JP2020139335A - Crime prevention thumb-turn - Google Patents

Abstract

To improve operability when a crime prevention thumb-turn is erroneously operated from an indoor side.SOLUTION: Included is an engaging element 44 which is supported so as to be engaged with a fixed cylinder 20 in the circumferential direction in the case of an illegal operation for applying an input torque to a knob 10 in a state in which a push button 13 is not pushed to a push position, and is arranged so as to be allowed to move to a release position where the push button is not engaged with the fixed cylinder 20 in the circumferential direction in the case of a normal operation. Rotation of the knob 10 and a thumb turn shaft 30 is prevented due to an engagement of the fixed cylinder 20 and the engaging element 44. The fixed cylinder 20 and the engaging element 44 are configured to convert an input torque applied to the knob 10 to apply a pushing force in a direction of disengaging the engaging element 44. When the push button 13 is pushed to the push position from the state in which the engagement is established against the input torque through the illegal operation, the engaging element 44 is moved to the release position by the push force.SELECTED DRAWING: Figure 1

Description

The present invention relates to a security thumb turn.

In general, a door that separates an indoor and an outdoor part of a house includes a box lock installed inside the door, a cylinder lock that is operated from the outdoor side with respect to the door, and a thumb turn that is operated from the indoor side with respect to the door. , The rotation operation of the key inserted into the key groove of the cylinder lock, the rotation operation of the thumb turn knob, or the electric motor so that the dead bolt of the box lock can be moved back and forth between the locking position and the unlocking position. It has become.

Conventionally, an illegal unlocking method called thumb-turn turning has been used as a method of invading a house. The thumb turn turning is performed by forming a through hole in the door with a drill, inserting a wire into the through hole, engaging a bent piece provided at the tip of the wire with the knob of the thumb turn, and pulling the wire. It is a method to unlock the box lock by rotating.

In order to prevent the thumb turn from turning, a crime prevention thumb turn configured to push the push button and then rotate the knob is used. The security thumb turn allows the knob and the rotation of the thumb turn shaft by the input torque when the normal operation that gives the input torque to the knob is performed while the push button arranged in the button window of the knob is pushed from the standby position to the predetermined push position. , When an illegal operation is performed to give an input torque to the knob without pushing the push button to the push position, the grip and the rotation of the thumb turn shaft are prevented by engaging the fixing cylinder and the engaging element. Generally, the thumb turn shaft is connected directly to the cylinder cam of the box lock or indirectly via the rotor of the electric motor.

For example, the security thumb turn of Patent Document 1 is centered on a rotatable thumb turn shaft that is inserted into a fixed cylinder and has one end connected to a cylinder cam and the other end is located outside the fixed cylinder, and the thumb turn shaft. A rotatable torque transmission cylinder, a knob connected to the torque transmission cylinder, a push button that is slidably inserted into the button insertion hole formed in the knob, and is connected to the thumb turn shaft by pushing, and a torque transmission cylinder. It is provided with a clutch for connecting the thumb turn shaft to the fixed cylinder and a regulating means for limiting the relative rotation amount of the thumb turn shaft and the torque transmission cylinder when the thumb turn shaft is relatively rotated. If the thumb turn knob is rotated without pushing the push button to a predetermined push position, the torque transmission cylinder rotates relative to the thumb turn shaft. The relative rotation causes the clutch to connect the thumb turn shaft and the fixed cylinder. Therefore, the thumb turn shaft is prevented from rotating, torque is not transmitted to the cylinder cam of the box lock, and the dead bolt is held at the locked position or the unlocked position. Further, when the torque transmission cylinder rotates relative to the thumb turn shaft by a predetermined angle, the regulating means is activated to prevent the torque transmission cylinder from rotating. On the other hand, when the push button is pushed to the push position to rotate the knob, the rotation is transmitted to the thumb turn shaft. At this time, since the thumb turn shaft and the torque transmission cylinder rotate together, the clutch is maintained in the disengaged state, and the cylinder cam is rotated by the thumb turn shaft. Therefore, the dead bolt is moved to the locking position or the unlocking position.

JP-A-2007-23761

However, the resident may operate the thumb turn in a hurry from the indoor side. At this time, an impatient resident may give an input torque to the knob from a state in which the push button is sufficiently pushed, and an illicit operation may be performed by mistake. Even in this case, in the crime prevention thumb turn of Patent Document 1, the torque transmission cylinder rotates with respect to the thumb turn shaft, and the clutch connects the thumb turn shaft and the fixed cylinder. In this connected state, the resident notices an erroneous operation because the picking cannot be turned. Here, even if the push button is pushed to the push position, the thumb turn shaft and the torque transmission shaft are only connected via the push button, and the connection between the fixed cylinder and the thumb turn shaft resisting the input torque is not released. .. For this reason, the resident is dissatisfied with the operability because the rotation of the knob is once returned to break the connection between the fixed cylinder and the thumb turn shaft.

In view of the above background, an object to be solved by the present invention is to improve the operability when the crime prevention thumb turn is erroneously operated from the indoor side.

In order to achieve the above-mentioned problems, the present invention provides the knob and the rotation of the thumb turn shaft with respect to the fixed cylinder when a normal operation of applying an input torque to the knob is performed while the push button is pushed from the standby position to a predetermined push position. If an illegal operation is performed to give an input torque to the knob while the push button is not pushed to the push position, the illegal operation is performed in the security thumb turn that prevents the knob and the thumb turn shaft from rotating with respect to the fixed cylinder. In the case of, it is supported in a state where it can be engaged with the fixed cylinder in the circumferential direction, and in the case of the normal operation, it is arranged so as to be allowed to move to a release position where it cannot be engaged with the fixed cylinder in the circumferential direction. The clamp is provided, and the engagement between the fixed cylinder and the engaging element prevents the knob and the rotation of the thumb turn shaft, and the fixed cylinder and the engaging element convert the input torque to prevent the rotation of the thumb turn shaft. The shape is such that a pushing force in the direction of disengaging is applied to the engaging element, and the push button is pushed to the push position from the state where the engagement is established against the input torque due to the illegal operation. When this is done, a configuration is adopted in which the engager is moved to the release position by the pushing force.

According to the above configuration, when an illegal operation is performed, when the fixed cylinder and the engaging element are engaged with the input torque given to the knob, a part of the input torque is converted at the engaging point, and the relevant A pushing force in the disengagement direction is applied to the engager. If the push button is pushed to the push position from this state, the engager is moved to the release position by the pushing force and cannot be engaged with the fixed cylinder. Therefore, it is not necessary to temporarily return the rotation of the knob in order to disengage the fixing cylinder and the engaging element. Therefore, the operability is improved when an illegal operation is mistakenly performed from the indoor side.

Specifically, a knob shaft serving as a rotation shaft for the knob and an elastic body for urging the push button toward the standby position are provided, and the push button is swingably supported by the grip shaft. , The swing leg portion is provided on the fixed cylinder side with respect to the swing center, and when the push button is in the standby position, the swing leg portion moves the engager to the release position. It is preferable that the swing leg portion is moved to a position outside the working space by being located in the working space required for the purpose and pushing the push button into the push position. In this way, the push button can be used to prevent the engager from moving to the release position, while the push button can be pushed to the push position to allow the engager to move to the release position.

More specifically, when the knob shaft is rotated by the input torque, the knob shaft and the thumb turn shaft are connected after the rotation amount of the grip shaft with respect to the thumb turn shaft reaches a predetermined amount, and the thumb turn shaft is connected. When the thumb turn shaft is rotated by the reverse input torque given to the knob shaft, a clutch for connecting the thumb turn shaft and the knob shaft is provided so as to keep the phase of the thumb turn shaft with respect to the knob shaft at a predetermined phase. Has an accommodating portion that holds the movable piece and the return spring and guides the movable piece in a linear direction, and a lock position in which the movable piece abuts against the swing leg portion in the linear direction and the lock position. It is arranged so as to be movable between the unlocked position retracted from the position, the return spring urges the movable piece toward the lock position, and the fixed cylinder is the case of the illicit operation. Has an engaging recess that engages with the engaging element, the thumb turn shaft has a pocket portion that holds the engaging element in the circumferential direction, and the pocket portion and the movable piece at the locked position are the predetermined. In the case of phase, a space is formed in which the engager can be accommodated in the release position, and when the knob shaft is rotated to the predetermined amount, the movable piece in the lock position causes the engager in the engagement recess. It is good to support it in the intruded state. In this way, in the case of normal operation, when the knob is rotated by a predetermined amount by the input torque, the movable piece is retracted to the unlocked position by the pushing force and the engaging element is accommodated in the unlocked position. It is possible to allow the connected knob and the rotation of the thumb turn shaft. Also, in the case of unauthorized operation, when the knob is rotated by a predetermined amount due to the input torque, the engaging element and the engaging recess are engaged with the movable piece restricted to the lock position to prevent the knob and the thumb turn shaft from rotating. If the push button is pushed to the push position, the knob and the rotation of the thumb turn shaft can be allowed. Further, when the thumb turn shaft is rotated by the reverse input torque, the thumb turn shaft and the knob connected by the clutch are kept in a predetermined phase, and the engager is released even when the movable piece is restricted to the lock position. Since it is housed in position, it can allow rotation of the thumb turn shaft and knob.

It is preferable that the swing leg portion swings in a direction orthogonal to the linear direction. In this way, the force for retracting the movable piece at the lock position to the unlock position does not act in the direction of swinging the swing leg. For this reason, it becomes easy to prevent the swing leg portion from moving due to the urging force of the elastic body, and it is possible to avoid heavy pushing of the push button.

The clutch has a transmission key provided on one of the knob shaft and the thumb turn shaft, and a key groove provided on the other side opposite to the one, and the key groove is located in an intermediate portion in the circumferential direction. It has an intermediate bottom surface portion whose depth is gradually shallowed from the position groove bottom toward both sides in the circumferential direction, and the transmission key has an intermediate recess for holding a connecting body and a clutch spring between the intermediate bottom surface portion. When the coupling body is urged by the clutch spring so as to maintain contact with the intermediate bottom surface portion and the knob shaft is rotated by the input torque, the clutch is rotated by the transmission key. When the knob shaft and the thumb turn shaft are connected by the engagement of the direction end portion and the key groove and the thumb turn shaft is rotated by the reverse input torque, the clutch engages with the connecting body and the intermediate bottom surface portion. It is preferable that the thumb turn shaft and the knob shaft are connected to each other. In this way, when the input rotation of the knob shaft is performed, the rotation load of the thumb turn shaft connected to the box lock side is large to cause the knob shaft to rotate with respect to the thumb turn shaft, and the amount of rotation is set to a predetermined amount. On the other hand, when the thumb turn shaft is rotated in the reverse direction, the rotation load of the knob shaft is small, and the resistance of the clutch spring is used to connect the connecting body and the intermediate bottom surface. The thumb-turn shaft and the knob shaft can be connected so as to cause engagement and keep the phase of the thumb-turn shaft with respect to the knob shaft in a predetermined phase.

As described above, according to the present invention, by adopting the above configuration, it is possible to improve the operability when the crime prevention thumb turn is erroneously operated from the indoor side.

(A) is a vertical sectional view showing a security thumb turn according to an embodiment of the present invention, and (b) is a sectional view taken along line I-I of the same (a). Perspective view showing the picking shaft and the picking plate of FIG. Front view showing the appearance of the security thumb turn of FIG. Perspective view showing the thumb turn axis of FIG. (A) is a vertical cross-sectional view showing a state in which the push button of FIG. 1 is pressed, and (b) is a cross-sectional view of lines III-III of the same (a). Cross-sectional view showing a state in which the security thumb turn of FIG. 1 is tampered with from the indoor side. Sectional drawing which shows the case where the push button is pushed from the state of FIG. Cross-sectional view showing the case where the picking shaft is rotated from the state of FIG.

Hereinafter, a security thumb turn according to an embodiment of the present invention will be described with reference to the accompanying drawings.

The security thumb turn shown in FIG. 1 includes a knob 10, a fixed cylinder 20 fixed to the door side, a thumb turn shaft 30 connected to the knob 10, and a clutch provided in a rotation transmission path between the thumb turn shaft 30 and the knob 10. And. The knob 10 and the thumb turn shaft 30 are rotatably arranged around the same axis with respect to the fixed cylinder 20. Hereinafter, the circumferential direction around the axis is referred to as a circumferential direction, the direction along the axis is referred to as an axial direction, and the direction orthogonal to the axis is referred to as a radial direction.

This security thumb turn corresponds to the state in which the door is locked (not shown) in the state shown in FIG. 1, and the door is unlocked by turning the knob 10 90 ° clockwise from this state. It is supposed to be.

The fixed cylinder 20 has a pedestal 21 fixed to the door side and a guide cylinder 22 fixed to the pedestal 21. The pedestal 21 and the guide cylinder 22 each have a tubular shape penetrating in the axial direction. The pedestal 21 is generally fixed to a lock case (not shown) of a box lock installed in the door or a casing (not shown) of an electric motor unit fixed to the lock case. The guide cylinder 22 is screwed to the pedestal 21 in a state of being concentrically fitted with the pedestal 21.

The knob 10 includes a knob shaft 11 that serves as a rotation axis of the knob 10 with respect to the fixed cylinder 20, a pair of grip plates 12 fixed to the grip shaft 11, and a pair of push buttons 13 swingably supported by the grip shaft 11. It has a swing shaft 14 which is a swing center of the pair of push buttons 13, and an elastic body 15 which urges the pair of push buttons 13. The entire knob 10 can rotate integrally with the fixed cylinder 20.

The thumb turn shaft 30 has a connecting shaft portion 31 inserted inside the pedestal 21 and a bottomed tubular flange portion 32 connected to one end side in the axial direction (right side in FIG. 1A) of the connecting shaft portion 31. .. The entire thumb turn shaft 30 can rotate integrally with the fixed cylinder 20. The thumb turn shaft 30 is connected to the cylinder cam (not shown) of the box lock or the rotor (not shown) of the electric motor unit at the connecting shaft portion 31.

As shown in FIGS. 1 and 2, the knob shaft 11 of the knob 10 is inserted inside the fixed cylinder 20 on the other end side in the axial direction (left side in FIG. 1A), and is inserted on the one end side in the axial direction (FIG. 1). In (a) middle right side), it protrudes to the outside of the fixed cylinder 20. The knob shaft 11 has a pair of legs 11a protruding toward one end in the axial direction. Holes 11b used for fixing the pair of knob plates 12 are formed in the pair of leg portions 11a. The seams of the pair of picking plates 12 fixed to the pair of legs 11a are covered by the picking covers 16 locked to the pair of picking plates 12.

Further, the pair of leg portions 11a are formed with shaft support holes 11c used for supporting the pair of push buttons 13. By inserting the swing shaft 14 into the shaft support hole 11c and the through hole formed in the pair of push buttons 13, the pair of push buttons 13 are placed between a predetermined standby position and the push position with respect to the knob shaft 11. Is supported so that it can swing.

As shown in FIGS. 1 to 3, the push button 13 has an operation portion 13a exposed from the button window 12a of the knob plate 12 and a swing leg portion 13b extending toward the fixed cylinder 20 with respect to the swing shaft 14. .. A space 11d for swinging the pair of swinging legs 13b is formed at the base of the picking shaft 11 connecting the pair of legs 11a.

An elastic body 15 is arranged between the operation portions 13a of the pair of push buttons 13. The elastic body 15 is made of a compression coil spring. The elastic body 15 urges a pair of push buttons 13 toward the standby position. The standby position is set at a position where the pair of operation portions 13a protrude from the pair of button windows 12a and the pair of swing leg portions 13b are closed to each other. The push position is set to a position where the pair of operating portions 13a are pushed to the maximum and the pair of swinging legs 13b are opened to the maximum.

As shown in FIGS. 1 and 4, the flange portion 32 of the thumb turn shaft 30 is arranged between the fixed cylinder 20 and the seat portion of the knob shaft 11. The flange portion 32 is guided in the radial direction by the guide cylinder 22. A pair of key grooves 32a are formed inside the annular wall of the flange portion 32 that faces the guide cylinder 22 in the radial direction. The keyway 32a extends axially with a depth in the radial direction. The key groove 32a has an intermediate bottom surface portion 32b whose depth is gradually reduced from the groove bottom located in the intermediate portion in the circumferential direction toward both sides in the circumferential direction. The groove bottom of the key groove 32a is the deepest part of the key groove 32a. The intermediate bottom surface portion 32b has a V-groove shape and is located at the center of the groove width in the circumferential direction of the key groove 32a. Both ends in the circumferential direction that define the groove width of the key groove 32a form a step in the radial direction. The space between both ends of the key groove 32a in the circumferential direction and the intermediate bottom surface portion 32b is a surface along the circumferential direction, and serves as a portion for guiding the picking shaft 11 in the radial direction.

As shown in FIGS. 1 and 2, a pair of transmission keys 11e are formed at the base of the knob shaft 11. The transmission key 11e extends axially with a height in the radial direction and is inserted into the key groove 32a. Both ends of the transmission key 11e in the circumferential direction form a step in the radial direction. The transmission key 11e has a middle recess 11f that holds the connecting body 40 and the clutch spring 41 between the transmission key 11e and the intermediate bottom surface portion 32b. The connecting body 40 is made of a spherical body. The middle recess 11f guides the connecting body 40 in the radial direction. The clutch spring 41 is composed of a coil spring that urges the connecting body 40 in the radial direction. The connecting body 40 is urged by a clutch spring 41 so as to maintain contact with the intermediate bottom surface portion 32b.

The clutch described above is composed of a pair of transmission keys 11e, a pair of key grooves 32a, a pair of connecting bodies 40, and a pair of clutch springs 41. When the picking shaft 11 is rotated by the input torque given to the picking plate 12, the connecting body 40 held in the inner recess 11f of the transmission key 11e is urged by the clutch spring 41 to form an intermediate bottom surface portion of the key groove 32a. It is in contact with 32b. At this time, since the rotational load (resistance from the box lock side) of the thumb turn shaft connected to the box lock side is large, the clutch spring 41 loses and the connecting body 40 slides in the circumferential direction with respect to the intermediate bottom surface portion 32b. .. When the input rotation amount of the knob shaft 11 reaches a predetermined amount, the circumferential end portion of the transmission key 11e engages with the circumferential end portion of the key groove 32a. By this engagement, the knob shaft 11 and the thumb turn shaft 30 are connected.

On the other hand, when the thumb turn shaft 30 is rotated by the reverse input torque, even if the connecting body 40 slides in the circumferential direction with respect to the intermediate bottom surface portion 32b, it is based on the depth change shape of the intermediate bottom surface portion 32b and the spherical shape of the connecting body 40. , The reverse input torque is converted into a force pushing into the middle recess 11f at the contact portion between the connecting body 40 and the intermediate bottom surface portion 32b. The urging force (resistance) of the clutch spring 41 increases by the amount that the connecting body 40 is pushed into the middle recess 11f. Further, the rotational load of the picking shaft 11 is small. From these facts, the connecting body 40 and the intermediate bottom surface portion 32b are engaged by the resistance of the clutch spring 41 before the reverse input rotation amount of the thumb turn shaft 30 with respect to the knob shaft 11 becomes equivalent to the above-mentioned predetermined amount. By this engagement, the thumb turn shaft 30 and the knob shaft 11 are connected. Since this engagement occurs when the driven rotation of the knob shaft 11 is hardly delayed with respect to the reverse input rotation of the thumb turn shaft 30, it is possible to keep the phase of the thumb turn shaft 30 with respect to the knob shaft 11 at a predetermined phase. When the phase of the knob shaft 11 and the thumb turn shaft 30 deviates from the neutral phase of FIG. 1A when the reverse input rotation of the thumb turn shaft 30 is stopped, the urging force of the clutch spring 41 is the intermediate bottom surface between the coupling body 40 and the coupling body 40. Since the contact portion of the portion 32b is converted into a force that slides the connecting body 40 with respect to the intermediate bottom surface portion 32b in a direction that eliminates the phase shift, the phases of the knob shaft 11 and the thumb turn shaft 30 are naturally returned to the neutral phase.

As shown in FIGS. 1 and 2, a pair of accommodating portions 11g are formed at a portion radially opposed to the guide cylinder 22 of the fixed cylinder 20 at the base of the knob shaft 11. The accommodating portion 11g holds the movable piece 42 and the return spring 43, and guides the movable piece 42 in the linear direction. The linear direction is the radial direction and is set in the direction along the swing shaft 14. The accommodating portion 11g communicates with the space 11d in the linear direction thereof. Further, the accommodating portion 11g is open toward the annular wall of the flange portion 32. The accommodating portion 11g has a stepped hole shape in which the hole diameter on the flange portion 32 side is increased and the hole diameter on the space 11d side is decreased.

As shown in FIG. 1, the movable piece 42 slides in a linear direction with respect to the inner peripheral surface of the small diameter hole of the accommodating portion 11g and the body portion slidable in the linear direction with respect to the inner peripheral surface of the large diameter hole of the accommodating portion 11g. It has a movable head. The return spring 43 is arranged between the head of the movable piece 42 and the stepped portion of the accommodating portion 11 g. The return spring 43 is made of a coil spring. When the knob shaft 11 rotates, the movable piece 42 and the return spring 43 are rotated by the accommodating portion 11g.

When the pair of push buttons 13 are in the standby position, the movable piece 42 is supported by the return spring 43 so as not to protrude from the accommodating portion 11g into the space 11d. At this time, the pair of swinging legs 13b are located in the space 11d at positions facing the rear ends of the body portions of the pair of movable pieces 42 in the linear direction. Here, when the pair of push buttons 13 are pushed in, the pair of swing legs 13b swing in a direction orthogonal to the linear direction. When the pair of push buttons 13 are pushed to the push position, as shown in FIG. 5, the pair of swinging legs 13b are moved to a position separated from the rear ends of the body portion of the pair of movable pieces 42. As a result, in the space 11d, an operating space required for retracting the pair of movable pieces 42 is generated. The working space is a region of the space 11d that faces the accommodating portion 11g in the linear direction. The movable piece 42 of FIG. 5 can be retracted into the working space so that its body is located between the pair of swinging legs 13b. That is, the movable piece 42 has a lock position that abuts in the linear direction with the swing leg portion 13b as shown in FIG. 1, and an operating space that is a part of the space 11d formed behind the movable piece 42 shown in FIG. It is arranged so that it can move in a straight line between it and the unlocked position that is retracted to. The return spring 43 urges the movable piece 42 toward the lock position.

The head of the movable piece 42 forms the top surface of the movable piece 42. The central portion of the top surface of the movable piece 42 has a concave shape, and the peripheral portion of the top surface from the concave edge to the outer peripheral edge of the top surface can move in the circumferential direction with respect to the flange portion 32 of the thumb turn shaft 30. It is a surface along the circumferential direction. The escape of the movable piece 42 with respect to the accommodating portion 11 g is prevented by the contact between the top peripheral portion thereof and the flange portion 32.

The movable piece 42 supports the engaging element 44 on its top surface. The engager 44 is made of a spherical body. As shown in FIGS. 1 and 4, the flange portion 32 has a pair of pocket portions 32c that hold the pair of engagers 44 in the circumferential direction. As shown in FIGS. 1 and 5, the pocket portion 32c and the movable piece 42 at the locked position form a space in which the engager 44 can be completely accommodated in the case of the predetermined phase described above. The radial length of the pocket portion 32c is shorter than the ball diameter of the engaging element 44. The engaging element 44 is always in a state of partially protruding from the pocket portion 32c toward the movable piece 42 side or the guide cylinder 22 side of the fixed cylinder 20.

The guide cylinder 22 has an engaging recess 22a that can engage with the engaging element 44 in the circumferential direction. The engaging recess 22a has a groove shape extending in the circumferential direction with a depth in the radial direction. Both ends of the engaging recess 22a in the circumferential direction have a shape that gradually becomes deeper toward the center side in the circumferential direction. When the circumferential end of the engaging recess 22a and the engaging element 44 engage in the circumferential direction, the torque is in the direction of disengaging the engagement based on the depth change shape of the engaging recess 22a and the spherical shape of the engaging member 44. It is converted into a pushing force (a force pushing the engaging element 44 in a direction to escape from the engaging recess 22a).

The knob 10, the fixed cylinder 20, the thumb turn shaft 30, the pair of movable pieces 42, the return spring 43, the engaging element 44, and the clutch are all provided with 180 ° rotational symmetry.

The operation of this crime prevention thumb turn will be described. Now, as shown in FIG. 1, consider a case where an illegal operation (illegal unlocking operation) of applying an input torque to the knob plate 12 of the knob 10 is performed while the pair of push buttons 13 are in the standby position (locking). In this case, the knob shaft 11, which is the rotation shaft of the knob 10, rotates with respect to the thumb turn shaft 30 in the circumferential direction corresponding to the input torque, as shown in FIG. After the amount of rotation reaches a predetermined amount, the clutch connects the knob shaft 11 and the thumb turn shaft 30. When there is an engaging element 44 protruding from the pocket portion 32c toward the movable piece 42 during this predetermined amount of rotation, the movable piece 42 causes the engaging element 44 to be the edge of the central portion of the top surface of the movable piece 42. It kicks out to the engaging recess 22a side in the vicinity, and supports the engaging element 44 in a state where it is inserted into the engaging recess 22a around the top surface of the movable piece 42. On the other hand, when the engaging element 44 does not protrude from the pocket portion 32c toward the movable piece 42, the peripheral portion of the top surface of the movable piece 42 slides inward of the engaging element 44, and the peripheral portion of the top surface thereof. It will be supported in a state where it is inserted into the engaging recess 22a. In this way, the pair of engaging elements 44 supported by the pair of movable pieces 42 engage with the pair of engaging recesses 22a in the circumferential direction, and the pushing force converted from the input torque at the engaging points is applied to the engaging elements 44. Given. Therefore, the engaging element 44 pushes the movable piece 42 backward, but since the movable piece 42 abuts in the linear direction with the pair of swinging legs 13b at the lock position, the lock position is opposed to the pushing force. Is maintained at. In the state where the engagement is established in this way, the pair of engaging recesses 22a of the fixed cylinder 20, the engaging element 44 held in the pocket portion 32c of the thumb turn shaft 30 in the circumferential direction, and the gripping shaft 11 in the circumferential direction. Since the pair of movable pieces 42 held by the knob and the pair of swinging legs 13b supported by the grip shaft 11 and urged by the elastic body 15 integrally resist the input torque, the grip shaft 11 and the thumb turn shaft The rotation of 30 is blocked. In this way, the engagement between the fixed cylinder 20 and the engaging element 44 prevents the knob 10 and the thumb turn shaft 30 from rotating.

By pushing the pair of push buttons 13 from the state shown in FIG. 6 to the push position shown in FIG. 5, as shown in FIG. 7, the pair of swinging legs 13b are moved from behind the body of the pair of movable pieces 42. It can be moved to an off position. As a result, the pair of movable pieces 42 are allowed to retreat to the unlocked position, and the pair of engaging elements 44 are allowed to move to the unlocked position. In this state, the above-mentioned pushing force is transmitted to the return spring 43 via the engaging element 44 and the movable piece 42, but the return spring 43 loses. Therefore, as shown in FIG. 8, the movable piece 42 is retracted to the unlocked position, the engager 44 is accommodated in the unlocked position, and cannot be engaged with the fixed cylinder 20 in the circumferential direction. As a result, the knob 10 and the thumb turn shaft 30 are allowed to rotate with respect to the fixed cylinder 20, and can be rotated up to 90 °.

Consider the case of an unauthorized operation in which the push button 13 is pushed from the standby position but is not pushed to the push position. Also in this case, since the pair of swinging legs 13b and the pair of movable pieces 42 can abut each other in the linear direction, the rotation of the knob shaft 11 and the thumb turn shaft 30 is prevented.

Consider a case where the knob 10 is started to be turned from the state where the push button 13 is pushed to the push position shown in FIG. In this case, a normal operation of applying the input torque to the picking plate 12 is performed in the state of FIG. 5 from the beginning of turning the knob 10. In this case, only the state of FIG. 5 is shifted to the order of FIGS. 7 and 8, and the knob 10 and the thumb turn shaft 30 are allowed to rotate 90 ° with respect to the fixed cylinder 20.

Consider a case where the thumb turn shaft 30 is rotated by the reverse input torque transmitted from the state of FIG. 1 to the connecting shaft portion 31 of the thumb turn shaft 30. In this case, the pair of movable pieces 42 are still restricted to the locked position by the pair of swinging legs 13b, but the clutch has a thumb turn so as to keep the phase of the thumb turn shaft 30 with respect to the knob shaft 11 in a predetermined phase. The shaft 30 and the knob shaft 11 are connected. In the case of the predetermined phase, as shown in FIG. 1, the pocket portion 32c and the movable piece 42 in the locked position form a space in which the engaging element 44 can be accommodated in the released position. Therefore, even if the movable piece 42 cannot be retracted, the engaging element 44 does not get caught between the engaging recess 22a and the movable piece 42 when the thumb turn shaft 30 and the knob shaft 11 are connected and rotated while being kept in a predetermined phase. .. Even if there is an engaging element 44 that has entered the engaging recess 22a, the engaging element 44 is taken around by the pocket portion 32c and slides on the circumferential end of the engaging recess 22a to naturally engage the engaging recess 22a. It just escapes from and is housed in the release position.

Further, in the unlocked state, the pair of engaging elements 44 are arranged vertically from the state shown in FIG. 8 (position rotated 90 ° clockwise with respect to the state shown in FIG. 1), and the engaging recess 22a of the guide cylinder 22 Facing the arcuate surface between them, the pair of movable pieces 42 remain in the retracted state of FIG. By turning the knob 90 ° counterclockwise from this state, the phase (locked state) of the knob 10 and the thumb turn shaft 30 in FIG. 1 is restored.

This crime prevention thumb turn is as described above, and when an unauthorized operation is performed, when the fixing cylinder 20 and the engaging element 44 are engaged with the input torque given to the knob 10, the input is performed at the engaging portion. A part of the torque is converted, and a pushing force in the direction of disengaging the engagement is given to the engaging element 44. If the push button 13 is pushed to the push position from this state, the engaging element 44 moves to the disengaging position by the pushing force. Since the fixed cylinder 20 cannot be engaged with the fixed cylinder 20, it is not necessary to temporarily return the rotation of the knob 10 in order to disengage the fixed cylinder 20 and the engaging element 44. Therefore, this crime prevention thumb turn can improve the operability when an unauthorized operation is mistakenly performed from the indoor side.

Further, this security thumb turn includes a knob shaft 11 that serves as a rotation shaft of the knob 10 and an elastic body 15 that biases the push button 13 toward the standby position, and the push button 13 is swingably supported by the grip shaft 11. The swing leg portion 13b is provided on the fixed cylinder 20 side with respect to the swing shaft 14 which is the swing center thereof, and when the push button 13 is in the standby position, the swing leg portion 13b engages the engaging element 44. It is located in the working space of the space 11d required to move to the release position, and when the push button 13 is pushed into the push position, the swing leg portion 13b can be moved to a position outside the working space, so the push button 13 is used. The movement of the engager 44 to the release position can be prevented, while the push button 13 can be pushed to the push position to allow the engager 44 to move to the release position.

Further, in the case of normal operation, this security thumb turn is formed by the movable piece 42 and the pocket portion 32c while the movable piece 42 is retracted to the unlocked position by a pushing force when the knob 10 is rotated by a predetermined amount by the input torque. Since the engaging element 44 is accommodated in the space at the release position, it is possible to allow 90 ° rotation of the knob 10 and the thumb turn shaft 30 connected by the clutch.

Further, in the case of an unauthorized operation, this security thumb turn ensures that the movable piece 42 restricted to the lock position rushes into the engaging recess 22a of the engaging element 44 when the knob 10 is rotated by a predetermined amount due to the input torque. The engagement of the fitting 44 and the engaging recess 22a can be realized, the rotation of the knob 10 and the thumb turn shaft 30 can be prevented, and if the push button 13 is pushed to the push position, the movable piece 42 and the engaging member 44 can be retracted. A 90 ° rotation of the knob 10 and the thumb turn shaft 30 can be allowed.

Further, in this crime prevention thumb turn, when the thumb turn shaft 30 is rotated by the reverse input torque, the thumb turn shaft 30 and the knob 10 connected by the clutch are kept in a predetermined phase, and the movable piece 42 is restricted to the lock position. Even if there is, the engaging element 44 is accommodated in the release position, so that the thumb turn shaft 30 and the knob 10 can be rotated by 90 °.

Further, in this security thumb turn, since the swing leg portion 13b swings in the direction orthogonal to the linear direction in which the movable piece 42 reciprocates, the movable piece 42 in the locked position is retracted to the unlocked position when a pushing force is applied. The force to cause the swing leg portion 13b does not act in the direction of swinging. Therefore, in this crime prevention thumb turn, the movement of the swing leg portion 13b due to the urging force of the elastic body 15 can be easily prevented, and the pushing operation of the push button 13 can be avoided from becoming heavy.

Further, this security thumb turn is transmitted to the intermediate bottom surface portion 32b of the key groove 32a by utilizing the fact that the rotation load of the thumb turn shaft 30 connected to the box lock side is large when the input rotation of the knob shaft 11 is performed. The connecting body 40 held in the inner recess 11f of the key 11e is slid to cause the knob shaft 11 to rotate with respect to the thumb turn shaft 30, and after the amount of rotation is set to a predetermined amount, the key groove 32a and the circumferential end of the transmission key 11e While the knob shaft 11 and the thumb turn shaft 30 can be connected by engaging with each other, the resistance of the clutch spring 41 makes use of the fact that the rotational load of the grip shaft 11 is small when the thumb turn shaft 30 rotates in the reverse direction. The thumb turn shaft 30 and the knob shaft 11 can be connected so as to cause the connecting body 40 and the intermediate bottom surface portion 32b to engage with each other and keep the phase of the thumb turn shaft 30 with respect to the knob shaft 11 in a predetermined phase. It should be noted that providing the protruding transmission key 11e on the picking shaft 11 is advantageous in increasing the amount of meat of the picking shaft 11 forming the accommodating portion 11g and the space 11d and ensuring the mechanical strength.

Further, in this crime prevention thumb turn, the engaging element 44 is made of a spherical body, and both ends of the engaging recess 22a in the circumferential direction gradually become deeper toward the center side in the circumferential direction, so that the input torque is converted into a pushing force. At the same time, the engaging element 44 can be smoothly escaped from the engaging recess 22a.

It should be noted that the embodiments disclosed this time are exemplary in all respects and are not restrictive. For example, the movable piece may be omitted so that the swing leg directly receives the engaging element. Therefore, the scope of the present invention is indicated by the scope of claims, and it is intended that all modifications within the meaning and scope equivalent to the scope of claims are included.

10 Picking 11 Picking shaft 11d Space 11e Transmission key 11g Accommodating part 11f Middle recess 13 Push button 13b Swing leg 14 Swing shaft 15 Elastic body 20 Fixed cylinder 22a Engagement recess 30 Thumb turn shaft 32a Key groove 32b Intermediate bottom surface 32c Pocket 40 Coupled body 41 Clutch spring 42 Movable piece 43 Return spring 44 Engagement element

Claims (5)

When a normal operation is performed to give an input torque to the knob while the push button is pushed from the standby position to a predetermined push position, the knob and the thumb turn shaft are allowed to rotate with respect to the fixed cylinder, and the push button is not pushed to the push position. In the security thumb turn that prevents the knob and the thumb turn shaft from rotating with respect to the fixed cylinder when an illegal operation that gives an input torque to the knob is performed in the state.
In the case of the illicit operation, it is supported in a state where it can be engaged with the fixed cylinder in the circumferential direction, and in the case of the normal operation, it is arranged so as to be allowed to move to a release position where it cannot be engaged with the fixed cylinder in the circumferential direction. Equipped with an engager
The engagement between the fixing cylinder and the engaging element prevents the knob and the thumb turn shaft from rotating.
The fixed cylinder and the engager have a shape that converts the input torque and applies a pushing force in the direction of disengaging the engager to the engager.
When the push button is pushed to the push position from the state where the engagement is established against the input torque due to the illicit operation, the engager is moved to the release position by the push force. Security thumb turn characterized by that. A knob shaft that serves as a rotation shaft for the knob, and an elastic body that urges the push button toward the standby position.
With
The push button is swingably supported by the knob shaft, and has a swing leg portion on the fixed cylinder side with respect to the swing center thereof.
When the push button is in the standby position, the swing leg is located in the working space required to move the engager to the release position, and the push button is pushed into the push position to cause the swing. The security thumb turn according to claim 1, wherein the moving leg is moved to a position outside the working space. When the knob shaft is rotated by the input torque, the knob shaft and the thumb turn shaft are connected after the rotation amount of the knob shaft with respect to the thumb turn shaft reaches a predetermined amount, and the reverse input given to the thumb turn shaft is applied. When the thumb turn shaft is rotated by torque, a clutch for connecting the thumb turn shaft and the knob shaft is provided so that the phase of the thumb turn shaft with respect to the knob shaft can be maintained at a predetermined phase.
The gripping shaft has a housing portion that holds the movable piece and the return spring and guides the movable piece in the linear direction, and a lock position where the movable piece abuts against the swing leg portion in the linear direction. It is movably arranged between the lock position and the unlocked position retracted, and the return spring urges the movable piece toward the lock position.
The fixed cylinder has an engaging recess that engages with the engaging element in the event of the illicit operation.
The thumb turn shaft has a pocket portion that holds the engager in the circumferential direction.
The pocket portion and the movable piece at the lock position form a space in which the engager can be accommodated at the release position in the case of the predetermined phase, and the lock is formed when the grip shaft is rotated to the predetermined amount. The security thumb turn according to claim 2, wherein the movable piece at the position supports the engaging element in a state of being inserted into the engaging recess. The security thumb turn according to claim 3, wherein the swing leg portion swings in a direction orthogonal to the linear direction. The clutch has a transmission key provided on one of the knob shaft and the thumb turn shaft, and a key groove provided on the other side opposite to the one.
The key groove has an intermediate bottom surface portion whose depth is gradually reduced from the groove bottom located in the intermediate portion in the circumferential direction toward both sides in the circumferential direction.
The transmission key has an intermediate recess for holding a connecting body and a clutch spring between the transmission key and the intermediate bottom surface portion, and is urged by the clutch spring so that the connecting body can maintain contact with the intermediate bottom surface portion. Has been
When the knob shaft is rotated by the input torque, the clutch connects the knob shaft and the thumb turn shaft by engagement of the circumferential end of the transmission key and the key groove, and the reverse input torque causes the clutch. The security thumb turn according to claim 3 or 4, wherein when the thumb turn shaft is rotated, the clutch connects the thumb turn shaft and the knob shaft by engaging the connecting body and the intermediate bottom surface portion.

Images