Buckling spring torsional snap actuator
AssigneeInternational Business Machines Corporation
InventorRichard Hunter Harris
Life of this patent
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Abstract
A torsional or rocker switch actuator is described that uses the torsional moment of a buckling compression spring column to rock the actuator member on a pivot. A catastrophically buckling compression column spring is used and the reaction moment which occurs as the spring buckles is applied to rock an actuator back and forth between open and closed positions with cooperating contacts beneath the actuator. A non-teasible, snap action, tactile feedback, key mechanism of extreme mechanical simplicity and high reliability is achieved.
Claims4
In an electrical key actuating mechanism having a key top, a housing having means for slidably receiving said key top for vertical motion thereof, a pivoting rocker type electrical actuating means in said housing opposite said key top, electrical means for actuation by said electrical actuating means, and also having a buckling compression spring means under precompression and mounted between said key top and said pivoting rocker type electrical actuating means, the improvements comprising:
- lateral deflection offset spring mounting means within said housing bearing against said buckling compression spring and displacing the central portion thereof relative to its ends in a first chosen direction for promoting buckling of said buckling compression spring in said first chosen direction;
- mounting means on said key top for pivotally mounting the proximal end of said buckling compression spring;
- and
- mounting means on said rocker for mounting the distal end of said buckling compression spring with an edge of said spring colinear with said pivot of said rocker.
Dependencies are inferred from the claim text.