Title: Educational device

Abstract: An improved educational device comprises a hand held paddle-shaped device having a windowed front plate, a back plate, and rotatably interposed therebetween two circular disks, a first disk for displaying problem and solution indicia through the windowed front plate and a second disk for temporarily masking the display of the solution indicia. Tabs on the two disks permit both clockwise and counterclockwise rotation of the disks to a problem indicia displaying position. Subsequently, under the control of the operator of the improved educational device, the masking disk is rotated relative to the displaying disk, either manually as in one embodiment of the invention or automatically by a spring or other like means as in alternate embodiments to permit the display of both problem and solution indicia. As preferred, the display disk may be made easily interchangeable with other displaying disks having differing problem and solution indicia.

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Other info:

Inventors: Saint, David

Application Number: 698350
Filing Date: 1976-06-22
Publication_date: 1977-05-10
Assignee:
Primary Class(es): 434/348 434/198
Other Classes:
US Patent Ref:

1438144	Dec, 1922	Stevenson	35/31.
1728584	Sep, 1929	Wright	35/31.
2797499	Jul, 1957	Lagerdahl	35/31.
3523376	Aug, 1970	Gilliam et al.	35/31.
3732632	May, 1973	Dyer	35/31.
3928922	Dec, 1975	Rosenbaum	35/31.

Other Refs:
Primary Examiner: Skogquist, Harland S.
Assistant Examiner:
Attorney: Brenner; Leonard C.