GB2050641B - Raising and lowering flexible sheets eg roller blinds projection screens - Google Patents

Raising and lowering flexible sheets eg roller blinds projection screens

Info

Publication number
GB2050641B
GB2050641B GB7920744A GB7920744A GB2050641B GB 2050641 B GB2050641 B GB 2050641B GB 7920744 A GB7920744 A GB 7920744A GB 7920744 A GB7920744 A GB 7920744A GB 2050641 B GB2050641 B GB 2050641B
Authority
GB
United Kingdom
Prior art keywords
raising
flexible sheets
projection screens
roller blinds
lowering
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
Application number
GB7920744A
Other versions
GB2050641A (en
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
HARKNESS SCREENS Ltd
Original Assignee
HARKNESS SCREENS Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by HARKNESS SCREENS Ltd filed Critical HARKNESS SCREENS Ltd
Priority to GB7920744A priority Critical patent/GB2050641B/en
Publication of GB2050641A publication Critical patent/GB2050641A/en
Application granted granted Critical
Publication of GB2050641B publication Critical patent/GB2050641B/en
Expired legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
    • E06B9/00—Screening or protective devices for wall or similar openings, with or without operating or securing mechanisms; Closures of similar construction
    • E06B9/56—Operating, guiding or securing devices or arrangements for roll-type closures; Spring drums; Tape drums; Counterweighting arrangements therefor
    • E06B9/64—Operating, guiding or securing devices or arrangements for roll-type closures; Spring drums; Tape drums; Counterweighting arrangements therefor with lowerable roller
    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
    • E06B9/00—Screening or protective devices for wall or similar openings, with or without operating or securing mechanisms; Closures of similar construction
    • E06B9/56—Operating, guiding or securing devices or arrangements for roll-type closures; Spring drums; Tape drums; Counterweighting arrangements therefor
    • E06B9/80—Safety measures against dropping or unauthorised opening; Braking or immobilising devices; Devices for limiting unrolling
    • E06B9/82—Safety measures against dropping or unauthorised opening; Braking or immobilising devices; Devices for limiting unrolling automatic
    • E06B9/84—Safety measures against dropping or unauthorised opening; Braking or immobilising devices; Devices for limiting unrolling automatic against dropping
    • 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

  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Operating, Guiding And Securing Of Roll- Type Closing Members (AREA)
GB7920744A 1979-06-14 1979-06-14 Raising and lowering flexible sheets eg roller blinds projection screens Expired GB2050641B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB7920744A GB2050641B (en) 1979-06-14 1979-06-14 Raising and lowering flexible sheets eg roller blinds projection screens

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB7920744A GB2050641B (en) 1979-06-14 1979-06-14 Raising and lowering flexible sheets eg roller blinds projection screens

Publications (2)

Publication Number Publication Date
GB2050641A GB2050641A (en) 1981-01-07
GB2050641B true GB2050641B (en) 1983-01-26

Family

ID=10505846

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7920744A Expired GB2050641B (en) 1979-06-14 1979-06-14 Raising and lowering flexible sheets eg roller blinds projection screens

Country Status (1)

Country Link
GB (1) GB2050641B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111781794A (en) * 2020-07-23 2020-10-16 深圳市环途创意文化传播有限公司 Adjustable holographic projection screen based on holographic projection technology

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8612854D0 (en) * 1986-05-27 1986-07-02 Machin Designs Ltd Roller blind assembly
EP0665360A1 (en) * 1994-02-01 1995-08-02 Galebreaker Products Division Of Farmplan Group Limited Movable closure for openings in buildings and like enclosures
FI982177A (en) * 1998-10-07 2000-04-08 Reumi Oy Cardboard box drive device
NL1021525C2 (en) * 2002-09-24 2004-03-25 Projecta B V Projection screen system, has unrolled region of screen cloth masked by turned back bottom end of cloth
CN103348083B (en) * 2010-12-22 2016-08-10 Somfy两合公司 For operating the electrically operated device with the movable curtain that can wind cord of curtain or screen device
US9982484B2 (en) * 2016-07-21 2018-05-29 Stoebich Brandschutz Gmbh Closure member control system
US10684542B2 (en) 2017-05-16 2020-06-16 Draper, Inc. Projection screen system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111781794A (en) * 2020-07-23 2020-10-16 深圳市环途创意文化传播有限公司 Adjustable holographic projection screen based on holographic projection technology

Also Published As

Publication number Publication date
GB2050641A (en) 1981-01-07

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee