Bistable position indicating device

Abstract

A bistable position indicating device comprising a fixed and a movable part, the latter being provided with two portions having different colors and arranged to be switched to one or the other color portion position by means of coaction between a permanent magnet and an electromagnet having mutually setable positions. The movable part comprises an elongate body such as a cylinder, which has its envelope surface axially divided into said two portions of different colors, and is turnably arranged about its central axis. The electromagnet is provided with pole shoes arranged to meet the poles of the permanent magnet, both the magnets being, on the application of a current pulse to the electromagnet coil, through coaction between the fields of the magnet and the coil, turned in relation to each other so that the movable part is turned through an angle less than 180.degree., particularly mainly 180.degree., and is reset from one color position to the other and vice versa.

Dependencies are inferred from the claim text.