Electromagnetic indicator having a rotor disposable in discrete positions
AssigneeThe Staver Company, Inc.
InventorAlfred Skrobisch
Life of this patent
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Abstract
An electromagnetic indicator has a stator carrying a stationary reversibly magnetizable core, and a rotor including a display disk and rotary cylindrical magnet. The magnet is permanently magnetized with two poles each angularly spaced apart less than 180.degree. at one side of a diameter of the magnet which also passes through the radially located core. Stop elements carried by the stator and core are engaged in each stopping position of the rotor when one of the magnet poles is attracted to, but held spaced from the magnetized core. The poles can be located to effect a turning range of the rotor from 120.degree. to 250.degree..
Claims10
An indicator device having two stable positions comprising:
- a stator having a stationary elongated reversable polarity permanent magnet core;
- means for reversing polarity of said permanent magnet core;
- a rotor carried by said stator and having a magnet disposed adjacent to said core, said rotor being turnable angularly on an axis perpendicular to said elongated core from one of said stable positions to the second of said stable positions upon reversing polarity of said permanent magnet core;
- said magnet having two magnetic poles each of which is located on the same side of a diameter of said rotor which diameter passes through said elongated core at each of said stable positions so that reversing polarity of said core will produce reverse turning movements of said magnet;
- and
- stop means carried by said stator and rotor and arranged for selective engagement so that rotation of said rotor is stopped at one of said stable positions in its angular movement where both of said poles are spaced from said core with one of said poles closest to said core attracted magnetically to said core while said stop means prevent rotation and vibratory movements of said rotor.
Dependencies are inferred from the claim text.