5 rotatably inserted in the case 1.
Is provided with a key hole 6 opened on the front surface and a plurality of tumbler holes 7 intersecting the key hole 6 at right angles. The tumbler holes 7 other than the rearmost part have a tumbler composed of a tumbler plate 26 and a variable tumbler 27. The side bar 23 that is inserted and urged in a direction projecting from the outer peripheral surface of the plug 5 is accommodated in the side bar accommodation hole 22 provided in one of the tumbler holes 7 and provided in the other side of the tumbler hole 7. The retractor accommodation hole 24 accommodates the retractor 25 that is biased in the direction in which it projects from the outer peripheral surface of the plug 5 (see FIG. 15).

A meshing portion 28 provided at one end of the tumbler plate 26 is meshed with a meshing portion 29 provided at one end of the variable tumbler 27 so that the meshing position can be changed, and the variable tumbler 27 is attached to a key inserted in the key hole. When pushed, the variable tumbler 27 and the tumbler plate 26 move integrally, and the concave portion formed on the left end surface of the tumbler plate 26 is aligned with the side bar 23.
Becomes immersive. Therefore, when the key K is inserted, the side bar 23 engaged in the engaging recess 1a provided on the inner peripheral surface of the case 1 can be retracted, and the plug 5 can be rotated.

A tumbler 9 for complete insertion confirmation is inserted into the tumbler hole 6 at the rearmost portion, and a joint cam 11 is rotatably inserted between a small-diameter outer peripheral surface 10 provided at the rear portion of the plug 4 and the case 1 to form a joint. A locking cam 12 is provided at the rear end of the cam 11. The reset plate 13 inserted into the small-diameter outer peripheral surface 10 is biased by the spring 14 in a direction projecting from the small-diameter outer peripheral surface 10, and is engaged with the engaging portion 15 provided in the joint cam 11. A cover mounting recess 16 is formed on the rear surface of the flange 3, and a protrusion 17 provided on the outer peripheral surface of the joint cam 11 is pivoted from a locking angle to an unlocking angle on the cover 17 mounted in the cover mounting recess 16. Stopper (not shown)
Are formed. A reset button 20 is inserted into a notch groove 19 that communicates with the engaging portion 15 from above the cover 17, and the reset button 20 is provided with an operating portion 20 a that projects rearward of the flange 3.

The variable code type cylinder lock has an operating portion 20a.
In a normal state in which is not operated, since the reset plate 13 is engaged with the engaging portion 15, the joint cam 11 and the plug 5 are engaged with each other. When the key K is inserted, the plug 5 becomes rotatable, and when the plug 5 and the joint cam 11 rotate from the locking angle to the unlocking angle, the locking cam 12 is unlocked and the door can be opened.

To change the key code by the administrator, the door D
When the operation portion 20a is pushed downward from the rear surface of the reset plate 20, the reset plate 13 pushed by the reset button 20 is pushed to the small-diameter outer peripheral surface 1.
The plug 5 and the joint cam 11 are disengaged from each other. Therefore, when the key K is rotated, only the plug 5 is rotated while the joint cam 11 is stopped. When the plug 5 is rotated by a predetermined angle (180 degrees), the retractor 25 is retracted into the engaging recess 1a, so that the engaging portions 28, 2
The engagement of 9 is released, the code becomes variable, and when the second key is inserted, the key code corresponding to the second key is converted.

Since the tip of the reset plate 13 which is disengaged from the engaging portion 15 is pressed by the inner peripheral surface of the joint cam 11, it remains in the small-diameter outer peripheral surface 10 and the second key is rotated by 180 degrees. When rotated, the plug 5 returns to the original locking angle, and the code conversion of the cylinder lock is completed by pulling out the second key.

[0009]

At the upper and lower ends of the key K, cords having heights corresponding to the cords of the respective tumblers 8 are provided at positions corresponding to the tumblers 8 when the keys K are inserted. Although the parts 21 are provided, since the tumblers 8 are arranged at a pitch with a small size, the upper end surface and the lower end surface of the key K are formed in a mountain shape whose height changes. A large amount of processing time is required to cut the upper and lower ends of the key K from a flat surface, and there is a problem that the manufacturing cost of the key K increases. Since a large number of peaks formed by the mountain cutting process project on the upper and lower end surfaces of the key K, there are problems that the peaks are easily worn and that clothes or fingers are caught in the peaks.

Tumbler plate 26 and variable tumbler 27
Has a possibility of wobbling in the tumbler hole 7 because it meshes at one place. Further, when the key K is inserted into the key hole 6 and rotated, a force in the direction of pulling the key K is applied to the variable tumbler 27, and there is a problem that the meshing portions 28 and 29 cannot be reliably engaged. An object of the present invention is to solve such a problem.

[0011]

In order to achieve the above object, a variable cord type cylinder lock according to the present invention comprises a plug rotatably inserted in a cylindrical case, a key hole opened at the front and a plug. A plurality of tumbler holes intersecting with the key hole is provided, and a tumbler that allows the key code to be changed when the plug is rotated at a predetermined angle is inserted into the tumbler hole, and a small-diameter outer peripheral surface formed on the plug. A reset engaging portion is provided on a joint cam that is rotatably inserted between the inner peripheral surface of the case and the reset tumbler inserted on the outer peripheral surface of the small diameter in the direction of engaging the reset engaging portion. In a variable cord type cylinder lock having a reset button for urging the case to release the engagement between the reset tumbler and the reset engaging portion, the tumbler is moved by a key inserted into the keyhole. The variable tumbler is composed of a tumbler plate having both ends of the variable tumbler that mesh with each other. One end of the variable tumbler can be engaged with and disengaged from an engaging recess formed on the inner peripheral surface of the case on one side of the plug. Yes, the side bar is inserted that is disengaged from the engaging recess when the other end is engaged with the side bar engaging groove formed in the tumbler plate. A retractor, in which the provided protrusion abuts the inner peripheral surface of the case and the other end abuts the variable tumbler, is inserted, and when the protrusion of the retractor engages with the engaging recess, the variable tumbler and the tumbler plate are provided. It is characterized in that the engagement of is released.

A peripheral wall projecting from the inner peripheral surface is provided at the front end of the case, and a key guide groove for restricting the insertion / extraction position of the key is provided in the peripheral wall, and the key passes through the key guide groove. Then, a retaining engagement portion capable of sliding contact with the inner surface of the peripheral wall when completely inserted can be provided.
Further, a protrusion may be formed on the tumbler plate, and a guide groove with which the protrusion is slidably engaged can be formed on the plug. The variable tumbler is formed with a protrusion and the protrusion is slidably engaged. A matching guide groove can be formed in the retractor. The case may be provided with an engagement groove with which the end of the tumbler can be engaged and disengaged, and a pair of rotation preventing recesses are formed on the inner peripheral surface of the case to be inserted into the tumbler hole of the plug. It is advisable to urge the complete insertion confirmation tumbler in a direction to engage with the rotation preventing recess.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION A specific example of an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a vertical sectional view of a variable code type cylinder lock when a key is inserted, and FIG. 2 is a variable code type cylinder lock. Of the variable cord type cylinder lock, FIG. 3 is a horizontal sectional view of the variable cord cylinder lock, and FIG. 4 is a front view of the variable cord cylinder lock.
5 is a sectional view taken along line AA of FIG. 2, FIG. 7 is a sectional view taken along line BB of FIG. 2, and FIG. 8 is a sectional view taken along line CC of FIG.

An annular peripheral wall 32 for preventing axial movement of a plug 36, which will be described later, is provided on the inner peripheral surface of the tip portion (the left end portion in FIG. 2) of the cylindrical case 31. Is provided with a key guide groove 33 for guiding key insertion and removal (see FIGS. 2 and 4). A flange 34 is provided at the rear end of the case 31, and the flange 34 is attached to the back surface of the door D by screws (not shown) inserted through holes 35 provided at the top and bottom of the flange 34.

The plug 36 rotatably inserted into the case 31 has a key hole 37 opening to the front and a plurality of tumbler holes 38 intersecting the key hole 37 at right angles and having both ends open to the outer peripheral surface of the plug 36. Is provided, and a tumbler hole 39 is provided at the rearmost portion (see FIGS. 2, 5, and 7). Tumbler hole 38
An elongated hole 40 parallel to the key hole 37 is provided on one wall surface, and the elongated hole 40 communicates with a side bar accommodation hole 41 opening to the outer peripheral surface of the plug 36 and accommodated in the side bar accommodation hole 41. The side bar 42 is provided with a tip end portion 43 to be inserted into the long hole 40, and an engaging portion 42 a formed in a mountain shape is formed on the opposite side of the tip end portion 43.

The engaging portion 42a is formed on the inner peripheral surface of the case 31 and can be engaged with and disengaged from an engaging concave portion 44 having an inclined surface which expands toward the opening (see FIG. 5). Since the springs 46 are inserted between the spring support protrusions 45 provided at both ends of the sidebar 42 and the sidebar housing holes 41 (see FIG. 3), the engaging portion 42 a of the sidebar 42 is formed on the inner circumference of the case 31. It is pressed against the surface.

From the other wall surface of the tumbler hole 38 to the plug 3
An elongated retractor accommodating hole 47 that is open to the outer peripheral surface of 6 and is parallel to the key hole 37 is provided. The engaging recess 44 is provided with a protrusion 49 that can be engaged and disengaged (see FIG. 5). Retractor 48
Since the springs 51 are inserted between the spring support protrusions 50 provided at both ends of the retractor and the retractor housing holes 47 (see FIG. 3), the protrusions 49 of the retractor 48 are pressed against the inner peripheral surface of the case 31.

Tumbler T inserted in the tumbler hole 38
Is composed of a tumbler plate 52 that is slidably contactable with one wall surface of the tumbler hole 38, and a variable tumbler 53 that is slidably contacted with the retractor 48. The inner peripheral surface of the case 31 has upper and lower end portions of the tumbler plate 52. An engaging groove 54 for engaging and disengaging is provided (see FIG. 5).

The tumbler plate 52 is provided with a side bar engaging groove 55 on the left end face thereof in FIG. 5 into which the tip end portion 43 of the side bar 42 can be engaged, and a serrated meshing portion is provided on the upper and lower portions of the right end face. Two projections 57, which are formed by pressing, are slidable in a guide groove 58 provided in the plug 36 (see FIGS. 3 and 5).

The variable tumbler 53 is formed with a recess 59 for avoiding interference with the key K inserted in the key hole 37.
9 is provided with a cord protrusion 61 that engages with a cord groove 60 provided in the key K (see FIGS. 1 and 5). A meshing portion 62 that meshes with the meshing portion 56 of the tumbler plate 52 is provided on the upper and lower portions on the left side of the variable tumbler 53, and a projection 63 formed by press working or the like is provided on the retractor 48 via the tumbler hole 38. It is slidably inserted into the guide groove 64 (see FIGS. 3 and 5).

The tumbler hole 39 at the rearmost portion is formed with a step portion 66 on the inner wall surface on the left side in FIG.
The tumbler 67 for confirming complete insertion, which is inserted into the spring, has a spring support projection 68 protruding from the left side surface thereof, and has a step 66 and a spring support projection 6
A spring 69 is inserted between the case 31 and the engagement projection 70 provided at the end of the complete insertion confirmation tumbler 67.
Is urged in a direction to engage with the rotation blocking recess 71 (see FIG. 7). Since the rotation-preventing recess 71 is formed wide for the convenience of the mold, the width of the rotation-preventing recess 71 is limited by driving the pin 86 later.

A key K is attached to the tumbler 67 for confirming complete insertion.
Is provided with a key insertion hole 72, and a code protrusion 73 is provided on the inner surface of the key insertion hole 72. In the code groove 60 of the key K, the code 60 for complete insertion confirmation is provided at a position facing the code protrusion 73 when the key K is completely inserted.
a is provided (see FIG. 3). In the present embodiment, one complete insertion confirmation tumbler 67 is provided and its position is provided at the rear of the tumbler T. However, a plurality of complete insertion confirmation tumblers 67 may be provided, and the position is limited to the rear of the tumbler T. Not something.

A small-diameter outer peripheral surface 74 is formed at the rear portion of the plug 4, a joint cam 75 is rotatably inserted between the small-diameter outer peripheral surface 74 and the inner peripheral surface of the case 31, and the end of the joint cam 75 is locked. A cam 76 is provided (see FIG. 1).
The small-diameter outer peripheral surface 74 is provided with a bottomed hole 77, and the bottomed hole 7
Since the spring 79 is inserted between the reset tumbler 78 inserted in 7 and the bottomed hole 77, the reset tumbler 7
The tip of 8 is biased in a direction projecting from the small-diameter outer peripheral surface 74, and the reset engaging portion 8 provided on the joint cam 75
0 (see FIGS. 1 and 8).

A cover mounting recess 81 is formed on the rear surface of the flange 34, and a projection (not shown) provided on the outer peripheral surface of the joint cam 75 is unlocked from the locking angle on the cover 82 mounted in the cover mounting recess 81. A stopper (not shown) is formed to allow rotation up to the lock angle. The reset engaging portion 80 is provided from above the cover 82.
The reset button 84 is inserted into the notch groove 83 communicating with the reset button 84, and the reset button 84 is provided with an operation portion 84a protruding rearward of the flange 34 (see FIG. 1).

The code groove 60 of the key K is milled by an end mill having a diameter of the width of the code groove 60, which has the advantage of shortening the processing time, and the code groove 60 is provided on both sides of the key K. It can be used even if the key K is turned 180 degrees. Since the code groove 60 is provided on both sides of the key K31, it is not necessary to cut the cord on the upper and lower surfaces of the key K31, and since the code has a groove shape, it does not hit external objects and is therefore wear resistant. The advantage is that the cord does not get caught on clothes or fingertips.

At the tip of the code groove 60, an opening 60b having an inclined surface that expands toward the tip of the key K is provided to facilitate insertion. When the key K is completely inserted, a slip-off preventing engagement portion 85 that is slidably contactable with the inner wall surface of the peripheral wall 32 of the case 31 is provided (see FIG. 1). The retaining engagement portion 85 can pass through the key guide groove 33 of the case 31, but is retained by the peripheral wall 32 while the key K is being rotated.

The operation of the variable code type cylinder lock configured as described above will be described with reference to the drawings in the order of the locked state of the cylinder lock, the unlocking operation by the initial setting key, and the code conversion operation by the primary variable setting key. . In the cylinder lock set to the initial code, the plug 36 is at the locking angle shown in FIG. 5, the engaging portion 42a of the side bar 42 is engaged with the engaging recess 44 of the case 31, and the side bar of the tumbler plate 52 is engaged. Since the engaging groove 55 is located at a position that does not coincide with the tip end portion 43 of the side bar 42, the plug 36 cannot rotate (see FIG. 5). In FIG. 5, the lower end of the tumbler plate 52 is engaged with the engaging groove 54 of the case 31, and the plug 36
The rotation of is blocked twice.

In the retractor 48, the projection 49 has a case 31.
Since the retractor 48 is pressed into contact with the inner peripheral surface of the retractor 48 and is retracted into the plug 36, the variable tumbler 53 pushed by the retractor 48 has a pair of upper and lower meshing portions 62.
Since the variable tumbler 53 and the tumbler plate 52 are in mesh with each other in a pair of upper and lower meshing portions 56, the meshing is reliable. Further, since the protrusion 57 of the tumbler plate 52 is engaged with the guide groove 58, it does not wobble even when pushed by the side bar 42, and the variable tumbler 53 is engaged with the guide groove 64, so that the retractor 48 is engaged. There is no wobbling.

The tip portion of the reset tumbler 78 projects from the small-diameter outer peripheral surface 74 of the plug 38 and the joint cam 75.
The joint cam 75 is engaged with the plug 36 because it is engaged with the reset engagement portion 80 (see FIG. 5). The complete insertion confirmation tumbler 67 is engaged in the rotation preventing recess 71 of the case 31.

When the initial setting key K is inserted into the key hole 37 via the key guide groove 33, the code protrusion 61 of the variable tumbler 53 is pushed by the code groove 60 of the key K, and the protrusion 63 of the variable tumbler 53 is retracted. In the tumbler plate 52 which moves along the guide groove 64 of the above and engages with the variable tumbler 53, the protrusion 57 moves along the guide groove 58. Therefore, the variable tumbler 53 and the tumbler plate 52 move smoothly as a unit without wobbling.

When the key K is completely inserted, the complete insertion confirming tumbler 67 whose cord projection 73 is pressed by the complete insertion confirming cord 60a of the cord groove 60 moves, and the engaging protrusion 70 causes the rotation preventing concave portion. Remove from 71 and sink into the plug 36. Since the reset tumbler 78 is engaged with the reset engagement portion 80 of the joint cam 75,
The plug 36 and the joint cam 75 are engaged with each other.

Since the tumbler plate 52 moves to the position where the side bar engaging groove 55 overlaps the tip end portion 43 of the side bar 42, the side bar 42 can move in the direction in which the engaging portion 42a is retracted into the plug 40. become. When the inserted key K is rotated in the unlocking direction (clockwise in FIG. 5), the engagement portion 42a is pushed out from the engagement recess 44 of the case 31 and rotated in the same direction to engage the plug 36. The joint cam 75 which is rotating integrally.

When the plug 40 is rotating, the retaining engagement portion 85 of the key K is in contact with the peripheral wall 32 of the case 31 (see FIGS. 1 and 11), so that the key K moves in the pull-out direction. Is prevented, and an unreasonable external force is not applied to the variable tumbler 53 and the complete insertion confirmation tumbler 67. Although the side bar 42 makes sliding contact with the inner peripheral surface of the case 31 and passes through the upper engaging groove 54 on the way (see FIG. 10), there is no possibility that the side bar 42 will fall into the upper engaging groove 54.

Similarly, the retractor 48 does not fall into the lower engaging groove 54 on the way, but comes into sliding contact with the inner peripheral surface of the case 31 (see FIG. 10), and the tumbler 67 for complete insertion confirmation is provided.
Also comes into sliding contact with the inner peripheral surface of the case 31 (see FIG. 12), and the reset tumbler 78 has a reset engaging portion 80 only at the tip.
The reset tumbler 78 does not protrude from the outer peripheral surface of the joint cam 75 (see FIG. 13).

When the plug 36 rotates about 135 degrees, the plug 36 reaches the unlocking angle, and the locking cam 76 unlocks the other side (the body pivotally attaching the door to which the cylinder lock is attached). The door can be opened. When the plug 36 is rotated counterclockwise by 135 degrees to the original locking angle, the key K can be removed, and when the key K is removed, the original locked state is restored.

When it becomes necessary to change the key code of the cylinder lock, when the operation portion 84a of the reset button 84 is pushed downward from the rear surface of the opened door D, the reset tumbler 78 pushed by the reset button 84 is pushed. Is sunk into the small-diameter outer peripheral surface 74 of the plug 36, and the engagement between the plug 36 and the joint cam 75 is released. Therefore, only the plug 36 can be rotated while the joint cam 75 is stopped.

When the plug 36 is rotated 180 degrees by the initial setting key K inserted in the key hole 37 while the reset button 84 is being pressed downward, the projection 49 of the retractor 48 overlaps with the engaging recess 44. , The retractor 48 is
Since the projection 49 moves in the direction in which it engages with the engagement recess 44, the variable tumbler 53 also moves in the same direction, and the pair of meshing portions 62 disengage from the pair of meshing portions 56 of the tumbler plate 52 (see FIG. 6).

The tumbler plate 52 is composed of the side bar 42.
However, the variable tumbler 53 whose tumbler plate 52 is disengaged can move along the guide groove 64 of the retractor 48 without wobbling. Reset tumbler 7
Since 8 is in contact with the inner peripheral surface of the joint cam 75 (see FIG. 9), the operation portion 84a of the reset button 84 may be released.

Next, when the initialization key K is pulled out, the engagement protrusion 70 of the tumbler 67 for complete insertion confirmation is engaged with the rotation preventing concave portion 71, and the plug 36 cannot be rotated. When the primary variable setting key is inserted into the key hole 37, only the variable tumbler 53 whose code projection 61 is pressed by the code groove 60 of the key moves along the guide groove 64 of the retractor 48.

When the primary variable setting key is completely inserted, the complete insertion confirmation code 60a of the key code groove 60 pushes the code protrusion 61 of the complete insertion confirmation tumbler 67, and the engagement protrusion 70 of the complete insertion confirmation tumbler 67 rotates. Motion-preventing recess 7
The plug 36 can be rotated away from the position 1. When the primary variable setting key is rotated by 180 degrees, the projection 49 of the retractor 48 is pushed out from the engaging recess 44 of the case 31 and is recessed in the plug 36, and the meshing portion 62 of the variable tumbler 53 pushed by the retractor 48 is moved. The tumbler T is converted into a key code of the primary variable setting key by engaging with a new position of the engaging portion 56 of the tumbler plate 52.

The number of key code conversions can be the same as the number of meshing positions of the meshing portion 62 and the meshing portion 56. If the number of key code conversions is increased, the lengths of the variable tumbler 53 and the tumbler plate 52 are increased. However, there is a problem that the diameter of the plug 36 that accommodates the tumbler plate 52 becomes large, but the engagement groove 54 is
2 has the effect of increasing the length and the effect of increasing the plug locking force when locking.

When the primary variable setting key is rotated 180 degrees and pulled out from the key hole 37, the locked state as shown in FIG. 5 is restored, and only the primary variable setting key can be locked and unlocked. As described above, the variable code type cylinder lock can be converted into a code suitable for the secondary setting key or the tertiary setting key, or can be returned to the code of the initial setting key K.

[0043]

Since the present invention is constructed as described above, it has the following effects. (1) Since the code groove is provided on the key, it is not necessary to cut the code on the upper and lower surfaces of the key, the processing time of the key is shortened, and the key can be provided at low cost. In addition, since the cord has a groove shape, it does not hit external objects, so that it has excellent wear resistance and there is no risk of the cord being caught on clothes or fingertips. (2) A key guide groove is provided on the peripheral wall of the case to control the key insertion / extraction position, so the key cannot be rotated unless the key is fully inserted, and the incomplete insertion of the key is reliably prevented. can do. Further, the key does not move in the removing direction during the rotation operation of the key, and an unreasonable external force is not applied to the tumbler, so damage to the tumbler is prevented. (3) If the tumbler is a type of cylinder lock that is composed of a variable tumbler and a tumbler plate, the meshing will be ensured by providing meshing parts on both ends of the variable tumbler and both ends of the tumbler plate. .

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a variable code cylinder lock with a key inserted.

FIG. 2 is a vertical sectional view of a variable code cylinder lock.

FIG. 3 is a cross-sectional view of a variable code type cylinder lock.

FIG. 4 is a front view of a variable code cylinder lock.

FIG. 5 is a sectional view taken along line AA of FIG. 2;

[Fig. 6] AA of Fig. 2 when the plug is rotated 180 degrees.
It is sectional drawing.

FIG. 7 is a sectional view taken along line BB of FIG. 2;

8 is a cross-sectional view taken along the line CC of FIG.

FIG. 9: CC of FIG. 2 when the plug is rotated 180 degrees
It is sectional drawing.

10 is a view showing a state in which a key is inserted and the plug is rotated in FIG.

FIG. 11 is a front view of the main part of the cylinder lock, showing a state where the key is inserted and the plug is rotated.

FIG. 12 is a view showing a state in which the key is inserted and the plug is rotated in FIG. 6;

13 is a view showing a state in which a key is inserted and the plug is rotated in FIG. 7. FIG.

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

FIG. 15 is a sectional view of FIG.

[Explanation of symbols]

 D door T tumbler K key 31 case 36 plug 37 key hole 38, 39 tumbler hole 41 side bar housing hole 42 side bar 42a engaging portion 44 engaging recess 47 retractor housing hole 48 retractor 49 projection 52 tumbler plate 53 variable tumbler 54 engagement Mating groove 55 Side bar engaging groove 56,62 Engaging portion 58,64 Guide groove 60 Code groove 61,73 Code protrusion 70 Engaging protrusion 74 Small diameter outer peripheral surface 75 Joint cam 78 Reset tumbler 80 Reset engaging portion 84 Reset button 84a Operation Part 85 Locking engagement part

Claims (6)

[Claims] 1. A plug rotatably inserted in a cylindrical case is provided with a key hole opened on the front surface and a plurality of tumbler holes intersecting with the key hole, and the plug has a predetermined angle in the tumbler hole. Insert a tumbler that allows the key code to be changed when it is pivoted to, and reset the joint cam that is pivotally inserted between the small-diameter outer peripheral surface formed on the plug and the inner peripheral surface of the case. The reset tumbler is provided with a joint portion, and the reset tumbler inserted into the small-diameter outer peripheral surface is urged in a direction to engage the reset engagement portion, and the case is released to disengage the reset tumbler from the reset engagement portion. In a variable code type cylinder lock provided with a button, the tumbler includes a variable tumbler which is moved by a key inserted in the keyhole, and a tumbler having both ends of the variable tumbler meshing with each other. One side of the plug, one end of which is engageable with and disengageable from an engaging recess formed on the inner peripheral surface of the case, and the other end of which is a side bar engaging groove formed on the tumbler plate. A side bar that is disengaged from the engaging recess when inserted is inserted, and a protrusion provided at one end contacts the inner peripheral surface of the case on the other side of the plug, and the other end is at the other end. A variable cord cylinder lock, wherein a retractor that abuts against the variable tumbler is inserted, and when the projection of the retractor engages with the engagement recess, the engagement between the variable tumbler and the tumbler plate is released. 2. A peripheral wall projecting from an inner peripheral surface is provided at a front end portion of the case, and a key guide groove for restricting a key insertion / extraction position is provided on the peripheral wall, and the key has the key guide groove. 2. The variable code type cylinder lock according to claim 1, further comprising a retaining engagement portion that is slidably contactable with the inner surface of the peripheral wall when the valve is completely inserted through the lock. 3. A protrusion is formed on the tumbler plate,
The variable cord type cylinder lock according to claim 1, wherein a guide groove with which the projection is slidably engaged is formed in the plug. 4. The variable cord type cylinder lock according to claim 1, wherein a projection is formed on the variable tumbler, and a guide groove with which the projection is slidably engaged is formed on the retractor. 5. The variable cord cylinder lock according to claim 1, wherein the case is provided with an engagement groove with which an end of the tumbler can be engaged and disengaged. 6. A pair of rotation preventing recesses are formed on an inner peripheral surface of the case, and a complete insertion confirmation tumbler inserted into a tumbler hole of the plug is inserted in the rotation preventing recess. The variable code type cylinder lock according to claim 1, wherein the variable code cylinder lock is biased.