Typewriting machines – Key-board or key lever-actuating mechanism – Key-cap or key-stem structure
Patent
1994-03-23
1995-10-10
Burr, Edgar S.
Typewriting machines
Key-board or key lever-actuating mechanism
Key-cap or key-stem structure
400491, 4004912, 400495, 200 5A, 200345, B41J 512
Patent
active
054565413
ABSTRACT:
An improved key unit of a keyboard comprising a key top, a keyboard plate and a conductive film; the conductive film being mounted beneath the keyboard plate; the keyboard plate has a mounting base comprising a hollow cylinder mounted thereon and the key top being mounted on the mounting base through the hollow cylinder. The key unit further comprises: (1) a lower portion of the key top having a stem extending therefrom; the stem having a blind hole therein and two symmetrical sides, the stem also having two salient blocks mounted on the two symmetrical sides; the mounting base having a mounting socket comprising two symmetrical guide grooves therein; beneath the two guide grooves, the mounting socket further comprising two stop-and-guide grooves being furnished and aligned to the guide grooves, but being slightly deeper than the two guide grooves, respectively; (2) a bottom portion of the stop-and-guide grooves in the mounting socket having a bias flange; and (3) a taper-shaped spring supported on the bias flange which is mounted between the stem and the mounting socket so as to retain the key unit in the stop-and-guide grooves.
REFERENCES:
patent: 4859820 (1989-08-01), Gotfryd et al.
patent: 4939324 (1990-07-01), English et al.
patent: 5120923 (1992-06-01), Kato et al.
patent: 5203448 (1993-04-01), Osada et al.
patent: 5215187 (1993-06-01), Ping-Chieng et al.
Burr Edgar S.
Hendrickson Lynn D.
Liauh W. Wayne
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