Electricity: magnetically operated switches – magnets – and electr – Permanent magnet-actuated switches
Patent
1979-03-05
1980-10-07
Harris, George
Electricity: magnetically operated switches, magnets, and electr
Permanent magnet-actuated switches
340365L, 200159R, 335206, H01H 900
Patent
active
042271630
ABSTRACT:
A low profile keyswitch for electrical keyboards is disclosed which has the capability of being operated either as a contactless analog type of keyswitch, or as a mechanical contact type of keyswitch. The keyswitch may include a pair of normally-closed contacts that are opened when a separator bar that is integrally formed in the interior of the plunger passes between the contacts as the plunger is depressed. Alternately, a permanent magnet may be carried on one side of the plunger to control the magnetic saturation state of a closed-loop magnetic core which, along with a pair of U-shaped conductive lines that thread through the core, is inserted into a retaining well formed by a pair of walls that project upwardly from a horizontal surface of the base at a location adjacent the side of the plunger that carries the magnet.
REFERENCES:
patent: 3638221 (1972-01-01), Bernin
patent: 3902032 (1975-08-01), Koepke
patent: 3978474 (1976-08-01), Engstrom
patent: 4017850 (1977-04-01), Wanatowicz
patent: 4028696 (1977-06-01), Maoland et al.
patent: 4099176 (1978-07-01), Bernin et al.
MPS Pushbutton Switches, Centralab, Electronic Division Globe-Union Inc., Fort Dodge, Iowa.
New Low-Profile Solid State Keyboards, Micro Switch, Freeport, IL.
Beart Robert W.
Bowen Glenn W.
Harris George
Illinois Tool Works Inc.
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