Keyboard switch assemblies having two foot support legs on dome-

Details Keyboard switch assemblies having two foot support legs on dome- Keyboard switch assemblies having two foot support legs on dome-

1975-05-12

1976-06-29

Scott, James R.

Electricity: circuit makers and breakers

Electric switch details

Contact

200 5A, 200159B, 200292, 200302, H01H 106, H01H 1352

Patent

active

039670848

ABSTRACT:
A keyboard assembly includes an insulative substrate upon which are carried a plurality of conductive paths. Respective portions of the paths are selectively bridged upon depression of a dome-shaped conductive resilient contact element. A pair of space-opposed regions of the dome's marginal portion are deformed downwardly away from its apex so as to constitute a pair of space-opposed feet. The feet have a complex shape which leads to high lifetime of the dome. Preferably, the feet rest on corresponding conductive pads, and the pad pairs for adjacent domes may be differently oriented so as better to accommodate the passage of leads between those domes. Leads on the substrate passing beneath dome edges desirably are depressed into the substrate. Overlying the domes in a completed assembly is a layer of deflectable insulating material that is adhesively affixed to the substrate and to the domes; the latter includes an aperture in registry with each dome but of a diameter smaller than the width of such dome. Advantageously, the adhesively-coated layer also is utilized for the purpose of picking up individual domes from a magazine and transferring them to their assigned positions on the substrate.

REFERENCES:
patent: 3749859 (1973-07-01), Webb et al.
patent: 3751612 (1973-08-01), Hansen
patent: 3904813 (1975-09-01), Groff
patent: 3908109 (1975-09-01), Studebaker
patent: R28365 (1975-03-01), Brave

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