GB1421095A - Overhead projector - Google Patents
Overhead projectorInfo
- Publication number
- GB1421095A GB1421095A GB2127974A GB2127974A GB1421095A GB 1421095 A GB1421095 A GB 1421095A GB 2127974 A GB2127974 A GB 2127974A GB 2127974 A GB2127974 A GB 2127974A GB 1421095 A GB1421095 A GB 1421095A
- Authority
- GB
- United Kingdom
- Prior art keywords
- lamp
- lamps
- overhead projector
- switch
- operative position
- 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
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/132—Overhead projectors, i.e. capable of projecting hand-writing or drawing during action
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2006—Lamp housings characterised by the light source
- G03B21/2013—Plural light sources
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Projection Apparatus (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
Abstract
1421095 Overhead projector G RITZERFELD 14 May 1974 [23 June 1973] 21279/74 Heading G2J An overhead projector has two lamps 2, 3 mounted on a common frame 1 which is displaceable perpendicularly to the optical path so that each of the two lamps is selectively movable into an operative position. As shown, lamp 2 is in the operative position. If it fails, a lever 8 is manually operated to move frame 1 and to operate contacts 11 which switch off lamp 2, switch on lamp 3 and energize a warning lamp (not shown) indicating that lamp 2 requires replacement. The lamps are housed in a box 12 which is vertically displaceable by cam disc segments 19 to accommodate different projection distances.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19737323841U DE7323841U (en) | 1973-06-23 | 1973-06-23 | DAYLIGHT PROJECTION DEVICE |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1421095A true GB1421095A (en) | 1976-01-14 |
Family
ID=6639341
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2127974A Expired GB1421095A (en) | 1973-06-23 | 1974-05-14 | Overhead projector |
Country Status (7)
Country | Link |
---|---|
BE (1) | BE814924A (en) |
CH (1) | CH566020A5 (en) |
DE (1) | DE7323841U (en) |
DK (1) | DK333674A (en) |
FR (1) | FR2234828A5 (en) |
GB (1) | GB1421095A (en) |
NO (1) | NO741871L (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2276248A (en) * | 1993-03-17 | 1994-09-21 | Minnesota Mining & Mfg | Lamp changer assembly for an overhead projector |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE7628047U1 (en) * | 1976-09-08 | 1976-12-30 | Rollei-Werke Franke & Heidecke, 3300 Braunschweig | STILL PROJECTOR |
-
1973
- 1973-06-23 DE DE19737323841U patent/DE7323841U/en not_active Expired
- 1973-12-14 FR FR7344734A patent/FR2234828A5/fr not_active Expired
-
1974
- 1974-04-29 CH CH586374A patent/CH566020A5/xx not_active IP Right Cessation
- 1974-05-13 BE BE144230A patent/BE814924A/en unknown
- 1974-05-14 GB GB2127974A patent/GB1421095A/en not_active Expired
- 1974-05-22 NO NO741871A patent/NO741871L/no unknown
- 1974-06-21 DK DK333674A patent/DK333674A/da unknown
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2276248A (en) * | 1993-03-17 | 1994-09-21 | Minnesota Mining & Mfg | Lamp changer assembly for an overhead projector |
GB2276248B (en) * | 1993-03-17 | 1996-04-10 | Minnesota Mining & Mfg | Lamp changing assembly for overhead projector |
Also Published As
Publication number | Publication date |
---|---|
FR2234828A5 (en) | 1975-01-17 |
DE7323841U (en) | 1973-11-22 |
DK333674A (en) | 1975-02-10 |
NO741871L (en) | 1975-01-20 |
BE814924A (en) | 1974-09-02 |
CH566020A5 (en) | 1975-08-29 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CA1017604A (en) | Illuminated reticle projection system | |
CA1034202A (en) | Circuit for detecting burned-out lamp for a buoy lamp changer | |
GB1252457A (en) | ||
ES444961A1 (en) | Electrical switch having actuator light transmissive region, intermediate lens and light source | |
GB1421095A (en) | Overhead projector | |
ES448894A1 (en) | Vehicle lighting assemblies | |
CA962734A (en) | Auxiliary lighting system for arc lamp | |
GB1193814A (en) | Lamp Turret Assembly with Energizing and Aligning Device | |
CA1019370A (en) | Pneumatic operating mechanism for a power circuit breaker | |
AU502642B2 (en) | Arrangement for operating a discharge lamp | |
JPS52146233A (en) | Device for replacing projector lamp | |
ES201747U (en) | Switch for direction indicators. (Machine-translation by Google Translate, not legally binding) | |
CA1011062A (en) | Wiper for lamp lenses | |
GB736930A (en) | Improvements in or relating to electric battery lamps | |
GB1232847A (en) | Switching control apparatus for vehicle direction indicators and main lights | |
GB1133220A (en) | Projector | |
GB796416A (en) | Improvements in or relating to kinematograph film projectors | |
GB1026575A (en) | Slide projector | |
GB1429283A (en) | Overhead projector | |
ES209434A2 (en) | Improvements in the switches for small amperajes (Machine-translation by Google Translate, not legally binding) | |
CA1004264A (en) | Stored-energy operating mechanism for switch blades | |
ZA731652B (en) | Device for operating the fingertiptumbler type light switch | |
CA984882A (en) | Toggle mechanism for mercury switch | |
ZA731653B (en) | Device for operating the toggle type light switch | |
CA499908A (en) | Retaining mechanism for a sealed beam lamp type locomotive headlight assembly |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed [section 19, patents act 1949] | ||
PCNP | Patent ceased through non-payment of renewal fee |