JP2005054455A - Crime prevention thumb-turn - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a crime prevention thumb-turn capable of preventing a thumb-turn knob from being illegally unlocked by inserting a wire or rod and hooking it on the knob or pushing it and having a favorable operability similar to a general thumb-turn. <P>SOLUTION: The prime prevention thumb-turn 100 is provided with a fixed cylinder 21 fixed to the indoor side face of a door, a thumb-turn core 45 having a cup part 53 which is freely rotatable in the inside of the fixed cylinder 21 and freely movable in the axial line and further, internally provided in the state of being capable of being offset eccentrically, a frame-shaped knob 67 having a frame part 71 protruding to the indoor side, a pair of side taper groove 55 and a bottom taper groove 59 formed in the cup part 53, a pair of shaking knob plate 75 having an engaging leg 83 to be freely shakable supported to the frame-shaped knob 67 engaging with the side tapered groove 55 and the bottom tapered groove 59, and a knob spring 91 releasing the engagement of the engaging leg 83 against the side tapered groove 55 by urging the knob 81 of a pair of shaking knob plates 75 in the separating direction. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a crime prevention thumb turn that improves or prevents crime prevention by enabling or disabling the rotational operation force of a thumb turn used for door locking / unlocking operation.

  Generally, a lock box is provided at the entrance door of a house or apartment, or the entrance door of an office. The lock box engages and disengages a dead bolt that has been advanced or retracted from the door mouth to release the door. Built-in locking / unlocking mechanism. This lock box is connected to a door-side cylinder lock and a door indoor-side thumb turn, and is unlocked and unlocked from the outdoor side by inputting a cylinder-lock locking / unlocking operation force, and from the indoor side a thumb-turn locking / unlocking operation force. . That is, an operation with a cylinder lock key is required from the outdoor side, while a lock operation can be simply performed by a rotation operation using only a thumb turn without using a key 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 and unlocking mechanism. Locking is easily possible.

  However, in recent years, there has been an increase in unauthorized unlocking that unlocks locking devices by inserting a rod or wire from a post hole or a small hole opened by a machine tool, and hooking or pushing on a thumb turn that is easy to rotate. 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 crime prevention cover has a fitting hole into which the thumb turn is fitted, and a portion covering the outer surface of the thumb turn which draws a circular locus when rotating is formed in a circular shape along the circular locus. A set screw is provided which is screwed into the fitting hole and abuts against the side surface of the thumb turn and is clamped from both sides. The security cover having such a configuration inserts a thumb turn into the insertion hole and covers the security cover so as to cover the thumb turn. Then, the security cover is fixed to the thumb turn by tightening the 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 attaching part and the main-body part is disclosed as another aspect of an above-described security cover. The mounting portion is formed so that the outer shape of the security cover is easily operated by hand, and is provided with a locking projection that is locked by the main body. The attachment portion can easily rotate the thumb turn in a state where it is put on the thumb turn. Moreover, the main-body part has the latching | locking part which can be latched by the latching protrusion. By doing in this way, a crime prevention cover can be attached or detached by a simple operation called a locking operation. Furthermore, when the main body portion idles at the locking portion, it becomes impossible to lock and rotate the wire or the like.
Japanese Patent Publication No. 2-157715 (Fig. 1b, Fig. 1c) Japanese Utility Model Publication No. 4-40362

However, since the above-described conventional crime prevention cover has a cylindrical shape, the conventional picking operation cannot be performed, and the operability is lowered. There is a problem that the locked state or the unlocked state of the thumb turn that can be visually recognized depending on the position is made invisible, and this also deteriorates the operability of locking and unlocking.
In addition, 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 the 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 can prevent illegal unlocking of the thumb turn by hooking or pushing the inserted wire or bar to the knob, and can perform the same good operation as a general thumb turn. As with normal thumbturns, it can be secured, and a security thumbturn that makes it easy to see the unlocked and unlocked state can be obtained from the vertical and horizontal postures of the knob, improving the security without sacrificing thumbturn operability. The purpose is to plan.

Next, means for solving the above problems will be described with reference to the drawings corresponding to the embodiments.
The security thumb turn 100 according to claim 1 of the present invention includes a fixed cylinder 21 fixed to an indoor side surface of a door provided with a lock box,
The fixed cylinder 21 is rotatable and movable in the axial direction, and is provided in an eccentric manner so that the distal end is engaged with the locking / unlocking mechanism 63 of the lock box, and the bottomed cylindrical cup is provided at the base end. A thumb turn core 45 having 53;
A core spring 65 that urges the thumb turn core 45 toward the proximal end to hold the posture on the axis of the fixed cylinder 21;
A frame-shaped knob 67 having a frame portion 71 that is rotatably provided on the proximal end side of the fixed cylinder 21 and protrudes indoors;
A pair of side taper grooves 55 formed on opposite surfaces across the axis of the cup portion 53 and extending along the axis while the groove cross-sectional shape widens toward the groove opening side;
A bottom taper groove 59 formed in a diametrical direction on the bottom surface 57 of the cup portion 53 to connect the pair of side taper grooves 55 and the groove cross-sectional shape widens toward the groove opening side;
It has a knob part 81 supported at the frame-like knob 67 so as to be swingable and swings inside the frame part 71 at the base end, and engages with the side taper groove 55 and the bottom taper groove 59 of the cup part 53. A pair of swing knobs 75 having engaging legs 83 at their tips;
A knob spring 91 that releases the engagement of the engagement leg 83 with the side taper groove 55 by urging the knob 81 of the pair of swing knobs 75 in the separating direction;
It is characterized by comprising.

  In this crime prevention thumb turn 100, the pair of swinging knob plates 75 are normally arranged apart from each other by the urging force of the knob spring 91, and as a result, the respective engagement legs 83 are separated from the side taper grooves 55 of the cup portion 53. It is arranged to come off. Therefore, if an illegal operation such as hooking and turning the frame knob with a wire or pushing and turning the frame knob 67 with a rod is performed, the bottom taper groove 59 receives the reaction force from the engaging leg 83 and receives the reaction force from the distal end side. The engagement leg 83 is disengaged from the bottom taper groove 59, and only idles inside the cup portion 53. Thereby, the rotation of the frame-shaped knob 67 is not transmitted to the thumb turn core 45, and the unlocking operation becomes impossible. Further, when only one swinging knob 75 is swung by a wire or a bar and the frame-shaped knob 67 is improperly operated, only one swinging engaging leg 83 is engaged with the side taper groove 55. However, when the frame-shaped knob 67 is rotated in this state, the side taper groove 55 of the cup portion 53 receives the reaction force from the engagement leg 83, the thumb turn core 45 is eccentric (tilted), and the engagement leg 83 comes out of the side taper groove 55 and the bottom taper groove 59. As a result, similarly to the above, the engagement leg 83 only idles inside the cup portion 53, the rotation of the frame-shaped knob 67 is not transmitted to the thumb turn core 45, and the unlocking operation becomes impossible.

  On the other hand, during normal operation, when the knob portion of the pair of swing knob plates 75 is rotated from both sides, the pair of engaging legs 83 are opened and simultaneously engaged with the pair of side taper grooves 55. That is, the pair of engaging legs 83 are engaged with the side taper groove 55 in a stretched state inside the cup portion 53, the thumb turn core 45 is not eccentric, and the engaging legs 83 and the thumb turn core 45 Are connected to each other so as to be integrally rotatable. Therefore, the operation is the same as that of a general thumb turn in which the swinging picking plate 75 is picked and turned, and the same operability as in the prior art is ensured. Further, at the time of the locking / unlocking operation from the outdoor side, the tips of the pair of engaging legs 83 are engaged with the bottom tapered groove 59 of the cup portion 53. Therefore, when the thumb turn core 45 rotates in conjunction with the keying operation, the engaging legs The frame-shaped knob 67 is rotated through 83, and the locked / unlocked state can be easily visually recognized from the indoor side as in the case of a general thumb turn. Further, after the unauthorized unlocking operation is performed, even if the relative rotation position between the frame-shaped knob 67 and the thumb turn core 45 is shifted, if the frame-shaped knob 67 is appropriately rotated, the engagement leg 83 and the side taper The groove 55 and the bottom taper groove 59 are fitted again to easily return to the restored state, and the locked / unlocked state can be visually recognized again.

  According to the security thumb turn according to the present invention, the pair of swing knob plates are arranged so that the respective engaging legs are separated from the side taper grooves of the cup portion by the biasing force of the knob spring. Even if an improper operation such as hooking and turning the knob or pushing the frame-shaped knob with a stick is performed, the engaging leg is detached from the bottom taper groove and only idles inside the cup portion. As a result, the rotation of the frame knob is not transmitted to the thumb turn core, and the unlocking operation is disabled. In addition, when only one swinging knob plate is swung by a wire or a bar and the frame-shaped knob is tampered with, only one swung engaging leg engages with the side taper groove. When the frame-shaped knob is rotated, the side taper groove of the cup portion receives a reaction force from the engagement leg, the thumb turn core is eccentric, and the engagement leg is detached from the side taper groove. As a result, similarly to the above, the engaging leg is idled inside the cup portion, the rotation of the frame-shaped knob is not transmitted to the thumb turn core, and the unlocking operation becomes impossible.

  On the other hand, during normal operation, the operation is the same as that of a general thumb turn that is rotated while picking the knob portion of the swing knob plate, and the same operability as before can be ensured. In addition, at the time of locking / unlocking operation from the outdoor side, the tips of the pair of engaging legs are engaged with the bottom tapered groove of the cup portion, so that the frame-shaped knob rotates in conjunction with the key-locking operation. As with the thumb turn, the locked / unlocked state can be easily seen from the indoor side.

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 an exploded side view in which a part of a security thumb turn according to the present invention is cut away, FIG. 2 is an exploded perspective view of a frame-shaped knob, a swing knob plate and a thumb turn core, and FIG. 3A is a front view of a cup portion. FIG. 4B is a side view with a part cut away, FIG. 4C is an explanatory view of a thumb turn core showing a side view in a state rotated 90 degrees, FIG. 4A is a side view, and FIG. FIG. 5C is an explanatory view of the swing knob plate showing the front view in FIG. 5A. FIG. 5A is a longitudinal sectional view of the security thumb turn in a normal state with the engaging legs closed, and FIG. 5B is a front view of the cup portion. FIG. 6 is a configuration diagram showing a cross-sectional view of a cross section orthogonal to FIG. 5, and FIG. 6B is a configuration diagram showing a front view of the cup portion.

  A lock box is provided on a door (not shown) to which the security thumb turn 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 deadbolt of the lock box is a thumb turn knob (hereinafter also referred to as a “frame-shaped knob”) that is provided on the indoor side surface of the door with a cylinder lock provided on the outdoor side surface of the door. By rotating, it is possible to advance and retreat from the mouth of the door. .

  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. In the following description, for convenience of explanation, the lock box side of the security thumb turn 100 will be described as the front end side, and the indoor side of the security thumb turn 100 will be described as the base end side.

  A retaining ring 27 is disposed on the proximal end surface of the fixed cylinder 21, and the retaining ring 27 is held by a spacer ring 29 that is externally inserted to the proximal end of the fixed cylinder 21. The retaining ring 27 is fixed by covering the outer periphery of the spacer ring 29 with a decorative cylinder 33 having a central hole 31. A conical decorative ring 35 having a flat base end is externally mounted on the base end portion of the fixed cylinder 21 on the outer peripheral side of the decorative cylinder 33. In the decorative ring 35, the tip edge 35 b is pressed against the indoor surface of the door by the urging force of a spring 37 disposed between the bent portion 35 a at the tip and the tip surface of the decorative tube 33.

  On the inside of the distal end side of the fixed cylinder 21, a collar portion 43 having an insertion hole 41 is protruded. The thumb turn core 45 is inserted into the insertion hole 41 of the flange portion 43. The thumb-turn core 45 is formed with an input / output portion 47 having a cross-shaped cross section that engages with the locking / unlocking mechanism of the lock box on the distal end side. A retaining groove 51 is formed on the outer periphery of the shaft portion 49 provided continuously with the input / output portion 47. A bottomed cylindrical cup portion 53 having a larger outer diameter than the shaft portion 49 is connected to the base end side of the shaft portion 49, and the base end surface of the cup portion 53 is opened.

  As shown in FIG. 3, a pair of side taper grooves 55, 55 are provided in the cup portion 53, which are formed on opposite sides of the axis and extend along the axis. The side taper grooves 55 and 55 have a groove cross-sectional shape that expands toward the groove opening side. A bottom taper groove 59 is formed in the diameter direction on the bottom surface 57 of the cup portion 53. The bottom taper groove 59 is a taper groove whose groove cross-sectional shape widens toward the groove opening side, and connects the pair of side taper grooves 55, 55. That is, a U-shaped groove is formed in the cup portion 53 over the inner peripheral surface and the bottom surface 57.

  The thumb turn core 45 is inserted into the flange portion 43 of the fixed cylinder 21 through the shaft portion 49, and the retaining ring 61 is fitted into the retaining groove 51 of the shaft portion 49 on the distal end side protruding from the flange portion 43. It is supported so as to be movable in the axial direction. The insertion hole 41 of the collar part 43 fits the thumb turn core 45 with play. As a result, the thumb turn core 45 can rotate and move in the axial direction inside the fixed cylinder 21 and can be eccentric (can be tilted with respect to the axis). The input / output part 47 of the thumb-turn core 45 is maintained in the engaged state with the locking / unlocking mechanism 63 (see FIG. 5) of the lock box even in the eccentric state.

  A core spring 65 is externally inserted into the shaft portion 49 between the flange portion 43 and the cup portion 53, and the core spring 65 biases the thumb turn core 45 toward the proximal end side. That is, the thumb turn core 45 can be pushed to the tip side.

  A frame-shaped knob 67 is rotatably attached to the proximal end side of the fixed cylinder 21. The frame-shaped knob 67 has a plurality of locking claws 69 on the distal end side, and the locking claws 69 are attached to the locking ring 27 so as to be rotatable and undetachable. The frame-shaped knob 67 is formed with a frame portion 71 projecting indoors, and the frame portion 71 is a rectangular through-hole penetrating in the vertical direction.

  A pair of shaft holes 73 are formed in the frame knob 67. The frame-shaped knob 67 holds a pair of swing knob plates 75 and 75 so as to freely swing. A shaft hole 77 is formed in a substantially central portion of each of the swing knobs 75 and 75, and the swing knobs 75 and 75 are inserted into the shaft holes 73 and 73 of the frame knob 67. By penetrating 79 through the shaft hole 77, the distal end side and the proximal end side can swing freely. The pair of swing knob plates 75 and 75 rotate integrally with the frame knob 67.

  As shown in FIG. 4, a rectangular plate-shaped knob portion 81 is formed on the base end side of the swing knob plates 75, 75, and the knob portion 81 can be moved up and down inside the frame portion 71 of the frame-shaped knob 67. Placed in. Engagement legs 83 are formed on the front ends of the swinging knobs 75 and 75, and the respective engagement legs 83 are disposed in the cup portion 53 of the thumb turn core 45. A side inclined surface 85 that is narrower toward the inner surface of the cup portion 53 is formed on the side portion of the engaging leg 83 that faces the inner surface of the cup portion 53. Further, a tip inclined surface 87 that is narrower toward the bottom surface 57 of the cup portion 53 is formed on the tip end side of the engagement leg 83.

  As shown in FIG. 5, the side inclined surface 85 can enter the side taper grooves 55 and 55 of the cup portion 53, and the tip inclined surface 87 enters the bottom taper groove 59 of the cup portion 53.

  Spring accommodating recesses 89 and 89 are formed on the opposing surface of the knob 81, and a knob spring 91 is fitted in the spring accommodating recesses 89 and 89. The knob spring 91 biases the pair of knobs 81 and 81 in the separating direction. As shown in FIGS. 5 and 6, the swinging leg plates 75 and 75, in which the knobs 81 and 81 are urged in the direction of separation by the knob spring 91, are moved in the approaching direction. 83, the side inclined surface 85 is in a state of being detached from the side tapered grooves 55, 55 of the cup portion 53. Even in this state, the tip inclined surface 87 of the engagement leg 83 engages with the bottom taper groove 59 of the cup portion 53 so that the rotational force from the locking / unlocking mechanism can be transmitted to the thumb turn core 45.

The operation of the security thumb turn 100 having such a configuration will be described.
FIG. 7 is an operation explanatory view showing a rotation start situation when the engaging leg is in a closed leg state, FIG. 8 is an operation explanatory view showing a situation where the engagement leg is removed from the bottom taper groove and the rotation is finished, and FIG. FIG. 10 is an operation explanatory diagram showing a situation in which only one of the swing knobs is rotated, and FIG. FIG. 12 is an operation explanatory diagram of a situation where the rotation is finished with the plate being oscillated, and FIG. 12 is an operation explanatory diagram of a situation where the pair of oscillating knobs are simultaneously oscillated.

  For example, when only the frame-shaped knob 67 is rotated, the crime prevention thumb turn 100 is configured such that the side inclined surface 85 of the engagement leg 83 is disengaged from the side taper grooves 55 and 55 of the cup portion 53 as shown in FIG. Since only the tip inclined surface 87 of the joint leg 83 enters the bottom taper groove 59 of the cup portion 53, the bottom taper groove 59 receives a reaction force from the tip inclined surface 87, and as shown in FIG. Is removed from the bottom taper groove 59, and the thumb turn core 45 is pushed toward the tip side against the biasing force of the core spring 65. As a result, the engaging leg 83 is idled while sliding on the inner peripheral surface of the cup portion 53.

  That is, the rotational operation force of the frame-shaped knob 67 is not transmitted to the thumb-turn core 45, and only the frame-shaped knob 67 is rotated to the state shown in FIG. In this state, the thumb turn core 45 is moved to the tip side by δ (see FIG. 8A).

  On the other hand, as shown in FIG. 9, when hooking or pushing is performed by a wire or a bar, only one swing knob 75 is swung, and only the swinging engagement leg 83 is swung. Enter the side taper groove 55. When a rotational moment is applied to the frame-shaped knob 67 in this state, the side taper groove 55 receives a reaction force from the engaging leg 83 in the engaged state, and the thumb turn core 45 is eccentric as shown in FIG. escape). As a result, the engaging leg 83 is disengaged from the side taper groove 55, rotates inside the cup portion 53, and slidably contacts the inner peripheral surface of the cup portion 53 as shown in FIG. However, it will only idle.

  In addition, as shown in FIG. 12, when the pair of swinging tabs 75 and 75 are picked from both sides by a regular turning operation, the pair of swinging tabs 75 and 75 are simultaneously swung, The side inclined surface 85 of the engaging leg 83 enters the pair of side tapered grooves 55 and 55 of the cup portion 53 substantially simultaneously, and the tip inclined surface 87 of the engaging leg 83 enters the bottom tapered groove 59 of the cup portion 53. It will be in the state. When the frame-shaped knob 67 is rotated in this state, the thumb-turn core 45 is rotated without being eccentric from the axis of the fixed cylinder 21, and the rotational force of the frame-shaped knob 67 is transmitted to the thumb-turn core 45. Become. As a result, the rotational operation force of the frame knob 67 is input to the lock / unlock mechanism 63 of the lock box via the thumb turn core 45, and the lock / unlock is enabled.

  Even if the relative rotational position of the frame-shaped knob 67 and the thumb turn core 45 is shifted after the unauthorized unlocking operation is performed, if the frame-shaped knob 67 is rotated appropriately, the engaging leg 83 and the side taper groove 55 And the bottom taper groove 59 is fitted again to easily return to the restored state, and the locked / unlocked state can be visually recognized again.

  Therefore, according to the crime prevention thumb turn 100, when an illegal operation such as hooking and turning the frame-shaped knob 67 with a wire or pushing and rotating the frame-shaped knob 67 with a rod is performed, the engaging leg 83 is moved to the bottom tapered groove 59. And only idle in the cup portion 53. Thereby, the rotation of the frame-shaped knob 67 is not transmitted to the thumb turn core 45, and the unlocking operation becomes impossible. Further, when only one swinging knob 75 is swung by a wire or a bar and the frame-shaped knob 67 is improperly operated, only one swinging engaging leg 83 is engaged with the side taper groove 55. However, when the frame-shaped knob 67 is rotated in this state, the side taper groove 55 of the cup portion 53 receives the reaction force from the engagement leg 83, the thumb turn core 45 is eccentric (tilted), and the engagement leg 83 comes out of the side taper groove 55 and the bottom taper groove 59. As a result, similarly to the above, the engagement leg 83 only idles inside the cup portion 53, the rotation of the frame-shaped knob 67 is not transmitted to the thumb turn core 45, and the unlocking operation becomes impossible.

  On the other hand, during normal operation, when the knob portion 81 of the pair of swing knob plates 75 is rotated from both sides, the pair of engagement legs 83 are opened and simultaneously engaged with the pair of side taper grooves 55. That is, the pair of engaging legs 83 are engaged with the side taper groove 55 in a stretched state inside the cup portion 53, the thumb turn core 45 is not eccentric, and the engaging legs 83 and the thumb turn core 45 Are connected to each other so as to be integrally rotatable. Therefore, the operation is the same as that of a general thumb turn that picks and turns the swing knob plates 75 and 75, and the same operability as in the prior art is ensured. Further, at the time of the locking / unlocking operation from the outdoor side, the tips of the pair of engaging legs 83 are engaged with the bottom tapered groove 59 of the cup portion 53. Therefore, when the thumb turn core 45 rotates in conjunction with the keying operation, the engaging legs The frame-shaped knob 67 is rotated through 83, and the locked / unlocked state can be easily visually recognized from the indoor side as in the case of a general thumb turn.

It is the disassembled side view which notched a part of crime prevention thumb turn which concerns on this invention. It is a disassembled perspective view of a frame-shaped knob, a rocking knob board, and a thumb turn core. (A) is a front view of a cup part, (b) is a side view with a part cut away, and (c) is an explanatory view of a thumb turn core showing a side view in a state rotated 90 degrees. (A) is a side view, (b) is a plan view, and (c) is an explanatory view of a swing knob plate that is viewed from the front. It is the block diagram which represented the longitudinal cross-sectional view of the crime prevention thumb turn in the normal state with which the engagement leg was closed, and (b) and the front view of the cup part. It is the block diagram which showed the cross-sectional view of the cross section orthogonal to FIG. 5 to (a), and the front view of the cup part was shown to (b). It is operation | movement explanatory drawing showing the rotation start condition in case an engagement leg is a closed leg state. It is operation | movement explanatory drawing showing the condition where the engagement leg remove | deviated from the bottom taper groove | channel and the rotation was complete | finished. It is operation | movement explanatory drawing showing the condition where only one rocking knob plate was rocked. It is operation | movement explanatory drawing of the condition where the frame shape knob was rotated in the state by which one rocking | fluctuation knob plate was rock | fluctuated. It is operation | movement explanatory drawing of the condition where rotation was complete | finished in the state by which one rocking | fluctuation knob plate was rock | fluctuated. It is operation | movement explanatory drawing of the condition where a pair of rocking knob board was rocked simultaneously.

Explanation of symbols

DESCRIPTION OF SYMBOLS 21 ... Fixed cylinder 45 ... Thumb turn core 53 ... Cup part 55 ... Side part taper groove 59 ... Bottom part taper groove 63 ... Locking and unlocking mechanism 65 ... Core spring 67 ... Frame-shaped knob 71 ... Frame part 75 ... Swing knob board 81 ... Knob part 83 ... engaging leg 91 ... pick spring 100 ... security thumb turn

Claims (1)

A fixed cylinder fixed to the indoor side surface of the door with the lock box;
The fixed cylinder has a bottomed cylindrical cup portion at the base end which is rotatably and axially movable and is provided in an eccentric manner so that the distal end is engaged with the locking / unlocking mechanism of the lock box. Sam turn core,
A core spring that biases the thumb-turn core toward the proximal end and holds the posture on the axis of the fixed cylinder;
A frame-shaped knob having a frame portion that is rotatably provided on the proximal end side of the fixed cylinder and protrudes indoors;
A pair of side taper grooves formed on opposite surfaces sandwiching the axis of the cup portion and extending along the axis while the groove cross-sectional shape widens toward the groove opening side;
A bottom taper groove formed in a diametrical direction on the bottom surface of the cup portion and connecting the pair of side taper grooves so that the groove cross-sectional shape widens toward the groove opening side;
The base has a knob that is swingably supported by the frame knob and swings inside the frame, and has an engagement leg at the tip that engages with the side taper groove and the bottom taper groove of the cup. A pair of swing knobs,
A knob spring that releases the engagement of the engagement leg with respect to the side taper groove by urging the knob of the pair of swing knobs in the separating direction;
Crime prevention thumb turn characterized by comprising.

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