Ruggedized calculator

Details Ruggedized calculator Ruggedized calculator

1986-09-30

1987-10-27

Fuller, Benjamin R.

Registers

Miscellaneous

Numeral wheels

200301, 2003021, 206523, 206592, 206811, G06C 502

Patent

active

047031611

ABSTRACT:
This invention provides a ruggedized calculator having shock-absorbant layers around a relatively unbreakable hard plastic case. Flotation cells enable this unit to float and various seals render it dust-proof and water-tight. Power can be selectively supplied from a solar unit or rechargeable batteries. The keypads are large so they can be manipulated with gloves on and membrane switches prevent dirt, dust, and moisture from reaching the electronics package.

REFERENCES:
patent: 3769741 (1975-11-01), Hessler et al.
patent: 4295179 (1981-10-01), Read
patent: 4567354 (1986-01-01), Sekive
patent: 4573573 (1986-03-01), Favaro

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