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US 6,676,415 B2Granted
Teaching aid
AssigneeDirect Educational Services Limited
InventorsRoger Walker, Graham Hiskett
Life of this patent
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Abstract
A teaching aid comprises a frame (1), a plurality of elongate rods (2) mounted horizontally in the frame and spaced vertically from each other and a plurality of polyhedral blocks (3) rotatably mounted on each rod. Means are provided to releasably hold each block (3) in at least three discrete rotary positions on its respective rod (2).
Claims5
A teaching aid comprising:
- a frame;
- a plurality of elongate rods mounted horizontally in the frame and spaced vertically from each other;
- and
- a plurality of polyhedral blocks rotatably mounted on each rod;
- wherein
- means are provided to releasably hold each polyhedral block in at least three discrete rotary positions on its respective rod;
- and
- wherein the rods are rotatably mounted in the frame and means are provided on the frame for releasably holding the rods against rotation in a plurality of discrete rotary positions.
5 more elements
Dependencies are inferred from the claim text.