GB530750A - Improvements in or relating to electric mining lamps - Google Patents
Improvements in or relating to electric mining lampsInfo
- Publication number
- GB530750A GB530750A GB19246/39A GB1924639A GB530750A GB 530750 A GB530750 A GB 530750A GB 19246/39 A GB19246/39 A GB 19246/39A GB 1924639 A GB1924639 A GB 1924639A GB 530750 A GB530750 A GB 530750A
- Authority
- GB
- United Kingdom
- Prior art keywords
- lamp
- contacts
- terminals
- accumulator
- july
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21L—LIGHTING DEVICES OR SYSTEMS THEREOF, BEING PORTABLE OR SPECIALLY ADAPTED FOR TRANSPORTATION
- F21L4/00—Electric lighting devices with self-contained electric batteries or cells
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F3/00—Colour separation; Correction of tonal value
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Secondary Cells (AREA)
Abstract
530,750. Electric battery lamps. FRIEMANN & WOLF GES. July 1, 1939, No. 19246. Convention date, July 1, 1938. [Class 39 (ii)] In a miner's electric lamp the contacts on the lamp bulb are arranged to co-operate directly with the terminals of the accumulator. Figs. 3 and 4 show alternative constructions in which (1) contacts 13 on the side of the lamp cap cooperate with spring contact blades 12 forming terminals, and (2) contacts 21 on the under face of an enlarged lamp cap 20 co-operate with spring contact plungers 4 forming accumulator terminals. Switching is effected by rotation of the accumulator casing which is prevented from being completely unscrewed from the upper part of the lamp by a magnetic lock.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE530750X | 1938-07-01 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB530750A true GB530750A (en) | 1940-12-19 |
Family
ID=6554636
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB19246/39A Expired GB530750A (en) | 1938-07-01 | 1939-07-01 | Improvements in or relating to electric mining lamps |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB530750A (en) |
-
1939
- 1939-07-01 GB GB19246/39A patent/GB530750A/en not_active Expired
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