Manipulatable teaching aid

• US 3,117,384 A
• Filed: 03/14/1962
• Issued: 01/14/1964
• Est. Priority Date: 03/14/1962
• Status: Expired due to Term

• Current Assignee: Roman F. Billis
• Original Assignee: Roman F. Billis
• Inventors: Billis, Roman F.
• Application Number:
  US04/179,585
• Time in Patent Office: 671 Days
• US Class Current: 434/208
• CPC Class Codes: G09B 19/02 Counting; Calculating abacus G06C1/00
• CPC Class Codes: Y10S 273/02 Styrene
• CPC Class Codes: Y10S 273/30 Hooked pile fabric fastener
• CPC Class Codes: Y10S 446/901 Detachably adhesive
• CPC Class Codes: Y10T 428/24017 Hook or barb

Claims

1. AN ARTICLE FOR TEACHING ARITHEMETIC COMPRISING A SOLID OF SUBSTANTIALLY SPHERICAL SHAPE DIVIDED INTO SEPARABLE PORTIONS HAVING CONFRONTING PLANAR SURFACES IN CLOSE JUXTAPOSITION WHEN ASSEMBLED TO FORM SAID SHAPE, SAID SURFACES HAVING SHEET MATERIAL AFFIXED THEREON FOR RELEASABLY HOLDING SAID PORTIONS IN SECURE COOPERATING RELATIONSHIP WHEN ASSEMBLED TO FORM SAID SOLID, SAID MATERIAL COMPRISING A PLURALITY OF MINUTE HOOKS AND LOOPS ADAPTED TO OPERATIVELY ENGAGE EACH OTHER AND REMAIN THUS ENGAGED UNTIL SEPARATED BY SUBSTANTIAL EXTERNAL FORCE APPLIED TO SAID PORTIONS, SAID SEPARABLE PORTIONS BEING DEFINED BY AT LEAST ONE PLANE OF SEPARATION PASSING THROUGH THE GEOMETRIC CENTER OF SAID SOLID, AND AN INDENTED AREA IN THE EXTERNAL SURFACE OF SAID SOLID, SAID PLANE PASSING THROUGH SAID AREA SO THAT GENERALLY OPPOSING FORCES APPLIED TO SAID AREA IN A DIRECTION GENERALLY AWAY FROM SAID PLANE AND ON OPPOSITE SIDES THEREOF CAUSE SEPARATION OF SAID PORTIONS FROM EACH OTHER WHEREBY SAID SOLID IS DISASSEMBLED.