Optics: image projectors – Housing
Patent
1993-11-17
1994-12-20
Cuchlinski, Jr., William A.
Optics: image projectors
Housing
353DIG3, G03B 2130
Patent
active
053749693
ABSTRACT:
A portable overhead projector comprising a rigid housing, a collapsible expansion housing, a fold mirror, a fresnel lens, a light source and a projecting head assembly. In the portable configuration of the projector, all of the operational elements of the projector are collapsed into the confines of the rigid housing. The expansion housing is a box-like assembly having two fixed and two hinged sidewalls. The first and second sidewalls are integrally formed with a bottom wall of the expansion housing. The bottom edges of the third and fourth sidewalls are attached via hinges to opposite marginal edges of the bottom wall. The top edges of the third and fourth walls are attached to the underside of the rigid housing by two hinges. The fold mirror is mounted via a hinge to the inner surface of the bottom wall. The projection head assembly which includes a projecting lens and a projection mirror is attached to the rigid housing by a post, a rack and pinion gear mechanism and a mounting arm. The post is rotatable between a stowed position in which the entire projection head assembly is received inside the rigid housing, and an operational position in which the post is in a generally upward and perpendicular direction from the fresnel lens.
REFERENCES:
patent: 3126786 (1984-03-01), Appeldorn
patent: 3167998 (1965-02-01), Appledorn
patent: 3366005 (1968-01-01), Benedict
patent: 4089599 (1978-05-01), Kuboshima
patent: 4449800 (1984-05-01), DeLougis et al.
patent: 4968134 (1990-11-01), Shimizu et al.
Kyhl David H.
Kyhl Henry C.
Buhl Industries, Inc.
Cuchlinski Jr. William A.
Dowling William C.
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