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US 3,967,084 AGranted
Keyboard switch assemblies having two foot support legs on dome-shaped contact member
AssigneeKB Denver, Inc.
InventorWalter R. Pounds
Life of this patent
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AssigneeKB Denver, Inc.
InventorWalter R. Pounds
Estimating the term…
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.
In a keyboard assembly which includes an insulative substrate upon which are carried a plurality of conductive paths respective portions of which are selectively bridged upon depression of a conductive resilient contact element, the improvement comprising:
In a keyboard assembly which includes an insulative substrate upon which are carried a plurality of conductive paths respective portions of which are selectively bridged upon depression of a conductive resilient contact element, the improvement comprising:
In a keyboard assembly for use with a plurality of pushbuttons and which includes an insulative substrate upon which are carried a plurality of conductive paths respective portions of which are selectively bridged upon depression of a conductive resilient contact element by a respective one of said pushbuttons, the improvement comprising:
In a keyboard assembly which includes an insulative substrate upon which are carried a plurality of conductive paths respective portions of which are selectively bridged upon depression of a conductive resilient contact element, the improvement comprising:
In a keyboard assembly which includes an insulative substrate upon which are carried a plurality of conductive paths respective portions of which are selectively bridged upon depression of a conductive resilient contact element, the improvement comprising:
Dependencies are inferred from the claim text.