Shift lock and position indicating torsion spring activated key

Details Shift lock and position indicating torsion spring activated key Shift lock and position indicating torsion spring activated key

1980-10-23

1982-09-07

Burr, Edgar S.

Typewriting machines

Case-shift mechanism

For locking case-shift mechanism in position

400477, 200153J, 340365P, B41J 520

Patent

active

043481221

ABSTRACT:
This invention relates to a novel shift lock actuation mechanism useful, for example, in keyboard apparatus wherein a key stem supporting a key is shaped to mate with apertures in the keyboard supporting arrangements or as individual switches and as such contains oppositely disposed, inwardly deformable, flanged members for captivating the key stem within the key apertures and further includes a shift lock cam operably associated with a single turn C-shaped torsion spring member, one end of the C-shaped spring engaging key stem while the opposite end of the C-shaped spring is captivated by the cam, effective upon movement of the key stem to move the cam into one or the other of two positions effective to lock the key stem in a desired position so as to block or unblock light from light emitter-receptor apparatus indicating the position of the key.

REFERENCES:
patent: 3235741 (1966-02-01), Plaisance
patent: 3288973 (1966-11-01), Piber
patent: 3375340 (1968-03-01), Wright
patent: 3542988 (1970-11-01), Baldsare
patent: 3818485 (1974-06-01), Harrison et al.
patent: 3824362 (1974-07-01), Bury
patent: 4112277 (1978-09-01), Kleeb
patent: 4188136 (1980-02-01), Bedocs

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