Keyboard switch arrangement and key switch useable therein

Details Keyboard switch arrangement and key switch useable therein Keyboard switch arrangement and key switch useable therein

1977-08-15

1980-11-11

Marcus, Stephen

Electricity: circuit makers and breakers

Liquid contact

Time delay

200 5A, 200295, 200307, 200DIG1, 235145R, 340365C, 361288, H01H 1304, B41J 508, H01H 902

Patent

active

RE0304352

ABSTRACT:
A keyboard switch arrangement mounted on a base plate and having a plurality of key stem holder blocks, each of which protects a key stem from slipping out and has coupling portions of ridges and grooves on the outer side walls coupled in contiguous relation to one another in a manner that one ridge in one block is fitted in one groove of the adjacent block.

REFERENCES:
patent: 2472363 (1949-06-01), Blackinton
patent: 3545122 (1970-12-01), Onanian
patent: 3586806 (1971-06-01), Swisher
patent: 3631472 (1972-01-01), Lincoln
patent: 3659163 (1972-04-01), Borisov et al.
patent: 3663780 (1972-05-01), Golbeck
patent: 3693059 (1972-09-01), Harris
patent: 3696908 (1972-10-01), Gluck et al.
patent: 3705276 (1972-12-01), Seeger, Jr. et al.
patent: 3710209 (1973-01-01), Webb et al.
patent: 3717737 (1973-02-01), Shimojo
patent: 3751612 (1973-08-01), Hansen
patent: 3760243 (1973-09-01), Peroutky
patent: 3763980 (1973-10-01), Stein et al.
patent: 3797630 (1974-03-01), Zilkha

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