GB487563A - Improvements in circuit arrangements adapted to produce electric current impulses ofpredetermined duration - Google Patents
Improvements in circuit arrangements adapted to produce electric current impulses ofpredetermined durationInfo
- Publication number
- GB487563A GB487563A GB25737/37A GB2573737A GB487563A GB 487563 A GB487563 A GB 487563A GB 25737/37 A GB25737/37 A GB 25737/37A GB 2573737 A GB2573737 A GB 2573737A GB 487563 A GB487563 A GB 487563A
- Authority
- GB
- United Kingdom
- Prior art keywords
- resistance
- relay
- switch
- circuit
- ofpredetermined
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M19/00—Current supply arrangements for telephone systems
- H04M19/02—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Relay Circuits (AREA)
Abstract
487,563. Electromagnetic relays. BRITISH THOMSON-HOUSTON CO., Ltd. Sept. 22, 1937, No. 25737. Convention date, Sept. 25, 1936. [Class 38 (v)] When a switch 16 is closed, a circuit is completed to a resistance 18 which changes its resistance as it becomes hot thereby increasing the voltage applied to a relay 17 with the consequent actuation of the relay a predetermined time after the closure of the switch 16. The invention is shown applied to a spotwelding system, the bringing of the electrodes into contact with the work serving to close the switch 16 and thereby complete a circuit 23, 24, 25, 26 to the primary of a transformer 11, the secondary of which supplies current to the electrodes 10. The resistance 18 and relay 17 are arranged as shown, and the increase of the resistance 18 with rise of temperature causes a drop of potential across an adjustable resistance 19 and a consequent increase of potential across the relay 17. The relay 17 thereupon attracts its armature 20 which by impact opens contacts 14 and breaks the transformer circuit. In a modification, Fig. 2 (not shown), the resistance 18 has a negative temperature coefficient. The resistances 18 may be lamps with tungsten or carbon filaments or they may be of molybdenum or tantalum.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US487563XA | 1936-09-25 | 1936-09-25 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB487563A true GB487563A (en) | 1938-06-22 |
Family
ID=21956286
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB25737/37A Expired GB487563A (en) | 1936-09-25 | 1937-09-22 | Improvements in circuit arrangements adapted to produce electric current impulses ofpredetermined duration |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB487563A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2794896A (en) * | 1953-06-25 | 1957-06-04 | Knapp Monarch Co | Temperature compensated control mechanism for electric blanket |
-
1937
- 1937-09-22 GB GB25737/37A patent/GB487563A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2794896A (en) * | 1953-06-25 | 1957-06-04 | Knapp Monarch Co | Temperature compensated control mechanism for electric blanket |
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