JP2019112850A - Crime-prevention thumb-turn - Google Patents

Abstract

To provide a miniaturized thumb-turn in which a protrusion from a door surface is small.SOLUTION: A crime prevention thumb-turn 1 has a thumb seat 2, a knob 5 projecting forward and rotatably mounted to a thumb shaft 3 for axial rotation, and an arm member 13 provided with an engaging portion engageable with a button provided on the knob 5. When a button 8a is pushed, the engaging portion moves the arm member 13 forward while sliding a sliding projection 37 from an open end of a notch toward the inner end, and disengages a locking projection from a locking groove.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a crime prevention thumb turn attached to a door and used.

  In the past, in order to prevent illegal housing intrusion by thumb-turning, a security thumb-turn equipped with a thumb-turn turning prevention mechanism has been developed.

JP, 2006-193951, A

  However, since the prior art adds a thumb-turn turning prevention mechanism, the thumb-turn is increased in size, and there is a problem that the projecting portion from the door surface can not but be enlarged.

  Therefore, as a means for solving the above problems, the security thumb-turn according to the present invention is provided with a thumb seat having an insertion hole through which a thumb shaft is inserted, and protruding forward from the front face of the thumb seat. A knob having a pinching surface substantially perpendicular to the front face of the seat and pivotably attached to the thumb shaft, a button provided on the pinching surface, and an axial center of the thumb shaft rather than the button An arm member extending rearward along the thumb shaft on the side and a rear end portion of the arm member can slide in a longitudinal direction in a locking groove provided on an outer peripheral surface of the thumb shaft A lock piece having a lock projection which is fitted radially outward from the lock groove, a through hole through which the thumb shaft passes, and the lock projection in the forward direction. Locking groove formed to be fittable from A thumb seat bearing fixed to the thumb seat, a notch cut obliquely in the front-rear direction, and a sliding projection capable of entering and leaving the notch; And an engaging portion that allows the button and the arm member to be engaged inside, and when the button is pressed, the engaging portion moves the sliding protrusion from the open end of the notch to the far end The arm member may be moved forward while sliding toward the other, and the locking projection may be detached from the locking groove.

  Further, when the inner surface of the rear end of the locking groove is pivoted in the direction of unlocking the thumb shaft, the locking projection is formed on a cam surface which can be pushed forward, and the thumb shaft is unlocked. It is preferable that the cam surface pushes the locking projection forward to separate it from the locking groove when it is axially rotated in a direction.

  Furthermore, it is preferable that the notch is formed on the end surface on the axial center side of the thumb shaft of the button so as to have the release end toward the pinching surface.

  Furthermore, it is preferable that the notch is formed on the end surface on the axial center side of the thumb shaft of the button so as to have the release end toward the pinching surface.

  Further, it is preferable that the button is configured by a first button and a second button provided on each of a pair of the pinching surfaces provided on both sides of the thumb shaft in the knob.

  Furthermore, it is preferable that the notch is provided in each of the first button and the second button.

  According to the present invention, since the engaging portion can be accommodated inside the knob, it is possible to make the thickness of the thumb seat thinner than that of the security thumb-turn provided with the conventional thumb-turn turning prevention mechanism. As a result, it is possible to divert a thin thumb seat used for a thumb turn without a security function, which has a small protrusion from the door surface. Furthermore, it is possible to realize the miniaturization of the thumb turn than the conventional crime prevention thumb turn.

  In addition, the button is provided on each of the pair of pinching surfaces provided on both sides of the thumb shaft in the pinching, so that the door lock is released unless the first button and the second button are pressed in a direction to mutually face. It can be made unlockable. According to such a configuration, it is possible to realize a crime prevention thumb turn where it is difficult to turn the thumb turn even when the button is provided only on one of the pick faces.

  Furthermore, by providing the first engaging portion and the second engaging portion, the locking projection is not separated from the locking groove only by pressing one of the first button and the second button. Can be This makes it possible to realize a crime prevention thumb turn that further enhances the crime prevention function.

It is a whole perspective view of crime prevention thumb turn 1 in the state where button 8 is not pushed. FIG. 6 is an exploded perspective view showing the whole of the state in which the thumb 2, thumb 3 and knob 5 constituting the crime prevention thumb turn 1 are disassembled. The disassembled perspective view which decomposed | disassembled the thumb shaft 3 and the arm member 13 is shown. It is a perspective view which shows a mode that the knob 5 and the thumb shaft 3 were extracted from the thumb seat 2. FIG. It is a perspective view which shows the appearance of the knob 5 in the state which pressed the button 8. FIG. It is a perspective view which shows a mode that the thumb 5 was made to axis-rotate from the cylinder side and the knob 5 was made in the state which can be unlocked. It is a right view of the crime prevention thumb turn 1 in the state where button 8 is not pushed. It is an AA sectional view of crime prevention thumb turn 1 in the state where button 8 is not pushed. It is a BB sectional view of the crime prevention thumb turn 1 in a state where the button 8 is not pressed. It is a CC sectional view of the crime prevention thumb turn 1 in a state where the button 8 is not pressed. It is DD sectional drawing of the crime prevention thumb turn 1 in the state where the button 8 is not pressed. It is an EE sectional view of crime prevention thumb turn 1 in the state where button 8 is not pushed. It is FF sectional drawing of the crime prevention thumb turn 1 in the state where the button 8 is not pressed. It is a right view of the crime prevention thumb turn 1 in the state where button 8 was pushed. It is GG sectional drawing of the crime prevention thumb turn 1 in the state where the button 8 was pushed. It is a H-H sectional view of crime prevention thumb turn 1 in the state where button 8 was pushed. It is an II sectional view of crime prevention thumb turn 1 in the state where button 8 was pushed. It is a J-J sectional view of crime prevention thumb turn 1 in the state where button 8 was pushed. FIG. 10 is a K-K cross-sectional view of the crime prevention thumb turn 1 in a state where the button 8 is pressed. It is an L-L sectional view of crime prevention thumb turn 1 in the state where button 8 was pushed. FIG. 10 is a right side view of the crime prevention thumb turn 1 in which the thumb shaft 3 is pivoted from the cylinder side and the knob 5 can be unlocked. FIG. 7 is an M-M cross-sectional view of the crime prevention thumb turn 1 in which the thumb 5 is pivoted from the cylinder side to enable the knob 5 to be unlocked. It is a N-N sectional view of crime prevention thumb turn 1 which made thumb shaft 3 turn from a cylinder side and made it possible to unlock knob 5. It is an OO cross-sectional view of the crime prevention thumb turn 1 in which the thumb shaft 3 is pivoted from the cylinder side and the knob 5 can be unlocked. FIG. 7 is a cross-sectional view of the security thumb-turn 1 taken along the line P-P, in which the thumb shaft 3 is rotated from the cylinder side to enable the knob 5 to be unlocked. It is QQ sectional drawing of the crime prevention thumb-turn 1 which made the thumb 5 axis-rotate from the cylinder side and made the knob 5 unlockable. FIG. 7 is an R-R cross-sectional view of the crime prevention thumb turn 1 in which the thumb 5 is pivoted from the cylinder side to make it possible to unlock the knob 5; It is a right view of the crime prevention thumb turn 1 in the state where it was going to push in only button 8a. It is SS sectional drawing of the crime prevention thumb turn 1 of the state which tried to push in only the button 8a. It is TT sectional drawing of the crime prevention thumb turn 1 of the state which tried to push in only the button 8a. When trying to push only the first button 8a into the circle, the front surface of the inclined plate 38a abuts on the release end 47b of the notch 46b, and the entrance into the notch 46b is restricted An enlarged view is shown. It is a U-U sectional view of crime prevention thumb turn 1 in the state where it was going to push in only button 8a. It is a V-V sectional view of crime prevention thumb turn 1 in the state where it was going to push in only button 8a. It is WW sectional drawing of the crime prevention thumb turn 1 of the state which tried to push in only button 8a. It is XX sectional drawing of the crime prevention thumb turn 1 of the state which tried to push in only button 8a.

  Hereinafter, embodiments according to the present invention will be described in detail with reference to the drawings. In the present specification and the drawings, components having substantially the same functional configuration will be assigned the same reference numerals and redundant description will be omitted.

  FIG. 1 is an overall perspective view of the security thumb-turn 1 in an unlocked state. The thumb shaft 3 is inserted through the rear from the rear so that the thumb shaft 2 can be screwed forward to the door surface (not shown), and the knob 5 is provided on the front surface 4 of the thumb seat 2 in a protruding manner.

  The knob 5 comprises a hollow case 7 having a knob surface 6 substantially perpendicular to the front face 4 of the thumb seat 2, the knob surface 6 being horizontal in the locked state. Moreover, in the present embodiment, the pinching surface 6 is provided with a pair of pinching surfaces 6a and 6b with the thumb shaft 3 interposed therebetween.

  A first button 8a and a second button 8b are provided on each of the knobs 6a and 6b. Hereinafter, the first button 8 a and the second button 8 b may be collectively referred to as a button 8. The button 8 can be pressed against the picking surface 6.

  A person who attempts to lock and unlock the door can turn the thumb shaft 3 by pivoting the knob 5 and switch the locked state and the unlocked state of the door lock (not shown) connected to the thumb shaft 3. Can.

  The thumb seat 2 can be fixed to the door surface by means of screws inserted into screw holes 2a and 2b provided on the front surface 4.

  FIG. 2 is an exploded perspective view showing the whole of the state in which the thumb 2, thumb 3 and knob 5 constituting the crime prevention thumb turn 1 are disassembled.

  The thumb shaft 3 is formed in a rod shape in which a thumb shaft pillar 10 having a diameter smaller than that of the thumb shaft base 9 is screwed to the front end of the thumb shaft base 9. A slide piece 11 and a lock piece 12 which are provided slidably in the back and forth direction along the axial direction of the thumb shaft 3 are connected to each other in the front-rear direction to constitute an arm member 13.

  In FIG. 3, the disassembled perspective view which decomposed | disassembled the thumb shaft 3 and the arm member 13 is shown.

  In the slide piece 11, a pair of rod-like slide arm portions 14, 14 sliding along the left and right circumferential surfaces of the thumb shaft 3 are connected by a slide piece guide ring 15 through which the thumb shaft 10 can be inserted. It is integrally molded.

  In the lock piece 12, a pair of rod-like lock arms 16, 16 sliding along the left and right circumferential surfaces of the thumb shaft 3 are connected by a lock piece guide ring 17 through which the thumb shaft 10 can be inserted. It is integrally molded.

  A rear end connecting claw 18 is formed at the rear end of the slide arm 14 constituting the slide piece 11, and the front end of the lock arms 16 and 16 constituting the lock piece 12 are engaged with the rear end connecting claw 18 A matching front end connection claw 19 is formed, and the rear end connection claw 18 and the front end connection claw 19 are engaged to constitute an arm member 13 in which the slide piece 11 and the lock piece 12 are integrally interlocked. .

  Further, a lock spring 21 composed of a helical spring is mounted on the thumb shaft pillar 10. The rear end of the lock spring 21 is in contact with the front surface of the lock piece guide ring 17, and the front end of the lock spring 21 is in contact with a step surface 20 formed by increasing the diameter of the middle portion of the thumb shaft pillar 10. Become. With such a configuration, a force is applied to the arm member 13 in a direction in which it is always pushed backward by the lock spring 21.

  The lock piece guide ring 17 has an opening diameter smaller than the outer diameter of the lock spring 21 so that the thumb shaft pillar 10 can be inserted, and the rear end of the lock spring 21 is of the lock piece guide ring 17. It is formed to be able to abut on the front surface.

  On the other hand, the slide piece guide ring 15 is formed so that the opening diameter is larger than the outer diameter of the lock spring 21, and even if the slide piece 11 slides along the thumb shaft 3, the slide piece guide ring 15 Does not interfere Furthermore, the slide piece guide ring 15 is formed larger than the outer diameter of the enlarged diameter portion 22 of the thumb shaft pillar 10, and when the slide piece 11 slides along the thumb shaft 3, the periphery of the enlarged diameter portion 22. By moving within the range facing the surface, the guide function of the slide piece 11 is exhibited while the interference with the lock spring 21 is more effectively avoided.

  As shown in FIG. 3, the outer peripheral surface of the thumb shaft base 9 is formed with locking grooves 23, 23 into which the lock arms 16, 16 can be slidably fitted in the front-rear direction. As shown in FIG. 2, the lock arms 16, 16 are configured to protrude radially outward from the locking grooves 23, 23 in a state of being fitted into the locking grooves 23, 23 as shown in FIG. The projections 24 and 24 are formed.

  As shown in FIG. 2, a fixing recess 26 in which a thumb bearing 25 can be inserted and fixed at the center of the thumb seat 2 and a central portion of the fixing recess 26 are formed to allow insertion of the thumb shaft 3. An insertion hole 27 is formed.

  The thumb seat bearing 25 is, as shown in FIG. 4, a through hole 28 formed to be able to penetrate the thumb shaft 3 and a lock groove 29 formed to be able to fit the lock projections 24 and 24 from the front direction. It is a member formed in an annular shape having 29 and is formed with a ridge 30 extending in the outer peripheral direction from the front end surface.

  In the inner side surface of the fixed recess 26, rotation prevention grooves 31, 31 are formed at positions facing to the left and right, and rotation prevention protrusions 32, 32 are provided protruding from the left and right outer peripheral surfaces of the thumb seat bearing 25. The thumb seat bearing 25 fitted in the fixing recess 26 can be fixed so as not to rotate by inserting the

  As shown in FIG. 2, the lock grooves 29, 29 are provided at positions facing the lock arms 16, 16 in the front-rear direction, respectively, and have a notch structure from the front surface to the inner peripheral surface of the thumb seat bearing 25. It is formed.

  A thumb piece guide 33 is installed at a position facing the front surface of the thumb bearing 25. An annular disc 34 is formed at the rear end of the thumbpiece guide 33. A guide plate 35 of an arc-shaped plate formed along the peripheral surface of the thumb shaft base 9 is divided into upper and lower parts and projected forward on the front surface of the disk 34. The left and right end portions formed by dividing the guide plate 35 are formed into lock piece guides 36 each formed of a bent portion which is bent radially outward. The lock piece guide 36 has a function of suppressing axial rotation of the lock piece 12 sliding in the front-rear direction.

  On the outer side surfaces of the slide arms 14 and 14 of the slide piece 11, slide protrusions 37 and 38 which are provided to protrude outward are provided.

  In FIG. 2, the sliding protrusion 37 provided in the right-hand direction toward the front of the thumb seat 2 is an inclined plate 37 a inclined from the front to the rear as it goes downward from above, and a sliding plate 37 a It comprises the engagement guide 37b bent downward from the outer side surface.

Further, in FIG. 2, the sliding projection 38 provided in the left-hand direction toward the front face of the thumb seat 2 has an inclined plate 38a inclined from the rear to the front and an inclined plate 38a. The engaging guide 38b is formed by being bent upward from the outer surface of the connector.

  As shown in FIG. 2, the first button 8 a and the second button 8 b are disposed on the upper side and the lower side of the thumb axle 10 with the axial center Y of the thumb axle 10 as a symmetry axis. The first button 8a and the second button 8b are provided with spring mounting columns 39, 39 and spring receivers 40, 40 respectively, and the spring mounting is performed at a position where the spring mounting column and the spring receiver face each other. The springs 41, 41 are attached to the columns and inserted into the spring receivers 40, 40. The springs 41, 41 apply a force in a direction to resist the pushing force of the button 8 and push back the original position when the pushing force from the pushed button 8 is released.

  As shown in FIG. 2, the button 8 extends from the circumferential surface of the pushing convex portion 42 (42 a, 42 b) pushed toward the axial center Y while directly touching with fingers and the end circumferential surface on the axial center Y side of the pushing convex portion 42. It consists of the stop plate 43 (43a, 43b) which comes out.

  As shown in FIG. 2, button holes 44 (44a, 44b) are formed in the knob surface 6 of the case 7 so that the upper part of the convex portion 42 can be projected to the outside. The stop plate 43 has an outer edge shape that is larger than the respective button holes 44. As a result, the stop plate 43 abuts the inner surface of the knob 5 with the button 8 whose pressing force is released to stop the force of the springs 41 and 41, as shown in FIG. It can be held in the position where the height protrudes.

  Further, notches 46 (46a, 46b) are formed in side walls 45 (45a, 45b) extending perpendicularly from the retaining plate 43 with respect to the side of the axis Y. The notches 46 are rectilinear notches having a narrow width in the front and back, and the buttons 8 are attached from the release ends 47 (47a, 47b) formed at the edge of the side wall 45 on the side of the axis center Y It forms in the shape which cut in the direction of the front or the back diagonally as it goes to the knob surface 6 of the knob 5. As shown in FIG.

  In the present embodiment, as shown in FIG. 2, the notch 46 a is provided on the side wall 45 a extending downward from the right side of the first button 8 a disposed above the front of the thumb seat 2. Become. The notch 46a is formed in a shape that is cut obliquely toward the front as it goes from the free end 47a to the picking surface 6a.

  On the other hand, as shown in FIG. 2, the notch 46 b is provided on a side wall 45 b extending upward from the left side of the second button 8 b disposed below the front of the thumb seat 2. The notch 46b is formed in a shape which is cut obliquely toward the front as it goes from the free end 47b to the picking surface 6b.

  The sliding projection 37, together with the notch 46a, constitutes an engaging portion 49a in which the inclined plate 37a slides from the release end 47a of the notch 46a toward the far end 48a when the first button 8a is pushed. On the other hand, the sliding projection 38, together with the notch 46b, constitutes an engaging portion 49b in which the inclined plate 38a slides toward the far end 48b from the release end 47b of the notch 46b when the second button 8b is pushed. .

  The case 7 is divided into upper and lower parts, and the knob 5 is configured by sandwiching the front end portion of the thumb shaft 3, the arm member 13, and the button 8 inside. The rear end of the case 7 is released, and the guide plate 35 of the thumb piece guide 33 can be fitted. As a result, the rear end portions of the lock arms 16 and 16 of the lock piece 12 can be moved backward and backward. The case 7 in which the knob 5 is formed is fixed by screws 50, 50.

  Further, cylindrical spring holes 51, 51 are formed on the upper and lower surfaces of the thumb shaft base 9, and the spring 52 is provided in the spring hole 51 and the click ball 53 installed at the outer end of the small spring 52. , 53 are accommodated. Recesses 54 are formed in the inner surface of the case 7, and a part of the outer surface of the click ball 53 can be fitted while being pressed against the small spring 52. When the operator rotates the thumb shaft 3 from the cylinder side to lock the lock, the click position when the click ball 53 gets stuck in the depression 54 is transmitted to the finger of the operator, so that the lock position can be confirmed. .

As shown in FIG. 2, a retaining ring groove 56 into which a retaining ring 55 is fitted is formed on the circumferential surface of the central portion of the thumb shaft base 9. A washer 57 and a snap ring 55 are fitted from the rear surface of the thumb seat 2 to the thumb shaft 3 inserted through the insertion hole 27 of the thumb seat 2 to prevent the thumb shaft 3 from falling off the thumb seat 2.

  Further, on the circumferential surface of the rear end portion of the thumb shaft base 9, a key groove 58 having a plane perpendicular to the axial center is formed from all sides toward the rear end, and the rear end face is formed in a cruciform shape. Become. When the key groove 58 is inserted into a hub of a door lock (not shown) and the thumb shaft 3 is rotated, locking and unlocking of the door lock can be performed by the rotational force of the thumb shaft 3. The thumb shaft 3 can be rotated by a key or the like inserted into a cylinder provided on the opposite side across the door, as well as when the knob 5 is rotated.

As shown in FIGS . 7 to 13 , in a state where the lock projections 24, 24 are fitted in the lock grooves 29, 29 and the first button 8 a and the second button 8 b are released, the lock spring 21 is a lock piece We are pushing 12 backwards. In this case, even if it is attempted to pivot the knob 5 without pushing the first button 8a and the second button 8b, the axial rotation of the locking projections 24, 24 fitted in the lock grooves 29, 29 is made by the thumb bearing 25 Limited Therefore, the thumb shaft 3 can not be pivoted, and the locked door lock can not be unlocked.

  Further, in the present embodiment, the arm member 13 is moved forward unless both the first button 8a and the second button 8b are pressed in the direction in which they abut each other, and the locking projections 24 from the locking grooves 29, 29. , 24 can not be released. In the case where the button 8 is provided only on one of the knob surfaces 6, the locking projections 24 can be released only by either depressing or pushing up the button 8.

  However, according to the configuration in the present embodiment, in order to release the locking projections 24, 24, a more complicated operation is required than in the case where the button 8 is provided only on one of the grip surfaces 6, It is more difficult to turn the thumb turn, and it is possible to realize the crime prevention thumb turn with high security.

When a person who tries to unlock the door lock presses the first button 8a and the second button 8b simultaneously, as shown in FIGS. 14 to 20 , the sliding projections 37 and 38 respectively cut out the notches 46a and 46b. It slides from the release end 47a, 47b toward the far end 48a, 48b, and the engagement portion 49a, 49b is deeply engaged, thereby moving the arm member 13 forward. As a result, as shown in FIG. 5, the lock projections 24 can be detached forward from the lock grooves 29. Therefore, by pushing in the first button 8a and the second button 8b, it is possible to release the restriction on the axial rotation of the thumb shaft 3.

  Even when the first button 8a and the second button 8b are pushed in, the lock arms 16, 16 of the lock piece 12 are engaged with the locking grooves 23, 23, so the knob 5 is The pivoting force can be transmitted by the thumb shaft 3. Therefore, when the knob 5 is pivoted while the first button 8a and the second button 8b are pressed in, the thumb shaft 3 can be pivoted, and the locked door lock can be unlocked.

  Next, the operation of the crime prevention thumb turn 1 when the thumb shaft 3 is directly rotated will be described.

  As an example in the case where the thumb shaft 3 is directly rotated, when the cylinder provided on the door surface opposite to the door surface on which the thumb seat 2 is attached and the thumb shaft 3 are connected, There is a case where the thumb shaft 3 is rotated by rotating the key inserted into the cylinder.

As shown in FIG. 22 , cam surfaces 60 (60a, 60b) are formed on the rear end inner surface 59 (59a, 59b) of the locking grooves 23 , 23 . In the present embodiment, the cam surface 60a is formed at the lower corner portion of the rear end inner surface 59a, and the cam surface 60b is formed at the upper corner portion of the rear end inner surface 59b. The cam surface 60 is formed in an inclined surface which is inclined forward of the central flat portion of the rear end inner surface 59. When the thumb shaft 3 is pivoted in the unlocking direction, as shown in FIG. 6 and FIGS. 21 to 27 , the locking projections 24 and 24 are pushed forward to lock the lock piece 12 in the locking grooves 29 and 29. Let go of. When the key is further turned, the shaft can be rotated beyond the limitation of the shaft rotation of the thumb shaft 3, and the locked door lock can be unlocked.

  Next, in the present embodiment, a crime prevention mechanism when only one of the first button 8 a and the second button 8 b is pressed will be described. As an example, the operation in the case where only the first button 8a is pressed will be described based on the drawings.

As shown in FIGS. 28 to 34, when only the first button 8a is to be pushed in, the front surface of the inclined plate 37a abuts on the release end 47b of the notch 46b and the entry into the notch 46b is inhibited. Ru. Therefore, even if only the first button 8a is pushed, the arm member 13 can not slide forward, and the lock projection 24 can not be detached from the lock groove 29. Therefore, even if only the first button 8a is pressed, the limitation of the axial rotation of the thumb shaft 3 can not be released. In this case, the first button 8a hardly sinks into the button hole 44a. This is the same even when only the second button 8b is pressed.

  In order to make it impossible to release the limitation of the axial rotation of the thumb shaft 3 when trying to press only one of the buttons 8 as described above, the button 8 is provided as a pair with the thumb shaft 3 interposed therebetween. It is preferable to be comprised from the 1st button 8a and the 2nd button 8b. Furthermore, the first button 8a and the second button 8b are provided with structures corresponding to the sliding projections 37, 38 and the notches 46a, 46b, respectively, and the sliding projections 37 provided on the respective buttons 8, Preferably, the engagement portion 49 in which the notch 38a and the notch 46a are engaged with each other is formed. In the case where only one sliding projection is provided on one button 8 and only the notch is provided on the other button 8, it is easy to push only one of the buttons 8. This is because there is a possibility that the effect of preventing the restriction of the axial rotation of the thumb shaft 3 from being released can not be sufficiently obtained when the sliding projection enters into the notch.

  In particular, vertical surfaces 37c and 38c are formed at the front end of the inclined plates 37a and 38a in order to make it impossible to release the limitation of the axial rotation of the thumb shaft 3 even if only one button 8 is pushed. It is preferable that By providing the vertical surfaces 37c and 38c on the front end face of the inclined plates 37a and 38a, when trying to press one button 8, the vertical surfaces 37c on the release ends 47a and 47b corresponding to the inclined plates 37a and 38a. , 38c abut, it is possible to effectively stop the forward movement of the arm member 13 in the direction perpendicular to the vertical surfaces 37c, 38c.

DESCRIPTION OF SYMBOLS 1 Security thumb-turn 2 Thumb seat 3 Thumb shaft 5 Picking 7 Case 8 button 11 Slide piece 12 Lock piece 13 Arm member 21 Lock spring 23 Locking groove 24 Protruding portion for locking 25 Thumb bearing 27 Insertion hole 28 Through hole 29 Locking groove 37 Slide Moving projection 38 Sliding projection 45 Side wall 46 Notch 47 Release end 48 Back end 49 Engagement portion 59 Rear end inner surface 60 Cam surface

Claims (5)

A thumb seat having an insertion hole through which a thumb shaft is inserted;
A knob having a pinching surface projecting forward from the front face of the thumb seat and having a generally perpendicular pinching surface with respect to the front face of the thumb seat, and pivotably attached to the thumb shaft;
A button provided on the pick surface;
An arm member extending rearward along the thumb shaft on the axial center side of the thumb shaft relative to the button;
The rear end portion of the arm member is slidably fitted in a locking groove formed on the outer peripheral surface of the thumb shaft in the front-rear direction and protruding radially outward from the locking groove A lock piece having a locking projection formed thereon;
A thumb seat bearing including a through hole through which the thumb shaft is penetrated, and a lock groove formed such that the lock projection can be inserted from the front direction, and fixed to the thumb seat;
A notch formed obliquely in the front-rear direction, and a sliding projection which can be inserted into the notch, and an engagement that enables the button and the arm member to be engaged inside the knob With the department,
When the button is pressed, the engaging portion moves the arm member forward while sliding the sliding projection from the release end of the notch toward the far end, and the locking projection A crime prevention thumb turn characterized by being detached from the lock groove. The rear end inner surface of the locking groove is formed in a cam surface which can push the locking projection forward when the shaft is rotated in a direction to unlock the thumb shaft.
The security thumb-turn according to claim 1, wherein when the thumb shaft is pivoted in the unlocking direction, the cam surface pushes the locking projection forward to separate it from the locking groove. The crime prevention according to claim 1 or 2, wherein the notch has the open end on the end face on the axial center side of the thumb shaft of the button and is formed toward the pinching surface. Sam turn. The said button is comprised by the 1st button and 2nd button which are provided in each of a pair of said pinching surface provided on both sides of the said thumb shaft in the said knob. The crime prevention thumb turn described in any of 3. The security thumb-turn according to claim 4, wherein the notch is provided in each of the first button and the second button.

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