JP2007255136A - Electric lock - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To accurately detect a projection state of a dead bolt to a locking hole of a strike arranged in a door frame. <P>SOLUTION: This electric lock 1 locks and unlocks a lock by advancing and retreating the dead bolt 2a to the locking hole 7a of the strike 7 arranged in the door frame, and has a locking-unlocking position detecting means 3. The locking-unlocking position detecting means 3 has a sensor part 11 and a driving part 12. The sensor part 11 has a coil 11a fixed to a predetermined position in a lock box 6 and a core 11b interlocking with the dead bolt 2a by facing a part in a winding part of the coil 11a. The driving part 12 detects a displacement quantity of the dead bolt 2a from a change in impedance of the coil 11a caused by the movement of the core 11b in a hole in the winding part of the coil 11a interlocking with the dead bolt 2a in locking and unlocking. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an electric lock that electrically locks and unlocks a lock by moving a locking member such as a dead bolt or a hook lock forward and backward with respect to a locking hole of a strike provided in a door frame.

  For example, electric lock systems are widely used at entrances and exits of commercial facilities and public facilities such as hotels and office buildings, entrances and entrances of housing complexes and ordinary houses. In this electric lock system, a card-like storage medium storing various data such as specific encryption and locking / unlocking information allocated in advance for each electric lock is used as a key card, and various data stored in this key card. (For example, locking / unlocking data with a specific encryption) is read, the read data is collated with pre-registered information to determine the legitimacy, and only when it is successfully authenticated, the current door open / close state and unlocking The lock is electrically locked and unlocked according to the lock state.

  Various types of electric locks, including the following Patent Document 1, have been proposed as electric locks employed in this type of electric lock system. An example will be described. For example, a gear transmission mechanism that rotates in a locking direction and an unlocking direction by a driving force of a driving source such as a motor, and the like, and is operated by a transmission force of the gear transmission mechanism. The electric lock is configured by providing the lock box with a dead cam that rotates and a dead bolt that moves forward and backward through the operating arm of the dead cam. In this electric lock, at the time of locking or unlocking operation, the driving source is driven according to the current open / close state of the door or the unlocking state of the lock, and the gear transmission mechanism is locked or unlocked by the driving force of this driving source. The dead bolt is moved forward and backward with respect to the strike hole of the strike provided in the door frame via the dead cam operating arm by the transmission force of the gear transmission mechanism, and the dead bolt is locked to the lock hole. Alternatively, the lock is unlocked by releasing it from the locking hole.

By the way, in this type of conventional electric lock, a locking sensor that detects the locking position where the dead bolt has fully protruded and an unlocking sensor that detects the unlocking position where the dead bolt has been fully drawn are detected by a detector such as a microswitch. The present locking / unlocking sensor detects the current locking / unlocking state.
JP-A-2005-232893

  However, in a conventional electric lock using a detector such as the above-described microswitch, it is unclear at which position the dead bolt is located at a position where both the locking sensor and the unlocking sensor are OFF. In other words, it is unclear whether the dead bolt is positioned just before locking, the position just before unlocking, or even between unlocking and locking, with respect to the strike hole of the strike, The position of the dead bolt (protrusion situation) could not be detected accurately.

  Therefore, the present invention has been made in view of the above problems, and accurately detects the position (protrusion state) of the locking member (dead bolt or hook lock) with respect to the locking hole of the strike provided in the door frame. It is an object to provide an electric lock that can be used.

In order to achieve the above object, an electric lock according to claim 1 is an electric lock that locks and unlocks the lock by moving the locking member forward and backward with respect to the locking hole of the strike provided in the door frame. In
A coil that is fixed at a predetermined position in the lock box, and a metal body that partially engages with the winding member of the coil and interlocks with the locking member, and that interlocks with the locking member during locking and unlocking. A locking / unlocking position detecting means for detecting a displacement amount of the locking member from a change in impedance of the coil accompanying the movement of the metal body in a coil winding portion is provided.

The electric lock according to claim 2 is the electric lock according to claim 1,
At the time of energizing or unlocking, the movement amount of the locking member is controlled according to the current locking / unlocking state based on the detection signal from the locking / unlocking position detecting means.

  According to the electric lock of the present invention, at the time of locking / unlocking control, it is possible to accurately detect the position (protrusion state) of a locking member such as a dead bolt or a hook lock with respect to a locking hole of a strike provided in the door frame. . And at the time of locking energization or unlocking energization, the deadbolt operation status (protrusion status) is always recognized, and the forward and backward movement of the deadbolt is controlled according to the current locking / unlocking status. Alternatively, it can move to the unlocking position and perform a reliable unlocking operation.

  The best mode of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a block diagram showing a main part of an electric lock according to the present invention, and FIGS. 2A and 2B are schematic configuration diagrams showing a locked state and an unlocked state of the electric lock according to the present invention.

  As shown in FIG. 1, the electric lock 1 of this example is schematically configured by including a locking / unlocking mechanism 2, a locking / unlocking position detecting means 3, a control means 4, and a driving means 5 in a lock box 6 shown in FIG. . In this electric lock 1, when the door is unlocked, the driving means 5 is driven based on a command (locking command or unlocking command) from the control means 4 according to the current door opening / closing state or locking / unlocking state. The dead bolt 2a, which is a locking member of the locking / unlocking mechanism 2, is moved forward and backward by linear displacement with respect to the locking hole 7a provided in 7, and the dead bolt 2a protrudes (when locked) into the locking hole 7a. The lock is electrically unlocked by pulling in (when unlocked).

  The locking / unlocking mechanism 2 includes a dead bolt 2a as a locking member that is locked to or released from the locking hole 7a by advancing and retreating of the linear displacement with respect to the locking hole 7a of the strike 7. Is provided with a conventionally known power transmission mechanism 2b such as a gear transmission mechanism for transmitting the driving force to the dead bolt 2a, and a dead cam.

  As shown in FIG. 1, the locking / unlocking position detection unit 3 includes a sensor unit 11 and a drive unit 12. The sensor unit 11 includes a coil 11a composed of a winding portion fixed at a predetermined position in the lock box 6, and a core 11b partially facing the winding portion of the coil 11a and interlocking with the dead bolt 2a. Yes. The core 11b is made of a rod-shaped metal body, one end is connected to the base end side of the dead bolt 2a, and a part of the other end is provided by being inserted substantially at the center of the hole of the winding portion of the coil 11a. The sensor unit 11 is configured such that the other end side of the core 11b moves in parallel with the dead bolt 2a on the substantially center line of the hole of the winding part of the coil 11a.

  The drive unit 12 is a circuit for outputting a displacement amount signal corresponding to the displacement of the core 11b with respect to the coil 11a, an oscillation circuit 12a for outputting a predetermined oscillation signal, and a drive signal to the coil 11a by an oscillation signal from the oscillation circuit 12a. A coil drive circuit 12b for supplying a signal, a detection circuit 12c for detecting an impedance change of the coil 11a, a signal processing circuit 12d for processing a detection signal of the detection circuit 12c and obtaining a displacement amount signal corresponding to the displacement of the core 11b relative to the coil 11a, An output circuit 12d that outputs a displacement amount signal obtained by the processing of the signal processing circuit 12d is provided.

  Here, the impedance of the coil 11a of the sensor unit 11 varies depending on how much the core 11b is inserted into the hole at the center of the winding portion of the coil 11a. The impedance change is detected and signal-processed by the drive unit 12 to output a displacement amount signal corresponding to the displacement of the core 11b.

  Thus, in the locking / unlocking position detecting means 3, the displacement amount of the dead bolt 2a from the change of the impedance of the coil 11a accompanying the movement of the core 11b in the hole of the winding part of the coil 11a interlocked with the dead bolt 2a at the time of locking / unlocking. Is detected. At that time, the output signal (displacement amount signal) of the drive unit 12 changes depending on how much the core 11b moving in conjunction with the dead bolt 2a is inserted into the hole in the winding portion of the coil 11a. The position of the dead bolt 2a can be accurately determined by the value (change amount).

  Thereby, even if the dead bolt 2a exists in the intermediate position which is not locked / unlocked, the position of the dead bolt 2a can be detected accurately.

  The control means 4 compares the displacement amount signal from the unlocking position detecting means 3 with the locking reference value and the unlocking reference value set according to the position of the dead bolt 2a with respect to the locking hole 7a, and these reference values The current position of the dead bolt 2a (protrusion situation) is determined from the difference in displacement amount signal with respect to. In addition, since the distance between the door and the door frame may change depending on the use situation, the reference value is appropriately set to an optimum value according to this distance. Further, the control means 4 is configured to detect a current lock / unlock state based on a displacement amount signal from the lock position detection means 3 and a known door opening / closing detection sensor when a lock instruction or an unlock instruction is input from the outside. The drive means 5 outputs a lock command or an unlock command to the drive means 5 to move the dead bolt 2a forward and backward according to the current open / close state of the door based on the detection signal (open / closed door state monitor signal) is doing.

  The drive means 5 is constituted by a motor, an actuator, or the like that is driven by a lock command or an unlock command from the control means 4. The driving means 5 drives the locking / unlocking mechanism 2 (power transmission mechanism 2b) so that the dead bolt 2a protrudes and locks into the locking hole 7a of the strike 7 when a locking command is input from the control means 4. When the unlocking command is input from the control means 4, the locking / unlocking mechanism 2 (power transmission mechanism 2 b) is driven so that the dead bolt 2 a is pulled from the locking hole 7 a of the strike 7.

  Next, operation | movement of the electric lock 1 by the said structure is demonstrated. First, when an instruction for locking / unlocking operation is input from the outside to the control means 4 (ST1), the current locking / unlocking state is determined based on the displacement amount signal from the locking / unlocking position detecting means 3 (ST2). Thereafter, it is determined whether the operation content is to be locked or unlocked in accordance with the current open / closed state of the door (ST3).

  When the operation content is determined, the control unit 4 outputs a locking command or unlocking command to the driving unit 5 and starts driving energization or unlocking by driving the driving unit 5 (ST4). By this energization of locking or unlocking, the dead bolt 2 moves forward and backward by a predetermined displacement with respect to the locking hole 7a of the strike 7. At that time, the control means 4 always takes the displacement amount signal from the locking / unlocking position detection means 3 and recognizes the operating condition (protruding condition) of the dead bolt 2a at the time of locking energization or unlocking energization (ST5). And the control means 4 controls the drive means 5 to perform the locking / unlocking energization in accordance with the displacement amount signal from the locking / unlocking position detecting means 3 (ST6). Thereafter, the control unit 4 determines whether or not energization is completed (ST7), and controls the drive unit 5 to perform the locking and unlocking energization until the energization is completed.

  Thus, according to the electric lock 1 of this example, the position (protrusion state) of the dead bolt 2a with respect to the locking hole 7a of the strike 7 provided in the door frame can be accurately detected during the locking / unlocking control. . And at the time of locking energization or unlocking energization, the operating condition (protruding condition) of the dead bolt 2a is always recognized, and the forward / backward movement of the dead bolt 2a is controlled according to the operating condition, so that the dead bolt 2a is normally locked. It can move to a position or an unlocking position to perform a reliable unlocking operation.

  In the embodiment described above, the dead bolt 2a that moves forward and backward by linear displacement with respect to the locking hole 7a of the strike 7 is described as an example of the locking member for locking and unlocking the lock. A hook lock that moves forward and backward by rotational displacement with respect to the stop hole 7a may be used as the locking member. Even when the hook lock is used as the locking member 2a, the rotational displacement amount of the hook lock can be detected by the same detection principle as that of the dead bolt described above.

It is a block diagram which shows the principal part of the electric lock which concerns on this invention. (A), (b) It is a schematic block diagram of the locked state and unlocked state of the electric lock concerning this invention.

Explanation of symbols

1 Electric lock 2 Locking / unlocking mechanism 2a Dead bolt (locking member)
2b Power transmission mechanism 3 Locking / unlocking position detection means 4 Control means 5 Drive means 6 Lock box 7 Strike 7a Locking hole 11 Sensor part 11a Coil 11b Core (metal body)
12 Drive unit

Claims (2)

In the electric lock that locks and unlocks the lock by moving the locking member forward and backward with respect to the locking hole of the strike provided in the door frame,
A coil that is fixed at a predetermined position in the lock box, and a metal body that partially engages with the winding member of the coil and interlocks with the locking member, and that interlocks with the locking member during locking and unlocking. An electric lock comprising: a locking / unlocking position detecting means for detecting a displacement amount of the locking member from a change in impedance of the coil accompanying movement of the metal body in a coil winding portion. 2. The electricity according to claim 1, wherein the amount of movement of the locking member is controlled in accordance with a current locking / unlocking state based on a detection signal from the locking / unlocking position detecting means at the time of locking energization or unlocking energization. Tablets.

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