Hansen Writing Ball Patent Model

Description:

This typewriter patent model accompanied the patent application of Hans R. Malling J. Hansen of Copenhagen, Denmark in his patent application that received patent number 125,952 on April 23, 1872. The model only shows a portion of the machine, with three letters in the “type-ball.” This patent was one of the earlier designs of Hansen’s unique writing ball typewriter. In his patent Hansen claimed the combination of converging types arranged circularly that met at the same point. Hansen also claimed the use of a spring or electro-magnet as a means of paper carriage movement. The electromagnet in the typewriter operated by closing the circuit on each descent of the type before it makes it impression on the paper. Closing the circuit causes an attraction of the armature of the magnet, moving the drum before the type hits. After the drum moved a full line, the mechanism would move it down a line.