JP4295577B2 - Security thumb turn - Google Patents

Description

  The present invention relates to a crime prevention thumb turn used for door unlocking / unlocking operation, and more particularly, a crime prevention thumb turn that prevents unauthorized unlocking operation force other than the thumb unlocking normal unlocking operation force from being transmitted to the lock box and enhances the crime prevention performance. About.

  Generally, a lock box is provided at the entrance door of a house or apartment, or the entrance door of an office. This lock box has a built-in locking / unlocking mechanism that locks and unlocks the door by engaging and disengaging the dead bolt that advances and retreats from the door mouth, and is connected to the cylinder lock on the door outdoor and the thumb turn on the indoor side. From the outdoor side, the locking / unlocking operation force is applied by a cylinder lock, and from the indoor side, the locking / unlocking operation force is input by a thumb turn. In other words, an operation with a key lock is required from the outdoor side, while it can be easily locked and unlocked by only thumb-turn knobs 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 performing forward and reverse rotation operation, 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, and the door Is easily locked and unlocked.

  However, in recent years, there has been an increase in unauthorized unlocking that unlocks the locking / unlocking mechanism 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 thumb-turn security cover disclosed in Patent Document 2 below to prevent such unauthorized unlocking.

  The security cover for thumb turn has a fitting hole into which the thumb turn is fitted, and an outer surface portion covering the thumb turn is formed in a circular shape along a circular locus. A set screw is provided on the side surface of the cover so as to be screwed into the fitting hole and to come into contact with the side surface of the thumb turn so as to sandwich the thumb turn 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. Accordingly, it is difficult to perform an unauthorized unlocking operation of the thumb turn that locks the wire or the like and pushes it around with the stick by 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 is idled by the locking portion, an unauthorized unlocking operation that locks the wire or the like or pushes it around with the rod becomes impossible.
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 outer shape, it cannot be easily rotated by a conventional finger and the operability is lowered. In addition, when it is put on an existing thumb turn, it is originally an oval shape, and the locked or unlocked state of the thumb turn that can be visually recognized depending on the rotational position becomes invisible, and erroneous operation is likely to occur, which also reduces operability. I let you.
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 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. Provides a security thumb turn that can be easily seen in the locked and unlocked state from the vertical and horizontal position of the knob as in the case of a general thumb turn, thus improving the security while ensuring the operability of the thumb turn. It aims to plan.

Next, means for solving the above problems will be described with reference to the drawings corresponding to the embodiments.
The crime prevention thumb turn 100 according to claim 1 of the present invention is attached to a door 35 provided with a lock box, and a fixed cylinder 21 having locking recesses 37 formed at both ends in the diameter direction of the inner peripheral surface 35a;
A thumb turn shaft 45 which is coaxially and rotatably provided in the fixed cylinder 21 and has one end connected to the locking / unlocking mechanism 51 of the lock box;
A guide groove 61 formed in a diameter direction on the end face of the other end side of the thumb turn shaft 45;
The guide spring 61 is housed in the guide groove 61 and slides outward in the radial direction of the end face to enter the locking recess 37 of the fixed cylinder 21 to prevent the rotation of the thumb turn shaft 45 and to stretch the tension springs. A pair of stoppers 63, 63 biased in the approaching direction by 71;
A rotating shaft 83 that is exposed to the indoor side and is divided into two across the axis of the thumb turn shaft 45 and is parallel to the axis of the thumb turn shaft 45 is fixed to each end surface and supported on the end face via the rotating shaft 83. A pair of wing knobs 81, 81,
The tip portions 85a and 85a fixed to the tips of the rotary shafts 83 of the wing-shaped knobs 81 and 81 and extending outward in the radial direction of the rotary shafts 83 overlap with each other in the axial direction of the thumb turn shaft 45. A pair of pressing arms 85, 85 sandwiched between the pair of stoppers 63, 63 in a state;
It is characterized by comprising.

In this crime prevention thumb turn 100, the wing-shaped knobs 81, 81 divided into two parts are simultaneously rotated while being held in a straight posture, so that the thumb-turn knob 45 is connected to the thumb-turn shaft 45 via the rotating shafts 83, 83 of the blade-shaped knobs 81, 81. The rotational operation force is transmitted, and the unlocking operation can be performed without sliding the stoppers 63 and 63. On the other hand, when a moment is applied by hooking a wire to one of the two wing-shaped knobs 81, 81 or pushing it with a stick, only the wing-shaped knob 81 rotates with the rotating shaft 83, and this rotation. The pressing arm 85 fixed to the moving shaft 83 pushes one stopper 63 outward in the radial direction of the end face, and the stopper 63 enters the locking recess 37 of the fixed cylinder 21 and the unlocking operation becomes impossible. As a result, unauthorized unlocking other than the regular unlocking operation in which the pair of knobs 81 and 81 are simultaneously rotated becomes impossible, and the crime prevention property is improved.
Further, since the stoppers 63, 63 do not face the locking recesses 37, 37 during the locking operation, that is, the locking recesses 37 are disposed only corresponding to the stoppers 63 in the locked state. Therefore, even if only one of the wing knobs 81, 81 is turned, the stoppers 63, 63 do not enter the locking recesses 37, 37, and can be locked, thereby ensuring good operability. At a normal time when the operating force does not act, the pair of pressing arms 85, 85 are sandwiched between the pair of stoppers 63, 63, and the urging force of the tension spring 71 is applied to the wing knobs 81, 81 via the rotation shaft 83. The pair of wing knobs 81 and 81 are held in a straight line via the rotation shaft 83. Thereby, the locked / unlocked state can be easily visually recognized from the indoor side, and good operability without erroneous operation is ensured.

According to the security thumb turn according to the present invention, by simultaneously rotating the wing-shaped knob divided into two in a straight posture, the rotational operation force can be transmitted to the thumb-turn shaft via the rotation axis of the wing-shaped knob, and the stopper is The unlocking operation can be performed without sliding. On the other hand, when a moment is applied by hooking a wire to one of the two wing-shaped knobs or pushing it with a stick, the rotating shaft rotates with the wing-shaped knob, and the pressing arm fixed to the rotating shaft One stopper is pushed outward in the radial direction of the end face, the stopper enters the locking recess, and the rotation of the thumb turn shaft with respect to the fixed cylinder becomes impossible, and the unlocking operation becomes impossible. As a result, crime prevention can be improved.
In addition, since the stopper does not face the locking recess during the locking operation, the locking can be performed even if only one wing-shaped knob is rotated, and good operability can be ensured. In normal times when the operating force does not act, the pair of pressing arms are sandwiched between the pair of stoppers, so that the pair of wing knobs are held in a straight line via the rotating shaft, and like a plate-shaped thumb turn. The locked and unlocked state can be easily visually recognized 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 view of a security thumb turn according to the present invention in a locked state and is cut in a horizontal plane. FIG. 2 is a perspective view of a main part of the security thumb turn according to the present invention in a locked state. FIG. 3 is a security view shown in FIG. It is explanatory drawing which represented the assembly | attachment state of the thumb turn to (a) and the front view which looked through the inside from the indoor side to (b). In the present specification, for convenience of explanation, the lock box side of the security thumb turn will be described as one end side, and the indoor side of the security thumb turn will be described as the other end side.

  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 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 also referred to as “wing-shaped knob”) provided on the indoor side of the door. By moving, it is possible to advance and retreat from the doorhole.

  A fixed cylinder 21 is fixed to the door or the lock box. A pair of fixing portions 23 and 23 shown in FIG. 3B project vertically on the outer periphery of the fixing cylinder 21 at one end in the axial direction, and the fixing portions 23 and 23 have fixing holes (not shown). The fixed cylinder 21 is fixed to a lock box provided in the door through this fixing hole.

  A decorative cylinder 27 having a central hole 25 is placed on the outer periphery on the other end side of the fixed cylinder 21, and is screwed to the fixed cylinder 21 by a pair of screws 29 and 29. On the other end side of the fixed cylinder 21 which is the outer peripheral side of the decorative cylinder 27, a decorative ring 31 having a substantially truncated cone shape whose other end side is flat is mounted. The decorative ring 31 has the one end 31b on the indoor side of the door 35 shown in FIG. It is pressed against the surface 35a.

  Both ends of the fixed cylinder 21 are opened in the axial direction, and one end side is fixed to the lock box, so that the other end side protrudes indoors. The outer periphery of the protruding portion is covered with the decorative ring 31 described above. On the inner peripheral surface on the other end side of the fixed cylinder 21, locking recesses 37 are formed at both ends in the diameter direction. In the present embodiment, the locking recesses 37 at the both ends in the diameter direction are provided on the top surface side and the bottom surface side of the inner peripheral surface of the fixed cylinder 21. Therefore, in FIG. 1 having a horizontal cross section, only the bottom-side locking recess 37 is shown.

  A flange portion 41 having a through hole 39 is formed inside the fixed cylinder 21. The flange portion 41 is inserted through a thumb turn shaft 45 having a disc portion 43 on the other end side. The thumb turn shaft 45 is inserted and supported by the flange portion 41, so that the thumb turn shaft 45 is rotatable coaxially with the fixed cylinder 21. In the present embodiment, a connecting shaft 47 having a connecting protrusion 47 a having a cross-shaped cross section at the tip is integrally fitted and fixed to one end side of the thumb turn shaft 45 via a fixing pin 49. The thumb turn shaft 45 is connected to the locking / unlocking mechanism 51 of the lock box shown in FIG.

  In the thumb turn shaft 45, a stop ring 55 is engaged with a circumferential groove 53 formed on the outer peripheral surface on one end side of the flange portion 41, and a washer is provided between the stop ring 55 and the step portion 57 of the fixed cylinder 21. 59 is arranged, and the movement in the axial direction is restricted, and it is attached to the inside of the fixed cylinder 21.

  A guide groove 61 is formed in the diametrical direction on the end face on the other end side of the disc portion 43 provided continuously to the other end side of the thumb turn shaft 45. A pair of stoppers 63, 63 are accommodated in the guide groove 61, and the stoppers 63, 63 enter the locking recesses 37 of the fixed cylinder 21 by sliding outward in the radial direction of the disk portion 43. Thus, the rotation of the thumb turn shaft 45 can be prevented.

  A slide pin 65 protrudes from the surface on one end side of the stoppers 63, 63, and the slide pin 65 is inserted into an elongated hole 67 provided in the groove bottom of the guide groove 61 to guide the slide. The stopper 63 is provided with a latching protrusion 69, and a tension spring 71 is stretched between the latching protrusions 69, 69, and the pair of stoppers 63, 63 are urged radially inward. That is, normally, it protrudes outward from the disk part 43 and is not locked to the locking recesses 37.

  A cover member 73 having the same outer diameter is fixed to the disc portion 43 on the other end surface of the disc portion 43 by screws (not shown) inserted through a plurality of screw holes 75. A longitudinal groove 77 for accommodating the tension spring 71 is formed in the cover member 73. A pair of bearing holes 79 are formed in the cover member 73 with a vertical groove 77 interposed therebetween.

  In the security thumb turn 100, a pair of wing knobs 81, 81 which are divided into two with the axis of the thumb turn shaft 45 sandwiched therebetween are exposed on the indoor side. Rotating shafts 83, 83 are fixed to the wing-shaped knobs 81, 81 in the same direction as the axis of the thumb turn shaft 45, and the rotating shafts 83, 83 are freely rotatable in bearing holes 79, 79 of the cover member 73. Is inserted. In other words, the pair of wing knobs 81 and 81 are supported on the end surface on the other end side of the thumb turn shaft 45 via the rotation shafts 83 and 83 and the cover member 73.

  On one end side of each of the rotation shafts 83 and 83, pressing arms 85 and 85 extending outward in the radial direction of the rotation shafts 83 and 83 are fixed. Each of the pressing arms 85 and 85 is housed in a swingable manner in a slot-like housing part 87 formed on the end face on the other end side of the disc part 43. The pressing arms 85 and 85 are formed in a substantially dharma shape in which a small arc portion and a large arc portion are continuously provided, and the tip portions 85 a and 85 a that are small arc portions are overlapped with each other in the axial direction of the thumb turn shaft 45. It is clamped between a pair of stoppers 63, 63.

  The pair of wing-shaped knobs 81 and 81 are held in a straight line by holding the tip portions 85 a and 85 a of the pressing arms 85 and 85 between the stoppers 63 and 63. On the other hand, the wing knobs 81, 81 held in a straight line shape rotate about the rotation shaft 83 and press the stopper 63 via the pressing arm 85 when an external force is applied to either of them. It has become.

Next, the action of the security thumb turn configured as described above will be described.
FIG. 4 is a front view of the security thumb turn according to the present invention seen through from the indoor side during an unauthorized unlocking operation.
In the security thumb turn 100, in the locked state, that is, in the state where the wing-shaped knobs 81, 81 are in the horizontal position, as shown in FIG. 3B, the guide groove 61 of the disc portion 43 extends in the vertical direction. To be arranged.

In this locked state, for example, when a wire or a rod is inserted on the indoor side and an external force is applied to the wing knob 81 on one side, the wing knob 81 (on the right side in FIG. 4), as shown in FIG. It is rotated around the rotation shaft 83 and is in a folded state.
Along with this, the distal end portion 85a of the pressing arm 85 fixed to the rotating shaft 83 presses one stopper 63, in the illustrated example, the upper stopper 63 radially outward (upward).
The pressed stopper 63 protrudes outward from the disc portion 43 and enters the locking recess 37 on the top surface side of the fixed cylinder 21.
Therefore, in this state, the disk portion 43 of the thumb turn shaft 45 and the fixed cylinder 21 are locked by the stopper 63, and the thumb turn knob (wing-like knobs 81 and 81) is prevented from transmitting the rotation operation force. Is done.

  On the other hand, according to the normal unlocking operation in which the pair of wing knobs 81 and 81 are simultaneously picked and rotated, the same amount of reverse moment with the axis line symmetrical with respect to the thumb turn shaft 45 is applied. The rotation operation force by the thumb turn knob (wing-like knobs 81, 81) is transmitted to the thumb turn shaft 45 without protruding 63.

  Further, when the locking operation is performed in the unlocked state, even if only one of the wing knobs 81 is rotated, the guide groove 61 is disposed in the horizontal direction, so that it corresponds to the inner peripheral surface of the fixed cylinder 21. There are no locking recesses 37 in the position, and the thumb turn shaft 45 can be rotated without the stopper 6 being locked.

  Therefore, according to the security thumb turn 100, when a moment is applied to one of the wing-shaped tabs 81, 81 divided into two parts, when the wire is hooked or pushed around with a stick, only the wing-shaped tab 81 rotates. The pressing arm 85, which rotates together with the shaft 83 and is fixed to the rotating shaft 83, pushes one stopper 63 and enters the locking recess 37 of the fixed cylinder 21, so that the unlocking operation becomes impossible. As a result, unauthorized unlocking other than the regular unlocking operation in which a pair of knobs are turned simultaneously is disabled, and crime prevention is improved.

  In addition, since the stopper 63 does not face the locking recess 37 during the locking operation, that is, the locking recess 37 is disposed only corresponding to the stopper 63 in the locked position. Even if only one of the wing-shaped knobs 81 is rotated, the stopper 63 does not enter the locking recess 37 and can be locked, and good operability is ensured. At a normal time when the operating force does not act, the pair of pressing arms 85 and 85 are sandwiched between the pair of stoppers 63 and 63, and the urging force of the tension spring 71 is transmitted through the rotary shafts 83 and 83. A pair of wing knobs 81, 81 are held in a straight line through the rotation shafts 83, 83 over 81. As a result, similarly to a general wing plate-shaped thumb turn, the locked / unlocked state can be easily seen from the indoor side, and good operability with no erroneous operation is ensured.

  In the above-described embodiment, the shape of the wing knob 81 having an arcuate outer corner has been described as an example. However, the shape of the wing knob 81 is not limited to this, and other than this, It may be a shape, a triangle shape, a fan shape, or the like.

It is the exploded view which made the cross section by the horizontal surface in the locked state the crime prevention thumb turn which concerns on this invention. It is the principal part perspective view which decomposed | disassembled the crime prevention thumb turn which concerns on this invention in the locked state. It is explanatory drawing which represented the assembly | attachment state of the security thumb turn shown in FIG. 1 to (a), and the front view which looked through the inside from the indoor side was represented to (b). It is the front view which saw through the inside from the indoor side at the time of fraudulent unlocking operation | movement of the crime prevention thumb turn concerning this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 21 ... Fixed cylinder 35 ... Door 35a ... Inner peripheral surface 37 ... Locking recessed part 45 ... Thumb turn shaft 51 ... Locking / unlocking mechanism 61 ... Guide groove 63 ... Stopper 71 ... Tension spring 81 ... Wing-shaped knob 83 ... Rotating shaft 85 ... Pressing arm 85a ... tip 100 ... crime prevention thumb turn

Claims (1)

A fixed cylinder attached to a door provided with a lock box and having locking recesses formed at both ends in the diameter direction of the inner peripheral surface;
A thumb-turn shaft that is coaxially and rotatably installed in the fixed cylinder and has one end connected to the locking and unlocking mechanism of the lock box;
A guide groove formed in a diametrical direction on an end face on the other end side of the thumb turn shaft;
The guide groove is accommodated in the guide groove so as to slide radially outward of the end face to enter the locking recess of the fixed cylinder to prevent the rotation of the thumb turn shaft, and in the approaching direction by tension springs stretched together. A pair of biased stoppers;
A pair of shafts that are exposed to the indoor side and are divided into two across the axis of the thumb turn shaft, and a rotation shaft parallel to the axis of the thumb turn shaft is fixed to each other and supported by the end face via the rotation shaft. Wing picking,
Between the pair of stoppers in a state where tip portions fixed to the tip of the rotating shaft of each wing-shaped knob and extending outward in the radial direction of the rotating shaft overlap with each other in the axial direction of the thumb turn shaft. A pair of pressing arms sandwiched between,
Crime prevention thumb turn characterized by comprising.

Images