http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-774228-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_5c87853c7ed8d4f70ce17e08924a880e |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/H01H33-002 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C25B15-00 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/H01H33-00 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C25B15-00 |
| filingDate | 1955-01-31^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1957-05-08^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-774228-A |
| titleOfInvention | Improvements in or relating to arrangements for controlling switches or contacts forcurrents of high strength |
| abstract | 774,228. Switching systems. UHDE GES., F. Jan. 31, 1955 [Jan. 29, 1954], No. 2887/55. Class 38 (4). A switch 3, having main contacts 2 for shortcircuiting an electrolysis cell upon failure of the supply to an electric motor 45 driving a conveyer 46 for circulating mercury in the cell, is actuated by a compressed air servomotor 12 controlled through a main valve 14 and pilot valve 34 from a " no-volt " relay 49 energized from the motor terminals and provided with change-over contacts. These contacts control, respectively, the energization of a winding 36 for actuating pilot valve 34 and a winding 56 for releasing a locking device 4, 5 by which the switch is held closed, the relay contacts also being in series with auxiliary contacts 58, 62, respectively actuated by the switch 3. The switch also operates a further contact 95 controlling lamps 96, 97 for indicating the condition of the switch. Under normal conditions the relay contacts, the valves and servomotor piston and in the positions shown. Upon de-energization of relay 49, winding 36 is energized over contacts 60, 62 and operates the pilot valve 34 which admits compressed air from a reservoir 19 to a space 37 about the conical head 16 of inain valve 14 (vented to the atmosphere on its lower face through a valve 41 held open by a cam 43 on the piston rod 7 of the servomotor). The main valve is thus caused to descend in its cylinder to close an exhaust port 30 for the servomotor, to which air is now admitted through pipe 13. The piston of the servomotor operates the switch 3 which latches in by the device 4, 5, prepares a circuit for the release winding 56 at contact 58 and opens contact 62 to de-energize winding 36. Cam 43 allows valve 41 to close at the end of the stroke of the servomotor so that the air pressures on the two sides of the main valve 14 equalize and the valve closes under the action of a spring 17. When the service to motor 45 is restored, relay 49 reverts to its initial condition so that winding 56 is energized over contacts 53, 58 to release the locking device 4, 5. The switch 3 thus opens under the action of a spring 94, whilst a spring 11 returns the servomotor to its initial position. |
| priorityDate | 1954-01-29^^<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/SID419556032 http://rdf.ncbi.nlm.nih.gov/pubchem/compound/CID23931 |
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