GB392689A - Improvements in or relating to portable motion-picture projection apparatus - Google Patents

Improvements in or relating to portable motion-picture projection apparatus

Info

Publication number
GB392689A
GB392689A GB5399/32A GB539932A GB392689A GB 392689 A GB392689 A GB 392689A GB 5399/32 A GB5399/32 A GB 5399/32A GB 539932 A GB539932 A GB 539932A GB 392689 A GB392689 A GB 392689A
Authority
GB
United Kingdom
Prior art keywords
resistance
extension
switch
bar
closed
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
GB5399/32A
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.)
Siemens and Halske AG
Siemens AG
Original Assignee
Siemens and Halske AG
Siemens AG
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 Siemens and Halske AG, Siemens AG filed Critical Siemens and Halske AG
Publication of GB392689A publication Critical patent/GB392689A/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
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/2006—Lamp housings characterised by the light source
    • G03B21/202—Incandescent light sources
    • 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
    • G03B21/2053—Intensity control of illuminating light
    • 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
    • G03B21/32—Details specially adapted for motion-picture projection

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Projection Apparatus (AREA)
  • Push-Button Switches (AREA)
  • Adjustable Resistors (AREA)

Abstract

392,689. Locking switches. SIEMENS & HALSKE AKT. - GES., Siemensstadt, Berlin. Feb. 23, 1932, No. 5399. Convention date, Feb. 23, 1931. [Class 38 (v).] A switch 12 in series with a resistance regulator 1 for a cinematograph projector can only be closed when a certain minimum resistance is in circuit. When the switch is closed, the resistance can then be reduced to any desired amount. In the form shown, the shaft 2 of the resistance regulator carries a cam 3 which bears against a bar 4 sliding in bearings 6, 7 against the action of a spring 8. The end 4<1> of the bar 4 has flexibly mounted on it an extension 9 which comes in the path of the downwardly moving contact block 11 of the switch 12 when the resistance is below a certain amount, but if the switch 12 is already closed, the bar 4 can be moved from the dotted to full-line position to reduce resistance as desired, the extension 9 bending back in the process. An adjustable stop 14, 15 may also limit the movement of the cam 3, and a button 13 on the extension 9 allows the extension to be moved out of locking position by hand if desired. In a modification, an electromagnetic or mechanical arrangement is also operated by the rapid return of the extension 9 when the switch is opened to cause the regulator to move to a safe resistance.
GB5399/32A 1931-02-23 1932-02-23 Improvements in or relating to portable motion-picture projection apparatus Expired GB392689A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE392689X 1931-02-23

Publications (1)

Publication Number Publication Date
GB392689A true GB392689A (en) 1933-05-25

Family

ID=6387130

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5399/32A Expired GB392689A (en) 1931-02-23 1932-02-23 Improvements in or relating to portable motion-picture projection apparatus

Country Status (1)

Country Link
GB (1) GB392689A (en)

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