JP6734523B2 - Security thumb turn - Google Patents

Description

The present invention relates to a crime prevention thumb turn attached to a door for use.

Conventionally, a crime prevention thumb turn having a thumb turn turning prevention mechanism has been developed in order to prevent illegal intrusion into a house by turning the thumb turn.

JP 2006-193951 A

However, the prior art has a problem in that the thumb turn is increased in size because the thumb turn prevention mechanism is added, and the projection portion from the door surface must be enlarged.

Therefore, as a means for solving the above-mentioned problems, the crime prevention thumb turn according to the present invention includes a thumb seat having an insertion hole formed by inserting a thumb shaft, and the thumb seat protruding forward from the front surface of the thumb seat. A knob that has a knob surface that is substantially perpendicular to the front surface of the seat and that is attached so as to be axially rotatable with the thumb shaft; a button that is provided on the knob surface; On the side, an arm member extending rearward along the thumb shaft and a rear end portion of the arm member are configured, and can be slid in a front-rear direction in a locking groove formed on an outer peripheral surface of the thumb shaft. A lock piece having a locking projection that is fitted into the locking groove and projects radially outward from the locking groove, a through hole through which the thumb shaft penetrates, and the locking projection in the forward direction. A thumb seat bearing fixed to the thumb seat, a notch obliquely cut in the front-rear direction, and a sliding protrusion capable of entering and leaving the notch. And an engaging portion capable of engaging the button and the arm member inside the knob, and when the button is pushed in, the engaging portion causes the sliding protrusion to move. It is characterized in that the arm member is moved forward while sliding from the open end of the notch toward the rear end, and at the same time, the lock projection is detached from the lock groove.

Further, when the inner surface of the rear end of the locking groove is axially rotated in a direction to unlock the thumb shaft, it is formed into a cam surface capable of pushing the locking protrusion forward, and unlocks the thumb shaft. It is also preferable that the cam surface pushes the locking protrusion forward and disengages it from the lock groove when the shaft is rotated in the direction.

Further, it is preferable that the notch is formed toward the knob surface with the release end on the end surface of the button on the axial center side of the thumb shaft.

Furthermore, it is also preferable that the notch is formed toward the pinching surface with the release end on the end face of the button on the axial center side of the thumb shaft.

Further, it is also preferable that the button is configured by a first button and a second button provided on each of the pair of the knob surfaces that are provided with the thumb shaft sandwiched in the knob.

Further, it is also preferable that the cutout is provided in each of the first button and the second button.

According to the present invention, since the engaging portion can be housed inside the knob, the thickness of the thumb seat can be made thinner than that of the crime prevention thumb turn having the conventional thumb turn turning prevention mechanism. As a result, it is possible to use a thin thumb seat used for a thumb turn having a small protruding portion from the door surface and having no crime prevention function. Further, the thumb turn can be made smaller than the conventional crime prevention thumb turn.

Also, since the buttons are provided on each of the pair of knob surfaces that are provided with the thumb shaft sandwiched in the knob, the door lock must be unlocked unless the first button and the second button are pressed in the directions to abut each other. It can be locked. According to such a configuration, it is possible to realize a crime prevention thumb turn in which it is difficult to turn the thumb turn even when the button is provided only on one of the grip surfaces.

Further, by providing the first engaging portion and the second engaging portion, it is possible to prevent the locking protrusion from being disengaged from the lock groove only by pressing one of the first button and the second button. Can be As a result, it is possible to realize a crime prevention thumb turn having a further enhanced crime prevention function.

It is the whole security thumb turn 1 perspective view in the state where button 8 is not pushed. It is an exploded perspective view showing the whole thumb seat 2, thumb shaft 3, and knob 5 which constitute crime prevention thumb turn 1 disassembled. The exploded perspective view which decomposed|disassembled the thumb shaft 3 and the arm member 13 is shown. FIG. 3 is a perspective view showing a state in which a knob 5 and a thumb shaft 3 are pulled out from a thumb seat 2. It is a perspective view showing a state of the knob 5 in a state in which a button 8 is pressed. FIG. 7 is a perspective view showing a state in which the thumb shaft 3 is rotated from the cylinder side to make the knob 5 unlockable. It is a right side view of 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 crime prevention thumb turn 1 in the state where button 8 is not pressed. It is CC sectional drawing of the security thumb turn 1 in the 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 EE sectional drawing of the security thumb turn 1 in the state where the button 8 is not pressed. 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 side view of 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 pressed. It is a HH sectional view of crime prevention thumb turn 1 in the state where button 8 was pushed. It is an II sectional view of the crime prevention thumb turn 1 in the state where the button 8 is pressed. It is a JJ sectional view of the crime prevention thumb turn 1 in a state where the button 8 is pressed. It is KK sectional drawing of the crime prevention thumb turn 1 in the state where the button 8 was pressed. It is a LL sectional view of the crime prevention thumb turn 1 in a state where a button 8 is pressed. FIG. 4 is a right side view of the security thumb turn 1 in which the thumb shaft 3 can be rotated from the cylinder side to unlock the knob 5. It is MM sectional drawing of the crime prevention thumb turn 1 which made the thumb shaft 3 the axis rotation from the cylinder side, and made the state which can unlock the knob 5. It is NN sectional drawing of the security thumb turn 1 which made the thumb shaft 3 the axis rotation from the cylinder side, and made the state which can unlock the knob 5. FIG. 3 is a cross-sectional view taken along line O-O of the security thumb turn 1 in which the thumb shaft 3 can be rotated from the cylinder side to unlock the knob 5. FIG. 7 is a P-P cross-sectional view of the security thumb turn 1 in which the thumb shaft 3 is rotated from the cylinder side so that the knob 5 can be unlocked. It is a QQ sectional view of the crime prevention thumb turn 1 in which the thumb shaft 3 is rotated from the cylinder side so that the knob 5 can be unlocked. It is an RR sectional view of the crime prevention thumb turn 1 in which the thumb shaft 3 is rotated from the cylinder side so that the knob 5 can be unlocked. It is a right side view of crime prevention thumb turn 1 in the state where it was going to push only button 8a. It is SS sectional drawing of the crime prevention thumb turn 1 in the state which tried to push in only the button 8a. It is TT sectional drawing of the crime prevention thumb turn 1 in the state which tried to push in only the button 8a. When only the first button 8a is pushed into the circle, the front surface of the inclined plate 38a comes into contact with the open end 47b of the cutout 46b to restrict entry into the cutout 46b. An enlarged view is shown. It is UU sectional drawing of the crime prevention thumb turn 1 in the state which tried to push in only the button 8a. It is a VV sectional view of crime prevention thumb turn 1 in the state where it was going to push only button 8a. It is WW sectional drawing of the crime prevention thumb turn 1 in the state which tried to push in only the button 8a. It is XX sectional drawing of the crime prevention thumb turn 1 in the state which tried to push in only the button 8a.

Hereinafter, embodiments according to the present invention will be described in detail with reference to the drawings. In this specification and the drawings, constituent elements having substantially the same functional configuration are designated by the same reference numerals, and a duplicate description will be omitted.

FIG. 1 is an overall perspective view of the crime prevention thumb turn 1 in an unlocked state. A thumb seat 2 which can be screwed is inserted into a door surface (not shown) by penetrating a thumb shaft 3 from the rear side to the front side, and a knob 5 is projectingly provided on a front surface 4 of the thumb seat 2.

The knob 5 includes a hollow case 7 having a knob surface 6 that is substantially vertical to the front surface 4 of the thumb seat 2, and the knob surface 6 is horizontal in the locked state. In addition, in the present embodiment, the knob surface 6 is provided with a pair of knob 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 grip surfaces 6a and 6b. Hereinafter, the first button 8a and the second button 8b may be collectively referred to as the button 8. The button 8 can be pressed into the knob surface 6.

A person who wants to lock/unlock the door can also rotate the thumb shaft 3 by rotating the knob 5 axially, and can switch between a locked state and an unlocked state of a door lock (not shown) connected to the thumb shaft 3. You can

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

FIG. 2 is an exploded perspective view showing the whole of the thumb seat 2, the thumb shaft 3, and the knob 5 constituting the security thumb turn 1 in an exploded state.

The thumb shaft 3 has a rod-like shape in which a thumb shaft column 10 having a diameter smaller than that of the thumb shaft base 9 is screwed into the front end of the thumb shaft base 9. On the thumb shaft column 10, a slide piece 11 and a lock piece 12, which are provided so as to be slidable back and forth along the axial direction of the thumb shaft 3, are connected to each other in the front-back direction to form an arm member 13.

FIG. 3 shows an exploded perspective view in which the thumb shaft 3 and the arm member 13 are disassembled.

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

In the lock piece 12, a pair of rod-shaped lock arm portions 16, 16 that slide along the left and right peripheral surfaces of the thumb shaft 3 are connected by a lock piece guide ring 17 through which the thumb shaft column 10 can be inserted. It is integrally molded.

A rear end connecting pawl 18 is formed on a rear end of the slide arm portion 14 forming the slide piece 11, and a rear end connecting pawl 18 is engaged with each other on front ends of the lock arm portions 16 and 16 forming the lock piece 12. A front end connecting claw 19 that can be fitted is formed, and a rear end connecting claw 18 and a front end connecting claw 19 are engaged with each other to form an arm member 13 in which the slide piece 11 and the lock piece 12 are integrally linked. ..

A lock spring 21 made of a spiral spring is mounted on the thumb shaft 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 the step surface 20 formed by expanding the intermediate portion of the thumb shaft column 10. It becomes. With such a configuration, a force is applied to the arm member 13 by the lock spring 21 in a direction in which the arm member 13 is always pressed backward.

Since the lock piece guide ring 17 has an opening diameter smaller than the outer diameter of the lock spring 21, the thumb shaft column 10 can be inserted, and the rear end of the lock spring 21 has the lock piece guide ring 17. It is formed so that it can contact 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 move to the lock spring 21. Do not interfere. Further, the slide piece guide ring 15 is formed to have a larger diameter than the outer diameter of the enlarged diameter portion 22 of the thumb shaft column 10 and, when the slide piece 11 slides along the thumb shaft 3, the circumference of the enlarged diameter portion 22. By moving within the range of facing the surface, the guide function of the slide piece 11 is exhibited while more effectively avoiding the interference with the lock spring 21.

As shown in FIG. 3, locking grooves 23, 23 into which the lock arms 16, 16 are slidably fitted in the front-rear direction are formed on the outer peripheral surface of the thumb shaft base 9. As shown in FIG. 2, the lock arms 16, 16 are locked in the locking grooves 23, 23 in a state of being fitted in the locking grooves 23, 23 and projecting radially outward from the locking grooves 23, 23. The projecting portions 24, 24 are formed.

As shown in FIG. 2, a fixing recess 26 into which a thumb seat bearing 25 can be fitted and fixed in the center of the thumb seat 2, and a thumb shaft 3 that can be inserted through the central portion of the fixing recess 26. And the inserted insertion hole 27 is formed.

As shown in FIG. 4, the thumb seat bearing 25 has a through hole 28 formed so as to penetrate the thumb shaft 3 and a lock groove 29 formed so that the locking projections 24, 24 can be fitted from the front side. It is a member formed in an annular shape having 29, and is formed with a collar 30 extending from the front end face in the outer peripheral direction.

Anti-rotation protrusions 32, 32 are formed on the inner side surface of the fixed recessed portion 26, which are formed with anti-rotation grooves 31, 31 at positions facing left and right and project from the left and right outer peripheral surfaces of the thumb seat bearing 25. The thumb seat bearing 25 fitted in the fixed recess 26 can be fixed so as not to rotate by fitting.

As shown in FIG. 2, the lock grooves 29, 29 are provided at positions facing the lock arm portions 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 seat bearing 25. An annular disk 34 is formed at the rear end of the thumb piece guide 33. On the front surface of the disk 34, a guide plate 35, which is an arc-shaped plate body formed along the peripheral surface of the thumb shaft base 9, is vertically divided and protrudes forward. The left and right ends of the guide plate 35 that are divided are formed into lock piece guides 36 that are bent portions that are bent outward in the radial direction. 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 arm portions 14, 14 of the slide piece 11, there are provided sliding protrusion portions 37, 38 which are protruded outward.

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

Further, in FIG. 2, the sliding projection 38, which is provided so as to project in the left-hand direction toward the front surface of the thumb seat 2, has a slanted plate 38a and a slanted plate 38a that are slanted from the rear to the front as going from the upper side to the lower side. Of the engaging guide 38b which is bent upward from the outer side surface of the.

As shown in FIG. 2, the first button 8a and the second button 8b are arranged on the upper side and the lower side of the thumb shaft column 10 with the axis Y of the thumb shaft column 10 as the axis of symmetry. 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 columns and the spring bearings face each other at a position where the springs are mounted. The columns are provided with springs 41, 41, and are inserted into the spring receivers 40, 40. The springs 41, 41 apply a force in a direction that resists the pushing force of the button 8, and when the pushing force of the pushed button 8 is released, the springs 41, 41 return to the original position.

As shown in FIG. 2, the button 8 extends from the pushing convex portion 42 (42a, 42b) that is pushed toward the axial center Y while directly touching it with a finger and from the peripheral surface of the pushing convex portion 42 on the axial center Y side. It is composed of the stopper plates 43 (43a, 43b) that are extended.

As shown in FIG. 2, the knob surface 6 of the case 7 is formed with button holes 44 (44a, 44b) that allow the upper portion of the convex portion 42 to project to the outside. The stop plate 43 has an outer edge shape larger than each button hole 44. As a result, the stopper plate 43 abuts the inner surface of the knob 5 to stop the force of the springs 41, 41 from the button 8 in which the pushing force has been released, and as shown in FIG. It can be kept in a position where it protrudes.

Furthermore, notches 46 (46a, 46b) are formed on the side walls 45 (45a, 45b) extending perpendicularly to the axial center Y side from the stopper plate 43. The notch 46 is a linear notch having a narrow width in the front and rear, and each button 8 is attached from the release end 47 (47a, 47b) formed at the edge of the side wall 45 on the axial center Y side. It is formed in a shape that is obliquely cut forward or backward as it goes toward the picking surface 6 of the knob 5.

In the present embodiment, as shown in FIG. 2, the notch 46a is provided in the side wall 45a extending downward from the right side of the first button 8a arranged above the front of the thumb seat 2. It becomes. The notch 46a is formed in a shape that is obliquely cut forward toward the picking surface 6a from the open end 47a.

On the other hand, as shown in FIG. 2, the notch 46b is provided in the side wall 45b extending upward from the left side of the second button 8b arranged on the lower side with respect to the front surface of the thumb seat 2. The notch 46b is formed in a shape that is obliquely cut forward toward the grip surface 6b from the open end 47b.

The sliding protrusion 37 constitutes, together with the cutout 46a, an engaging portion 49a with which the inclined plate 37a slides from the open end 47a of the cutout 46a toward the rear end 48a when the first button 8a is pressed. On the other hand, the sliding protrusion 38 constitutes, together with the cutout 46b, an engaging portion 49b in which the inclined plate 38a slides from the open end 47b of the cutout 46b toward the rear end 48b when the second button 8b is pressed. ..

The case 7 is divided into upper and lower parts, and the front end of the thumb shaft 3, the arm member 13, and the button 8 are sandwiched inside to form the knob 5. The rear end of the case 7 is released so that the guide plate 35 of the thumb piece guide 33 can be fitted therein. Thereby, the rear ends of the lock arms 16 and 16 of the lock piece 12 can be projected and retracted rearward. The case 7 having the knob 5 is fixed by screws 50, 50.

Further, cylindrical spring holes 51, 51 are formed in the upper and lower surfaces of the thumb shaft base 9, and small springs 52, 52 are formed in the spring hole 51, and a click ball 53 installed at an outer end of the small spring 52. , 53 are accommodated. The case 7 is formed with depressions 54, 54, 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 locks the thumb shaft 3 by rotating the thumb shaft 3 from the cylinder side, the click feeling when the click ball 53 fits into the recess 54 is transmitted to the operator's finger, whereby the locked 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 peripheral surface of the central portion of the thumb shaft base 9. The washer 57 and the retaining ring 55 are fitted from the rear surface of the thumb seat 2 to the thumb shaft 3 that has been inserted through the through hole 27 of the thumb seat 2 to prevent the thumb shaft 3 from falling off the thumb seat 2.

Further, on the peripheral surface of the rear end of the thumb shaft base 9, there are formed key grooves 58 each of which is a surface perpendicular to the shaft center from four sides, and the rear end is formed in a cross shape. It becomes. When the keyway 58 is inserted into a door lock hub (not shown) and the thumb shaft 3 is rotated, the door lock can be locked and unlocked by the rotational force of the thumb shaft 3. The thumb shaft 3 can be rotated not only by rotating the knob 5 but also by a key or the like inserted in a cylinder provided on the opposite side of the door.

As shown in FIGS . 7 to 13 , when the locking protrusions 24, 24 are fitted into the lock grooves 29, 29, and the first button 8a and the second button 8b are released, the lock spring 21 locks the lock piece. 12 is pushed backwards. In this case, even if an attempt is made to axially rotate the knob 5 without pushing in 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 caused by the thumb seat bearing 25. Limited. Therefore, the thumb shaft 3 cannot be rotated and the door lock in the locked state cannot be unlocked.

In addition, in the present embodiment, unless both the first button 8a and the second button 8b are pressed in the direction of butting each other, the arm member 13 is moved forward, and the locking projections 24 are moved from the lock grooves 29, 29. , 24 cannot be released. When the button 8 is provided only on one of the knob surfaces 6, the locking projections 24, 24 can be released only by pushing down or pushing up the button 8.

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

When a person who tries to unlock the door lock pushes in the first button 8a and the second button 8b at the same time, as shown in FIGS. 14 to 20 , the sliding protrusions 37 and 38 have notches 46a and 46b, respectively. Along with the sliding ends 47a, 47b toward the rear ends 48a, 48b, and the engaging portions 49a, 49b deeply mesh with each other, thereby moving the arm member 13 forward. Thereby, as shown in FIG. 5, the locking protrusions 24, 24 can be detached forward from the lock grooves 29, 29. Therefore, by pressing the first button 8a and the second button 8b, the restriction on the axial rotation of the thumb shaft 3 can be released.

Further, even when the first button 8a and the second button 8b are pushed in, the lock arms 16 of the lock piece 12 are engaged with the locking grooves 23, 23, so that the knob 5 can be removed. The force for rotating the shaft can be transmitted by the thumb shaft 3. Therefore, when the knob 5 is axially rotated while the first button 8a and the second button 8b are pushed, the thumb shaft 3 can be axially rotated, 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 of the case where the thumb shaft 3 is directly rotated, when the cylinder provided on the door surface opposite to the door surface to which the thumb seat 2 is attached and the thumb shaft 3 are connected, For example, the thumb shaft 3 may be rotated by rotating the key inserted in the cylinder.

As shown in FIG. 22 , cam surfaces 60 (60a, 60b) are formed on the rear end inner surfaces 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 as an inclined surface that is inclined forward of the central flat portion of the rear end inner surface 59. When the thumb shaft 3 is rotated in the unlocking direction, as shown in FIG. 6 and FIGS. Disengage from. When the key is further turned, the thumb shaft 3 can be rotated beyond the limit of the shaft rotation, and the door lock that has been locked can be unlocked.

Next, in the present embodiment, the crime prevention mechanism when only either the first button 8a or the second button 8b is pushed will be described. As an example, an operation when only the first button 8a is pressed will be described with reference to the drawings.

As shown in FIGS. 28 to 34, when only the first button 8a is pressed, the front surface of the inclined plate 37a abuts on the open end 47b of the cutout 46b and the entry into the cutout 46b is obstructed. It Therefore, even if only the first button 8a is pushed in, the arm member 13 cannot be slid forward, and the locking protrusion 24 cannot be detached from the lock groove 29. Therefore, even if only the first button 8a is pushed, the limitation of the axial rotation of the thumb shaft 3 cannot 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 pushed.

In order to prevent the restriction of the axial rotation of the thumb shaft 3 from being released when only one of the buttons 8 is pushed in, the buttons 8 are provided as a pair with the thumb shaft 3 sandwiched therebetween. It is preferably composed of a first button 8a and a second button 8b. Further, the first button 8a and the second button 8b are provided with structures corresponding to the sliding protrusions 37, 38 and the notches 46a, 46b, respectively, and the sliding protrusions 37, 38 provided on the respective buttons 8 are provided. 38 and the notches 46a and 46b preferably form an engaging portion 49 that meshes with each other. When one button 8 is provided with only the sliding protrusion and the other button 8 is provided with only the notch, it is easy to push only one button 8 This is because there is a possibility that the sliding protrusion may enter the notch and the effect of preventing the restriction of the axial rotation of the thumb shaft 3 from being released cannot be sufficiently obtained.

In particular, vertical surfaces 37c, 38c are formed at the front ends of the inclined plates 37a, 38a in order to prevent the restriction of the axial rotation of the thumb shaft 3 from being released even if only one of the buttons 8 is pushed in. It is preferable that By providing the vertical surfaces 37c, 38c on the front end surfaces of the inclined plates 37a, 38a, when one button 8 is to be pushed, the vertical surfaces 37c are formed on the release ends 47a, 47b corresponding to the inclined plates 37a, 38a. , 38c are in contact with each other, it is possible to effectively stop the movement of the arm member 13 to the front, which is a direction perpendicular to the vertical surfaces 37c, 38c.

1 Security Thumb Turn 2 Thumb Seat 3 Thumb Shaft 5 Pick 7 Case 8 Button 11 Slide Piece 12 Lock Piece 13 Arm Member 21 Lock Spring 23 Locking Groove 24 Lock Protrusion 25 Thumb Seat Bearing 27 Insertion Hole 28 Through Hole 29 Lock Groove 37 Sliding Moving protrusion 38 Sliding protrusion 45 Side wall 46 Notch 47 Release end 48 Inner end 49 Engaging portion 59 Rear end inner surface 60 Cam surface

Claims (5)

A thumb seat having an insertion hole formed by inserting the thumb shaft,
A knob that protrudes forward from the front surface of the thumb seat and has a knob surface that is substantially vertical to the front surface of the thumb seat, and is attached so as to be axially rotatable with the thumb shaft.
A button provided on the knob surface,
An arm member extending rearward along the thumb shaft on the axial center side of the thumb shaft with respect to the button,
The arm member constitutes a rear end portion of the arm member, is fitted in a locking groove formed on the outer peripheral surface of the thumb shaft so as to be slidable in the front-rear direction, and protrudes radially outward from the locking groove. A lock piece having a locking protrusion formed by
A through hole formed through the thumb shaft, and a thumb seat bearing having a lock groove formed so that the locking protrusion can be fitted from the front side, and fixed to the thumb seat.
Engagement that includes a notch cut obliquely in the front-rear direction and a sliding protrusion that can be inserted into and removed from the notch, and that allows the button and the arm member to engage with each other inside the knob. And a section,
When the button is pushed in, the engaging portion moves the arm member forward while sliding the sliding protrusion from the open end of the notch toward the rear end, and at the same time, causes the locking protrusion to move. A crime prevention thumb turn characterized by being detached from the lock groove. The inner surface of the rear end of the locking groove is formed into a cam surface capable of pushing the locking protrusion forward when the thumb shaft is rotated in the unlocking direction.
The security thumb turn according to claim 1, wherein when the thumb shaft is rotated in a direction of unlocking, the cam surface pushes the locking protrusion forward and disengages it from the lock groove. The crime prevention according to claim 1 or 2, wherein the notch has the release end at an end surface of a thumb shaft of the button on the axial center side and is formed toward the knob surface. Sam Turn. The button is configured by a first button and a second button provided on each of a pair of the knob surfaces that are provided with the thumb shaft sandwiched in the knob. The security thumb turn according to any one of 3 above. The crime prevention 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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