http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-1048627-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_5a44c18dcac9297f41333dfbebff26e9 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/H03K17-292 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/F42B3-10 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/F42D1-05 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/H03K17-292 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/F42D1-05 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/F42B3-10 |
| filingDate | 1963-06-12^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1966-11-16^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-1048627-A |
| titleOfInvention | Improved safety method and safety apparatus applicable to exploders |
| abstract | 1,048,627. Firing circuits for exploders. NOBEL-BOZEL. June 12, 1963 [June 15, 1962], No. 23421/63. Heading H2H. The Specification describes several circuits of the condenser charge-discharge type for firing explosives so arranged that current cannot flow in the firing circuit unless the condenser voltage has reached a predetermined value and that the current flow is of limited predetermined duration. The embodiment shown in Fig. 2 comprises a condenser 4 charged from a D.C. source 1 through a switch 3 and discharged through a firing circuit L via a switch 5 and a controlled rectifier 6 between whose anode and control electrode is connected a series circuit including a neon tube 8, and between whose anode and cathode is connected a circuit including the secondary winding of a transformer 23 whose primary is connected to an RC timing circuit 19, 20 through a gas tube 21. Rectifier 6 will not conduct until the voltage of condenser 4 is sufficient to strike the tube 8. The current in the circuit L, when established, is broken after a predetermined time by flashover of the tube 21 which produces an impulse through members 23, 31 sufficient to stop rectifier 6 conducting. Members 25, 36 protect other parts of the circuit from this impulse. Fig. 3 shows a circuit in which a controlled rectifier 22 is maintained conducting, by a circuit including transistor 27, Zener diode 21 and diode 29, as long as the voltage of condenser 4 is insufficient to strike the tube 8, so that if switch 5 is closed during this condition the line L is short-circuited by the rectifier 22. When tube 8 strikes the rectifier 22 becomes non-conductive for a predetermined time adjustable by an RC circuit 19, 20 connected to members 30, 32, 33, the arrangement being such that the time of current flow may be made independent of the resistance of the firing line. In a third embodiment, Fig. 1 (not shown), two controlled rectifiers are used connected respectively in series and in parallel with the firing line, the series rectifier being controlled by the condenser voltage and the parallel rectifier by an RC timing circuit. Further embodiments are described in which a single series-connected rectifier is controlled by a coldcathode thyratron and a potentiometer, Fig. 4 (not shown), or in which the switch 5 is included in the circuit of the rectifier control electrode, Fig. 5 (not shown). These single series-connected rectifier arrangements may limit the duration of current flow by using a rectifier which automatically cuts off when the voltage of condenser 4 has fallen to a predetermined value. |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-2169460-A http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-4296688-A http://rdf.ncbi.nlm.nih.gov/pubchem/patent/DE-1763057-B1 |
| priorityDate | 1962-06-15^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
| Predicate | Subject |
|---|---|
| isDiscussedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/substance/SID419569943 http://rdf.ncbi.nlm.nih.gov/pubchem/compound/CID23935 |
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