JP4295589B2 - Security thumb turn device - Google Patents

Description

  The present invention relates to a security thumb-turn device that prevents an unauthorized input of an unlocking operation force from being applied to a lock box by restricting the 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 security cover for thumb turn disclosed in the following Patent Document 2 which prevents the thumb turn from being locked and rotated.

  The security cover is formed with a fitting hole into which the thumb turn is fitted, and a portion covering the outer surface of the thumb turn that draws a circular locus during rotation is formed in a circular shape along the circular locus. Then, a set screw is provided which is screwed into the insertion hole, abuts against the side surface of the thumb turn, and is clamped from both sides. This security cover is fixed to the thumb turn by inserting a thumb turn into the insertion hole, covering the thumb turn so as to cover the security cover, and then screwing and tightening a set screw. Therefore, it becomes difficult to lock and rotate the wire or the like with the security cover placed on the thumb turn.

Moreover, what comprised the security cover from the attachment part and the main-body part is disclosed as another aspect of an above-described security cover. The mounting portion is formed with the outer shape of the above-described crime prevention cover so as to be easily operated by hand, and includes a locking projection that locks the main body portion. The attachment portion can easily rotate the thumb turn in a state where it is put on the thumb turn. Further, the main body portion has a locking portion that can be locked to the locking projection, and the security cover can be attached and detached by a simple operation called a locking operation. Furthermore, since the main body is idled at the locking portion, it has been impossible to lock the wire or the like and rotate it.
Japanese Examined Patent Publication No. 2-15715 (Fig. 1b, Fig. 1c) Japanese Utility Model Publication No. 4-40362

However, since the above-described conventional crime prevention cover has a cylindrical outer shape, a conventional picking operation in which a plate-like pick is sandwiched between fingers cannot be performed, and the operability is lowered.
In addition, when the thumb-turn is covered with a circular security cover, the thumb-turn is not visible due to its rotational position because it is originally an oval shape, and this also makes erroneous operations easy to occur. Thus, there is a problem that the operability of locking and unlocking is lowered.
Furthermore, since it is composed of a mounting portion that allows the thumb turn to rotate, and a main body portion that idles and can be attached to and detached from this mounting portion, storage management of the detached main body becomes complicated, and the main body portion is There was also a risk of loss.

  The present invention has been made in view of the above situation, and it is possible to prevent illegal unlocking of the thumb turn knob that hooks the inserted wire or rod to the knob, and it is possible to ensure good operability, and The purpose is to obtain a crime prevention thumb turn device that makes it possible to visually recognize the vertical and horizontal postures of the knob as well as the thumb turn.

Next, means for solving the above problems will be described with reference to the drawings corresponding to the embodiments.
The security thumb turn device 100 according to claim 1 of the present invention includes a fixed cylinder 21 fixed to the indoor surface side of the door,
A core shaft 35 rotatably provided in the fixed cylinder 21 and connected to the input / output shaft of the lock box;
A thumb turn cylinder 43 rotatably provided in the fixed cylinder 21;
A plate-shaped knob 41 attached to the thumb turn cylinder 43 and projecting indoors;
A pair of stoppers 49 and 51 are provided in the thumb turn cylinder 43 so as to be slidable in the direction orthogonal to the axis and project from the outer periphery of the thumb turn cylinder 43 and engage with the fixed cylinder 21 to prevent the rotation of the thumb turn cylinder 43. When,
A pair of buttons 63, 65 that have leg portions 63a, 65a and that protrude from the front and back surfaces of the knob 41 and are simultaneously pressed to release the engagement of the stoppers 49, 51 via the leg portions 63a, 65a; ,
A button urging spring 66 for urging the stoppers 49 and 51 in the engaging direction via the leg portions 63a and 65a by urging the pair of buttons 63 and 65 in the separating direction;
The pair of stoppers 49 and 51 are sandwiched by a gap between one end portions 67b and 69b provided in the thumb turn cylinder 43 so as to be slidable in the direction orthogonal to the axis and separated by a compression spring 71, and between the other end portions 67c and 69c. A pair of release cross members 67, 69 arranged in the approach direction;
A projecting plate 39 supported swingably on the thumb turn cylinder 43 and projecting from the core shaft 35 is sandwiched from both sides in the direction orthogonal to the axis, and is opened by the projecting plate 39 by the rotational input of the core shaft 35. The other end portions 67c and 69c of the pair of release cross members 67 and 69 are moved away from each other by the leg opening operation, and the pair of stoppers 49 and 51 are slid in the disengagement direction between the one end portions 67b and 69b. Two pairs of clamping plates 73a, 73b, 75a, 75b to be moved;
It is characterized by comprising.

  In this crime prevention thumb turn device 100, if the buttons 63 and 65 are pressed and the rotational force is not applied to the knob 41, the unlocking operation cannot be performed by the knob 41, thereby hooking the inserted wire or bar to the knob. Thus, unauthorized unlocking by rotating the knob 41 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 control by the buttons 63 and 65 is automatically performed when the key is locked with a cylinder lock from outside. The knob 41 is released after being released. Further, unlike the configuration in which the conventional crime prevention cover is put, the knob 41 is formed in a plate shape, so that the vertical and horizontal postures can be visually recognized. Further, two pairs of sandwiching plates 73a, 73b, 75a, and 75b sandwiching the projecting plate 39 in the upper and lower directions make the projecting plate 39 of the core shaft 35 a total of two pairs from the left and right (both sides) in the axis orthogonal direction, that is, four sheets. Since the sandwiching plates 73a, 73b, 75a, and 75b are sandwiched, the sandwiching plates 73a, 73b, 75a, and 75b are opened with the same moment in both the right rotation and the left rotation of the core shaft 35.

  The crime prevention thumb turn device 100 according to claim 2 is characterized in that the outline of the knob 41 is formed in a curved line.

  In this crime prevention thumb turn device 100, even if an attempt is made to hook a wire to a knob or to push and rotate a wire, the wire or the rod is easily slipped because there is no corner portion, and it is difficult to apply these energizing rotational operation forces. . In addition, since the corner portion is eliminated, the fit feeling with fingers is also improved.

  The crime prevention thumb turn device 100 according to claim 3, wherein the knob 41 is fixed to the thumb turn cylinder 43 by the knob fixing means 40 in the axial direction of the thumb turn cylinder 43, and a cover 42 having a predetermined shape covering the knob fixing means 40 is provided. It is attached to the knob 41, and the cover 42 is colored in a color different from that of the knob.

  In the security thumb turn device 100, the knob fixing means 40 is hidden by the cover 42 and is not exposed. Further, since the cover 42 having a predetermined shape has a color different from that of the knob, for example, if the cover 42 has a rectangular shape or the like, a mark effect that makes it easy to grasp the horizontal and vertical directions of the knob 41 is produced.

  According to the crime prevention thumb turn device of the first aspect of the present invention, since the control by the button is released and the knob can be rotated, the operation by the knob is not performed unless a pair of buttons are pressed and a rotational force is applied to the knob. Unable to perform this, and thus, the unlocking by rotating the thumb-turn knob by hooking the inserted wire, rod or the like to the knob can be prevented, and crime prevention can be improved. In addition, like a general thumb turn, it can be rotated by picking a knob, and it can be locked regardless of the button when locking, and the restriction of the button is automatically released when the key is locked using a cylinder lock from outside. Since it rotates, good operability can be ensured. In addition, unlike the conventional thumb turn, unlike the conventional thumb turn, it is easy to check the locked / unlocked state from the indoor side because the vertical and horizontal postures can be visually recognized if the knob is shaped like a plate. can do. In addition, since the core plate's protruding plate is clamped from both sides in the direction orthogonal to the axis by two pairs of clamping plates, the clamping plate can be opened with substantially the same moment in both the right and left rotations of the core shaft. It is possible to enable a smooth key operation regardless of whether the lock is left or right.

  According to the crime prevention thumb turn device of claim 2, since the outline shape of the knob is formed with a curve, it is possible to improve the ease of picking and the feeling of operation, and it is possible to catch and push by a wire or a rod. It becomes even more difficult, and crime prevention can be further enhanced.

  According to the crime prevention thumb turn device of claim 3, the cover of the predetermined shape that covers the knob fixing means is attached to the knob and the cover is colored in a color different from that of the knob, so that the knob fixing means can be concealed to improve the appearance. At the same time, it is possible to make it easy to see the knob itself, and to make it easier to visually recognize the rotary position of the knob (that is, the locked state or the unlocked state).

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a preferred embodiment of a security thumb turn device according to the present invention will be described in detail with reference to the drawings.
FIG. 1 is an explanatory view showing the unlocked state of the security thumb turn device according to the present invention in (a) and the longitudinal sectional view is shown in (b), and FIG. 2 is a longitudinal section of the security thumb turn device in the locked state according to the present invention. FIG. 3 is an exploded view of the crime prevention thumb turn device shown in FIG. 1, and FIG. 4 is the crime prevention diagram shown in FIG. FIG. 5 is an exploded perspective view of the thumb turn device, and FIG.

  A lock box is provided on a door (not shown) to which the security thumb turn device 100 according to the present embodiment is attached. The lock box is provided with a latch bolt, a dead bolt, and a lock box mechanism for advancing and retreating the latch bolt and the dead bolt from the door mouth. The dead bolt of the lock box is a cylinder lock provided on the outdoor side of the door with a key or a thumb turn knob (hereinafter simply referred to as “pick”) provided on the indoor side of the door. By moving, it is possible to advance and retreat from the doorhole. The security thumb turn device 100 is operated to enable or disable the picking operation by the following configuration.

  A fixed cylinder 21 is fixed to the door or the lock box. 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 a lock box 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. 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 38 that engages with a circumferential groove 37 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. The protruding plate 39 protrudes along the axis of the core shaft 35 and is formed in a substantially rectangular plate shape. Therefore, when the input / output shaft (not shown) of the lock box is rotated, the protruding plate 39 is rotated.

  A thumb turn cylinder 43 to which the knob 41 is attached is rotatably provided inside the distal end side of the fixed cylinder 21. The knob 41 has a curved contour shape. Thereby, even if it tries to hook the wire to the knob 41 or to push and push it with a stick, the wire and the stick are 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.

  The knob 41 is attached to the thumb turn cylinder 43 by the knob fixing means 40 in the axial direction of the thumb turn cylinder 43. In the present embodiment, the knob fixing means includes a fixing screw 40. The fixing screw 40 is accommodated in a recess 41 a that is recessed in the end face of the knob 41. A screw cover 42 as a cover is attached to the recess 41a in a locked state. The screw cover 42 is formed in a rectangular shape in the present embodiment, and is colored in a color different from that of the knob 41. The screw cover 42 may be colored by applying a resin kneaded with a phosphorescent agent or a fluorescent paint. Thereby, the knob fixing screw 40 is hidden by the screw cover 42 and is not exposed. Further, since the rectangular screw cover 42 has a color different from that of the knob 41, a mark effect that makes it easy to grasp the horizontal and vertical directions of the knob 41 occurs.

  The knob 41 attached to the thumb turn cylinder 43 is shaped like a plate and protrudes from the central hole 27 of the decorative cylinder 29 to the indoor side.

  As shown in FIG. 5, the rear part of the thumb turn cylinder 43 is a cylindrical part 45, and the cylindrical part 45 is formed with notches 47 that open at both ends in the diameter direction. A pair of shafts 45a and 45a that support a clamping plate, which will be described later, protrude from the rear end surface of the cylindrical portion 45 toward the lock box. 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 shown in FIG.

  The pair of stoppers 49 and 51 are slid outward in the radial direction of the cylindrical portion 45 by engaging leg portions 63a and 65a provided on buttons 63 and 65, which will be described later, with the leg portion engaging portions 49a and 51a. It is moved, protrudes from the notch 47, and engages with an engagement 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.

  On the other hand, dents 57, 57 are formed on the front and back surfaces of the knob 41, and a rectangular button accommodation hole 59 is formed through the front and back surfaces in the dents 57, 57. In the button receiving hole 59, a pair of buttons 63 and 65 which are swingable by the swing shaft 61 are stored. The buttons 63 and 65 have leg portions 63a and 65a that protrude toward the lock box. The leg portions 63a and 65a are inserted into the leg engaging portions 49a and 51a of the stoppers 49 and 51 described above.

  A button urging spring 66 is inserted between the knob plates 63b and 65b of the buttons 63 and 65, and the button urging spring 66 urges the knob plates 63b and 65b in the separating direction. The buttons 63 and 65 are arranged such that the leg portions 63a and 65a are arranged horizontally by arranging the knob plates 63b and 65b in the direction away from each other by the button urging spring 66. The pair of stoppers 49 and 51, in which the leg portions 63a and 65a are inserted into the leg engaging portions 49a and 51a, protrude from the cylindrical portion 45 by the leg portions 63a and 65a being horizontally arranged in this way. To engage with the engaging groove 55.

  On the other hand, the legs 63a and 65a of the buttons 63 and 65 are opened when the grip plates 63b and 65b are gripped in the approaching direction against the biasing force of the button biasing spring 66. As a result, the pair of stoppers 49 and 51 are slid inward in the radial direction of the cylindrical portion 45 to operate to release the engagement with the engagement groove 55.

  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. 5, the release crossing member 67 has a stopper holding piece 67b as one end protruding toward the knob 41 at the upper end of the vertical axis 67a, and protruding toward the lock box side 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.

  Each release crossing member 67, 69 has a pair of stoppers 49, 51 in a gap between the stopper holding pieces 67b, 69b separated by the compression spring 71 inserted between the stopper holding pieces 67b, 69b. While sandwiching, 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 clamping plates 73a, 73b, 75a, and 75b move the other end portions of the pair of release intersecting members 67 and 69 (separate pieces 67c and 69c) in the separating direction by the opening operation, and end portions ( The pair of stoppers 49 and 51 are slid in the disengagement direction by the stopper clamping pieces 67b and 69b).

Next, the operation of the security thumb turn device having the above-described configuration will be described.
FIG. 6 is an operation explanatory diagram in which the longitudinal sectional view of the locked state of the security thumb turn device shown in FIG. 1 is (a), the BB arrow of (a) is shown in (b), and FIG. 7 is shown in FIG. FIG. 8 is an operation explanatory view showing a longitudinal sectional view of the security thumb-turn device when the lock is released (a), a CC arrow view of (a) in (b), and FIG. 8 is a cylinder of the security thumb-turn device shown in FIG. It is operation | movement explanatory drawing which represented (a), the DD arrow view of (a) at (b), and the EE arrow view of (a) by (c) at the time of the longitudinal cross-sectional view at the time of lock release from a lock | rock. .

In the locked state shown in FIG. 6, 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 engage with the engaging groove 55. Match.
To release the locked state of the security thumb-turn device 100, as shown in FIG. 7, the buttons 63 and 65 on the front and rear surfaces protruding from the knob 41 are simultaneously pressed.
When the buttons 63 and 65 are pressed, the legs 63a and 65a are opened from the horizontally aligned state shown in FIG. 6 to the state shown in FIG. As a result, the pair of stoppers 49, 51 are slid inward in the radial direction of the cylindrical portion 45, and are removed from the engagement 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, since the engaging groove 55 is not formed on the inner periphery of the fixed cylinder 21 as shown in FIG. 2B at the vertical position of the knob 41, the stoppers 49 and 51 are retracted into the cylindrical portion 45. It will remain 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 are engaged with the engagement groove 55 by the urging force of the button urging spring 66, so that the state shown in FIG. Locking is complete.

  Further, in the locked state shown in FIG. 8, when the cylinder lock is operated with the key from the outdoor side, the input / output shaft of the lock box rotates, and the core shaft 35 rotates 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 FIG. 8B. When the clamping plates 73a, 73b, 75a, 75b are opened, the separating pieces 67c, 69c of the release cross members 67, 69 are opened, and as a result, a pair of stopper holding pieces 67b, 69b of the release cross members 67, 69 are paired. The stoppers 49 and 51 are sandwiched in the direction in which the stoppers 49 and 51 are sandwiched, and the stoppers 49 and 51 are moved in a direction in which the stoppers 49 and 51 are 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.

  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 security thumb-turn device 100, if the rotational force while pressing the buttons 63 and 65 is not applied to the knob 41, in particular, the knob 63 and 65 must be pressed and rotated while the buttons 63 and 65 are pressed. For example, 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 locking, 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 conventional configuration in which the security cover is put on, the vertical / horizontal posture of the knob 41 can be visually recognized, so that the locking / unlocking state from the indoor side can be easily confirmed as in the case of a general thumb turn. .

  Further, in this security thumb turn device 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. In either rotation, the sandwiching plate 39 can be opened with the same moment, and a smooth key operation can be performed regardless of whether the cylinder lock is right or left.

  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 explanatory drawing which represented the front view of the unlocking state of the crime prevention thumb turn apparatus which concerns on this invention in (a), and represented the longitudinal cross-sectional view in (b). It is explanatory drawing which represented the longitudinal cross-sectional view of the locking state of the security thumb turn device which concerns on this invention by (a) and the AA arrow of (a) by (b). FIG. 2 is an exploded view of the security thumb turn device shown in FIG. 1. FIG. 3 is an exploded view of the security thumb turn device shown in FIG. 2. It is a principal part perspective view of FIG. It is operation | movement explanatory drawing which represented (a) and the BB arrow of (a) by (b) in the longitudinal cross-sectional view of the locked state of the security thumb turn apparatus shown in FIG. It is operation | movement explanatory drawing which represented (a) and CC arrow of (a) by (b) at the time of the longitudinal cross-sectional view at the time of lock release of the security thumb turn apparatus shown in FIG. 1A is a longitudinal cross-sectional view of the security thumb turn device shown in FIG. 1 when the lock is released from the cylinder lock, FIG. 1A is a DD arrow view of FIG. 1B, and FIG. It is operation | movement explanatory drawing represented by c).

Explanation of symbols

21 ... Fixed cylinder 35 ... Core shaft 39 ... Projection plate 40 ... Pick fixing means (fixing screw)
41 ... knob 42 ... cover (screw cover)
43 ... Thumbnail tube 49, 51 ... Stopper 63, 65 ... Button 63a, 65a ... Leg portion 66 ... Button biasing spring 67, 69 ... Release cross member 67b, 69b ... One end (stopper holding piece)
67c, 69c ... the other end (spaced piece)
71 ... Compression spring 73a, 73b, 75a, 75b ... Clamping plate 100 ... Security thumb turn device Ds ... Indoor surface

Claims (3)

A fixed cylinder fixed to the indoor side of the door;
A core shaft rotatably provided in the fixed cylinder and connected to the input / output shaft of the lock box;
A thumb turn cylinder rotatably provided in the fixed cylinder;
A plate-shaped knob that is attached to the thumb turn tube and protrudes indoors;
A pair of stoppers provided in the thumb turn cylinder so as to be slidable in the direction orthogonal to the axis and protruding from the outer periphery of the thumb turn cylinder and engaging the fixed cylinder to prevent the rotation of the thumb turn cylinder;
A pair of buttons that have leg portions and project on the front and back surfaces of the knob and are simultaneously pressed to release the engagement of the stopper via the leg portions;
A button urging spring that urges the stopper in the engaging direction via the legs by urging the pair of buttons in the separating direction;
A pair of release intersections in which the pair of stoppers are sandwiched by a gap between one end portions provided in the thumb turn cylinder so as to be slidable in a direction orthogonal to the axis and separated by a compression spring, and the other end portions are disposed in the approaching direction. A member,
A projecting plate supported swingably on the thumb turn cylinder and projecting from the core shaft is sandwiched from both sides in the direction orthogonal to the axis, and is opened by the projecting plate by the rotation input of the core shaft, Two pairs of sandwiching plates that move the other ends of the pair of release cross members in the separating direction and slide the pair of stoppers in the engagement release direction between the one ends; and
A security thumb turn device characterized by comprising:   The crime prevention thumb turn device according to claim 1, wherein a contour shape of the knob is formed by a curve.   The knob is fixed to the thumb turn cylinder by a thumb fixing means in the axial direction of the thumb turn cylinder, a cover having a predetermined shape covering the knob fixing means is attached to the knob, and the cover is colored in a color different from that of the knob The crime prevention thumb turn device according to claim 1 or claim 2, wherein

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