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US 4,703,161 AGranted
Ruggedized calculator
OwnerRoger D. McLeaninventor
Life of this patent
Estimating the term…
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.
Claims10
An improved calculator comprising:
- electronic circuit means including a plurality of conventional keypad switchs;
- a digital readout displaym eans;
- a carrier frame for operatively housing said digital read out display means and said electronic circuit means including said keypad switches;
- means for covering the rear of said frame, said covering means including means for enabling said calculator to float;
- means for housing a source of potential in said frame for operating said electronic circuit means;
- means for covering the front of said frame with a face panel having apertures for said keypad switches and said digital display means;
- an outer casing including a rear panel, a pair of side panels, and a front access panel, each of said panels including a relatively thick layer of foam means attached to an exterior layer of relatively unbreakable plastic casing material;
- said front access panel being hingedly secured to one of said side panels for selectively opening and closing access to said keypad switches and digital display means of said calculator.
5 more elements
An improved calculator comprising:
- electronic circuit means including a plurality of conventional keypad switches;
- a digital read out display means;
- a carrier frame for operatively housing said digital read out display means and said electronic circuit means including said keypad switches;
- means carried by said carrier frame for enabling said calculator to float;
- means for housing a source of potential in said frame for operating said electronic circuit means;
- means for covering the front of said frame with a face panel having apertures for said keypad switches and said digital display means;
- an outer casing including at least a rear panel and a front access panel, each of said panels including an exterior layer of relatively unbreakable plastic casing material;
- said front access panel being hingedly secured to said rear panel for selectively opening and closing access to said keypad switches and digital display means of said calculator, wherein with said front access panel closed, said calculator is protected against damage.
5 more elements
Dependencies are inferred from the claim text.