GB741939A - Improvements in or relating to electric timing apparatus - Google Patents
Improvements in or relating to electric timing apparatusInfo
- Publication number
- GB741939A GB741939A GB2664652A GB2664652A GB741939A GB 741939 A GB741939 A GB 741939A GB 2664652 A GB2664652 A GB 2664652A GB 2664652 A GB2664652 A GB 2664652A GB 741939 A GB741939 A GB 741939A
- Authority
- GB
- United Kingdom
- Prior art keywords
- relay
- valve
- winding
- current
- capacitor
- 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
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/28—Modifications for introducing a time delay before switching
- H03K17/288—Modifications for introducing a time delay before switching in tube switches
Abstract
741,939. Valve relay circuits. EXPRESS LIFT CO., Ltd., and YEOMANS, K. A. Oct. 23, 1953 [Oct. 23, 1952], No. 26646/52. Class 40 (6). A timing circuit comprises a relay having a first winding through which a direct current is passed to neutralize the residual magnetism of the relay and a second winding in the anode current path of a normally conducting valve, the timed interval being initiated by connecting the H.T. to the valve whereupon a capacitor in the grid circuit charges or discharges until the anode current is reduced to such a valve that the relay releases. On switching on the H.T. supply to the circuit shown, the relay operates due to the current through winding 16, the current through the second winding 18 being sufficient only to partly neutralize the residual magnetism of the relay. A capacitor 12 between the grid and cathode of the valve charges at first partly through the grid cathode path of the valve and then solely through resistor 13. The grid voltage accordingly slowly falls and when the anode current has decreased sufficiently, the relay releases. The circuit is restored by interrupting the H.T. and, if necessary, discharging the capacitor through a resistor 24. The delay can be varied by adjusting potentiometer 15, capacitor 12 or the current through winding 18. Preferably the relay is such that when both windings are disconnected, it remains operated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2664652A GB741939A (en) | 1952-10-23 | 1952-10-23 | Improvements in or relating to electric timing apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2664652A GB741939A (en) | 1952-10-23 | 1952-10-23 | Improvements in or relating to electric timing apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB741939A true GB741939A (en) | 1955-12-14 |
Family
ID=10246926
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2664652A Expired GB741939A (en) | 1952-10-23 | 1952-10-23 | Improvements in or relating to electric timing apparatus |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB741939A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2965814A (en) * | 1957-05-21 | 1960-12-20 | Zindler Lumoprint Kg | Method of and circuit arrangement for timing photographic and other processes |
-
1952
- 1952-10-23 GB GB2664652A patent/GB741939A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2965814A (en) * | 1957-05-21 | 1960-12-20 | Zindler Lumoprint Kg | Method of and circuit arrangement for timing photographic and other processes |
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