U.S. Utility Patent 5,120,923 (US5120923A)

Provided by the ASK Keyboard Patents database

Patent diagrams depicting Alps' Push button switch at rest (left) and pressed (right)
More informaion
NamePush button switch
InventorsTakafumi Kato, Kazutoshi Watanabe
AssigneesAlps
DescriptionAn invention of a keyswitch that uses a click rubber (buckling rubber sleeve) and an S-shaped plastic actuator that can uniformly compress it. This was implemented as Alps KFNR buckling sleeves and was used for the IBM KeyPad III.