Feet, inches and sixteenths adder

Details Feet, inches and sixteenths adder Feet, inches and sixteenths adder

1976-12-16

1978-07-11

Malzahn, David H.

Boots, shoes, and leggings

G06F 750

Patent

active

041006038

ABSTRACT:
An electronic adding machine for adding and subtracting feet, inches, and sixteenths inch has a hexadecimal keyboard with the decimal keys 0-9 contrasting with the six other keys 10-15. Each addened and subtrahend applied to the keyboard is encoded in binary coded hexadecimal (sixteenths and inches) and decimal (feet) and temporarily stored in receiver registers.
Whatever data is in the receiver registers is continually read out by an L.E.D. display. Read out is effected by first converting the inch and sixteenths data to binary coded decimal and thereafter converting all the data from BCD to seven segment L.E.D. signals. Timed blanking of the L.E.D.s saves battery power.
Accumulator registers store the total of all previous entries. When an add or subtract key is actuated, a hexadecimal full adder adds the augend in the accumulator registers and the data in the receiver registers, the result is entered in the accumulator registers, and the receiver registers are cleared to receive more data. If the data component is other than sixteenths, e.g. inches or feet, a correction is made to the result before entering it in the accumulator registers, since the feet are counted in decimal and the inches in duodecimal, and are so stored in the accumulator registers even though binary coded.

REFERENCES:
patent: 3739161 (1973-06-01), Gross et al.
patent: 3973113 (1976-08-01), Goldsamt
patent: 3976867 (1976-08-01), Campbell
patent: 4010359 (1977-03-01), Weber et al.
R. Townsend, "Serial Digital Adders for a Variable Radix of Notation", Electronic Engineering, pp. 410-416 Oct. '53.

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