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US 4,492,829 AGranted
Tactile membrane keyboard with asymmetrical tactile key elements
AssigneeRogers Corporation
InventorLeo J. Rodrique
Life of this patent
Estimating the term…
Abstract
A tactile or snap action membrane keyboard is presented wherein the tactile or snap action key elements are protrusions in a membrane sheet, the protrusions being asymmetrical to preprogram the collapse of the tactile element.
Claims26
A tactile snap action switch element comprising:
- a sheet of base material;
- and
- at least one snap action protrusion having a first wall segment and a second wall segment formed in said sheet of base material, said protrusions being asymmetric with respect to a center axis thereof or a plane containing said center axis.
A keyboard comprising:
- a sheet of base material;
- a plurality of tactile elments formed in said sheet of base material, each of said tactile elements being a protrusion in said base material, each of said protrusions having a first wall segment and a second wall segment, said protrusions being asymmetric with respect to a center axis thereof or a plane containing said center axis;
- first electrically conductive means associated with each tactile element;
- and
- second electrically conductive means aligned with each of said tactile elements, said first electrically conductive means contacting said second electrically conductive means to complete an electric circuit upon actuation of each of said tactile elements.
2 more elements
A tactile snap action switch element comprising:
- a sheet of base material;
- and
- at least one snap action protrusion formed in said sheet of base material, said protrusion having a first wall section which is part of a surface of revolution about an axis and a second wall section which is other than a surface of revolution about said axis, whereby said protrusion is asymmetric with respect to said axis or a plane containing said axis.
A keyboard comprising:
- a sheet of base material;
- a plurality of tactile elements formed in said sheet of base material, each of said tactile elements being a protrusion in said base material, said protrusion having a first wall section which is part of a surface of revolution about an axis and a second wall section which is other than a surface of revolution about said axis, whereby said protrusion is asymmetric with respect to said axis or a plane containing said axis;
- first electrically conductive means associated with each tactile element;
- and
- second electrically conductive means aligned with each of said tactile elements, said first electrically conductive means contacting said second electrically conductive means to complete an electric circuit upon actuation of each of said tactile elements.
2 more elements
Dependencies are inferred from the claim text.