JP2008266930A - Back pressure coping mechanism of lock device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To smoothly unlock and lock without large load to a solenoid when back pressure is applied to a door or the like. <P>SOLUTION: This back pressure coping mechanism of a lock device includes: a lock member 3 engaged with a striker 3; a stopper part 4 engaged with the lock member; a link part 5 rotated in a body with the stopper part; a solenoid 7 for driving the link part; a first switch 31 for detecting the movement of the lock member 3; and a second switch 37 for detecting the movement of the stopper part 4, wherein when the striker and the lock member engage with each other, the first switch is operated, and when the lock member and the stopper part engage with each other, the second switch is operated. When unlock operation is performed by the solenoid, the first switch 31 is operated, in the case where the first switch 31 is operated and the second switch 37 is operated, abnormality is informed. When the lock operation is performed by the solenoid, the first switch 31 is operated, and the second switch 37 is not operated, abnormality is informed. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a back pressure countermeasure mechanism for a locking device that uses a detection switch to smoothly perform unlocking and unlocking against back pressure applied to a rocker door, a desk drawer, etc. when a large container is inserted. Is.

  FIG. 9 shows an embodiment of a conventional locking device (see Patent Document 1).

  This locking device 85 is applied to a rocker or the like, and includes a lock plate 87 that engages with a door striker 86, a first spring 88 that urges the lock plate 87 in the unlocking direction, and a rear step portion 87a of the lock plate 87. A stopper arm 89 that is in contact with the stopper arm 89, a drive lever 91 that is connected to the stopper arm 89 via a second spring 90, an electromagnetic solenoid 92 that drives the drive lever 91, and a pin 91a of the drive lever 91. A stopper release arm 92 that contacts the stopper arm 89 in the range and a strong third spring 93 that urges the stopper release arm 92 in the contact release direction of the stopper arm 89 are provided.

  For example, when a large baggage is placed in the rocker and the door is closed, the door is pushed outward to apply back pressure, the striker 86 is pulled outward, and the lock plate 87 is unlocked (counterclockwise). The plunger 92a is driven even when the solenoid 92 is actuated (protruded) by the password input operation of the numeric keypad so that the user attempts to unlock it by rotating slightly to the upper arm 89a of the stopper arm 89. If the lever 91 is only rotated counterclockwise, the stopper arm 89 does not come off the lock plate 87 and the lock is not released.

  When the user rattles the door and the striker 86 momentarily leaves the recess surface 87a of the lock plate 87, a gap is created between the step portion 89a of the stopper arm 89 and the step portion 87a of the lock plate 87, In the meantime, the third spring 93 rotates the stopper arm 89 in the unlocking direction, so that the lock is released.

In FIG. 9, reference numeral 94 is a switch for detecting the rotation of the lock plate 87, 95 is a switch for detecting the rotation of the stopper arm 89, 92b is a spring for protruding the plunger, 96 is a case housing each member, and 98 is Mounting brackets are shown respectively.
Japanese Patent Laying-Open No. 2005-240460 (FIG. 2)

  However, in the conventional locking device 85, it is assumed that the user rattles the door when the door does not open due to back pressure. If the door is not opened, the door will not open. In addition, there is a concern that the user may be inconvenienced. In addition, even if the user puts luggage in the locker, closes the door, and tries to lock the door with back pressure applied, the striker 87 is displaced more in the door opening direction than usual and interferes with the lock plate 87. There was a concern that locking would not be performed smoothly.

  In addition, since the materials of the lock plate 87, the stopper arm 89, and the striker 86 are appropriately selected from metal or synthetic resin, the mutual frictional force is not constant and the back pressure applied to the door is not constant. In order to smoothly perform locking and unlocking, the solenoid 92 is set to be large and strong, and there is a concern that the structure is enlarged and the cost is increased. Further, if the drive of the solenoid 92 fails in the state where the back pressure is applied, the solenoid 92 is continuously energized, and there is a concern that the solenoid 92 may be damaged.

  In view of the above points, the present invention addresses the back pressure of a locking device that can smoothly perform locking and / or unlocking without applying a heavy load to the solenoid when back pressure is applied to a door or the like. The purpose is to provide a mechanism.

  To achieve the above object, a back pressure countermeasure mechanism of a locking device 1 according to claim 1 of the present invention includes a lock member that engages with a striker on the other side, a stopper portion that engages with the lock member, A link portion that rotates integrally with the stopper portion; a solenoid that drives the link portion; a first switch that detects the movement of the locking member; and a second switch that detects the movement of the stopper portion. The first switch is activated when the striker is engaged with the lock member, and the second switch is activated when the lock member is engaged with the stopper portion. Sometimes, when the first switch is operated and the second switch is operated, an abnormality is notified.

  With the above configuration, when the user unlocks the door when back pressure is applied, the lock member is pulled by the striker in the door opening direction and rotated in the unlocking direction to engage the lock member. The stopper part and the lock member abut against each other with a strong frictional force. Even if the stopper part tries to rotate in the unlocking direction by the solenoid, the engagement with the lock member is not released and it cannot be unlocked. Regardless of whether the first switch and the second switch remain on (or off), the control unit receives these signals and informs the user that the lamp or buzzer cannot be unlocked. For example, the user unlocks the back pressure by releasing the back pressure by closing the locker or the like in the closing direction while looking at the cautionary note on the door.

  The back pressure handling mechanism of the locking device 1 according to claim 2 is the back pressure handling mechanism of the locking device according to claim 1, wherein the first switch is activated during the locking operation by the solenoid, and the second An abnormality is notified when the switch does not operate.

  With the above configuration, when the user is locking, if the back pressure is applied to the door, the lock member is pulled in the door opening direction by the striker and rotated in the unlocking direction, and the stopper part is locked by the solenoid. The locking member interferes with the locking member when it is rotated, but the locking member turns on (or off) the first switch, and the stopper turns off (or on) the second switch. The user is informed that it cannot be locked with a buzzer or buzzer. The user, for example, looks at the warning on the door and pushes the baggage strongly into a storage room such as a rocker to release the back pressure, and then locks.

  According to the first aspect of the present invention, for example, even when the user puts a large load in the rocker and back pressure is applied to the door and the door is not unlocked, the abnormality is notified to the user, and the user By releasing the back pressure by pushing the door, unlocking is performed smoothly. In this way, by directly informing the user of the abnormality and promptly unlocking it, it is possible to avoid energizing the solenoid for a long time, prevent the solenoid from being damaged, and improve durability. Further, by performing unlocking in a state where the back pressure is completely released, sliding friction between the lock member and the stopper portion is eliminated, and the locking device can be miniaturized using a small solenoid.

  According to the second aspect of the present invention, for example, even when a user puts a large load in the rocker and back pressure is applied to the door and the door is not locked, the abnormality is notified to the user, and the user By pressing to release the back pressure, locking is performed smoothly. Thus, by notifying the user directly of the abnormality and promptly locking it, it is possible to avoid energizing the solenoid for a long time, prevent the solenoid from being damaged, and improve durability. Further, by performing locking in a state in which the back pressure is completely released, sliding friction between the lock member and the stopper portion is eliminated, and the locking device can be miniaturized using a small solenoid.

  1 to 4 show an embodiment of a back pressure countermeasure mechanism of a locking device according to the present invention. This lock device (electric lock) 1 is miniaturized and is suitable for drawing out a rocker or a desk.

  As shown in FIG. 1, the lock device 1 includes a rotatable lock plate (lock member) 3 that engages with a striker 2 such as a door or a drawer (hereinafter referred to as a door), a stopper portion 4 and a link portion for the lock plate 3. 5, a rotatable plate member (member) 6, a horizontal electromagnetic solenoid 7 in which the plunger 8 is engaged with the upper portion of the link portion 5, and a first end contacting and separating from the rear end portion of the lock plate 3. A switch 31, a second switch 37 that contacts and separates from the rear end portion of the stopper portion 4, and an LED lamp 44 that blinks by the operation of the switches 31 and 37 are provided.

  In the embodiment of FIG. 1, an example is shown in which the stopper portion 4 and the link portion 5 are configured by separate stopper plates (or stopper levers) (4) and link plates (or link levers) (5). It is also possible to integrally form the stopper portion 4 and the link portion 5 with a metal plate.

  If a separate stopper plate (4) is used, it can be locked (locked) even when the door is opened (the striker 2 is spaced apart from the lock plate 3) in response to auto-locking. 1, for example, the solenoid 7 is turned on to cause the plunger 8 to protrude forward by the force of the compression coil spring 46, and the link plate (5) is rotated counterclockwise together with the plunger 8. At this time, the stopper plate (4) rotates counterclockwise by the urging force of the torsion spring 30 and comes into contact with the arc-shaped convex portion 38 on the rear side of the lock plate 3 to obtain a lock ready state. The arc surface 38 a of the convex portion 38 is drawn with a radius centered on the shaft portion 13.

  The striker 2 on the other side is bent and formed in a substantially U shape, and can move forward and backward in the recess 12 of the case 11 of the electric lock 1. In FIG. 1, the door is slightly opened. The lock plate 3 is supported by the case 11 so as to be pivotable in the vertical direction at the shaft portion 13 and is urged in the locking and unlocking directions by a snap spring 14 (FIG. 3), and the unlocked state is maintained in FIG. Yes.

  The lock plate 3 includes an upward short convex portion 15, a long convex portion 16, a concave portion 17 between both convex portions 15, 16, and a concave portion (engaged portion) 18 on the rear side of the long convex portion 16. And an arcuate convex portion 38 on the rear side of the concave portion. In FIG. 1, the striker 2 hits the long convex portion 16, and when the door of FIG. 3 is closed, the lock plate 3 is rotated clockwise (locking direction) by the urging force of the spring 14 to hold the striker 2 with the short convex portion 15. 4, the protruding portion 19 (engagement portion) at the tip of the stopper portion 4 engages with the rear concave portion 18 with a gap 64 between the rear convex portion 38 of the lock plate 3 during locking. . Since the clearance 64 is present, the load on the solenoid 7 is small and can be locked and unlocked with a small force, and the solenoid 7 can be downsized.

  5, the rear end portion 39 of the lock plate 3 has a large-diameter arc (curved) rear end surface 39a, and the rear end surface 39a passes through the upper (corner portion) small-diameter curved surface 39b to project the convex portion 38. And a flat surface 39c that is substantially orthogonal to the lower side of the rear end surface 39a.

  A first switch 31 is disposed adjacent to the rear of the lock plate 3, and the substantially curved contact 31 a of the first switch 31 is in contact with the rear end surface 39 a of the lock plate 3. 31a is pushed rearward and the switch 31 is turned on (or off).

  When the switch 31 is off (or on), the contact 31a protrudes forward as shown by a chain line in FIG. 5 by the force of the spring in the case portion 31b. The chain-line contact 31a is the one at the time of unlocking in FIG. 1, and the rear end surface 39a of the lock plate 3 that has fallen horizontally in FIG. 1 is located slightly above the front side of the contact 31a. On (or off) means that depending on the type of the switch 31, the normally open contact is turned on, and the normally closed contact is turned off.

  The case 31b of the switch 31 is fixed to the case 11 substantially perpendicularly (inclined slightly later), the contact 31a projects obliquely downward from the upper front end of the case 31b, and a pair of terminals 31c from the rear end of the case 31b. The lead wire (not shown) is connected to the terminal 31c, and the lead wire is connected to the control unit 43 via the I / O port 42 of FIG.

  As shown in FIG. 1, the plate member 6 is composed of a link portion 5 in the vertical (vertical) direction and a stopper portion 4 obliquely intersecting the link portion 5, and an upper projecting portion 20 and a lower projecting portion 21 of the link portion 5. In addition, a long hole-like cutout hole (guide portion) 22 in the vertical direction is provided.

  A cylindrical horizontal pin portion (engagement portion) 24 is provided orthogonal to the front portion of the plunger 8 of the solenoid 7, and the pin portion 24 is slidably engaged with the upper cutout hole 22. The pin portion 24 protrudes from the axis of the plunger 8 at a right angle. An impact canceling counter weight pin (not shown) is slidably engaged with the lower notch 22. In this example, the vertical distance from the center of the shaft portion 10 to the center of each of the upper and lower pin portions 24 is set equal.

  The stopper portion 4 protrudes obliquely forward upward from the link portion 5, protrudes downward from the front portion 26 and is bent in the orthogonal direction, and protrudes obliquely rearward downward from the link portion 5. And a rear portion 27. When the stopper portion 4 is formed separately from the link portion 5, a plate-like portion 28 that protrudes upward and horizontally from the rear portion 27 is provided on the stopper portion (stopper plate) 4, and the plate-like portion 28 is provided from above. A rearward projecting portion 29 to be contacted is provided on the link portion (link plate) 5. The stopper portion 4 is urged counterclockwise by the torsion spring 30, and the link portion 5 is also urged integrally. One end 30 a of the torsion spring 30 is locked to the link portion (link plate) 5, and the other end 30 b is locked to the plate-like portion 28 on the rear end side of the portion (stopper plate) 4. It is weaker than the force of the compression coil spring 46 on the 7 side. The plate-like portion 28 protrudes outside the case 11 and can be externally operated.

  In this example, the center of gravity of the separate stopper plate (4) coincides with the center of the shaft portion 10, the center of gravity of the link plate (5) coincides with the center of the shaft portion 10, and links with the stopper plate (4). The moments about the spindle of the plate (5) are the same. Further, the center of gravity of the plate member 6 integrated with the stopper portion 4 and the link portion 5 coincides with the center of the shaft portion 10, and the moments around the support shaft of the stopper portion 4 and the link portion 5 are the same.

  The protrusion (rear part) 27 on the rear side of the stopper part 4 has a large-diameter arc (curved) rear end surface 27a, and a second switch 37 is disposed behind the protrusion 27, and the second switch 37 contactors 37a can contact the rear end surface 27a. The rear end surface 27a continues to the upper protrusion 28 via the upper corner.

  The case portion 37b of the second switch 37 is fixed vertically to the case 11, the contact 37a protrudes obliquely upward from the lower front end of the case portion 37b, and a pair of terminals 37c project from the rear end of the case portion 37b. A lead wire (not shown) is connected to the terminal 37c, and the lead wire is connected to the control unit 43 via the I / O port 42 of FIG.

  The rear end surface 27a of the stopper portion 4 is located slightly forward and downward from the contact 37a of the second switch 37 when unlocked in FIG. 1, and is pressed against the contact 37a when locked in FIG. 4 (FIG. 5). The second switch 37 is turned on (or turned off) by touching the contact 37a backward.

  In the example of FIG. 1, the electromagnetic solenoid 7 is small and light, but the plunger 8 is reliably protruded using the compression coil spring 46 for returning the plunger. The cylindrical body portion 32 of the solenoid 7 is fixed horizontally to the case 11, and the plunger 8 moves back and forth horizontally.

  FIG. 6 shows a simplified circuit configuration of the lock device 1. The solenoid 5, the first switch 31, the second switch 37, and the LED lamp 44 are respectively connected to the control unit via the I / O port 42. (CPU) 43 and a timer 45 is further connected to the controller 43. The I / O port 42, the control unit 43, and the timer 45 are arranged outside the lock device 1.

  Below, the effect | action at the time of locking of the locking device 1 is demonstrated using the structure of FIGS. 1-5, and the flowchart of FIG.

  At the time of unlocking in FIG. 1, both the first and second switches are turned off. The solenoid 7 is not yet operated, and the tip 19 of the stopper portion 4 is spaced above the lock plate 3. The user puts the load in the rocker, closes the door, and performs a locking operation with the key (see reference numeral 51 in FIG. 7). The key may be an insertion rotation type, a numeric keypad for password input, or an IC card.

  As soon as the door is closed as shown in FIG. 3, the striker 2 engages the recess 17 of the lock plate 3 while rotating the lock plate 3 clockwise around the shaft portion 13. The rear end surface 39a of the lock plate 3 rotates downward to push the contact 31a of the first switch 31 to turn on the first switch 31 (see reference numeral 52 in FIG. 7). The first switch 31 determines whether or not the lock plate 3 has been rotated.

  By the operation of the key and the first switch 37 being turned on, the solenoid 43 is energized as shown in FIG. 4 by the action of the control unit 43 (FIG. 6), and the plunger 8 moves forward (protrusions) by the force of the spring 46. (See reference numeral 53 in FIG. 7), the plate member 6 is rotated counterclockwise (see reference numeral 54 in FIG. 7), and the protrusion 19 at the tip of the stopper portion 4 enters the recess 18 in the lock plate 3. In combination, the convex portion 38 on the rear side of the concave portion 18 abuts against the protruding portion 19, thereby preventing the lock plate 3 from rotating in the unlocking direction (counterclockwise). The rear lower surface 39 c of the lock plate 3 abuts on the inclined surface 40 of the case 11. The stopper portion 4 is elastically biased counterclockwise (lock direction) by a spring 30. Even when the energization of the solenoid 7 is released, the locked state is maintained by the urging force of the spring 46 and the spring 30.

  When the stopper portion 4 is a separate stopper plate (4) from the link portion 5, the link plate (5) and the stopper plate (in FIG. 3) are rotated as the link plate (5) rotates counterclockwise. 4) is maintained by the force of the spring 30, and the stopper plate (4) is rotated counterclockwise (locking direction) by the force of the spring 30 as shown in FIG. Thus, the protrusion 19 at the tip engages with the lock plate 3 (see reference numeral 54 in FIG. 7).

  The rear end surface 27a of the stopper 4 pushes the contact 37a of the second switch 37 to turn on the second switch 37 (see reference numeral 55 in FIG. 7). Thereby, it is detected that locking is completed (see reference numeral 56 in FIG. 7).

  When back pressure is applied to the door in FIG. 4, the lock plate 3 is pulled in the door opening direction (outward) by the striker 2 and slightly turns counterclockwise, and the rear protrusion 38 is displaced forward. Therefore, the protruding portion 19 at the tip of the stopper portion 4 interferes with the convex portion 38 of the lock plate 3 and cannot enter the concave portion 18 and is not locked. When the stopper portion 4 and the link portion 5 are integrated, the plunger 8 does not fully extend and stops halfway. When the stopper part 4 and the link part 5 are separate bodies, the plunger 8 is fully extended and the link part 5 rotates completely, but the stopper part 4 comes into contact with the convex part 38 during the rotation and stops. .

  When the second switch 37 is OFF at the reference numeral 55 in FIG. 7, after the timer 45 (see FIG. 6) has elapsed for a certain time (see the reference numeral 57 in FIG. 7), the LED lamp 44, the buzzer, etc. (not shown) To notify the user that the lock is not applied (see reference numeral 58 in FIG. 7). The control unit 43 (FIG. 6) that has received the OFF signal of the second switch 37 operates the LED lamp 44 and the like. At the door of the rocker, a notice is given to push the baggage again when there is a notification such as blinking of the lamp 44.

  By this appeal, when the user pushes the door in the closing direction (in the case of a desk, pushes the drawer in the closing direction) (see reference numeral 59 in FIG. 7), the back pressure is released, and the lock plate 3 is shown in FIG. At the same time, the protrusion 19 of the stopper 4 is engaged with the recess 18, and at the same time, the rear end surface 27a of the stopper 4 pushes the contact 37a of the second switch 37 to turn it on (see FIG. 7) (see reference numeral 60 in FIG. 7). At the same time as locking, the control unit 43 (FIG. 6) acts to eliminate the notification of the lamp 44 and the like.

  As long as a predetermined time has not elapsed at reference numeral 57 in FIG. Further, when the second switch 37 is OFF at the reference numeral 60 in FIG. 7, after the timer 45 (FIG. 6) has passed for a certain time (see the reference numeral 61), the solenoid 7 is energized to attract the plunger 8 ( (See reference numeral 62), and remains unlocked (unlocked) (see reference numeral 63). If the lock is not completed, for example, the key cannot be removed, so the user can detect the abnormality without leaving. As long as a predetermined time has not elapsed at reference numeral 61 in FIG.

  Below, the effect | action at the time of unlocking of the locking device 1 is demonstrated using the structure of FIGS. 1-5, and the flowchart of FIG.

  When the user performs an unlocking operation with the key from the locked state of FIG. 4 (see reference numeral 71 in FIG. 8), the solenoid 7 is energized and the plunger 8 is sucked (see reference numeral 72 in FIG. 8) as shown in FIG. Accordingly, the link portion 5 and the stopper portion 4 are integrally rotated in the unlocking direction (clockwise) (see reference numeral 73 in FIG. 8). When the link part 5 and the stopper part 4 are separate bodies, the protrusion part 28 of the stopper part 4 is pushed clockwise by the protrusion part 29 of the link part and rotates (see reference numeral 73 in FIG. 8). By the rotation, the protruding portion 19 at the tip of the stopper portion 4 is detached upward from the concave portion 18 of the lock plate 3.

  When the stopper portion 4 is rotated clockwise, the rear end surface 27a of the stopper portion 4 is separated downward from the contact 37a of the second switch 37, and the second switch 37 is turned off (FIG. 8). Reference numeral 74). The first switch 31 remains pressed in both FIGS. 4 and 3 when the contact 31a is pushed by the rear end surface 39a of the lock plate 3. FIG. In this state, unlocking (unlocking) is completed (see reference numeral 75 in FIG. 8).

  As shown in FIG. 1, when the user opens the door, the striker 2 rotates the lock plate 3 counterclockwise against the force of the snap spring 14, and the rear end surface 39a of the lock plate 3 is the first switch. The first switch 31 is turned off, and both the switches 31 and 37 are turned off.

  When back pressure is applied to the door in the locked state shown in FIG. 4, the lock plate 3 is pulled in the door opening direction (outward) by the striker 2 and slightly rotated counterclockwise. The inner surface (front end surface) 38b of the convex portion 38 strongly contacts the inner surface (rear end surface) 19a of the protrusion 19 at the tip of the stopper plate 3 without any gap, and the stopper portion 4 does not rotate even when the solenoid 7 is excited in the plunger suction direction. The protrusion 19 remains engaged with the recess 18 of the lock plate 3 without moving, and the lock is not released. The same applies to the case where the stopper portion 4 and the link portion 5 are separate bodies.

  In these cases, the rear end surface 27a of the stopper portion 4 pushes the contact 37a of the second switch 37 to turn on the second switch 37 (see reference numeral 74 in FIG. 8), and the timer 45 (FIG. 5) is set for a predetermined time. After the passage (see reference numeral 76 in FIG. 8), the user is notified of the abnormality by the LED lamp 44, a buzzer, or the like (see reference numeral 77 in FIG. 8).

  When the user sees the cautionary note on the door (the cautionary note that the user wants to push the door when the lamp is on) and pushes the door in the closing direction (see reference numeral 78 in FIG. 8), the lock plate 3 by the striker 2 The tension is released, and the lock plate 3 is returned to the normal position clockwise by the force of the snap spring 14 as shown in FIG. 3, and the contact between the convex portion 38 and the protruding portion 19 of the stopper portion 4 is released. 4 rotates against the urging force of the spring 46 in the clockwise direction integrally with the link portion 5 by the pulling force of the plunger 8, and the engagement between the protruding portion 19 and the recessed portion 18 is released.

  At the same time, the rear end surface 27a of the stopper portion 4 is separated downward and forward from the contact 37a of the second switch 37 and the second switch 37 is turned off (see reference numeral 79 in FIG. 8), and unlocking is completed ( (See reference numeral 75 in FIG. 8).

  When shifting from FIG. 4 to FIG. 3, if the back pressure of the door is not eliminated and the stopper portion 4 does not rotate clockwise, the second switch 37 remains on (reference numeral in FIG. 8). 79), after the timer 45 (FIG. 6) has elapsed (see reference numeral 80), the solenoid 7 is energized to protrude (open) the plunger 8 (see reference numeral 81), and the unlocking is not completed yet. (See reference numeral 82). Before a predetermined time elapses of the timer 45 indicated by reference numeral 80 in FIG.

  The above-described configuration is effective not only as a back pressure countermeasure mechanism of the lock device but also as the lock device itself or as a back pressure countermeasure method of the lock device.

It is a front view at the time of unlocking which shows one Embodiment of the back pressure countermeasure mechanism of the locking device which concerns on this invention. It is a front view which shows the lock preparation state which similarly opened the door of the back pressure countermeasure mechanism of a locking device. It is a front view which shows the state before the unlocking which similarly closed the door of the back pressure countermeasure mechanism of the locking device. It is a front view which shows the state at the time of locking of the back pressure countermeasure mechanism of a locking device similarly. It is a front view of the state which omitted a part of figure at the time of locking of Drawing 4, and showed the inside. It is a circuit diagram which shows the outline | summary of the electrical connection of the back pressure countermeasure mechanism of a locking device. It is a flowchart which shows the flow of the locking operation | work of the back pressure countermeasure mechanism of a locking device. It is a flowchart which shows the flow of the unlocking operation | work of the back pressure countermeasure mechanism of a locking device. It is a front view which shows one form of the conventional locking device.

Explanation of symbols

1 Locking device 2 Striker 3 Lock plate (locking member)
4 Stopper 5 Link 7 Solenoid 31 First Switch 37 Second Switch

Claims (2)

  A lock member that engages with the striker on the other side, a stopper portion that engages with the lock member, a link portion that rotates integrally with the stopper portion, a solenoid that drives the link portion, and a movement of the lock member A first switch for detecting the movement of the stopper portion, and the first switch is activated when the striker is engaged with the lock member. The second switch is activated when engaged with the stopper, the abnormality is reported when the first switch is activated and the second switch is activated during the unlocking operation by the solenoid. A back pressure countermeasure mechanism for a locking device.   2. The back pressure countermeasure mechanism for a locking device according to claim 1, wherein an abnormality is notified when the first switch is activated and the second switch is not activated during the locking operation by the solenoid.

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