DE839219C - Safety circuit for switching on, in particular, pressing and punching by simultaneously operating two push-button switches - Google Patents
Safety circuit for switching on, in particular, pressing and punching by simultaneously operating two push-button switchesInfo
- Publication number
- DE839219C DE839219C DEB2850A DEB0002850A DE839219C DE 839219 C DE839219 C DE 839219C DE B2850 A DEB2850 A DE B2850A DE B0002850 A DEB0002850 A DE B0002850A DE 839219 C DE839219 C DE 839219C
- Authority
- DE
- Germany
- Prior art keywords
- push
- switch
- contactor
- contacts
- pressing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16P—SAFETY DEVICES IN GENERAL; SAFETY DEVICES FOR PRESSES
- F16P3/00—Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body
- F16P3/18—Control arrangements requiring the use of both hands
- F16P3/20—Control arrangements requiring the use of both hands for electric control systems
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Push-Button Switches (AREA)
- Keying Circuit Devices (AREA)
Description
Um das Auftreten von Unfällen beim Einschalten schwerer Werkzeugmaschinen, insbesondere von Pressen oder Stanzen zu verhüten, sind Zweihandschaltungen bekannt, die zwangsläufig die gleichzeitige Bedienung von zwei im Einschaltstromkreis liegenden Druckknopfschaltern erfordern, so daß keine Hand für Handihabungen im Be,#vegungsbereich der Preß- oder Stanz@verkzeuge frei ist. Trotz dieser Maßnahme wird von den Bedienenden häufig versucht, derartige Maschinen mit nur einer Hand in Betrieb zu sehen, indem der eine Schalter durch Festklemmen des Knopfes oder der Kontakte in Einschaltstellung gehalten wird.To prevent accidents when turning on heavy machine tools, to prevent in particular from pressing or punching, two-hand circuits are known, inevitably the simultaneous operation of two lying in the switch-on circuit Require push-button switches, so that no hand for handling in the loading, # vegungsbereich the pressing or punching tool is free. Despite this measure, the operator often tries to see such machines in operation with just one hand by one switch by clamping the button or the contacts in the on position is held.
Die Schaltung nach der Erfindung will eine Umgehung der getroffenen Sicherheitsmaßnahmen dadurch verhindern, daß bei Bedienung nur eines Knopfes in jedem Falle ein Einschalten der Anlage unmöglich gemacht wird, und zwar insbesondere auch dann, wenn der andere Knopf in Dauerkontaktstellung steht. Zu diesem Zweck ist gemäß der Erfindung ein Zeitschlitz und ein Hilfsschütz je in Reihe mit den gleichzeitig geschlossenen Ausschaltkontakten und den gleichzeitig zu schließenden Einschaltkontakten der beiden Druckknopfschalter angeordnet. Es wird dadurch erreicht, daß der Verzögerungskontakt des Zeitschützes. der ebenfalls in Reihe mit den Einschaltkontakten liegt, durch vorzeitigen Albfall des Hilfsschützes einen zu den Ausschaltkontakten parallel liegenden Kontakt unterbricht und damit das Einschalten des Einschaltorgans verhindert.The circuit according to the invention aims to circumvent the struck Prevent safety measures by using only one button in In any case, switching on the system is made impossible, in particular even if the other button is in permanent contact position. To this end is according to the invention a time slot and an auxiliary contactor each in series with the switch-off contacts closed at the same time and those to be closed at the same time Switch-on contacts of the two push-button switches arranged. It is achieved by that the delay contact of the time contactor. which is also in series with the switch-on contacts is due to a premature failure of the auxiliary contactor to the switch-off contacts The parallel contact interrupts and thus the switching on of the switching element prevented.
Dieses kann eine ':%fagnetkupplung. ein Steuerventil oder ein anderes Einschaltgerät sein.This can be a ':% magnetic clutch. a control valve or another Be a switch-on device.
Die Zeichnung veranschaulicht den Gegenstand der Erfindung am Ausführungsbeispiel einer Schaltanordnung, hei der außer dem Zeitschütz i ein Hilfsrelais 2 verwendet wird.The drawing illustrates the subject matter of the invention using the exemplary embodiment a switching arrangement that uses an auxiliary relay 2 in addition to the time contactor i will.
Das Verzögerungsrelais besitzt einen abfallverzögerten Kontakt 3 mit sehr kurzer Abfallzeit von etwa einer halben Sekunde. Das Hilfsschütz ist mit einem einfachen Kontakt 4 versehen. Die beiden Schütze liegen parallel zueinander an .der Spannung der Einschaft- und Steuerleitung 5, 6, in der sich auch der Einschalter 7 befindet. In den Steuerleitungen befinden sich die Druckknöpfe 8, 9 mit in Ausschaltstellung geschlossenen Kontaktelf i o. i i und Einschaltkontakten 12, 13.The delay relay has a drop-out delayed contact 3 with very short fall time of about half a second. The auxiliary contactor is with a simple contact 4 provided. The two contactors are parallel to each other Voltage of the unit and control line 5, 6, in which the on / off switch is also located 7 is located. The push buttons 8, 9 in the control lines are also in the switch-off position closed contact elf i o. i i and switch-on contacts 12, 13.
Wird der Schalter 7 geschlossen, so spricht normalerweise über die Kontakte io, i i das Zeitschütz i an und schließt sofort seinen Verzögerungskontakt 3. Dieser Einschaltzustand bleibt so lange aufrechterhalten, bis beide Druckknöpfe 8, 9 gleichzeitig gedrückt werden, wodurch sich die Kontakte i o, i i öffnen und die Kontakte 12, 13 schließen. In diesem Augenblick wird der Stromkreis für das Schütz i unterbrochen und der Stromkreis für Idas Schütz 2 geschlossen. Das Schütz 2 schließt einen Kontakt 4, der die Kontakte io, i i überbrückt, so ,daß das Zeitschütz nicht abfallen kann und der Einschaltzustand für die Dauer der Druckknopfbetätigung erhalten bleibt, bis die Maschine in Gang gesetzt ist.If the switch 7 is closed, it normally speaks about the Contacts io, i i connect the time contactor i and immediately closes its delay contact 3. This power-on state is maintained until both push buttons 8, 9 are pressed simultaneously, whereby the contacts i o, i i open and contacts 12, 13 close. At that moment the circuit for that Contactor i interrupted and the circuit for Ida's contactor 2 is closed. The contactor 2 closes a contact 4, which bridges the contacts io, i i, so that the time contactor cannot drop out and the switch-on state for the duration of the pushbutton actuation remains until the machine is started.
Ist dagegen beispielsweise der Druckknopf 9 festgeklemmt, so daß der Kontakt i i geöffnet ist, so kann das Zeitschütz überhaupt nicht ansprechen und auch beim Drücken des anderen Druckknopfes der Stromkreis über das Hilfsschütz trotz der geschlossenenKontakte -12, 13 nicht zustande kommen.If, however, for example, the push button 9 is clamped so that the Contact i i is open, the time contactor cannot respond at all and even when pressing the other push button the circuit via the contactor relay despite the closed contacts -12, 13 do not come about.
Werden beide Druckknöpfe 8, 9 in .gewissem zeitlichen Abstand voneinander gedrückt, so spricht das Schütz i zwar an, jedoch fällt sein Verzögerungskontakt in der Zwischenzeit ab, so daß das Hilfsschütz den Haltestromkreis für das Zeitschütz nicht schließen kann, wodurch ebenfalls ein Einschalten der Anlage verhindert wird. Dieser Zeitkontakt kann statt im Stromkreis eines Hilfsschützes auch unmittelbar im Stromkreis der Kuppeleinrichtung für die Maschine angeordnet sein, so daß bei 'licht gleichzeitigem Drücken der Knöpfe 8, 9 der Einschaltstromkreis für die Einschaltvorrichtung unmittelbar unterbrochen wird. Auf diese Weise kann das Hilfsschütz erspart werden.If both push buttons 8, 9 are at a certain time interval from one another is pressed, contactor i responds, but its delay contact drops in the meantime, so that the auxiliary contactor the holding circuit for the time contactor cannot close, which also prevents the system from being switched on. This time contact can also be used directly instead of in the circuit of an auxiliary contactor be arranged in the circuit of the coupling device for the machine, so that at 'Light simultaneous pressing of buttons 8, 9 of the switch-on circuit for the switch-on device is immediately interrupted. In this way, the auxiliary contactor can be saved.
Claims (2)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEB2850A DE839219C (en) | 1950-03-31 | 1950-03-31 | Safety circuit for switching on, in particular, pressing and punching by simultaneously operating two push-button switches |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEB2850A DE839219C (en) | 1950-03-31 | 1950-03-31 | Safety circuit for switching on, in particular, pressing and punching by simultaneously operating two push-button switches |
Publications (1)
Publication Number | Publication Date |
---|---|
DE839219C true DE839219C (en) | 1952-05-19 |
Family
ID=6952939
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEB2850A Expired DE839219C (en) | 1950-03-31 | 1950-03-31 | Safety circuit for switching on, in particular, pressing and punching by simultaneously operating two push-button switches |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE839219C (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1127995B (en) * | 1958-02-08 | 1962-04-19 | Atomic Energy Authority Uk | Arrangement for controlling an electrical load by actuating two switches both in a predetermined order and at a predetermined time interval |
DE1143264B (en) * | 1952-08-01 | 1963-02-07 | Renault | Safety circuit for hand-controlled machines |
DE1155842B (en) * | 1958-08-16 | 1963-10-17 | Siemens Ag | Arrangement for giving electrical commands to electrically controllable switches by means of several independent but cooperating command transmitters |
DE1225748B (en) * | 1958-09-04 | 1966-09-29 | Siemens Ag | Arrangement for reporting the switch position of a multi-pole switch with only one signaling switch |
DE1238557B (en) * | 1958-12-10 | 1967-04-13 | Lars Erik Svensson | Electric two-hand safety circuit for switching on working machines with reciprocating parts |
DE1266860B (en) * | 1961-01-21 | 1968-04-25 | Metallwaren Und Maschinenfabri | Safety circuit for switching on presses, punching or the like. |
DE1266861B (en) * | 1963-01-22 | 1968-04-25 | Siemens Ag | Electrical safety circuit for the two-hand indentation of presses, punching machines and similar machine tools |
-
1950
- 1950-03-31 DE DEB2850A patent/DE839219C/en not_active Expired
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1143264B (en) * | 1952-08-01 | 1963-02-07 | Renault | Safety circuit for hand-controlled machines |
DE1127995B (en) * | 1958-02-08 | 1962-04-19 | Atomic Energy Authority Uk | Arrangement for controlling an electrical load by actuating two switches both in a predetermined order and at a predetermined time interval |
DE1155842B (en) * | 1958-08-16 | 1963-10-17 | Siemens Ag | Arrangement for giving electrical commands to electrically controllable switches by means of several independent but cooperating command transmitters |
DE1225748B (en) * | 1958-09-04 | 1966-09-29 | Siemens Ag | Arrangement for reporting the switch position of a multi-pole switch with only one signaling switch |
DE1238557B (en) * | 1958-12-10 | 1967-04-13 | Lars Erik Svensson | Electric two-hand safety circuit for switching on working machines with reciprocating parts |
DE1266860B (en) * | 1961-01-21 | 1968-04-25 | Metallwaren Und Maschinenfabri | Safety circuit for switching on presses, punching or the like. |
DE1266861B (en) * | 1963-01-22 | 1968-04-25 | Siemens Ag | Electrical safety circuit for the two-hand indentation of presses, punching machines and similar machine tools |
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