Educational building toy

Education and demonstration – Mathematics – Arithmetic

Patent

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Details

446103, 446107, 273292, G09B 140, A63H 3308, A63F 920

Patent

active

045471606

ABSTRACT:
An educational and building toy including a set of blocks of different lengths, having spaced-apart holes the number of which is determined by the proportional length of the block relative to a unit length. A plurality of discs and wafers are also provided, having holes and also indicia opposed thereon for the arithmetical operations of addition, subtraction, multiplication and division, and the cardinal numerals from one to ten, respectively. A plurality of flexible rods having axially-extending and circumferentially spaced ridges are provided. The peaks of the ridges define an outer diameter slightly larger than the diameter of holes in the blocks, discs and wafers, whereby a friction fit is obtained between the rods and perforated pieces to build different objects. The discs have a peripheral flange and a hub. The flange of some of the discs has inner gear teeth for meshing with the rod ridges. The hub hole of some of the discs have indentations for making a spline connection with the rod ridges.

REFERENCES:
patent: 615818 (1898-12-01), Dexter
patent: 1428206 (1922-09-01), Benton
patent: 1701190 (1929-02-01), Paulson
patent: 3094792 (1963-06-01), Morgan et al.
patent: 3229388 (1966-01-01), Smith
patent: 3452454 (1967-02-01), Easton
patent: 3672681 (1972-06-01), Wolf
patent: 3987579 (1976-10-01), Palenik, III

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