Presentation device used in combination with an overhead project

Details Presentation device used in combination with an overhead project Presentation device used in combination with an overhead project

1989-04-25

1990-08-07

Cuchlinski, Jr., William A.

Optics: image projectors

Miscellaneous

G03B 2100

Patent

active

049462741

ABSTRACT:
A presentation device for an overhead projector according to the present invention comprises a panel unit, which includes a liquid crystal panel, and a case for encasing the panel unit. At least one recess is formed in the outer surface of the panel unit which faces downward during use, and a movable leg is rockably mounted in the recess. During the use of the panel unit, the movable leg is caused to project from the recess by the urging force of a torsion coil spring. The case has an opening edge defining an inlet opening through which the panel unit is inserted into the case. The opening edge serves as an operating portion which is adapted to engage the movable leg, thereby rocking the leg against the urging force of the coil spring, so that the leg is housed in the recess, when the panel unit is inserted into the case through the inlet opening.

REFERENCES:
patent: 3642359 (1972-02-01), Kitch
patent: 4846694 (1989-07-01), Erhardt

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