GB1129938A - Portable movie screen device - Google Patents

Portable movie screen device

Info

Publication number
GB1129938A
GB1129938A GB1662667A GB1662667A GB1129938A GB 1129938 A GB1129938 A GB 1129938A GB 1662667 A GB1662667 A GB 1662667A GB 1662667 A GB1662667 A GB 1662667A GB 1129938 A GB1129938 A GB 1129938A
Authority
GB
United Kingdom
Prior art keywords
legs
arm
spring
cam
case
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
GB1662667A
Inventor
Russell Edward Petrick
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.)
Knox Manufacturing Co
Original Assignee
Knox Manufacturing Co
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 Knox Manufacturing Co filed Critical Knox Manufacturing Co
Priority to GB1662667A priority Critical patent/GB1129938A/en
Publication of GB1129938A publication Critical patent/GB1129938A/en
Expired legal-status Critical Current

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)
  • Overhead Projectors And Projection Screens (AREA)
  • Transforming Electric Information Into Light Information (AREA)

Abstract

1,129,938. Projection screens. KNOX MFG. CO. April 11, 1967, No.16626/67. Heading G2J. In an upright projection screen stand in which three legs 33 are pivotally attached to a collar 28 slidable on vertical tubular standard 17, the legs being braced by struts 35 pivoting on a fixed collar 30, the legs are automatically extended, when screen case 16 is swung to the horizontal operative position, by means of a torsion spring (38) at each pivot (37) on the legs, Fig. 5 (not shown), the legs being retracted when the stand is lifted by a spring (25) within standard (17) bearing against an arm (41), of an arcuate arm (43) pivoted at (36) to the end of each strut (35). For springs (38) to operate, the stronger spring (25) is first released from the compressed state against face (54b) of cam (50), by rotation of the cam to the position of Fig. 5 by means of an arm (46) which the screen case 16 displaces in moving to the operative position. In the vertical, inoperative position, case 16 is latched by lug 23 of a bail support 22 on the telescoping rod 18.
GB1662667A 1967-04-11 1967-04-11 Portable movie screen device Expired GB1129938A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1662667A GB1129938A (en) 1967-04-11 1967-04-11 Portable movie screen device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1662667A GB1129938A (en) 1967-04-11 1967-04-11 Portable movie screen device

Publications (1)

Publication Number Publication Date
GB1129938A true GB1129938A (en) 1968-10-09

Family

ID=10080716

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1662667A Expired GB1129938A (en) 1967-04-11 1967-04-11 Portable movie screen device

Country Status (1)

Country Link
GB (1) GB1129938A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2181289A (en) * 1985-10-03 1987-04-15 Spacesaver Signs Portable sign
GB2217191A (en) * 1988-04-22 1989-10-25 Michael Hung A retractable tripod
WO2007123500A2 (en) * 2006-04-21 2007-11-01 M. T Reklam Ve Pazarlama Sanayi Ticaret Limited Sirketi Height adjustment mechanism for quick installed posters

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2181289A (en) * 1985-10-03 1987-04-15 Spacesaver Signs Portable sign
GB2217191A (en) * 1988-04-22 1989-10-25 Michael Hung A retractable tripod
WO2007123500A2 (en) * 2006-04-21 2007-11-01 M. T Reklam Ve Pazarlama Sanayi Ticaret Limited Sirketi Height adjustment mechanism for quick installed posters
WO2007123500A3 (en) * 2006-04-21 2007-12-27 M T Reklam Ve Pazarlama Sanayi Height adjustment mechanism for quick installed posters

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