JP2006118211A - Locking/unlocking device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a locking/unlocking device enabling interlock of an indoor and outdoor cylinder lock without a clutch mechanism. <P>SOLUTION: The locking/unlocking device has a thumb-turn cylinder 11 protruding on the indoor side, a core shaft 13 connected to an input and output axis of a lock box, a plug 15 turned together with the core shaft 13 inside the thumb-turn cylinder 11 and making a tumbler protrude from an outer periphery, and an inner cylinder 17 provided irrotationally in the axial direction in the thumb-turn cylinder 11 and fitted to the tumbler and relatively irrotationally fitted to the thumb-turn cylinder 11 at a moving position on one side in the axial direction. The locking/unlocking device has an opening/closing leg 19 provided in the core shaft 13 and turned together with the core shaft 13 and moving the inner cylinder 17 from one side in the axial direction to the other side in the axial direction through a protrusion and a detachable/attachable thumb-turn key 21 inserted into a keyhole of the plug 15 and making the opening/closing leg 19 open and releasing engagement of the opening/closing leg 19 and the inner cylinder 17. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a locking / unlocking device suitably used for an opening / closing body such as a door or a sliding door, and more specifically, a locking / unlocking device provided on an indoor side opposite to a cylinder lock and a lock box provided on the outdoor side of the door. The present invention relates to a locking device.

  A cylinder lock is generally provided on the outdoor surface of the entrance door, and by inserting a key from the outdoor side into this cylinder lock and turning it, the locking and unlocking mechanism of the lock box built in the door is activated, The door can be locked and unlocked by moving the lock bolt from the door to the door frame. On the other hand, a thumb turn is provided on the indoor side of the entrance door, and the thumb turn is picked from the indoor side and rotated to input the locking / unlocking operation force to the lock box inside the door, making it easy to lock and unlock the door. To be able to.

  However, in recent years, the thumb turn is rotated by inserting a wire or a rod-like tool from a small window of the door provided for the purpose of improving elegance or daylighting, a peephole for confirmation, or a mailbox provided in the door etc. However, crimes such as so-called thumb turn that unlocks the door illegally occur frequently.

  In order to prevent such illegal acts and improve crime prevention, a locking / unlocking device in which cylinder locks are provided on both indoor and outdoor sides of a door has been proposed. In this locking / unlocking device, both cylinder locks are mechanically connected to the lock box, and locking / unlocking using the lock box is possible by operating one of the cylinder locks.

  And in the locking / unlocking operation by this type of locking / unlocking device, the lock is unlocked by inserting a key from the outdoor side when going out and returning home, as in a general locking device. On the other hand, a lock key is normally attached to the cylinder lock on the indoor side, and this lock key is removed when necessary, for example, at bedtime or when going out. Thus, when the user goes out, the door is locked from the outdoor side, so that even if the glass window or the like is broken, the thumb turn does not exist on the indoor side, so that unauthorized unlocking by turning the thumb turn becomes impossible. Even at bedtime, the inner key is turned, the door is locked, and the indoor key (thum turn) is removed, so that even if the glass window is broken, the thumb turn Unauthorized unlocking by turning is disabled.

By the way, the cylinder lock incorporates a plurality of tumblers, and by inserting a mating key, the shear lines of all the tumblers are aligned on a straight line so that the mating key insertion cylinder (hereinafter also referred to as “plug”) can be rotated. (That is, it can be locked and unlocked). Therefore, in the state where the key is not inserted, the shear line of the tumbler does not match and the plug cannot be rotated. For this reason, if the plug for the cylinder lock inside and outside is simply connected directly to the input / output shaft of the lock box, the plug in which the cylinder lock cannot be rotated when either of the mating keys is removed. This makes the other cylinder lock unrotatable.
For this reason, in the conventional locking / unlocking device described above, the clutch mechanism is interposed between the lock box and the cylinder lock so that the clutch mechanism can be operated even when the key is not inserted into one of the cylinder locks. Operates and is not constrained by the non-rotatable state of one of the cylinder locks, and the other cylinder lock is freely rotatable, and can be locked and unlocked even in the case of a lock / unlock device that has cylinder locks on both the indoor and outdoor sides. It was supposed to become.
However, in the structure provided with such a clutch mechanism, the interlocking between the two cylinder locks provided indoors and outdoors is canceled by the clutch mechanism, so that both the cylinder locks indoors and outdoors do not rotate together. For this reason, for example, when the lock key inserted into the cylinder lock on the outdoor side is rotated with the lock key removed from the cylinder lock on the indoor side, the rotation is not transmitted to the cylinder lock on the indoor side by the clutch mechanism. As a result, the lock / unlock state of the lock box could not be judged from the cylinder lock on the indoor side, and there was a problem of poor operability. In addition, in the locking / unlocking device provided with the clutch mechanism, the structure becomes complicated, the entire device becomes large, and the number of parts increases, resulting in an increase in device cost. Further, when the clutch mechanism is simply interposed between the cylinder lock and the lock box, there is a disadvantage that the length of the locking / unlocking device in the axial direction becomes long.

  The present invention has been made in view of the above situation, and it is possible to lock and unlock the lock box while interlocking with the rotation operation of the other cylinder lock, without providing the clutch mechanism. It is an object of the present invention to provide a locking / unlocking device that can reduce costs, improve operability, and shorten the length in the axial direction of the device.

Next, means for solving the above problems will be described with reference to the drawings corresponding to the embodiments.
The locking / unlocking device 100 according to claim 1 of the present invention is a locking / unlocking device 100 provided on an indoor side opposite to a cylinder lock and a lock box provided on the outdoor side of a door,
A thumb turn cylinder 11 which is fixed to at least one of the door or the lock box and protrudes indoors;
A core shaft 13 connected to the input / output shaft of the lock box in a relatively non-rotatable manner;
A plug 15 having a substantially rectangular keyhole 45 and protruding from the outer periphery of tumblers 47a to 47c that are pivotally coupled and biased integrally with the core shaft 13 inside the thumb turn cylinder 11;
The thumb-turn cylinder 11 is rotatably and axially movable, and is engaged with the tumblers 47a to 47c projecting from the outer periphery of the plug 15. The thumb-turn cylinder 11 cannot rotate relative to the thumb-turn cylinder 11 at one axial position. An inner cylinder 17 that is locked to
The inner cylinder 17 is axially connected to the inner cylinder 17 via a convex portion 81 provided in the core shaft 13 and rotated integrally with the core shaft 13 by the rotational force from the lock box and engaged with the inner cylinder 17 in the open leg state. An opening / closing leg 19 that moves in the other direction to release the engagement between the inner cylinder 17 and the thumb turn cylinder 11;
The tumblers 47a to 47c projected from the outer periphery by being inserted into the keyhole 45 of the plug 15 are retracted to the non-projecting state and the opening / closing leg 19 is closed to engage the opening / closing leg 19 with the inner cylinder 17. And a demountable thumb turn key 21 for releasing the combination.

  In this locking / unlocking device 100, for example, when the demounting thumb turn key 21 is removed from the cylinder on the indoor side and the mating key is inserted into the cylinder lock on the outdoor side, this rotational operation force is applied to the lock box. It is transmitted to the core shaft 13 via the input / output shaft. When the core shaft 13 is rotated, the inner cylinder 17 is moved from one axial direction to the other via the opening / closing leg 19, and the engagement between the inner cylinder 17 and the thumb turn cylinder 11 is released. As a result, the core shaft 13, the plug 15, and the inner cylinder 17 can be rotated together. Therefore, the cylinder lock on the outdoor side can be rotated while the indoor locking / unlocking device 100 is driven. The indoor side locking / unlocking device 100 can be rotated even when the lock is unlocked from the outdoor side cylinder lock in the same manner as the locking / unlocking operation by the mechanism in the lock box which has been performed by the conventional thumb turn operation. Operation becomes possible.

  The locking / unlocking device 100 according to claim 2 is characterized in that the detachable thumb turn key 21 is the same as a cylinder lock key on the outdoor side.

  In this locking / unlocking device 100, the detachable thumb turn key 21 is normally attached to the indoor locking / unlocking device 100. For example, when the user is out of the room, the detachable thumb turn key 21 is removed from the indoor locking / unlocking device 100. The cylinder lock on the outdoor side can be locked and removed when the desorption thumb turn key 21 is detached. In other words, one removable thumb turn key 21 is used efficiently, and security is secured simultaneously with locking.

  According to the locking / unlocking device according to claim 1 of the present invention, even when the removable thumb turn key is removed, if the mating key is inserted into the outdoor cylinder lock and rotated, Is transmitted to the core shaft via the input / output shaft of the lock box, and the open / close leg rotates integrally with the core shaft, so that the inner cylinder moves from one axial direction to the other via the convex portion of the open / close leg. Let the inner cylinder and thumb turn cylinder be unlocked. Therefore, the indoor locking / unlocking device can be rotated by being driven by the outdoor cylinder lock. Accordingly, the lock box can be locked and unlocked while interlocking the rotation operation of the cylinder lock on the outdoor side without providing the clutch mechanism. As a result, it is possible to simultaneously reduce the cost of the locking / unlocking device, improve the operability, and shorten the length in the device axial direction.

  According to the locking / unlocking device of the second aspect, since the removable thumb turn key is the same as the cylinder lock key on the outdoor side, the security is ensured simultaneously with the locking with a single key and the operability is improved. Can be made.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, a preferred embodiment of a locking and unlocking apparatus according to the invention will be described in detail with reference to the drawings.
FIG. 1 is a configuration diagram showing a longitudinal sectional view of a locking / unlocking device according to the present invention with a key in (a) and a lateral sectional view thereof in (b), and FIG. 2 is a keyless state of the locking / unlocking device according to the present invention. FIG. 3 is a configuration diagram showing a longitudinal sectional view of FIG. 3A and FIG. 3B is an exploded longitudinal sectional view of the locking / unlocking device according to the present invention. FIG. 4 is an exploded cross-sectional view of the locking / unlocking device according to the present invention. FIG. 5 is an exploded perspective view of the thumb turn cylinder, the inner cylinder, the plug and the vicinity thereof, and FIG. 6 is an exploded perspective view of the core shaft, the open / close leg and the vicinity thereof.

  The locking / unlocking device 100 according to the present embodiment is provided on the indoor side opposite to a cylinder lock and a lock box provided on the outdoor side of the door. That is, the locking / unlocking device 100 can also be called an indoor cylinder lock. Moreover, the locking / unlocking device according to the present invention may be provided on the opposite side to the present embodiment, that is, on the outdoor side. In this case, a normal cylinder lock may be provided on the indoor side. Furthermore, the locking / unlocking device 100 and the outdoor-side cylinder lock may be either those that share the same key or those that use different keys. In the present embodiment, the locking / unlocking device 100 and the outdoor-side cylinder lock use the same key (detaching thumb turn key 21). For convenience of explanation, the two spaces sandwiching the door are referred to as indoor and outdoor, but the two spaces may of course be two indoor spaces such as indoor or outdoor or a partition door.

  A door (not shown) to which the locking / unlocking device 100 according to the present embodiment is attached is provided with a lock box. The lock box is provided with a latch bolt, a dead bolt, and a lock box mechanism for moving these back and forth from the door's mouth. Yes. The dead bolt of the lock box is obtained by rotating the outdoor side cylinder lock provided on the outdoor side surface of the door with a lock key or rotating the locking / unlocking device 100 provided on the indoor side surface of the door with a demounting thumb turn key. It is possible to advance and retreat from the mouth of the door.

  The locking / unlocking device 100 according to the present embodiment includes a thumb turn cylinder 11, a core shaft 13, a plug 15, an inner cylinder 17, an opening / closing leg 19, and a removable thumb turn key 21 as main components. .

  The thumb turn cylinder 11 has an accommodating space 23 penetrating in the axial direction inside, and a pair of fixed screw insertion holes 25, 25 are penetrated in the axial direction across the accommodating space 23. On the indoor side of the thumb turn cylinder 11, a pair of vertical holes 27 are formed so as to penetrate the accommodation space 23 in the direction orthogonal to the axis. A push ball 29, a click spring 31, and a pressing piece 33 are sequentially inserted into the vertical holes 27, 27, respectively. The push ball 29 is prevented from jumping out by the small diameter portion 35 inside the vertical hole 27. The pressing piece 33 is restricted from popping out by a decorative cylinder 37 or the like attached to the outer periphery of the thumb turn cylinder 11. Therefore, a part of the push ball 29 protrudes into the accommodation space 23 so as to be retractable by the urging force of the click spring 31.

  The thumb turn cylinder 11 is screwed into a lock box (not shown) by a pair of fixing bolts from the indoor side in a state where the decorative cylinder 37 is attached to the outer periphery. The decorative cylinder 37 and the thumb turn cylinder 11 are provided with opening holes 39a and 39b for opening the accommodation space 23 to the indoor side, respectively, and the removable thumb turn key 21 enters the opening holes 39a and 39b. A circumferential groove 41 is formed in the picking base of the demounting thumb turn key 21, and the demounting thumb turn key 21 is inserted into the opening holes 39a and 39b so that the push ball 29 is inserted into the circumferential groove 41 and inserted and removed while generating a click feeling. In other words, at the time of insertion, it is supported by the push ball 29 so as to be rotatable.

  Inside the thumb turn cylinder 11, a seating surface parallel to the axis orthogonal surface is formed, and on this seating surface, there are four trapezoidal protrusions 43, 43, protruding to the lock box side with an interval of 90 ° in the circumferential direction. 43, 43 are provided.

  A core shaft 13 is rotatably provided in the thumbturn cylinder 11, and the core shaft 13 is connected to an input / output shaft of a lock box (not shown) so as not to be relatively rotatable. In the accommodation space 23 of the thumb turn cylinder 11, a plug 15 is accommodated on the indoor side of the core shaft 13, and one end face of the plug 15 is exposed to the above-described opening holes 39a and 39b. A substantially rectangular key hole 45 into which the detachable thumb turn key 21 is inserted is opened at one end face of the plug 15 exposed in the opening holes 39a and 39b.

  A plurality of tumblers 47a, 47b, and 47c in the present embodiment are built in the plug 15 so as to be movable in the diameter direction. Each of the tumblers 47a to 47c is provided with a protrusion 49 orthogonal to the moving direction. The tumblers 47a to 47c protrude outward in the radial direction of the plug 15 when the protrusion 49 is urged by the coil spring 51.

  An engagement ring 53 is interposed between the plug 15 and the core shaft 13. The engagement ring 53 is formed with cutouts 55 and 55 formed on the inner diameter and on both sides in the diameter direction, and the tip of the removable thumb turn key 21 is inserted into the cutouts 55 and 55. Further, a pair of convex pieces 57, 57 projecting outward in the diameter direction are provided on the outer periphery of the engagement ring 53, and the convex pieces 57, 57 are a pair of notches 59 formed on the rear end face of the core shaft 13. 59. That is, the detachable thumb turn key 21 inserted from the key hole 45 of the plug 15 enters the notches 59 and 59 of the engagement ring 53 at the tip of the key, and the core shaft passes through the engagement ring 53 by the rotation operation of the detachment thumb turn key 21. 13 can be rotated.

  The inner cylinder 17 is installed in the thumb turn cylinder 11 so as to be rotatable and movable in the axial direction. A trapezoidal notch 61 is formed on the rear end side of the inner cylinder 17 at intervals of 90 ° in the circumferential direction. The trapezoidal notch 61 engages with the trapezoidal protrusion 43 of the thumb turn cylinder 11 to rotate the inner cylinder 17. Work to stop. That is, the inner cylinder 17 is locked to the thumb turn cylinder 11 so as not to be relatively rotatable at one position in the axial direction (indoor direction). The inner cylinder 17 is provided with engagement holes 63 for engaging the tumblers 47a to 47c protruding from the outer periphery of the plug 15 at intervals of 90 ° in the circumferential direction. The inner cylinder 17 is formed with a base plate-shaped (substantially pentagonal) engagement hole 65 having a pair of oblique sides 65a, 65b at intervals of 90 ° in the circumferential direction.

  The core shaft 13 is provided with an opening / closing leg 19 comprising a pair of leg members 19a, 19b in an opening / closing leg receiving recess 67, and the opening / closing leg 19 is rotated integrally with the core shaft 13, for example, rotated integrally by a rotational force from a lock box. It becomes. An axial pin accommodation hole 69 is formed in the core shaft 13. A push pin 71, an urging spring 73, and a retaining pin 75 are sequentially inserted into the pin accommodation hole 69, and the urging pin 71 and the urging spring 73 are inserted. The inner ends 80 and 80 of the leg members 19a and 19b are interposed between the leg members 19a and 19b. Inner ends 80, 80 of the leg members 19a, 19b are each formed in a substantially hemispherical shape and overlapped in the width direction, and are positioned between the push pin 71 and the biasing spring 73. The retaining pin 75 is retained by a fixing pin 77 that is inserted into the core shaft 13 in the diameter direction.

  The push pin 71 and the inner end 80 of the opening / closing leg 19 are urged to the indoor side (left side in FIGS. 1 and 6) by the urging force of the urging spring 73. The open / close leg 19 whose inner end 80 is urged indoors together with the push pin 71 is swung via a swing shaft 79, and the convex portions 81, 81 as outer ends are formed in the engagement hole 65 of the inner cylinder 17. enter in. The open / close leg 19 normally has the inner ends 80, 80 biased to the indoor side, so that the outer end convex portions 81, 81 enter the engagement hole 65 of the inner cylinder 17. When the thumb turn key 21 is inserted, the push pin 71 is pushed by the tip of the key, and the inner ends 80 and 80 are pushed against the urging force of the urging spring 73 via the push pin 71, As a result, the protrusions 81 and 81 are disengaged from the engagement hole 65. Further, when the core shaft 13 is rotated by the rotation from the lock box side, the convex portions 81 and 81 projecting from the core shaft 13 press the oblique sides 65a and 65b of the engagement hole 65. As a result, the inner cylinder 17 is moved from one axial direction to the other axial direction (lock box side), and the engagement between the inner cylinder 17 and the thumb turn cylinder 11 is released.

  Thus, the plug 15, the engagement ring 53, and the core shaft 13 are inserted into the thumb turn cylinder 11 from the indoor side, and the inner cylinder 17 is interposed between these and the thumb turn cylinder 11. That is, it is configured in a double cylinder shape. An inner cylinder washer 83 and a push spring 85 are inserted from the opening on the lock box side of the thumb turn cylinder 11, and the push spring 85 is prevented from falling off by a bottom plate 87 fixed to the lock box side opening of the thumb turn cylinder 11. The inner cylinder washer 83 is pressed against a plurality of protrusions 89 provided on the outer periphery of the inner cylinder 17. That is, the inner cylinder 17 is urged to one side (indoor side) in the axial direction by the push spring 85, and the rotation is restricted by the trapezoidal protrusion 43 and the trapezoidal notch 61 being engaged.

Next, the operation of the locking / unlocking apparatus 100 having the above configuration will be described.
FIG. 7 is an operation explanatory view of the locking / unlocking device according to the present invention in a vertical sectional view of the keyless state (a) and a horizontal sectional view of FIG. 8 (b), and FIG. 8 is a sectional view of the plug in the keyless state (a). ), An operation explanatory diagram showing the cross-sectional view of the plug with the key in FIG. 9B, FIG. 9 is an operation explanatory diagram at the time of rotation input from the outdoor side cylinder without the key, and FIG. 10 is the inner cylinder shown in FIG. It is operation | movement explanatory development view which represented the engagement cancellation | release process with the thumb-turn cylinder of (a)-(c).
In the normal state, the locking / unlocking device 100 has the removable thumb turn key 21 inserted into the plug 15 as shown in FIG. In this state, as shown in FIG. 8 (b), since the removable thumb turn key 21 is a regular key, the tumblers 47a to 47c are all retracted into the plug 15 by the key edge shape (mountain valley shape). The engagement with the inner cylinder 17 is released. Further, the tip of the detachable thumb turn key 21 presses the inner end 80 of the opening / closing leg 19 against the urging force of the urging spring 73 via the push pin 71, and as shown in FIG. The projection 81 is retracted to release the engagement between the opening / closing leg 19 and the inner cylinder 17. As a result, the removable thumb turn key 21 functions as a conventional thumb turn.

  Therefore, on the outdoor side, the lock box can be locked and unlocked by inserting a matching key into the outdoor cylinder lock. At this time, the removable thumb turn key 21 inserted into the locking / unlocking device 100 also rotates in conjunction with the core shaft 13 and the engagement ring 53. Also, from the indoor side, by rotating the demountable thumb turn key 21, it is possible to perform unlocking and unlocking operations using a lock box regardless of whether or not a matching key is inserted in the outdoor side cylinder lock as in the case of conventional thumb turns. It becomes. The demountable thumb turn key 21 can be easily rotated without easily falling off because the push ball 29 is engaged with the circumferential groove 41.

  On the other hand, as shown in FIG. 7, when the removable thumb turn key 21 is removed from the locking / unlocking device 100 when going out, the tumblers 47a to 47c project from the plug 15 as shown in FIG. Engage with the 17 engagement holes 63. That is, relative rotation between the plug 15 and the inner cylinder 17 becomes impossible. In a state where the removable thumb turn key 21 is inserted into the outdoor side cylinder lock, when the removable thumb turn key 21 is rotated from the outdoor side, as shown in FIG. 9, this rotational operation force is transmitted via the input / output shaft of the lock box. Is transmitted to the core shaft 13.

  When the core shaft 13 is rotated, as shown in FIG. 10A, the convex portion 81 of the opening / closing leg 19 presses the oblique side 65b of the engagement hole 65, and as a result, the inner cylinder 17 is moved to the lock box side (see FIG. 10 to the right). As a result, as shown in FIG. 10B, the engagement between the trapezoidal protrusion 43 of the thumb-turn cylinder 11 and the trapezoidal notch 61 of the inner cylinder 17 is released, and the core shaft 13 is further rotated. As shown in FIG. 10 (c), the inner cylinder 17 rotates integrally with the plug 15 and the core shaft 13. Therefore, the cylinder lock on the outdoor side can be rotated while the indoor locking / unlocking device 100 is driven.

  As described above, according to the locking / unlocking device 100 described above, even when the removable thumb turn key 21 is removed, if the key is inserted into the outdoor cylinder lock and rotated, the rotational operation force is reduced. It is transmitted to the core shaft 13 via the input / output shaft of the lock box, and the opening / closing leg 19 rotates together with the core shaft 13, so that the inner cylinder 17 is axially moved through the convex portion 81 of the opening / closing leg 19. Move from one side to the other in the axial direction (lock box side) to release the engagement between the inner cylinder 17 and the thumb turn cylinder 11.

  In the locking / unlocking device 100, since the rectangular keyhole 45 rotates with the interlocking plug 15, the locking / unlocking state of the lock box can be easily known by visually observing the rotation posture of the keyhole 45. Accordingly, the lock box can be locked and unlocked while interlocking with the rotation operation of the cylinder lock on the outdoor side without providing the clutch mechanism. As a result, the cost of the locking / unlocking device can be reduced and the operability can be improved, and the thumb-turn cylinder 11 and the inner cylinder 17 and the inner cylinder 17 and the plug 15 are configured as a substantially double cylinder structure. Shortening of length can be achieved at the same time.

  Further, by making the removable thumb turn key 21 the same as the cylinder lock key on the outdoor side, it is possible to secure crime prevention simultaneously with locking with a single key and improve operability.

It is the block diagram which represented the longitudinal cross-sectional view of the state with a key of the locking / unlocking apparatus which concerns on this invention to (a), and represents the cross-sectional view to (b). It is the block diagram which represented (a) and the front view to (b) the longitudinal cross-sectional view of the keyless state of the locking / unlocking apparatus which concerns on this invention. It is a decomposition | disassembly longitudinal cross-sectional view of the locking / unlocking apparatus which concerns on this invention. It is a decomposition | disassembly cross-sectional view of the locking / unlocking apparatus which concerns on this invention. It is a disassembled perspective view of a thumb turn cylinder, an inner cylinder, a plug, and its vicinity. It is a disassembled perspective view of a core axis | shaft, an opening-and-closing leg, and its vicinity. It is operation | movement explanatory drawing which represented the longitudinal cross-sectional view of the keyless state of the locking / unlocking apparatus which concerns on this invention to (a), and represented the cross-sectional view to (b). FIG. 6 is an operation explanatory view showing a plug cross-sectional view in a state without a key in (a) and a plug cross-sectional view in a state with a key in (b). It is operation | movement explanatory drawing at the time of the rotation input from the outdoor side cylinder in a keyless state. FIG. 10 is an operation explanatory development view in which the disengagement process of the inner cylinder shown in FIG. 9 with the thumb turn cylinder is represented by (a) to (c).

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 ... Thumb turn cylinder 13 ... Core shaft 15 ... Plug 17 ... Inner cylinder 19 ... Opening / closing leg 21 ... Desorption thumb turn key 45 ... Keyhole 47a-47c ... Tumbler 81 ... Convex part 100 ... Locking and unlocking device

Claims (2)

A locking / unlocking device provided on the indoor side opposite the cylinder lock and lock box provided on the outdoor side of the door,
A thumb turn cylinder which is fixed to at least one of the door or the lock box and protrudes indoors;
A core shaft connected to the input / output shaft of the lock box in a relatively non-rotatable manner;
A plug having a substantially rectangular key hole and projecting from the outer periphery of a tumbler which is integrally connected to the core shaft and urged to rotate inside the thumb turn cylinder;
An inner cylinder which is installed in the thumb turn cylinder so as to be rotatable and movable in the axial direction, engages with the tumbler protruding from the outer periphery of the plug, and engages with the thumb turn cylinder in a relatively non-rotatable manner at one movement position in the axial direction. When,
The inner cylinder is moved to the other in the axial direction through a convex portion which is provided in the core shaft and is rotated integrally with the core shaft by the rotational force from the lock box and engaged with the inner cylinder in the open leg state. An opening and closing leg for releasing the engagement between the inner cylinder and the thumb turn cylinder,
A detachable thumb turn key for releasing the engagement between the opening / closing leg and the inner cylinder by retracting the tumbler protruding from the outer periphery by being inserted into the key hole of the plug into a non-projecting state and closing the opening / closing leg; And a locking / unlocking device.   2. The locking / unlocking device according to claim 1, wherein the demounting thumb turn key is the same as a cylinder lock key on the outdoor side.

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