Abstract: The invention relates to a crank drive, particularly to a crank drive for photographic cameras having a crank including a crankpin, and a drawbar pivotable about the crankpin. The drawbar consists of first and second rods connected to one another, and disposed in respective substantially parallel planes, which rods are joined or connected by a hinge having a hinge axis substantially parallel to the crankpin axis.

Abstract: A still projector with a magazine guide channel, a projection lens, and a manual electrical switch has a cover that encloses all these components and fits closely in a recess in the housing. The cover is preferably shaped to fit the external contour of the housing and has a first plate covering the projection lens and one end of the magazine channel, a second plate covering a switch and the other end of the magazine channel, and a panel extending between the two plates and covering the top of the magazine channel.

Abstract: In a roll film camera, using a cartridge, an alternately actuatable slider-locking and cartridge-latching mechanism, a film-gate adjustment device for releasably pressing against a film gate, and a coupling mechanism operative for activating, and, respectively, inactivating the camera feeding mechanism, are operatively connected to a common mode-changing control operable from the cartridge exterior.

Abstract: Disclosed is a drive mechanism for a slide projector adapted for accepting a circular slide magazine of the type including an approximately h-shaped configuration wall having a pair of forked inner and outer wall parts in coaxial spaced relationship located near the axial end of the housing which abuts the projector, the outer wall part having on its side facing the inner wall part a plurality of recesses corresponding in number to the slide compartments. The drive mechanisms for selectively rotating the slide magazine comprises a drive member mounted for rotation on the projector housing at a location adjacent the h-shaped wall configuration of a mounted slide magazine, and at least one drive pin mounted excentrically on the drive member substantially parallel to the axis of rotation of the drive member, for projecting into the space between the inner and outer wall parts of the h-shaped configuration.

Abstract: A slide projector having resilient flexible elements mounted on the projector to engage the edges of slides in magazine compartments next to the compartment from which a slide is to be withdrawn or to which a projected slide is to be returned, for shifting the slides in the adjacent compartments to upright positions flat against the partition walls of the magazine, so that they will not tilt to positions overlying the compartment from which a slide is to be withdrawn or to which it is to be returned, thus avoiding possible interference with the withdrawal or return.

Abstract: A deformable camera case, alternatively usable as a camera stand, includes a wall in the form of a flexible cushion preferably filled with a plurality of small balls, that constitutes a pliable body capable of adjusting its shape to the contours of an object suitable for supporting the camera in a desired stable position.

Abstract: A control circuit for rapid charging of an accumulator with a pulsating current includes a transistor arranged for switching the charge current on and off. The collector circuit of the transistor has an emitter resistor arranged to establish a control voltage that is substantially constant throughout each pulse of the charge current, and a comparator has an output connected to the base of the transistor and inputs from a reference voltage and the voltage on the accumulator so as to block the transistor when the charge voltage exceeds the reference voltage. The emitter resistor is preferably an incandescent lamp, a zener diode is preferably arranged in parallel with the lamp to provide a constant voltage for the base-emitter circuit of the transistor, and a complementary transistor is preferably connected with the switching transistor to form a two-stage transistor circuit.

Abstract: In a roll film camera defining a film track, and having a film-advance distance, provision is made for any bend in the film due to the rerouting thereof over a film rerouting roll, to be rendered harmless by disposing the film rerouting roll at a predetermined distance along the film track from a film inlet edge of a film gate of the camera; the predetermined distance is about equal to the film-advance distance, plus one half the difference between the spacing of the film inlet and outlet edges of the film gate.

Abstract: A position indicator is arranged for detecting and indicating the position of a member that is movable along a predetermined path in discrete steps as part of the diaphragm of a still camera. Elements that can produce an electrostatic field and can scan an electrostatic field are alternatively arranged so that a single one of the elements moves with the diaphragm member along a path past a plurality of the other elements positioned along the path. The scanning elements are arranged to operate a switch that can be switched with practically no consumption of power in response to the position of the member, and the switch is arranged to energize at least one indicating element. The electrostatic-field is preferably produced by an electret, the scanning element is preferably an electrode, and the switch is preferably an MOS field-effect transistor.

Abstract: A sub-miniature photographic camera with a housing elongated in a direction transverse to the optical axis, and having a lens window opening and a viewfinder window opening in the front edge of the housing, spaced from each other in the direction of elongation of the housing. A cover plate or blind plate is slidable within the housing from a position closing both openings to a position uncovering both openings. A manually operable member slidable on the housing in a direction transverse to the optical axis serves simultaneously to initiate movement of the cover plate to an open position, and to wind the film, and to tension or cock the shutter operating mechanism ready for making an exposure.

Abstract: A glow lamp for indicating charged readiness of a flash apparatus is provided with a predetermined burning voltage corresponding to a specific charge voltage of the storage capacitor for the flash circuit, and the ignition voltage for the glow lamp is applied as periodic ignition pulses derived from voltage pulses occurring on periodic switching of the converter. The result is a more accurate response of the glow lamp to the desired charge value of the storage capacitor than is obtained by using the ignition voltage of the glow lamp as a threshold value.

Abstract: A projector adjustable in height includes a housing formed with a longitudinal slit at one side thereof, which slit is transverse to the axis of projection of the projector, a handle which has an axis of rotation transverse to the projection axis and to the slit, and which penetrates the housing at least partially. The handle projects from the lower portion of the housing through the slit, and may be pivoted about a point within the housing to a selected position in a direction transverse to the direction of the axle, as well as be rotated about the axis. A clamping device is substantially disposed about the housing point for clamping the handle at a selected position.

Abstract: The invention relates to a photographic enlarger having an exchangeable film trap disposed in a projection head for receiving film, a magnifying lens disposed on one side of the film trap, and an insert member including a light deflection mirror and a condenser abutting the film trap; the insert member is disposed on the other side of the film trap.

Abstract: A double slide projector having two slide projection assemblies, a common magazine for slides, and a common slide changer, uses a motion transmitting arrangement from a drive to the changer so that the changer is moved a full stroke for moving slides from the magazine to the more remote projection assembly and the changer motion is blocked at a partial stroke for movement of slides from the magazine to the nearer projection assembly. A drive provides sufficient movement to move the changer for a full stroke for each actuation, and a slip clutch is arranged in the motion transmitting device so that the changer can move alternately between a full-stroke and a blocked or partial-stroke position. A double-track cam is preferred for the drive, and an arrangement of levers connected through the slip clutch is preferred for transmitting motion from the cam to the gripper portion of the slide changer.

Abstract: A still projector having a closure plate covering a housing aperture providing access to a projection lamp has a storage chamber within the housing positioned to be covered by the closure plate when the closure plate closes the aperture and to be accessible when the closure plate is removed from the aperture. The storage chamber is shaped to receive and store a spare projection lamp and preferably also a lamp changing tool. The closure plate is preferably a slide plate fitting flush with an exterior surface of the housing and extending over a cooling fan and its drive motor. The closure plate prefereably has air passage slots located over the fan, and the storage chamber is preferably formed as a depression in the projector housing over the drive motor.

Abstract: An automatic electronic flash device or computer flash device for cameras. The device includes besides an electronic flash lamp a capacitor capable of being discharged through the flash lamp. Also there is a light sensitive sensor and a device for extinguishing the flash lamp in response to the light falling upon the sensor. There are also provided two signal lamps, one for indicating whether the capacitor is charged, and the other one for indicating that the flash lamp has been discharged. A housing which can be separated from the flash device contains the sensor. The housing is capable of being secured to a camera and both signal lamps are visibly arranged at the rear surface of the sensor housing.