JP3236619U - Box with electronic lock - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a box with an electronic lock which is easy for a user to assemble and surely operates with low power consumption even if it is roughly assembled. SOLUTION: The coil 3b, the movable iron core 3f with a magnet, another magnet 3e, the rotation lock claw 3g, and the latch 2 attached to the lid side are held, and the movable iron core 3f with a magnet and another magnet 3e replace the spring. By inputting the correct password, the coil 3b is energized, and the movable iron core 3f with a magnet is moved by the magnetic field of the coil 3b, so that the rotary lock claw 3g rotates and unlocks. In addition, energization of the coil repeats energization / de-energization multiple times. This makes it possible to realize a box with an electronic lock that reliably operates with low power consumption even when assembled roughly. [Selection diagram] FIG. 4

Description

The present invention relates to a box with an electronic lock device, and particularly to a method that is easy for the user to assemble as a work kit, consumes less power, and operates reliably.

Boxes with lids, especially treasure chests, that can be assembled by users such as students are commercially available. When providing a box that can be assembled including an electronic lock so that users are interested in electronic circuits and software, the accuracy of the work varies from person to person, so it is necessary to provide a work kit that works reliably with a simple mechanism. be. In addition, since the electronic lock allows current to flow through the coil, low power consumption is desirable, especially when the battery is used as a power source. This is because if the power consumption is not low, the capacity of the battery will be reduced immediately and the operation of the circuit will become unstable, and it cannot be said that the operation is reliable.

Patent Document 1 discloses a structure of a treasure box with a lock, but does not disclose a method of attaching an electronic lock to the treasure box. Further, Patent Document 2 discloses the structure of the electronic lock, but does not disclose a method for the user to easily assemble and operate reliably.

Akira Jinkai 60-121794 JP 2011-43044

The problem is the structure of a box with an electronic lock that is easy for the user to assemble, has low power consumption, and operates reliably even when assembled roughly.

It has a coil, a movable iron core with a magnet, another magnet, a rotary lock claw, and a latch attached to the lid side. When the lid is closed, the latch pushes the rotary lock claw in the unlocking direction to energize the coil. Instead, the latch is caught by the rotary lock claw and locked. The movable iron core with a magnet is installed in the direction of the magnetic field that pulls against another magnet, and when the coil is energized, the magnetic field is generated from the coil in the direction that the movable iron core moves away from the other magnet, and the rotation connected to the movable iron core. The lock claw rotates in the unlocking direction and is unlocked to open the lid. Another magnet is arranged so that the distance from the coil can be changed. The axis of the movable iron core with magnet should be installed almost vertically to the ground. A differentiating circuit is used for the drive circuit of the coil, and the coil is energized / de-energized multiple times.

When the lid is closed, the latch pushes the rotary lock claw in the unlocking direction, which locks the coil without energizing it, resulting in low power consumption. If you try to lift the lid in that state, the latch will try to rotate the rotary lock claw, but since it does not rotate in the unlocking direction, it can be locked securely even if the assembly accuracy is a little poor.

By using a movable iron core with a magnet, the strength of the magnetic field generated in the coil can be reduced, resulting in low power consumption. By using another magnet to attract the movable iron core with a magnet when the coil is not energized, the movable iron core can be attracted without using a spring that is easy to fly and lose, making it easier to assemble.

If the distance between another magnet and the coil can be changed, the force that attracts the movable iron core can be adjusted, so even if the assembly accuracy is a little poor, it can be locked securely. Since the axis of the movable iron core with a magnet is installed substantially vertically to the ground, it is possible to prevent the movable iron core with a magnet from rubbing in one direction on the inner surface of the coil shaft hole and to lock it securely.

By using a differentiating circuit for the coil drive circuit, the operation of the microcomputer becomes indefinite when the power supply voltage drops, and the coil can be prevented from continuing to be energized. It works reliably. Further, by repeatedly energizing / de-energizing the coil a plurality of times, it is possible to reduce the catching of the lock portion even when it is loosely assembled, and it operates reliably.

It is an overall view which shows one Example of the box with an electronic lock of this invention. It is a block diagram which shows one Example of the electronic lock part and the substrate of this invention. It is an exploded view which shows one Example of the electronic lock part of this invention. It is a partial cross-sectional view of the center of an electronic lock part and a lid of this invention. It is a circuit diagram which shows an Example of the coil drive circuit mounted on the board of this invention.

The lid 1b is connected to the box body 1a with a hinge (not shown) and can be opened and closed. The latch 2 is attached to the lid 1b so that when the lid 1b is closed, the latch 2 is caught and locked by the rotary lock claw 3g of the electronic lock portion 3. When the coil 3b is not energized, the movable iron core 3f with a magnet is attracted to another magnet 3e.

When the substrate 4 is operated and the coil is energized, the movable iron core 3f with a magnet repels the magnetic field of the coil and is pushed up in a direction away from another magnet 3e. The rotary lock claw 3g loosely fitted to the pushed-up movable iron core 3f with a magnet via the connecting part 3fd rotates clockwise in the figure, the small claw part of the rotary lock claw 3g is hidden, the latch 2 comes off, and the lid 1b. Can be opened. The energization of the coil is programmed by the microcomputer 4a so as to repeat energization / non-energization a plurality of times.

Hereinafter, an embodiment will be described with reference to the accompanying drawings. Reference numeral 1 denotes a treasure box-shaped box that can be assembled by the user using an appropriate material such as an MDF board or plastic, and consists of a box body 1a in which the user can put important items and a box lid 1b. A latch 2 is attached to the lid 1b, and the lid 1b is connected to the box body 1a with a hinge (not shown) so that it can be opened and closed.

A front panel 1aa is attached to the front surface of the box body 1a to perform power supply and password input operations, and to fix the electronic lock unit 3. The latch 2 is made of plastic and is attached so as to be caught and locked by the rotary lock claw 3g of the electronic lock portion 3 when the lid 1b is closed.

The electronic lock portion 3 includes a coil 3b, another magnet 3e, a movable iron core with a magnet 3f, a rotary lock claw 3g, and a coil holder 3a for holding them, and is made of metal, plastic, or the like. The board 4 on which the drive circuit for energizing the coil 3b is mounted includes circuit parts such as the power supply and the microcomputer 4a for password input operation, for example, a MOSFET switch 4d, a power supply switch (not shown), and a plurality of push switches. Will be implemented.

In the coil 3b, for example, a polyurethane-coated copper wire having a diameter of 0.29 mm is wound around the bobbin 3c, and both ends of the copper wire are connected to the substrate 4. The bobbin stopper 3d is made of plastic or the like and is made into a shape that can be inserted into the bobbin 3c placed in the coil holder 3a from below, and the bobbin 3c is fixed to the coil holder 3a. Another magnet 3e is manually press-fitted into the groove hole of the bobbin stopper 3d, can move in the axial direction of the groove hole, and can adjust the distance to the coil.

The movable iron core 3fa constituting the movable iron core 3f with a magnet uses, for example, an iron M3 countersunk screw, and the magnet 3fb and the magnet 3fc use, for example, a plated cylindrical neodymium magnet having a diameter of 6 mm and a thickness of 3 mm. The 3fc and the movable iron core 3fa are fixed with an adhesive or the like, or are naturally connected by a magnetic force even if they are not fixed, and are configured to be inserted into the central hole of the bobbin 3c so that they can move linearly. Further, if the movable iron core 3f with a magnet is arranged substantially vertically with the ground, the influence of burrs and friction on the central hole wall of the bobbin 3c can be reduced.

The connecting part 3fd is made of, for example, plastic or iron, is screwed and fixed to the shaft portion of the movable iron core 3fa, and the rotary lock claw 3g is converted from the linear motion of the movable iron core 3f with a magnet into the rotational motion of the rotary lock claw 3g. It is loosely fitted to the claw part of. The rotary lock claw 3g is made of plastic or the like, and is connected to both holes of the coil holder 3a by a shaft 3h made of metal or the like so as to be rotatable.

As for the operation, a battery (not shown), for example, two AAA alkaline batteries are inserted and connected in series to operate the substrate 4. A microcomputer 4a, a switch 4d, a power switch (not shown), a plurality of push switches, etc. are attached to the board 4, the power switch is turned on, and the correct password (pushing order) saved in the Flash memory or EEPROM in the microcomputer 4a in advance is used. When a plurality of push switches are pressed in order, a buzzer and an LED (not shown) sound, and then the coil drive port of the microcomputer 4a is driven to HI.

Then, the voltage change driven by the HI drives the gate of the switch 4d by the differentiating circuit composed of the capacitor 4b and the resistor 4c, and the switch 4d is turned on to energize the coil 3b. By repeatedly driving the coil drive port in the order of LO → HI → LO → HI, the switch 4d can be repeatedly driven. As an example of the value, the capacitor 4b is, for example, 10uF, the resistor 4c is 100k ohms, and the switch 4d is driven by setting the cycle of the repeated drive to 2 Hz.

By configuring the differentiating circuit, the battery voltage drops, the operation of the microcomputer 4a becomes unstable, and even if the coil driving port is held by HI, the switch 4d does not continue to drive, and the coil 3b It is possible to avoid becoming a dangerous state due to continuous heat generation and high temperature.

The movable iron core 3f with a magnet is installed on the pole inserted into the coil 3b, for example, on the N pole, and another magnet 3e is installed on the magnetic pole on the coil 3b side, for example, on the S pole. Even if there is no spring, it is attracted to another magnet 3e. That is, it is a substitute for a spring.

In that state, when the lid 1b is closed and the latch 2 hits the small claw portion on the opposite side of the claw portion of the rotation lock claw 3g by about 150 degrees, the rotation lock claw 3g rotates to the right in FIG. 4 and the latch 2 rotates downward as it is. Since the movable iron core 3f with a magnet is pushed in and attracted to another magnet 3e, the small claw portion fits into the groove of the latch 2 and is locked.

Once locked, when the latch 2 tries to move upward in an attempt to open the lid 1b, the small claw portion of the rotary lock claw 3g is pulled by the groove of the latch 2 and tries to rotate counterclockwise in FIG. It hits the bobbin 3c and does not rotate further to the left, and as a result remains locked.

When the coil 3b is energized, for example, the magnet-equipped movable iron core 3f side of the coil 3b is excited by the N pole, so that the force repels the N pole of the magnet-equipped movable iron core 3f and a force acts in the direction away from the coil 3b. Then, the rotary lock claw 3g is rotated clockwise by the connecting component 3fd in FIG. 4, and the small claw portion on the opposite side of the claw portion is directed downward to hide behind the coil holder 3a and the latch 2 is disengaged. The lid 1b can be opened.

1 Box 1a Box body 1aa Front panel 1b Lid 2 Latch 3 Electronic lock 3a Coil holder 3b Coil 3c Bobbin 3d Bobbin stop 3e Separate magnet 3f Movable iron core with magnet 3f Movable iron core 3fb Magnet 3fc Magnet 3fd Rotating parts 3h Shaft 4 Board 4a Microcomputer 4b Capacitor 4c Resistance 4d Switch 4e Diode

Claims (5)

It has a coil, a movable iron core with a magnet, another magnet, a rotation lock claw, and a latch attached to the lid side, and the movable iron core with a magnet and another magnet act as a spring, and the coil is energized by entering the correct password. A box with an electronic lock, which is characterized by the fact that the movable iron core with a magnet moves by the magnetic field of the coil, and the rotation lock claw rotates and unlocks. The box with an electronic lock according to claim 1, wherein the other magnet is capable of adjusting the distance from the coil. 2. Box with electronic lock as described. The box with an electronic lock according to claim 1, wherein the direction of the axis of the movable iron core with a magnet is installed substantially vertically to the ground. A switch is driven by a differentiating circuit composed of a capacitor and a resistor, and the coil connected in series with the switch is energized. The coil is energized and de-energized multiple times in succession. A featured box with an electronic lock.

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