Contactless device for feeding switching commands - pencil-shaped element for feeding commands into electronic unit

摘要

At least one hole is drilled in the unit front plate, behind which coaxial inductance coil(s) are provided. A permanent magnet is placed in the pencil together with a drive which propels it at high speed through the hole into the coil, or moves it out. The drive consists of a helical spring connected to the magnet, and a locking and release device. The circular inductance coil (3) is fitted on the inner side of the front plate (1) to receive the command signal. The hand piece (4) contains a bar magnet (5) which can move rapidly within the inductance coil (3) to induce an electric current.