Education and demonstration – Mathematics – Arithmetic
Patent
1981-05-28
1982-10-19
Grieb, William H.
Education and demonstration
Mathematics
Arithmetic
434208, 434345, G09B 1902
Patent
active
043548423
ABSTRACT:
A base member has a plurality of upwardly facing openings for receiving arithmetic value blocks such as addition or subtraction blocks, a first upwardly facing end opening for receiving positive answer blocks and a second upwardly facing opposite end opening for receiving negative answer blocks. A summing rack including transverse gear teeth is slidably mounted in a longitudinal slot in the base member communicating with each of the recesses. One end of the summing rack has an encoded pattern of holes defining the numerical values of possible positive answers; and the other end of the summing rack has a similar series of holes defining the numerical values of possible negative answers. Each of the recesses which receives an arithmetic value block has a sector gear therein which engages the summing rack teeth and moves the rack a proportionate distance when an addition or subtraction block is inserted into the corresponding recess. When one or more addition and/or subtraction blocks are inserted into corresponding recesses in the base member, the gear rack is moved by a distance corresponding to the algebraic sum of the arithmetic values associated with the inserted blocks, so that the hole pattern in the summing rack at the bottom of the corresponding answer block receiving recess is in such a position that only an answer block having an associated arithmetic value equal to said algebraic sum can be inserted therein.
REFERENCES:
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Baldwin Blair F.
Gorgas Donald
Stoddard Deborah
Baldwin, Stoddard & Co.
Grieb William H.
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