JPH1092270A - Safety device for position switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To guarantee higher coding level than the conventional device, make the forgery of a coded operation member impossible, and remarkably enhance safety against illegality in a safety device for a position switch or the like. SOLUTION: An operation member 8 and a release member 4 are mechanically coded, and by coupling the operation member 8 and the release member 4, mechanical decoding and the mechanical shape coupling between both members 4, 8 are performed. The operation member 8 and the release member 4 are also electronically coded. The release member 4 has an additional electronic write and read device 12, and the operation member 8 has a responder 10. The operation member 8 is programmed when it is coupled with the release member 4 for the first time so that every time these members 4, 8 are coupled, electronic decoding is performed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a safety device for a position switch comprising an operating member and a release member.

[0002]

2. Description of the Prior Art Devices of this kind are known. German Patent No. 4,303,367 shows a safety switch comprising a release mechanism and an operating mechanism for unlocking this mechanism. In this case, the release mechanism basically consists of a roller mounted in the housing, which itself is constituted by a disk with individual radially open radial cam-shaped openings and mounted on one shaft. I have. The operating mechanism is basically key-shaped and has individual operating sections to fit into the openings of the release mechanism. As a result, when the operating mechanism is inserted into the release mechanism, the release mechanism can be released accordingly, so that the electrical switching process is triggered via the rollers.

[0003] Still other mechanically coded safety switches are known. German Patent No. 42 38 016 also discloses such a means. In this case, the key-shaped operating member is inserted into the casing opening of the release device, thereby releasing the lock,
The carriage in the release device can be moved in the insertion direction by the coded operation member, and the operation member is latched in a direction opposite to the insertion direction by the switch tappet of the switch device at the insertion position of the operation member,
Similarly, the switching process is triggered.

[0004] Common to all of these known solutions is that the protection provided against unauthorized switching requires that the operating mechanism and the corresponding release device be more or less easily mechanically coded. It is realized by doing. However, the security achieved in this way is inadequate in many cases. This is because such mechanically coded operating mechanisms are available at specialty stores or can be easily manufactured later. It has been found in practice that such a security device implemented by mechanical coding is relatively easy to fool. And this is a real danger, because it can pass through safety devices such as guard doors, screen grids and covers that would be protected by this type of safety switch. is there.

Further, TEXAS INSTRUMENTS 1991
Year Product Information "REGISTRATIONS- ANDIDENTIFIKATIONSSYS
According to TEMS, a system "TIRIS" for capturing, controlling and monitoring various objects and processes is known, which basically consists of a transponder and a reader and utilizes high-frequency technology. A working system is used, the central component of which is a small, battery-less transponder, each transponder has a unique identification code that cannot be changed, which is pre-programmed on the factory side. The transponder data is captured by a reader, in which case the device emits high frequency pulses which reach and are triggered by the individual transponders. Responds to the signal sent by the device and sends back a unique code.
The read data of the transponder is transmitted to the logic via an appropriate interface and used for further processing. Advantageous fields of application of this system are known for the field of vehicle identification for refuse disposal and fuel emission monitoring, checkout in toll booths, and work flow control in production.

Further, German Utility Model Registration No. 9
According to 203 153, an intelligent safety switch for electrical equipment such as a computer is known. At this time, the safety switch is intended to enable the activation of a computer to which access is granted and the intelligent access control for use of specific software in one step. In this case, a specially configured memory plug module and a socket of a reader sized accordingly are used. The memory module has a special shape for the purpose of mechanical coding and also has a readable EEPROM for the purpose of additional electronic coding. According to such a configuration, the PC user can easily start the PC. Users no longer need to remember long passwords and no more cumbersome manual password entry.

However, such an intelligent safety switch is not suitable for the safety position switch to which the present invention is directed. This is because two-stage release switching, in which two separate decoding steps are triggered by two different decodings, is undesirable and involves contacts such as the intelligent safety switches and chip card systems described above. The system is more subject to wear and, therefore, does not guarantee sufficient operational reliability for equipment whose primary purpose is to protect against others.

[0008]

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a safety device for a position switch or the like which guarantees a coding level which is much higher than that of a conventional device, and prevents forgery of a coded operating member. The aim is to make such devices significantly more secure against tampering.

[0009]

SUMMARY OF THE INVENTION According to the invention, the object is achieved in that the operating member and the release member are mechanically coded and the operating member and the release member are fitted in a defined manner. Decoding and mechanical coupling between these two parts are performed,
The operating member and the release member are also electronically encoded, the release member additionally has an electronic writing and reading device, the operating member has a transponder, The operating member is programmed such that when it first mates with the release member for the first time, the electronic decoding is performed each time the two members are later mated with the operation, and mechanical and electronic decoding is performed. Only when it is done is the electrical switching process triggered to be solved.

[0010]

According to the invention, an electronic coding of the operating member is performed when the operating member and the release member are first brought together in a prescribed manner. Advantageously, this means that only one blank is produced during the production of the operating element, which is programmed so as not to be confused later when the safety device is activated. And this advantage allows both individual parts to be stored separately from each other without sorting, both during manufacture and delivery of the parts and when the customer later processes them. Become like A further advantage is that the operating element and the manufacturing element can be assembled in any combination before the safety device is activated.

[0011] Other advantages of the invention are set forth in the dependent claims and the following description of the embodiments.

[0012]

FIG. 1 shows a perspective view of a partial view of a possible embodiment of the safety device according to the invention.
In this case, the safety device is arranged on the end face of the position switch 2, which is essentially a release member 4 and a key-like actuation that can be inserted into the housing opening 6 of the release member 4, for example, configured as a hopper. And a member 8. As is already known from the cited prior art, the operating member 8 is mechanically coded and can be associated with different release members 4 based on the individual contour of the operating member 8.

As further shown in FIGS. 1-4,
In addition to mechanical safety coding, electronic safety coding is used according to the invention. This electronic coding is realized by two different component units. In this case, the first component unit is embodied as a transponder 10, which is preferably arranged on or integrated in the operating element 8, and the second component unit is a writing and reading device 12 and is preferably integrated in the housing of the release element 4.

In the case of the illustrated embodiment, the transponders 10 are integrated near the center of the key-shaped operation member 8. A write / read device 12 adapted to the position of the transponder 10
Is disposed within the casing of the release member 4 so that the writing / reading device 12 and the transponder 10 can exchange information with the operating member 8 inserted into the release member 4 and form-locked and latched. As a result, contactless information exchange and electronic decoding can be performed. According to the invention, it is provided that the electrical switching process can only be released when both mechanical and electronic decoding are completed in unison.

FIG. 2 is a sectional view showing a state where the safety device according to the present invention is not operated.

FIG. 3 shows a state in which the safety device according to FIG. 2 is operated. It is advantageous here to logically AND the two coding mechanisms, mechanical coding and electronic coding. Such an AND combination can be implemented in various ways. A first possibility is to mechanically implement the AND connection, in which case the transponder 10 and the write / read device 12 are arranged as follows. That is,
Only when the operating member 8 is mechanically latched and at the mechanically decoded final position, the writing / reading device 12 can read the transponder 10. Another possibility is to inquire electronically that the operating member 8 has reached the final position and to activate the writing / reading device 12 depending on the result of the inquiry.

According to the present invention, when the operating member 8 and the release member 4 are initially brought into operation as prescribed, the responder 10 is operated by the writing / reading device 12 by using the corresponding code as follows. Be programmed. That is, each time the two parts 4, 8 are subsequently connected in a defined manner, an enable signal for releasing the electrical switching process is generated. The advantage of this is that it is only necessary to produce a universally usable operating member at the time of manufacture (since it has not yet been programmed). Only when the device is activated does the function of the blank be changed by programming so that a unique operating member 8 is formed. It is advantageous that the programming process can be performed only once, so that any undesired duplicates of the operating member 8 cannot be manufactured.
In this case, the transponder 10 may be configured to be programmed only once, or the write / read device 12 may be configured to be programmed only once.

FIG. 4 shows a schematic diagram of a safety device according to the invention. Advantageously, the operating member 8 is mounted on a support member 13 such as a door, a protective cover or the like,
This is shown as being inserted into the release device 4 and mechanically latched as specified for operation. As shown here, the transponder 10 and the writing / reading device 1
2 are arranged one after the other so that electronic decoding can only be performed after mechanical decoding. In this figure, the device is shown in the decoded ready for operation state. According to the invention, the operating member 8 is such that, when it is removed or disconnected from the support member 13, the information of the transponder 10 required for electronic decoding is erased or locked or becomes unreadable. Is configured. This means, for example, that the operating member 8 and the support member 13 are attached to each other in an electromechanical and / or electromagnetic manner in a mounted state, and when the two members 8 and 13 are separated (removed), the transponder is turned off. This can be realized by erasing or encrypting 10 pieces of programmed information.

FIGS. 5 and 6 show two possible embodiments for this. According to the invention, in the case of such a security device, the transponder 10
Five. Corresponding signals are transmitted to the transponder 10 via the interface 15 depending on the mounting state of the operating member 8 and the supporting member 13, and only when the operating member 8 is mounted on the supporting member 13. The transponder 10 cannot be read by the writing / reading device 12 or cannot communicate with it.

The simplest connection (independent of a separate current supply), since the transponder 10 does not require a specific current supply and is charged as it is activated by a high-frequency signal via the write / read device 12. Can provide a signal from the outside to the transponder 10, and the transponder is switched to the communication enabled mode or the communication disabled mode by this signal.

5 and 6, the interface 1
For example, by interrupting or connecting the connection line 17 to the transponder 10 via the terminal 5, it is notified whether or not the operation member 8 is attached to the support member 13. Then, whether or not the communication with the writing / reading device 12 may be performed is notified to the transponder 10 depending on this information.

In the case of FIG. 5, for example, the completion of the attachment of the operation member 8 to the support member 13 is notified by a predetermined attachment member 19 such as a screw or the like.
The transponder 10 is switched to be readable. According to the embodiment of FIG. 6, such an inquiry is communicated via an operating device 21 additionally provided on the support member 13.
This guarantees that the electronic safety mechanism can only be released when the operating member 8 is in the mounted state.

As shown in FIG. 4, after decoding, an electrical enable signal is generated via the write / read device 12, and this signal is used to release the lock release member 14 such as an electromagnet. Is controlled, whereby the operating mechanism 16 for the electrical switching contact 18 is triggered.

The invention is not limited to the embodiments described, but includes all embodiments which operate in the same way within the framework of the invention. Therefore, it is conceivable to implement the additional inquiry electromagnetically or optically.

[Brief description of the drawings]

FIG. 1 is a partial view showing an embodiment of a safety device according to the present invention in a perspective view.

FIG. 2 is a cross-sectional view of the safety device according to the present invention shown in FIG. 1 when cut in the X and Y directions, which is shown without an operating member inserted.

FIG. 3 shows the sectional view according to FIG. 2 with the operating member inserted;

FIG. 4 is a schematic view of a safety device according to the present invention.

5 shows a part of the safety device according to the invention shown in FIG. 4;

6 shows a part of the safety device according to the invention shown in FIG. 4;

[Explanation of symbols]

 2 Position switch 4 Release member 6 Casing opening 8 Operating member 10 Responder 12 Writing / reading device 13 Supporting member 14 Unlocking member 16 Operating mechanism 18 Switching contact 19 Mounting member 21 Operating device

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Jürgen Volberg Troisdorf Grabenstrasse 25 Germany

Claims (8)

[Claims] 1. A safety device for a position switch comprising an operating member (8) and a release member (4), wherein the operating member (8) and the release member (4) are mechanically coded and their operation is controlled. By the engagement of the member (8) and the release member (4) in accordance with the specified operation, a mechanical decoding and a mechanical shape connection between the two members (4, 8) are performed, and the operating member (8) ) And the release member (4) are also encoded electronically, and said release member (4) additionally has
A read-out device (12), wherein said operating member (8) comprises a transponder (10), said operating member (8) being fitted for the first time with a release member (4) in accordance with the operating rules; , These two members (4,
8) is programmed so that electronic decoding is performed each time the operation is stipulated according to the operating rules, and the electrical switching process is triggered only after mechanical and electronic decoding is performed. And the safety device for the position switch. 2. After the electronic decoding is performed, the release member (4) controls an unlocking member (14) via a trigger signal, and the unlocking member (14) is controlled.
2. The device according to claim 1, wherein the device performs another mechanical unlocking to trigger an electrical switching process. 3. An information exchange between the release member (4) and the operation member (8) is performed by frequency modulation.
The device according to claim 1. 4. The operating member (8) is configured to be programmed only once.
The device according to any one of claims 3 to 7. 5. The writing / reading device (12)
5. The device according to claim 1, wherein the device is configured such that the programming process can only be performed once for coding the operating element. 8. 6. A transponder (10) arranged on the operating member (8) has an interface (15),
The interface (15) receives a signal via the connection line (17) when the operation member (8) is attached to the support member (13), and the operation member (8) receives the signal from the support member (13). Connection line when disconnected (17)
6. The device according to any one of the preceding claims, wherein the device is shut off or closed. 7. The device according to claim 1, wherein the connecting line is closed or closed by removing a mounting member. 8. The operating device (2), wherein the support member (13) is
7. The connecting device according to claim 6, wherein the operating device (21) opens or closes the connecting line (17) with the operating member (8) attached to the support member (13). Equipment.