JP4828272B2 - Security thumb turn - Google Patents

Description

  The present invention relates to a crime prevention thumb turn that can disable a thumb turn used for locking and unlocking a door to improve crime prevention.

Conventionally, a locking device with a thumb turn has a built-in lock box in an opening / closing body such as a door. And are provided.
The lock box is provided with, for example, a dead bolt, which is a lock member, so as to be able to advance and retreat from the end face (the end) of the opening / closing body.

In this type of locking device, the deadbolt is advanced and retracted from the top of the opening and closing body by inserting a key into the keyhole of the cylinder lock exposed to the outdoor side and rotating it. Locking / unlocking is performed on a strike provided in an opening frame body which is a frame.
Moreover, from the indoor side, the dead bolt is advanced and retracted simply by rotating the thumb-turn knob so that the opening and closing body can be easily locked and unlocked.
Japanese Patent No. 328484 (FIG. 1)

  In recent years, a glass plate has been fitted to the opening and closing bodies of condominiums and residences, or the wall around the opening frame in the vicinity of the opening and closing bodies of these entrance doors for the purpose of enhancing luxury and grace. Small windows are used frequently.

  However, in an opening / closing body having such a small window or an opening / closing body provided with a small window in the vicinity, if the glass plate of the small window is broken, the thumb turn of the opening / closing body is manipulated illegally by inserting a hand from the outside. There is also a risk that the thumb turn may be manipulated illegally by inserting a wire or a rod whose tip is bent like a hook.

In general, the rotary thumb turn often used for doors has a shape in which a knob exposed on the indoor side projects a wing portion radially outward from the center of rotation as shown in FIG. For this reason, there is a case where an unauthorized unlocking operation can be performed by hooking a hook-shaped tip obtained by bending a wire or the like to the wing plate portion and applying a rotational moment.
In addition, even in the above-mentioned opening / closing body without a small window, the thumb turn is also illegally unlocked if there is a hole or gap for inserting a wire, such as a post opening, in the opening / closing body itself or the wall near the opening / closing body. There was a risk of being.

  The present invention has been made in view of the above circumstances, and provides a crime prevention thumb turn that can prevent unauthorized unlocking by rotating the thumb turn by hooking an inserted wire or bar to the thumb turn, and to improve crime prevention performance. 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 according to claim 1 of the present invention comprises a thumb turn shaft 23 having one end connected to the locking mechanism 15 in the lock box 13 and having the other end surface provided with a detachable hole 25;
A decorative ring 31 having an exposed hole 35 for exposing the other end surface and covering the thumb turn shaft 23;
An operating member 39 slidably provided in the decorative ring 31 and covering or fully opening at least a part of the exposed hole 35 according to a sliding position;
A labeling member 47 for displaying the locking labeling area or the unlocking labeling area from the state display window 31b of the decorative ring 31 by interlocking with the thumb turn shaft 23;
An attachment / detachment shaft 51a that is detachably attached to the attachment / detachment hole 25 at a predetermined rotation angle corresponding to the rotation angle of the thumb-turn shaft 23 by a rotation direction restricting means 53 provided between the attachment / detachment hole 25 is used as a tip. A detachable thumb turn 51 having a plate-like knob 51b fixed in parallel to the axis at the base end of the detachable shaft 51a;
Comprising
The attachment / detachment hole 25 is formed of a substantially square hole,
The distal end of the detachable shaft 51a is formed by a quadrangular prism that fits into the detachable hole 25,
A cylindrical fitting shaft 55 projects from the center of each of the substantially square holes of the attachment / detachment hole 25,
A fitting hole 57 for fitting into the fitting shaft 55 is formed at the tip of the detachable shaft 51a,
The rotation direction restricting means 53 includes projections 51c and 51c protruding from two outer surfaces of the attachment / detachment shaft 51a, and cutout portions 25a and 25a formed on two inner surfaces facing the attachment / detachment hole 25, The protrusions 51c, 51c enter the notches 25a, 25a, and the attachment / detachment hole 25 and the attachment / detachment shaft 51a are fitted together,
When the detachable thumb turn 51 is mounted, the detachable thumb turn 51 can be mounted in a rotational direction that matches the locking / unlocking state of the thumb turn shaft 23.

  In this crime prevention thumb turn, the detachable thumb turn 51 can be removed, so that unauthorized unlocking by rotating the thumb turn by hooking the inserted wire or bar to the thumb turn is prevented. When the detachable thumb turn 51 is mounted, the detachable thumb turn 51 is mounted in a rotational direction that matches the locked / unlocked state of the thumb turn shaft 23. Moreover, since the removable thumb turn 51 has the same appearance as a normal thumb turn, there is no sense of incongruity even if it is worn. Furthermore, even if the locking indication area or the unlocking indication area corresponding to the locking / unlocking state is displayed from the status display window of the decorative ring 31, the removable thumb turn 51 is detached, and the knob 51b cannot be visually recognized. The locking / unlocking state of the mechanism 15 can be grasped.

  In this crime prevention thumb turn, the thumb turn shaft 23 and the detachable thumb turn 51 are fitted with a double fitting structure, and a secure fitting without backlash is possible with a short fitting length in the axial direction.

  The crime prevention thumb turn according to claim 2 is characterized in that the marking member 47 has a pair of locking marking areas across the unlocking marking area.

  In this crime prevention thumb turn, the normal knob 51b is unlocked in the vertical state, and the knob 51b is locked in the horizontal state. Therefore, the unlocking indication area is marked on the state display window 31b of the decorative ring 31. Even if the detachable thumb turn 51 is rotated in either the right rotation direction or the left rotation direction from the state of being in the locked state, the lock marking area can be marked.

  The crime prevention thumb turn according to claim 3, wherein the edge 43 a of the operation member 39 enters the circumferential groove 59 formed in the shaft portion of the removable thumb turn 51 when the removable thumb turn 51 is attached. The removal from the attachment / detachment hole 25 is restricted.

  In this crime prevention thumb turn, when the removable thumb turn 51 is attached, the edge 43a of the operating member 39 enters the circumferential groove 59 of the removable thumb turn shaft portion, and the movement of the removable thumb turn 51 in the axial direction is restricted. Will remain attached without falling off.

  The crime prevention thumb turn according to claim 4 is characterized in that the operation member 39 is disposed at a sliding position where at least a part of the attachment / detachment hole 25 is covered by the biasing means 41.

  In this crime prevention thumb turn, the exposed hole 35 of the decorative ring 31 is covered with the operation member 39 slidably disposed by the biasing means 41 with the removable thumb turn 51 removed. In order to fully open the detachable hole 25, the operation member 39 must be slid and held against the urging force of the urging means 41. Accordingly, it is difficult to perform an illegal rotation operation of the thumb turn shaft 23 by inserting a rod or the like into the attachment / detachment hole.

  The crime prevention thumb turn according to claim 5 is characterized in that a thumb turn gear 23a is formed on the outer periphery of the thumb turn shaft 23, and a tooth portion 47a is formed on the indicating member 47 so that they are meshed with each other and interlocked. To do.

  In this crime prevention thumb turn, the thumb turn shaft 23 and the marking member 47 are configured such that the gears mesh with each other, so that the marking member 47 reliably follows the rotation of the thumb turn shaft 23.

  According to the crime prevention thumb turn of the first aspect of the present invention, the thumb turn shaft having one end connected to the locking mechanism and having the attachment / detachment hole on the other end surface is shown in the state where the attachment / detachment hole is exposed through the exposure hole. An operating member that covers or fully opens at least a part of the decorative ring is provided on the decorative ring, and an indicating member that exposes the locked or unlocked indicating area from the state display window of the decorative ring by interlocking with the thumb turn shaft. It has a removable thumb turn that can be freely attached to and removed from the mounting hole at a predetermined rotation angle according to the rotation angle of the thumb turn shaft, so it can be inserted when going out or sleeping, etc. Unauthorized unlocking by rotating a thumb turn by hooking a wire or a bar on the thumb turn can be prevented and crime prevention can be improved. When the detachable thumb turn is mounted, the detachable thumb turn can be mounted in a rotational direction that matches the locking / unlocking state of the thumb turn shaft. Thereby, the locking / unlocking state of the locking mechanism can be easily recognized by the vertical or horizontal posture of the knob. In addition, since the removable thumb turn has the same appearance as a normal thumb turn having a plate-shaped knob at the base end, it is possible to obtain a feeling of use that is not discomforting with a normal thumb turn even when the removable thumb turn is still attached. it can. Furthermore, since the marking member interlocked with the thumb-turn shaft can display the locking indication area or the unlocking indication area corresponding to the unlocking state from the state display window of the decorative ring, the removable thumb turn is detached and the knob portion cannot be visually recognized. Even in this case, the locking / unlocking state of the locking mechanism can be easily grasped from the state display window.

  Further, according to this security thumb turn, a fitting shaft protrudes from the center of the attachment / detachment hole on the other end surface of the thumb turn shaft which is a polygonal hole, and a fitting hole to be fitted to this fitting shaft at the tip of the thumb turn shaft. Since the thumb turn shaft and the detachable thumb turn are fitted with a double fitting structure, the axial length is short and the fitting can be performed without rattling. . As a result, the protruding height of the removable thumb turn from the door surface can be reduced.

  According to the crime prevention thumb turn of claim 2, since the marking member has a pair of locking marking areas across the unlocking marking area, the security thumb turn can be applied to any right hand or left hand difference. it can.

  According to the crime prevention thumb turn of the third aspect, since the edge portion of the operating member enters the circumferential groove of the removable thumb turn shaft portion in the mounted state of the removable thumb turn, the falling of the removable thumb turn can be restricted.

  According to the crime prevention thumb turn of claim 4, since the operating member is arranged at a sliding position that covers at least a part of the attachment / detachment hole by the urging means, in the state where the attachment / detachment thumb turn is detached, the exposed hole of the decorative ring Is covered with the operation member, making it difficult to perform an illegal rotation operation of the thumb-turn shaft by inserting a rod or the like into the attachment / detachment hole, thereby improving the crime prevention performance.

  In the crime prevention thumb turn according to claim 5, the thumb turn gear is formed on the outer periphery of the thumb turn shaft, the tooth portion is formed on the marking member, and the thumb turn shaft and the marking member are connected to each other. Are configured to mesh with each other, and the marking member is reliably driven by the rotation of the thumb turn shaft.

Hereinafter, a preferred embodiment of a security thumb turn according to the present invention will be described in detail with reference to the drawings.
FIG. 1 is a longitudinal sectional view of a security thumb turn according to the present invention, FIG. 2 is a transverse sectional view of the security thumb turn according to the present invention, and FIG. 3 is a front view of the security thumb turn shown in FIG. 4 is an exploded side view of the security thumb turn shown in FIG. 1, FIG. 5 is an exploded plan view of the security thumb turn shown in FIG. 2, FIG. 6 is an exploded perspective view of the security thumb turn shown in FIG. It is a longitudinal cross-sectional view.
A lock box 13 is built in the door 11, and the lock box 13 accommodates a locking mechanism 15 therein. An outdoor cylinder unit (not shown) that allows the lock box 13 to be locked and unlocked from the outdoor side is attached to the outdoor side surface of the door 11. A security thumb turn 100 according to the present embodiment is attached to the indoor side surface of the door 11.

  The lock box 13 is built in the end portion of the door 11 on the side of the door 11, and a front plate (not shown) fixed to the lock box 13 is attached to the door 11 so as to be exposed to the end of the door 11. The locking mechanism 15 built in the lock box 13 is provided with a dead bolt (not shown). The dead bolt moves forward and backward with respect to the lock box 13 by the operation of the outdoor cylinder unit and the security thumb turn 100 and protrudes from the front plate of the door 11. It has come to be retreated. That is, the door frame can be locked and unlocked. Here, a description of the specific mechanism is omitted.

  In the security thumb turn 100, a base 17 as a base member is screwed to the lock box 13 by a pair of fixing screws 19 and 19 arranged in the lateral direction. A stepped bearing portion 21 is formed at the center of the base 17, and the bearing portion 21 rotatably supports a thumb turn shaft 23. One end of the thumb turn shaft 23 is connected to the locking mechanism 15 in the lock box 13. An attachment / detachment hole 25 is formed in the other end surface of the thumb turn shaft 23. Reference numeral 27 denotes a collar which is externally attached to the fixing screws 19 and 19 to fix the lock box 13 and the base 17 apart.

  A thumb turn gear 23a is formed on the outer periphery of the thumb turn shaft 23, and the thumb turn shaft 23 meshes with a marking member described later. A bracket 29 is engaged with the base 17, and the bracket 29 is engaged with locking plates 29a and 29a bent to the left and right sides to locking protrusions 17a and 17a on both sides of the base 17 shown in FIG. 17 is attached.

  A decorative ring 31 is attached to the outer side of the bracket 29 attached to the base 17. The decorative ring 31 is attached to the base 17 by engaging upper and lower concave portions or convex portions (31 a, 31 a) formed on both side portions with upper and lower protrusions or groove portions protruding or recessed on both side portions of the base 17. .

  The bracket 29 is formed with a through hole 33 for exposing the attachment / detachment hole 25 of the thumb turn shaft 23. The decorative ring 31 is provided with an exposing hole 35 for exposing the attaching / detaching hole 25 of the thumb turn shaft 23 through the through hole 33.

  An operation member 39 is provided between the other end surface of the thumb turn shaft 23 and the bracket 29 via a washer 37 so as to be slidable in the vertical direction of FIG. The operation member 39 is prevented from dropping downward by projecting the spring seat 39a into the recess 17c (see FIG. 4) of the base 17. In addition, a finger hook portion 39 b that is bent toward the door 11 is provided at the lower end of the operation member 39. A coil spring 41 as an urging means is interposed between the top surface of the recess 17c and the spring seat 39a, and the coil spring 41 places the operation member 39 in the downward sliding position. The operation member 39 is provided with an insertion hole 43 (see FIG. 6). The insertion hole 43 is arranged at a sliding position in the downward direction, so that at least a part of the exposed hole 35 formed in the decorative ring 31 is covered with the substantially semicircular edge 43a. . Moreover, the insertion hole 43 opens the exposed hole 35 fully by arrange | positioning the insertion hole 43 in the upward sliding position.

  The edge 43a of the insertion hole 43 engages with a circumferential groove of a detachable thumb turn described later. The insertion hole 43 is arranged at a sliding position that covers at least a part of the attachment / detachment hole 25 when the operation member 39 is biased by the coil spring 41 in a normal state, that is, in a state where no operation force is applied.

  A support shaft 45 protrudes above the bearing portion 21 on the base 17, and the support shaft 45 is rotatably supported by a marking member 47 having a tooth portion 47a on the outer periphery. A marking area 49 is formed on the upper surface of the marking member 47. The marking area 49 includes a locking marking area and an unlocking marking area. For example, each area is color-coded. The unlocking indication area is blue. In the present embodiment, the shaded portion in the range of about 90 ° in FIG. 6 is, for example, blue as the unlocking display area, and red, etc., with the surface of the other marking member 47 as the locking indication area, that is, the unlocking indication area. It is supposed that the locking marking area is located across the. The marking area 49 is visible from the state display window 31 b formed in the decorative ring 31. The marking member 47 is engaged with the thumb turn shaft 23 by meshing the tooth portion 47a with the thumb turn gear 23a, and is driven by the thumb turn shaft 23.

  In other words, the marking member 47 has a thumb turn shaft 23 interlocked with the locking mechanism 15 in the locking rotation position, a lock indication region is arranged in the state display window 31b of the decorative ring 31, and the thumb turn shaft 23 is in the unlocking rotation position. An unlocking marking area is arranged in the window 31b. The decorative ring 31 is attached to the base 17 so as to cover the thumb turn shaft 23, the bracket 29, and the marking member 47.

  An attachment / detachment shaft 51a which is the tip of the attachment / detachment thumb turn 51 is attachable / detachable to the exposed hole 35 of the decorative ring 31. In the detachable thumb turn 51, a plate-shaped knob 51b is fixed to the base end of the detachable shaft 51a in parallel with the axis. The knob 51 b is formed such that the vertical length shown in FIG. 7 is slightly smaller than the diameter of the decorative ring 31. In addition, about the shape of this knob | pick part 51b, it is not limited to this plate shape, You may comprise as another shape. The attachment / detachment shaft 51a and the attachment / detachment hole 25 of the thumb turn shaft 23 are provided with a rotation direction restricting means 53 over both. In the present embodiment, the rotation direction restricting means 53 includes protrusions 51c and 51c projecting from the upper and lower surfaces of the attaching / detaching shaft 51a, and notches 25a and 25a formed on the upper and lower inner surfaces of the attaching / detaching hole 25. In addition, the attachment / detachment hole 25 is a substantially polygonal hole, but in the present embodiment, the attachment / detachment hole 25 is formed by a substantially square hole, and the tip of the attachment / detachment shaft 51a is formed by a quadrangular column that fits into the square hole.

  By providing the rotation direction restricting means 53 across the attachment / detachment shaft 51a and the attachment / detachment hole 25, the attachment / detachment thumb turn 51 can be attached / detached to / from the attachment / detachment hole 25 at a predetermined rotation angle corresponding to the rotation angle of the thumb turn shaft 23. For example, when the thumb turn shaft 23 is in the unlocking rotation position (position shown in FIG. 6), the detachable thumb turn 51 can be mounted only in the direction (the direction shown in FIG. 6) in which the knob 51b is vertical. Further, when the thumb turn shaft 23 is in the locked rotation position, the removable thumb turn 51 can be mounted only in the direction in which the knob 51b is horizontal.

  In the present embodiment, a fitting shaft 55 projects from the center of the square hole of the attaching / detaching hole 25, and a fitting hole 57 for fitting to the fitting shaft 55 is formed at the tip of the attaching / detaching shaft 51a. Thereby, the thumb turn shaft 23 and the detachable thumb turn 51 are fitted with a double fitting structure, and the fitting can be surely performed without a backlash with a short fitting length in the axial direction. As a result, the protrusion height of the removable thumb turn 51 from the door surface 11a can be lowered.

  A circumferential groove 59 is formed in the shaft portion of the detachable thumb turn 51, and this circumferential groove 59 is engaged with the edge 43 a of the operation member 39. In other words, when the detachable thumb turn 51 is attached, the edge 43a of the operating member 39 enters the circumferential groove 59 of the detachable thumb turn shaft, and the falling of the removable thumb turn 51 is restricted.

  In the present embodiment, the marking member 47 has a pair of locking marking areas with the unlocking marking area interposed therebetween. Therefore, from the state in which the unlocking indication area is indicated on the state display window 31b of the decorative ring 31, the unlocking indication area can be indicated even if the removable thumb turn 51 is rotated in either the right or left rotation direction. It becomes. Thereby, the crime prevention thumb turn 100 can be applied to any right hand or left hand difference.

Next, the operation of the security thumb turn having the above configuration will be described.
FIG. 8 is a front view in the non-operating state of the operating member when the detachable thumb turn is removed, FIG. 9 is a front view of the operating member pressing operation state when the detachable thumb turn is detached, and FIG. FIGS. 11 and 11 are front views of, for example, a locked state when the detachable thumb turn is mounted.
In the security thumb turn 100, the removable thumb turn 51 is detached from the makeup ring 31 when going out or sleeping. As shown in FIG. 9, the attachment / detachment can be performed by pressing the operation member 39 upward to remove the edge 43a of the operation member 39 from the circumferential groove 59 of the attachment / detachment shaft 51a. That is, the operation member 39 is pressed with one finger, and the removable thumb turn 51 is detached with the other finger. This prevents unauthorized unlocking by hooking the inserted wire, bar or the like on the thumb turn and rotating the thumb turn.

  Further, when the outdoor cylinder unit is rotated by the combined key in the state where the detachable thumb turn 51 is detached, the lock indication area or the unlock indication area of the indication member 47 driven by the thumb turn shaft 23 is indicated on the state display window 31b. Thus, even when the removable thumb turn 51 is removed and the orientation / state of the knob 51b is not visible, the locking / unlocking state of the locking mechanism 15 can be grasped.

  On the other hand, to attach the detachable thumbturn 51, the operating member 39 is pressed with one hand, and the detachable shaft 51a of the detachable thumbturn 51 held by the other hand is inserted with the exposed hole 35 opened. After the insertion, by releasing the pressing of the operating member 39, the operating member 39 slides downward by the biasing force of the coil spring 41, the edge 43a engages with the circumferential groove 59, and the removable thumb turn 51 is dropped. Is regulated. At this time, the removable thumb turn 51 is mounted by the rotation direction restricting means 53 in a rotation direction that matches the locked / unlocked state of the thumb turn shaft 23. That is, when the thumb turn shaft 23 is unlocked, the knob 51b can be mounted only in the vertical state as shown in FIG. 10, and in the locked state, the knob 51b is mounted only in the horizontal state as shown in FIG. It becomes possible. The orientation of the knob 51b at the time of mounting can be determined from the area of the marking member 47 that is displayed on the state display window 31b.

  Therefore, according to the crime prevention thumb turn 100, the thumb ring shaft 23 having one end connected to the locking mechanism 15 and having the attachment / detachment hole 25 on the other end face is shown in the state where the attachment / detachment hole 25 is exposed through the exposure hole 35. The operating ring 39 is provided on the decorative ring 31 so as to cover or fully open at least a part of the exposed hole 35, and further, the locking indication area or the unlocking indication area is formed on the decorative ring 31 by meshing with the thumb turn shaft 23. The detachable thumb turn 51 has a marking member 47 that is exposed from the state display window 31b and is detachably attached to the detachable hole 25 at a predetermined rotation angle corresponding to the rotation angle of the thumb turn shaft 23. By removing and attaching, when you go out or go to bed, etc., you can hook the inserted wire or stick to the thumb turn and unlock it by rotating the thumb turn. You can stop, thereby improving the crime prevention.

  When the detachable thumb turn 51 is mounted, the detachable thumb turn 51 can be mounted in a rotational direction that matches the locked / unlocked state of the thumb turn shaft 23. Thereby, the locking / unlocking state of the locking mechanism 15 can be easily visually recognized by the vertical or horizontal posture of the knob 51b.

  In addition, since the removable thumb turn 51 has the same appearance as a normal thumb turn having a plate-shaped knob 51b at the base end, even when the removable thumb turn 51 is still attached, a feeling of use that is not incongruous with a normal thumb turn is provided. Obtainable.

  Furthermore, since the marking member 47 interlocked with the thumb-turn shaft 23 can display the locking marking area or the unlocking marking area according to the unlocking / unlocking state from the state display window 31b of the decorative ring 31, the detachable thumb turn 51 is detached and attached. Even when the knob 51b cannot be visually recognized, the locking / unlocking state of the locking mechanism 15 can be easily grasped from the state display window 31b.

  Further, since the operation member 39 is disposed at a sliding position that covers at least a part of the attachment / detachment hole 25 by the coil spring 41, the exposed hole 35 of the decorative ring 31 is covered by the operation member 39 when the attachment / detachment thumb turn 51 is attached / detached. In other words, it is difficult to illegally rotate the thumb turn shaft 23 by inserting a rod or the like into the attachment / detachment hole 25, and the crime prevention performance can be improved.

  Further, since the thumb turn shaft 23, the operation member 39, the marking member 47, the coil spring 41 and the like are accommodated in the gap between the base 17 and the bracket 29, the decorative ring 31 can be formed thin, and the protruding length from the door surface 11a is short. The good-looking crime prevention thumb turn 100 can be obtained. Furthermore, it is also possible to replace an existing thumb turn, and a thumb turn with crime prevention can be installed later.

It is a longitudinal cross-sectional view of the crime prevention thumb turn which concerns on this invention. It is a cross-sectional view of the crime prevention thumb turn which concerns on this invention. It is a front view of the state which removed the cosmetic ring of the security thumb turn shown in FIG. FIG. 2 is an exploded side view of the security thumb turn shown in FIG. 1. FIG. 3 is an exploded plan view of the security thumb turn shown in FIG. 2. It is a disassembled perspective view of the crime prevention thumb turn shown in FIG. It is a longitudinal cross-sectional view of a detachable thumb turn. It is a front view in the operation member non-operation state at the time of attachment / detachment thumb turn attachment / detachment. It is a front view in the operation member press operation state at the time of detachable thumb turn removal | desorption. It is a front view of the unlocking state at the time of detachable thumb turn mounting. It is a front view of the locked state, for example at the time of detachable thumb turn mounting.

Explanation of symbols

DESCRIPTION OF SYMBOLS 13 ... Lock box 15 ... Locking mechanism 23 ... Thumb turn shaft 25 ... Removable hole 31 ... Cosmetic ring 31b ... Status display window 35 ... Display hole 39 ... Operation member 41 ... Energizing means (coil spring)
43a ... Edge of operation member 47 ... Marking member 49 ... Marking area 51 ... Removable thumb 51a ... Removable shaft 51b ... Knob 53 ... Rotation direction restricting means 55 ... Fitting shaft 57 ... Fitting hole 59 ... Circumferential groove 100 ... Crime prevention Thumb turn

Claims (5)

A thumb turn shaft having one end connected to a locking mechanism in the lock box and having a detachable hole in the other end surface;
A decorative ring having an exposed hole for exposing the other end surface and covering the thumb turn shaft;
An operation member that is slidably provided in the decorative ring and covers or fully opens at least a part of the exposed hole by a sliding position;
A marking member that causes the locking marking area or the unlocking marking area to be exposed from the state display window of the decorative ring by interlocking with the thumb turn shaft;
A detachable shaft that is detachably attached to the detachable hole at a predetermined rotation angle corresponding to the rotation angle of the thumb turn shaft by a rotation direction restricting means provided between the detachable hole and the detachable shaft. A removable thumb turn with a plate-shaped knob fixed to the base end in parallel with the axis,
Equipped with,
The attachment / detachment hole is formed of a substantially square hole;
The tip of the detachable shaft is formed of a square pole that fits into the detachable hole,
A cylindrical fitting shaft protrudes from the center of each of the substantially square holes of the attachment / detachment hole,
A fitting hole for fitting to the fitting shaft is formed at the tip of the detachable shaft,
The rotation direction restricting means includes a protrusion projecting on two outer surfaces of the attachment / detachment shaft and a notch formed on two inner surfaces facing the attachment / detachment hole, and the protrusion enters the notch. The attachment hole and the attachment shaft fit together,
A crime prevention thumb turn characterized in that it can be attached in a rotational orientation that matches the locking and unlocking state of the thumb turn shaft when the removable thumb turn is attached . The crime prevention thumb turn according to claim 1 , wherein the marking member has a pair of locking marking areas across the unlocking marking area . In the mounted state of the detachable thumb turn, the edge of the operation member enters a circumferential groove formed in the shaft portion of the detachable thumb turn, and the removal of the detachable thumb turn from the detachable hole is restricted. The crime prevention thumb turn according to claim 1 or 2. 4. The security thumb turn according to claim 1 , wherein the operation member is disposed at a sliding position that covers at least a part of the attachment / detachment hole by an urging means . 5. 5. A thumb turn gear is formed on an outer periphery of the thumb turn shaft, and a tooth portion is formed on the indicating member, and the thumb turn shaft meshes and interlocks with each other . Security thumb turn described in one.

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