Elastic pattern abacus and tool for changing arrangement of abac

Details Elastic pattern abacus and tool for changing arrangement of abac Elastic pattern abacus and tool for changing arrangement of abac

1993-11-04

1995-03-07

Mancene, Gene

Education and demonstration

Mathematics

Arithmetic

223 48, 434207, 434203, G06C 100

Patent

active

053952456

ABSTRACT:
The elastic pattern abacus relates to educational counting devices for learning basic number and arithmetic concepts. The present invention introduces a new flexible medium for threading and holding counters (beads or blocks of any shapes) in a sequence, such that: they slide easily, yet are automatically held stably at any desired positions along the sequence. The members of the abacus can be separated, counted, grouped, divided, and regrouped to demonstrate arithmetic concepts and number systems. A tool for changing the arrangement of the abacus beads is also disclosed.

REFERENCES:
patent: 386723 (1888-07-01), Smith
patent: 1293660 (1919-02-01), Armstrong
patent: 2330538 (1943-09-01), Allen
patent: 2529059 (1950-11-01), Tell
patent: 2585781 (1952-02-01), Johnson
patent: 3811205 (1974-05-01), Pitzler
patent: 4210093 (1980-07-01), Baker
patent: 4274565 (1981-06-01), Russell
patent: 4351166 (1982-09-01), Belin

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