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US 2002/0176057 A1Published application
Low profile overhead projector having a foldable post
Assignee3M Innovative Properties Company
InventorsDwight G. Baldwin, James E. Peterson
Life of this patent
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Abstract
The present invention provides overhead having (a) a main body having a stage area, (b) a head assembly, and (c) a post suspending the inverted head assembly over the stage area. The post is pivotally attached to the main body in accordance with equation Clearance={square root}{square root over ((Mx−Px)2+(My−Py)2)}−{square root}{square root over ((Fx−Px)2+(Fy−Py)2)} and the post is outside the stage area. In a preferred embodiment, the head assembly is an inverted head assembly.
Claims11
An overhead projector comprising:
- a) a main body having a stage area;
- b) a inverted head assembly;
- and
- c) a post suspending the inverted head assembly over the stage, wherein the post is pivotally attached to the main body in accordance with equation
- Clearance={square root}{square root over ((Mx−Px)2)}+(My−Py)2−{square root}{square root over ((Fx−Px)2+(Fy−Py)2)}
- and wherein the post is outside the stage area when the projector is in a display mode.
3 more elements
An overhead projector comprising:
- a) a main body having a stage area;
- b) an inverted head assembly;
- c) a post suspending the inverted head assembly over the stage area, wherein the post is pivotally attached to the main body such that the inverted head assembly does not to collide with the main body when pivotally rotated about the main body, and wherein the post is outside the stage area when the overhead projector is in a display mode.
Dependencies are inferred from the claim text.