04032729 is referenced by 121 patents and cites 14 patents.

A low profile keyboard switch with tactile feel and short key travel is disclosed. The keyboard may be a matrix connected keyboard and includes a lower, fixed contact and an upper, concave contact. The concave contact is supported at one end and operates as a cantilever beam. When pressure is applied by a key, at the unsupported end to cause buckling of the concave contact at its supported end, electrical contact is made with the lower fixed contact. The concave contacts possess the key return force and the snap action desirable for tactile feel and short key travel for a low-profile, low-cost keyboard switch.

Title
Low profile keyboard switch having panel hinged actuators and cantilevered beam snap acting contacts
Application Number
5/427173
Publication Number
4032729
Application Date
December 21, 1973
Publication Date
June 28, 1977
Inventor
Clayton W Koistinen
La Habra
CA, US
Agent
Roland G Rubalcava
G Donald Weber Jr
H Fredrick Hamann
Assignee
Rockwell International Corporation
CA, US
IPC
G06C 7/02
R41J 5/00
H01H 13/26
View Original Source