Variable spring force keyboard pad

Details Variable spring force keyboard pad Variable spring force keyboard pad

1977-12-19

1979-05-22

Ross, Herbert F.

Electricity: circuit makers and breakers

Liquid contact

Time delay

200340, H01H 312

Patent

active

041561201

ABSTRACT:
A keyboard pad having a frame member 2 and at least one key 1 resiliently supported therein, the key being connected to the frame member by at least one spring element 3 for returning the depressed key to its initial position after release. The assembly is moulded in one piece from a castable, resiliently yielding material. Along at least a part of its circumference the key is surrounded by at least one elongated spring element which is rigidly connected to the key at first locations 4,5 situated substantially symmetrically about the center of the key and which is also rigidly connected to the frame member at second locations 6,7 displaced along the circumference of the key relative to the first locations and situated lower or inwardly therefrom, viewed in the depression direction of the key.

REFERENCES:
patent: 3676607 (1972-07-01), Nash et al.
patent: 3742157 (1973-06-01), Leposavic
patent: 3749872 (1973-07-01), Foster
patent: 3829646 (1974-08-01), Lorteije et al.
patent: 4066860 (1978-01-01), Kawasaki

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