Patent · US Expired

Keyboard assembled from individual keys

US4349286A · kind A · utility

9Cited by

6References

1Claims

0Family size

Assignee

Kienzle Apparate GmbH · DE

Inventors

Paul Blaser · Villingen-Schwenningen, DE
Helmut Schmidt · Riegelsberg, DE
Walter Strobel · Unterkirnach, DE

Key dates

Filing date	Feb 21, 1979
Grant date	Sep 14, 1982
Priority date	—
Expiry date	Feb 21, 1999

Classification

Technology area (CPC H)Electricity
CPC primaryH01H2229/022
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A keyboard which can be assembled from individual keys is disclosed. The individual keys include a key button, a key shaft for switching electric circuits, a stationary key body, and a spring for influencing the relative movement between the key shaft and key body. A base structure having cutouts is provided for receiving the keys. A circuit board carrying control elements cooperates with the key arrangement. The key buttons have several receiving openings for the key shafts. The cutouts in the base structure and the arrangement of the control elements on the circuit board are staggered relative to each other from row to row by a half spacing.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.