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US 4,377,850 AGranted
Hand-held measuring and calculating device
OwnerRoy Simpsoninventor
Life of this patent
Estimating the term…
Abstract
A self-contained, hand-held measuring device utilizing a roller mounted on a miniature electronic calculator to actuate the "constant" integrating circuit as the roller rolls along a surface to be measured. The calculator keyboard is usable to make and display various calculations using the results of measured distances, as well as for calculating purposes generally.
Claims8
A self-contained hand-held measuring and calculating device comprising:
- a housing rotatably supporting roller means positioned for and driven by rolling contact with a surface to be measured;
- miniature electronic calculator means mounted in said housing provided with digital readout display means and connected to a constant value integrating circuit controlled by an activating switch operable to close said circuit on each operation of said switch;
- and
- non-electrical mechanical camming means on said roller means operable to actuate said switch each time said roller means rotates through an equal value increment in the same direction and thereby effective to display on said display means the aggregate number of increments of rotation of said roller means over a surface undergoing measurement.
1 more element
Dependencies are inferred from the claim text.