Patent · US Expired

Key switch

US4431876A · kind A · utility

2Cited by

4References

20Claims

0Family size

Assignee

Preh, Elektrofeinmechanische Werke Jakob Preh, Nachf. GmbH & Co. · DE

Inventors

Wolfgang Labude · Konstanz, DE
Karl-Heinz Bauer · Graben-Neudorf, DE
Edgar Maisch · Bad Neustadt an der Saale, DE

Key dates

Filing date	May 14, 1981
Grant date	Feb 14, 1984
Priority date	—
Expiry date	May 14, 2001

Classification

Technology area (CPC H)Electricity
CPC primaryH01H13/70
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A key switch comprises a casing, at least one key slide guided in the cas against the force of a spring and at least one J-shaped leaf spring having a long spring arm and a short spring arm connected to the long arm by a curved intermediate part, the leaf spring being clamped to assume a unilateral curvature between two abutments, one fixed and the other moveable, the leaf spring having the free end of its long spring arm supported in a first abutment in the key slide and its curved intermediate part in a second abutment formed in a fixed contact member provided in the casing. For providing a minimum space the leaf spring is mounted parallel to the sliding direction in an elongated recess of the key slide.

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