GB392928A - Improvements in or relating to time lag devices - Google Patents
Improvements in or relating to time lag devicesInfo
- Publication number
- GB392928A GB392928A GB3241131A GB3241131A GB392928A GB 392928 A GB392928 A GB 392928A GB 3241131 A GB3241131 A GB 3241131A GB 3241131 A GB3241131 A GB 3241131A GB 392928 A GB392928 A GB 392928A
- Authority
- GB
- United Kingdom
- Prior art keywords
- condenser
- cell
- charge
- door
- grid
- 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
Landscapes
- Power-Operated Mechanisms For Wings (AREA)
Abstract
392,928. Valve circuits. LYONS & CO., Ltd., J., Cadby Hall, Kensington, DOUGLASS, P. G., 12, Auriol Mansions, West Kensington, and PASSMORE, C. R., Ardneil, Oakleigh Park, Whetstone, all in London. Nov. 23, 1931, No. 32411. [Class 40 (v).] A time-lag device, which mav be used for keeping a door open for a predetermined period after a photo-electric cell has been shadowed by a passing person, is of the kind in which, as described in Specification 353,776, the duration of the effect is determined by the leaking away of a charge from a condenser. According to the invention the condenser is conductively in circuit with the controlling valve. The door-opening mechanism is controlled by relay 1, which remains de-energized so long as photo-electric cell 7 is illuminated by lamp 10, since the unidirectional current via A, 4, 6, 7, b puts a negative charge on grid 5g, and grid 3g also becomes sufficiently negative to de-energize magnet 1. When the cell 7 is shadowed, however, it becomes non-conducting, the small condenser 8 discharges, valve 5 passes current, and condenser 4 acquires a charge which positivizes grid 3g and causes energization of the door-opening relay 1. When the cell 7 is re-illuminated, the charge on the large condenser 4 slowly leaks away through the cell and the resistance 6. After an interval determined by the constants of the circuit, relay 1 again releases and the door closes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3241131A GB392928A (en) | 1931-11-23 | 1931-11-23 | Improvements in or relating to time lag devices |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3241131A GB392928A (en) | 1931-11-23 | 1931-11-23 | Improvements in or relating to time lag devices |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB392928A true GB392928A (en) | 1933-05-23 |
Family
ID=10338179
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3241131A Expired GB392928A (en) | 1931-11-23 | 1931-11-23 | Improvements in or relating to time lag devices |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB392928A (en) |
-
1931
- 1931-11-23 GB GB3241131A patent/GB392928A/en not_active Expired
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