In the early 1880s, the young Portugal journalist António Júlio Rodrigues de Azevedo Coutinho (1860-1918) devised an interesting key adding device, which he patented in Brasil in 1882, and later in Great Britain (patent Nr. 188410781, 30 July 1884), and Germany (patent №30421, 19 August 1884).
The adding machine of d’Azevedo has a simple and reliable construction, but never went in production and remained only on paper.
Let’s examine the mechanism of the device, using the patent drawing.
By depressing a key (marked with a in the lower drawings) the underlying wheel b is rotated. The wheels b have different number of teeth, according to the key (e.g. the wheel for 1 key has 1 tooth, that for 2 key has 2 teeth, etc.) The keys are returned in the initial position by means of springs.
The movement from the wheels b will be transmitted to the 10-teeth wheels d, mounted on the tetragonal axis g. Then, by means of the permanently engaged ratchet wheels f1 and f2, the movement will be transferred to the result mechanism (axis g (which is held in the proper position by a spring), and the result wheels i).
The tens carry mechanism is implemented by means of the wheels j, mounted on the axis k. Fixing of the wheels in the position is done by means of springs.
The zeroing of the mechanism is done by turning the knob l (in the left side of the box).
Biography of Azevedo Coutinho
António Júlio Rodrigues de Azevedo Coutinho was born on 11 July 1860, in Quinta de Bouçó, parish of Fontarcada (Póvoa de Lanhoso), northern Portugal. His father João Antonio Rodrigues de Azevedo Coutinho was a local farmer and vine producer, but he was an educated man and even has a religious book published in 1889.
Until the end of 1880s António de Azevedo Coutinho lived in Póvoa de Lanhoso, where he worked as a journalist, writer, and a founder, actor and script-writer of a dramatic group. In 1890 he relocated to the nearby Braga, where he was editor of several newspapers, writer and editor of books. Several years later he relocated to Porto, where he worked for insurance companies.
António de Azevedo Coutinho died in Porto on 7 September 1918.