Quincunx with a rearwardly movable ball-stop

Details Quincunx with a rearwardly movable ball-stop Quincunx with a rearwardly movable ball-stop

1990-06-04

1991-11-19

Apley, Richard J.

Education and demonstration

Mathematics

273109, G09B 100

Patent

active

050662333

ABSTRACT:
A Quincunx type of statistics training device having an improved ball-stop apparatus. The ball-stop comprises a base member having a plurality of forwardly extending pins. The base member is spring biased in a rearward direction and a latch mechanism is used to lock the base member in a forward position. Moving of the latch member allows the ball-stop to move rearwardly and thereby release any balls which had stacked up atop its pins.

REFERENCES:
patent: 3677547 (1972-07-01), Hicks
patent: 4900255 (1990-02-01), Laghi

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