GB332882A - Improvements in or relating to projection screens - Google Patents
Improvements in or relating to projection screensInfo
- Publication number
- GB332882A GB332882A GB80730A GB80730A GB332882A GB 332882 A GB332882 A GB 332882A GB 80730 A GB80730 A GB 80730A GB 80730 A GB80730 A GB 80730A GB 332882 A GB332882 A GB 332882A
- Authority
- GB
- United Kingdom
- Prior art keywords
- loops
- projection screens
- relating
- cord
- frame
- 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
- G03B21/54—Accessories
- G03B21/56—Projection screens
- G03B21/58—Projection screens collapsible, e.g. foldable; of variable area
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Springs (AREA)
Abstract
332,882. Bloor, H., and Mitchelson, H. M. Jan. 9, 1930. Projection screens 1 are mounted by means of a cord or the like 5 slidably threaded within a folded edge-piece 4 fixed round the screen, the cord being formed at intervals into loops 6 projecting through slots 7 and detachably connected by elastic members to a frame or the like 2. The elastic members may comprise coiled springs 8 which are fixed to the frame by screw eyes 9 and are formed with hooks Sa directly engaging the loops 6 or engaging metal rings 10 detachably connected to the loops.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB80730A GB332882A (en) | 1930-01-09 | 1930-01-09 | Improvements in or relating to projection screens |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB80730A GB332882A (en) | 1930-01-09 | 1930-01-09 | Improvements in or relating to projection screens |
Publications (1)
Publication Number | Publication Date |
---|---|
GB332882A true GB332882A (en) | 1930-07-31 |
Family
ID=9710836
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB80730A Expired GB332882A (en) | 1930-01-09 | 1930-01-09 | Improvements in or relating to projection screens |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB332882A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1140368B (en) * | 1958-06-24 | 1962-11-29 | Lens N V | Collapsible projection screen |
CN106019792A (en) * | 2009-06-12 | 2016-10-12 | 迪瑞波有限公司 | Projection screen assembly |
-
1930
- 1930-01-09 GB GB80730A patent/GB332882A/en not_active Expired
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1140368B (en) * | 1958-06-24 | 1962-11-29 | Lens N V | Collapsible projection screen |
CN106019792A (en) * | 2009-06-12 | 2016-10-12 | 迪瑞波有限公司 | Projection screen assembly |
JP2017129867A (en) * | 2009-06-12 | 2017-07-27 | ドレイパー,インコーポレイテッド | Tensioned projection screen assembly |
US10018901B2 (en) | 2009-06-12 | 2018-07-10 | Draper, Inc. | Tensioned projection screen assembly |
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