Key element for a contactless keyboard

Details Key element for a contactless keyboard Key element for a contactless keyboard

1983-04-14

1988-12-13

Recla, Henry J.

Electricity: circuit makers and breakers

Liquid contact

Time delay

200 5R, 200340, 338 32H, H01H 900

Patent

active

047912570

ABSTRACT:
In order to have a large flexibility of application with simultaneously a reasonable number of different piece parts for a so called transformer keyboard the key element is subdivided. A base (1) usable for all applications includes elements for the protection against rotation (14) and for fixing (13) it on a printed circuit board (6) without screws and without soldering operations, further elements to guide (18) the stem (2) and to limit its stroke. The stem receives a ferromagnetic core (4) within its guidance (21). The shape and the size of wall portions (2', 22) change in accordance with the desired raster of the keyboard wherein the key element is used. A cap (3) carrying the marking has the same shape for all stems and is connected to the stem in a detatchable manner (27, 33). Due to their small height these key elements are especially suited in applications for data terminal keyboards with an ergonomically good design.

REFERENCES:
patent: 3826884 (1974-07-01), Lewandowski
patent: 3855439 (1974-12-01), Hermann
patent: 3858145 (1974-12-01), Sulich et al.
patent: 4227163 (1980-10-01), Barnoski
patent: 4251703 (1981-02-01), Hoeft et al.
patent: 4268814 (1981-05-01), Henrion et al.
IBM Tech. Disc. Bull., vol. 3, No. 6, 11-60, Key Top, Eastwood.

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