Lockable key with luminescent display for office typewriters and

Details Lockable key with luminescent display for office typewriters and Lockable key with luminescent display for office typewriters and

1980-08-19

1982-12-28

Crowder, Clifford D.

Typewriting machines

Key-board or key lever-actuating mechanism

Key-cap or key-stem structure

400711, 200314, B41J 512, B41J 2918

Patent

active

043659039

ABSTRACT:
A lockable key for use on electronic keyboards in office typewriters and teleprinters has a receptacle at an upper portion thereof for receiving a light emitting diode which is mounted in a small circuit board which can be snapped into the upper portion of the key and which is supplied current via flexible interlaced wires. A lower portion of the key has a guide element which cooperates with a guide pin carried on a side of the key base for retaining the upper portion of the key in a depressed state after a first actuation thereof, and for allowing return of the upper portion of the key to the original position after a successive actuation thereof.

REFERENCES:
patent: 3866006 (1975-02-01), Westram
patent: 4088855 (1978-05-01), Emery
patent: 4096368 (1978-06-01), Grebner
Western Electric Technical Digest #46 Apr. 1977, "Pushbutton Assembly", J. E. Distler et al. (p. 17).

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