JP2009007771A - Door switch system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a small-sized door switch system with high durability, which can be hardly disabled. <P>SOLUTION: A dead bolt 12, which is attached to a door 1 in such a manner as to freely protrude from/recede into it, makes an entry into a retainer fitting 20 which is embedded in a door frame 2, so that a door system can be locked. The door switch system detects the locked state of the door system. Either of the dead bolt 12 and the retainer fitting 20 is equipped with a magnet 13, and the other one is equipped with a magnetic sensor 21 which detects a magnet field expected when the dead bolt 12 makes an entry into the retainer fitting 20, without coming into contact with the magnet 13. The door switch system can also be equipped with a wireless ID tag and a wireless ID tag reader in place of the magnet 13 and the magnetic sensor 21. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a door switch system that detects a locked state of a door system, and more particularly, to a technique that realizes a door switch system that is small, highly durable, and difficult to invalidate.

  Conventionally, various door switch systems for detecting a locked state of a door system and applications thereof have been proposed and put into practical use.

  For example, as a first prior art, a key switch is known in which a micro switch is provided in a strike box, and a dead bolt presses the micro switch to turn off the room lighting.

  According to this key switch, the interior lighting can be automatically turned off and on in conjunction with the locking and unlocking of the door, eliminating the inconvenience of forgetting to turn off the interior lighting and searching for the switch in the dark for lighting. The

  In addition, as a second prior art, a switching device provided with a reed switch on one side of a door lock attached to a door and a seat attached to a frame or the like and a permanent magnet on the other side, which is made of a non-magnetic material. There is known a switching device in which an intermediate member made of a material having high magnetic permeability such as iron is provided on a part of the door lock and the front plate of the seat.

  According to this switching device, when detection is performed using magnetic force, the magnetic force lines can be efficiently guided to the reed switch by concentrating the magnetic force lines on the intermediate member.

The door switch system can also be applied to an interlock system.
Patent Document 1 discloses an example of a picking device including an interlock system. The interlock system disclosed in Patent Document 1 is provided with a human body sensor that detects a person who has entered the safety fence in a picking apparatus surrounded by a safety fence, and the picking apparatus detects the person when the human body sensor detects a person. Emergency stop the device.

  For example, in this interlock system, the locking state of the door part of the safety fence is detected by a door switch system, and when the locking state is not detected, the picking device can be emergency stopped to further improve safety. it can.

  When a door switch system is used for an interlock system, it is required that invalidation is difficult. Disabling here means that an operator who intends to illegally omit the overhead required for safety causes the door switch system to falsely detect the locked state when the door system is not actually locked. is there.

  Therefore, as a third conventional technique, a door switch system configured to be difficult to invalidate is commercially available.

FIG. 6 is a block diagram showing a typical example of such a door switch system.
The door switch system shown in FIG. 6 is composed of a lock main body 91 and a receiving bracket 92 that are respectively attached to one and the other of the door and the door frame. When locking, a slide key 93 having a predetermined shape is slid. It protrudes from the lock main body 91 together with the protective metal fitting 94 for preventing the key 93 from being broken, and enters the receiving metal piece 92. Then, the locking state is detected by fitting the slide key 93 with the sensor switch 95 provided in the receiving metal fitting 92.

According to this door switch system, since the lock state is not detected unless the slide key 93 having a predetermined shape and the sensor switch 95 are fitted, it cannot be easily invalidated even if a common member is inserted into the metal fitting 92. .
Japanese Patent Laid-Open No. 2002-370806

  However, according to the conventional technology, there is a problem that it is difficult to realize a door switch system that is small, highly durable, and difficult to disable.

  The key switch of the first prior art can be realized so small as to be embedded in the engraved lock, but can be easily invalidated simply by pressing the microswitch with a common member. Moreover, since a mechanical microswitch is used, it is inferior in durability.

  Since the second prior art switching device detects the locked state using a permanent magnet and a reed switch, it is considered that it has good durability and is relatively difficult to invalidate. This requires a space for providing an intermediate member, which is disadvantageous in terms of miniaturization.

  According to the third conventional door switch system, it is difficult to invalidate, but it is disadvantageous in terms of miniaturization because it includes a relatively large protective metal fitting for protecting the slide key. In addition, it is not necessarily preferable that the door switch system is installed in an exposed state due to imposition because the design is limited or from the viewpoint of security.

  The present invention has been made in view of such circumstances, and an object thereof is to provide a door switch system that is small in size, high in durability, and difficult to invalidate.

  In order to solve the above problem, the door switch system of the present invention is a door switch system that detects a locked state of a door system that is locked when a movable member that is removably attached to the door enters the door frame. One of the movable member and the door frame is provided with a detected object that changes the surrounding electromagnetic field, and the other is an electromagnetic field that is expected when the movable member enters the door frame. A detector for detecting without contacting the detected object is provided.

  According to this configuration, one of the detected body and the detector is provided on a movable member for exhibiting a locking function such as a dead bolt, so that a part of the front surface of the key body or the receiving metal is detected. Or it is not occupied by the detector, which helps to miniaturize the door switch system. In addition, since the other of the detected object and the detector is provided in the door frame, it can be applied to the engraved lock, thereby eliminating the design and security disadvantages of conventional imposition.

  Furthermore, since the locked state is detected by detecting the expected predetermined electromagnetic field, the locked state is not detected even if a common member is brought close to the detector, and invalidation is difficult. And since a locked state is detected by non-contact, durability is also high.

  The detected object may be a wireless tag, and the detector may be a wireless tag reader.

  According to this configuration, the locked state is not detected unless a change in the electromagnetic field generated according to the characteristics of the predetermined wireless tag is detected. Desirably, if the wireless tag is a wireless ID tag, the locked state is not detected unless a predetermined ID is read, so that invalidation can be prevented extremely firmly.

  The detected object may be a magnet, and the detector may be a magnetic sensor. Preferably, the magnet is a magnet array in which a plurality of magnet pieces are arranged in a predetermined magnetic polarity order, and the magnetic sensor has a plurality of magnetic sensors that can individually detect a magnetic field direction. It may be a magnetic sensor array.

  According to this configuration, for example, it becomes impossible to invalidate the micro switch by mechanical pressing, which has been possible in the past, so that a certain effect can be obtained in preventing the invalidation. In particular, according to the configuration for detecting the magnetic pole arrangement of the magnet array, the locked state is not detected only by bringing a single-pole magnet closer, and invalidation can be prevented more reliably.

  The present invention can be realized not only as such a door switch system but also as an interlock system using such a door switch system. Furthermore, it can be realized as an automatic warehouse or machine tool having an emergency stop function by such an interlock system.

  As described above, according to the door switch system of the present invention, by providing one of the detected body and the detector on the movable member, a part of the front surface of the key body portion or the receiving bracket is detected body. Or it is not occupied by the detector, which helps to miniaturize the door switch system. In addition, since the other of the detected object and the detector is provided in the door frame, it can be applied to the engraved lock, thereby eliminating the design and security disadvantages of conventional imposition.

  Further, since the locked state is detected by a predetermined expected electromagnetic field, the locked state is not detected even if a common member is brought close to the detector, and therefore invalidation is difficult. And since a locked state is detected by non-contact, durability is also high.

  A door switch system according to an embodiment of the present invention will be described in detail with reference to the drawings.

  FIG. 1A is a configuration diagram illustrating an example of a door switch system according to an embodiment, together with a hinged door system to which the door switch system is applied.

  This hinged door system includes a door 1 and a door frame 2, and can be locked using a key main body 10 embedded in the door 1 and a receiving metal 20 embedded in the door frame 2.

  The key body portion 10 is urged and folded in the direction of advancing from the front surface 17 by a dead bolt 12 protruding and retracting from the front surface 17 of the key body portion 10 by the rotational force applied to the key inserted into the key cylinder 11. A latch bolt 19 is provided that is pulled into the key body 10 by turning force applied to the knob 18.

  Here, the dead bolt 12 is an example of the movable member described in the claims. Further, the latch bolt 19 may be included in the movable member.

  A hole for receiving the dead bolt 12 and the latch bolt 19 is provided in the front surface 27 of the receiving metal 20. When the dead bolt 12 and the latch bolt 19 enter the receiving metal 20 through the hole and engage with the receiving metal 20, locking and temporary fastening are performed, respectively.

Since such a structure for locking is well known, further detailed description is omitted.
Next, a configuration for detecting the locked state, which is characteristic of the door switch system in the embodiment, will be described.

  This door switch system includes a magnet 13 attached to the dead bolt 12 and a magnetic sensor 21 attached to the receiving bracket 20. Here, the magnet 13 is an example of an object to be detected described in the claims, and the magnetic sensor 21 is an example of a detector described in the claims.

  The magnet 13 is a known permanent magnet such as an alnico magnet, a ferrite magnet, or a rare earth magnet. The magnetic sensor 21 is a sensor that converts a magnetic field strength into an electric signal using a known element such as a Hall element or a magnetoresistive element.

  FIG. 1B is an enlarged view for explaining an example of a state in which the magnet 13 is attached to the dead bolt 12. As seen in the figure, the magnet 13 may be fitted into a notch provided at the tip of the dead bolt 12 and screwed.

  The attachment of the magnet 13 to such a position of the dead bolt 12 is possible even in the locked state or when the dead bolt 12 accidentally advanced with the door 1 opened is abutted against the metal fitting 20. Is not directly in contact with the metal fitting 20, which is advantageous for realizing a door switch system with excellent durability.

  As the dead bolt 12 moves, the magnet 13 approaches the magnetic sensor 21 and moves backward along the chain line shown in FIG.

  The magnetic sensor 21 determines each magnetic field expected from the difference in the position of the magnet 13 when the dead bolt 12 enters the receiving bracket 20 (that is, inside the door frame 2) and when the dead bolt 12 exits. To detect.

  Then, when a magnetic field expected when the dead bolt 12 enters the receiving metal fitting 20 is detected, a locking signal indicating a locked state is output to the signal line 29. Further, when such a magnetic field is not detected, the output of the locking signal is stopped assuming that the dead bolt 12 has left the receiving bracket 20.

  According to the configuration described above, the front surface 17 and a part of the front surface 27 are not occupied by the magnet 13 and the magnetic sensor 21, which is useful for reducing the size of the door switch system. Moreover, since the magnetic sensor 21 is provided in the metal fitting 20, it can be applied to the engraved lock, so that disadvantages in terms of design and security due to conventional imposition are eliminated.

  Furthermore, since the locked state is magnetically detected, it becomes impossible to invalidate the microswitch by mechanical pressing, which was possible with one of the conventional techniques, and a certain effect can be obtained in preventing the invalidation. And since a locked state is detected by non-contact, durability is also high.

  The magnet 13 may be attached to the metal fitting 20 and the magnetic sensor 21 may be attached to the dead bolt 12. Further, the magnet 13 may be attached to the latch bolt 19, and the magnetic sensor 21 may be attached to a position facing the latch bolt 19 in the receiving metal 20. A door switch system configured as such is also included in the present invention.

  Further, a known configuration necessary for the operation of the magnetic sensor 21 such as an amplifier or a transceiver for amplifying a signal from the magnetic sensor 21 or a controller for controlling the magnetic sensor 21 may be appropriately connected to the signal line 29. .

  Next, a modified example of the door switch system that can prevent invalidation more reliably will be described.

FIG. 2 is a configuration diagram showing an example of a door switch system in this modification.
In this door switch system, the magnet 13 of the door switch system shown in FIG. 1A is changed to a magnet array 14 in which a plurality of magnet pieces are arranged in a predetermined magnetic polarity sequence, and the magnetic sensor 21 is It is configured by changing to a magnetic sensor array 22 formed by arranging a plurality of magnetic sensors capable of individually detecting the magnetic field direction.

  The magnet array 14 can be manufactured, for example, by attaching a plurality of alnico magnet pieces, a plurality of ferrite magnet pieces, a plurality of rare earth magnet pieces, and the like to a base made of a non-magnetic material in a predetermined magnetic polarity order. Further, the magnetic sensor array 22 can be manufactured by arranging a plurality of Hall elements in parallel at positions facing the magnet pieces, for example. In this case, a Hall element that can detect the magnetic field direction is suitable.

  According to the configuration described above, the locked state is not detected unless the predetermined magnetic polarity order is detected. For example, the locked state is not detected only by bringing a single-pole magnet closer, and invalidation can be prevented more reliably. A door switch system is realized.

  Next, a modification of the door switch system that can prevent invalidation firmly will be described.

FIG. 3 is a block diagram showing an example of a door switch system in this modification.
This door switch system is configured by changing the magnet 13 of the door switch system shown in FIG. 1A to a wireless ID tag 15 and changing the magnetic sensor 21 to a wireless ID tag reader 23.

  As the wireless ID tag 15, a read-only tag indicating a unique ID code can be used. In addition, when the intensity of the radio wave for reading emitted from the wireless ID tag reader 23 is appropriately adjusted so that the ID code is read only at the position of the wireless ID tag 15 when the dead bolt 12 enters the receiving bracket 20. To do.

  According to the configuration described above, since the locked state is not detected unless a predetermined ID code is read, a door switch system that can prevent invalidation extremely firmly is realized.

  Instead of the wireless ID tag 15, a simple wireless tag that absorbs electromagnetic waves having a specific frequency by resonance may be used. In this case, the wireless tag reader can detect the locked state by detecting the attenuation of the electromagnetic field of a specific frequency that is expected when the wireless tag has entered the metal fitting 20.

  In addition to a magnet and a wireless tag, it is also possible to use a detection object that forms a specific capacitance with the detector when entering the receiving metal fitting 20. In that case, the locked state can be detected by detecting the specific capacitance using a capacitance sensor as a detector.

  Next, an automatic warehouse in which the door switch system described above is applied to an interlock system will be described.

FIG. 4 is a conceptual diagram showing an example of the configuration of such an automatic warehouse 3.
As an example, the automatic warehouse 3 is provided in one lockable room or building. In the locked interior, the stacker crane 4 is operated unattended under the control of the control device 41. An operator enters and exits the automatic warehouse 3 from the door 1 while the stacker crane 4 is stopped for safety.

  The door 1 and the door frame 2 are each provided with a key main body 10 and a metal fitting 20 each having the door switch system described above. The door switch system is used in an interlock system for emergency stop of the stacker crane 4.

  The detector provided in the metal fitting 20 outputs a locking signal to the control device 41 through the signal line 29 while the locking state is detected. The control device 41 normally controls the stacker crane 4 as long as this locking signal is given.

  When the locked state is no longer detected, the detector stops outputting the locking signal. The control device 41 makes the stacker crane 4 perform an emergency stop when the locking signal is interrupted.

  According to this configuration, since it is difficult to invalidate the door switch system, the worker cannot illegally omit the overhead necessary for safety, and as a result, the worker's safety can be kept good. .

  Of course, such an interlock system can be applied to other than automatic warehouses. For example, in a room or a building in which a machine tool that can be a danger source is automatically operated, the machine tool can be used to make an emergency stop when an entrance lock is not detected.

Next, a modified example of the door switch system suitable for the sliding door system will be described.
FIG. 5 is a configuration diagram showing an example of a door switch system in this modification.

  This door switch system is configured by changing the dead bolt 12 shown in FIG. 1A to the flange member 16 and changing the shape of the hole in the front surface 27 of the metal fitting 20. The latch bolt 19 and the folding knob 18 are omitted.

  The eaves member 16 is rotatably attached to the key body 10 and protrudes and retracts from the front surface 17 of the key body 10 by turning force applied to the key inserted into the key cylinder 11. Locking is performed by the flange member 16 entering the receiving metal 20 through the hole provided in the front surface 27 and engaging with the receiving metal 20.

  The flange member 16 is provided with a magnet 13 at a position facing the magnetic sensor 21 in a locked state. The magnet 13 approaches the magnetic sensor 21 and retreats along the chain line shown in FIG.

  The magnetic sensor 21 detects the locked state by detecting each magnetic field expected from the difference in the position of the magnet 13 depending on whether the flange member 16 has entered the receiving bracket 20 or has exited. To detect.

  According to the configuration described above, it is possible to obtain a door switch system that is compatible with the sliding door system by using the gutter member 16, and that is small, durable, and difficult to invalidate, as described above.

  The door switch system according to the present invention can be widely used in a control system that detects a locked state of a door and performs predetermined control, such as an automatic warehouse or an interlock system of a machine tool.

(A) The block diagram which shows an example of the door switch system in embodiment, (B) The enlarged view explaining an example of the attachment state to the dead bolt of a magnet Configuration diagram showing a modification of the door switch system The block diagram which shows the other modification of a door switch system Conceptual diagram showing a configuration example of an automatic warehouse using a door switch system Configuration diagram showing a modification of a door switch system suitable for a sliding door system Configuration diagram showing a typical example of a conventional door switch system to be impositioned

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Door 2 Door frame 3 Automatic warehouse 4 Stacker crane 10 Key body part 11 Key cylinder 12 Dead bolt 13 Magnet 14 Magnet array 15 Wireless ID tag 16 Girder member 17 Front surface 18 Folding knob 19 Latch bolt 20 Receptacle 21 Magnetic sensor 22 Magnetic Sensor array 23 Wireless ID tag reader 27 Front surface 29 Signal line 41 Control device 91 Lock body 92 Receiving bracket 93 Slide key 94 Protective bracket 95 Sensor switch

Claims (4)

A door switch system that detects a locked state of a door system that is locked when a movable member that is removably attached to the door enters the door frame,
One of the movable member and the door frame is provided with a detected object that changes the surrounding electromagnetic field,
On the other hand, a door switch system comprising: a detector that detects an electromagnetic field expected when the movable member enters the door frame without contacting the detected object. The detected object is a wireless tag;
The door switch system according to claim 1, wherein the detector is a wireless tag reader. The detected object is a magnet,
The door switch system according to claim 1, wherein the detector is a magnetic sensor. The magnet is a magnet array in which a plurality of magnet pieces are arranged in a predetermined magnetic polarity order,
The door switch system according to claim 3, wherein the magnetic sensor is a magnetic sensor array in which a plurality of magnetic sensors capable of individually detecting a magnetic field direction are arranged.

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