JP2013032619A - Crime-preventing thumb-turn - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a low-cost crime-preventing thumb-turn, which prevents lock-picking, is of a simple structure with a small number of component parts, and can be operated securely and steadily.SOLUTION: An outer cylinder 80 is fitted with a tab 2 and a thumb shaft 50 at its rear and forward ends respectively, both rotatably. The shaft of the aforesaid tab is engaged to the thumb shaft so that the rotation of the tab is transferred to a door key L by the tab's integrally turning the thumb shaft. A pair of button members 30 and 40 are fitted to the tab. When the key is locked, buttons 31 and 41 of the button members protrude from the tab, while latch parts 33 and 43 formed on the button members engaging into a latch groove formed on the outer cylinder to regulate the rotation of the tab. The aforesaid rotation regulation is released by pressing the aforesaid buttons in. A rotation-transferring mechanism, in which a control part formed at the forward end of the aforesaid pair of button members is engaged to a control groove formed on the thumb shaft, is arranged so that the rotation regulation on the tab is released by operating the cylinder from the outside of the room via the aforesaid rotation-transferring mechanism.

Description

  The present invention relates to a crime prevention thumb turn that prevents unauthorized unlocking of a door lock by restricting the rotation of a thumb turn knob provided on the indoor side of the door lock.

  Door locks provided on the entrance doors of houses and entrance doors of offices are locked and unlocked by operating the dead bolts of the door locks by operating the cylinder with a key from the outside, and the thumb turn is picked from the indoor side. It can be locked and unlocked by rotating operation.

  However, in recent years, a wire or a bar is inserted through a gap between the door and the frame or a small hole opened in the door with a tool, and the thumb turn is picked by hooking the wire or a bar to the thumb turn that is easy to rotate. There is an increasing criminal trick called “Turn Turn” that rotates and unlocks door locks illegally.

  In order to prevent the unauthorized unlocking, for example, a crime prevention thumb turn disclosed in Patent Document 1 (Japanese Patent Laid-Open No. 2005-42498) has been proposed. This security thumb turn is provided with a pair of buttons for the knob and a stopper for restricting the rotation of the knob. When the button is pressed, the rotation of the knob is released by rotating the knob while the cylinder is operated from the outside. When a rotational force is input to the thumb-turn rotor, the holding piece is opened by the rotation of the rotor to release the restriction on the knob by the stopper, and the knob is rotated.

JP 2005-42498 A

However, the conventional crime prevention thumb turn has an effect of preventing unauthorized unlocking, but has a problem in that its configuration is complicated, the number of parts is large, the assembling workability is poor, and the whole is expensive. .
In other words, the pair of stoppers that regulate the rotation of the knob are provided separately from the buttons, and each of them is urged by a tension spring, and the rotation transmission that cancels the rotation regulation by operating the cylinder from the outdoor side. The mechanism is provided with a pair of holding pieces separately, each holding piece is urged by a spring to hold the protruding piece of the core shaft, and the core piece is rotated by operating the cylinder to open the holding piece. Thus, the rotation control of the knob is released.

  The present invention has been made to solve the above-described conventional problems, and can prevent unauthorized unlocking by unlocking the inserted wire or bar by hooking on the thumb turn knob and rotating it. It is simple and has a small number of parts, is excellent in assembling workability, can ensure good operability, and can provide a security thumb turn with excellent durability at low cost. In addition, as with a general thumb turn, it is possible to provide a door that can be visually confirmed in the locked / unlocked state of the door lock in a horizontal / vertical posture.

Next, means for solving the above problems will be described with reference to the drawings corresponding to the embodiments.
The crime prevention thumb turn according to claim 1 of the present invention is a crime prevention thumb turn of a door lock that is locked and unlocked by a knob operation from the outside side and a cylinder from the indoor side, and is provided at the rear end portion of the outer cylinder of the crime prevention thumb turn. A knob is rotatably provided, a thumb shaft is rotatably provided at the front end portion of the outer cylinder, the shaft portion of the knob is engaged with the thumb shaft, and the thumb shaft is integrally rotated by the rotation of the knob. The knob is provided to transmit the rotation of the knob to the door lock, and a pair of button members are held on the knob, and the button of the button member protrudes from the knob at the time of locking, and a locking portion formed on the button member Is provided so as to restrict the rotation of the knob by engaging with a locking groove formed in the outer cylinder and to release the restriction by pressing the button, while at the tip of the pair of button members The formed control unit A rotation transmission mechanism engaged with a control groove formed on the thumb shaft is provided, and the rotation of the knob is regulated through the rotation transmission mechanism by the rotational force of the thumb shaft transmitted from the outdoor side by operating the cylinder. It is characterized by being released.

If the rotational force is not applied to the knob while pushing the button of the button member, the crime prevention thumb turn cannot be rotated by the knob and cannot be unlocked. Thereby, unauthorized unlocking by rotating the knob with the inserted wire or rod can be prevented. Further, when locking, the knob can be rotated and locked regardless of the button operation, like a general thumb turn.
Furthermore, when the cylinder is operated with the key from the outdoor side, the control by the button member is automatically released by the rotation input from the door lock, and the knob is rotated, so that the knob is rotated, thus ensuring good operability. . In addition, by forming the knob in a rectangular shape, for example, the horizontal / vertical posture of the knob can be visually confirmed, so that the door lock / unlock state from the indoor side can be easily confirmed as with a general thumb turn. Become.

  According to the crime prevention thumb turn according to the first aspect of the present invention, a pair of button members that restrict the rotation of the knob while releasing the restriction by pushing are protruded on the front and back surfaces of the knob, and the rotation of the knob is locked to the door. On the other hand, for the rotation input from the door lock by the cylinder operation from the outside side, the rotation transmission mechanism that automatically releases the rotation restriction by the button member and enables the knob to rotate is provided between the knob and the door lock. Therefore, if you do not apply rotational force to the knob while pushing the button of the button member, you cannot perform the unlocking operation with the knob, and this will prevent unauthorized unlocking by turning the knob with an inserted wire or stick etc. It can be prevented and crime prevention can be improved.

  In the security thumb turn according to the present invention, the pair of button members are provided by being urged by a compression spring in the direction in which the button protrudes from the knob, and the engaging portion formed on the button member is engaged with the engaging groove provided in the outer cylinder. Since the rotation of the knob is regulated in combination, the rotation of the knob and the regulation unlocking can be reliably performed, and the number of constituent members is small and the assembly is easy. Furthermore, since the rotation transmission mechanism is constituted by the control part of the button member engaged with the control groove of the thumb shaft, the number of constituent members of the entire security thumb turn is small.

  In addition, as with a general thumb turn, when locking, the knob can be rotated and locked regardless of the button, and when the cylinder is unlocked from the outdoor side, the restriction by the button is automatically released. Since the knob rotates, good operability can be ensured. Furthermore, since the horizontal and vertical postures of the knob can be visually recognized if the knob is formed in a rectangular shape, the locked / unlocked state can be easily confirmed from the indoor side as in the case of a general thumb turn.

It is a cross-sectional view of the locked state of the crime prevention thumb turn which concerns on this invention. It is sectional drawing in the AA of FIG. It is sectional drawing in the BB line of FIG. It is a longitudinal section of the locked state of a crime prevention thumb turn. It is sectional drawing in the CC line of FIG. It is sectional drawing in the DD line | wire of FIG. It is a disassembled perspective view of the security thumb turn which concerns on this invention. It is a disassembled perspective view of a knob. It is a disassembled perspective view of a button member. It is the perspective view which looked at the thumb shaft and thumb shaft guide from the rear side (back side). It is a longitudinal cross-sectional view of the state which pushed the button in the locked state of FIG. It is sectional drawing in the C1-C1 line | wire of FIG. It is sectional drawing in the D1-D1 line | wire of FIG. FIG. 12 is a cross-sectional view taken along line C1-C1 of FIG. 11 in a state where the knob is rotated about 15 ° clockwise. It is sectional drawing in the D1-D1 line | wire of FIG. 11 in the state of FIG. FIG. 5 is a longitudinal sectional view when the thumb shaft is rotated clockwise from the door lock side by operating the cylinder of the key in the locked state of FIG. 4. It is sectional drawing in the C2-C2 line | wire of FIG. It is sectional drawing in the D2-D2 line | wire of FIG. FIG. 17 is a cross-sectional view taken along line C2-C2 of FIG. 16 when the thumb shaft is further rotated from the state of FIG. It is sectional drawing in the D2-D2 line | wire of FIG.

Embodiments of a security thumb turn according to the present invention will be described below with reference to the drawings.
The crime prevention thumb turn according to the present invention has a knob 2 at the rear end of the outer cylinder 80 of the crime prevention thumb turn 1 in the crime prevention thumb turn 1 of the door lock that is locked and unlocked by the operation of the cylinder from the outdoor side and the knob 2 from the indoor side. The thumb shaft 50 is rotatably provided at the front end portion of the outer cylinder 80, the shaft portion 2 a of the knob 2 is engaged with the thumb shaft 50, and the thumb shaft 50 is rotated by the rotation of the knob 2. The knob 2 is provided so as to rotate integrally and transmit the rotation of the knob 2 to the door lock L. The knob 2 holds a pair of button members 30 and 40, and the buttons 31 of the button members 30 and 40 are locked when the knob is locked. 41 protrudes from the knob 2, and the locking portions 33, 43 formed in the button members 30, 40 engage with the locking grooves 73, 73 formed in the outer cylinder 80 to rotate the knob 2. And restricting the buttons 31, 41 The control unit 34 and 44 formed at the tip end portions of the pair of button members 30 and 40 are engaged with control grooves 55 and 55 formed in the thumb shaft 50. The rotation transmission mechanism 5 is provided, and the control of the rotation of the knob is released via the rotation transmission mechanism 5 by the rotational force of the thumb shaft 50 transmitted by the operation of the cylinder from the outdoor side. It is characterized by.
For details, reference may be made to the embodiments described below.

Hereinafter, Embodiment 1 of the security thumb turn according to the present invention will be described in detail with reference to the drawings.
1 is a cross-sectional view of a security thumb turn according to the present invention, FIG. 4 is a vertical cross-sectional view of the same, FIG. 7 is an exploded perspective view of the security thumb turn, FIG. 8 is an exploded perspective view of a knob, and FIG. FIG. 10 is an exploded perspective view, and FIG. 10 is a perspective view of the thumb shaft and thumb shaft guide as viewed from the rear side (back side).

  The door lock L to which the security thumb turn 1 according to the present embodiment is attached is a door bolt L that locks and unlocks a dead bolt (not shown) through an operating mechanism (not shown) by rotation of the hub H. The hub H is rotated by the operation of the cylinder by the key combination, and the hub H is rotated and unlocked by rotating the knob 2 of the security thumb turn 1 provided on the indoor side from the indoor side.

The crime prevention thumb turn 1 is operated so as to allow the rotation operation by restricting or releasing the rotation operation of the knob with the following configuration.
A cylindrical outer cylinder 80 is fixed to the door or the lock. The outer cylinder 80 is formed with a bearing portion 81 that is fitted and supported by the knob 2 at the center portion in the axial direction, and a raised portion 87 that protrudes from the bearing portion 81 toward the front end side in the axial direction of the outer periphery. 87, and mounting holes 88, 88 penetrating in the axial direction in the raised portions 87, 87 are formed.
In FIGS. 1 and 7, etc., 82 is a hole for fitting the flange 52 of the thumb shaft 50 and the fixing plate 70, 83 is a recess for fitting the mounting piece 74 of the fixing plate 70, and 86 is an opening. is there.

   Reference numeral 90 denotes a decorative ring that covers the outer peripheral surface of the outer cylinder 80 from the rear end side of the outer cylinder 80, and the front end of the bearing portion 81 of the outer cylinder 80 is located at the center of the rear end of the decorative ring 90. Are formed, and an opening 96 is formed toward the front side. Mounting holes 92 and 92 communicating with the mounting hole 88 of the outer cylinder 80 are formed at the outer peripheral position of the hole 91.

  In the present specification, in the knob 2, the thumb shaft 50, the shaft guide 60, the fixing plate 70, the outer cylinder 80, the decorative ring 90, etc., the “front end (front)” is the door direction side as viewed from the indoor side. The “rear end (rear)” means the front side of the door as viewed from the indoor side.

  The outer cylinder 80 is fitted into the opening 96 of the decorative ring 90 from the rear end side, and the outer peripheral surface of the outer cylinder 80 is covered with the decorative ring 90. Then, after aligning the mounting hole 88 of the outer cylinder 80 and the mounting hole 92 of the decorative ring 90, screws (not shown) are inserted through the mounting holes 88 and 92 and directly into the door lock L. Either fixed or screwed into a screw hole of a mounting column (not shown) fixed to a cylinder (not shown). Thereby, when the outer cylinder 80 is attached and fixed to the door lock or the cylinder, the outer cylinder 80 and the decorative ring 90 are fixed integrally.

   Inside the outer cylinder 80, a fixing plate 70 and a shaft guide 60 are attached and fixed with screws 68, and a thumb shaft 50 is rotatably provided therein. The thumb shaft 50 has an input / output shaft 51 having a cross-shaped cross section at the front end, and a V-shaped control groove 55 constituting the rotation transmission mechanism 5 is formed at the top and bottom at the rear end. Four protrusions 54 are formed at four positions symmetrically about the center (see FIGS. 1 and 7). The thumb shaft 50 is formed with a pair of holes 58, 58 on the diameter line of the flange 52 as shown in FIGS. 3, 7, and 10, and a spring 57 and a ball 56 are provided in the holes 58, 58. It is fitted.

The shaft portion 2a of the knob 2 is inserted into the outer cylinder 80 from the rear end portion thereof to the bearing portion 81 and is rotatably supported. 2e and 2e are washers, and 2f is a retainer for retaining.
A spring 2c and a click ball 2d are fitted in holes 2b and 2b formed on the left and right in the horizontal direction on the shaft 2a of the knob 2, and the ball 2d is formed in a recess formed in the hole 82 of the outer cylinder 80. The knob 2 is stably held in the horizontal state in the locked state and the unlocked state in the vertical state (see FIGS. 1 and 2).

  The knob 2 is divided into an upper plate 10 and a lower plate 20, and a pair of button members 30, 40 that are swingable about a swing shaft 38 as a center of rotation is sandwiched between the upper and lower plates 10, 20. Has been. Further, button holes 11 and 21 are provided in the upper and lower plates 10 and 20. Locking portions 33 and 34 and control portions 34 and 44 are formed at the front end portions of the button members 30 and 40, and buttons 31 and 41 are formed at the rear end portions. These buttons 31 and 41 are provided so as to always protrude from the button holes 11 and 21 of the upper and lower plates 10 and 20 by a spring 39 such as a compression spring. In addition, the compression spring 39 is provided in the recessed parts 35 and 45 formed in the button members 30 and 40 (refer FIG.4, FIG.5, FIG.9).

Since the button members 30 and 40 are urged so that the buttons 31 and 41 protrude from the knob 2, the tip of the button member 30 is urged downward, and the tip of the button member 40 is urged upward. Then, the locking portions 33 and 43 of the button members 30 and 40 engage with the locking grooves 73 and 73 of the fixing plate 70. Accordingly, the rotation of the knob 2 is restricted. When the buttons 31 and 41 are pushed in, the engaging portions 33 and 34 of the button members 30 and 40 are disengaged from the engaging grooves 73 and 73 of the fixing plate 70, and the restriction of the rotation of the knob 2 is released. .
In FIG. 8, 12 and 13 are notches formed in the upper plate 10 or the lower plate 20 constituting the knob 2, and the arm portions 32 and 42 of the button members 30 and 40 are fitted into the notches 12 and 13, respectively. Be dressed. 15 and 25 are grooves for fitting the retainer 2f, 16 and 26 are screw holes, 17 and 27 are bearing portions for supporting the swing shaft 38, 18 is a screw, and 28 is a projection portion.
In FIG. 9, reference numerals 36 and 46 denote swing shaft holes into which the swing shaft 38 is inserted, and reference numerals 37 and 47 denote guides.

  On the other hand, a thumb shaft 50, a shaft guide 60, and a fixed plate 70 are fitted to the outer cylinder 80 from the tip, and the fixed plate 70 and the shaft guide 60 are fixed to the outer cylinder 80 with screws 68. It is provided rotatably.

  The fixing plate 70 has a hole 71 formed in the center, and a flange 72 is provided on the outer periphery of the hole 71. The rear end of the thumb shaft 50 is fitted into the flange 72, so that the thumb shaft 50 is rotatable. Is provided. The hole 71 is formed with the locking grooves 73, 73 that are continuously provided above and below the hole 71. Further, mounting pieces 74 and 74 are provided above and below the flange portion 72, and mounting holes 75 and 75 for inserting screws 68 and 68 are formed in the mounting pieces 74 and 74. The fixing plate 70 is fitted into recesses 83 and 83 formed in the outer cylinder 80 with mounting pieces 74 and 74, and is fixed to the outer cylinder 80 with screws 68 and 68 together with the shaft guide 60 (FIGS. 4 and 7). reference).

  The tip of the shaft portion 2a of the knob 2 inserted from the rear end portion of the outer cylinder 80 is inserted into the hole 71 of the fixing plate 70, and the button members 30, 40 projecting vertically from the tip portion of the shaft portion 2a. The locking portions 43 and 33 engage with the locking grooves 73 and 73 of the fixing plate 70, and the rotation of the knob 2 is restricted.

  In FIG. 2, reference numeral 85 denotes a concave portion into which the ball 2d is inserted and retracted. In FIGS. 6, 10, and 13, reference numeral 53 denotes an engagement hole for the operating portions 14 and 24. 7 and 10, 61 is a guide hole of the shaft portion 51 of the thumb shaft 50, 62 is a bearing portion, 63 is a flange portion, 64 is a vertically extending mounting piece, 65 is a mounting piece 64 and a mounting piece 74. A mounting hole 66 for screwing onto the outer cylinder 80 with a screw 68, and a guide hole 66 for fitting the flange portion 52 of the thumb shaft 50.

Next, the operation of the security thumb turn having the above configuration will be described.
4 is a longitudinal sectional view in a locked state, FIGS. 5 and 6 are CC sectional views and DD sectional views in FIG. 4, FIG. 11 is a longitudinal sectional view in a state where a button is pushed in a locked state, FIG. 13 is a cross-sectional view taken along lines C1-C1 and D1-D1 in FIG.

In the locked state shown in FIG. 4, the knob 2 is positioned in the horizontal direction, the button members 30, 40 provided in the knob 2 are biased by the spring 39, and the buttons 31, 41 at the rear end protrude from the knob 2. The locking portions 33 and 34 at the front end portions engage with the locking grooves 73 and 73 of the fixing plate 70 fixed to the outer cylinder 80, and the rotation of the knob 2 is restricted (see FIGS. 4 and 5). ).
To release the above restriction, as shown in FIG. 11, the upper and lower buttons 31 and 41 protruding from the knob 2 are pushed in the direction of the arrow.
When the buttons 31 and 41 are pushed in, as shown in FIGS. 11 and 12, the button members 30 and 40 are swung so that the locking portions 33 and 34 at the tips thereof and the locking grooves 73 and 73 of the fixing plate 70 Since the engagement is released, the knob 2 can be rotated (see FIGS. 11 and 12).

FIGS. 14 and 15 show the state in which the buttons 31 and 41 are pushed in and the knob 2 is rotated about 15 ° clockwise as described above. The operating parts 14 and 24 at the tip of the knob 2 are connected to the thumb shaft 50. When the knob 2 is further rotated by contacting the projections 54, 54, the projections 54, 54 are pushed by the operation units 14, 24, the thumb shaft 50 is rotated, the hub H of the lock L is rotated, and the locking mechanism is operated. Then, the lock is unlocked.
Note that the rotation angle of the knob in the unlocking operation is generally about 90 °.

  As is apparent from FIG. 14, when the knob 2 is pushed from the locked state and the buttons 31 and 41 are pushed in and turned clockwise by about 90 ° as shown in FIGS. 11 and 12, the fixing plate 70 fixed to the outer cylinder 80 is The portions corresponding to the locking portions 33 and 43 of the button members 30 and 40 do not have the locking grooves 73. Therefore, the locking portions 33 and 43 cannot protrude, and the buttons 31 and 41 can be released even if they are released. Hold in the pressed-in state.

  When the knob 2 is rotated by 90 ° to return to the original position and the lock is locked, the buttons 31 and 41 protrude from the knob 2 and the locking portions 33 and 34 of the button members 30 and 40 protrude as shown in FIGS. Since it engages with the locking grooves 73, 73 of the fixing plate 70, the rotation of the knob 2 is restricted.

  The knob 2 has a horizontal posture in the locked state and a vertical posture in the unlocked state, but a click device is provided by the ball 2d, the spring 2c, and the concave portion 85 of the outer cylinder 80 so as to be stably held in that state. It has been.

Next, in the locked state of FIG. 4, FIG. 5, FIG. 6, the case where the cylinder (not shown) is operated and unlocked from the outdoor side with a key is described.
When the cylinder is operated, the hub H of the lock L rotates, and a rotational force is input to the thumb shaft 50 of the security thumb turn 1 via the input / output shaft 51 engaged with the hub H.

For example, when a clockwise rotational force is input to the thumb shaft 50 from the state of FIG. 6, the button member 30 engaged with the V-shaped control grooves 55, 55 formed at the rear end portion of the thumb shaft 50. 40, the slopes of the V-shaped control parts 34, 44 at the tips of the ends are pushed by the slopes of the control grooves 55, 55, so that the control part 34 is upward and the control part 44 is downward, as shown in FIG. 17, the engagement between the locking portions 33 and 43 of the button members 30 and 40 and the locking grooves 73 and 73 of the fixing plate 70 is released, as shown in FIG. 17.
Therefore, similarly to the case where the buttons 31 and 41 of the button members 30 and 40 are pushed in, the restriction on the rotation of the knob 2 is released, and the knob 2 can be rotated (see FIGS. 16 to 18).

The control grooves 55 and 55 of the thumb shaft 50 and the control portions 34 and 44 of the button members 30 and 40 engaged therewith constitute the rotation transmission mechanism 5 of the security thumb turn 1 of the present invention.
As with the knob 2, the balls 56, 56 and the springs 57, 57 and the shaft guide 60 are fixed to the thumb shaft 50 so that the thumb shaft 50 is stably held in the locked state and the unlocked state position. A click device including the formed recesses 67 and 67 is provided (see FIGS. 1 and 7).

  When the knob 2 can be rotated, the thumb shaft 50 can also be rotated. Therefore, when the knob 2 is rotated about 90 ° in the clockwise direction, the door lock is unlocked. 19 and 20 show the state in which the thumb shaft 50 is rotated about 15 ° clockwise from the state in which the knob 2 can be rotated by the rotational transmission mechanism 5, that is, the initial state of the unlocking operation. Indicates.

  As described above, even when the cylinder is operated from the outdoor side and the thumb shaft 50 is rotated and unlocked via the rotation transmission mechanism 5 by the rotational force input by the hub H of the door lock L, the indoor side as described above In the same manner as when the buttons 31 and 41 are pushed in, the knob 2 is rotated and the thumb shaft 50 is rotated and unlocked, the knob 2 is rotated 90 ° with the buttons 31 and 41 being automatically pushed. , Held in its unlocked state.

  In the unlocked state, when the cylinder is operated with the key from the outdoor side, the hub H of the lock L is rotated and the thumb shaft 50 is rotated via the input / output shaft 51 engaged with the hub H. In the unlocked state, the locking portions 34 and 44 of the button members 30 and 40 are not engaged with the locking grooves 73 and 73, and the rotation of the knob 2 is not restricted. Accordingly, the operating portions 14 and 24 of the knob 2 are pushed by the projection 54 of the thumb shaft 50, and the knob 2 rotates, and the original locked state shown in FIGS.

  According to the security thumb turn 1, unless the rotational force while pushing the button members 30 and 40 is applied to the knob 2, it is necessary to pick and rotate the pair of buttons 31 and 41, respectively. The unlocking operation by the knob 2 cannot be performed, thereby preventing the unauthorized unlocking by rotating the knob 2 by hooking the inserted wire or bar to the knob. Similarly to a general thumb turn, the knob 2 can be picked and rotated, and can be locked regardless of the button operation when locked. When the cylinder is operated from the outdoor side, the rotation transmission mechanism 5 allows the button member 30, Since the rotation restriction by 40 is automatically released and the knob 2 is rotated, good operability is ensured. Furthermore, since the horizontal / vertical posture of the knob 2 can be visually recognized, the locked / unlocked state from the indoor side can be easily confirmed in the same manner as a general thumb turn.

Furthermore, in this security thumb turn 1, the locking portion for restricting the rotation of the knob 2 is provided with the locking portions 33 and 43 on the button members 30 and 40 without separately providing the locking member. , 43 are engaged with the locking grooves 73, 73 of the fixing plate 70 fixed to the outer cylinder 80, and the rotation of the knob 2 is directly regulated by the button members 30, 40. The engaging state of the stop portion is stable, and a strong restricted state can be obtained.
Moreover, since the rotation restriction is released directly by pressing the button members 30 and 40, the rotation restriction can be reliably released.

    Further, the rotation transmission mechanism 5 for releasing the rotation restriction of the knob 2 by the rotation input from the door lock by the operation of the cylinder from the outdoor side includes the control grooves 55 and 55 of the thumb shaft 50 and the button member 30 engaged therewith. Since it is composed of 40 control units 34 and 44, it is not necessary to separately provide a regulation release member or the like, so there are few constituent members. In addition, since the rotation transmission mechanism 5 is efficiently provided inside the flange portion 52 of the thumb shaft 50, it is possible to provide a crime prevention thumb turn that is compact as a whole without increasing its size.

  As described above, the security thumb turn 1 is easy to assemble from the viewpoint that the springs for biasing the pair of button members 30 and 40 are compression springs in addition to being compact with few constituent members. As an inexpensive product.

  In addition, although the example which formed the shape of the knob | pick 2 in the substantially rectangular shape was described in the said Example, it is not restricted to this, For example, the shape where the middle part swells into an elliptical shape, for example, an ellipse The thing of a thing or a cone shape may be sufficient.

DESCRIPTION OF SYMBOLS 1 Crime prevention thumb turn 2 Knob 2a Shaft part 5 Rotation transmission mechanism 10 Upper board 12 Shaft part 20 Lower board 22 Shaft part 30 Button member 31 Button 33 Locking part 34 Control part (Rotation transmission mechanism)
40 Button member 41 Button 43 Locking portion 44 Control portion (rotation transmission mechanism)
50 Thumb shaft 51 I / O shaft 52 Hook 54 Projection 55 Control unit (Rotation transmission mechanism)
60 Shaft guide 70 Fixing plate 73 Locking groove 80 Outer cylinder 90 Cosmetic ring L Door lock H Hub

Claims (1)

In the security thumb turn of the door lock that is locked and unlocked by the operation of the cylinder from the outdoor side and the knob from the indoor side,
A knob is rotatably provided at a rear end portion of the outer cylinder of the crime prevention thumb turn, a thumb shaft is rotatably provided at a front end portion of the outer cylinder, and a shaft portion of the knob is engaged with the thumb shaft. The rotation of the thumb shaft is integrally rotated to transmit the rotation of the knob to the door lock.
A pair of button members are held in the knob, and the buttons of the button members protrude from the knob when locked, and a locking portion formed on the button member engages with a locking groove formed in the outer cylinder. To restrict the rotation of the knob and to release the restriction by pressing the button,
On the other hand, a rotation transmission mechanism is provided in which a control part formed at the tip part of the pair of button members is engaged with a control groove formed in the thumb shaft, and the thumb shaft transmitted from the outdoor side by the operation of the cylinder is provided. A crime prevention thumb turn characterized in that the restriction of the rotation of the knob is released via the rotation transmission mechanism by a rotational force.

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