Optics: image projectors – Film gate
Patent
1977-06-28
1980-02-12
Stephan, Steven L.
Optics: image projectors
Film gate
G03B 148
Patent
active
041881010
ABSTRACT:
A rotatable slide holder adapted for use in slide projectors is disclosed. The slide holder includes first and second spaced members adapted to grip and maintain a slide to be projected in the space therebetween. Spring loaded screws between the first and second members for rotationally fixing the members relative to one another and for biasing the members toward one another. The first and second spaced members are rotationally coupled to the body of the projector so that the members can rotate about an axis perpendicular to a slide positioned in the space between the members. A drive motor is mounted on the projector body and is coupled to the slide maintaining members for causing their rotation. In a first embodiment of the invention one of the spaced members has a circular cross-section and is formed with four uniformly spaced detents in the outer surface thereof. The drive motor switch is a pantograph, one leg joint of which is positioned to cooperate with the detents. Removal of the leg joint from the detent permits rotation of the slide holder and simultaneously activates the drive motor. The reinsertion, after a 90 degree rotation of the slide holder, of the pantagraph joint into a detent rotationally locks the slide holder and deactivates the drive motor. In a second embodiment of the invention one member of the slide holder is a cam wheel and the motor activating switch includes a cam roller. Activation of the drive motor causes the cam wheel to rotate thereby uring the cam roller out of a cam wheel detent. The movement of the cam roller into the following cam wheel detent deactivates the drive motor.
REFERENCES:
patent: 2597449 (1952-05-01), Cassidy et al.
patent: 2953966 (1960-09-01), Leitz et al.
patent: 2960906 (1960-11-01), Fogel
patent: 3881814 (1975-05-01), Madison
patent: 3923390 (1975-12-01), Susko
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