Electric sign

An electric sign arranged to afford a readily observable visual indication of a condition of an establishment entrance door provided with a lock having a movable plunger, said sign comprising visual means adapted to indicate a certain condition of the door of the establishment, means for energizing said visual means, control means actuated in coordination with locking and unlocking of the establishment door lock for controlling said means for energizing said visual means, said control means comprising a first pair of fixed contacts, a movable contact biased toward engagement with said first pair of fixed contacts and arranged to engage and to disengage said first pair of fixed contacts thereby to energize and to deenergize a part of said visual means, a first permanent magnet secured to said movable contact, a second permanent magnet spaced from said first permanent magnet, said permanent magnets being disposed on opposite sides of said movable plunger when said plunger is disposed in locked position so that said plunger effectively isolates said permanent magnets from each other and prevents movement of said movable contact out of engagement with said first pair of fixed contacts so as to maintain energization of a part of said visual means thereby to indicate one condition of the establishment door, said second permanent magnet being effective to attract said first permanent magnet so as to move said movable contact out of engagement with said first pair of fixed contacts and to deenergize said part of said visual means when said plunger is moved to its unlocked position and out of its position between said permanent magnets, and a second pair of fixed contacts engageable by said movable contact in response to unlocking movement of said plunger so as to energize another part of said visual means to indicate another condition of the establishment door.