US3807934A - Flashcube construction - Google Patents

Flashcube construction Download PDF

Info

Publication number
US3807934A
US3807934A US00346757A US34675773A US3807934A US 3807934 A US3807934 A US 3807934A US 00346757 A US00346757 A US 00346757A US 34675773 A US34675773 A US 34675773A US 3807934 A US3807934 A US 3807934A
Authority
US
United States
Prior art keywords
mounting plate
spring
multiflash
striker
springs
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 - Lifetime
Application number
US00346757A
Other languages
English (en)
Inventor
J Lukas
A Wacker
I Kress
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.)
Osram GmbH
Original Assignee
Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
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 Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH filed Critical Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
Application granted granted Critical
Publication of US3807934A publication Critical patent/US3807934A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • G03B15/00—Special procedures for taking photographs; Apparatus therefor
    • G03B15/02—Illuminating scene
    • G03B15/03—Combinations of cameras with lighting apparatus; Flash units
    • G03B15/04—Combinations of cameras with non-electronic flash apparatus; Non-electronic flash units
    • G03B15/0478—Combinations of photographic apparatus with percussion type flash ignition systems
    • G03B15/0484—Constructional details of the flash apparatus

Definitions

  • the flashcube has a transparent protective cube, a reflector member formed of four individual reflectors and four mechanically ignitable flashbulbs seated on the mounting plate, one each associated with a reflector.
  • the mounting plate has four openings which are used as passage for the trigger pin coming from the camera to actuate the striker arm of a strikingmechanism spring held in prestressed position such that when the striker arm is released, it springs back to its rest position and thereby strikes the igniter in the tubulation projecting from the bulb.
  • the four striker arms are held in prestressed position by a metal member provided in the mounting plate; it is shaped as a plate with four flaps bent upwards at right angle, or as a cup provided with notches in the side wall.
  • the invention relates to a multiflash system and more particularly to a flashcube construction with four mechanically ignitable flashbulbs incorporated therein.
  • the flashcube is of similar design to conventional flashcubes including electrically ignitable flashbulbsv and comprises a cube-shaped, light-transmissive protective covering which encloses a reflector seated on a mounting plate.
  • the mounting plate is externally provided with a jack holder which is designed such that the flashcube can be supported in an adapter provided therefor on the camera.
  • Four mechanically ignitable flashbulbs are inserted in the mounting plate in a manner such that the igniter tubes projecting from the bulbs are inserted in blind holes provided therefor.
  • British Patent 1,294,370 disclose e.g. a torsion spring which functions as the aforesaid striking mechanism.
  • This torsion spring is shaped from piano wire, has a U-shaped portion which comes to lie between the reflectors when the Specifications 1,294,369 and spring is mounted and has an arm at right angle to the U-shaped portion which is used as the striker arm.
  • the other end of the spring is of hook shape and keeps the striker arm in the required tensioned position.
  • the two above described springs have in common that the striker arm is held in its tensioned position by the respective, particularly hook-shaped, design of the other spring end. In most cases the hook-shaped spring end is simultaneously used to locate the striking mechanism in position within the mounting plate.
  • the spring thus has several functions: it serves as a striking mechanism; provides its own seating; and holds itself tensioned. This renders the shape of the spring complex. Manufacture of such springs is rather complicated; further, the complex spring design leads to substantial difficulties during mounting. It is not possible to mechani cally separate these springs, when in a bulk package, since entangling of their loops, arms, coiled and/or U- shaped portions, occurs and disentangling is only possible by hand. Disentangling by hand, however, introduces atime consuming step in the assembly of the flashcubes, which, therefore, introduces additional expense.
  • the strikingmechanism springs can be designed as simple spring clips with straight arms since a hook-shaped end for keeping the striker arm in prestressed position can now be omitted.
  • the metallic member holding the striker arms in their tensioned position may have the form of a small plate which is positively seated and positioned by engagement with a respective recess of the mounting plate. Four flaps are bent upwards from the plate and form the respective contact surfaces for the striker arms. Instead of a plate a cup-shaped metallic member may be used which is seated in the recess.
  • the side walls are formed with four notches, or cut-outs, the remainder of the walls providing the necessary bearing surfaces for the striker arms of the springs.
  • FIG. 1 is an exploded perspective view of a flashcube
  • FIG. 2a is a front view
  • FIG. 2b is a side view of a holding plate
  • FIG. 3a is a front view
  • FIG. 3b is a sectional view along lines A-B of FIG. 3a
  • the flashcube shown in FIG. 1 comprises the transparent protective cube l which encloses the four-sided reflector 2. Both reflector and protective cube are seated on a mounting plate 3 which has a stop shoulder 4.
  • the mounting plate 3 is a plastic casting or molding and has four blind holes 5 which receive the tubes 7 projecting from the mechanically ignitable flashbulbs 6.
  • Tube 7 contains an igniter which is ignitable by impact and causes combustion of combustible material, e.g. zirconium shreds enclosed in the flashbulb.
  • the mounting plate 3 is provided with four openings 8 in the form of sectional annular grooves which are used as passages for a trigger pin (not shown) coming from the camera.
  • Pins 9 are cast integrally with the corners of mounting plate 3 and one spiral spring 10, each, serves as the striking mechanism and is seated on each respective pin.
  • Spiral spring 10 has several turns with a diameter selected so as to fit over pins 9, and has two straight arms, preferably of about equal lengths, one of which is used as the striker arm.
  • the striker arms are held in the required tensioned position by a metallic member 11 located in the center of mounting plate 3.
  • the mounting plate 3 has a circular recess 12 with lugs 13 for accommodation of metallic member 11 in positively seated locked engagement to be supported therein such that distortion is prevented.
  • the metallic member 11 is a small, essentially square plate of sheet steel with its corners rounded off so as to fit in recess 12 and provided with recesses 14 which are in interlocking engagement with lugs 13 of mounting plate 3.
  • a flap 15 is bent upwardly at right angle to the plate close to recesses 14. The flaps 15 keep the striker arm of the springs 10 in the required tensioned position. Their height is such that the striker arm can be lifted by the trigger pin from the camera, to slide overhead past the flaps to spring back to its rest position.
  • the plate may have a central bore or opening 16 which affords advantages in manufacture and assembly, and prevents distortion, while decreasing the weight of the plate and use of material.
  • the metallic member 11 may have the shape of a cup.
  • the cup is deep-drawn from sheet steel; it may also have (because of manufacturing techniques) a central opening 18. Its outer diameter corresponds to recess 12 in mounting plate 3.
  • the cup has four radial recesses 17 which are interlocked with lugs 13.
  • the recesses 17 are continued in wall 19 so that the wall is interrupted and provides, at the side edge of the side wall 19, contact surfaces for the striker arms to hold the striker arms in tensioned position.
  • a multiflash element comprising a transparent protective housing enclosing a multisided reflector (2), a mounting plate (3), and a plurality of mechanically ignitable flashbulbs (6) having igniter tubes (7) inserted in the mounting plate,
  • the mounting plate being formed with openings forming passages (8) for camera trigger means;
  • each spring for each bulb, each spring having a striker arm adapted to be engaged by the camera trigger means so that, when the striker arm is released, it may spring back from tensioned position towards its rest position and thereby strike, sideways, the igniter in the tube (7) projecting from the bulb,
  • the improvement comprises a metallic member (11) located in the center of the mounting plate (3) interlocked therewith, and holding the respective striker arms of the springs (10), the means holding the springs being located at the circumference of the mounting plate (3) to hold the springs, by cooperation with the plate, in tensioned condition.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Stroboscope Apparatuses (AREA)
  • Toys (AREA)
  • Accessories Of Cameras (AREA)
US00346757A 1972-04-20 1973-04-02 Flashcube construction Expired - Lifetime US3807934A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2219390A DE2219390C3 (de) 1972-04-20 1972-04-20 Mehrfachblitzeinrichtung

Publications (1)

Publication Number Publication Date
US3807934A true US3807934A (en) 1974-04-30

Family

ID=5842724

Family Applications (1)

Application Number Title Priority Date Filing Date
US00346757A Expired - Lifetime US3807934A (en) 1972-04-20 1973-04-02 Flashcube construction

Country Status (3)

Country Link
US (1) US3807934A (tr)
JP (1) JPS4922123A (tr)
DE (1) DE2219390C3 (tr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5821451A (en) * 1996-12-19 1998-10-13 Eastman Kodak Company Photoflash particle mixture

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3584989A (en) * 1969-10-22 1971-06-15 Eastman Kodak Co Apparatus for arming percussion-ignitable flash units
US3737643A (en) * 1970-08-05 1973-06-05 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Multiflash device, particularly flashcube, with mechanical striking mechanism

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3584989A (en) * 1969-10-22 1971-06-15 Eastman Kodak Co Apparatus for arming percussion-ignitable flash units
US3737643A (en) * 1970-08-05 1973-06-05 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Multiflash device, particularly flashcube, with mechanical striking mechanism

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5821451A (en) * 1996-12-19 1998-10-13 Eastman Kodak Company Photoflash particle mixture

Also Published As

Publication number Publication date
DE2219390C3 (de) 1980-11-20
JPS4922123A (tr) 1974-02-27
DE2219390B2 (de) 1980-03-20
DE2219390A1 (de) 1973-11-08

Similar Documents

Publication Publication Date Title
US4563730A (en) Vehicle head lamp with synthetic resin reflector and ring-shaped heat shielding member
US3807934A (en) Flashcube construction
US4747029A (en) Headlamp assembly
US3553520A (en) High intensity driving lamps particularly for road vehicles
US3739166A (en) Photoflash device
US3769501A (en) Selective actuating mechanism for percussive photoflash lamp array
US3253504A (en) Projection lamp
US4098565A (en) Flashlamp unit
US4470104A (en) Automotive inner-bulb assembly
US2769069A (en) Illuminated push button switch
US3537805A (en) Z-shape striker spring for percussionignitable,multilamp flash units
US2338970A (en) Fluorescent tube socket
KR910013425A (ko) 이중 단부 텅스턴-할로겐 램프용 내진동 장착 구조물
US3737643A (en) Multiflash device, particularly flashcube, with mechanical striking mechanism
JPS59101251U (ja) 低電圧白熱ランプ装置
US3702582A (en) Multiflash device, such as flashcube, with mechanically ignitable flashlamps
US3614413A (en) Percussion activatable flash units having individual striker elements
EP0918188B1 (en) Lighting unit
US3902842A (en) Lamp-ignitor means for percussive type multiflash device
US3582948A (en) Flush mount indicator housing with flexible tongue
US1896887A (en) Stop and tail lamp
JPS6336112B2 (tr)
US2731545A (en) Flashlight
US3991308A (en) Multiflash unit, particularly flashcube
US1876877A (en) Reflecting electric lamp