JP2008297696A - Tumbler-type cylinder lock - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tumbler-type cylinder lock capable of being more safely managed than ever before. <P>SOLUTION: This tumbler-type cylinder lock comprises: an outer cylinder 1; an inner cylinder 2 which includes a plurality of movable tumblers 3 and code maintaining mechanisms 4, 8 and 9; a state switching member 10 which switches between the set state of making a key code maintained by the code maintaining mechanisms depending on a rotational position with respect to the inner cylinder, and the reset state of allowing change of the key code; and connection switching mechanisms 13, 14 and 15 which switch among modes of rotational-direction connection between the outer and inner cylinders and the state switching member. In the insertion of a conversion key, the connection switching mechanisms allow the inner cylinder to rotate with respect to the outer cylinder, and fix the state switching member to the outer cylinder. In the insertion of a normal key, the connection switching mechanisms allow the inner cylinder and the state switching member to integrally rotate with respect to the outer cylinder in the set state, and fix the inner cylinder and the state switching member to the outer cylinder in the reset state. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a tumbler-type cylinder lock that can convert a key code only by a key conversion operation without disassembling the lock.

  Conventionally, a plurality of disk tumblers are projected from the inner cylinder into the groove of the outer cylinder by the elastic force of the coil spring during locking, so that the inner cylinder does not rotate.When unlocking, the disk tumbler is inserted by inserting a key. As a well-known technique, there is a disc tumbler lock that is moved to the cylinder side and retracted from the groove of the outer cylinder so that the lock can be unlocked.

  By the way, as disclosed in Patent Document 1, a lever that can convert a key code only by a key conversion operation without disassembling the key code conversion of the reverse master key, the master key, and the normal key. There is a tumbler type cylinder lock. That is, this includes an outer cylinder, an inner cylinder having a plurality of tumblers inserted into the outer cylinder and a partition plate for partitioning each tumbler, and a part of the inner cylinder that protrudes toward the outer cylinder. Each of the tumblers is composed of a first tumbler and a second tumbler that are partially engaged with each other. The first tumbler and the second tumbler The unlocking position of each tumbler is changed by changing the position of engagement with the tumbler, and a fixing plate capable of fixing both the tumblers at a predetermined unlocking position is provided.

When performing key code conversion, first, a conversion key suitable for the current key code is inserted, and the inner cylinder is rotated 180 degrees to the conversion position. When the inner cylinder is rotated to the conversion position, the first tumbler shaft moves according to the tumbler shaft guide groove, and the engagement between the first tumbler and the second tumbler is released (reset state). In this state, when a key with a new key code (new normal key) is inserted, the second tumbler that has been energized moves backward in the reverse direction corresponding to the depth of the key crest of the key. . In this way, the positions of the plurality of second tumblers arranged in the longitudinal direction retreat in accordance with the depth of the new key code. Then, when the inner cylinder is returned to the original position from the state at the key code conversion position, the first tumbler shaft moves downward, and as a result, the engaging tooth portion of the first tumbler is also moved downward, The engaging tooth portion and the tooth portion of the second tumbler mesh with each other. As a result, the engaging tooth portion of the first tumbler and the tooth portion of the second tumbler are engaged, and a new key code is determined (set state).
JP-A-11-117584

  By the way, the conventional cylinder lock is configured so that a new key code can be set with a normal key after resetting an old key code with a conversion key. Therefore, it is possible to configure so that multiple key codes can be reset with a single conversion key.When managing multiple cylinder locks in rental apartments or apartments, a common conversion key can be used. There is an advantage that management can be easily performed by managing a plurality of cylinder locks.

  However, when the above management method is adopted, by stealing or duplicating the common conversion key, a plurality of cylinder locks can be unlocked with any normal key or its duplicate key. There is a problem that the danger in crime prevention is great.

  SUMMARY OF THE INVENTION The present invention solves the above-described problems, and an object of the present invention is to provide a tumbler-type cylinder lock that can manage the cylinder lock more safely than before.

  In order to solve the above-described problems, a tumbler-type cylinder lock of the present invention includes an outer cylinder, a plurality of tumblers configured to be movable, and a code holding mechanism that holds a key code set by the plurality of tumblers. A state switching member that switches between a set state in which the key code is held by the code holding mechanism and a reset state in which the key code can be changed according to a rotational position with respect to the inner tube, and the outer cylinder, A connection switching mechanism that switches a connection mode in a rotational direction between the inner cylinder and the state switching member, and the connection switching mechanism is configured to move the inner cylinder to the outer cylinder when the conversion key is inserted. The state switching member is fixed to the outer cylinder, and when the key is normally inserted, the inner cylinder and the state switching member are moved in the set state. And rotatable integrally with the serial outer tube, in the reset state, characterized in that for fixing the inner cylinder and the state switching member on the outer cylinder.

  According to this invention, when the conversion key is inserted, the inner cylinder can be rotated relative to the outer cylinder by the connection switching mechanism, and the state switching member is fixed to the outer cylinder (conversion mode during conversion). Therefore, it is possible to switch from the set state to the reset state and from the reset state to the set state. On the other hand, when the conversion key is not inserted, the inner cylinder and the state switching member can be integrally rotated with respect to the outer cylinder in the set state (normal connection mode), and the inner cylinder and the state switching member are in the outer cylinder in the reset state. Because it is fixed (fixed connection mode), when the normal key is inserted in the set state, it is possible to perform the locking operation and the unlocking operation in the set state, but in the reset state, the normal key is inserted. However, it cannot be shifted to the set state without rotating. Therefore, since the conversion key corresponds to the normal key, even if the conversion key is duplicated, there is little risk of crime prevention, and if it is reset, the cylinder lock can be disabled with the normal key. You can manage the cylinder lock more safely.

  In the present invention, the connection switching mechanism includes a connection member configured to be directly or indirectly engageable with the outer cylinder, the inner cylinder, and the state switching member, and the connection member is always forward. In a state of receiving a biasing force toward the inner cylinder, and is arranged so as to be movable along the key insertion direction between a front position engaged with the inner cylinder and a rear position engaged with the outer cylinder. The connecting member is pressed by the conversion key and disposed at the rear position when the conversion key is inserted, and the set state is set when the normal key is inserted. Then, the connecting member is arranged at the front position by the urging force, and in the reset state, the connecting member is held at an intermediate position between the front position and the rear position, so that the outer cylinder and the inner cylinder are doubled. It is preferable to engage the. According to this, since the connection mode can be switched by slightly moving the connecting member along the key insertion direction, the connection switching mechanism can be easily configured and the size can be reduced.

  In the present invention, the inner cylinder is provided with an engaging structure that engages with the connecting member in the rotational direction in the set state and the reset state, and the engaging structure is connected to the connecting member in the set state. Engaging in the rotational direction and holding the connecting member in the forward position, engaging in the rotational direction with the connecting member in the reset state and holding the connecting member in the intermediate position, and the connecting member It is preferable that it is configured not to engage in the rotational direction when it is disposed at the rear position. According to this, the forward position and the intermediate position of the connecting member in the key insertion direction are determined by the engaging structure provided in the inner cylinder and the engaging state of the connecting member. Can be reliably implemented.

  In this case, the engagement structure is formed on a rear end surface of the inner cylinder formed at a position where the connection member is not engaged in the rotation direction when the connecting member is disposed at the rear position. A first engagement recess that can be fitted to the connection member, and a second engagement formed on the rear end surface and shallower than the first engagement recess that can be fitted to the connection member in the reset state. A joint recess may be provided. Further, the engaging structure projects from the rear end surface of the inner cylinder at a height that does not engage in the rotational direction when the connecting member is disposed at the rear position, and the front position in the set state. A first engaging projection that engages with the connecting member in the rotational direction and holds the connecting member at the intermediate position in the reset state, and rotates when the connecting member is disposed at the rear position. Projecting on the rear end surface of the inner cylinder at a height that does not engage in the direction, and higher in the rotation state than the first engaging convex portion that engages with the connecting member in the intermediate position in the rotational direction. There may be a case where a second engagement convex portion is provided.

  According to the present invention, since a new key code cannot be set without a new conversion key corresponding to the new key code, the conversion key may correspond to the key code of each normal key. In addition, since the normal key can be disabled in the reset state, the safety can be greatly improved as compared with the prior art.

  The best mode for carrying out the present invention will be described below with reference to the drawings. FIG. 1 is an exploded perspective view of a tumbler-type cylinder lock that can be commonly used in each embodiment described below.

  As shown in FIG. 1, a tumbler type cylinder lock according to the present invention is arranged in an outer cylinder 1, an inner cylinder 2 that is rotatably inserted into the outer cylinder 1, and a partition groove 2 a that is partitioned in the inner cylinder 2. The plurality of swingable tumblers 3, the pinion 4 and the swing plate 5 that can be engaged with the tumbler 3, and a part of the inner cylinder 2, and pressed so as to protrude toward the outer cylinder 1. A side bar 6, a swing gear 7 supported by the swing plate 5 that can fix the tumbler 3 and the pinion 4 at a position avoiding the unlocking operation region of the tumbler 3, a cam follower shaft 8, a pinion follower shaft 9, From the lead cam 10 provided with a pair of cam holes 10a and 10b for slidably supporting both ends of each of the cam follower shaft 8 and the pinion follower shaft 9 in general. It has been made.

  At this time, a part of the tumbler 3 and the pinion 4 are disposed so as to be able to engage with each other, and the unlocking position of the tumbler 3 is changed by changing the engaging position and is supported by the swing plate 5. The swing gear 7 is configured to fix a part of the tumbler 3 (for example, corresponding to a high (shallow) portion of the keyway) at a position avoiding the unlocking operation area of the tumbler 3. The position avoiding the unlocking operation region of the tumbler 3 indicates the vicinity of the end of the tooth portion 3b of the tumbler 3 excluding the engagement portion with the pinion 4.

  As shown in FIG. 1 or FIG. 6, two strips 1a and 1b having an interval of, for example, 100 ° are formed along the longitudinal direction on the inner wall of the outer cylinder 1, and one end of a side bar 6 to be described later is engaged. I try to do it. The inner cylinder 2 is inserted into a substantially cylindrical lead cam 10 having a pair of cam holes 10a and 10b for slidably supporting both ends of the cam follower shaft 8 and the pinion follower shaft 9 on both side surfaces. The lead cam 10 itself is inserted into the outer cylinder 1. As shown in FIG. 6C, the cam holes 10a and 10b of the lead cam 10 are arranged side by side along the circumference, and one end side in the same direction is bent slightly inward.

  As shown in FIGS. 2 and 3, the tumbler 3 is formed in a substantially rectangular ring shape, and a semicircular protrusion 3a that engages with the key groove is provided at one side edge of the opening of the key hole at the center of the tumbler 3. In addition, one end side is slightly curved toward the outside, and a tooth portion 3b is provided in a part on the curved portion side. As shown in FIGS. 1 to 4, for example, ten of these tumblers 3 are inserted into each of the ten partition grooves 2 a formed in the inner cylinder 2, and project to the other end side of each tumbler 3. By attaching the support shaft 3d inserted into the arm 3c to the inner cylinder 2 so as to be rotatable, each tumbler 3 can swing up and down in the partition groove 2a of the inner cylinder 2 with the support shaft 3d as a fulcrum. It is like that.

  Further, as shown in FIGS. 2, 3 and 6, each tumbler 3 is inserted into the inner cylinder 2 and is fixed to the upper side of the arm portion 3c by the other end of the compression coil spring S which is held by the spring pressing plate 11 at one end. Is pressed toward the stopper wall surface V of the inner cylinder 2. Further, on both sides of all the tumblers 3, there are arranged confirmation tumblers 12 having a substantially U-shaped frame that can be swung together with the arm portion 3c via the support shaft 3d and urged by the compression coil spring S.

  As shown in FIGS. 1 and 6, ten pinions 4 are supported by the pinion follower shaft 9 corresponding to the ten tumblers 3, and both ends of the pinion follower shaft 9 are cam holes of the lead cam 10. It is arranged in the partition groove 2a of the inner cylinder 2 so that it can be engaged with and disengaged from the tooth portion 3b of each tumbler 3 by being pivotally supported along the slide 10b. Then, one side portion of the side bar 6 is engaged with the recess 4a formed at one end of each pinion 4, and both ends of the side bar 6 are urged in the direction of the outer cylinder 1 by the compression coil spring S. The tube 1 is engaged with one of the two grooves 1a and 1b on the inner wall.

  The swing gear 7 is pivotally supported by the inner cylinder 2 and is connected to the cam follower shaft 8 via a pair of substantially spindle-shaped swing plates 5 fitted on both sides of the swing gear 7. Are arranged in the partition groove 2a of the inner cylinder 2 so as to be detachable from the tooth portion 3b of each tumbler 3 by being slidably supported along the cam hole 10a of the lead cam 10. . That is, the swing gear 7 has an engaging claw portion 7a along its length direction, and the engaging claw portion 7a is detachably engaged with the gear 3b of each tumbler 3.

  Here, the pinion 4, the pinion follower shaft 9 and the cam follower shaft 8 constitute the cord holding mechanism. However, as the cord holding mechanism of the present invention, other mechanisms such as the holding mechanism similar to the above-described conventional structure may be used as long as the key code that defines the unlocking positions of a plurality of tumblers is maintained. Absent. The lead cam 10 provided with the cam hole 10a for guiding the cam follower shaft 8 and the cam hole 10b for guiding the pinion follower shaft 9 corresponds to the state switching member. Also with respect to this state switching member, the present invention is not limited to the lead cam 10 as long as it can switch between the set state and the reset state by rotating relative to the inner cylinder 2.

  As shown in FIGS. 1 and 4, a connecting claw 13 (corresponding to the connecting member) is moved forward by a compression coil spring S in a spring accommodating portion 14 b of the connecting cam 14 at the inner end of the inner cylinder 2. By being biased and engaged in the rotational direction, the inner cylinder 2 and the inner cylinder 2 can be rotated together. The connecting claw 13 is coupled to the lead cam 10 and the connecting cam 14 in the rotational direction by fitting into the engaging hole 10x and the engaging hole 14a. Here, when the normal key K2 having a short tip is inserted, the connecting claw 13 is not pushed by the normal key K2, as shown in FIG. Since it remains engaged with the portion 13a (see FIG. 1) and is integrated with the lead cam 10 and the connecting cam 14 engaged with the connecting claw 13 in the rotational direction, the inner cylinder 2, the lead cam 10, the connecting claw 13, The connecting cam 14 rotates in conjunction (normally connected mode). However, since the rotation restricting claw 14c (see FIG. 9) of the connecting cam 14 is restricted by the substantially linear rotation restricting portions 15b and 15c in the semicircular opening 15a at the center of the stopper plate 15, the inner cylinder 2 is a key code. Does not rotate to the conversion position.

  In the reset state of FIG. 3, the confirmation tumbler 12 at the rearmost part of the inner cylinder 2 is provided with a spring support protrusion 12 a corresponding to a step formed on one inner wall surface of the rear part of the inner cylinder 2. The engagement protrusion 12b provided at the end of the confirmation tumbler 12 is engaged with the gap between the pinion follower shaft 9 and the side bar 6 by the compression coil spring S interposed between the spring portion and the spring support protrusion 12a. ing. If the insertion of the normal key K2 is shallow, the confirmation tumbler 12 does not rotate, so the side bar 6 is locked by the groove 1a of the outer cylinder 1 and prevents the inner cylinder 2 from rotating.

  When the normal key K2 is normally inserted into the key hole, the confirmation tumbler 12 is rotated in the key groove of the normal key K2, and the engagement protrusion 12b of the confirmation tumbler 12 is a gap between the pinion follower shaft 9 and the side bar 6. Deviate from. The inner cylinder 2 itself can be rotated integrally with the key guide 18 and the connecting cam 14.

  As shown in FIGS. 1 and 4, on the key insertion side (front side) of the inner cylinder 2, a key guide 18 having a key hole at the center is rotatable with respect to the outer cylinder 1 via an outer cylinder cap 17. Arranged.

  On the other hand, as shown in FIG. 5, when the conversion key K <b> 1 whose tip is longer than the normal key K <b> 2 is inserted, the connecting claw 13 is pressed against the biasing force, and the connecting claw 13 is engaged rearwardly. The portion 13b protrudes rearward from the engagement hole 14a of the connecting cam 14, engages with the rotation restricting portions 15b and 15c of the stopper plate 15, and is fixed to the outer cylinder 1 via the C-ring-shaped retaining ring 16 It becomes. Further, the connecting cam 14 and the lead cam 10 are also fixed to the outer cylinder 1 through the connecting claw 13. However, the inner cylinder 2 is disengaged from the front engaging portion 13a of the connecting claw 13 and can be rotated to the key code conversion position (connected state during conversion).

  FIG. 6A shows an example of a normal use state of a lock that can be locked and unlocked by the normal key K2. When key code conversion is performed from this state, the following operation is performed. First, a conversion key K1 having a long tip is inserted in place of the normal key K2, and the inner cylinder 2 is made rotatable as described above and then rotated clockwise to the position shown in FIG. 6B (about 100 degrees). When the side bar 6 moves from the groove 1a shown in FIG. 6 (a) to the groove 1b shown in FIG. 6 (b) and engages, the pinion follower shaft 9 is moved as shown in FIG. 6 (c). The both ends of the pinion 4 slide outward in the clockwise direction to the end portion of the cam hole 10b of the lead cam 10, so that the engagement of the pinion 4 with the tooth portion 3b of the tumbler 3 is released.

  Here, when the conversion key K1 is pulled out from the key hole, the tumbler 3 is pressed and rotated until it abuts against the stopper wall V of the inner cylinder 2 by the urging force of the compression coil spring S, as shown in FIG. When the pinion 4 is disengaged from the tumbler 3 with respect to the tooth portion 3b as well as the swing gear 7, the key code is reset.

  In this state, the conversion key K11 having a new key code is inserted into the key hole, and the inner cylinder 2 is rotated counterclockwise. FIG. 7A shows the middle of the rotation (position immediately before the key code conversion). Here, the side bar 6 is positioned at a substantially middle portion between the two grooves 1a and 1b of the outer cylinder 1, while the tumbler 3 in the middle of rotation is provided with a projection 3a provided on one side of the opening and a conversion key K11. The high part of the keyway is in contact (or close proximity).

  At the same time, since both ends of the pinion follower shaft 9 slide outward along the cam hole 10b of the lead cam 10 as shown in FIG. 8A, the pinion 4 is as shown in FIG. Since the both ends of the cam follower shaft 8 of the swing gear 7 slide outward along the cam hole 10a of the lead cam 10, the swing gear 7 is disengaged from the engagement with the tooth portion 3b of the tumbler 3. As shown to Fig.7 (a), it contacts with the tooth | gear part 3b of the tumbler 3 in the position (upper figure in a figure).

  Here, when the conversion key K11 is further rotated counterclockwise to the position shown in FIG. 7B, both ends of the pinion follower shaft 9 are inserted into the cam hole 10b of the lead cam 10 as shown in FIG. 8B. 8 (a), the pinion 4 is kept out of engagement with the tooth portion 3b of the tumbler 3 as described above, while the cam follower shaft of the swing gear 7 is maintained. Since both ends of 8 slide inward along the cam hole 10 a of the lead cam 10, the engaging claw portion 7 a of the swing gear 7 engages with the upper end of the tooth portion 3 b of the tumbler 3.

At this time, since the swing gear 7 feeds the tumbler 3 counterclockwise by one tooth, the projection 3a of the tumbler 3 that has been in contact with the conversion key K11 is separated. As a result, the load on the tumbler 3 by the conversion key K11 is reduced, and wear damage of the tumbler 3 can be avoided accordingly.
When the conversion key K11 is further rotated counterclockwise to the position shown in FIG. 7 (c), both ends of the pinion follower shaft 9 extend along the cam hole 10b of the lead cam 10 as shown in FIG. 8 (c). The pinion 4 engages with the lower end of the tooth portion 3b of the tumbler 3 so that both ends of the cam follower shaft 8 of the swing gear 7 are inward along the cam hole 10a of the lead cam 10. As shown in FIG. 7B, the swing claw 7 is engaged with the upper end of the tooth portion 3b of the tumbler 3, and at the same time, the side bar 6 is also connected to the outer cylinder. 1 is engaged with one groove 1a.

  Thus, the tumbler 3 is fixed at a high key groove position (for example, a blank key position) by the swing gear 7 at a position avoiding the unlocking operation area of the tumbler 3, and at the position of the tumbler 3. When the pinion 4 is engaged with the tooth portion 3b of the tumbler 3, a new key code is set. Thereafter, the key corresponding to such a new key code can be locked / unlocked. When a new key code is set in this way, the tumbler 3 is fixed only at a high position of the key groove by the swing gear 7, so that wear damage of the key and the tumbler 3 can be reduced. That is, the tumbler 3 shown in FIG. 7 is rotated counterclockwise by the key groove shape of the conversion key to a position where the tumbler 3 can be engaged with the swing gear 7. Thus, the protrusion 3a is brought into a non-contact state with the key groove, and the wear prevention effect is achieved. However, another tumbler 3 corresponding to the low (deep) key groove portion does not mesh with the swing gear 7 because the amount of rotation in the counterclockwise direction is small, and therefore the key groove portion and the protrusion 3a of the tumbler 3 Transitions to the set state while touching.

[First Embodiment]
Next, the connection switching mechanism in the first embodiment of the cylinder lock configured as described above will be described in more detail. FIG. 9 is a rear view showing the present embodiment in the set state in which the key code is set as viewed from the rear side, and FIG. 10A is the outer cylinder 1, the connecting cam 14, and the stopper plate 15 in the set state. FIG. 10B is a rear view showing the state where the retaining ring 16 is removed, FIG. 10B is a rear view showing the state where the lead cam 10 and the connecting claw 13 are further removed in the same set state, and FIGS. FIG. 11 is a rear view showing the same structure as in FIGS. 10A and 10B in the reset state.

  In the set state shown in FIG. 9 and FIG. 10, the connecting claw 13 is not pushed when the key is not inserted and when the normal key K2 is inserted, so that the rear engaging portion 13b does not move backward from the inside of the engaging hole 14a of the connecting cam 14. Does not protrude. Therefore, when the normal key K2 is rotated, the inner cylinder 2, the lead cam 10, the connecting claw 13, and the connecting cam 14 rotate integrally with the outer cylinder 1. Here, the normal key K2 can be configured to perform a locking operation by rotating it to one side of forward and reverse rotations, and to perform an unlocking operation by rotating the normal key K2 to the other side. At this time, since the connection cam 14 is provided with the rotation restricting claw 14c as described above, the rotation restricting claw 14c comes into contact with the rotation restricting portions 15b and 15c provided in the opening 15a of the stopper plate 15. The rotational operation range is limited for both the forward and reverse rotation directions. In the case of the illustrated example, the rotation range to either the forward or reverse side is limited to about 90 degrees. That is, the normal key K2 is configured such that it can be rotated only to an angular position smaller than an angle necessary for transition between the set state and the reset state. This is to prevent the side bar 6 from fitting into the groove 1b in the normal connection mode.

  As shown in FIGS. 4, 5, and 10 (a), the lead cam 10 is provided with an engaging hole 10 x (rectangular shape) that engages with the connecting claw 13 in the rotation direction. The engagement hole 10x is engaged in the rotation direction, and the front engagement portion 13a projects forward through the engagement hole 10x. As shown in FIG. 10B, an engagement recess 2x (in the shape of a rectangle in the drawing) is formed on the rear end surface of the inner cylinder 2. And in the said set state, the inner cylinder 2 and the connection nail | claw 13 are couple | bonded in the rotation direction because the front engaging part 13a of the connection nail | claw 13 engages with the said engagement recessed part 2x. Further, on the rear end surface of the inner cylinder 2, an engagement recess 2y that can be engaged with the front engagement portion 13a of the coupling claw 13 in the rotation direction at an angle different from that of the engagement recess 2x is also formed. Then, as shown in FIGS. 11A and 11B, in the reset state, the front engaging portion 13a of the connecting claw 13 engages with the engaging recess 2y, whereby the inner cylinder 2 and the connecting claw 13 are engaged. Are combined in the direction of rotation. Here, since the engaging recess 2x is formed deep and the engaging recess 2y is shallower than that, when the connecting claw 13 engages with the engaging recess 2x, the engaging recess 2x is disposed at the front position. When it is engaged, it is arranged at the intermediate position closer to the rear than that. The rear end surface of the inner cylinder 2 and the engagement recess 2x and the engagement recess 2y correspond to the engagement structure, the engagement recess 2x corresponds to the first engagement recess, and the engagement recess 2y corresponds to the first engagement recess. This corresponds to two engaging recesses.

  FIGS. 12A, 12B and 12C show the state when the key is not inserted and the normal key K2 are inserted in the set state, the state when the conversion key K1 is inserted in the set state, and the reset state, respectively. It is an expanded partial sectional view which shows the mode at the time of the non-insertion of the conversion key K1 in and the time of insertion of the normal key K2 about the connection switching mechanism containing the connection nail | claw 13. FIG.

  As shown in FIG. 12A, when the conversion key K1 is not inserted in the set state and when the normal key K1 is inserted, the connecting claw 13 engaged with the lead cam 10 and the connecting cam 14 as described above is a coil spring. It is urged forward by the elastic force of S and is disposed at the front position. The front engaging portion 13a engages with the engaging recess 2x of the inner cylinder 2, while the rear engaging portion 13b of the connecting claw 13 is connected. Since it is drawn into the cam 14 and does not engage with the rotation restricting portions 15 b and 15 c of the stopper plate 15, the inner cylinder 2, the lead cam 10 and the connecting cam 14 are coupled in the rotation direction, and these are connected to the outer cylinder 1. It becomes a normal connection mode that can be rotated.

  When the conversion key K1 is inserted in this set state, as shown in FIG. 12 (b), the connecting claw 13 is pushed rearward and disposed at the rear position, and the front engaging portion 13a is moved to the engaging recess 2x. Since the rear engaging portion 13b protrudes rearward from the connecting cam 14 and is restricted by the rotation restricting portions 15b and 15c of the stopper plate 15, the connecting cam 14 and the stopper plate 15 are coupled in the rotation direction. The inner cylinder 2 is in a connecting state during conversion that is freely rotatable. In this connected state, when the conversion key K1 is rotated, the inner cylinder 2 and the lead cam 10 rotate relatively, so that the tumbler and the cord holding mechanism operate as shown in FIGS. 6 to 8, and initially the groove 1a. When the side bar 6 that has been fitted to the wheel rotates to the position where it engages with the groove 1b, the reset state is established.

  Further, when the conversion key K1 is removed in the reset state, the coupling claw 13 moves forward by the elastic force of the coil spring S as shown in FIG. 12 (c), and the front engagement portion 13a is engaged with the inner cylinder 2. By engaging with the mating recess 2y, it is arranged at an intermediate position (a position between the front position and the rear position along the key insertion direction). At this time, the connecting claw 13 not only engages the inner cylinder 2, the lead cam 10, and the connecting cam 14, but the rear engaging portion 13 b remains protruding from the connecting cam 14 toward the stopper plate 15. As a result, the inner cylinder 2, the lead cam 10, and the connecting cam 14 are all fixedly connected to the outer cylinder 1 in a non-rotatable manner.

  Next, a usage method and operation of the present embodiment configured as described above will be described. As shown in FIG. 4, even if the normal key K2 is inserted into the key hole, the tip of the key is formed short, so that the connecting claw 13 is not pushed. Therefore, since the inner cylinder 2, the lead cam 10, the connecting claw 13, and the connecting cam 14 are rotated in conjunction with each other, the tumbler is held by the cord holding mechanism and the set state is maintained as it is. Therefore, there is no transition to the reset state. In this embodiment, the rotation range is limited (plus or minus 90 degrees) by the rotation restriction by the rotation restriction claw 14c and the rotation restriction portions 15b and 15c of the stopper plate 15. Therefore, when the normal key K2 is inserted, the groove is formed. The side bar 6 engaged with 1a is configured not to rotate to a position (100 degrees) where it engages with the groove 1b.

  On the other hand, as shown in FIG. 5, when the conversion key K1 is inserted into the key hole, the conversion key K1 has a long tip, so that it passes the inner cylinder 2 and resists the connecting claw 13 against the urging force of the compression coil spring S. Can be pushed in. As a result, the connecting claw 13 is pushed and retracted to be in the above-described conversion mode. Therefore, when the conversion key K1 is used to rotate forward (for example, clockwise) to the key code conversion position, the above-described operation is performed. It can be shifted to the reset state by the procedure.

  When the conversion key K1 is pulled out after shifting to the reset state as described above, the connecting claw 13 returns to the front and engages with the engaging recess 2y as described above, and is placed at the intermediate position. Become. In this fixed connection mode, since the inner cylinder 2 is fixed in the rotational direction with respect to the outer cylinder 1, no rotation operation can be performed even if the normal key K2 is inserted. Therefore, if the conversion key K1 is used for the reset state, no operation can be performed on the cylinder lock even if there is a person who has the normal key K2 or its duplicate key. For example, if the reset key can be used with the conversion key K1 in the locked state, the person who has the normal key K1 or the duplicate key can be prevented from entering the room. In addition, if the reset key can be used with the conversion key K1 in the unlocked state, it is possible to prevent a person holding the normal key K1 or the duplicate key from being locked.

  Here, when there is a new conversion key K11, the new conversion key K11 is inserted in the reset state described above, and the inner cylinder 2 is rotated in the reverse direction (for example, rotated counterclockwise), thereby Thus, after the engagement position between the tumbler 3 and the pinion 4 is changed, the set state is restored, so that a new key code is set. Thereafter, locking and unlocking can be performed with a new normal key corresponding to a new key code. In this case, if the conversion key and the normal key have a corresponding key code, they can be used only for the cylinder lock. Therefore, even if the conversion key is stolen or copied, Risk can be reduced.

[Second Embodiment]
FIG. 13 is a rear view (a) and (b) showing the connection conversion mechanism in the set state of the second embodiment different from the above, and FIG. 14 is a rear view (a) showing the connection conversion mechanism in the reset state of the same embodiment. And (b). FIGS. 13 (a) and 13 (b) and FIGS. 14 (a) and 14 (b) are drawings corresponding to FIGS. 10 and 11 of the first embodiment, and show a state in which corresponding members are removed. . In the second embodiment, the structure other than the coupling conversion mechanism can basically be configured in the same manner as in the first embodiment, and therefore, the illustration of the same part is omitted and the description of the same part is omitted below.

  In the present embodiment, protrusions 21 and 22 are provided on the rear end surface of the inner cylinder 2 ′, and the protrusion 21 is formed lower than the protrusion 22. In addition, any of the protrusions 21 and 22 is set to a height that does not engage with the connecting claw 13 ′ in the rear position in the rotational direction. The connecting claw 13 'has a rear engaging portion 13b similar to that of the first embodiment, but the front engaging portion 13a is not provided and the front side is configured to be flat. A pair of (not shown semicircular) cutout portions 13a ′ for accommodating the protrusions 21 are formed.

  In the present embodiment, as shown in FIG. 13, in the set state, the protrusion 21 of the inner cylinder 2 'is accommodated in the notch 13a' provided in the connecting claw 13 'so as to rotate with the connecting claw 13'. The protrusion 22 is provided at a position where it does not interfere with the connecting claw 13 '. At this time, the connecting claw 13 'is pressed onto the rear end surface of the inner cylinder 2' by the same urging force as in the first embodiment, and is arranged at the front position. Here, when the conversion key K1 (not shown) is inserted, the connecting claw 13 'is pushed backward similarly to the first embodiment, and retracts to a position where it does not interfere with the protrusions 21 and 22 (rear position). 2 '(projection 21) and coupling claw 13' are disengaged, and it is possible to shift to the reset state as in the first embodiment.

  On the other hand, as shown in FIG. 14, in the reset state, the connecting claw 13 'is disposed at a position overlapping the protrusion 21 of the inner cylinder 2'. Therefore, when the conversion key K1 is removed, the protrusion 21 resists the urging force. Then, the connecting claw 13 'is held and disposed at the intermediate position. At this time, the protrusion 22 higher than the protrusion 21 is engaged with the side edge of the connecting claw 13 ′, and the inner cylinder 2 ′ and the connecting claw 13 ′ are coupled in the rotational direction.

  In the above reset state, by inserting the above-mentioned new conversion key K11, the connection claw 13 'is again pushed backward, and the projections 21 and 22 are not engaged in the rotational direction. Since the transition is made to the connection mode at the time of conversion, a new key code can be set in the same manner as described above. The rear end surface of the inner cylinder 2 and the protrusions 21 and 22 correspond to the engagement structure, the protrusion 21 corresponds to the first engagement protrusion, and the protrusion 22 corresponds to the second engagement protrusion. To do.

  The configurations of the first embodiment and the second embodiment described above are merely examples of the embodiment of the present invention, and it is needless to say that various modifications can be made without departing from the gist of the present invention. For example, various mechanisms equivalent to the above configuration can be used for the conversion switching mechanism. Further, the state switching member is not limited to the lead cam, and various mechanisms for operating the cord holding mechanism according to the relative rotational position with respect to the inner cylinder can be easily conceived. Further, the engaging structure of the connecting members 13 and 13 ′ and the inner cylinders 2 and 2 ′ is not limited to the above configuration, and the connecting members are arranged at the front position and the intermediate position in the set state and the reset state, respectively. Various structures can be used as long as the structure can be engaged in the rotational direction in the state.

The disassembled perspective view of the cylinder lock in the best form for implementing this invention. The partial schematic perspective view explaining the arrangement | positioning relationship between the tumbler and pinion of the cylinder lock. The partial perspective view explaining the arrangement | positioning relationship of each tumbler, pinion, swing gear, confirmation tumbler of the cylinder lock. Sectional drawing of the state which inserted the normal key in the cylinder lock. Sectional drawing of the state which inserted the conversion key in the cylinder lock. Cross-sectional view of the cylinder lock, (a) is a cross-sectional view showing the normal use state of the lock that can be locked and unlocked with a normal key, (b) is the reset state of the key code by inserting, rotating, and pulling out the conversion key. Sectional drawing shown, (c) is a sectional view showing the position of the pinion follower shaft and the cam follower shaft in the state of (b). 4A is a cross-sectional view of the cylinder lock, FIG. 4A is a cross-sectional view showing a state before the key code is converted, FIG. 4B is a cross-sectional view showing the key code in the middle of conversion, and FIG. Sectional drawing which shows the state set to the new key code after completion | finish. It is sectional drawing of the cylinder lock, (a) is sectional drawing which shows the position of a pinion follower axis | shaft and cam follower axis | shaft in the state of Fig.7 (a), (b) is a pinion follower axis | shaft and cam follower in the state of Fig.7 (b). Sectional drawing which shows the position of an axis | shaft, (c) is sectional drawing which shows the position of the pinion follower axis | shaft and cam follower axis | shaft in the state of FIG.7 (c). The rear view of the set state of 1st Embodiment of a cylinder lock. The rear view (a) which shows a mode that the outer cylinder, the retaining ring, the stopper board, and the connection cam were removed in the set state of 1st Embodiment, and the back view (b) which shows a mode that the connection nail | claw and the lead cam were further removed. The rear view (a) which shows a mode that the outer cylinder, the retaining ring, the stopper board, and the connection cam were removed in the reset state of 1st Embodiment, and the back view (b) which shows a mode that the connection nail | claw and the lead cam were further removed. The longitudinal cross-sectional view (a), (b), and (c) which shows the operation | movement aspect of the connection switching mechanism containing the connection nail | claw of 1st Embodiment. The rear view (a) and (b) of the set state which shows the example of the connection switching mechanism of 2nd Embodiment. The rear view (a) and (b) of the reset state which shows the example of the connection switching mechanism of 2nd Embodiment.

Explanation of symbols

K1 ... conversion key, K2 ... normal key, S ... compression coil spring, V ... stopper wall surface, 1 ... outer cylinder, 1a, 1b ... groove, 2 ... inner cylinder, 2a ... partition groove, 3 ... tumbler, 3a ... projection 3b ... tooth part, 3c ... arm part, 3d ... support shaft, 4 ... pinion, 4a ... recess, 5 ... swing plate, 6 ... side bar, 7 ... swing gear, 7a ... engaging claw part, 8 ... cam follower shaft , 9 ... Pinion follower shaft, 10 ... Lead cam, 10a, 10b ... Cam hole, 10x ... Engagement hole, 11 ... Spring pressing plate, 12 ... Confirmation tumbler, 12a ... Spring support projection, 12b ... Engagement projection, 13 ... Connection Claw, 13a ... front engaging portion, 13b ... rear engaging portion, 14 ... connecting cam, 14a ... engaging hole, 15 ... stopper plate, 15a ... opening, 15b, 15c ... rotation restricting portion, 16 ... retaining ring, 17 ... outer cylinder cap, 18 ... Kiga De

Claims (5)

An outer cylinder,
An inner cylinder including a plurality of movable tumblers and a code holding mechanism that holds a key code set by the plurality of tumblers;
A state switching member that switches between a set state in which the key code is held by the code holding mechanism and a reset state in which the key code can be changed according to a rotational position with respect to the inner cylinder;
A connection switching mechanism for switching the connection mode in the rotational direction between the outer cylinder, the inner cylinder and the state switching member;
Comprising
The connection switching mechanism makes the inner cylinder rotatable with respect to the outer cylinder when the conversion key is inserted, and fixes the state switching member to the outer cylinder. When the normal key is inserted, the connection switching mechanism is in the set state. A tumbler-type cylinder lock, wherein the inner cylinder and the state switching member are integrally rotatable with respect to the outer cylinder, and the inner cylinder and the state switching member are fixed to the outer cylinder in the reset state. . The connection switching mechanism includes a connection member configured to be directly or indirectly engageable with the outer cylinder, the inner cylinder, and the state switching member,
The connecting member is disposed so as to be movable along a key insertion direction between a front position engaged with the inner cylinder and a rear position engaged with the outer cylinder in a state where the urging force is always applied forward. The state switching member is configured to be always engaged,
At the time of inserting the conversion key, the connecting member is pressed by the conversion key and arranged at the rear position,
When the normal key is inserted, the connecting member is arranged at the front position by the biasing force in the set state, and the connecting member is held at an intermediate position between the front position and the rear position in the reset state. The tumbler-type cylinder lock according to claim 1, wherein the tumbler-type cylinder lock is engaged with both the outer cylinder and the inner cylinder. The inner cylinder is provided with an engagement structure that engages with the connecting member in the rotation direction in the set state and the reset state,
The engaging structure engages with the connecting member in the rotational direction in the set state and holds the connecting member at the front position, and engages with the connecting member in the rotational direction in the reset state and the connecting member. 3. The tumbler-type cylinder according to claim 2, wherein the tumbler-type cylinder is configured such that the cylinder is held in the intermediate position and is not engaged in the rotation direction when the connecting member is disposed in the rear position. Tablets.   The engaging structure is formed on a rear end surface of the inner cylinder formed at a position where the connecting member is not engaged in the rotation direction when the connecting member is disposed at the rear position, and in the set state, A first engaging recess that can be fitted, and a second engaging recess that is formed on the rear end surface and that can be fitted with the connecting member in the reset state and is shallower than the first engaging recess. The tumbler-type cylinder lock according to claim 3, wherein the tumbler-type cylinder lock is provided.   The engaging structure protrudes on the rear end surface of the inner cylinder at a height that does not engage in the rotation direction when the connecting member is disposed at the rear position, and is in the front position in the set state. A first engaging projection that engages with the connecting member in the rotational direction and holds the connecting member at the intermediate position in the reset state; and the rotational direction when the connecting member is disposed at the rear position. A second protruding from the rear end surface of the inner cylinder at a height that does not engage, and is engaged with the connecting member at the intermediate position in the reset state in the rotational direction, and is higher than the first engaging convex portion. The tumbler-type cylinder lock according to claim 3, further comprising an engaging convex portion.

Images