JP5740331B2 - Electric lock - Google Patents

Description

  The present invention relates to an electric lock that electrically locks and unlocks a door (sliding door or hinged door), a drawer, and the like.

  2. Description of the Related Art As a conventional electric lock, a motor type electric lock that moves and locks a motor by energization is known. The electric lock has a feature that it can be remotely operated from a remote place and that the door can be locked and unlocked from a remote place.

  The motor type electric lock performs both locking and unlocking by energizing the motor. The rotation of the output shaft of the motor is transmitted to the dead bolt via the gear train. By rotating the motor in one direction, the dead bolt protrudes from the case and can be locked. By rotating the motor in the other direction, the dead bolt enters the case and can be unlocked (see Patent Document 1).

JP-A-7-26809

  However, since the motor-type electric lock described in Patent Document 1 requires a large number of gears, there is a problem that the outer dimensions of the electric lock are increased.

  Then, an object of this invention is to provide the electric lock which can achieve size reduction.

In order to solve the above problems, the present invention provides a case, a motor accommodated in the case, a screw shaft connected to an output shaft of the motor, guided to the case so as to be linearly movable, A slider having a female screw that can mesh with a screw shaft, a dead bolt that can protrude and retract from the case , and a spring that urges the dead bolt against the slider so that the dead bolt interlocks with the slider . When the motor rotates the screw shaft in one direction around the axis, the slider linearly moves in one direction in the axial direction of the screw shaft, and the dead bolt that contacts the slider protrudes from the case, When the motor rotates the screw shaft in the other direction, the slider linearly moves in the other direction of the axial direction of the screw shaft, and the slide The dead bolt abut against the is electric lock entering into the case.

  According to the present invention, since the dead bolt that contacts the slider is driven by the linear motion of the slider, a large number of gears are not required, and the electric lock can be downsized.

The perspective view of the hinged door type showcase in which the electric lock of one embodiment of the present invention was incorporated (FIG. 1 (a) shows a state where the hinged door is closed, and FIG. 1 (b) shows a state where the hinged door is opened) Sectional drawing of the main plate of the housing | casing of the showcase of FIG. The perspective view of the sliding door type showcase in which the electric lock of the present embodiment is incorporated (FIG. 3 (a) shows a state where the electric lock is removed, and FIG. 3 (b) shows a state where the electric lock is embedded). A perspective view of a drawer-type showcase in which the electric lock of this embodiment is incorporated (FIG. 4A shows a state in which the drawer is opened, and FIG. 4B shows a state in which the drawer is closed). The exploded perspective view of the electric lock of this embodiment The perspective view which shows the example which attaches the electric lock of this embodiment to a ground plane using an oblique through-hole. Sectional drawing of the main board which embedded the electric lock of this embodiment (FIG. 7 (a) shows an example with thick board thickness, FIG.7 (b) shows an example with thin board thickness) FIG. 8A is a plan view, FIG. 8B is a cross-sectional view taken along the line bb, FIG. 8C is a cross-sectional view taken along the line cc, and FIG. 8 (d) shows a sectional view taken along the line dd). FIG. 9A is a sectional view taken along the line bb of FIG. 8A, and FIG. 9B is a sectional view taken along the line cc of FIG. 8A. Indicate) Detailed view showing non-engagement of screw shaft and slider of electric lock of this embodiment Configuration diagram of the control system of this embodiment

  Hereinafter, an electric lock according to an embodiment of the present invention will be described in detail with reference to the drawings. The electric lock of this embodiment is used for locking and unlocking a hinged door, a sliding door, or a drawer. Since the electric lock is small and the dead bolt has a structure that can receive loads in three directions of X, Y, and Z, it can correspond to any of these hinged doors, sliding doors, or drawers with one electric lock. 1 and 2 show an example in which the electric lock of the present embodiment is used for a showcase hinged door 1, FIG. 3 shows an example in which the electric lock is used for a showcase sliding door 13, and FIG. Show.

  The electric lock motor is controlled by a control system using RFID (Radio Frequency IDentification) technology. As shown in FIG. 1, when the card storing the ID information is held over the antenna unit 3, the electric lock can be locked and unlocked. The control unit 4 processes information read by the antenna unit 3 and controls the motor of the electric lock 7. A control system including the card, the antenna unit 3 and the control unit 4 will be described later.

  As shown in FIG. 1, a pair of double doors 1 are attached to the front surface of the housing 2 so as to be openable and closable. 1A shows a state in which the hinged door 1 is closed, and FIG. 1B shows a state in which the hinged door 1 is opened. An electric lock 7 is embedded in the ground plane 2a of the housing 2 (see also FIG. 2). A hole 2a1 is formed in the main plate 2a, and an electric lock 7 having a substantially rectangular parallelepiped shape is embedded in the hole 2a1. The upper surface of the electric lock 7 is covered with a decorative plate 8 in which slits are formed. The dead bolt 11 of the electric lock 7 appears and disappears from the slit of the decorative plate 8. A receiving seat 6 is attached to the lower part of the glass hinged door 1. The receiving seat 6 is formed with a hole 6 a that fits into the dead bolt 11 protruding from the electric lock 7.

  As shown in FIG. 1B, the dead bolt 11 is in the electric lock 7 when unlocked. The dead bolt 11 is waiting for the hinged door 1 to be closed in the state where it is in the electric lock 7. When the hinged door 1 is closed, as shown in FIG. 2, the dead bolt 11 protrudes from the electric lock 7 and fits into the hole 6 a of the receiving seat 6 to lock the hinged door 1. The reed switch (not shown) detects that the hinged door is closed. The control unit 4 receives the signal from the reed switch and controls the motor so that the dead bolt 11 protrudes.

  FIG. 3 shows an example in which the electric lock 7 of this embodiment is used in a showcase having a sliding door. As shown in FIG. 3A, the electric lock 7 is embedded in the ground plane 12 a of the housing 12. The electric lock 7 is covered with a decorative plate 8. A receiving seat 14 is attached to the lower part of the sliding door 13 made of glass. A hole that fits into the dead bolt 11 of the electric lock 7 is formed in the receiving seat 14. As shown in FIG. 3B, the dead bolt 11 of the electric lock 7 is in the electric lock 7 when unlocked. In this state, the electric lock 7 waits for the sliding door 13 to close. When the sliding door 13 is closed, the dead bolt 11 protrudes from the electric lock 7 and the sliding door 13 is locked.

  FIG. 4 shows an example in which the electric lock 7 of the present embodiment is used for the drawer. As shown in FIG. 4A, the electric lock 7 is embedded in the side plate 16 a of the housing 16. A receiving seat 17 is attached to the drawer 15. The receiving seat 17 is formed with a hole 17 a that fits into the dead bolt 11 of the electric lock 7. As shown in FIG. 4B, when the drawer is closed, the dead bolt 11 protrudes from the electric lock 7, and the dead bolt 11 is fitted into the receiving seat 17 in the hole. Thereby, the drawer 15 is locked.

  FIG. 5 shows an exploded perspective view of the electric lock 7 of the present embodiment. The electric lock 7 of this embodiment includes a case 21 (21a and 21b), a motor 22, a screw shaft 23, a slider 24, a dead bolt 11, a rotary shaft 25, a torsion spring 26, a coil spring 27, and a substrate 28 as constituent elements. . Hereinafter, these components will be described in order.

  The case 21 includes a case main body 21a and a cover 21b that covers the upper surface of the case main body 21a. The case body 21a is formed with a guide path 21-2 for guiding the motor accommodating portion 21-1 and the slider 24 to linearly move. The case main body 21a accommodates a motor 22 to which a screw shaft 23 is connected. A pair of rotating shaft support walls 21-3 is formed on the left and right sides of the screw shaft 23 in the case body 21 a. A recess for receiving the rotation shaft 25 is formed in the upper portion of the rotation shaft support wall 21-3. The case body 21 a is formed with a screw shaft support wall 21-4 that supports the tip of the screw shaft 23. A recess for receiving the screw shaft 23 is formed on the upper portion of the screw shaft support wall 21-4.

  The cover 21b is attached to the case main body 21a by a coupling means such as a bolt 29. The cover 21b is formed with a slit 30 for allowing the dead bolt 11 to appear and disappear. When the cover 21b is attached to the case main body 21a, the motor 22 is sandwiched in the vertical direction between the case main body 21a and the cover 21b (see FIG. 8B). Further, the rotating shaft 25 is sandwiched between the concave portion of the rotating shaft support wall 21-3 of the case main body 21a and the cover 21b so that it does not come out of the concave portion. The screw shaft 23 is sandwiched between the concave portion of the screw shaft supporting wall 21-4 of the case main body 21a and the cover 21b so that the screw shaft 23 does not come out of the concave portion.

  As shown in FIG. 5, the cover 21b is formed with a through hole 31 into which the mounting screw 32 (see FIG. 6) is inserted obliquely. The electric lock 7 is embedded in the ground plane 2 a of the housing 2. In this case, as shown in FIG. 7 (a), a hole 2a1 corresponding to the height of the case 21 of the electric lock 7 is made in the ground plate 2a, or as shown in FIG. It is necessary to open the hole 2a1 (as shown in FIG. 7 (b), when the thickness of the base plate 2a is smaller than the height of the electric lock 7, a step is provided so as to penetrate the hole 2a1 and prevent the electric lock from falling off. Need to be a hole 2a1 with a As shown in FIG. 5, the cover 21b of the case 21 is also formed with a through hole 33 into which a mounting screw can be straightly inserted. In many cases, this is not possible because of the small amount on the 2a side. The electric lock 7 can be firmly fixed to the main plate 2a by screwing the mounting screw 32 diagonally.

  As shown in FIG. 5, the motor 22 is accommodated in the motor accommodating portion 21-1 of the case 21. A screw shaft 23 is press-fitted into the output shaft of the motor 22. The screw shaft 23 rotates about the axis integrally with the output shaft of the motor 22.

  The screw shaft 23 is divided into three regions in the axial direction. They are a central meshing part 23a where a male screw is formed, a non-meshing part 23b on the motor 22 side, and a support part 23c on the tip side. A helical male screw is formed on the outer peripheral surface of the meshing portion 23a. No male screw is formed on the non-meshing portion 23b and the support portion 23c. The non-meshing portion 23b is formed in a cylindrical shape having an outer diameter equal to the inner diameter of the male screw.

  The slider 24 includes a rectangular parallelepiped body portion 24a and a cam portion 24b coupled to the side surface of the body portion 24a. A through hole 24a1 is formed in the main body 24a, and a female screw is formed on the inner peripheral surface of the through hole 24a1. The internal thread of the main body part meshes with the external thread of the screw shaft 23. The linear motion in the axial direction of the screw shaft 23 of the main body 24 a of the slider 24 is guided to the guide path 21-2 of the case 21. The main body 24 a is not rotatable around the axis of the screw shaft 23. When the motor 22 rotates the screw shaft 23 around the axis, the slider 24 linearly moves in the axial direction of the screw shaft 23.

  The main body 24a has a bottom surface 24a2 parallel to the axis of the screw shaft 23, and an upper surface 24a4 parallel to the bottom surface 24a2. The bottom surface 24a2 of the main body 24a contacts the case main body 21a. The upper surface 24a4 of the main body 24a comes into contact with the cover 21b. The side surface 24a3 of the main body 24a contacts the guide wall 21-5 of the case main body 21a. In order to reduce the slip resistance of the main body 24a, a relief groove extending in the axial direction of the screw shaft 23 is formed on the bottom surface 24a2 of the main body 24a. The ridges formed on the left and right ends of the bottom surface 24a2 of the main body portion 24a come into contact with the case main body 21a by the escape grooves.

  The cam portion 24b includes an upper surface 24b1 that contacts the dead bolt 11 in a state of protruding from the case 21, and an inclined surface 24b2 that is inclined downward from the front end of the upper surface 24b1 in the X direction. When viewed from the side of the screw shaft 23, the upper surface 24b1 of the cam portion 24b is parallel to the axis of the screw shaft 23, and the inclined surface 24b2 is inclined with respect to the axis of the screw shaft 23 (see FIG. 8B). ). When the dead bolt 11 is protruded from the case, the inclined surface 24b2 of the cam portion 24b pushes the inclined surface 11a of the dead bolt 11. When the projection of the dead bolt 11 is completed, the upper surface 24b1 of the cam portion 24b comes into contact with the inclined surface 11a of the dead bolt 11 (see FIG. 9B). A groove extending in the axial direction of the screw shaft 23 is formed on the upper surface 24b1 of the cam portion 24b. A plurality of ridges formed by the grooves abut on the dead bolt 11.

  The coil spring 27 is interposed between the motor 22 and the slider 24 (see FIG. 8B). When the slider 24 moves close to the motor 22, the coil spring 27 is compressed, and the coil spring 27 applies a biasing force to the slider 24 in a direction away from the motor 22. As will be described in detail later, when the slider 24 moves to the end of the screw shaft 23 on the motor 22 side, the male screw of the screw shaft 23 and the female screw of the slider 24 are disengaged. The coil spring 27 urges the female screw of the slider 24 to the male screw of the screw shaft 23 so that when the motor 22 rotates in the reverse direction, the female screw of the slider 24 disengaged surely engages with the male screw of the screw shaft 23. To do. By interposing the coil spring 27 between the motor 22 and the slider 24, the space for installing the coil spring 27 can be reduced, and the electric lock 7 can be downsized.

  The rotating shaft 25 is supported by the rotating shaft support wall 21-3 of the case body 21a and extends in a direction perpendicular to the axis of the screw shaft 23. A dead bolt 11 is rotatably attached to the rotary shaft 25. The dead bolt 11 is formed with a through hole 11b through which the rotary shaft 25 passes. When the dead bolt 11 rotates around the rotation shaft 25 in the locking direction (one direction), the dead bolt 11 protrudes from the case 21 and enters a locked state. When the dead bolt 11 rotates around the rotary shaft 25 in the unlocking direction (other direction), the dead bolt 11 enters the case 21 and enters the unlocked state.

  The rotational movement of the dead bolt 11 is linked to the linear movement of the slider 24. By rotating the dead bolt 11, the amount of protrusion of the dead bolt 11 can be increased even if the stroke of the slider 24 is small as compared with the case where the dead bolt 11 is moved linearly. Further, the larger the protruding amount of the dead bolt 11 is, the larger the chilli dimension (the gap between the door and the frame) of the door can be increased. When the deadbolt 11 is linearly moved, if the moving direction of the deadbolt 11 and the stroke of the slider 24 are made parallel, the stroke of the slider 24 is required for the stroke of the deadbolt 11, so the external dimensions of the electric lock 7 are It gets bigger.

  The outline of the dead bolt 11 is formed in a fan shape (see also FIG. 8C). The dead bolt 11 has an arc surface 11-1 and a pair of radial surfaces 11-2. The lower radial surface 11-2 includes an inclined surface 11a and a flat surface 11c. The flat surface 11c is parallel to the upper radial surface 11-2. In the unlocked state where the dead bolt 11 enters the case 21, the flat surface 11c of the dead bolt 11 contacts the case main body 21a. The inclined surface 11a is inclined in the same manner as the inclined surface 24b2 of the cam portion 24b of the slider 24. In the unlocked state, the inclined surface 11a of the dead bolt 11 and the inclined surface 24b2 of the cam portion 24b of the slider 24 are inclined. The angle is equal. In the unlocked state, the flat surface 11c of the dead bolt 11 is in contact with the case body 21a. Strictly speaking, it is between the inclined surface 11a of the dead bolt 11 and the inclined surface 24b2 of the cam portion 24b of the slider 24. Is slightly vacant.

  The dead bolt 11 is provided with a stopper portion 11d that contacts the cover 21b of the case 21 so as to restrict the dead bolt 11 protruding from the case 21 from rotating further in the locking direction (see also FIG. 9B). ). 11 d of stopper parts are formed in the lower end part of the circular arc surface 11-1 of the dead bolt 11, and protrude in the radial direction from the circular arc surface 11-1. When the dead bolt 11 rotates by a predetermined angle in the locking direction, the stopper portion 11d contacts the inside of the cover 21b.

  The dead bolt 11 is movable in the axial direction of the rotating shaft 25. When a load in the center line direction (Y direction) of the rotary shaft 25 is applied to the dead bolt 11 protruding from the case 21, the side surface of the dead bolt 11 hits the wall surface 30 a that forms the slit 30. For this reason, movement in the Y direction is restricted by the dead bolt 11. Since the load acting on the Y direction of the dead bolt 11 is distributed to the dead bolt 11 and the cover, the load acting on the Y direction of the dead bolt 11 can be received.

  Further, when a load in the X direction is applied to the dead bolt 11 protruding from the cover 21b, the stopper portion 11d of the dead bolt 11 comes into contact with the inside of the cover 21b. The load acting on the dead bolt 11 in the X direction is distributed to the dead bolt 11, the rotary shaft 25, and the cover 21b. Therefore, the load which acts on the X direction of the deadbolt 11 can be received.

  As described above, since the dead bolt 11 protruding from the case 21 can receive the load in the X direction and the Y direction, the hinged door shown in FIG. 1 (example in which the load in the Y direction acts on the dead bolt 11), It can be seen that any of the sliding doors shown in FIG. 3 (an example in which a load in the X direction acts on the dead bolt 11) can be handled.

  A torsion spring 26 (torsion coil spring) that biases the dead bolt 11 against the slider 24 is attached to the rotary shaft 25 in order to link the linear motion of the slider 24 and the rotational motion of the dead bolt 11. The dead bolt 11 is in direct contact with the slider 24 (see FIG. 9B). The torsion spring 26 biases the dead bolt 11 against the slider 24 so that the dead bolt 11 does not move away from the slider 24. As shown in FIG. 4, when the electric lock 7 is attached to the side plate 16a of the housing 16, the dead bolt 11 rotates in a horizontal plane. In this case, if the torsion spring 26 is not provided, the slider 24 and the dead bolt 11 cannot be interlocked. By providing the torsion spring 26, the slider 24 and the dead bolt 11 can be interlocked regardless of the direction of gravity.

  The substrate 28 is provided with only one micro switch 34 as a detection device. The micro switch 34 is arranged for detection on the lock side in order to detect that the lock is surely locked, focusing on the key which is the basic function of the electric lock 7. When the dead bolt 11 rotates by a predetermined angle in the locking direction, the slider 24 comes into contact with the micro switch 34. The substrate 28 is not provided with a micro switch for detecting the unlocking side.

  During locking, the control unit 4 receives a signal from the microswitch 34 and stops the motor 22. When unlocking, the control unit 4 drives the motor 22 in the release direction for a predetermined time. By using only one micro switch 34 for detecting the position of the dead bolt 11, the external dimensions of the electric lock 7 can be reduced as compared with the case where two micro switches for detecting the locked state and the unlocked state are provided. Can be planned.

  The movement of the slider 24 and the dead bolt 11 will be described with reference to FIGS. FIG. 8 shows the unlocked state, and FIG. 9 shows the locked state. 8 (a) is a plan view of the electric lock 7, FIGS. 8 (b) and 9 (a) are vertical sectional views including the center line of the screw shaft 23, and FIGS. 8 (c) and 9 (b). ) Shows a vertical sectional view including the dead bolt 11.

  As shown in FIGS. 8B and 8C, in the unlocked state, the slider 24 moves to the end of the screw shaft 23 on the motor 22 side. When the motor 22 is rotated in the locking direction from this state, the slider 24 moves toward the tip of the screw shaft 23. Then, the inclined surface 24b2 of the cam portion 24b of the slider 24 pushes the dead bolt 11, and the dead bolt 11 rotates in the locking direction and protrudes from the case 21. Eventually, as shown in FIGS. 9A and 9B, the slider 24 moves to the tip of the meshing portion 23a of the screw shaft 23, and is locked. In the locked state, the slider 24 sinks under the dead bolt 11, and the upper surface 24 b 1 of the cam portion 24 b of the slider 24 comes into contact with the dead bolt 11. In order to change from the locked state to the unlocked state, the motor 22 may be rotated in the unlocking direction.

  The electric lock 7 of this embodiment has the following effects. Since the dead bolt 11 that contacts the slider 24 is driven by the linear motion of the slider 24, a large number of gears are not required, and the electric lock 7 can be downsized. Moreover, even if a load in the unlocking direction is applied to the dead bolt 11 in the locked state, the dead bolt 11 can be prevented from unlocking due to the self-locking effect of the screw (low reverse efficiency of the screw). Moreover, since the upper surface 24b1 of the cam portion 24b of the slider 24 and the axis of the screw shaft 23 are parallel to each other, as shown in FIG. 9B, even if a load P that pushes down the dead bolt 11 in the locked state acts. A load in the axial direction of the screw shaft 23 does not act on the slider 24. This, combined with the self-locking effect of the screw, can reliably prevent the dead bolt 11 from rotating in the unlocking direction. Furthermore, the operation speed of locking / unlocking can be made faster than a conventional motor-type electric lock that uses a gear to decelerate the rotation of the motor and transmits the rotation to the dead bolt.

  As shown in FIG. 9B, when a load P that pushes down the dead bolt 11 in the locked state acts, the load acting on the dead bolt 11 is transmitted to the case body 21 a via the slider 24. Since the load P that pushes down the dead bolt 11 is dispersed in the slider 24 and the case 21, it is possible to receive the load in the Z direction of FIG.

  The reason why only one micro switch 34 is provided and the slider 24 and the screw shaft 23 are disengaged will be described below. As described above, there is only one micro switch 34, and only the locked state is detected. Specifically, the movement of the slider 24 is detected by a micro switch, and the operation of the motor 22 is stopped after detecting the locking. Since the micro switch is not arranged on the unlocking side due to the small size, the unlocking operation is controlled only by the driving time of the motor 22. At this time, even if the driving time of the motor 22 is constant due to variations in parts, the moving distance of the slider 24 is different, so it is necessary to set the driving time of the motor 22 longer. Since the screw shaft 23 is used for the movement of the slider 24, if the drive time of the motor 22 is set to be long, the slider 24 moves too far to the motor 22 side, as if the screw is tightened too much. 23 and the slider 24 are fastened, and a phenomenon that the next locking operation cannot be performed occurs. As shown in FIG. 10, in order to avoid this, the slider 24 is detached from the screw shaft 23 so that the slider 24 idles at the end portion (non-meshing portion 23b) in the axial direction of the screw shaft 23 during the unlocking operation. It has a structure.

  FIG. 10 is an enlarged cross-sectional view of the slider 24 that has moved to the axial end portion (non-meshing portion 23 b) of the screw shaft 23. When the slider 24 moves to the end of the screw shaft 23 in the axial direction, the internal thread of the slider 24 and the external thread of the screw shaft 23 are disengaged, and these are not engaged. In this case, even if the motor 22 is rotated in the unlocking direction, the slider 24 does not move toward the motor 22, and the slider 24 can be stopped at a certain position. Thereby, the fastening of the screw shaft 23 and the slider 24 can be prevented.

  However, even if the slider 24 and the screw shaft 23 are disengaged, it is necessary to reliably return the slider 24 to the screw shaft 23 in order to proceed to the next locking operation. A coil spring 27 is provided between the motor 22 and the slider 24. The coil spring 27 urges the female screw of the slider 24 to the male screw of the screw shaft 23 so that the disengaged slider 24 is returned to the screw shaft 23. For this reason, when the motor 22 rotates in the locking direction, the slider 24 and the screw shaft 23 immediately engage with each other.

  FIG. 11 shows a configuration diagram of a control system using RFID (Radio Frequency IDentification) technology for controlling the electric lock 7. The control system includes a card 41 enclosing an IC chip that stores ID information, an antenna unit 3 that reads and transmits ID information stored in the IC chip, and reads the ID information stored in the IC chip. And a control unit 4 for processing the ID information. When the card 41 is held over the antenna unit, the ID information stored in the IC chip is transmitted to the control unit 4. When the received ID information matches the stored ID information, the control unit 4 unlocks the plurality of electric locks 7 simultaneously. This makes it possible to open the door.

  On the other hand, when the opened door is closed, a reed switch (not shown) detects the closed state of the door. A signal detected by the reed switch is transmitted to the control unit 4. When a signal is transmitted from the reed switch, the control unit 4 rotates the motor 22 of the electric lock 7 in the locking direction to automatically lock the closed door. Thus, when locking, it is not necessary to hold the card 41 over the antenna unit 3, but of course, the card 41 may be locked over the antenna unit 3.

  According to the control system of this embodiment, the locking / unlocking of the plurality of electric locks 7 can be controlled by one antenna unit 3 and one control unit 4. However, if more than the number of electric locks 7 that can be controlled by the control unit 4 is installed in one fixture and it is desired to lock and unlock all the electric locks 7, one control unit 4 cannot cope with it. To solve this, the expansion unit 42 is incorporated into the control system. The external appearance of the expansion unit 42 is the same as that of the control unit, but there is no antenna connection port, and instead a signal input port from the control unit 4 is provided. The output of the control unit 4 uses one place of the connection port of the electric lock 7. Since the extension unit 42 obtains a locking / unlocking signal from the control unit 4, it can be locked / unlocked by the signal of the antenna unit 3 received by the control unit 4. Further, the expansion units 42 can be connected to each other and can be connected in a daisy chain, so that it is theoretically possible to control the unlimited electric lock 7 with the single antenna unit 3.

  The present invention is not limited to being embodied in the above-described embodiment, and can be changed to various embodiments without departing from the gist of the present invention.

  For example, in the above-described embodiment, the linear motion of the slider and the rotational motion of the dead bolt are linked, but the linear motion of the slider and the linear motion of the dead bolt may be linked.

  At the time of unlocking, the dead bolt may not be completely in the case, and may protrude from the case to the extent that it does not hit the door.

  The internal thread of the slider need only be able to mesh with the external thread of the threaded shaft, even if it is not formed as a spiral thread, for example, a pin protruding toward the center of the external thread, or a lead angle direction along the external thread It may be a pin arranged like this.

  In the above embodiment, only one micro switch for detecting the locked state is provided, but two micro switches for detecting the locked state and the unlocked state may be provided.

  In the above embodiment, the control unit uses the RFID technology, but the RFID technology may not be used. The control method of the control unit can be changed as appropriate according to the usage example of the electric lock.

7 ... Electric lock 11 ... Dead bolt 11d ... Stopper part 21 ... Case 21a ... Case body 21b ... Cover 22 ... Motor 23 ... Screw shaft 24 ... Slider 25 ... Rotating shaft 30 ... Slit 26 ... Torsion spring (spring)

Claims (4)

Case and
A motor housed in the case;
A screw shaft coupled to the output shaft of the motor;
A slider having a female screw guided to the case so as to be linearly movable and meshable with the screw shaft;
A dead bolt capable of appearing from the case;
A spring for urging the dead bolt against the slider so that the dead bolt is interlocked with the slider ,
When the motor rotates the screw shaft in one direction around the axis, the slider linearly moves in one direction in the axial direction of the screw shaft, and the dead bolt that contacts the slider protrudes from the case,
An electric lock in which when the motor rotates the screw shaft in the other direction, the slider linearly moves in the other direction of the axial direction of the screw shaft, and the dead bolt that contacts the slider enters the case. The dead bolt is supported by the case so as to be capable of rotating around a rotation axis,
2. The stopper according to claim 1, wherein the dead bolt is provided with a stopper portion that contacts the case so as to restrict the dead bolt that protrudes from the case from rotating further in the protruding direction. The electric lock described. The dead bolt is supported by the case so as to be capable of rotating around a rotation axis and movable in the axial direction of the rotation axis,
The case is formed with a slit for allowing the dead bolt to appear and disappear,
The dead bolt hits a wall surface forming the slit of the case when a load in the center line direction of the rotating shaft acts on the dead bolt in a state of protruding from the slit. The electric lock described. The slider is
An upper surface that contacts the dead bolt in a state of protruding from the case;
A bottom surface sliding on the case,
When a load is applied to the dead bolt protruding from the case, the upper surface of the slider is connected to the screw so as to prevent a load in the axial direction of the screw shaft from acting on the slider from the dead bolt. The electric lock according to any one of claims 1 to 3, wherein the electric lock is parallel to the axis of the shaft.

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