JP4460425B2 - Security thumb turn - Google Patents

Description

  The present invention relates to a crime prevention thumb turn that prevents an unauthorized input of an unlocking operation force from being applied to a lock box by restricting rotation of a knob protruded from an indoor surface of a door.

  A lock box is provided at the entrance door provided in an apartment, a house, etc., and the lock box has a locking / unlocking mechanism that locks / unlocks the door by engaging / disengaging the dead bolt that has been advanced / retracted from / from the door mouth. Built-in. The lock box is locked and unlocked by inputting a locking / unlocking operation force by a cylinder lock from the outdoor side or a thumb-turning / unlocking operation force by a thumb turn from the indoor side. That is, the operation by the key lock of the cylinder lock is required from the outdoor side, while the lock operation can be easily performed by the rotation operation of only the knob without using the key lock from the indoor side.

  This type of thumb turn has a plate-like knob that protrudes perpendicularly to the indoor surface side of the door, as disclosed in Patent Document 1 below. This knob is connected to the locking / unlocking mechanism of the lock box via the thumb turn shaft. Therefore, from the indoor side, by picking this knob with a finger and rotating it forward and backward, the rotational operation force is transmitted directly to the lock box via the thumb turn shaft, and the dead bolt is advanced and retracted by the locking / unlocking mechanism. Can be locked and unlocked.

  However, in recent years, there has been an increase in unauthorized unlocking that unlocks locking devices by inserting a rod or wire from a small hole opened by a post port or a machine tool, locking it to a thumb turn that is easy to rotate, and rotating it. Yes.

For example, there is a button-press type crime prevention thumb turn that prevents the thumb turn from being locked and rotated. This button-pressing type security thumb turn has a pushable button protruding on a flat knob, and when this button is pressed, the rotation control of the knob is released and the locking / unlocking operation force for the locking / unlocking mechanism of the lock box is released. Can be input. Therefore, in order to turn the knob, it must be rotated while pressing the button, and it is difficult to perform unauthorized unlocking (so-called thumb turn) by inserting an unauthorized jig such as a wire or a rod into the door indoor side. It was possible to improve crime prevention.
Japanese Patent Publication No. 2-157715 (Fig. 1b, Fig. 1c)

  However, in the conventional button-pressing type crime prevention thumb turn described above, when the turning force is applied to the thumb turn at the same time as the button is pushed, the button may remain pressed due to play of the internal mechanism. This is the same phenomenon as when picking is performed. Therefore, in anticipation that such a phenomenon may occur, even if it is a button-pressing type crime prevention thumb turn with two front and back buttons, for example, the button on one side is pressed with a stick etc. By applying turning force, one button is held in a pressed state, and then the thumb turn is improperly unlocked by applying rotational force to the thumb turn while pressing the button on the other side with a stick or the like. I was worried.

  The present invention has been made in view of the above situation, and provides a crime prevention thumb turn in which a button is not held in a pressed state in a button press type crime prevention thumb turn, thereby further improving the crime prevention performance against the thumb turn. With the goal

Next, means for solving the above problems will be described with reference to the drawings corresponding to the embodiments.
The crime prevention thumb turn 100 according to claim 1 of the present invention is a crime prevention thumb turn 100 in which buttons 63 and 65 for releasing the rotation restriction by pressing are provided on the knob 41.
The pressing protrusions 64 of the buttons 63 and 65 are arranged eccentrically with respect to the rotation center 111 so that the pressing force 103 in the direction opposite to the moment 101 in the unlocking direction of the knob 41 is required. Features.

  In this security thumb turn 100, the direction in which the buttons 63 and 65 are pushed in and the direction in which the knob 41 is rotated are opposite directions, for example, the opposite direction across the rotation center 111, and when the buttons 63 and 65 being picked are pushed in. At the same time, turning force is applied to the knob 41 so that the buttons 63 and 65 cannot be held in a pressed state.

  The crime prevention thumb turn 100 according to claim 2 is characterized in that a pair of the buttons 63 and 65 are provided across the rotation center 111 of the knob 41.

  In this security thumb turn 100, there are two buttons 63 and 65 that require a pressing force 103 in the opposite direction to the moment 101 in the unlocking direction, and it becomes more difficult to hold the buttons 63 and 65 in the pressed state.

  The crime prevention thumb turn 100 according to claim 3 is characterized in that the rotation restriction is released by simultaneously pressing the pair of buttons 63 and 65.

  In the security thumb turn 100, the moment 101 in the unlocking direction and the pressing force 103 in the opposite direction must be applied to the knob simultaneously from two directions.

  According to the crime prevention thumb turn of the first aspect of the present invention, in the crime prevention thumb turn in which the button for releasing the rotation restriction by pressing is provided on the knob, a pressing force in the direction opposite to the moment in the unlocking direction of the knob is required. In this way, the push protrusion of the button is arranged eccentrically with respect to the center of rotation, so at the same time as the button is pushed in, the turning force is applied to the knob and the button remains in the pressed state due to play of the internal mechanism, By applying a rotational force to the knob, an illegal act of unlocking the knob can be prevented. As a result, the crime prevention property of the button press type crime prevention thumb turn can be further improved.

  According to the crime prevention thumb turn of claim 2, since the pair of buttons are provided across the rotation center of the knob, there are two buttons that require a pressing force in the opposite direction to the moment in the unlocking direction, and the button is pressed. It becomes more difficult to maintain the state, and the crime prevention property of the button press type crime prevention thumb turn can be further improved.

  According to the crime prevention thumb turn according to claim 3, since the rotation restriction is released by pressing the pair of buttons simultaneously, the moment in the unlocking direction and the pressing force in the opposite direction are picked from two directions at the same time. In addition, it is possible to make it extremely difficult to illegally press a button using a bar or a wire.

Hereinafter, a preferred embodiment of a security thumb turn according to the present invention will be described in detail with reference to the drawings.
1 is a perspective view of a security thumb turn according to the present invention attached to a lock box, FIG. 2 is a longitudinal sectional view of the security thumb turn according to the present invention, FIG. 3 is a horizontal sectional view of a security thumb turn according to the present invention, and FIG. 2 is an exploded view of the security thumb turn shown in FIG. 2, FIG. 5 is a front view of the knob shown in FIG. 3, FIG. 6 is an exploded perspective view of the knob shown in FIG. 5, and FIG. 7 is a button unit of the knob shown in FIG. FIG.

  A lock box 1 shown in FIG. 1 is provided on a door (not shown) to which a security thumb turn 100 according to the present embodiment is attached. The lock box 1 includes a latch bolt, a dead bolt 3, and a lock box mechanism (not shown) that moves these back and forth from a decorative plate 5 provided at the mouth of the door. The deadbolt 3 of the lock box 1 is a thumb-turn knob (hereinafter simply referred to as a “knob”) provided on a cylinder lock provided on the outdoor side surface of the door with a key (key) or on the indoor side surface of the door. It is possible to advance and retreat from the mouth of the door by rotating the door. The security thumb turn 100 is operated to enable or disable the picking operation by the following configuration.

  A fixed cylinder 21 shown in FIG. 2 is fixed to the door or lock box 1. A pair of fixing portions 23, 23 project from the outer periphery of the fixing cylinder 21 at one end in the axial direction, and the fixing portions 23, 23 have fixing holes 25. The fixed cylinder 21 is fixed to the lock box 1 provided in the door through the fixing hole 25.

  A spacer ring 26 is extrapolated at the tip of the fixed cylinder 21. A decorative cylinder 29 having a central hole 27 is placed on and fixed to the outer periphery of the spacer ring 26. A conical decorative ring 31 with a flat tip is externally mounted on the outer peripheral side tip of the decorative tube 29. The rear end of the decorative ring 31 is pressed against the indoor surface Ds of the door by the urging force of the spring 33 disposed between the bent portion 31a at the rear end and the rear end surface of the decorative tube 29.

  A core shaft 35 is rotatably provided inside the fixed cylinder 21, and the core shaft 35 has a rear portion connected to an input / output shaft (not shown) from the lock box 1. The core shaft 35 has a pressing ring 36 sandwiched on the lock box side, and the pressing ring 36 is detached from the fixed cylinder 21 by a fixing ring 37 that is engaged with a circumferential groove 21 a formed on the inner periphery of the fixed cylinder 21. Is prevented. The core shaft 35 has a protruding plate 39 protruding from the tip surface. Therefore, when the input / output shaft (not shown) of the lock box 1 is rotated, the protruding plate 39 is rotated.

  A thumb turn cylinder 43 is rotatably provided inside the rear end side of the fixed cylinder 21. In addition, a knob rod 38 to which a knob 41 is attached is rotatably provided inside the distal end side of the fixed cylinder 21. The knob 38 rotates in conjunction with the thumb turn cylinder 43 while allowing a predetermined play angle. A pair of stopper retracting recesses 38a are formed at both ends in the diameter direction on the outer periphery of the knob rod 38. The stopper retracting recesses 38a allow a stopper to be described later to enter and move in a direction in which the stopper is disengaged.

  The knob 41 is formed in a plate shape whose contour shape is a semicircular curve as shown in FIG. 3, for example. Thereby, even if it tries to hook the wire to the knob 41 or to push it with a rod, the wire or the rod is easily slipped because there is no corner portion, and it is difficult to apply these unauthorized rotational operation forces. In addition, since the corner portion is eliminated, the fit feeling with fingers is also improved.

  As shown in FIG. 4, the knob 41 is formed by fitting the upper case 42 and the lower case 44, and screwing the screws 50, 50 into female screws 48, 48 respectively formed on the pair of fixing hooks 46, 46 of the knob 38. Fixed. Locking portions 52, 52 (see FIG. 3) are formed at the left and right ends of the rear portion of the upper case 42. A U-shaped screw cover / rotation direction visualizing means 54 shown in FIGS. 5 and 6 is mounted on the outer periphery of the fitted upper case 42 and lower case 44. The screw cover / rotation direction visualizing means 54 is mounted by locking the locking claws 54a, 54a at both ends to the locking portions 52, 52. The knob 41 attached to the knob 38 is plate-shaped and protrudes from the central hole 27 of the decorative cylinder 29 to the indoor side. Accordingly, the knob 41 can easily grasp the posture rotated in the horizontal and vertical directions.

  The rear part of the thumb turn cylinder 43 is a cylindrical part 45, and the cylindrical part 45 is formed with notches 47 (see FIG. 4) opened at both ends in the diameter direction. A pair of shafts 45 a and 45 a that support a later-described sandwiching plate project from the rear end surface of the cylindrical portion 45 toward the lock box 1. A pair of stoppers 49 and 51 that are slidable in the direction orthogonal to the axis of the cylindrical portion 45 are provided inside the cylindrical portion 45. The stopper 49 is formed with a leg engaging portion 49a and a release surface 49b shown in FIG. Further, the stopper 51 is formed with a leg engaging portion 51a and a release surface 51b. Further, the stoppers 49 and 51 are provided with engaging portions 49c and 51c positioned on the radially outer side of the thumb turn cylinder 43, and the engaging portions 49c and 51c can enter the stopper retracting recesses 38a and 38a. ing.

  The pair of stoppers 49 and 51 are slid outward in the radial direction of the tubular portion 45 by engaging leg portions provided on a button described later with the leg engaging portions 49a and 51a. It protrudes and engages with an engaging groove 55 formed in the fixed cylinder 21. When the stoppers 49 and 51 are engaged with the engaging grooves 55, the thumb turn cylinder 43 cannot be rotated. Further, the stoppers 49 and 51 are slid inward in the radial direction so that the engaging portions 49c and 51c come out of the engaging groove 55 and enter the stopper retracting recess 38a so that the engagement is released. It has become.

  A button unit 57 shown in FIG. 6 is provided inside the knob 41. As shown in FIG. 7, the button unit 57 includes a pair of buttons 63 and 65, a support plate 56, and support pins 58 and 58 that rotatably support the buttons 63 and 65 on the support plate 56. The buttons 63 and 65 are formed in a substantially prismatic shape extending in a direction orthogonal to the rotation axis of the thumb turn cylinder 43 and have a groove 60 along the extending direction. The groove 60 is inserted into the support plate 56 and supported. Assembling is performed by inserting the pins 58 and 58 into the support holes 62 and 62 of the support plate 56.

  The upper case 42 and the lower case 44 are provided with rectangular button accommodation holes 59, and the buttons 63 and 65 are partially exposed from the button accommodation holes 59. The buttons 63 and 65 exposed from the button housing hole 59 are provided with a pressing projection 64 on one end side in the longitudinal direction. The buttons 63 and 65 are swung around the support pins 58 and 58 when the pressing protrusion 64 is pressed. Here, the pressing protrusion 64 is disposed on the opposite side in the longitudinal direction by the upper button 63 and the lower button 65. That is, they are arranged eccentrically (in a staggered manner so as to be symmetrical as seen from the front as shown in FIG. 5).

  Pressing protrusions 68 and 68 project from substantially the center in the longitudinal direction of the buttons 63 and 65, and both pressing protrusions 68 and 68 of the buttons 63 and 65 face each other. A rectangular hole 70 is formed in the center portion of the support plate 56, and the pressing protrusions 68, 68 of the buttons 63, 65 protrude from the vertical direction of FIG. In the button unit 57, a fixing screw 76 is inserted into the fixing hole 72 of the support plate 56, and this fixing screw 76 is screwed to a female screw 78 provided on the front end surface of the fixing rods 46, 46, thereby being attached to the knob rod 38. Fixed.

  A pair of levers 82 and 84 are sandwiched between the fixed rods 46 and 46 of the knob rod 38 via a shaft 86 inserted through the fixed rods 46 and 46 so as to be swingable. The levers 82 and 84 have end portions protruding through the rectangular holes 70 of the support plate 56, and a button biasing spring 66 is sandwiched between the end portions.

  The levers 82 and 84 have leg portions 63 a and 65 a that protrude toward the lock box 1. The leg portions 63a and 65a are engaged with the leg engaging portions 49a and 51a of the stoppers 49 and 51 described above.

  As shown in FIG. 5, the levers 82 and 84 protruding from the rectangular hole 70 are urged in the direction away from each other by the button urging spring 66 and press the pressing protrusions 68 and 68 of the buttons 63 and 65. Thereby, the pressing protrusions 64 of the buttons 63 and 65 protrude from the upper case 42 and the lower case 44. Further, the levers 82 and 84 are arranged in the direction away from each other by the button urging spring 66 so that the leg portions 63a and 65a are arranged horizontally. The pair of stoppers 49 and 51, in which the leg portions 63a and 65a are engaged with the leg portion engaging portions 49a and 51a, are arranged horizontally as described above, as shown in FIG. Then, it protrudes from the cylindrical portion 45 and engages with the engagement groove 55.

  On the other hand, when the buttons 63 and 65 are pushed in the approaching direction against the urging force of the button urging spring 66, the levers 82 and 84 are clamped by the pressing protrusions 68 and 68, and the leg portions 63a and 65a are opened. As a result, the pair of stoppers 49 and 51 are slid inwardly in the radial direction of the cylindrical portion 45 to operate to release the engagement with the engagement groove 55.

  The button unit 57 built in the knob 41 has the same front and back surfaces, and rotates in the direction of the arrow shown in FIG. Can be used. In other words, this crime prevention thumb turn can be made to correspond to the left and right sides of the door.

  Inside the fixed cylinder 21, a pair of release intersecting members 67, 69 slidable in the direction orthogonal to the axis of the thumb turn cylinder 43 are provided. As shown in FIG. 4, the release crossing member 67 has a stopper clamping piece 67b as one end projecting toward the knob 41 at the upper end of the vertical axis 67a, and projects toward the lock box at the lower end of the vertical axis 67a. And a separation piece 67c as the other end. Further, the release crossing member 69 has a stopper holding piece 69b as one end protruding toward the knob 41 at the lower end of the vertical axis 69a and the other end protruding toward the lock box at the upper end of the vertical axis 67a. The separation piece 69c.

  The release cross members 67 and 69 sandwich the pair of stoppers 49 and 51 in the gap between the spaced stopper holding pieces 67b and 69b by the compression spring 71 inserted between the stopper holding pieces 67b and 69b. The spacing pieces 67c and 69c are arranged in the approaching direction. A clamping plate, which will be described later, is disposed between the spacing pieces 67c and 69c.

  Two pairs of sandwiching plates 73a, 73b, 75a, 75b are swingably supported on the shafts 45a, 45a of the thumb turn cylinder 43. The sandwiching plates 73a, 73b, 75a, and 75b sandwich the protruding plate 39 of the core shaft 35 from both sides in the direction orthogonal to the axis. For example, the clamping plates 73a and 73b are from the right side, and the clamping plates 75a and 75b are from the left side. The clamping plates 73a, 73b, 75a, and 75b that sandwich the protruding plate 39 are opened by the protruding plate 39 when the cylinder lock is rotated by the key and the core shaft 35 is rotated accordingly. The sandwiching plates 73a, 73b, 75a, 75b move the separating pieces 67c, 69c, which are the other end portions of the pair of release cross members 67, 69, in the separating direction by the opening operation, and at one end portions. A pair of stoppers 49 and 51 are slid in the disengagement direction between the stopper holding pieces 67b and 69b.

Next, the operation of the security thumb turn 100 having the above configuration will be described.
FIG. 8 is an explanatory diagram of the operation at the time of unlocking the knob, FIG. 9 is an explanatory diagram of the operation at the time of the unlocking operation of the knob shown in FIG. 8, and FIG. 10 is a cross section taken along the line AA in FIG. Fig. 11 is an operation explanatory diagram showing the locked state in Fig. 11A, the cylinder lock rotating state in Fig. 11B, and Fig. 11 shows the locking state in the BB cross section of Fig. 2 in Fig. 2A. FIG. 12 is a diagram for explaining the operation, FIG. 12 is a diagram for explaining the operation in the state B-B in FIG. 2 (a), and FIG. 13 is a diagram for explaining the operation in the state in which the button is pushed in. It is operation | movement explanatory drawing which represented the state which rotated the knob | pick without pushing a button in (a) and the state in (b).

In the security thumb turn 100, in the locked state, the knob 41 is positioned in the horizontal direction, and the stoppers 49 and 51 provided in the thumb turn cylinder 43 protrude from the notch 47 by the urging force of the button urging spring 66, and FIG. As shown in FIG. 12A, the engaging groove 55 is engaged.
To release the locked state of the security thumb turn 100, the front and back buttons 63 and 65 protruding from the knob 41 are pressed.
When the buttons 63 and 65 are pushed in, the legs 63a and 65a are opened from a state where the legs 63a and 65a are horizontally aligned. Thereby, as shown in FIG. 12B, the pair of stoppers 49 and 51 are slid inward in the radial direction of the cylindrical portion 45 and are removed from the engaging groove 55. As a result, the engagement between the stoppers 49 and 51 and the engagement groove 55 is released, the thumb turn cylinder 43 can be rotated, and the knob 41 is rotated in the vertical direction.

  At this time, as shown in FIG. 8, the buttons 63 and 65 must press the pressing protrusion 64 with the pressing force 103 in the direction opposite to the direction of the moment 101 necessary for the rotation operation. That is, the pressing protrusions 68 and 68 of the buttons 63 and 65 are eccentrically arranged with the rotation center 111 (see FIG. 6) interposed therebetween so that the pressing force 103 in the direction opposite to the moment 101 in the unlocking direction is required. ing. In a normal correct unlocking operation, both the buttons 63 and 65 are pressed by a finger-picking operation on the knob 41, and unlocking can be performed by rotating the knob 41 as in the prior art.

  As a result, it is impossible to press the buttons 63 and 65 and simultaneously apply rotational force to the thumb turn to keep the buttons 63 and 65 in a pressed state due to play of the internal mechanism. Therefore, for example, the button 63 on one side, which has been feared in the past, is pressed with a stick or the like, and simultaneously the turning force is applied to the knob 41 to hold the one button 63 in the pressed state, and then the other side By applying a rotational force to the knob 41 while pressing the button 65 on the surface with a stick or the like, an illegal act of unlocking the knob 41 can be prevented.

  The security thumb turn 100 is used with the button unit 57 turned upside down as described above when the door is hung from right to left and the left and right sides are different from the present embodiment. In that case, as shown in FIG. 9, the pressing protrusion 64 is pressed with a pressing force 107 in the direction opposite to the direction of the moment 105 necessary for the rotation operation.

  In the vertical position rotated from the horizontal posture, the knob 41 is not formed with the engaging groove 55 on the inner periphery of the fixed cylinder 21 as shown in FIG. 3, so that the stoppers 49 and 51 are retracted into the cylindrical portion 45. It will be in a state as it is. Accordingly, the buttons 63 and 65 are held in a pressed state.

  On the other hand, in order to change from the unlocked state to the locked state, it is only necessary to rotate the knob 41 until it is in a horizontal state regardless of the operation of the buttons 63 and 65. That is, if the knob 41 is rotated from the vertical state to the horizontal state, the rotational force is transmitted to the core shaft 35 via the thumb turn cylinder 43, the release cross members 67 and 69, and the clamping plates 73a, 73b, 75a, and 75b. At the same time, the stoppers 49 and 51 are aligned with the engagement groove 55 and enter the engagement groove 55 by the urging force of the button urging spring 66, and the state shown in FIGS. 11 (a) and 12 (a) is obtained again. The buttons 63 and 65 protrude to complete the locking.

  Further, in the locked state, when the cylinder lock is operated with the key from the outdoor side, the input / output shaft of the lock box 1 rotates, and the core shaft 35 is rotated in conjunction with the rotation. When the core shaft 35 is rotated, the projection plate 39 is tilted, whereby the sandwiching plates 73a, 73b, 75a, and 75b are opened as shown in FIGS. 10 (a) to 10 (b). When the clamping plates 73a, 73b, 75a, 75b are opened, the separation pieces 67c, 69c of the release cross members 67, 69 are opened. As a result, the stopper holding pieces 67b, 69b of the release cross members 67, 69 are shown in FIG. As shown in FIG. 11B, the pair of stoppers 49 and 51 are sandwiched in the direction to be sandwiched, and the stoppers 49 and 51 are moved in a direction to be removed from the engagement groove 55.

  Thereby, even in the locked state, the restriction of the stoppers 49 and 51 is released by the operation of the cylinder lock, and the knob 41 is rotated.

  Further, when the knob 41 is rotated before the push of the buttons 63 and 65 by, for example, an inserted wire or bar, the stopper retracting recess 38a is changed from the state shown in FIG. 13 (a) to FIG. 13 (b). In this state, the stoppers 49 and 51 are displaced from each other, the stoppers 49 and 51 cannot be retracted into the stopper retracting recess 38a, and the stoppers 49 and 51 cannot be released. In this case, the buttons 63 and 65 cannot be pushed in by the stoppers 49 and 51 that have become non-slidable.

  Here, during normal operation, the position of the knob 41 is preferably held horizontally so that the stoppers 49 and 51 can enter the stopper retracting recess 38a so that the buttons 63 and 65 can be easily pushed. Such a horizontal holding mechanism can be realized by providing a click mechanism on the thumb turn cylinder 43 and the knob 38. That is, as shown in FIG. 13, the thumb turn cylinder 43 and the knob 38 are relatively rotatable with a predetermined play angle α. The play angle α can be set by a gap 85 formed by the interference portions 81 and 83 between the thumb turn cylinder 43 and the knob 38. A click ball 89 urged radially outward by the urging spring 87 is provided in the interference portion 81 on the thumb turn cylinder 43 side, and a concave groove 91 with which the click ball 89 comes into contact with the interference portion 83 on the knob rod 38 side is provided. Form. Accordingly, the knob 41 is held horizontally, and the stoppers 49 and 51 can enter the stopper retracting recess 38a, so that the buttons 63 and 65 can be easily pushed in during normal operation.

  In the unlocked state, when the locked state is set via the cylinder lock from the outdoor side, the stoppers 49 and 51 are not in the engaged state, so that a normal locking operation is performed. Further, after the sandwiching plates 73a, 73b, 75a, and 75b are opened by the inclined projection plate 39, they are rotated together with the thumb turn cylinder 43.

  According to the crime prevention thumb turn 100, unless the rotational force while pressing the buttons 63 and 65 is applied to the knob 41, in particular, when the pair of buttons 63 and 65 are respectively pressed and not rotated. The unlocking operation by the knob 41 cannot be performed, and thereby, the unauthorized unlocking by rotating the knob 41 by, for example, hooking the inserted wire or bar to the knob is prevented. In addition, as with a general thumb turn, the knob 41 can be picked and rotated, and can be locked regardless of the button operation when locked, and the stoppers 49 and 51 are automatically released when the key is locked using a cylinder lock from outside. Since the knob 41 is rotated, good operability is ensured. Furthermore, unlike the configuration in which a security cover or the like is covered, the vertical / horizontal posture of the knob 41 can be visually recognized by the screw cover / rotation direction visualizing means 54, so that the locking / unlocking state from the indoor side is the same as a general thumb turn. Can be easily confirmed.

  In addition to this, the pressing protrusions 68 and 68 of the buttons 63 and 65 are arranged eccentrically so that a pressing force 103 opposite to the moment 101 in the unlocking direction is required. At the same time, turning force is applied to the knob 41, and the buttons 63 and 65 are kept in a pressed state due to the play of the internal mechanism, etc., and a rotational force is applied to the knob 41 to prevent an illegal act of unlocking the knob 41. be able to.

  Since the pair of buttons 63 and 65 are provided across the rotation center 111 of the knob 41, there are two buttons 63 and 65 that require the moment 101 in the unlocking direction and the pressing force 103 in the opposite direction. , 65 in the pressed state is further difficult, and the crime prevention property of the button press type security thumb turn 100 can be further improved. Furthermore, since the rotation restriction is released by pressing the pair of buttons 63 and 65 at the same time, the moment 101 in the unlocking direction and the pressing force 103 in the opposite direction must be applied to the knob 41 from two directions at the same time. This makes it extremely difficult to illegally press the buttons 63 and 65 using a bar or wire.

  Further, according to the security thumb turn 100, the projection plate 39 of the core shaft 35 is clamped from both sides in the direction orthogonal to the axis by the two pairs of clamping plates 73a, 73b, 75a, 75b. The clamping plate 39 can be opened with the same moment in any rotation, and a smooth key operation can be performed regardless of the left and right of the cylinder lock.

  Furthermore, according to the security thumb turn 100, when the knob 41 is turned before the push of the buttons 63 and 65, the stopper retracting recess 38a is displaced from the stoppers 49 and 51, and the stoppers 49 and 51 cannot be released. As a result, the thumb-turn knob 41 is more difficult to rotate by hooking the inserted wire, rod or the like to the knob, and the crime prevention can be further improved.

  In the above-described embodiment, the example in which the knob 41 is formed in a substantially plate shape has been described. However, the present invention is not limited to this, and a shape in which an intermediate part is an bulging shape may be used. Alternatively, the shape may be a cone shape or a prism shape.

It is a perspective view of the security thumb turn which concerns on this invention attached to the lock box. It is a longitudinal cross-sectional view of the crime prevention thumb turn which concerns on this invention. It is a horizontal sectional view of a security thumb turn according to the present invention. FIG. 3 is an exploded view of the security thumb turn shown in FIG. 2. It is a front view of the knob shown in FIG. It is a disassembled perspective view of the knob shown in FIG. It is the perspective view which further decomposed | disassembled the button unit of the knob shown in FIG. It is operation | movement explanatory drawing at the time of unlocking operation of a knob. It is operation | movement explanatory drawing at the time of the unlocking operation of the knob shown in FIG. It is operation | movement explanatory drawing which represented the locked state in the AA cross section of FIG. 2 to (a), and represented the cylinder lock rotation state to (b). It is operation | movement explanatory drawing which represented the locked state in the BB cross section of FIG. 2 to (a), and represented the cylinder lock rotation state to (b). It is operation | movement explanatory drawing which represented the locking state in the BB cross section of FIG. 2 to (a), and represented the button pushing state to (b). FIG. 3 is an operation explanatory view showing a locked state in a CC cross section of FIG. 2 as (a) and a state where a knob is rotated without pushing a button in (b).

Explanation of symbols

41 ... Pinch 63, 65 ... Button 64 ... Pressing protrusion 100 ... Security thumb turn 101 ... Moment in unlocking direction 103 ... Pressing force 111 ... Rotation center

Claims (3)

A button that releases the rotation restriction when pressed is a security thumb turn provided on the knob,
A security thumb turn characterized in that the pressing projection of the button is arranged eccentrically with respect to the center of rotation so that a pressing force in the direction opposite to the moment in the unlocking direction of the knob is required. The crime prevention thumb turn according to claim 1, wherein a pair of the buttons are provided across the rotation center of the knob.   The crime prevention thumb turn according to claim 2, wherein the rotation restriction is released by simultaneously pressing the pair of buttons.

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