The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 10, 1976
Filed:
Dec. 17, 1973
Frank J Thomas, Topeka, KS (US);
Other;
Abstract
A rotary calculator is disclosed for use in site grading applications and other surveying operations involving the conversion of rod readings to datum or sea level elevations, the determination of depths of cut or fill required for finish grading, and the calculation of material quantities to be moved. The baseplate of the calculator is provided with an annular rod reading scale, and a circular conversion unit is concentrically mounted on the baseplate within the rod reading scale. The unit employs three annular elevation scales covering the units and tens digits, the hundreds digit, and the thousands digit of elevation respectively, and three independently rotatable, coaxial discs align the elevation scales in a manner to convert rod readings radially aligned with the units and tens scale into corresponding elevations relative to a predetermined reference elevation, such as mean sea level. A top disc member overlies the conversion unit and is provided with an annular depth scale graduated to indicate depth of cut and depth of fill, and with material quantity information arranged in concentric circular arrays radially aligned with corresponding graduations of the depth scale. A pointer is rotatable about the common axis of the assembly and has a radial hairline used in visually aligning the scale readings.