GB354661A - Improvements in and relating to holders for electric incandescent projection lamps - Google Patents
Improvements in and relating to holders for electric incandescent projection lampsInfo
- Publication number
- GB354661A GB354661A GB36725/30A GB3672530A GB354661A GB 354661 A GB354661 A GB 354661A GB 36725/30 A GB36725/30 A GB 36725/30A GB 3672530 A GB3672530 A GB 3672530A GB 354661 A GB354661 A GB 354661A
- Authority
- GB
- United Kingdom
- Prior art keywords
- lamp
- sleeve
- housing
- filament
- holder
- 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
Landscapes
- Securing Globes, Refractors, Reflectors Or The Like (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
- Lighting Device Outwards From Vehicle And Optical Signal (AREA)
Abstract
354,661. Electric lamp holders. GENERAL ELECTRIC CO., Ltd., Magnet House, Kingsway, London.-(Assignees of Patent-Treuhand-Ges. f³r Elektrische Gluhlampen; 11, Ehrenbergstrasse, Berlin.) Dec. 5, 1930, No. 36725. Convention date, Feb. 7. [Class 39 (ii).] To facilitate the positioning of the lamp filament relatively to the optical system of a projection lamp, more particularly of the kind used in connection with talking-films, the lamp cap is vertically adjustable in a holding-sleeve which, together with the lamp cap mounted therein, is movable in the horizontal plane in two mutually perpendicular directions. The lamp holder consists of a cylindrical housing 1, Fig. 1, of insulating material containing a metal sleeve 2 which is provided at its upper end with slits 5, Fig. 5, to render it flexible and has a circular flange 3 at its lower end engaging an annular hollow 4 in the housing 1. Mounted within the sleeve 2 is another sleeve 6 formed with two upwardly projecting arms 7 which engage within a pair of diametrically opposite slits 8 in the sleeve 2 and at their upper ends are formed with claws 22 adapted to engage above the bayonet pins 23 of a lamp cap 24 inserted in the holder. An insulating plunger 9 mounted within the sleeve 6 forms a guide for a central contact pin 10, the lower end of which is provided with a head 12 which is in contact with the central portion of a blade spring 11 passing through the sleeves 2, 6 into small channels 13, Fig. 4 (not shown), in the housing 1. Axial adjustment of the lamp holder is effected by means of a bolt 17 with screw threads 10 engaging a rotatable sleeve 19 which is held against vertical movement by a pin 20 in the housing 1, an operating- head 21 being secured to the sleeve 19. The upper end of the bolt has a head 16 which engages, through an interposed insulating ring 15, with an inwardly projecting flange 14 on the lower end of the sleeve 6, so that when the head 21 is turned to retract the bolt 17 the claws 22 bear downwardly upon the pins 23 and depress the lamp cap in opposition to the pressure of the spring 11. Lateral adjustment of the lamp holder is effected by two radial screws 34, 37, Fig. 2, disposed at right-angles to one another and bearing upon the periphery of the flange 3 of the holder 2, a helical spring 36 in a housing 35 being disposed diametrically opposite to the screw 34, and a similar spring 40, Fig. 4 (not shown), being arranged opposite to the screw 37. The adjustment of the lamp is facilitated by an auxiliary device comprising a cover 41 which is mounted on the housing over the lamp bulb 25, and has a cover 42 provided with two apertures 43, 44 above a frosted glass plate 45. A lens 47 projects an image of the lamp filament 26 on to the glass beneath the window 43, while a second lens 48 at right-angles to the lens 47 and on a level with the filament, through an interposed prism 51, projects an image of the filament on to the glass beneath the window 44. Graduations 53, 54, 55, Fig. 3, on the glass enable the images of the filament to be adjusted correctly. The holder is provided with two contact pins 30, 31, Fig. 2, which project laterally from the housing 1 so that it can be connected to a socket and maintain the filament in its correct position.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE354661X | 1930-02-07 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB354661A true GB354661A (en) | 1931-08-13 |
Family
ID=6289750
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB36725/30A Expired GB354661A (en) | 1930-02-07 | 1930-12-05 | Improvements in and relating to holders for electric incandescent projection lamps |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB354661A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN114296202A (en) * | 2022-02-25 | 2022-04-08 | 复旦大学 | Vacuum seal type optical lens adjusting device |
-
1930
- 1930-12-05 GB GB36725/30A patent/GB354661A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN114296202A (en) * | 2022-02-25 | 2022-04-08 | 复旦大学 | Vacuum seal type optical lens adjusting device |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US2004200A (en) | Lamp socket adapter | |
US1338818A (en) | Optical apparatus and method of operating the same | |
GB354661A (en) | Improvements in and relating to holders for electric incandescent projection lamps | |
US2080844A (en) | Diagnostic instrument | |
US1992041A (en) | Light projector | |
US1401664A (en) | Optical checking apparatus | |
GB319748A (en) | ||
US1782705A (en) | Diagnostic instrument | |
US3366784A (en) | Quartz lamp light source for existing spotlight apparatus, with terminal mounting means to accomplish focusing position | |
USRE22848E (en) | Illuminating unit for optical | |
GB397311A (en) | Improvements in or relating to electric incandescent lamps | |
US2156916A (en) | Flashlight | |
GB270297A (en) | Electric lamp for cinematographic apparatus | |
US2563435A (en) | Device fok puefoctjsing lamps | |
US1310476A (en) | Illuminated writing instrument | |
US2653217A (en) | Projection lamp holder | |
GB641896A (en) | Range finder arrangement for light beam projecting range finders and viewing range finders | |
US3286215A (en) | Socket for plug-in lamps | |
US2986626A (en) | Illuminating device for a map simulator | |
GB271446A (en) | Improvements in or relating to attaching means for electric incandescent lamps | |
GB291401A (en) | Improvements in incandescent electric lamps for projection apparatus | |
GB498182A (en) | Improvements in the manufacture of electric lamps capped at each end | |
US1563471A (en) | Diagnostic instrument | |
GB599225A (en) | Improvements in lighting apparatus | |
GB432459A (en) | Improvements in sockets for tubular electric light sources |