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 can be releasably held in a plurality of discrete rotary positions.
A teaching aid as claimed in any preceding claim, wherein each rod is formed with a plurality of grooves extending along its length and wherein each block is provided with means to co-operate with the grooves to hold the block in a selected one of its discrete rotary positions.
Dependencies are inferred from the claim text.