DE652578C - Safety device for the local limitation of film areas in projectors - Google Patents

Safety device for the local limitation of film areas in projectors

Info

Publication number
DE652578C
DE652578C DEP70272D DEP0070272D DE652578C DE 652578 C DE652578 C DE 652578C DE P70272 D DEP70272 D DE P70272D DE P0070272 D DEP0070272 D DE P0070272D DE 652578 C DE652578 C DE 652578C
Authority
DE
Germany
Prior art keywords
safety device
projectors
film
local limitation
film areas
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
DEP70272D
Other languages
German (de)
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to DEP70272D priority Critical patent/DE652578C/en
Application granted granted Critical
Publication of DE652578C publication Critical patent/DE652578C/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
    • G03B21/18—Fire preventing or extinguishing

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Projection Apparatus (AREA)

Description

Sicherheitsvorrichtung-zur örtlichen Begrenzung von Filmbränden in Bildwerfern Zusatz zum Patent 636 498 . Im Patent 636 498 ist bereits eine Sicherheitsvorrichtung zur örtlichen Begrenzung von Filmbränden in Bildwerfern, die über vom brennenden Film aus entflammte Brennfäden Durchschneideeinrichtungen vor und hinter der Brennstelle betätigt, mit dem besonderen Kennzeichen vorgeschlagen worden, daß die Brennfäden im Bildfenstertürrahmen in unmittelbarer Nähe des Films angeordnet sind. Dadurch erreicht man, daß die Durchschneideeinrichtungen in Tätigkeit treten, wenn sich noch unverbrannte Filmteile zwischen Brandstelle und Durchschneideeinrichtungen befinden, so daß ein Übergreifen des Brandes auf die in den Filmtrommeln befindlichen Filmteile. ausgeschlossen ist.Safety device - for the local limitation of film fires in Image projector addendum to patent 636 498. The patent 636 498 already has a safety device for the local limitation of film fires in projectors that are above the burning Film made of inflamed filaments. Cutting devices in front of and behind the burning point actuated, has been proposed with the special mark that the filaments are arranged in the picture window door frame in the immediate vicinity of the film. Through this one achieves that the cutting devices come into action when Parts of the film that have not yet been burned between the burn and the cutting devices are located, so that the fire spreads to those in the film drums Film parts. is excluded.

Die Erfindung hat eine weitere Ausbildung der bereits vorgeschlagenen Einrichtung zum Gegenstand. Nach der Erfindung sind bei einer nach Patent 636 498 ausgebildeten Sicherheitsvorrichtung die in an sich bekannter Weise die Motor- und Lichtstromkreise steuernden Kontakte am Bildfenstertürrahmen angeordnet, so daß Verzögerungen in der Unterbrechung der Steuerstromkreise ausgeschlossen sind und die Gefahr der Förderung weiteren Films in die Brandstelle vermieden wird.The invention has a further development of that already proposed Facility to the subject. According to the invention are in one according to patent 636,498 trained safety device which in a known manner the engine and Luminous circuits controlling contacts arranged on the picture window door frame, so that Delays in the interruption of the control circuits are excluded and the risk of conveying further film into the fire area is avoided.

Claims (1)

PATENTANSPRUCH: Sicherheitsvorrichtung zur örtlichen Begrenzung von Filmbränden in Bildwerfern nach Patent 636 498, dadurch gekennzeichnet, daß die in an sich bekannter Weise die Motor- und Lichtstromkreise steuernden Kontakte am Bildfenstertürrahmen angeordnet sind.PATENT CLAIM: Safety device for the local limitation of Film fires in image projectors according to patent 636 498, characterized in that the in a manner known per se, the motor and lighting circuits controlling contacts on Picture window door frames are arranged.
DEP70272D 1934-11-11 1934-11-11 Safety device for the local limitation of film areas in projectors Expired DE652578C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEP70272D DE652578C (en) 1934-11-11 1934-11-11 Safety device for the local limitation of film areas in projectors

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEP70272D DE652578C (en) 1934-11-11 1934-11-11 Safety device for the local limitation of film areas in projectors

Publications (1)

Publication Number Publication Date
DE652578C true DE652578C (en) 1937-11-03

Family

ID=7391594

Family Applications (1)

Application Number Title Priority Date Filing Date
DEP70272D Expired DE652578C (en) 1934-11-11 1934-11-11 Safety device for the local limitation of film areas in projectors

Country Status (1)

Country Link
DE (1) DE652578C (en)

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