KR100629616B1 - Variable type cylinder lock - Google Patents

Abstract

Provided is a variable cylinder lock that can easily and quickly change key code settings.

A first passage groove and a second passage groove communicating with the key insertion groove are formed in the inner circumferential surface of the outer cylinder, and the respective first portions of the commercial key and the change key can pass through the wide first passage groove, and the narrow second passage groove Only the back of the change key can pass. At least one set of inner and outer cylinders communicating with each other accommodates a pin group consisting of a bottom pin, a change pin, a driver pin, and a spring, and the other set of pin holes includes a bottom pin, a driver pin, and a spring. Is accepted. In the insertion end region of the key, the key moves in parallel with the central axis of the inner cylinder, the back portion of the key escapes from the first passage groove, enters the key insertion groove, and is formed by the recess for the key cord inclined into the groove shape of each key. Bottom pin is pushed.

Lock, adjustable cylinder lock, commercial key, change key, bottom pin, change pin, driver pin, spring.

Description

Variable cylinder lock {VARIABLE TYPE CYLINDER LOCK}

1 shows a locked state, and a front view of a variable cylinder lock according to one embodiment of the present invention;

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

3 is a right side view of a commercial key used in the variable cylinder lock of FIG.

4 is a left side view of the commercial key of FIG. 3;

5 is an enlarged cross-sectional view of the cut line C-C of FIG.

6 is a right side view of the change key used in the variable cylinder lock of FIG.

7 is a left side view of the change key of FIG. 6;

8 is an enlarged cross-sectional view of the cut line D-D of FIG.

9 is a cross-sectional view taken along the line B-B of FIG.

10 is a cross-sectional view of the original step of inserting the commercial key of Figure 3 into the variable cylinder lock of Figure 1,

11 is a cross-sectional view at the stage of inserting a commercial key to a vicinity of a predetermined insertion end region;

12 is a cross-sectional view at the step of inserting a commercial key to a predetermined insertion end region;

FIG. 13 is a cross-sectional view at the initial stage of inserting the change key of FIG. 6 into the variable cylinder lock of FIG. 1; FIG.

14 is a sectional view in the step of inserting the change key to the vicinity of the predetermined insertion end region;

15 is a cross-sectional view at the step of inserting the change key to a predetermined insertion end region;

16 is a cross-sectional view taken along the line E-E of FIG.

17 is a cross-sectional view taken along the line F-F of FIG.

18 is a cross-sectional view taken along the line G-G of FIG.

19 is a cross-sectional view corresponding to FIG. 2 in another embodiment of the present invention;

20 is a cross-sectional view corresponding to FIG. 11 in the other embodiment;

21 is a sectional view corresponding to FIG. 12 in the other embodiment;

(Explanation of the sign)

1 adjustable cylinder lock 2 outer cylinder

Pin group including 3 inner cylinder and 4 change pin

Pin group 6-hole occlusion plate not including 5 change pins

7 Cam Body 8 Commercial Key

9 Change Key 11 Snap Ring

12 Shear projection of inner cylinder 13 Stopper receiving hole

14 Concrete stopper 15 Stopper engagement recess

16 Stopper fastening recessed 17 Stopper fastening recessed

18 seat 19 nut center hole

20 Cylinder Body 21 Fitting Hole

21a shear large diameter 22 pin hole

23 pin hole 24 pin hole

25 pin hole 26 fitting groove

27 first pass groove 28 second pass groove

29 Fixing Plate 30 Inner Cylinder Body

30a extension wall 32 regulating disc

33 Annular groove 34 Key insert groove

35 pin hole 36 pin hole

37 Horizontal hole 38 Guide protrusion

39 Rear small diameter shaft part 41 bottom pin

42 Change Pin 43 Driver Pin

44 Spring 51 Bottom Pin

53 driver pins 54 spring

71 Slope cam face 72 Vertical stop

73 Supporting projection 81 Back of commercial key

82 Commercial key distribution 83 Commercial key guide groove

84 Cam Slope 85 Inclined Groove

86 First recess for key code of commercial key 87 Second recess for key code of commercial key

88 Relief recess 89 Extension groove

91 Change Key Back 92 Change Key Change

93 Guide groove for change key 94 Cam slope

95 Inclined groove 96 First recess for key code of change key

97 Second recess for key code of change key 99 Extension groove

The present invention relates to an improvement of a pin tumbler-type variable cylinder lock capable of setting and changing a key code of a commercially available key that makes the inner cylinder rotational or non-rotational with respect to the outer cylinder.

The conventional pin tumbler variable cylinder lock includes an outer cylinder having a fitting hole formed in the front and rear directions, an inner cylinder that is rotatably fitted to the fitting hole and cannot be moved in the axial direction, and the outer cylinder and the inner cylinder. A group of pins for entering and exiting between a plurality of radially formed pin holes, and a key inserted into a key insertion groove in the front and rear direction of the inner cylinder, and moving the pin group to make the inner cylinder rotatable or non-rotable with respect to the outer cylinder. under,

The plurality of pin holes of the outer cylinder and the inner cylinder are arranged in a plurality of rows aligned in the front-rear direction, and the inner circumferential surface of the fitting hole of the outer cylinder communicates with the key insertion groove of the inner cylinder when the inner cylinder is rotated. And the second passage grooves are formed in the same width in the front-rear direction,

At least one set of the inner and outer cylinders communicating with each other when the inner cylinder is rotated accommodates a pin group consisting of a bottom pin, a change pin, a driver pin, and a spring, while the remaining set of the pin holes includes a bottom pin, a driver. Another group of pins, consisting of a pin and a spring, is housed,

When the key is inserted into the key insertion groove of the inner cylinder to a predetermined depth, the key moves parallel to the central axis of the inner cylinder in the insertion end region so that the back of the key escapes from the first passage groove and enters the key insertion groove. And the bottom pin is pushed by the key code uneven portion of the key (see Patent Document 1).

In this variable cylinder lock, after the setting change of the key code is finished, the key can be pulled out from the key insertion groove of the inner cylinder while the back portion is engaged with the second passage groove, while the inner cylinder can be rotated relative to the outer cylinder ( After setting from the unlocked state to the non-rotational state (locking state), the key is pulled out from the key insertion groove of the inner cylinder in a state in which the back is coupled to the first passage groove. Since the width dimensions of the passage groove and the second passage groove are equally formed, the rotation region of the inner cylinder in the locking and unlocking and the rotation region of the inner cylinder in the key code setting change are strictly distinguished. In other words, when the rotational direction of the inner cylinder in the locking and unlocking is set clockwise, the rotational direction of the inner cylinder in the key code setting change is prescribed in the counterclockwise direction.

In a general use mode in which an opening or closing body such as a door is locked to a fixing frame such as a box body, a receiving metal body provided on the fixing frame side and a fixing iron plate which is caught and peeled off are engaged with the distal end shaft portion of the inner cylinder and attached to a bolt or nut. Fixed to the inner cylinder, and the rotational direction and the rotation angle of the fixing plate in the locking and unlocking are regulated by the control disk fitted to the shaft portion of the inner cylinder caught on the end wall of the regulating groove on the outer cylinder side and peeled off. .

Therefore, when the setting change of the key code is to be executed, the fastening by the bolt nut is released, the control disk and the fixing plate are separated from the shaft portion of the inner cylinder once, and the setting of the key code is finished. The regulatory disk and the fixing plate had to be fitted to the shaft portion of the inner cylinder again, and had to be tightened again by a bolt nut to fix the work.

Further, in the variable cylinder lock, the longitudinal dimension in the cross section of the main part of the key coincides with the longitudinal dimension in the cross section of the key insertion groove, from the beginning of the key insertion until it is close to the insertion end region. In, the main end portion of the key is inserted over the key insertion groove and the first passage groove. As a result, the longitudinal dimension in the cross section of the first passage groove is present as a surplus dimension, which gives room for the main part of the key to shake with respect to the central axis of the inner cylinder during the insertion of the key. When this shaking was large, the tip of the key collided with the inner end of the bottom pin, and subsequent insertion of the key was prevented, and the key had to be inserted again. Alternatively, the lock mechanism may be mistaken for failure, and a replacement of the lock may be required from the manufacture and sales of the lock.

In the cylinder lock of the pin tumbler type including a variable cylinder lock, when the said key insertion groove of the inner cylinder is seen from the front side, since the inner end part of the bottom pin is exposed to the key insertion groove, it is forcibly opened by picking tool. Weakness was difficult.

(Patent Document 1) Japanese Unexamined Patent Publication No. 2002-4657

The problem of the present invention is that the rotation area of the inner cylinder in the key code setting change is included in the rotation area of the inner cylinder in the locking and unlocking, so that no extra effort such as detaching the regulating disk or the fixing plate is required. It is to provide a variable cylinder lock that can change the key code setting simply and quickly.

Another object of the present invention is that the insertion of the key is performed smoothly without involving the shaking of the key itself or the unintentional rotation of the inner cylinder, and because the key remains stable at the insertion position, there is a fear that it will be mistaken for a failure of the lock mechanism. It is possible to provide a variable cylinder lock which is free and excellent in stability of operation.

Another object of the present invention is that the inner end of the bottom pin is concealed by the extending wall of the inner cylinder front part, so that picking operation from the front side of the key insertion groove is not easy, thereby providing an improved variable cylinder lock in security. It is.

Another object of the present invention is to provide a variable cylinder lock that contributes to improving the durability of the built-in pin and is effective for countermeasures against illegal copying of keys.

The variable cylinder lock according to the invention of claim 1 includes an outer cylinder having a fitting hole formed in the front and rear directions, an inner cylinder rotatably and axially fitted into the fitting hole, and radially connected to the outer cylinder and the inner cylinder. A group of pins for entering and exiting between the plurality of formed pin holes, a commercial key inserted into the front and rear key insertion grooves of the inner cylinder, and moving the pin group to make the inner cylinder rotatable or non-rotable with respect to the outer cylinder; A variable cylinder lock comprising a change key inserted into the key insertion groove for setting and changing a key code,

The plurality of pin holes of the outer cylinder and the inner cylinder are arranged in a plurality of rows aligned in the front-rear direction, and the inner circumferential surface of the fitting hole of the outer cylinder communicates with the key insertion groove of the inner cylinder when the inner cylinder is rotated. And a second passage groove is formed in the front-rear direction, and the first passage groove is provided with a wide width so that respective dorsal portions of the commercial key and the change key are fitted, while the second passage groove has only the back portion of the change key. It is installed narrowly so that it is fitted,

At least one set of the inner and outer cylinders communicating with each other when the inner cylinder is rotated accommodates a pin group consisting of a bottom pin, a change pin, a driver pin, and a spring, while the remaining set of the pin holes includes a bottom pin, a driver. Another fin group consisting of a pin and a spring is housed.

Guide grooves are formed in the lengthwise direction of each key on each side of the distribution of the commercial key and the change key, and an inner wall surface of the inlet portion of the key insertion groove of the inner cylinder extends from the front end opening of the guide groove to the guide groove. The guide protrusion is fitted, and the inner cylinder is provided with a cam having an upward gradient inclined cam surface at the inner end of the key insertion groove, and the inclined groove portion of the downward gradient is provided with the inclined cam surface at the proximal end of the guide groove. It is formed in parallel, the base end of the inclined groove portion is formed with an extended groove portion parallel to the main portion of the guide groove portion,

Each of the recesses for the key code on each side of the dorsal side of the commercial key and the change key is formed in a groove shape parallel to the inclined cam surface, and the inlet end thereof is opened in each dorsal cross section,

When the commercial key or the change key is inserted into the key insertion groove of the inner cylinder to a predetermined depth, the commercial key or the change key moves parallel to the central axis of the inner cylinder in the insertion end region so that the back of the commercial key or the change key Escapes from the first passage groove or the second passage groove and enters the key insertion groove, and the bottom pin is pushed by the recess for the key code of the commercial key or the change key,

When the commercial key or the change key is inserted to a predetermined insertion end region, the guide protrusion is arranged to engage with the extension groove portion of the guide groove.

The variable cylinder lock according to the invention of claim 2 includes an outer cylinder having a fitting hole formed in the front and rear directions, an inner cylinder rotatably fitted in the fitting hole so as not to be movable in the axial direction, and a radial direction of the outer cylinder and the inner cylinder. A group of pins for entering and exiting between the plurality of pin holes formed in the plurality of pin holes, and a commercial key inserted into the front and rear key insertion grooves of the inner cylinder to move the pin group to make the inner cylinder rotatable or non-rotable with respect to the outer cylinder; A variable cylinder lock comprising a change key inserted into the key insertion groove for setting and changing a key code,

The plurality of pin holes of the outer cylinder and the inner cylinder are arranged in a plurality of rows aligned in the front-rear direction, and a first passage communicating with the key insertion groove of the inner cylinder when the inner cylinder is rotated on the inner circumferential surface of the fitting hole of the outer cylinder. The groove and the second passage groove are formed in the front-rear direction, and the first passage groove is provided with a wide width so that the respective back portions of the commercial key and the change key are fitted, while the second passage groove is the back portion of the change key. Narrowly installed so that only

At least one set of the inner and outer cylinders communicating with each other when the inner cylinder is rotated accommodates a pin group consisting of a bottom pin, a change pin, a driver pin, and a spring, while the remaining set of the pin holes includes a bottom pin, a driver. Another fin group consisting of a pin and a spring is housed.

Guide grooves are formed in the longitudinal direction of each key on each side of the distribution of the commercial key and the change key, and an inner wall surface of the inlet portion of the key insertion groove of the inner cylinder extends from the front end side opening of the guide groove to the guide groove. The guide protrusion is fitted, and the inner cylinder is provided with a cam having an upward gradient inclined cam surface at the inner end of the key insertion groove, and the inclined groove portion of the downward gradient is provided with the inclined cam surface at the proximal end of the guide groove. Formed in parallel,

A stopper accommodating hole, each end of which is opened in the key insertion groove and the inner cylinder outer circumferential surface, is formed in the front end of the inner cylinder, and the stopper is accommodated in the stopper accommodating hole so as to be movable in the opening direction at both ends. In the inserting position of the commercial key or the change key, the stopper engaging recess facing the stopper receiving hole of the inner cylinder is formed in the inner surface of the fitting hole of the outer cylinder, and in the position inserted to the predetermined insertion end region, the inner cylinder The stopper engagement recessed part facing the said stopper accommodation hole of is formed in the side surface of the said commercial key and the change key.

In the initial step of inserting the commercial key or the change key into the key insertion groove, the stopper pushed by the side of the commercial key and the change key is engaged over the stopper accommodation hole and the stopper engagement recess. The stopper received by the stopper pushed on the inner surface of the stopper engagement recess when the inner cylinder is prevented from being rotated and the commercial key or the change key is inserted to a predetermined insertion end region to give a rotation moment to the inner cylinder. By engaging the hole and the stopper engagement recessed portion, the inner cylinder is rotatable,

When the commercial key or the change key is inserted into the key insertion groove of the inner cylinder to a predetermined depth, the commercial key or the change key moves parallel to the central axis of the inner cylinder in the insertion end region so that The dorsal portion escapes from the first passage groove or the second passage groove, enters the key insertion groove, and is arranged such that the bottom pin is pushed by the recess for the key code of the commercial key or the change key.

In the variable cylinder lock of the invention of claim 3, in addition to the configuration of the invention of claim 2, an extended groove portion parallel to the main portion of the guide groove portion is formed at the base end of the inclined groove portion of the guide groove, and the commercial key or the change When the key is inserted to a predetermined insertion end region, the guide protrusion is arranged to engage with the extension groove portion of the guide groove.

The variable cylinder lock of the invention of claim 4 is formed in a V-shape so that the opening width of the tip groove of the guide groove becomes wider toward the tip, in addition to the configuration of the invention of any one of claims 1 to 3.

The variable cylinder lock of the invention of claim 5 has an extension wall portion for concealing the inner end of the bottom pin at the inlet of the key insertion groove of the inner cylinder, in addition to the configuration of the invention of any one of claims 1 to 4. In each base end of the commercial key and the change key, a relief recess for the extended wall portion is formed in parallel with the inclined groove portion of the guide groove.

According to the variable cylinder lock of the invention of claim 6, in addition to the configuration of the invention of any one of claims 1 to 5, support protrusions protruding in the distal end of the first passage groove are provided in the outer cylinder, and the commercial key and When the change key is inserted up to a predetermined insertion end region, the tip end surface of the back portion of each key is arranged to abut on the support projection.

(Example)

An embodiment of the present invention will be described with reference to Figs.

This variable cylinder lock 1 has an outer cylinder 2, an inner cylinder 3, two types of pin groups 4 and 5, and a hole closure plate 6.

The fitting hole 21 is formed in the center part of the substantially cylindrical main body 20 of the outer cylinder 2, and as shown in FIG. 18, the outer cylinder main body 20 is fitted toward the fitting hole 21 from the outer peripheral surface. The rows of pin holes 22, 23, 24, 25 of the set are formed in the radial direction. Each of the hole rows of the pin hole 22 and the pin hole 23 is composed of pin holes arranged at five equal pitches, respectively, and each of the pin hole 24 and the pin hole 25 is formed. The row of holes consists of pin holes arranged at each six equal pitches.

The arrangement angle of the pinhole 22 and the pinhole 23 with respect to the center of the outer cylinder 2 is 45 degrees, and the arrangement angle of the pinhole 23 and the pinhole 24 is 90 degrees, and the pinhole 24 ) And the pin hole 25 are 45 degrees. The fitting groove 26 of the hole closure plate 6 is formed at the outer end of each of the pin holes.

In the outer cylinder 2, the first passage groove 27 and the second passage groove 28 having a substantially rectangular cross section are formed in the front and rear direction at the inner surface portion of the fitting hole 21, as shown in FIG. The front end of the first passage groove 27 and the second passage groove 28 is opened to the front end large diameter portion 21a of the fitting hole 21.

The number and angular spacing of the respective pin holes are not limited to those shown, and the respective pitches may not necessarily be the same pitch.

The shear projection 12 of the inner cylinder 3 is coupled to the shear large diameter portion 21a of the fitting hole 21 of the outer cylinder body 20. In the unplugged position of the commercial key, the front end protrusion 12 hides the second passage groove 28. A snap ring 11 is fitted into the annular groove 33 formed in the middle diameter shaft portion of the inner cylinder main body 30, and the snap ring 11 abuts against the rear surface of the outer cylinder main body 20, thereby causing an inner cylinder 3. Movement in the axial direction is prevented.

In the inner cylinder body 30, as shown in FIG. 18, a key insertion groove 34 is formed in the center portion in the front-rear axis direction, and two sets of pin holes 35 and 36 are arranged on both sides of the key insertion groove 34. It is formed in the radial direction. The hole row of this pin hole 35 is comprised by the pin hole arrange | positioned at six equal pitch, and the hole row of this pin hole 36 is comprised by the pin hole arrange | positioned at seven equal pitch. The arrangement angle of the pin hole 35 and the pin hole 36 with respect to the center of the inner cylinder 3 is 135 degrees, and the arrangement angle of the pin hole 36 and the key insertion hole 34 is 135 degrees, and the key insertion groove The arrangement angle of the 34 and the pin hole 35 is 90 degrees. The inner end of each of the pin holes 35 and 36 is opened in the key insertion groove 34 through the narrow portion to prevent entry of the bottom pin.

A downwardly inclined extension wall portion 30a is formed in the front portion of the inner cylinder main body 30 to conceal the vicinity of the upper edge portion of the inlet portion of the key insertion groove 34.

As shown in FIG. 1, the pin hole 35 formed in the wide inner wall surface of the key insertion groove 34 of the inner cylinder 3 is shown in FIG. Similarly, it communicates with the pin hole 22 of the outer cylinder 2. For example, as illustrated in FIG. 9, the first and fifth pin holes 35 in front of the inner cylinder 2 and the first and fifth pin holes 22 in front of the outer cylinder 2 are provided. The pin group 4 which consists of the bottom pin 41, the change pin 42, the driver pin 43, and the spring 44 is accommodated. 2nd, 3rd, 4th and 6th pin holes 35 from the front of the inner cylinder 2 and 2nd, 3rd, 4th and 6th respective pins from the front of the outer cylinder 2 The other pin group 5 which consists of the bottom pin 51, the driver pin 53, and the spring 54 is accommodated in the hole 22. As shown in FIG.

Moreover, the pin hole 36 formed in the corner | angular part of the key insertion groove 34 of the inner cylinder 3 communicates with the pin hole 24 of an outer cylinder in the position where the commercial key 8 is unplugged. Among the combinations of the pin holes 36 and the pin holes 24, which are prepared in seven sets, for any set, the pins include a bottom pin 41, a change pin 42, a driver pin 43, and a spring 44. The group 4 is accommodated, and the group of pins 5 consisting of the bottom pin 51, the driver pin 53, and the spring 54 is housed for the remaining sets.

As shown in Fig. 17, a guide protrusion 38 made of a pin is inserted and fixed to the horizontal hole 37 formed at the front end of the inner cylinder main body 30, and the inner end of the guide protrusion 38 has a key insertion groove. It protrudes from the inner wall surface of the one side of 34. At the inner end of the key insertion groove 34, a cam 7 having a substantially right triangle shape is integrally formed as shown in FIG. The cam 7 has an inclined cam surface 71 with an upward gradient, and a vertical stop surface 72 is formed at the upper end of the inclined cam surface 71.

The rear end small diameter shaft portion 39 of the inner cylinder 3 is fitted with the control disk 32 for controlling the rotation angle and the fixing plate 30 so as not to rotate relatively, and fastened by a nut 19.

As shown in FIG. 3, the main part of the commercial key 8 includes a back part 81 and a back part 82, and the back part 81 has a first passage groove of the outer cylinder 2 as shown in FIG. 10. (27) is fitted. A guide groove 83 having a rectangular cross section is formed in the longitudinal direction of the commercial key 8 on one side of the back portion 82. The front end surfaces of the back portion 81 and the back portion 82 are formed on the cam slope 84 inclined downward, and the tip portion 83a of the guide groove 83 is formed in a V shape to the cam slope 84. It is open. The cam slope 84 is formed in parallel with the cam slope 71 of the cam 7 of the inner cylinder 3. At the base end of the guide groove 83, the inclined groove portion 85 of the downward gradient is formed in parallel with the cam slope 84. An extended groove portion 89 is formed at the distal end of the inclined groove portion 85 in parallel with the main portion of the guide groove 83.

In the distribution 82 of the commercial key 8, as shown in Figs. 4 and 5, the first and second concave portions 86 and 87 for the key codes of two rows are provided at the side portions and the edge portions at an arrangement interval of 135 degrees. Formed. A relief recess 88 into which the extension wall portion 30a of the inner cylinder 3 enters is formed in a downward slope at the base portion of the back portion 82. The first concave portion 86 for the key code formed on the side portion of the distributing portion 82 of the commercial key 8 is formed to be elongated in a groove shape parallel to the cam slope 71 of the cam 7 of the inner cylinder 3. It is.

As shown in FIG. 6, the main part of the change key 9 includes a back portion 91 and a back portion 92. The back portion 91 is formed of the outer cylinder 2 when inserted as shown in FIG. 13. It fits in the 1st passage groove 27, and passes through the 2nd passage groove 28 of the outer cylinder 2, when pulling out. The back portion 91 of the change pin 9 is formed thinner than the back portion 92 except for the base portion on the handle portion side. Guide grooves 93 having a rectangular cross section are formed in the longitudinal direction of the change key 9 on one side surface of the rear part 92. The front end surfaces of the back 91 and the back 92 are formed on the cam slope 94 inclined downward, and the tip end of the guide groove 93 opens on the cam slope 94. The cam slope 94 is formed in parallel with the cam slope 71 of the cam 7 of the inner cylinder 3. At the base end of the guide groove 93, the inclined groove portion 95 of the downward gradient is formed in parallel with the cam slope 94. At the distal end of the inclined groove portion 95, an extended groove portion 99 is formed in parallel with the main portion of the guide groove 93.

As shown in Fig. 7 and Fig. 8, the first and second recesses 96 and 97 for key codes in two rows are provided at the side portion and the edge portion at an arrangement interval of 135 degrees. Formed. At the base part of the back part 92, the relief recessed part 98 into which the said extending wall part 30a of the inner cylinder 3 enters is formed in the downward inclination. The first concave portion 96 for the key code formed on the side surface portion of the back portion 92 of the change key 9 is formed to be elongated in the shape of a trough parallel to the cam slope 71 of the cam 7 of the inner cylinder 3. It is.

As shown in Fig. 16, the front end of the inner cylinder 3 is formed with a stopper accommodating hole 13 through which the end is opened at the key insertion groove 34 and the inner circumference of the inner cylinder. The stopper 14 which consists of this is accommodated so that a movement to both end opening directions is possible. A stopper engagement recess 15 facing the stopper accommodation hole 13 at the insertion and exit position of the commercial key 8 or the change key 9 is provided on the inner surface of the fitting hole 21 of the outer cylinder 2. Two are formed at intervals. In the position where the commercial key 8 or the change key 9 is inserted to a predetermined insertion end region, the stopper engaging recesses 16 and 17 facing the stopper receiving hole 13 of the inner cylinder 3 are commercially available. It is formed in the side surface of the key 8 and the change key 9, respectively.

In the initial step of inserting the commercial key 8 or the change key 9 into the key insertion groove 34, the stopper 14 pushed by the side of the commercial key 8 or the change key 9 is stopped in the stopper receiving hole ( 13) By moving the inside out, the stopper 14 is engaged over the stopper accommodation hole 13 and the stopper engagement recess 15. Thereby, the inner cylinder 3 is locked with respect to the outer cylinder 2, and rotation of the inner cylinder 3 is prevented. When the commercial key 8 or the change key 9 is inserted to a predetermined insertion end region and the rotation moment is applied to the inner cylinder 3, the stopper 14 pushed against the inner surface of the stopper engagement recess 15 is inward. And the stopper 14 is engaged over the stopper receiving hole 13 and the stopper engagement recessed portion 16 or 17. This releases the lock of the inner cylinder 3 with respect to the outer cylinder 2, and the inner cylinder 3 becomes rotatable.

In another embodiment shown in FIGS. 19 to 21, a pin-like support protrusion 73 is inserted and fixed in the radially penetrating hole of the tip end portion of the outer cylinder 2, and the support protrusion 73 has a first passage groove. It protrudes in (27), and the front-end | tip of the support protrusion 73 is located in the same level as the inner surface of the fitting hole 21 of the outer cylinder 2. As shown in FIG.

In the variable cylinder lock of this embodiment, as shown in FIG. 2, in the locked state in which the commercial key 8 is removed from the key insertion groove 34 of the inner cylinder 3, as shown in FIG. The driver pin 43 of (4) and the driver pin 53 of each group of pins 5 are the pin holes 22 and 24 of the outer cylinder 2, and the pin holes 35 and 36 of the inner cylinder 3, respectively. Since the inner cylinder 3 is engaged with the outer cylinder 3, the inner cylinder 3 is restrained from rotation with respect to the outer cylinder 2. At this time, the whole of the other driver pin 43 is engaged with the pin hole 23 of the outer cylinder 2, and the whole of the other driver pin 53 is engaged with the pin hole 25 of the outer cylinder.

When the commercial key 8 is inserted into the key insertion groove 34 of the inner cylinder 3, the back portion 81 of the commercial key is guided by the guide protrusion 38 and the guide groove 83 by the guide passage 38. 27 is inserted into the key insertion groove 34 in sliding contact with the inner bottom of the inner surface, and the commercial key 8 is inserted in a straight line without being shaken with respect to the central axis of the inner cylinder 3 during the insertion process. Therefore, the tip of the commercial key 8 does not collide with the inner end side surfaces of the bottom pins 41 and 51 so that travel is not prevented.

As shown in FIG. 11, the insertion of the commercial key 8 into the first passage groove 27 of the outer cylinder 2 and the key insertion groove 34 of the inner cylinder 3 proceeds to the vicinity of the insertion end region. When the cam slope 84 of the commercial key 8 hits the inclined cam surface 71 of the projection cam 7, the guide protrusion 38 is formed by the main portion of the guide groove 83 and the inclined groove portion 85. Coming to the intersection. Next, when the commercial key 8 is further pushed in, the commercial key 8 is operated by the guide action of the cam slope 84 and the inclined cam surface 71 and the guide action of the guide projection 38 and the inclined groove 85. Moves in parallel with the central axis of the inner cylinder (3).

In the final stage of insertion of the commercial key 8, the guide protrusion 38 is engaged with the extension groove portion 89 of the guide groove 83. In addition, in another embodiment shown in FIGS. 19 to 21, the end surface of the tip end portion of the back portion 81 of the commercial key 8 abuts against the tip end of the support protrusion 73.

By the pushing operation, the back portion 81 of the commercial key 8 escapes from the first passage groove 27 of the outer cylinder 2, and the front surface of the back portion 82 and the back portion 81 is the inner cylinder 3. Enters into the key insertion groove 34, and the first and second recesses 86 and 87 for the key cord of the back 82 push the bottom pins 41 and 51 of the corresponding pin groups 4 and 5, respectively. Up.

The bottom pins 41 and 51 of each of the pin groups 4 and 5 are pushed up by a predetermined distance, so that the contact point between the change pin 42 and the driver pin 43 in the pin group 4 is the outer cylinder 2. And the shear line between the inner cylinder 3 and the pin group 5 move the contact point of the bottom pin 51 and the driver pin 53 to the shear line between the outer cylinder 2 and the inner cylinder 3. Therefore, the rotational restraint of the inner cylinder 3 with respect to the outer cylinder 2 is canceled | released, and it enters a unlocked state.

Therefore, in FIG. 1, when the inner cylinder 3 is rotated 90 degrees clockwise by the commercial key 8, the clamping plate 30 attached to the rear end small diameter shaft part 39 of the inner cylinder 3 will be at the fixed frame side. The door is opened from the support metal part (not shown).

After the inner cylinder 3 is reversed by 90 degrees to the commercial key disengagement position of FIG. 1, and the fixing metal plate 30 is re-engaged to the receiving metal part, the commercial key 8 is the key of the inner cylinder 3. It is pulled out from the insertion groove 34. That is, in the variable cylinder lock of the present embodiment, the commercial key 8 can be removed and inserted only at one position in the locked position.

When the inner cylinder 3 is rotated between the locked position and the unlocked position, the key insertion groove 34 of the inner cylinder 3 comes to a position facing the second passage groove 28 of the outer cylinder 2, but the second Since the width dimension in the circumferential direction of the passage groove 28 is narrower than the plate thickness of the back portion 81 of the commercial key 8, the back portion 81 of the commercial key 8 has the second passage groove 28. There is no going into it.

Since the commercial key 8 used until then has been lost, when the need to execute the setting change of the key code occurs, the previous change key 9 corresponding to the conventional commercial key 8 is shown in FIG. Insert the commercial key into the inner cylinder (3). Insertion of the previous change key 9 positions the tip opening 93a of the guide groove 93 to the guide protrusion 38 of the inner cylinder 3, and the back portion 91 of the outer cylinder 2 first. It is performed by positioning to the passage groove 27.

At this time, the change key 9 of the previous change key 9 is guided by the guide protrusion 38 and the guide groove 93 in a state in which the back portion 91 is in sliding contact with the inner bottom surface of the first passage groove 27. It is inserted into the insertion groove (34). In the insertion process, the change key 9 is inserted in a straight line shape without swinging about the central axis of the inner cylinder 3. Therefore, the front end of the change key 9 does not collide with the inner end side surfaces of the bottom pins 41 and 51 so that travel is not prevented.

When the insertion of the previous change key 9 proceeds and the cam slope 94 of the previous change key 9 hits the inclined cam surface 71 of the cam 7, the guide protrusion 38 is a guide groove. It is near the intersection of the main part of 93 and the inclined groove 95. Next, when the previous change key 9 is further pushed in, the previous change is caused by the induction action of the cam slope 94 and the inclined cam surface 71 and the induction action of the guide protrusion 38 and the inclined groove portion 95. The key 9 is moved in parallel with the central axis of the inner cylinder 3 and is pushed up.

In the final step of inserting the previous change key 9, the guide protrusion 38 fits into the extension groove portion 99 of the guide groove 93, and at the same time the back portion 91 of the previous change key 9 The tip end surface abuts against the tip of the support protrusion 73.

By this pushing operation, the back part 91 of the previous change key 9 escapes from the first passage groove 27 of the outer cylinder 2, and the front face of the back part 92 and the back part 91 is the inner cylinder ( Bottom pins 41 and 51 of the pin group 4 and 5 that enter the key insertion groove 34 of 3) and to which the first and second recesses 96 and 97 for the key code of the rear part 92 correspond. Push up to release the rotational restraint of the inner cylinder 3 relative to the outer cylinder 2.

When the inner cylinder 3 is rotated 45 degrees by the change key 9 of FIG. 1 to the change-out / insertion position of FIG. 1, the pin hole 35 of the inner cylinder 3 is made into the pin hole 23 of the outer cylinder 2. As shown in FIG. On the other hand, since the pin hole 36 of the inner cylinder 3 faces the pin hole 25 of the outer cylinder 2, the conventional change key 9 is removed from the key insertion groove 34 of the inner cylinder 3. When pulled out, the bottom pin 51 of the pin group 5 enters and exits the pin hole 23 of the outer cylinder 2 appropriately in response to the first and second recesses 96 and 97 for key code setting. The change pin 42 of the group 4 enters in and out of the pin hole 25 of the outer cylinder 2 suitably.

After removing the previous change key 9 via the second passage groove 28 of the outer cylinder 2, the new change key 9 corresponding to the commercial key 8 to be used from now on is changed in FIG. Insert into the inner cylinder (3) at the key release and insertion position.

The insertion of this new change key 9 aligns the tip opening 93a of the guide groove 93 with the guide protrusion 38 of the inner cylinder 3, and the back portion 91 passes through the second passage of the outer cylinder 2. This is done by positioning the groove 28. By the guide action of the guide protrusion 38 and the guide groove 93, the new change key 9 is inserted into the key insertion groove in a state in which the back portion 91 is in sliding contact with the inner bottom surface of the second passage groove 28. It is inserted in 34. In the insertion process, the new change key 9 is inserted in a straight line shape without being shaken about the central axis of the inner cylinder 3. Therefore, the front end of the new change key 9 does not collide with the inner end side surfaces of the bottom pins 41 and 51 so that progress is not prevented.

When the new change key 9 is inserted, and the tip cam slope 94 hits the inclined cam surface 71 of the cam 7, the guide projection 38 is connected to the main portion of the guide groove 93. It is near the intersection of the inclined grooves 95. Next, when the new change key 9 is further pushed in, the new change key is induced by the induction action of the cam slope 94 and the inclined cam surface 71 and the induction action of the guide protrusion 38 and the inclined groove portion 95. (9) is pushed up in parallel with the central axis of the inner cylinder (3).

In the final stage of insertion of the new change key 9, the guide protrusion 38 is engaged with the extension groove 99 of the guide groove 93. In addition, in another embodiment shown in Figs. 19 to 21, the end surface of the tip portion of the back portion 91 of the new change key 9 abuts against the tip of the supporting protrusion 73. As shown in Figs.

By the pushing operation, the back portion 91 of the new change key 9 escapes from the second passage groove 28 of the outer cylinder 2, and the front surface of the back portion 92 and the back portion 91 is the inner cylinder 3. The bottom pins 41 and 51 of the pin group 4 and 5 which enter the inside of the key insertion groove 34 of the (), and the first and second recesses 96 and 97 for the key code of the rear part 92 correspond to. Push it up.

Next, when the new change key 9 is rotated back 45 degrees to the commercial key disengagement position shown in Fig. 1, the new change key 9 is inserted into the first and second recesses 96 and 97 for key code setting. Correspondingly, the change pin 42 of each pin group 4 moves into the pin hole 24 of the outer cylinder 2 or into the pin hole 36 of the inner cylinder 3 so that the change pin 42 is moved. Depending on whether it exists on the inner cylinder 3 side or on the outer cylinder 2 side, the cylinder lock 1 is changed to a new key code so that another new commercial key 8 having the key code can be used. Done.

The new change key 9 having completed the change of the key code is finally taken out from the inner cylinder 3 via the first passage groove 27 of the outer cylinder 2 at the commercial key disengagement position of FIG.

In the variable cylinder lock of this embodiment which operates in this way, the rotation area of the inner cylinder 3 in the key code setting change is included in the rotation region of the inner cylinder 3 in the locking and unlocking, and thus the key code setting change. There is no need to remove the control disk or fixing plate every time.

The rotation angle of the inner cylinder 3 in the execution of correcting and unlocking and changing the setting of the key code is not limited to the above angle, but can be variously changed by adjusting the number of rows and the arrangement angle of the pin groups 4 and 5. . In addition, the guide grooves 83 and 93 may also be formed on both left and right sides of the key distributions 82 and 92, and the guide protrusions 38 may be provided in pairs left and right. The rotation area of the inner cylinder 3 in the key code setting change can be included in the rotation area of the inner cylinder 3 in the locking and unlocking.

In the variable cylinder lock of the invention of claim 1, the first passage groove of the outer cylinder is provided with a wide width so that the respective back portions of the commercial key and the change key are fitted, while the second passage groove fits only the back portion of the change key. It is provided with a narrow width so that the rotation area of the inner cylinder in visibility and unlocking may be equal to the rotation area of the inner cylinder in key code setting change, or in the rotation area of the inner cylinder 3 in correction and unlocking. Since the rotation area of the inner cylinder 3 in the key code setting change is included, no extra effort such as detaching the regulating disk or the fixing plate is necessary each time, so that the setting change of the key code is simple and It can be done quickly.

In addition, when the commercial key or the change key is inserted to a predetermined insertion end region, the guide protrusion is engaged with the extension groove portion of the guide groove, so that the commercial key or the change key is aligned with the axis of the key insertion groove. It is maintained stably in the straight insertion posture, and the tip side of the commercial key or the change key is not shaken. Therefore, the contact point of the bottom pin and the driver pin, the contact point of the change pin and the driver pin, or the contact point of the bottom pin and the change pin is a shear line between the outer circumferential surface of the inner cylinder and the inner circumferential surface of the outer cylinder. Since the pin is refitted to the pin hole of the inner cylinder to prevent the rotation of the inner cylinder from being stopped, the inner cylinder can be smoothly rotated to the required angle. In this way, there is no fear of mistaken for failure of the lock mechanism, and a variable cylinder lock having excellent operation stability is provided.

In addition, since the recesses for the respective key codes of the commercial key and the change key are inclined in the shape of a trough, the engaging and peeling operations of the recesses for the key code and the bottom end of the bottom pin are performed smoothly without generating excessive stress. In addition, the durability of the pin is improved, and because of this special shape, it becomes strong against the illegal copying of the key.

In the variable cylinder lock of the invention of the second aspect, a stopper accommodation hole in which respective stages are opened in the key insertion groove and the inner cylinder outer circumferential surface is formed at the front end of the inner cylinder, and the stopper is provided in both stop opening directions in the stopper accommodation hole. A stopper engaging recess is formed in the inner surface of the fitting hole of the outer cylinder, which is movably received and faces the stopper receiving hole of the inner cylinder at the insertion / disengagement position of the commercial key or the change key. In the inserted position, the stopper engagement recessed portion facing the stopper receiving hole of the inner cylinder is formed on the side of the commercial key and the change key,

In the initial step of inserting the commercial key or the change key into the key insertion groove, the stopper pushed by the side of the commercial key and the change key is engaged with the stopper accommodation hole and the stopper engagement recess, While the rotation of the inner cylinder is prevented, when the commercial key or the change key is inserted to a predetermined insertion end region and the rotation moment is given to the inner cylinder, the stopper pushed on the inner surface of the stopper engaging recess is fixed to the stopper receiving hole and the Since the inner cylinder is configured to be rotatable by engaging with the stopper engaging concave portion, the inner cylinder is displaced and rotated during insertion of the commercial key or change key, and the pin hole on the inner cylinder side and the outer cylinder side are rotated. Location of the pin hole does not deviate.

Since the unexpected rotation of the inner cylinder is suppressed accurately by the stopper, the bottom pin, the change pin, and the driver pin are smoothly formed in the respective pinholes as the deep and shallow portions of the key cord recesses are shallow. You can move around, so correcting and unlocking according to the key code is executed correctly. In this way, there is provided a variable cylinder lock which is not easily mistaken for a failure of the lock mechanism and has excellent operation stability.

In addition, since the recesses for the respective key codes of the commercial key and the change key are inclined in the shape of a trough, the engaging and peeling operations of the recesses for the key code and the bottom end of the bottom pin are performed smoothly without generating excessive stress. In addition, the durability of the pin is improved, and because of this special shape, it becomes strong against the illegal copying of the key.                     

In the variable cylinder lock of the invention of claim 3, an extended groove portion parallel to the main portion of the guide groove portion is formed at the base end of the inclined groove portion of the guide groove, and the commercial key or the change key is extended to a predetermined insertion end region. When the guide projection is engaged with the extension groove portion of the guide groove when inserted, the commercial key or the change key is stably held in a straight insertion position along the axis of the key insertion groove. Or the tip side of the change key does not shake. Therefore, the contact point of the bottom pin and the driver pin, the contact point of the change pin and the driver pin, or the contact point of the bottom pin and the change pin is precisely on the shear line between the outer circumferential surface of the inner cylinder and the inner circumferential surface of the outer cylinder. It is maintained so that there is no fear that the rotation of the inner cylinder is restrained by re-engaging any one of the pins to the pin hole of the inner cylinder, so that the inner cylinder can be smoothly rotated to the required angle. In this way, there is provided a variable cylinder lock which is not easily mistaken for a failure of the lock mechanism and has excellent operation stability.

In the variable cylinder lock of claim 4, the opening of the tip end of the guide groove is formed in a V shape so that the opening width becomes wider toward the tip, so that the commercial key or the change key is inserted into the key insertion groove of the inner cylinder. When the guide projections touch the inclined inner surfaces of the V-shaped openings, the guide projections are apparently guided to the guide grooves, so that the insertion of each key can be made easily and accurately.

In the variable cylinder lock of the invention of claim 5, an extension wall portion for concealing the inner end of the bottom pin is formed at an inlet portion of the key insertion groove of the inner cylinder, and at each proximal end of the commercial key and the change key, Since a relief recess for the extended wall portion is formed in parallel with the inclined groove portion of the guide groove, picking operation from the front side of the key insertion groove is not easy and is improved in security.

In the variable cylinder lock of the sixth aspect of the present invention, when the support protrusion protruding in the distal end portion of the first passage groove is provided in the outer cylinder, and the commercial key and the change key are inserted to a predetermined insertion end region, Since the tip end face of the back of the key abuts the support projection, the commercial key or change key is stably held in a straight insertion posture along the axis of the key insertion groove, and thus the front end side of the commercial key or change key. This is not shaking. Therefore, the point of contact between the bottom pin and the driver pin, the point of contact between the change pin and the driver pin, or the point of contact between the bottom pin and the change pin are on the shear line between the outer circumferential surface of the inner cylinder and the inner circumferential surface of the outer cylinder. It can be maintained accurately, and the said inner cylinder can be smoothly rotated to a required angle, without any fear that the said pin will reengage with the said pin hole of the inner cylinder, and the rotation of the inner cylinder will be stopped. In this way, there is no fear of mistaken for failure of the lock mechanism, and a variable cylinder lock having excellent operation stability is provided.

Claims (6)

An outer cylinder having a fitting hole formed in the front-rear direction, an inner cylinder rotatably fitted to the fitting hole and immovably axially, and a pin passing in and out between the plurality of pin holes formed radially in the outer cylinder and the inner cylinder. A group key, a commercial key inserted into the front and rear key insertion grooves of the inner cylinder, and moving the pin group to make the inner cylinder rotatable or non-rotable with respect to the outer cylinder, and inserted into the key insertion groove to set a key code. A variable cylinder lock made of a change key to change, The plurality of pin holes of the outer cylinder and the inner cylinder are arranged in a plurality of rows aligned in the front-rear direction, and the inner circumferential surface of the fitting hole of the outer cylinder communicates with the key insertion groove of the inner cylinder when the inner cylinder is rotated; The second passage groove is formed in the front-rear direction, and the first passage groove is provided with a wide width so that the respective back portions of the commercial key and the change key are fitted, while the second passage groove has only the back portion of the change key. It is installed narrowly to fit, At least one set of the inner and outer cylinders communicating with each other when the inner cylinder is rotated accommodates a pin group consisting of a bottom pin, a change pin, a driver pin, and a spring, while the other set of the pin holes includes a bottom pin, a driver. Another group of pins, consisting of a pin and a spring, is housed, Guide grooves are formed in the lengthwise direction of each key on each side of the distribution of the commercial key and the change key, and an inner wall surface of the inlet portion of the key insertion groove of the inner cylinder extends from the front end opening of the guide groove to the guide groove. The guide protrusion is fitted, and the inner cylinder is provided with a cam having an upward gradient inclined cam surface at the inner end of the key insertion groove, and the inclined groove portion of the downward gradient is provided with the inclined cam surface at the proximal end of the guide groove. It is formed in parallel, the base end of the inclined groove portion is formed with an extended groove portion parallel to the main portion of the guide groove portion, Each of the recesses for each key code on each side of the back of the commercial key and the change key is formed in a groove shape parallel to the inclined cam surface, and the inlet end thereof is opened in each of the dorsal cross sections, When the commercial key or the change key is inserted into the key insertion groove of the inner cylinder to a predetermined depth, the commercial key or the change key moves parallel to the central axis of the inner cylinder in the insertion end region so that the back of the commercial key or the change key Escapes from the first passage groove or the second passage groove and enters the key insertion groove, and the bottom pin is pushed by the recess for the key code of the commercial key or the change key, And the guide protrusion is engaged with the extension groove portion of the guide groove when the commercial key or the change key is inserted to a predetermined insertion end region. An outer cylinder having a fitting hole formed in the front and rear directions, an inner cylinder rotatably and immovably fitted into the fitting hole, and a pin for entering and exiting between the plurality of pin holes radially formed in the outer cylinder and the inner cylinder; And a commercial key inserted into the group and the front and rear key insertion grooves of the inner cylinder to move the pin group so that the inner cylinder is rotatable or non-rotable with respect to the outer cylinder, and inserted into the key insertion groove. A variable cylinder lock made of a change key for setting change. The plurality of pin holes of the outer cylinder and the inner cylinder are arranged in a plurality of rows aligned in the front-rear direction, and the inner circumferential surface of the fitting hole of the outer cylinder communicates with the key insertion groove of the inner cylinder when the inner cylinder is rotated. And a second passage groove is formed in the front-rear direction, and the first passage groove is provided with a wide width so that respective dorsal portions of the commercial key and the change key are fitted, while the second passage groove has only the back portion of the change key. It is installed narrowly so that it is fitted, At least one set of the inner and outer cylinders communicating with each other when the inner cylinder is rotated accommodates a pin group consisting of a bottom pin, a change pin, a driver pin, and a spring, while the other set of the pin holes includes a bottom pin, a driver. Another group of pins, consisting of a pin and a spring, is housed, Guide grooves are formed in the longitudinal direction of each key on each side of the distribution of the commercial key and the change key, and an inner wall surface of the inlet portion of the key insertion groove of the inner cylinder extends from the front end side opening of the guide groove to the guide groove. The guide protrusion is fitted, and the inner cylinder is provided with a cam having an upward gradient inclined cam surface at the inner end of the key insertion groove, and the inclined groove portion of the downward gradient is provided with the inclined cam surface at the proximal end of the guide groove. Formed in parallel, A stopper accommodating hole, each end of which is opened in the key insertion groove and the inner cylinder outer circumferential surface thereof, is formed in the front end of the inner cylinder, and the stopper is accommodated in the stopper accommodating hole so as to be movable in the opening direction at both ends thereof. The stopper engaging recess facing the stopper accommodating hole of the inner cylinder is formed in the inner surface of the fitting hole of the outer cylinder at the insertion / disengagement position of the change key, and the stopper of the inner cylinder is inserted at a predetermined insertion end region. The stopper engagement recessed part which faces the receiving hole is formed in the side surface of the said commercial key and the change key, In the initial step of inserting the commercial key or the change key into the key insertion groove, the stopper pushed by the side of the commercial key and the change key is engaged over the stopper accommodation hole and the stopper engagement recess, While the rotation of the inner cylinder is prevented, when the commercial key or the change key is inserted to a predetermined insertion end region and the rotation moment is given to the inner cylinder, the stopper pushed on the inner surface of the stopper engaging recess is connected to the stopper receiving hole. By engaging the stopper engagement recessed portion, the inner cylinder is rotatable, When the commercial key or the change key is inserted into the key insertion groove of the inner cylinder to a predetermined depth, the commercial key or the change key moves parallel to the central axis of the inner cylinder in the insertion end region so that the back of the commercial key or the change key And escapes from the first passage groove or the second passage groove into the key insertion groove, and the bottom pin is pushed by the recess for the key code of the commercial key or the change key. The base end portion of the inclined groove portion of the guide groove is formed with an extended groove portion parallel to the main portion of the guide groove portion, And the guide protrusion is engaged with the extension groove portion of the guide groove when the commercial key or the change key is inserted to a predetermined insertion end region. The variable cylinder lock according to any one of claims 1 to 3, wherein the opening of the tip end portion of the guide groove is formed in a V shape so that the opening width becomes wider toward the tip end. The inlet portion of the key insertion groove of the inner cylinder is provided with an extension wall portion for concealing the inner end of the bottom pin, and each proximal end of the commercial key and the change key. And a relief recess for the extended wall portion is formed in parallel with the inclined groove portion of the guide groove. The support protrusion which protrudes in the front-end | tip part of the said 1st passage groove | channel is provided in the said outer cylinder, When the said commercial key and the change key are inserted to the predetermined insertion end area | region, A variable cylinder lock, characterized in that the tip end surface of each of the keys is arranged to abut the support protrusion.

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