JP4343679B2 - Security thumb turn - Google Patents

Description

  The present invention relates to a crime prevention thumb turn that prevents an unauthorized unlocking operation by restricting the rotation of a knob projected on an indoor surface of a door.

  A lock box is provided at the entrance door provided in an apartment or house, 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, unauthorized unlocking that unlocks the locking device by inserting a rod or wire from a small hole opened in a door or the like by a post port or a machine tool, and locking and rotating it with a thumb turn that is easy to rotate. Is increasing. 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, when the above-described conventional crime prevention cover is put on a thumb turn, the thumb turn is essentially oval so that the thumb turn locked or unlocked state which is visible depending on the rotation position becomes invisible. As a result, erroneous operation is likely to occur, and there is a problem that the operability of locking and unlocking is lowered.
In addition, since it is composed of a mounting part that enables the thumb turn to rotate and a main body part that is idled and detachable with respect to this mounting part, storage management of the detached main body part becomes complicated and operability is improved. In addition to being lowered, there was a risk of losing the main body.

  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 security thumb turn that allows the vertical and horizontal postures of the knobs to be seen in the same way as a simple thumb turn.

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 includes a substrate 3 fixed to the door 1,
A fixed cylinder 21 fixed to the substrate 3;
A core shaft 35 that is rotatably provided in the fixed cylinder 21 and connected to the input / output member 11 provided on the substrate 3;
A thumb turn cylinder 43 rotatably provided in the fixed cylinder 21;
A pair of stoppers 49, 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 stopper retracting recess 38a for allowing the stoppers 49 and 51 to move in a direction to release the engagement by allowing the thumb-turn cylinder 43 to rotate while allowing a predetermined play angle α to enter the stoppers 49 and 51. Thumb turn boss 38 on the outer periphery;
A cylindrical knob 41 disposed on the outer periphery of the fixed cylinder 21 and attached to the thumb turn boss 38 to protrude indoors;
It has leg portions 63a and 65a, protrudes from the outer peripheral surface of the knob 41, and slides inward in the radial direction of the knob 41 by being simultaneously pushed, and engages with the stoppers 49 and 51 through the leg portions 63a and 65a. A pair of buttons 63, 65 for releasing
A button urging means 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 thumb turn cylinder 43 is slidably provided in the direction orthogonal to the axis, and the pair of stoppers 49 and 51 are sandwiched by a gap between one end portions 67b and 69b separated by the urging means 71, and the other end portion 67c, A pair of release cross members 67 and 69 arranged in an approaching direction between 69c;
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.

  The crime prevention thumb turn 100 according to claim 2 is characterized in that the knob is provided with a rotational position confirmation means, for example, a mark such as printing or molding.

  The substrate 3 may be a thumb turn case that is fixed so as to protrude from the door surface and incorporates a mechanism portion, or a part of a lock box mechanism portion incorporated in the door, such as a lock box side plate. It is good also as a structure comprised as follows and being fixed to a door.

  In this security thumb turn 100, if the rotational force while pressing the buttons 63 and 65 is not applied to the knob 41, the operation with the knob 41 cannot be performed, and thus the inserted wire or bar is hooked on the knob. Unauthorized unlocking by rotating the knob 41 is prevented. Similarly to a general thumb turn, the knob 41 can be picked and rotated, and the restriction by the buttons 63 and 65 is automatically released and the knob 41 is rotated when a key lock operation is performed with a cylinder lock from the outside. Furthermore, unlike the configuration in which the conventional crime prevention cover is put on, the vertical and horizontal postures can be visually recognized by providing the knob 41 with the rotation position confirmation means. Further, two pairs of sandwiching plates 73a, 73b, 75a, and 75b sandwiching the projecting plate 39 from above and below are a total of two pairs of projecting plates 39 of the core shaft 35 from the left and right sides in the direction perpendicular to the axis, that is, four sandwiching plates. Since it is clamped by 73a, 73b, 75a, 75b, the clamp plates 73a, 73b, 75a, 75b are opened with the same moment in any rotation of the core shaft 35 in the clockwise rotation or counterclockwise rotation. In addition to this, when the knob 41 is turned before the push of the buttons 63 and 65, the stopper retracting recess 38a is displaced from the stoppers 49 and 51, and the stoppers 49 and 51 cannot be retracted to the stopper retracting recess 38a. 49 and 51 cannot be released.

According to the security thumb turn according to the present invention, the knob can be rotated by releasing the restriction by pressing the button. Therefore, if the rotary force is not applied to the knob while pressing the button, the operation by the knob cannot be performed. It is possible to prevent unauthorized unlocking by rotating the thumb-turn knob by hooking a rod or a rod to the knob and improving the crime prevention property.
Also, by providing a rotation position confirmation means on the knob, unlike the conventional security cover, the vertical and horizontal postures can be visually recognized, and as with a general thumb turn, the locked and unlocked state from the indoor side can be easily confirmed. can do.
Furthermore, since the core plate protrusion plate is clamped from both sides in the direction perpendicular to the axis by two pairs of clamping plates, the clamping plate can be opened with the same moment in either the clockwise or counterclockwise rotation of the core shaft. This makes it possible to perform a smooth key operation regardless of the left or right side.
In addition to this, if the knob is turned before the button is pushed, the stopper retracting recess will be displaced from the stopper, making it impossible to release the stopper. It becomes difficult to rotate the knob and the crime prevention can be further improved.

Hereinafter, a preferred embodiment of a security thumb turn according to the present invention will be described in detail with reference to the drawings.
1 is a longitudinal sectional view of a security thumb turn according to the present invention, FIG. 2 is a horizontal sectional view of a security thumb turn according to the present invention, FIG. 3 is a view taken along arrow AA in FIG. 1, and FIG. It is an arrow view.

  As shown in FIGS. 1 and 2, a thumb turn case 3 as a substrate is provided on a door 1 to which a security thumb turn 100 according to the present embodiment is attached. That is, the pedestal 5 is screwed to the door 1 with screws 7, and the thumb turn case 3 is screwed to the pedestal 5 with screws 9. In the present embodiment, the thumb turn case 3 is formed in a substantially box shape and is exposed and fixed to the indoor side surface of the door 1. The crime prevention thumb turn 100 can be suitably used as a retrofit lock for realizing so-called one-door-to-lock. That is, it can be retrofitted separately from the existing lock as the second thumb turn of the door 1 in which a lock box with a thumb turn is already provided. In this case, although not shown in the drawing, a dead bar lock described later is required on the indoor surface on the door frame side.

  Further, the security thumb turn 100 may be provided alone on the door 1 as described above, or may be provided so as to be interlocked with a lock box built in the door 1. Usually, the lock box is provided with a latch bolt, a dead bolt, and a lock box mechanism for advancing and retracting the latch bolt, the dead bolt, and the door 1. The dead bolt of the lock box is advanced and retracted from the mouth of the door 1 by rotating a cylinder lock provided on the outdoor surface of the door with a key. When the security thumb turn 100 is used in conjunction with such a lock box, as described in detail later, the restriction of the picking operation is also released by the unlocking operation of the cylinder lock.

In the present embodiment, an example will be described in which the security thumb turn 100 is configured such that the lock box mechanism is provided in the thumb turn case 3 and is attached in conjunction with the lock box mechanism. Moreover, although not shown in figure, the cylinder lock which a keyhole exposes to the outdoor surface of the door 1 is connected with the lock box mechanism part.
The thumb turn case 3 is provided with an input / output member 11 fixed to a core shaft 35 described later of the security thumb turn 100, and the input / output member 11 is engaged with the dead bar 15 via a pin 13 shown in FIG. When the knob 41 of the security thumb turn 100 is rotated, the dead bar 15 protrudes from the left or right side of the thumb turn case 3 through the core shaft 35, the input / output member 11 and the pin 13, as shown in FIGS. Is done. Therefore, the leading end of the protruding dead bar 15 is locked to a locking tool fixed on the door frame side, so that the door 1 can be locked to be opened.

  In this embodiment, since the security thumb turn 100 is interlocked with the cylinder lock on the outdoor side of the door, one end of the connection plate 17 is fixed to the tip of the pin 13 and the other end of the connection plate 17 is a cylinder (not shown). A joint shaft 19 linked to the lock is fixed. Therefore, the rotational force from the core shaft 35 slides the dead bar 15 and is transmitted to the cylinder lock side via the pin 13, the connection plate 17, and the joint shaft 19, and the operation force on the cylinder lock side is transmitted to the joint shaft 19. , The connection plate 17, the pin 13, and the input / output member 11 are transmitted to the core shaft 35. In FIG. 1, reference numeral 16 in FIG. 4 denotes a helical spring that biases the dead bar 15 toward both ends in the sliding direction.

5 is an exploded view of the security thumb turn shown in FIG. 1, FIG. 6 is an exploded perspective view of a member near the stopper shown in FIG. 5, FIG. 7 is an enlarged perspective view of the thumb turn boss shown in FIG. It is a disassembled perspective view of the knob vicinity member shown in FIG.
A fixed cylinder 21 is fixed to the thumb turn case 3. A core shaft 35 is rotatably provided inside the fixed cylinder 21, and the rear portion of the core shaft 35 is connected to the input / output member 11 in the thumb turn case 3 as described above. The core shaft 35 is provided with a protruding plate 39 shown in FIG. Accordingly, when the input / output member 11 of the thumb turn case 3 is rotated, the protruding plate 39 is also rotated.

  A thumb turn cylinder 43 shown in FIG. 5 is rotatably provided inside the rear end side of the fixed cylinder 21. In addition, a thumb turn boss 38 to which a knob 41 is attached is rotatably provided in the distal end side of the fixed cylinder 21. The thumb turn boss 38 rotates in conjunction with the thumb turn cylinder 43 while allowing a predetermined play angle. As shown in FIG. 7, a pair of stopper retracting recesses 38a that are opened radially outward are formed on the surface of the thumb turn boss 38 on the core shaft 35 side, and the stopper retracting recesses 38a allow a stopper to be described later to enter, Allows movement in the direction to release the stopper. In addition, a pair of interference portions 83 project from the surface of the thumb turn boss 38 on the core shaft 35 side, and a concave groove 91 with which a click ball, which will be described later, contacts is formed in the interference portion 83. Further, the thumb turn boss 38 has a through hole 29 through which a leg portion of a stopper, which will be described later, passes.

  The knob 41 is formed in a cylindrical shape as shown in FIG. 8, for example. Thereby, even if it tries to hook the wire to the knob 41 or to push and push it with a rod, the wire and the rod 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. A pair of dent portions 31 are formed on both sides in the diametrical direction on the outer periphery of the knob 41 close to the indoor side end surface, and a button pressing portion described later is disposed in the dent portion 31.

  As shown in FIG. 6, the thumb turn cylinder 43 has a cylindrical portion 45, and the cylindrical portion 45 is formed with notches 47 that are open at both ends in the diameter direction. A pair of shafts 45 a and 45 a that support a later-described sandwiching plate project from the rear end surface of the tubular portion 45 toward the core shaft 35. 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. Further, the stopper 51 is formed with a leg engaging portion 51a and a release surface 51b shown in FIG. Further, the stoppers 49 and 51 are provided with engaging portions 49c and 51c positioned on the radially outer side of the thumb turn cylinder 43, and the engaging portions 49c and 51c can enter the stopper retracting recess 38a. .

  The pair of stoppers 49 and 51 are slid outward in the radial direction of the tubular portion 45 by engaging leg portions provided on a button described later with the leg engaging portions 49a and 51a. It protrudes and engages with engaging grooves 55 and 56 formed in the fixed cylinder 21. When the stoppers 49 and 51 are engaged with the engagement grooves 55 and 56, the thumb turn cylinder 43 cannot be rotated. Further, when the stoppers 49 and 51 are slid radially inward, the engaging portions 49c and 51c come out of the engaging grooves 55 and 56, and enter the stopper retracting recess 38a of the thumb turn boss 38 shown in FIG. By doing so, the engagement is released.

  As shown in FIG. 8, the knob 41 is extrapolated rotatably from the indoor side end face of the fixed cylinder 21. Since the fixed cylinder 21 is fixed to the thumb turn case 3, the knob 41 is rotatable with respect to the fixed cylinder 21. A button housing groove 22 in the diametrical direction is formed on the end surface on the indoor side of the knob 41. A button leg through hole 23 is formed in the center in the longitudinal direction of the button receiving groove 22. The button leg through hole 23 communicates with the inside of the fixed cylinder 21 through the end surface opening hole 24 of the fixed cylinder 21. A stopper holding plate 25 is fixed to the indoor side end face of the knob 41 in a state where a button described later is accommodated in the button accommodating groove 22. The stopper holding plate 25 is positioned by inserting the positioning protrusion 26 into the positioning hole 28 of the knob 41. When the stopper holding plate 25 is positioned, the claw hole 30 coincides with the locking hole 32. A screw through hole 33 is formed in the stopper holding plate 25, and the stopper holding plate 25 is fixed to the thumb turn boss 38 by screwing a screw 34 inserted through the screw through hole 33 into a fixing screw portion 36 of the thumb turn boss 38. Is done. That is, the knob 41 is rotatably attached to the fixed cylinder 21 and fixed to the thumb turn boss 38.

  The head of the screw 34 is exposed on the indoor side surface of the stopper holding plate 25, and this head is covered with a screw cover 37 that is locked to the stopper holding plate 25. The screw cover 37 is fixed to the knob 41 by locking the locking claw 37 a inserted through the claw hole 30 of the stopper holding plate 25 into the locking hole 32 of the knob 41. Thereby, the screw cover 37 covers the screw head exposed on the indoor side end face of the knob 41. On the indoor surface of the screw cover 37, a rotational position confirmation mark (not shown) as rotational position confirmation means (not shown) is provided so that the rotational position of the knob 41 can be visually recognized. The rotational position confirmation mark may be formed by a minute convex portion or concave portion in addition to printing. The rotational position confirmation mark is formed in, for example, a negative shape or a rectangular shape so as to represent the front end surface of the plate-shaped thumb turn.

  The button receiving groove 22 of the knob 41 accommodates a pair of buttons 63 and 65 that are slidable in the groove direction. As for the buttons 63 and 65, the pressing part 44 protrudes in the recess 31 of the knob 41. The buttons 63 and 65 have leg portions 63a and 65a projecting in the direction of the core shaft 35, and are formed in a substantially T shape. The leg portions 63a and 65a are engaged with the leg engaging portions 49a and 51a of the stoppers 49 and 51 described above.

  Further, button urging springs 66 and 66 as button urging means are sandwiched between the buttons 63 and 65, and the button urging spring 66 urges the buttons 63 and 65 in the separating direction. The buttons 63 and 65 are arranged in a direction away from each other by a button urging spring 66 so that the leg portions 63a and 65a are arranged horizontally. The pair of stoppers 49 and 51, in which the leg portions 63a and 65a are engaged with the leg engaging portions 49a and 51a, are disposed horizontally as described above, as shown in FIG. Then, it protrudes from the cylindrical portion 45 and engages with the engagement groove 55.

  On the other hand, the buttons 63 and 65 are pushed in the approaching direction against the urging force of the button urging spring 66, whereby the leg portions 63a and 65a are alternately operated and opened. As a result, as will be described in detail later, the pair of stoppers 49 and 51 are slid inwardly in the radial direction of the cylindrical portion 45 to operate to release the engagement with the engagement groove 55.

  A pair of release cross members 67 and 69 shown in FIG. 6 slidable in the direction orthogonal to the axis of the thumb turn cylinder 43 are provided inside the fixed cylinder 21. The release cross member 67 has a stopper clamping piece 67b as one end protruding toward the knob 41 at the upper end of the vertical axis 67a and a separation as the other end protruding toward the lock box at the lower end of the vertical axis 67a. And a piece 67c. Further, the release crossing member 69 has a stopper holding piece 69b as one end protruding toward the knob 41 at the lower end of the vertical axis 69a and the other end protruding toward the lock box at the upper end of the vertical axis 67a. The separation piece 69c.

  The release cross members 67 and 69 are formed of a pair of stoppers 49 and 69 in a gap between the stopper holding pieces 67b and 69b separated by a compression spring 71 as an urging means inserted between the stopper holding pieces 67b and 69b. 51, and 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 separating pieces 67c and 69c, which are the other end portions of the pair of release cross members 67 and 69, in the separating direction by this leg-opening operation. A pair of stoppers 49 and 51 are slid in the disengagement direction between the stopper holding pieces 67b and 69b.

Next, the operation of the security thumb turn 100 having the above configuration will be described.
9 is a front view of the knob in a state where the button is pressed, FIG. 10 is a longitudinal sectional view of the knob shown in FIG. 9, FIG. 11 is a locked state in the CC section of FIG. FIG. 12 is an operation explanatory diagram shown in FIG. 1B, FIG. 12 is an operation explanatory diagram showing the locked state in the DD cross section of FIG. 1, and FIG. Fig. 14 is an operation explanatory diagram showing the locked state in the D section as (a) and the button pressed state in (b). Fig. 14 shows the locked state in the EE section of Fig. 1 (a), and the knob is rotated without pressing the button. It is operation | movement explanatory drawing which represented the state made into (b).

In the security thumb turn 100, in the locked state, the rotational position confirmation mark of 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 biasing force of the button biasing spring 66. 12 (a) and 13 (a), the engagement groove 55 is engaged.
In order to release the locked state of the security thumb turn 100, the pressing portion 44 of the buttons 63 and 65 protruding from the recessed portion 31 of the knob 41 is pressed as shown in FIG.
When the buttons 63 and 65 are pushed in, as shown in FIG. 10, the legs 63a and 65a are opened from a state where they are horizontally aligned. As a result, as shown in FIG. 13B, the pair of stoppers 49 and 51 are slid inward in the radial direction of the cylindrical portion 45 and 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 56 is formed on the inner periphery of the fixed cylinder 21 as shown in FIG. 5 at the vertical position of the knob 41, the stoppers 49 and 51 are engaged with the engaging groove 56 this time. As a result, the buttons 63 and 65 are brought into a state in which the pressing portion 44 protrudes again at the recessed portion 31.

  In the crime prevention thumb turn 100, the engaging grooves 55 and 56 are disposed at an angle of 90 degrees as described above, so that the knob 41 can be restricted by the stoppers 49 and 51 in both the vertical and horizontal states of the knob 41. . That is, the knob 41 is restricted in rotation in both the locked state and the unlocked state. For this reason, the security thumb turn 100 can be retrofitted by eliminating the left and right sides of the security thumb turn 100.

  On the other hand, in order to change from the unlocked state to the locked state, the knob 41 is rotated until it is in a horizontal state while pressing the buttons 63 and 65. That is, if the knob 41 is rotated from the vertical state to the horizontal state, the rotational force is transmitted to the core shaft 35 via the thumb turn cylinder 43, the release cross members 67 and 69, and the clamping plates 73a, 73b, 75a, and 75b. At the same time, the stoppers 49 and 51 are aligned with the engagement groove 55, and enter the engagement groove 55 by the urging force of the button urging spring 66, and the state shown in FIGS. 12 (a) and 13 (a) is obtained again. The buttons 63 and 65 protrude to complete the locking.

  Further, in the locked state, when the cylinder lock is operated with the key from the outdoor side, the joint shaft 19 rotates, and the core shaft 35 rotates in conjunction with the rotation. When the core shaft 35 is rotated, the projecting plate 39 is tilted, whereby the sandwiching plates 73a, 73b, 75a, and 75b are opened as shown in FIGS. 11 (a) to 11 (b). When the clamping plates 73a, 73b, 75a, 75b are opened, the separation pieces 67c, 69c of the release cross members 67, 69 are opened. As a result, the stopper holding pieces 67b, 69b of the release cross members 67, 69 are shown in FIG. As shown in FIG. 12B, the pair of stoppers 49 and 51 are sandwiched in the direction to be sandwiched, and the stoppers 49 and 51 are moved in a direction to be removed from the engagement groove 55.

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

  Furthermore, for example, when the knob 41 is turned before the push of the buttons 63 and 65 by an inserted wire, a rod or the like, the stopper retracting recess 38a is changed from the state shown in FIG. The state shown in FIG. 14B is displaced from the stoppers 49 and 51, the stoppers 49 and 51 cannot be retracted to the stopper retracting recess 38a, and the stoppers 49 and 51 cannot be released. In this case, the buttons 63 and 65 cannot be pushed in by the stoppers 49 and 51 that have become non-slidable.

  Here, during normal operation, it is preferable that the position of the knob 41 is held horizontally so that the stoppers 49 and 51 can enter the stopper retracting recess 38a so that the buttons 63 and 65 can be easily pushed. Such a horizontal holding mechanism can be realized by providing a click mechanism on the thumb turn cylinder 43 and the thumb turn boss 38. That is, as shown in FIG. 14, the thumb turn cylinder 43 and the thumb turn boss 38 are rotatable relative to each other with a predetermined play angle α. The play angle α can be set by a gap 85 formed by the interference portions 81 and 83 between the thumb turn cylinder 43 and the thumb turn boss 38. A click ball 89 that is urged radially outward by the urging spring 87 is provided in the interference portion 81 on the thumb turn cylinder 43 side, and a concave groove 91 in which the click ball 89 abuts on the interference portion 83 on the thumb turn boss 38 side. Form. Accordingly, the knob 41 is accurately held horizontally, and the stoppers 49 and 51 can enter the stopper retracting recess 38a, so that the buttons 63 and 65 can be easily pushed in during normal operation.

  In the unlocked state, the stoppers 49 and 51 are engaged when the locked state is established from the outdoor side via the cylinder lock. However, the engagement is released in the same manner as in the unlocked state. It is a normal locking operation. 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 100, if the rotational force while pressing the buttons 63 and 65 is not applied to the knob 41, in particular, the pair of buttons 63 and 65 must be simultaneously pressed and rotated. 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 on the knob 41 is prevented. In addition, as with a general thumb turn, the knob 41 can be picked and rotated, and the stoppers 49 and 51 are automatically released and the knob 41 is rotated when the key is locked with a cylinder lock from outside. Operability is ensured. Furthermore, unlike the conventional structure in which the security cover is put, the vertical / horizontal posture of the knob 41 can be visually recognized by the rotation position confirmation mark, so that the locked / unlocked state from the indoor side is easy as in a general thumb turn. Can be confirmed.

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

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

  Further, in this security thumb turn 100, since the buttons 63 and 65 are slid along the longitudinal direction of the groove in the button receiving groove 22 formed in the knob 41, the leg portions 63a and 65a The overall length can be shortened, and the length of the fixed cylinder 21 in the axial direction, that is, the protruding length of the knob 41 can be shortened.

  In the above-described embodiment, the example in which the shape of the knob 41 is formed in a cylindrical shape has been described. However, the shape is not limited thereto, and may be a shape in which an intermediate part is an bulging shape in an elliptical shape. Alternatively, a shape such as a cone shape or a prism shape may be used.

  Further, the engaging grooves 55 and 56 with which the stoppers 49 and 51 are engaged are arranged in the fixed cylinder 21 at an angle of 90 degrees, and the rotation of the knob 41 is restricted in both the vertical and horizontal states. However, it may be configured at only the position of the engagement groove 55 or the position of the engagement groove 56. In this case, the locked state may be established. The stoppers 49 and 51 are engaged with each other to restrict the rotation. With such a configuration, in the unlocked state, the stoppers 49 and 51 are kept slid inward in the radial direction of the cylindrical portion 45, and therefore, the buttons 63 and 65 are pushed in during the locking operation. Operation is possible without it.

It is a longitudinal cross-sectional view of the crime prevention thumb turn which concerns on this invention. It is a horizontal sectional view of a security thumb turn according to the present invention. It is an AA arrow line view of FIG. It is a BB arrow line view of FIG. FIG. 2 is an exploded view of the security thumb turn shown in FIG. 1. It is a disassembled perspective view of the stopper vicinity member shown in FIG. FIG. 6 is an enlarged perspective view of the thumb turn boss shown in FIG. 5. It is a disassembled perspective view of the knob vicinity member shown in FIG. It is a front view of the knob | pick in a button press state. It is a longitudinal cross-sectional view of the knob shown in FIG. It is operation | movement explanatory drawing which represented the locked state in CC section of FIG. 1 to (a), and represented the cylinder lock rotation state to (b). It is operation | movement explanatory drawing which represented the locked state in the DD cross section of FIG. 1 to (a), and represented the cylinder lock rotation state to (b). It is operation | movement explanatory drawing which represented the locked state in the DD cross section of FIG. 1 to (a), and represented the button pushing state in (b). FIG. 2 is an operation explanatory diagram illustrating a locked state in the EE cross section of FIG. 1 as (a) and a state where a knob is rotated without pressing a button, as illustrated in (b).

Explanation of symbols

1 ... Door 3 ... Board (thumb case)
DESCRIPTION OF SYMBOLS 11 ... Input / output member 21 ... Fixed cylinder 35 ... Core shaft 38 ... Thumb turn boss 38a ... Stopper recessed part 39 ... Projection plate 41 ... Knob 43 ... Thumb turn cylinder 49, 51 ... Stopper 63, 65 ... Button 63a, 65a ... Leg part 66 ... Button biasing means (button biasing spring)
67,69 ... Release cross member 67b, 69b ... One end (stopper clamping piece)
67c, 69c ... the other end (spaced piece)
71 ... biasing means (compression spring)
73a, 73b, 75a, 75b ... clamping plate 100 ... security thumb turn

Claims (2)

A substrate fixed to the door;
A fixed cylinder fixed to the substrate;
A core shaft rotatably provided in the fixed cylinder and coupled to an input / output member provided on the substrate;
A thumb-turn cylinder rotatably installed in the fixed cylinder;
A pair of stoppers provided in the thumb turn cylinder so as to be slidable in the direction perpendicular to the axis and protruding from the outer periphery of the thumb turn cylinder to engage the fixed cylinder, thereby preventing rotation of the thumb turn cylinder;
A thumb turn boss having an outer periphery with a stopper recess for allowing the stopper to move in a direction to release the engagement by allowing the thumb turn cylinder to rotate while allowing a predetermined play angle.
A cylindrical knob disposed on the outer periphery of the fixed cylinder and attached to the thumb turn boss and projecting indoors;
A pair of buttons that have leg portions, a part of which protrudes from the outer peripheral surface of the knob, and is simultaneously pushed to slide radially inward of the knob to release the engagement of the stopper via the legs;
A button urging means for urging the stopper in the engaging direction via the legs by urging the pair of buttons in the separating direction;
A pair of thumbturn cylinders slidably provided in the direction orthogonal to the axis and sandwiching the pair of stoppers with a gap between one ends separated by an urging means, and the other ends arranged in the approaching direction. A release cross 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
Crime prevention thumb turn characterized by comprising.   The crime prevention thumb turn according to claim 1, wherein the knob is provided with a rotation position confirmation means.

Images