JP2004232299A - Variable cylinder lock - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a variable cylinder lock which enables the setting of a keycode to be rapidly changed with ease. <P>SOLUTION: A first through-groove and a second through-groove which communicate with a key inserting hole are formed in the inner peripheral surface of an outer cylinder; the first through-groove is widely formed so that a back part of a key for ordinary use and that of a change key can be fitted thereinto; and the second through-groove is narrowly formed so that the only the back part of the change key can be fitted thereinto. At least one set of pinholes of the inner and outer cylinders communicating with each other houses a pin group which is composed of a bottom pin, a change pin, a driver pin and a spring, and the rest of the sets of the pinholes house the other pin groups which are composed of the bottom pin, the driver pin and the spring. The key is moved in the tail-end area of the insertion of the key in parallel with the central axis of the inner cylinder; the back part of the key escapes from the first through-hole so as to enter the key inserting groove; and the bottom pin is pressed by an uneven part for the keycode of the key. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved pin tumbler-type variable cylinder lock in which the key code of a common key that enables or disables rotation of an inner cylinder with respect to an outer cylinder can be changed as required. About.
[0002]
2. Description of the Related Art A conventional pin tumbler type variable cylinder lock includes an outer cylinder having a fitting hole formed in the front-rear direction, and a rotatable and axially immovable fitting in the fitting hole. A cylinder, a pin group that enters and exits between a plurality of pin holes formed radially in the outer cylinder and the inner cylinder, and a pin group that is inserted into a key insertion groove in the front-rear direction of the inner cylinder and moves the pin group. It consists of a key that makes the inner cylinder rotatable or non-rotatable with respect to the outer cylinder,
The plurality of pin holes of the outer cylinder and the inner cylinder are arranged in a plurality of rows so as to be aligned in the front-rear direction, and the inner peripheral surface of the fitting hole of the outer cylinder has an inner hole when the inner cylinder is rotated. A first through groove and a second through groove communicating with the key insertion groove of the cylinder are formed to have the same width in the front-rear direction;
A pin group consisting of a bottom pin, a change pin, a driver pin, and a spring is housed in at least one set of the pin holes of the inner cylinder and the outer cylinder that communicate with each other when the inner cylinder is rotated, while the remaining set of the The pin hole accommodates another pin group consisting of a bottom pin, a driver pin and a spring,
When the key is inserted into the key insertion groove of the inner cylinder to a predetermined depth, the key moves parallel to the center axis of the inner cylinder in the insertion end region, and the back of the key escapes from the first through groove to insert the key. It is configured such that the bottom pin is pushed into the groove and pressed by the key code concave and convex portion of the key (see JP-A-2002-4657).
[0003]
In this variable cylinder lock, after changing the setting of the key code, the key is pulled out from the key insertion groove of the inner cylinder with the back part fitted in the second through groove, while the key is removed from the outer cylinder. After setting the inner cylinder from rotatable (unlocked state) to unrotatable (locked state), the key is removed from the key insertion groove of the inner cylinder with the back part fitted in the first through groove. However, since the width of the first through groove and the width of the second through groove are formed to be equal to each other, the rotation range of the inner cylinder in unlocking and the rotation range of the inner cylinder in changing the key code setting are sharply distinguished. That is, assuming that the rotation direction of the inner cylinder in unlocking is clockwise, the rotation direction of the inner cylinder in changing the key code setting is defined in the counterclockwise direction.
[0004]
In a normal use mode in which an opening / closing body such as a door is locked to a fixed frame body such as a box body, a stopper plate which is engaged with and disengaged from a metal receiving body installed on the fixed frame body side is fitted to the tip shaft portion of the inner cylinder. And the rotation direction and rotation angle of the stopper plate in unlocking are controlled by the regulating disk fitted to the shaft of the inner cylinder. It is regulated by engaging and disengaging the end wall.
Therefore, when it is desired to change the key code setting, release the tightening and fastening by the bolts and nuts, remove the regulating disk and the clasp plate from the shaft portion of the inner cylinder, and complete the key code setting change. In addition, the regulating disk and the stopper plate must be re-fitted to the shaft portion of the inner cylinder, and the bolts and nuts must be re-tightened and fixed.
[0005]
Further, in the variable cylinder lock, the vertical dimension of the main section of the key in the cross section matches the vertical dimension in the cross section of the key insertion groove, but approaches the insertion terminal area from the beginning of key insertion. In the meantime, the main end portion of the key is inserted across the key insertion groove and the first through groove. Therefore, the vertical dimension in the cross section of the first through groove exists as a surplus dimension, and in the process of inserting the key, there is room for the main part of the key to swing with respect to the center axis of the inner cylinder. When the deflection is large, the tip of the key hits the inner end of the bottom pin, preventing the key from being inserted thereafter, and the key must be inserted again. Alternatively, the lock mechanism was mistakenly recognized as having failed, and the manufacturer or seller of the lock was required to repair or replace the lock mechanism.
[0006]
In the pin tumbler type cylinder lock including the variable cylinder lock, when the key insertion groove of the inner cylinder is viewed from the front side, the inner end of the bottom pin appears in the key insertion groove. There was a drawback that it was vulnerable to opening.
[0007]
[Patent Document 1] JP-A-2002-4657
[0008]
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to attach / detach a regulating disk or a stopper plate because the rotation range of the inner cylinder in unlocking and the rotation range of the inner cylinder in changing the key code are the same. It is an object of the present invention to provide a variable cylinder lock in which key code setting can be easily and quickly changed without the need for the extra work.
Another object of the present invention is to provide a variable cylinder lock which is excellent in operation stability without a risk of being mistaken as a failure of a lock mechanism because a key is smoothly inserted without a deflection. That is.
Still another object of the present invention is to provide a variable cylinder lock in which the inner end of the bottom pin is concealed, so that the picking operation from the front side of the key insertion groove is not easy, and security is improved. .
[0009]
According to the first aspect of the present invention, there is provided a variable cylinder lock comprising: an outer cylinder having a fitting hole formed in a front-rear direction; An inner cylinder rotatably fitted in the hole and immovable in the axial direction; a group of pins which enter and exit between a plurality of pin holes formed in the outer cylinder and the inner cylinder in a radial direction; A common key inserted into the key insertion groove in the direction to move the pin group to make the inner cylinder rotatable or non-rotatable with respect to the outer cylinder, and a change key inserted in the key insertion groove to change the key code Key and
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 peripheral surface of the fitting hole of the outer cylinder includes an inner cylinder when the inner cylinder is rotated. A first through groove and a second through groove communicating with the key insertion groove are formed in the front-rear direction, and the first through groove is provided wide so that the backs of the regular key and the change key are fitted. On the other hand, the second through groove is provided to be narrow so that only the back of the change key is fitted,
A pin group consisting of a bottom pin, a change pin, a driver pin, and a spring is housed in at least one set of the pin holes of the inner cylinder and the outer cylinder that communicate with each other when the inner cylinder is rotated, while the remaining set of the pins is The hole accommodates another pin group consisting of a bottom pin, a driver pin and a spring,
When the service key or change key is inserted into the key insertion groove of the inner cylinder to a predetermined depth, the service key or the change key moves parallel to the center axis of the inner cylinder in the insertion end region, and the back or the change key of the service key. The back portion escapes from the first through groove or the second through groove, enters the key insertion groove, and the bottom pin is pressed by the key code concave and convex portion of the regular key or the change key.
[0010]
According to the invention of claim 2, in addition to the configuration of the invention of claim 1, a guide groove is formed in the abdomen of the service key and the change key in the length direction of each key, and The inner wall surface of the entrance portion of the key insertion groove is provided with a guide projection fitted into the guide groove from the opening at the tip end of the guide groove, and the inner cylinder is provided at the inner end of the key insertion groove. A cam body having an upwardly inclined inclined cam surface is provided, and a downwardly inclined inclined groove portion is formed at a base end of the guide groove in parallel with the inclined cam surface.
According to a third aspect of the present invention, in addition to the configuration of the first or second aspect of the present invention, an extension wall concealing an inner end of the bottom pin is provided at an entrance of the key insertion groove of the inner cylinder. An escape recess for the extension wall is formed at the base end of each of the service key and the change key in parallel to the inclined groove of the guide groove.
According to a fourth aspect of the present invention, in addition to the configuration of the first, second, or third aspect, the second through groove is formed by an outward flange formed on the outer periphery of the front end of the inner cylinder. Is concealed.
[0011]
Embodiments of the present invention will be described in detail below with reference to the drawings.
A variable cylinder lock 1 according to an example of the present invention includes an outer cylinder 2, an inner cylinder 3, two types of pin groups 4 and 5, and a hole closing plate 6.
As shown in FIGS. 1 and 2, the outer cylinder 2 has a substantially cylindrical main body 20 having side surfaces formed in parallel, and a fitting hole 21 is formed in the center of the outer cylinder main body 20. As shown in FIG. 10, four sets of pin holes 22, 23, 24, and 25 are formed in the outer cylinder main body 20 in the radial direction so as to penetrate through the fitting hole 21 from the outer peripheral surface.
[0012]
Each row of the pin holes 22 and the pin holes 23 is constituted by five pin holes aligned at equal pitches, and each row of the pin holes 24 and the pin holes 25 is formed at six equal pitches. It consists of aligned pin holes.
The arrangement angle of the pin holes 22 and 23 with respect to the center of the outer cylinder 2 is 45 degrees, the arrangement angle of the pin holes 23 and 24 is 90 degrees, and the arrangement angle of the pin holes 24 and 25 is 45 degrees. Degrees. At the outer end of each of the pin holes, a fitting groove 26 of the hole closing plate 6 is formed.
[0013]
In the outer cylinder 2, a first through groove 27 and a second through groove 28 having a substantially rectangular cross section are formed in the inner surface of the fitting hole 21 in the front-rear direction, and as shown in FIG. The front end of the second through groove 28 is open to the front end large diameter portion 21 a of the fitting hole 21. As shown in FIG. 10, the second through groove 28 faces the row of the pin holes 24. The rear ends of the first through groove 27 and the second through groove 28 open to the rear end large diameter portion 21 b of the fitting hole 21. As shown in FIG. 11, an annular flange portion 29 is formed inward between the rear end large diameter portion 21b of the fitting hole 21 and the fitting hole main body.
The number and angular interval of the pin holes are not limited to those shown in the figure, and the pitches do not necessarily have to be equal.
[0014]
As shown in FIGS. 1 and 2, the inner cylinder 3 has an outward flange portion 31 formed at the front end of the substantially cylindrical main body 30, and the inner cylinder main body 30 rotates at the main body portion of the fitting hole 21 of the outer cylinder 2. The outer flange portion 31 is rotatably fitted to the large-diameter portion 21a at the front end of the fitting hole 21. A stop ring 11 is fitted into an annular groove 33 formed in a middle diameter shaft portion 32 at a rear portion of the inner cylinder 3, and the stop ring 11 is brought into contact with the back surface of the annular flange portion 29 of the outer cylinder 2 so that the inner cylinder 3 is prevented from moving in the axial direction.
The outward flange portion 31 is formed with a key back portion passage groove 31a that comes to a position overlapping with the first through groove 27 or the second through groove 28 of the outer cylinder 2 at the key insertion / removal position when viewed from the front side. .
[0015]
As shown in FIG. 10, a key insertion groove 34 is formed in the center of the inner cylinder main body 30 in the front-rear direction, and two sets of pin holes 35 and 36 are formed on both sides of the key insertion groove 34 in the radial direction. Have been. The hole array of the pin holes 35 is constituted by five pin holes arranged at equal pitches, and the hole array of the pin holes 36 is constituted by six pin holes arranged at equal pitches. 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, the arrangement angle of the pin hole 36 and the key insertion hole 34 is 135 degrees, and the arrangement angle of the key insertion groove 34 and the pin hole 35. Is 90 degrees. The inner end of each of the pin holes 35 and 36 is open to the key insertion groove 34 through a narrow portion to prevent the bottom pin from dropping.
An extended wall portion 30a is formed obliquely downward on the front surface of the inner cylinder main body 30, and conceals the vicinity of the upper side of the entrance of the key insertion groove.
[0016]
As shown in FIGS. 2 and 11, when the inner cylinder 3 is rotated to the key insertion / removal position, the bottom pin 51 is inserted into each pin hole 35 of the inner cylinder 3 and each pin hole 22 of the outer cylinder 2 which communicate with each other. , A pin group 5 including a driver pin 53 and a spring 54 are housed, while the second, third, fifth, and sixth pin holes 36 from the front of the inner cylinder 2 and the front of the outer cylinder 2 that are in communication with each other. In the second, third, fifth and sixth pin holes 24, another pin group 4 including a bottom pin 41, a change pin 42, a driver pin 43 and a spring 44 is accommodated. Further, the bottom pin 51, the driver pin 53, and the spring 54 are respectively provided in the first and fourth pin holes 36 from the front of the inner cylinder 2 and the first and fourth pin holes 24 from the front of the outer cylinder 2 which communicate with each other. The pin group 5 is accommodated.
[0017]
A guide projection 38 made of a pin is inserted and fixed in a lateral hole 37 formed on the outer surface of the outward flange portion 31 of the inner cylinder 3, and the inner end of the guide projection 38 is on one side of the key insertion groove 34. It protrudes from the inner wall surface. As shown in FIG. 11, a substantially right-angled triangular plate-like cam body 7 is tightly fitted to the inner end of the key insertion groove 34, and is fixed to the inner cylinder main body 30 by a transverse pin 73. The cam body 7 has an inclined cam surface 71 having an upward slope, and a vertical stop surface 72 is formed at the upper end of the inclined cam surface 71.
A regulating disk for rotation angle control and a stopper plate are fitted to the rear end small diameter shaft portion 39 of the inner cylinder 3 according to a known method so as to be relatively non-rotatable, and are fixedly fastened by a nut.
[0018]
As shown in FIGS. 3 and 5, the main portion of the common key 8 is composed of a back portion 81 and an abdomen portion 82, and the back portion 81 is fitted into the first through groove 27 of the outer cylinder 2 as shown in FIG. . A guide groove 83 having a rectangular cross section is formed on one side surface of the abdomen 82 in the length direction of the common key 8. The tip surfaces of the back portion 81 and the abdomen portion 82 are formed on an obliquely downward cam slope 84, and the tip of the guide groove 83 is open to the cam slope 84. At the base end of the guide groove 83, a downwardly inclined groove 85 is formed parallel to the cam slope 84.
As shown in FIGS. 3 and 10, two rows of key code concavo-convex portions 86 and 87 are formed on the side surface and the edge at an arrangement interval of 135 degrees on the abdomen 82 of the service key 8 as shown in FIGS. At the base of the abdomen 82, a recess 88 for escape into which the extension wall 30a of the inner cylinder 3 enters is formed obliquely downward.
[0019]
As shown in FIGS. 6 and 8, the main portion of the change key 9 is composed of a back portion 91 and an abdomen portion 92. The back portion 91 is fitted into the first through groove 27 of the outer cylinder 2 at the time of insertion as shown in FIG. And are fitted into the second through groove 28 of the outer cylinder 2 at the time of extraction. The back portion 91 is formed thinner than the abdomen 92 except for the root portion on the side of the knob. A guide groove 93 having a rectangular cross section is formed on one side surface of the abdomen 92 in the length direction of the change key 9. The tip surfaces of the back portion 91 and the abdomen 92 are formed on a cam slope 94 which is obliquely downward, and the tip of the guide groove 93 is open to the cam slope 94. At the base end of the guide groove 93, a downwardly inclined groove 95 is formed in parallel with the cam slope 94.
As shown in FIGS. 6 and 14, two rows of key code concave and convex portions 96 and 97 are formed on the side surface and the edge at an interval of 135 degrees on the abdomen 92 of the change key 9. At the base of the abdomen 92, a recess 98 for escape into which the extension wall 30a of the inner cylinder 3 enters is formed obliquely downward.
[0020]
In the variable cylinder lock according to this embodiment, in the locked state where the common key 8 is removed from the key insertion groove 34 of the inner cylinder 3 as shown in FIG. 1, the driver pins of each pin group 4 as shown in FIG. 43 and the driver pin 53 of each pin group 5 are fitted over the pin hole 22 of the outer cylinder 2 and the pin hole 35 of the inner cylinder 3, respectively, so that the inner cylinder 3 cannot rotate with respect to the outer cylinder 2. Is bound to. At this time, another driver pin 43 is entirely fitted in the pin hole 23 of the outer cylinder 2, and another driver pin 53 is entirely fitted in the pin hole 25 of the outer cylinder.
The key back passage groove 31a of the outward flange portion 31 is located at a position overlapping the first through groove 27 of the outer cylinder 2 when viewed from the front side, and the key back passage groove 31a is in communication with the first through groove 27. .
[0021]
The front opening of the guide groove 83 of the service key 8 is aligned with the guide projection 38 of the inner cylinder 3, the back 81 of the service key 8 is aligned with the key back passage groove 31 a of the outward flange 31, and the service key 8 is positioned inside. When the key is inserted into the key insertion groove 35 of the cylinder 3, the back portion 81 of the service key is inserted into the key insertion groove 34 in a state of slidingly contacting the inner bottom surface of the first through groove 27 by the guiding action of the guide projection 38 and the guide groove 83, During the insertion process, the service key 8 is inserted in a straight line without swinging or swinging with respect to the central axis of the inner cylinder 3. Therefore, the front end of the service key 8 does not abut against the inner end side surfaces of the bottom pins 41 and 51, and the insertion is not prevented.
[0022]
As shown in FIG. 16, the insertion of the regular key 8 into the first through groove 27 of the outer cylinder 2 and the key insertion groove 34 of the inner cylinder 3 progresses, and the cam slope 84 of the regular key 8 becomes inclined of the cam body 7. When the guide projection 38 comes into contact with the cam surface 71, the guide projection 38 comes to the intersection of the main portion of the guide groove 83 and the inclined groove 85. Thereafter, when the service key 8 is further depressed, the service key 8 moves parallel to the center axis of the inner cylinder 3 by the guiding action of the cam slope 84 and the inclined cam surface 71 and the guiding action of the guide projection 38 and the inclined groove 85. And is pushed up.
By this pushing-up operation, the back portion 81 of the common key 8 escapes from the first through groove 27 of the outer cylinder 2, and the entire cross section of the abdomen 82 and the back portion 81 enters the key insertion groove 34 of the inner cylinder 3, and the key code of the abdomen 82 The convex and concave portions 86 and 87 push up the bottom pins 41 and 51 of the corresponding pin groups 4 and 5.
[0023]
As shown in FIGS. 9, 10 and 11, when the bottom pins 41 and 51 of the pin groups 4 and 5 are pushed up by a predetermined distance, the contact point between the change pin 42 and the driver pin 43 in the pin group 4 is changed. It moves to the shear line between the outer cylinder 2 and the inner cylinder 3, and in the pin group 5, the contact point between the bottom pin 51 and the driver pin 53 moves to the shear line between the outer cylinder 2 and the inner cylinder 3. Therefore, the rotation restriction of the inner cylinder 3 with respect to the outer cylinder 2 is released, and the unlocked state is set.
Then, in FIG. 10, when the inner cylinder 3 is rotated clockwise by 45 degrees by the common key 8, the stopper plate (not shown) attached to the rear end small diameter shaft portion 39 of the inner cylinder 3 is moved to the fixed frame side. From the receiving part (not shown). When the inner tube 3 is rotated in this manner, the key back passage groove 31a of the outward flange portion 31 comes to a position overlapping the second through groove 28 of the outer tube 2 when viewed from the front side.
[0024]
At this stage, the pin hole 35 of the inner cylinder 3 is located at a position facing the pin hole 23 of the outer cylinder 2 as shown in FIG. 25, when the service key 8 is removed from the key insertion groove 34 of the inner cylinder 3 after the unlocking operation, the bottom pins 51 of the pin group 5 enter and exit the pin holes 23 of the outer cylinder 2 as appropriate. Then, the change pins 42 of the pin group 4 enter and exit the pin holes 25 of the outer cylinder 2 as appropriate. That is, in the variable cylinder lock according to the present embodiment, the service key 8 can be inserted and removed at two positions: the locked position and the unlocked position.
When the inner cylinder 3 is rotated from the locked position to the unlocked position in this manner, the key insertion groove 34 of the inner cylinder 3 comes to a position facing the second through groove 28 of the outer cylinder 2. Since the width in the circumferential direction of 28 is formed smaller than the thickness of the back portion 81 of the service key 8, the back portion 81 of the service key 8 does not fall into the second through groove 28.
[0025]
Next, when it is necessary to change the setting of the key code, the inner cylinder 3 is rotated to the position shown in FIG. 34, the second through groove 28 of the outer cylinder 2 and the key back passage groove 31a of the outward flange 31. Immediately after the service key 8 is pulled out, the driver pins 43 and 53 of the pin groups 4 and 5 are pushed toward the inner cylinder 3 by the action of the springs 44 and 54, so that a part of the driver pins 43 and 53 The inner cylinder 3 enters the pin holes 35 and 36 and is rotationally restrained with respect to the outer cylinder 2.
When the rotation of the inner cylinder 3 is stopped, the tip opening of the guide groove 93 of the change key 9 is aligned with the guide projection 38 of the inner cylinder 3 as shown in FIG. The change key 9 is inserted into the second through groove 28 of the outer cylinder 2 and the key insertion groove 34 of the inner cylinder 3 in accordance with the key back passage groove 31a of the orientation flange 31.
At this time, the change key 9 is inserted into the key insertion groove 34 with the back part 91 slidably in contact with the inner bottom surface of the first through groove 27 due to the guiding action of the guide projection 38 and the guide groove 93. Are inserted in a straight line without swinging or swinging with respect to the center axis of the inner cylinder 3. For this reason, the tip of the change key 9 does not abut on the side surface of the inner end of the bottom pins 41 and 51, and the insertion is not prevented.
[0027]
As shown in FIG. 17, the insertion of the change key 9 into the second through groove 28 of the outer cylinder 2 and the key insertion groove 34 of the inner cylinder 3 progresses, and the cam slope 94 of the change key 9 tilts the cam body 7. When the guide projection 38 comes into contact with the cam surface 71, the guide projection 38 comes to the intersection of the main portion of the guide groove 93 and the inclined groove 95. Thereafter, when the change key 9 is further depressed, the change key 9 is moved in parallel with the central axis of the inner cylinder 3 by the guiding action of the cam inclined surface 94 and the inclined cam surface 71 and the guiding action of the guide projection 38 and the inclined groove 95. And is pushed up.
By this pushing-up operation, the back part 91 of the change key 9 escapes from the second through groove 28 of the outer cylinder 2, the entire cross section of the abdomen 92 and the back part 91 enters the key insertion groove 34 of the inner cylinder 3, and the key code of the abdomen 92 The convex and concave portions 96 and 97 push up the bottom pins 41 and 51 of the corresponding pin groups 4 and 5.
[0028]
As shown in FIGS. 14 and 15, when the bottom pins 41 and 51 of the pin groups 4 and 5 are pushed up by a predetermined distance, the contact point between the change pin 42 and the driver pin 43 in the pin group 4 In the pin group 5, the contact point between the bottom pin 51 and the driver pin 53 moves to the shear line between the outer cylinder 2 and the inner cylinder 3. Therefore, the rotation restriction of the inner cylinder 3 with respect to the outer cylinder 2 is released. In FIG. 14, when the inner cylinder 3 is rotated 45 degrees in the counterclockwise direction by the change key 9, the key back passage groove 31 a of the outward flange portion 31 is inserted into the first through groove 27 of the outer cylinder 2 when viewed from the front side. Come to the overlapping position.
[0029]
At this stage, the pin hole 35 of the inner cylinder 3 comes to a position facing the pin hole 22 of the outer cylinder 2, while the pin hole 36 of the inner cylinder 3 comes to a position facing the pin hole 24 of the outer cylinder 2. Therefore, when the change key 9 is pulled out from the key insertion groove 34 of the inner cylinder 3, the bottom pins 51 of the pin group 5 correspond to the key code setting concave and convex portions 96 and 97 of the change key 9, and the pin holes of the outer cylinder 2 correspond to the pin holes. 22, the change pins 42 of the pin group 4 enter and exit the pin holes 24 of the outer cylinder 2 as appropriate.
Immediately after the start of the extraction of the change key 9, the change key 9 moves in parallel with the central axis of the inner cylinder 3 by the guiding action of the cam slope 94 and the inclined cam face 71 and the guiding action of the guide projection 38 and the inclined groove 95. Then, the back portion 91 of the change key 9 falls into the first through groove 27 of the outer cylinder 2 and the key back passage groove 31 a of the outward flange portion 31.
[0030]
When the change key 9 is extracted from the key insertion groove 34 of the inner cylinder 3, the first through groove 27 of the outer cylinder 2, and the key back passage groove 31 a of the outward flange 31, the key code setting concave and convex portions 96, 97. In response to the above, the change pin 42 of each pin group 4 moves into the pin hole 24 of the outer cylinder 2 or moves into the pin hole 36 of the inner cylinder 3, and the change pin 42 exists on the inner cylinder 3 side. The cylinder lock 1 is set to a new key code, and another new regular key 8 having that key code can be used.
In the variable cylinder lock of this embodiment that operates as described above, the rotation range of the inner cylinder 3 in unlocking and unlocking is the same as the rotation range of the inner cylinder 3 in changing the key code setting. There is no need to attach and detach the metal plate each time.
[0031]
The rotation angle of the inner cylinder 3 when performing unlocking or changing the setting of the key code is not limited to the above angle, and can be variously changed by adjusting the number of rows and the arrangement angle of the pin groups 4 and 5. Further, the guide grooves 83 and 93 may be formed on the left and right sides of the key abdomen 82 and 92, respectively, and the guide protrusions 38 may be provided in a pair on the left and right. In addition, the rotation range of the inner cylinder 3 in the key code setting change may be included in the rotation range of the inner cylinder 3 in unlocking.
[0032]
According to the variable cylinder lock of the present invention, the first through groove of the outer cylinder is provided wide so that the backs of the service key and the change key are fitted, while the second through groove of the outer cylinder is provided with the second through groove. The through groove is provided narrow so that only the back of the change key is fitted, and the rotation range of the inner cylinder in unlocking and unlocking is the same as the rotation range of the inner cylinder in changing the key code setting, or Since the rotation range of the inner cylinder 3 in the key code setting change is included in the rotation range of the inner cylinder 3 in locking, the key code does not need to be attached and detached each time the restricting disk or the stopper plate is attached and detached. Settings can be changed easily and quickly.
[0033]
In the variable cylinder lock according to the second aspect of the present invention, guide grooves are formed in the abdomen of the service key and the change key in the longitudinal direction of each key, and the leading end of the guide groove is formed at the entrance of the key insertion groove of the inner cylinder. A guide projection fitted from the side opening is provided, a cam body having an upwardly inclined inclined cam surface is provided at the inner end of the key insertion groove of the inner cylinder, and a downwardly inclined cam body is provided at the base end of the guide groove. Since the inclined groove portion is formed in parallel with the inclined cam surface, the insertion of the regular key or the change key is performed smoothly without shaking, and the key tip abuts against the inner end side surface of the bottom pin. By not being able to insert the lock mechanism, there is no possibility that the lock mechanism is mistaken for a failure, and the operation stability is excellent.
[0034]
In the variable cylinder lock according to the third aspect of the present invention, an extension wall portion is formed at the entrance of the key insertion groove of the inner cylinder to a position where the inner end of the bottom pin is concealed. Since the escape recess for the extension wall is formed at the base end in parallel with the inclined groove of the guide groove, the picking operation from the front side of the key insertion groove is not easy, and the security is improved.
[0035]
In the variable cylinder lock according to the fourth aspect of the present invention, since the front end opening of the second through groove is concealed by the outward flange formed on the outer periphery of the front end of the inner cylinder, it is difficult to detect the internal structure of the lock, and the security is improved. Is improved.
[Brief description of the drawings]
FIG. 1 is a front view of a variable cylinder lock according to an example of the present invention, showing a locked state.
FIG. 2 is a sectional view taken along line AA of FIG.
FIG. 3 is a right side view of a common key used for the variable cylinder lock of FIG. 1;
FIG. 4 is a rear view of the service key of FIG. 3;
FIG. 5 is a sectional view taken along line BB of FIG. 3;
FIG. 6 is a right side view of a change key used for the variable cylinder lock of FIG. 1;
FIG. 7 is a rear view of the change key of FIG. 6;
FIG. 8 is a sectional view taken along line CC of FIG. 6;
9 is a cross-sectional view corresponding to FIG. 2 in a state where the common key of FIG. 3 is inserted into the variable cylinder lock of FIG. 1;
FIG. 10 is a sectional view taken along line DD of FIG. 9;
FIG. 11 is a sectional view taken along line EE of FIG. 10;
FIG. 12 is a bottom view of an intermediate portion of the inner cylinder in the variable cylinder lock of FIG. 1;
FIG. 13 is a sectional view taken along line FF of FIG. 11;
14 is a sectional view corresponding to FIG. 2 in a state where the change key of FIG. 6 is inserted into the variable cylinder lock of FIG. 1;
FIG. 15 is a sectional view taken along line GG of FIG. 14;
FIG. 16 is a cross-sectional view corresponding to FIG. 11 when the service key is inserted close to the insertion end area.
FIG. 17 is a cross-sectional view corresponding to FIG. 15 when the change key is inserted to near the insertion end area.
FIG. 18 is a cross-sectional view corresponding to FIG. 10 when the inner cylinder is rotated to an unlocking position (key code changing position) by a regular key.
FIG. 19 is a sectional view corresponding to FIG. 14 when a change key is inserted to a required depth at a key code change position.
FIG. 20 is a cross-sectional view of the front end of the variable cylinder lock in a process of inserting a change key.
[Explanation of symbols]
1 Variable cylinder lock
2 outer cylinder
3 inner cylinder
Pin group including 4 change pins
5 Pins not including change pins
6 hole closing plate
7 Cam body
8 regular key
9 Change key
11 Stop ring
20 Outer cylinder body
21 Fitting hole
21a Large diameter part at front end
21b Large diameter part at rear end
22 pin hole
23 pin hole
24 pin hole
25 pin hole
26 mating groove
27 1st through groove
28 Second through groove
29 annular flange
30 Inner cylinder body
30a Extension wall
31 Outward flange
31a Key back passage groove
32 Medium shaft
33 annular groove
34 key insertion groove
35 pin hole
36 pin hole
37 Side hole
38 Guide projection
39 Rear end small diameter shaft
41 Bottom pin
42 change pin
43 Driver Pin
44 Spring
51 Bottom pin
53 Driver Pin
54 spring
71 Inclined cam surface
72 Vertical stop surface
73 Crossing Pin
81 back
82 abdomen
83 Guide groove
84 cam slope
85 Inclined groove
86 Key code irregularities
87 Key code irregularities
88 Escape recess
91 back
92 abdomen
93 Guide groove
94 cam slope
95 Inclined groove
96 Key Code Roughness
97 Uneven part for key code

Claims (4)

An outer cylinder having a fitting hole formed in the front-rear direction, an inner cylinder rotatably fitted in the fitting hole so as to be immovable in the axial direction, and a plurality of radial cylinders formed in the outer cylinder and the inner cylinder. A pin group which enters and exits between the pin holes, and a common key which is inserted into a key insertion groove in the front-rear direction of the inner cylinder and moves the pin group to make the inner cylinder rotatable or non-rotatable relative to the outer cylinder. And a change key that is inserted into the key insertion groove and changes 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 peripheral surface of the fitting hole of the outer cylinder includes an inner cylinder when the inner cylinder is rotated. A first through groove and a second through groove communicating with the key insertion groove are formed in the front-rear direction, and the first through groove is provided wide so that the backs of the regular key and the change key are fitted. On the other hand, the second through groove is provided to be narrow so that only the back of the change key is fitted,
A pin group consisting of a bottom pin, a change pin, a driver pin, and a spring is housed in at least one set of the pin holes of the inner cylinder and the outer cylinder that communicate with each other when the inner cylinder is rotated, while the remaining set of the pins is The hole accommodates another pin group consisting of a bottom pin, a driver pin and a spring,
When the service key or change key is inserted into the key insertion groove of the inner cylinder to a predetermined depth, the service key or the change key moves parallel to the center axis of the inner cylinder in the insertion end region, and the back or the change key of the service key. A variable cylinder lock in which the back portion of the variable cylinder lock escapes from the first through groove or the second through groove and enters the key insertion groove, and the bottom pin is pushed by the key code concave and convex portion of the regular key or the change key. A guide groove is formed in the abdomen of the service key and the change key in the length direction of each key, and the inner wall of the entrance portion of the key insertion groove of the inner cylinder is provided with a guide groove from a tip side opening of the guide groove. A guide projection fitted into the groove is provided, and the inner cylinder is provided with a cam body having an upwardly inclined inclined cam surface at a deep end of the key insertion groove, and a base end of the guide groove. The variable cylinder lock according to claim 1, wherein a downwardly inclined groove portion is formed in the portion in parallel with the inclined cam surface. An extension wall for concealing an inner end of the bottom pin is formed at an entrance of the key insertion groove of the inner cylinder, and the guide groove is formed at a base end of each of the service key and the change key. 3. The variable cylinder lock according to claim 1, wherein an escape recess for the extension wall is formed in parallel with the groove. 4. The variable cylinder lock according to claim 1, wherein the front end opening of the second through groove is concealed by an outward flange formed on the outer periphery of the front end of the inner cylinder. 5. .

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