Reconfigurable photo-electric keyboard having removable keys

Details Reconfigurable photo-electric keyboard having removable keys Reconfigurable photo-electric keyboard having removable keys

1979-09-14

1981-09-29

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

G01D 534

Patent

active

042925150

ABSTRACT:
The invention relates to a reconfigurable photo-optical keyboard having removable keys. The keystem of each key is shaped to the key apertures in the keyboard housing. At least one of the sidewalls of the keystem has one or more flexible fingers which have terminal ends at the bottom of the key. There are retainer flanges at the terminal ends. The retainer flanges lock beneath the bottom surface of the optical keyboard when the key is inserted. The flexible fingers are resilient enough to allow the flanges to release and the keys to be removed from the apertures with a strong pulling pressure. Thus, additional keys can be incorporated into an existing keyboard or unused keys removed.

REFERENCES:
patent: 3787837 (1974-01-01), Allen et al.
patent: 4202640 (1980-05-01), Schmidt et al.

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